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WO2020164141A1 - Procédé et appareil d'envoi et de réception de réponse d'accès aléatoire, et système - Google Patents

Procédé et appareil d'envoi et de réception de réponse d'accès aléatoire, et système Download PDF

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Publication number
WO2020164141A1
WO2020164141A1 PCT/CN2019/075279 CN2019075279W WO2020164141A1 WO 2020164141 A1 WO2020164141 A1 WO 2020164141A1 CN 2019075279 W CN2019075279 W CN 2019075279W WO 2020164141 A1 WO2020164141 A1 WO 2020164141A1
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Prior art keywords
data
random access
message
access response
terminal device
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English (en)
Chinese (zh)
Inventor
路杨
张磊
王昕�
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/CN2019/075279 priority Critical patent/WO2020164141A1/fr
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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 method and orthogonal multiple access technology, the air interface signaling overhead and transmission delay are relatively large; similarly, the business in the uRLLC scenario is mainly periodic or event triggered For small data packets, 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
  • the 2-step random access 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 the unlicensed frequency band business has obvious efficiency improvement. 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.
  • the MsgA message sent by the terminal device in the first step includes the preamble and data.
  • the demodulation of different PUSCH data based on the demodulation reference signal (DMRS, Demodulation Reference Signal) on the resource, so the network equipment can successfully demodulate the preamble, but the PUSCH data demodulation fails, which affects the random access Success rate.
  • DMRS demodulation reference signal
  • Demodulation Reference Signal Demodulation Reference Signal
  • 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 wherein the method includes:
  • the network device receives a first message sent by the terminal device, where the first message includes a random access preamble and data;
  • the network device If the network device demodulates the random access preamble of the first message, but cannot demodulate the data of the first message, the network device sends a first random access response to the terminal device
  • the first random access response carries at least an uplink transmission authorization and a sending time advance command allocated to the terminal device by the network device for retransmitting the data of the first message;
  • the network device receives the retransmission of the data of the first message sent by the terminal device.
  • a method for receiving a random access response wherein the method includes:
  • the terminal device sends a first message to the network device, where the first message includes a random access preamble and data;
  • the terminal device receives the random access response sent by the network device, and if the received random access response is a first random access response, the terminal device performs an uplink message carried in the first random access response.
  • the data of the first message is retransmitted in the resource indicated by the transmission authorization; wherein, the first random access response at least carries the uplink transmission authorization and the transmission time advance command.
  • 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, the first message including a random access preamble and data;
  • the sending unit if the network device demodulates the random access preamble of the first message, but cannot demodulate the data of the first message, the sending unit sends the first random access preamble to the terminal device.
  • An access response where the first random access response carries at least an uplink transmission authorization and a sending time advance command allocated to the terminal device by the network device for retransmitting the data of the first message;
  • the receiving unit receives the retransmission of the data of the first message sent by the terminal device.
  • 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 a random access response sent by the network device, and if the received random access response is a first random access response, the sending unit is configured to perform the uplink operation carried in the first random access response
  • the data of the first message is retransmitted in the resource indicated by the transmission authorization; wherein, the first random access response at least carries the uplink transmission authorization and the transmission time advance command.
  • a network device wherein the network device includes the device described in the foregoing third aspect.
  • a terminal device wherein the terminal device includes the apparatus described in the foregoing fourth aspect.
  • a communication system includes the network device described in the fifth aspect and the terminal device described in the sixth aspect.
  • a computer-readable program wherein when the program is executed in a network device, the program causes the computer to execute the method described in the first aspect in the network device .
  • a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method described in the foregoing first aspect in a network device.
  • a computer-readable program wherein when the program is executed in a terminal device, the program causes the computer to execute the method described in the foregoing second aspect in the terminal device .
  • 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 in a terminal device.
  • the beneficial effects of the embodiments of the present invention are: according to at least one aspect of the embodiments of the present invention, when the network device successfully demodulates the random access preamble of the first message, but the data demodulation of the first message fails, It is possible to roll back from the 2-step contention-based random access failure process to the 4-step contention-based random access to avoid interruption of the 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
  • Embodiment 4 is a schematic diagram of a method for sending a random access response in Embodiment 1;
  • FIG. 5 is a schematic diagram of an example of interaction between terminal equipment and network equipment
  • Figure 6 is a schematic diagram of another example of interaction between a terminal device and a network device
  • FIG. 7 is a schematic diagram of another example of interaction between a terminal device and a network device
  • Fig. 8 is a schematic diagram of another example of interaction between a terminal device and a network device
  • Embodiment 9 is a schematic diagram of a method for receiving a random access response in Embodiment 2.
  • FIG. 10 is a schematic diagram of an example data structure of a random access response
  • FIG. 11 is a schematic diagram of a data structure of another example of a random access response
  • FIG. 12 is a schematic diagram of another example data structure of a random access response
  • FIG. 13 is a schematic diagram of a random access response sending device of Embodiment 3.
  • FIG. 14 is a schematic diagram of a random access response receiving apparatus of Embodiment 4.
  • FIG. 15 is a schematic diagram of a network device of Embodiment 5.
  • FIG. 16 is a schematic diagram of a terminal device of Embodiment 6.
  • 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 method.
  • the first step is that the terminal device selects the CBRA preamble, and the contention-based random access opportunity (RO, Random The preamble (Msg1) is sent in access Occasion);
  • the network device will send a random access response (RAR, Random Access Response) (Msg2) after receiving the preamble, authorizing a dedicated uplink resource for the terminal device that sends the preamble (Such as PUSCH resource) and allocate a temporary CRNTI (TC-RNTI) to indicate the uplink advance of PUSCH;
  • the terminal device sends a message (msg3) carrying signaling or data on the PUSCH resource;
  • the fourth step if After successfully receiving msg3, the network device sends contention resolution signaling (msg4) for the msg3 to the terminal device.
  • FIG 3 is a schematic diagram of a 2-step random access method.
  • the first step is that the terminal device sends MsgA.
  • MsgA contains the CBRA preamble and data part (MsgA signaling or service data).
  • the terminal equipment can send the preamble of MsgA in the competing RO and the signaling or service data of MsgA in the competing PUSCH resource;
  • the network device sends MsgB after receiving MsgA, and sends random access to the terminal device through the MsgB.
  • the terminal device can transmit without uplink scheduling during the random access process, and upload signaling or service packets in one step, reducing random access signaling and delay.
  • the network equipment can demodulate 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 related to the sequence index used by the MsgA preamble sent by the terminal device
  • the network device can obtain the DMRS corresponding to the preamble sequence index according to the preamble demodulated in the RO resource.
  • the network device can demodulate the MsgA data according to the DMRS corresponding to the preamlbe sequence index.
  • the network device can successfully demodulate the MsgA preamble, but the demodulation of the MsgA data fails.
  • Fig. 4 is a schematic diagram of a method for sending a random access response in this embodiment. Please refer to Fig. 4, the method includes:
  • Step 401 The network device receives a first message sent by a terminal device, where the first message includes a random access preamble and data;
  • Step 402 If the network device demodulates the random access preamble of the first message, but cannot demodulate the data of the first message, the network device sends the first random access preamble to the terminal device.
  • An access response where the first random access response carries at least an uplink transmission authorization and a sending time advance command allocated to the terminal device by the network device for retransmitting the data of the first message;
  • Step 403 The network device receives the retransmission of the data of the first message sent by the terminal device.
  • the foregoing first message may also be called a random access request, which may be MsgA in a 2-step random access process, as shown in FIG. 3, the foregoing random access preamble is the one in FIG. preamble, the above data is the payload in Figure 3.
