WO2021068237A1 - Procédé et appareil permettant de recevoir un message d'accès aléatoire, ou procédé et appareil permettant d'envoyer un message d'accès aléatoire - Google Patents

Procédé et appareil permettant de recevoir un message d'accès aléatoire, ou procédé et appareil permettant d'envoyer un message d'accès aléatoire Download PDF

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Publication number
WO2021068237A1
WO2021068237A1 PCT/CN2019/110802 CN2019110802W WO2021068237A1 WO 2021068237 A1 WO2021068237 A1 WO 2021068237A1 CN 2019110802 W CN2019110802 W CN 2019110802W WO 2021068237 A1 WO2021068237 A1 WO 2021068237A1
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Prior art keywords
random access
time period
rar
message
time domain
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PCT/CN2019/110802
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English (en)
Chinese (zh)
Inventor
徐伟杰
田文强
徐婧
石聪
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to PCT/CN2019/110802 priority Critical patent/WO2021068237A1/fr
Priority to CN201980098935.9A priority patent/CN114208376B/zh
Publication of WO2021068237A1 publication Critical patent/WO2021068237A1/fr
Anticipated expiration legal-status Critical
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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

  • This application relates to the field of communications, and in particular to a method and device for receiving or sending random access messages.
  • the fifth generation (5G) communication system supports two-step random access.
  • a network device may send a message containing multiple random access responses (RAR).
  • RAR random access responses
  • the multiple RARs belong to multiple terminal devices, and the multiple terminal devices receive the After the message, feedback information needs to be sent for the RAR so that the network device can determine whether to retransmit the RAR based on the feedback information.
  • the terminal device When the terminal device fails to receive the RAR, the terminal device needs to send feedback information indicating that the reception failed to the network device. Subsequently, the terminal device needs to retransmit the message containing the random access preamble (preamble) in the next random access period and receive the RAR again, and the terminal device needs a longer time to receive the retransmitted RAR. Therefore, how to reduce the time delay of two-step random access is a problem that needs to be solved at present.
  • the present application provides a method and device for receiving or sending random access messages, which can reduce the time delay of two-step random access.
  • a method for receiving random access messages includes: sending a first message of two-step random access on a first random access resource; The second message; when the second message is not received, or when the second message does not include the first RAR corresponding to the first message, listen for an additional first message in the second time period Two messages.
  • the above method adds a time period for monitoring the second message (that is, the second time period), so that the terminal device has the opportunity to receive the retransmitted RAR or the newly transmitted RAR before the next random access period arrives, compared with the existing In the technology, the terminal device needs to wait for the next random access period to receive the RAR solution.
  • the method provided in this application reduces the time delay of the 2-step random access process.
  • a method for sending a random access message includes: receiving a first message of two-step random access on a first random access resource; and sending a two-step random access message within a first time period.
  • the second message, the second random access message includes at least one RAR; when the at least one RAR does not include the first RAR, or when it is determined that the reception of the first RAR included in the at least one RAR fails,
  • a second message including a second RAR is sent in the second time period, where the first RAR and the second RAR are RARs corresponding to the first message.
  • the above method adds a period for monitoring the retransmission of the RAR (ie, the second period), so that the terminal device has the opportunity to receive the retransmitted RAR or the newly transmitted RAR before the next random access period arrives, compared with the prior art
  • the medium terminal device needs to wait for the next random access period to receive the RAR solution.
  • the method provided in this application reduces the time delay of the 2-step random access process.
  • a device for receiving random access messages which can implement the functions corresponding to the method in the first aspect.
  • the functions can be implemented by hardware or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the device is a terminal device or a chip.
  • the device may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiving unit may be a transceiver;
  • the terminal device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions, and the processing The unit executes the instructions stored in the storage unit, so that the terminal device executes the method described in the first aspect.
  • the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to include the
  • the terminal device of the chip executes the method described in the first aspect, and the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the terminal device located outside the chip (for example, , Read-only memory, random access memory, etc.).
  • a device for sending a random access message can implement the function corresponding to the method in the second aspect.
  • the function can be implemented by hardware or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the device is a network device or chip.
  • the device may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiving unit may be a transceiver;
  • the network device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions, and the processing The unit executes the instructions stored in the storage unit, so that the network device executes the method described in the second aspect.
  • the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to include the
  • the network device of the chip executes the method described in the second aspect, and the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the network device located outside the chip (for example, , Read-only memory, random access memory, etc.).
  • a computer-readable storage medium stores a computer program.
