WO2023066335A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2023066335A1
WO2023066335A1 PCT/CN2022/126406 CN2022126406W WO2023066335A1 WO 2023066335 A1 WO2023066335 A1 WO 2023066335A1 CN 2022126406 W CN2022126406 W CN 2022126406W WO 2023066335 A1 WO2023066335 A1 WO 2023066335A1
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Prior art keywords
message
random access
ssb
terminal device
threshold
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PCT/CN2022/126406
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English (en)
Chinese (zh)
Inventor
王珏
娄崇
顾志方
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华为技术有限公司
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Publication of WO2023066335A1 publication Critical patent/WO2023066335A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the embodiments of the present application relate to the field of wireless communication, and in particular, to a random access method and device.
  • the terminal equipment in the communication scene gradually presents the characteristics of large quantity and multiple forms.
  • the industrial automation scenario there are a large number of monitoring equipment, machines, or sensors in the factory; in the family and life scenarios, there are a large number of mobile phones, tablets, wearable devices, smart home appliances, or vehicle-mounted terminal devices.
  • the random access process is an important process for establishing a wireless link between the terminal device and the network. Therefore, reducing the time delay of the random access process and improving the efficiency of the random access process has become an urgent problem to be solved.
  • the present application provides a random access method and device, which are used to reduce the time delay of the random access process and improve the efficiency of the random access process.
  • the present application provides a method for random access, where the subject of execution of the method is a terminal device.
  • the terminal device judges whether there is a synchronization signal and a physical broadcast channel block SSB with a synchronization reference signal received power SS-RSRP higher than a first threshold, wherein the first threshold is preset by the access network device; the terminal device judges whether the request is satisfied The condition for message 3 repetition; if the condition for requesting message 3 repetition is satisfied, and there is an SSB with the SS-RSRP higher than the first threshold, the terminal device performs non-contention random access; or, if the request is satisfied The condition of message 3 repetition, and there is an SSB with the SS-RSRP higher than the first threshold, the terminal device performs contention-based random access, and performs message 3 repetition during the process of performing the contention-based random access .
  • the contradiction that occurs when the terminal device performs SSB selection and message 3 repetition judgment can be resolved.
  • the network load is high and the delay requirement is high, you can choose to implement CFRA when the above contradictions occur, and reduce the time for terminal equipment to access the access network equipment by avoiding preamble collisions and simplifying the steps of the random access process.
  • Delay when the network load is low, the delay requirement is low, and the random access resources are sufficient, CBRA can be selected when the above contradiction occurs.
  • the satisfying the condition for requesting message 3 repetition specifically includes: the reference signal received power RSRP of the downlink reference signal is lower than a second threshold, where the second threshold is The aforementioned access network devices are preset.
  • the judging whether the condition for requesting message 3 repetition is met specifically includes: if there is no SSB whose SS-RSRP is higher than the first threshold, judging whether the Condition for request message 3 repetition.
  • the terminal device judges whether there is a random access resource supporting message 3 repetition on the active uplink partial bandwidth BWP.
  • the terminal device receives configuration information from the access network device; the terminal device determines the number of repetitions of message 3 corresponding to each SSB in the first SSB set according to the configuration information, Wherein, the first SSB set is part or all of all SSBs that can be detected by the terminal device.
  • the terminal device selects a first SSB from the first SSB set, and sends an The network access device sends a random access preamble corresponding to the first SSB.
  • the terminal device receives a first message from the access network device, where the first message indicates the adjusted number of repetitions of message 3 .
  • the present application provides a method for random access, where the subject of execution of the method is a terminal device.
  • the terminal device receives configuration information from the access network device; the terminal device determines the number of repetitions of message 3 corresponding to each SSB in the first SSB set according to the configuration information; the terminal device repeats according to the message 3 corresponding to each SSB in the first SSB set The number of times determines the first SSB and the number of repetitions of message 3 corresponding to the first SSB; the terminal device sends the preamble corresponding to the first SSB to the access network device on the RO resource corresponding to the first SSB.
  • the terminal device receives a first message from the access network device, where the first message indicates the adjusted number of repetitions of message 3 .
  • the terminal device can choose to report the requested number of repetitions of message 3, and the access network device can also indicate the adjusted number of repetitions of message 3 by sending information, so that the terminal device can use an appropriate number of repetitions Sending message 3 avoids waste of resources while improving the reliability of random access.
