Communication method and related apparatus

Abstract

A communication method. The method comprises: receiving first information, wherein the first information is carried on a first beam; and determining a second beam on the basis of the first information, wherein the second beam is a narrow beam covered by the first beam, and the second beam is used for carrying a first signal, the first signal being used for a terminal device to perform random access. In this way, the terminal device learns, on the basis of the first information, that the narrow beam is to be sent in a subsequent time domain resource. The terminal device may measure the narrow beam, so as to acquire a channel measurement parameter of the narrow beam. The second beam is used for carrying a signal for random access, such that the terminal device can use the narrow beam for communication in advance in an initial access stage, thereby improving the communication performance of a link in the initial access stage.

Description

A communication method and related apparatus

[0001] This application claims priority to Chinese Patent Application No. 202510293109.7, filed with the State Intellectual Property Office of China on March 12, 2025, entitled "A Communication Method and Related Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and related apparatus. Background Technology

[0003] In non-terrestrial network (NTN) scenarios, satellites use wide-beam transmission of synchronization signal and PBCH blocks (SSBs), which reduces the number of positions within a given coverage area, thereby shortening the SSB scan time and reducing the latency for terminal network access. However, satellite communication suffers from high path loss, resulting in poor link budgets for multiple physical layer channels, which affects the quality of terminal communication.

[0004] During the initial access phase, using a narrow beam for data transmission can improve link performance and reduce the number of retransmissions due to poor signal quality. However, the problem is that in the initial access process of new radio (NR), the beam management strategy defaults to a fixed beamwidth and lacks an effective measurement and management mechanism for narrow beams, making it impossible to use narrow beams for channel measurements during the initial access process. Summary of the Invention

[0005] This application provides a communication method and related apparatus for improving communication performance.

[0006] The first aspect of this application provides a communication method applied to a first communication device. For example, the first communication device may be a communication equipment (such as a terminal device), or it may be a component of a communication equipment (such as a processor, circuit, chip, or chip system responsible for communication functions, including but not limited to a modem chip, a baseband chip, a system-on-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip, etc.). Alternatively, the first communication device may also be a logic module or software capable of implementing all or part of the functions of a communication equipment. The following description uses a first communication device as an example.

[0007] In this method, a first communication device receives first information, which is carried on a first beam; the first communication device determines a second beam based on the first information, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, and the first signal being used by a terminal device for random access.

[0008] When a terminal device enters the connected state, it needs to initiate a random access request to align uplink and downlink data links with the network device. In this application, both the first and second received beams originate from the network device, with the first beam being a wide beam and the second beam being a narrow beam. In other words, the second beam is within the coverage area of ​​the first beam.

[0009] Based on the above scheme, the first communication device (i.e., the terminal device) first receives the broadcast signal of the wide beam (i.e., the first beam) and learns that a narrow beam (the second beam) will be transmitted in the subsequent time domain resources. The terminal device can then measure this narrow beam to obtain its channel measurement parameters, so that it can utilize the channel of this narrow beam for communication in subsequent data transmission. The second beam is used to carry signals for random access, allowing the terminal device to use the narrow beam for communication in advance during the initial access phase, thereby improving the communication performance of the link during the initial access phase.

[0010] In one possible implementation, the method further includes:

[0011] Send a second message, which is used to indicate a second beam and includes information for random access.

[0012] By reporting the received second beam, the terminal device enables the network side to identify the terminal's location and use uplink and downlink narrow beams in subsequent access processes, thereby improving the link budget.

[0013] In one possible implementation, the first information is contained in system message block 1SIB1, and the first information includes resource identifiers of multiple channel state information reference signals (CSI-RS) and scrambling identifiers of each of the multiple CSI-RS.

[0014] The first signal is the first channel state information reference signal (CSI-RS);

[0015] Determining the second beam based on the first information includes: detecting the first CSI-RS based on the scrambling identifier of each CSI-RS to obtain the resource identifier of the second beam, wherein the first CSI-RS is one of a plurality of CSI-RSs.

[0016] In this application, the network device configures the specific parameters of the CSI-RS narrow beam in the downlink wide beam SIB1, instructing the terminal device to subsequently measure the corresponding CSI-RS narrow beam. Based on the network device's coverage requirements, M wide beams can be configured, each corresponding to a resource set for transmitting CSI-RS signals, enabling the UE to obtain channel state information. Within each wide beam's resource set, N narrow beams are further subdivided, each corresponding to a resource. To ensure the accuracy and interference resistance of the CSI-RS signal transmission, each narrow beam resource is scrambled. The scrambling identifier ID corresponds to the beam ID of the narrow beam.

[0017] Using the above method, the terminal device can identify and decode CSI-RS signals from different beams based on the scrambling ID to obtain the CSI-RS signal, i.e., the resource identifier corresponding to the second beam.

[0018] In one possible implementation, the second information includes one or more of the measurement results of the first CSI-RS, the resource identifier of the second beam, the identifier of the second beam, or the measurement report of the first CSI-RS.

[0019] In one possible implementation, the second information is contained within the first message, which is used to request random access, i.e., Msg1.

[0020] In one possible implementation, the first information further includes an orthogonal overlay code (OCC) sequence for each of the plurality of CSI-RSs, and the second information further includes a first repeating sequence generated based on the OCC sequence of the first CSI-RS.

[0021] When configuring CSI-RS, the network side can assign a unique OCC sequence to each CSI-RS. When the terminal sends uplink data, such as when sending a random access request Msg1, it embeds the OCC sequence information carried by the narrow-beam CSI-RS in the seq repetitions of each segment in the preamble. After receiving the information reported by the terminal, the network side uses the configured N OCC sequences to detect the received signal. By comparing the detection energy corresponding to different OCC sequences, the network side can determine the OCC sequence corresponding to the maximum detection energy. This OCC sequence represents the OCC corresponding to the narrow-beam CSI-RS received by the terminal device, thus allowing the network to infer that the area where the terminal device is located is roughly within the coverage area of ​​the narrow-beam CSI-RS.

[0022] In one possible implementation, the second information is contained in the second message, which is the response message of the random access response, namely Msg3.

[0023] In one possible implementation, the first information is contained in the synchronization message block SSB, and the first information includes first indication information, which is used to indicate multiple scrambling identifiers, each of the multiple scrambling identifiers corresponding to a narrow beam;

[0024] The first signal is the demodulation reference signal DMRS on the physical downlink control channel PDCCH;

[0025] The second beam is determined based on the first information, including:

[0026] According to the first indication information, the DMRS is detected by the first spatial parameters to obtain the channel characteristics of the second beam. The first spatial parameters are different from the spatial parameters of the SSB. The scrambling identifier of the DMRS is one of multiple scrambling identifiers.

[0027] For example, the first indication information is the bit information in the MIB / PBCH.

[0028] Using the above method, after the terminal obtains the configuration, when receiving PDCCH DMRS, it avoids using the same spatial Rx parameters as when receiving SSB. The terminal adds N-1 blind detection operations, where N is the number of narrow beams, to identify the narrow beams and their corresponding information. Therefore, the terminal device can use narrow beams for communication in advance during the initial access process, improving communication performance.

[0029] In one possible implementation, the method further includes: a first communication device modifying a first quasi-co-address relationship to a second quasi-co-address relationship, wherein the first quasi-co-address relationship is used to indicate that SSB, control resource set 0 CORESET0 and system message block 1 SIB1 are quasi-co-address relationships, and the second quasi-co-address relationship is used to indicate that CORESET0 and SIB1 are quasi-co-address relationships.

[0030] In one possible implementation, the method further includes: a first communication device receiving third information, the third information being used to indicate a first time-domain resource, the third information being carried on a third beam, and the third beam and the second beam having a quasi-co-address relationship;

[0031] Send a second message, including:

[0032] A first message is sent based on the first time domain resource. The first message includes second information and is used to request random access.

[0033] Before the terminal device sends the second information, the network device can send the third information to the terminal device. For example, the first time-domain resource can be a RACH resource, with each RACH resource corresponding to a narrow beam's scrambling identifier ID. Based on the received scrambling ID corresponding to the second beam, the terminal initiates a random access request on the corresponding RACH resource. After detecting the preamble of the second information, the network side can identify the RACH resource used by the terminal, and thus determine the narrow beam corresponding to the terminal. This allows the network device and the terminal device to communicate using the narrow beam in advance during the Msg2 phase, improving communication performance.

[0034] In one possible implementation, the method further includes:

[0035] Receive a first broadcast message, the first broadcast message including a first transmission configuration indication state TCI-state, the first transmission configuration indication state TCI-state is used to indicate a first reference signal or a second reference signal, the first reference signal corresponds to the channel information of a first beam, and the second reference signal corresponds to the channel information of a second beam.

[0036] In this application, after broadcasting the TCI-state, for example, broadcasting TCI-state1 as a narrow beam and TCI-state2 as a wide beam, the network device only needs to indicate the beam information to the terminal via DCI in subsequent downlink scheduling. By indicating the identifier (1 or 2) of a certain TCI-state, the terminal can be informed whether to use a wide beam or a narrow beam for data transmission, thereby realizing flexible switching and management of wide and narrow beams.

