WO2023070682A1 - 随机接入方法、装置、设备及存储介质 - Google Patents

随机接入方法、装置、设备及存储介质 Download PDF

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Publication number
WO2023070682A1
WO2023070682A1 PCT/CN2021/128004 CN2021128004W WO2023070682A1 WO 2023070682 A1 WO2023070682 A1 WO 2023070682A1 CN 2021128004 W CN2021128004 W CN 2021128004W WO 2023070682 A1 WO2023070682 A1 WO 2023070682A1
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WIPO (PCT)
Prior art keywords
message
random access
contention resolution
terminal device
retransmission
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PCT/CN2021/128004
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English (en)
French (fr)
Inventor
胡奕
李海涛
于新磊
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Oppo广东移动通信有限公司
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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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN202180099640.0A priority Critical patent/CN117546588A/zh
Priority to PCT/CN2021/128004 priority patent/WO2023070682A1/zh
Publication of WO2023070682A1 publication Critical patent/WO2023070682A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a random access method, device, device, and storage medium.
  • a contention-based random access procedure and a non-contention-based random access procedure are supported.
  • the terminal device needs to send message 3 (Msg3) after the terminal device successfully receives message 2 (Msg2), and the terminal device needs to send message 3 (Msg3) every After sending message 3 for the first time, the terminal device will start/restart the timer random access contention resolution timer (ra-ContentionResolutionTimer), and monitor the physical downlink control channel (Physical Downlink Control Channel, PDCCH) during the running time of the timer, to Receive message 4 (Msg4), thereby completing random access contention resolution.
  • ra-ContentionResolutionTimer timera-ContentionResolutionTimer
  • PDCCH Physical Downlink Control Channel
  • Embodiments of the present application provide a random access method, device, device, and storage medium, which can avoid unnecessary contention resolution failures. Described technical scheme is as follows:
  • a random access method is provided, the method is performed by a terminal device, and the method includes:
  • the running random access contention resolution timer is stopped, and the message 3 retransmission indication is used to indicate the retransmission of the message 3.
  • a random access method is provided, the method is performed by a network device, and the method includes:
  • the message 3 retransmission indication is used to indicate the retransmission of the message 3, and the terminal device stops the running random access contention resolution timer when receiving the message 3 retransmission indication .
  • a random access device includes: a timer control module;
  • the timer control module is configured to stop the running random access contention resolution timer when a message 3 retransmission indication is received, and the message 3 retransmission indication is used to instruct retransmission of the message 3 pass.
  • a random access device includes: a sending module;
  • the sending module is configured to send a message 3 retransmission indication to the terminal device
  • the message 3 retransmission indication is used to indicate the retransmission of the message 3, and the terminal device stops the running random access contention resolution timer when receiving the message 3 retransmission indication .
  • a terminal device includes a processor
  • the processor is configured to stop the running random access contention resolution timer in the case of receiving the message 3 retransmission instruction, where the message 3 retransmission instruction is used to instruct the message 3 to be retransmitted.
  • a network device includes a transceiver
  • the transceiver is configured to send a message 3 retransmission indication to the terminal device;
  • the message 3 retransmission indication is used to indicate the retransmission of the message 3, and the terminal device stops the running random access contention resolution timer when receiving the message 3 retransmission indication .
  • a computer-readable storage medium where a computer program is stored in the storage medium, and the computer program is used for execution by a processor, so as to implement the above random access method.
  • a chip includes a programmable logic circuit and/or program instructions, and is used to implement the above random access method when the chip is running.
  • a computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads from the The computer-readable storage medium reads and executes the computer instructions, so as to implement the above random access method.
  • the terminal device When the terminal device receives the message 3 retransmission instruction, it stops the running random access contention resolution timer, which can prevent the terminal device from receiving the Msg3 retransmission scheduling instruction and retransmitting Msg3 from random access.
  • the contention resolution timer expires, or the random access contention resolution timer expires during the period between sending the retransmission of message 3 and restarting the random access contention resolution timer, so as to avoid unnecessary contention resolution failure occurs.
  • FIG. 1 is a schematic diagram of a random access process provided by an exemplary embodiment of the present application
  • FIG. 2 is a schematic diagram of a random access process provided by an exemplary embodiment of the present application
  • Fig. 3 is a schematic diagram of a communication system provided by an exemplary embodiment of the present application.
  • Fig. 4 is a schematic diagram of a communication system provided by an exemplary embodiment of the present application.
  • Fig. 5 is a schematic diagram of a communication system provided by an exemplary embodiment of the present application.
  • FIG. 6 is a flowchart of a random access method provided in an exemplary embodiment of the present application.
  • FIG. 7 is a flowchart of a random access method provided in an exemplary embodiment of the present application.
  • FIG. 8 is a schematic diagram of a random access process provided by an exemplary embodiment of the present application.
  • FIG. 9 is a schematic diagram of a random access process provided by an exemplary embodiment of the present application.
  • FIG. 10 is a block diagram of a random access device provided in an exemplary embodiment of the present application.
  • Fig. 11 is a block diagram of a random access device provided by an exemplary embodiment of the present application.
  • Fig. 12 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application.
  • the network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application.
  • the evolution of the technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
  • NTN Non-terrestrial Network
  • Satellite communication is not restricted by the user's region. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. that cannot be equipped with communication equipment or are not covered by communication due to sparse population. For satellite communication, due to a Satellites can cover a large area of the ground, and satellites can orbit the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has great social value.
  • Satellite communication can be covered at a lower cost in remote mountainous areas, poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital gap with developed regions and promoting development of these areas.
  • the distance of satellite communication is long, and the cost of communication does not increase significantly with the increase of communication distance; finally, the stability of satellite communication is high, and it is not limited by natural disasters.
  • LEO Low-Earth Orbit
  • MEO Medium-Earth Orbit
  • GEO Geostationary Earth Orbit
  • HEO High Elliptical Orbit
  • the altitude range of low-orbit satellites is 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours.
  • the signal propagation delay of single-hop communication between users is generally less than 20ms.
  • the maximum satellite visible time is 20 minutes.
  • the signal propagation distance is short, the link loss is small, and the requirements for the transmission power of the user terminal equipment are not high.
  • Satellites in geosynchronous orbit have an orbital altitude of 35786km and a period of 24 hours around the earth.
  • the signal propagation delay of single-hop communication between users is generally 250ms.
  • satellites use multi-beams to cover the ground.
  • a satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. ground area.
  • the random access process is mainly triggered by the following events:
  • the terminal device switches from the RRC idle state (RRC_IDLE state) to the RRC connected state (RRC_CONNECTED state).
  • Radio Resource Control (RRC) connection re-establishment process so that the terminal device can re-establish the wireless connection after the wireless link fails.
  • RRC Radio Resource Control
  • ⁇ Cell switching The terminal device needs to establish uplink synchronization with the new cell.
  • the downlink (DownLink, DL) data arrives, and the UL is in an out-of-sync state at this time.
  • the uplink (UpLink, UL) data arrives.
  • the UL is in an out-of-sync state or there is no physical uplink control channel (Physical Uplink Control Channel, PDCCH) for sending a scheduling request (Scheduling Request, SR). resource.
  • PDCCH Physical Uplink Control Channel
  • the terminal equipment transitions from the RRC inactive state (RRC_INACTIVE state) to the RRC_CONNECTED state.
  • New Radio two random access methods are mainly supported, which are contention-based random access and non-contention-based random access.
  • Fig. 1 is a schematic diagram of a random access process provided by an exemplary embodiment of the present application. As shown in Figure 1, the contention-based random access process is divided into 4 steps, and the non-contention-based random access process is divided into 2 steps. The detailed steps are as follows:
  • the terminal device sends message 1 (Msg1) to the network device.
  • the terminal device selects a physical random access channel (Physical Random Access Channel, PRACH) resource, and sends a selected random access preamble (preamble) on the selected PRACH. If it is random access based on non-contention, the PRACH resource and random access preamble can be specified by the network device.
  • the network device can estimate the uplink timing (Timing) and the size of the scheduling (grant) required by the terminal device to transmit Msg3 based on the random access preamble.
  • the network device sends a random access response (Random Access Response, RAR) to the terminal device.
  • RAR Random Access Response
  • the terminal device After the terminal device sends Msg1, it will open a random access response time window, and monitor the random access-radio network temporary identifier (Random Access-Radio Network Temporary Identifier, RA-RNTI) scrambled physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH).
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • PDCCH Physical Downlink Control Channel
  • the terminal device After the terminal device successfully receives the PDCCH scrambled by the RA-RNTI, the terminal device can obtain the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH, which contains the RAR, and the RAR specifically includes the following information:
  • PDSCH Physical Downlink Shared Channel
  • the header (subheader) of the RAR contains a backoff indicator (Backoff Indicator, BI), which is used to indicate the backoff time for retransmitting Msg1;
  • BI Backoff Indicator
  • Random Access Preamble Identity Document in RAR, the preamble index received by the network device in response;
  • the RAR payload (payload) contains a Timing Advance Group (TAG), which is used to adjust the uplink timing;
  • TAG Timing Advance Group
  • Uplink scheduling (Uplink grant, UL grant), used to schedule the uplink resource indication of Msg3;
  • Temporary Cell-Radio Network Temporary Identifier Temporary Cell-Radio Network Temporary Identifier, TC-RNTI
  • PDCCH initial access
  • Msg4 Temporary Cell-Radio Network Temporary Identifier
  • the terminal device receives a random access response-radio network temporary identifier (Random Access Response-Radio Network Temporary Identifier, RAR-RNTI) scrambled PDCCH, and the RAR contains the preamble identifier (preamble index) sent by itself, then The terminal device considers that the random access response has been successfully received.
  • RAR-RNTI Random Access Response-Radio Network Temporary Identifier
  • the terminal device transmits Msg3 on the network device scheduling resource.
  • Msg3 is mainly used to notify the network device of what event triggers the random access channel (Random Access Channel, RACH) process. For example, if it is an initial access random process, Msg3 will carry the UE ID and establishment cause; if it is RRC re-establishment, it will carry the connection state terminal ID and establishment cause.
  • RACH Random Access Channel
  • Msg3 supports Hybrid Automatic Repeat Request (HARQ) retransmission.
  • HARQ Hybrid Automatic Repeat Request
  • the network device sends Msg4 to the terminal device.
  • the terminal device After sending Msg3 each time, the terminal device will start or restart the random access contention resolution timer (ra-ContentionResolutionTimer), and monitor the Cell-Radio Network Temporary Identifier (C-RNTI) during the running of the timer. ) or PDCCH scrambled by TC-RNTI.
  • ra-ContentionResolutionTimer the random access contention resolution timer
  • C-RNTI Cell-Radio Network Temporary Identifier
  • PDCCH scrambled by TC-RNTI.
  • Msg4 has two functions, one is for contention conflict resolution, and the other is for the network device to transmit the RRC configuration message to the terminal device.
  • contention conflict resolution There are two methods for contention conflict resolution: one is that if the terminal equipment carries C-RNTI in Msg3, Msg4 uses C-RNTI to scramble PDCCH scheduling. The other is that if the terminal device does not carry C-RNTI in Msg3, such as initial access, Msg4 uses TC-RNTI scrambled PDCCH scheduling, and the conflict resolution is that the terminal device receives the PDSCH of Msg4 and matches the PDSCH in the PDSCH Common Control Channel Service Data Unit (Common Control Channel Service Data Unit, CCCH SDU) implementation.
