Communication methods, devices and storage media

Abstract

This application relates to a communication method, apparatus, and storage medium, applied in the field of wireless communication technology. The method, which can be executed by a terminal, includes: receiving first information broadcast by a network device, the first information including a first RACH resource configuration associated with a first SSB set and a second RACH resource configuration associated with a second SSB set; when it is determined that the SSB with the highest signal strength belongs to the first SSB set, initiating random access using a first uplink beam, the first uplink beam pointing to a first TRP; and when it is determined that the SSB with the highest signal strength belongs to the second SSB set, initiating random access using a second uplink beam, the second uplink beam pointing to a second TRP. This enables the terminal to select the optimal uplink access point through the SSB index in asymmetric deployment scenarios, avoiding interference and delay caused by far-field users blindly accessing the main base station.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, specifically to a communication method, apparatus, and storage medium. Background Technology

[0002] In asymmetric downlink single transmission reception point / uplink multiple transmission reception point (DLsTRP / UL mTRP) deployment scenarios, the network architecture consists of two physically non-co-located transmission reception points: one is a transceiver point (DL / UL TRP) that can transmit and receive both downlink and uplink signals, and the other is an uplink-only transmission point (UL-only TRP) that can only receive uplink signals. Both are typically assumed to have ideal backhaul connectivity and operate on the same bandwidth. This deployment aims to enhance uplink coverage using UL-only TRPs while reusing the downlink coverage of DL / UL TRPs.

[0003] However, conventional initial access mechanisms may result in poor uplink quality, increased system interference, and increased access latency, failing to leverage the near-field reception advantages of UL-only TRP. Summary of the Invention

[0004] The purpose of this application is to provide a communication method, storage medium, electronic device, and program product.

[0005] A first aspect of this application provides a communication method executed by a terminal, the method comprising:

[0006] The network device receives first information broadcast by a network device, wherein the network device includes a first transmission receiving point (TRP) and a second TRP. The first TRP is used to send downlink messages and receive uplink messages, and the second TRP is only used to receive uplink messages. The first information includes a first random access channel (RACH) resource configuration associated with a first synchronization signal block (SSB) set and a second RACH resource configuration associated with a second SSB set.

[0007] When it is determined that the SSB with the highest signal strength belongs to the first SSB set, random access is initiated using the first uplink beam according to the first RACH resource configuration, and the first uplink beam points to the first TRP;

[0008] When it is determined that the SSB with the highest signal strength belongs to the second SSB set, random access is initiated using the second uplink beam according to the second RACH resource configuration, and the second uplink beam points to the second TRP.

[0009] In this embodiment, the terminal can determine which set the strongest SSB belongs to based on the first information broadcast by the network, which includes two SSB sets and their associated RACH resource configurations. This allows the terminal to select the corresponding uplink beam to initiate random access to either the first TRP or the second TRP. This enables the terminal to intelligently select the optimal uplink access point through the SSB index in asymmetric deployment scenarios, avoiding interference and delays caused by far-field users blindly accessing the main base station.

[0010] Optionally, the step of initiating random access using the first uplink beam according to the first RACH resource configuration includes:

[0011] The first uplink beam is determined based on channel reciprocity;

[0012] The step of initiating random access using the second uplink beam according to the second RACH resource configuration includes:

[0013] The second uplink beam is determined based on the first spatial relationship information parameters, and the second RACH resource configuration includes the first spatial relationship information parameters.

[0014] Therefore, by not including spatial relationship information in the first RACH resource configuration, the terminal determines the uplink beam based on channel reciprocity; while the second RACH resource configuration includes spatial relationship information parameters, which the terminal uses to determine the uplink beam. This achieves differentiated processing for the two access modes: multiplexing the downlink beam in reciprocal scenarios and relying on explicit spatial indication in non-reciprocal scenarios, thus improving the accuracy and efficiency of access.

[0015] Optionally, the first spatial relationship information parameter is associated with a first channel state information reference signal (CSI-RS), and the first CSI-RS points to the receiving area of ​​the second TRP.

[0016] Therefore, the first spatial relationship information parameter is associated with a CSI-RS specifically pointing to the second TRP receiving area, ensuring that the uplink beam can be accurately aligned with the target receiving area when the terminal accesses the second TRP, thereby improving the uplink coverage quality and access success rate.

[0017] Optionally, the index of an SSB in the first SSB set is less than or equal to the boundary parameter;

[0018] The index of an SSB in the second SSB set is greater than the boundary parameter;

[0019] The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter.

[0020] Therefore, network devices can divide the network into two SSB sets using a dynamic boundary parameter N, and this parameter is positively correlated with the uplink reception capability of the first TRP. This enables the network side to dynamically adjust the division of the SSB sets according to the base station capabilities, adapting to deployments with different coverage capabilities.

[0021] Optionally, the method further includes:

[0022] Receive the second information sent by the network device;

[0023] The second information includes at least one of the following:

[0024] The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal.

[0025] Downlink TCI status list;

[0026] Uplink TCI status list;

[0027] The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

[0028] Therefore, by sending the second information to the terminal through the network device, indicating the TCI status management mode and the relevant TCI status list, the terminal can determine the downlink beam based on the downlink TCI status list and the uplink beam based on the uplink TCI status list in the first mode.

[0029] Optionally, the downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-located source of the downlink beam corresponding to each first TCI state.

[0030] Therefore, the downlink TCI state list can be used to indicate the quasi-co-located source (such as SSB or CSI-RS) of the downlink beam corresponding to each TCI state, clarifying the source of the reference signal for the downlink beam and providing a basis for the reciprocal multiplexing of the uplink beam.

[0031] Optionally, the uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status;

[0032] The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type.

[0033] The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

[0034] Therefore, the uplink TCI status list can contain two configuration types, where the first type corresponds to the first TRP and the second type corresponds to the second TRP. This enables mixed management of reciprocal beams and independent beams within the same TCI framework, supports dynamic scheduling and beam reuse, solves the problem in existing processing schemes that cannot distinguish between reciprocal and non-reciprocal nodes, and avoids unnecessary uplink beam management and resource waste.

[0035] Optionally, the uplink TCI status list is also used to indicate at least one of the following:

[0036] The downlink TCI state associated with each of the third TCI states;

[0037] Spatial relationship information parameters associated with each of the fourth TCI states.

[0038] Therefore, the network device can indicate the associated downlink TCI state for the first type of TCI state, so that the terminal can determine the corresponding uplink beam pointing to the first TRP based on the reciprocity beam, and indicate the associated spatial relationship information parameters for the second type of TCI state, so that the terminal can point to the corresponding uplink beam pointing to the second TRP based on the spatial relationship information parameters, thus ensuring the accuracy of beam generation.

[0039] Optionally, the method further includes:

[0040] The downlink TCI state list is determined to include the downlink TCI state associated with each of the third TCI states. The TCI mapping table of the MAC layer is updated. The TCI mapping table is used to indicate the downlink TCI state associated with each of the third TCI states, and / or the spatial relationship information parameters associated with each of the fourth TCI states.

[0041] If it is determined that the downlink TCI states associated with the third TCI state include downlink TCI states outside the downlink TCI state list, a third message is sent to the network device, the third message being used to indicate configuration failure.

[0042] Therefore, the terminal can verify whether the downlink TCI state list contains the downlink TCI state associated with the third TCI state. If it does, the MAC layer mapping table is updated; otherwise, a configuration failure is reported. A configuration verification mechanism is provided to ensure the integrity and consistency of TCI states, preventing communication anomalies caused by configuration errors. This resolves potential logical errors or omissions in TCI configuration, improving the system's reliability and robustness.

[0043] Optionally, the method further includes:

[0044] Receive the fourth information sent by the network device;

[0045] Based on the fourth information, at least one TCI state in the uplink TCI state list is activated and a first mapping relationship is determined, the first mapping relationship being used to indicate the TCI code point associated with each activated TCI state.

[0046] Therefore, network devices can send fourth information to terminals to activate certain states in the uplink TCI state list and establish a mapping relationship between them and TCI code points. This enables dynamic activation and mapping of TCI states, supporting fast beam indication during scheduling. It solves the problem of a large number of TCI states but a limited number of code points, achieving an efficient beam scheduling mechanism.

[0047] Optionally, the method includes:

[0048] Receive the fifth information sent by the network device, the fifth information including the first TCI code point;

[0049] Based on the first mapping relationship, determine the fifth TCI state associated with the first TCI code point;

[0050] The uplink beam is determined based on the fifth TCI state.

[0051] Therefore, the terminal can find the corresponding TCI state based on the TCI code point in the fifth information through the mapping relationship, and determine the uplink beam accordingly. This realizes dynamic beam indication, solves the problems of insufficient beam scheduling and slow response in the existing mechanism, and improves the uplink's adaptive capability and transmission efficiency.

[0052] Optionally, determining the uplink beam based on the fifth TCI state includes:

[0053] The fifth TCI state is determined to be associated with the sixth TCI state. The uplink beam is determined based on the quasi-co-address source of the downlink beam corresponding to the sixth TCI state. The sixth TCI state is any TCI state among the first TCI states.

[0054] The fifth TCI state is determined to be associated with the second spatial relationship information parameter, and the uplink beam is determined based on the second spatial relationship information parameter.

[0055] Therefore, if the TCI state is associated with the downlink TCI state, its quasi-co-located source is reused to determine the uplink beam; if it is associated with spatial relationship information parameters, the uplink beam is determined accordingly. This achieves transparent switching between the two beam determination mechanisms: reusing the downlink beam in reciprocal scenarios and relying on independent spatial indications in non-reciprocal scenarios. This solves the problem of the UE's inability to flexibly select beam generation methods during dynamic scheduling, ensuring beam accuracy and system efficiency under different transmission paths.

[0056] A second aspect of this application provides a communication method executed by a network device, the network device including a first transmission receiving point (TRP) and a second TRP, the first TRP being used to send downlink messages and receive uplink messages, and the second TRP being used only to receive uplink messages, the method comprising:

[0057] Broadcast first information, the first information including a first random access channel RACH resource configuration associated with a first synchronization signal block (SSB) set, and a second RACH resource configuration associated with a second SSB set;

[0058] Wherein, the first RACH resource configuration is used by the terminal to initiate random access using the first uplink beam when it is determined that the SSB with the highest signal strength belongs to the first SSB set, and the first uplink beam points to the first TRP;

[0059] The second RACH resource configuration is used by the terminal to initiate random access using the second uplink beam when it determines that the SSB with the highest signal strength belongs to the second SSB set, and the second uplink beam points to the second TRP.

[0060] Optionally, the first uplink beam is determined based on channel reciprocity;

[0061] The second RACH resource configuration includes a first spatial relationship information parameter, and the second uplink beam is determined based on the first spatial relationship information parameter.

[0062] Optionally, the method further includes:

[0063] Send a first channel state information reference signal (CSI-RS) to the terminal, wherein the first CSI-RS points to the receiving area of ​​the second TRP;

[0064] The first spatial relationship information parameter is associated with the first CSI-RS.

[0065] Optionally, the method further includes:

[0066] Based on the capabilities of the first TRP, a boundary parameter is determined, which is used to determine the first SSB set and the second SSB set;

[0067] The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter;

[0068] The index of an SSB in the first SSB set is less than or equal to the boundary parameter;

[0069] The index of an SSB in the second SSB set is greater than the boundary parameter.

[0070] Optionally, the method further includes:

[0071] Once it is determined that the terminal has completed initial access and entered the Radio Resource Control (RRC) connection state, the second information is sent to the terminal;

[0072] The second information includes at least one of the following:

[0073] The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal.

[0074] Downlink TCI status list;

[0075] Uplink TCI status list;

[0076] The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

[0077] Optionally, the downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-located source of the downlink beam corresponding to each first TCI state.

[0078] Optionally, the uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status;

[0079] The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type.

[0080] The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

[0081] Optionally, the uplink TCI status list is also used to indicate at least one of the following:

[0082] The downlink TCI state associated with each of the third TCI states;

[0083] Spatial relationship information parameters associated with each of the fourth TCI states.

