Communication method and communication device

Abstract

Disclosed in an embodiment of the present application are a communication method and a communication device, the method comprising: a terminal device determining, based on a first parameter, a maximum number M of repeated reception times of a synchronization signal block (SSB), M being an integer greater than 1, the first parameter being one or more of a reference signal received power (RSRP), a reference signal received quality (RSRQ) or a received signal strength indicator (RSSI); and the terminal equipment receives N SSBs from the network equipment based on the maximum SSB repeated receiving times M, the N SSBs are located in the same SSB period, and N is an integer greater than 0 and less than or equal to M. Based on the method described by the invention, the time delay of random access of the terminal equipment can be reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and a communication device. Background Art

[0002] Before the terminal device initiates the random access process, the synchronization signal block (synchronization signal / physical broadcast channel block, SSB) can be used to confirm the time and frequency position of the system information block (system information block, SIB) for the terminal device. The terminal device can obtain the cell information by parsing the SIB, thereby initiating random access. SSB is usually sent periodically, once a period, and in order to improve the coverage, it is usually sent in a wide beam.

[0003] However, in the network edge area, due to limited link budget, the terminal device may not be able to successfully receive and read the SSB when the transmission performance is poor, thereby affecting the random access performance of the terminal device and increasing the random access delay of the terminal device. Summary of the invention

[0004] The embodiments of the present application provide a communication method and a communication device, which are conducive to reducing the delay of random access of terminal devices.

[0005] In the first aspect, an embodiment of the present application provides a communication method, which includes: a terminal device determines a maximum number of repeated reception times M of a synchronization signal block SSB based on a first parameter, where M is an integer greater than 1, and the first parameter is one or more of a reference signal received power RSRP, a reference signal received quality RSRQ, or a received signal strength indication RSSI; the terminal device receives N SSBs from a network device based on the maximum number of repeated reception times M of SSB, where the N SSBs are in the same SSB period, and N is an integer greater than 0 and less than or equal to M.

[0006] Because the terminal device obtains the cell information through the SIB before random access, and the SSB carries information indicating the search space where the control resource set CORESET of the SIB is located. Based on the method described in the first aspect, the terminal device receives a maximum of M SSBs in one SSB cycle, and the terminal device merges and parses the received SSBs. The more SSBs received, the more conducive it is to improve the probability of successfully parsing the SSB. Improving the probability of successfully parsing the SSB is conducive to the terminal device being able to determine the SIB more quickly and obtain the cell information, thereby reducing the delay of random access of the terminal device.

[0007] In a possible implementation, at least one SSB among N SSBs carries the number of SSB repetitions S within the same SSB period, where S is an integer greater than 1.

[0008] In one possible implementation, the MIB included in at least one SSB among N SSBs carries the number of SSB repetitions within the same SSB cycle.

[0009] In one possible implementation, the number of SSB repetition transmissions S in the same SSB cycle is equal to the maximum number of SSB repetition receptions M.

[0010] In a possible implementation, the method further includes: based on the number of SIB repetitions P within the same system message block SIB period, receiving Q SIBs from a network device, the number of SIB repetitions P within the same SIB period is related to the number of SSB repetitions S within the same SSB period, the Q SIBs are located within the same SIB period, the Q SIBs are associated with N SSBs, P is an integer greater than 1, and Q is an integer greater than 0 and less than or equal to P. Since the terminal device needs to obtain cell information through the SIB before performing random access, based on this implementation, the terminal device receives a maximum of P SIBs within a SIB period, and the terminal device combines and parses the received SIBs. The more SIBs received, the more conducive it is to improving the probability of successfully parsing the SIB. Improving the probability of successfully parsing the SIB is conducive to the terminal device being able to obtain cell information more quickly, thereby reducing the delay of random access of the terminal device.

[0011] In a possible implementation, the number of repeated transmissions P of the SIB in the same SIB period is equal to the number of repeated transmissions S of the SSB in the same SSB period.

[0012] In a possible implementation, N SSBs belong to the first type of SSB, and at least one SIB among the Q SIBs indicates the number of repeated transmissions of the first type of SSB and the number of repeated transmissions of the second type of SSB. Based on this method, when the terminal device moves from the coverage area corresponding to the first type of SSB to the coverage area corresponding to the second type of SSB, the terminal device can receive the SSB according to the number of repeated transmissions of the second type of SSB indicated in the SIB. In some cases, the terminal device can receive all the SSBs sent by the network device as needed within one SSB cycle, and the terminal device merges and parses the received SSBs. The more SSBs are received, the more likely it is to improve the probability of successfully parsing the SSB.

[0013] In a possible implementation, the number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB. Exemplarily, if the coverage area corresponding to the first type of SSB is relatively close to the location of the network device, and the current communication quality of the terminal devices in the coverage area corresponding to the first type of SSB is relatively good, in this case, the number of repeated transmissions of the first type of SSB is relatively small, which is conducive to saving transmission resources. If the coverage area corresponding to the second type of SSB is relatively far from the location of the network device and / or the current communication quality of the terminal devices in the coverage area corresponding to the second type of SSB is relatively poor, in this case, the number of repeated transmissions of the second type of SSB is relatively large, which is conducive to enabling the terminal device to receive the SSB more times and increasing the probability of the terminal device successfully parsing the SSB.

[0014] In a possible implementation, the method is applied in a random access process, and the method further includes: based on the number of times L that a random access response RAR is repeatedly sent, receiving K RARs from a network device, where L is an integer greater than 1, and K is an integer greater than 0 and less than or equal to L. Based on this implementation, a terminal device can receive a maximum of L RARs at a time, and the terminal device parses the received RARs. The more RARs received, the more favorable it is to improve the probability of successfully parsing the RARs. Improving the probability of successfully parsing the RARs is conducive to reducing the delay of random access of the terminal device.

[0015] In a possible implementation, the number of repeated transmissions L of the RAR is related to the number of repeated transmissions S of the SSB in the same SSB cycle. The terminal device can determine the number of repeated transmissions L of the RAR by the number of repeated transmissions S of the SSB in the same SSB cycle, which is conducive to saving signaling overhead.

[0016] In a possible implementation, K RARs belong to the first type of RAR, and at least one SIB among the Q SIBs indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR. Based on this method, the terminal device can obtain the number of repeated transmissions of SSBs in the same SSB cycle through SSB, thereby determining the number of repeated transmissions of SIBs in the same SIB cycle.

[0017] In a possible implementation manner, the number of repeated transmissions of the first type of RAR is related to the coverage area corresponding to the first type of RAR, and the number of repeated transmissions of the second type of RAR is related to the coverage area corresponding to the second type of RAR.

[0018] In a possible implementation, the method further includes: based on the number of DCI repetition transmissions X, receiving at most Y DCIs from the network device, at least one of the Y DCIs indicating the time-frequency resources of at least one RAR among the K RARs, the number of DCI repetition transmissions is related to the number of SSB repetition transmissions S in the same SSB cycle, X is an integer greater than 1, and Y is an integer greater than 0 and less than or equal to X. Based on this implementation, the terminal device can receive up to Y DCIs at a time, and the terminal device parses the received DCIs. The more DCIs received, the more conducive it is to improve the probability of successfully parsing the DCIs. Improving the probability of successfully parsing the DCIs is conducive to reducing the delay of random access of the terminal device.

[0019] In a possible implementation, Y is equal to K, there is a one-to-one correspondence between the Y DCIs and the K RARs, and one DCI among the Y DCIs indicates the time-frequency resources of the corresponding RAR.

[0020] In a possible implementation manner, at least one DCI in the Y DCIs indicates the time-frequency resources of each RAR in the K RARs.

[0021] In a second aspect, an embodiment of the present application provides a communication method, the method comprising: based on the number of SSB repetitions within the SSB period of the same synchronization signal block, sending S SSBs, the S SSBs are located in the same SSB period, and S is an integer greater than 1.

[0022] Among them, the beneficial effects of the second aspect and its possible implementation methods can be found in the corresponding description of the first aspect, and will not be repeated here.

[0023] In one possible implementation, at least one SSB among the S SSBs carries the number of S SSB repetitions within the same SSB cycle.

[0024] In one possible implementation, the MIB included in at least one SSB among N SSBs carries the number of SSB repetitions within the same SSB cycle.

[0025] In a possible implementation, the method also includes: sending P SIBs based on the number of SIB repetitions P within the same system message block SIB period, the number of SIB repetitions P within the same SIB period is related to the number of SSB repetitions S within the same SSB period, the P SIBs are associated with the SSBs, and P is an integer greater than 1.

[0026] In a possible implementation, the number of repeated transmissions P of the SIB in the same SIB period is equal to the number of repeated transmissions S of the SSB in the same SSB period.

[0027] In one possible implementation, the S SSBs belong to a first type of SSBs, and at least one SIB among the P SIBs indicates the number of repeated transmissions of the first type of SSBs and the number of repeated transmissions of the second type of SSBs.

[0028] In one possible implementation, the number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB.

[0029] In a possible implementation, the method is applied in a random access process, and the method further includes: based on the number of times L that the random access response RAR is repeatedly sent, sending L RARs to the terminal device, where L is an integer greater than 1.

[0030] In a possible implementation, the number of RAR repetition transmissions L is related to the number of SSB repetition transmissions S in the same SSB cycle.

[0031] In a possible implementation, the L RARs belong to the first type of RAR, and at least one SIB among the P SIBs indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR.

[0032] In a possible implementation manner, the number of repeated transmissions of the first type of RAR is related to the coverage area corresponding to the first type of RAR, and the number of repeated transmissions of the second type of RAR is related to the coverage area corresponding to the second type of RAR.

[0033] In a possible implementation, the method further includes: based on the number of DCI repetitions X, sending X DCIs to the terminal device, at least one of the X DCIs indicating the time-frequency resources of at least one RAR among the L RARs, the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, and X is an integer greater than 1.

[0034] In a possible implementation, X is equal to L, there is a one-to-one correspondence between the X DCIs and the L RARs, and one DCI among the X DCIs indicates the time-frequency resources of the corresponding RAR.

[0035] In a possible implementation manner, at least one DCI in the X DCIs indicates the time-frequency resources of each RAR in the L RARs.

[0036] In a third aspect, the present application provides a communication device, wherein the communication device can be a terminal device, and can also be a chip system applied to a terminal device. The communication device can execute the method described in the first aspect. The functions of the communication device can be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module can be software and / or hardware. The operations and beneficial effects performed by the communication device can refer to the methods and beneficial effects described in the first aspect above, and the repeated parts will not be repeated.

[0037] In a fourth aspect, the present application provides a communication device, wherein the communication device may be a terminal device, or may be a chip system applied to a terminal device. The communication device may execute the method described in the second aspect. The functions of the communication device may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the method and beneficial effects described in the second aspect above, and the repeated parts will not be repeated.

[0038] In a fifth aspect, the present application provides a communication device, which may be a terminal device or a chip system applied to a terminal device. The communication device includes a processor. When the processor calls a computer program in a memory, the method described in the first aspect or the second aspect is executed.

[0039] In a possible implementation, the communication device further includes a memory, and the memory and the processor are coupled to each other. Optionally, the memory and the processor are integrated together.

[0040] In a possible implementation, the communication device further includes a transceiver, and the transceiver is used to send and receive data and / or signaling.

[0041] In a sixth aspect, the present application provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor executes the method described in the first aspect or the second aspect through a logic circuit or executing code instructions.

