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WO2017166023A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2017166023A1
WO2017166023A1 PCT/CN2016/077514 CN2016077514W WO2017166023A1 WO 2017166023 A1 WO2017166023 A1 WO 2017166023A1 CN 2016077514 W CN2016077514 W CN 2016077514W WO 2017166023 A1 WO2017166023 A1 WO 2017166023A1
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WO
WIPO (PCT)
Prior art keywords
message
rar
terminal device
random access
network device
Prior art date
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Ceased
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PCT/CN2016/077514
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English (en)
Chinese (zh)
Inventor
于峰
于映辉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201680062439.4A priority Critical patent/CN108353435A/zh
Priority to PCT/CN2016/077514 priority patent/WO2017166023A1/fr
Publication of WO2017166023A1 publication Critical patent/WO2017166023A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for random access.
  • M2M Machine-to-Machine
  • LTE Long Term Evolution
  • Message 1 in the M2M system includes Buffer Status Reports (BSR) information.
  • Message 2 includes random access RNTI (RA-RNTI) and random number, and allocates cell radio network temporary identifier (Cell RNTI). , C-RNTI), the transmission resource of the message 3 is simultaneously allocated, the data can be directly transmitted in the message 3, and the message 4 is a conflict resolution.
  • BSR Buffer Status Reports
  • the reliability of the physical physical layer downlink control channel (PDCCH) channel of the M2M is only 90%, which is different from 99% of LTE, and the RAR message is not retransmitted. This leads to the terminal equipment receiving many times.
  • the transmission failure is not caused by the RAR message, and the cause of this problem is mainly because the channel quality is not good.
  • the terminal device When the terminal device sends the message 1, if the message 2 is not received, the random access will be re-initiated. Since the reliability of the physical layer physical downlink control channel (PDCCH) is only 90%, even if the network device allows the terminal device to access, the message 2 response is sent to the terminal device, and the message 2 fails to be transmitted due to poor channel quality. The probability is relatively high, so that a large number of terminal devices cannot successfully receive the message 2, and the random access is re-initiated, resulting in an increase in power consumption of the terminal device and a reduction in the random access channel (RACH) capacity. .
  • PDCCH physical layer physical downlink control channel
  • a method and apparatus for random access are described herein to solve the problem that the terminal device of the random access scheme in the prior art has large power consumption and reduces the RACH capacity.
  • a method for random access including:
  • the network device sends at least two random access response RAR messages to the terminal device in a set time period, where the RAR message is used for random access by the terminal device, where the set time period is The time between the random access request message and the sending of the message 4 by the network device.
  • sending at least two RAR messages to the terminal device within a set time period includes:
  • the RAR message After receiving the random access request message of the terminal device, the RAR message is sent for the first time. If the message 3 sent by the terminal device is not received at the set resource location, the RAR message is sent a second time.
  • transmitting the RAR message multiple times can increase the probability that the terminal device receives the RAR message, thereby reducing the transmission failure caused by the poor channel quality.
  • the set resource location includes:
  • the first receives the resource location of message 3; or the retransmission location of message 3.
  • the transmitting the at least two RAR messages within the set time period comprises: transmitting the at least two RAR messages on the downlink control channel within a set time period.
  • the method further includes adding a cell radio network temporary identifier C-RNTI to the at least two RAR messages that are sent, where the C-RNTI is used by the terminal device to receive the RAR message.
  • C-RNTI is used by the terminal device to receive the RAR message.
  • the C-RNTI is carried when the RAR message is sent, so that the RAR is received.
  • the terminal device of the message can perform the second random access procedure according to the C-RNTI in the RAR message when the first random access fails, thereby reducing the probability that the message 1 is identical when re-accessing, and can also achieve the reduction.
  • the addition of the cell radio network temporary identifier C-RNTI in the at least two RAR messages is different.
  • a method for random access including:
  • the network device After receiving the random access request message of the terminal device, the network device adds a C-RNTI to the RAR message sent to the terminal device;
  • the network device sends the RAR message to the terminal device; the terminal device fails to access the random access, and when the random access is initiated again, the random access procedure is initiated by using the C-RNTI carried in the received RAR message.