  • Common Control Channel Service Data Unit Common Control Channel Service Data Unit
  • the terminal device After the terminal device sends Msg3 each time, the terminal device will start/restart the random access contention resolution timer (ra-ContentionResolutionTimer), and monitor the PDCCH during the running time of the timer to Receive Msg4. If the terminal device has not received the PDCCH scrambled by the C-RNTI or TC-RNTI until the random access contention resolution timer expires, it considers that this random access has failed, and the terminal device will resend Msg1. When the number of times the terminal device sends Msg1 reaches a certain threshold, the terminal device will indicate to the upper layer that a random access problem has occurred.
  • ra-ContentionResolutionTimer the random access contention resolution timer
  • the random access contention resolution timer starts at the next time symbol after the terminal device sends Msg3 each time, and the timer duration is configured by the network.
  • the wireless signal transmission round trip delay (Round Trip Time, RTT) between the terminal equipment and the base station is greatly increased.
  • RTT Red Trip Time
  • random access in the NTN system At the starting time of the contention resolution timer, a time offset is introduced on the basis of the original TN. Based on the relevant NTN standardization conclusion: the time offset is UE-gNB RTT. That is: in the NTN system, the terminal device starts or restarts the random access contention resolution timer after sending Msg3 each time and after experiencing the UE-gNB RTT duration.
  • the terminal device will stop the random access contention resolution timer only when it receives the Msg4. However, in the case of receiving the PDCCH for scheduling the retransmission of Msg3, the random access contention resolution timer will be restarted only after the retransmission of Msg3 is sent.
  • the start time of the random access contention resolution timer is delayed by one UE-gNB RTT time compared with the TN system, after the terminal device sends the Msg3 retransmission, restart the random access contention resolution timer During the period before the router, the original random access contention resolution timer continues to run, and the timer continues to run for at least one UE-gNB RTT duration compared to the TN system.
  • the terminal device completes the retransmission of Msg3, before the time when the random access contention resolution timer is restarted, the originally running random access contention resolution timer has timed out.
  • the terminal device considers that the contention resolution fails, and the terminal device needs to retry the random access.
  • the terminal device should continue to monitor the scheduling of Msg4 after sending the retransmission of Msg3, and should not consider the contention resolution failure early.
  • the terminal device initially transmits Msg3, and after waiting for the UE-gNB RTT time, starts the random access contention resolution timer at the time point t2.
  • the terminal device receives the PDCCH at time t3, which is used to indicate the retransmission of Msg3, and the terminal device retransmits Msg3 at time t4 accordingly, and the terminal device needs to wait for UE-gNB
  • the random access contention resolution timer is restarted at time t5.
  • the terminal device considers that the contention resolution fails, and needs to retry the random access.
  • the terminal device when the terminal device receives the Msg3 retransmission instruction, it stops the running random access contention resolution timer, which can prevent the terminal device from receiving the Msg3 retransmission scheduling instruction until the retransmission During the period when Msg3 is transmitted, the random access contention resolution timer expires, or the random access contention resolution timer expires during the period from the retransmission of Msg3 to the restart of the random access contention resolution timer , so as to avoid unnecessary competition to solve the failure situation.
  • the embodiment of the present application can be applied to the NTN system, as shown in FIG. 3 and FIG. 4 , and can also be applied to the TN system, as shown in FIG. 5 .
  • FIG. 3 shows a schematic diagram of an NTN system
  • the communication satellites in the NTN system are transparent payload satellites.
  • the NTN system includes: terminal equipment 10 , satellite 20 , NTN gateway 30 , access network equipment 40 and core network equipment 50 .
  • Communication between the terminal device 10 and the access network device 40 can be performed through an air interface (such as a Uu interface).
  • the access network device 40 can be deployed on the ground, and the uplink and downlink communication between the terminal device 10 and the access network device 40 can be relayed and transmitted through the satellite 20 and the NTN gateway 30 (usually located on the ground).
  • the terminal device 10 sends the uplink signal to the satellite 20, and the satellite 20 forwards the above uplink signal to the NTN gateway 30, and then the NTN gateway 30 forwards the above uplink signal to the access network device 40, followed by the access
  • the network device 40 sends the above-mentioned uplink signal to the core network device 50 .
  • the downlink signal from the core network equipment 50 is sent to the access network equipment 40, and the access network equipment 40 sends the downlink signal to the NTN gateway 30, and the NTN gateway 30 forwards the above downlink signal to the satellite 20, and then the The satellite 20 forwards the above-mentioned downlink signal to the terminal device 10 .
  • FIG. 4 shows a schematic diagram of another NTN system, in which the communication satellite is a regenerative forwarding (regenerative payload) satellite.
  • the NTN system includes: a terminal device 10 , a satellite 20 , an NTN gateway 30 and a core network device 50 .
  • the functions of the access network device 40 are integrated on the satellite 20 , that is, the satellite 20 has the functions of the access network device 40 .
  • Communication between the terminal device 10 and the satellite 20 can be performed through an air interface (such as a Uu interface).
  • the satellite 20 and the NTN gateway 30 (usually located on the ground) can communicate through a satellite radio interface (Satellite Radio Interface, SRI).
  • SRI Satellite Radio Interface
  • the terminal device 10 sends the uplink signal to the satellite 20, and the satellite 20 forwards the above uplink signal to the NTN gateway 30, and then the NTN gateway 30 sends the above uplink signal to the core network device 50.
  • the downlink signal from the core network device 50 is sent to the NTN gateway 30 , the NTN gateway 30 forwards the downlink signal to the satellite 20 , and then the satellite 20 forwards the downlink signal to the terminal device 10 .
  • FIG. 5 shows a schematic diagram of a TN system.
  • the TN system includes: a terminal device 10 , an access network device 40 and a core network device 50 .
  • Communication between the terminal device 10 and the access network device 40 can be performed through an air interface (such as a Uu interface).
  • the terminal device 10 sends an uplink signal to the access network device 40 , and then the access network device 40 sends the above uplink signal to the core network device 50 .
  • the downlink signal from the core network device 50 is sent to the access network device 40 , and the access network device 40 sends the downlink signal to the terminal device 10 .
  • the access network device 40 is a device for providing wireless communication services for the terminal device 10 .
  • a connection may be established between the access network device 40 and the terminal device 10, so as to perform communication through the connection, including signaling and data interaction.
  • the number of access network devices 40 may be multiple, and two adjacent access network devices 40 may also communicate in a wired or wireless manner.
  • the terminal device 10 can switch between different access network devices 40 , that is, establish connections with different access network devices 40 .
  • the access network device 40 in the cellular communication network may be a base station.
  • a base station is a device deployed in an access network to provide wireless communication functions for terminal equipment 10 .
  • the base station may include various forms of macro base stations, micro base stations, relay stations, access points and so on.
  • the names of devices with base station functions may be different. For example, in 5G NR systems, they are called gNodeB or gNB.
  • the name "base station" may change as communication technology evolves.
  • the above-mentioned devices that provide the wireless communication function for the terminal device 10 are collectively referred to as base stations or access network devices.
  • the terminal device 10 involved in the embodiment of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of user Equipment (User Equipment, UE), mobile station (Mobile Station, MS), terminal device (terminal device) and so on.
  • UE User Equipment
  • MS Mobile Station
  • terminal device terminal device
  • the above-mentioned devices are collectively referred to as terminal devices.
  • UE is used in some places to represent “terminal equipment”.
  • the "network device” may be an access network device (such as a base station) or a satellite.
  • the NTN system may include multiple satellites 20 .
  • One satellite 20 may cover a certain ground area, and provide wireless communication services for the terminal devices 10 on the ground area.
  • the satellite 20 can orbit the earth, and by arranging a plurality of satellites 20, communication coverage of different areas on the earth's surface can be achieved.
  • LTE Long Term Evolution
  • 5G 5th Generation
  • 5G 5th Generation
  • 5G 5th Generation
  • 5G 5th Generation
  • FIG. 6 shows a flowchart of a random access method provided by an embodiment of the present application.
  • the method may include the steps of:
  • Step 602 the network device sends a message 3 retransmission indication to the terminal device.
  • the terminal device is performing a random access process, and the random access process is a contention-based random access process.
  • the contention-based random access process is shown in (a) in FIG. 1 . This will not be repeated here.
  • the terminal device After successfully receiving message 2, the terminal device sends message 3 on the resources scheduled by the network device.
  • Message 3 is information used for contention resolution in the random access process.
  • the information carried in the message 3 includes at least one of the following: a terminal identifier (UE ID), a connected terminal identifier, and an establishment cause.
  • message 3 supports HARQ retransmission.
  • the message 3 retransmission indication is used to indicate to retransmit the message 3.
  • the network device fails to receive the message 3 sent by the terminal device, the network device sends a message 3 retransmission indication to the terminal device.
  • the network device fails to parse the message 3 sent by the terminal device, the network device sends a message 3 retransmission indication to the terminal device.
  • the terminal device has sent message 3 to the network device, and the message 3 may be the message 3 initially transmitted or the message 3 retransmitted. That is, the message 3 retransmission indication is used to instruct the terminal device to retransmit the initially transmitted message 3, or the message 3 retransmission indication is used to instruct the terminal device to retransmit the retransmitted message 3 again.
  • Step 604 The terminal device receives the message 3 retransmission indication.
  • the terminal device receives the message 3 retransmission indication sent by the network device.
  • Step 606 The terminal device stops the running random access contention resolution timer.
  • the terminal device After receiving the message 3 retransmission indication, the terminal device immediately stops the running random access contention resolution timer (ra-ContentionResolutionTimer).
  • the random access contention resolution timer is a timer run by the terminal device side. During the running of the timer, the terminal device monitors the PDCCH to receive the message 4 sent by the network device.
  • the random access contention resolution timer is started after the terminal device sends message 3, and is always running. If the timer expires, the terminal device considers that the contention resolution fails, and needs to retry random access.
  • the terminal device before step 602, the terminal device sends message 3, and then starts the random access contention resolution timer, and the random access contention resolution timer is in the running state.
  • the terminal device in a TN system, before step 602, the terminal device sends message 3, and starts a random access contention resolution timer in the first symbol (symbol) thereafter.
  • the terminal device in the NTN system, before step 602, the terminal device sends message 3, and after experiencing a terminal device-next-generation base station round-trip transmission time (UE-gNB RTT)/terminal device-evolved base station round-trip transmission time (UE -eNB RTT) after the first symbol, start the random access contention resolution timer.
  • UE-gNB RTT terminal device-next-generation base station round-trip transmission time
  • UE eNB RTT terminal device-evolved base station round-trip transmission time
  • the terminal device stops the running random access contention resolution timer after receiving the message 3 retransmission indication, therefore, after the terminal device receives the message 3 retransmission indication until the terminal device restarts the random access within the time length of the contention resolution timer, or within the time length between the terminal device receiving the message 3 retransmission instruction and the terminal device retransmitting message 3, the random access contention resolution timer will not expire, and the terminal device considers Contention resolution fails and random access needs to be retried.