  • the processor executes the method described in the first aspect.
  • a computer-readable storage medium stores a computer program.
  • the processor executes the method described in the second aspect.
  • a computer program product including computer program code, and when the computer program code is executed by a processor, the processor executes the method described in the first aspect.
  • a computer program product including computer program code, and when the computer program code is executed by a processor, the processor executes the method described in the second aspect.
  • a computer program which when running on a computer, causes the computer to execute the method described in the first aspect.
  • a computer program which when running on a computer, causes the computer to execute the method described in the second aspect.
  • Figure 1 is a schematic diagram of a communication system suitable for the present application
  • Figure 2 is a schematic diagram of a 4-step random access method suitable for this application
  • Figure 3 is a schematic diagram of a 2-step random access method suitable for the present application.
  • Fig. 4 is a schematic diagram of a random access method provided by the present application.
  • Fig. 5 is a schematic diagram of another random access method provided by the present application.
  • Fig. 6 is a schematic diagram of yet another random access method provided by the present application.
  • FIG. 7 is a schematic diagram of yet another random access method provided by this application.
  • FIG. 8 is a schematic diagram of yet another random access method provided by this application.
  • Fig. 9 is a schematic diagram of a random access device provided by the present application.
  • FIG. 10 is a schematic diagram of another random access device provided by this application.
  • Fig. 11 is a schematic diagram of a communication device for random access provided by the present application.
  • FIG. 1 is a schematic diagram of a communication system suitable for this application.
  • the communication system 100 includes a network device 110 and a terminal device 120.
  • the terminal device 120 communicates with the network device 110 through electromagnetic waves.
  • the terminal device 120 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, for example, the third-generation partnership program (3 rd Generation partnership project, 3GPP) defined user equipment (user equipment, UE), mobile station (mobile station, MS), soft terminal, home gateway, set-top box, etc.
  • 3GPP third-generation partnership program
  • Network device 110 may be defined by the 3GPP base stations, e.g., the fifth generation (5 th generation, 5G) communication system, a base station (gNB).
  • the network device 110 may also be a non-3GPP (non-3GPP) access network device, such as an access gateway (AGF).
  • AMF access gateway
  • the network device 110 may also be a relay station, an access point, a vehicle-mounted device, a wearable device, and other types of devices.
  • the communication system 100 is only an example, and the communication system applicable to the present application is not limited to this.
  • the number of network devices and terminal devices included in the communication system 100 may also be other numbers.
  • the terminal device After the cell search process, the terminal device has achieved downlink synchronization with the network device (also referred to as a "cell"), so the terminal device can receive downlink data.
  • the terminal equipment needs to obtain uplink synchronization with the network equipment to facilitate uplink transmission.
  • the terminal device can establish a connection with the network device through a random access process and obtain uplink synchronization. That is to say, through random access, the terminal device can obtain uplink synchronization, and obtain the unique identifier assigned to it by the network device, namely the cell radio network temporary identity (C-RNTI). Therefore, random access can be applied not only in initial access, but also in the case where the user's uplink synchronization is lost.
  • C-RNTI cell radio network temporary identity
  • the random access process can usually be triggered by one of the following six types of trigger events:
  • the terminal device will enter the RRC connected state (RRC_CONNECTED) from the radio resource control (radio resource control, RRC) idle state (RRC_IDLE).
  • the terminal device When the terminal device needs to establish uplink synchronization with a new cell, it needs to initiate random access in the new cell.
  • RRC connection re-establishment RRC connection re-establishment
  • the terminal device re-establishes a wireless connection after a radio link failure (RLF) occurs.
  • RLF radio link failure
  • the terminal device needs to reply with an acknowledgement (acknowledgement, ACK) or a negative acknowledgement (NACK) after the downlink data arrives.
  • acknowledgement acknowledgement
  • NACK negative acknowledgement
  • the uplink In the RRC connection state, when the uplink data arrives, the uplink is in an "out of synchronization" state or there is no available physical uplink control channel (PUCCH) resource for scheduling request (SR) transmission.
  • PUCCH physical uplink control channel
  • uplink data arrives, for example, when it needs to report a measurement report or send data
  • the terminal device can initiate a random access process; or if the terminal device that is already in the uplink synchronization state is allowed to use the random access channel (random access channel).
  • Access channel RACH replaces the role of SR, so when the uplink is in the "out of synchronization" state, the terminal device can initiate a random access process.
  • TA timing advance
  • random access may be triggered due to RRC active state (RRC_INACTIVE) transition, request for other system information (OSI), or beam failure recovery (beam failure recovery).
