WO2022247721A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2022247721A1
WO2022247721A1 PCT/CN2022/093824 CN2022093824W WO2022247721A1 WO 2022247721 A1 WO2022247721 A1 WO 2022247721A1 CN 2022093824 W CN2022093824 W CN 2022093824W WO 2022247721 A1 WO2022247721 A1 WO 2022247721A1
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Prior art keywords
time difference
signal
random access
network device
time
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PCT/CN2022/093824
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English (en)
Chinese (zh)
Inventor
刘小成
于天航
罗禾佳
王俊
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present application relates to the communication field, and more specifically, to a random access method and device.
  • a terminal device In a wireless communication system, a terminal device needs to establish a connection with a network device, and this process is generally called a random access (RA) process. From the perspective of network equipment, it is necessary to receive the uplink Physical Random Access Channel (PRACH) sequence sent by the terminal equipment in a fixed time window, and analyze it. However, the absence of the PRACH sequence received by the network device will cause excessive delay and jitter between the terminal device and the network device, which is not conducive to the realization of the RA process.
  • PRACH Physical Random Access Channel
  • a cyclic prefix (cyclic prefix, CP) is usually added to the PRACH sequence.
  • CP cyclic prefix
  • the present application provides a method and device for random access, which help terminal equipment quickly and stably complete random access in a cell with a large radius and in a satellite communication scenario.
  • a method for random access including: determining a first time difference T1, where the first time difference T1 is used to indicate the time difference between a time domain position for receiving a first signal from a network device and a first fixed time, the first A fixed time is determined according to the 1-second pulse GNSS 1pps signal of the global navigation satellite system; the communication delay Td is determined according to the first time difference T1; the uplink physical random access channel PRACH preamble is sent to the network device according to the communication delay Td.
  • the first signal includes: a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • determining the communication delay Td according to the first time difference T1 includes: acquiring a pre-configured second time difference Tf and a third time difference Tp, and the second time difference Tf is used to indicate The network device sends the time difference between the starting position of the 0th subframe of the air interface frame and the first fixed time, and the third time difference Tp is used to indicate the time difference between the time domain position where the network device sends the first signal and the first fixed time; according to the first time difference T1, the second time difference Tf and the third time difference Tp determine the communication delay Td.
  • the above method further includes: receiving GNSS 1pps signals.
  • a random access method including: sending a first signal to a terminal device according to a first fixed time, the first fixed time is determined according to a 1-second pulse GNSS 1pps signal of a global navigation satellite system; The preamble sequence of the uplink physical random access channel PRACH of the terminal device.
  • the first signal includes: a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the above method further includes: receiving a GNSS 1pps signal.
  • a device for random access including: a processing unit configured to determine a first time difference T1, and the first time difference T1 is used to indicate the time domain position and the first fixed time point for receiving a first signal from a network device The time difference of time, the first fixed time is determined according to the global navigation satellite system 1 second pulse GNSS 1pps signal; The processing unit is also used to determine the communication time delay Td according to the first time difference T1; The network device sends the preamble sequence of the uplink physical random access channel PRACH.
  • the first signal includes: a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the transceiver unit is specifically configured to: acquire a pre-configured second time difference Tf and a third time difference Tp, and the second time difference Tf is used to instruct the network device to send the air interface frame 0
  • the time difference between the starting position of the subframe and the first fixed time, and the third time difference Tp is used to indicate the time difference between the time domain position where the network device sends the first signal and the first fixed time
  • the processing unit is specifically configured to: according to the first time difference T1 , the second time difference Tf and the third time difference Tp determine the communication delay Td.
  • the transceiver unit is further configured to: receive GNSS 1pps signals.
  • a device for random access including: a transceiver unit, configured to send a first signal to a terminal device according to a first fixed time, and the first fixed time is based on a 1-second pulse GNSS 1pps signal of a global navigation satellite system determined; the transceiving unit is further configured to receive an uplink physical random access channel PRACH preamble from the terminal device.
  • the first signal includes: a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the transceiver unit is further configured to: receive GNSS 1pps signals.
  • a communication device including: a processor, the processor is coupled with a memory, and the memory is used to store programs or instructions, and when the programs or instructions are executed by the processor, the device implements the first or second aspect. Any one of the two aspects and methods in various implementation manners thereof.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory may be separated from the processor.
  • a communication system including a terminal device and a network device.
  • the terminal device is configured to implement the method in each implementation manner in the above first aspect
  • the network device is configured to implement the method in each implementation manner in the above second aspect.
  • the communication system further includes other devices that interact with the communication device in the solutions provided by the embodiments of the present application.