[0084] Optionally, the method further includes:

[0085] A fourth message is sent to the terminal, the fourth message being used to instruct the terminal to activate at least one TCI state in the uplink TCI state list and determine a first mapping relationship, the first mapping relationship being used to indicate the TCI code point associated with each activated TCI state.

[0086] Optionally, the method includes:

[0087] The terminal sends a fifth message, which includes a first TCI code point. The first TCI code point is used by the terminal to determine the fifth TCI state and determine the uplink beam based on the fifth TCI state.

[0088] Optionally, the uplink beam is determined based on a quasi-co-located source of the downlink beam corresponding to a sixth TCI state associated with the fifth TCI state, wherein the sixth TCI state is any TCI state among the first TCI states; or,

[0089] The uplink beam is determined based on the second spatial relationship information parameters associated with the fifth TCI state.

[0090] A third aspect of this application provides a communication device, comprising: a module for performing the method as described in the first aspect, or a module for performing the method as described in the second aspect.

[0091] A fourth aspect of this application provides a communication device, including at least one processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices besides the communication device and transmit them to the processor, or to send signals from the processor to other communication devices besides the communication device, the processor being configured to implement the method as described in the first or second aspect via logic circuits or execution code instructions.

[0092] A fifth aspect of this application provides a communication system including a terminal and a network device, wherein the terminal is configured to implement the communication method described in the first aspect, and the network device is configured to implement the communication method described in the second aspect.

[0093] A sixth aspect of this application provides a non-transitory computer-readable storage medium including a computer program or instructions that, when executed on a computer, cause the computer to perform the method described in the first or second aspect.

[0094] A seventh aspect of this application provides a chip system including a processor;

[0095] The processor is configured to execute computer execution instructions to cause a device on which the chip system is mounted to perform the method as described in the first or second aspect.

[0096] The eighth aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the method described in the first or second aspect.

[0097] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0098] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0099] Figure 1 This is a schematic diagram of the architecture of a communication system according to an embodiment of this application.

[0100] Figure 2 This is an interactive schematic diagram illustrating a communication method according to an exemplary embodiment of this application.

[0101] Figure 3 This is an interactive schematic diagram illustrating a communication method according to an exemplary embodiment of this application.

[0102] Figure 4 This is a flowchart illustrating a communication method according to an exemplary embodiment of this application.

[0103] Figure 5 This is a schematic block diagram of a communication device according to an exemplary embodiment of this application.

[0104] Figure 6 This is a schematic block diagram of a communication device according to an exemplary embodiment of this application.

[0105] Figure 7 This is a schematic block diagram of a communication device according to an exemplary embodiment of this application. Detailed Implementation

[0106] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0107] It should also be understood that the term "and / or" used in this application specification and appended claims is a description of 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, and B exists alone.

[0108] As used in this application specification and the appended claims, the terms "if" or "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0109] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0110] References to "one embodiment" or "some embodiments" in the embodiments described in this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0111] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0112] Furthermore, the term "multiple" mentioned in the embodiments of this application should be interpreted as two or more; the terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0113] In this application, the terms "information," "signal," "message," "channel," and "signaling" may sometimes be used interchangeably. It should be noted that, without emphasizing their distinction, their intended meanings are consistent. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing their distinction, their intended meanings are consistent. Furthermore, the " / " mentioned in this application can be used to indicate an "or" relationship.

[0114] It is understood that in this application, "instruction" can include direct instruction, indirect instruction, explicit instruction, and implicit instruction. When describing a certain instruction information to indicate A, it can be understood that the instruction information carries A, directly indicates A, or indirectly indicates A.

[0115] In this application, the information indicated by the instruction information can be referred to as the information to be instructed. In specific implementations, there are many ways to instruct the information to be instructed, such as, but not limited to, directly instructing the information to be instructed, such as the information to be instructed itself or its index; indirectly instructing the information to be instructed by instructing other information, where there is a relationship between the other information and the information to be instructed; or instructing only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol-defined) arrangement of various pieces of information, thereby reducing instruction overhead to some extent.

[0116] The information to be instructed can be sent as a whole or divided into multiple sub-information messages, and the sending period and / or timing of these sub-information messages can be the same or different. This application does not limit the specific sending method. The sending period and / or timing of these sub-information messages can be predefined, for example, according to a protocol, or configured by the transmitting device by sending configuration information to the receiving device.

[0117] It is understood that "send" and "receive" in this application refer to the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which can include direct transmission via the air interface or indirect transmission via the air interface from other units or modules. "Receive information from YY" can be understood as the source of the information being YY, which can include direct reception from YY via the air interface or indirect reception from YY via the air interface from 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.

[0118] 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.

[0119] 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.

[0120] The communication method provided in this application can be applied to various communication systems. These include: Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE... 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0121] Figure 1 This is a schematic diagram of the architecture of a communication system according to an embodiment of this application. Figure 1 As shown, the communication system 100 includes a terminal 101 and a network device 102.

[0122] In some embodiments, network device 102 can be a device that makes decisions and processes terminal 101. For example, network device 102 can perform resource scheduling, such as allocating resources to terminal 101 so that terminal 101 can perform data transmission or measurement. Network device 102 in this application may include network-side devices such as access network devices and core network devices. Access network devices are sometimes also called access nodes. Access network devices have wireless transceiver capabilities and are used to communicate with terminals. Access network devices include, but are not limited to, base stations, evolved NodeBs (eNodeBs), transmission reception points (TRPs) in the above-mentioned communication systems, next-generation NodeBs (gNBs) in 5G mobile communication systems, access network devices or modules of access network devices in open RAN (ORAN) systems, satellites in non-terrestrial network (NTN) communication systems, base stations in future mobile communication systems, or access nodes in WiFi systems. Access network devices may also be modules or units capable of implementing some of the functions of a base station. Access network equipment can be macro base stations, micro base stations, indoor stations, relay nodes, master nodes, or wireless controllers in cloud radio access network (CRAN) scenarios. Optionally, access network equipment can also be servers, wearable devices, or vehicle-mounted devices. For example, in vehicle-to-everything (V2X) technology, the access network equipment can be a roadside unit (RSU). Multiple access network devices in a communication system can be base stations of the same type or different types. Base stations can communicate with terminals directly or via relay stations. Terminals can communicate with multiple base stations using different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in the access network equipment.

[0123] In this application, the means for implementing the functions of a network device can be a network device itself, or a means capable of supporting the network device in implementing those functions, such as a processor, circuit, chip, or chip system. This means can be installed in or connected to the network device. In the technical solutions provided in this application, the example of a network device being used to implement the functions of a network device is used to describe the technical solutions provided in this application.

[0124] The terminal 101 in this application can be a wireless terminal device capable of receiving network device scheduling and instruction information. The wireless terminal device can be a device providing voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem. For example, the terminal can communicate with one or more core networks or the Internet via a radio access network (RAN). The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), ultra-reliable low-latency communication (URLLC), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, or satellite communication, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, aircraft (such as drone, helicopter, airplane), hot air balloon, ship, robot, robotic arm, or smart home device, etc. The embodiments of this application do not limit the form of the terminal device.

[0125] In this application, the apparatus for implementing the functions of a terminal device can be the terminal device itself, or any apparatus capable of supporting the terminal device in implementing those functions, such as a processor, circuit, chip, or chip system. This apparatus can be installed in or connected to the terminal device. In the technical solutions provided in this application, the example of a terminal device being used to implement the functions of a terminal device is used to describe the technical solutions provided in this application.

[0126] Access network equipment and / or terminal equipment can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. This application does not limit the application scenarios of the access network equipment and terminal equipment. They can be deployed in the same or different scenarios; for example, both can be deployed on land simultaneously; or the access network equipment can be deployed on land while the terminal equipment is deployed on water, etc., and these examples will not be listed here.

[0127] In practical applications, multiple network devices can collaborate to assist terminal devices in achieving wireless access, with different network devices each implementing a portion of the base station's functions. For example, network devices can be central units (CUs), distributed units (DUs), CU-control plane (CPs), CU-user plane (UPs), or radio units (RUs), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio frequency equipment or radio frequency units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0128] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (Open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules. CU (or CU-CP and CU-UP), DU, and RU can implement different protocol layer functions.

[0129] To cost-effectively improve uplink performance when downlink performance is already sufficient, the industry has proposed an "asymmetric DL sTRP / UL mTRP deployment scenario." In this scenario, the network architecture consists of two physically non-co-located node (TRP) types: one is a transceiver point (DL / ULTRP) capable of transmitting both downlink and uplink signals, and the other is an uplink-only TRP capable of receiving only uplink signals. Both are typically assumed to have ideal backhaul connectivity and operate on the same bandwidth. This deployment aims to enhance uplink coverage using UL-only TRPs while reusing the downlink coverage of DL / UL TRPs.

[0130] Reference Figure 1As shown in this application, the network device 102 may include a first TRP 112 and a second TRP 122. The first TRP 112 may be a transceiver point (DL / UL TRP) that can transmit downlink (DL) signals and receive uplink (DL) signals. The second TRP 122 may be an uplink-only TRP that can only receive uplink signals. The first TRP 112 and the second TRP 122 have an ideal backhaul connection and operate on the same bandwidth.

[0131] In some embodiments, the network device 102 may also include a plurality of second TRPs 122, that is, a plurality of transmission points that can only receive uplink signals.

[0132] However, existing protocol mechanisms face significant challenges in dealing with the complexities of such asymmetric deployments, primarily in two key areas: robustness of initial access and resource efficiency of beam management.

[0133] First, during the initial access phase, the difference in physical location becomes a key factor affecting access performance. When the terminal (UE) is physically close to the UL-only TRP, if the conventional initial access mechanism is still used (i.e., the uplink and downlink beams are interchanged by default, pointing back to the DL / UL TRP), the terminal will choose a more distant path. This mismatch in path selection will directly lead to poor uplink quality, increased system interference, and increased access latency, failing to leverage the near-field reception advantages of the UL-only TRP.

[0134] Secondly, in Radio Resource Control (RRC) connected mode, the existing Transmission Configuration Indication (TCI) framework is inefficient. The current separate TCI mode is designed based on the assumption that downlink and uplink beams are completely non-reciprocal. This means that even for DL / UL TRPs that are inherently beam-reciprocal, the base station is forced to maintain a separate uplink beam. This rigidity in the mechanism leads to "unnecessary uplink beam management" and significant "resource consumption."

[0135] This demonstrates that existing mechanisms cannot maintain high efficiency while distinguishing between reciprocal and non-reciprocal nodes. Therefore, there is an urgent need to conduct in-depth research on an enhanced TCI mode for asymmetric deployments. By optimizing the initial access logic and reconstructing the TCI state framework, the system can achieve optimal path selection and resource utilization under different TRP deployment conditions, ensuring the efficient and stable operation of the communication system.

[0136] To at least address the aforementioned problems, embodiments of this application provide a communication method. The communication method provided by embodiments of this application will be described below with reference to the accompanying drawings.

[0137] Figure 2 This is an interactive schematic diagram illustrating a communication method according to an exemplary embodiment of this application. This communication method can be applied to, for example... Figure 1 The communication system shown. (As shown) Figure 2 As shown, the communication method includes:

[0138] S201, Network device broadcasts first information.

[0139] In some embodiments, the network device includes a first TRP and a second TRP, wherein the first TRP is used to send downlink messages and receive uplink messages, and the second TRP is used only to receive uplink messages.

[0140] The network device may be the first information broadcast through the first TRP.

[0141] In some embodiments, the first TRP is a transceiver point that can transmit downlink signals and receive uplink signals, while the second TRP is an uplink transmission point that can only receive uplink signals sent by the terminal.

[0142] In some possible implementations, the first information is used to indicate the Random Access Channel (RACH) resource configuration. Optionally, the first information may be used to indicate the time-frequency domain location of the RACH resource.