  • the terminal device when the terminal device receives the message 3 retransmission instruction, it stops the running random access contention resolution timer, which can prevent the terminal device from retransmitting the scheduling instruction after receiving the instruction Msg3.
  • the random access contention resolution timer expires during the period until the retransmission of Msg3, or the random access contention resolution occurs within the period from the retransmission of message 3 to the restart of the random access contention resolution timer. The problem of timer overtime, so as to avoid the occurrence of unnecessary competition and resolution failure.
  • the terminal device since the network device schedules the terminal device to perform message 3 retransmission through the message 3 retransmission instruction, the terminal device should send message 3 retransmission after receiving the message 3 retransmission instruction, and restart the random access contention resolution timing The device can continue to monitor the scheduling of message 4.
  • FIG. 7 shows a flowchart of a random access method provided by an embodiment of the present application.
  • the method may include the steps of:
  • Step 702 The terminal device sends message 3.
  • the message 3 is the message 3 initially transmitted by the terminal device, or the message 3 is the message 3 retransmitted by the terminal device.
  • Step 704 the network device receives message 3.
  • the network device receives the message 3 sent by the terminal device.
  • the message 3 is the message 3 initially transmitted by the terminal device, or the message 3 is the message 3 retransmitted by the terminal device.
  • Step 706 The terminal device starts a random access contention resolution timer.
  • the terminal device Since the terminal device sent message 3 in step 702, the terminal device needs to start the random access contention resolution timer, and monitor the PDCCH during the operation of the random access contention resolution timer to receive the message 4 sent by the network device .
  • step 706 when the method is applied to the NTN system, step 706 includes:
  • the terminal device After sending message 3, the terminal device starts a random access contention resolution timer in the first time domain unit after the second time offset.
  • the second time offset refers to a time offset value between the time point when the message 3 is sent and the time point when the random access contention resolution timer is started.
  • the second time offset includes at least one of the following: UE-gNB RTT, UE-eNB RTT. It can be understood that the second time offset is the RTT value between the terminal device and the network device in the NTN system. With the evolution of the communication system, the second time offset is not limited to the above-mentioned UE-gNB RTT and UE - eNB RTT.
  • the time domain unit includes at least one of the following: frame (frame), subframe (subframe), time slot (slot) and symbol (symbol).
  • frame frame
  • subframe subframe
  • slot time slot
  • symbol symbol
  • step 706 when the method is applied to a TN system, step 706 includes:
  • the terminal device starts the random access contention resolution timer.
  • the time domain unit includes at least one of the following: frame, subframe, time slot and symbol.
  • the terminal device starts a random access contention resolution timer.
  • step 704 and step 706 is not limited in this embodiment of the present application.
  • step 704 is executed first, the network device first receives the message 3, and then step 706 is executed, and the terminal device starts a random access contention resolution timer.
  • step 706 is executed first, the terminal device first starts the random access contention resolution timer, and then step 704 is executed, and the network device receives message 3 again.
  • Step 708 The network device sends a message 3 retransmission indication to the terminal device.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by the TC-RNTI. That is, the network device schedules the terminal device to retransmit message 3 through the PDCCH scrambled by the TC-RNTI.
  • Step 710 The terminal device receives the message 3 retransmission indication.
  • the terminal device receives the message 3 retransmission indication sent by the network device.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by the TC-RNTI.
  • Step 712 The terminal device stops the running random access contention resolution timer.
  • the terminal device After receiving the message 3 retransmission indication, the terminal device stops the random access contention resolution timer started running in step 706 . It can be understood that since the terminal device stops the running random access contention resolution timer, the terminal device does not need to continue to monitor the PDCCH.
  • Step 714 the terminal device sends the retransmitted message 3.
  • the network device schedules the terminal device to perform Msg3 retransmission through the message 3 retransmission instruction, after receiving the message 3 retransmission instruction, the terminal device sends the Msg3 retransmission on the time-frequency domain resource scheduled by the message 3 retransmission instruction pass.
  • Step 716 The network device receives the retransmitted message 3.
  • the network device receives the message 3 retransmitted by the terminal device.
  • Step 718 The terminal device restarts the random access contention resolution timer.
  • the terminal device Since the terminal device sent the retransmitted message 3 in step 714, the terminal device needs to restart the random access contention resolution timer, and continue to monitor the PDCCH again during the running of the restarted random access contention resolution timer. , to receive the message 4 sent by the network device.
  • the provided method is applicable to the NTN system; or, the provided method is applicable to the NTN system and the TN system. That is, after receiving the message 3 retransmission indication, the operation of stopping the running random access contention resolution timer is only applicable to the NTN system, or, after receiving the message 3 retransmission indication, stopping the running random access contention timer The operation of entering the contention resolution timer is applicable to both the NTN system and the TN system.
  • the NTN system refers to a communication system that uses satellite communication to provide services to ground users.
  • the TN system refers to a communication system that does not use satellite communication to provide services to ground users.
  • FIG. 5 details are not described here.
  • step 718 when the method is applied to the NTN system, step 718 includes:
  • the terminal device After sending the retransmitted message 3, at the first time domain unit after the first time offset, the terminal device restarts the random access contention resolution timer.
  • the first time offset refers to the time offset value between the time point when the message 3 is retransmitted and the time point when the random access contention resolution timer is restarted.
  • the first time offset is the same as the second time offset, or the first time offset is different from the second time offset.
  • the first time offset includes at least one of the following: UE-gNB RTT, UE-eNB RTT. It can be understood that the first time offset is the RTT value between the terminal device and the network device in the NTN system. With the evolution of the communication system, the first time offset is not limited to the above-mentioned UE-gNB RTT and UE - eNB RTT.
  • the time domain unit includes at least one of the following: frame, subframe, time slot and symbol.
  • the terminal device restarts the random access contention resolution timer at the first symbol after the first time offset.
  • step 718 when the method is applied to a TN system, step 718 includes:
  • the terminal device restarts the random access contention resolution timer.
  • the time domain unit includes at least one of the following: frame, subframe, time slot and symbol.
  • the terminal device restarts the random access contention resolution timer.
  • step 716 and step 7118 is not limited in this embodiment of the present application.
  • step 716 is executed first, and the network device first receives the retransmitted message 3, and then step 718 is executed, and the terminal device restarts the random access contention resolution timer.
  • step 718 is executed first, and the terminal device restarts the random access contention resolution timer first, and then step 716 is executed, and the network device receives the retransmitted message 3 again.
  • the terminal device when the terminal device receives the message 3 retransmission instruction, it stops the running random access contention resolution timer, which can prevent the terminal device from retransmitting the scheduling instruction after receiving the instruction Msg3.
  • the random access contention resolution timer expires during the period until the retransmission of Msg3, or the random access contention resolution occurs within the period from the retransmission of message 3 to the restart of the random access contention resolution timer. The problem of timer overtime, so as to avoid the occurrence of unnecessary competition and resolution failure.
  • the terminal device after receiving the message 3 retransmission instruction, the terminal device will send message 3 retransmission, restart the random access contention resolution timer to continue monitoring the scheduling of message 4, and ensure random access continuation of the process.
  • the network device since the terminal device receives the retransmission instruction of message 3 until the time point when the terminal device restarts the random access contention resolution timer, the network device will not send the message 4. Scheduling, therefore, when the terminal device receives the message 3 retransmission instruction, it stops the running random access contention resolution timer, and the terminal device will not perform unnecessary PDCCH monitoring, which has the effect of saving power.
  • the terminal device initially transmits Msg3, and after waiting for the UE-gNB RTT time, starts the random access contention resolution timer at the time point t2.
  • the terminal device receives the PDCCH scrambled by TC-RNTI at time t3, which is used to indicate the retransmission of Msg3, and the terminal device stops the running random access at time t3. Enter the contention resolution timer.
  • the terminal device sends the retransmission of Msg3, and after sending the retransmission of Msg3, waits for the UE-gNB RTT time, and restarts the random access contention resolution timer at time t5.
  • the terminal device initially transmits Msg3, and then starts a random access contention resolution timer.
  • the terminal equipment receives the PDCCH scrambled by TC-RNTI at time t2, and the PDCCH is used to indicate the retransmission of Msg3, and the terminal equipment stops the running random access at time t2. Enter the contention resolution timer.
  • the terminal device sends the retransmission of Msg3, and immediately restarts the random access contention resolution timer after sending the retransmission of Msg3.
  • FIG. 10 shows a block diagram of a random access device provided by an embodiment of the present application.
  • the apparatus has the function of implementing the above example method on the terminal device side, and the function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the apparatus may be the terminal device described above, or may be set in the terminal device.
  • the device 1000 may include: a timer control module 1002;
  • the timer control module 1002 is configured to stop the running random access contention resolution timer when receiving the message 3 retransmission indication, and the message 3 retransmission indication is used to indicate that the message 3 Retransmission.
  • the device is suitable for NTN system
  • the device is applicable to the NTN system and TN system.
  • the device further includes: a sending module
  • the sending module is configured to send the retransmitted message 3;
  • the timer control module 1002 is configured to restart the random access contention resolution timer.
  • the timer control module 1002 is configured to restart the random access contention resolution timer at the first time domain unit after the first time offset after sending the retransmitted message 3 .
  • the first time offset includes at least one of the following: UE-gNB RTT, UE-eNB RTT.
  • the timer control module 1002 is configured to restart the random access contention resolution timer in the first time domain unit after sending the retransmitted message 3 .
  • the device further includes: a sending module
  • the sending module is configured to send the message 3;
  • the timer control module 1002 is configured to start the random access contention resolution timer.
  • the timer control module 1002 is configured to start the random access contention resolution timer at the first time domain unit after the second time offset after sending the message 3 .
  • the second time offset is the same as the first time offset
  • the second time offset is different from the first time offset, and the first time offset is when the device restarts the random access contention resolution timing after sending the retransmitted message 3 The time offset experienced by the device.
  • the second time offset includes at least one of the following:
  • UE-gNB RTT UE-gNB RTT
  • UE-eNB RTT UE-eNB RTT
  • the timer control module 1002 is configured to start the random access contention resolution timer in the first time domain unit after sending the message 3 .
  • the time domain unit includes at least one of the following: frame, subframe, time slot and symbol.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by TC-RNTI.
  • FIG. 11 shows a block diagram of a random access apparatus provided by an embodiment of the present application.
  • the apparatus has the function of realizing the above-mentioned method example on the network device side, and the function may be realized by hardware, or may be realized by executing corresponding software by hardware.
  • the apparatus may be the network device described above, or may be set in the network device.
  • the device 1100 may include: a sending module 1102;
  • the sending module 1102 is configured to send a message 3 retransmission indication to the terminal device;
  • the message 3 retransmission indication is used to indicate the retransmission of the message 3, and the terminal device stops the running random access contention resolution timer when receiving the message 3 retransmission indication .
  • the device is suitable for NTN system
  • the device is applicable to the NTN system and TN system.
  • the device further includes: a receiving module
  • the receiving module is configured to receive the retransmitted message 3 after sending the message 3 retransmission indication to the terminal device.
  • the device further includes: a receiving module
  • the receiving module is configured to receive the message 3 before sending the message 3 retransmission indication to the terminal device.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by TC-RNTI.