[0042] In a seventh aspect, the present application provides a computer-readable storage medium storing a computer program or instructions. When the computer program or instructions are executed by a communication device, the method described in the first aspect or the second aspect is executed.

[0043] In an eighth aspect, an embodiment of the present application provides a computer program or a computer program product, including codes or instructions. When the codes or instructions are executed on a computer, the computer executes the method described in the first aspect or the second aspect.

[0044] In a ninth aspect, an embodiment of the present application provides a communication system, which includes the communication device provided in the third and fourth aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0046] Figure 2 This is a schematic diagram of a four-step random access process provided by an embodiment of the present application;

[0047] Figure 3 This is a schematic diagram of a two-step random access process provided by an embodiment of the present application;

[0048] Figure 4 is a schematic diagram of a satellite coverage area provided in an embodiment of the present application;

[0049] Figure 5 It is a flow chart of a communication method provided in an embodiment of the present application;

[0050] Figure 6 is a schematic diagram of an SSB index provided in an embodiment of the present application;

[0051] Figure 7 is a schematic diagram of an SSB cycle provided in an embodiment of the present application;

[0052] Figure 8 to Figure 11 It is a flow chart of a communication method provided in an embodiment of the present application;

[0053] Fig.12 is a structural diagram of a communication device provided in an embodiment of the present application;

[0054] Fig.13 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0055] Fig.14 It is a schematic diagram of the structure of a chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0057] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0059] The following is an introduction to the system architecture involved in the embodiments of the present application:

[0060] It should be understood that the technical solution of the present application can be applied to non-terrestrial networks (NTN) or scenarios where NTN is integrated with terrestrial networks (TN). The technical solution of the embodiments of the present application can be applied to various communication systems, such as satellite communication systems and traditional mobile communication systems. Among them, the satellite communication system can be integrated with the traditional mobile communication system (i.e., terrestrial communication system). Communication systems such as wireless local area network (WLAN) communication system, wireless fidelity (WiFi) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), fifth generation (5G) th generation, 5G) systems or new radio (NR), and other future communication systems such as the sixth generation (6 thIt also supports communication systems that integrate multiple wireless technologies. For example, it can also be applied to systems that integrate non-terrestrial networks (NTN) with terrestrial mobile communication networks, such as drones, satellite communication systems, and high altitude platform station (HAPS) communications.

[0061] Figure 1 The communication system is an example of a communication system applicable to the embodiment of the present application. The communication system includes at least one network device and at least one terminal. Figure 1 The network device and multiple terminals are taken as examples. The multiple terminals can be cellular phones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radio devices, global positioning systems, personal digital assistants (PDAs) and / or any other suitable devices for communicating on a wireless communication system, and can all be connected to the network device. The multiple terminals can all communicate with the network device. Of course Figure 1 The number of terminals and network devices is just an example, and can be less or more.

[0062] The terminal device involved in the embodiments of the present application, which may also be referred to as a terminal, is an entity on the user side for receiving or transmitting signals. The terminal device may be a device that provides voice and / or data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device may also be other processing devices connected to a wireless modem. The terminal device may communicate with a radio access network (RAN). The terminal device may also be referred to as a wireless terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, or a UE, etc. The terminal device may be a mobile terminal, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device, which exchanges language and / or data with a wireless access network. For example, the terminal device may also be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), etc. Common terminal devices include, for example, mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, etc., but the embodiments of the present application are not limited thereto.

[0063] The embodiments of the present application do not limit the device form of the terminal. The device for implementing the function of the terminal can be a terminal; it can also be a device that can support the terminal to implement the function, such as a chip system. The device can be installed in the terminal or used in conjunction with the terminal. In the embodiments of the present application, the chip system can be composed of chips, or it can include chips and other discrete devices.

[0064] A network device is an entity on the network side that is used to send signals, or receive signals, or both send and receive signals. A network device may be a device deployed in a radio access network (RAN) to provide wireless communication functions for terminals.

[0065] In one possible scenario, the network device may be a device with base station functions, such as an evolved NodeB (eNodeB), a transmission and receiving point (TRP), a transmitting point (TP), a next generation NodeB (gNB), a next generation base station in a 6G mobile communication system, an integrated access and backhaul (IAB) node, a non-ground network device, that is, a device that can be deployed on a high altitude platform or a satellite, etc. The network device may be a transmission reception point (TRP), a base station, or various forms of control nodes. For example, a network controller, a wireless controller, etc. Specifically, the network device may be various forms of macro base stations, micro base stations (also called small stations) in heterogeneous network (HetNet) scenarios, relay stations, access points (APs), radio network controllers (RNCs), node Bs (NBs), base station controllers (BSCs), base transceiver stations (BTSs), home base stations (e.g., home evolved node Bs, or home node Bs, HNBs), baseband units (BBUs) and remote radio units (RRUs) in distributed base station scenarios, transmission points (TRPs), transmitting points (TPs), mobile switching centers, etc., and may also be antenna panels of base stations. The control node may connect to multiple base stations and configure resources for multiple terminals covered by multiple base stations. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, it may be the gNB in ​​5G, or the network side equipment in the network after 5G, or the network equipment in the future evolved public land mobile (communication) network (publicland mobile network, PLMN) network, or the equipment that performs the base station function in device-to-device (D2D) communication, machine-to-machine (M2M) communication, and Internet of Vehicles communication, etc. This application does not limit the specific name of the network equipment.The network equipment may also be an open access network (openRAN, O-RAN or ORAN), a baseband pool (BBU pool) and RRU under a cloud radio access network (CRAN), etc.

[0066] In another possible scenario, multiple network devices collaborate to assist the terminal in achieving wireless access, and different network devices respectively implement part of the functions of the base station. For example, the network device may include a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU may be set separately, or may be included in the same network element, such as a baseband unit (BBU). The RU may be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). It is understandable that the network device may be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into a network device in the access network RAN, or the CU may be divided into a network device in the core network CN, without limitation here.

[0067] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, CU, CU-CP, CU-UP, DU and RU are described as examples in this application. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0068] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile characteristic, for example, the network device may be a mobile device. In some embodiments, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc.

[0069] In the embodiments of the present application, the form of the network device is not limited. The device for realizing the function of the network device can be the network device; or it can be a device that can support the network device to realize the function, such as a chip system. The device can be installed in the network device or used in combination with the network device.

[0070] Some terms involved in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

[0071] 1. Random access (RA)

[0072] The random access process refers to the process from when the terminal device sends a random access preamble to try to access the network to when a basic signaling connection is established with the network. Through random access, the terminal device can enter the connected state from the idle state or inactive state, establish various bearers with the network device, obtain some necessary resources and parameter configurations, and then communicate with the network device.

[0073] In wireless communication systems such as LTE and 5G NR, terminal devices can use a four-step random access method, such as Figure 2 As shown:

[0074] S201, the terminal device sends a random access message 1 (Msg1) to the network device, and the content of Msg1 is a random access preamble. The terminal device sends the preamble to the network device for random access request, and the network device uses the random access preamble sent by the terminal device to estimate the transmission delay between it and the terminal device, so that the network device can calibrate the uplink timing.

[0075] S202, after receiving Msg1, the network device sends a random access message 2 (Msg2) to the terminal device. Msg2 may include timing offset (TA), uplink grant (UL grant), temporary cell radio network temporary identifier (TC-RNTI), power control (power control) and resource indication of the random access message 3 (Msg3) sent by the terminal device. Msg2 may also include other information, which is not limited in the embodiment of the present application.

[0076] S203, after the terminal device receives Msg2, if the random access preamble indicated by the sequence number of the random access preamble in the Msg2 is the same as the random access preamble sent by the terminal device to the network device in S201, the terminal device considers that the Msg2 is a random access response to the terminal device, and sends message 3 (Msg3) on the uplink channel resource indicated by Msg2. Msg3 may carry a unique user identifier.

[0077] S204, after receiving Msg3 from the terminal device, the network device returns a random access message 4 (Msg4) to the terminal device that has successfully accessed. The network device will carry the unique user identifier in Msg3 in Msg4 to specify the terminal device that has successfully accessed, and other terminal devices that have not successfully accessed will re-initiate random access.

[0078] For ultra-reliable and low latency communications (URLLC) services, the four information exchanges in the four-step random access process will produce a high latency, which is not conducive to the low latency requirement of URLLC. A two-step random access process is also proposed in this field, such as Figure 3 As shown:

[0079] S301. The terminal device sends a random access message A (MsgA) to the network device, where MsgA includes a preamble and data.

[0080] S302: The network device sends a random access message B (MsgB) to the terminal device.

[0081] With the development of the times, more and more areas are beginning to need to use the Internet. In order to support wider business coverage, network equipment may need to provide network services for a larger communication area. Taking NTN as an example, network equipment can usually cover a large area. Under a given link budget and system resources, the satellite network improves the coverage area of ​​a single beam through beam design to improve the coverage of the entire satellite. Due to the limited coverage range of a single beam, a single satellite still requires a large number of beams to achieve full coverage. For satellite scenarios, the link budgets of sub-satellite and edge point beams are different due to differences in transmission distances. For example Figure 4 As shown, UE1 is in the sub-satellite area, with a short transmission distance, a good beam link budget, and good signal transmission performance; while UE2 is in the edge area, with a long transmission distance, a poor beam link budget, and poor signal transmission performance.

[0082] Before initiating random access, the synchronization signal / physical broadcast channel block (SS / PBCH block or SSB) sent by the network device can be used to confirm the time and frequency resources of the system information block (SIB) for the terminal. The synchronization signal / broadcast signal block can also be referred to as the synchronization signal block. The terminal device can obtain the cell information by parsing the SIB, thereby initiating random access. SSB is usually sent periodically, once per cycle. And in order to increase the coverage area, it is usually sent in a wide beam. And a wide beam means an increase in path loss, especially for Figure 4 The network edge area where UE2 is located. When the transmission performance is poor, the terminal device may not be able to successfully receive and read the SSB, affecting the random access performance of the terminal device. How to ensure that the terminal device stably completes random access and reduces access delay is an urgent problem to be solved.

[0083] In order to reduce the delay of random access of terminal devices, this application proposes a communication method, see Figure 5 . Figure 5 is a flow chart of a communication method provided in an embodiment of the present application. Figure 5 As shown, the communication method includes the following steps 501 to 503. Figure 5 The method shown may be executed by a terminal device and a network device, or may be executed by a chip in the terminal device and a chip in the network device. Figure 5 The terminal device and the network device are used as the execution subject of the method for illustration. The embodiment of the present application does not limit the execution subject of the communication method. The terminal device and the network device can be Figure 1 The terminal equipment and network equipment shown in the figure. Among them:

[0084] 501. The terminal device determines the maximum number of repeated reception times M of SSB based on the first parameter.

[0085] In the embodiment of the present application, the maximum number of repeated receptions of SSB M refers to the maximum number of times a terminal device receives an SSB in one SSB cycle, and can also be understood as that the number of SSBs received by the terminal device in one SSB cycle does not exceed M, where M is an integer greater than 0. The first parameter indicates the signal quality between the terminal device and the network device. The first parameter can be a parameter obtained after the terminal device measures the first signal sent by the network device, and optionally, the first signal can be an SSB. Optionally, the first parameter can be one or more of a reference signal receiving power (RSRP), a reference signal receiving quality (RSRQ), or a received signal strength indication (RSSI), and can also be understood as that the first parameter can be determined based on one or more parameters of RSRP, RSSI, or RSRQ. Exemplarily, the first parameter is determined based on RSRP or RSRQ, as well as the weight corresponding to RSRP and the weight corresponding to RSRQ, and the value of the first parameter can be calculated by the following formula (1):

[0086] I=αI RSRP +βI RSRQ (1)

[0087] I represents the first parameter, I RSRP represents RSRP, I RSRQ represents RSRQ, α represents the weight corresponding to RSRP, β represents the weight corresponding to RSRQ, and α and β can be preset.