[0143] In some embodiments, the first indication is used to indicate at least two RACH resource configurations, with different RACH resource configurations associated with different synchronization signal blocks (SSBs). Optionally, different RACH resource configurations may be associated with different sets of SSBs, and different sets of SSBs may include different SSBs.

[0144] In the embodiments of this application, the terms "RACH" and "Physical Random Access Channel (PRACH)" can be used interchangeably.

[0145] The terms "synchronization signal block (SSB)" and "synchronization signal and physical broadcast channel block (SSB)" are interchangeable.

[0146] In one possible implementation, the first information includes a first RACH resource configuration and a second RACH resource configuration. Optionally, the RACH resource configuration may include the first RACH resource configuration and the second RACH resource configuration. The first RACH resource configuration is associated with a first SSB set, and the second RACH configuration is associated with a second SSB set.

[0147] For example, SSB set 1 associated with RACH resource configuration 1 includes SSB#0, SSB#1, SSB#2...SSB#47, SSB#48, and SSB set 2 associated with RACH resource configuration 2 includes SSB#49, SSB#50, SSB#51...SSB#62, SSB#63, SSB#64.

[0148] In some embodiments, the first SSB set and the second SSB set can be determined based on a boundary parameter, wherein the index of the SSB in the first SSB set can be less than or equal to the boundary parameter, and the index of the SSB in the second SSB set can be greater than the boundary parameter.

[0149] For example, if the SSB index range configured for the network device is 1-64 and the delimiter parameter is 48, then the first RACH resource configuration can be associated with the SSB with index 1-48, and the second RACH resource configuration can be associated with the SSB with index 49-67.

[0150] In some embodiments, the boundary parameter is positively correlated with the ability of the first TRP to receive uplink messages. Optionally, the stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter.

[0151] It is understandable that the ability of the first TRP to receive uplink messages can be related to its own transmit power level and effective coverage radius dynamics. Correspondingly, the boundary parameter can also be related to the transmit power level and effective coverage radius dynamics of the first TRP.

[0152] In some embodiments, the protocol can define demarcation parameters corresponding to different types of first TRPs, with different types of first TRPs having different capabilities to receive uplink messages. The network device can determine the demarcation parameters and the first SSB set and the second SSB set based on the type of the first TRP.

[0153] For example, the type corresponding to the first TRP can include a wide-coverage macro station, a mid-range micro station, and a blind spot filler or indoor station. Among them, the wide-coverage macro station has the strongest ability to receive uplink messages, while the blind spot filler or indoor station has the weakest ability to receive uplink messages. The protocol can pre-define the boundary parameter for the wide-coverage macro station as 48, the boundary parameter for the mid-range micro station as 32, and the boundary parameter for the blind spot filler or indoor station as 16. That is, if the first TRP is a mid-range micro station, the network device can determine that the first SSB set includes SSBs with indices 1-32, and the second SSB set includes SSBs with indices 33-64, and associate the first RACH resource configuration and the second RACH resource configuration with the first SSB set and the second SSB set, respectively.

[0154] In some embodiments, the SSBs in the first SSB set can be referred to as the SSBs corresponding to the self-governed region, and the SSBs in the second SSB set can be referred to as the SSBs corresponding to the cooperative region.

[0155] In some embodiments, the network device may instruct at least one of the following simultaneously, between, or after sending the first RACH resource configuration and the second RACH resource configuration via the first information:

[0156] The type corresponding to the first TRP;

[0157] The SSB associated with the first RACH resource configuration;

[0158] The second RACH resource configuration associated with the SSB;

[0159] Boundary parameters.

[0160] The aforementioned information can be used by the terminal to determine the SSBs associated with the first RACH resource configuration and the second RACH resource configuration, respectively. That is, when the network device indicates the first and second RACH resource configurations, the SSBs associated with the first RACH resource configuration (i.e., the first set of SSBs) and the SSBs associated with the second RACH resource configuration (i.e., the second set of SSBs) are unknown to the terminal. Therefore, the network device needs to provide appropriate instructions so that the terminal can learn the SSBs associated with each of the two RACH resource configurations, thereby ensuring that the terminal can reliably initiate random access.

[0161] To enable terminals to know the SSB associated with the first RACH resource configuration and the SSB associated with the second RACH resource configuration, network devices can add corresponding fields to the configuration for direct indication when indicating the first RACH resource configuration and / or the second RACH resource configuration. Alternatively, they can directly indicate the SSB associated with the first RACH resource configuration and the SSB associated with the second RACH resource configuration using information other than the first information. Or, they can indirectly indicate the SSB associated with the first RACH resource configuration and the SSB associated with the second RACH resource configuration by indicating the type or demarcation parameter corresponding to the first TRP (such as using the first information or information other than the first information).

[0162] For example, the first RACH resource configuration may include a field or information field for indicating the first SSB set, such as indicating the index of the SSB with the highest index in the first SSB set (e.g., 48); and / or, the second RACH resource configuration may include a field or information field for indicating the second SSB set.

[0163] Accordingly, the terminal can determine the SSBs included in the first SSB set and / or the second SSB set based on the first RACH resource configuration and / or the second RACH resource configuration.

[0164] It is understandable that if the RACH resource configuration only includes the first RACH resource configuration and the second RACH resource configuration, after the terminal learns the SSBs included in the first SSB set, the other SSBs can be identified as SSBs included in the second SSB set.

[0165] In another example, the first information may include a field or information field parallel to the first RACH resource configuration and the second RACH resource configuration, for indicating the first SSB set and / or the second SSB set, or for indicating the demarcation parameter, or for indicating the type corresponding to the first TRP.

[0166] Accordingly, the terminal can determine the SSBs included in the first SSB set and / or the second SSB set based on the above fields or the above information fields.

[0167] In some embodiments, after the network device indicates the first RACH resource configuration and the second RACH resource configuration, the terminal can know the two sets of RACH resource configurations configured by the network device and the SSB associated with each of the two sets of RACH resource configurations. The terminal can also further determine which of the two sets of RACH resource configurations is the first RACH resource configuration and which is the second RACH resource configuration.

[0168] In one implementation, the terminal can determine which of the two RACH resource configurations is the first RACH resource and which is the second RACH resource based on the index size of the SSB associated with the RACH resource configuration. For example, if the terminal determines that the SSB with the largest index value associated with RACH resource configuration 1 has an index of 48, while the SSB with the smallest index value associated with RACH resource configuration 2 has an index of 49, then RACH resource configuration 1 can be determined as the first RACH resource configuration and RACH resource configuration 2 as the second RACH resource configuration.

[0169] In another implementation, the terminal can determine whether the RACH resource configuration is a first RACH resource configuration or a second RACH resource configuration by judging whether the RACH resource configuration includes a first spatial relationship information parameter.

[0170] In some embodiments, the first RACH resource configuration does not include the first spatial relationship information parameter, while the second RACH resource configuration may include the first spatial relationship information parameter.

[0171] Optionally, the first spatial relationship information parameter is used to instruct the terminal to initiate random access using the second uplink beam. The first spatial relationship information is associated with the first channel state information-reference signal (CSI-RS), and the first CSI-RS points to the receiving area of ​​the second TRP.

[0172] For example, the first spatial relationship information may be the reference signal identifier corresponding to the first CSI-RS, such as the CSI-RS index, or the beam identifier corresponding to the first CSI-RS, or the quasi-co-address information corresponding to the first CSI-RS, etc.

[0173] Before broadcasting the first information, the network device can first send multiple CSI-RSs, at least one of which points to the second TRP. When broadcasting the first information, the network device can additionally configure a first spatial relationship information parameter in the second RACH resource configuration, so that when the terminal determines to initiate random access using the second RACH resource configuration, it can determine the CSI-RS pointing to the second TRP (such as the first CSI-RS) based on the first spatial relationship information parameter and determine the corresponding uplink beam.

[0174] It is worth noting that after the network device indicates two or more RACH resource configurations, the terminal does not need to determine which RACH resource configuration is the first RACH resource configuration or the second RACH resource configuration. That is, the first RACH resource configuration and the second RACH resource configuration are just names defined to facilitate the distinction between the two RACH resource configurations. For the terminal, it only needs to execute the corresponding program according to the content or parameters in the configuration.

[0175] For example, after configuring a first RACH resource configuration or a second RACH resource configuration, in step S202, when the terminal determines that the SSB with the highest signal strength belongs to a certain SSB set, it can activate the RACH resource configuration corresponding to that SSB set and determine the corresponding beam to initiate random access based on the RACH resource configuration. For instance, if the RACH resource configuration includes first spatial relationship information, the terminal can determine the second uplink beam based on the first spatial relationship information and use the second uplink beam to initiate random access. Alternatively, if the RACH resource configuration does not include first spatial relationship information, the terminal can determine the corresponding first uplink beam based on the RACH resource configuration and use the first uplink beam to initiate random access. In this case, the terminal can achieve the purpose of configuring the corresponding RACH resource configuration without needing to know whether the activated RACH resource configuration is the first or the second RACH resource configuration. For example, the purpose of configuring the second RACH resource configuration is to enable the terminal to send uplink messages (such as random access related messages) to the second TRP when the first TRP may not reliably receive the uplink messages sent by the terminal.

[0176] In some embodiments, the network device may broadcast SSB within its coverage area before, simultaneously with, or after broadcasting the first information. The SSB can be used for terminal pre-synchronization and beam measurement, etc.

[0177] In some embodiments, the first information may be a system message block SIB1. Optionally, the name of the first information is not limited, and may be, for example, "SIB1", "RACH resource configuration information", etc.

[0178] S202, the terminal initiates random access based on the first RACH configuration or the second RACH configuration.

[0179] In some embodiments, before initiating random access, the terminal listens to the SSBs sent by the network device and determines the SSB with the highest signal strength, such as the SSB with the highest RSRP. Further, based on the SSB with the highest signal strength, it determines whether to initiate random access according to a first RACH resource configuration or a second RACH resource configuration.

[0180] The network device can be an SSB sent via the first TRP.

[0181] In some embodiments, when the terminal determines that the SSB with the highest signal strength belongs to the first SSB set, it initiates random access according to the first RACH resource configuration. The terminal uses a first uplink beam to initiate random access, and the first uplink beam points to the first TRP. Optionally, the terminal may determine the first uplink beam based on channel reciprocity.

[0182] In some embodiments, the terminal uses a first uplink beam to send Msg1 and / or Msg3 (or MsgA) to the first TRP.

[0183] In other words, when the terminal determines that the SSB with the highest signal strength belongs to the first SSB set, it can determine the uplink beam used in the random access process as the beam pointing to the first TRP based on the RACH resource configuration associated with the first SSB set.

[0184] For example, if the terminal determines that the SSB with the highest signal strength is index 32, belonging to the first SSB set, it can initiate random access based on the RACH resource configuration associated with the first SSB set. This RACH resource configuration does not include the first spatial relationship information parameter. Based on channel reciprocity, the terminal can determine the beam reciprocal with the transmit beam of the SSB with the highest signal strength as the first uplink beam, and send uplink messages related to random access, such as Msg1, Msg3, and MsgA, to the network device based on this first uplink beam. Since the first uplink beam is reciprocal with the transmit beam of the SSB with the highest signal strength, this first uplink beam points to the first TRP.

[0185] In some embodiments, when the terminal determines that the SSB with the highest signal strength belongs to the second SSB set, it initiates random access according to the second RACH resource configuration. The terminal uses a second uplink beam to initiate random access, and the second uplink beam points to the second TRP. Optionally, the terminal may determine the second uplink beam based on the first spatial relationship information parameters included in the second RACH resource configuration.

[0186] In some embodiments, the terminal uses a second uplink beam to send Msg1 and / or Msg3 to the second TRP (or sends MsgA when using 2-step random access).

[0187] In other words, when the terminal determines that the SSB with the highest signal strength belongs to the second SSB set, it can determine the uplink beam used during random access as the beam pointing to the second TRP based on the RACH resource configuration associated with the second SSB set.

