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WO2020181431A1 - Procédés et appareil permettant de transmettre et de recevoir une réponse d'accès aléatoire, et système - Google Patents

Procédés et appareil permettant de transmettre et de recevoir une réponse d'accès aléatoire, et système Download PDF

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Publication number
WO2020181431A1
WO2020181431A1 PCT/CN2019/077542 CN2019077542W WO2020181431A1 WO 2020181431 A1 WO2020181431 A1 WO 2020181431A1 CN 2019077542 W CN2019077542 W CN 2019077542W WO 2020181431 A1 WO2020181431 A1 WO 2020181431A1
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Prior art keywords
random access
access response
indication information
terminal device
pdcch
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English (en)
Chinese (zh)
Inventor
路杨
王昕�
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Fujitsu Ltd
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Fujitsu Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of communications, and in particular to a method, device and system for sending and receiving random access responses.
  • the connection density of the massive machine type communication (mMTC) scenario needs to reach 1 million terminal devices/square kilometer, which is ultra-high and reliable.
  • the delay of the ultra-low delay service in URLLC needs to be less than 1ms.
  • the mMTC scenario requires a low-cost, low-signaling overhead, low-latency, and low-power communication system, because a large number of uplink small data packet bursts generated by massive machine-type communication terminal equipment need to pass random
  • the access is sent to the network, and if it is based on the traditional 4-step random access (4-step RA) method and orthogonal multiple access technology, the air interface signaling overhead and transmission delay are relatively large; similarly, the business of the uRLLC scenario is mainly It is a periodic or event-triggered small data packet, and random access is used to send uplink data with a high probability.
  • the existing 4-step random access method cannot meet the requirements of low signaling overhead and low delay.
  • V2V vehicle-to-vehicle communication
  • eMBB enhanced mobile broadband
  • WiFi wireless fidelity
  • LBT listen before talk
  • 2-step random access (2-step RA) method and non-orthogonal multiple access technology are general solutions for reducing random access signaling overhead and delay, which can eliminate the uplink scheduling process during random access , Especially for small data packets and unlicensed frequency band services, there are obvious efficiency improvements. It can meet the needs of low cost, low power consumption, and massive small data packets in the application scenarios of massive large connection mMTC in the future, and meet the low latency and low power of frequent small data packets and random burst services in eMBB, uRLLC, V2V and other application scenarios Consumption requirements are generally applicable to random access to unlicensed spectrum and licensed spectrum.
  • MsgB 2-step RA random access response
  • a 4-step RA random access response (Msg2) may be received from the network device. Therefore, the terminal device may not be able to distinguish whether the received random access response is MsgB or Msg2, and thus cannot perform subsequent random access procedures.
  • the above-mentioned problems may also exist for terminal devices that initiate 4-step RA.
  • the MsgA data sent by the terminal device may contain different content. According to the content of the MsgA data, the network device will send random access information containing different contention resolution information to the terminal device. Incoming response (MsgB), but the terminal device cannot recognize different MsgB, so it cannot correctly resolve the contention.
  • embodiments of the present invention provide a method, device and system for sending and receiving a random access response.
  • a method for sending a random access response which is applied to a network device, wherein the method includes:
  • the random access response indication information indicates that the random access response is the first random access response or the second random access response, the The first random access response at least carries the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution information for the data of the first message.
  • a method for receiving a random access response which is applied to a terminal device, wherein the method includes:
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution information for the data of the first message.
  • an apparatus for sending a random access response which is configured in a network device, wherein the apparatus includes:
  • a receiving unit which receives a first message sent by a terminal device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • a sending unit which sends random access response indication information and a random access response to the terminal device; the random access response indication information indicates that the random access response is the first random access response or the second random access
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution for the data of the first message information.
  • a random access response receiving apparatus which is configured in a terminal device, wherein the apparatus includes:
  • a sending unit which sends a first message to the network device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • a receiving unit which receives the random access response and random access response indication information sent by the network device, and determines whether the random access response is the first random access response or the second random access response according to the random access response indication information Access response; the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first data for the first message Competition resolution information.
  • a method for sending a random access response which is applied to a network device, wherein the method includes:
  • the random access response indication information indicates that the random access response is the second random access response or the third random access response
  • the The second random access response carries at least first contention resolution information for the data of the first message
  • the third random access response carries at least second contention resolution information for the data of the first message.
  • a method for receiving a random access response which is applied to a terminal device, wherein the method includes:
  • the second random access response carries at least first contention resolution information for the data of the first message
  • the third random access response carries at least second contention resolution information for the data of the first message.
  • a random access response sending device which is configured in a network device, wherein the device includes:
  • a receiving unit which receives a first message sent by a terminal device, the first message including a random access preamble and data;
  • a sending unit which sends random access response indication information and a random access response to the terminal device; the random access response indication information indicates that the random access response is a second random access response or a third random access
  • the second random access response carries at least the first contention resolution information for the data of the first message
  • the third random access response carries at least the second contention resolution information for the data of the first message information.
  • a random access response receiving apparatus which is configured in a terminal device, wherein the apparatus includes:
  • a sending unit that sends a first message to the network device, where the first message includes a random access preamble and data;
  • a receiving unit which receives random access response and random access response indication information sent by the network device
  • a determining unit which determines, according to the random access response indication information, that the random access response is a second random access response or a third random access response; the second random access response carries at least information specific to the first random access response; The first contention resolution information of the data of the message, and the third random access response carries at least second contention resolution information for the data of the first message.
  • a network device wherein the network device includes the device described in the foregoing third aspect or seventh aspect.
  • a terminal device wherein the terminal device includes the device described in the foregoing fourth aspect or the eighth aspect.
  • a communication system includes the network device described in the aforementioned ninth aspect and the terminal device described in the aforementioned tenth aspect.
  • a computer-readable program is provided, wherein when the program is executed in a network device, the program causes a computer to execute the aforementioned first aspect or fifth aspect in the network device The method described.
  • a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method described in the first aspect or the fifth aspect in a network device.
  • a computer-readable program is provided, wherein when the program is executed in a terminal device, the program causes the computer to execute the aforementioned second aspect or sixth aspect in the terminal device. The method described.
  • a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method described in the foregoing second aspect or sixth aspect in a terminal device.
  • the network device indicates the type of random access response to the terminal device It is used for the terminal device to distinguish whether the received random access response is the MsgB of 2-step RA or the Msg2 of 4-step RA, so as to correctly execute the subsequent random access process.
  • the network device indicates the type of the random access response to the terminal device for the terminal device to distinguish that the received random access response contains The contention resolution information can be used to correctly perform the subsequent random access process.
  • Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of a 4-step random access method
  • Figure 3 is a schematic diagram of a 2-step random access method
  • Figure 4 is a schematic diagram of a fallback from 2-step random access to 4-step random access
  • FIG. 5 is a schematic diagram of a method for sending a random access response in Embodiment 1;
  • Figure 6 is a schematic diagram of a random access response transmission block
  • FIG. 7 is a schematic diagram of the format of the MAC subPDU including the random access response indication MAC CE;
  • Figure 8 is another schematic diagram of a random access response transmission block
  • Figure 9 is a schematic diagram of the first random access response
  • Figure 10 is a schematic diagram of a second random access response
  • Figure 11 is another schematic diagram of a random access response transmission block
  • FIG. 12 is a schematic diagram of the format of the subheader of the random access response MAC subPDU
  • Figure 13 is another schematic diagram of a random access response transmission block
  • FIG. 14 is a schematic diagram of the format of the MAC subPDU subheader of the random access response indication MAC CE;
  • FIG. 15 is another schematic diagram of the first random access response
  • FIG. 16 is another schematic diagram of the second random access response
  • Figure 17 is a schematic diagram of the third random access response
  • 18 is a schematic diagram of the format of the subheader of the MAC SubPDU of the random access response
  • FIG. 19 is a schematic diagram of the random access response receiving method of Embodiment 2.
  • FIG. 20 is a schematic diagram of a method for sending a random access response in Embodiment 3;
  • FIG. 21 is a schematic diagram of a method for receiving a random access response in Embodiment 4.
  • FIG. 22 is a schematic diagram of a random access response sending apparatus of Embodiment 5.
  • FIG. 23 is a schematic diagram of a random access response receiving apparatus of Embodiment 6;
  • FIG. 24 is a schematic diagram of a random access response sending device of Embodiment 7.
  • FIG. 25 is a schematic diagram of a random access response receiving apparatus of Embodiment 8.
  • FIG. 26 is a schematic diagram of a network device of Embodiment 9;
  • FIG. 27 is a schematic diagram of a terminal device of Embodiment 10.
  • the terms “first”, “second”, etc. are used to distinguish different elements in terms of numelations, but they do not indicate the spatial arrangement or temporal order of these elements. These elements should not be used by these terms. Limited.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having” and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • the term "communication network” or “wireless communication network” can refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), and Enhanced Long Term Evolution (LTE-A, LTE-A). Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-A
  • LTE-A LTE-A
  • Advanced Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • High-Speed Packet Access High-Speed Packet Access
  • HSPA High-Speed Packet Access
  • the communication between devices in the communication system can be carried out according to any stage of communication protocol, for example, it can include but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, New Radio (NR, New Radio), etc., and/or other currently known or future communication protocols.
  • Network device refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • Network equipment may include but is not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.
  • the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., and may also include remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low-power node (such as femto, pico, etc.).
  • NodeB Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low-power node such as femto, pico, etc.
  • base station can include some or all of their functions, and each base station can provide communication coverage for a specific geographic area.
  • the term "cell” may refer to a base station and/or its coverage area, depending on the context in which the term is used.
  • the term "User Equipment” refers to, for example, a device that accesses a communication network through a network device and receives network services, and may also be referred to as "Terminal Equipment” (TE, Terminal Equipment).
  • the terminal equipment can be fixed or mobile, and can also be called a mobile station (MS, Mobile Station), terminal, user, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, etc. Wait.
  • terminal devices may include but are not limited to the following devices: cellular phones (Cellular Phone), personal digital assistants (PDAs, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, Cordless phones, smart phones, smart watches, digital cameras, etc.
  • cellular phones Cellular Phone
  • PDAs personal digital assistants
  • wireless modems wireless communication devices
  • handheld devices machine-type communication devices
  • laptop computers Cordless phones
  • smart phones smart watches, digital cameras, etc.
  • a terminal device may also be a machine or device that performs monitoring or measurement.
  • it may include, but is not limited to: Machine Type Communication (MTC) terminals, Vehicle-mounted communication terminals, device to device (D2D, Device to Device) terminals, machine to machine (M2M, Machine to Machine) terminals, etc.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention, which schematically illustrates a case where a terminal device and a network device are taken as an example.
  • the communication system 100 may include: a network device 101 and a terminal device 102.
  • Figure 1 only uses one terminal device as an example for illustration.
  • the network device 101 is, for example, the network device gNB in the NR system.
  • eMBB enhanced mobile broadband
  • mMTC large-scale machine type communication
  • URLLC Ultra-Reliable and Low- Latency Communication
  • the terminal device 102 may send data to the network device 101, for example, using an unauthorized transmission mode.
  • the network device 101 can receive data sent by one or more terminal devices 102, and feedback information (for example, acknowledgement ACK/non-acknowledgement NACK) information to the terminal device 102, and the terminal device 102 can confirm the end of the transmission process according to the feedback information, or can further Perform new data transmission, or data retransmission can be performed.
  • feedback information for example, acknowledgement ACK/non-acknowledgement NACK
  • FIG 2 is a schematic diagram of the 4-step random access (4-step RA) method.
  • the first step is that the terminal device selects the preamble for random access.
  • the preamble (Msg1) is sent in the configured contention-based random access opportunity (RO, Random access Occasion); in the second step, the network device will send a random access response (RAR, Random Access Response) (Msg2) after receiving the preamble.
  • RO contention-based random access opportunity
  • RAR Random Access Response
  • the terminal device that is authorized to send the preamble has a dedicated uplink resource (such as PUSCH resource) and allocates a temporary CRNTI (TC-RNTI) to indicate the uplink advance of the PUSCH; the third step, the terminal device sends the carrying signaling on the PUSCH resource Or a data message (msg3); the fourth step, if the msg3 is successfully received, the network device sends the contention resolution signaling (msg4) for the msg3 to the terminal device.
  • a dedicated uplink resource such as PUSCH resource
  • TC-RNTI temporary CRNTI
  • FIG 3 is a schematic diagram of a 2-step random access method (2-step RA).
  • the first step the terminal device sends MsgA, and MsgA contains the preamble for random access (Referred to as MsgA preamble) and data part (MsgA signaling or service data, payload, referred to as MsgA data for short), the terminal device can send MsgA preamble in the competing RO and send MsgA signaling in the competing PUSCH resource Or service data;
  • the second step the network device sends MsgB after receiving MsgA, and sends random access response and contention resolution message to the terminal device through the MsgB. Therefore, in the 2-step random access mode, the terminal device can transmit without uplink scheduling during the random access process, upload signaling or service data in one step, and reduce random access signaling and time delay.
  • the network equipment can demodulate the MsgA data through the demodulation reference signal (DMRS, Demodulation Reference Signal) sent on the PUSCH resource of the MsgA data, where the DMRS sequence is the same as the sequence index used by the MsgA preamble sent by the terminal device ( index) related, the network device can obtain the DMRS corresponding to the preamble sequence index (preamble index) according to the preamble demodulated in the RO resource.
  • DMRS demodulation reference signal
  • the network device can demodulate the DMRS corresponding to the preamble sequence index (preamble index) Output MsgA data.
  • the network device can successfully demodulate the MsgA preamble, but the demodulation of the MsgA data fails.
  • -Step RA fails and falls back to 4-step RA
  • the network device will send a 4-step RA random access response (Msg2) to the terminal device, causing the terminal device to resend the MsgA data.
  • the network device may also configure the terminal device to fall back from 2-step RA to 4-step RA according to the network status or other conditions.
  • the network device After the network device receives the MsgA sent by the terminal device, it does not matter whether the MsgA data is resolved or not. If the adjustment is successful, it will send a 4-step RA random access response (Msg2) to the terminal device, so that the terminal device will fall back to 4-step RA.
  • Msg2 4-step RA random access response
  • Figure 4 is a schematic diagram of rollback from 2-step RA to 4-step RA. As shown in Figure 4, after receiving the MsgA sent by the terminal device, the network device feeds back Msg2 to the terminal device. Therefore, the random access process starts from 2-step RA is rolled back to 4-step RA, and the subsequent process is the same as 4-step RA.