  • a computer program product includes: computer program code, when the computer program code is run on a computer, it causes the computer to execute the methods in the above aspects.
  • a computer-readable medium stores program codes, and when the computer program codes are run on a computer, the computer is made to execute the methods in the above aspects.
  • a ninth aspect provides a chip system, including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device installed with the chip system executes the above-mentioned Any aspect from the first aspect to the fifth aspect and a method in a possible implementation thereof.
  • the chip system may include an input chip or interface for sending information or data, and an output chip or interface for receiving information or data.
  • FIG. 1 is a schematic diagram of a communication system 100 suitable for use in the present application.
  • FIG. 2 is a schematic diagram of an example of a network architecture applicable to this application.
  • Fig. 3 is a schematic diagram of an example of a network device communicating with a terminal device through a beamforming technology.
  • Fig. 4 is an example flow chart of contention random access in LTE system and 5G system.
  • Fig. 5 is a schematic diagram showing an example of leader sequence classification.
  • Fig. 6 is a schematic diagram of an example of the time domain position of the uplink physical random access channel PRACH.
  • Fig. 7 is a schematic diagram of an example of the frequency domain position of the uplink physical random access channel PRACH.
  • Fig. 8 is a schematic flow chart of an example of PRACH cell planning in the prior art.
  • FIG. 9 is a schematic diagram of an example of PRACH signal transmission and reception in the prior art.
  • Fig. 10 is a schematic flowchart of an example of the random access method of the present application.
  • Figure 11 is a schematic diagram of a GNSS 1pps signal applicable to this application.
  • Fig. 12 is a schematic flowchart of another example of the random access method of the present application.
  • FIG. 13 is a schematic diagram of an example of an air interface sequence applicable to the present application.
  • FIG. 14 is a schematic diagram of an example of PRACH signal transmission and reception in the present application.
  • Fig. 15 is a schematic structural diagram of an example of a random access device of the present application.
  • Fig. 16 is a schematic structural diagram of another example of a random access device of the present application.
  • FIG. 1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application.
  • the communication system 100 may include a network device 101 and a terminal device 102 , and optionally, may also include a core network device 103 .
  • the network device 101 can communicate with the core network device 103 ; the terminal device 102 can communicate with the network device 101 .
  • the terminal equipment in the embodiment of the present application may refer to user equipment, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device .
  • the terminal in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, an industrial Wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety Wireless terminals in smart cities, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop ( wireless local loop (WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, 5G network A terminal or
  • wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories.
  • Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the terminal device may also be a terminal device in an Internet of Things (internet of things, IoT) system.
  • IoT Internet of things
  • Its main technical feature is to connect objects to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and object interconnection.
  • the present application does not limit the specific form of the terminal device.
  • the terminal device may be a device for realizing the function of the terminal device, or may be a device capable of supporting the terminal device to realize the function, such as a chip system, and the device may be installed in the terminal.
  • the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
  • the network device in this embodiment of the present application may be any device with a wireless transceiver function.
  • the equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller, BSC) , base transceiver station (base transceiver station, BTS), home base station (for example, home evolved nodeB, or home node B, HNB), base band unit (base band unit, BBU), wireless fidelity (wireless fidelity, WIFI) system Access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as, NR, a gNB in the system, or, a transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of a base station in
  • a gNB may include a centralized unit (CU) and a DU.
  • CU centralized unit
  • DU centralized unit
  • the gNB may also include an active antenna unit (active antenna unit, AAU for short).
  • the CU implements some functions of the gNB, and the DU implements some functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and realizing the functions of radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer.
  • the DU is responsible for processing physical layer protocols and real-time services, realizing the functions of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical (physical, PHY) layer.
  • the AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas.
  • the network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network devices in an access network (radio access network, RAN), and the CU can also be divided into network devices in a core network (core network, CN), which is not limited in this application.
  • the network device may be a device for realizing the function of the network device, or may be a device capable of supporting the network device to realize the function, such as a chip system, and the device may be installed in the network device.
  • the core network device may be a session management function (session management function, SMF) network element, an access and mobility management function (access and mobility management function, AMF) network element or a user plane function (user plane function) , UPF) network element, which is not limited in this application.
  • SMF session management function
  • AMF access and mobility management function
  • UPF user plane function
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunications system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • 5G fifth generation
  • V2X can include vehicle to Internet (vehicle to network, V2N), vehicle to vehicle (vehicle to vehicle, V2V), vehicle to infrastructure (vehicle to infrastructure, V2I), vehicle to pedestrian (vehicle to pedestrian, V2P
  • this application can be applied to independently deployed 5G or LTE systems, and can also be applied to non-independently deployed 5G or LTE systems, such as the application scenario of integrated satellite communication and 5G network shown in FIG. 2 .
