Method and apparatus for multi-TRP operation

Abstract

The invention discloses a method and a device for operation of a multi-transmission receiving point (multi-TRP), and the method and the device for operation of the multi-TRP are used for the operation of the multi-transmission receiving point (multi-TRP) of the multi-transmission receiving point (multi-TRP) of the multi-transmission receiving point (multi-TRP) of the multi-transmission receiving point. In one embodiment, a method performed by a user equipment (UE) includes: configuring to receive a first signaling from a network, where the first signaling is used for a multi-TRP operation; and / or receiving a second signaling from the network, wherein the second signaling is used for a multi-TRP operation.

Description

Technical Field

[0001] The present application relates to the field of wireless communication systems, and more specifically to a method and apparatus for multiple-transmission reception point (multi-TRP) operation, such as a wireless communication system operating in a multiple-input multiple-output (MIMO) system. More specifically, the goal is to provide some solutions based on a unified TCI framework for activation and indication of transmission configuration indication (TCI) states in multi-TRP operation. Background Art

[0002] MIMO is an effective method to enhance the capacity of wireless links by multiplexing multiple transmit and receive antennas. MIMO refers to a practical technology that can send and receive multiple data signals simultaneously through the same wireless channel, thereby significantly improving the performance of spectrum efficiency. Some progress has been made to support multi-TRP operation, one of the key technologies of MIMO, to operate in an efficient manner.

[0003] In the current technology, single TRP operation uses a unified TCI framework, while multi-TRP operation does not have a unified TCI framework. How to provide a unified TCI framework-based activation and indication solution for the transmission configuration indication (TCI) state in multi-TRP operation is still an unresolved problem. Summary of the invention

[0004] The purpose of the present application is to propose a method and device for multiple-transmission reception point (multi-TRP) operation.

[0005] In a first aspect of the present application, a multi-TRP operation method performed by a user equipment (UE) includes: being configured to receive a first signaling from a network, wherein the first signaling is used for multi-TRP operation; and / or receiving a second signaling from the network, wherein the second signaling is used for multi-TRP operation.

[0006] In a second aspect of the present application, a multi-TRP operation method performed by a network includes: configuring a first signaling to a user equipment (UE), wherein the first signaling is used for multi-TRP operation; and / or transmitting a second signaling to the UE, wherein the second signaling is used for multi-TRP operation.

[0007] In a third aspect of the present application, a user equipment (UE) includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to execute the above method.

[0008] In a fourth aspect of the present application, a network includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to execute the above method.

[0009] In a fifth aspect of the present application, a non-transitory machine-readable storage medium stores instructions thereon, and when a computer executes the instructions, the instructions cause the computer to execute the above method.

[0010] In a sixth aspect of the present application, a chip includes a processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes the above method.

[0011] In a seventh aspect of the present application, a computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the above method.

[0012] In an eighth aspect of the present application, a computer program product comprises a computer program, wherein the computer program enables a computer to execute the above method.

[0013] In a ninth aspect of the present application, a computer program is provided, wherein the computer program enables a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or related technologies, the following briefly introduces the drawings to be described in the embodiments. Obviously, the drawings are only some embodiments of the present application, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any price.

[0015] Figure 1 It is a schematic diagram of the operation of multiple-transmission reception point (multi-TRP) according to an embodiment of the present application.

[0016] Figure 2This is a block diagram of one or more user equipment (UE) and a base station (e.g., gNB) in a communication network system according to an embodiment of the present application.

[0017] Figure 3 It is a flowchart of a multi-TRP operation method performed by a user equipment (UE) according to an embodiment of the present application.

[0018] Figure 4 It is a flowchart of the multi-TRP operation method performed by the base station according to the embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of two MAC CE examples shown in an embodiment of the present application.

[0020] Figure 6 This is a schematic diagram of a DCI example shown in an embodiment of the present application, wherein one DCI indicates a TCI state from an activated TCI state list corresponding to one TRP, and another DCI indicates a TCI state from an activated TCI state list corresponding to another TRP.

[0021] Figure 7 This is a schematic diagram of a DCI example shown in an embodiment of the present application, in which a DCI simultaneously indicates the TCI state from an activated TCI state list corresponding to one TRP and the TCI state from an activated TCI state list corresponding to other TRPs.

[0022] Figure 8 This is a schematic diagram of the TCI field in the DCI being extended to 4 bits according to an embodiment of the present application, wherein the added 1 bit is used to indicate TRP.

[0023] Fig. 9 This is a schematic diagram of extending the TCI field in the DCI to 6 bits according to an embodiment of the present application.

[0024] Fig.10 This is a schematic diagram showing that PUCCH resources or PUCCH resource sets can be associated with different TRPs according to an embodiment of the present application.

[0025] Fig.11 It is a system block diagram for wireless communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical content, structural features, objectives and effects of the present application are described in detail below in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present application are only used to describe the purpose of specific embodiments, and are not intended to limit the present application.