  • a random access request which may be MsgA in a 2-step random access process
  • the foregoing random access preamble is the one in FIG. preamble
  • the above data is the payload in Figure 3.
  • the network device may send a random access response (referred to as the first message) to the terminal device.
  • Random access response which is different from the random access response carried in MsgB of the 2-step random access mode.
  • the first random access response is similar to the random access response carried in Msg2 of the 4-step random access mode. It does not carry contention resolution information, but only carries the uplink transmission authorization assigned by the network device to the terminal device and the sending time advance command. Therefore, the terminal device can fall back from the 2-step random access process to the 4-step random access process, which avoids Interruption of the random access process.
  • the network device can send The terminal device sends a random access response (referred to as the second random access response), which is similar to the random access response carried by MsgB in the 2-step random access method.
  • the second random access response carries at least the second random access response.
  • the contention resolution information of the data of a message and the TC-RNTI allocated by the network equipment to the terminal equipment.
  • the terminal device can determine whether the contention resolution is successful according to the contention resolution information.
  • the second random access response may also carry a transmission time advance command for the terminal device to send uplink data, and the terminal device may adjust the data transmission advance according to the transmission time advance command.
  • the network device after receiving the retransmission of the data of the first message, the network device sends a third random access response to the terminal device if it can demodulate the data of the first message according to the retransmission of the data of the first message.
  • the third random access response at least carries contention resolution information for the data of the first message.
  • FIG. 5 is a schematic diagram of an example of interaction between a terminal device and a network device.
  • the terminal device sends a first message containing a random access preamble and data to the network device (S501), and the network device is demodulating
  • the first random access response is sent to the terminal device (S502), and the terminal device sends the repetition of the data of the first message according to the first random access response.
  • the network device sends a third random access response to the terminal device in the case of demodulating the data of the first message according to the retransmission of the data of the first message (S504).
  • the random access preamble of the first message can be sent in a pre-configured physical random access channel opportunity (PRACH occasion), and the PRACH occasion has a mapping relationship with one or more uplink transmission resources.
  • the data of a message can be sent in a pre-configured uplink transmission resource that has a mapping relationship with the PRACH occasion.
  • the system can preset rules to enable the terminal device to determine the uplink transmission resource used to send the data part of the first message. For example, the terminal device can send the preamble according to the PRACH occasion and the preamble The sequence index uniquely determines the uplink transmission resource.
  • the PDCCH of the first random access response can be addressed to the random access radio network temporary identifier (RA-RNTI).
  • RA-RNTI random access radio network temporary identifier
  • the terminal device After receiving the PDCCH addressed to the RA-RNTI, the terminal device can The foregoing first random access response is received in the downlink authorized resource indicated in the PDCCH.
  • the medium access control (MAC) layer subheader of the transmission block scheduled by the PDCCH may contain identification information matching the random access preamble sequence of the first message, and the terminal device may determine success accordingly. Receive the first random access response.
  • MAC medium access control
  • the above-mentioned RA-RNTI may correspond to the time and frequency position of the above-mentioned PRACH occasion.
  • the existing standards can be referred to, and this embodiment does not limit this.
  • the network device may also schedule the terminal device to send the first message Automatic retransmission of mixed data.
  • the network device can send a hybrid automatic repeat request (HARQ) NACK signaling (called the first HARQ NACK signaling) to the terminal device to schedule the terminal.
  • HARQ NACK signaling a hybrid automatic repeat request (HARQ) NACK signaling
  • the device sends the first HARQ retransmission of the data for the first message, where the first HARQ NACK signaling can be through radio resource control (RRC) layer message, medium access control (MAC) layer signaling, or physical layer signaling (Such as PDCCH) sent.
  • RRC radio resource control
  • MAC medium access control
  • PDCCH physical layer signaling
  • the network device If the number of first HARQ retransmissions of the data of the first message reaches a preset threshold (referred to as the first threshold), and the network device still has not demodulated the data of the first message, the network device sends the terminal device Sending the first random access response.
  • the subsequent process is the same as the foregoing process of directly sending the first random access response, and the description is omitted here.
  • the network device may send a random access to the terminal device.
  • Incoming response (referred to as the fourth random access response)
  • the fourth random access response can carry the same content as the random access response carried by MsgB in the 2-step random access mode, and it carries at least the content for the first random access response.
  • the contention resolution information of the data of the message can determine whether the contention resolution is successful according to the contention resolution information.
  • the fourth random access response may also carry the TC-RNTI allocated by the network device to the terminal device. If the contention is resolved successfully, the terminal device may set the TC-RNTI as the used C-RNTI. In addition, in this example, the fourth random access response may also carry a transmission time advance command for the terminal device to send uplink data, and the terminal device may adjust the data transmission advance according to the transmission time advance command.
  • Fig. 6 is a schematic diagram of another example of interaction between a terminal device and a network device.
  • the terminal device sends a first message to the network device (S601), and the network device demodulates the first message. If the random access preamble of the message is not demodulated, but the data of the first message is not demodulated, the first HARQ NACK signaling is sent to the terminal device (S602), and the terminal device performs the data of the first message accordingly.
  • the first HARQ retransmission (S603), the network device sends the first random access response to the terminal device when the number of times of the first HARQ retransmission reaches the first threshold and the data of the first message is not demodulated.
  • the terminal device may retransmit the data of the first message (S605), and the network device may decode the data of the first message.
  • the network device correctly demodulates the data according to the retransmission of the first message, it sends a third random access response to the terminal device (S606).
  • Fig. 7 is a schematic diagram of another example of interaction between a terminal device and a network device.
  • the difference from Fig. 6 is that the network device demodulates the first HARQ retransmission number before the first threshold.
  • the foregoing fourth random access response is sent to the terminal device.
  • the terminal device sends a first message to the network device (S701).
  • the network device demodulates the random access preamble of the first message, but does not demodulate the first message.
  • the first HARQ NACK signaling is sent to the terminal device (S702), and the terminal device performs the first HARQ retransmission for the data of the first message accordingly (S703), and the network device transmits the data in the first HARQ Before the number of retransmissions reaches the first threshold, the data of the first message is demodulated, and the fourth random access response is sent to the terminal device (S704), and the terminal device can determine whether the contention resolution is successful.
  • the network device may clear the buffer area used for soft-combining the data of the first message, and when the first message is received When the data is retransmitted, the retransmitted data is used to decode the data of the first message; or, the network device may not clear the buffer area used for soft combining and decoding the data of the first message.
  • the data of the first message is retransmitted, the data of the first message is soft-combined and decoded using the data of the buffer and the retransmitted data.
  • the network device still The terminal device may be scheduled to send a hybrid automatic retransmission for the retransmission of the data of the first message.
  • the network device may send a hybrid automatic repeat request (HARQ) NACK signaling (referred to as second HARQ NACK signaling) to the terminal device, and schedule the terminal device to send a second HARQ retransmission for the data of the first message
  • HARQ NACK signaling may be sent through radio resource control (RRC) layer messages, medium access control (MAC) layer signaling, or physical layer signaling (such as PDCCH).
  • RRC radio resource control
  • MAC medium access control
  • PDCCH physical layer signaling
  • the network device demodulates the data of the first message, then the network device can send the data to the terminal device Send a random access response (referred to as the fifth random access response), the fifth random access response may be the same as the content carried in the third random access response, and it carries at least the contention for the data of the first message Resolution information.