  • a communication device including functional modules for implementing the method in the foregoing first aspect, any possible implementation manner of the first aspect, the second aspect, and any possible implementation manner of the second aspect.
  • a communication device including a processor and an interface circuit, and the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or send signals from the processor
  • the processor is used to implement the aforementioned first aspect, any possible implementation of the first aspect, the second aspect, and any possible implementation of the second aspect through a logic circuit or by executing code instructions. method in the implementation.
  • a communication device including a processor and a memory, the processor is coupled to the memory, and the processor is used to control the device to implement the aforementioned first aspect, any possible implementation of the first aspect, and the second aspect, a method in any possible implementation of the second aspect.
  • a computer-readable storage medium stores computer programs or instructions.
  • the computer programs or instructions are executed, any possibility of the aforementioned first aspect and the first aspect can be realized.
  • a computer program product containing instructions is provided. When the instructions are executed, the aforementioned first aspect, any possible implementation of the first aspect, the second aspect, and any possible implementation of the second aspect are realized methods in methods.
  • a computer program includes codes or instructions, and when the codes or instructions are executed, the aforementioned first aspect, any possible implementation of the first aspect, the second aspect, the second A method in any possible implementation of an aspect.
  • a chip system the chip system includes a processor, and may also include a memory, so as to implement the aforementioned first aspect, any possible implementation of the first aspect, the second aspect, and any possible implementation of the second aspect methods in methods.
  • the system-on-a-chip may consist of chips, or may include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of a contention-based four-step random access provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a contention-based two-step random access provided by an embodiment of the present application
  • FIG. 3 is a schematic diagram of a non-contention-based four-step random access provided by an embodiment of the present application
  • FIG. 4 is a schematic diagram of a non-contention-based two-step random access provided by an embodiment of the present application
  • FIG. 5, FIG. 6 and FIG. 7 are schematic flowcharts of the data transmission method provided by the embodiment of the present application.
  • FIG. 8 and FIG. 9 are schematic structural diagrams of a possible communication device provided by an embodiment of the present application.
  • 5G long term evolution
  • 5G fifth generation
  • WiFi future communication system
  • NR new radio
  • the technical solution provided by the embodiment of the present application can be applied to various communication scenarios, for example, it can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (ultra -reliable low-latency communication (URLLC), machine type communication (machine type communication, MTC), large-scale machine type communication (massive machine type communications, mMTC), device-to-device (device-to-device, D2D), outside the vehicle Networking (vehicle to everything, V2X), vehicle to vehicle (vehicle to vehicle, V2V), and Internet of things (Internet of things, IoT), etc.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communication
  • MTC machine type communication
  • mMTC massive machine type communication
  • device-to-device device-to-device, D2D
  • V2X vehicle to everything
  • V2V vehicle to vehicle
  • IoT Internet of things
  • "/" can indicate that the objects associated before and after are in an "or” relationship, for example, A/B can indicate A or B; "and/or” can be used to describe that there are three types of associated objects A relationship, for example, A and/or B, may mean: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B can be singular or plural.
  • words such as “first” and “second” may be used to distinguish technical features with the same or similar functions. The words “first” and “second” do not limit the number and execution order, and the words “first” and “second” do not necessarily mean that they must be different.
  • words such as “exemplary” or “for example” are used to indicate examples, illustrations or illustrations, and embodiments or designs described as “exemplary” or “for example” should not be interpreted as More preferred or more advantageous than other embodiments or design solutions.
  • the use of words such as “exemplary” or “for example” is intended to present related concepts in a specific manner for easy understanding.
  • the terminal device involved in this embodiment of the present application may also be referred to as a terminal, and may be a device with a wireless transceiver function).
  • the terminal device may be a user equipment (user equipment, UE), and the UE includes a handheld device with a wireless communication function, a vehicle device, a wearable device, or a computing device.
  • the UE may be a mobile phone, a tablet computer, or a computer with a wireless transceiver function.
  • Terminal devices can also be virtual reality terminal devices, augmented reality terminal devices, wireless terminals in industrial control, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, and wireless terminals in smart cities , and/or wireless terminals in a smart home, etc.
  • the device used to realize the function of the terminal device may be a terminal device; it may also be a device capable of supporting the terminal device to realize the function, such as a chip system, which may be installed in the terminal device or connected with the terminal device Matching is used.
  • the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
  • the access network device involved in the embodiment of the present application includes a base station (base station, BS), which may be a device deployed in a wireless access network and capable of wireless communication with a terminal device.