[0037] In one possible implementation, the first information is contained in the SSB, and the first information includes second indication information, which is used to indicate that CORESET0 and SIB1 are quasi-co-located, or to indicate that CORESET0, SIB1 and the DMRS of the random access response message are quasi-co-located;

[0038] The second beam is determined based on the second information, including:

[0039] Based on the second indication information, the second beam is detected by the first spatial parameters, which are different from the spatial parameters of the SSB.

[0040] For example, the second indication information is the bit information in the MIB / PBCH.

[0041] The network side directly indicates the QCL relationship between multiple downlink beams to the UE. Based on this indication, the terminal can use different spatial parameters to perform beam reception measurements, avoiding the terminal always defaulting to the quasi-co-address relationship between the downlink reference signal port and the SSB wide beam during the initial access process. In other words, it uses a narrow beam for communication in advance, improving communication performance.

[0042] In one possible implementation, the first signal includes third indication information, which is used to instruct the terminal device to receive the second beam on the first time domain resource.

[0043] After broadcasting the initial information using a wide beam, network devices then need to transmit multiple narrow beams within the wide beam's coverage area for more precise positioning of terminal devices. When network devices are limited in capacity and cannot simultaneously transmit multiple narrow beams downlink, time division multiplexing (TDM) can be used to round-robin the narrow beams. The third indication information is used to indicate the receiving location for the TDM round-robin transmission.

[0044] A second aspect of this application provides a communication method applied to a second communication device. For example, the second communication device may be a communication equipment (such as a network device), or it may be a component of a communication equipment (such as a processor, circuit, chip, or chip system responsible for communication functions, including but not limited to a modem chip, a baseband chip, a system-on-a-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip, etc.). Alternatively, the first communication device may also be a logic module or software capable of implementing all or part of the functions of the communication equipment. The following description uses a second communication device as an example.

[0045] In this method, a second communication device determines first information, which is carried on a first beam. This first information is used to determine a second beam, which is a narrow beam covered by the first beam. The second beam carries a first signal, which is used by the terminal device for random access. The second communication device then transmits the first information.

[0046] When a terminal device enters the connected state, it needs to initiate a random access request to align uplink and downlink data links with the network device. In this application, the terminal device receives a first beam and a second beam sent by the network device, wherein the first beam is a wide beam and the second beam is a narrow beam. In other words, the second beam is within the coverage area of ​​the first beam.

[0047] Based on the above scheme, the second communication device (i.e., the network device) first transmits a wide-beam (i.e., the first beam) broadcast signal, informing the terminal device that a narrow beam (the second beam) will be transmitted in the subsequent time-domain resources. While transmitting this narrow beam, the terminal device can measure it and obtain its channel measurement parameters, so that it can utilize the channel of this narrow beam for communication in subsequent data transmission. The second beam is used to carry signals for random access, allowing the terminal device to use the narrow beam for communication in advance during the initial access phase, thereby improving the communication performance of the link during the initial access phase.

[0048] In one possible implementation, the method further includes:

[0049] Receive second information, which is used to indicate the second beam, and includes information for random access.

[0050] By reporting the received second beam, the terminal device enables the network side to identify the terminal's location and use uplink and downlink narrow beams in subsequent access processes, thereby improving the link budget.

[0051] In one possible implementation, the first information is contained in system message block 1SIB1. The first information includes resource identifiers of multiple channel state information reference signals (CSI-RS) and scrambling identifiers of each of the multiple CSI-RS. The first signal is a first channel state information reference signal (CSI-RS), and the first CSI-RS is one of the multiple CSI-RS.

[0052] In one possible implementation, the second information includes one or more of the measurement results of the first CSI-RS, the resource identifier of the second beam, the identifier of the second beam, or the measurement report of the first CSI-RS.

[0053] In this application, the network device configures the specific parameters of the CSI-RS narrow beam in the downlink wide beam SIB1, instructing the terminal device to subsequently measure the corresponding CSI-RS narrow beam. Based on the network device's coverage requirements, M wide beams can be configured, each corresponding to a resource set for transmitting CSI-RS signals, enabling the UE to obtain channel state information. Within each wide beam's resource set, N narrow beams are further subdivided, each corresponding to a resource. To ensure the accuracy and interference resistance of the CSI-RS signal transmission, each narrow beam resource is scrambled. The scrambling identifier ID corresponds to the beam ID of the narrow beam.

[0054] Using the above method, the terminal device can identify and decode CSI-RS signals from different beams based on the scrambling ID to obtain the CSI-RS signal, i.e., the resource identifier corresponding to the second beam.

[0055] In one possible implementation, the second information is contained within the first message, which is used to request random access, i.e., Msg1.

[0056] In one possible implementation, the first information further includes an orthogonal overlay code (OCC) sequence for each of the plurality of CSI-RSs, and the second information further includes a first repeating sequence generated based on the OCC sequence of the first CSI-RS.

[0057] When configuring CSI-RS, the network side can assign a unique OCC sequence to each CSI-RS. When the terminal sends uplink data, such as when sending a random access request Msg1, it embeds the OCC sequence information carried by the narrow-beam CSI-RS in the seq repetitions of each segment in the preamble. After receiving the information reported by the terminal, the network side uses the configured N OCC sequences to detect the received signal. By comparing the detection energy corresponding to different OCC sequences, the network side can determine the OCC sequence corresponding to the maximum detection energy. This OCC sequence represents the OCC corresponding to the narrow-beam CSI-RS received by the terminal device, thus allowing the network to infer that the area where the terminal device is located is roughly within the coverage area of ​​the narrow-beam CSI-RS.

[0058] In one possible implementation, the second information is contained in the second message, which is the response message of the random access response, namely Msg3.

[0059] In one possible implementation, the first information is contained in the synchronization message block SSB. The first information includes first indication information, which is used to indicate multiple scrambling identifiers. Each of the multiple scrambling identifiers corresponds to a narrow beam. The first signal is the demodulation reference signal DMRS on the physical downlink control channel PDCCH. The scrambling identifier of the DMRS is one of the multiple scrambling identifiers.

[0060] For example, the first indication information is the bit information in the MIB / PBCH.

[0061] Using the above method, after the terminal obtains the configuration, when receiving PDCCH DMRS, it avoids using the same spatial Rx parameters as when receiving SSB. The terminal adds N-1 blind detection operations, where N is the number of narrow beams, to identify the narrow beams and their corresponding information. Therefore, the terminal device can use narrow beams for communication in advance during the initial access process, improving communication performance.

[0062] In one possible implementation, the method further includes:

[0063] The third information is sent to indicate the first time domain resource. The third information is carried on the third beam. The third beam and the second beam are quasi-co-located. The first time domain resource is used to instruct the terminal device to send the second information.

[0064] Before the terminal device sends the second information, the network device can send the third information to the terminal device. For example, the first time-domain resource can be a RACH resource, with each RACH resource corresponding to a narrow beam's scrambling identifier ID. Based on the received scrambling ID corresponding to the second beam, the terminal initiates a random access request on the corresponding RACH resource. After detecting the preamble of the second information, the network side can identify the RACH resource used by the terminal, and thus determine the narrow beam corresponding to the terminal. This allows the network device and the terminal device to communicate using the narrow beam in advance during the Msg2 phase, improving communication performance.

[0065] In one possible implementation, the method further includes:

[0066] Send a first broadcast message, which includes a first transmission configuration indication state (TCI-state). The first transmission configuration indication state (TCI-state) is used to indicate a first reference signal or a second reference signal. The first reference signal corresponds to the channel information of the first beam, and the second reference signal corresponds to the channel information of the second beam.

[0067] In this application, after broadcasting the TCI-state, for example, broadcasting TCI-state1 as a narrow beam and TCI-state2 as a wide beam, the network device only needs to indicate the beam information to the terminal via DCI in subsequent downlink scheduling. By indicating the identifier (1 or 2) of a certain TCI-state, the terminal can be informed whether to use a wide beam or a narrow beam for data transmission, thereby realizing flexible switching and management of wide and narrow beams.

[0068] In one possible implementation, the first information is contained in the SSB, and the first information includes second indication information, which is used to indicate that CORESET0 and SIB1 are quasi-co-located, or to indicate that CORESET0, SIB1 and the DMRS of the random access response message are quasi-co-located.

[0069] For example, the second indication information is the bit information in the MIB / PBCH.

[0070] The network side directly indicates the QCL relationship between multiple downlink beams to the UE. Based on this indication, the terminal can use different spatial parameters to perform beam reception measurements, avoiding the terminal always defaulting to the quasi-co-address relationship between the downlink reference signal port and the SSB wide beam during the initial access process. In other words, it uses a narrow beam for communication in advance, improving communication performance.

[0071] In one possible implementation, the first signal includes third indication information, which is used to instruct the terminal device to receive the second beam on the first time domain resource.

[0072] After broadcasting the initial information using a wide beam, network devices then need to transmit multiple narrow beams within the wide beam's coverage area for more precise positioning of terminal devices. When network devices are limited in capacity and cannot simultaneously transmit multiple narrow beams downlink, time division multiplexing (TDM) can be used to round-robin the narrow beams. The third indication information is used to indicate the receiving location for the TDM round-robin transmission.