[0188] For example, if the terminal determines that the SSB with the highest signal strength is index 52, belonging to the second SSB set, it can initiate random access based on the RACH resource configuration associated with the second SSB set. This RACH resource configuration includes a first spatial relationship information parameter. Based on this parameter, the terminal can determine the first CSI-RS pointing to the second TRP, and identify the beam whose transmit beam is reciprocal with that of the first CSI-RS as the second uplink beam. Based on this second uplink beam, the terminal sends uplink messages related to random access, such as Msg1, Msg3, and MsgA, to the network device. Since the second uplink beam is reciprocal with the transmit beam of the first CSI-RS, and the first CSI-RS points to the second TRP, the second uplink beam also points to the second TRP.

[0189] Furthermore, after receiving Msg1, the second TRP notifies the first TRP via an ideal backhaul. The first TRP then sends Msg2 via the downlink. When the terminal sends Msg3, it continues to use the second uplink beam, thus successfully anchoring the uplink path to the second TRP, thereby resolving the access interference and delay issues for far-field users.

[0190] In some embodiments, after a terminal initiates random access, the network device can determine whether to allow the terminal to access. Optionally, if the network device determines to allow the terminal to access, it can send corresponding indication information or configuration information (such as an RRC reconfiguration message) to cause the terminal to enter the RRC connected state.

[0191] In some embodiments, after a terminal enters the RRC connection state, the network device can configure the terminal for the RRC connection state. For example, it can configure subsequent uplink beams, downlink beams, uplink TCI status lists, downlink TCI status lists, etc.

[0192] Compared to existing technologies, this new technology assumes, without distinction, that all SSBs and Msg1 are beam reciprocal during initial access, and always initiates access to the TRP that sends the SSB. Furthermore, existing SSB configurations typically do not differentiate between "near field" and "far field".

[0193] In this application embodiment, a joint mechanism combining network-side dynamic partitioning and UE-side L1 coverage is proposed. The network side dynamically determines the boundary parameter N based on its own coverage capabilities (macrocell / microcell), dividing the SSB into self-managed areas (A) and cooperative areas (B), and explicitly configures spatialRelationInfo pointing to the UL-only TRP for the cooperative areas in SIB1. When the UE L1 layer detects this parameter, it executes the coverage (Override) logic, ignoring the default reciprocity.

[0194] Since the SSB index essentially corresponds to the beam pointing in physical space, by strongly binding the SSB index pointing to the remote area with the PRACH configuration pointing to the UL-only TRP, and introducing the conditional coverage logic of the UE L1 layer, the downlink synchronization source (SSB) and the uplink transmission direction (Msg1) are successfully decoupled in a specific area, thereby realizing an asymmetric access path.

[0195] This solution addresses the issues of poor uplink quality, high interference, and large access latency caused by "far-field users" physically located near the UL-only TRP blindly initiating access to the main base station (DL / UL TRP) in asymmetric deployment scenarios. It also resolves the problem that fixed partitioning strategies cannot adapt to base stations with different power levels.

[0196] Through intelligent access point selection, the UE can automatically select the optimal uplink access point (DL TRP or UL TRP) based on its physical location even in RRC Idle Mode. By dynamically adjusting the boundary parameter N, the same solution can be adapted to various scenarios, from wide-coverage macro base stations to fill-in-the-gap micro base stations, maximizing the utilization of base station resources.

[0197] Based on an overall inventive concept, in order to solve the signaling redundancy and resource waste caused by ignoring beam reciprocity when processing DL / ULTRP in scenarios where TRPs are not co-located in the prior art, this application further provides the following embodiments.

[0198] Figure 3 This is an interactive schematic diagram illustrating a communication method according to an exemplary embodiment of this application. This communication method can be applied to, for example... Figure 1 The communication system shown. (As shown) Figure 3 As shown, the communication method includes:

[0199] S301, the network device determines that the terminal has completed the initial access and entered the RRC connection state, and sends the second information to the terminal.

[0200] In some embodiments, the terminal may be via Figure 2 The initial access can be performed using the optional implementation shown in the embodiments, or other access methods can be used. This application does not limit the specific implementation methods.

[0201] For example, the terminal can initiate random access using the first uplink beam according to the first RACH resource configuration when it is determined that the SSB with the highest signal strength belongs to the first SSB set by executing steps S201 to S202, or initiate random access using the second uplink beam according to the second RACH resource configuration when it is determined that the SSB with the highest signal strength belongs to the second SSB set.

[0202] Alternatively, the terminal can initiate random access in other ways. For example, if the network device is configured with only one set of RACH resource configuration, the terminal can initiate random access based on the beam corresponding to that configuration.

[0203] In some embodiments, the network device may, by default, allow the terminal to complete initial access and enter the RRC connection state after sending Msg4 to the terminal to indicate that the terminal has entered the RRC connection state. Optionally, the network device may also determine that the initial access has been completed and the terminal has entered the RRC connection state upon receiving indication information sent by the terminal indicating that the terminal has completed initial access and entered the RRC connection state.

[0204] In some embodiments, the second information includes at least one of the following:

[0205] The first indication information is used to indicate the Transmission Configuration Indicator (TCI) status management mode adopted by the serving cell of the terminal.

[0206] Downlink TCI status list;

[0207] Uplink TCI status list;

[0208] The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam and the uplink TCI status list is used by the terminal to determine the uplink beam.

[0209] In some embodiments, the above-mentioned TCI status management mode may also include modes other than the first mode. For example, in the second mode, the terminal may determine the uplink beam and downlink beam based on only one TCI status list. In this case, the uplink TCI status list or downlink TCI status list in the second information may be omitted, or the downlink TCI status list and the uplink TCI status list may be merged into one list.

[0210] In some embodiments, the downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-located source of the downlink beam corresponding to each first TCI state.

[0211] It is understandable that each TCI state in the downlink TCI state list can correspond to a downlink beam, and these downlink beams can all be indicated by the first TRP, that is, when the network device sends downlink messages, it sends them through the first TRP.

[0212] For example, before sending the second information, the network device may send one or more reference signals (such as CIS-RS, SSB, etc.) to the terminal. For a certain first TCI state, the network device may indicate the quasi-co-addressable source corresponding to the downlink beam of the first TCI state, such as the corresponding CSI-RS or SSB. That is, the downlink beam corresponding to the first TCI state is quasi-co-addressable with the downlink beam corresponding to a certain reference signal. If the terminal receives a downlink message based on the first TCI state, it can receive the downlink message in the beam direction corresponding to the reference signal.

[0213] In some embodiments, the uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status.

[0214] The configuration types include a first type and a second type. The second TCI state includes at least one of a third TCI state and a fourth TCI state. The third TCI state corresponds to the first type, and the fourth TCI state corresponds to the second type.

[0215] The uplink beam, determined based on the third TCI state, points to the first TRP, and the uplink beam, determined based on the fourth TCI state, points to the second TRP.

[0216] In other words, the uplink TCI state list can include two types of TCI states: the third TCI state and the fourth TCI state. If the terminal determines the uplink beam based on the third TCI state, then that uplink beam points to the first TRP; if the terminal determines the uplink beam based on the fourth TCI state, then that uplink beam points to the second TRP. Thus, the terminal can configure different types of TCI states...

[0217] For example, for each TCI state in the uplink TCI state list, a corresponding beamSource field can be configured. When the field corresponds to linkedBeam, it can be determined that the configuration type of the TCI state is the first type and the TCI state is the third TCI state. When the field corresponds to independentBeam, it can be determined that the configuration type of the TCI state is the second type and the TCI state is the fourth TCI state.

[0218] In some embodiments, the uplink TCI status list is also used to indicate at least one of the following: the downlink TCI status associated with each third TCI status; and the spatial relationship information parameters associated with each fourth TCI status.

[0219] Each third TCI state can be associated with a first TCI state in the downlink TCI list, and each fourth TCI state can be associated with a spatial relationship information parameter. A spatial relationship information parameter can be associated with a reference signal, which can be a reference signal configured by the network device to point to the second TRP. In other words, the uplink beam corresponding to the third TCI state is a beam associated with the downlink beam, while the uplink beam corresponding to the fourth TCI state can be an independently configured beam pointing to the second TRP.

[0220] In this way, the terminal can determine the uplink beam corresponding to each third TCI state based on the first TCI state associated with each third TCI state, and determine the uplink beam corresponding to each fourth TCI state based on the spatial relationship information parameters associated with each fourth TCI state. This ensures that the uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

[0221] For example, for each TCI state in the uplink TCI state list, the corresponding beamSource field can be configured. When the field corresponds to linkedBeam, the downlink TCI state associated with the TCI state (such as DL TCI-StateId) can be further configured. When the field corresponds to independentBeam, the spatial relationship information parameters associated with the TCI state (such as SpatialRelationInfo or CSI-RS ID) can be further configured.

[0222] Specifically, the uplink TCI state list (TCI-UL-State-r19) can be seen as follows:

[0223] TCI-UL-State-r19::=SEQUENCE{

[0224] tci-StateId-r17……TCI-StateId,

[0225] beamSource-r19……CHOICE{

[0226] linkedBeam……TCI-StateId,

[0227] independentBeam…patialRelationInfo

[0228] }

[0229] }

[0230] It is worth noting that the TCI-StateId corresponding to the tci-StateId-r17 field can be the identifier of the TCI state in the uplink TCI state list, and the TCI-StateId corresponding to the linkedBeam field can be the identifier of the TCI state in the downlink TCI state list. The TCI states in the two lists can be identified independently.

[0231] In some embodiments, the second information may be an RRC reconfiguration message. Optionally, the second information is carried by an RRC reconfiguration message. Optionally, the second information is carried by a specific information element (IE) in the RRC reconfiguration message, or, part of the second information is carried by some information elements in the RRC reconfiguration message, and another part is carried by other information elements in the RRC reconfiguration message. This application does not limit this aspect.

[0232] In some embodiments, the first indication information may be carried by a ServingCellConfig information element or a Physical Downlink Shared Channel-Config (PDSCH-Config) information element.

[0233] For example, the ServingCellConfig or PDSCH-Config information element may include a unifiedTCI-StateType-r17 field. When the value of this field is "separate", it indicates that the terminal's current serving cell adopts a separate TCI state management mode (i.e., the first mode). In this case, the downlink beam and uplink beam will be defined by two separate lists (i.e., the downlink TCI state list and the uplink TCI state list), instead of using a single combined list.

[0234] In some embodiments, the downlink TCI status list may be indicated by a downlink portion bandwidth (BWP) configuration, such as by a BWP-DownlinkDedicated information element or a PDSCH-Config information element.

[0235] For example, the BWP-DownlinkDedicated information element or the PDSCH-Config information element may include the dl-OrJoint-TCIStateList-r17 field, which may contain multiple TCI states (such as TCI state identifiers), each of which defines the quasi-co-address source of the downlink receive beam.

[0236] In some embodiments, the uplink TCI status list may be indicated by the uplink BWP configuration, such as by the BWP-UplinkDedicated information element, the Physical Uplink Control Channel-Config (PUCCH-Config) information element, or the Physical Uplink Shared Channel-Config (PUCCH-Config) information element.

[0237] For the third TCI state in the uplink TCI state list, the network device can select the beamSource corresponding to this TCI state as linkedBeam and configure an identifier corresponding to a TCI state in the downlink TCI state list. When the terminal parses this configuration, it can establish the corresponding mapping relationship. When the subsequent downlink control information (DCI) activates this state, the terminal does not need to look up the independent uplink spatial parameters, but directly reads the relevant parameters in the corresponding downlink TCI state list, such as the corresponding quasi-co-located source, and reuses the beam corresponding to the quasi-co-located source as the uplink transmission beam.

[0238] For the fourth TCI state in the uplink TCI state list, the network device can select the beamSource corresponding to this TCI state as independentBeam and configure a spatial relationship information parameter. This spatial relationship information parameter can point to a Sounding Reference Signal (SRS) resource specifically used for uplink detection or a specific CSI-RS (such as CSI-RS-for-UL-TRP). When the terminal resolves this configuration, when the DCI subsequently activates this state, the terminal ignores the downlink beam and determines the uplink beam according to the reference signal indicated by the spatial relationship information parameter.