[0088] In a possible implementation, the terminal device may determine the maximum number of repeated receptions of the SSB based on the first parameter and the parameter threshold. For example, when the first parameter is greater than the parameter threshold, the maximum number of repeated receptions of the SSB is a first value; when the first parameter is less than or equal to the parameter threshold, the maximum number of repeated receptions of the SSB is a second value, and the second value is greater than the first value. Optionally, the parameter threshold may be configured by the network device, or may be pre-set. This example only shows the case of one parameter threshold, and the parameter threshold may also include multiple ones, which is not limited in the embodiments of the present application.

[0089] Based on this implementation, if the first parameter is greater than the parameter threshold, it means that the current transmission link performance of the terminal device is good. In this case, the smaller the value of the determined maximum number of repeated receptions of SSB is, the better it is to avoid the terminal device from receiving SSB multiple times, thereby reducing the energy consumption of the terminal device. If the first parameter is less than or equal to the parameter threshold, it means that the current transmission link performance of the terminal device is poor. In this case, the larger the value of the determined maximum number of repeated receptions of SSB is, the better it is for the terminal device to receive SSB more times, thereby increasing the probability of the terminal device successfully parsing SSB and ensuring the performance of random access of the terminal device.

[0090] The method described in the embodiment of the present application can be applied to both satellite networks and terrestrial networks. Optionally, the terminal device can use the same parameter threshold in the satellite network and the terrestrial network. For the terminal device, the demodulation threshold of the same downlink channel is basically the same, so an integrated design can be adopted to reduce the processing complexity of the terminal device and facilitate the compatibility of different networks.

[0091] 502. The network device sends S SSBs based on the number of S SSB repetitions in the same SSB cycle.

[0092] In the embodiment of the present application, the number of repeated transmissions S of the SSB in the same SSB cycle refers to the number of SSBs in the same beam direction sent by the network device in one SSB cycle, or the number of SSBs corresponding to the same coverage area sent by the network device in one SSB cycle. It can be understood that the S SSBs sent by the network device are located in the same SSB cycle, and at the same time, the beam directions or coverage areas corresponding to the S SSBs are the same. Among them, S is an integer greater than 1. It should be noted that the transmission time between two SSBs in the S SSBs can be the same or different. The embodiment of the present application does not limit the transmission time corresponding to the S SSBs sent in one cycle. For example, the transmission time of the S SSBs can be different from each other, and the length of the time interval between two adjacent SSBs sent is equal.

[0093] In the embodiments of the present application, the beam refers to the main lobe of the directional array diagram, and the coverage area corresponding to the beam refers to the projection range of the beam on the ground surface. The network device can adjust the weights of the antenna so that the transmitted beam can point to different directions and have different coverage ranges. The coverage range corresponding to the beam described in the embodiments of the present application refers to the coverage range of the beam on the ground. As the satellite moves and the antenna weights are adjusted, the coverage range will change.

[0094] Alternatively, the number of SSB repetitions within the same SSB cycle can also be understood as the number of repetitions of the first type of SSB within the same SSB cycle. The S SSBs belong to the first type of SSB, and the corresponding beam directions or coverage areas of the SSBs belonging to the same type are the same. The number of repetitions of the first type of SSB is related to the beam direction or coverage area corresponding to the first type of SSB. Among them, the network device can send at least one type of SSB, and the at least one type of SSB includes the first type of SSB. The beam directions corresponding to the SSBs belonging to the same type are the same, and the coverage areas corresponding to the transmission beams corresponding to the SSBs belonging to the same type are the same. It can be understood that the S SSBs all belong to the first type of SSB, the beam directions corresponding to the S SSBs are the same, and the coverage areas corresponding to the beams of the S SSBs are the same. The coverage area corresponding to the first type of SSB can be understood as the ground area covered by the beam of the first type of SSB or the corresponding coverage area.

[0095] Among them, within the same SSB period, the number of repeated transmissions of SSBs in different SSB beam directions or corresponding to different coverage areas may be the same or different. In a possible implementation, the number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB. Exemplarily, it is assumed that the network device also sends a second type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB, and the coverage area corresponding to the second type of SSB is different from the coverage area corresponding to the first type of SSB. The distance between the coverage area corresponding to the second type of SSB and the network device is farther than the distance between the coverage area corresponding to the first type of SSB and the network device. The coverage area corresponding to the first type of SSB is relatively close to the location of the network device, for example, the coverage area corresponding to the first type of SSB is located within the range of the sub-satellite area, and the network device can determine that the number of repeated transmissions of the first type of SSB is a first value; the coverage area corresponding to the second type of SSB is relatively far from the location of the network device, for example, the coverage area corresponding to the second type of SSB is located in the edge area, and the network device can determine that the number of repeated transmissions of the first type of SSB is a second value, wherein the second value is greater than the first value.

[0096] It can be understood that the coverage area corresponding to the first type of SSB is relatively close to the location of the network device, and the current communication quality of the terminal devices in the coverage area corresponding to the first type of SSB is relatively good. In this case, the number of repeated transmissions of the first type of SSB is relatively small, which is conducive to saving transmission resources. The coverage area corresponding to the second type of SSB is relatively far from the location of the network device and / or the current communication quality of the terminal devices in the coverage area corresponding to the second type of SSB is relatively poor. In this case, the number of repeated transmissions of the second type of SSB is relatively large, which is conducive to enabling the terminal device to receive the SSB more times and improve the probability of the terminal device successfully parsing the SSB.

[0097] Optionally, the SSB indexes of SSBs that do not belong to the same category are different, and the SSB indexes of SSBs that belong to the same category may be the same or different. Taking the first category SSB and the second category SSB as an example, Figure 6 As shown, it is assumed that the number of repeated transmissions corresponding to the first type of SSB is 4 times, and the number of repeated transmissions corresponding to the second type of SSB is 2 times. In scenario 1, the SSBs belonging to the same category have different SSBindexes, where the SSB indexes of the four SSBs corresponding to the first type of SSB are 0, 1, 2, and 3, respectively, and the SSB indexes of the two SSBs corresponding to the second type of SSB are 4 and 5, respectively. In scenario 2, the SSB indexes of the SSBs belonging to the same category are the same, where the SSB indexes of the four SSBs corresponding to the first type of SSB are all 0, and the SSB indexes of the two SSBs corresponding to the second type of SSB are all 4.

[0098] It should also be noted that in the above implementation, the network device sends two types of SSB (first type SSB and second type SSB) as an example. In the embodiment of the present application, the network device can also send more types of SSB. For example, the network device can also send third type SSB, fourth type SSB, etc., which is not limited in the embodiment of the present application. In addition, the above examples all use the different number of repeated transmissions of the first type SSB and the second type SSB as an example, wherein the number of repeated transmissions of the first type SSB and the second type SSB may also be the same. It can be understood that the repeated transmissions of different types of SSB may be the same or different.

[0099] In a possible implementation, the number of SSB repetitions corresponding to different SSB periods may be the same or different. Further, optionally, in different SSB periods, the number of SSB repetitions corresponding to the same SSB beam direction or the same coverage area may be the same or different. Figure 7 As shown, Figure 7Two adjacent SSB cycles are included, namely the first SSB cycle and the second SSB cycle. In scenario 1, the network device sends 3 SSBs in the first SSB cycle, and the beam directions or coverage areas corresponding to the 3 SSBs are the same. In the second SSB cycle, the network device sends 2 SSBs, and the beam directions or coverage areas corresponding to the 2 SSBs are the same, wherein the beam directions or coverage areas corresponding to the 3 SSBs sent in the first SSB cycle and the 2 SSBs sent in the second SSB cycle are the same, and the number of SSB repetitions corresponding to the first SSB cycle is different from the number of SSB repetitions corresponding to the second SSB cycle, that is, the number of SSB repetitions corresponding to different SSB cycles is different. In scenario 2, the network device sends 2 SSBs in the first SSB cycle, and the network device sends 2 SSBs in the second SSB cycle, and the number of SSB repetitions corresponding to the first SSB cycle is the same as the number of SSB repetitions corresponding to the second SSB cycle, that is, the number of SSB repetitions corresponding to different SSB cycles is the same.

[0100] 503. The terminal device receives N SSBs from the network device based on the maximum number of repeated reception times M of the SSB.

[0101] In the embodiment of the present application, since the maximum number of repeated receptions of the SSB determined by the terminal device is M, the number of SSBs N received in one SSB cycle does not exceed M, that is, N is less than or equal to M and an integer greater than 0. In conjunction with the network device side, the network device sends S SSBs in the corresponding SSB cycle, and the N SSBs received by the terminal device are N of the S SSBs. It can be understood that N is an integer less than or equal to S and greater than 0.

[0102] Because the terminal device needs to obtain cell information through SIB before random access, and SSB carries information indicating the search space where the control resource set (Control Resource Set, CORESET) of the SIB is located. Based on the method described in the embodiment of the present application, the terminal device receives a maximum of M SSBs in one SSB cycle, and the terminal device merges and parses the received SSBs. The more SSBs received, the more conducive it is to improve the probability of successfully parsing the SSB. Improving the probability of successfully parsing the SSB is conducive to the terminal device being able to determine the SIB more quickly and obtain cell information, thereby reducing the delay of random access of the terminal device.

[0103] In one SSB cycle, the terminal device may attempt to parse the SSB multiple times. For example, in one SSB cycle, each time the terminal device receives an SSB, it may combine the SSB with the SSB previously received in the SSB cycle for parsing.

[0104] Exemplarily, assuming that M is equal to 3, in an SSB cycle, after the terminal device receives 1 SSB, if the terminal device successfully parses based on 1 SSB, the terminal device may not need to continue to receive the SSB. If the terminal device fails to parse based on 1 SSB, the terminal device receives the next SSB in the SSB cycle, and then merges and parses the two SSBs. If the parsing is successful, the terminal device does not need to continue to receive the SSB. If the reception fails, the terminal device continues to receive the next SSB in the SSB cycle in the same way. That is, the terminal device can try to parse the SSB 3 times, respectively, parsing the received 1 SSB, parsing the received 2 SSBs, and parsing the received 3 SSBs.

[0105] When the number of SSBs received by the terminal device in one SSB cycle is equal to M, and the terminal device fails to merge and parse the M SSBs, the terminal device will not continue to receive SSBs in this SSB cycle, but will wait for the next SSB cycle and receive SSBs in the next SSB cycle.

[0106] In one possible implementation, the number of SSB repetitions S in the same SSB cycle is equal to the maximum number of SSB repetitions M. In this implementation, the terminal device receives one or more of the S SSBs sent by the network device as needed, thereby improving the success rate of parsing the SSB.

[0107] It should also be noted that M can also be less than S. In this case, the terminal device will receive SSB based on M. Even if the network device sends S SSBs within the SSB cycle, the terminal device will only receive M SSBs out of the S SSBs at most. Even if the terminal device receives M SSBs but still fails to parse out the SSB, the terminal device will no longer receive the SSB. In this case, the terminal device receives SSB based on M. If the terminal device parses out the SSB when the number of received SSBs is less than or equal to M, the terminal device will no longer continue to receive the SSB. If the number of SSBs received by the terminal device is equal to M and the SSB is still not parsed, the terminal device will not be able to parse out the SSB within the SSB cycle. Even if the terminal device continues to try to receive the SSB within the SSB cycle, it may not be able to receive the SSB within the SSB cycle or the received SSB is not what the terminal device needs. Therefore, the terminal device still fails to parse successfully after the number of received SSBs exceeds M, and it cannot parse the SSB in the subsequent SSB cycle.