[0073] A third aspect of this application provides a communication device, which includes a transceiver unit and a processing unit; the transceiver unit is used to receive first information, the first information being carried on a first beam; the processing unit is used to determine a second beam based on the first information, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, the first signal being used by a terminal device for random access.

[0074] In the third aspect of this application, the constituent modules of the communication device can also be used to execute the steps performed in various possible implementations of the first aspect and achieve the corresponding technical effects. For details, please refer to the first aspect, which will not be repeated here.

[0075] A fourth aspect of this application provides a communication device, comprising a processing unit and a transceiver unit. The processing unit is used to determine first information, the first information being carried on a first beam, the first information being used to determine a second beam, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, the first signal being used by a terminal device for random access. The transceiver unit is used to transmit the first information.

[0076] In the fourth aspect of this application, the constituent modules of the communication device can also be used to perform the steps executed in various possible implementations of the second aspect and achieve the corresponding technical effects. For details, please refer to the second aspect, which will not be repeated here.

[0077] A fifth aspect of this application provides a communication device including at least one processor coupled to a memory; the memory is used to store a program or instructions; the at least one processor is used to execute the program or instructions to cause the device to implement the method described in any possible implementation of any of the first to second aspects. Optionally, the communication device may include the memory.

[0078] The sixth aspect of this application provides a communication device including at least one logic circuit and an input / output interface; the logic circuit is used to perform the method as described in any one of the possible implementations of the first to second aspects described above.

[0079] The seventh aspect of this application provides a communication system, which includes the first communication device and the second communication device described above.

[0080] An eighth aspect of this application provides a computer-readable storage medium for storing one or more computer-executable instructions, which, when executed by a processor, perform the method as described in any possible implementation of any of the first to second aspects described above.

[0081] The ninth aspect of this application provides a computer program product (or computer program) that, when executed by a processor, performs the method described in any possible implementation of any of the first to second aspects described above.

[0082] The tenth aspect of this application provides a chip or chip system including at least one processor for supporting a communication device in implementing the methods described in any possible implementation of any of the first to second aspects. For example, the chip may be a baseband chip, a modem chip, a SoC chip (such as an SoC chip containing a modem core), a SIP chip, or a communication module, etc.

[0083] In one possible design, the chip or chip system may further include a memory for storing program instructions and data necessary for the communication device. The chip system may be composed of chips or may include chips and other discrete devices. Optionally, the chip system may also include interface circuitry that provides program instructions and / or data to the at least one processor.

[0084] The technical effects of any of the design methods in aspects three through ten can be found in the technical effects of the different design methods in aspects one through two above, and will not be repeated here. Attached Figure Description

[0085] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0086] Figure 1 is a schematic diagram of an embodiment of the four-step random access in this application;

[0087] Figure 2 is a schematic diagram of a communication system architecture provided in an embodiment of this application;

[0088] Figure 3 is a flowchart illustrating a communication method provided in an embodiment of this application;

[0089] Figure 4 is a schematic diagram of a network device transmitting wide and narrow beams;

[0090] Figure 5 is a schematic diagram of a signal transmission mode provided in an embodiment of this application;

[0091] Figure 6 is a schematic diagram of another signal transmission mode provided in an embodiment of this application;

[0092] Figure 7 is a schematic diagram of a quasi-co-location configuration provided in an embodiment of this application;

[0093] Figure 8 is a schematic diagram of an embodiment of the communication device in this application;

[0094] Figure 9 is a schematic diagram of another embodiment of the communication device in this application;

[0095] Figure 10 is a schematic diagram of another embodiment of the communication device in this application;

[0096] Figure 11 is a schematic diagram of another embodiment of the communication device in this application. Detailed Implementation

[0097] First, some terms used in the embodiments of this application will be explained to facilitate understanding by those skilled in the art.

[0098] (1) The terms "system" and "network" in the embodiments of this application can be used interchangeably. "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of A, B and C" includes A, B, C, AB, AC, BC or ABC. And, unless otherwise specified, the ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects and are not used to limit the order, sequence, priority or importance of multiple objects.

[0099] (2) In the embodiments of this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which may include sending directly through the air interface or sending indirectly through the air interface by other units or modules. "Receive information from YY" can be understood as the source of the information being YY, which may include receiving directly from YY through the air interface or receiving indirectly from YY through the air interface by other units or modules. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0100] In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via buses, wiring, or interfaces.

[0101] It is understandable that information may undergo necessary processing, such as encoding and modulation, between the source and destination, but the destination can understand the valid information from the source. Similar statements in this application can be interpreted in a similar way and will not be elaborated further.

[0102] (3) In the embodiments of this application, "instruction" may include direct instruction and indirect instruction, as well as explicit instruction and implicit instruction. The information indicated by a certain piece of information (as described below, the instruction information) is called the information to be instructed. In the specific implementation process, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly indicate the information to be instructed by indicating other information, where there is an association between the other information and the information to be instructed; or it can only indicate a part of the information to be instructed, while the other parts of the information to be instructed are known or pre-agreed upon. For example, the instruction can be implemented by using a pre-agreed (e.g., protocol predefined) arrangement of various information, thereby reducing the instruction overhead to a certain extent. This application does not limit the specific method of instruction. It is understood that for the sender of the instruction information, the instruction information can be used to indicate the information to be instructed, and for the receiver of the instruction information, the instruction information can be used to determine the information to be instructed.

[0103] (4) Configuration and Pre-configuration: In this application, both configuration and pre-configuration are used. Configuration refers to the network device / server sending configuration information or parameter values ​​to the terminal device via messages or signaling, so that the terminal device can determine the communication parameters or resources for transmission based on these values ​​or information. Pre-configuration is similar to configuration; it can be parameter information or parameter values ​​pre-negotiated between the network device / server and the terminal device, parameter information or parameter values ​​specified by standard protocols for use by the base station / network device or terminal device, or parameter information or parameter values ​​pre-stored in the base station / server or terminal device. This application does not limit this.

[0104] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments of this application, and the various methods / designs / implementations within each embodiment, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments and between the various methods / designs / implementations within each embodiment are consistent and can be mutually referenced. The technical features in different embodiments and the various methods / designs / implementations within each embodiment can be combined to form new embodiments, methods, or implementations based on their inherent logical relationships. The following descriptions of the embodiments of this application do not constitute a limitation on the scope of protection of this application.

[0105] (5) Beam;

[0106] A beam is a communication resource. A beam can be wide, narrow, or other types of beams, and the technology used to form a beam can be beamforming technology or other techniques. Beamforming technology can specifically be digital beamforming technology, analog beamforming technology, and hybrid digital / analog beamforming technology. Different beams can be considered different resources.

[0107] In the NR protocol, a beam can be referred to as a spatial domain filter, spatial filter, spatial domain parameter, spatial parameter, spatial domain setting, spatial setting, quasi-colocation (QCL) information, QCL assumption, or QCL indication, etc. The beam can be indicated by the transmission configuration indicator state (TCI-state) parameter or by the spatial relation parameter. Therefore, in this application, the beam can be replaced by spatial domain filter, spatial filter, spatial parameter, spatial parameter, spatial setting, spatial setting, QCL information, QCL assumption, QCL indication, TCI-state (including uplink TCI-state and downlink TCI-state), or spatial relation, etc. These terms are also equivalent to each other. The beam can also be replaced with other beam-related terms, which are not limited herein.

[0108] Beamforming and other technologies allow for flexible adjustment of beam coverage, creating wide or narrow beams to meet diverse needs. Wide beams, with their large beam angles, can transmit signals across a wide range of directions, achieving broad coverage, but their gain is relatively low. In contrast, narrow beams concentrate energy within a smaller area, exhibiting higher energy focusing capabilities. In non-terrestrial network (NTN) scenarios, this characteristic of narrow beams can significantly enhance the effective isotropic radiated power (EIRP) of satellite signals, thereby improving the link budget of a downlink channel. Beamforming technologies can specifically include digital beamforming, analog beamforming, hybrid digital beamforming, or hybrid analog beamforming.

[0109] Beams are generally associated with resources. For example, during beam measurement, network devices measure different beams using different resources. The terminal devices provide feedback on the measured resource quality, allowing the network devices to determine the quality of the corresponding beam. During data transmission, beam information is also indicated through its corresponding resources. For instance, network devices use the TCI field in downlink control information (DCI) to indicate the physical downlink shared channel (PDSCH) beam information of the terminal devices.

[0110] In one possible implementation, multiple beams with the same or similar communication characteristics are considered as a single beam. A beam may include one or more antenna ports for transmitting data channels, control channels, and probe signals, etc. The one or more antenna ports forming a beam can also be considered as a set of antenna ports.