  • the device provided by the above embodiment realizes its functions, it only uses the division of the above-mentioned functional modules as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • FIG. 12 shows a schematic structural diagram of a communication device (terminal device or network device) provided by an embodiment of the present application.
  • the communication device may include: a processor 1201 , a receiver 1202 , a transmitter 1203 , a memory 1204 and a bus 1205 .
  • the processor 1201 includes one or more processing cores, and the processor 1201 executes various functional applications and performs random access by running software programs and modules.
  • the receiver 1202 and the transmitter 1203 can be realized as a transceiver 1206, and the transceiver 1206 can be a communication chip.
  • the memory 1204 is connected to the processor 1201 through the bus 1205 .
  • the memory 1204 may be used to store a computer program, and the processor 1201 is used to execute the computer program, so as to implement various steps performed by the terminal device in the foregoing method embodiments.
  • the memory 1204 can be realized by any type of volatile or non-volatile storage device or their combination, and the volatile or non-volatile storage device includes but not limited to: random access memory (Random-Access Memory, RAM) And read-only memory (Read-Only Memory, ROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), flash memory or other solid-state storage technologies, compact disc read-only memory (CD-ROM), high-density digital video disc (Digital Video Disc, DVD) or other optical storage, tape cartridges, tapes, disks storage or other magnetic storage devices.
  • RAM Random-Access Memory
  • ROM read-only memory
  • EPROM erasable programmable read-only memory
  • EPROM erasable programmable Read-Only Memory
  • EEPROM Electrically erasable programmable read-only memory
  • the processor 1201 and the transceiver 1206 involved in the embodiment of the present application may execute the steps performed by the terminal device in any of the methods shown in FIG. 6 to FIG. 7 above, I won't repeat them here.
  • the communication device when the communication device is implemented as a terminal device,
  • the processor 1201 is configured to stop the running random access contention resolution timer in the case of receiving the retransmission indication of message 3, where the retransmission indication of message 3 is used to instruct retransmission of the message 3 .
  • the method is applicable to the NTN system
  • the method is applicable to the NTN system and TN system.
  • the transceiver 1206 is configured to send the retransmitted message 3 after receiving the message 3 retransmission indication;
  • the processor 1201 is configured to restart the random access contention resolution timer.
  • the processor 1201 is configured to restart the random Access contention resolution timer.
  • the first time offset includes at least one of the following:
  • UE-gNB RTT UE-gNB RTT
  • UE-eNB RTT UE-eNB RTT
  • the processor 1201 when the method is applied to the TN system, the processor 1201 is configured to restart the random access contention in the first time domain unit after sending the message 3 Fix timers.
  • the transceiver 1206 is configured to send the message 3 before receiving the retransmission indication of the message 3;
  • the processor 1201 is configured to start the random access contention resolution timer.
  • the processor 1201 when the method is applied to the NTN system, the processor 1201 is configured to, after sending the message 3, start the first time domain unit after the second time offset The random access contention resolution timer.
  • the second time offset is the same as the first time offset
  • the second time offset is different from the first time offset, and the first time offset is when the terminal device restarts the random access contention resolution after sending the retransmitted message 3
  • the time offset experienced by the timer is different from the first time offset, and the first time offset is when the terminal device restarts the random access contention resolution after sending the retransmitted message 3 The time offset experienced by the timer.
  • the second time offset includes at least one of the following:
  • UE-gNB RTT UE-gNB RTT
  • UE-eNB RTT UE-eNB RTT
  • the processor 1201 is configured to start the random access contention resolution timer in the first time domain unit after sending the message 3 .
  • the time domain unit includes at least one of the following: frame, subframe, time slot and symbol.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by the TC-RNTI.
  • the transceiver 1206 involved in the embodiment of the present application can execute the steps performed by the network device in any of the methods shown in FIG. 6 to FIG. 7 above, which are not repeated here repeat.
  • the communication device when the communication device is implemented as a network device,
  • the transceiver 1206 is configured to send a message 3 retransmission indication to the terminal device;
  • the message 3 retransmission indication is used to indicate the retransmission of the message 3, and the terminal device stops the running random access contention resolution timer when receiving the message 3 retransmission indication .
  • the method is applicable to the NTN system
  • the method is applicable to the NTN system and TN system.
  • the transceiver 1206 is configured to receive the retransmitted message 3 after sending the message 3 retransmission indication to the terminal device.
  • the transceiver 1206 is configured to receive the message 3 before sending the message 3 retransmission indication to the terminal device.
  • the message 3 retransmission indication is carried in the PDCCH.
  • the PDCCH is scrambled by the TC-RNTI.
  • An embodiment of the present application also provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used to be executed by a processor of a terminal device, so as to implement the above random access method on the terminal device side , or, the computer program is used to be executed by a processor of the network device, so as to implement the above random access method on the network device side.
  • the computer-readable storage medium may include: a read-only memory (Read-Only Memory, ROM), a random-access memory (Random-Access Memory, RAM), a solid-state hard drive (Solid State Drives, SSD) or an optical disc.