[0239] In some embodiments, after receiving the second information, the terminal may first verify the configuration corresponding to the second information. Optionally, if the verification passes, the TCI mapping table of the Media Access Control (MAC) layer may be updated. Optionally, if the verification fails, a third message may be sent to the network device to indicate that the configuration has failed.

[0240] In some embodiments, the TCI mapping table of the MAC layer can be used to indicate the downlink TCI state associated with each third TCI state, and / or the spatial relationship information parameters associated with each fourth TCI state. That is, the network device can store the list of uplink TCI states indicated by the second information in the TCI mapping table for subsequent use.

[0241] It is understandable that, since the third TCI state is associated with the downlink TCI state, the entry in the TCI mapping table that points to the first TRP is a virtual pointer to the downlink TCI state, while the entry that points to the first TRP is an entity configuration containing specific spatial parameters.

[0242] In some embodiments, the terminal can determine the validity of the configuration by determining whether the downlink TCI status list includes the downlink TCI status associated with each third TCI status.

[0243] In some embodiments, the terminal determines that the downlink TCI state list includes the downlink TCI state associated with each third TCI state, and updates the TCI mapping table of the MAC layer.

[0244] In some embodiments, if it is determined that the downlink TCI states associated with the third TCI state include downlink TCI states not included in the downlink TCI state list, third information is sent to the network device to indicate configuration failure.

[0245] For example, if the uplink TCI status list configured in the second information includes five third TCI statuses, which are respectively associated with downlink TCI statuses with TCI identifiers of 0, 1, 2, 3, and 4, then when the downlink TCI status list includes downlink TCI statuses with TCI identifiers of 0, 1, 2, 3, and 4, the configuration can be determined to be valid, and the TCI mapping table of the MAC layer can be updated; when the downlink TCI status list only includes downlink TCI statuses with TCI identifiers of 3 and 4, the configuration can be determined to be invalid, and the third information can be sent to the network device.

[0246] In some embodiments, the third information may be an RRC reconfiguration failure message.

[0247] In some embodiments, the network device may send updated second information to the terminal after receiving the third information.

[0248] In some embodiments, after determining that the configuration is valid and updating the TCI mapping table of the MAC layer, the terminal may also send corresponding indication information to the network device to indicate that the network device's configuration has taken effect. In this way, the network device can schedule the terminal based on the corresponding configuration when there is a corresponding scheduling requirement.

[0249] S302, the network device sends the fourth information to the terminal.

[0250] In some embodiments, the fourth information is used to instruct the terminal to activate at least one TCI state in the uplink TCI state list and determine a first mapping relationship. The first mapping relationship indicates the TCI code point associated with each activated TCI state.

[0251] In some embodiments, the fourth information can be used to instruct the terminal to activate all TCI states in the uplink TCI state list. Optionally, the fourth information can be used to instruct the terminal to activate some TCI states in the uplink TCI state list. The network device can determine which TCI states the terminal needs to activate based on actual requirements; this embodiment does not limit this.

[0252] In some embodiments, the fourth piece of information may be a Media Access Control Element (MAC CE).

[0253] In some embodiments, the fourth information includes a TCI status identifier corresponding to at least one TCI status in the uplink TCI status list, and a TCI code point associated with each TCI status identifier.

[0254] Understandably, since the TCI (Transmission Configuration Indication field) in DCI typically only has 3 bits (supporting 8 code points), while the TCI state list configured by RRC may contain as many as 64 or 128 states, network devices can activate a portion of the TCI states via MAC-CE (Media Access Control-Control Unit) signaling before DCI scheduling and map these TCI states onto the TCI code points in the DCI.

[0255] For example, the uplink TCI state list includes TCI state #0, TCI state #1, TCI state #2...TCI state #14, TCI state #15. The fourth information can instruct the terminal to activate TCI state #1, TCI state #2, TCI state #9, and TCI state #10. The TCI code point corresponding to TCI state #1 is 000, the TCI code point corresponding to TCI state #2 is 001, the TCI code point corresponding to TCI state #9 is 010, and the TCI code point corresponding to TCI state #10 is 011. That is, TCI code point 000 maps to TCI state with TCI state identifier 1, TCI code point 001 maps to TCI state with TCI state identifier 2, TCI code point 010 maps to TCI state with TCI state identifier 9, and TCI code point 011 maps to TCI state with TCI state identifier 10.

[0256] S303, the terminal activates at least one TCI state in the uplink TCI state list and determines the first mapping relationship based on the fourth information.

[0257] For example, if the fourth information indicates that the terminal activates TCI state #1, TCI state #2, TCI state 9, and TCI state #10, wherein the TCI code point corresponding to TCI state #1 is 000, the TCI code point corresponding to TCI state #2 is 001, the TCI code point corresponding to TCI state #9 is 010, and the TCI code point corresponding to TCI state #10 is 011.

[0258] At this time, the terminal can activate TCI state #1, TCI state #2, TCI state #9, and TCI state #10, and determine the first mapping relationship, that is, determine that TCI code point 000 is mapped to TCI state with TCI state identifier 1, TCI code point 001 is mapped to TCI state with TCI state identifier 2, TCI code point 010 is mapped to TCI state with TCI state identifier 9, and TCI code point 011 is mapped to TCI state with TCI state identifier 10.

[0259] S304, the network device sends the fifth message to the terminal.

[0260] In some embodiments, the fifth information may be a DCI or a field or information element in the DCI, such as the TCI field in the DCI.

[0261] In some embodiments, the fifth information includes a first TCI code point. Optionally, the fifth information is used to instruct the terminal to send an uplink message using the uplink beam corresponding to the first TCI code point.

[0262] It is understandable that for any TCI code point, it is associated with an uplink TCI state, and the uplink TCI state is associated with an uplink beam. The uplink beam associated with the TCI code point is also the uplink beam associated with the uplink TCI state.

[0263] In some embodiments, the fifth information is used to instruct the terminal to send an uplink message using a third uplink beam, the third uplink beam corresponding to the TCI state associated with the first TCI code point.

[0264] In some embodiments, the network device may determine the third uplink beam and the corresponding TCI code point based on the channel quality measurement results (CSI Report) and load conditions.

[0265] For example, if the network device determines that the channel quality is good, it can determine that the terminal uses an uplink beam pointing to the first TRP. If the uplink beam corresponding to TCI state #10 points to the first TRP, the network device can send the fifth information including TCI code point 011 to the terminal.

[0266] If the network device determines that the channel quality is poor, it can determine that the terminal uses the uplink beam pointing to the second TRP. If the uplink beam corresponding to TCI state #1 points to the second TRP, the network device can send the fifth information including TCI code point 000 to the terminal.

[0267] S305, the terminal determines the fifth TCI state associated with the first TCI code point according to the first mapping relationship.

[0268] For example, if the first TCI code point included in the fifth information is 011, the terminal can determine the TCI state associated with the first TCI code point as TCI state 10 based on the first mapping relationship.

[0269] If the first TCI code point included in the fifth information is 000, the terminal can determine the TCI state associated with the first TCI code point as TCI state 1 based on the first mapping relationship.

[0270] S306, the terminal determines the uplink beam based on the fifth TCI state.

[0271] In some embodiments, if the terminal determines that the configuration type corresponding to the fifth TCI state is the first type, it can determine the uplink beam based on the channel reciprocity according to the downlink TCI state associated with the fifth TCI state.

[0272] For example, if the fifth TCI state is TCI state #10, in the configuration corresponding to TCI state #10, the beamSourced field corresponds to linkedBeam, and the quasi-co-address source corresponding to its associated downlink TCI state is SSB#2. The terminal can then multiplex the beam corresponding to SSB#2 as an uplink beam based on channel reciprocity.

[0273] In some embodiments, if the terminal determines that the configuration type corresponding to the fifth TCI state is the second type, it can determine the uplink beam based on the spatial relationship information parameters associated with the fifth TCI state.

[0274] For example, if the fifth TCI state is TCI state #1, in the configuration corresponding to TCI state #1, the beamSourced field corresponds to independentBeam, and the terminal can determine the corresponding uplink beam based on the spatial relationship information parameter (SpatialRelationInfo) associated with TCI state #1.

[0275] In some embodiments, after determining the uplink beam, the terminal sends a PUSCH or SRS signal to the network device based on the uplink beam.

[0276] Compared to existing technologies, the separate mode mandates that the DL and UL TCI lists be completely independent. Even if the link is reciprocal, the base station must configure a separate spatialRelationInfo for each UL TCI state, causing the UE to perform redundant uplink beam maintenance.

[0277] In this embodiment, the TCI-State IE structure is extended by adding a beamSource field. A linkedBeam pointer is introduced to point to the DL TCI state, while the independentBeam is reserved for non-reciprocal links.

[0278] This solves the signaling redundancy (repeated configuration of known beam information) and resource waste (unnecessary uplink beam measurement and maintenance) problems that exist in the existing separate mode when handling primary base station (DL / UL TRP) communication. At the same time, it avoids the high standardization costs brought about by introducing a new RRC mode.

[0279] This utilizes a linkedBeam mechanism as a "virtual pointer." When this state is activated, the UE physical layer no longer searches for independent uplink space parameters, but directly reads the Quasi-Co Location, Type D (QCL-Type D) parameters (receive filter) of the associated DL TCI and applies them to the transmitter. Logically, this embeds the "convenience" of Joint mode into the "framework" of Separate mode, achieving unified and efficient management of reciprocal and non-reciprocal nodes.

[0280] In this way, for transmissions to the main base station, the downlink beam can be directly reused, eliminating additional SRS overhead and beam training delay. The base station can dynamically switch between "reciprocal mode" and "standalone mode" via DCI, adapting to UE movement and channel changes within milliseconds. Only the IE definition needs to be modified, without reconstructing the RRC state machine, making it easy to implement.

[0281] To enable those skilled in the art to more easily understand the detailed technical solutions provided in this application, the following more specific embodiments are also provided.

[0282] Figure 4 This is a flowchart illustrating a communication method according to an exemplary embodiment of this application. Figure 4 As shown, the communication method includes:

[0283] S401, the network side performs dynamic logical partitioning of SSB based on coverage capabilities and broadcasts differentiated SIB1 configurations.

[0284] The near-field RACH group has no spatial parameters, while the far-field RACH group contains spatial parameters pointing to the UL-only TRP.

[0285] In some embodiments, before the UE powers on and initiates access, the network-side device (gNB, i.e., DL / UL TRP) needs to complete the logical partitioning of the synchronization signal block (SSB) and the differentiated configuration of system messages (SIB1) based on its own hardware capabilities (such as transmit power level and antenna gain) and coverage requirements. This stage introduces intelligent decision-making on the network side, providing a basis for determining the subsequent behavior of the UE.

[0286] In some embodiments, the network-side SSB dynamic logical partitioning mechanism based on gNB capabilities includes:

[0287] The gNB broadcasts SSBs to its coverage area for downlink synchronization and beam measurement of the UE. To logically distinguish between "near-field users" (who should access DL / ULTRP) and "far-field users" (who should access UL-onlyTRP), the gNB internally divides all SSBs (index range typically 1~64) into two regions: Partition A (self-managed region) and Partition B (cooperative region).

[0288] In some embodiments, a logical boundary parameter N (ranging from 1 to 64) is introduced to define the boundary between the two partitions. To accommodate coverage differences between different types of base stations in the existing network, the value of the boundary parameter N is not fixed, but dynamically determined by the gNB based on its own transmit power level and effective coverage radius, as shown in Table 1.

[0289]

[0290] In some embodiments, a dedicated uplink target reference signal is configured on the network side:

[0291] The gNB pre-configures a dedicated Channel State Information Reference Signal (CSI-RS-for-UL-TRP) in its downlink resources. The spatial characteristics (Spatial Domain Transmission Filter) of this reference signal are precisely calibrated on the network side, and its physical beam is aligned with the receiving area of ​​the UL-only TRP. This signal serves as the spatial reference anchor point guiding the UE to transmit its uplink beam to the UL-only TRP.