[0111] (6) Quasi-collocated (QCL);

[0112] Quasi-co-location is used to indicate that multiple resources share one or more identical or similar communication characteristics. For multiple resources with quasi-co-location, identical or similar communication configurations can be used. For example, if two antenna ports have quasi-co-location, the large-scale channel characteristics of one port transmitting one symbol can be inferred from the large-scale channel characteristics of the other port transmitting one symbol. Large-scale characteristics can include: delay spread, average delay, Doppler spread, Doppler shift, average gain, receive parameters, terminal equipment receive beam number, transmit / receive channel correlation, receive angle of arrival, spatial correlation of receiver antennas, angel-of-arrival (AoA), average angle of arrival, AoA spread, etc. Specifically, the co-location indicator is used to indicate whether at least two sets of antenna ports have a co-location relationship, including: the co-location indicator indicates whether the channel state information reference signals transmitted by at least two sets of antenna ports originate from the same transmission point, or the co-location indicator indicates whether the channel state information reference signals transmitted by at least two sets of antenna ports originate from the same beamgroup.

[0113] (7) Random access channel (RACH):

[0114] In current NR technology, the initial access and service data transmission phases are clearly defined:

[0115] Figure 1 shows a flowchart of the initial access and service data transmission phases of NR. Figure 1 uses a four-step random access process as an example, but it can also be applied to a two-step random access process in actual use. Specifically, the process is as follows:

[0116] During the initial access phase, network devices (e.g., gNBs) use a wide beam to transmit the SSB synchronization channel, and other channels are associated with the SSB beam;

[0117] Step 1: The terminal device receives System Information Block (SIB) 1 from the SSB and obtains cell information, Random Access Chance (RACH) occasion (RO) resource configuration information, etc. from SIB1. Further, the terminal device determines the RO resource it will use based on the SSB index and RO resource configuration information, and initiates a random access request by sending a Physical Random Access Channel (PRACH) on the RO resource associated with the SSB.

[0118] Specifically, before receiving SIB1, the terminal needs to obtain the scheduling information of SIB1 through the physical downlink control channel (PDCCH). The terminal decodes the downlink control information (DCI) of the PDCCH based on the demodulation reference signal (DMRS) of the PDCCH in order to obtain the frequency domain and time domain resources of the physical downlink shared channel (PDSCH) where SIB1 is located.

[0119] Step 2: The network device receives the above PRACH and sends a random access response (RAR) to the terminal device. The RAR schedules the terminal device to send message 3 (Msg3) in the random access process on the corresponding time and frequency resources to initiate a radio resource control (RRC) setup request.

[0120] Step 3: After receiving Msg3, the network device sends message 4 (Msg4) during the random access process to the terminal device to establish RRC (RRCSetup);

[0121] Step 4: After receiving the above message 4 (Msg4), the terminal device completes the initial access process.

[0122] This application can be applied to long-term evolution (LTE) systems, NR systems, or future communication systems. These communication systems include at least one network device and / or at least one terminal device.

[0123] Please refer to Figure 2, which is a schematic diagram of a communication system architecture provided in an embodiment of this application. As shown in Figure 2, in the communication network that integrates NR and NTN, the ground mobile terminal accesses the network through 5G NR, and the 5G base station is deployed on satellites and connected to the ground core network through a wireless link. Simultaneously, a wireless link exists between the satellites to complete signaling interaction and user data transmission between base stations.

[0124] The network elements in Figure 2 and their interfaces are described below:

[0125] Terminal: Mobile devices that support 5G NR, specifically referring to user equipment (UE), access terminal, subscriber unit, user station, mobile station, customer premises equipment (CPE), remote station, remote terminal, mobile device, user terminal, wireless communication equipment, user agent, or user equipment. Terminal devices can also be satellite phones, cellular phones, smartphones, wireless data cards, wireless modems, machine-type communication devices, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, communication devices mounted on high-altitude aircraft, wearable devices, drones, robots, point-of-sale (POS) machines, terminals in device-to-device (D2D) communication, vehicle-to-everything (V2X) terminals, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, and wireless terminals in smart cities. This application does not limit the scope of wireless terminals, such as those in a city, smart homes, or future communication networks.

[0126] In this embodiment, the device for implementing the functions of the terminal device can be the terminal device itself; or it can be a device capable of supporting the terminal device in implementing the functions, such as a chip system. This device can be installed in the terminal device or used in conjunction with the terminal device. In this embodiment, the chip system can be composed of chips, or it can include chips and other discrete components.

[0127] A 5G base station refers to a radio access network (RAN) node (or device) in a 5G network that connects terminals to the wireless network. It can also be called access network equipment, network equipment, or an evolved Node B (gNB). Its main functions are to provide radio access services, allocate radio resources to access terminals, and provide reliable radio transmission protocols and data encryption protocols. Network equipment can be a node in the RAN, also known as a base station or RAN node (or device). Network equipment can be an evolved Node B (eNB or eNodeB) in LTE; a next-generation Node B (gNB) in 5G networks; a base station in a future public land mobile network (PLMN); a broadband network gateway (BNG); an aggregation switch; or a non-3rd generation partnership project (3GPP) access device, etc. Optionally, the network equipment in this application embodiment may include various forms of base stations, such as: macro base stations, micro base stations (also known as small stations), relay stations, access points, equipment that implements base station functions in communication systems evolved after 5G, transmitting and receiving points (TRPs), transmitting points (TPs), mobile switching centers, and equipment that undertakes base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications. It may also include centralized units (CUs) and distributed units (DUs) in cloud radio access networks (C-RAN) systems, and network equipment in NTN communication systems, i.e., it can be deployed on high-altitude platforms or satellites. This application embodiment does not specifically limit this.

[0128] 5G Core Network: This refers to the equipment in the core network (CN) of a 5G network that provides service support to terminal devices. It is used for user access control, mobility management, session management, user security authentication, billing, and other services. It consists of multiple functional units, which can be divided into control plane functional entities and data plane functional entities. The authentication management function (AMF) is responsible for user access management, security authentication, and mobility management. The user plane function (UPF) is responsible for managing user plane data transmission, traffic statistics, and other functions.

[0129] Ground station: Responsible for forwarding signaling and service data between satellite base stations and the 5G core network.

[0130] 5G New Radio: The wireless link between a terminal and a base station.

[0131] Xn interface: The interface between 5G base stations, mainly used for signaling interactions such as handover.

[0132] NG interface: The interface between the 5G base station and the 5G core network, mainly used for exchanging signaling such as NAS of the core network and user service data.

[0133] It is understood that the names of devices with base station functions may differ in systems with different wireless access technologies, and these will not be shown one by one in the embodiments of this application.

[0134] Optionally, the satellite can be a geostationary earth orbit (GEO) satellite, a non-geostationary earth orbit (NGEO) medium earth orbit (MEO) satellite, or a low earth orbit (LEO) satellite, or a high altitude platform station (HAPS), etc. This application does not limit the specific type of satellite.

[0135] The network architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0136] 3GPP R19 NTN discussion on downlink coverage enhancement: There are too many satellite spools and too few available active beams. Therefore, for the NR SSB scanning process, enhancement is needed in the NTN scenario to speed up the scanning of all spools. A spool refers to the position or direction of a beam used to cover a specific area or user in satellite communications.

[0137] To accelerate SSB scanning in NTN scenarios, an effective strategy is for satellites to use wide beams when transmitting SSBs. Given a fixed total satellite coverage area, a wider scanning beam requires fewer positions, significantly reducing the total SSB scanning time and lowering terminal access latency.

[0138] Compared to wide beams, narrow beams can concentrate energy in a smaller spatial area, thereby improving signal strength and reducing interference. During initial access, using narrow beams for data transmission can improve data transmission reliability and rate, and reduce the problem of repeated transmissions caused by path loss in NTN scenarios.

[0139] However, in the current initial access process of NR, beam management usually follows a simple default configuration (i.e., the beamwidth is unchanged in the default access process), and there is a lack of a suitable mechanism for the management process of narrow beam measurement, reporting and handover.

[0140] To address the aforementioned problems, this application provides a communication method and related apparatus, which will be described in detail below with reference to the accompanying drawings.

[0141] In this application embodiment, network devices in a terrestrial network communication system and satellites in an NTN communication system can be uniformly considered as network devices. The apparatus used to implement the functions of a network device can be a network device itself; it can also be an apparatus capable of supporting the network device in implementing that function, such as a chip system, which can be installed within the network device. In the following description of the technical solutions provided by the embodiments of this application, a satellite is used as an example to illustrate the technical solutions provided by the embodiments of this application. It is understood that when the method provided by the embodiments of this application is applied to a terrestrial network communication system, the actions performed by the satellite can be applied to the base station or network device for execution.

[0142] In this application embodiment, the device for implementing the functions of the terminal device can be the terminal device itself; it can also be a device capable of supporting the terminal device in implementing the functions, such as a chip system, which can be installed in the terminal device. In this application embodiment, the chip system can be composed of chips, or it can include chips and other discrete devices. In the technical solutions provided in this application embodiment, the device for implementing the functions of the terminal device is a terminal or UE as an example to describe the technical solutions provided in this application embodiment.

[0143] Please refer to Figure 3, which is a schematic diagram of an implementation of the communication method provided in this application. The method includes the following steps.

[0144] 301. The network device sends the first information to the terminal device. Correspondingly, the terminal device receives the first information from the network device.

[0145] The first information is carried in the first beam, which is a wide beam. The first information is used to determine the second beam, which is a narrow beam covered by the first beam. In other words, the second beam is located within the coverage area of ​​the first beam. The second beam is used to carry the first signal, which is a signal used by terminal devices for random access.