[0027] Multiple-input multiple-output (MIMO) is one of the key technologies in new radio (NR) systems and has been successfully commercially deployed. In MIMO communication systems, both UE and base stations contain a large number of antenna elements. Especially for base stations, these antenna elements can be distributed in different panels, such as Figure 1 shown. Figure 1 It is shown that in multi-transmission reception point (multi-TRP) operation, each panel is placed in a different position so that the base station can better communicate with the UE. Specifically, in the current specification, panels located in different positions are called multi-TRP. By exploiting spatial diversity, multi-TRP operation can simultaneously optimize the throughput and transmission reliability of downlink (DL) and uplink (UL) channels, especially in frequency range 2 (FR 2) when there is unpredictable obstruction between the TRP and the UE.

[0028] Figure 2 It is shown that according to some embodiments of the present application, a communication network system 40 for communication is provided, which includes one or more user equipment (UE) 10 and a base station (e.g., gNB) 20 (or referred to as a network). The communication network system 40 includes one or more UEs 10 and base stations 20. One or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement the functions, processes, and / or methods proposed in this description. The various layers of the wireless interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information for operating the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 for sending and / or receiving wireless signals.

[0029] The processor 11 or 21 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits and / or data processing devices. The memory 12 or 22 may include a read-only memory (ROM), a random access memory (RAM), flash memory, a memory card, a storage medium and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software, the techniques described herein may be implemented by modules (e.g., processes, functions, etc.) that perform the functions described herein. These modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be integrated into the processor 11 or 21, or may be external to the processor 11 or 21, in which case they may be communicatively coupled to the processor 11 or 21 in various known ways.

[0030] In some embodiments, the processor 11 is configured to receive a first signaling from the network 20, wherein the first signaling is used for a multi-transmission reception point (multi-TRP) operation, and / or the transceiver 13 is configured to receive a second signaling from the network 20, wherein the second signaling is used for a multi-TRP operation.

[0031] In some embodiments, the processor 21 is configured to configure a first signaling to the UE 10, wherein the first signaling is used for multi-TRP operation, and / or the transceiver 23 is configured to send a second signaling to the UE 10, wherein the second signaling is used for multi-TRP operation.

[0032] Figure 3 is a flow chart showing a multi-TRP operation method 300 performed by a user equipment according to an embodiment of the present application. In some embodiments, the multi-TRP operation method 300 performed by the UE includes: step 310, configured to receive a first signaling from a network, wherein the first signaling is used for multi-TRP operation, and / or step 320, receiving a second signaling from the network, wherein the second signaling is used for multi-TRP operation.

[0033] Figure 4 It is a flow chart showing a multi-transmission reception point (multi-TRP) operation method 400 performed by a base station (or referred to as a network) according to an embodiment of the present application. In some embodiments, the multi-TRP operation method 400 performed by the network includes: step 410, configuring a first signaling to a UE, wherein the first signaling is used for multi-TRP operation; and / or step 420, transmitting a second signaling to the UE, wherein the second signaling is used for multi-TRP operation.

[0034] In some embodiments, the first signaling configures a list of different joint / downlink (DL) or uplink (UL) transmission configuration indication (TCI) states corresponding to different TRPs, and / or different joint / independent TCI state indications corresponding to different TRPs; the second signaling activates and / or indicates TCI states corresponding to different TRPs, and / or supports switching between joint TCI states and independent TCI states. In some embodiments, the first signaling includes radio resource control (RRC) signaling, and the second signaling includes a medium access control (MAC) control element (CE), downlink control information (DCI) and / or high-level parameters.

[0035] In some embodiments, the MAC CE includes a conventional unified TCI state activation / deactivation MAC CE, which is associated with different time units and activates TCI states corresponding to different TRPs. In some embodiments, in odd time units, the TCI state indicated by the TCI state identifier (ID) field in the conventional unified TCI state activation / deactivation MAC CE is from a first joint / DL or UL TCI state list corresponding to a first TRP; and / or in even time units, the TCI state indicated by the TCI state identifier field is from a second joint / DL or UL TCI state list corresponding to a second TRP.

[0036] In some embodiments, the MAC CE includes a first legacy unified TCI state activation / deactivation MAC control element and a second legacy unified TCI state activation / deactivation MAC CE, which are transmitted simultaneously in the same time unit. In some embodiments, the TCI state indicated by the TCI state identifier (ID) field in the first legacy unified TCI state activation / deactivation MAC CE is from a first joint / downlink (DL) or uplink (UL) TCI state list corresponding to the first TRP, and / or the TCI state indicated by the TCI state identifier field in the second legacy unified TCI state activation / deactivation MAC control element is from a second joint / DL or UL TCI state list corresponding to the second TRP.