  • the fifth random access response is similar to the random access response carried in Msg4 of the 4-step random access mode, and it at least carries contention resolution information for the data of the first message, and accordingly, the terminal device can resolve the contention according to the contention resolution. The information determines whether the contention resolution is successful, which will be described in Embodiment 2. This completes the random access process.
  • Fig. 8 is a schematic diagram of another example of interaction between the terminal device and the network device.
  • the terminal device sends a first message to the network device (S801), and the network device demodulates the first message. If the random access preamble of a message is not demodulated, the first random access response is directly sent to the terminal device (S802). After that, the terminal device may retransmit the data of the first message (S803), and the network device decodes the data of the first message.
  • the network device still cannot demodulate the data of the first message, and sends the second HARQ NACK signaling to the terminal device, as shown in S804 in Figure 8, to schedule the terminal device to send The second HARQ retransmission of the data of the first message, and then the terminal device performs the second HARQ retransmission of the data of the first message (S805).
  • the network device demodulates the data of the first message, and the network device may send a fifth random access response to the terminal device (S806).
  • the foregoing third random access response may also carry the C-RNTI allocated to the terminal device.
  • the PDCCH of the third random access response may be addressed to RA-RNTI, and the MAC layer subheader of the transport block scheduled by the PDCCH may contain identification information matching the random access preamble of the first message; wherein, the The random access preamble of the first message is sent in the pre-configured PRACH occasion, and the above-mentioned RA-RNTI corresponds to the time and frequency position of the PRACH occasion.
  • the terminal device can receive the PDU of the MAC layer random access response (the third random access response) in the downlink authorized resource indicated by the PDCCH.
  • the above-mentioned first random access response may also carry the TC-RNTI allocated by the network device to the terminal device. Therefore, the terminal device may use the TC-RNTI to scramble data and scramble according to the aforementioned
  • the sending time advance command adjusts the data sending advance amount, which will be specifically described in Embodiment 2.
  • the PDCCH of the third random access response can be addressed to the radio network temporary identity (C-RNTI); the C-RNTI matches the aforementioned first random access
  • the terminal device may receive the third random access response in the downlink authorized resource indicated by the PDCCH.
  • the third random access response may also carry the uplink transmission authorization and transmission time advance command allocated by the network device to the terminal device, and the terminal device may advance the transmission time according to the transmission time. Command to adjust the data sending advance, and send the uplink data on the resource indicated by the uplink transmission authorization.
  • the 2-step random access process if the network device successfully demodulates the random access preamble (MsgA preamble) of the first message, but the data (MsgA payload) of the first message is demodulated In the case of failure, the 2-step random access process can be rolled back to the 4-step random access process, avoiding the interruption of the 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. 9 is a schematic diagram of a method for receiving a random access response in this embodiment. As shown in FIG. 9, the method includes:
  • Step 901 The terminal device sends a first message to the network device, where the first message includes a random access preamble and data;
  • Step 902 The terminal device receives a random access response sent by the network device
  • Step 903 If the received random access response is a first random access response, the terminal device retransmits the first message in the resource indicated by the uplink transmission authorization carried in the first random access response Data; wherein, the first random access response carries at least the uplink transmission authorization and transmission time advance command.
  • the definitions of the above-mentioned first message and the above-mentioned first random access response are the same as in Embodiment 1.
  • the above-mentioned first message is, for example, steps S501, S601, S701, and S801 shown in FIGS. 5-8.
  • the first random access response is, for example, step S502 shown in FIG. 5, or step S604 shown in FIG. 6, or S802 shown in FIG. 8, and the description is omitted here.
  • the terminal device when the terminal device sends the above-mentioned first message (steps S501, S601, S701, and S801 as shown in Figure 5-8) to the network device for 2-step random access, if it receives To the first random access response (step S502 shown in FIG. 5 or step S604 shown in FIG. 6 or step S802 shown in FIG. 8) sent by the network device, the terminal device returns from the 2-step random access process Back to the 4-step random access process to avoid the interruption of the random access process.
  • the terminal device judges whether or not according to the contention resolution information carried in the second random access response The contention resolution is successful; wherein, the second random access response carries at least the contention resolution information for the data of the first message and the TC-RNTI allocated by the network device to the terminal device, and the terminal device can be based on the aforementioned contention
  • the resolution information determines whether the competition resolution is successful. If the terminal determines that the contention resolution is successful, it can use TC-RNTI as the C-RNTI used by itself.
  • the second random access response may also carry a transmission time advance command for the terminal to send uplink data, and the terminal device may adjust the data transmission advance according to the transmission time advance command. Further, the second random access response may also carry an uplink authorization for the terminal to send uplink data.
  • the network device further The data of the first message is decoded. If the network device can demodulate the data of the first message according to the retransmission of the data of the first message, the network device may send a third random access response to the terminal device (step S504, step S606), where the The third random access response carries at least contention resolution information for the data of the first message, and the terminal device determines whether the contention resolution is successful according to the contention resolution information. For details, refer to step S504 in FIG. 5 and step 606 in FIG. 6.
  • the terminal device can send the random access preamble of the first message in the pre-configured PRACH occasion And, the terminal device may determine the uplink transmission resource for sending the data of the first message according to the PRACH occasion, or determine the uplink resource for sending the data of the first message according to the PRACH occasion and the random access preamble of the first message , And send the data of the first message on the determined uplink transmission resource.
  • the PDCCH of the first random access response sent by the network device can be addressed to RA- RNTI
  • the MAC layer subheader of the transmission block scheduled by the PDCCH may include identification information matching the random access preamble of the first message, and thus, the terminal device may determine that the first random access response is successfully received.
  • the above-mentioned RA-RNTI may correspond to the time and frequency position of the above-mentioned PRACH occasion.
  • the existing standards can be referred to, and this embodiment does not limit this.
  • the network device may send the first HARQ NACK signaling to the terminal device (step S602, step 702), and the terminal device may be scheduled to send the first HARQ retransmission of the data of the first message.
  • the terminal device may also receive The first HARQ NACK signaling sent by the network device (step S602, step 702), the first HARQ NACK signaling is used to schedule the first HARQ retransmission for the data of the first message; if the first message is If the number of first HARQ retransmissions of data does not reach the first threshold, the terminal device can continue to send the first HARQ retransmission of the data of the first message to the network device (step 603, step 703).
  • the processing of the network device has been described in Embodiment 1, and will not be repeated here.
  • the network device may send the first message to the terminal device.
  • a random access response (step S604).
  • the first random access response carries at least an uplink transmission authorization and a transmission time advance command, and the terminal device retransmits the first random access response from the resources indicated by the uplink transmission authorization carried in the first random access response.
  • the data of a message is not limited to Embodiment 1, as shown in FIG. 6, if the network device still does not demodulate the data of the first message according to the first HARQ retransmission.
  • the network device may send a fourth random access response to the terminal device (step S704), and the fourth random access response at least carries information for all
  • the terminal device judges whether the contention resolution is successful according to the contention resolution information carried in the fourth random access response.
  • the terminal device may use the data in the data transmission buffer of the first message to retransmit the data of the first message, that is, use the data in the data transmission buffer of the first message to perform the first HARQ retransmission; or, the MAC layer encapsulation and grouping entity of the terminal device regenerates the data of the first message, and the terminal device puts the re-uploaded data of the first message into the data transmission buffer of the first message and sends .
  • the terminal device may use the data in the data transmission buffer of the first message to retransmit the data of the first message, that is, use the data in the data transmission buffer of the first message to perform the first HARQ retransmission; or, the MAC layer encapsulation and grouping entity of the terminal device regenerates the data of the first message, and the terminal device puts the re-uploaded data of the first message into the data transmission buffer of the first message and sends .