  • RRC_INACTIVE RRC active state
  • OSI system information
  • beam failure recovery beam failure recovery
  • FIG. 2 is a schematic diagram of 4-step random access.
  • the 4-step random access process can include the following four steps:
  • Step 1 The terminal device sends msg1.
  • the terminal device can send msg1 to the network device through the physical random access channel (PRACH) to tell the network device that the terminal device has initiated a random access request.
  • the msg1 carries a random access preamble (random access preamble). , RAP), RAP can also be called preamble, random access preamble sequence, preamble sequence, etc.
  • the network device can estimate the transmission delay between it and the terminal device and the size of the uplink resource required by msg3 in step 3 according to msg1.
  • Step 2 The network device sends msg2.
  • the network device After receiving msg 1 sent by the terminal device, the network device sends msg2, that is, the RAR message, to the terminal device.
  • the terminal equipment can monitor the physical downlink control channel (PDCCH) scrambled by the random access radio network temporary identity (RA-RNTI) in the RAR window to receive the radio network temporary identity (RA-RNTI) scrambled physical downlink control channel (PDCCH).
  • PDCCH scheduled physical downlink shared channel (physical downlink shared channel, PDSCH)
  • the RAR message is carried in the PDSCH.
  • the RAR message can be scheduled in a downlink control information (download control information, DCI) format (format) 1-0.
  • the terminal device If the terminal device does not receive the RAR message replies from the network device within the RAR window, it is considered that this random access has failed. If the terminal device successfully detects the RAR message in the RAR window, and the index of the preamble carried in the RAR message is the same as the index of the preamble in msg1, the terminal device can stop detecting the RAR message. The terminal device can use the RA-RNTI to descramble the RAR message, and the RA-RNTI is related to the PRACH used by the terminal device to send msg1.
  • the RAR message may include response messages for multiple terminal devices that send the preamble.
  • the response message for each terminal device includes the random access preamble identification (RAPID) used by the terminal device, resource allocation information of msg3, TA adjustment information, and temporary cell wireless network temporary identification ( temporary cell radio network temporary identity, TC-RNTI), etc.
  • subheader (subheader) of the RAR message may also include a backoff index (BI), which is used to indicate the backoff time for retransmitting msg1.
  • BI backoff index
  • Step 3 The terminal device sends msg3.
  • the terminal device judges whether the RAR is its own RAR message. For example, the terminal device can use the preamble index to check, and after determining that it belongs to its own RAR message, it generates msg3 at the RRC layer and sends the msg3 to the network device, which can carry the identification of the terminal device.
  • the msg3 sent by the terminal device in step 3 of the 4-step random access process may include different content.
  • msg3 includes the RRC connection request message generated by the RRC layer, which can carry the non-access stratum (NAS) identification information of the terminal device.
  • NAS non-access stratum
  • msg3 may also carry, for example, the serving temporary mobile subscriber identity (S-TMSI) or random number of the terminal device.
  • S-TMSI serving temporary mobile subscriber identity
  • msg3 includes the RRC connection re-establishment message generated by the RRC layer and does not carry any NAS message.
  • msg3 can also carry, for example, C-RNTI and protocol control information (protocol control information, PCI).
  • msg3 includes an RRC handover confirmation (RRC handover confirm) message generated by the RRC layer, which carries the C-RNTI of the terminal device.
  • RRC handover confirm RRC handover confirmation
  • msg3 may also carry information such as a buffer status report (BSR).
  • BSR buffer status report
  • msg3 may include the C-RNTI of the terminal device.
  • uplink transmission usually uses terminal device-specific information. For example, using C-RNTI or the like to scramble the data carried in the uplink shared channel (UL-SCH). But the conflict has not been resolved at this time, so when scrambling msg3 cannot be based on C-RNTI, only TC-RNTI can be used.
  • the terminal device can transmit msg3 again through hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the redundancy version (RV) version number used in transmission of msg3 scheduled by uplink (UL) authorization (grant) in RAR is 0. If the network device fails to receive msg3, the network device can use TC-RNTI The DCI format 0_0 of the scrambling code is used to schedule the retransmission of MSG3.
  • the DCI format 0_0 of the TC-RNTI scrambling code can include the following: uplink and downlink DCI indication (1 bit), frequency domain resource allocation (the size is determined by the uplink part bandwidth (bandwith part, BWP)), time domain resource allocation (4 bits) , Frequency domain frequency hopping indication (1 bit), modulation and coding scheme (MCS) (5 bits), new data indication (1 bit reserved), RV version (2 bits), HARQ process number (4 Bit reservation), PUSCH power control command word (2 bits), UL/supplementary uplink (SUL) carrier indication (1 bit).