  • Fig. 5 is a schematic diagram of a method for sending a random access response in this embodiment. Please refer to Fig. 5, the method includes:
  • Step 501 Receive a first message sent by a terminal device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • Step 502 Send random access response indication information and random access response to the terminal device; the random access response indication information indicates that the random access response is the first random access response or the second random access response
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least first contention resolution information for the data of the first message .
  • the foregoing first message may also be called a random access request, which may be MsgA in a 2-step random access process, including the foregoing random access preamble and the foregoing data (payload), such as As shown in Figure 3; it can also be Msg1 in the 4-step random access process, which only includes the aforementioned random access preamble, as shown in Figure 2.
  • MsgA in a 2-step random access process, including the foregoing random access preamble and the foregoing data (payload), such as As shown in Figure 3; it can also be Msg1 in the 4-step random access process, which only includes the aforementioned random access preamble, as shown in Figure 2.
  • the network device in addition to sending a random access response to the terminal device, the network device also sends random access response indication information to the terminal device. Whether the access response is the first random access response or the second random access response, the terminal device can distinguish the type of the random access response, and perform corresponding operations accordingly, so as to correctly execute the subsequent random access process.
  • the first message includes a random access preamble and data
  • the random access response indication information indicates that the random access response is the first random access response or the second random access response.
  • the uplink transmission authorization carried in the first random access response is used for the terminal device to retransmit the data of the first message.
  • the network device may determine the random access response indication information and the random access response based on whether the data of the first message is correctly analyzed.
  • the network device may send the random access response indication information and the first random access response to the terminal device (Similar to Msg2 in 4-step RA), the terminal device is instructed to receive the first random access response through the random access response indication information.
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device, and the uplink transmission authorization is used for the terminal device to retransmit the data of the above-mentioned first message. Therefore, the terminal device falls back to 4-step RA.
  • the first random access response may also carry a transmission time advance command (TAC), and the terminal device may adjust the data transmission advance according to the transmission time advance command; the first random access response may also carry TC-RNTI, The terminal equipment scrambles uplink data and receives msg4 PDCCH.
  • TAC transmission time advance command
  • TC-RNTI TC-RNTI
  • the network device may send the random access response indication information and the second random access to the terminal device.
  • the random access response instructs the terminal device to receive the second random access response.
  • the second random access response at least carries contention resolution information (referred to as first contention resolution information) for the data of the first message, and is used for the terminal device to perform contention resolution accordingly.
  • the second random access response may also carry a transmission time advance command (TAC), and the terminal device may adjust the data transmission advance according to the transmission time advance command; the second random access response may also carry C-RNTI, uplink Transmission of authorization or downlink data.
  • TAC transmission time advance command
  • the network device may not determine the random access response indication information and the random access response based on whether the data of the first message is correctly parsed, but may determine the random access response according to the network status or other conditions. Indication information and the aforementioned random access response.
  • the first message only includes a random access preamble
  • the random access response indication information indicates that the random access response is the first random access response
  • the first random access response carries The above uplink transmission authorization is used for the terminal device to send new data.
  • the network device sends the foregoing random access response indication information and the foregoing first random access response to the terminal device, and instructs the terminal device to receive the first random access response through the random access response indication information.
  • the first random access response at least carries the above-mentioned uplink transmission authorization, and the uplink transmission authorization is used for the terminal device to send new data.
  • the first random access response may also carry TC-RNTI or TAC.
  • the foregoing random access response indication information may be indication information of the physical layer, or indication information of the medium access control (MAC) layer.
  • MAC medium access control
  • the indication information of the physical layer may include at least one of the following:
  • a radio network temporary identifier used to scramble the cyclic redundancy check (CRC) of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the network device may use at least one of the above RNTI, the content of the PDCCH, and the format of the PDCCH as the random access response indication information to indicate the type of the random access response.
  • the indication information of the MAC layer may include at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the network device can use at least one of the MAC CE, the content of the random access response, and the subheader of the random access response as the random access response indication information to indicate the random access response.
  • the foregoing random access response indication information is the foregoing RNTI
  • the network device sending the random access response indication information to the terminal device may include:
  • the network device sends the PDCCH for scheduling the random access response to the terminal device, the CRC of the PDCCH is scrambled with the first RNTI or the second RNTI, and the first RNTI indicates that the random access response is the first random access. Incoming response, the second RNTI indicates that the random access response is the second random access response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the RNTI that scrambles the CRC of the PDCCH.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends the first random access response (similar to Msg2 of 4-step RA) to the terminal device and uses the first RNTI to scramble and schedule the CRC of the PDCCH of the first random access response .
  • the network device sends a second random access response (MsgB) to the terminal device and uses the second RNTI to scramble and schedule the CRC of the PDCCH of the MsgB.
  • MsgB random access response
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends a first random access response (similar to Msg2 of 4-step RA) to the terminal device, and uses the first RNTI
  • the CRC of the PDCCH scheduling the first random access response is scrambled.
  • the above-mentioned first RNTI and the above-mentioned second RNTI are different from each other, and may be related to the time-frequency resource position of the physical random access channel (PRACH) for sending the preamble by the terminal device and the type of random access response sent.
  • PRACH physical random access channel
  • the first RNTI and the RNTI can be calculated according to the following formula:
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_carrier_id+14 ⁇ 80 ⁇ 8 ⁇ 2 ⁇ rar_id
  • s_id (0 ⁇ s_id ⁇ 14) is the number of the first OFDM symbol of PRACH in the slot; t_id (0 ⁇ t_id ⁇ 80) is the first PRACH in the system frame Slot number; f_id (0 ⁇ f_id ⁇ 8) is the resource location index of PRACH in the frequency domain; ul_carrier_id (0 or 1) is the identifier of the uplink carrier that sends the preamble, for example, 0 means normal uplink carrier, 1 represents the supplementary uplink carrier; rar_id is the random access response identifier, for example, 0 represents the first random access response, and 1 represents the second random access response.
  • the above formula is only an example, and this embodiment does not limit the calculation method of the first RNTI and the second RNTI.
  • a transport block does not contain the first and second random access responses at the same time
  • the CRC of the PDCCH of the TB that is scheduled to include the first random access response is scrambled with the first RNTI
  • the scheduling includes the second random access response.
  • the CRC of the PDCCH of the access response TB is scrambled with the second RNTI.
  • the terminal equipment simultaneously detects the PDCCH scrambled by the first and second RNTI.
  • two terminal devices UE A and UE B simultaneously send MsgA preamble on a PRACH and send MsgA data on the physical uplink shared channel (PUSCH) corresponding to the PRACH, and the network device successfully decodes the UE MsgA data sent by B, but failed to demodulate the MsgA data sent by UE A.
  • the network device sends a first random access response for UE A in one TB (RA response a), and sends a second random access response for UE B in another TB (RA response b).
  • the first RNTI and the second RNTI may be RA-RNTI, but this embodiment is not limited to this, and the RNTI may also be other types of RNTI, such as C-RNTI.
  • the foregoing random access response indication information is the content of the foregoing PDCCH
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the first random access response or the second random access response. Into the response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the content in the PDCCH.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends the first random access response (similar to Msg2 of 4-step RA) to the terminal device and uses the content of the PDCCH (first indication information) that schedules the first random access response ) Indicates the first random access response.
  • the network device sends a second random access response (MsgB) to the terminal device and uses the content (first indication information) of the PDCCH scheduling the MsgB to indicate the second random access response.
  • MsgB second random access response
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends a first random access response to the terminal device, and uses the content of the PDCCH that schedules the first random access response ( The first indication information) indicates the first random access response.
  • the same RNTI can be used to scramble the CRC of the PDCCH of the first random access response and the second random access response, and the PDCCH can use the same PDCCH format.
  • the first indication information may occupy one bit of the PDCCH, and different values are used to distinguish whether the random access response is the first random access response or the second random access response. For example, when the value of the first indication information is 0, it indicates that the random access response is the first random access response; when the value of the first indication information is 1, it indicates that the random access response is the second random access response. Access response.
  • Table 1 is an example of the PDCCH containing the first indication information indicating the first random access response.
  • the format of the PDCCH is DCI format 1_0, and the CRC of the PDCCH is scrambled by RA-RNTI, and the DCI field of the PDCCH contains 1-bit random access response indication information for Indicates the type of random access response.
  • the following Table 2 is an example of the PDCCH containing the first indication information indicating the second random access response.
  • the format of the PDCCH is DCI format 1_0, and the CRC of the PDCCH is scrambled by RA-RNTI, and the DCI field of the PDCCH contains 1-bit random access response indication information for Indicates the type of random access response.
  • the foregoing random access response indication information is in the format of the foregoing PDCCH
  • the network device sending the random access response indication information to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in the first format or the second format, the first format indicates that the random access response is the first random access response, and the second format It indicates that the random access response is the second random access response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the format of the PDCCH.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends the first random access response (similar to Msg2 of 4-step RA) to the terminal device and uses the PDCCH format for scheduling the first random access response (for example, the first format) ) Indicates the first random access response.
  • the network device sends a second random access response (MsgB) to the terminal device and uses the format (for example, the second format) of the PDCCH scheduling the MsgB to indicate the second random access response.
  • MsgB the format of the PDCCH scheduling the MsgB to indicate the second random access response.
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends a first random access response to the terminal device, and uses the content of the PDCCH that schedules the first random access response ( The first indication information) indicates the first random access response.
  • the same RNTI can be used to scramble the CRC of the PDCCH of the first random access response and the second random access response, and the PDCCH can use different PDCCH formats, and different PDCCH format codes.
  • the number of bits is different.
  • the PDCCH of the first random access response uses DCI format 1_0
  • the PDCCH of the second random access response uses a new format, such as DCI format 1_x (x>1).
  • the foregoing random access response indication information is the foregoing MAC CE
  • the network device sending the random access response indication information to the terminal device may include:
  • the random access response transmission block sent by the network device to the terminal device includes the MAC CE, and the MAC CE includes second indication information.
  • the second indication information indicates that the random access response is the first random access response or the above Second random access response. Therefore, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the MAC CE in the received random access response transmission block.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends a random access response indication MAC CE and the first random access response (similar to Msg2 in 4-step RA) indicating the first random access response to the terminal device.
  • the network device sends a random access response indication MAC CE and the second random access response (MsgB) indicating the second random access response to the terminal device.
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends the terminal device a random access response indication MAC CE and the first random access response to the terminal device. response.
  • the second indication information may occupy one bit.
  • the random access response is the aforementioned first random access response;
  • the value of the second indication information is the second value, for example, when it is 1, the random access response is the foregoing second random access response. Therefore, the type of random access response is indicated by the one-bit information.
  • Figure 7 is an example of the MAC subPDU format of the random access response indication MAC CE.
  • the MAC CE only contains a 1-byte MAC subPDU subheader, of which 2 bits (E/T) can be transmitted.
  • Other control information for example, used to distinguish the random access response indication MAC CE subPDU and other types of subPDU; 1 bit is used to indicate the type of random access response, for example, 0 identifies the first random access response, 1 identifies the second Random access response; the remaining bits are reserved bits ("R" bits).
  • one random access response transmission block may include multiple MAC CEs and random access responses corresponding to each MAC CE, where each MAC CE is immediately followed by its corresponding random access response.
  • all the random access response indication MAC CE and the first random access response indicating the first random access response can be placed in the random access response indication indicating the second random access response in the transmission block of the MAC layer. Before MAC CE and the second random access response.
  • a random access response transmission block may contain both the first random access response and the second random access response.
  • two terminal devices UE A and UE B
  • UE A and UE B simultaneously send MsgA preamble on a PRACH and send MsgA data on the PUSCH corresponding to the PRACH, and the network device successfully decodes the MsgA data sent by UE B. But it failed to demodulate UE A's MsgA data.
  • the network device sends the random access response MAC CE and the first random access response for UE A, and the random access response MAC CE and the second random access response for UE B in the same TB.
  • the foregoing random access response indication information is the content of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the content of the random access response sent by the network device to the terminal device includes third indication information, which indicates that the random access response is the first random access response or the second random access response. Therefore, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the content contained in the random access response.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends a first random access response (similar to Msg2 in 4-step RA) to the terminal device, and the content of the first random access response contains the above-mentioned third indication information. To indicate the first random access response.
  • the network device sends a second random access response (MsgB) to the terminal device.
  • the content of the second random access response includes the above-mentioned third indication information for indicating the second random access response .
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends a first random access response to the terminal device, and the content of the first random access response includes the foregoing third indication The information is used to indicate the first random access response.
  • the third indication information may occupy one bit.
  • the value of the third indication information is a third value, for example, 0, the random access response is the first random access response;
  • the value of the third indication information is a fourth value, for example, when it is 1, the random access response is the second random access response.
  • the third indication information may be a preset control bit in the content of the random access response, and one control bit is used in the content of the random access response to indicate whether the following is the first random access response or the second random access response. Access response.
  • FIG. 9 is a schematic diagram of the first random access response.
  • Fig. 10 is a schematic diagram of the second random access response.
  • the content of the second random access response may not include UL grant, C-RNTI, TAC, etc. shown in FIG. 10.
  • all the first random access responses can be placed before the second random access responses in the transmission block of the MAC layer.
  • one random access transmission block may contain both the first random access response and the second random access response.
  • two terminal devices UE A and UE B
  • UE A and UE B simultaneously send MsgA preamble on a PRACH and send MsgA data on the PUSCH corresponding to the PRACH, and the network device successfully decodes the MsgA data sent by UE B. But it failed to demodulate UE A's MsgA data.
  • the network device sends the first random access response for UE A and the second random access response for UE B in the same TB, and the content of each random access response carries third indication information (control bit) indication Random access type.
  • the foregoing random access response indication information is a subheader of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the subheader of the MAC layer sub-PDU of the random access response sent by the network device to the terminal device contains fourth indication information, which indicates that the random access response is the first random access response or the second random access response. Random access response. Therefore, the terminal device can determine whether the random access response is the first random access response or the second random access response according to the subheader of the random access response.
  • the network device can determine whether the data part of the MsgA can be correctly parsed.
  • the network device sends a first random access response (similar to Msg2 in 4-step RA) to the terminal device, and the subheader of the MAC subPDU containing the first random access response contains the above
  • the fourth indication information is used to indicate the first random access response.
  • the network device sends a second random access response (MsgB) to the terminal device.
  • MsgB random access response
  • the subheader of the MAC subPDU containing the second random access response contains the fourth indication information for indicating the first 2. Random access response.