  • Base stations may come in various forms, such as macro base stations, micro base stations, relay stations, and access points.
  • the base station involved in the embodiment of the present application may be a base station in the 5G system or a base station in the LTE system, where the base station in the 5G system may also be called a transmission reception point (transmission reception point, TRP) or a next-generation node B (generation Node B, gNB or gNodeB).
  • TRP transmission reception point
  • gNB next-generation node B
  • the device for implementing the function of the access network device may be the access network device; it may also be a device capable of supporting the access network device to realize the function, such as a chip system, and the device may be installed on the access network It can be used in network access equipment or matched with access network equipment.
  • the technical solution provided by the embodiment of the present application is described by taking the access network device as an example for realizing the function of the access network device.
  • Random access includes contention based random access (CBRA) and contention free random access (CFRA).
  • CBRA contention based random access
  • CFRA contention free random access
  • Step 1 The terminal device sends a preamble (also called Msg1) to the access network device, and the access network device obtains the preamble ID (RAPID) by detecting the preamble, and estimates the transmission delay.
  • a preamble also called Msg1
  • RAPID preamble ID
  • Step 2 The access network device replies RAR (also called Msg2) to the terminal device, which carries the timing advance (timing advance, TA) corresponding to the transmission delay estimated in step 1, which is the message 3 in step 3 (also called The time-frequency domain resource and the temporary cell radio network temporary identity (TC-RNTI) etc. which may be referred to as the transmission configuration of Msg3).
  • RAR also called Msg2
  • TA timing advance
  • TC-RNTI temporary cell radio network temporary identity
  • Step 3 step 4: If multiple terminal devices use the same time-frequency domain resources to send the same preamble in step 1, conflicts and competition will occur, and steps 3 and 4 are used for contention resolution. Specifically, after receiving the RAR corresponding to its own RAPID, the terminal device adjusts the uplink timing according to the TA in it, and sends message 3 on the time-frequency domain resources allocated by the RAR, and the message 3 will carry the identity of the terminal device. Next, the access network device replies a contention resolution message (message 4, also referred to as Msg4) to the terminal device, and if the terminal device receives message 4 corresponding to its own identity, it successfully completes the random access process.
  • Msg4 contention resolution message
  • the terminal device meets the CFRA conditions, it will use dedicated random access resources and preamble. At this time, there is no contention conflict, so it is not necessary to perform steps 3 and 4 in CBRA.
  • whether the terminal device performs CBRA or CFRA depends on triggering a random access event and random access resources configured by the access network device for the terminal device.
  • Events that trigger a CBRA can include:
  • the terminal device initially accesses the cell, from the radio resource control (radio resource control, RRC) idle state to the RRC connection state
  • the terminal device is in the RRC connection state, and uplink data arrives, but the uplink is not synchronized or there is no available physical uplink shared channel (PUSCH) resource transmission scheduling request (scheduling request, SR)
  • PUSCH physical uplink shared channel
  • SR resource transmission scheduling request
  • the terminal device changes from the RRC inactive state to the RRC connection state
  • the terminal device is in the RRC connection state, and the downlink data arrives, but the uplink is not synchronized
  • SpCell refers to the primary cell (PCell) in the primary cell group (master cell group, MCG) and the primary secondary cell (PSCell) in the secondary cell group (secondary cell group, SCG); when there is no In dual connectivity, the SpCell is the primary cell.
  • Random access may include four-step random access and two-step random access.
  • the terminal device sends a preamble (preamble) to the access network device through a physical random access channel (PRACH), that is, sends a message 1 to the access network device; the access network device After receiving the access preamble, a random access response (random access response, RAR) is sent to the terminal device, that is, the access network device sends a message 2 to the terminal device, and the RAR can indicate the resource location of the PUSCH; PUSCH resource location, send message 3 to the access network device through PUSCH; after receiving message 3, the access network device can send message 4 to the terminal device.
  • PRACH physical random access channel
  • message 3 may include an RRC setup request (RRCSetupResuest) message or an RRC resume request (RRCResumeResuest) message.
  • message 4 may include one or more of the following information: RRC setup (RRCSetup) message, RRC recovery (RRCResume) message, PUSCH acknowledgment (acknowledgment)/negative acknowledgment (negative acknowledgment) in message 3, NACK), and power control commands, etc.
  • RRC setup RRCSetup
  • RRCResume RRC recovery
  • PUSCH acknowledgment acknowledgenowledgment
  • negative acknowledgment negative acknowledgment
  • NACK negative acknowledgment
  • power control commands etc.