  • Step 4 The network device sends msg4.
  • the network device sends msg4 to the terminal device, and the terminal device receives msg4 to complete contention resolution.
  • msg4 can carry the RRC connection establishment message.
  • msg3 carries the unique identifier of the terminal device, such as C-RNTI or identification information from the core network (such as S-TMSI or a random number)
  • msg4 will carry the unique identifier of the terminal device to specify the terminal device that wins the competition.
  • the PDCCH used for scheduling msg4 can be scrambled using C-RNTI.
  • the method for conflict resolution of the terminal device may be: receive the PDSCH in msg4 and determine the contention in the PDSCH Solve whether the identifier (ID) matches the common control channel (CCCH) service data unit (SDU) sent in msg3.
  • the PDCCH used for scheduling msg4 can be scrambled using TC-RNTI.
  • the terminal equipment that does not win in the contention resolution will re-initiate random access.
  • the terminal device After receiving msg4, the terminal device can feed back the reception result of msg4. If the decoding result of msg4 fed back by the terminal device is NACK, the network device can perform HARQ retransmission on msg4.
  • the network equipment can use the DCI format 1_0 of the C-RNTI or TC-RNTI scrambling code to schedule the initial transmission or retransmission of msg4.
  • the DCI format 1_0 of the TC-RNTI scrambling code can include the following: uplink and downlink DCI indication (1 bit), frequency domain resource allocation (the size is determined by the downlink BWP), time domain resource allocation (4 bits), virtual resource block (virtual resource block) block, VRB) to virtual resource block (physical resource block, PRB) mapping (1 bit), MCS (5 bits), new data indication (1 bit), RV version (2 bits), HARQ process number (4 bits), Downlink allocation indicator (2 bits reserved), PUCCH power control command word (2 bits), PUCCH resource indicator (3 bits), PDSCH-to-HARQ feedback time indicator (3 bits).
  • a 2-step random access method can also be used.
  • One possible method is to send the messages msg1 and msg3 in the 4-step random access process as the first message in the 2-step random access process; use msg2 and msg4 in the 4-step random access process as 2 The second message in the random access process is sent.
  • the 2-step random access process can include the following two steps:
  • Step 1 The terminal device sends the first message (may be called msgA).
  • msgA can include preamble and uplink data (or payload).
  • the uplink data may be carried on an uplink channel, and the uplink channel may be, for example, a physical uplink shared channel (PUSCH).
  • the PUSCH may, for example, carry the identification information of the terminal device and the reason for the RRC request.
  • msgA can carry part or all of the information carried in msg1 and msg3 in the 4-step random access process.
  • Step 2 The network device sends a second message (may be called msgB).
  • msgB may include conflict resolution information, C-RNTI allocation information, TA adjustment information, and so on.
  • msgB can carry part or all of the information carried in msg2 and msg4 in the 4-step random access process.
  • msgB carries conflict resolution information for a single terminal device (including information related to the identification of the terminal device sent by the terminal device in msgA), C-RNTI allocation information, TA adjustment information, and so on.
  • msgB may also carry RRC connection establishment messages and so on.
  • the 5G communication system introduces a fallback mechanism from a 2-step random access process to a 4-step random access process.
  • the terminal device can fall back to the 4-step RACH procedure (the random access procedure shown in FIG. 2), that is, the terminal device only transmits the preamble.
  • the network device can configure the value of N.
  • the terminal device needs to wait for the next random access period to retransmit msgA, resulting in increased delay; for another example, when the number of transmissions of msgA reaches N, the terminal device needs to retransmit msgA. Back to the 4-step RACH process, resulting in increased delay.
  • This application provides a method applied to 2-step RACH, which can reduce the delay of random access.
  • the method 400 includes:
  • S410 The terminal device sends the first message on the first random access resource.
  • the network device receives the first message through the first random access resource.
  • the first message may be msgA.
  • the above-mentioned specific rule is, for example, a reference signal receiving power (RSRP) threshold criterion broadcasted by a network device.
  • RSRP reference signal receiving power
  • the resource for sending the msgA (for example, the first random access resource) may be a periodic resource configured by the network device, for example, a RACH occasion and a PUSCH occasion.
  • S420 The terminal device monitors the second message of 2-step random access in the first time period, and the second message is, for example, msgB.