  • a method for random access including:
  • the terminal device sends a random access request message to the network device by using a random number
  • the terminal device detects at least two RAR messages sent by the network device in a set time period
  • Random access is performed according to any RAR message received.
  • the detecting, by the terminal device, the at least two RAR messages sent by the network device in the set time period includes:
  • the detecting, by the terminal device, the at least two RAR messages sent by the network device in the set time period includes:
  • the first RAR message is received, after sending the message 3 corresponding to the first RAR message, it is detected whether there is a message 4 sent by the network device, if there is no message 4, In the second time period, it is detected whether there is a second RAR message sent by the network device.
  • the method further includes:
  • determining the target RAR message from the at least two RAR messages includes:
  • the terminal device determines, by the terminal device, the RAR message received by the terminal device in the at least two RAR messages as the target RAR message.
  • selecting one of the plurality of C-RNTIs to receive the C-RNTI and re-performing the random access procedure can ensure the validity of the random number used for random access again.
  • a method for random access including:
  • the terminal device After the terminal device initiates the random access request message by using the random number, receiving the RAR message sent by the network device;
  • the C-RNTI is obtained from the RAR message, and the random access procedure is re-initiated by using the obtained C-RNTI.
  • an embodiment of the present invention provides a network device, where the network device has a function of implementing network device behavior in the foregoing method design.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the modules can be software and/or hardware.
  • the structure of the network device includes a receiving module and:
  • the receiving module is configured to receive a random access request message of the terminal device
  • the sending module is configured to send at least two random access response RAR messages to the terminal device in a set time period, where the RAR message is used for random access by the terminal device;
  • the time period is the time between when the network device receives the random access request message and when the message 4 is sent.
  • the sending module is specifically configured to continuously send the RAR message twice before the receiving module receives the message 3; or, after receiving the random access request message of the terminal device, The RAR message is sent for the first time. If the message 3 sent by the terminal device is not received at the set resource location, the RAR message is sent a second time.
  • the set resource location includes:
  • the first receives the resource location of message 3; or the retransmission location of message 3.
  • the sending module is specifically configured to be in a set time period and in a downlink control channel Send at least two RAR messages on.
  • the network device further includes:
  • a processing module configured to add a cell radio network temporary identifier C-RNTI to the at least two RAR messages that are sent, where the C-RNTI is used to perform random access failure and re-initiation when the UE uses the received RAR message During random access, a random access procedure is initiated according to the C-RNTI.
  • the processing mode is further configured to add different C-RNTIs in the at least two RAR messages.
  • another network device where the network device includes:
  • a receiving module configured to receive a random access request message of the terminal device
  • a processing module configured to add a C-RNTI to the RAR message sent to the terminal device, where the C-RNTI is used to initiate random access by using the C-RNTI when the terminal device initiates random access for the second time Entry process
  • a sending module configured to send the RAR message to the terminal device.
  • a seventh aspect provides a terminal device, including:
  • a sending module configured to send a random access request message to the network device by using a random number
  • a processing module configured to detect at least two RAR messages sent by the network device within a set time period; and perform random access according to any RAR message received.
  • the processing module is specifically configured to detect whether there are at least two RAR messages continuously sent by the network device during the set time period.
  • the processing module is specifically configured to detect whether there is a first RAR message sent by the network device in the first time period;
  • the terminal device further includes a receiving module, configured to receive the first RAR message
  • the sending module is configured to send, after receiving the first RAR message, the message 3 corresponding to the first RAR message to the network device;
  • the processing module is specifically configured to detect whether there is a message 4 sent by the network device, and if there is no message 4, detect whether there is a second RAR message sent by the network device in the second time period.
  • the processing module is further configured to: when the terminal device fails to access random access, determine a target RAR message from the at least two RAR messages; acquire a C-RNTI from the target RAR message, and Re-initiating the random access procedure with the C-RNTI.