[0146] Specifically, for a terminal device to enter the connected state, it needs to initiate a random access request and align the uplink and downlink data links with the network device. In this application, the network device first provides coverage over a wide area using a wide beam (i.e., the first beam) and informs the terminal device that it will transmit a narrow beam (i.e., the second beam) in the subsequent time domain resources. The terminal device can measure this narrow beam to obtain its channel measurement parameters so that it can use the narrow beam's channel in subsequent data transmission. The second beam is used to carry the signal for random access, enabling the terminal device and network device to complete the narrow beam alignment during the initial access phase, allowing for early communication using the narrow beam and improving the link's communication performance during the initial access phase.

[0147] For example, a network device broadcasts SSB, SIB1, and SIB19 using a wide beam to ensure coverage; this wide beam contains N narrow beams.

[0148] Please refer to Figure 4, which is a schematic diagram of satellite transmission using wide and narrow beams. The satellite first uses a wider beam (the first beam) for extensive coverage and initial signal transmission. This wide beam helps to quickly locate potential users or areas and establish basic communication links. Subsequently, to improve communication reliability and speed, the system further refines the beam within the area already covered by the first beam, forming one or more narrower beams (the second beam). The coverage area of ​​each narrow beam lies within the coverage area of ​​the wide beam. By concentrating energy in a smaller space, communication with terminal devices within the narrow beam's coverage area is improved, thereby reducing signal strength and interference.

[0149] The following section, in conjunction with step 302, explains the various possible scenarios for the first and second beams.

[0150] 302. The terminal device determines the second beam based on the first information.

[0151] Specifically, the terminal device performs blind detection after receiving the first information. When it detects that the signal characteristics of a certain narrow beam match the indication in the first information, the terminal device determines that the narrow beam is the target narrow beam sent by the network device.

[0152] This application provides three different narrow beam configurations, including:

[0153] Example 1: The network side configures a narrow-beam CSI-RS in a wide-beam SIB1.

[0154] Accordingly, the first beam transmitted by the network device is a wide beam for carrying SIB1, and the second beam transmitted is a narrow beam for carrying CSI-RS.

[0155] The network device configures the specific parameters of the CSI-RS narrow beam in the downlink wide beam SIB1, instructing the terminal device to subsequently measure the corresponding CSI-RS narrow beam. The SIB1 message contains the resource identifiers of multiple narrow beam CSI-RS, as well as the scrambling identifier corresponding to each CSI-RS.

[0156] For example, the network device configuration for CSI-RS is shown in Table 1 below:

[0157] Table 1

[0158] Based on the coverage requirements of the network equipment, M wide beams can be configured, each corresponding to a resource set for transmitting CSI-RS signals, enabling the UE to obtain channel state information. Within each wide beam's resource set, N narrow beams are further subdivided, each corresponding to a resource. To ensure the accuracy and interference resistance of the CSI-RS signal transmission, each narrow beam resource is scrambled. The scrambling identifier ID corresponds to the narrow beam's beam ID. Thus, when the network equipment transmits the narrow beam's CSI-RS, the terminal equipment can identify and decode the CSI-RS signal from different beams based on the scrambling ID to obtain the resource identifier (resource ID) corresponding to that CSI-RS signal (i.e., the second beam).

[0159] Optionally, the CSI-RS (i.e., the second beam) is sent along with the PDSCH of SIB1.

[0160] Optionally, the CSI-RS (i.e., the second beam) is sent after the PDSCH of SIB1.

[0161] Optionally, in order to reduce broadcast overhead and alleviate UE processing complexity, the network device may choose to carry only the resource identifiers of the N CSI-RS narrow beams under the resource set and the scrambling ID corresponding to each CSI-RS narrow beam in each wide beam SIB1.

[0162] Optionally, for more capable network devices, the SIB1 sent can also carry information about the entire resource set.

[0163] Optionally, when configuring CSI-RS, a unique orthogonal covering codes (OCC) sequence can be assigned to each CSI-RS. These OCC sequences are generated using code division multiplexing (CDM) technology and are designed to effectively distinguish different users or data streams, ensuring the accuracy and reliability of signal transmission.

[0164] When a terminal sends uplink data, such as when sending a random access request Msg1 on the physical random access channel (PRACH), it embeds the OCC sequence information carried by the narrow-beam CSI-RS in the seq repetitions of each segment in the preamble. After receiving the information reported by the terminal, the network side uses the configured N OCC sequences to detect the received signal. By comparing the detection energy corresponding to different OCC sequences, the network side can determine the OCC sequence corresponding to the maximum detection energy. This OCC sequence represents the OCC corresponding to the narrow-beam CSI-RS received by the terminal device, thus allowing the network to infer that the area where the terminal device is located is roughly within the coverage area of ​​the narrow-beam CSI-RS.

[0165] For example, the CSI-RS resource set configuration CDM code is divided into CDM4{FD2, TD2}, which means that a CDM group contains 4 narrow beams. In the frequency domain (FD), these 4 narrow beams are multiplexed on two different frequency subcarriers or subbands. In the time domain (TD), these 4 narrow beams are multiplexed on two different time symbols or time slots.

[0166] For example, the OCC is shown in Table 2 below:

[0167] Table 2

[0168] Each narrow beam uniquely corresponds to an OCC sequence. For example, the OCC sequence for the narrow beam with index 0 is (+1, +1, +1, +1), while the OCC sequence for the narrow beam with index 1 is (+1, -1, +1, +1), and so on. When the terminal receives the narrow beam with index 0, it uses the corresponding OCC sequence (+1, +1, +1, +1) to process the sequence repetition. After receiving the information reported by the terminal, the network side will detect each of these four OCC sequences to identify the one with the highest energy corresponding to index 0, thus determining that the narrow beam corresponding to the terminal is the narrow beam with index 0.

[0169] Example 2: The network side configures a narrow-beam DMRS in a wide-beam SSB.

[0170] Accordingly, the network device transmits a first beam, a wide beam, for carrying the SSB, and a second beam, a narrow beam, for carrying the PDCCH DMRS. Within the wide beam SSB, the network device embeds an indication of the PDCCH DMRS scrambling identifier to guide the terminal device in measuring the corresponding narrow DMRS beam. This allows the terminal device to use the narrow beam for communication during the initial access process, improving communication performance.

[0171] Specifically, the SSB message contains first indication information, which identifies N scrambling identifiers, each corresponding to a narrow beam used to carry Type 0 PDCCH DMRS. In one feasible implementation, the first indication information can be carried by bit information on the master information block (MIB) and / or the physical broadcast channel (PBCH).

[0172] Optionally, this first indication information can be mapped using 2 bits of information in the redundancy field of the MIB / PBCH, as follows:

[0173] Method 1: When the value of these 2 bits is 01, it indicates that N=2, that is, the wide-beam SSB contains 2 narrow-beam PDCCH DMRS, where the scrambling identifier (pdcch-DMRS-ScramblingID) of the PDCCH DMRS is mod(cell id+{1,2},1008). That is, each scrambling ID is obtained by adding 1 or 2 to the cell identifier (cell id) of the PDCCH DMRS, and the maximum value does not exceed 1008.

[0174] Method 2: When the value of this 2-bit is 10, it means that N=4, that is, the wide beam SSB contains 4 narrow beam PDCCH DMRS. The scrambling identifier of PDCCH DMRS is also calculated by mod(cell id+{1,2,3,4},1008).

[0175] Mode 3: When the most significant bit (MSB) of these 2 bits is 1, it indicates that narrow-beam PDCCH DMRS measurement is enabled; while the value of the least significant bit (LSB) is used to select the fixed number of narrow beams type in Mode 1 or Mode 2. For example, when the value of the 2 bits is 11, it indicates that the narrow-beam PDCCH DMRS measurement is performed using the Mode 2 configuration.

[0176] In practical applications, scrambling indicator indication may include the above methods or other indication methods to indicate different narrow beam numbers. Regarding the specific indication method, the embodiments of this application are not limited.

[0177] Optionally, when using frequencies below 3 GHz, the first indication information can be recorded using two bits of the sum of the additional 8 bits of the PBCH payload.

[0178] In this embodiment, after the terminal obtains the configuration, when receiving PDCCH DMRS, it avoids using the same spatial Rx parameter as when receiving SSB. The terminal adds N-1 blind detection operations to identify the narrow beam and its corresponding information.

[0179] Specifically, the terminal uses the received PDCCH-DMRS to obtain relevant channel and beam information (such as spatial Rx parameters) based on its own capabilities. Taking a 5MHz bandwidth as an example, PDCCH Type 0 typically occupies the entire bandwidth for transmission. In this case, the generation method of the downlink DMRS sequence is similar to that of the Channel State Information Reference Signal (CSI-RS) sequence in the connected state. Therefore, the terminal can obtain partial beam and channel information by analyzing the DMRS sequence.