  • the network device sends the above-mentioned second message in the first time period.
  • the terminal device After the terminal device sends msgA, it can monitor msgB in the RAR window.
  • the RAR window is an example of the second period.
  • the duration of the RAR window can be represented by the number of time slots, and the number of time slots can be configured by system messages or RRC dedicated signaling or high-level signaling (for example, ra-ResponseWindow).
  • the RAR window can be a resource that satisfies the following requirements: it starts from the common search space (CSS) set configured for the terminal device (for example, Type1-PDCCH CSS set), and is located at the time when the terminal device sends msgA (for example, The CORESET used for the terminal device to receive the PDCCH at the earliest time domain position after PUSCH timing), and the CORESET is separated from the last symbol of the terminal device sending msgA by at least M symbols, and any one of the at least M symbols.
  • the length of is the symbol length corresponding to the subcarrier interval of the CSS set (for example, Type1-PDCCH CSS set), and M is an integer greater than 0.
  • the msgB received in the first time period may carry at least one RAR for the msgA sent by at least one terminal device, and the at least one RAR may be divided into the following types of messages:
  • Success RAR (SuccessRAR): If the network device successfully receives the preamble and PUSCH in msgA, the network device can send a successful RAR associated with the msgA, indicating that the network device has successfully received the msgA; the successful RAR can carry TA control information, C -RNTI, conflict resolution ID, etc.;
  • Fallback RAR If the network device successfully receives the preamble in msgA, but fails to receive the PUSCH in the msgA, the network device can send a fallback RAR to the terminal device, so that the terminal device can fall back to the 4-step RACH In the process, after receiving the rollback RAR, the terminal device can send msg3 to the network device.
  • the RAR in msgB can also carry other information, such as BI, which is used to instruct the terminal device how to set the time parameter for retransmitting msgA without receiving the RAR corresponding to the terminal device.
  • the terminal device After receiving the fallback RAR, the terminal device sends msg3 to the network device, and the network device receives msg3 to determine that the terminal device has received msgB. Therefore, the terminal device does not need to feed back the msgB reception status to the network device.
  • the terminal device can send an ACK to the network device, and the network device can determine which successful RAR is successfully received and which successful RAR fails to receive based on the ACK of the terminal device.
  • the network device can retransmit the successful RAR that failed to receive.
  • the failure of terminal equipment to receive msgB includes one of the following situations:
  • the PDCCH with the RA-RNTI scrambling code is detected but the corresponding PDSCH is not received correctly;
  • the PDCCH with the RA-RNTI scrambling code is detected and the corresponding PDSCH is correctly received, but the PDSCH does not include the RAR corresponding to the msgA sent by the terminal device.
  • the successful reception of msgB by the terminal equipment includes the following situations:
  • the PDCCH of the RA-RNTI scrambling code is detected and the corresponding PDSCH is correctly received, and the PDSCH includes the RAR corresponding to the msgA sent by the terminal device.
  • the terminal device fails to receive msgB, the following steps can be performed.
  • S430 The terminal device monitors an additional second message in the second time period, where the additional second message is a second message corresponding to the first message in the first time period.
  • the network The device may send the second access message including the second RAR in the second time period.
  • the second period is the RAR retransmission window.
  • the start time domain position of the second period can be the same as the start time domain position of the first period, or it can be located after the start time domain position of the first period.
  • the end time domain position of the time period is the same, or the start time domain position of the second time period is located after the end time domain position of the first time period.
  • the duration of the first period and the duration of the second period may be equal or different, which is not limited in this application.
  • the above-mentioned additional second message refers to: relative to the second message monitored in the first time period, the second message monitored in the second time period is an additional second message.
  • the additional second message refers to the second message containing the second RAR that may exist in the second time period, or the additional second message refers to the second message containing the second RAR that the terminal device expects to receive The second message.
  • the additional second message should not be construed as implying that the terminal device successfully received the second message containing the first RAR within the first time period, and/or the terminal device was able to successfully receive the second message containing the first RAR within the second time period.
  • Second RAR s second message.
  • the network device does not send the second message containing the first RAR in the first time period, if the terminal device receives the second message in the second time period, the second message is for the terminal device New message; if the network device does not send the second message containing the first RAR in the first time period, if the terminal device receives the second message in the second time period, the second message is sent to the terminal For the device, it is a retransmission message.
  • the first RAR may be at least one of a successful RAR, a fallback RAR, and a BI, and may also be another type of RAR.
  • the specific content of the first RAR is not limited in this application.
  • the second RAR may be a successful RAR.