[0292] In some embodiments, the network side broadcasts a differentiated SIB1 configuration (the mapping association between SSB and PRACH):

[0293] Based on the defined boundary parameter N, the gNB constructs and broadcasts two independent sets of random access configurations (RACH-ConfigCommon) in the system information block SIB1, and associates them with different SSB index ranges. This differentiated configuration can be used to trigger different UE access behaviors.

[0294] PRACH resource group A: Associated SSB index [1, N] (i.e., partition A). The configuration of this resource group does not include the spatialRelationInfo parameter. This implicitly indicates that UEs falling within this range should follow the default beam reciprocity principle to access the primary base station.

[0295] PRACH resource group B: Associated SSB index [N+1, 64] (i.e., partition B). The configuration of this resource group includes the spatialRelationInfo parameter, which explicitly points to the aforementioned CSI-RS-for-UL-TRP. This forces UEs falling within this range to use the specified spatial relationship to access the UL-only TRP.

[0296] S402, the terminal performs differentiated access based on the selected SSB partition.

[0297] If a near-field SSB is selected, the system will access the main base station using the default reciprocity; if a far-field SSB is selected, the L1 coverage logic will be executed, forcibly pointing to UL-only TRP access.

[0298] In some embodiments, after the UE powers on, it performs a cell search, measures the signal strength (RSRP) of all received SSBs, and selects the SSB with the strongest signal as the reference for camping and access. At this time, the UE's physical layer performs differentiated access behavior according to the PRACH resource group configuration mapped to the selected SSB index.

[0299] For example, scenario A: The UE is physically close to the DL / UL TRP and performs a regular access procedure.

[0300] Assume the gNB is configured with N=48. If the UE detects the strongest SSB as SSB #2 (belonging to partition A), the UE maps this SSB to PRACH resource group A according to SIB1.

[0301] The UE L1 layer checks the configuration of resource group A and finds that the spatialRelationInfo parameter is missing. At this time, the UE performs normal access behavior (default behavior): the UE assumes that there is beam reciprocity between downlink SSB#2 and uplink Msg1, and sends Msg1 to DL / UL TRP using the optimal beam direction for receiving SSB#2 (i.e., applying the same spatial filter as SSB#2).

[0302] In the subsequent process, the DL / UL TRP receives Msg1 and sends Msg2 (RAR), while the UE continues to send Msg3 based on reciprocity. Ultimately, the RRC connection is established on the primary base station, and the uplink path is established on the DL / UL TRP.

[0303] In another example, scenario B: the UE is physically close to the UL-only TRP and performs conditional access / L1 coverage behavior.

[0304] If the UE measures the strongest SSB as SSB #50 (belonging to partition B), the UE maps this SSB to PRACH resource group B according to SIB1.

[0305] The UE checks the configuration of resource group B at L1 layer and finds a valid spatialRelationInfo parameter (pointing to CSI-RS-for-UL-TRP). At this point, the UE performs conditional access behavior (L1 coverage logic):

[0306] The UE ignores the default reciprocity assumption of SSB #50 (i.e., it does not use the reverse beam of SSB #50 to transmit the preamble).

[0307] The UE forces the application of the spatial relationships defined by CSI-RS-for-UL-TRP to generate the uplink transmit beam. This makes Msg1 physically point to the UL-only TRP.

[0308] Subsequent interaction: After receiving Msg1, the UL-only TRP notifies the gNB (DL / UL TRP) via the ideal backhaul. The gNB then sends Msg2 via the downlink. When the UE sends Msg3, it must continue to use the spatial relationship logic of Msg1 (i.e., pointing to the UL-only TRP), thereby anchoring the uplink path to the UL-only TRP, effectively solving the access interference and latency problems for far-field users.

[0309] S403, Network side configuration of enhanced uplink TCI list.

[0310] The uplink TCI status list includes a mix of “linkedBeam” status for primary base stations and “independentBeam” status for auxiliary stations.

[0311] After the UE completes initial access and enters the RRC_CONNECTED state, the network side (gNB) needs to establish an efficient Transport Configuration Indicator (TCI) framework for the UE via RRC signaling to support subsequent high-frequency data transmission. The core of this stage is to build an enhanced uplink TCI state list, which, while compatible with the existing Rel-17 / 18 unified TCI framework, introduces hybrid management capabilities for "reciprocal beams" and "independent beams".

[0312] In some embodiments, the network-side RRC reconfiguration process is initiated as follows:

[0313] The gNB sends an RRCReconfiguration message to the UE. This message contains information elements (IEs) such as ServingCellConfig and BWP-UplinkDedicated, which are used to configure the bandwidth portion (BWP) parameters of the serving cell.

[0314] In some embodiments, the network side performs unified TCI mode settings:

[0315] In ServingCellConfig or PDSCH-Config, explicitly configure the unified TCI state type, such as configuring unifiedTCI-StateType-r17 = separate. This instructs the UE that the current serving cell adopts a separate TCI state management mode. That is, the downlink (DL) beam and uplink (UL) beam will be defined by two separate lists (dl-OrJoint-TCIStateList and ul-TCIStateList), instead of using a single joint list.

[0316] In some embodiments, the downlink TCI status list configuration includes:

[0317] In the downlink BWP configuration (e.g., BWP-DownlinkDedicated -> PDSCH-Config), the gNB configures the downlink TCI list, such as configuring dl-OrJoint-TCIStateList-r17, which configures several TCI-States. Each state defines the quasi-co-address (QCL) source of the downlink receive beam (e.g., QCL-TypeD points to a certain SSB or CSI-RS).

[0318] For example, TCI-StateId is configured as 0, with its QCL source pointing to SSB #2 of DL / UL TRP.

[0319] In some embodiments, the uplink TCI status list configuration includes:

[0320] The gNB configures an enhanced list of uplink TCIs in the uplink BWP configuration (e.g., BWP-UplinkDedicated -> PUCCH-Config or PUSCH-Config).

[0321] In this list, the TCI-UL-State information element is expanded by introducing a new CHOICE structure field (denoted as beamSource-r19), which allows for differentiated definitions of the beam source for each TCI state:

[0322] The uplink TCI status list (TCI-UL-State-r19) can be viewed as follows:

[0323] TCI-UL-State-r19::=SEQUENCE{

[0324] tci-StateId-r17……TCI-StateId,

[0325] beamSource-r19……CHOICE{

[0326] linkedBeam……TCI-StateId,#Configuration type A

[0327] independentBeam……patialRelationInfo#Configuration Type B

[0328] }

[0329] }

[0330] Configuration type A corresponds to a reciprocal state (used for DL / UL TRP). When this TCI state is used to point to the main base station (DL / UL TRP), its antenna reciprocity is utilized.

[0331] In configuration type A, the gNB selects linkedBeam as the beamSource and fills in a configured DL TCI State ID (e.g., pointing to ID=0) as the parameter value. After the UE parses this configuration, it establishes a mapping relationship. When the DCI subsequently activates this state, the UE will not look up the independent uplink spatial parameters, but will directly read the QCL-TypeD parameter (i.e., the receive beam) in the downlink TCI state with ID=0 and reuse it as the uplink transmit beam (Tx Spatial Filter).

[0332] Configuration type B corresponds to the standalone state (used for UL-only TRP). When this TCI state is used to point to an uplink-only node (UL-only TRP), the downlink beam cannot be reused due to the different physical locations.

[0333] In configuration type B, gNB selects independentBeam as beamSource and fills in SpatialRelationInfo as the parameter value. SpatialRelationInfo usually points to an SRS resource specifically used for uplink probing or a specific CSI-RS (such as CSI-RS-for-UL-TRP).

[0334] After the UE parses this configuration, it recognizes it as the traditional Separate mode state. When the DCI activates this state, the UE ignores the downlink beam and performs beamforming according to the reference signal indicated by SpatialRelationInfo.

[0335] In some embodiments, the UE side can also perform configuration activation and verification.

[0336] Optionally, after receiving the RRCReconfiguration, the UE will check whether the DL TCI ID pointed to by the linkedBeam exists in dl-OrJoint-TCIStateList. If it does not exist, a configuration error (RRCReconfiguration Failure) will be reported; if it exists, the configuration will take effect.

[0337] Optionally, the UE updates its MAC layer TCI activation mapping table. At this time, the entries in the mapping table that point to the DL / UL TRP become "virtual pointers" (pointing to the DL TCI), while the entries that point to the UL-only TRP become "entity configurations" (containing specific spatial parameters).

[0338] S404: When the network side activates the "linked beam" via DCI dynamic indication, the terminal directly reuses the downlink beam for transmission; when the "independent beam" is activated, the terminal uses an independent uplink beam for transmission.

[0339] In some embodiments, after the RRC connection is established and the TCI state configuration is completed, the data transmission phase begins. At this time, the gNB scheduler dynamically determines, based on the channel quality measurement results (CSI Report) and load conditions, whether each uplink transmission (PUSCH) or probe signal (SRS) is received through the primary base station (DL / ULTRP) or through the auxiliary receiving station (UL-onlyTRP).

[0340] In this way, by reusing the existing DCI format and TCI field, and combining it with the newly added L1 processing logic on the UE side, transparent and fast scheduling of the two transmission paths mentioned above is achieved.

[0341] In some embodiments, during TCI state activation (MAC layer mapping update), the TCI field (Transmission Configuration Indication field) in the DCI typically contains only 3 bits (supporting 8 code points), while the TCI state list configured by the RRC may contain as many as 64 or 128 states. Therefore, before DCI scheduling, the gNB needs to activate a portion of the TCI states via MAC-CE signaling and map them to the TCI code points in the DCI.

[0342] For example, the gNB sends a MAC-CE activation command to mix and map the enhanced uplink TCI states (including linkedBeam and independentBeam types) configured in the RRC phase onto TCI code points 0-7.

[0343] For example, TCI code point 000 is mapped to ul-TCI-StateID = 0 (type: linkedBeam, pointing to DL / ULTRP);

[0344] TCI code point 001 is mapped to ul-TCI-StateID = 1 (type: independentBeam, pointing to UL-onlyTRP).

[0345] In some embodiments, when the gNB needs to schedule the UE for uplink transmission, it sends downlink control information. The DCI contains resource allocation information (frequency domain / time domain) and the TCI domain.

[0346] Specifically, if the gNB determines that the current UE is in a good coverage area of ​​the DL / UL TRP and that reciprocity is more efficient, it sets the TCI field of the DCI to 000. If the gNB determines that the UE is at the edge of the DL / UL TRP and needs to use UL-only TRP to enhance uplink, it sets the TCI field of the DCI to 001.

[0347] In some embodiments, after the UE physical layer receives and decodes the DCI, it parses out the TCI code points and finds the corresponding ul-TCI-State according to the mapping table. Subsequently, the UE checks the configuration type of the beamSource field in this state and performs a differentiated transmit beam (Tx Spatial Filter) determination procedure.

[0348] For example, in scenario A:

[0349] When the DCI indicator activates a TCI state of type linkedBeam (such as code point 000), the UE reads the value of the linkedBeam parameter in that UL TCI state, which points to a downlink TCI state ID (denoted as ID_DL).

[0350] The UE looks up the state corresponding to ID_DL in the downlink TCI list and obtains the QCL-TypeD reference signal (e.g., SSB #2) currently used for PDSCH / PDCCH reception for that state.

[0351] The UE does not perform independent uplink spatial relationship measurements, but directly applies the Spatial Reciprocity principle. The UE will use the receive spatial filter (RxSpatial Filter) used to receive the downlink reference signal (SSB #2) as the transmit spatial filter (Tx Spatial Filter) for this PUSCH / SRS transmission. It will then use this beam to transmit data to the DL / UL TRP.

[0352] In this way, by utilizing the downlink beam measurement results, the gNB does not need to maintain the uplink beam separately for the DL / UL TRP, which significantly reduces reference signal overhead and beam management delay.