  • the random access memory may include resistive random access memory (Resistance Random Access Memory, ReRAM) and dynamic random access memory (Dynamic Random Access Memory, DRAM).
  • the embodiment of the present application also provides a chip, the chip includes a programmable logic circuit and/or program instructions, and when the chip is run on the terminal device, it is used to implement the above random access method on the terminal device side, or , when the chip runs on the network device, it is used to implement the above random access method on the network device side.
  • the embodiment of the present application also provides a computer program product or computer program, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and the processor of the terminal device reads from the computer
  • the readable storage medium reads and executes the computer instructions to implement the above random access method on the terminal device side
  • the processor of the network device reads and executes the computer instructions from the computer-readable storage medium to implement The above random access method on the network device side is realized.
  • the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.
  • the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.
  • the "plurality” mentioned herein means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently.
  • the character “/” generally indicates that the contextual objects are an "or” relationship.
  • the numbering of the steps described herein only exemplarily shows a possible sequence of execution among the steps.
  • the above-mentioned steps may not be executed according to the order of the numbers, such as two different numbers
  • the steps are executed at the same time, or two steps with different numbers are executed in the reverse order as shown in the illustration, which is not limited in this embodiment of the present application.
  • the functions described in the embodiments of the present application may be implemented by hardware, software, firmware or any combination thereof.
  • the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a general purpose or special purpose computer.

Abstract

本申请公开了一种随机接入方法、装置、设备及存储介质，涉及通信技术领域。该方法由终端设备执行，该方法包括：在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。基于本申请实施例所提供的方案，可以防止终端设备在接收到指示Msg3重传调度指示到重传Msg3的这段时间内发生随机接入竞争解决定时器超时的问题，或者在发送完消息3重传到重新启动随机接入竞争解决定时器的这段时间内发生随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生。

Description

随机接入方法、装置、设备及存储介质 技术领域
本申请实施例涉及通信技术领域，特别涉及一种随机接入方法、装置、设备及存储介质。
背景技术
在通信系统中，支持基于竞争的随机接入过程和基于非竞争的随机接入过程。
基于竞争的随机接入过程相较于基于非竞争的随机接入过程而言，在终端设备成功接收消息2(Msg2)之后，终端设备还需要发送消息3(Msg3)，并且，终端设备在每次发送消息3之后，终端设备将启动/重启定时器随机接入竞争解决定时器(ra-ContentionResolutionTimer)，并在该定时器运行时间内监听物理下行控制信道(Physical Downlink Control Channel，PDCCH)，以接收消息4(Msg4)，从而完成随机接入竞争解决。
发明内容
本申请实施例提供了一种随机接入方法、装置、设备及存储介质，可以避免不必要的竞争解决失败情况的发生。所述技术方案如下：
根据本申请实施例的一个方面，提供了一种随机接入方法，所述方法由终端设备执行，所述方法包括：
在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
根据本申请实施例的一个方面，提供了一种随机接入方法，所述方法由网络设备执行，所述方法包括：
向终端设备发送消息3重传指示；
其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
根据本申请实施例的一个方面，提供了一种随机接入装置，所述装置包括：定时器控制模块；
所述定时器控制模块，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
根据本申请实施例的一个方面，提供了一种随机接入装置，所述装置包括：发送模块；
所述发送模块，用于向终端设备发送消息3重传指示；
其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
根据本申请实施例的一个方面，提供了一种终端设备，所述终端设备包括 处理器；
所述处理器，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
根据本申请实施例的一个方面，提供了一种网络设备，所述网络设备包括收发器；
所述收发器，用于向终端设备发送消息3重传指示；
其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
根据本申请实施例的一个方面，提供了一种计算机可读存储介质，所述存储介质中存储有计算机程序，所述计算机程序用于处理器执行，以实现上述随机接入方法。
根据本申请实施例的一个方面，提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片运行时，用于实现上述随机接入方法。
根据本申请实施例的一个方面，提供了一种计算机程序产品或计算机程序，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现上述随机接入方法。
本申请实施例提供的技术方案可以带来如下有益效果：
终端设备在收到消息3重传指示时，停止正在运行的随机接入竞争解决定时器，可以防止终端设备在接收到指示Msg3重传调度指示到重传Msg3的这段时间内发生随机接入竞争解决定时器超时的问题，或者在发送完消息3重传到重新启动随机接入竞争解决定时器的这段时间内发生随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一个示例性实施例提供的随机接入过程的示意图；
图2是本申请一个示例性实施例提供的随机接入过程的示意图；
图3是本申请一个示例性实施例提供的通信系统的示意图；
图4是本申请一个示例性实施例提供的通信系统的示意图；
图5是本申请一个示例性实施例提供的通信系统的示意图；
图6是本申请一个示例性实施例提供的随机接入方法的流程图；
图7是本申请一个示例性实施例提供的随机接入方法的流程图；
图8是本申请一个示例性实施例提供的随机接入过程的示意图；
图9是本申请一个示例性实施例提供的随机接入过程的示意图；
图10是本申请一个示例性实施例提供的随机接入装置的框图；
图11是本申请一个示例性实施例提供的随机接入装置的框图；
图12是本申请一个示例性实施例提供的通信设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
本申请实施例描述的网络架构以及业务场景是为了更加清楚地说明本申请实施例的技术方案，并不构成对本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
在介绍本申请技术方案之前，先对本申请涉及的一些技术知识进行介绍说明。
非地面网络(Non-Terrestrial Network，NTN)技术
目前，相关标准组织正在研究NTN技术，NTN技术一般采用卫星通信的方式向地面用户提供通信服务。相比于地面的蜂窝通信网络，卫星通信具有很多独特的优点。首先，卫星通信不受用户地域的限制，例如一般的陆地通信不能覆盖海洋、高山、沙漠等无法搭设通信设备或由于人口稀少而不做通信覆盖的区域，而对于卫星通信来说，由于一颗卫星即可以覆盖较大的地面，加之卫星可以围绕地球做轨道运动，因此理论上地球上每一个角落都可以被卫星通信覆盖。其次，卫星通信有较大的社会价值。卫星通信在边远山区、贫穷落后的国家或地区都可以以较低的成本覆盖到，从而使这些地区的人们享受到先进的语音通信和移动互联网技术，有利于缩小与发达地区的数字鸿沟，促进这些地区的发展。再次，卫星通信距离远，且通信距离增大通讯的成本没有明显增加；最后，卫星通信的稳定性高，不受自然灾害的限制。
通信卫星按照轨道高度的不同分为低地球轨道(Low-Earth Orbit，LEO)卫星、中地球轨道(Medium-Earth Orbit，MEO)卫星、地球同步轨道(Geostationary Earth Orbit，GEO)卫星、高椭圆轨道(High Elliptical Orbit，HEO)卫星等等。目前阶段主要研究的是LEO和GEO。
1、LEO
低轨道卫星高度范围为500km～1500km，相应轨道周期约为1.5小时～2小时。用户间单跳通信的信号传播延迟一般小于20ms。最大卫星可视时间20分钟。信号传播距离短，链路损耗少，对用户终端设备的发射功率要求不高。
2、GEO
地球同步轨道卫星，轨道高度为35786km，围绕地球旋转周期为24小时。用户间单跳通信的信号传播延迟一般为250ms。
为了保证卫星的覆盖以及提升整个卫星通信系统的系统容量，卫星采用多波束覆盖地面，一颗卫星可以形成几十甚至数百个波束来覆盖地面；一个卫星波束可以覆盖直径几十至上百公里的地面区域。
随机接入过程
随机接入过程主要由如下事件触发：
·终端设备初始接入时建立无线连接：终端设备从RRC空闲态(RRC_IDLE状态)切换至RRC连接态(RRC_CONNECTED状态)。
·无线资源控制(Radio ResourceControl，RRC)连接重建过程：以便终端设备在无线链路失败后重建无线连接。
·小区切换：终端设备需要与新的小区建立上行同步。
·在RRC_CONNECTED状态下，下行链路(DownLink，DL)数据到达， 此时UL处于失步状态。
·在RRC_CONNECTED状态下，上行链路(UpLink，UL)数据到达，此时UL处于失步状态或者没有用于发送调度请求(Scheduling Request，SR)的物理上行控制信道(Physical Uplink Control Channel，PDCCH)资源。
·SR失败。
·来自RRC的同步重配置请求。
·终端设备从RRC非激活态(RRC_INACTIVE状态)转换为RRC_CONNECTED状态。
·在辅小区(Secondary Cell，SCell)添加过程中建立时间校准。
·请求其他系统消息(System Information，SI)。
·波束失败恢复。
在新空口(New Radio，NR)中，主要支持两种随机接入方式，分别为基于竞争的随机接入方式和基于非竞争的随机接入方式。
图1是本申请一个示例性实施例提供的随机接入过程的示意图。如图1所示，基于竞争的随机接入过程分为4步，基于非竞争的随机接入过程分为2步。详细的步骤如下：
(1)终端设备向网络设备发送消息1(Msg1)。
终端设备选择物理随机接入信道(Physical Random Access Channel，PRACH)资源，并在选择的PRACH上发送选择的随机接入前导码(preamble)。如果是基于非竞争的随机接入，PRACH资源和随机接入前导码可以由网络设备指定。网络设备基于随机接入前导码可以估计上行定时(Timing)，和终端设备传输Msg3所需要的调度(grant)大小。
(2)网络设备发送随机接入响应(Random Access Response，RAR)给终端设备。
终端设备发送Msg1之后，会开启一个随机接入响应时间窗，在该随机接入响应时间窗内监测随机接入无线网络临时标识(Random Access-Radio Network Temporary Identifier，RA-RNTI)加扰的物理下行控制信道(Physical Downlink Control Channel，PDCCH)。其中，RA-RNTI跟终端设备发送Msg1所使用的PRACH时频资源有关。