  • the processing module is specifically configured to obtain corresponding at least two C-RNTIs from the at least two RAR messages; if the at least two C-RNTIs are not the same, the at least the The RAR message received by the terminal device in the two RAR messages at the latest is determined as the target RAR message.
  • a terminal device where the terminal device includes:
  • a sending module configured to send a random access request message to the network device by using a random number
  • An access module configured to receive a RAR message sent by the network device; when the terminal device is randomly connected When the random access is initiated, the C-RNTI is obtained from the RAR message, and the random access procedure is re-initiated by using the obtained C-RNTI.
  • an embodiment of the present invention provides an M2M system, where the system includes the network device and the terminal device in the foregoing aspect.
  • the network device can continuously send the RAR message twice to improve the success rate of the message 2.
  • the probability that the terminal device fails to receive the RAR message due to the channel quality is reduced.
  • the purpose of reducing resource consumption and power consumption of random access is achieved.
  • FIG. 1 is a schematic flowchart of a method for random access according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart diagram of another method for random access according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic flowchart diagram of another method for random access according to Embodiment 3 of the present invention.
  • Embodiment 4 is a schematic flowchart of another method for random access according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic flowchart of a method for providing a method for providing a method according to Embodiment 5 of the present invention.
  • FIG. 6 is a schematic flowchart of a method for providing a method for providing a method according to Embodiment 6 of the present invention.
  • FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
  • the implementation idea of the present invention is: in the M2M system, when the terminal device initiates or re-initiates random access, two or more terminal devices may send the same random number on the same time-frequency resource, such that multiple terminals The device does not resolve the conflict in message 2. All terminal devices consider that the uplink allocation resource of message 2 is for itself and sends message 3 on it, because message 3 contains the unique identifier of each terminal device, and message 3 There is a high probability of conflict, and all terminal devices that have not been resolved by conflict must re-initiate random access.
  • the conflict of the message 3 is more resource-consuming than the conflict of the message 1 (the different terminal devices send different random numbers on the same time-frequency resource, and the conflict is solved by the message 2), and the power consumption is greater because the message 3 And message 4 are both HARQ mechanisms.
  • the conflict of the message 3 may occur, and the conflict in the message 1 is adjusted as much as possible, so that the message 1 can be implemented by using the message 2.
  • Conflict resolution In order to reduce the resource consumption and power consumption of the random access, in the solution provided by the embodiment of the present invention, the conflict of the message 3 may occur, and the conflict in the message 1 is adjusted as much as possible, so that the message 1 can be implemented by using the message 2.
  • the network device involved in the embodiments of the present invention may be a base station, or an access point, or may refer to a device in the access network that communicates with the wireless terminal through one or more sectors on the air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station (eNB or e-NodeB, evolutional Node B) in LTE. This application is not limited.
  • the terminal device may provide voice and/or data connectivity to the user.
  • the wireless terminal can communicate with one or more core networks via a Radio Access Network (RAN), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • RAN Radio Access Network
  • RAN can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • RAN Radio Access Network
  • RAN Radio Access Network
  • PCS Personal Communication Service
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDAs Personal Digital Assistants
  • a wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, or an access point.
  • Remote Terminal Access Terminal, User Terminal, User Agent, User Device, or User Equipment.
  • an embodiment of the present invention provides a method for random access, which is based on an implementation process of a network device side.
  • Step 101 The network device receives a random access request message of the terminal device.
  • Step 102 The network device sends at least two random access response RAR messages to the terminal device in a set time period, where the RAR message is used for random access by the terminal device, where the setting The time period is the time between when the network device receives the random access request message and when the message 4 is sent.
  • the manner in which the network device sends the RAR message at least twice in the set time period includes multiple types.
  • the following two optimization implementations are provided:
  • the network device may send the RAR message in a set time period and send at least two RAR messages on the downlink control channel.
  • the RAR message may be sent on the two consecutive PDCCH channels after receiving the RA Request message by the terminal device or on multiple PDCCH channels in a period of time.