[0353] In another example, in scenario B:

[0354] When the DCI indication is activated for an independentBeam type TCI state (such as code point 001), the UE reads the value of the independentBeam parameter in that ULTCI state, which contains an explicit SpatialRelationInfo.

[0355] The SpatialRelationInfo points to a specific uplink reference signal (such as SRS or CSI-RS-for-UL-TRP).

[0356] The UE ignores the current downlink receive beam information. Based on the indicated reference signal, the UE determines the transmit spatial filter to be directed to the UL-only TRP. This is typically based on previous SRS polling or beam training results during initial access, and the UE uses this independent beam to transmit data to the UL-only TRP.

[0357] This ensures that, in non-co-located scenarios, the uplink can perform beamforming independently of the downlink, guaranteeing uplink coverage for far-field users.

[0358] In some embodiments, steps S401 to S402 can be performed individually, and steps S403 and S404 are optional after step S402 is performed.

[0359] In some embodiments, steps S403 and S404 can be performed independently and may not depend on steps S401 and S402.

[0360] The embodiments described above in this application can be applied to asymmetric DL sTRP / UL mTRP scenarios, but are not limited thereto. For example, they can also be applied to 5G-Advanced and 6G network cooperative communication (CoMP) scenarios, millimeter wave (FR2) and terahertz (THz) high-frequency communication scenarios, macro-micro collaboration in heterogeneous networks (HetNet), and so on.

[0361] In 5G-Advanced and 6G network cooperative communication scenarios, especially in Co-operated Multi-Point Transmission (CoMP) scenarios and in Non-Coherent Joint Transmission (NC-JT) scenarios, multiple Transmission Points (TRPs) simultaneously provide services to the UE, but the physical locations of each TRP are dispersed. The linkedBeam mechanism in this application embodiment can be used to instruct the UE to reuse reciprocal downlink beams from multiple cooperative TRPs, while independentBeam can be used to handle specific cooperative nodes that lack reciprocity due to backhaul limitations or hardware differences.

[0362] In millimeter-wave (FR2) and terahertz (THz) high-frequency communication scenarios, high-frequency communication heavily relies on high-gain beamforming, and the signal is extremely sensitive to obstruction. To address coverage blind spots, a large number of filler nodes (such as micro base stations) are often employed. The "dynamic SSB partitioning based on base station capabilities" strategy in this application is particularly suitable for high-frequency scenarios. Macro base stations can dynamically adjust the near-field / far-field boundary according to the effective coverage distance of their millimeter-wave beams, guiding UEs located at the coverage edge or in blind spots to automatically access closer filler nodes, thereby ensuring link robustness.

[0363] In HetNet (Heterogeneous Network) scenarios involving macro and micro cell collaboration, macro base stations offer wide coverage but limited capacity, while micro base stations offer large capacity but limited coverage. Downlink / Uplink Decoupling (DUDe) is a typical technique in HetNet (downlink macro base station, uplink micro base station). The embodiments of this application actually provide a standardized protocol stack to support DUDe. Through dynamic partitioning and differentiated RACH configuration, a traffic offloading strategy of "downlink residing at macro base stations, uplink accessing micro base stations" can be efficiently implemented without complex handover procedures.

[0364] Figure 5 This is a schematic block diagram illustrating a communication device 500 according to an exemplary embodiment of this application. The communication device 500 may be a terminal device or a network device, or a chip, chip system, or processor that implements the above-described methods. The communication device 500 can be used to implement the methods described in the above-described method embodiments; for details, please refer to the descriptions in the above-described method embodiments.

[0365] like Figure 5 As shown, the communication device 500 may include one or more processors 510, which may also be referred to as processing units or processing modules, and can implement certain control functions. The processor 510 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, while the central processing unit can be used to control the communication device 500 (e.g., a base station, baseband chip, user, user chip), execute software programs, and process data from the software programs.

[0366] In one possible implementation, the processor 510 may also store instructions and / or data, which can be executed by the processor 510 to cause the communication device 500 to perform the methods described in the above method embodiments. Optionally, the processor 510 may store code instructions, which are used by the processor 510 to implement the methods described in the above method embodiments via logic circuits or by executing the code instructions.

[0367] In another possible implementation, the communication device 500 may include an interface circuit 520 for implementing receiving and transmitting functions. For example, the interface circuit 520 may be a transceiver circuit, an interface, a communication interface, or a transceiver. The interface circuit 520 can be used to receive signals from other communication devices besides the communication device 500 and transmit them to the processor 510, or to send signals from the processor 510 to other communication devices besides the communication device 500. The transceiver circuit, interface, interface circuit, or transceiver in the interface circuit 520 for implementing receiving and transmitting functions may be separate or integrated. The aforementioned transceiver circuit, interface, interface circuit, or transceiver can be used for reading and writing code / data, or it can be used for transmitting or relaying signals.

[0368] Optionally, the communication device 500 may include one or more memories 530, which may store instructions that can be executed on the processor 510, causing the communication device 500 to perform the methods described in the above method embodiments. Optionally, the memories 530 may also store data. Optionally, the processor 510 may also store instructions and / or data. The processor 510 and the memories 530 may be provided separately or integrated together.

[0369] It should be understood that, in one possible implementation, the steps in the method embodiments provided in this application can be completed by integrated logic circuits in the processor hardware or by instructions in software form. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are not provided here.

[0370] In one implementation, the communication device 500 may correspond to the terminal in the above method embodiments and may be used to execute the various steps and / or processes executed by the terminal in the above method embodiments. The processor 510 may be used to execute instructions stored in the memory 530, and when the processor 510 executes the instructions stored in the memory, the processor 510 is used to execute the various steps and / or processes of the above method embodiments corresponding to the terminal.

[0371] In another implementation, the communication device 500 may correspond to the network device in the above method embodiments and may be used to execute the various steps and / or processes executed by the network device in the above method embodiments. The processor 510 may be used to execute instructions stored in the memory of the network device, and when the processor 510 executes the instructions stored in the memory, the processor 510 is used to execute the various steps and / or processes of the above method embodiments corresponding to the network device.

[0372] It should be understood that the aforementioned processing device can be one or more chips. For example, the processing device can be a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on-chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0373] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0374] This application also provides a communication device, including: a module for performing the steps executed by a terminal in the communication method provided in the foregoing embodiments, or a module for performing the steps executed by a network device in the communication method provided in the foregoing embodiments.

[0375] Figure 6 This is a schematic block diagram illustrating a first communication device 600 according to an exemplary embodiment of this application. Optionally, the first communication device 600 may be provided as a terminal, or as part of a terminal. Figure 6 As shown, the first communication device 600 includes:

[0376] The first communication module 610 is used to receive first information broadcast by a network device, wherein the network device includes a first transmission receiving point (TRP) and a second TRP. The first TRP is used to send downlink messages and receive uplink messages, and the second TRP is only used to receive uplink messages. The first information includes a first random access channel (RACH) resource configuration associated with a first synchronization signal block (SSB) set and a second RACH resource configuration associated with a second SSB set.

[0377] The first processing module 620 is used to initiate random access using a first uplink beam according to the first RACH resource configuration when it is determined that the SSB with the highest signal strength belongs to the first SSB set, and the first uplink beam points to the first TRP.

[0378] The first processing module 620 is further configured to, when determining that the SSB with the highest signal strength belongs to the second SSB set, initiate random access using the second uplink beam according to the second RACH resource configuration, wherein the second uplink beam points to the second TRP.

[0379] In some embodiments, the first processing module 620 is configured to:

[0380] The first uplink beam is determined based on channel reciprocity;

[0381] The first processing module 620 is also used for:

[0382] The second uplink beam is determined based on the first spatial relationship information parameters, and the second RACH resource configuration includes the first spatial relationship information parameters.

[0383] In some embodiments, the first spatial relationship information parameter is associated with a first channel state information reference signal (CSI-RS), and the first CSI-RS points to the receiving area of ​​the second TRP.

[0384] In some embodiments, the index of an SSB in the first SSB set is less than or equal to the boundary parameter;

[0385] The index of an SSB in the second SSB set is greater than the boundary parameter;

[0386] The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter.

[0387] In some embodiments, the first communication module 610 is further configured to:

[0388] Receive the second information sent by the network device;

[0389] The second information includes at least one of the following:

[0390] The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal.

[0391] Downlink TCI status list;

[0392] Uplink TCI status list;

[0393] The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

[0394] In some embodiments, the downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-address source of the downlink beam corresponding to each first TCI state.

[0395] In some embodiments, the uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status;

[0396] The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type.

[0397] The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

[0398] In some embodiments, the uplink TCI status list is also used to indicate at least one of the following:

[0399] The downlink TCI state associated with each of the third TCI states;

[0400] Spatial relationship information parameters associated with each of the fourth TCI states.

[0401] In some embodiments, the first processing module 620 is further configured to:

[0402] The downlink TCI state list is determined to include the downlink TCI state associated with each of the third TCI states. The TCI mapping table of the MAC layer is updated. The TCI mapping table is used to indicate the downlink TCI state associated with each of the third TCI states, and / or the spatial relationship information parameters associated with each of the fourth TCI states.

[0403] If it is determined that the downlink TCI states associated with the third TCI state include downlink TCI states outside the downlink TCI state list, a third message is sent to the network device, the third message being used to indicate configuration failure.

[0404] In some embodiments, the first communication module 610 is further configured to receive fourth information sent by the network device;

[0405] The first processing module 620 is further configured to activate at least one TCI state in the uplink TCI state list and determine a first mapping relationship based on the fourth information, wherein the first mapping relationship is used to indicate the TCI code point associated with each activated TCI state.

[0406] In some embodiments, the first communication module 610 is further configured to receive fifth information sent by the network device, the fifth information including a first TCI code point;

[0407] The first processing module 620 is further configured to determine the fifth TCI state associated with the first TCI code point based on the first mapping relationship;

[0408] The first processing module 620 is also used to determine the uplink beam based on the fifth TCI state.

[0409] In some embodiments, the first processing module 620 is further configured to:

[0410] The fifth TCI state is determined to be associated with the sixth TCI state. The uplink beam is determined based on the quasi-co-address source of the downlink beam corresponding to the sixth TCI state. The sixth TCI state is any TCI state among the first TCI states.

[0411] The fifth TCI state is determined to be associated with the second spatial relationship information parameter, and the uplink beam is determined based on the second spatial relationship information parameter.

[0412] Figure 7 This is a schematic block diagram of a second communication device 700 according to an exemplary embodiment of this application. Optionally, the second communication device 700 may be provided as a network device, or part of a network device. The second communication device 700 includes a first transmission receiving point (TRP) and a second TRP. The first TRP is used to send downlink messages and receive uplink messages, and the second TRP is used only to receive uplink messages. Figure 7 As shown, the second communication device 700 includes:

[0413] The second communication module 710 is used to broadcast first information, the first information including a first random access channel RACH resource configuration associated with a first synchronization signal block (SSB) set, and a second RACH resource configuration associated with a second SSB set;

[0414] Wherein, the first RACH resource configuration is used by the terminal to initiate random access using the first uplink beam when it is determined that the SSB with the highest signal strength belongs to the first SSB set, and the first uplink beam points to the first TRP;

[0415] The second RACH resource configuration is used by the terminal to initiate random access using the second uplink beam when it determines that the SSB with the highest signal strength belongs to the second SSB set, and the second uplink beam points to the second TRP.

[0416] In some embodiments, the first uplink beam is determined based on channel reciprocity;

[0417] The second RACH resource configuration includes a first spatial relationship information parameter, and the second uplink beam is determined based on the first spatial relationship information parameter.

[0418] In some embodiments, the second communication module 710 is further configured to:

[0419] Send a first channel state information reference signal (CSI-RS) to the terminal, wherein the first CSI-RS points to the receiving area of ​​the second TRP;

[0420] The first spatial relationship information parameter is associated with the first CSI-RS.