终端设备成功接收到RA-RNTI加扰的PDCCH之后，终端设备能够获得该PDCCH调度的物理下行共享信道(Physical Downlink Shared Channel，PDSCH)，其中包含了RAR，RAR具体包含以下信息：
RAR的包头(subheader)中包含回退指示(Backoff Indicator，BI)，用于指示重传Msg1的回退时间；
RAR中的随机接入前导码标识(Random Access Preamble Identity Document，RAPID)，网络设备响应收到的前导码标识(preamble index)；
RAR的载荷(payload)中包含了定时提前组(Timing Advance Group，TAG)，用于调整上行定时；
上行调度(Uplink grant，UL grant)，用于调度Msg3的上行资源指示；
临时小区-无线网络临时标识(Temporary Cell-Radio Network Temporary Identifier，TC-RNTI)，用于加扰消息4(Msg4)的PDCCH(初始接入)。
如果终端设备接收到随机接入响应-无线网络临时标识(Random Access Response-Radio Network Temporary Identifier，RAR-RNTI)加扰的PDCCH，并且RAR中包含了自己发送的前导码标识(preamble index)，则终端设备认为成 功接收了随机接入响应。
对于基于非竞争的随机接入，终端设备成功接收消息2(Msg2)后，随机接入过程结束。对于基于竞争的随机接入，终端设备成功接收Msg2后，还需要继续传输Msg3和接收Msg4。
(3)终端设备在网络设备调度资源上传输Msg3。
Msg3主要用于通知网络设备该随机接入信道(Random Access Channel，RACH)过程是由什么事件触发。比如，如果是初始接入随机过程，则在Msg3中会携带终端标识(UE ID)和建立原因(establishment cause)；如果是RRC重建，则会携带连接态终端标识和建立原因。
Msg3支持混合自动重传请求(Hybrid Automatic Repeat Request，HARQ)重传。
(4)网络设备向终端设备发送Msg4。
终端设备在每次发送Msg3之后，会启动或者重启随机接入竞争解决定时器(ra-ContentionResolutionTimer)，在该定时器运行期间监测小区-无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)或者TC-RNTI加扰的PDCCH。
Msg4有两个作用，一个是用于竞争冲突解决，第二是网络设备向终端设备传输RRC配置消息。竞争冲突解决有以下两种方式：一种是如果终端设备在Msg3中携带了C-RNTI，则Msg4用C-RNTI加扰的PDCCH调度。另一种是如果终端设备在Msg3中没有携带C-RNTI，比如是初始接入，则Msg4用TC-RNTI加扰的PDCCH调度，冲突的解决是终端设备接收Msg4的PDSCH，通过匹配PDSCH中的公共控制信道服务数据单元(Common Control Channel Service Data Unit，CCCH SDU)实现。
对于上述基于竞争的随机接入过程，终端设备在每次发送Msg3之后，终端设备将启动/重启随机接入竞争解决定时器(ra-ContentionResolutionTimer)，并在该定时器运行时间内监听PDCCH，以接收Msg4。如果直到随机接入竞争解决定时器超时，终端设备还没有接收到C-RNTI或者TC-RNTI加扰的PDCCH，则认为本次随机接入失败，终端设备会重新发送Msg1。当终端设备发送Msg1的次数达到一定门限后，终端设备会向高层指示出现了随机接入的问题。
在地面网络(Terrestrial Network，TN)系统中，随机接入竞争解决定时器起始于终端设备每次发送Msg3之后的下一个时间符号，定时器时长由网络配置。
与TN系统相比，NTN系统中，终端设备与基站之间的无线信号传输往返时延(Round Trip Time，RTT)大幅增加，为了避免终端设备不必要的PDCCH监听，对于NTN系统中的随机接入竞争解决定时器启动时刻，在原来TN基础上引入了一个时间偏移量，基于相关NTN标准化结论：该时间偏移量为UE-gNB RTT。即：NTN系统中，终端设备在每次发送完Msg3并经历UE-gNB RTT时长之后启动或者重启随机接入竞争解决定时器。
基于相关标准协议，终端设备只有在收到Msg4的时候才会停止随机接入竞争解决定时器。而在收到调度Msg3重传的PDCCH的情况下，只会在发送完Msg3重传之后重启随机接入竞争解决定时器。在NTN系统中，由于随机接入竞争解决定时器的启动时间相比TN系统还延后了一个UE-gNB RTT的时间，而在终端设备发送完Msg3重传之后，重启随机接入竞争解决定时器之前的这段时间内，原来的随机接入竞争解决定时器还在继续运行，且该定时器继续运行 的时间相比于TN系统至少增加了一个UE-gNB RTT时长。
那么有可能在终端设备完成Msg3重传之后，重启随机接入竞争解决定时器的时刻之前，原来运行的随机接入竞争解决定时器已超时。而基于相关标准规定，如果随机接入竞争解决定时器超时，则终端设备认为竞争解决失败，终端设备需要重新尝试随机接入。显然，在网络调度Msg3重传的情况下，终端设备应该在发完Msg3重传之后继续监听Msg4的调度，而不应该提早认为竞争解决失败。
示例性的，如图2所示，在t1时间点，终端设备初传Msg3，在等待UE-gNB RTT的时间后，在t2时间点启动随机接入竞争解决定时器。在随机接入竞争解决定时器的运行期间，终端设备在t3时间点接收到PDCCH，该PDCCH用于指示Msg3的重传，终端设备相应在t4时间点重传Msg3，终端设备需要等待UE-gNB RTT的时间后，在t5时间点重启随机接入竞争解决定时器。而在t4时间点和t5时间点之间，随机接入竞争解决定时器超时，因此，终端设备认为竞争解决失败，需要重新尝试随机接入。
在本申请实施例中，针对上述问题，终端设备在收到指示Msg3重传指示时，停止正在运行的随机接入竞争解决定时器，可以防止终端设备在接收到指示Msg3重传调度指示到重传Msg3的这段时间内发生随机接入竞争解决定时器超时的问题，或者在发送完Msg3重传到重新启动随机接入竞争解决定时器的这段时间内发生随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生。
下面，通过几个实施例对本申请技术方案进行介绍说明。
本申请实施例可以应用于NTN系统中，如图3和图4所示，也可以应用于TN系统中，如图5所示。
请参考图3，其示出了一种NTN系统的示意图，该NTN系统中的通信卫星是透明转发(transparent payload)的卫星。如图3所示，该NTN系统包括：终端设备10、卫星20、NTN网关30、接入网设备40和核心网设备50。
终端设备10和接入网设备40之间可通过空口(如Uu接口)进行通信。在图3所示架构中，接入网设备40可以部署在地面，终端设备10和接入网设备40之间的上下行通信，可以通过卫星20和NTN网关30(通常位于地面)进行中转传输。以上行传输为例，终端设备10将上行信号发送给卫星20，卫星20将上述上行信号转发给NTN网关30，再由NTN网关30将上述上行信号转发给接入网设备40，后续由接入网设备40将上述上行信号发送给核心网设备50。以下行传输为例，来自核心网设备50的下行信号发送给接入网设备40，接入网设备40将下行信号发送给NTN网关30，NTN网关30将上述下行信号转发给卫星20，再由卫星20将上述下行信号转发给终端设备10。
请参考图4，其示出了另一种NTN系统的示意图，该NTN系统中的通信卫星是再生转发(regenerative payload)的卫星。如图4所示，该NTN系统包括：终端设备10、卫星20、NTN网关30和核心网设备50。
在图4所示架构中，接入网设备40的功能集成在卫星20上，也即卫星20具备接入网设备40的功能。终端设备10和卫星20之间可通过空口(如Uu接口)进行通信。卫星20和NTN网关30(通常位于地面)之间可通过卫星无线接口(Satellite Radio Interface，SRI)进行通信。
在图4所示架构中，以上行传输为例，终端设备10将上行信号发送给卫星 20，卫星20将上述上行信号转发给NTN网关30，再由NTN网关30将上述上行信号发送给核心网设备50。以下行传输为例，来自核心网设备50的下行信号发送给NTN网关30，NTN网关30将上述下行信号转发给卫星20，再由卫星20将上述下行信号转发给终端设备10。
请参考图5，其示出了一种TN系统的示意图。如图5所示，该TN系统包括：终端设备10、接入网设备40和核心网设备50。
终端设备10和接入网设备40之间可通过空口(如Uu接口)进行通信。以上行传输为例，终端设备10将上行信号发送给接入网设备40，后续由接入网设备40将上述上行信号发送给核心网设备50。以下行传输为例，来自核心网设备50的下行信号发送给接入网设备40，接入网设备40将下行信号发送给终端设备10。
在上述图3、图4和图5所示的网络架构中，接入网设备40是用于为终端设备10提供无线通信服务的设备。接入网设备40与终端设备10之间可以建立连接，从而通过该连接进行通信，包括信令和数据的交互。接入网设备40的数量可以有多个，两个邻近的接入网设备40之间也可以通过有线或者无线的方式进行通信。终端设备10可以在不同的接入网设备40之间进行切换，也即与不同的接入网设备40建立连接。
以蜂窝通信网络为例，蜂窝通信网络中的接入网设备40可以是基站。基站是一种部署在接入网中用以为终端设备10提供无线通信功能的装置。基站可以包括各种形式的宏基站，微基站，中继站，接入点等等。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同，例如在5G NR系统中，称为gNodeB或者gNB。随着通信技术的演进，“基站”这一名称可能会变化。为方便描述，本申请实施例中，上述为终端设备10提供无线通信功能的装置统称为基站或接入网设备。
另外，本申请实施例中涉及的终端设备10，可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备，以及各种形式的用户设备(User Equipment，UE)，移动台(Mobile Station，MS)，终端设备(terminal device)等等。为方便描述，本申请实施例中，上面提到的设备统称为终端设备。在本申请实施例中，有些地方使用“UE”代表“终端设备”。在本申请实施例中，“网络设备”可以是接入网设备(如基站)或者卫星。
另外，以5G NTN系统为例，NTN系统中可以包括多颗卫星20。一颗卫星20可以覆盖一定范围的地面区域，为该地面区域上的终端设备10提供无线通信服务。另外，卫星20可以围绕地球做轨道运动，通过布设多个卫星20，可以实现对地球表面的不同区域的通信覆盖。
另外，在本申请实施例中，名词“网络”和“系统”通常混用，但本领域技术人员可以理解其含义。本申请实施例描述的技术方案可以适用于长期演进(Long Term Evolution，LTE)系统，也可以适用于5G系统，也可以适用于5G NR系统后续的演进系统或者其他通信系统，本申请对此不作限定。
请参考图6，其示出了本申请一个实施例提供的随机接入方法的流程图。该方法可以包括如下步骤：
步骤602：网络设备向终端设备发送消息3重传指示。
在本申请实施例中，终端设备正在进行随机接入过程，且该随机接入过程 是基于竞争的随机接入过程，基于竞争的随机接入过程如图1中的(a)所示，在此不进行赘述。
在基于竞争的随机接入过程中，终端设备在成功接收消息2后，在网络设备所调度的资源上发送消息3，消息3是随机接入过程中用于进行竞争解决的信息。示例性的，消息3中携带的信息包括如下中的至少一种：终端标识(UE ID)、连接态终端标识、建立原因(establishment cause)。
为了保障消息3的传输可靠性，消息3支持HARQ重传。其中，消息3重传指示用于指示对消息3进行重传。示例性的，在网络设备未成功接收到终端设备发送的消息3的情况下，网络设备向终端设备发送消息3重传指示。示例性的，在网络设备未成功解析终端设备发送的消息3的情况下，网络设备向终端设备发送消息3重传指示。
可以理解的是，在步骤602之前，终端设备已向网络设备发送消息3，该消息3可以是初传的消息3，也可以是重传的消息3。也即，消息3重传指示用于指示终端设备对初传的消息3进行重传，或者，消息3重传指示用于指示终端设备对重传的消息3再次进行重传。
步骤604：终端设备接收消息3重传指示。
终端设备接收网络设备下发的消息3重传指示。
步骤606：终端设备停止正在运行的随机接入竞争解决定时器。
在接收到消息3重传指示后，终端设备即刻停止正在运行的随机接入竞争解决定时器(ra-ContentionResolutionTimer)。
其中，随机接入竞争解决定时器是终端设备侧运行的一个定时器，在该定时器的运行期间，终端设备监听PDCCH，以接收网络设备发送的消息4。随机接入竞争解决定时器在终端设备发送消息3后启动，进而一直处于运行状态。如果该定时器运行超时，则终端设备认为竞争解决失败，需要重新尝试随机接入。
在本申请实施例中，在步骤602之前，终端设备发送消息3，然后启动随机接入竞争解决定时器，随机接入竞争解决定时器进而处于运行状态。示例性的，在TN系统中，在步骤602之前，终端设备发送消息3，并在之后的第一个符号(symbol)启动随机接入竞争解决定时器。示例性的，在NTN系统中，在步骤602之前，终端设备发送消息3，并在经历一个终端设备-下一代基站往返传输时间(UE-gNB RTT)/终端设备-演进基站往返传输时间(UE-eNB RTT)时长之后的第一个符号，启动随机接入竞争解决定时器。在终端设备接收到消息3重传指示后，如果该随机接入竞争解决定时器依旧处于运行状态，则停止正在运行的该随机接入竞争解决定时器。
可以理解的是，因为终端设备在接收到消息3重传指示后，就停止了正在运行的随机接入竞争解决定时器，因此，在终端设备接收到消息3重传指示至终端设备重启随机接入竞争解决定时器的时间长度内，或者，在终端设备接收到消息3重传指示至终端设备重传消息3的时间长度内，不会出现随机接入竞争解决定时器超时，进而终端设备认为竞争解决失败，需要重新尝试随机接入的情况。
综上所述，本实施例提供的技术方案，终端设备在收到消息3重传指示时，停止正在运行的随机接入竞争解决定时器，可以防止终端设备在接收到指示Msg3重传调度指示到重传Msg3的这段时间内发生随机接入竞争解决定时器超时的问题，或者在发送完消息3重传到重新启动随机接入竞争解决定时器的这 段时间内发生随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生。
在示例性实施例中，由于网络设备通过消息3重传指示调度终端设备进行消息3重传，终端设备应该在接收消息3重传指示之后，发送消息3重传，重启随机接入竞争解决定时器以继续监听消息4的调度。
请参考图7，其示出了本申请一个实施例提供的随机接入方法的流程图。该方法可以包括如下步骤：
步骤702：终端设备发送消息3。
示例性的，该消息3是终端设备初传的消息3，或者，该消息3是终端设备重传的消息3。