[0108] In a possible implementation, when the terminal device is located in an area with poor transmission quality, the success rate of the terminal device parsing the SIB is low, and the cell information carried in the SIB is necessary information for the terminal device to initiate random access. Therefore, the network device can also use the method of repeatedly sending the SIB to improve the success rate of the terminal device parsing the SIB and reduce the access delay of the terminal device. The implementation method will be briefly introduced below. The specific description of the implementation method can be found in the corresponding description of 8, which will not be repeated here.

[0109] The terminal device receives Q SIBs from the network device based on the number of SIB repetitions P in the same system message block SIB period, the number of SIB repetitions P in the same SIB period is related to the number of SSB repetitions S in the same SSB period, the Q SIBs are located in the same SIB period, the Q SIBs are associated with N SSBs, P is an integer greater than 1, and Q is an integer greater than 0 and less than or equal to P. Correspondingly, the network device sends P SIBs based on the number of SIB repetitions P in the same system message block SIB period, the number of SIB repetitions P in the same SIB period is related to the number of SSB repetitions S in the same SSB period, and P SIBs are associated with S SSBs.

[0110] Because the terminal device needs to obtain cell information through SIB before random access, based on this implementation, the terminal device receives a maximum of P SIBs in one SIB cycle, and the terminal device merges and parses the received SIBs. The more SIBs received, the more likely it is to successfully parse the SIBs. Improving the probability of successfully parsing the SIBs is conducive to the terminal device being able to obtain cell information faster, thereby reducing the latency of random access of the terminal device.

[0111] Optionally, at least one of the SSBs carries the number of SSB repetitions S in the same SSB cycle, where S is an integer greater than 1. Further optionally, at least one of the SSBs includes an MIB that carries the number of SSB repetitions S in the same SSB cycle.

[0112] Optionally, the number of repeated transmissions P of the SIB in the same SIB period is equal to the number of repeated transmissions S of the SSB in the same SSB period.

[0113] Optionally, the S SSBs belong to a first type of SSB, and at least one of the P SIBs indicates the number of repeated transmissions of the first type of SSB and the number of repeated transmissions of the second type of SSB. Further optionally, the number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB.

[0114] In one possible implementation, the terminal device receives a random access response (Random Access Response, RAR) from the network device during the process of initiating random access, where RAR may refer to Msg2 in four-step random access or MsgB in two-step random access. When the terminal device is located in an area with poor transmission quality, the success rate of the terminal device parsing RAR is low, but the terminal device needs to parse RAR to complete random access. The network device may also repeatedly send RAR to improve the success rate of the terminal device parsing RAR and reduce the access delay of the terminal device. The implementation method is briefly introduced below. The specific description of the implementation method can be found in the corresponding description of 9, which will not be repeated here.

[0115] The terminal device receives K RARs from the network device based on the number of L repetitions of random access response RAR transmission, where L is an integer greater than 1 and K is an integer greater than 0 and less than or equal to L. Correspondingly, the network device sends L RARs to the terminal device based on the number of L repetitions of random access response RAR transmission.

[0116] Based on this implementation, the terminal device can receive up to L RARs at a time, and the terminal device parses the received RARs. The more RARs received, the more likely it is to successfully parse the RARs. Improving the probability of successfully parsing the RARs is beneficial to reducing the random access delay of the terminal device.

[0117] Optionally, the number of RAR repetition transmissions L is related to the number of SSB repetition transmissions S in the same SSB cycle.

[0118] Optionally, the L RARs belong to the first type of RAR, and at least one SIB among the P SIBs indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR. Further optionally, the number of repeated transmissions of the first type of RAR is related to the coverage area corresponding to the first type of RAR, and the number of repeated transmissions of the second type of RAR is related to the coverage area corresponding to the second type of RAR.

[0119] In one possible implementation, before receiving the RAR, the terminal device needs to determine the time-frequency resources that carry the RAR through downlink control information (DCI). When the terminal device is located in an area with poor transmission quality, the terminal device has a low success rate in parsing the DCI, but the terminal device needs to parse the DCI to determine the time-frequency resources where the RAR is located. The network device can also use the method of repeatedly sending DCI to improve the success rate of the terminal device in parsing the DCI and reduce the access delay of the terminal device. The implementation method is briefly introduced below. For a detailed description of the implementation method, please refer to Fig.10The corresponding description will not be repeated here.

[0120] The terminal device receives at most Y DCIs from the network device based on the number of DCI repetitions X, where at least one DCI among the Y DCIs indicates the time-frequency resources of at least one RAR among the K RARs, and the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, where X is an integer greater than 1, and Y is an integer greater than 0 and less than or equal to X. Correspondingly, the network device sends X DCIs to the terminal device based on the number of DCI repetitions X.

[0121] Based on this implementation, the terminal device can receive up to Y DCIs at a time, and the terminal device parses the received DCIs. The more DCIs received, the more likely it is to successfully parse the DCIs. Increasing the probability of successfully parsing the DCIs is beneficial to reducing the random access delay of the terminal device.

[0122] Optionally, X is equal to L, there is a one-to-one correspondence between the X DCIs and the L RARs, and one DCI among the X DCIs indicates the time-frequency resources of the RAR corresponding thereto.

[0123] Optionally, at least one DCI among the X DCIs indicates the time-frequency resources of each RAR among the L RARs.

[0124] When a terminal device is located in an area with poor transmission quality, the terminal device has a low success rate in parsing SIBs, and the cell information carried in SIBs is necessary information for the terminal device to initiate random access. The low success rate in parsing SIBs will affect the random access performance of the terminal device. How to ensure that the terminal device can stably complete random access and reduce access delay is an urgent problem to be solved.

[0125] In order to reduce the delay of random access of terminal devices, this application proposes a communication method, see Figure 8 . Figure 8 is a flow chart of a communication method provided in an embodiment of the present application. Figure 8 As shown, the communication method includes the following steps 801 and 802. Figure 8 The method shown may be executed by a terminal device and a network device, or may be executed by a chip in the terminal device and a chip in the network device. Figure 3 The terminal device and the network device are used as the execution subject of the method for illustration. The embodiment of the present application does not limit the execution subject of the communication method. The terminal device and the network device can be Figure 1 The terminal equipment and network equipment shown in the figure. Among them:

[0126] 801. The network device sends P SIBs based on the number of SIB repetitions P in the same SIB period.

[0127] 802. The terminal device receives Q SIBs from the network device.

[0128] In an embodiment of the present application, the number of SIB repetitions P within the same SIB cycle refers to the number of SIBs in the same beam direction sent by the network device within a SIB cycle, or the number of SIBs corresponding to the same coverage area sent by the network device within a SIB cycle. It can be understood that the P SIBs sent by the network device are located in the same SIB cycle, and at the same time, the beam directions or coverage areas corresponding to the P SIBs are the same. Alternatively, the number of SIB repetitions S within the same SIB cycle can also be understood as the number of repetitions of the first type of SIB within the same SIB cycle. The P SIBs belong to the first type of SIBs, and the SIBs belonging to the same type have the same corresponding beam direction or coverage area. Among them, P is an integer greater than 1, and the transmission times of the P SIBs are different. Correspondingly, the Q SIBs received by the terminal device within a SIB cycle all belong to the P SIBs sent by the network device, that is, Q is an integer less than or equal to P and greater than 0.

[0129] Among them, in the same SIB period, the number of repeated transmissions of SSBs in different SIB beam directions or corresponding to different coverage areas may be the same or different, and in different SSB periods, the number of repeated transmissions of SSBs in the same SSB beam direction or corresponding to the same coverage area may be the same or different. This embodiment of the application is not limited to this.

[0130] Because the terminal device needs to obtain cell information through SIB before random access, based on the method described in the embodiment of the present application, the terminal device receives a maximum of P SIBs in one SIB cycle, and the terminal device merges and parses the received SIBs. The more SIBs received, the more likely it is to successfully parse the SIBs. Improving the probability of successfully parsing the SIBs is conducive to the terminal device being able to obtain cell information faster, thereby reducing the delay of random access of the terminal device.

[0131] In one possible implementation, within a SIB cycle, the terminal device may attempt to parse the SIB multiple times. For example, within a SIB cycle, each time the terminal device receives a SIB, it may perform a combined analysis based on all SIBs currently received within the SIB cycle. Among them, the number of SIBs received by the terminal device within a SIB cycle does not exceed the maximum number of SIB repeated receptions W, where W is an integer greater than 1. Optionally, the number of SIB repeated transmissions P within the same SIB cycle is equal to the maximum number of SIB repeated receptions W, and the terminal device may obtain the number of SIB repeated transmissions P within the same SIB cycle through a network device. Optionally, the maximum number of SIB repeated receptions W is determined based on a first parameter, and the specific implementation method in which the terminal device determines the maximum number of SIB repeated receptions W based on the first parameter is the same as step 501, and the embodiments of the present application are not described in detail here.

[0132] Exemplarily, assuming that W is equal to 3, in a SIB cycle, the terminal device receives a SIB. If the terminal device successfully parses based on the SIB, the terminal device does not need to continue to receive the SIB. If the terminal device fails to parse based on the SIB, the terminal device receives the next SIB in the SIB cycle, and then merges and parses the two SIBs. If the parsing is successful, the terminal device does not need to continue to receive the SIB. If the reception fails, the terminal device continues to receive the next SIB in the SIB cycle in the same way. That is, the terminal device can try to parse the SIB three times, respectively parsing the received 1 SIB, parsing the received 2 SIBs, and parsing the received 3 SIBs.

[0133] When the number of SIBs received by the terminal device in one SIB cycle is equal to W, and the terminal device fails to merge and parse the W SIBs, the terminal device will not continue to receive SIBs in the SIB cycle, but will wait for the next SIB cycle and receive SIBs in the next SIB cycle.

[0134] In one possible implementation, the number of repetitions P of the SIB in the same SIB period is related to the number of repetitions S of the SSB in the same SSB period. The P SIBs are associated with S SSBs, where the S SSBs are SSBs sent by the network device in the same SSB period. The specific implementation of the network device sending the S SSBs can be found in the above Figure 5 In the implementation, the number of repeated transmissions of SIB is extended according to the number of repeated transmissions of SSB, which is beneficial to improving the demodulation performance of SIB.

[0135] P SIBs are associated with S SSBs. Specifically, the time-frequency resources where the P SIBs are located are determined based on at least one SSB among the S SSBs, and the beam directions or coverage areas corresponding to the P SIBs and the S SSBs are the same. At least one SSB among the S SSBs indicates the search space where the CORESET for scheduling at least one SIB among the P SIBs is located. Optionally, each SSB among the S SSBs indicates the search space where the CORESET for scheduling at least one SIB among the P SIBs is located. The SSB indicates the search space where the CORESET of the SIB is located, and the terminal device monitors the DCI carried on the physical downlink control channel (PDCCH) that schedules the SIB in the search space. In addition, the direction of the beam used to send the P SIBs is the same as the direction of the beam used to send the S SSBs, and the coverage area corresponding to the beam used to send the P SIBs is the same as the coverage area corresponding to the beam used to send the S SSBs.