  • the ground mobile terminal UE accesses the network through the 5G new air interface, and the 5G base station is deployed on the satellite and connected to the core network on the ground through a wireless link.
  • the 5G base station is deployed on the satellite and connected to the core network on the ground through a wireless link.
  • the terminal device may be a mobile device supporting 5G new air interface, such as a mobile phone, a tablet computer and other mobile devices, and the specific form may refer to the example in the above-mentioned FIG. 1 .
  • the ground station is responsible for forwarding signaling and service data between the satellite base station and the 5G core network.
  • the wireless link between the terminal equipment and the base station is the 5G new air interface
  • the interface between the 5G base station and the base station is the Xn interface, which is mainly used for signaling interaction such as handover
  • the interface between the 5G base station and the 5G core network is the NG interface, mainly Interact signaling such as NAS of the core network and user service data.
  • a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application.
  • the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in a terminal device or a network device that can call a program and execute the program.
  • various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques.
  • article of manufacture covers a computer program accessible from any computer readable device, carrier or media.
  • computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or tapes, etc.), optical disks (e.g., compact discs (compact discs, CDs), digital versatile discs (digital versatile discs, DVDs), etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), card, stick or key drive, etc.).
  • magnetic storage devices e.g., hard disks, floppy disks, or tapes, etc.
  • optical disks e.g., compact discs (compact discs, CDs), digital versatile discs (digital versatile discs, DVDs), etc.
  • smart cards and flash memory devices for example, erasable programmable read-only
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.
  • CMC Cellular mobile communication
  • Cellular mobile communication adopts cellular wireless networking mode, and connects terminal devices and network devices through wireless channels, so that users can communicate with each other during activities. Its main feature is the mobility of terminal equipment, and it has the functions of handover and automatic roaming across local networks.
  • Cellular mobile communication services refer to voice, data, video and image services provided through a cellular mobile communication network composed of base station subsystems and mobile switching subsystems.
  • NR New Radio, new air interface
  • 3GPP 3rd Generation Partnership Project, the third generation cooperation project
  • LTE Long Term Evolution
  • the satellite communication system consists of three parts: the satellite terminal, the ground terminal, and the user terminal.
  • the satellite terminal played the role of a relay station in the air, that is, it amplified the electromagnetic wave sent by the ground station and then sent it back to another ground station.
  • the satellite body includes two major subsystems: on-board equipment and satellite parent body.
  • the ground station is the interface between the satellite system and the ground public network. Ground users can also enter and exit the satellite system through the ground station to form a link.
  • the ground station also includes the ground satellite control center, and its tracking, telemetry and command stations.
  • the client end refers to various user terminal devices.
  • satellite communications tend to adopt cellular technology, for example, moving base stations (BS) to satellites.
  • BS moving base stations
  • beamforming massive multiple-input multiple-output (MIMO), and full-dimensional MIMO (full-dimension MIMO, FD-MIMO) are discussed in 5G systems.
  • array antenna digital beamforming (digital beamforming), analog beamforming (analog beamforming) and other antenna technologies.
  • Network devices in the 5G system can interact with user equipment through beamforming technology.
  • a network device can usually form multiple downlink (down link, DL) transmission beams (transmit beam, Tx beam), and send downlink signals to terminal devices within the coverage of the beam on one or more DL Tx beams.
  • the terminal device can receive through a receive beam (receive beam, Rx beam) or an omnidirectional antenna to obtain a larger array gain.
  • Rx beam receive beam
  • omnidirectional antenna omnidirectional antenna
  • Fig. 3 shows a schematic diagram of a network device communicating with a terminal device through a beamforming technology.
  • the network device 101 can use beamforming technology, such as digital beamforming or analog beamforming, to form multiple transmission beams or receiving beams.
  • the angles covered by each beam can be the same or different. Beams with different coverage angles There may be overlapping parts, for example, the network device 101 may use a beam with a wider coverage angle to send control information, and use a beam with a narrower coverage angle to send data information.
  • the user equipment 102 may receive information sent by the network device within the coverage of one or more beams or beam sets or beam groups.
  • the terminal device In cellular communication, the terminal device needs to first realize the time synchronization with the network device. In the case of synchronization, according to the agreement agreed in advance, the network device and the terminal device can analyze the specific content contained in the signal. The first thing the terminal equipment needs to detect is the master synchronization signal. Taking NR as an example, in the synchronization process, the network device first sends a synchronization signal block (Synchronization Signal Block, SSB) beam to the terminal device, and the terminal device scans with a wide beam. After both UE and BS scan once, confirm the narrow beam range of the network device. and wide beams for end devices.