[0180] In one possible implementation, the terminal device can also modify the QCL relationship. The original QCL relationship is: SSB has a QCL relationship with CORESET0, and CORESET0 also has a QCL relationship with SIB1 (i.e., {SSB<-QCL->CORESET0<-QCL->SIB1}). The updated QCL relationship becomes: only CORESET0 and SIB1 maintain a QCL relationship (i.e., {SSB, CORESET0<-QCL->SIB1}), while SSB no longer has a direct QCL relationship with CORESET0 / SIB1. Therefore, when receiving CORESET0 and SIB1 signals, the terminal needs to use a different receiving beam than when receiving SSB.

[0181] Example 3: The network side is configured with QCL relationships between multiple downlink beams.

[0182] The network directly indicates the QCL relationship between multiple downlink beams such as SSB, CORESET0, SIB1, and PDSCH to the UE. Based on this indication, the terminal can use different spatial parameters for beam reception measurements, avoiding the initial default QCL relationship between the downlink reference signal port and the wide SSB beam during access. Correspondingly, the first beam transmitted by the network device is a wide beam carrying the SSB, and the second beam carries one or more signals for random access by the terminal device, such as the random access response (Msg2) and contention resolution (Msg4) for CORESET0, SIB1, and PDSCH. The uplink beam received by the network device at Msg3 can also be narrowed after measurement, improving the communication performance of Msg3.

[0183] Specifically, the SSB message contains a second indication information, which is used to indicate the QCL relationship between multiple downlink beams.

[0184] Optionally, this second indication information can be mapped using 2 bits of information in the redundancy field of the MIB / PBCH, as follows:

[0185] For example, when the value of this 2-bit is 00, it means SSB<-QCL->CORESET0<-QCL->SIB1, that is, the default is to use SSB wide beam.

[0186] When the value of this 2-bit is 01, it means that CORESET0 <- QCL -> SIB1, that is, CORESET0 and SIB1 maintain a QCL relationship, but there is no longer a QCL relationship with the SSB wide beam.

[0187] When the value of this 2-bit is 10, it indicates that CORESET0 <- QCL -> SIB1 <- QCL -> PDSCH DMRS (Msg2 and / or Msg4). Similar to the indication in mode 2, the subsequent downlink beams of SSB are all in QCL relationship. The terminal only needs to detect the beam of CORESET0 to use the spatial parameters of that beam to receive signals from other downlink beams.

[0188] In practical applications, the indication of QCL relationships may include the above methods or other indication methods to indicate different QCL relationships. The specific indication methods are not limited in the embodiments of this application.

[0189] After broadcasting the initial information using a wide beam, network devices then need to transmit multiple narrow beams within the wide beam's coverage area for more precise positioning of terminal devices. When network devices are limited in capacity and cannot simultaneously transmit multiple narrow beams downlink, time division multiplexing (TDM) can be used to transmit the narrow beams in rotation.

[0190] In one possible implementation, the first information includes third indication information, which is used to instruct the terminal device to receive the second beam on the first time domain resource, i.e., to indicate the receiving position of the narrow beam.

[0191] For example, if the first beam sent by the network device is a wide beam for carrying an SSB, the SSB includes a signal transmission pattern for PDCCH and / or SIB1, which is used to instruct the terminal device how to receive PDCCH and / or SIB1.

[0192] Please refer to Figure 5, which is a schematic diagram of a possible signal transmission mode. The network device transmits four wide beams carrying SSBs: SSB0, SSB1, SSB2, and SSB3. As shown in Figure 5, each SSB occupies two time slots in the pattern. The beam carrying the PDCCH is a narrow beam, and a wide beam resource set includes four narrow beam resources, while the beam carrying SIB1 is a wide beam.

[0193] For example, the first slot of SSB0 indicates the receiving positions (time domain resources) of the four narrow beam PDCCHs, such as receiving these four narrow beam PDCCHs on symbols 1, 3, 5, and 7 of the slot; while the second slot indicates the receiving position (time domain resource) of the wide beam SIB1.

[0194] In one possible implementation, both the beam carrying the PDCCH and the beam carrying SIB1 are narrow beams. In this case, each SSB needs to occupy 4 slots in the pattern. As shown in Figure 6, each slot indicates the receiving position (time domain resource) of a narrow beam PDCCH and a wide beam SIB1.

[0195] 303. The terminal device sends a second message to the network device. Correspondingly, the network device receives the second message from the terminal device.

[0196] Optionally, the embodiment shown in Figure 3 further includes step 303. Step 303 may be performed after step 302.

[0197] The second piece of information is used to indicate the second beam, enabling network devices to identify the terminal location by combining the reported narrow beam information with the UID. This allows for the use of uplink and downlink narrow beams in subsequent access procedures, improving link budget.

[0198] In one possible implementation, in the scenario shown in Example 1 above, the second information is contained in the response message (Msg3) of the random access response. After receiving Msg3, the network device can accurately identify the location of the terminal based on the narrow beam information and UID reported therein.

[0199] Optionally, the second information may be included in the medium access control (MAC) subheader of Msg3, or in the Msg3 payload.

[0200] Specifically, after detecting the second beam based on the scrambling identifier, the terminal device will determine the resource identifier corresponding to the second beam and obtain the channel measurement parameters of the second beam, such as Doppler shift, delay, and spatial filter information.

[0201] Then, the terminal device initiates a random access request (Msg1) to the network device.

[0202] In one possible implementation, Msg1 is carried on a wide beam for reporting, and correspondingly, the network device also sends a random access response (RAR), namely Msg2, via the wide beam. Subsequently, the terminal device carries the measurement results of the second beam in Msg3, and the network device determines the narrow beam corresponding to the area to which the terminal device belongs based on Msg3.

[0203] Using the above method, in the later stages of the access process (i.e., Msg4 and Msg5 stages), network devices and terminal devices can communicate using uplink and downlink narrow beams, thereby improving the link budget.

[0204] In one possible implementation, when the second beam carries a CSI-RS signal, the second information reported by the terminal on Msg3 includes one or more of the CSI-RS measurement results, the resource ID of the second beam, the identifier of the second beam, or the measurement report of the CSI-RS.

[0205] In one possible implementation, the second information indicating the second beam to the network device is also included in the random access request (Msg1). The second beam is indicated to the network device in Msg1. This allows the network device and the terminal device to communicate using a narrow beam as early as the Msg2 stage, improving communication performance.

[0206] In one possible implementation, the second information included in Msg1 includes a first seq repetition, which is generated based on the OCC sequence corresponding to the CSI-RS sent by the network side. The preceding steps have already described the calculation method for the network device to determine the corresponding narrow beam based on the OCC sequence, and will not be repeated here.

[0207] 304. The network device sends third information to the terminal device. Correspondingly, the terminal device receives the third information from the network device.

[0208] Optionally, the embodiment shown in Figure 3 further includes step 304. Step 304 may be performed before step 303.

[0209] Before the terminal device sends the second information, the network device can send a third information to the terminal device. This third information is used to indicate the first time domain resources. The third information is carried in a third beam, and the third beam and the second beam have a QCL relationship.

[0210] In one possible implementation, the third beam transmitted by the network device is a narrow beam for carrying SIB1, and the second beam is a narrow beam for carrying PDCCH DMRS.

[0211] For example, the first time-domain resource can be a RACH resource, with each RACH resource corresponding to the scrambling identifier ID of a narrow beam. For instance, when a wide beam contains four narrow beams, the RACH resources and preamble should be divided into four groups; each group is associated with the scrambling ID of a narrow beam in a PDCCH DMRS. Based on the received scrambling ID corresponding to the second beam, the terminal initiates a random access request (Msg1) on the corresponding RACH resource.

[0212] After detecting the preamble of the second information, the network side can identify the RACH resource used by the terminal and thus determine the corresponding narrow beam. Based on the mapping relationship between the preamble, RACH resource, and DMRS scrambling ID, the network device and the terminal device can communicate using the narrow beam in advance during the Msg2 stage, improving communication performance.

[0213] 305. The network device sends a first broadcast message. Correspondingly, the terminal device receives the first broadcast message from the network device.

[0214] Optionally, the embodiment shown in Figure 3 further includes step 304. Step 305 may be performed after step 303.

[0215] Specifically, network devices carry the Transmission Configuration Indicator (TCI) state configuration in their broadcast SIBs, as shown in Figure 7. Quasi-co-address information (QCL-info) is a component of the TCI-state configuration. Each QCL-info includes a reference signal resource indicating that downlink transmission in this TCI state should use the same downlink timing, frequency offset, or receive beam as this reference signal resource. This configuration contains two QCL source reference signals, RS1 and RS2. RS1 corresponds to the previous narrow beam configuration (labeled RS1_narrow), with a value of "PDCCH-Type0-dmrsID"; RS2 corresponds to the previous wide beam configuration (labeled RS2_wide), with a value of "SSB-index".

[0216] The receiving beam of the terminal is specifically determined by the type of the QCL-info. The QCL type can have four values: {typeA, typeB, typeC, typeD}. When the QCL type is typeA, typeB, or typeC, downlink transmission should use the same downlink timing and frequency offset as the reference signal resource. When the QCL type is typeD, downlink transmission should use the same receiving beam as the reference signal resource. Each TCI state includes its own index (tci-StateId).

