Method and apparatus for reference signal port resource configuration

Abstract

The embodiment of the invention discloses a method and a device for configuring reference signal (RS) port resources in a multi-transmission receiving point scene. A terminal device receives a coherent joint transmission (CJT) configuration indicating information about an RS port resource to be measured, where the information about the RS port resource to be measured is associated with at least a portion of a code division multiplexing (CDM) group, or a CDM sequence, or both the CDM group and the CDM sequence. The terminal device then measures the associated RS port resources based on the CJT configuration. In this manner, the terminal device measures only a portion of the configured RS port resources without estimating the entire available RS port resources. Therefore, the terminal device can have lower channel measurement complexity.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of communications, and in particular, to methods, devices, apparatuses, and computer-readable storage media for reference signal (RS) port resource configuration. Background Art

[0002] With the development of communication technology, coherent joint transmission (CJT) of multiple transmission reception points (TRPs) is introduced to improve communication robustness and transmission efficiency. For CJT, a layer is coherently transmitted from multiple TRPs. Therefore, the terminal device needs to obtain the integrated downlink channel matrix across multiple TRPs by configuring one or more non-zero power (NZP) channel state information reference signal CSI-RS resources.

[0003] In a possible solution for CJT, a single CSI-RS resource can be configured for a terminal device to support downlink channel measurements across a maximum number of coordinated TRPs. A single CSI-RS resource can include multiple subsets, each associated with a different TRP. However, in such a solution, the CSI-RS resource configuration needs to be enhanced to improve communication efficiency. Summary of the invention

[0004] In general, example embodiments of the present disclosure provide a method, apparatus, and computer-readable storage medium for channel state information reference signal (CSI-RS) resource configuration.

[0005] In a first aspect, a terminal device is provided. The terminal device may include one or more transceivers; and one or more processors. The one or more processors are communicatively coupled to the one or more transceivers, and the one or more transceivers are configured to enable the terminal device to: receive a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and based on the CJT configuration, measure the associated RS port resources.

[0006] In a second aspect, a network device is provided. The network device may include one or more transceivers; and one or more processors. The one or more processors are communicatively coupled to the one or more transceivers, and the one or more transceivers are configured to enable the network device to: send a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and receive a measurement report of the RS port resources, wherein the measurement report is related to the RS port resources indicated in the CJT configuration.

[0007] In a third aspect, a method implemented at a terminal device is provided. The method may include: receiving a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about RS port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and based on the CJT configuration, measuring the associated RS port resources.

[0008] In a fourth aspect, a method implemented at a network device is provided. The method may include: sending a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and receiving a measurement report of the RS port resources, wherein the measurement report is related to the RS port resources indicated in the CJT configuration.

[0009] In a fifth aspect, a device of a terminal device is provided. The device may include: a component for receiving a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and a component for measuring the associated RS port resources based on the CJT configuration.

[0010] In a sixth aspect, a device of a network device is provided. The device may include: a component for sending a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and a component for receiving a measurement report of the RS port resources, wherein the measurement report is related to the RS port resources indicated in the CJT configuration.

[0011] In a seventh aspect, a terminal device is provided. The terminal device may include at least one processor; and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the terminal device to: receive a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and based on the CJT configuration, measure the associated RS port resources.

[0012] In an eighth aspect, a network device is provided. The network device may include at least one processor; and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the network device to: send a coherent joint transmission CJT configuration, the CJT configuration indicating information about reference signal RS port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: code division multiplexing CDM groups, or CDM sequences, or both CDM groups and CDM sequences; and receive a measurement report of the RS port resources, wherein the measurement report is related to the RS port resources indicated in the CJT configuration.

[0013] In a ninth aspect, a non-transitory computer-readable medium is provided, the non-transitory computer-readable medium comprising program instructions for causing an apparatus to execute a method according to at least the third aspect or the fourth aspect.