[0037] In some embodiments, in at least one of a legacy unified TCI state activation / deactivation MAC CE, a first legacy unified TCI state activation / deactivation MAC control unit, and a second legacy unified TCI state activation / deactivation MAC CE, a first field in an R field is used to indicate an association between a TCI state indicated by a TCI state identifier field and a TRP. In some embodiments, if a first field in an R field indicates a first value, the TCI state indicated by the TCI state identifier field is from a first joint / DL or UL TCI state list corresponding to a first TRP; and / or if the first field indicates a second value, the TCI state indicated by the TCI state identifier field is from a second joint / DL or UL TCI state list corresponding to a second TRP.

[0038] In some embodiments, in at least one of a conventional unified TCI state activation / deactivation MAC CE, a first conventional unified TCI state activation / deactivation MAC control unit, and a second conventional unified TCI state activation / deactivation MAC CE, a TCI state identifier field may be used to activate up to two TCI states corresponding to different TRPs. In some embodiments, in at least one of a conventional unified TCI state activation / deactivation MAC control unit, a first conventional unified TCI state activation / deactivation MAC control unit, and a second conventional unified TCI state activation / deactivation MAC control unit, a second field in the R field is used to indicate whether a TCI state identifier field activates one or two TCI states. In some embodiments, if the number of TCI states indicated by a TCI state identifier field is one, the association between the TCI state and the TRP is indicated by the first field in the R field. In some embodiments, the first field in the R field may also be used to indicate a TRP index.

[0039] In some embodiments, in at least one of a legacy unified TCI state activation / deactivation MAC control unit, a first legacy unified TCI state activation / deactivation MAC control unit, and a second legacy unified TCI state activation / deactivation MAC control unit, all TCI state identifier fields share the first and second fields in the R field, or each TCI state identifier field has the first and second fields in the R field.

[0040] In some embodiments, the DCI includes a first DCI and a second DCI, the first DCI indicating a TCI state from an activated TCI state list corresponding to one TRP, and the second DCI indicating a TCI state from an activated TCI state list corresponding to another TRP. In some embodiments, the first DCI and the second DCI are located in different time units.

[0041] In some embodiments, the DCI simultaneously indicates the TCI state from the activated TCI state list corresponding to one TRP and the TCI state from the activated TCI state list corresponding to another TRP. In some embodiments, a TCI field in the DCI is extended to 4 bits, wherein the added 1 bit is used to indicate the TRP. In some embodiments, a TCI field in the DCI is extended to 6 bits, wherein the first 3 bits are used to indicate the TCI state from the activated TCI state list corresponding to one TRP, and the last 3 bits are used to indicate the TCI state from the activated TCI state list corresponding to another TRP.

[0042] In some embodiments, the DCI includes a downlink (DL) DCI, in which a 1-bit TRP indicator is added to the physical uplink control channel (PUCCH) field to indicate the association between the PUCCH resource and a TRP. In some embodiments, when a user equipment (UE) receives the TRP indicator of the PUCCH field in the DL DCI, the UE sends the PUCCH indicated by the PUCCH field using a TCI state corresponding to the TRP. In some embodiments, the high-level parameters include PUCCH-Resource or PUCCH-ResourceSet, and a 1-bit TRP indicator RRC signaling is added to the high-level parameters to indicate the association between the PUCCH resource or the PUCCH resource set and a TRP. In some embodiments, when the UE receives the PUCCH resource indicator in the DCI, the UE sends the indicated PUCCH using the TCI state corresponding to the TRP according to the TRP indicator RRC signaling in the high-level parameters. In some embodiments, the PUCCH resource or PUCCH resource set is associated with different TRPs, and / or the PUCCH resource or PUCCH resource set is divided into different parts, and the different parts correspond to different TRPs. In some embodiments, the TRP indicator is an explicit TRP index or other index associated with the TRP, such as an index of a CORESET pool, an SRS resource set index, or a CSI-RS resource set index.

[0043] In some embodiments, the high-level parameters are extended to be TRP-specific. In some embodiments, the high-level parameters include unifiedtci-StateType-TRP1 and unifiedtci-StateType-TRP2, where unifiedtci-StateType-TRP1 indicates that the first TRP is in a joint TCI state or an independent TCI state, and unifiedtci-StateType-TRP2 indicates that the second TRP is in a joint TCI state or an independent TCI state. In some embodiments, for multi-TRP operations, the MAC control unit (MAC CE) is used to support dynamic switching between a joint TCI state and an independent TCI state. In some embodiments, the MAC CE has 2 bits, where the first bit indicates whether the TCI state corresponding to the first TRP is joint or independent, and the second bit indicates whether the TCI state corresponding to the second TRP is joint or independent. In some embodiments, the MAC CE is further merged into another MAC CE, which is a unified TCI state activation / deactivation MAC CE.