  • the terminal device can determine, based on these two pieces of information, that the successful RAR received in the second time period is sent through the first random access resource
  • the msgA corresponds to the RAR. Therefore, even if the second period overlaps with the next random access period of the random access period corresponding to the first random access resource, it will not cause the successful RAR to be retransmitted to the next random access period. Confusion in the success of RAR.
  • the above solution adds a time period for monitoring the retransmission of the RAR (ie, the second time period), so that the terminal device has the opportunity to receive the retransmitted RAR (or newly transmitted RAR) before the arrival of the next random access period, compared to the current one.
  • the terminal device needs to wait for the next random access period to receive the RAR solution, and the method 400 reduces the time delay of the 2-step random access process.
  • the second RAR may also be another RAR containing identification information, where the identification information can identify the terminal device corresponding to the RAR, and the identification information can identify the random access period corresponding to the RAR.
  • the end time domain position of the RAR window (that is, an example of the first period) and the start time domain position of the RAR retransmission window (that is, an example of the second period) are the same, and the two windows Located in the same random access period.
  • the terminal device can use the same PDCCH search space to monitor the PDCCH in the two windows, or use different PDCCH search spaces to monitor the PDCCH in the two windows.
  • the terminal device can try to receive various RARs in the RAR window, such as successful RAR, fallback RAR and BI; if the terminal device does not receive any RAR for the terminal device in the RAR window, the terminal device can retransmit Try to receive a successful RAR in the RAR window.
  • the starting time domain position of the RAR window and the starting time domain position of the RAR retransmission window are the same, and the two windows are located in the same random access period.
  • the terminal device can use the same PDCCH search space to monitor the PDCCH in the two windows, or use different PDCCH search spaces to monitor the PDCCH in the two windows.
  • the terminal device can try to receive various RARs in the RAR window, such as successful RAR, fallback RAR and BI; if the terminal device does not receive any RAR for the terminal device in the RAR window, the terminal device can retransmit Try to receive a successful RAR in the RAR window.
  • the end time domain position of the RAR window is the same as the start time domain position of the RAR retransmission window.
  • the end time domain position of the RAR retransmission window is located in the next random access period and is connected to the second random access period.
  • the time domain resources of the incoming resources overlap.
  • the terminal device can use the same PDCCH search space to monitor the PDCCH in the two windows, or use different PDCCH search spaces to monitor the PDCCH in the two windows.
  • the terminal device can choose one of the following two processing methods.
  • the network device may retransmit the second RAR. Therefore, the terminal device may There is no need to retransmit the msgA through the second random access resource, thereby reducing the signaling overhead and power consumption of the terminal device.
  • the network device may be in the second random access resource.
  • the second RAR is newly transmitted or retransmitted in the second period after the time domain resource of the access resource.
  • the terminal device can retransmit msgA through the third random access resource to improve The success rate of random access.
  • the third random access resource may be any available random access resource after the second period.
  • the third random access resource may be the first available random access resource after the second period.
  • the msgA is retransmitted through the second random access resource.
  • the network device may not send the RAR related to the terminal device in the first time period and the second time period. If the terminal device waits for the end of the second period to retransmit msgA, it needs to retransmit msgA through the available random access resources after the second random access resource, thereby increasing the delay of random access.
  • the terminal device can retransmit the msgA without waiting for the end of the second period, which can avoid the increase in the random access delay caused by the above situation.
  • the network device can receive the retransmitted msgA through the second random access resource.
  • the terminal device can monitor the RAR corresponding to the retransmitted msgA in the third period after retransmitting the msgA, where:
  • the RAR corresponding to the retransmitted msgA can be a successful RAR, a fallback RAR or other types of RAR.
  • the network device sends the RAR corresponding to the retransmitted msgA in the third time period.
  • the start time domain position of the RAR window is the same as the start time domain position of the RAR retransmission window, and the end time domain position of the RAR retransmission window is within the next random access period and is the same as the second random access period.
  • the time domain resources of the access resources overlap.
  • the terminal device can use the same PDCCH search space to monitor the PDCCH in the two windows, or use different PDCCH search spaces to monitor the PDCCH in the two windows.
  • the terminal device can determine whether to retransmit msgA through the second random access resource according to the processing method in the embodiment corresponding to FIG. 7 .
  • the apparatus for sending or receiving random access messages includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • This application can divide the functional units of the apparatus for sending or receiving random access messages according to the above-mentioned method examples.
  • each function can be divided into each functional unit, or two or more functions can be integrated into one processing unit.