  • the RAR message is sent for the first time after receiving the random access request message of the terminal device. If the message 3 sent by the terminal device is not received at the set resource location, the RAR message is sent a second time.
  • the terminal device determines whether the message 3 is successfully received, it is required to determine whether the terminal device sends the message 3 (Msg3) by using the HARQ mechanism, and the maximum number of HARQs in the HARQ mechanism, and the resource location set according to the above two conditions may be :
  • the resource location of the first received message 3 does not receive the message 3, it is determined that the message 3 is not successfully received, and the corresponding resource location is the resource location of the first received message 3;
  • the network device continuously sends the RAR message twice to improve the success rate of the message 2.
  • the probability that the terminal device fails to receive the RAR message due to the channel quality is reduced.
  • the terminal device retransmits according to the random number, and does not consider avoiding the collision problem with the same random number of resources.
  • the present invention provides a method, and further includes:
  • a random access procedure is initiated according to the C-RNTI.
  • the network device adds the C-RNTI when the RAR message is sent, so that after the terminal device successfully receives the message 2, if the subsequent random access request needs to be re-initiated, the C-RNTI allocated in the message 2 is used to re-initiate the random connection.
  • the incoming request reduces the probability that message 1 is identical when re-accessing, thereby reducing the probability of collision of message 3.
  • the network device may add a cell radio network temporary identifier in the at least two RAR messages.
  • C-RNTI is not the same.
  • the C-RNTI is obtained by the network device based on the existing allocation algorithm.
  • the specific acquisition mode of the C-RNTI is not described here.
  • the embodiment of the present invention further provides another method for random access, which is based on an implementation process of a network device side, and the method specifically includes:
  • Step 201 After receiving the random access request message of the terminal device, the network device adds a C-RNTI to the RAR message sent to the terminal device.
  • the C-RNTI is added to the RAR message in the manner of the foregoing embodiment.
  • Step 202 Send the RAR message to the terminal device; enable the terminal device to randomly access the random access, and initiate a random access procedure by using the C-RNTI carried in the received RAR message when the random access is initiated again.
  • the network device adds the C-RNTI when the RAR message is sent, so that after the terminal device successfully receives the message 2, if the subsequent random access request needs to be re-initiated, the C-RNTI allocated in the message 2 is used to re-initiate the random connection.
  • the incoming request reduces the probability that message 1 is identical when re-accessing, thereby reducing the probability of collision of message 3.
  • the embodiment of the present invention further provides another method for random access, which is based on an implementation process of the terminal device side, and the method specifically includes:
  • Step 301 The terminal device sends a random access request message to the network device by using a random number.
  • Step 302 The terminal device detects at least two RAR messages sent by the network device in a set time period, and performs random access according to any RAR message received.
  • the network device side can implement the sending of the message 2 in multiple manners. Therefore, the corresponding terminal device side detects the RAR message.
  • the specific implementation may be:
  • the network device sends the RAR message twice before the message 3, and the corresponding:
  • the terminal device detects whether there are at least two RAR messages continuously sent by the network device during the set time period.
  • the set time period is a certain time period after the random access request message is sent; the time period may be a time before the random access request message is sent to the resource location of the sent message 3 that the network device of the budget may allocate.
  • the network device sends a RAR message before and after the message 3, and the corresponding:
  • the first RAR message is received, after sending the message 3 corresponding to the first RAR message, it is detected whether there is a message 4 sent by the network device, and if the message 4 is not, the second time period is It is detected internally whether there is a second RAR message sent by the network device.
  • the terminal device may re-initiate the random access request after the message 2 is successfully received, and may use the C-RNTI allocated in the message 2 to re A random access request is initiated to reduce the probability that message 1 is identical when re-accessing, thereby reducing the collision probability of message 3.
  • the specific implementation can be:
  • the specific implementation includes:
  • A1. Determine a target RAR message from the at least two RAR messages.