[0044] Specifications and / or discussions related to Example 1:

[0045] In the current specification, for single TRP operation with a unified TCI framework, a joint / DL TCI state list including M joint / DL TCI states and a UL TCI state list including N UL TCI states are configured in the high-level parameters PDSCH-Config and BWP-UplinkDedicated, respectively. The joint / DL TCI state provides a reference RS for determining QCL information for UL TX spatial filtering of DL signals (including PDSCH, PDCCH, CSI-RS) and / or UL signals (including PUSCH, PUCCH, SRS). The UL TCI state provides a reference RS for determining UL TX spatial filtering. The unified TCI state activation / deactivation MAC control unit (CE) selects several joint / DL TCI states from the joint / DL TCI state list and / or selects several UL TCI states from the UL TCI state list for activation or deactivation. The TCI state field in the DL DCI (e.g., DCI 1_1 and DCI 1_2) indicates one or two TCI states to apply.

[0046] In the current specification, for multi-TRP operation without a unified TCI framework, downlink beam indication and UL TX spatial filtering are completed through TCI state and spatial relationship signaling, respectively. Each DL and UL channel has its own TCI state list and spatial relationship list. For example, the TCI state lists of PDSCH and PDCCH are configured in the high-level parameters PDSCH-Config and PDCCH-Config, respectively. Similarly, the spatial relationship lists of PUCCH and SRS are configured in the high-level parameters PUCCH-Config and SRS-Config, respectively. Different MAC CEs are used for TCI state activation / deactivation of different channels. For example, the UE-specific PDCCH MAC CE of PDCCH uses enhanced TCI state indication; the UE-specific PDSCH MAC CE of PDSCH uses (enhanced) TCI state activation / deactivation; the multi-TRP PUCCH repetition MAC CE of PUCCH uses PUCCH spatial relationship activation / deactivation; and the spatial relationship of PUSCH is determined according to the SRI field in DCI. Specifically, the TCI state field in DL DCI (eg, DCI 1_1 and DCI 1_2) indicates one or two TCI states to be applied to PDSCH reception.

[0047] In Rel-18 WID, a unified TCI framework is introduced for multi-TRP operation. In order to support multi-TRP operation, it is recommended to configure two joint / DL TCI state lists and two UL TCI state lists through RRC parameters. The first and second joint / DL TCI state lists include M1 and M2 joint / DL TCI states, respectively. The first and second UL TCI state lists include N1 and N2 UL TCI states, respectively. The joint / DL TCI states from the first and second joint / DL TCI state lists provide reference RSs corresponding to the first and second TRPs to determine the QCL information and UL TX spatial filtering corresponding to the first and second TRPs. The UL TCI states from the first and second UL TCI state lists provide reference RSs corresponding to the first and second TRPs to determine the UL TX spatial filtering corresponding to the first and second TRPs.

[0048] Examples related to Example 1:

[0049] In some examples, a conventional unified TCI state activation / deactivation MAC CE associated with different time units activates TCI states corresponding to different TRPs. In odd time units, the TCI state indicated by the TCI state identifier field comes from a first joint / DL or UL TCI state list corresponding to a first TRP; in even time units, the TCI state indicated by the TCI state identifier field comes from a second joint / DL or UL TCI state list corresponding to a second TRP. Therefore, the network can activate TCI states corresponding to different TRPs respectively by transmitting MAC CEs in different time units.

[0050] In some examples, two conventional unified TCI state activation / deactivation MAC CEs may be transmitted simultaneously in the same time unit. Specifically, the TCI state indicated by the TCI state identifier field in the previous MAC CE is from the first joint / DL or UL TCI state list corresponding to the first TRP, and the TCI state indicated by the TCI state identifier field in the latter MAC CE is from the second joint / DL or UL TCI state list corresponding to the second TRP. Therefore, the network can simultaneously activate TCI states corresponding to different TRPs by transmitting MAC CEs in the same time unit.

[0051] In some examples, one of the R fields (marked as T) in a conventional unified TCI state activation / deactivation MAC control element (CE) is used to indicate the association between the TCI state indicated by the TCI state identifier field and a TRP. If the T field is "0", the TCI state indicated by the TCI state identifier field comes from a first joint / DL or UL TCI state list corresponding to a first TRP. If the T field is "1", the TCI state indicated by the TCI state identifier field comes from a second joint / DL or UL TCI state list corresponding to a second TRP. Therefore, the network can separately activate TCI states corresponding to different TRPs by adjusting the T field.

[0052] In some examples, a TCI state identifier field in a conventional unified TCI state activation / deactivation MAC control unit can be used to activate up to two TCI states corresponding to different TRPs. One of the TCI states indicated by the TCI state identifier field comes from a first joint / DL or UL TCI state list corresponding to a first TRP, and the other comes from a second joint / DL or UL TCI state list corresponding to a second TRP. The TCI states corresponding to different TRPs do not need to be activated simultaneously every time. To this end, a new field (marked as N) is added to indicate whether the TCI state identifier field activates one or two TCI states. If the number of TCI states indicated by the TCI state identifier field is one, it is necessary to indicate the association between the TCI state and the TRP. Subsequently, a new field (marked as T) is added to indicate the TRP index. Therefore, the network can determine whether to activate the TCI states corresponding to different TRPs simultaneously or individually. Figure 5 Two examples of MAC control units are shown. Figure 5 In (a), all TCI status identifier fields share an N field and a T field. Figure 5 In (b), each TCI status identifier field has a corresponding N field and T field.