  • Unit The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in this application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • Fig. 9 is a schematic structural diagram of a device for sending random access messages provided by the present application.
  • the device 900 includes a processing unit 910, a sending unit 920, and a receiving unit 930.
  • the sending unit 920 can execute the sending step under the control of the processing unit 910
  • the receiving unit 930 can execute the receiving step under the control of the processing unit 910.
  • the sending unit 920 is configured to send the first message of two-step random access on the first random access resource
  • the receiving unit 930 is configured to: monitor the second message of two-step random access in the first time period;
  • the receiving unit 930 is further configured to: when the second message is not received, or when the second message does not include the first RAR corresponding to the first message, listen for additional information in the second time period. The second message.
  • the second time period overlaps with the time domain resource of the second random access resource
  • the processing unit 910 is configured to: when the first time domain resource is not received before the time domain resource of the second random access resource During RAR, it is determined not to retransmit the first message on the second random access resource.
  • the sending unit 920 is further configured to: when the first RAR is not received within the second time period, perform 3. Retransmit the first message on the random access resource.
  • the second time period overlaps with the time domain resource of the second random access resource
  • the sending unit 920 is further configured to: when the first time domain resource is not received before the time domain resource of the second random access resource In a RAR, the first message is retransmitted on the second random access resource.
  • the second time period overlaps the third time period
  • the third time period is the listening window of the second message corresponding to the first message sent on the second random access resource
  • the receiving unit 930 It is also used to monitor the second message corresponding to the first message sent on the second random access resource in the third time period.
  • the starting time domain position of the second time period is located after the starting time domain position of the first time period.
  • the start time domain position of the second time period is located after the start time domain position of the first time period, including: the start time domain position of the second time period and the end of the first time period The time domain position is the same.
  • the starting time domain position of the second time period is the same as the starting time domain position of the first time period.
  • the first RAR includes at least one of a successful RAR, a fallback RAR, and BI
  • the additional second message includes a successful RAR
  • the receiving unit 930 is further configured to: receive configuration information, where the configuration information is used to configure the second time period.
  • the apparatus 900 executes the method for receiving feedback information and the beneficial effects produced, refer to the related description in the method embodiment.
  • Fig. 10 is a schematic structural diagram of an apparatus for receiving random access messages provided by the present application.
  • the device 1000 includes a processing unit 1010, a sending unit 1020, and a receiving unit 1030.
  • the sending unit 1020 can execute the sending step under the control of the processing unit 1010
  • the receiving unit 1030 can execute the receiving step under the control of the processing unit 1010.
  • the receiving unit 1020 is configured to: receive the first message of two-step random access on the first random access resource;
  • the sending unit 1030 is configured to send a second message of two-step random access within the first time period, where the second random access message includes at least one RAR;
  • the sending unit 1030 is further configured to: when the at least one RAR does not include the first RAR, or when it is determined that the reception of the first RAR included in the at least one RAR fails, send the first RAR including the second RAR within the second time period. Two messages, the first RAR and the second RAR are RARs corresponding to the first message.
  • the receiving unit 1030 is further configured to: receive the retransmitted first message on a second random access resource; the sending unit 1020 is further configured to: send the retransmitted first message in a third period of time For a second message corresponding to one message, the second time period overlaps the third time period.
  • the sending unit 1020 is further configured to send configuration information, where the configuration information is used to configure the second time period.
  • the starting time domain position of the second time period is located after the starting time domain position of the first time period.
  • the start time domain position of the second time period is located after the start time domain position of the first time period, including: the start time domain position of the second time period and the end of the first time period The time domain position is the same.
  • the starting time domain position of the second time period is the same as the starting time domain position of the first time period.
  • the first RAR includes at least one of a successful RAR, a fallback RAR, and BI
  • the second RAR includes a successful RAR
  • Fig. 11 shows a schematic structural diagram of a communication device provided by the present application.
  • the dotted line in Figure 11 indicates that the unit or the module is optional.
  • the device 1100 may be used to implement the methods described in the foregoing method embodiments.
  • the device 1100 may be a terminal device or a network device or a chip.
  • the device 1100 includes one or more processors 1101, and the one or more processors 1101 can support the device 1100 to implement the methods in the method embodiments corresponding to FIGS. 2 to 8.
  • the processor 1101 may be a general-purpose processor or a special-purpose processor.
  • the processor 1101 may be a central processing unit (CPU).
  • the CPU can be used to control the device 1100, execute a software program, and process data of the software program.