  • the network device after receiving the 4-step RA random access preamble sent by the terminal device, the network device sends a first random access response to the terminal device, including the subheader of the MAC subPDU of the first random access response
  • the fourth indication information is used to indicate the first random access response.
  • the above subheader may occupy 2 bytes, and the fourth indication information may occupy one bit.
  • the random access response is The first random access response; when the value of the fourth indication information is a sixth value, for example, 1, the random access response is the second random access response.
  • the fourth indication information may be a control bit preset in the subheader, and one control bit is used in the subheader to indicate whether the following is the first random access response or the second random access response.
  • all the subPDUs of the first random access response can be placed before the subPDUs of the second random access response in the transmission block of the MAC layer.
  • Figure 12 is an example of the subheader of the MAC SubPDU of the random access response.
  • the subheader consists of 2 bytes, and the control information indicating the type of the random access response (the "C” bit in the figure) ) Occupies 1 bit, "0" can be used to identify the first random access response, and "1" can be used to identify the second random access response.
  • the remaining positions can be used to transmit the preamble identification and other control information.
  • the preamble identifier can occupy 6 bits, as shown in "PAPID" in Figure 12.
  • Other control information is used, for example, to distinguish the random access response subPDU from the control information of other types of subPDUs, such as the "E"/"T" bits shown in FIG. 12. Unused positions can be filled with reserved bits "R".
  • a random access response transmission block may contain both the first random access response and the second random access response.
  • two terminal devices UE A and UE B
  • UE A and UE B simultaneously send MsgA preamble on a PRACH and send MsgA data on the PUSCH corresponding to the PRACH.
  • the network device successfully decodes the MsgA data sent by UE B. But it failed to demodulate UE A's MsgA data.
  • the network device sends the first random access response for UE A and the second random access response for UE B in the same TB, and the subheader of the MAC subPDU of each random access response carries the foregoing fourth indication
  • the information indicates the type of random access response.
  • the network device in 2-step RA, when the demodulation of MsgA data succeeds, the network device sends MsgB to the terminal device. In the case of failure of demodulation of MsgA data, the 2-step RA fails and falls back to 4. -step RA, the network device will send a 4-step RA random access response (first random access response) to the terminal device, so that the terminal device will resend the data part of the MsgA. Therefore, after the terminal device sends the 2-step RA preamble, it may receive the MsgB or 4-step RA random access response (Msg2).
  • Msg2 4-step RA random access response
  • MsgA includes CCCH SDU in initial random access
  • MsgA includes C-RNTI MAC CE in random access in the connected state. Therefore, the MsgA data is successfully decoded.
  • the network device will send a random access response (MsgB) containing different contention resolution information to the terminal device. According to the foregoing embodiment, the terminal device still cannot identify the different MsgB, and therefore cannot perform contention resolution correctly.
  • the random access response may also be a third random access response; the random access response indication information may also indicate whether the random access response is a third random access response, and the third random access response
  • the incoming response carries at least the second contention resolution information for the data of the first message.
  • the network device may determine the random access response indication information and the random access response based on whether the data of the first message is correctly parsed and the data content of the first message.
  • the network device After the network device receives the random access preamble (such as the preamble of the MsgA of 2-step RA) sent by the terminal device, it can determine whether the data part of the MsgA can be decoded correctly.
  • the random access preamble such as the preamble of the MsgA of 2-step RA
  • the network device sends the random access response indication information and the first random access response (similar to msg2 of 4-step RA) to the terminal device, and the random access response indication information is used To instruct the terminal device to receive the first random access response.
  • the first random access response can allow the terminal device to fall back to 4-step RA, and the specific content is as described above.
  • the network device sends the terminal device Random access response indication information and a second random access response (ie MsgB of 2-step RA), the random access response indication information is used to instruct the terminal device to receive the second random access response.
  • CCCH common control channel
  • SDU service data unit
  • the second random access response is used to allow the terminal device to perform contention resolution, and contains at least contention resolution information (referred to as first contention resolution information), and the contention resolution information at least carries the aforementioned CCCH SDU contained in the data part of the MsgA.
  • the contention resolution information may also carry TAC, C-RNTI, uplink transmission authorization or downlink data.
  • the network device sends the random access response indication information and the third random access response (That is, MsgB of 2-step RA, the random access response indication information is used to instruct the terminal device to receive the third random access response.
  • the third random access response is used to allow the terminal device to perform contention resolution, and contains at least contention resolution information (called second contention resolution information), and the contention resolution information carries at least the aforementioned C-RNTI contained in the data part of the first message.
  • the contention resolution information can also carry TAC, uplink transmission authorization or downlink data.
  • the network device may also decide whether to send the first random access response or the second or third random access based on the network status or other conditions, not based on whether the data of the first message is correctly parsed. response.
  • the random access response indication information may be at least one of the following: physical layer indication information ; MAC layer indication information; physical layer indication information and MAC layer indication information; and two types of MAC layer indication information. That is, the network device can indicate the type of random access response in 2-step RA through physical layer information or MAC layer information, or through physical layer information and MAC layer information at the same time, or through both MAC layer information. Instructions.
  • the physical layer indication information may include at least one of the following: a wireless network temporary identifier (CRC) used to scramble and schedule the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response (RNTI); the content of the PDCCH for scheduling the random access response; and the format of the PDCCH for scheduling the random access response.
  • the MAC layer indication information may include at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; a random access control unit (MAC CE) included in the random access response transmission block; The content of the incoming response; and the subheader of the random access response contained in the random access response transmission block.
  • MAC CE medium access control unit
  • MAC CE random access control unit
  • the foregoing random access response indication information is the foregoing RNTI
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends the PDCCH for scheduling the random access response to the terminal device, and the CRC of the PDCCH may be scrambled with a third RNTI; the third RNTI indicates that the random access response is the third random access response.
  • the network device After the network device receives the random access preamble (such as the preamble of the MsgA of 2-step RA) sent by the terminal device, it can determine whether the data part of the MsgA can be decoded correctly.
  • the random access preamble such as the preamble of the MsgA of 2-step RA
  • the network device can send a first random access response (similar to msg2 of 4-step RA) to the terminal device and use the first RNTI to scramble and schedule the CRC of the PDCCH of the random access response.
  • a first random access response similar to msg2 of 4-step RA
  • the network device can send a second random access response (MsgB) to the terminal device and use the second RNTI to scramble and schedule the CRC of the PDCCH of MsgB; if MsgA carries It is CRNTI MAC CE, the network device can send the third random access response (MsgB) to the terminal device and use the third RNTI to scramble the CRC of the PDCCH scheduling MsgB.
  • MsgB second random access response
  • MsgB third random access response
  • the first RNTI, the second RNTI, and the third RNTI are different from each other, and are related to the PRACH time-frequency resource location and random access response type of the 2-step RA preamble sent by the terminal device, for example, according to the following The formula is calculated:
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_carrier_id+14 ⁇ 80 ⁇ 8 ⁇ 2 ⁇ rar_id
  • s_id (0 ⁇ s_id ⁇ 14) is the number of the first OFDM symbol of PRACH in the slot; t_id (0 ⁇ t_id ⁇ 80) is the first PRACH in the system frame Slot number; f_id (0 ⁇ f_id ⁇ 8) is the resource location index of PRACH in the frequency domain; ul_carrier_id (0 or 1) is the identifier of the uplink carrier that sends the preamble, for example, 0 means normal uplink carrier, 1 represents the supplementary uplink carrier; rar_id is the random access response identifier, for example, 0 represents the first random access response, 1 represents the second random access response, and 2 represents the third random access response.
  • the above formula is only an example, and this embodiment does not limit the calculation methods of the first RNTI, the second RNTI, and the third RNTI.
  • the third RNTI may also be a C-RNTI.
  • the C-RNTI is consistent with the C-RNTI contained in the data of the first message.
  • the network device uses the PDCCH scrambled by the C-RNTI to indicate the third random access. Into the response.
  • the network device may first use the C-RNTI to identify the third access response, and further use other indication information of the physical layer or MAC layer to distinguish the first random access response from the second random access response, including the use of the physical layer and/or They are distinguished by MAC layer information, so I will not repeat them here.
  • the foregoing random access response indication information is the content of the foregoing PDCCH
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes fifth indication information, and the fifth indication information indicates that the random access response is the third random access response.
  • This embodiment does not limit the implementation of the fifth indication information.
  • the foregoing random access response indication information is in the format of the foregoing PDCCH
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends a PDCCH for scheduling the foregoing random access response to the terminal device, where the PDCCH is in a third format, and the third format is used to indicate that the random access response is the foregoing third random access response.
  • This embodiment does not limit the implementation of the third format.
  • the foregoing random access response indication information is the foregoing RNTI and the foregoing MAC layer indication information
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends the PDCCH used to schedule the random access response to the terminal device.
  • the CRC of the PDCCH is scrambled with the fourth RNTI or the fifth RNTI; the fourth RNTI indicates that the random access response is the first random An access response, where the fifth RNTI indicates that the random access response is not the foregoing first random access response;
  • the network device also sends the aforementioned MAC layer indication information to the terminal device. If the random access response is not the aforementioned first random access response, the MAC layer indication information is used to indicate that the random access response is the aforementioned second random access response. Random access response or the aforementioned third random access response.
  • first use RNTI to distinguish the first random access response and non-first random access response (second or third random access response)
  • second or third random access response first use RNTI to distinguish the first random access response and non-first random access response
  • MAC layer indication information to distinguish the second random access response And the third random access response.
  • the method and principle of using RNTI to distinguish the first random access response from the non-first random access response are the same as the aforementioned method of using RNTI to distinguish the first random access response from the second random access response.
  • the principle is the same.
  • the fourth RNTI and the fifth RNTI can be calculated by the following formula:
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_carrier_id+14 ⁇ 80 ⁇ 8 ⁇ 2 ⁇ rar_id
  • s_id (0 ⁇ s_id ⁇ 14) is the number of the first OFDM symbol of PRACH in the slot; t_id (0 ⁇ t_id ⁇ 80) is the first PRACH in the system frame Slot number; f_id (0 ⁇ f_id ⁇ 8) is the resource location index of PRACH in the frequency domain; ul_carrier_id (0 or 1) is the identifier of the uplink carrier that sends the preamble, for example, 0 means normal uplink carrier, 1 represents the supplementary uplink carrier; rar_id is the random access response identifier, for example, 0 represents the first random access response, and 1 represents the non-first random access response (second or third random access response).
  • the above formula is only an example, and this embodiment does not limit the calculation methods of the fourth RNTI and the fifth RNTI.
  • the method and principle of using the MAC layer indication information to distinguish the second random access response from the third random access response is the same as that of using the MAC layer indication information to distinguish the first random access response from the second random access response.
  • the method and principle of the input response are the same, so the description is omitted here.
  • the foregoing random access response indication information is the content of the foregoing PDCCH and the MAC layer indication information
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, where the content of the PDCCH includes sixth indication information; the sixth indication information indicates whether the random access response is the foregoing first random access response.
  • the network device also sends MAC layer indication information to the terminal device. If the random access response is not the first random access response, the MAC layer indication information is used to indicate that the random access response is the second random access response. Random access response or the aforementioned third random access response.
  • the method and principle of using the content of the PDCCH (the sixth indication information) to distinguish the first random access response from the non-first random access response is different from the aforementioned using the first indication information to distinguish the first random access.
  • the method and principle of the response and the second random access response are the same, and the description is omitted here.
  • the method and principle of using the MAC layer indication information to distinguish the second random access response from the third random access response is the same as that of using the MAC layer indication information to distinguish the first random access response from the second random access response.
  • the method and principle of the input response are the same, so the description is omitted here.
  • the aforementioned random access response indication information is the format of the aforementioned PDCCH and the MAC layer indication information
  • the network device sending the random access response indication information and the random access response to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, the PDCCH is in the fourth format or the fifth format, and the fourth format indicates that the random access response is the foregoing first random access response.
  • the five format indicates that the random access response is not the first random access response.
  • the network device also sends the aforementioned MAC layer indication information to the terminal device. If the random access response is not the aforementioned first random access response, the MAC layer indication information indicates that the random access response is the aforementioned second random access response. Access response or the aforementioned third random access response.
  • the PDCCH format is used to distinguish the first random access response from the non-first random access response (second or third random access response), and then the MAC layer control information is used to distinguish the second random access response. Incoming response and the third random access response.
  • the method and principle of using the PDCCH format to distinguish the first random access response from the non-first random access response is the same as using the PDCCH format to distinguish the first random access response from the second random access response.
  • the response method and principle are the same, so the description is omitted here.
  • the method and principle of using the MAC layer indication information to distinguish the second random access response from the third random access response is the same as that of using the MAC layer indication information to distinguish the first random access response from the second random access response.
  • the method and principle of the input response are the same, so the description is omitted here.
  • the foregoing random access response indication information is the foregoing MAC CE
  • the network device sending the random access response indication information to the terminal device may include:
  • the random access response transmission block sent by the network device to the terminal device includes the foregoing MAC CE, which includes seventh indication information, and the seventh indication information indicates that the random access response is the foregoing third random access response.
  • the MAC CE of the random access response transmission block realizes the indication of the third random access response, and the MAC CE can also be used to indicate the aforementioned first random access response indication information and the aforementioned second random access response indication information. Random access response indication information.
  • the random access response indicating MAC CE is identified by the logical channel number (LCID) in the subheader of the MAC subPDU, and the LCID value of the random access response indicating MAC CE is a system preset value, for example, set to a range of 33-46 value.
  • LCID logical channel number
  • FIG. 14 is an example of the format of the MAC subPDU subheader of the random access response indication MAC CE.
  • the MAC CE only contains a 1-byte MAC subPDU subheader, of which 2 bits (E/T) can transmit other control information, for example, to distinguish between the subPDU of the MAC CE and the subPDU of the random access response indication MAC CE.
  • Other types of subPDU 2 bits are used to indicate the type of random access response, for example, 00 identifies the first random access response, 01 identifies the second random access response, and 11 identifies the third random access response; the remaining bits are reserved Bits ("R" bits).
  • the foregoing random access response indication information is the content of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the content of the random access response sent by the network device to the terminal device includes eighth indication information, which indicates that the random access response is the third random access response.
  • the indication of the third random access response is realized through the content of the random access response.
  • the content of the random access response may also be used to indicate the foregoing first random access response indication information and the foregoing second random access response indication information.
  • one control bit can be used in the content of the random access response to indicate whether the following is the first random access response or the second or third random access response.
  • Figure 15 is a schematic diagram of the format of the first random access response.