步骤704：网络设备接收消息3。
网络设备接收终端设备发送的消息3。示例性的，该消息3是终端设备初传的消息3，或者，该消息3是终端设备重传的消息3。
步骤706：终端设备启动随机接入竞争解决定时器。
由于终端设备在步骤702中发送了消息3，因此，终端设备需要启动随机接入竞争解决定时器，在该随机接入竞争解决定时器的运行期间，监听PDCCH，以接收网络设备发送的消息4。
在一种可能的实现方式中，在该方法应用于NTN系统的情况下，步骤706包括：
在发送完消息3之后，在经过第二时间偏移之后的第一个时域单元，终端设备启动随机接入竞争解决定时器。
其中，第二时间偏移指的是发送完消息3的时间点至启动随机接入竞争解决定时器的时间点之间的时间偏移值。
可选的，第二时间偏移包括如下中的至少一种：UE-gNB RTT、UE-eNB RTT。可以理解的是，第二时间偏移为NTN系统中，终端设备与网络设备之间的RTT值，随着通信系统的演进，第二时间偏移不限于如上所述的UE-gNB RTT和UE-eNB RTT。
可选的，时域单元包括如下中的至少一种：帧(frame)、子帧(subframe)、时隙(slot)和符号(symbol)。示例性的，在发送完消息3之后，在经过第二时间偏移之后的第一个符号，终端设备启动随机接入竞争解决定时器。
在一种可能的实现方式中，在该方法应用于TN系统的情况下，步骤706包括：
在发送完消息3之后的第一个时域单元，终端设备启动随机接入竞争解决定时器。
可选的，时域单元包括如下中的至少一种：帧、子帧、时隙和符号。示例性的，在发送完消息3之后的第一个符号，终端设备启动随机接入竞争解决定时器。
另外，本申请实施例对步骤704和步骤706的实施顺序不加以限定。示例性的，在NTN系统中，先执行步骤704，网络设备先接收消息3，再执行步骤706，终端设备再启动随机接入竞争解决定时器。示例性的，在TN系统中，先执行步骤706，终端设备先启动随机接入竞争解决定时器，再执行步骤704，网络设备再接收消息3。
步骤708：网络设备向终端设备发送消息3重传指示。
可选的，消息3重传指示携带在PDCCH中。
可选的，该PDCCH由TC-RNTI加扰。也即，网络设备通过TC-RNTI加扰的PDCCH调度终端设备对消息3进行重传。
步骤710：终端设备接收消息3重传指示。
终端设备接收网络设备下发的消息3重传指示。可选的，消息3重传指示携带在PDCCH中。可选的，该PDCCH由TC-RNTI加扰。
步骤712：终端设备停止正在运行的随机接入竞争解决定时器。
在接收到消息3重传指示后，终端设备停止在步骤706中启动运行的随机接入竞争解决定时器。可以理解的是，由于终端设备停止了正在运行的随机接入竞争解决定时器，因此，终端设备不必再继续进行PDCCH监听。
步骤714：终端设备发送重传的消息3。
示例性的，由于网络设备通过消息3重传指示调度终端设备进行Msg3重传，终端设备在接收消息3重传指示之后，在消息3重传指示所调度的时频域资源上，发送Msg3重传。
步骤716：网络设备接收重传的消息3。
网络设备接收终端设备重传的消息3。
步骤718：终端设备重新启动随机接入竞争解决定时器。
由于终端设备在步骤714中发送了重传的消息3，因此，终端设备需要重新启动随机接入竞争解决定时器，在该重新启动的随机接入竞争解决定时器的运行期间，重新继续监听PDCCH，以接收网络设备发送的消息4。
在本申请实施例中，所提供的方法适用于NTN系统；或，所提供的方法适用于NTN系统和TN系统。也即，在接收到消息3重传指示后，停止正在运行的随机接入竞争解决定时器的操作只适用于NTN系统，或者，在接收到消息3重传指示后，停止正在运行的随机接入竞争解决定时器的操作同时适用于NTN系统和TN系统。
其中，NTN系统指的是采用卫星通信的方式向地面用户提供服务的通信系统，如图3和图4所示，TN系统指的是未采用卫星通信的方式向地面用户提供服务的通信系统，如图5所示，在此不进行赘述。
在一种可能的实现方式中，在该方法应用于NTN系统的情况下，步骤718包括：
在发送完重传的消息3之后，在经过第一时间偏移之后的第一个时域单元，终端设备重新启动随机接入竞争解决定时器。
其中，第一时间偏移指的是重传完消息3的时间点至重新启动随机接入竞争解决定时器的时间点之间的时间偏移值。可选的，第一时间偏移与上述第二时间偏移相同，或者，第一时间偏移与上述第二时间偏移不同。
可选的，第一时间偏移包括如下中的至少一种：UE-gNB RTT、UE-eNB RTT。可以理解的是，第一时间偏移为NTN系统中，终端设备与网络设备之间的RTT值，随着通信系统的演进，第一时间偏移不限于如上所述的UE-gNB RTT和UE-eNB RTT。
可选的，时域单元包括如下中的至少一种：帧、子帧、时隙和符号。示例性的，在重传完消息3之后，在经过第一时间偏移之后的第一个符号，终端设备重新启动随机接入竞争解决定时器。
在一种可能的实现方式中，在该方法应用于TN系统的情况下，步骤718包括：
在发送完重传的消息3之后的第一个时域单元，终端设备重新启动随机接入竞争解决定时器。
可选的，时域单元包括如下中的至少一种：帧、子帧、时隙和符号。示例性的，在重传完消息3之后的第一个符号，终端设备重新启动随机接入竞争解决定时器。
另外，本申请实施例对步骤716和步骤7118的实施顺序不加以限定。示例性的，在NTN系统中，先执行步骤716，网络设备先接收重传的消息3，再执行步骤718，终端设备再重新启动随机接入竞争解决定时器。示例性的，在TN系统中，先执行步骤718，终端设备先重新启动随机接入竞争解决定时器，再执行步骤716，网络设备再接收重传的消息3。
综上所述，本实施例提供的技术方案，终端设备在收到消息3重传指示时，停止正在运行的随机接入竞争解决定时器，可以防止终端设备在接收到指示Msg3重传调度指示到重传Msg3的这段时间内发生随机接入竞争解决定时器超时的问题，或者在发送完消息3重传到重新启动随机接入竞争解决定时器的这段时间内发生随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生。
同时，本实施例提供的技术方案，终端设备在收到消息3重传指示后，将发送消息3重传，重启随机接入竞争解决定时器以继续监听消息4的调度，保障了随机接入过程的继续执行。
同时，本实施例提供的技术方案，由于在终端设备在收到消息3重传指示的时间点，直至终端设备重启随机接入竞争解决定时器的时间点，网络设备将不会发送消息4的调度，因此，终端设备在收到消息3重传指示时，停止了正在运行的随机接入竞争解决定时器，终端设备将不会进行不必要的PDCCH监听，起到了节电的效果。
示例性的，结合参考图8对如上本申请所提供的随机接入方法进行说明。
如图8所示，在NTN系统中，在t1时间点，终端设备初传Msg3，在等待UE-gNB RTT的时间后，在t2时间点启动随机接入竞争解决定时器。
在随机接入竞争解决定时器的运行期间，终端设备在t3时间点接收到TC-RNTI加扰的PDCCH，该PDCCH用于指示Msg3的重传，终端设备在t3时间点停止正在运行的随机接入竞争解决定时器。
在t4时间点，终端设备发送Msg3的重传，并在发送完该Msg3的重传后，等待UE-gNB RTT时长，在t5时间点重启随机接入竞争解决定时器。
如图8所示，在t3时间点至t5时间点，由于前一个Msg3对应的随机接入竞争解决定时器已停止运行，因此不会出现该随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生，也不会进行不必要的PDCCH监听，起到了节电的效果。
示例性的，结合参考图9对如上本申请所提供的随机接入方法进行说明。
如图9所示，在TN系统中，在t1时间点，终端设备初传Msg3，并随即启动随机接入竞争解决定时器。
在随机接入竞争解决定时器的运行期间，终端设备在t2时间点接收到TC-RNTI加扰的PDCCH，该PDCCH用于指示Msg3的重传，终端设备在t2时间点停止正在运行的随机接入竞争解决定时器。
在t3时间点，终端设备发送Msg3的重传，并在发送完该Msg3的重传后，随即重启随机接入竞争解决定时器。
如图9所示，在t2时间点至t3时间点，由于前一个Msg3对应的随机接入竞争解决定时器已停止运行，因此不会出现该随机接入竞争解决定时器超时的问题，从而避免不必要的竞争解决失败情况的发生，也不会进行不必要的PDCCH监听，起到了节电的效果。
可以理解的是，上述方法实施例可以单独实施，也可以组合实施，本申请对此不加以限制。
下述为本申请装置实施例，可以用于执行本申请方法实施例。对于本申请装置实施例中未披露的细节，请参照本申请方法实施例。
请参考图10，其示出了本申请一个实施例提供的随机接入装置的框图。该装置具有实现上述终端设备侧的方法示例的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该装置可以是上文介绍的终端设备，也可以设置在终端设备中。如图10所示，该装置1000可以包括：定时器控制模块1002；
所述定时器控制模块1002，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
在一个可选的实施例中，所述装置适用于NTN系统；
或，
所述装置适用于所述NTN系统和TN系统。
在一个可选的实施例中，所述装置还包括：发送模块；
所述发送模块，用于发送重传的所述消息3；
所述定时器控制模块1002，用于重新启动所述随机接入竞争解决定时器。
在一个可选的实施例中，在所述装置应用于所述NTN系统的情况下；
所述定时器控制模块1002，用于在发送完重传的所述消息3之后，在经过第一时间偏移之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
在一个可选的实施例中，所述第一时间偏移包括如下中的至少一种：UE-gNB RTT、UE-eNB RTT。
在一个可选的实施例中，在所述装置应用于所述TN系统的情况下；
所述定时器控制模块1002，用于在发送完重传的所述消息3之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
在一个可选的实施例中，所述装置还包括：发送模块；
所述发送模块，用于发送所述消息3；
所述定时器控制模块1002，用于启动所述随机接入竞争解决定时器。
在一个可选的实施例中，在所述装置应用于NTN系统的情况下；
所述定时器控制模块1002，用于在发送完所述消息3之后，在经过第二时间偏移之后的第一个时域单元，启动所述随机接入竞争解决定时器。
在一个可选的实施例中，所述第二时间偏移与第一时间偏移相同；
或，
所述第二时间偏移与所述第一时间偏移不同，所述第一时间偏移是所述装置在发送完重传的所述消息3之后，重新启动所述随机接入竞争解决定时器所 经历的时间偏移。
在一个可选的实施例中，所述第二时间偏移包括如下中的至少一种：
UE-gNB RTT、UE-eNB RTT。
在一个可选的实施例中，在所述装置应用于TN系统的情况下；
所述定时器控制模块1002，用于在发送完所述消息3之后的第一个时域单元，启动所述随机接入竞争解决定时器。
在一个可选的实施例中，所述时域单元包括如下中的至少一种：帧、子帧、时隙和符号。
在一个可选的实施例中，所述消息3重传指示携带在PDCCH中。
在一个可选的实施例中，所述PDCCH由TC-RNTI加扰。
请参考图11，其示出了本申请一个实施例提供的随机接入装置的框图。该装置具有实现上述网络设备侧的方法示例的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该装置可以是上文介绍的网络设备，也可以设置在网络设备中。如图11所示，该装置1100可以包括：发送模块1102；
所述发送模块1102，用于向终端设备发送消息3重传指示；
其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
在一个可选的实施例中，所述装置适用于NTN系统；
或，
所述装置适用于所述NTN系统和TN系统。
在一个可选的实施例中，所述装置还包括：接收模块；
所述接收模块，用于在向所述终端设备发送所述消息3重传指示之后，接收重传的所述消息3。
在一个可选的实施例中，所述装置还包括：接收模块；
所述接收模块，用于在向所述终端设备发送所述消息3重传指示之前，接收所述消息3。
在一个可选的实施例中，所述消息3重传指示携带在PDCCH中。
在一个可选的实施例中，所述PDCCH由TC-RNTI加扰。
需要说明的一点是，上述实施例提供的装置在实现其功能时，仅以上述各个功能模块的划分进行举例说明，实际应用中，可以根据实际需要而将上述功能分配由不同的功能模块完成，即将设备的内容结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
关于上述实施例中的装置，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。
请参考图12，其示出了本申请一个实施例提供的通信设备(终端设备或网络设备)的结构示意图。该通信设备可以包括：处理器1201、接收器1202、发送器1203、存储器1204和总线1205。
处理器1201包括一个或者一个以上处理核心，处理器1201通过运行软件程序以及模块，从而执行各种功能应用以及进行随机接入。
接收器1202和发送器1203可以实现为一个收发器1206，该收发器1206可 以是一块通信芯片。
存储器1204通过总线1205与处理器1201相连。
存储器1204可用于存储计算机程序，处理器1201用于执行该计算机程序，以实现上述方法实施例中终端设备执行的各个步骤。
此外，存储器1204可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，易失性或非易失性存储设备包括但不限于：随机存储器(Random-Access Memory，RAM)和只读存储器(Read-Only Memory，ROM)、可擦写可编程只读存储器(Erasable Programmable Read-Only Memory，EPROM)、电可擦写可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、闪存或其他固态存储其技术，只读光盘(Compact Disc Read-Only Memory，CD-ROM)、高密度数字视频光盘(Digital Video Disc，DVD)或其他光学存储、磁带盒、磁带、磁盘存储或其他磁性存储设备。
其中，当通信设备实现为终端设备时，本申请实施例涉及的中的处理器1201和收发器1206，可以执行上述图6至图7任一所示的方法中，由终端设备执行的步骤，此处不再赘述。
在一种可能的实现方式中，当通信设备实现为终端设备时，
所述处理器1201，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
可选的，所述方法适用于NTN系统；
或，
所述方法适用于所述NTN系统和TN系统。
可选的，所述收发器1206，用于在接收到所述消息3重传指示之后，发送重传的所述消息3；
所述处理器1201，用于重新启动所述随机接入竞争解决定时器。