  • step S903 when the terminal device retransmits the data of the first message in the resource indicated by the uplink transmission authorization carried in the first random access response, the terminal device may The foregoing transmission time advance command carried in the access response adjusts the uplink transmission time, and uses RA-RNTI to retransmit the data of the first message.
  • the third random access response (S504 shown in FIG. 5 or S606 shown in FIG. 6) sent by the subsequent network device may carry the TC-RNTI allocated by the network device to the terminal device.
  • the PDCCH of the third random access response is also addressed to the RA-RNTI, and the transmission block scheduled by the PDCCH contains identification information matching the random access preamble of the first message; wherein, the RA-RNTI corresponds to the terminal device sending The time and frequency location of the PRACH occurrence of the first message preamble.
  • the foregoing first random access response may carry the TC-RNTI allocated by the network device to the terminal device, and then in step 903, the terminal device may carry the TC-RNTI according to the first random access response.
  • the foregoing sending time advance command adjusts the uplink sending time, and the data of the foregoing first message is retransmitted using the TC-RNTI carried in the first random access response.
  • the PDCCH of the third random access response (S504 shown in FIG. 5 or S606 shown in FIG. 6) sent by the subsequent network device can be addressed to the C-RNTI, which matches the first random access response above
  • the TC-RNTI carried in the, or the C-RNTI matches the C-RNTI MAC CE transmitted in the data of the first message.
  • the network device further performs the The data is decoded. If the network device still cannot demodulate the data of the first message according to the retransmission of the data of the first message, the network device can send the second HARQ NACK signaling to the terminal device (step S804), and the terminal device is scheduled to send The second HARQ retransmission of the data of the first message, in this embodiment, the terminal device may also receive the second HARQ NACK signaling sent by the network device, if the second HARQ retransmission of the data of the first message If the number of times does not reach the second threshold, the terminal device continues to send the second HARQ retransmission of the data of the first message to the network device (step S805).
  • the network device may send the fifth message to the terminal device.
  • Random access response step S806
  • the subsequent terminal device determines whether the contention resolution is successful according to the contention resolution information carried in the fifth random access response, thereby completing the random access process.
  • the terminal device determines whether the contention resolution is successful according to the contention resolution information in the random access response (for example, the second, third, fourth, or fifth random access response), if the contention resolution information matches Based on the data of the first message, the terminal device determines that the contention resolution is successful, and sets the C-RNTI to the TC-RNTI; if the contention resolution information does not match the data of the first message, the terminal device determines that the contention resolution failed, The above-mentioned TC-RNTI is discarded. If the terminal equipment starts the time advance (TA) timer, the TA timer needs to be stopped.
  • TA time advance
  • the 2-step random access process if the network device successfully demodulates the random access preamble (MsgA preamble) of the first message, but the data (MsgA payload) of the first message is demodulated In the case of failure, the 2-step random access process can be rolled back to the 4-step random access process, avoiding the interruption of the random access process.
  • the network device is the gNB and the terminal device is the UE as an example, but as mentioned above, this embodiment is not limited to this.
  • Figure 10 is a schematic diagram of an example data structure of a random access response.
  • the gNB successfully decodes the MsgA preamble on the RO resource used to send the MsgA preamble, but cannot send the MsgA preamble. Successfully demodulate the data of MsgA on the PUSCH resource corresponding to the RO resource.
  • the UE initiates 2-step random access, randomly selects a preamble index in the CBRA preamble, sends the MsgA preamble in the selected RO resource, and sends the MsgA data in the PUSCH resource corresponding to the RO resource.
  • the preamble and data of MsgA can be transmitted simultaneously or sequentially on different time domain resources.
  • the RO resource for sending the MsgA preamble and the PUSCH resource for sending the MsgA data are pre-configured by the system, and there is a mapping relationship between the two resources, and one RO resource corresponds to one or more PUSCH resources.
  • MsgA data can include CCCH SDU or C-RNTI MAC CE, and its meaning can refer to existing standards.
  • the gNB When the gNB receives MsgA, it first demodulates the preamble sent on the RO resource, and obtains the DMRS of the demodulated MsgA data according to the index of the demodulated preamlbe.
  • the DMRS of the MsgA data is distributed in the PUSCH of the MsgA data, and the gNB passes through the MsgA.
  • the DMRS of the data demodulates the MsgA data.
  • the gNB cannot successfully demodulate the data part of MsgA according to the preamble of MsgA.
  • the gNB then sends the first RAR to the UE.
  • the first RAR includes the TAC, the allocated TC-RNTI, and an uplink transmission grant (UL grant) to instruct the UE to fall back to the 4-step RACH process. It does not carry the MAC CE for contention resolution.
  • the MAC layer random access response PDU sent by the gNB is scrambled by RA-RNTI, and the transmitted resource location is indicated by the PDCCH scrambled by RA-RNTI.
  • RA-RNTI is calculated based on the location of the RO resource sending the MsgA preamble.
  • the MAC layer random access response PDU contains MAC subPDU, and the subheader (subHeader) of MAC subPDU contains RAPID, which indicates the index of the preamble sent by the UE and contains 4-step RACH RAR information (E and T shown in Figure 10). , Its meaning can refer to existing standards).
  • the UE starts the 4-step RACH random access response receiving window timer after sending the MsgA preamble, and starts the 2-step random access response receiving window timer after sending the MsgA data and starts to try to receive the MsgB.
  • the UE receives the MAC layer random access response PDU in the downlink authorized resource indicated in the PDCCH. If the RAPID in the subHeader of the MAC SubPDU in the MAC layer random access response PDU is the index of the preamble of the transmitted MsgA, the UE determines that the RAR is successfully received. If the RAR is the first RAR, the UE determines to fall back from 2-step to 4-stepRACH.
  • the UE can perform the third step of 4-step RACH, that is, the UE resends the data part of MsgA in the uplink authorized resource indicated by the RAR, uses the TC-RNTI allocated in the RAR to scramble the data and scrambles the data according to the RAR
  • the TAC adjusts the data transmission advance.
  • the retransmitted MsgA data can use the preset RV version, which can be the same as or different from the original MsgA data, and on the gNB side, Msg3 can be received in soft merge with the initially transmitted data.
  • the UE when the UE sends MsgA data, it can also use the HARQ process or not use the HARQ process. If the HARQ process is used, if the gNB cannot demodulate the MsgA data correctly, the Gnb can send HARQ NACK to the UE. The HARQ retransmission of the data for MsgA is sent. If the maximum number of retransmissions is reached and the data is not received correctly, the first RAR is sent.
  • Figure 11 is a schematic diagram of the data structure of another example of a random access response.
  • two UEs select different preambles when performing 2-step random access, such as preamble index A and B, and Choose to send the preamble on the same RO resource and respectively transmit the MsgA data on the PUSCH resource corresponding to the RO resource.
  • the gNB successfully decodes preamble A and preamble B in the RO, and successfully demodulates the data of MsgA corresponding to preamble B on the PUSCH resource corresponding to the RO resource, but fails to successfully demodulate the data of MsgA corresponding to preamble A.
  • two UEs initiate 2-step random access and randomly select different preamble indexes A and B in the CBRA preamble.
  • the two UEs choose to send the MsgA preamble in the same RO resource, and
  • the data of MsgA is sent in the PUSCH resource corresponding to the RO.
  • the preamble and the data can be transmitted at the same time or sent on different time domain resources one after another.