[0217] In this application, after broadcasting the TCI-state, for example, broadcasting TCI-state1 as a narrow beam and TCI-state2 as a wide beam, the network device only needs to indicate the beam information to the terminal via DCI in subsequent downlink scheduling. By indicating the identifier of a certain TCI-state (TCI-stateID-initialAccess), the terminal can be informed whether to use a wide beam or a narrow beam for data transmission, thereby realizing flexible switching and management of wide and narrow beams.

[0218] Referring to Figure 8, this application embodiment provides a communication device 800. This communication device 800 can realize the functions of the terminal device or network device in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments. In this application embodiment, the communication device 800 can be a terminal device (or network device), or it can be an integrated circuit or component inside the terminal device (or network device), such as a chip.

[0219] It should be noted that the transceiver unit 801 may include a transmitting unit and a receiving unit, which are used to perform transmitting and receiving respectively.

[0220] In one possible implementation, when the device 800 is used to execute the method performed by the terminal device in the aforementioned embodiments, the device 800 includes a transceiver unit 801; the transceiver unit 801 is used to receive first information, the first information being carried on a first beam; optionally, the device 800 further includes a processing unit 802, the processing unit 802 being used to determine a second beam based on the first information, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, the first signal being used by the terminal device for random access.

[0221] In one possible implementation, when the device 800 is used to execute the method performed by the second communication device in the aforementioned embodiments, the device 800 includes a processing unit 802; the processing unit 802 is used to determine first information, the first information being carried on a first beam, the first information being used to determine a second beam, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, the first signal being used by the terminal device for random access. Optionally, the device 800 further includes a transceiver unit 801, the transceiver unit 801 being used to transmit the first information.

[0222] It should be noted that the information execution process of the unit of the above-mentioned communication device 800 can be specifically described in the method embodiment shown above in this application, and will not be repeated here.

[0223] Please refer to Figure 9, which is another schematic structural diagram of the communication device 900 provided in this application. The communication device 900 includes an input / output interface 901 and a logic circuit 902. The communication device 900 can be a chip or an integrated circuit.

[0224] In this context, the transceiver unit 801 shown in Figure 8 can be a communication interface, which can be the input / output interface 901 in Figure 9, and the input / output interface 901 can include an input interface and an output interface. Alternatively, the communication interface can also be a transceiver circuit, which can include an input interface circuit and an output interface circuit.

[0225] Optionally, the input / output interface 901 is used to receive first information, which is carried in a first beam; the logic circuit 902 is used to determine a second beam based on the first information, the second beam being a narrow beam covered by the first beam, the second beam being used to carry a first signal, and the first signal being used by the terminal device for random access.

[0226] Optionally, logic circuit 902 is used to determine first information, which is carried in a first beam. The first information is also used to determine a second beam, which is a narrow beam covered by the first beam. The second beam is used to carry a first signal, which is used by the terminal device for random access. Input / output interface 901 is used to send the first information.

[0227] The input / output interface 901 and the logic circuit 902 can also perform other steps executed by the terminal device or network device in any embodiment and achieve corresponding beneficial effects, which will not be elaborated here.

[0228] In one possible implementation, the processing unit 802 shown in FIG8 can be the logic circuit 902 in FIG9.

[0229] Optionally, the logic circuit 902 can be a processing device, the functions of which can be partially or entirely implemented in software.

[0230] Optionally, the processing apparatus may include a memory and a processor, wherein the memory is used to store a computer program, and the processor reads and executes the computer program stored in the memory to perform the corresponding processing and / or steps in any of the method embodiments.

[0231] Optionally, the processing device may consist of only a processor. A memory for storing computer programs is located outside the processing device, and the processor is connected to the memory via circuitry / wires to read and execute the computer programs stored in the memory. The memory and processor may be integrated together or physically independent of each other.

[0232] Optionally, the processing device may be one or more chips, or one or more integrated circuits. For example, the processing device may be one or more field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), system-on-chips (SoCs), central processing units (CPUs), network processors (NPs), digital signal processors (DSPs), microcontroller units (MCUs), programmable logic devices (PLDs), or other integrated chips, or any combination of the above chips or processors.

[0233] Please refer to Figure 10, which shows the communication device 1000 involved in the above embodiments provided in the embodiments of this application. Specifically, the communication device 1000 can be the communication device as a terminal device in the above embodiments. The communication device shown in Figure 10 is implemented through a terminal device (or a component in the terminal device).

[0234] The present invention provides a possible logical structure diagram of the communication device 1000, which may include, but is not limited to, at least one processor 1001 and a communication port 1002.

[0235] In Figure 8, the transceiver unit 801 can be a communication interface, which can be the communication port 1002 in Figure 10. The communication port 1002 can include an input interface and an output interface. Alternatively, the communication port 1002 can also be a transceiver circuit, which can include an input interface circuit and an output interface circuit.

[0236] Further optionally, the device may also include at least one of a memory 1003 and a bus 1004. In the embodiments of this application, the at least one processor 1001 is used to control the operation of the communication device 1000.

[0237] Furthermore, the processor 1001 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0238] It should be noted that the communication device 1000 shown in Figure 10 can be used to implement the steps implemented by the terminal device in the aforementioned method embodiments and to achieve the corresponding technical effects of the terminal device. The specific implementation of the communication device shown in Figure 10 can be referred to the description in the aforementioned method embodiments, and will not be repeated here.

[0239] Please refer to Figure 11, which is a schematic diagram of the structure of the communication device 1100 involved in the above embodiments provided in the embodiments of this application. The communication device 1100 can specifically be a communication device as a network device in the above embodiments. The communication device shown in Figure 11 is implemented by a network device (or a component in a network device). The structure of the communication device can refer to the structure shown in Figure 11.

[0240] The communication device 1100 includes at least one processor 1111 and at least one network interface 1114. Optionally, the communication device further includes at least one memory 1112, at least one transceiver 1113, and one or more antennas 1115. The processor 1111, memory 1112, transceiver 1113, and network interface 1114 are connected, for example, via a bus. In this embodiment, the connection may include various interfaces, transmission lines, or buses, etc., and this embodiment is not limited thereto. The antenna 1115 is connected to the transceiver 1113. The network interface 1114 enables the communication device to communicate with other communication devices through a communication link. For example, the network interface 1114 may include a network interface between the communication device and core network equipment, such as an S1 interface; the network interface may also include a network interface between the communication device and other communication devices (e.g., other network devices or core network equipment), such as an X2 or Xn interface.

[0241] In Figure 8, the transceiver unit 801 can be a communication interface, which can be the network interface 1114 in Figure 11. The network interface 1114 can include an input interface and an output interface. Alternatively, the network interface 1114 can also be a transceiver circuit, which can include an input interface circuit and an output interface circuit.

[0242] The processor 1111 is primarily used to process communication protocols and communication data, control the entire communication device, execute software programs, and process data from the software programs, for example, to support the actions described in the embodiments of the communication device. The communication device may include a baseband processor and a central processing unit (CPU). The baseband processor is primarily used to process communication protocols and communication data, while the CPU is primarily used to control the entire terminal device, execute software programs, and process data from the software programs. The processor 1111 in Figure 11 can integrate the functions of both a baseband processor and a CPU. Those skilled in the art will understand that the baseband processor and CPU can also be independent processors interconnected via technologies such as buses. Those skilled in the art will understand that a terminal device may include multiple baseband processors to adapt to different network standards, and multiple CPUs to enhance its processing capabilities. Various components of the terminal device can be connected via various buses. The baseband processor can also be described as a baseband processing circuit or a baseband processing chip. The CPU can also be described as a central processing circuit or a central processing chip. The function of processing communication protocols and communication data can be built into the processor or stored in memory as a software program, which is then executed by the processor to implement the baseband processing function.

[0243] The memory is primarily used to store software programs and data. The memory 1112 can exist independently or be connected to the processor 1111. Optionally, the memory 1112 can be integrated with the processor 1111, for example, integrated into a single chip. The memory 1112 can store program code that executes the technical solutions of the embodiments of this application, and its execution is controlled by the processor 1111. The various types of computer program code being executed can also be considered as drivers for the processor 1111.

[0244] Figure 11 shows only one memory and one processor. In actual terminal devices, there may be multiple processors and multiple memories. Memory can also be called storage medium or storage device, etc. Memory can be a storage element on the same chip as the processor, i.e., an on-chip storage element, or it can be a separate storage element; this application does not limit this.

[0245] Transceiver 1113 can be used to support the reception or transmission of radio frequency signals between a communication device and a terminal. Transceiver 1113 can be connected to antenna 1115. Transceiver 1113 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 1115 can receive radio frequency signals. The receiver Rx of transceiver 1113 is used to receive the radio frequency signals from the antennas, convert the radio frequency signals into digital baseband signals or digital intermediate frequency signals, and provide the digital baseband signals or digital intermediate frequency signals to processor 1111 so that processor 1111 can perform further processing on the digital baseband signals or digital intermediate frequency signals, such as demodulation and decoding. In addition, the transmitter Tx in transceiver 1113 is also used to receive the modulated digital baseband signals or digital intermediate frequency signals from processor 1111, convert the modulated digital baseband signals or digital intermediate frequency signals into radio frequency signals, and transmit the radio frequency signals through one or more antennas 1115. Specifically, the receiver Rx can selectively perform one or more stages of downmixing and analog-to-digital conversion on the radio frequency signal to obtain a digital baseband signal or a digital intermediate frequency (IF) signal. The order of these downmixing and IF conversion processes is adjustable. The transmitter Tx can selectively perform one or more stages of upmixing and digital-to-analog conversion on the modulated digital baseband signal or digital IF signal to obtain a radio frequency signal. The order of these upmixing and IF conversion processes is also adjustable. The digital baseband signal and the digital IF signal can be collectively referred to as digital signals.