  • four-step random access may also be called: “4-step RACH” or "four-step RACH”, and the embodiment of the present application does not limit the name.
  • the terminal device sends an access preamble to the access network device through the PRACH, and sends uplink data to the access network device through the PUSCH, that is, the terminal device sends a message A to the access network device; After receiving message A, the access network device sends message B to the terminal device.
  • the message A may include an RRC setup request (RRCSetupResuest) message or an RRC resume request (RRCResumeResuest) message.
  • message B may include one or more of the following information: RRC Setup (RRCSetup) message, RRC Resume (RRCResume) message, ACK/NACK of PUSCH in message A, and power control command.
  • "two-step random access” may also be called “2-step RACH” or "two-step RACH", and the embodiment of the present application does not limit the name.
  • the terminal device only sends the preamble in Msg1, while in the two-step random access process, the terminal device also sends uplink data in MsgA in addition to the preamble.
  • the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) divides the random access process into the following four types: contention-based four-step random access (hereinafter referred to as 4-step CBRA ), non-contention-based four-step random access (hereinafter referred to as 4-step CFRA), contention-based two-step random access (hereinafter referred to as 2-step CBRA) and non-contention-based two-step random access (hereinafter referred to as called 2-step CFRA).
  • 4-step CBRA contention-based four-step random access
  • 4-step CFRA contention-based two-step random access
  • 2-step CBRA contention-based two-step random access
  • 2-step CFRA non-contention-based two-step random access
  • the terminal device Before sending the preamble, the terminal device needs to perform random access initialization first, and select a carrier (NUL or SUL) for performing random access.
  • NUL or SUL a carrier
  • the terminal device compares the reference signal received power (reference signal received power, RSRP) of the downlink reference signal with the threshold value rsrp configured by the access network device -ThresholdSSB-SUL, if RSRP is higher than rsrp-ThresholdSSB-SUL, the terminal device performs random access on NUL, otherwise performs random access on SUL.
  • RSRP reference signal received power
  • the terminal device needs to select a part of the bandwidth (Bandwidthpart, BWP). Exemplarily, the terminal device checks whether random access resources are available on the currently active uplink BWP, and if not, switches to the BWP indicated by the parameter initialUplinkBWP.
  • the terminal device After selecting the carrier and BWP, the terminal device needs to determine the type of random access (4-step random access or 2-step random access). Exemplarily, if 2-step random access resources and 4-step random access resources are configured on the selected BWP at the same time, and the RSRP of the downlink reference signal is higher than the threshold MsgA-RSRP-Threshold, the terminal device selects 2-step Random access, otherwise select 4-step random access.
  • the terminal device needs to select the downlink transmission beam, and inform the access network device of the selection result through the corresponding PRACH transmission resource (PRACH occasion, RO) and the preamble carried on the RO, so as to realize downlink beam alignment.
  • PRACH occasion, RO PRACH occasion
  • the access network device configures one or more synchronization signals and physical broadcast channel block (synchronization signal and physical broadcast channel block, SSB) for the terminal device to determine whether to execute CFRA, if the terminal device If it is determined that one or more SSBs of this configuration have an SSB whose synchronization signal reference signal received power (SS-RSRP) is higher than the threshold rsrp-ThresholdSSB, then the terminal device will start from the SS-RSRP higher than the threshold rsrp-ThresholdSSB Select one of the SSBs to perform CFRA.
  • SS-RSRP synchronization signal reference signal received power
  • Message 3 repetition is a coverage enhancement technology, which improves the reliability of uplink transmission of users (especially cell edge users) by repeatedly sending message 3 in the random access process, and achieves the purpose of expanding uplink coverage.
  • the terminal device determines whether to request repetition of message 3 from the access network device, and the access network device indicates the number of repetitions of message 3 to the terminal device requesting repetition of message 3 .
  • the terminal device obtains the threshold configured by the access network device from the system message for judging whether to request message 3 repetition, which is recorded as rsrp-ThresholdMsg3Rep in this embodiment of the application, and the name of the parameter is not limited in this embodiment of the application.
  • the terminal device compares the RSRP of the downlink reference signal with rsrp-ThresholdMsg3Rep, if the RSRP of the downlink reference signal is lower than rsrp-ThresholdMsg3Rep, it requests the access network device to perform message 3 repetition, and vice versa is not requested.