  • the first random access response is distinguished from the non-first random access response (second or third random access For example, when C is 0, it indicates that it is the first random access response, and when C is 1, it indicates that it is not the first random access response (second or third random access response).
  • FIG. 16 is a schematic diagram of the format of the second random access response. As shown in Figure 16, the second and third random access responses are distinguished by the control bit "D". For example, when D is 0, it indicates that the random access response is Second random access response. FIG. 16 is only an example of the second random access response, and the content of the second random access response may not include the C-RNTI or TAC shown in FIG. 16.
  • FIG. 17 is a schematic diagram of the format of the third random access response. As shown in Figure 17, the second and third random access responses are distinguished by the control bit "D". For example, when D is 1, it indicates that the random access response is the first 3. Random access response. FIG. 17 is only an example of the third random access response, and the third random access response may not include the TAC shown in FIG. 17.
  • the foregoing random access response indication information is a subheader of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the subheader of the MAC layer sub-PDU of the random access response sent by the network device to the terminal device includes ninth indication information, which indicates that the random access response is the aforementioned third random access response.
  • the content of the third random access response is indicated through the subheader of the random access response MAC subPDU.
  • the subheader can occupy 2 bytes, and the above-mentioned ninth indication information occupies two bits.
  • the value of the ninth indication information is the seventh value, for example, 00
  • the random access response is The foregoing first random access response
  • the value of the ninth indication information is an eighth value, for example, 01
  • the random access response is the foregoing second random access response
  • the value of the ninth indication information is When the ninth value is 11, for example, the random access response is the aforementioned third random access response.
  • Figure 18 is an example of the subheader of the MAC SubPDU of the random access response.
  • the subheader consists of 2 bytes.
  • the control information indicating the type of the random access response (“ RARID") occupies 2 bits, and "00" can be used to identify the first random access response, "01” can be used to identify the second random access response, and "10" can be used to identify the third random access response.
  • the remaining position can be used to transmit the Preamble ID and other control information.
  • the preamble ID can occupy 6 bits, as shown in "PAPID” in Figure 18; other control information is used to distinguish between the random access response subPDU and the control information of other types of subPDUs, such as "E"/"T” bits shown in Figure 18. Unused positions can be filled with reserved bits "R”.
  • the random access response indication information is the subheader of the random access response and the content of the random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the subheader of the MAC layer sub-PDU of the random access response sent by the network device to the terminal device includes tenth indication information, which indicates whether the random access response is the first random access response.
  • the content of the random access response includes the eleventh indication information. If the random access response is not the first random access response, the eleventh indication information indicates that the random access response is the above The second random access response or the aforementioned third random access response.
  • the method and principle of using the subheader of the random access response to distinguish the first random access response from the non-first random access response is the same as that of using the subheader of the random access response to distinguish the first random access response.
  • the methods and principles of the incoming response and the second random access response are the same, and the description is omitted here.
  • the method and principle of using the content of the random access response to distinguish the second random access response from the third random access response is different from the aforementioned using the content of the random access response to distinguish the first random access response from
  • the method and principle of the second random access response are the same, and the description is omitted here.
  • the foregoing random access response indication information is the content or subheader of the foregoing MAC CE and the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the random access response transmission block sent by the network device to the terminal device includes the above MAC CE, and the MAC CE includes twelfth indication information, and the twelfth indication information indicates whether the random access response is the first random access response. .
  • the content or subheader of the random access response includes thirteenth indication information. If the random access response is not the first random access response, the thirteenth indication information indicates the random access response. Is the second random access response or the third random access response.
  • the method and principle of using the MAC CE to distinguish the first random access response from the non-first random access response is the same as using the MAC CE to distinguish the first random access response from the second random access response.
  • the method and principle are the same, and the description is omitted here.
  • the method and principle of using the content or sub-header of the random access response to distinguish the second random access response from the third random access response is different from the foregoing using the content or sub-header of the random access response to distinguish the first random access response.
  • the method and principle of the first random access response and the second random access response are the same, and the description is omitted here.
  • the network device indicates the type of random access response to the terminal device, which is used for the terminal device to distinguish that the received random access response is of 2-step RA MsgB is also Msg2 of 4-step RA, so that the subsequent random access process is executed correctly.
  • the network device indicates the type of the random access response to the terminal device, which is used for the terminal device to distinguish the contention resolution information contained in the received random access response, so as to correctly execute the subsequent random access process.
  • This embodiment provides a method for receiving a random access response, which is applied to a terminal device, and is a processing on the terminal device side corresponding to the method in Embodiment 1, wherein the same content as in Embodiment 1 will not be repeated.
  • FIG. 19 is a schematic diagram of a method for receiving a random access response in this embodiment. As shown in FIG. 19, the method includes:
  • Step 1901 Send a first message to a network device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • Step 1902 Receive random access response and random access response indication information sent by the network device
  • Step 1903 According to the random access response indication information, it is determined that the random access response is the first random access response or the second random access response; the first random access response at least carries the network device The uplink transmission authorization allocated by the terminal device; the second random access response carries at least first contention resolution information for the data of the first message.
  • the uplink transmission authorization carried in the first random access response The data used for the terminal device to retransmit the first message; if the first message only includes the random access preamble, that is, the first message is Msge1 of 4-step RA, the first random access
  • the uplink transmission authorization carried in the incoming response is used by the terminal device to send new data.
  • the random access response indication information may be physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI; wherein the terminal device can receive the PDCCH sent by the network device; if the received CRC of the PDCCH is scrambled by the first RNTI, it is determined The random access response is the first random access response; if the received CRC of the PDCCH is scrambled by a second RNTI, it is determined that the random access response is the second random access response.
  • the indication of the random access response type is realized through RNTI.
  • the terminal device After the terminal device sends the preamble of the MsgA of the 2-step RA, it can judge whether the received random access response is the first random access response or the second random access response according to the reception of the PDCCH.
  • the terminal device determines that the TB contains the first random access response.
  • the terminal device determines that the TB contains the second random access response.
  • the calculation method of the above-mentioned first RNTI and the above-mentioned second RNTI is the same as in Embodiment 1, and the description is omitted here.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether the first random access response is received according to the reception of the PDCCH. If the CRC part of the PDCCH received by the terminal device in the random access window is scrambled by the first RNTI, and a MAC subPDU in the TB indicated by the PDCCH contains a preamble identifier that matches the 4-step RACH preamble sent , The terminal device determines to receive the first random access response.
  • the random access response indication information is the content of the PDCCH; the terminal device may receive the PDCCH sent by the network device, and the PDCCH includes the first indication information; the terminal device may be based on the first indication information.
  • the indication information determines that the random access response is the first random access response or the second random access response.
  • the content of the PDCCH indicates the type of random access response.
  • the terminal device After the terminal device sends the preamble of the MsgA of the 2-step RA, it can judge whether it received the first or second random access response according to the reception of the PDCCH.
  • the terminal device determines that the TB contains the first random access response.
  • the terminal device determines that the TB contains the second random access response.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether the first random access response is received according to the content of the PDCCH. If the content of the PDCCH received by the terminal device within the random access window indicates the first random access response, and a MAC subPDU in the TB indicated by the PDCCH contains a preamble identifier that matches the 4-step RACH preamble sent, Then the terminal device determines to receive the first random access response.
  • the random access response indication information is in the format of the PDCCH; the terminal device can receive the PDCCH sent by the network device; if the received PDCCH is in the first format, determine the random access The incoming response is the first random access response; if the received PDCCH is in the second format, it is determined that the random access response is the second random access response.
  • the type of random access response is indicated through the format of the PDCCH.
  • the terminal device After the terminal device sends the preamble of the MsgA of the 2-step RA, it can judge whether it received the first or second random access response according to the reception of the PDCCH.
  • the terminal device determines that the TB contains the first random access response.
  • the terminal device determines that the TB contains the second random access response.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether the first random access response is received according to the format of the PDCCH. If the format of the PDCCH received by the terminal device in the random access window indicates the first random access response, and one of the MAC subPDUs in the TB indicated by the PDCCH contains a preamble identifier that matches the 4-step RACH preamble sent, Then the terminal device determines to receive the first random access response.
  • the random access response indication information is the MAC CE; the terminal device may receive a random access response transmission block sent by the network device, and the random access response transmission block includes the MAC CE, the MAC CE includes second indication information; the terminal device may determine according to the second indication information that the random access response is the first random access response or the second random access response.
  • the terminal device after the terminal device sends the preamble of the MsgA of the 2-step RA, it can determine whether the received random access response is the first or the second random access response according to the random access response indication MAC CE.
  • the terminal device receives the PDCCH scrambled by the RNTI in the random access window, the random access response contained in a MAC subPDU in the TB indicated by the PDCCH indicates that the MAC CE identifies the first random access response, and The next MAC subPDU included in the TB contains a preamble identifier that matches the sent 2-step RACH preamble, and the terminal device determines that it has received the first random access response.
  • the above RNTI is related to the time-frequency resource location of the PRACH of the 2-step RA preamble sent by the terminal device, and can refer to existing standards.
  • the terminal device receives the PDCCH scrambled by RNTI in the random access window, the random access response contained in one of the MAC subPDUs in the TB indicated by the PDCCH indicates that the MAC CE identifies the second random access response, and the The next MAC subPDU included in the TB contains a preamble identifier that matches the sent 2-step RACH preamble, and the terminal device determines that the received second random access response is.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether it received the first or second random access response according to the random access response indication MAC CE. If the terminal device receives the PDCCH scrambled by the RNTI in the random access window, the random access response contained in a MAC subPDU in the TB indicated by the PDCCH indicates that the MAC CE identifies the first random access response, and The next MAC subPDU included in the TB contains a preamble identifier that matches the transmitted 4-step RACH preamble, and the terminal device determines to receive the first random access response.
  • the random access response indication information is the content of the random access response; the terminal device may receive the random access response sent by the network device, and the content of the random access response includes the third Indication information; determining whether the random access response is the first random access response or the second random access response according to the third indication information.
  • the terminal device after the terminal device sends the preamble of the MsgA of the 2-step RA, it can determine whether it received the first or second random access response according to the control bit (third indication information) in the content of the random access response.
  • the terminal device determines that the first random access response is received.
  • the above RNTI is related to the time-frequency resource location of the PRACH of the 2-step RA preamble sent by the terminal device, and can refer to existing standards.
  • one of the MAC subPDUs in the TB indicated by the PDCCH contains the preamble identifier that matches the transmitted 2-step RACH preamble, and the MAC subPDU
  • the control bit in the content part of the random access response indicates the second random access response, and the terminal device determines that the second random access response is received.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether it received the first or second random access response according to the control bit (third indication information) in the content of the random access response. If the terminal device receives the PDCCH scrambled by the RNTI in the random access window, one of the MAC subPDUs in the TB indicated by the PDCCH contains the preamble identifier that matches the 4-step RACH preamble sent, and the MAC subPDU The control bit of the random access content part indicates the first random access response, and the terminal device determines that the first random access response is received.
  • the control bit of the random access content part indicates the first random access response, and the terminal device determines that the first random access response is received.
  • the random access response indication information is a subheader of the random access response; the terminal device may receive the random access response sent by the network device, and the MAC layer subheader of the random access response
  • the subheader of the PDU includes fourth indication information; it is determined according to the fourth indication information that the random access response is the first random access response or the second random access response.
  • the terminal device after the terminal device sends the preamble of the MsgA of the 2-step RA, it can determine whether it received the first or second random access response according to the control bit (fourth indication information) in the random access response subPDU.
  • the terminal device determines that the first random access response is received.
  • the above RNTI is related to the time-frequency resource location of the PRACH of the 2-step RA preamble sent by the terminal device, and can refer to existing standards.
  • the terminal device determines that the second random access response is received.
  • the terminal device after the terminal device sends the 4-step RA preamble, it can determine whether it received the first or second random access response according to the control bit (fourth indication information) in the subPDU subheader of the random access response. If the terminal device receives the PDCCH scrambled by RNTI in the random access window, one of the MAC subPDUs in the TB indicated by the PDCCH contains the preamble identifier that matches the transmitted 2-step RACH preamble, and the MAC subPDU subheader If the preset control information (fourth indication information) in the data indicates the first random access response, the terminal device determines to receive the first random access response.
  • the control bit fourth indication information
  • the above random access response may also be a third random access response; the random access response indication information may also indicate that the random access response is a third random access response, and the third random access response
  • the random access response carries at least second contention resolution information for the data of the first message; the terminal device may determine that the random access response is the third random access according to the random access response indication information response.
  • the random access response indication information is at least one of the following: physical layer indication information; MAC layer indication information; physical layer indication information and MAC layer indication information; and two types of MAC layer indication information.
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the terminal device after the terminal device sends the preamble of the MsgA of 2-step RA or the preamble of 4-step RA, it can determine whether the random access response indication information indicates the first, second or third random access. Into the response.
  • the terminal device resends the MsgA data according to the resources indicated by the uplink transmission authorization included in the first random access response.
  • the terminal device can determine whether the contention resolution is successful according to the contention resolution information in the second random access response. If the contention resolution information in the second random access response matches the CCCH SDU included in the MsgA data, the terminal device determines that the contention resolution is successful, otherwise it fails.
  • the terminal device can determine whether the contention resolution is successful according to the contention resolution information in the third random access response. If the contention resolution information in the third random access response matches the C-RNTI MAC CE included in the MsgA data, the terminal device determines that the contention resolution is successful, otherwise it fails.
  • the terminal device sends the 4-step RA preamble
  • the terminal device if the network device indicates the first random access response, the terminal device sends the data for the first random access response according to the resources indicated by the uplink transmission authorization included in the first random access response. Do data for competitive resolution.
  • the random access response indication information is the RNTI; the terminal device can receive the PDCCH sent by the network device; if the CRC of the PDCCH is scrambled with the first RNTI, it is determined that the random access response is The first random access response; if the CRC of the PDCCH is scrambled with a second RNTI, it is determined that the random access response is the second random access response; if the CRC of the PDCCH uses a third RNTI When scrambling, it is determined that the random access response is the third random access response.
  • the terminal device after the terminal device sends the preamble of the MsgA of the 2-step RA, it can determine the received random access response according to the reception of the PDCCH.
  • the terminal device determines What this TB contains is the first random access response.
  • the terminal device determines that the TB contains the second Random access response.
  • the terminal device determines that the TB contains The third random access response.
  • the third RNTI may also be a C-RNTI, which is consistent with the C-RNTI contained in the data of the first message, if the PDCCH received by the terminal device is scrambled by the C-RNTI , It is determined that the third random access response is received.