  • the RO resource for sending the preamble of MsgA and the PUSCH resource for sending the data of MsgA are pre-configured by the system, and there is a mapping relationship between the two resources, and one RO corresponds to one or more PUSCH resources.
  • MsgA data can include CCCH SDU or C-RNTI MAC CE, and its meaning can refer to existing standards.
  • the gNB first demodulates the preamble sent on the RO resource, and obtains the DMRS of the MsgA data of the two UEs according to the demodulated preamlbe index A and B.
  • the DMRS of the MsgA data is distributed in the PUSCH of the MsgA data, and then the DMRS is decoded. Adjust the MsgA data of the two UEs.
  • the gNB successfully demodulates the data of MsgA corresponding to preamble B but fails to demodulate the data of MsgA corresponding to preamble A. After that, the gNB sends RAR to the two UEs.
  • the MAC layer random access response PDU contains two MAC subPDUs.
  • MAC subPDU 2 corresponds to the RAR of the UE that successfully demodulates the MsaA data.
  • the subheader Contains RAPID, which indicates preamble index B, and the payload contains a second RAR used to indicate that the UE sending preamble A succeeds in random access.
  • This second RAR carries contention resolution MAC CE, TC-RNTI allocated by gNB for the UE, and uplink Authorization or timing advance; as shown in Figure 11, MAC subPDU 1 corresponds to the RAR of the UE that failed to demodulate the data of MsaA.
  • the subheader contains RAPID, which indicates preamble index A, and the payload contains the first RAR for Instruct the UE to fall back to the 4-step RACH process.
  • the first RAR carries the TC-RNTI, uplink grant or timing advance allocated by the gNB for the UE, and does not carry the contention resolution MAC CE.
  • the MAC layer random access response PDU sent by the gNB is scrambled by RA-RNTI, and the transmitted resource location is indicated by the PDCCH scrambled by RA-RNTI.
  • RA-RNTI is calculated based on the RO resource location of the preamble that sends the MsgA.
  • the two UEs After the two UEs send the MsgA preamble and receive the PDCCH addressed to the RA-RNTI, they receive the MAC layer random access response PDU in the downlink authorized resource indicated in the PDCCH.
  • RAPID in the subHeader of the sent preamble A is determined to successfully receive the random access response; this MAC SubPDU 1 contains For the first RAR (4-step RAR), the UE determines to fall back from 2-step to 4-step RACH, and in the next step, the UE executes the third step of 4-step RACH, that is, the UE resends the MsgA in the uplink authorized resources indicated by the RAR Use the TC-RNTI allocated in the first RAR (4-step RAR) to scramble the data and adjust the data transmission advance according to the TA in the RAR.
  • the retransmitted MsgA data can use the preset RV version, which can be the same as or different from the initial MsgA data, and on the gNB side, Msg3 can be received in soft merge with the initially transmitted MsgA data.
  • the UE sending the preamble B receives the MAC SubPDU 2 in the MAC layer random access response PDU
  • the RAPID in the subHeader of the preamble B is determined to successfully receive the random access response
  • the MAC SubPDU 2 contains the second RAR (not only the content of 4-step RAR, but also contention resolution MAC CE)
  • the UE determines to continue 2-step random access, and further, the UE starts the TA timer and adjusts the data transmission advance according to the TA in the second RAR.
  • the content of the MAC CE judges whether the contention resolution is successful.
  • the contention resolution and random access are successful, and the allocated TC-RNTI is set as the C-RTNI used. If the content of the MAC CE is inconsistent with the MsgA content, If the contention resolution fails, stop TA timer and ignore the received TC-RNTI.
  • the gNB will not send two RAR formats (ie, 2-step RAR and 4-step RAR) for the same preamble, so the UE can confirm the random access status as long as it receives the RAR.
  • the UE can use HARQ process or not use HARQ process when sending MsgA data. If HARQ process is used, if gNB cannot demodulate MsgA data correctly, it will send HARQ NACK to UE through PDCCH and schedule retransmission. , The UE sends HARQ retransmissions for MsgA data, where the UE can increase the transmission power of the MsgA data HARQ retransmissions according to the preset power step.
  • the gNB will send the first RAR; if Before reaching the maximum number of retransmissions, the gNB successfully demodulates the MsgA, and the gNB sends the second RAR.
  • the HARQ process can also be used to improve the correct rate of data demodulation. If the gNB cannot demodulate the MsgA data correctly, it sends the PDCCH addressed to the TC-RNTI to send HARQ NACK to the UE and schedules the retransmission, and the UE sends the HARQ retransmission of msg3.
  • FIG. 12 is a schematic diagram of another example data structure of a random access response.
  • UE a and UE b select the same preamble during 2-step random access, that is, the preamble index is the same, and Choose to send the preamble on the same RO resource and respectively transmit the MsgA data on the PUSCH resource corresponding to the RO resource.
  • the gNB successfully decoded the preamble from the RO resource and identified two identical preambles. It successfully demodulated the data of MsgA sent by UE a on the PUSCH resource corresponding to the RO resource, but failed to demodulate the data of MsgA sent by UE b. data.
  • UE a and UE b initiate 2-step random access and randomly select the same preamble in the CBRA preamble.
  • the two UEs choose to send the preamble in the same RO resource, and the corresponding RO resource
  • the MsgA data is sent in the PUSCH resource, and the preamble and the data can be transmitted at the same time or sent on different time domain resources one after another.
  • the RO resource for sending the preamble of MsgA and the PUSCH resource for sending the data of MsgA are pre-configured by the system, and there is a mapping relationship between the two resources, and one RO corresponds to one or more PUSCH resources.
  • the gNB first demodulates the preamble sent on the RO resource, and obtains the DMRS of the MsgA data according to the demodulated preambe index.
  • the DMRS of the MsgA data is distributed in the PUSCH of the MsgA data, and then the MsgA data is demodulated through the DMRS.
  • the gNB generally cannot demodulate the MsgA data of two UEs with the same DMRS on the same PUSCH resource.
  • the gNB successfully demodulates the MsgA data of the UE a but fails to demodulate the MsgA data of the UE b.
  • the gNB sends the RAR to the two UEs, sends the second RAR to the UE (UE a) that successfully demodulates the MsgA data, and sends the first RAR to the UE (UE b) that has not decoded the MsgA data.
  • the MAC layer random access response PDU contains two MAC subPDUs.
  • MAC subPDU 1 corresponds to the response of UE a
  • the subheader contains RAPID, which indicates preamble index
  • the payload contains 2-step random access response information (second RAR) to indicate the success of the random access process of UEa.
  • the second RAR carries contention resolution MAC CE, Temporary C-RNTI allocated by gNB to UE, uplink authorization or time Timing advance; as shown in Figure 12, MAC subPDU 2 corresponds to UE b’s MsgB, the subheader contains RAPID, which indicates the preamble index, and the payload contains 4-step random access response information (first RAR) for Instruct the UE b to fall back to the 4-step RACH process.
  • the first RAR carries the Temporary C-RNTI, uplink authorization, or timing advance allocated by the gNB for the UE, but does not carry the contention resolution MAC CE.
  • the MAC layer random access response PDU sent by the gNB is scrambled by RA-RNTI, and the transmitted resource location is indicated by the PDCCH scrambled by RA-RNTI.
  • RA-RNTI is calculated based on the location of the RO resource sending the MsgA preamble.
  • the two UEs start the 4-step RACH random access response receiving window timer after sending the MsgA preamble, and start the 2-step random access response receiving window timer after sending the MsgA data and start trying to receive MsgB.