[0136] The number of repeated transmissions P of the SIB in the same SIB cycle is related to the number of repeated transmissions S of the SSB in the same SSB cycle, which means that the number of repeated transmissions P of the SIB in the same SIB cycle can be determined based on the number of repeated transmissions S of the SSB in the same SSB cycle. Optionally, the correspondence between the number of repeated transmissions P of the SIB in the same SIB cycle and the number of repeated transmissions S of the SSB in the same SSB cycle can be preset, and the terminal device can determine the number of repeated transmissions P of the SIB in the same SIB cycle according to the relationship after obtaining the number of repeated transmissions S of the SSB in the same SSB cycle. For example, the following List 1 is the correspondence between the number of repeated transmissions P of the SIB in the same SIB cycle and the number of repeated transmissions S of the SSB in the same SSB cycle pre-configured by the network device.

[0137] Table 1

[0138] The number of SSB repetitions in the same SSB cycle S The number of repetitions of SIB in the same SIB cycle is P 3 4 4 5 6 7

[0139] When the terminal device determines that the number of SSB repetitions S in the same SSB period is 3 based on the coverage area corresponding to the SSB beam, the terminal device can determine through Table 1 that the number of SIB repetitions P in the same SIB period corresponding to the SIB associated with the SSB is 4.

[0140] It should also be noted that the above example shows in a table the correspondence between the number of SSB repetitions S in the same SSB period and the number of SIB repetitions P in the same SIB period. The correspondence between the two can also be defined in other ways, such as by a function, for example, the relationship between P and S is defined as P=S+1 or P=2S or P=S / 2, etc.

[0141] For another example, it is also possible to define that the number of repeated transmissions P of the SIB in the same SIB period is equal to the number of repeated transmissions S of the SSB in the same SSB period. Exemplarily, assuming that the number of repeated transmissions of the SSB in the same SSB period is 3 times, then the number of repeated transmissions of the SIB in the same SIB period is 3 times. The embodiment of the present application does not limit how to define the correspondence between the number of repeated transmissions S of the SSB in the same SSB period and the number of repeated transmissions P of the SIB in the same SIB period.

[0142] Optionally, the specific implementation method for the terminal device to obtain the number of SSB repetitions in the same SSB cycle is as follows: the terminal device receives at least one of the N SSBs from the network device, which carries the number of SSB repetitions in the same SSB cycle, and the N SSBs are N of the S SSBs sent by the network device. For the network device side, at least one of the SSBs carries the number of SSB repetitions in the same SSB cycle. Further optionally, each of the S SSBs carries the number of SSB repetitions in the same SSB cycle. For the terminal device side, each of the N SSBs received by the terminal device carries the number of SSB repetitions in the same SSB cycle. Based on this method, the terminal device can obtain the number of SSB repetitions in the same SSB cycle through the SSB, thereby determining the number of SSB repetitions in the same SIB cycle. Further optionally, the number of SSB repetitions in the same SSB cycle is carried in the master information block (Master Indication Block, MIB) of the SSB.

[0143] Optionally, the S SSBs sent by the network device belong to the first category of SSBs, and at least one of the P SIBs indicates the number of repeated transmissions of the first category of SSBs and the number of repeated transmissions of the second category of SSBs. Among them, the N SSBs received by the terminal device belong to the first category of SSBs, and at least one of the Q SIBs indicates the number of repeated transmissions of the first category of SSBs and the number of repeated transmissions of the second category of SSBs. Further optionally, each of the P SIBs indicates the number of repeated transmissions of the first category of SSBs and the number of repeated transmissions of the second category of SSBs. Corresponding to the terminal device side, each of the Q SIBs received indicates the number of repeated transmissions of the first category of SSBs and the number of repeated transmissions of the second category of SSBs.

[0144] Among them, the network device can send at least one type of SSB, the beam directions corresponding to the SSBs belonging to the same type are the same, and the coverage areas corresponding to the transmission beams corresponding to the SSBs belonging to the same type are also the same. It can be understood that the S SSBs all belong to the first type of SSB, the beam directions corresponding to the S SSBs are the same, and the coverage areas corresponding to the beams used to send the S SSBs are the same. In the above implementation, two types of SSBs (first type SSBs and second type SSBs) are used as examples. In an embodiment of the present application, the SIB can also indicate the number of repeated transmissions of more types of SSBs, for example, third type SSBs, fourth type SSBs, etc., which are not limited in the embodiments of the present application.

[0145] Based on this method, when the terminal device moves from the coverage area corresponding to the first type of SSB to the coverage area corresponding to the second type of SSB, the terminal device can receive the SSB according to the number of repeated transmissions of the second type of SSB indicated in the SIB. In some cases, the terminal device can receive all SSBs sent by the network device as needed within one SSB cycle. The terminal device merges and parses the received SSBs. The more SSBs received, the more favorable it is to increase the probability of successfully parsing the SSB.

[0146] Further optionally, the number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB. Exemplarily, it is assumed that the distance between the coverage area corresponding to the second type of SSB and the network device is farther than the distance between the coverage area corresponding to the first type of SSB and the network device. The coverage area corresponding to the first type of SSB is relatively close to the location of the network device, for example, the coverage area corresponding to the first type of SSB is within the sub-satellite area, and the network device can determine that the number of repeated transmissions of the first type of SSB is a first value; the coverage area corresponding to the second type of SSB is relatively far from the location of the network device, for example, the coverage area corresponding to the second type of SSB is within the edge area, and the network device can determine that the number of repeated transmissions of the first type of SSB is a second value, wherein the second value is greater than the first value.

[0147] It can be understood that the coverage area corresponding to the first type of SSB is relatively close to the location of the network device, and the current communication quality of the terminal devices in the coverage area corresponding to the first type of SSB is relatively good. In this case, the number of repeated transmissions of the first type of SSB is relatively small, which is conducive to saving transmission resources. The coverage area corresponding to the second type of SSB is relatively far from the location of the network device and / or the current communication quality of the terminal devices in the coverage area corresponding to the second type of SSB is relatively poor. In this case, the maximum number of repeated receptions of the second type of SSB is relatively large, which is conducive to allowing the terminal device to receive SSB more times and increase the probability of the terminal device successfully parsing SSB.

[0148] In a possible implementation manner, the P SIBs belong to a first type of SIB, and the number of repeated transmissions of the first type of SIB is related to a coverage area corresponding to the first type of SIB.

[0149] Among them, the network device can send at least one type of SIB, and the at least one type of SIB includes a first type of SIB. The beam directions corresponding to the SIBs belonging to the same type are the same, and the coverage areas corresponding to the transmission beams corresponding to the SIBs belonging to the same type are also the same. It can be understood that the P SIBs sent by the network device in step 801 all belong to the first type of SIB, the beam directions corresponding to the P SIBs are the same, and the coverage areas corresponding to the beams used to send the P SIBs are the same. The coverage area corresponding to the first type of SIB can be understood as the coverage area corresponding to the beam used to send the first type of SIB.

[0150] The number of repeated transmissions of the first type of SIB is related to the coverage area corresponding to the first type of SIB. Exemplarily, it is assumed that the network device also transmits the second type of SIB, and the number of repeated transmissions of the second type of SIB is related to the coverage area corresponding to the second type of SIB. Among them, the distance between the coverage area corresponding to the second type of SIB and the network device is farther than the distance between the coverage area corresponding to the first type of SIB and the network device. The coverage area corresponding to the first type of SIB is relatively close to the location of the network device. For example, when the coverage area corresponding to the first type of SIB is located in the sub-satellite area, the network device can determine that the number of repeated transmissions of the first type of SIB is a first value; the coverage area corresponding to the second type of SIB is relatively far from the location of the network device. For example, the coverage area corresponding to the second type of SIB is located in the edge area. The network device can determine that the number of repeated transmissions of the first type of SIB is a second value, wherein the second value is greater than the first value.

[0151] It can be understood that the coverage area corresponding to the first type of SIB is relatively close to the location of the network device, and the current communication quality of the terminal devices in the coverage area corresponding to the first type of SIB is relatively good. In this case, the number of repeated transmissions of the first type of SIB is small, which is conducive to saving transmission resources. The coverage area corresponding to the second type of SIB is relatively far from the location of the network device, and the current communication quality of the terminal devices in the coverage area corresponding to the second type of SIB is relatively poor. In this case, the maximum number of repeated receptions of the second type of SIB is large, which is conducive to allowing the terminal device to receive the SIB more times and increase the probability of the terminal device successfully parsing the SIB.

[0152] It should be supplemented that, in the above implementation, the network device sends two types of SIBs (first type SIB and second type SIB) as an example. In the embodiment of the present application, the network device can also send more types of SIBs. For example, the network device can also send third type SIBs, fourth type SIBs, etc., and the embodiment of the present application does not limit this. In addition, the above examples all use the different number of repeated transmissions of the first type SIB and the second type SIB as an example, wherein the number of repeated transmissions of the first type SIB and the second type SIB may also be the same. It can be understood that the repeated transmissions of different types of SIBs may be the same or different.

[0153] In one possible implementation, the terminal device needs to receive a random access response (Random Access Response, RAR) from the network device during the process of initiating random access, where RAR may refer to Msg2 in four-step random access or MsgB in two-step random access. When the terminal device is located in an area with poor transmission quality, the success rate of the terminal device parsing RAR is low, but the terminal device needs to parse RAR to complete random access. The network device can also use the method of repeatedly sending RAR to improve the success rate of the terminal device parsing RAR and reduce the access delay of the terminal device. The implementation method will be briefly introduced below. The specific description of the implementation method can be found in the corresponding description of 9, which will not be repeated here.

[0154] The terminal device receives K RARs from the network device based on the number of L repetitions of random access response RAR transmission, where L is an integer greater than 1 and K is an integer greater than 0 and less than or equal to L. Correspondingly, the network device sends L RARs to the terminal device based on the number of L repetitions of random access response RAR transmission.

[0155] Based on this implementation, the terminal device can receive up to L RARs at a time, and the terminal device parses the received RARs. The more RARs received, the more likely it is to successfully parse the RARs. Improving the probability of successfully parsing the RARs is beneficial to reducing the random access delay of the terminal device.

[0156] Optionally, the number of RAR repetition transmissions L is related to the number of SSB repetition transmissions S in the same SSB cycle.

[0157] Optionally, the L RARs belong to the first type of RAR, and at least one SIB among the P SIBs indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR. Further optionally, the number of repeated transmissions of the first type of RAR is related to the coverage area corresponding to the first type of RAR, and the number of repeated transmissions of the second type of RAR is related to the coverage area corresponding to the second type of RAR.

[0158] In one possible implementation, before receiving the RAR, the terminal device needs to determine the time-frequency resources that carry the RAR through downlink control information (DCI). When the terminal device is located in an area with poor transmission quality, the terminal device has a low success rate in parsing the DCI, but the terminal device needs to parse the DCI to determine the time-frequency resources where the RAR is located. The network device can also use the method of repeatedly sending DCI to improve the success rate of the terminal device in parsing the DCI and reduce the access delay of the terminal device. The implementation method is briefly introduced below. For a detailed description of the implementation method, please refer to Fig.10The corresponding description will not be repeated here.

[0159] The terminal device receives at most Y DCIs from the network device based on the number of DCI repetitions X, where at least one DCI among the Y DCIs indicates the time-frequency resources of at least one RAR among the K RARs, and the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, where X is an integer greater than 1, and Y is an integer greater than 0 and less than or equal to X. Correspondingly, the network device sends X DCIs to the terminal device based on the number of DCI repetitions X.