  • Terminal devices can group ROs and/or preambles according to parameters configured by access network devices, and terminal devices that request or do not request message 3 repetition will select different groups of ROs and/or preambles for message 1 transmission.
  • the access network device determines whether the terminal device requests message 3 to be repeated according to the preamble sent by the terminal device and/or the RO transmitting the preamble. For a terminal device that requests repetition of message 3, the access network device informs the terminal device of the number of repetitions through the RAR.
  • the access network device will determine the number of repetitions of message 3 according to the channel quality estimated from message 1 sent by the terminal device and indicate it to the terminal device. Once the multi-user interference noise is large, or the preamble collision occurs, the channel estimation error will be large. At this time, the access network device may indicate an inappropriate number of repetitions to the terminal device. If the number of repetitions is too large, it will cause Random access resources are wasted, and if the number of repetitions is too small, transmission failure will easily occur.
  • the present invention provides a random access method, which is used to reduce the time delay of the random access process and improve the efficiency and reliability of the random access process.
  • FIG. 5 is a schematic flowchart of a random access method provided by an embodiment of the present application.
  • This embodiment relates to a specific process of random access performed by an access network device and a terminal device.
  • the executors of this embodiment may be the access network device and the terminal device, or may be modules respectively applied to the access network device and the terminal device, for example, a chip.
  • an access network device and a terminal device are taken as execution bodies as examples for description.
  • the method may include: S501, S502 and S503, wherein S503 may be replaced by S503a.
  • S503 may be replaced by S503a.
  • the embodiment of the present application does not limit the execution sequence of each step, for example, S502 may be executed before S501.
  • the terminal device judges whether a condition for requesting message 3 repetition is satisfied. Exemplarily, if the RSRP of the downlink reference signal is lower than the second threshold preset by the access network device, the condition of requesting message 3 repetition is satisfied; otherwise, if the RSRP of the downlink reference signal is higher than or equal to the preset threshold of the access network device The second threshold is not satisfied.
  • the terminal device determines whether there is an SSB whose SS-RSRP is higher than the first threshold.
  • the first threshold is preset by the access network device.
  • the terminal device may determine whether there is an SSB whose SS-RSRP is higher than the first threshold among one or more SSBs configured by the access network device for the terminal device.
  • the terminal device may also determine whether there is an SSB whose SS-RSRP is higher than the first threshold among all SSBs that can be detected by the terminal device.
  • the terminal device executes CFRA. For example, if the condition of requesting message 3 repetition is met, and there is an SSB whose SS-RSRP is higher than the first threshold among one or more SSBs configured by the access network device for the terminal device, the terminal device executes CFRA.
  • the terminal device selects an SSB from the SSBs whose SS-RSRP is higher than the first threshold, then selects the RO and preamble corresponding to the selected SSB from the random access resources configured by the access network device, and performs CFRA.
  • the random access resources configured by the access network device may be 4-step CFRA resources.
  • the access network device configures 4-step CFRA resources for the terminal device on the BWP selected by the terminal device.
  • the terminal device performs CBRA, and the terminal device does not perform message 3 repetition.
  • the terminal device selects an SSB among all SSBs that the terminal device can detect, and selects a random access resource corresponding to the selected SSB from the group of random access resources corresponding to the repetition of the message 3 ( RO and/or preamble), and use the random access resources to perform CBRA.
  • the terminal device executes CBRA, and the terminal device executes repetition of message 3 .
  • the terminal device selects one SSB among all SSBs that can be detected by the terminal device, and selects a random access resource (RO and/or preamble), and use the random access resources to perform CBRA.
  • a random access resource RO and/or preamble
  • the terminal device executes CFRA.
  • the terminal device selects an SSB from the SSBs whose SS-RSRP is higher than the first threshold, then selects the RO and preamble corresponding to the selected SSB from the 4-step CFRA resources configured by the access network device, and executes CFRA .
  • S503 may be replaced by S503a.
  • the terminal device executes CBRA, and in the process of executing CBRA, executes message 3 repetition.
  • the terminal device selects an SSB among the SSBs whose SS-RSRP is higher than the first threshold, and selects a random access resource corresponding to the selected SSB in the group of random access resources corresponding to the request message 3 repetition ( RO and/or preamble), and use the random access resources to perform CBRA.
  • the terminal device executes CBRA, and the terminal device executes repetition of message 3 .
  • the terminal device selects one SSB among all SSBs that can be detected by the terminal device, and selects a random access resource (RO and/or preamble), and use the random access resources to perform CBRA.