  • the device 1100 may further include a communication unit 1105 to implement signal input (reception) and output (transmission).
  • the device 1100 may be a chip, and the communication unit 1105 may be an input and/or output circuit of the chip, or the communication unit 1105 may be a communication interface of the chip, and the chip may be used as a terminal device or a network device or other wireless communication device made of.
  • the device 1100 may be a terminal device or a network device
  • the communication unit 1105 may be a transceiver of the terminal device or the network device
  • the communication unit 1105 may be a transceiver circuit of the terminal device or the network device.
  • the device 1100 may include one or more memories 1102 with a program 1104 stored thereon.
  • the program 1104 can be run by the processor 1101 to generate instructions 1103 so that the processor 1101 executes the methods described in the foregoing method embodiments according to the instructions 1103.
  • the memory 1102 may also store data.
  • the processor 1101 may also read data stored in the memory 1102. The data may be stored at the same storage address as the program 1104, or the data may be stored at a different storage address from the program 1104.
  • the processor 1101 and the memory 1102 may be provided separately or integrated together, for example, integrated on a system-on-chip (SOC) of the terminal device.
  • SOC system-on-chip
  • the device 1100 may also include an antenna 1106.
  • the communication unit 1105 is configured to implement the transceiver function of the device 1100 through the antenna 1106.
  • each step of the foregoing method embodiment may be completed by a logic circuit in the form of hardware or instructions in the form of software in the processor 1101.
  • the processor 1101 may be a CPU, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices , For example, discrete gates, transistor logic devices, or discrete hardware components.
  • This application also provides a computer program product, which, when executed by the processor 1101, implements the method described in any method embodiment in this application.
  • the computer program product may be stored in the memory 1102, for example, a program 1104.
  • the program 1104 is finally converted into an executable object file that can be executed by the processor 1101 after pre-processing, compilation, assembly, and linking.
  • the present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a computer, the method described in any method embodiment in the present application is implemented.
  • the computer program can be a high-level language program or an executable target program.
  • the computer-readable storage medium is, for example, the memory 1102.
  • the memory 1102 may be a volatile memory or a non-volatile memory, or the memory 1102 may include both a volatile memory and a non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM, DR RAM
  • the disclosed system, device, and method may be implemented in other ways. For example, some features of the method embodiments described above may be ignored or not implemented.
  • the device embodiments described above are merely illustrative.
  • the division of units is only a logical function division. In actual implementation, there may be other division methods, and multiple units or components may be combined or integrated into another system.
  • the coupling between the units or the coupling between the components may be direct coupling or indirect coupling, and the foregoing coupling includes electrical, mechanical, or other forms of connection.
  • the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • system and “network” in this article are often used interchangeably in this article.
  • the term “and/or” in this article is only an association relationship that describes associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, alone There are three cases of B.
  • the character “/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

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

Abstract

Des modes de réalisation de la présente application concernent un procédé permettant de recevoir un message d'accès aléatoire, faisant appel aux étapes suivantes : l'envoi d'un premier message d'accès aléatoire en deux étapes sur une première ressource d'accès aléatoire ; la surveillance d'un second message de l'accès aléatoire en deux étapes dans une première période de temps ; et lorsqu'aucun second message n'est reçu, ou lorsque le second message ne comprend pas une première RAR correspondant au premier message, la surveillance d'un second message supplémentaire dans une seconde période de temps. Selon le procédé ci-dessus, en ajoutant une période de temps pour surveiller une RAR retransmise (c'est-à-dire, la seconde période de temps), un dispositif terminal a une opportunité de recevoir une RAR retransmise ou nouvellement transmise avant la prochaine période d'accès aléatoire, et par comparaison avec la solution dans laquelle un dispositif terminal doit attendre la prochaine période d'accès aléatoire pour recevoir la RAR, le procédé selon la présente application réduit le retard dans le processus d'accès aléatoire en deux étapes.
PCT/CN2019/110802 2019-10-12 2019-10-12 Procédé et appareil permettant de recevoir un message d'accès aléatoire, ou procédé et appareil permettant d'envoyer un message d'accès aléatoire Ceased WO2021068237A1 (fr)

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PCT/CN2019/110802 WO2021068237A1 (fr) 2019-10-12 2019-10-12 Procédé et appareil permettant de recevoir un message d'accès aléatoire, ou procédé et appareil permettant d'envoyer un message d'accès aléatoire
CN201980098935.9A CN114208376B (zh) 2019-10-12 2019-10-12 接收或发送随机接入消息的方法和装置

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