[0014] It should be understood that the invention summary is not intended to identify the key or essential features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Some example embodiments will now be described with reference to the accompanying drawings, in which:

[0016] Figure 1illustrates an example network environment in which example embodiments of the present disclosure may be implemented;

[0017] Figure 2 A flowchart of a method implemented at a terminal device according to some embodiments of the present disclosure is illustrated;

[0018] Figure 3 illustrates an example port resource group configuration that may be used in example embodiments of the present disclosure;

[0019] Figure 4 A flowchart of a method implemented at a network device according to some other embodiments of the present disclosure is illustrated;

[0020] Figure 5 illustrates a simplified block diagram of an apparatus suitable for implementing embodiments of the present disclosure; and

[0021] Figure 6 A block diagram of an example computer-readable medium is illustrated in accordance with some embodiments of the present disclosure.

[0022] Throughout the drawings, the same or similar reference numerals refer to the same or similar elements. DETAILED DESCRIPTION

[0023] The principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described only for illustrative purposes and help those skilled in the art to understand and implement the present disclosure, and do not represent any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in various other ways except for the way described below.

[0024] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0025] In this disclosure, references to "one embodiment," "an embodiment," and "an example embodiment" indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment must include the particular feature, structure, or characteristic. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, those skilled in the art believe that it is within the knowledge of those skilled in the art to affect such feature, structure, or characteristic in conjunction with other embodiments, whether or not explicitly described.

[0026] It should be understood that although the terms "first" and "second" etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the example embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0027] The terms used herein are only used to describe specific embodiments and are not intended to limit the example embodiments. As used herein, the singular forms "a", "an", and "the" also include the plural forms, unless the context clearly indicates otherwise. It is further understood that the terms "comprises", "comprising", "has", "having", "includes", and / or "including" when used herein specify the presence of the features, elements, and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0028] As used in this application, the term "circuitry" may refer to one, more, or all of the following:

[0029] (a) a pure hardware circuit implementation (such as an implementation using only analog and / or digital circuitry), and

[0030] (b) a combination of hardware circuitry and software such as (where applicable):

[0031] (i) a combination of analog and / or digital hardware circuits and software / firmware, and

[0032] (ii) any portion of hardware processor(s) (including digital signal processor(s)) with software, software and memory(s) that work together to cause a device (such as a mobile phone or server) to perform various functions), and

[0033] (c) Hardware circuits and / or processor(s), such as microprocessor(s) or portions of microprocessor(s), that require software (e.g., firmware) to operate, but which may not be present when the software is not required for operation.

[0034] This definition of circuitry applies to all uses of the term in this application, including in any claims. As another example, as used in this application, the term circuitry also covers an implementation of only a hardware circuit or processor (or multiple processors) or a portion of a hardware circuit or processor and its accompanying software and / or firmware. For example, if applicable to a particular claim element, the term circuitry also covers a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device.

[0035] As used herein, the term "communication network" refers to a network that complies with any suitable communication standard, such as Long Term Evolution (LTE), Advanced LTE (LTE-A), Wideband Code Division Multiplexing (WCDMA), High Speed ​​Packet Access (HSPA), Narrowband Internet of Things (NB-IoT), etc. In addition, the communication between the terminal device and the network device in the communication network can be performed according to any suitable generation of communication protocol, including but not limited to the third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocol and / or higher generation communication protocol. The embodiments of the present disclosure can be applied to various communication systems. In view of the rapid development of communication, there will certainly be communication technologies and systems that can be used to embody future types of the present disclosure. It should not be regarded as limiting the scope of the present disclosure to the above-mentioned systems.

[0036] As used herein, the term "network device" refers to a node in a communication network, via which a terminal device accesses the network and receives services from the network. Depending on the terminology and technology applied, a network device may refer to a base station (BS) or an access point (AP), such as a Node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a NR NB (also known as a gNB), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), a relay, a low-power node (such as a femto, a pico), etc.