  • a random access resource RO and/or preamble
  • the terminal device performs CBRA, and the terminal device does not perform message 3 repetition.
  • the terminal device selects an SSB among all SSBs that the terminal device can detect, and selects a random access resource corresponding to the selected SSB from the group of random access resources corresponding to the repetition of the message 3 ( RO and/or preamble), and use the random access resources to perform CBRA.
  • the terminal device executes CFRA.
  • the terminal device selects an SSB from the SSBs whose SS-RSRP is higher than the first threshold, then selects the RO and preamble corresponding to the selected SSB from the 4-step CFRA resources configured by the access network device, and executes CFRA .
  • the foregoing embodiments provide a method for random access, which can resolve the contradiction that occurs when the terminal device performs SSB selection and message 3 repetition judgment.
  • the network load is high and the delay requirement is high, you can choose to implement CFRA when the above contradictions occur, and reduce the time for terminal equipment to access the access network equipment by avoiding preamble collisions and simplifying the steps of the random access process.
  • Delay when the network load is low, the delay requirement is low, and the random access resources are sufficient, CBRA can be selected when the above contradiction occurs.
  • FIG. 6 is a schematic flowchart of a random access method provided by an embodiment of the present application.
  • This embodiment relates to a specific process of random access performed by an access network device and a terminal device.
  • the executors of this embodiment may be the access network device and the terminal device, or may be modules respectively applied to the access network device and the terminal device, for example, a chip.
  • an access network device and a terminal device are taken as execution bodies as examples for description.
  • the method may include: S601, S602, S603 and S604.
  • the embodiment of the present application does not limit the execution sequence of each step.
  • the terminal device determines whether there is an SSB whose SS-RSRP is higher than a first threshold.
  • the first threshold is preset by the access network device.
  • the terminal device may determine whether there is an SSB whose SS-RSRP is higher than the first threshold among one or more SSBs configured by the access network device for the terminal device.
  • the terminal device may also determine whether there is an SSB whose SS-RSRP is higher than the first threshold among all SSBs that can be detected by the terminal device.
  • judging whether the condition for requesting message 3 repetition is satisfied specifically includes: if the RSRP of the downlink reference signal is lower than the second threshold preset by the access network device, the condition for requesting message 3 repetition is satisfied; otherwise, it is not satisfied.
  • the terminal device executes CBRA, and in the process of executing CBRA, executes message 3 repetition.
  • the terminal device selects one SSB among all SSBs that can be detected by the terminal device, and selects a random access resource (RO and/or preamble), and use the random access resources to perform CBRA.
  • a random access resource RO and/or preamble
  • the terminal device executes CBRA, and does not execute message 3 repetition during the process of executing CBRA.
  • the terminal device selects an SSB among all SSBs that the terminal device can detect, and selects a random access resource corresponding to the selected SSB from the group of random access resources corresponding to the repetition of the message 3 ( RO and/or preamble), and use the random access resources to perform CBRA.
  • the terminal device executes CFRA.
  • the terminal device selects an SSB from the SSBs whose SS-RSRP is higher than the first threshold, and then selects the RO and preamble corresponding to the SSB from the 4-step CFRA resources configured by the access network device to perform random access.
  • the foregoing embodiments provide a method for random access.
  • the terminal device first performs SSB selection, and then performs the judgment of message 3 repetition.
  • SSB selection if the terminal device judges to execute CFRA, it does not need to perform the judgment of message 3 repetition; when performing SSB selection, if the terminal device judges to execute CBRA, it then executes the judgment of message 3 repetition.
  • CFRA if the terminal device judges to execute CBRA, it then executes the judgment of message 3 repetition.
  • the terminal device's judgment of whether there is an SSB whose SS-RSRP is higher than the first threshold may be replaced by: the terminal device's judgment of whether there is a channel state information reference signal received power (channel A channel state information reference signal (channel state information reference signal, CSI-RS) whose state information reference signal received power (CSI-RSRP) is higher than the third threshold.
  • the third threshold is preset by the access network device.
  • the terminal device may determine whether there is a CSI-RS whose CSI-RSRP is higher than the third threshold among one or more CSI-RSs configured by the access network device for the terminal device.
  • the terminal device may determine whether there is a random access resource supporting coverage enhancement on the active uplink BWP.
  • the first random access procedure is CBRA including message 3 repetition
  • the second random access procedure is CBRA not including message 3 repetition.