  • the terminal device may first use the C-RNTI to identify the third access response, and further use other indication information of the physical layer or MAC layer to distinguish the first random access response from the second random access response, including using the physical layer and/or It is distinguished by MAC layer information, and will not be repeated here. If the terminal receives the PDCCH scrambled by the C-RNTI, the terminal determines that the third random access response is received and the contention resolution is successful.
  • the random access response indication information is the content of the PDCCH; the terminal device may receive the PDCCH sent by the network device, and the PDCCH includes fifth indication information; if the fifth indication information contained in the PDCCH If the third random access response is indicated, it is determined that the random access response is the third random access response.
  • the random access response indication information is the format of the PDCCH; the terminal device can receive the PDCCH sent by the network device; if the format of the PDCCH is the third format, it is determined that the random access response is The third random access response.
  • the random access response indication information is the RNTI and the MAC layer indication information; the terminal device may receive the PDCCH and the MAC layer indication information sent by the network device; if the CRC of the PDCCH If the fourth RNTI is used for scrambling, it is determined that the random access response is the first random access response; if the CRC of the PDCCH is scrambled using the fifth RNTI, the random access response is determined according to the MAC layer indication information.
  • the access response is the second random access response or the third random access response.
  • the random access response indication information is the content of the PDCCH and the MAC layer indication information; the terminal device may receive the PDCCH and the MAC layer indication information sent by the network device, and the PDCCH
  • the content includes sixth indication information; if the sixth indication information indicates the first random access response, it is determined that the random access response is the first random access response; if the sixth indication information does not indicate the In the first random access response, it is determined according to the MAC layer indication information that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the format of the PDCCH and the MAC layer indication information; the terminal device may receive the PDCCH and the MAC layer indication information sent by the network device; if the PDCCH If it is the fourth format, it is determined that the random access response is the first random access response; if the PDCCH is the fifth format, it is determined that the random access response is the The second random access response or the third random access response.
  • the random access response indication information is the MAC CE; the terminal device may receive the MAC CE sent by the network device, and the MAC CE includes seventh indication information; if the seventh indication If the information indicates the third random access response, it is determined that the random access response is the third random access response.
  • the random access response indication information is the content of the random access response; the terminal device may receive the random access response sent by the network device, and the content of the random access response includes the eighth indication Information; if the eighth indication information indicates a third random access response, it is determined that the random access response is the third random access response.
  • the random access response indication information is a subheader of the random access response; the terminal device may receive the random access response sent by the network device, and the MAC layer subPDU of the random access response
  • the subheader of contains ninth indication information; if the ninth indication information indicates the third random access response, it is determined that the random access response is the third random access response.
  • the random access response indication information is the subheader of the random access response and the content of the random access response; the terminal device may receive the random access response sent by the network device, and the The subheader of the MAC layer subPDU of the random access response includes tenth indication information, and the content of the random access response includes the eleventh indication information; if the tenth indication information indicates the first random access response, it is determined The random access response is the first random access response; if the tenth indication information does not indicate the first random access response, the random access response is determined according to the eleventh indication information Is the second random access response or the third random access response.
  • the random access response indication information is the content or subheader of the MAC CE and the random access response; the terminal device may receive the MAC CE and the random access response, and the MAC
  • the CE includes twelfth indication information, and the content or subheader of the random access response includes thirteenth indication information; if the twelfth indication information indicates the first random access response, determine the random access response Is the first random access response; if the twelfth indication information does not indicate the first random access response, it is determined according to the thirteenth indication information that the random access response is the second random access response An incoming response or the third random access response.
  • the network device indicates the type of the random access response by sending the random access response indication information to the terminal device. According to this, the terminal device can correctly perform the subsequent random access process.
  • FIG. 20 is a schematic diagram of a method for sending a random access response in this embodiment. Please refer to FIG. 20. The method includes:
  • Step 2001 Receive a first message sent by a terminal device, where the first message includes a random access preamble and data;
  • Step 2002 Send random access response indication information and random access response to the terminal device; the random access response indication information indicates that the random access response is a second random access response or a third random access response ,
  • the second random access response carries at least first contention resolution information for the data of the first message, and the third random access response carries at least second contention resolution information for the data of the first message .
  • the content of the MsgA data sent by the terminal device may be different.
  • the MsgA data may include CCCH SDU.
  • MsgA data may include C-RNTI MAC CE. Therefore, in the case of successful decoding of MsgA data, according to the content of the MsgA data, the network device sends a random access response (MsgB) containing different contention resolution information to the terminal device, and sends random access response indication information to the terminal device, Used for the terminal device to distinguish the contention resolution information contained in the received MsgB, so as to correctly execute the subsequent process.
  • MsgB random access response
  • the network device After the network device receives the 2-step RA MsgA preamble sent by the terminal device, if it correctly parses the data part of the MsgA. If the MsgA data includes CCCH SDU, such as RRCSetupRequest, RRCReestablishmentRequest, RRCSystemInfoRequest, RRCResumeRequest messages, the network device sends the random access response indication information and the second random access response (ie 2-step RA MsgB) to the terminal device, random access response
  • the indication information is used to instruct the terminal device to receive the second random access response.
  • the second random access response is used to allow the terminal device to perform contention resolution, and at least contains contention resolution information (referred to as first contention resolution information), and the first contention resolution information is the CCCH SDU included in the MsgA data.
  • the network device After the network device receives the 2-step RA preamble of the MsgA sent by the terminal device, if it correctly parses the data part of the MsgA. If the MsgA data contains C-RNTI MAC CE, the network device sends the random access response indication information and the third random access response (ie MsgB of 2-step RA) to the terminal equipment, and the random access response indication information is used to indicate the terminal equipment Receive the third random access response.
  • the third random access response is used to allow the terminal device to perform contention resolution, and contains at least contention resolution information (referred to as second contention resolution information).
  • the second contention resolution information is the C-RNTI MAC CE included in the MsgA data.
  • the foregoing random access response indication information may be physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information may include at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information may include at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; content of the random access response included in the random access response transmission block; and random access The random access response subheader included in the response transport block.
  • MAC CE medium access control unit
  • the foregoing random access response indication information is the foregoing RNTI
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends the PDCCH used to schedule the random access response to the terminal device.
  • the CRC of the PDCCH is scrambled with the second RNTI or the third RNTI; the second RNTI indicates that the random access response is the A second random access response, where the third RNTI indicates that the random access response is the third random access response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the RNTI that scrambles the CRC of the PDCCH.
  • the network device After the network device receives the preamble of the MsgA of the 2-step RA sent by the terminal device, it determines whether it can decode the data part of the MsgA correctly. If the data part of MsgA can be parsed correctly, and the MsgA data carries CCCH SDU, the network device sends a second random access response to the terminal device and uses the second RNTI to scramble the CRC of the PDCCH scheduling MsgB; if MsgA carries CRNTI MAC CE, the network device sends the third random access response to the terminal device and uses the third RNTI to scramble the CRC of the PDCCH of the scheduled MsgB.
  • the processing on the terminal device side will be described in Embodiment 4.
  • the above-mentioned second RNTI and the above-mentioned third RNTI are different from each other, which can be related to the time-frequency resource location and random access response type of the PRACH of the 2-step RA preamble sent by the terminal device, which can be calculated by the following formula obtain:
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_carrier_id+14 ⁇ 80 ⁇ 8 ⁇ 2 ⁇ rar_id
  • s_id (0 ⁇ s_id ⁇ 14) is the number of the first OFDM symbol of PRACH in the slot; t_id (0 ⁇ t_id ⁇ 80) is the first PRACH in the system frame Slot number; f_id (0 ⁇ f_id ⁇ 8) is the resource location index of PRACH in the frequency domain; ul_carrier_id (0 or 1) is the identifier of the uplink carrier that sends the preamble, for example, 0 means normal uplink carrier, 1 represents the supplementary uplink carrier; rar_id is the random access response identifier, for example, 0 represents the second random access response, and 1 represents the third random access response.
  • the third RNTI may also be a C-RNTI, which is consistent with the C-RNTI contained in the data of the first message
  • the second RNTI may also be an RA-RNTI, which is the same as the terminal
  • the time-frequency resource position correlation of the physical random access channel (PRACH) through which the device sends the preamble can be calculated using a formula proposed in the prior art.
  • the network equipment uses the PDCCH scrambled by the RA-RNTI to indicate the second random access response, and the PDCCH scrambled with the C-RNTI to indicate the third random access response.
  • the RNTI indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is the content of the foregoing PDCCH
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the second random access response or the third random access response. Access response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the content in the PDCCH.
  • the first indication information indicates the above-mentioned second random access response or the above-mentioned third random access response mode, which is the same as the first indication information in Embodiment 1 indicating the above-mentioned first random access response or the above-mentioned second random access response.
  • the access response method is similar, so I won't repeat it here.
  • the content of the PDCCH indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is in the format of the foregoing PDCCH
  • sending the random access response indication information by the network device to the terminal device may include:
  • the network device sends the PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in the second format or the third format, and the second format indicates that the random access response is the second random access response.
  • the format indicates that the random access response is the third random access response. Therefore, after receiving the PDCCH, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the format of the PDCCH.
  • the PDCCH format is used to indicate the second random access response and the third random access response, which is the same as the PDCCH format used in Embodiment 1 to indicate the first random access response and the second random access response.
  • the input response method is similar, so I won’t repeat it here.
  • the PDCCH format indicates random access responses containing different contention resolution information.
  • the foregoing random access response indication information is the foregoing MAC CE
  • the network device sending the random access response indication information to the terminal device may include:
  • the random access response transmission block sent by the network device to the terminal device includes the MAC CE, and the MAC CE includes second indication information.
  • the second indication information indicates that the random access response is the second random access response or the above The third random access response. Therefore, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the MAC CE.
  • the second indication information may occupy one bit.
  • the random access response is the second random access response;
  • the value of the second indication information is the second value, for example, when it is 1, the random access response is the third random access response.
  • the aforementioned random access response transmission block may include multiple MAC CEs and random access responses corresponding to each MAC CE, where each MAC CE is immediately followed by its corresponding random access response.
  • the second indication information is used to indicate the second random access response and the third random access response, which is the same as the second indication information used in the first embodiment to indicate the first random access response and the second random access response.
  • the access response method is similar, so I won't repeat it here.
  • the MAC CE indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is the content of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the content of the random access response sent by the network device to the terminal device includes third indication information indicating that the random access response is the second random access response or the third random access response. Therefore, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the content contained in the random access response.
  • the third indication information may occupy one bit.
  • the value of the third indication information is a third value, for example, 0, the random access response is the second random access response;
  • the value of the third indication information is a fourth value, for example, when it is 1, the random access response is the third random access response.
  • the third indication information is used to indicate the second random access response and the third random access response, which is the same as the third indication information used in Embodiment 1 to indicate the first random access response and the second random access response.
  • the access response method is similar, so I won't repeat it here.
  • the content of the random access response indicates the random access response containing different contention resolution information.
  • the foregoing random access response indication information is a subheader of the foregoing random access response
  • sending the random access response indication information by the network device to the terminal device may include:
  • the subheader of the MAC layer sub-PDU of the random access response sent by the network device to the terminal device contains fourth indication information, which indicates that the random access response is the second random access response or the first random access response. 3. Random access response. Therefore, the terminal device can determine whether the random access response is the second random access response or the third random access response according to the subheader of the random access response.
  • the aforementioned subheader can occupy 2 bytes, and the aforementioned fourth indication information can occupy one bit.
  • the aforementioned random access response is The second random access response; when the value of the fourth indication information is a sixth value, such as 1, the random access response is the third random access response.
  • the fourth indication information is used to indicate the second random access response and the third random access response, which is the same as the fourth indication information used in the first embodiment to indicate the first random access response and the second random access response.
  • the access response method is similar, so I won't repeat it here.
  • the random access response containing different contention resolution information is indicated through the subheader of the random access response.
  • the network device indicates the random access response containing different contention resolution information by sending random access response indication information to the terminal device.
  • the terminal device can correctly perform contention resolution, and then correctly perform subsequent Random access process.
  • This embodiment provides a method for receiving a random access response, which is applied to a terminal device, which is a processing on the terminal device side corresponding to the method in Embodiment 3, and the same content as in Embodiment 3 will not be repeated.
  • FIG. 21 is a schematic diagram of a method for receiving a random access response in this embodiment. As shown in FIG. 21, the method includes:
  • Step 2101 Send a first message to a network device, where the first message includes a random access preamble and data;
  • Step 2102 Receive random access response and random access response indication information sent by the network device
  • Step 2103 Determine, according to the random access response indication information, that the random access response is a second random access response or a third random access response; the second random access response carries at least information specific to the first message The first contention resolution information for the data of the first message, and the third random access response carries at least the second contention resolution information for the data of the first message.
  • the content of the MsgA data sent by the terminal device may be different at different stages. After the network device decodes the MsgA data correctly, it is based on the content of the MsgA data. , Send to the terminal equipment a random access response (MsgB) containing different contention resolution information and random access response indication information for indicating the random access response, the terminal equipment can distinguish the received random access response The contention resolution information, so as to correctly execute the follow-up.
  • MsgB random access response
  • the terminal device After the terminal device sends the preamble of the MsgA of 2-step RA, it determines whether the random access response indication information indicates the second random access response or the third random access response. If the previously sent MsgA data contains CCCH SDU, and the network device indicates the second random access response, the terminal device determines whether the contention resolution is successful according to the contention resolution information in the second random access response; if the second random access The contention resolution information in the response matches the CCCH SDU included in the MsgA data, and the terminal device determines that the contention resolution is successful, otherwise it fails.
  • the terminal device determines whether the contention resolution is successful according to the contention resolution information in the third random access response; if the third The contention resolution information in the random access response matches the C-RNTI MAC CE included in the MsgA data, and the terminal device determines that the contention resolution is successful, otherwise it fails.
  • the foregoing random access response indication information may be physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information may include at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response And the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information may include at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; content of the random access response included in the random access response transmission block; and random access The random access response subheader included in the response transport block.
  • MAC CE medium access control unit
  • the foregoing random access response indication information is the foregoing RNTI; the terminal device may receive the PDCCH sent by the network device; if the received CRC of the PDCCH is scrambled by the second RNTI, the terminal device determines the The random access response is the foregoing second random access response; if the received CRC of the PDCCH is scrambled by a third RNTI, the terminal device determines that the random access response is the foregoing third random access response.