[0421] In some embodiments, the second communication device 700 further includes:

[0422] The second processing module is used to determine the boundary parameters based on the capabilities of the first TRP, and the boundary parameters are used to determine the first SSB set and the second SSB set.

[0423] The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter;

[0424] The index of an SSB in the first SSB set is less than or equal to the boundary parameter;

[0425] The index of an SSB in the second SSB set is greater than the boundary parameter.

[0426] In some embodiments, the second communication module 710 is further configured to:

[0427] Once it is determined that the terminal has completed initial access and entered the RRC connection state, the second information is sent to the terminal;

[0428] The second information includes at least one of the following:

[0429] The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal.

[0430] Downlink TCI status list;

[0431] Uplink TCI status list;

[0432] The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

[0433] In some embodiments, the downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-address source of the downlink beam corresponding to each first TCI state.

[0434] In some embodiments, the uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status;

[0435] The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type.

[0436] The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

[0437] In some embodiments, the uplink TCI status list is also used to indicate at least one of the following:

[0438] The downlink TCI state associated with each of the third TCI states;

[0439] Spatial relationship information parameters associated with each of the fourth TCI states.

[0440] In some embodiments, the second communication module 710 is further configured to:

[0441] A fourth message is sent to the terminal, the fourth message being used to instruct the terminal to activate at least one TCI state in the uplink TCI state list and determine a first mapping relationship, the first mapping relationship being used to indicate the TCI code point associated with each activated TCI state.

[0442] In some embodiments, the second communication module 710 is further configured to:

[0443] The terminal sends a fifth message, which includes a first TCI code point. The first TCI code point is used by the terminal to determine the fifth TCI state and determine the uplink beam based on the fifth TCI state.

[0444] In some embodiments, the uplink beam is determined based on a quasi-co-located source of the downlink beam corresponding to a sixth TCI state associated with the fifth TCI state, wherein the sixth TCI state is any TCI state among the first TCI states; or...

[0445] The uplink beam is determined based on the second spatial relationship information parameters associated with the fifth TCI state.

[0446] This application also provides a communication system including the aforementioned terminal and network device. The terminal is configured to implement the steps executed by the terminal in the communication methods described above, and the network device is configured to implement the steps executed by the network device in the communication methods described above.

[0447] This application also provides a chip coupled to a memory, which is used to read and execute computer programs or instructions stored in the memory to perform the communication methods in the above embodiments.

[0448] This application also provides a chip system including a processor; the processor is used to execute computer execution instructions to cause a device equipped with the chip system to perform the communication methods in the above embodiments. The chip system may be composed of a chip or may include chips and other discrete devices. The chip system may include input circuitry or an interface for transmitting information or data, and output circuitry or an interface for receiving information or data.

[0449] This application also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the communication method described in the above embodiments.

[0450] This application also provides a non-transitory computer-readable storage medium comprising a computer program or instructions that, when executed on a computer, cause the computer to perform the communication methods described in the above embodiments.

[0451] This application also provides a computer program product, the computer-readable storage medium storing program code, which, when run on a computer, causes the computer to perform the aforementioned related steps to implement the communication method in the above embodiments.

[0452] In this embodiment, the communication device, computer-readable storage medium, computer program product or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0453] In the 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 through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0454] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated.

[0455] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0456] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A communication method, characterized in that, The method, executed by a terminal, includes: The network device receives first information broadcast by a network device, wherein the network device includes a first transmission receiving point (TRP) and a second TRP. The first TRP is used to send downlink messages and receive uplink messages, and the second TRP is only used to receive uplink messages. The first information includes a first random access channel (RACH) resource configuration associated with a first synchronization signal block (SSB) set and a second RACH resource configuration associated with a second SSB set. Receive at least one SSB sent by the network device via the first TRP; When it is determined that the SSB with the highest signal strength belongs to the first SSB set, random access is initiated using the first uplink beam according to the first RACH resource configuration, and the first uplink beam points to the first TRP; When it is determined that the SSB with the highest signal strength belongs to the second SSB set, random access is initiated using the second uplink beam according to the second RACH resource configuration, and the second uplink beam points to the second TRP; The step of initiating random access using the first uplink beam according to the first RACH resource configuration includes: The first uplink beam is determined based on channel reciprocity; The step of initiating random access using the second uplink beam according to the second RACH resource configuration includes: The second uplink beam is determined based on the first spatial relationship information parameter. The second RACH resource configuration includes the first spatial relationship information parameter, which is associated with a reference signal pointing to the receiving area of ​​the second TRP. The reference signal is transmitted by the first TRP.

2. The method according to claim 1, characterized in that, The first spatial relationship information parameter is associated with the first channel state information reference signal CSI-RS, and the first CSI-RS points to the receiving area of ​​the second TRP.

3. The method according to claim 1, characterized in that, The index of an SSB in the first SSB set is less than or equal to the boundary parameter; The index of an SSB in the second SSB set is greater than the boundary parameter; The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter.

4. The method according to claim 1, characterized in that, The method further includes: Receive the second information sent by the network device; The second information includes at least one of the following: The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal. Downlink TCI status list; Uplink TCI status list; The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

5. The method according to claim 4, characterized in that, The downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-located source of the downlink beam corresponding to each first TCI state.

6. The method according to claim 5, characterized in that, The uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status. The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type. The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

7. The method according to claim 6, characterized in that, The uplink TCI status list is also used to indicate at least one of the following: The downlink TCI state associated with each of the third TCI states; Spatial relationship information parameters associated with each of the fourth TCI states.

8. The method according to claim 7, characterized in that, The method further includes: The downlink TCI state list is determined to include the downlink TCI state associated with each of the third TCI states. The TCI mapping table of the MAC layer is updated. The TCI mapping table is used to indicate the downlink TCI state associated with each of the third TCI states, and / or the spatial relationship information parameters associated with each of the fourth TCI states. If it is determined that the downlink TCI states associated with the third TCI state include downlink TCI states outside the downlink TCI state list, a third message is sent to the network device, the third message being used to indicate configuration failure.

9. The method according to claim 6, characterized in that, The method further includes: Receive the fourth information sent by the network device; Based on the fourth information, at least one TCI state in the uplink TCI state list is activated and a first mapping relationship is determined, the first mapping relationship being used to indicate the TCI code point associated with each activated TCI state.

10. The method according to claim 9, characterized in that, The method includes: Receive the fifth information sent by the network device, the fifth information including the first TCI code point; Based on the first mapping relationship, determine the fifth TCI state associated with the first TCI code point; The uplink beam is determined based on the fifth TCI state.

11. The method according to claim 10, characterized in that, The step of determining the uplink beam based on the fifth TCI state includes: The fifth TCI state is determined to be associated with the sixth TCI state. The uplink beam is determined based on the quasi-co-address source of the downlink beam corresponding to the sixth TCI state. The sixth TCI state is any TCI state among the first TCI states. The fifth TCI state is determined to be associated with the second spatial relationship information parameter, and the uplink beam is determined based on the second spatial relationship information parameter.

12. A communication method, characterized in that, Performed by a network device, the network device including a first Transmission Receiver Point (TRP) and a second TRP, wherein the first TRP is used to send downlink messages and receive uplink messages, and the second TRP is used only to receive uplink messages, the method includes: Broadcast first information, the first information including a first random access channel RACH resource configuration associated with a first synchronization signal block (SSB) set, and a second RACH resource configuration associated with a second SSB set; At least one SSB is sent via the first TRP; Wherein, the first RACH resource configuration is used by the terminal to initiate random access using the first uplink beam when it is determined that the SSB with the highest signal strength belongs to the first SSB set. The first uplink beam points to the first TRP and is determined based on channel reciprocity. The second RACH resource configuration is used by the terminal to initiate random access using the second uplink beam when it determines that the SSB with the highest signal strength belongs to the second SSB set. The second uplink beam points to the second TRP. The second RACH resource configuration includes a first spatial relationship information parameter. The second uplink beam is determined based on the first spatial relationship information parameter. The first spatial relationship information parameter is associated with a reference signal pointing to the receiving area of ​​the second TRP. The reference signal is sent by the first TRP.

13. The method according to claim 12, characterized in that, The method further includes: Send a first channel state information reference signal (CSI-RS) to the terminal, wherein the first CSI-RS points to the receiving area of ​​the second TRP; The first spatial relationship information parameter is associated with the first CSI-RS.

14. The method according to claim 12, characterized in that, The method further includes: Based on the capabilities of the first TRP, a boundary parameter is determined, which is used to determine the first SSB set and the second SSB set; The stronger the ability of the first TRP to receive uplink messages, the larger the value of the boundary parameter; The index of an SSB in the first SSB set is less than or equal to the boundary parameter; The index of an SSB in the second SSB set is greater than the boundary parameter.

15. The method according to claim 12, characterized in that, The method further includes: Once it is determined that the terminal has completed initial access and entered the Radio Resource Control (RRC) connection state, the second information is sent to the terminal; The second information includes at least one of the following: The first indication information is used to indicate the Transmission Configuration Indication (TCI) State Management mode adopted by the serving cell of the terminal. Downlink TCI status list; Uplink TCI status list; The TCI status management mode includes at least a first mode, in which the downlink TCI status list is used by the terminal to determine the downlink beam, and the uplink TCI status list is used by the terminal to determine the uplink beam.

16. The method according to claim 15, characterized in that, The downlink TCI state list is used to indicate at least one first TCI state and the quasi-co-located source of the downlink beam corresponding to each first TCI state.

17. The method according to claim 16, characterized in that, The uplink TCI status list is used to indicate at least one second TCI status and the configuration type corresponding to each second TCI status. The configuration type includes a first type and a second type, and the second TCI state includes at least one of a third TCI state and a fourth TCI state, wherein the third TCI state corresponds to the first type and the fourth TCI state corresponds to the second type. The uplink beam determined based on the third TCI state points to the first TRP, and the uplink beam determined based on the fourth TCI state points to the second TRP.

18. The method according to claim 17, characterized in that, The uplink TCI status list is also used to indicate at least one of the following: The downlink TCI state associated with each of the third TCI states; Spatial relationship information parameters associated with each of the fourth TCI states.

19. The method according to claim 17, characterized in that, The method further includes: A fourth message is sent to the terminal, the fourth message being used to instruct the terminal to activate at least one TCI state in the uplink TCI state list and determine a first mapping relationship, the first mapping relationship being used to indicate the TCI code point associated with each activated TCI state.

20. The method according to claim 19, characterized in that, The method includes: The terminal sends a fifth message, which includes a first TCI code point. The first TCI code point is used by the terminal to determine the fifth TCI state and determine the uplink beam based on the fifth TCI state.

21. The method according to claim 20, characterized in that, The uplink beam is determined based on a quasi-co-located source of the downlink beam corresponding to a sixth TCI state associated with the fifth TCI state, wherein the sixth TCI state is any TCI state among the first TCI states; or... The uplink beam is determined based on the second spatial relationship information parameters associated with the fifth TCI state.

22. A communication device, characterized in that, include: A module for performing the method as described in any one of claims 1-11, or a module for performing the method as described in any one of claims 12-21.

23. A communication device, characterized in that, At least one processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices besides the communication device and transmit them to the processor or to send signals from the processor to other communication devices besides the communication device, the processor being configured to implement the method as described in any one of claims 1-11 via logic circuits or executable code instructions, or the processor being configured to implement the method as described in any one of claims 12-21 via logic circuits or executable code instructions.

24. A communication system, characterized in that, The device includes a terminal and a network device, wherein the terminal is configured to implement the communication method according to any one of claims 1-11, and the network device is configured to implement the communication method according to any one of claims 12-21.

25. A non-transitory computer-readable storage medium, characterized in that, It includes a computer program or instructions that, when run on a computer, cause the computer to perform the method as described in any one of claims 1-11, or cause the computer to perform the method as described in any one of claims 12-21.

26. A chip system, characterized in that, Including the processor; The processor is configured to execute computer execution instructions to cause a device on which the chip system is mounted to perform the method as claimed in any one of claims 1-11 or 12-21.

27. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-11 or 12-21.

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