  • the random access resources supporting coverage enhancement represent random access resources used to execute the first random access procedure. That is, the random access resources supporting coverage enhancement can also be understood as the random access resources supporting message 3 repetition.
  • the active uplink BWP is switched It is the BWP indicated by the parameter initialUplinkBWP, and executes any one of the embodiments S501 to S503a shown in FIG. 5 , or executes any one of the embodiments S601 to S605 shown in FIG. 6 .
  • FIG. 7 is a schematic flowchart of a random access method provided by an embodiment of the present application.
  • This embodiment relates to a specific process of random access performed by an access network device and a terminal device.
  • the executors of this embodiment may be the access network device and the terminal device, or may be modules respectively applied to the access network device and the terminal device, for example, a chip.
  • an access network device and a terminal device are taken as execution bodies as examples for description.
  • the method may include: S701, S702, S703, S704, and S705, wherein S705 is optional.
  • S705 is optional.
  • the embodiment of the present application does not limit the execution sequence of each step.
  • the terminal device receives configuration information from the access network device.
  • the access network device sends configuration item information to the terminal device.
  • the terminal device determines the number of repetitions of message 3 corresponding to each SSB in the first SSB set according to the configuration information.
  • the first SSB set is part or all of all SSBs that can be detected by the terminal device.
  • the access network device divides the SS-RSRP value range of the SSB into N interval segments, where N is a positive integer.
  • Each interval segment corresponds to a value of the repetition times of message 3.
  • a form of the configuration information is shown in Table 1.
  • Table 1 The relationship between the value range of SS-RSRP and the number of repetitions of message 3
  • the terminal device determines the first SSB and the message 3 repetition times corresponding to the first SSB according to the message 3 repetition times corresponding to each SSB in the first SSB set.
  • the terminal device selects an SSB from the SSBs corresponding to the least number of repetitions of message 3, and determines the number of repetitions corresponding to the SSB.
  • the terminal device selects an SSB from the SSBs whose corresponding message 3 repetition times is less than or equal to a certain threshold, and determines the corresponding repetition times of the SSB, where the threshold may be preset by the access network device.
  • the terminal device selects one of the M SSBs with the highest SS-RSRP, where M is a positive integer, and determines the number of repetitions corresponding to the SSB.
  • the embodiment of the present application does not limit the manner in which the terminal device determines the first SSB.
  • the terminal device sends the preamble corresponding to the first SSB to the access network device on the RO resource corresponding to the first SSB.
  • the access network device receives the preamble from the terminal device, determines that the SSB used by the terminal device is the first SSB according to the preamble and the RO receiving the preamble, and determines the number of repetitions of message 3 corresponding to the first SSB.
  • the terminal device receives the first message from the access network device, and correspondingly, the access network device sends the first message to the terminal device.
  • the first message indicates the adjusted number of repetitions of message 3 .
  • the first message may be carried on the UL grant field of the RAR.
  • the first message includes two bits, as shown in Table 2.
  • the value of the first message meaning of first message 00 Number of repetitions of message 3 that agrees to the request of the terminal device 01
  • the number of repetitions of message 3 requested by the terminal device minus 1 10 Add 1 to the number of repetitions of message 3 requested by the terminal device 11 Disagree with message 3 repeat request from end device
  • the access network device divides the number of repetitions of message 3 into three levels through the configuration information, which are 2, 4, and 8.
  • the first message may also indicate that the number of repetitions of message 3 requested by the terminal device is reduced by 1.
  • the number of repetitions of message 3 reported by the terminal device is 8, and the access network device indicates through the first message that the adjusted number of repetitions of message 3 is the gear of the number of repetitions of message 3 requested by the terminal device minus 1, that is, after adjustment The repetition count of message 3 is 4 times.
  • the above embodiments provide a method for random access.
  • the terminal device can choose to report the number of repetitions of message 3 requested, and the access network device can also indicate the adjusted number of repetitions of message 3 by sending information, so that the terminal device can use an appropriate The number of repetitions to send message 3 avoids waste of resources while improving the reliability of random access.
  • step numbers of the various flow charts described in the embodiment are only an example of the execution flow, and do not constitute a restriction on the sequence of execution of the steps. There is no strict order of execution.
  • steps that must be executed are steps that must be executed, and some steps may be added or deleted on the basis of each flow chart according to actual needs.
  • FIG. 8 to FIG. 9 are schematic structural diagrams of possible communication devices provided by the embodiments of the present application.