  • the terminal device After the terminal device sends the preamble of the MsgA of the 2-step RA, it judges the type of random access response received according to the reception of the PDCCH. If the terminal device receives the PDCCH scrambled by the second RNTI and one of the MAC subPDUs in the TB indicated by the PDCCH contains the preamble identifier that matches the transmitted 2-step RACH preamble, the terminal device determines that the TB contains the second Random access response.
  • the terminal device determines that the TB contains the third Random access response.
  • the above-mentioned second RNTI and the above-mentioned third RNTI are different from each other, and are related to the PRACH time-frequency resource position and random access response type of the 2-step RA preamble sent by the terminal device, which can be calculated by the following formula :
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_carrier_id+14 ⁇ 80 ⁇ 8 ⁇ 2 ⁇ rar_id
  • s_id (0 ⁇ s_id ⁇ 14) is the number of the first OFDM symbol of PRACH in the slot; t_id (0 ⁇ t_id ⁇ 80) is the first PRACH in the system frame Slot number; f_id (0 ⁇ f_id ⁇ 8) is the resource location index of PRACH in the frequency domain; ul_carrier_id (0 or 1) is the identifier of the uplink carrier that sends the preamble, for example, 0 means normal uplink carrier, 1 represents the supplementary uplink carrier; rar_id is the random access response identifier, for example, 0 represents the second random access response, and 1 represents the third random access response.
  • the third RNTI may also be a C-RNTI, which is consistent with the C-RNTI contained in the data of the first message, and the second RNTI may also be an RA-RNTI, which is the same as the terminal
  • PRACH physical random access channel
  • the terminal device determines to receive the second random Access response: If the terminal receives the PDCCH scrambled by the C-RNTI, the terminal determines that the third random access response is received and the contention resolution is successful.
  • the RNTI indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is the content of the foregoing PDCCH; the terminal device may receive the PDCCH sent by the network device, and the PDCCH includes the first indication information; the terminal device may determine the foregoing random access according to the first indication information.
  • the incoming response is the aforementioned second random access response or the aforementioned third random access response.
  • the content of the PDCCH indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is the format of the foregoing PDCCH; the terminal device may receive the PDCCH sent by the network device; if the received PDCCH is in the second format, it is determined that the foregoing random access response is the foregoing second format. Random access response; if the received PDCCH is in the third format, determine that the random access response is the third random access response.
  • the PDCCH format indicates random access responses containing different contention resolution information.
  • the foregoing random access response indication information is the foregoing MAC CE; the terminal device may receive the random access response transmission block sent by the network device, and the random access response transmission block includes the foregoing MAC CE, and the MAC CE includes Second indication information; the terminal device may determine according to the second indication information that the random access response is the second random access response or the third random access response.
  • the MAC CE indicates a random access response containing different contention resolution information.
  • the foregoing random access response indication information is the content of the foregoing random access response; the terminal device may receive a random access response sent by the network device, and the content of the random access response includes the third indication information; the terminal device It may be determined according to the third indication information that the random access response is the second random access response or the third random access response.
  • the content of the random access response indicates the random access response containing different contention resolution information.
  • the foregoing random access response indication information is the subheader of the foregoing random access response; the terminal device may receive the random access response sent by the network device, and the subheader of the MAC layer subPDU of the random access response includes Fourth indication information; the terminal device may determine according to the fourth indication information that the random access response is the second random access response or the third random access response.
  • the random access response containing different contention resolution information is indicated through the subheader of the random access response.
  • the network device indicates the random access response containing different contention resolution information by sending random access response indication information to the terminal device.
  • the terminal device can correctly perform contention resolution, and then correctly perform subsequent Random access process.
  • This embodiment provides a random access response sending device, which is configured in a network device. Since the principle of the device to solve the problem is similar to the method of embodiment 1, its specific implementation can refer to the method of embodiment 1, and the same contents will not be repeated.
  • FIG. 22 is a schematic diagram of a random access response sending apparatus 2200 of this embodiment. As shown in FIG. 22, the apparatus includes: a receiving unit 2201 and a sending unit 2202.
  • the receiving unit 2201 is configured to receive a first message sent by a terminal device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble; the sending unit 2202 is configured to send The terminal device sends random access response indication information and a random access response; the random access response indication information indicates that the random access response is a first random access response or a second random access response, and the first The random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution information for the data of the first message.
  • the random access response indication information indicates that the random access response is the first random access response or the second random access response.
  • a random access response where the uplink transmission authorization carried in the first random access response is used for the terminal device to retransmit the data of the first message.
  • the random access response indication information indicates that the random access response is the first random access response, and the first random access response
  • the uplink transmission authorization carried in the access response is used by the terminal device to send new data.
  • the random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) used to schedule the random access response; The content of the PDCCH of the random access response; the format of the PDCCH of the random access response.
  • RNTI radio network temporary identifier
  • the random access response indication information is the RNTI
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH used to schedule the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with the first RNTI or the second RNTI; the first RNTI indicates the The random access response is the first random access response, and the second RNTI indicates that the random access response is the second random access response, so that the terminal device scrambles the CRC of the PDCCH according to the The RNTI determines that the random access response is the first random access response or the second random access response.
  • the random access response indication information is the content of the PDCCH
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the first Random access response or the second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access according to the content in the PDCCH response.
  • the random access response indication information is in the format of the PDCCH, and the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in the first format or the second format, and the first format indicates that the random access response is the A first random access response, and the second format indicates that the random access response is the second random access response, so that the terminal device determines that the random access response is based on the PDCCH format The first random access response or the second random access response.
  • the MAC layer indication information includes at least one of the following: medium access control unit (MAC CE) included in the random access response transmission block; random access included in the random access response transmission block The content of the response; and the subheader of the random access response contained in the random access response transmission block.
  • MAC CE medium access control unit
  • the random access response indication information is the MAC CE
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the random access response transmission block sent by the sending unit 2202 to the terminal device includes the MAC CE, the MAC CE includes second indication information, and the second indication information indicates that the random access response is The first random access response or the second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access response according to the MAC CE Random access response.
  • the second indication information occupies one bit, and when the value of the second indication information is the first value, the random access response is the first random access response; When the value of the second indication information is the second value, the random access response is the second random access response.
  • the random access response transmission block includes multiple MAC CEs and random access responses corresponding to each MAC CE, where each MAC CE is immediately followed by the corresponding random access response .
  • the random access response indication information is the content of the random access response
  • the sending unit 2202 sending the random access response indication information to the terminal device includes:
  • the content of the random access response sent by the sending unit 2202 to the terminal device includes third indication information, and the third indication information indicates that the random access response is the first random access response or The second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access response according to content included in the random access response.
  • the third indication information occupies one bit, and when the value of the third indication information is the third value, the random access response is the first random access response; When the value of the third indication information is the fourth value, the random access response is the second random access response.
  • the random access response indication information is a subheader of the random access response
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit 2202 to the terminal device includes fourth indication information, and the fourth indication information indicates that the random access response is the first A random access response or the second random access response, so that the terminal device determines, according to the subheader of the random access response, that the random access response is the first random access response or The second random access response.
  • the subheader occupies 2 bytes, the fourth indication information occupies one bit, and when the value of the fourth indication information is the fifth value, the random access response is the A first random access response; when the value of the fourth indication information is a sixth value, the random access response is the second random access response.
  • the random access response is the first random access response, the second random access response, or the third random access response; the random access response indication information also indicates the Whether the random access response is the third random access response, and the third random access response carries at least second contention resolution information for the data of the first message.
  • the random access response indication information is at least one of the following: physical layer indication information; MAC layer indication information; physical layer indication information and MAC layer indication information; and two types of MAC layer indication information.
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends the PDCCH for scheduling the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with a third RNTI; the third RNTI indicates that the random access response is the The third random access response.
  • the random access response indication information is the content of the PDCCH
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes fifth indication information, and the fifth indication information indicates that the random access response is the third Random access response.
  • the random access response indication information is in the format of the PDCCH, and the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is a third format, and the third format is used to indicate that the random access response is the third Random access response.
  • the random access response indication information is the RNTI and the MAC layer indication information
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends the PDCCH used to schedule the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with the fourth RNTI or the fifth RNTI; the fourth RNTI indicates the The random access response is the first random access response, and the fifth RNTI indicates that the random access response is not the first random access response;
  • the sending unit 2202 sends the MAC layer indication information to the terminal device, where the MAC layer indication information is used to indicate the random access
  • the response is the second random access response or the third random access response.
  • the random access response indication information is the content of the PDCCH and the MAC layer indication information
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the content of the PDCCH includes sixth indication information; the sixth indication information indicates whether the random access response is The first random access response;
  • the sending unit 2202 sends the MAC layer indication information to the terminal device, where the MAC layer indication information is used to indicate the random access
  • the response is the second random access response or the third random access response.
  • the random access response indication information is the format of the PDCCH and the MAC layer indication information
  • the sending unit 2202 sends random access response indication information and random access response to the terminal device ,include:
  • the sending unit 2202 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in the fourth format or the fifth format, and the fourth format indicates that the random access response is the A first random access response, where the fifth format indicates that the random access response is not the first random access response;
  • the sending unit 2202 sends the MAC layer indication information to the terminal device, where the MAC layer indication information indicates that the random access response is The second random access response or the third random access response.
  • the random access response indication information is the MAC CE
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the random access response transmission block sent by the sending unit 2202 to the terminal device includes the MAC CE, the MAC CE includes seventh indication information, and the seventh indication information indicates that the random access response is The third random access response.
  • the random access response indication information is the content of the random access response
  • the sending unit 2202 sending the random access response indication information to the terminal device includes:
  • the content of the random access response sent by the sending unit 2202 to the terminal device includes eighth indication information, and the eighth indication information indicates that the random access response is a third random access response.
  • the random access response indication information is a subheader of the random access response
  • the sending unit 2202 sends the random access response indication information to the terminal device, including:
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit 2202 to the terminal device includes ninth indication information, and the ninth indication information indicates that the random access response is the first 3. Random access response.
  • the subheader occupies 2 bytes
  • the ninth indication information occupies two bits
  • the random access response is The first random access response
  • the random access response is the second random access response
  • the random access response is the third random access response.
  • the random access response indication information is a subheader of the random access response and the content of the random access response
  • the sending unit 2202 sends a random access response indication to the terminal device Information, including:
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit 2202 to the terminal device includes tenth indication information, and the tenth indication information indicates whether the random access response is the first A random access response;
  • the content of the random access response includes eleventh indication information, and the eleventh indication information indicates that the random access response is the The second random access response or the third random access response.
  • the random access response indication information is the MAC CE and the content or subheader of the random access response
  • the sending unit 2202 sends the random access response indication information to the terminal device, include:
  • the random access response transmission block sent by the sending unit 2202 to the terminal device includes the MAC CE, the MAC CE includes twelfth indication information, and the twelfth indication information indicates the random access response Whether the first random access response;
  • the content or subheader of the random access response includes thirteenth indication information, and the thirteenth indication information indicates the random access response Is the second random access response or the third random access response.
  • the network device indicates the type of the random access response by sending the random access response indication information to the terminal device. According to this, the terminal device can correctly execute the subsequent random access process.
  • This embodiment provides a random access response receiving apparatus, which is configured in a terminal device. Since the principle of the device to solve the problem is similar to the method of the second embodiment, the specific implementation can refer to the method of the second embodiment, and the same contents will not be repeated.
  • FIG. 23 is a schematic diagram of an apparatus 2300 for receiving a random access response in this embodiment. As shown in FIG. 23, the apparatus includes: a sending unit 2301, a receiving unit 2302, and a determining unit 2303.
  • the sending unit 2301 is configured to send a first message to a network device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • the receiving unit 2302 is configured to receive the network Random access response and random access response indication information sent by the device;
  • the determining unit 2303 is configured to determine whether the random access response is the first random access response or the second random access response according to the random access response indication information
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution information for the data of the first message .
  • the uplink transmission authorization carried in the first random access response is used by the terminal device to retransmit the first message. data.
  • the uplink transmission authorization carried in the first random access response is used for the terminal device to send new data.
  • the random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI; the receiving unit 2302 receives the PDCCH sent by the network device; if the received CRC of the PDCCH is scrambled by the first RNTI, The determining unit 2303 determines that the random access response is the first random access response; if the received CRC of the PDCCH is scrambled by the second RNTI, the determining unit 2303 determines the random access The response is the second random access response.
  • the random access response indication information is the content of the PDCCH; the receiving unit 2302 receives the PDCCH sent by the network device, and the PDCCH includes the first indication information; the determining unit 2303 is based on The first indication information determines that the random access response is the first random access response or the second random access response.
  • the random access response indication information is the format of the PDCCH; the receiving unit 2302 receives the PDCCH sent by the network device; if the received PDCCH is in the first format, the The determining unit 2303 determines that the random access response is the first random access response; if the received PDCCH is in the second format, the determining unit 2303 determines that the random access response is the second Random access response.
  • the random access response indication information is the MAC CE; the receiving unit 2302 receives a random access response transmission block sent by the network device, and the random access response transmission block includes all The MAC CE, the MAC CE includes second indication information; the determining unit 2303 determines according to the second indication information that the random access response is the first random access response or the second random access response.
  • the random access response indication information is the content of the random access response; the receiving unit 2302 receives the random access response sent by the network device, and the content of the random access response includes Third indication information; the determining unit 2303 determines whether the random access response is the first random access response or the second random access response according to the third indication information.
  • the random access response indication information is a subheader of the random access response; the receiving unit 2302 receives the random access response sent by the network device, and the MAC of the random access response
  • the subheader of the layer subPDU includes fourth indication information; the determining unit 2303 determines according to the fourth indication information that the random access response is the first random access response or the second random access response.
  • the random access response is the first random access response, the second random access response, or the third random access response; the random access response indication information also indicates the The random access response is the third random access response, and the third random access response carries at least second contention resolution information for the data of the first message; the terminal device is based on the random access response The indication information determines that the random access response is the third random access response.
  • the random access response indication information is at least one of the following: physical layer indication information; MAC layer indication information; physical layer indication information and MAC layer indication information; and two types of MAC layer indication information.
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI; the receiving unit 2302 receives the PDCCH sent by the network device; if the CRC of the PDCCH is scrambled using the first RNTI, the determining unit 2303 Determine that the random access response is the first random access response; if the CRC of the PDCCH is scrambled with a second RNTI, the determining unit 2303 determines that the random access response is the second random access response If the CRC of the PDCCH is scrambled with a third RNTI, the determining unit 2303 determines that the random access response is the third random access response.