  • SSB Synchronization Signal Block
  • the repetition period of SSB is 5ms, and each period contains one SSB. Therefore, the terminal device can acquire the 5ms timing of the cell by capturing the primary synchronization signal (primary synchronization signal, PSS).
  • PSS primary synchronization signal
  • FIG. 4 shows a flow chart of contention random access in an LTE system and a 5G system.
  • the competitive random access of the LTE system and the 5G system is used for: (1) initial terminal access; (2) radio resource control (radio resource control, RRC) connection re-establishment and handover; (3) RRC connection state in an asynchronous state (4) Arrival of uplink data in RRC connection state; (5) Positioning in RRC connection state.
  • RRC radio resource control
  • the 5G system also introduces system message requests, inactive terminals to restore connections, etc.
  • the competitive random access process is shown in Figure 2, which is mainly divided into four steps:
  • Message 1 The UE selects a random access preamble Preamble and a physical random access channel (physical random access channel, PRACH) resource, and sends the selected random access preamble Preamble to the base station on the selected PRACH resource (ie Msg1).
  • a random access preamble Preamble and a physical random access channel (physical random access channel, PRACH) resource The UE selects a random access preamble Preamble and a physical random access channel (physical random access channel, PRACH) resource, and sends the selected random access preamble Preamble to the base station on the selected PRACH resource (ie Msg1).
  • PRACH physical random access channel
  • Message 2 The base station receives the random access request Msg1, and sends a random access response (random access response, RAR, Msg2) to the UE.
  • the random access response includes the uplink timing advance and the uplink resources allocated for Msg3 UL grant, temporary cell radio network temporary identifier (temporary C-RNTI) assigned by the network side, etc.
  • the physical downlink control channel (PDCCH) carrying the Msg2 scheduling message is scrambled with a random access-radio network temporary identifier (RA-RNTI), Msg2 also carries the Preamble ID, and the UE passes RA-RNTI and Preamble ID determine that the Msg2 corresponds to the Msg1 sent by it.
  • RA-RNTI random access-radio network temporary identifier
  • Msg3 Message 3
  • the UE sends a scheduled transmission (Msg3) on the UL grant specified by Msg2.
  • the Msg3 message contains layer 2/layer 3 (L2/L3) random access information.
  • the content of the uplink transmission of the access reason Msg3 is different, for example, for initial access, Msg3 transmits an RRC connection establishment request.
  • Msg4 Message 4
  • the base station sends a contention resolution message (contention resolution, Msg4) to the UE, and the UE can judge whether the random access is successful according to the Msg4.
  • Msg4 contention resolution message
  • the temporary C-RNTI is automatically converted into the unique UE identifier C-RNTI of the UE in the cell.
  • the network device after receiving the message 1 sent by the terminal device, the network device must first demodulate the PRACH sequence before synchronizing with the terminal device. Therefore, the PRACH preamble sequence needs to have strong demodulation performance.
  • a PRACH sequence consists of a cyclic prefix (cyclic prefix, CP), a preamble sequence (Preamble) and a guard interval. More specifically, in the time domain, a PRACH sequence includes a time length TCP of a cyclic prefix, a time length TSEQ of a preamble sequence, and a guard time TGT. Multiple subcarriers are used in the frequency domain, for the long format preamble, 839 subcarriers are used; for the short format preamble, 139 subcarriers are used.
  • the PRACH preamble sequence will be described in detail below by taking the preamble sequence ZC (Zadoff-Chu) as an example.
  • the leader of the leader sequence ZC the leader is generated by cyclic shifting the ZC root sequence.
  • the logical index of the ZC root sequence is determined by system parameters. For the long-form preamble, the value ranges from 0 to 837; for the short-form preamble, the value ranges from 0 to 137.
  • the logical index of the ZC root sequence is cyclically continuous, namely:
  • the next index of logical index 837 of the long form leader is 0;
  • the next index of logical index 137 of the short form leader is 0;
  • the number of bits for cyclic shift (cyclic shift value used for random access preamble generation, Ncs) is determined by gNodeB according to the cell type and cell radius.
  • each cell can be configured with 64 preambles, if the number of sequences generated by the cyclic shift of the ZC root sequence is less than 64, the cyclic shift of the next ZC root sequence in the logical order continues to generate preambles until the number of preambles reaches 64 .