[0246] The transceiver 1113 can also be called a transceiver unit, transceiver, transceiver device, etc. Optionally, the device in the transceiver unit that performs the receiving function can be regarded as the receiving unit, and the device in the transceiver unit that performs the transmitting function can be regarded as the transmitting unit. That is, the transceiver unit includes a receiving unit and a transmitting unit. The receiving unit can also be called a receiver, input port, receiving circuit, etc., and the transmitting unit can be called a transmitter, transmitter, or transmitting circuit, etc.

[0247] It should be noted that the communication device 1100 shown in Figure 11 can be used to implement the steps implemented by the network device in the aforementioned method embodiments and achieve the corresponding technical effects of the network device. The specific implementation of the communication device 1100 shown in Figure 11 can be referred to the description in the aforementioned method embodiments, and will not be repeated here.

[0248] This application also provides a computer-readable storage medium for storing one or more computer-executable instructions. When the computer-executable instructions are executed by a processor, the processor performs the method described in the possible implementations of the terminal device and network device in the foregoing embodiments.

[0249] This application also provides a computer program product (or computer program) that, when executed by a processor, allows the processor to execute the methods described above for the possible implementation of terminal devices and network devices.

[0250] This application also provides a chip system including at least one processor for supporting a communication device in implementing the functions involved in the possible implementations of the communication device described above. Optionally, the chip system further includes an interface circuit that provides program instructions and / or data to the at least one processor. In one possible design, the chip system may further include a memory for storing the program instructions and data necessary for the communication device. The chip system may be composed of chips or may include chips and other discrete devices, wherein the communication device may specifically be the terminal device and network device in the aforementioned method embodiments.

[0251] This application also provides a communication system, which includes the terminal device and network device in any of the above embodiments.

[0252] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0253] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0254] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A communication method characterized by comprising: include: Receive first information, which is carried in a first beam; The second beam is determined based on the first information. The second beam is a narrow beam covered by the first beam. The second beam is used to carry the first signal. The first signal is used by the terminal device for random access.

2. The method of claim 1, wherein, The method further includes: Send a second message, which is used to indicate the second beam, and the second message includes information for random access.

3. The method of claim 2, wherein, The first information is contained in system message block 1SIB1. The first information includes resource identifiers of multiple channel state information reference signals (CSI-RS) and scrambling identifiers of each of the multiple CSI-RS. The first signal is the first channel state information reference signal (CSI-RS); Determining the second beam based on the first information includes: The first CSI-RS is detected based on the scrambling identifier of each CSI-RS to obtain the resource identifier of the second beam, wherein the first CSI-RS is one of the plurality of CSI-RS.

4. The method of claim 3, wherein, The second information includes one or more of the measurement results of the first CSI-RS, the resource identifier of the second beam, the identifier of the second beam, or the measurement report of the first CSI-RS.

5. The method of claim 4, wherein, The second information is contained in the first message, which is used to request random access.

6. The method according to claim 4 or 5, characterized in that, The first information also includes an orthogonal coverage code (OCC) sequence for each of the plurality of CSI-RSs, and the second information also includes a first repeating sequence, which is generated based on the OCC sequence of the first CSI-RS.

7. The method of claim 4, wherein, The second information is contained in the second message, which is a response message for the random access response.

8. The method of claim 2, wherein, The first information is contained in the Synchronization Message Block (SSB). The first information includes first indication information, which is used to indicate multiple scrambling identifiers, each of which corresponds to a narrow beam. The first signal is the demodulation reference signal DMRS on the physical downlink control channel PDCCH; Determining the second beam based on the first information includes: According to the first indication information, the DMRS is detected by the first spatial parameters to obtain the channel characteristics of the second beam. The first spatial parameters are different from the spatial parameters of the SSB. The scrambling identifier of the DMRS is one of the plurality of scrambling identifiers.

9. The method of claim 8, wherein, The method further includes: The first quasi-co-location relationship is modified to the second quasi-co-location relationship. The first quasi-co-location relationship is used to indicate that the SSB, control resource set 0 CORESET0 and system message block 1 SIB1 are quasi-co-location relationships, and the second quasi-co-location relationship is used to indicate that the CORESET0 and SIB1 are quasi-co-location relationships.

10. The method according to claim 8 or 9, characterized in that, The method further includes: Receive third information, the third information being used to indicate a first time-domain resource, the third information being carried in a third beam, the third beam being quasi-co-located with the second beam; The sending of the second information includes: A first message is sent based on the first time domain resource. The first message includes the second information and is used to request random access.

11. The method according to any one of claims 2-10, characterized in that, The method further includes: A first broadcast message is received, the first broadcast message including a first transmission configuration indication state, the first transmission configuration indication state being used to indicate a first reference signal or a second reference signal, the first reference signal corresponding to the channel information of the first beam, and the second reference signal corresponding to the channel information of the second beam.

12. The method of claim 1, wherein, The first information is contained in the SSB, and the first information includes second indication information, which is used to indicate that CORESET0 and SIB1 are quasi-co-located, or to indicate that CORESET0, SIB1 and the DMRS of the random access response message are quasi-co-located; Determining the second beam based on the second information includes: Based on the second indication information, the second beam is detected by the first spatial parameters, which are different from the spatial parameters of the SSB.

13. The method according to claims 1-12, characterized by, The first signal includes third indication information, which is used to instruct the terminal device to receive the second beam on a first time domain resource.

14. A communication method, comprising: include: First information is determined, the first information is carried in a first beam, the first information is used to determine a second beam, the second beam is a narrow beam covered by the first beam, the second beam is used to carry a first signal, the first signal is used for random access by the terminal device; Send the first message.

15. The method of claim 14, wherein, The method further includes: Receive second information, the second information being used to indicate the second beam, the second information including information for random access.

16. The method of claim 15, wherein, The first information is contained in system message block 1SIB1. The first information includes resource identifiers of multiple channel state information reference signals (CSI-RS) and scrambling identifiers of each of the multiple CSI-RS. The first signal is a first channel state information reference signal (CSI-RS), and the first CSI-RS is one of the multiple CSI-RS.

17. The method of claim 16, wherein, The second information includes one or more of the measurement results of the first CSI-RS, the resource identifier of the second beam, the identifier of the second beam, or the measurement report of the first CSI-RS.

18. The method of claim 17, wherein, The second information is contained in the first message, which is used to request random access.

19. The method of claim 17 or 18, wherein, The first information also includes an orthogonal coverage code (OCC) sequence for each of the plurality of CSI-RSs, and the second information also includes a first repeating sequence, which is generated based on the OCC sequence of the first CSI-RS.

20. The method of claim 17, wherein, The second information is contained in the second message, which is a response message for the random access response.

21. The method of claim 15, wherein, The first information is contained in the Synchronization Message Block (SSB). The first information includes first indication information, which is used to indicate multiple scrambling identifiers. Each of the multiple scrambling identifiers corresponds to a narrow beam. The first signal is the Demodulation Reference Signal (DMRS) on the Physical Downlink Control Channel (PDCCH). The scrambling identifier of the DMRS is one of the multiple scrambling identifiers.

22. The method of claim 21, wherein, The method further includes: Send a third message, the third message being used to indicate a first time domain resource, the third message being carried on a third beam, the third beam being quasi-co-located with the second beam, and the first time domain resource being used to instruct the terminal device to send the second message.

23. The method of any one of claims 15-22, wherein, The method further includes: Send a first broadcast message, the first broadcast message including a first transmission configuration indication state, the first transmission configuration indication state being used to indicate a first reference signal or a second reference signal, the first reference signal corresponding to the channel information of the first beam, and the second reference signal corresponding to the channel information of the second beam.

24. The method of claim 14, wherein, The first information is contained in the SSB, and the first information includes second indication information, which is used to indicate that CORESET0 and SIB1 are quasi-co-located, or to indicate that CORESET0, SIB1 and the DMRS of the random access response message are quasi-co-located.

25. The method of claims 14-24, wherein, The first signal includes third indication information, which is used to instruct the terminal device to receive the second beam on a first time domain resource.

26. A communications device, characterized by Includes modules or units for performing the method as described in any one of claims 1 to 25.

27. A communications device, characterized by The communication device includes a processor for executing a computer program or computer instructions in a memory to perform the method as described in any one of claims 1 to 13, or to perform the method as described in any one of claims 14 to 25.

28. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a communication device, causes the communication device to perform the method as described in any one of claims 1 to 13, or causes the communication device to perform the method as described in any one of claims 14 to 25.

29. A computer program product containing instructions, characterized in that, When it is run on a computer, it causes the computer to perform the method as described in any one of claims 1 to 13, or causes the computer to perform the method as described in any one of claims 14 to 25.

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