  • the random access response indication information is the content of the PDCCH; the receiving unit 2302 receives the PDCCH sent by the network device, and the PDCCH includes the fifth indication information; if the PDCCH contains the first If the five indication information indicates the third random access response, the determining unit 2303 determines that the random access response is the third random access response.
  • the random access response indication information is the format of the PDCCH; the receiving unit 2302 receives the PDCCH sent by the network device; if the format of the PDCCH is the third format, the determining unit 2303 It is determined that the random access response is the third random access response.
  • the random access response indication information is the RNTI and the MAC layer indication information; the receiving unit 2302 receives the PDCCH and the MAC layer indication information sent by the network device; if the If the CRC of the PDCCH is scrambled using the fourth RNTI, the determining unit 2303 determines that the random access response is the first random access response; if the CRC of the PDCCH is scrambled using the fifth RNTI, the determining unit 2303 The unit 2303 determines that the random access response is the second random access response or the third random access response according to the MAC layer indication information.
  • the random access response indication information is the content of the PDCCH and the MAC layer indication information; the receiving unit 2302 receives the PDCCH and the MAC layer indication information sent by the network device, so The content of the PDCCH includes sixth indication information; if the sixth indication information indicates a first random access response, the determining unit 2303 determines that the random access response is the first random access response; if the If the sixth indication information does not indicate the first random access response, the determining unit 2303 determines that the random access response is the second random access response or the third random access response according to the MAC layer indication information. Random access response.
  • the random access response indication information is the format of the PDCCH and the MAC layer indication information; the receiving unit 2302 receives the PDCCH and the MAC layer indication information sent by the network device; if If the PDCCH is in the fourth format, the determining unit 2303 determines that the random access response is the first random access response; if the PDCCH is in the fifth format, the determining unit 2303 determines according to the MAC The layer indication information determines that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the MAC CE; the receiving unit 2302 receives the MAC CE sent by the network device, and the MAC CE includes seventh indication information; if the If the seventh indication information indicates the third random access response, the determining unit 2303 determines that the random access response is the third random access response.
  • the random access response indication information is the content of the random access response; the receiving unit 2302 receives the random access response sent by the network device, and the content of the random access response includes Eighth indication information; if the eighth indication information indicates a third random access response, the determining unit 2304 determines that the random access response is the third random access response.
  • the random access response indication information is a subheader of the random access response; the receiving unit 2302 receives the random access response sent by the network device, and the MAC of the random access response
  • the subheader of the layer sub-PDU contains ninth indication information; if the ninth indication information indicates the third random access response, the determining unit 2303 determines that the random access response is the third random access response. response.
  • the random access response indication information is the subheader of the random access response and the content of the random access response; the receiving unit 2302 receives the random access response sent by the network device , The subheader of the MAC layer subPDU of the random access response includes tenth indication information, and the content of the random access response includes the eleventh indication information; if the tenth indication information indicates the first random access response , The determining unit 2303 determines that the random access response is the first random access response; if the tenth indication information does not indicate the first random access response, the determining unit 2303 determines The eleventh indication information determines that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the content or subheader of the MAC CE and the random access response; the receiving unit 2302 receives the MAC CE and the random access response,
  • the MAC CE includes twelfth indication information, and the content or subheader of the random access response includes thirteenth indication information; if the twelfth indication information indicates the first random access response, the determining unit 2303 determines that the random access response is the first random access response; if the twelfth indication information does not indicate the first random access response, the determining unit 2303 determines according to the thirteenth indication information
  • the random access response is the second random access response or the third random access response.
  • the network device indicates the type of the random access response by sending the random access response indication information to the terminal device. According to this, the terminal device can correctly execute the subsequent random access process.
  • This embodiment provides a random access response sending device, which is configured in a network device. Since the principle of the device to solve the problem is similar to the method of embodiment 3, the specific implementation can refer to the method of embodiment 3, and the same contents will not be repeated.
  • FIG. 24 is a schematic diagram of an apparatus 2400 for sending a random access response in this embodiment. As shown in FIG. 24, the apparatus includes a receiving unit 2401 and a sending unit 2402.
  • the receiving unit 2401 is configured to receive a first message sent by a terminal device, where the first message includes a random access preamble and data; the sending unit 2402 is configured to send random access response indication information and a random access response to the terminal device ;
  • the random access response indication information indicates that the random access response is a second random access response or a third random access response, and the second random access response carries at least data for the first message First contention resolution information, and the third random access response carries at least second contention resolution information for the data of the first message.
  • the random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the sending unit 2402 sends a PDCCH for scheduling the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with a second RNTI or a third RNTI; the second RNTI indicates the The random access response is the second random access response, and the third RNTI indicates that the random access response is the third random access response, so that the terminal device scrambles the CRC of the PDCCH according to the The RNTI determines that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the content of the PDCCH
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the sending unit 2402 sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the second Random access response or the third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access according to the content in the PDCCH response.
  • the random access response indication information is in the format of the PDCCH
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the sending unit 2402 sends a PDCCH for scheduling the random access response to the terminal device, the PDCCH is in the second format or the third format, and the second format indicates that the random access response is the A second random access response, where the third format indicates that the random access response is the third random access response, so that the terminal device determines that the random access response is based on the format of the PDCCH The second random access response or the third random access response.
  • the random access response indication information is the MAC CE
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the random access response transmission block sent by the sending unit 2402 to the terminal device includes the MAC CE, the MAC CE includes second indication information, and the second indication information indicates that the random access response is The second random access response or the third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access response according to the MAC CE Random access response.
  • the second indication information occupies one bit, and when the value of the second indication information is the first value, the random access response is the second random access response; When the value of the second indication information is the second value, the random access response is the third random access response.
  • the random access response transmission block includes multiple MAC CEs and random access responses corresponding to each MAC CE, where each MAC CE is immediately followed by the corresponding random access response .
  • the random access response indication information is the content of the random access response
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the content of the random access response sent by the sending unit 2402 to the terminal device includes third indication information, and the third indication information indicates that the random access response is the second random access response or The third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access response according to content included in the random access response.
  • the third indication information occupies one bit, and when the value of the third indication information is the third value, the random access response is the second random access response; when the When the value of the third indication information is the fourth value, the random access response is the third random access response.
  • the random access response indication information is a subheader of the random access response
  • the sending unit 2402 sends the random access response indication information to the terminal device, including:
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit 2402 to the terminal device includes fourth indication information, and the fourth indication information indicates that the random access response is the first 2. Random access response or the third random access response, so that the terminal device determines, according to the subheader of the random access response, that the random access response is the second random access response or The third random access response.
  • the subheader occupies 2 bytes, the fourth indication information occupies one bit, and when the value of the fourth indication information is the fifth value, the random access response is the A second random access response; when the value of the fourth indication information is a sixth value, the random access response is the third random access response.
  • the network device indicates the random access response containing different contention resolution information by sending random access response indication information to the terminal device. According to this, the terminal device can correctly perform contention resolution and then correctly perform subsequent Random access process.
  • This embodiment provides a random access response receiving apparatus, which is configured in a terminal device. Since the principle of the device to solve the problem is similar to the method of embodiment 4, the specific implementation can refer to the method of embodiment 4, and the same contents will not be repeated.
  • FIG. 25 is a schematic diagram of an apparatus 2500 for receiving a random access response in this embodiment. As shown in FIG. 25, the apparatus includes: a sending unit 2501, a receiving unit 2502, and a determining unit 2503.
  • the sending unit 2501 is configured to send a first message to a network device, where the first message includes a random access preamble and data; the receiving unit 2502 is configured to receive random access response and random access response indication information sent by the network device.
  • the determining unit 2503 is configured to determine, according to the random access response indication information, that the random access response is a second random access response or a third random access response; the second random access response carries at least the The first contention resolution information of the data of the first message, and the third random access response carries at least the second contention resolution information of the data of the first message.
  • the random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following: a radio network temporary identifier (RNTI) used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response; and the PDCCH for scheduling the random access response Content; and the format of the PDCCH for scheduling the random access response.
  • RNTI radio network temporary identifier
  • the MAC layer indication information includes at least one of the following: a medium access control unit (MAC CE) included in the random access response transmission block; the content of the random access response included in the random access response transmission block; and random access The subheader of the random access response included in the response transport block.
  • MAC CE medium access control unit
  • the random access response indication information is the RNTI; the receiving unit 2502 receives the PDCCH sent by the network device; if the CRC of the received PDCCH is scrambled by the second RNTI, The determining unit 2503 determines that the random access response is the second random access response; if the received CRC of the PDCCH is scrambled by a third RNTI, the determining unit 2503 determines the random access The response is the third random access response.
  • the random access response indication information is the content of the PDCCH; the receiving unit 2502 receives the PDCCH sent by the network device, and the PDCCH includes the first indication information; the determining unit 2503 is based on The first indication information determines that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the format of the PDCCH; the receiving unit 2502 receives the PDCCH sent by the network device; if the received PDCCH is in the second format, the The determining unit 2503 determines that the random access response is the second random access response; if the received PDCCH is in the third format, the determining unit 2503 determines that the random access response is the third Random access response.
  • the random access response indication information is the MAC CE; the receiving unit 2502 receives a random access response transmission block sent by the network device, and the random access response transmission block includes all The MAC CE, the MAC CE includes second indication information; the determining unit 2503 determines according to the second indication information that the random access response is the second random access response or the third random access response.
  • the random access response indication information is the content of the random access response; the receiving unit 2502 receives the random access response sent by the network device, and the content of the random access response includes Third indication information; the determining unit 2503 determines according to the third indication information that the random access response is the second random access response or the third random access response.
  • the random access response indication information is a subheader of the random access response; the receiving unit 2502 receives the random access response sent by the network device, and the MAC of the random access response
  • the subheader of the layer sub-PDU includes fourth indication information; the determining unit 2503 determines according to the fourth indication information that the random access response is the second random access response or the third random access response.
  • the network device indicates the random access response containing different contention resolution information by sending random access response indication information to the terminal device. According to this, the terminal device can correctly perform contention resolution and then correctly perform subsequent Random access process.
  • the embodiment of the present invention also provides a network device, and the network device includes the device described in Embodiment 5 or 7.
  • FIG. 26 is a schematic diagram of an implementation manner of a network device according to an embodiment of the present invention.
  • the network device 2600 may include: a central processing unit (CPU) 2601 and a memory 2602; the memory 2602 is coupled to the central processing unit 2601.
  • the memory 2602 can store various data; in addition, it also stores information processing programs, which are executed under the control of the central processing unit 2601 to receive various information sent by the terminal device and send various information to the terminal device.
  • the function of the device described in embodiment 5 or 7 can be integrated into the central processing unit 2601, and the central processing unit 2601 realizes the function of the device described in embodiment 5 or 7, which is related to embodiment 5. Or the functions of the device described in 7 are incorporated here, and will not be repeated here.
  • the device described in embodiment 5 or 7 can be configured separately from the central processing unit 2601.
  • the device described in embodiment 5 or 7 can be a chip connected to the central processing unit 2601 through the central The processor 2601 is controlled to realize the function of the device described in Embodiment 5 or 7.
  • the network device 2600 may further include: a transceiver 2603, an antenna 2604, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the network device 2600 does not necessarily include all the components shown in FIG. 26; in addition, the network device 2600 may also include components not shown in FIG. 26, and reference may be made to the prior art.
  • the terminal device can correctly execute the subsequent random access process.
  • This embodiment provides a terminal device, which includes the device described in Embodiment 6 or 8.
  • FIG. 27 is a schematic diagram of a terminal device according to an embodiment of the present invention.
  • the terminal device 2700 may include a central processing unit 2701 and a memory 2702; the memory 2702 is coupled to the central processing unit 2701. It is worth noting that this figure is exemplary; other types of structures can also be used to supplement or replace this structure to implement telecommunication functions or other functions.
  • the function of the device described in embodiment 6 or 8 can be integrated into the central processing unit 2701, and the central processing unit 2701 can realize the function of the device described in embodiment 6 or 8, which is related to embodiment 4.
  • the functions of the described device are incorporated here, and will not be repeated here.
  • the device described in embodiment 6 or 8 can be configured separately from the central processing unit 2701.
  • the device described in embodiment 6 or 8 can be configured as a chip connected to the central processing unit 2701.
  • the control of the central processing unit 2701 realizes the functions of the device described in Embodiment 6 or 8.
  • the terminal device 2700 may further include: a communication module 2703, an input unit 2704, an audio processing unit 2705, a display 2706, and a power supply 2707. It is worth noting that the terminal device 2700 does not necessarily include all the components shown in FIG. 27; in addition, the terminal device 2700 may also include components not shown in FIG. 27, and reference may be made to the prior art.
  • the central processing unit 2701 is sometimes called a controller or operating control, and may include a microprocessor or other processor devices and/or logic devices.
  • the central processing unit 2701 receives input and controls each of the terminal equipment 2700. Operation of components.
  • the memory 2702 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable devices. Can store various information, in addition can also store and execute programs related to the information. And the central processing unit 2701 can execute the program stored in the memory 2702 to realize information storage or processing. The functions of other components are similar to the existing ones, so I won't repeat them here.
  • Each component of the terminal device 2700 can be implemented by dedicated hardware, firmware, software, or a combination thereof, without departing from the scope of the present invention.
  • the terminal device can correctly execute the subsequent random access procedure.
  • An embodiment of the present invention also provides a communication system, which includes a network device and a terminal device.
  • the network device is, for example, the network device 2600 described in Embodiment 9
  • the terminal device is, for example, the terminal device 2700 described in Embodiment 10.
  • the terminal device is, for example, a UE served by gNB.
  • the terminal device also includes the conventional composition and functions of the terminal device. As described in Embodiment 10, This will not be repeated here.
  • the network device may be, for example, the gNB in NR, which in addition to the functions of the device described in Embodiment 5 or 7, also includes the regular composition and functions of the network device, as described in Embodiment 9. I will not repeat them here.
  • the terminal device can correctly execute the subsequent random access process.
  • the embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the network device, the program causes the computer to execute the method described in embodiment 1 or 3 in the network device.
  • An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method described in Embodiment 1 or 3 in a network device.
  • the embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the terminal device, the program causes the computer to execute the method described in embodiment 2 or 4 in the terminal device.
  • An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method described in embodiment 2 or 4 in a terminal device.
  • the above devices and methods of the present invention can be implemented by hardware, or by hardware combined with software.
  • the present invention relates to such a computer-readable program, when the program is executed by a logic component, the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods Or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, etc.
  • the present invention also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, and the like.
  • the method/device described in conjunction with the embodiments of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module.
  • These software modules can respectively correspond to the steps shown in the figure.