  • the logical index and cyclic shift of the ZC sequence are transmitted in cells.
  • the PRACH configuration information element is carried by the SIB1 message; for the NSA networking scenario, the PRACH configuration information element is carried by the configuration message.
  • the 64 preambles of the cell are divided into random preambles and dedicated preambles, as shown in FIG. 5 .
  • the proportion of the random preamble sequence to the random preamble sequence and the dedicated preamble sequence can be configured through parameters, and the number of random sign-ins is related to the random access scenario, and can also be configured and issued through parameters.
  • Fig. 6 shows an example of the time domain position of the PRACH.
  • the position of the PRACH in the time domain refers to the frame number and the slot number of the preamble that the terminal device sends, and is determined through the PRACH configuration index.
  • the PRACH configuration index used by the terminal device is determined by the parameters:
  • the PRACH configuration index used by the terminal device is the configured value of this parameter.
  • the PRACH configuration index used by the terminal device is automatically generated by the terminal device, and is related to the system frequency point, duplex mode, uplink and downlink subframe ratio, PUSCH SCS and cell radius.
  • the terminal device can search the corresponding table in the protocol according to the PRACH configuration index, and obtain its preamble format, frame number, subframe number, and symbol of the system where it is located.
  • Fig. 7 shows an example of the frequency domain position of the PRACH.
  • the starting position of the PRACH frequency domain is also determined by system parameters. As shown in FIG. 7 , assuming that the value of the parameter is X, the starting position of the PRACH in the frequency domain is the Xth RB in the initial BWP. When the value is 65535, the PRACH is in the low frequency band of the initial BWP. When Long PUCCH is configured in the initial BWP bandwidth, PRACH is next to Long PUCCH; when Long PUCCH is not configured in the initial BWP bandwidth, PRACH is next to Common PUCCH.
  • the PRACH occupies multiple PRBs in the frequency domain, and the number of PRBs is related to the Preamble length, PRACH subcarrier spacing, and PUSCH subcarrier spacing.
  • the two cell radii of network device 1 and network device 2 are both 0.9KM, the preamble format is 0, the default cell radius is 10KM, and the root sequences of the two cells are 0 and 2 respectively.
  • Step 1 Calculate Ncs according to Formula 1, and send it to the terminal device through the Ncs configuration format index.
  • the Ncs value of the PRACH of the cell can be calculated:
  • Step 2 According to the protocol table of 3GPP, look up the Ncs value in the table.
  • the Ncs value is greater than the Ncs value calculated in step 1.
  • the Ncs value calculated in step 1 is greater than 77.29
  • query the Ncs configuration format table the value is between 76 and 93, take the value 93, and send the corresponding Ncs configuration format index to the UE through the SIB message.
  • Step 3 Calculate the number of leading sequences that a root sequence can produce using the Ncs according to formula (2):
  • the terminal device After receiving the message, the terminal device can look up the table according to the Ncs configuration format index to obtain the Ncs value of 93. Therefore, for the cell of network device 1, the number of PRACH preamble sequences in the cell can be calculated as:
  • Step 4 Calculate the number of roots needed by a community according to formula (3):
  • the number of roots required for the cell can be calculated as:
  • the terminal device can use the following root sequence to access the cell of the network device 1: 1, 2, 3, 4, 5, 6, 7, 8. If, within the overlapping range of two cells, the terminal device selects the root sequence 2 to generate a preamble sequence and initiates random access to the cell of network device 1, after receiving the preamble sequence, network device 1 checks that it belongs to a legal root sequence, and sends The terminal device sends a response RAR. At this time, since the UE is in the coverage area of the cell of the network device 2, the network device 2 can also receive the preamble sequence sent by the UE, check that the root sequence 2 is also legal in the cell of the network device 2, and respond RAR to the UE as well. At this time, false alarms or collisions will occur when the cell receives and detects the access request.
  • the UE uses the physical cell identifier (PCI) of the network device 1 to receive the RAR, and can only receive the RAR sent by the network device 1, but cannot receive the RAR responded by the network device 2, so the RAR sent by the network device 2 will cause damage to the RAR.
  • PCI physical cell identifier
  • the UE's downlink reception generates interference, which reduces the signal to interference plus noise ratio (SINR) of the cell of network device 1, resulting in incomplete received signals, resulting in a large delay between the terminal device and the network device .
  • SINR signal to interference plus noise ratio
  • the bandwidth of the physical downlink shared channel (PDSCH) of the cell of the network device 2 is wasted.