[0160] Based on this implementation, the terminal device can receive up to Y DCIs at a time, and the terminal device parses the received DCIs. The more DCIs received, the more likely it is to successfully parse the DCIs. Increasing the probability of successfully parsing the DCIs is beneficial to reducing the random access delay of the terminal device.

[0161] Optionally, X is equal to L, there is a one-to-one correspondence between the X DCIs and the L RARs, and one DCI among the X DCIs indicates the time-frequency resources of the RAR corresponding thereto.

[0162] Optionally, at least one DCI among the X DCIs indicates the time-frequency resources of each RAR among the L RARs.

[0163] When initiating random access, the terminal device needs to receive a RAR sent from the network, where RAR may refer to Msg2 in four-step random access or MsgB in two-step random access. For details about two-step random access and four-step random access, see Figure 2 and Figure 3 When the terminal device is located in an area with poor transmission quality, the success rate of the terminal device parsing RAR is low, but the terminal device needs to parse RAR to complete random access. How to ensure that the terminal device completes random access stably and reduce access delay is an urgent problem to be solved.

[0164] In order to reduce the delay of random access of terminal devices, this application proposes a communication method, see Fig. 9 . Fig. 9 is a flow chart of a communication method provided in an embodiment of the present application. Fig. 9 As shown, the communication method includes the following steps 901 and 902. Fig. 9 The method shown may be executed by a terminal device and a network device, or may be executed by a chip in the terminal device and a chip in the network device. Figure 3 The terminal device and the network device are used as the execution subject of the method for illustration. The embodiment of the present application does not limit the execution subject of the communication method. The terminal device and the network device can be Figure 1The terminal equipment and network equipment shown in the figure. Among them:

[0165] 901. The network device sends L RARs to the terminal device based on the number of L RAR repetitions.

[0166] 902. The terminal device receives K RARs from the network device.

[0167] In an embodiment of the present application, before step 901, the terminal device sends a random access request to the network device, and the random access request may be Msg1 in a four-step random access or MsgA in a two-step random access. The number of repeated RAR transmissions L refers to the number of RARs sent by the network device in response to the random access request sent by the terminal device. It can be understood that each of the L RARs sent by the network device is for the random access request sent by the terminal device, and L is an integer greater than 1. The K RARs received by the terminal device all belong to the L RARs sent by the network device, that is, K is an integer less than or equal to L and greater than 0.

[0168] Based on the method described in the embodiment of the present application, the terminal device can receive up to L RARs at a time, and the terminal device parses the received RARs. The more RARs received, the more likely it is to successfully parse the RARs. Improving the probability of successfully parsing the RARs is beneficial to reducing the random access delay of the terminal device.

[0169] In one possible implementation, the terminal device may attempt to parse the RAR multiple times. For example, after sending a random access request, each time the terminal device receives a RAR, it may perform a combined analysis based on all the currently received RARs. Among them, the number of RARs received by the terminal device within one RAR cycle does not exceed the maximum number of RAR repeated receptions Z, where Z is an integer greater than 1. Optionally, the number of RAR repeated transmissions L is equal to the maximum number of RAR repeated receptions Z, and the terminal device may obtain the number of RAR repeated transmissions L through a network device. Optionally, the RAR maximum number of repeated receptions Z can be determined based on a first parameter, and the specific implementation method in which the terminal device determines the RAR maximum number of repeated receptions Z based on the first parameter is the same as step 501, and the embodiments of the present application are not described in detail here.

[0170] Exemplarily, assuming that Z is equal to 3, after the terminal device sends a random access request, the terminal device receives 1 RAR. If the terminal device successfully parses based on 1 RAR, the terminal device does not need to continue to receive RAR. If the terminal device fails to parse based on 1 RAR, the terminal device receives the next RAR, and then merges and parses the two RARs. If the parsing is successful, the terminal device does not need to continue to receive RAR. If the reception fails, the terminal device continues to receive the next RAR in the same way. That is, the terminal device can try to parse RAR three times, respectively, parsing the received 1 RAR, parsing the received 2 RARs, and parsing the received 3 RARs.

[0171] When the number of RARs received by the terminal device after sending the random access request is equal to Z, and the terminal device fails to merge and parse the L RARs, the terminal device will no longer continue to receive RARs, but will try to resend a new RAR.

[0172] In a possible implementation, the number of repeated RAR transmissions L is related to the number of repeated SSB transmissions S in the same SSB cycle. The L RARs sent by the network device to the terminal device are associated with the S SSBs sent by the network device, where the S SSBs are SSBs sent by the network device in the same SSB cycle. The specific implementation of the network device sending the S SSBs can be found in the above Figure 5 In this implementation, the network device may not need to send signaling to indicate the number of repeated transmissions L of the RAR to the terminal device. The terminal device may determine the number of repeated transmissions L of the RAR by the number of repeated transmissions S of the SSB in the same SSB cycle, which is conducive to saving signaling overhead.

[0173] The L RARs sent by the network device to the terminal device are associated with the S SSBs sent by the network device, which means that the L RARs are the same as the beam direction or the corresponding coverage area corresponding to the S SSBs, and the number of repeated transmissions L of the RAR is related to the number of repeated transmissions S of the SSB in the same SSB cycle. It can be understood that the network device sends S SSBs, the terminal device is located in the coverage area corresponding to the S SSBs, the terminal device obtains the SIB through the S SSBs, and sends a random access request to the network device. Correspondingly, the network device sends L RARs according to the area where the terminal device that sent the random access request is located. Since the terminal device is located in the coverage area corresponding to the S SSBs, the coverage area corresponding to the L RARs sent by the network device is the same as the coverage area where the S SSBs are located. Among them, the association relationship between SSB and SIB can be seen in Figure 8 The corresponding description will not be repeated here.

[0174] The number of repeated transmissions L of the RAR is related to the number of repeated transmissions S of the SSB in the same SSB cycle, which means that the number of repeated transmissions L of the RAR can be determined based on the number of repeated transmissions S of the SSB in the same SSB cycle. Optionally, the corresponding relationship between the number of repeated transmissions L of the RAR and the number of repeated transmissions S of the SSB in the same SSB cycle can be preset, and the terminal device can determine the number of repeated transmissions L of the RAR according to the relationship after obtaining the number of repeated transmissions S of the SSB in the same SSB cycle. For example, the network device can pre-configure the corresponding relationship between the number of repeated transmissions L of the RAR in the same RAR cycle and the number of repeated transmissions S of the SSB in the same SSB cycle as shown in the following table 2:

[0175] Table 2

[0176] The number of SSB repetitions in the same SSB cycle S The number of repeated transmissions of RAR in the same RAR cycle is L 8 4 6 3 4 2

[0177] When the terminal device determines that the number of SSB repetitions S in the same SSB cycle is 6 based on the coverage area corresponding to the SSB beam, the terminal device can determine through Table 2 that the number of RAR repetitions L in the same RAR cycle corresponding to the RAR associated with the SSB is 3.

[0178] It should also be noted that the above example shows the correspondence between the number of repeated transmissions L of RAR and the number of repeated transmissions S of SSB in the same SSB cycle in the form of a table. The correspondence between the two can also be defined in other ways, such as by a function, for example, the relationship between L and S is defined as L=S+1 or L=2S or L=S / 2, etc.

[0179] For another example, the number of repeated transmissions L of the RAR is equal to the number of repeated transmissions S of the SSB in the same SSB cycle. For example, assuming that the number of repeated transmissions of the SSB in the same SSB cycle is 3 times, the number of repeated transmissions of the RAR is 3 times. The embodiment of the present application does not limit how to define the corresponding relationship between the number of repeated transmissions L of the RAR and the number of repeated transmissions S of the SSB in the same SSB cycle.

[0180] In a possible implementation, at least one SIB among the P SIBs sent by the network device indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR. Among them, the L RARs sent by the network device belong to the first type of RAR. Correspondingly, at least one SIB among the Q SIBs received by the terminal device indicates the number of repeated transmissions of the first type of RAR and the number of repeated transmissions of the second type of RAR. The K RARs received by the terminal device belong to the first type of RAR. Optionally, further optionally, each of the S SSBs carries the number of repeated transmissions S of the SSB in the same SSB cycle. For the terminal device side, each of the N SSBs received by the terminal device carries the number of repeated transmissions of the SSB in the same SSB cycle. Based on this method, the terminal device can obtain the number of repeated transmissions of the SSB in the same SSB cycle through the SSB, thereby determining the number of repeated transmissions of the SIB in the same SIB cycle.

[0181] The main difference between the first type RAR and the second type RAR is that the coverage area corresponding to the beam used to send the first type RAR is different from the coverage area corresponding to the beam used to send the second type RAR.

[0182] Among them, the network device will receive the random access request sent by the terminal device, and the network device will determine the type of RAR corresponding to the area to be replied according to the area where the terminal device sending the random access request is located. Exemplarily, it is assumed that the coverage area corresponding to the first type of RAR is area 1, the coverage area corresponding to the second type of RAR is area 2, the number of repeated transmissions corresponding to the first type of RAR is 2 times, and the number of repeated transmissions of the second type of RAR is 3 times. Assuming that the terminal device is located in area 1 and sends a random access request to the network device, the network device determines that the first type of RAR should be sent according to the area corresponding to the random access request, so the network device will send 2 RARs in the direction of area 1.

[0183] This implementation method takes the example that the network device can send the first type RAR and the second type RAR. The number of repeated transmissions of the first type RAR is related to the coverage area corresponding to the first type RAR, and the number of repeated transmissions of the second type RAR is related to the coverage area corresponding to the second type RAR. Among them, the distance between the coverage area corresponding to the second type RAR and the network device is farther than the distance between the coverage area corresponding to the first type RAR and the network device. The coverage area corresponding to the first type RAR is relatively close to the location of the network device. For example, in the sub-satellite area of ​​the coverage area corresponding to the first type SSB, the network device can determine that the number of repeated transmissions of the first type RAR is the first value; the coverage area corresponding to the second type RAR is relatively far from the location of the network device. For example, the coverage area corresponding to the second type RAR is located in the edge area. The network device can determine that the number of repeated transmissions of the first type RAR is the second value, wherein the second value is greater than the first value.

[0184] It can be understood that the coverage area corresponding to the first type of RAR is relatively close to the location of the network device, and the current communication quality of the terminal device in the coverage area corresponding to the first type of RAR is relatively good. In this case, the number of repeated transmissions of the first type of RAR is small, which is conducive to saving transmission resources. The coverage area corresponding to the second type of RAR is relatively far from the location of the network device, and the current communication quality of the terminal device in the coverage area corresponding to the second type of RAR is relatively poor. In this case, the maximum number of repeated receptions of the second type of RAR is large, which is conducive to making the terminal device receive RAR more times and increasing the probability of the terminal device successfully parsing RAR.

[0185] It should also be noted that, in the above implementation, the network device sends two types of RARs (first type RAR and second type RAR) as an example. In the embodiment of the present application, the network device can also send more types of RARs. For example, the network device can also send third type RARs, fourth type RARs, etc., which are not limited in the embodiment of the present application. In addition, the above examples all use different numbers of repeated transmissions of the first type RAR and the second type RAR as examples, wherein the number of repeated transmissions of the first type RAR and the second type RAR can also be the same. It can be understood that the repeated transmissions of different types of RARs can be the same or different.