[0053] Specifications and / or discussions related to Example 2:

[0054] In the current specification, for single TRP operation with a unified TCI framework, a unified TCI state activation / deactivation MAC control unit is used to activate / deactivate the joint / DL TCI state and / or the UL TCI state. For simplicity, the joint / DL TCI state and the UL TCI state are collectively referred to as the TCI state. The set of these activated TCI states can be referred to as the activated TCI state list. After the TCI state is activated, a TCI field (3 bits) in the DCI indicates the TCI state from the activated TCI state list for determining QCL information and / or UL TX spatial filtering.

[0055] In Rel-18 WID, a unified TCI framework is introduced for multi-TRP operation. Due to the existence of multiple TRPs, the two TCI states corresponding to the two TRPs are activated by two MAC control units or two parts of one MAC control unit, respectively. Therefore, there are two activated TCI state lists corresponding to the two TRPs, respectively. For multi-TRP operation based on a single DCI, only one TRP can transmit PDCCH, so there is only one DCI corresponding to one of the TRPs at any point in time. Therefore, this DCI needs to indicate the two TCI states from the two activated TCI state lists at the same time. Therefore, some mechanisms need to be introduced to enable the DCI to indicate two TCI states. It should be noted that these mechanisms are not only applicable to multi-TRP operation based on a single DCI, but also to multi-TRP operation based on multiple DCIs.

[0056] Examples related to Example 2:

[0057] In some examples, one DCI indicates a TCI state corresponding to one TRP from one activated TCI state list, and another DCI indicates a TCI state corresponding to another TRP from another activated TCI state list. The two DCIs may be in different time units. The user equipment (UE) distinguishes which DCI indicates the TCI state corresponding to which TRP based on the time unit information. Figure 6 An example of this mechanism is shown. The first MAC control element (CE) activates several TCI states corresponding to the first TRP. In the first time unit, the UE receives the first DCI. If the TCI field in the first DCI is "001", it indicates the first TCI state corresponding to the first TRP in the first activated TCI state list. After the application time, the UE applies this new TCI state to receive downlink signals from the first TRP and sends uplink signals to the first TRP. The second MAC control element activates several TCI states corresponding to the second TRP. In the second time unit, the UE receives the second DCI. If the TCI field in the second DCI is "010", it indicates the third TCI state corresponding to the second TRP in the second activated TCI state list. After the application time, the UE applies this new TCI state to receive downlink signals from the second TRP and sends uplink signals to the second TRP. In addition, the first and second time units can be odd and even time slots, respectively.

[0058] In some examples, a DCI simultaneously indicates the TCI state corresponding to one TRP from one activated TCI state list and the TCI state corresponding to another TRP from another activated TCI state list. An example of such a mechanism is Figure 7As shown. The first MAC control unit activates several TCI states corresponding to the first TRP. The second MAC control unit activates several TCI states corresponding to the second TRP. At the first time point, the UE receives the first DCI. If the TCI field in the first DCI is "010", it indicates the third TCI state corresponding to the first TRP in the first activated TCI state list, and the third TCI state corresponding to the second TRP in the second activated TCI state list. After the application time, the UE applies the two new TCI states to receive downlink signals from the first TRP and the second TRP, and sends uplink signals to the first TRP and the second TRP.

[0059] In some examples, the TCI field in the DCI is extended to 4 bits. The additional 1 bit is used to indicate the TRP. This method is more flexible and clear. An example of this mechanism is as follows Figure 8 As shown. The first MAC control unit (CE) activates several TCI states corresponding to the first TRP. At the first time point, the UE receives the first DCI. If the TCI field in the first DCI is "0001", it indicates the first TCI state corresponding to the first TRP in the first activated TCI state list. After the application time, the UE applies this new TCI state to receive downlink signals from the first TRP and sends uplink signals to the first TRP. The second MAC control unit activates several TCI states corresponding to the second TRP. At the second time point, the UE receives the second DCI. If the TCI field in the second DCI is "1010", it indicates the third TCI state corresponding to the second TRP in the second activated TCI state list. After the application time, the UE applies this new TCI state to receive downlink signals from the second TRP and sends uplink signals to the second TRP.