  • the network equipment receives the PRACH signal in a fixed time window. If the UE is too far away from the base station and the Preamble series falls outside the window, it will fail to resolve. Therefore, relying on the leading CP to handle UE delay, the cell radius that can be reached can reach tens of kilometers, which is already the limit. As shown in Figure 9, the signal b received by the network device cannot receive the desired signal at all. In some large cell scenarios, such as satellite communication using cellular technology, the existing technology must be improved.
  • the present application proposes a method and device for random access, which help terminal equipment to quickly and stably complete random access in a cell with a large radius and in a satellite communication scenario.
  • Fig. 10 shows a schematic flowchart of an example of the random access method of the present application.
  • the terminal device 102 determines a first time difference T1.
  • the first time difference T1 is used to indicate the time difference between the time domain position of receiving the first signal from the network device and the first fixed time, and the first fixed time is determined according to the 1-second pulse GNSS 1pps signal of the global navigation satellite system.
  • the first signal may be a signal with a fixed position in the sending time domain, including but not limited to a primary synchronization signal (primary synchronization signal, PSS) or a physical broadcast channel (physical broadcast channel, PBCH).
  • PSS primary synchronization signal
  • PBCH physical broadcast channel
  • the terminal device 102 can receive the GNSS 1pps signal, align the rising edge of the 1-second signal of the terminal device with the rising edge of the GNSS 1pps signal, and the network device 101 can receive the GNSS 1pps signal, and align the rising edge of the 1-second signal of the network device with the rising edge of the GNSS 1pps signal
  • the rising edges of the GNSS 1pps signal are aligned, so that the terminal device 102 and the network device 101 can define the same first fixed time, for example, 10ms, 1ms, 0.125ms and so on.
  • the GNSS 1pps signal is a square wave signal with a frequency of 1Hz. Its characteristic is that no matter where the GNSS module is located, the output 1pps pulse edges are strictly aligned, that is, the GNSS module output in each geographic location The 1pps pulse signals are all synchronous.
  • the first time difference T1 is a time difference of 10 ms between the time domain position at which the terminal device 102 receives the first signal from the network device.
  • the terminal device 102 determines the communication delay Td according to the first time difference T1.
  • the communication delay Td may be used to indicate the communication delay between the terminal device 102 and the network device 101 .
  • the terminal device 102 sends an uplink physical random access channel PRACH preamble to the network device 101 according to the communication delay Td.
  • the terminal device 102 may send the uplink physical random access channel PRACH preamble sequence to the network device 101 in advance of the communication delay Td. In this way, it can be ensured that the network device receives the PRACH preamble at the fixed detection serial port, thereby completing random access for the terminal device 102 .
  • Fig. 12 shows a schematic flowchart of another example of the random access method of the present application.
  • the network device 101 and the terminal device 102 respectively receive the 1-second GNSS 1pps signal of the global navigation satellite system.
  • the terminal device 102 and the network device 101 can perform step S1020 to determine the first fixed time according to the GNSS 1pps signal.
  • the terminal device 102 can receive the GNSS 1pps signal, align the rising edge of the 1-second signal of the terminal device with the rising edge of the GNSS 1pps signal, and the network device 101 can receive the GNSS 1pps signal, and align the rising edge of the 1-second signal of the network device with the rising edge of the GNSS 1pps signal
  • the rising edges of the GNSS 1pps signal are aligned, so that the terminal device 102 and the network device 101 can define the same first fixed time, for example, 10ms, 1ms, 0.125ms and so on.
  • the network device 101 may execute step S1030 to send the first signal according to the first fixed time.
  • the first signal may be a signal with a fixed position in the transmission time domain, including but not limited to a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the time difference between the starting position of the 0th subframe of the air interface frame sent by the network device 101 and 10 ms is preconfigured as the second time difference Tf, and the time difference between the time domain position of the network device sending the first signal and 10 ms is the third time difference Tp.
  • the terminal device 102 determines a first time difference T1.
  • the terminal device may receive the above-mentioned first signal, and determine the first time difference T1 according to the time difference between the time domain position where the first signal is received and the time difference of 10 ms.
  • the terminal device 102 acquires the preconfigured second time difference Tf and third time difference Tp.
  • the terminal device 102 determines the communication delay Td.
  • the terminal device 102 may send the uplink physical random access channel PRACH preamble sequence to the network device 101 according to the communication delay Td. In this way, as shown in FIG. 14 , it can be ensured that the network device receives the PRACH preamble at the fixed detection serial port, preventing the network device 101 from failing to detect the PRACH preamble in a fixed time window, thereby completing random access for the terminal device 102 .