  • the specific implementation of determining the target RAR message may be:
  • A2 Obtain a C-RNTI from the target RAR message, and re-initiate a random access procedure by using the C-RNTI.
  • the terminal device uses the C-RNTI in the RAR message to initiate the random access again.
  • the specific implementation may be:
  • the terminal device receives the first RAR message at the first time, and receives the second RAR message at the second time, and the first RAR message carries the first C-RNTI; the second RAR message carries the first The second C-RNTI; in the case that the second time is later than the first time, when the terminal device re-initiates the random access, the second C-RNTI is used to re-initiate the random access procedure.
  • the embodiment of the present invention further provides another method for random access, where the method specifically includes:
  • Step 401 After the terminal device initiates a random access request message by using a random number, the terminal device receives the RAR message sent by the network device.
  • Step 402 When the terminal device fails to access the random access and initiates the random access again, the C-RNTI is obtained from the RAR message, and the random access procedure is re-initiated by using the obtained C-RNTI.
  • the terminal device may receive multiple RAR messages sent by the network device, and the C-RNTI in each RAR message that may be received is different, and the terminal device re-initiates the C-RNTI selection.
  • the specific selection manner is the same as that in the previous embodiment, and is not described here.
  • the method of the embodiment of the present invention is further described by the information exchange between the terminal device side and the network device side.
  • the network device is set.
  • RAR messages are sent twice in a fixed time window to increase the success rate of RAR transmission.
  • the specific implementation is:
  • the terminal device listens to the broadcast message of the system, acquires the RACH channel configuration information, and selects the corresponding RACH resource according to the information such as the coverage level of the terminal device;
  • the terminal device initiates a random access request message by using a random number
  • the network device After receiving the random access request message sent by the terminal device, the network device continuously sends two RAR messages, including the allocation of the C-RNTI and the scheduling information of the message 3, in a time window.
  • the two RAR messages are sent before the network device allocates the resource location scheduled by the message 3;
  • the terminal device attempts to receive the RAR message within a certain period of time. If a RAR message is received, the terminal device stops receiving the RAR message, and sends the Msg3 according to the scheduling information in the received RAR message. If the RAR message is not received, the terminal device re-receives the RAR message. Random access is initiated with a random number.
  • the terminal device sends Msg3 and waits for Msg4.
  • Msg3 can retransmit Msg3 multiple times according to the HARQ mechanism, that is, when Msg4 is not received; the terminal device can also send Msg3 without using the HARQ mechanism.
  • the network device After receiving the Msg3 of the terminal device, the network device sends a conflict resolution message Msg4.
  • the terminal device does not receive the Msg4, it needs to re-initiate the random access procedure, and re-initiate the random access procedure by using the C-RNTI allocated in the message 2.
  • the network device sends a RAR message twice before and after the message 3 to increase the success rate of the RAR.
  • the specific implementation is as follows:
  • the terminal device listens to the broadcast message of the system, acquires the RACH channel configuration information, and selects the corresponding RACH resource according to the information such as the coverage level of the device:
  • the terminal device initiates a random access request message by using a random number
  • the network device After receiving the random access request message sent by the terminal device, the network device continuously sends the first RAR message in a time window, where the network device includes the allocation of the C-RNTI and the scheduling information for the message 3.
  • the terminal device attempts to receive the RAR message within a period of time. If a RAR message is received, the Msg3 is sent according to the scheduling information in the received RAR message; if the RAR message is not received, the random access is initiated again by using the random number. .
  • the network device If the network device does not receive the Msg3 of the terminal device in the scheduled Msg3 resource location (or does not receive the Msg3 in the subsequent HARQ location), then the transmission of the message 2 is considered to be unsuccessful, and the network device resends the Msg2 and re-sends Allocate uplink resources and C-RNTI.
  • the terminal device sends Msg3 and waits for Msg4 or the second Msg2. If the Msg4 is not received but the second Msg2 is received, the Msg3 is resent according to the scheduling information of the second Msg2. If none of them are received, then A C-RNTI in Msg2 re-initiates random access.