[0060] In some examples, the TCI field in the DCI is extended to 6 bits. The first 3 bits are used to indicate the TCI state corresponding to one TRP from one activated TCI state list, and the last 3 bits are used to indicate the TCI state corresponding to another TRP from another activated TCI state list. An example of this mechanism is as follows Fig. 9As shown. The first MAC control unit activates several TCI states corresponding to the first TRP. The second MAC control unit activates several TCI states corresponding to the second TRP. At the first time point, the UE receives the first DCI. If the TCI field in the first DCI is "001010", it indicates the first TCI state corresponding to the first TRP in the first activated TCI state list, and the third TCI state corresponding to the second TRP in the second activated TCI state list. After the application time, the UE applies the two new TCI states to receive downlink signals from the first TRP and the second TRP, and sends uplink signals to the first TRP and the second TRP.

[0061] Specifications and / or discussions related to Example 3:

[0062] In the current specification, each UL channel is configured with a channel-specific spatial relation list, and each UL channel has a channel-specific MAC control element (CE) to select which spatial relation to apply. Specifically, the spatial relation list for PUCCH is configured in the higher-layer parameter PUCCH-SpatialRelationInfo, and the (enhanced) PUCCH spatial relation activation / deactivation MAC control element selects the spatial relation to apply. For multi-TRP operation without a unified TCI framework, the spatial relation is associated with one TRP, so the UE can know to which TRP to send the PUCCH based on the applied spatial relation.

[0063] In Rel-18 WID, a unified TCI framework is introduced for multi-TRP operation. For multi-TRP operation with a unified TCI framework, the TCI states and indicative MAC control elements are not channel-specific. Typically, two TCI states corresponding to two TRPs are applied for UL transmission. The UE cannot determine to which TRP the PUCCH is sent based on the applied TCI states. Therefore, some mechanisms need to be introduced to indicate to which TRP the PUCCH is sent. It should be noted that these mechanisms can also be applied to other UL signals such as PUSCH and SRS.

[0064] Examples related to Embodiment 3:

[0065] In some examples, a 1-bit TRP indicator for PUCCH added in DCI (e.g., DCI format 1_1, DCI format 1_2) can be used to indicate the association between PUCCH resources and TRP. The TRP indicator can be an explicit TRP index or other index related to TRP, such as an index of a CORESET pool, an SRS resource set index, or a CSI-RS resource set index. When the UE receives the TRP indicator for PUCCH in the DCI, the UE sends the PUCCH indicated by the PUCCH resource indication field of the DCI using the TCI state corresponding to the TRP. For example, when the TRP indicator and the PUCCH resource indication field of the PUCCH in DCI format 1_1 are "0" and "000" respectively, the UE sends the first PUCCH using the TCI state corresponding to the first TRP.

[0066] In some examples, a 1-bit TRP indicator RRC signaling is added in the high-level parameters PUCCH-Resource or PUCCH-ResourceSet to indicate the association between a PUCCH resource or a PUCCH resource set and a TRP. The TRP indicator can be an explicit TRP index, an index of a CORESET pool, an SRS resource set index, or a CSI-RS resource set index. When the UE receives the PUCCH resource indicator in the DCI, the UE sends the indicated PUCCH using the TCI state corresponding to the TRP according to the TRP indicator RRC signaling in the PUCCH-Resource or PUCCH-ResourceSet. For example, when the TRP indicator RRC signaling in the PUCCH resource is configured as "0" and the PUCCH resource indication field in the DCI format 1_1 is "000", the UE sends the first PUCCH using the TCI state corresponding to the first TRP.

[0067] In some examples, a PUCCH resource or a PUCCH resource set may be implicitly associated with different TRPs. A PUCCH resource or a PUCCH resource set may be divided into two parts, with different parts corresponding to different TRPs. Fig.10 Two classification methods are shown. For example, when the PUCCH resource indication field in DCI format 1_1 is "000", the UE sends the first PUCCH using the TCI state corresponding to the first TRP. When the PUCCH resource indication field in DCI format 1_1 is "011", the UE sends the fourth PUCCH using the TCI state corresponding to the second TRP.

[0068] Specifications and / or discussions related to Example 4:

[0069] In the current specification, for single TRP operation with a unified TCI framework, the switching between the joint TCI state and the independent TCI state is not dynamic, but is configured through the high-level parameter unifiedtci-StateType.

[0070] Examples related to Example 4:

[0071] In some examples, for multi-transmission reception point (multi-TRP) operation, it is proposed to extend the high-level parameters to be TRP-specific. For example, the high-level parameter unifiedtci-StateType-TRP1 indicates whether the first TRP is in the joint TCI state or the independent TCI state, and the high-level parameter unifiedtci-StateType-TRP2 indicates whether the second TRP is in the joint TCI state or the independent TCI state.

[0072] In some examples, for multi-TRP operation, it is proposed to use a MAC control unit (CE) to support dynamic switching between a joint TCI state and an independent TCI state. For example, a MAC CE uses 2 bits, where the first bit indicates whether the TCI state corresponding to the first TRP is joint or independent, and the second bit indicates whether the TCI state corresponding to the second TRP is joint or independent. The MAC CE can also be merged into another MAC CE, such as a unified TCI state activation / deactivation MAC CE.