  • the two UEs receive the PDCCH addressed to the RA-RNTI, they receive the MAC layer random access response PDU in the downlink authorized resource indicated in the PDCCH.
  • the UE a receives the MAC layer random access response PDU.
  • the RAPID in the subHeader of the MAC SubPDU 1 is the transmitted preamble and determines that the random access response is successfully received; the MAC SubPDU 1 contains the 2-step random access response (second RAR ), the UE a adjusts the data transmission advance according to the TA in the second RAR and judges whether the random contention resolution is successful according to the content of the contention resolution MAC CE. If the contention resolution MAC CE is consistent with the sent MsgA data, it is judged as the contention resolution and If the random access is successful, set the allocated TC-RNTI to the used C-RTNI, start the TA timer and use the TA to adjust the data transmission advance.
  • the RAPID in the subHeader of the MAC SubPDU 1 is the transmitted preamble, and determines that it has successfully received the random access response;
  • the MAC SubPDU 1 contains the 2-step random access response (second RAR), the UE starts the TA timer and adjusts the data transmission advance according to the TA in the RAR, and judges whether the random access process is successful according to the content of the contention resolution MAC CE, and the contention resolution MAC CE is inconsistent with the sent MsgA data, the UE discards the allocation TC-RNTI and stop TA timer;
  • the UE also receives a MAC SubPDU 2 whose RAPID matches the transmitted preamble.
  • This MAC SubPDU 2 contains a 4-step RACH RAR (first RAR), and the UE determines to roll back from the 2-step To 4-step RACH, the next step, the UE performs the third step of 4-step RACH, that is, the UE retransmits the MsgA data part in the uplink authorized resource indicated by the RAR, and uses the TC- allocated in the 4-step RAR (first RAR).
  • the RNTI scrambles the data and adjusts the data transmission advance according to the TA in the RAR.
  • the retransmitted MsgA data can use the preset RV version, which can be the same as or different from the initial MsgA data, and on the gNB side, msg3 can be received in soft merge with the initially transmitted MsgA data.
  • the gNB may send two RARs (ie, 2-step RAR and 4-step RAR) for the same preamble, so the UE needs to detect two RARs to confirm the random access state.
  • the gNB can send two RARs for the same preamble in the same random access response MAC PDU.
  • the UE if the UE only receives the first RAR, it will confirm the fallback from 2-step random access to 4-step random access, and retransmit the data of MsgA; if the UE only receives the second RAR, Then, according to the contention resolution MAC CE carried by the second RAR, judge whether the resolution is successful; if the UE receives the first RAR and the second RAR at the same time, the UE judges whether the contention resolution is successful according to the contention resolution MAC CE carried by the second RAR. If the MAC CE and Msg A data are consistent, it is considered that the contention resolution is successful. If they are inconsistent, it is confirmed that the 2-step random access is rolled back to the 4-step random access, the data of MsgA is retransmitted, and the contention resolution is considered to be failed.
  • the UE can use the HARQ process or not use the HARQ process when sending MsgA data. If the HARQ process is used, if the gNB cannot demodulate the MsgA data correctly, it sends HARQ NACK to the UE through the PDCCH and schedules the retransmission. Send HARQ retransmission for MsgA data, where the UE can increase the transmission power of the MsgA data HARQ retransmission according to the preset power step.
  • the gNB will send the first RAR; Before the maximum number of retransmissions, the gNB successfully demodulates MsgA, and the gNB sends the second RAR.
  • the HARQ process can also be used to improve the correct rate of data demodulation. If the gNB cannot demodulate the Msg3 data correctly, it sends the PDCCH addressed to the TC-RNTI to send HARQ NACK to the UE and schedule the retransmission, and the UE sends the HARQ retransmission of the msg3 data. Among them, the UE can increase the transmit power of the Msg3HARQ retransmission according to the preset power step.
  • the method in this embodiment is described above by taking the three scenarios shown in Figure 10 to Figure 12 as examples. This embodiment is not limited to this.
  • the UE and gNB can also have other scenarios. For implementation in other scenarios, refer to Embodiment 1 and Example 2.
  • This embodiment provides a method and apparatus for sending a random access response, which is configured in network equipment. 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 implementation of the method of embodiment 1, and the same content will not be repeated.
  • FIG. 13 is a schematic diagram of an apparatus 1300 for sending a random access response in this embodiment. As shown in FIG. 13, the apparatus 1300 includes a receiving unit 1301 and a sending unit 1302.
  • the receiving unit 1301 receives a first message sent by a terminal device, where the first message contains a random access preamble and data; if the network device demodulates the random access preamble of the first message, it cannot be demodulated Out the data of the first message, the sending unit 1302 sends a first random access response to the terminal device, and the first random access response carries at least the usage allocated by the network device for the terminal device. In order to retransmit the uplink transmission authorization of the data of the first message and the sending time advance command; the receiving unit 1301 receives the retransmission of the data of the first message sent by the terminal device.
  • the sending unit 1302 sends a third random access to the terminal device.
  • the third random access response at least carries contention resolution information for the data of the first message.
  • the sending unit 1302 sends a second random access to the terminal device.
  • the second random access response at least carries contention resolution information for the data of the first message and the TC-RNTI allocated by the network device to the terminal device.
  • the second random access response also carries a sending time advance command for the terminal device to send uplink data.
  • the random access preamble of the first message is sent in a pre-configured physical random access channel opportunity (PRACH occasion); the data of the first message is sent in a pre-configured uplink transmission resource ;
  • PRACH occasion has a mapping relationship with one or more uplink transmission resources.
  • the PDCCH of the first random access response is addressed to the random access radio network temporary identifier (RA-RNTI), and the medium access control (MAC) layer subheader of the transport block scheduled by the PDCCH Contains identification information matching the random access preamble of the first message; wherein, the RA-RNTI corresponds to the time and frequency position of the PRACH occasion.
  • RA-RNTI random access radio network temporary identifier
  • MAC medium access control
  • the sending unit 1302 sends the first hybrid automatic repeat request (HARQ) NACK signaling to the terminal device to schedule The terminal device sends a first HARQ retransmission for the data of the first message; if the number of first HARQ retransmissions of the data of the first message reaches a preset first threshold, the network device still has no After demodulating the data of the first message, the sending unit 1302 sends the first random access response to the terminal device; if the number of first HARQ retransmissions of the data of the first message reaches a preset Before the set first threshold, if the network device demodulates the data of the first message, the sending unit 1302 sends a fourth random access response to the terminal device, and the fourth random access response is at least Carry contention resolution information for the data of the first message.
  • HARQ hybrid automatic repeat request
  • the apparatus 1300 may further include:
  • the sending unit 1302 sends second HARQ NACK signaling to the terminal device, and schedules the terminal device to send a second HARQ retransmission for the data of the first message; if Before the second HARQ retransmission number of the data of the first message reaches the preset second threshold, the network device demodulates the data of the first message, and the sending unit 1302 sends the data to the terminal device Send a fifth random access response, where the fifth random access response at least carries contention resolution information for the data of the first message.
  • the third random access response also carries a temporary cell radio network temporary identifier (TC-RNTI) allocated by the network device to the terminal device.
  • TC-RNTI temporary cell radio network temporary identifier
  • the PDCCH of the third random access response is addressed to RA-RNTI
  • the MAC layer subheader of the transport block scheduled by the PDCCH contains the random access preamble matching the random access preamble of the first message
  • the identification information wherein, the random access preamble of the first message is sent in a pre-configured PRACH occasion, and the RA-RNTI corresponds to the time and frequency location of the PRACH occasion.