[0186] In one possible implementation, before receiving the RAR, the terminal device needs to determine the time-frequency resources that carry the RAR through downlink control information (DCI). When the terminal device is located in an area with poor transmission quality, the terminal device has a low success rate in parsing the DCI, but the terminal device needs to parse the DCI to determine the time-frequency resources where the RAR is located. The network device can also use the method of repeatedly sending DCI to improve the success rate of the terminal device in parsing the DCI and reduce the access delay of the terminal device. The implementation method is briefly introduced below. For a detailed description of the implementation method, please refer to Fig.10 The corresponding description will not be repeated here.

[0187] The terminal device receives at most Y DCIs from the network device based on the number of DCI repetitions X, where at least one DCI among the Y DCIs indicates the time-frequency resources of at least one RAR among the K RARs, and the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, where X is an integer greater than 1, and Y is an integer greater than 0 and less than or equal to X. Correspondingly, the network device sends X DCIs to the terminal device based on the number of DCI repetitions X.

[0188] Based on this implementation, the terminal device can receive up to Y DCIs at a time, and the terminal device parses the received DCIs. The more DCIs received, the more likely it is to successfully parse the DCIs. Increasing the probability of successfully parsing the DCIs is beneficial to reducing the random access delay of the terminal device.

[0189] Optionally, X is equal to L, there is a one-to-one correspondence between the X DCIs and the L RARs, and one DCI among the X DCIs indicates the time-frequency resources of the RAR corresponding thereto.

[0190] Optionally, at least one DCI among the X DCIs indicates the time-frequency resources of each RAR among the L RARs.

[0191] When initiating random access, the terminal device needs to receive a RAR from the network device, where the RAR may refer to Msg2 in four-step random access or MsgB in two-step random access. For more information about two-step random access and four-step random access, see Figure 2 and Figure 3 Before receiving RAR, the terminal device needs to determine the time-frequency resources carrying RAR through DCI. When the terminal device is located in an area with poor transmission quality, the success rate of the terminal device parsing DCI is low, but the terminal device needs to parse DCI to determine the time-frequency resources where the RAR is located. How to ensure that the terminal device can stably complete random access and reduce access delay is a problem that needs to be solved urgently.

[0192] In order to reduce the delay of random access of terminal devices, this application proposes a communication method, see Fig.10 . Fig.10 is a flow chart of a communication method provided in an embodiment of the present application. Fig.10 As shown, the communication method includes the following steps 1001 and 1002. Fig.10 The method shown may be executed by a terminal device and a network device, or may be executed by a chip in the terminal device and a chip in the network device. Figure 3 The terminal device and the network device are used as the execution subject of the method for illustration. The embodiment of the present application does not limit the execution subject of the communication method. The terminal device and the network device can be Figure 1 The terminal equipment and network equipment shown in the figure. Among them:

[0193] 1001. The network device sends X DCIs to the terminal device based on the number of DCI repetitions X.

[0194] 1002. The terminal device receives Y DCIs from the network device.

[0195] In an embodiment of the present application, before step 901, the terminal device sends a random access request to the network device, and the random access request can be Msg1 in the four-step random access or MsgA in the two-step random access. For the random access request sent by the terminal device, the network device needs to reply RAR accordingly. Before sending RAR, the network device needs to indicate the time-frequency resources of RAR through DCI.

[0196] Among them, the number of DCI repetitions X refers to the number of DCIs of RAR sent by the network device for scheduling the random access request of the terminal device. It can be understood that the network device will send X DCIs of RAR corresponding to the random access request of the terminal device to the terminal device. Exemplarily, after the terminal device sends a random access request to the network device, the network device replies to the RAR for the random access request. Before replying to the RAR, the network device will send X DCIs to the terminal device, and the X DCIs are used to schedule the RAR, and X is an integer greater than 1. The Y DCIs received by the terminal device all belong to the X RARs sent by the network device, that is, Y is an integer less than or equal to X and greater than 0.

[0197] Based on the method described in the embodiment of the present application, the terminal device can receive up to Y DCIs at a time, and the terminal device parses the received DCIs. The more DCIs received, the more likely it is to successfully parse the DCIs. Improving the probability of successfully parsing the DCIs is beneficial to reducing the delay of random access of the terminal device.

[0198] In one possible implementation, the terminal device may attempt to parse the DCI multiple times. For example, after sending a random access request, each time the terminal device receives a DCI, it may combine and parse based on all the currently received DCIs. Among them, the number of DCIs received by the terminal device in one DCI cycle does not exceed the maximum number of repeated receptions of DCI T, where T is an integer greater than 1. Optionally, the number of repeated DCI transmissions L is equal to the maximum number of repeated receptions of DCI T, and the terminal device may obtain the number of repeated DCI transmissions L through a network device. Optionally, the maximum number of repeated receptions T of the DCI can be determined based on a first parameter, and the specific implementation method in which the terminal device determines the maximum number of repeated receptions T of the DCI based on the first parameter is the same as step 501, and the embodiments of the present application are not described in detail here.

[0199] Exemplarily, assuming that T is equal to 3, after the terminal device sends a random access request, the terminal device receives 1 DCI. If the terminal device successfully parses based on 1 DCI, the terminal device does not need to continue to receive DCI. If the terminal device fails to parse based on 1 DCI, the terminal device receives the next DCI, and then merges and parses the two DCIs. If the parsing is successful, the terminal device does not need to continue to receive DCI. If the reception fails, the terminal device continues to receive the next DCI in the same way. That is, the terminal device can try to parse the DCI 3 times, respectively parsing the 1 received DCI, parsing the 2 received DCIs, and parsing the 3 received DCIs.

[0200] When the number of DCIs received by the terminal device after sending a random access request is equal to T, and the terminal device fails to parse the L DCIs, the terminal device will no longer continue to receive DCIs, but will try to resend new DCIs.

[0201] In a possible implementation, the number of DCI repetitions X is related to the number of SSB repetitions S in the same SSB period. The X DCIs sent by the network device are associated with the S SSBs sent by the network device. The specific implementation of the network device sending the S SSBs can be found in the above Figure 5 The description in the corresponding embodiment.

[0202] The X DCIs sent by the network device to the terminal device are associated with the S SSBs sent by the network device, which means that the physical random access channel transmission opportunity (RO) resource carried by the random access request message corresponding to the RAR scheduled by the X DCI has a mapping relationship with at least one SSB among the S SSBs. Exemplarily, the network device sends S SSBs, and the coverage area corresponding to the S SSBs is area 1. After the terminal device located in area 1 receives at least one SSB among the S SSBs, it determines the RO resource based on the SSB and sends a random access request to the network device on the RO resource. After receiving the random access request from the terminal device, the network device needs to reply to the terminal device with the RAR corresponding to the random access request, and needs to send X DCIs before sending the RAR, and the X DCIs are used to schedule the RAR.

[0203] The number of repeated DCI transmissions X is related to the number of repeated SSB transmissions S in the same SSB cycle, which means that the number of repeated DCI transmissions X can be determined based on the number of repeated SSB transmissions S in the same SSB cycle. Optionally, the correspondence between the number of repeated DCI transmissions X and the number of repeated SSB transmissions S in the same SSB cycle can be preset, and the terminal device can determine the number of repeated DCI transmissions X according to the relationship after obtaining the number of repeated SSB transmissions S in the same SSB cycle. For example, the network device can pre-configure the correspondence between the number of repeated DCI transmissions X in the same DCI cycle and the number of repeated SSB transmissions S in the same SSB cycle as shown in Table 3 below:

[0204] Table 3

[0205] The number of SSB repetitions in the same SSB cycle S The number of DCI retransmissions in the same DCI cycle is X 8 4 6 3 4 2

[0206] When the terminal device determines that the number of SSB repetitions S in the same SSB cycle is 4 based on the coverage area corresponding to the SSB beam, the terminal device can determine through Table 3 that the number of DCI repetitions X in the same DCI cycle corresponding to the DCI associated with the SSB is 2.

[0207] It should also be noted that the above example shows the correspondence between the number of DCI repeated transmissions X and the number of SSB repeated transmissions S in the same SSB cycle in the form of a table. The correspondence between the two can also be defined in other ways, such as by a function, for example, the relationship between X and S is defined as X=S+1 or X=2S or X=S / 2, etc.

[0208] For another example, the number of repeated transmissions X of the DCI is equal to the number of repeated transmissions S of the SSB in the same SSB cycle. For example, assuming that the number of repeated transmissions of the SSB in the same SSB cycle is 3 times, the number of repeated transmissions of the DCI is 3 times. The embodiment of the present application does not limit how to define the corresponding relationship between the number of repeated transmissions X of the DCI and the number of repeated transmissions S of the SSB in the same SSB cycle.

[0209] In a possible implementation, the network device sends L RARs to the terminal device, and correspondingly, the terminal device receives K RARs from the network device. Among them, at least one DCI in the X DCIs indicates the time-frequency resource of at least one RAR in the L RARs. For the specific implementation of the network device sending L RARs to the terminal device, please refer to the above Fig. 9 The corresponding description.

[0210] Optionally, X is equal to L, and there is a one-to-one correspondence between X DCIs and L RARs, and one DCI among the X DCIs indicates the time-frequency resources of the corresponding RAR. In the method, after sending a random access request, the terminal device obtains the RAR corresponding to the DCI based on the DCI for each DCI received, and combines the currently received RAR with the previously received RAR for the random access request for parsing. If the RAR is parsed successfully, the terminal device will not need to receive DCI and RAR; if the RAR parsing fails, the DCI will continue to be received. Until the number of received DCIs is X, if the terminal device still fails to parse the RAR after receiving X RARs, the terminal device will resend a new random access request.

[0211] For example, Fig.11 As shown, assuming that X is 3, the network device will send 3 DCIs to the terminal device, namely DCI1, DCI2 and DCI3. X is equal to L, so the network device will send 3 RARs to the terminal device, namely RAR1, RAR2 and RAR3, where there is a one-to-one correspondence between DCI and RAR, that is, DCI1 schedules RAR1, DCI2 schedules RAR2, and DCI3 schedules RAR3. After the terminal device receives DCI1, it receives RAR1 based on DCI1. If the parsing of RAR1 is successful, it will no longer receive subsequent DCI and RAR. If the parsing of RAR1 fails, it will continue to receive DCI2, receive RAR2 based on DCI2, and merge and parse RAR1 and RAR2. If the parsing is successful, it will no longer receive subsequent DCI and RAR. If the parsing fails, it will continue to receive DCI3, receive RAR3 based on DCI3, and merge and parse RAR1, RAR2 and RAR3.

[0212] Optionally, at least one DCI in the X DCIs indicates the time-frequency resources of each RAR in the L RARs. Further optionally, each DCI in the X DCIs indicates the time-frequency resources of each RAR in the L RARs. Based on this implementation, after successfully parsing the DCI, the terminal device can know the time-frequency resources of each RAR in the L RARs sent by the network device, and the terminal device does not need to continue to parse the DCI, which is conducive to reducing the processing burden of the terminal device.

[0213] In order to implement the functions of the method provided in the above embodiment of the present application, the terminal device and the terminal device may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0214] See also Fig.12 , Fig.12 A schematic structural diagram of a communication device according to an embodiment of the present application is shown. Fig.12 The communication device shown may be a terminal device, or a device in the terminal device, or a device that can be used in conjunction with the terminal device; or Fig.12 The communication device shown may be a network device, or a device in a network device, or a device that can be used in conjunction with a network device. Fig.12 The communication device shown may include a communication unit 1201 and a processing unit 1202 .