[0073] In summary, some embodiments of the present application provide some solutions for activating and indicating TCI states in multi-TRP operations with a unified TCI framework. Two joint / DL or UL TCI state lists are established in RRC signaling. Different joint / DL or UL TCI state lists correspond to different TRPs, respectively. Several methods for activating TCI states from TCI state lists corresponding to different TRPs are proposed. Several methods for indicating TCI states from activated TCI state lists corresponding to different TRPs are proposed. Several methods for indicating which TRP the PUCCH is sent to are proposed. The advantages of some embodiments include at least one of the following: 1. Two joint / DL or UL TCI state lists corresponding to different TRPs are established in RRC signaling. 2. Several methods for activating TCI states from TCI state lists corresponding to different TRPs are proposed. 3. Several methods for indicating TCI states from activated TCI state lists corresponding to different TRPs are proposed. 4. Several methods for indicating which TRP the PUCCH is sent to are proposed.

[0074] Fig.11 7 is a block diagram of an exemplary wireless communication system 700 according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Fig.11 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other at least as shown. The application circuit 730 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor, an application processor. The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0075] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A method for multiple transmission reception point (TRP) operation, performed by a user equipment (UE), characterized in that: include: configured to receive first signaling from a network, wherein the first signaling is for multi-TRP operation; and / or A second signaling is received from the network, wherein the second signaling is used for multi-TRP operation.

2. The method according to claim 1, characterized in that The first signaling configuration corresponds to different joint / downlink DL or uplink UL transmission configuration indication TCI state lists corresponding to different TRPs and / or different joint / independent TCI state indications corresponding to different TRPs; and / or The second signaling activates and / or indicates TCI states corresponding to different TRPs and / or supports switching between a joint TCI state and an independent TCI state.

3. The method according to claim 1 or 2, characterized in that: The first signaling includes radio resource control RRC signaling, and the second signaling includes medium access control MAC control element CE, downlink control information DCI and / or high-layer parameters.

4. The method according to claim 3, characterized in that The MAC CE includes a traditional unified TCI state activation / deactivation MAC CE, the traditional unified TCI state activation / deactivation MAC CE is associated with different time units, and the traditional unified TCI state activation / deactivation MAC CE activates the TCI state corresponding to the different TRPs.

5. The method according to claim 4, characterized in that In odd time units, the TCI state indicated by the TCI state identifier ID field in the traditional unified TCI state activation / deactivation MAC CE comes from the first joint / DL or UL TCI state list corresponding to the first TRP, and / or in even time units, the TCI state indicated by the TCI state ID field comes from the second joint / DL or UL TCI state list corresponding to the second TRP.

6. The method according to claim 3, characterized in that The MAC CE includes a first legacy unified TCI state activation / deactivation MAC CE and a second legacy unified TCI state activation / deactivation MAC CE that are simultaneously transmitted in the same time unit.

7. The method according to claim 6, characterized in that The TCI state indicated by the TCI state ID field in the first traditional unified TCI state activation / deactivation MAC CE comes from the first joint / DL or UL TCI state list corresponding to the first TRP, and / or the TCI state indicated by the TCI state ID field in the second traditional unified TCI state activation / deactivation MAC CE comes from the second joint / DL or UL TCI state list corresponding to the second TRP.

8. The method according to any one of claims 4 to 7, characterized in that In at least one of the traditional unified TCI state activation / deactivation MAC CE, the first traditional unified TCI state activation / deactivation MAC CE and the second traditional unified TCI state activation / deactivation MAC CE, the first field in the R field is used to indicate the association between a TCI state indicated by a TCI state ID field and a TRP.

9. The method according to claim 8, characterized in that If the first field in the R field indicates a first value, the TCI state indicated by the TCI state ID field comes from a first joint / DL or UL TCI state list corresponding to a first TRP, and / or if the first field in the R field indicates a second value, the TCI state indicated by the TCI state ID field comes from a second joint / DL or UL TCI state list corresponding to a second TRP.

10. The method according to any one of claims 4 to 9, characterized in that In at least one of the traditional unified TCI state activation / deactivation MAC CE, the first traditional unified TCI state activation / deactivation MAC CE and the second traditional unified TCI state activation / deactivation MAC CE, a TCI state ID field is used to activate up to two TCI states corresponding to different TRPs.

11. The method according to claim 10, characterized in that In at least one of the traditional unified TCI state activation / deactivation MAC CE, the first traditional unified TCI state activation / deactivation MAC CE and the second traditional unified TCI state activation / deactivation MAC CE, the second field in the R field is used to indicate that a TCI state ID field activates one or two TCI states.