  • the terminal device After the terminal device sends the Msg3 according to the second Msg2, if the Msg4 is not received, the random access is re-initiated by the C-RNTI of the second Msg2.
  • a network device for performing the foregoing method corresponding to the network device of FIG. 1 and FIG. 5 and FIG. 6 , where the network device may include a receiving module 701 and Sending module 702:
  • the receiving module 701 is configured to receive a random access request message of the terminal device.
  • the sending module 702 is configured to send at least two random access response RAR messages to the terminal device in a set time period, where the RAR message is used for random access by the terminal device, where the set time is The segment is a time between the receiving module receiving the random access request message and sending the message 4.
  • the sending module 702 is specifically configured to send the RAR message twice before the receiving module receives the message to 3; or, for sending the first time after receiving the random access request message of the terminal device.
  • the RAR message sends the RAR message a second time if the message 3 sent by the terminal device is not received at the set resource location.
  • the sending, by the sending module 702, the set resource location of the message 3 sent by the terminal device includes:
  • the first receives the resource location of message 3; or the retransmission location of message 3.
  • the sending module 702 is specifically configured to send at least two RAR messages on the downlink control channel within a set time period.
  • the network device further includes:
  • a processing module configured to add a cell radio network temporary identifier C-RNTI to the at least two RAR messages that are sent, where the C-RNTI is used to perform random access failure and re-initiation when the UE uses the received RAR message During random access, a random access procedure is initiated according to the C-RNTI.
  • the processing mode is further configured to add different C-RNTIs in the at least two RAR messages.
  • the network device may be a base station, and the base station has a function of implementing the behavior of the base station in the method of Embodiment 1.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the base station includes a processor and a transmitter configured to support the base station to perform the corresponding functions in the above methods.
  • the transmitter is configured to support communication between the base station and the UE, and send information or instructions involved in the foregoing method to the UE.
  • the base station also A memory can be included for coupling with the processor that holds the necessary program instructions and data for the base station.
  • An embodiment of the present invention further provides another network device, where the network device includes:
  • a receiving module configured to receive a random access request message of the terminal device
  • a processing module configured to add a C-RNTI to the RAR message sent to the terminal device, where the C-RNTI is used to initiate random access by using the C-RNTI when the terminal device initiates random access for the second time Entry process
  • a sending module configured to send the RAR message to the terminal device.
  • an embodiment of the present invention provides a terminal device, where the terminal device is configured to perform the method corresponding to the terminal device in FIG. 3 and FIG. 5 and FIG.
  • the sending module 801 is configured to send a random access request message to the network device by using a random number
  • the processing module 802 is configured to detect at least two RAR messages sent by the network device within a set time period; and perform random access according to any RAR message received.
  • the manner in which the RAR message is sent by the network device is different, so the detection mode used by the processing module 802 to detect the RAR message is different, so the processing module 802 detects at least two sent by the network device in the set time period.
  • the specific implementation of the RAR message can be:
  • the processing module 802 is configured to detect whether there are at least two RAR messages continuously sent by the network device in the set time period;
  • Manner 2 In this manner, the second RAR message is detected according to whether the first RAR message sent by the network device is detected in the first time period.
  • the specific implementation may be:
  • the terminal device further includes a receiving module, where the receiving module is configured to receive the first RAR message;
  • the sending module 801 is configured to: after receiving, by the receiving module, the first RAR message, to the network device Sending a message 3 corresponding to the first RAR message;
  • the processing module 802 is specifically configured to detect whether there is a message 4 sent by the network device. If the message 4 is not available, it is detected whether there is a second RAR message sent by the network device in the second time period.
  • the processing module 802 is further configured to: when the terminal device fails to access, determine a target RAR message from the at least two RAR messages; obtain a C-RNTI from the target RAR message, and use The C-RNTI re-initiates a random access procedure.
  • the processing module 802 is specifically configured to obtain, from the at least two RAR messages, corresponding at least two C-RNTIs; if the at least two C-RNTIs are not the same, the at least two The RAR message received by the terminal device at the latest in the RAR message is determined as the target RAR message.