  • the first random access response also carries the TC-RNTI allocated by the network device to the terminal device.
  • the PDCCH of the third random access response is addressed to a temporary radio network temporary identity (C-RNTI); the C-RNTI matches the TC-RNTI carried in the first random access response.
  • RNTI or, the C-RNTI matches the temporary wireless network temporary identification medium access control unit (C-RNTI MAC CE) transmitted in the data of the first message.
  • C-RNTI temporary radio network temporary identity
  • the 2-step random access process if the network device successfully demodulates the random access preamble (MsgA preamble) of the first message, but the data (MsgA payload) of the first message is demodulated In the case of failure, the 2-step random access process can be rolled back to the 4-step random access process, avoiding the interruption of the random access process.
  • This embodiment provides a random access response receiving device, which is configured in a terminal device. Since the principle of the device to solve the problem is similar to the method of embodiment 2, its specific implementation can refer to the implementation of the method of embodiment 2, and the same content will not be repeated.
  • FIG. 14 is a schematic diagram of an apparatus 1400 for receiving a random access response in this embodiment.
  • the apparatus 1400 includes: a sending unit 1401 and a receiving unit 1402.
  • the sending unit 1401 sends a first message to the network device, where the first message includes a random access preamble and data; the receiving unit 1402 receives the random access response sent by the network device, if the received random access response is The first random access response, the sending unit 1401 retransmits the data of the first message in the resource indicated by the uplink transmission authorization carried in the first random access response; wherein, the first random access The response carries at least the uplink transmission authorization and the sending time advance command.
  • the receiving unit 1402 after the sending unit 1401 retransmits the data of the first message in the resource indicated by the uplink transmission authorization carried in the first random access response, the receiving unit 1402 also receives the A third random access response sent by the network device, where the third random access response at least carries contention resolution information for the data of the first message.
  • the apparatus 1400 further includes:
  • the first processing unit 1403 determines whether the contention resolution is successful according to the contention resolution information.
  • the device 1400 further includes:
  • the second processing unit 1404 if the random access response received by the receiving unit 1402 is a second random access response, the second processing unit 1404 resolves the contention according to the contention carried in the second random access response Information determines whether the contention resolution is successful; wherein, the second random access response carries at least the contention resolution information for the data of the first message and the TC-RNTI allocated by the network device to the terminal device.
  • the second random access response also carries a sending time advance command for the terminal device to send uplink data.
  • the sending unit 1401 sends the random access preamble of the first message in a pre-configured physical random access channel opportunity (PRACH occasion); and, the sending unit 1401 is based on the PRACH
  • the occasion determines the uplink transmission resource for sending the data of the first message, or the sending unit 1401 determines the uplink for sending the data of the first message according to the PRACH occasion and the random access preamble of the first message Resource; and, the sending unit 1401 sends the data of the first message on the determined uplink transmission resource.
  • PRACH occasion physical random access channel opportunity
  • the PDCCH of the first random access response can be addressed to RA-RNTI, and the MAC layer subheader of the transport block scheduled by the PDCCH contains the random access preamble of the first message.
  • Matching identification information wherein, the RA-RNTI corresponds to the time and frequency location of the PRACH occasion.
  • the receiving unit 1402 after the sending unit 1401 sends the first message to the network device, the receiving unit 1402 also receives the first HARQ NACK signaling sent by the network device, and the first HARQ NACK signaling is used to schedule the first HARQ retransmission of the data of the first message; if the number of first HARQ retransmissions of the data of the first message does not reach the first threshold, the sending unit 1401 sends a notification to the The network device sends the first HARQ retransmission of the data of the first message.
  • the sending unit 1401 may retransmit the data of the first message using the data in the sending buffer of the data of the first message; or, the MAC layer encapsulation and grouping entity of the terminal device may retransmit the data of the first message.
  • the data of the first message is generated, and the sending unit 1401 puts the regenerated data of the first message into the sending buffer of the data of the first message for sending.
  • the receiving unit 1402 receives the network The second HARQ NACK signaling sent by the device, the second HARQ NACK signaling is used to schedule the second HARQ retransmission of the data of the first message; if the second HARQ retransmission of the data of the first message If the number of times does not reach the first threshold, the sending unit 1401 sends the second HARQ retransmission of the data of the first message to the network device.
  • the sending unit 1401 adjusts the uplink sending time according to the sending time advance command carried in the first random access response, and uses RA-RNTI to retransmit the data of the first message; wherein, the The sending unit 1401 sends the random access preamble of the first message in a pre-configured PRACH occasion, and the RA-RNTI corresponds to the time and frequency position of the PRACH occasion.
  • the third random access response also carries the TC-RNTI allocated by the network device to the terminal device.
  • the PDCCH of the third random access response is addressed to RA-RNTI, and the MAC layer subheader of the transport block scheduled by the PDCCH contains identification information matching the random access preamble of the first message; wherein,
  • the sending unit 1401 sends the random access preamble of the first message in a pre-configured PRACH occasion, and the RA-RNTI corresponds to the time and frequency position of the PRACH occasion.
  • the first random access response also carries the TC-RNTI allocated by the network device to the terminal device.
  • the sending unit 1401 adjusts the uplink sending time according to the sending time advance command carried in the first random access response, and retransmits the data of the first message using the TC-RNTI carried in the first random access response .
  • the PDCCH of the third random access response is addressed to the C-RNTI, and the C-RNTI matches the TC-RNTI carried in the first random access response, or the C -The RNTI matches the C-RNTI MAC CE transmitted in the data of the first message.
  • the second processing unit 1404 determines whether the contention resolution is successful according to the contention resolution information carried in the second random access response, including: when the contention resolution carried in the second random access response When the information matches the data of the first message, the second processing unit 1404 determines that the contention resolution is successful, and sets the C-RNTI to the TC-RNTI carried in the second random access response; otherwise, the first The second processing unit 1404 determines that the contention resolution fails, and discards the TC-RNTI carried in the second random access response.
  • the 2-step random access process if the network device successfully demodulates the random access preamble (MsgA preamble) of the first message, but the data (MsgA payload) of the first message is demodulated In the case of failure, the 2-step random access process can be rolled back to the 4-step random access process, avoiding the interruption of the random access process.
  • the embodiment of the present invention also provides a network device, which includes the device described in Embodiment 3.
  • FIG. 15 is a schematic diagram of an embodiment of a network device according to an embodiment of the present invention.
  • the network device 1500 may include: a central processing unit (CPU) 1501 and a memory 1502; the memory 1502 is coupled to the central processing unit 1501.
  • the memory 1502 can store various data; in addition, it also stores information processing programs, which are executed under the control of the central processing unit 1501 to receive various information sent by the terminal device and send various information to the terminal device.
  • the functions of the device described in embodiment 3 can be integrated into the central processing unit 1501, and the central processing unit 1501 implements the functions of the device described in embodiment 3, and the device described in embodiment 3 The functions of is incorporated here, so I won’t repeat them here.
  • the device described in Embodiment 3 can be configured separately from the central processing unit 1501.
  • the device described in Embodiment 3 can be a chip connected to the central processing unit 1501, and the device can be Control to realize the function of the device described in the third embodiment.
  • the network device 1500 may further include: a transceiver 1503, an antenna 1504, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It should be noted that the network device 1500 does not necessarily include all the components shown in FIG. 15; in addition, the network device 1500 may also include components not shown in FIG. 15, and the prior art can be referred to.
  • This embodiment provides a terminal device, which includes the device described in Embodiment 4.