[0037] The term "terminal device" refers to any terminal device capable of wireless communication. As an example and not limitation, the terminal device may also be referred to as a communication device, a user equipment (UE), a subscriber station (SS), a portable subscriber station, a mobile station (MS) or an access terminal (AT). The terminal device may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet computer, a wearable terminal device, a personal digital assistant (PDA), a portable computer, a desktop computer, an image capture terminal device (such as a digital camera), a game terminal device, a music storage and playback device, a vehicle-mounted wireless terminal device, a wireless endpoint, a mobile station, a laptop embedded device (LEE), a laptop mounted device (LME), a USB dongle, a smart device, a wireless customer premises equipment (CPE), an Internet of Things (IoT) device, a watch or other wearable device, a head mounted display (HMD), a vehicle, a drone, medical equipment and applications (e.g., remote surgery), industrial equipment and applications (e.g., robots and / or other wireless devices operating in industrial and / or automated processing chain environments), consumer electronic devices, equipment operating on commercial and / or industrial wireless networks, etc. In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" may be used interchangeably.

[0038] As used herein, the term "TRP" refers to a transmission receiving point with an antenna array (with one or more antenna elements) located at a specific geographical location on the network side, which can be used to send and / or receive signals to and from a terminal device. In one embodiment of the present disclosure, a TRP may refer to a network device with physical functions, including but not limited to a macro cell, a micro cell, an RRH, an integrated access and backhaul (IAB) node, a relay, a femto node, a micro node, and the like. Physical functions may include, for example, encoding / decoding, precoding, modulation / demodulation, and the like. Although some embodiments of the present disclosure are described with reference to, for example, four TRPs, these embodiments are for illustrative purposes only and help those skilled in the art to understand and implement the present disclosure without imposing any limitation on the scope of the present disclosure. It should be understood that the present disclosure described herein may be implemented in various ways other than those described below.

[0039] As used herein, the term "RS (CSI-RS) resource" may indicate resources that can be used for RS (CSI-RS) transmission in the time domain, frequency domain, and code domain. A single RS (CSI-RS) resource may support multiple ports (e.g., 32), and each port may be referred to as an RS port. RS (CSI-RS) port resources may include one or more resource elements (REs) of one or more REs and / or antenna elements in RS resources and / or code resources for forming an RS port. Multiple ports may be further divided into port resource groups; each port resource group may correspond to a different TRP and include one or more ports for a TRP. A TRP may correspond to a specific transmission configuration indication (TCI), or a TCI may be used to identify a specific TRP. Each port resource group may correspond to a TCI. TRP and TCI may be used interchangeably in the present disclosure.

[0040] As used herein, the term "CDM" refers to a multiplexing method that uses an orthogonal cover code (OCC) to distinguish each original signal so that multiple CSI-RS ports can share the same time-frequency resources, specifically the resource elements (REs) defined in 3GPP TS 38.211. CDM can have multiple types, such as noCDM (size is 1, mapped to only one resource element RE), fd-CDM2 (size is 2, extended on 2 REs in the frequency domain FD), cdm4-FD2-TD2 (size is 4, extended on 2 REs in FD and on 2 REs in the time domain TD), and cdm8-FD2-TD4 (size is 8, extended on 2 REs in FD and on 4 REs in TD). The CDM type can be obtained from the parameter "cdm type" in RRC.

[0041] As used herein, the term "CDM group" may correspond to a specific CDM type, such as noCDM, fd-CDM2, cdm4-FD2-TD2, or cdm8-FD2-TD4. The term "CDM group size" refers to the number of CDM sequences per CDM group. A CDM sequence refers to the OCC used in CDM. Multiple CSI-RS ports may be multiplexed in a CDM group, and more CSI-RS ports may be supported by using more than one CDM group.

[0042] As described above, in a possible solution for CJT, a single CSI-RS resource can be configured for a terminal device to support downlink channel measurements across a maximum number of coordinated TRPs. A single CSI-RS resource can include multiple subsets, each subset being associated with a different TRP, where a TRP can be identified by, for example, a TCI.

[0043] For example, according to Technical Specification (TS) 38.211, a terminal device should assume that CSI-RS is transmitted using antenna port p numbered according to the following equation and subsequent Table 1:

[0044] p=3000+s+jL (1)

[0045] j=0、1、……、N / L-1

[0046] s=0、1、……、L-1

[0047] in,

[0048] L∈{1,2,4,8} is the CDM group size (or the number of CDM sequences per CDM group), s is the CDM sequence index provided by, for example, Table 2 for L=4, and N is the total number of CSI-RS ports.