可选的，在所述方法应用于所述NTN系统的情况下，所述处理器1201，用于在发送完重传的所述消息3之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
可选的，所述第一时间偏移包括如下中的至少一种：
UE-gNB RTT、UE-eNB RTT。
可选的，在所述方法应用于所述TN系统的情况下，所述处理器1201，用于在发送完所述消息3之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
可选的，所述收发器1206，用于在接收到所述消息3重传指示之前，发送所述消息3；
所述处理器1201，用于启动所述随机接入竞争解决定时器。
可选的，在所述方法应用于NTN系统的情况下，所述处理器1201，用于在发送完所述消息3之后，在经过第二时间偏移之后的第一个时域单元，启动所述随机接入竞争解决定时器。
可选的，所述第二时间偏移与第一时间偏移相同；
或，
所述第二时间偏移与所述第一时间偏移不同，所述第一时间偏移是所述终端设备在发送完重传的所述消息3之后，重新启动所述随机接入竞争解决定时器所经历的时间偏移。
可选的，所述第二时间偏移包括如下中的至少一种：
UE-gNB RTT、UE-eNB RTT。
可选的，在所述方法应用于TN系统的情况下，所述处理器1201，用于在发送完所述消息3之后的第一个时域单元，启动所述随机接入竞争解决定时器。
可选的，所述时域单元包括如下中的至少一种：帧、子帧、时隙和符号。
可选的，所述消息3重传指示携带在PDCCH中。
可选的，所述PDCCH由TC-RNTI加扰。
其中，当通信设备实现为网络设备时，本申请实施例涉及的中的收发器1206，可以执行上述图6至图7任一所示的方法中，由网络设备执行的步骤，此处不再赘述。
在一种可能的实现方式中，当通信设备实现为网络设备时，
所述收发器1206，用于向终端设备发送消息3重传指示；
其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
可选的，所述方法适用于NTN系统；
或，
所述方法适用于所述NTN系统和TN系统。
可选的，所述收发器1206，用于在向所述终端设备发送所述消息3重传指示之后，接收重传的所述消息3。
可选的，所述收发器1206，用于在向所述终端设备发送所述消息3重传指示之前，接收所述消息3。
可选的，所述消息3重传指示携带在PDCCH中。
可选的，所述PDCCH由TC-RNTI加扰。
本申请实施例还提供了一种计算机可读存储介质，所述存储介质中存储有计算机程序，所述计算机程序用于被终端设备的处理器执行，以实现上述终端设备侧的随机接入方法，或，所述计算机程序用于被网络设备的处理器执行，以实现上述网络设备侧的随机接入方法。
可选地，该计算机可读存储介质可以包括：只读存储器(Read-Only Memory，ROM)、随机存储器(Random-Access Memory，RAM)、固态硬盘(Solid State Drives，SSD)或光盘等。其中，随机存取记忆体可以包括电阻式随机存取记忆体(Resistance Random Access Memory，ReRAM)和动态随机存取存储器(Dynamic Random Access Memory，DRAM)。
本申请实施例还提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片在终端设备上运行时，用于实现上述终端设备侧的随机接入方法，或，当所述芯片在网络设备上运行时，用于实现上述网络设备侧的随机接入方法。
本申请实施例还提供了一种计算机程序产品或计算机程序，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，终端设备的处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现上述终端设备侧的随机接入方法，或，网络设备的处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现上述网络设备侧的随机接入方法。
应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。
在本申请实施例的描述中，术语“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与被指示、配置与被配置等关系。
在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
另外，本文中描述的步骤编号，仅示例性示出了步骤间的一种可能的执行先后顺序，在一些其它实施例中，上述步骤也可以不按照编号顺序来执行，如两个不同编号的步骤同时执行，或者两个不同编号的步骤按照与图示相反的顺序执行，本申请实施例对此不作限定。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述仅为本申请的示例性实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (45)

  1. 一种随机接入方法，其特征在于，所述方法由终端设备执行，所述方法包括：
    在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
  2. 根据权利要求1所述的方法，其特征在于，
    所述方法适用于非地面通信网络NTN系统；
    或，
    所述方法适用于所述NTN系统和地面通信网络TN系统。
  3. 根据权利要求1或2所述的方法，其特征在于，在接收到所述消息3重传指示之后，所述方法还包括：
    发送重传的所述消息3；
    重新启动所述随机接入竞争解决定时器。
  4. 根据权利要求3所述的方法，其特征在于，在所述方法应用于NTN系统的情况下，所述重新启动所述随机接入竞争解决定时器，包括：
    在发送完重传的所述消息3之后，在经过第一时间偏移之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
  5. 根据权利要求4所述的方法，其特征在于，所述第一时间偏移包括如下中的至少一种：
    终端设备-下一代基站往返传输时间UE-gNB RTT、终端设备-演进基站往返传输时间UE-eNB RTT。
  6. 根据权利要求3所述的方法，其特征在于，在所述方法应用于TN系统的情况下，所述重新启动所述随机接入竞争解决定时器，包括：
    在发送完重传的所述消息3之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
  7. 根据权利要求1至6任一所述的方法，其特征在于，在接收到所述消息3重传指示之前，所述方法还包括：
    发送所述消息3；
    启动所述随机接入竞争解决定时器。
  8. 根据权利要求7所述的方法，其特征在于，在所述方法应用于NTN系统的情况下，所述启动所述随机接入竞争解决定时器，包括：
    在发送完所述消息3之后，在经过第二时间偏移之后的第一个时域单元，启动所述随机接入竞争解决定时器。
  9. 根据权利要求8所述的方法，其特征在于，
    所述第二时间偏移与第一时间偏移相同；
    或，
    所述第二时间偏移与所述第一时间偏移不同，所述第一时间偏移是所述终端设备在发送完重传的所述消息3之后，重新启动所述随机接入竞争解决定时器所经历的时间偏移。
  10. 根据权利要求8所述的方法，其特征在于，所述第二时间偏移包括如下中的至少一种：
    UE-gNB RTT、UE-eNB RTT。
  11. 根据权利要求7所述的方法，其特征在于，在所述方法应用于TN系统的情况下，所述启动所述随机接入竞争解决定时器，包括：
    在发送完所述消息3之后的第一个时域单元，启动所述随机接入竞争解决定时器。
  12. 根据权利要求4或6或8或11所述的方法，其特征在于，所述时域单元包括如下中的至少一种：
    帧、子帧、时隙和符号。
  13. 根据权利要求1至12任一所述的方法，其特征在于，
    所述消息3重传指示携带在物理下行控制信道PDCCH中。
  14. 根据权利要求13所述的方法，其特征在于，
    所述PDCCH由临时小区-无线网络临时标识TC-RNTI加扰。
  15. 一种随机接入方法，其特征在于，所述方法由网络设备执行，所述方法包括：
    向终端设备发送消息3重传指示；
    其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
  16. 根据权利要求15所述的方法，其特征在于，
    所述方法适用于非地面通信网络NTN系统；
    或，
    所述方法适用于所述NTN系统和地面通信网络TN系统。
  17. 根据权利要求15或16所述的方法，其特征在于，在所述向终端设备发送消息3重传指示之后，所述方法还包括：
    接收重传的所述消息3。
  18. 根据权利要求15至17任一所述的方法，其特征在于，在所述向终端设备发送消息3重传指示之前，所述方法还包括：
    接收所述消息3。
  19. 根据权利要求15至18任一所述的方法，其特征在于，
    所述消息3重传指示携带在物理下行控制信道PDCCH中。
  20. 根据权利要求19所述的方法，其特征在于，
    所述PDCCH由临时小区-无线网络临时标识TC-RNTI加扰。
  21. 一种随机接入装置，其特征在于，所述装置包括：定时器控制模块；
    所述定时器控制模块，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
  22. 根据权利要求21所述的装置，其特征在于，
    所述装置适用于非地面通信网络NTN系统；
    或，
    所述装置适用于所述NTN系统和地面通信网络TN系统。
  23. 根据权利要求21或22所述的装置，其特征在于，所述装置还包括：发送模块；
    所述发送模块，用于发送重传的所述消息3；
    所述定时器控制模块，用于重新启动所述随机接入竞争解决定时器。
  24. 根据权利要求23所述的装置，其特征在于，在所述装置应用于NTN系 统的情况下；
    所述定时器控制模块，用于在发送完重传的所述消息3之后，在经过第一时间偏移之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
  25. 根据权利要求24所述的装置，其特征在于，所述第一时间偏移包括如下中的至少一种：
    终端设备-下一代基站往返传输时间UE-gNB RTT、终端设备-演进基站往返传输时间UE-eNB RTT。
  26. 根据权利要求23所述的装置，其特征在于，在所述装置应用于TN系统的情况下；
    所述定时器控制模块，用于在发送完重传的所述消息3之后的第一个时域单元，重新启动所述随机接入竞争解决定时器。
  27. 根据权利要求21至26任一所述的装置，其特征在于，所述装置还包括：发送模块；
    所述发送模块，用于发送所述消息3；
    所述定时器控制模块，用于启动所述随机接入竞争解决定时器。
  28. 根据权利要求27所述的装置，其特征在于，在所述装置应用于NTN系统的情况下；
    所述定时器控制模块，用于在发送完所述消息3之后，在经过第二时间偏移之后的第一个时域单元，启动所述随机接入竞争解决定时器。
  29. 根据权利要求28所述的装置，其特征在于，
    所述第二时间偏移与第一时间偏移相同；
    或，
    所述第二时间偏移与所述第一时间偏移不同，所述第一时间偏移是所述装置在发送完重传的所述消息3之后，重新启动所述随机接入竞争解决定时器所经历的时间偏移。
  30. 根据权利要求28所述的装置，其特征在于，所述第二时间偏移包括如下中的至少一种：
    UE-gNB RTT、UE-eNB RTT。
  31. 根据权利要求27所述的装置，其特征在于，在所述装置应用于TN系统的情况下；
    所述定时器控制模块，用于在发送完所述消息3之后的第一个时域单元，启动所述随机接入竞争解决定时器。
  32. 根据权利要求24或26或28或31所述的装置，其特征在于，所述时域单元包括如下中的至少一种：
    帧、子帧、时隙和符号。
  33. 根据权利要求21至32任一所述的装置，其特征在于，
    所述消息3重传指示携带在物理下行控制信道PDCCH中。
  34. 根据权利要求33所述的装置，其特征在于，
    所述PDCCH由临时小区-无线网络临时标识TC-RNTI加扰。
  35. 一种随机接入装置，其特征在于，所述装置包括：发送模块；
    所述发送模块，用于向终端设备发送消息3重传指示；
    其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
  36. 根据权利要求35所述的装置，其特征在于，
    所述装置适用于非地面通信网络NTN系统；
    或，
    所述装置适用于所述NTN系统和地面通信网络TN系统。
  37. 根据权利要求35或36所述的装置，其特征在于，所述装置还包括：接收模块；
    所述接收模块，用于在向所述终端设备发送所述消息3重传指示之后，接收重传的所述消息3。
  38. 根据权利要求35至37任一所述的装置，其特征在于，所述装置还包括：接收模块；
    所述接收模块，用于在向所述终端设备发送所述消息3重传指示之前，接收所述消息3。
  39. 根据权利要求35至38任一所述的装置，其特征在于，
    所述消息3重传指示携带在物理下行控制信道PDCCH中。
  40. 根据权利要求39所述的装置，其特征在于，
    所述PDCCH由临时小区-无线网络临时标识TC-RNTI加扰。
  41. 一种终端设备，其特征在于，所述终端设备包括处理器；
    所述处理器，用于在接收到消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器，所述消息3重传指示用于指示对所述消息3进行重传。
  42. 一种网络设备，其特征在于，所述网络设备包括收发器；
    所述收发器，用于向终端设备发送消息3重传指示；
    其中，所述消息3重传指示用于指示对所述消息3进行重传，所述终端设备在接收到所述消息3重传指示的情况下，停止正在运行的随机接入竞争解决定时器。
  43. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序，所述计算机程序用于被处理器执行，以实现如权利要求1至20任一项所述的随机接入方法。
  44. 一种芯片，其特征在于，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片运行时，用于实现如权利要求1至20任一项所述的随机接入方法。
  45. 一种计算机程序产品或计算机程序，其特征在于，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现如权利要求1至20任一项所述的随机接入方法。
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