  • the embodiment is the same as that of the third embodiment, so the effect of the embodiment is the same as that of the third embodiment, and details are not described herein again.
  • An embodiment of the present invention further provides a terminal device for implementing the method shown in Figure 4, including:
  • a sending module configured to send a random access request message to the network device by using a random number
  • An access module configured to receive a RAR message sent by the network device; when the terminal device fails to access the random access and initiates the random access again, obtain the C-RNTI from the RAR message, and use the acquired C-RNTI Re-initiate the random access procedure.
  • the embodiment of the present invention further provides an M2M system.
  • the network device and the ninth embodiment shown in Embodiment 7 are provided.
  • the illustrated terminal device is a different device that implements the same solution. Therefore, when the M2M system provided by the embodiment of the present invention is used to implement the specific method, the network device shown in the seventh embodiment is used in conjunction with the terminal device shown in the ninth embodiment. The same applies to the eighth embodiment and the tenth embodiment.
  • the network device can continuously send the RAR message twice, High message 2 success rate. The probability that the terminal device fails to receive the RAR message due to the channel quality is reduced.
  • the network device adds the C-RNTI when the RAR message is sent, so that after the terminal device successfully receives the message 2, if the subsequent random access request needs to be re-initiated, the C-RNTI allocated in the message 2 is used to re-initiate the random connection.
  • the incoming request reduces the probability that message 1 is identical when re-accessing, thereby reducing the probability of collision of message 3. Thereby, the purpose of reducing resource consumption and power consumption of random access is achieved.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

L'invention concerne un procédé et un appareil d'accès aléatoire. Le procédé comprend les étapes suivantes : un dispositif de réseau reçoit, depuis un dispositif de terminal, un message de demande d'accès aléatoire; et le dispositif de réseau transmet, au dispositif de terminal, au moins deux messages de réponse d'accès aléatoire (RAR) dans une période de temps définie, le message RAR étant utilisé pour permettre au dispositif terminal d'exécuter un accès aléatoire, la période de temps définie étant une période allant de la réception du message de demande d'accès aléatoire à la transmission du message 4 par le dispositif de réseau. Le procédé et l'appareil sont utilisés pour résoudre un problème dans l'art antérieur selon lequel un accès aléatoire d'un dispositif terminal nécessite une consommation d'énergie élevée et réduit une capacité RACH.
PCT/CN2016/077514 2016-03-28 2016-03-28 Procédé et appareil d'accès aléatoire Ceased WO2017166023A1 (fr)

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CN201680062439.4A CN108353435A (zh) 2016-03-28 2016-03-28 一种随机接入的方法及装置
PCT/CN2016/077514 WO2017166023A1 (fr) 2016-03-28 2016-03-28 Procédé et appareil d'accès aléatoire

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CN112399570B (zh) * 2019-08-14 2024-07-02 大唐移动通信设备有限公司 一种资源分配方法及装置
CN112738839B (zh) * 2019-10-14 2022-07-29 中国移动通信集团山西有限公司 NB-IoT网络容量的评估方法、装置、设备及存储介质

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CN102291846A (zh) * 2010-06-21 2011-12-21 中兴通讯股份有限公司 一种随机接入方法及实现随机接入的系统
CN103987106A (zh) * 2009-01-02 2014-08-13 Lg电子株式会社 用户设备的随机接入方案
WO2015042866A1 (fr) * 2013-09-27 2015-04-02 Alcatel Lucent Procédés et dispositifs d'accès aléatoire

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CN103987106A (zh) * 2009-01-02 2014-08-13 Lg电子株式会社 用户设备的随机接入方案
CN102291846A (zh) * 2010-06-21 2011-12-21 中兴通讯股份有限公司 一种随机接入方法及实现随机接入的系统
WO2015042866A1 (fr) * 2013-09-27 2015-04-02 Alcatel Lucent Procédés et dispositifs d'accès aléatoire

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