  • Fig. 16 is a schematic diagram of a terminal device according to an embodiment of the present invention.
  • the terminal device 1600 may include a central processing unit 1601 and a memory 1602; the memory 1602 is coupled to the central processing unit 1601. 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 functions of the device described in embodiment 4 can be integrated into the central processing unit 1601, and the central processing unit 1601 implements the functions of the device described in embodiment 4, among which the device described in embodiment 4 The functions of is incorporated here, so I won’t repeat them here.
  • the device described in Embodiment 4 can be configured separately from the central processing unit 1601.
  • the device described in Embodiment 4 can be configured as a chip connected to the central processing unit 1601, and the central processing unit 1601 Control to realize the function of the device described in the fourth embodiment.
  • the terminal device 1600 may further include: a communication module 1603, an input unit 1604, an audio processing unit 1605, a display 1606, and a power supply 1607. It is worth noting that the terminal device 1600 does not necessarily include all the components shown in FIG. 16; in addition, the terminal device 1600 may also include components not shown in FIG. 16, which can refer to the prior art.
  • the central processing unit 1601 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 1601 receives input and controls each of the terminal equipment 1600. Operation of components.
  • the memory 1602 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 1601 can execute the program stored in the memory 1602 to realize information storage or processing. The functions of other components are similar to the existing ones, so I won't repeat them here.
  • the components of the terminal device 1600 can be implemented by dedicated hardware, firmware, software, or a combination thereof, without departing from the scope of the present invention.
  • terminals in the random access process are avoided.
  • 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 1500 described in Embodiment 5
  • the terminal device is, for example, the terminal device 1600 described in Embodiment 6.
  • 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 6, it is not here. Repeat it again.
  • the network device may be, for example, the gNB in NR.
  • the network device In addition to the functions of the device described in Embodiment 3, it also includes the regular composition and functions of the network device, as described in Embodiment 5. No longer.
  • 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 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 in a terminal device.
  • An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in a network device, the program causes a computer to execute the method described in Embodiment 1 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 in a network 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, the first message including a random access preamble and data;
  • the sending unit if the network device demodulates the random access preamble of the first message, but cannot demodulate the data of the first message, the sending unit sends the first random access preamble to the terminal device.
  • An access response where the first random access response carries at least an uplink transmission authorization and a sending time advance command allocated to the terminal device by the network device for retransmitting the data of the first message;
  • the receiving unit receives the retransmission of the data of the first message sent by the terminal device.
  • the sending unit sends the first message to the terminal device.
  • the sending unit sends a second random access response to the terminal device, and the second The random access response at least carries contention resolution information for the data of the first message and the TC-RNTI allocated by the network device to the terminal device.
  • the sending unit sends the first hybrid automatic repeat request (HARQ) NACK signaling to the terminal device, and schedules the terminal device to send information for all The first HARQ retransmission of the data of the first message;
  • HARQ hybrid automatic repeat request
  • the sending unit sends a message to the terminal The device sends the first random access response
  • the network device demodulates the data of the first message, the sending unit sends the data to the terminal device Send a fourth random access response, where the fourth random access response carries at least contention resolution information for the data of the first message.
  • a processing unit which empties the buffer area used for soft merge to receive the data of the first message after the sending unit sends the first random access response to the terminal device, and when the receiving unit receives the data When the data of the first message is retransmitted, the retransmitted data is used to decode the data of the first message; or, the buffer area used for soft combining and decoding the data of the first message is not cleared, when the When receiving the retransmission of the data of the first message, the receiving unit uses the buffer data and the retransmitted data to perform soft combining and decoding on the data of the first message.
  • the sending unit sends second HARQ NACK signaling to the terminal device to schedule the terminal The device sends a second HARQ retransmission for the data of the first message;
  • the sending unit sends the data to the terminal device Send a fifth random access response, where the fifth random access response at least carries contention resolution information for the data of the first message.
  • 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 a random access response sent by the network device, and if the received random access response is a first random access response, the sending unit is configured to perform the uplink operation carried in the first random access response
  • the data of the first message is retransmitted in the resource indicated by the transmission authorization; wherein, the first random access response at least carries the uplink transmission authorization and the transmission time advance command.
  • the sending unit after the sending unit retransmits the data of the first message in the resource indicated by the uplink transmission authorization carried in the first random access response, the receiving The unit further receives a third random access response sent by the network device, where the third random access response carries at least contention resolution information for the data of the first message, and the apparatus further includes:
  • the first processing unit judges whether the contention resolution is successful according to the contention resolution information.
  • the second processing unit determines whether or not according to the contention resolution information carried in the second random access response The contention resolution is successful; wherein the second random access response carries at least the contention resolution information for the data of the first message and the TC-RNTI allocated by the network device to the terminal device.
  • the sending unit sends the random access preamble of the first message in a pre-configured physical random access channel opportunity (PRACH occasion);
  • PRACH occasion a pre-configured physical random access channel opportunity
  • the sending unit determines the uplink transmission resource for sending the data of the first message according to the PRACH occasion, or the sending unit determines to send the data according to the PRACH occasion and the random access preamble of the first message
  • the uplink resource of the data of the first message and the sending unit sends the data of the first message on the determined uplink transmission resource.
  • the receiving unit further receives the first HARQ NACK signaling sent by the network device, The first HARQ NACK signaling is used to schedule the first HARQ retransmission for the data of the first message;
  • the sending unit sends the first HARQ retransmission of the data of the first message to the network device.
  • the sending unit retransmits the data of the first message using the data in the sending buffer of the data of the first message; or,
  • the MAC layer encapsulation group entity of the terminal device regenerates the data of the first message, and the sending unit puts the regenerated data of the first message into the sending buffer of the data of the first message for sending .
  • the sending unit sends the second HARQ retransmission of the data of the first message to the network device.
  • the sending unit adjusts the uplink sending time according to the sending time advance command carried in the first random access response, and uses RA-RNTI to retransmit the The data of the first message; wherein the sending unit sends the random access preamble of the first message in a pre-configured PRACH occasion, and the RA-RNTI corresponds to the time and frequency position of the PRACH occasion.
  • the second processing unit determines that the contention resolution is successful, and sets C-RNTI as the second random access TC-RNTI carried in the response;
  • the second processing unit determines that the contention resolution fails, and discards the TC-RNTI carried in the second random access response.

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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 un procédé et un appareil d'envoi et de réception de réponse d'accès aléatoire, et un système de communication. Le procédé d'envoi d'une réponse d'accès aléatoire comprend les étapes suivantes : un dispositif réseau reçoit un premier message en provenance d'un dispositif terminal, le premier message comprenant un préambule d'accès aléatoire et des données ; si le dispositif réseau démodule le préambule d'accès aléatoire du premier message, mais ne peut pas démoduler les données du premier message, le dispositif réseau envoie une première réponse d'accès aléatoire au dispositif terminal, la première réponse d'accès aléatoire transportant au moins une autorisation de transmission de liaison montante allouée par le dispositif réseau au dispositif terminal pour retransmettre les données du premier message et une commande d'avance de temps d'envoi ; et le dispositif réseau reçoit la transmission des données du premier message en provenance du dispositif terminal. De cette manière, le processus de défaillance d'accès aléatoire à base de contention en deux étapes peut être ramené à un accès aléatoire à base de contention en quatre étapes, ce qui évite l'interruption du processus d'accès aléatoire.
PCT/CN2019/075279 2019-02-15 2019-02-15 Procédé et appareil d'envoi et de réception de réponse d'accès aléatoire, et système Ceased WO2020164141A1 (fr)

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