  • FIG. 15 is a schematic diagram of an apparatus 1100 for random access provided in an embodiment of the present application.
  • the apparatus 1100 may be a terminal device (for example, the terminal device 102 ), or may be a chip or a circuit, such as a chip or a circuit that may be provided in the terminal device.
  • the apparatus 1100 may include a processing unit 1110 (ie, an example of a processing unit), and optionally, may also include a storage unit 1120 .
  • the storage unit 1120 is used for storing instructions.
  • the processing unit 1110 is configured to execute the instructions stored in the storage unit 1120, so that the apparatus 1100 implements the steps performed by the terminal device (for example, the terminal device 102) in the above method.
  • the device 1100 may further include an input port 1130 (ie, an example of a communication unit) and an output port 1140 (ie, another example of a communication unit).
  • the processing unit 1110 , the storage unit 1120 , the input port 1130 and the output port 1140 can communicate with each other and transmit control and/or data signals through internal connection paths.
  • the storage unit 1120 is used to store a computer program, and the processing unit 1110 can be used to call and run the computer program from the storage unit 1120 to complete the steps of the terminal device in the above method.
  • the storage unit 1120 may be integrated in the processing unit 1110 , or may be set separately from the processing unit 1110 .
  • the input port 1130 may be a receiver
  • the output port 1140 may be a transmitter
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the input port 1130 is an input interface
  • the output port 1140 is an output interface
  • the functions of the input port 1130 and the output port 1140 may be realized by a transceiver circuit or a dedicated transceiver chip.
  • the processing unit 1110 may be realized by a dedicated processing chip, a processing circuit, a processing unit, or a general-purpose chip.
  • the measurement configuration device for example, the terminal device 102
  • a general-purpose computer to implement the measurement configuration device (for example, the terminal device 102 ) provided in the embodiment of the present application.
  • the program codes that are about to realize the functions of the processing unit 1110, the input port 1130 and the output port 1140 are stored in the storage unit 1120, and the general processing unit realizes the functions of the processing unit 1110, the input port 1130 and the output port 1140 by executing the codes in the storage unit 1120 .
  • the processing unit 1110 is configured to determine a first time difference T1, where the first time difference T1 is used to indicate a time difference between a time domain position at which the first signal from the network device is received and a first fixed time, and the first fixed time It is determined according to the 1 second pulse GNSS 1pps signal of the global navigation satellite system.
  • the processing unit 1110 is further configured to determine the communication delay Td according to the first time difference T1.
  • the output port 1140 is configured to send the uplink physical random access channel PRACH preamble to the network device according to the communication delay Td.
  • the apparatus 1100 is configured in or itself is a terminal device (such as the terminal device 102).
  • the foregoing first signal includes a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the input port 1130 is used to obtain the pre-configured second time difference Tf and the third time difference Tp, and the second time difference Tf is used to indicate the time difference between the starting position of the 0th subframe of the network device sending the air interface frame and the first fixed time , the third time difference Tp is used to indicate the time difference between the time domain position where the network device sends the first signal and the first fixed time.
  • the processing unit 1110 is configured to determine the communication delay Td according to the first time difference T1, the second time difference Tf and the third time difference Tp.
  • the input port 1130 is also used to receive GNSS 1pps signals.
  • each module or unit in the device 1100 listed above are only illustrative.
  • the unit may be used to execute various actions or processing procedures performed by the terminal device in the above measurement configuration method.
  • its detailed description is omitted.
  • FIG. 16 is a schematic diagram of an apparatus 1200 for random access provided in an embodiment of the present application.
  • the apparatus 1200 may be a network device (for example, the network device 101 ), or may be a chip or a circuit, such as a chip or a circuit that may be provided in the network device.
  • the apparatus 1200 may include a processing unit 1210 (ie, an example of a processing unit), and optionally, may also include a storage unit 1220 .
  • the storage unit 1220 is used for storing instructions.
  • the processing unit 1210 is configured to execute instructions stored in the storage unit 1220, so that the apparatus 1200 implements the steps performed by the network device (for example, the network device 101 ) in the foregoing method.
  • the device 1200 may further include an input port 1230 (ie, an example of a communication unit) and an output port 1240 (ie, another example of a communication unit).
  • the processing unit 1210 , the storage unit 1220 , the input port 1230 and the output port 1240 can communicate with each other and transmit control and/or data signals through internal connection paths.
  • the storage unit 1220 is used to store a computer program, and the processing unit 1210 can be used to call and run the computer program from the storage unit 1220 to complete the steps of the network device in the above method.
  • the storage unit 1220 may be integrated in the processing unit 1210 , or may be set separately from the processing unit 1210 .