[0215] Specifically, the communication unit 1201 is used to perform the sending or receiving function of the terminal device or network device in the above method embodiment. The processing unit 1202 is used to perform the data processing function of the terminal device or network device in the above method embodiment. For other possible implementations of the communication device, please refer to the above Figure 5 , Figure 8 , Fig. 9 or Fig.10 The relevant description of the functions of the terminal device or network device in the corresponding method embodiment will not be repeated here.

[0216] Fig.13 A schematic diagram of the structure of a communication device is provided. The communication device 1300 may be a terminal device in the above method embodiment, or may be a chip, a chip system, or a processor that supports the terminal device to implement the above method. The communication device may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

[0217] Alternatively, the communication device 1300 may be a network device in the above method embodiment, or a chip, chip system, or processor that supports the network device to implement the above method. The communication device may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

[0218] The communication device 1300 may include one or more processors 1301. The processor 1301 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal, a terminal chip, a DU or a CU, etc.), execute a software program, and process the data of the software program.

[0219] Optionally, the communication device 1300 may include one or more memories 1302, on which instructions 1304 may be stored, and the instructions may be executed on the processor 1301, so that the communication device 1300 performs the method described in the above method embodiment. Optionally, data may also be stored in the memory 1302. The processor 1301 and the memory 1302 may be provided separately or integrated together.

[0220] Optionally, the communication device 1300 may further include a transceiver 1305 and an antenna 1306. The transceiver 1305 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function. The transceiver 1305 may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.

[0221] The communication device 1300 is a terminal device: the processor 1301 is used to perform the data processing operation of the terminal device in the above method embodiment. The transceiver 1305 is used to perform the data transceiving operation of the terminal device in the above method embodiment.

[0222] Alternatively, the communication device 1300 is a network device: the processor 1301 is used to perform the data processing operation of the network device in the above method embodiment. The transceiver 1305 is used to perform the data transceiving operation of the network device in the above method embodiment.

[0223] In another possible design, the processor 1301 may include a transceiver for implementing the receiving and sending functions. For example, the transceiver may be a transceiver circuit, or an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated. The above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.

[0224] In another possible design, optionally, the processor 1301 may store an instruction 1303, and the instruction 1303 runs on the processor 1301, so that the communication device 1300 can perform the method described in the above method embodiment. The instruction 1303 may be solidified in the processor 1301, in which case the processor 1301 may be implemented by hardware.

[0225] In another possible design, the communication device 1300 may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiments. The processor and transceiver described in the embodiments of the present application can be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc.

[0226] The communication device described in the above embodiments may be a terminal device or a network device, but the scope of the communication device described in the embodiments of the present application is not limited thereto, and the structure of the communication device may not be limited thereto. Fig.13 The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0227] (1) Independent integrated circuit IC, or chip, or chip system or subsystem;

[0228] (2) having a set of one or more ICs, and optionally, the IC set may also include a storage component for storing data and instructions;

[0229] (3) ASIC, such as modem (Mobile Station Modem, MSM);

[0230] (4) Modules that can be embedded in other devices;

[0231] (5) Receivers, terminals, smart terminals, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

[0232] (6)Others

[0233] For the case where the communication device may be a chip or a chip system, see Fig.14 Schematic diagram of the chip structure shown. Fig.14 The chip shown includes a processor 1401 and an interface 1402. Optionally, it may also include a memory 1403. The number of the processor 1401 may be one or more, and the number of the interface 1402 may be multiple.

[0234] In one design, for a case where a chip is used to implement the functions of a terminal device in an embodiment of the present application:

[0235] The interface 1402 is used to input or output signals;

[0236] The processor 1401 is used to execute the data processing operation of the terminal device in the above method embodiment.

[0237] In another design, for the case where the chip is used to implement the function of the network device in the embodiment of the present application:

[0238] The interface 1402 is used to input or output signals;

[0239] The processor 1401 is used to execute the data processing operation of the network device in the above method embodiment.

[0240] It is understandable that some optional features in the embodiments of the present application may be implemented independently in certain scenarios without relying on other features, such as the solution on which they are currently based, to solve corresponding technical problems and achieve corresponding effects, or may be combined with other features according to needs in certain scenarios. Accordingly, the communication device provided in the embodiments of the present application may also implement these features or functions accordingly, which will not be described in detail here.

[0241] It should be understood that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an ASIC, a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0242] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0243] The present application also provides a computer-readable medium for storing computer software instructions, which, when executed by a communication device, implement the functions of any of the above method embodiments.

[0244] The present application also provides a computer program product for storing computer software instructions, which, when executed by a communication device, implement the functions of any of the above method embodiments.

[0245] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, 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 site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state drive (SSD)).

[0246] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

Claims

1. A communication method, characterized in that: The method comprises: Determine a maximum number of repeated receptions of a synchronization signal block SSB based on a first parameter, where M is an integer greater than 1, and the first parameter is one or more of a reference signal received power RSRP, a reference signal received quality RSRQ, or a received signal strength indication RSSI; Based on the maximum number of repeated reception times M of the SSB, N SSBs are received from the network device, where the N SSBs are located in the same SSB cycle, and N is an integer greater than 0 and less than or equal to M.

2. The method according to claim 1, characterized in that At least one SSB among the N SSBs carries the number of SSB repetitions S within the same SSB cycle, where S is an integer greater than 1.

3. The method according to claim 2, characterized in that The MIB included in at least one SSB among the N SSBs carries the number of SSB repetitions within the same SSB cycle.

4. The method according to claim 2 or 3, characterized in that: The number of SSB repeated transmissions S within the same SSB cycle is equal to the maximum number of SSB repeated receptions M.

5. The method according to any one of claims 2 to 4, characterized in that: The method further comprises: Based on the number of SIB repetitions P within the same system message block SIB period, Q SIBs are received from a network device, wherein the number of SIB repetitions P within the same SIB period is related to the number of SSB repetitions S within the same SSB period, the Q SIBs are located in the same SIB period, the Q SIBs are associated with the N SSBs, P is an integer greater than 1, and Q is an integer greater than 0 and less than or equal to P.

6. The method according to claim 5, characterized in that The number of SIB repetitions P within the same SIB period is equal to the number of SSB repetitions S within the same SSB period.

7. The method according to claim 5 or 6, characterized in that: The N SSBs belong to a first type of SSBs, and at least one SIB among the Q SIBs indicates the number of repeated transmissions of the first type of SSBs and the number of repeated transmissions of the second type of SSBs.

8. The method according to claim 7, characterized in that The number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB.

9. The method according to any one of claims 5 to 7, characterized in that: The method is applied in a random access process, and the method further includes: Based on the number of repeated transmissions of the random access response RAR L, K RARs are received from the network device, where L is an integer greater than 1, and K is an integer greater than 0 and less than or equal to L.

10. The method according to claim 9, characterized in that The number of RAR repetition transmissions L is related to the number of SSB repetition transmissions S in the same SSB cycle.

11. The method according to claim 9, characterized in that The K RARs belong to a first type of RAR, and at least one SIB among the Q SIBs indicates a number of repeated transmissions of the first type of RAR and a number of repeated transmissions of the second type of RAR.

12. The method according to claim 11, characterized in that The number of repeated transmissions of the first type RAR is related to the coverage area corresponding to the first type RAR, and the number of repeated transmissions of the second type RAR is related to the coverage area corresponding to the second type RAR.

13. The method according to any one of claims 9 to 12, characterized in that: The method further comprises: Based on the number of DCI repetitions X, at most Y DCIs are received from the network device, at least one of the Y DCIs indicates the time-frequency resources of at least one RAR among the K RARs, the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, X is an integer greater than 1, and Y is an integer greater than 0 and less than or equal to X.

14. The method according to claim 13, characterized in that The Y is equal to the K, the Y DCIs correspond to the K RARs in one-to-one correspondence, and one DCI among the Y DCIs indicates the time-frequency resources of the corresponding RAR.

15. The method according to claim 13, characterized in that At least one DCI among the Y DCIs indicates the time-frequency resources of each RAR among the K RARs.

16. A communication method, characterized in that: The method comprises: Based on the number of S SSB repetitions within the SSB period of the same synchronization signal block, S SSBs are sent, and the S SSBs are located in the same SSB period, and S is an integer greater than 1.

17. The method according to claim 16, characterized in that At least one of the S SSBs carries the number of SSB repetitions within the same SSB cycle.

18. The method according to claim 17, characterized in that The MIB included in at least one SSB among the N SSBs carries the number of SSB repetitions within the same SSB cycle.

19. The method according to any one of claims 16 to 18, characterized in that: The method further comprises: Based on the number of SIB repetitions P within the same system message block SIB period, P SIBs are sent, the number of SIB repetitions P within the same SIB period is related to the number of SSB repetitions S within the same SSB period, the P SIBs are associated with the S SSBs, and P is an integer greater than 1.

20. The method according to claim 19, characterized in that The number of repeated transmissions P of the SIB in the same SIB period is equal to the number of repeated transmissions S of the SSB in the same SSB period.

21. The method according to claim 19 or 20, characterized in that The S SSBs belong to a first type of SSBs, and at least one SIB among the P SIBs indicates the number of repeated transmissions of the first type of SSBs and the number of repeated transmissions of the second type of SSBs.

22. The method according to claim 21, characterized in that The number of repeated transmissions of the first type of SSB is related to the coverage area corresponding to the first type of SSB, and the number of repeated transmissions of the second type of SSB is related to the coverage area corresponding to the second type of SSB.

23. The method according to any one of claims 19 to 22, characterized in that: The method is applied in a random access process, and the method further includes: Based on the number of repetitions L of random access responses RAR, L RARs are sent to the terminal device, where L is an integer greater than 1.

24. The method according to claim 23, characterized in that The number of RAR repetition transmissions L is related to the number of SSB repetition transmissions S in the same SSB cycle.

25. The method according to claim 23, characterized in that The L RARs belong to a first type of RAR, and at least one SIB among the P SIBs indicates a number of repeated transmissions of the first type of RAR and a number of repeated transmissions of the second type of RAR.

26. The method according to claim 25, characterized in that The number of repeated transmissions of the first type RAR is related to the coverage area corresponding to the first type RAR, and the number of repeated transmissions of the second type RAR is related to the coverage area corresponding to the second type RAR.

27. The method according to any one of claims 23 to 26, characterized in that: The method further comprises: Based on the number of DCI repetitions X, X DCIs are sent to the terminal device, at least one of the X DCIs indicates the time-frequency resources of at least one RAR among the L RARs, the number of DCI repetitions is related to the number of SSB repetitions S in the same SSB period, and X is an integer greater than 1.

28. The method according to claim 27, characterized in that The X is equal to the L, the X DCIs correspond to the L RARs in one-to-one correspondence, and one DCI among the X DCIs indicates the time-frequency resources of the corresponding RAR.

29. The method according to claim 27, characterized in that At least one DCI among the X DCIs indicates the time-frequency resources of each RAR among the L RARs.

30. A communication device, characterized in that: The communication device includes a unit for executing the method according to any one of claims 1 to 15, or the communication device includes a unit for executing the method according to any one of claims 16 to 29.

31. A communication device, characterized in that: The method comprises a processor, wherein the processor is used to execute a computer program or instruction stored in a memory to implement the method according to any one of claims 1 to 15, or to implement the method according to any one of claims 16 to 29.

32. A communication device, characterized in that: It includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method as described in any one of claims 1 to 15 through a logic circuit or an execution instruction, or the processor is used to implement the method as described in any one of claims 16 to 29 through a logic circuit or an execution instruction.

33. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 15 is executed, or the method according to any one of claims 16 to 29 is executed.

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