12. The method according to claim 11, characterized in that If the number of TCI states indicated by the one TCI state ID field is one, the association between the TCI state and the TRP is indicated by the first field in the R field.

13. The method according to claim 12, characterized in that The first field in the R field is also used to indicate a TRP index.

14. The method according to any one of claims 4 to 13, characterized in that In at least one of the traditional unified TCI state activation / deactivation MAC CE, the first traditional unified TCI state activation / deactivation MAC CE, and the second traditional unified TCI state activation / deactivation MAC CE, all TCI state ID fields share the first field and the second field in the R field, or each TCI state ID field has the first field and the second field in the R field.

15. The method according to claim 3, characterized in that The DCI includes a first DCI indicating a TCI state from an activated TCI state list corresponding to one TRP and a second DCI indicating a TCI state from an activated TCI state list corresponding to another TRP.

16. The method according to claim 15, characterized in that The first DCI and the second DCI are located in different time units.

17. The method according to claim 3, characterized in that The DCI simultaneously indicates the TCI state from the activated TCI state list corresponding to one TRP and the TCI state from the activated TCI state list corresponding to another TRP.

18. The method according to claim 3, characterized in that A TCI field in the DCI is extended to 4 bits, wherein an additional bit among the 4 bits is used to indicate the TRP.

19. The method according to claim 3, characterized in that A TCI field in the DCI is extended to 6 bits, wherein the first 3 bits are used to indicate the TCI state from the activated TCI state list corresponding to one TRP, and the last 3 bits are used to indicate the TCI state from the activated TCI state list corresponding to another TRP.

20. The method according to claim 3, characterized in that The DCI includes DL DCI, in which a 1-bit TRP indicator is added to the physical uplink control channel PUCCH field to indicate the association between the PUCCH resource and a TRP.

21. The method according to claim 20, characterized in that When the UE receives the TRP indicator of the PUCCH field in the DL DCI, the UE sends PUCCH using a TCI state corresponding to the TRP.

22. The method according to claim 3, characterized in that The high-level parameters include PUCCH-Reousrce or PUCCH-ResourceSet, and a 1-bit TRP indicator RRC signaling is added to the high-level parameters to indicate the association between a PUCCH resource or a PUCCH resource set and a TRP.

23. The method according to claim 22, characterized in that When the UE receives the PUCCH resource indicator in the DCI, the UE sends the indicated PUCCH using the TCI state corresponding to the TRP according to the TRP indicator RRC signaling in the high-level parameters.

24. The method according to claim 23, characterized in that The PUCCH resource or the PUCCH resource set is associated with the different TRP, and / or the PUCCH resource or the PUCCH resource set is divided into different parts, and the different parts correspond to the different TRPs.

25. The method according to claim 3, characterized in that The higher layer parameters are extended to be TRP specific.

26. The method according to claim 25, characterized in that The high-level parameters include unifiedtci-StateType-TRP1 and unifiedtci-StateType-TRP2, unifiedtci-StateType-TRP1 indicates that the first TRP is the joint TCI state or the independent TCI state, and unifiedtci-StateType-TRP2 indicates that the second TRP is the joint TCI state or the independent TCI state.

27. The method according to claim 3, characterized in that For multi-TRP operation, the MAC CE is used to support dynamic switching between the joint TCI state and the independent TCI state.

28. The method according to claim 27, characterized in that The MAC CE has 2 bits, wherein the first bit of the 2 bits indicates whether the TCI state corresponding to the first TRP is joint or independent, and the second bit indicates whether the TCI state corresponding to the second TRP is joint or independent.

29. The method according to claim 27 or 28, characterized in that The MAC CE is further merged into another MAC CE, which is a unified TCI state activation / deactivation MAC CE.

30. A method for multiple transmission reception point (TRP) operation, performed by a network, characterized in that: include: Configuring a first signaling to a user equipment UE, wherein the first signaling is used for a multi-TRP operation; and / or Transmitting a second signaling to the UE, wherein the second signaling is used for multi-TRP operation.

31. A user equipment, characterized in that: include: Memory; Transceiver; a processor coupled to the memory and the transceiver; The processor is configured to perform the method of any one of claims 1 to 29.

32. A network, characterized in that include: Memory; Transceiver; a processor coupled to the memory and the transceiver; Wherein the processor is configured to perform the method of claim 30.

33. A non-transitory machine-readable storage medium, characterized in that Instructions are stored, and when a computer executes the instructions, the computer performs the method of any one of claims 1 to 30.

34. A chip, characterized in that: include: A processor configured to call and run a computer program stored in a memory so as to enable a device on which the chip is mounted to perform the method according to any one of claims 1 to 30.

35. A computer-readable storage medium, characterized in that: A computer program is stored, the computer program causing a computer to execute the method according to any one of claims 1 to 30.

36. A computer program product, characterized in that A computer program is included, wherein the computer program causes a computer to perform the method of any one of claims 1 to 30.

37. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 30.

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