  • the input port 1230 may be a receiver
  • the output port 1240 may be a transmitter
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the input port 1230 is an input interface
  • the output port 1240 is an output interface
  • the functions of the input port 1230 and the output port 1240 may be realized by a transceiver circuit or a dedicated chip for transceiver.
  • the processing unit 1210 may be considered to be implemented by a dedicated processing chip, a processing circuit, a processing unit, or a general-purpose chip.
  • the measurement configuration device for example, the network device 101
  • the program codes that are about to realize the functions of the processing unit 1210, the input port 1230 and the output port 1240 are stored in the storage unit 1220, and the general processing unit realizes the functions of the processing unit 1210, the input port 1230 and the output port 1240 by executing the codes in the storage unit 1220 .
  • the processing unit 1210 is configured to determine the first fixed time according to the 1-second pulse GNSS 1pps signal of the global navigation satellite system.
  • the output port 1240 is used for sending the first signal to the terminal device according to the first fixed time.
  • the input port 1230 is used for receiving the preamble sequence of the uplink physical random access channel PRACH from the terminal equipment.
  • the first signal includes: a primary synchronization signal PSS or a physical broadcast channel PBCH.
  • the input port 1230 is also used to receive GNSS 1pps signals.
  • the functions and actions of the modules or units in the device 1200 listed above are only for illustrative purposes.
  • the unit may be used to perform various actions or processing procedures performed by the network device in the above measuring method.
  • its detailed description is omitted.
  • the embodiment of the present application further provides a random access system, which includes the aforementioned terminal device and network device.
  • the processor may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processor, DSP), dedicated integrated Circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA off-the-shelf programmable gate array
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories.
  • the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM), which acts as external cache memory.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory Access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • serial link DRAM SLDRAM
  • direct memory bus random access memory direct rambus RAM, DR RAM
  • the above-mentioned embodiments may be implemented in whole or in part by software, hardware, firmware or other arbitrary combinations.
  • the above-described embodiments may be implemented in whole or in part in the form of computer program products.
  • the computer program product comprises one or more computer instructions or computer programs.
  • the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as infrared, wireless, microwave, etc.).
  • 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 or a data center that includes one or more sets of available media.
  • the available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media.
  • the semiconductor medium may be a solid state drive.
  • sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente demande concerne un procédé d'accès aléatoire, consistant à : déterminer une première différence temporelle T1, la première différence temporelle T1 étant utilisée pour indiquer une différence temporelle entre la position de domaine temporel d'un premier signal reçu en provenance d'un dispositif de réseau et un premier temps fixe, le premier temps fixe étant déterminé en fonction d'un signal à 1 impulsion par seconde de système mondial de navigation par satellite (1 pps de GNSS) ; déterminer un retard de communication Td en fonction de la première différence temporelle T1 ; et envoyer une séquence de préambule de canal physique à accès aléatoire de liaison montante (PRACH) à un dispositif de réseau en fonction du retard temporel de communication Td. Selon la solution technique de la présente demande, en déterminant le retard de communication avec le dispositif de réseau et en envoyant la séquence de préambule de PRACH en fonction du retard de communication, le dispositif terminal peut achever rapidement et de manière stable un accès aléatoire.
PCT/CN2022/093824 2021-05-26 2022-05-19 Procédé et appareil d'accès aléatoire WO2022247721A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN111565448A (zh) * 2019-02-14 2020-08-21 电信科学技术研究院有限公司 一种进行随机接入的方法及设备
CN111684842A (zh) * 2019-01-10 2020-09-18 联发科技（新加坡）私人有限公司 侧链同步信号块设计
CN112788777A (zh) * 2019-11-07 2021-05-11 华为技术有限公司 适用于卫星网络的随机接入前导配置方法及装置
WO2021089314A1 (fr) * 2019-11-07 2021-05-14 Nokia Technologies Oy Extension de portée d'avance de synchronisation dans une réponse d'accès aléatoire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111684842A (zh) * 2019-01-10 2020-09-18 联发科技（新加坡）私人有限公司 侧链同步信号块设计
CN111565448A (zh) * 2019-02-14 2020-08-21 电信科学技术研究院有限公司 一种进行随机接入的方法及设备
CN112788777A (zh) * 2019-11-07 2021-05-11 华为技术有限公司 适用于卫星网络的随机接入前导配置方法及装置
WO2021089314A1 (fr) * 2019-11-07 2021-05-14 Nokia Technologies Oy Extension de portée d'avance de synchronisation dans une réponse d'accès aléatoire

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