  • These hardware modules can be implemented by curing these software modules by using a field programmable gate array (FPGA), for example.
  • FPGA field programmable gate array
  • the software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • One or more of the functional blocks and/or one or more combinations of the functional blocks described in the drawings can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in the present invention. ), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof.
  • DSPs digital signal processors
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, or multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • a random access response sending device which is configured in a network device, wherein the device includes:
  • a receiving unit which receives a first message sent by a terminal device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • a sending unit which sends random access response indication information and a random access response to the terminal device; the random access response indication information indicates that the random access response is the first random access response or the second random access
  • the first random access response carries at least the uplink transmission authorization allocated by the network device to the terminal device; the second random access response carries at least the first contention resolution for the data of the first message information.
  • the random access response indication information indicates that the random access response is the first random access response or the second random access response, so The uplink transmission authorization carried in the first random access response is used for the terminal device to retransmit the data of the first message;
  • the random access response indication information indicates that the random access response is the first random access response, and all the information carried in the first random access response is The uplink transmission authorization is used for the terminal device to send new data.
  • random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • the physical layer indication information includes at least one of the following:
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the sending unit sends a PDCCH used to schedule the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with a first RNTI or a second RNTI; the first RNTI indicates the random The access response is the first random access response, and the second RNTI indicates that the random access response is the second random access response, so that the terminal device scrambles the CRC of the PDCCH according to the RNTI It is determined that the random access response is the first random access response or the second random access response.
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the first random access response.
  • the access response or the second random access response enables the terminal device to determine that the random access response is the first random access response or the second random access response according to the content in the PDCCH .
  • the sending unit sends a PDCCH used to schedule the random access response to the terminal device, where the PDCCH is in the first format or the second format, and the first format indicates that the random access response is the second format.
  • a random access response, the second format indicates that the random access response is the second random access response, so that the terminal device determines that the random access response is the second random access response according to the format of the PDCCH The first random access response or the second random access response.
  • the MAC layer indication information includes at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the random access response transmission block sent by the sending unit to the terminal device includes the MAC CE, the MAC CE includes second indication information, and the second indication information indicates that the random access response is The first random access response or the second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access response according to the MAC CE Access response.
  • the random access response transmission block includes multiple MAC CEs and random access responses corresponding to each MAC CE, wherein each MAC CE is immediately followed by the random access response. The corresponding random access response.
  • the content of the random access response sent by the sending unit to the terminal device includes third indication information, and the third indication information indicates that the random access response is the first random access response or the A second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access response according to content included in the random access response.
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit to the terminal device includes fourth indication information, and the fourth indication information indicates that the random access response is the first Random access response or the second random access response, so that the terminal device determines that the random access response is the first random access response or the second random access response according to the subheader of the random access response The second random access response.
  • the random access response is the first random access response, the second random access response, or the third random access response; the random The access response indication information also indicates whether the random access response is the third random access response, and the third random access response carries at least second contention resolution information for the data of the first message.
  • random access response indication information is at least one of the following:
  • the physical layer indication information includes at least one of the following:
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the MAC layer indication information includes at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal equipment, and the CRC of the PDCCH is scrambled with a third RNTI; the third RNTI indicates that the random access response is the first 3. Random access response.
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes fifth indication information, and the fifth indication information indicates that the random access response is the third random access response. Access response.
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in a third format, and the third format is used to indicate that the random access response is the third random access response. Access response.
  • the apparatus according to appendix 18, wherein the random access response indication information is the RNTI and the MAC layer indication information, and the sending unit sends random access response indication information to the terminal device, include:
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, and the CRC of the PDCCH is scrambled with a fourth RNTI or a fifth RNTI; the fourth RNTI indicates the random The access response is the first random access response, and the fifth RNTI indicates that the random access response is not the first random access response;
  • the sending unit sends the MAC layer indication information to the terminal device, where the MAC layer indication information is used to indicate the random access response Is the second random access response or the third random access response.
  • the random access response indication information is content of the PDCCH and the MAC layer indication information
  • the sending unit sends a random access response indication to the terminal device Information, including:
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the content of the PDCCH includes sixth indication information; the sixth indication information indicates whether the random access response is the The first random access response;
  • the sending unit sends the MAC layer indication information to the terminal device, where the MAC layer indication information is used to indicate the random access response Is the second random access response or the third random access response.
  • the random access response indication information is a format of the PDCCH and the MAC layer indication information
  • the sending unit sends a random access response indication to the terminal device Information and random access response, including:
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is a fourth format or a fifth format, and the fourth format indicates that the random access response is the first A random access response, where the fifth format indicates that the random access response is not the first random access response;
  • the sending unit sends the MAC layer indication information to the terminal device, and the MAC layer indication information indicates that the random access response is The second random access response or the third random access response.
  • the random access response transmission block sent by the sending unit to the terminal device includes the MAC CE, the MAC CE includes seventh indication information, and the seventh indication information indicates that the random access response is the The third random access response.
  • the content of the random access response sent by the sending unit to the terminal device includes eighth indication information, where the eighth indication information indicates that the random access response is a third random access response.
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit to the terminal device contains ninth indication information, and the ninth indication information indicates that the random access response is the third Random access response.
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit to the terminal device includes tenth indication information, and the tenth indication information indicates whether the random access response is the first Random access response;
  • the content of the random access response includes eleventh indication information, and the eleventh indication information indicates that the random access response is the The second random access response or the third random access response.
  • Access response indication information is the MAC CE and the content or subheader of the random access response
  • the sending unit sends a random access response to the terminal device.
  • Access response indication information including:
  • the random access response transmission block sent by the sending unit to the terminal device includes the MAC CE, the MAC CE includes twelfth indication information, and the twelfth indication information indicates whether the random access response is The first random access response;
  • the content or subheader of the random access response includes thirteenth indication information, and the thirteenth indication information indicates the random access response Is the second random access response or the third random access response.
  • a random access response receiving device configured in a terminal device, wherein the device includes:
  • a sending unit which sends a first message to the network device, where the first message includes a random access preamble and data, or the first message only includes a random access preamble;
  • a receiving unit which receives random access response and random access response indication information sent by the network device
  • a determining unit which determines, according to the random access response indication information, that the random access response is a first random access response or a second random access response; the first random access response carries at least the network device: The uplink transmission authorization allocated by the terminal device; the second random access response carries at least first contention resolution information for the data of the first message.
  • the uplink transmission authorization carried in the first random access response is used for the terminal device to retransmit the data of the first message
  • the uplink transmission authorization carried in the first random access response is used for the terminal device to send new data.
  • random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the MAC layer indication information includes at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines that the random access response is the second random access response.
  • the receiving unit receives a PDCCH sent by the network device, where the PDCCH includes first indication information
  • the determining unit determines whether the random access response is the first random access response or the second random access response according to the first indication information.
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines that the random access response is the second random access response.
  • the receiving unit receives a random access response transmission block sent by the network device, where the random access response transmission block includes the MAC CE, and the MAC CE includes second indication information;
  • the determining unit determines whether the random access response is the first random access response or the second random access response according to the second indication information.
  • the receiving unit receives a random access response sent by the network device, and the content of the random access response includes third indication information;
  • the determining unit determines whether the random access response is the first random access response or the second random access response according to the third indication information.
  • the receiving unit receives a random access response sent by the network device, and the subheader of the MAC layer subPDU of the random access response includes fourth indication information;
  • the determining unit determines whether the random access response is the first random access response or the second random access response according to the fourth indication information.
  • the apparatus determines that the random access response is the third random access response according to the random access response indication information.
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the MAC layer indication information includes at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines that the random access response is the second random access response
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives a PDCCH sent by a network device, where the PDCCH includes fifth indication information;
  • the determining unit determines that the random access response is a third random access response.
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives the PDCCH and the MAC layer indication information sent by the network device;
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines that the random access response is the second random access response or the third random access response according to the MAC layer indication information .
  • the receiving unit receives the PDCCH and the MAC layer indication information sent by the network device, and the content of the PDCCH includes sixth indication information;
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines that the random access response is the second random access response or the first random access response according to the MAC layer indication information 3. Random access response.
  • the random access response indication information is a format of the PDCCH and the MAC layer indication information
  • the receiving unit receives the PDCCH and the MAC layer indication information sent by the network device;
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines whether the random access response is the second random access response or the third random access response according to the MAC layer indication information.
  • the receiving unit receives the MAC CE sent by the network device, where the MAC CE includes seventh indication information;
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives a random access response sent by the network device, and the content of the random access response includes eighth indication information;
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives a random access response sent by the network device, and the subheader of the MAC layer subPDU of the random access response includes ninth indication information;
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives the random access response sent by the network device, the subheader of the MAC layer subPDU of the random access response includes tenth indication information, and the content of the random access response includes eleventh indication information ;
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines, according to the eleventh indication information, that the random access response is the second random access response or the The third random access response.
  • the receiving unit receives the MAC CE and the random access response, where the MAC CE includes twelfth indication information, and the content or subheader of the random access response includes thirteenth indication information;
  • the determining unit determines that the random access response is the first random access response
  • the determining unit determines whether the random access response is the second random access response or the first random access response according to the thirteenth indication information. The third random access response.
  • a random access response sending device configured in a network device, wherein the device includes:
  • a receiving unit which receives a first message sent by a terminal device, the first message including a random access preamble and data;
  • a sending unit which sends random access response indication information and a random access response to the terminal device; the random access response indication information indicates that the random access response is a second random access response or a third random access
  • the second random access response carries at least the first contention resolution information for the data of the first message
  • the third random access response carries at least the second contention resolution information for the data of the first message information.
  • the random access response indication information is physical layer indication information or medium access control (MAC) layer indication information.
  • MAC medium access control
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • the sending unit sends a PDCCH used to schedule the random access response to the terminal device, and the CRC of the PDCCH is scrambled with a second RNTI or a third RNTI; the second RNTI indicates the random The access response is the second random access response, and the third RNTI indicates that the random access response is the third random access response, so that the terminal device scrambles the CRC of the PDCCH according to the RNTI It is determined that the random access response is the second random access response or the third random access response.
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH includes first indication information, and the first indication information indicates that the random access response is the second random access response. Access response or the third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access response according to the content in the PDCCH .
  • the sending unit sends a PDCCH for scheduling the random access response to the terminal device, where the PDCCH is in the second format or the third format, and the second format indicates that the random access response is the first 2.
  • the third format indicates that the random access response is the third random access response, so that the terminal device determines that the random access response is the third random access response according to the format of the PDCCH The second random access response or the third random access response.
  • the random access response subheader included in the random access response transmission block includes
  • the random access response transmission block sent by the sending unit to the terminal device includes the MAC CE, the MAC CE includes second indication information, and the second indication information indicates that the random access response is The second random access response or the third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access response according to the MAC CE Access response.
  • the random access response transmission block includes multiple MAC CEs and random access responses corresponding to each MAC CE, wherein each MAC CE is immediately followed by the random access response. The corresponding random access response.
  • the content of the random access response sent by the sending unit to the terminal device includes third indication information, and the third indication information indicates that the random access response is the second random access response or the A third random access response, so that the terminal device determines that the random access response is the second random access response or the third random access response according to content included in the random access response.
  • the subheader of the MAC layer subPDU of the random access response sent by the sending unit to the terminal device includes fourth indication information, and the fourth indication information indicates that the random access response is the second Random access response or the third random access response, so that the terminal device determines that the random access response is the second random access response or the second random access response according to the subheader of the random access response The third random access response.
  • a random access response receiving device configured in a terminal device, wherein the device includes:
  • a sending unit that sends a first message to the network device, where the first message includes a random access preamble and data;
  • a receiving unit which receives random access response and random access response indication information sent by the network device
  • a determining unit which determines, according to the random access response indication information, that the random access response is a second random access response or a third random access response; the second random access response carries at least information specific to the first random access response; The first contention resolution information of the data of the message, and the third random access response carries at least second contention resolution information for the data of the first message.
  • a radio network temporary identifier used to scramble the CRC of the physical downlink control channel (PDCCH) for scheduling the random access response;
  • MAC layer indication information includes at least one of the following:
  • the random access response subheader included in the random access response transmission block includes
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the second random access response
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives a PDCCH sent by the network device, where the PDCCH includes first indication information
  • the determining unit determines whether the random access response is the second random access response or the third random access response according to the first indication information.
  • the receiving unit receives the PDCCH sent by the network device
  • the determining unit determines that the random access response is the second random access response
  • the determining unit determines that the random access response is the third random access response.
  • the receiving unit receives a random access response transmission block sent by the network device, where the random access response transmission block includes the MAC CE, and the MAC CE includes second indication information;
  • the determining unit determines whether the random access response is the second random access response or the third random access response according to the second indication information.
  • the receiving unit receives a random access response sent by the network device, and the content of the random access response includes third indication information;
  • the determining unit determines whether the random access response is the second random access response or the third random access response according to the third indication information.
  • the receiving unit receives a random access response sent by the network device, and the subheader of the MAC layer subPDU of the random access response includes fourth indication information;
  • the determining unit determines whether the random access response is the second random access response or the third random access response according to the fourth indication information.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des procédés et un appareil permettant de transmettre et de recevoir une réponse d'accès aléatoire, et un système de communication ; le procédé permettant de transmettre une réponse d'accès aléatoire comprend les étapes suivantes : un dispositif de réseau reçoit un premier message envoyé par un dispositif terminal, le premier message contenant un préambule d'accès aléatoire et des données, ou le premier message contenant uniquement un préambule d'accès aléatoire ; et le dispositif de réseau envoie des informations d'indication de réponse d'accès aléatoire et une réponse d'accès aléatoire au dispositif terminal, les informations d'indication de réponse d'accès aléatoire indiquant que la réponse d'accès aléatoire est une première réponse d'accès aléatoire ou une seconde réponse d'accès aléatoire, la première réponse d'accès aléatoire portant au moins une autorisation de transmission de liaison montante attribuée par le dispositif de réseau pour le dispositif terminal, et la seconde réponse d'accès aléatoire portant au moins des premières informations de résolution de contention pour des données du premier message. Ainsi, le dispositif terminal peut distinguer si une réponse d'accès aléatoire reçue est un MsgB de RA en 2 étapes ou un Msg2 de RA en 4 étapes, ce qui permet d'effectuer correctement un processus d'accès aléatoire ultérieur.
PCT/CN2019/077542 2019-03-08 2019-03-08 Procédés et appareil permettant de transmettre et de recevoir une réponse d'accès aléatoire, et système Ceased WO2020181431A1 (fr)

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