  • a communication device 800 includes a processing unit 810 and a transceiver unit 820 .
  • the communication apparatus 800 is used to implement the functions of the first access network device in the method embodiments shown in FIGS. 5 to 7 above, or, the communication apparatus 800 may include an Any function or operation module of the first access network device, the module may be fully or partially implemented by software, hardware, firmware or any combination thereof.
  • the processing unit 810 is used to judge whether the condition for requesting message 3 repetition is met; the processing unit 810 is also used to judge whether there is an SS-RSRP high SSB at the first threshold; if the condition of repeating the request message 3 is satisfied, and there is an SSB with SS-RSRP higher than the first threshold, the transceiver unit 820 is configured to perform CFRA; or, if the condition of repeating the request message 3 is met , and, there is an SSB whose SS-RSRP is higher than the first threshold, the transceiver unit 820 is configured to perform CBRA, and during the process of performing CBRA, perform message 3 repetition.
  • the processing unit 810 is used to judge whether there is an SSB whose SS-RSRP is higher than the first threshold; if there is an SS-RSRP higher than the first threshold For the SSB of the threshold, the processing unit 810 is also used to judge whether the condition for requesting message 3 repetition is met; if the condition for requesting message 3 repetition is met, the transceiver unit 820 is used for executing CBRA, and during the process of executing CBRA, execute message 3 repetition.
  • the transceiver unit 810 is used to receive configuration information from the access network device; the processing unit 810 is used to determine the first SSB according to the configuration information The number of repetitions of message 3 corresponding to each SSB in the set; the processing unit 810 is also used to determine the first SSB and the number of repetitions of message 3 corresponding to the first SSB according to the number of repetitions of message 3 corresponding to each SSB in the first SSB set; the transceiver unit The 820 is further configured to send the preamble corresponding to the first SSB to the access network device on the RO resource corresponding to the first SSB; the transceiver unit 820 is further configured to receive a first message from the access network device, the first message indicating the adjusted Number of repetitions for message 3.
  • processing unit 810 and the transceiver unit 820 can be directly obtained by referring to the related descriptions in the method embodiments shown in FIG. 5 , FIG. 6 or FIG. 7 , and will not be repeated here.
  • FIG. 9 is a schematic structural diagram of another possible communication device provided by an embodiment of the present application.
  • a communication device 900 includes a processor 910 and an interface circuit 920 .
  • the processor 910 and the interface circuit 920 are coupled to each other.
  • the interface circuit 920 may be a transceiver or an input-output interface.
  • the communication device 900 may further include a memory 930 for storing instructions executed by the processor 910 or storing input data required by the processor 910 to execute the instructions or storing data generated after the processor 910 executes the instructions.
  • the processor 910 is used to implement the functions of the processing unit 810
  • the interface circuit 920 is used to implement the functions of the transceiver unit 820 .
  • the processor in the embodiments of the present application can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor can be a microprocessor, or any conventional processor.
  • the processor can be random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable In addition to programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM), registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art middle.
  • An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the ASIC can be located in a network device or a terminal device. Certainly, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a terminal device, or other programmable devices.
  • the computer program or instructions may be stored in or transmitted via a computer-readable storage medium.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server integrating one or more available media.
  • the available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (solid state disk, SSD).

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

Abstract

Les modes de réalisation de la présente demande concernent un procédé et un appareil d'accès aléatoire. Un dispositif terminal exécute les étapes consistant à : déterminer s'il existe un bloc de signaux de synchronisation et de canal physique de diffusion (SSB) ayant une puissance de réception de signaux de référence de synchronisation (SS-RSRP) supérieure à un premier seuil ; déterminer si une condition de répétition d'un message de demande (3) est satisfaite ; si la condition de répétition du message de demande (3) est satisfaite et s'il existe un SSB ayant une SS-RSRP supérieure au premier seuil, exécuter un accès aléatoire sans conflit ; ou exécuter un accès aléatoire basé sur un conflit et exécuter une répétition du message (3) pendant l'exécution de l'accès aléatoire basé sur un conflit. Le présent procédé permet de régler un conflit apparaissant lorsqu'un dispositif terminal exécute une sélection d'un SSB et une détermination de répétition d'un message (3) tout en tenant compte d'un retard temporel et d'une efficacité de ressources d'un accès aléatoire.
PCT/CN2022/126406 2021-10-21 2022-10-20 Procédé et appareil d'accès aléatoire WO2023066335A1 (fr)

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Citations (3)

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