[0049] The CDM group index j given in Table 1 corresponds to the time / frequency of a given row in the table

[0050] Location

[0051] • CDM groups are numbered in order of increasing frequency domain allocation first and then increasing time domain allocation.

[0052] • The indices k' and l' index the REs within a CDM group.

[0053] Time domain position l0 or l1 and frequency domain position k i Provided by high-level parameters.

[0054] • The total number of CSI-RS ports N is equal to the number of CDM groups (N / L) multiplied by the size of the CDM group (L).

[0055] For illustration purposes, an example Table 1 of CSI-RS positions and an example Table 2 of CDM sequences are given below.

[0056] Table 1: CSI-RS position within a slot (Table 7.4.1.5.3-1 in TS 38.211)

[0057]

[0058]

[0059] Table 2: Sequence w with cdm type equal to 'cdm4-FD2-TD2' f (k′) and w t (l′) (Table 7.4.1.5.3-4 in TS 38.211)

[0060] index <![CDATA[[w f (0) in f (1)]]]> <![CDATA[[w t (0) in t (1)]]]> 0 [+1 +1] [+1 +1] 1 [+1 -1 [+1 +1] 2 [+1 +1] [+1 -1] 3 [+1 -1] [+1 -1]

[0061] Typically, the terminal device needs to measure the complete CSI-RS port resources according to the provisions of the current specification, extract the partial port resource group according to the actual served TRP or the indication of the serving cell, and then report the corresponding precoding matrix indicator (PMI) to the gNB side. However, in such a solution, the CSI-RS resource configuration needs to be enhanced to improve communication efficiency.

[0062] According to an embodiment of the present disclosure, a solution for CSI-RS port resource configuration is provided. In this solution, a terminal device receives a CJT configuration indicating information about the RS port resources to be measured. The information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing CDM group, or a CDM sequence, or both a CDM group and a CDM sequence. In addition, the terminal device measures the associated RS port resources based on the CJT configuration. Therefore, in an embodiment of the present disclosure, the terminal device can be directly configured with a specific portion of the CSI-RS port within the CSI-RS port resource according to the actual served TRP, and then the UE only measures the partial CSI-RS port indicated in the CJT configuration, without estimating the entire CSI-RS port of the CSI-RS port resource. Therefore, the terminal device has a lower channel measurement complexity.

[0063] The following will refer to Figures 1 to 6 An example embodiment of the CSI-RS port resource configuration of the present disclosure is described.

[0064] Figure 1 An example network environment 100 is illustrated in which example embodiments of the present disclosure may be implemented. The environment 100, which may be part of a communication network, includes terminal devices and network devices.

[0065] like Figure 1 As shown, the network environment 100 may include a first device 110 (hereinafter also referred to as UE 110 or terminal device 110). The network environment 100 may also include a second device 120, a third device 130, a fourth device 140, and a fifth device 150 (hereinafter also referred to as network devices 120, 130, 140 and 150, or TRPs 120, 130, 140 and 150, etc.). The terminal device 110 may be configured to communicate with the network via one or more of TRPs 120, 130, 140 and 150. In CJT, the terminal device may be served by one or more of TRPs 120, 130, 140 and 150 at the same time. In the network environment 100, the link from the terminal device 110 to the network device 120 is called an uplink UL or a reverse link, and the link from the network device 120 to the terminal device 110 is called a downlink DL or a forward link.

[0066] It should be understood that the number of network devices, terminal devices, or TRPs is for illustrative purposes only and does not represent any limitation. System 100 may include any suitable number of network devices, terminal devices, or TRPs suitable for implementing embodiments of the present disclosure. Although not shown, it should be understood that one or more terminal devices may be located in environment 100.

[0067] Communications in the network environment 100 may be implemented according to any appropriate (multiple) communication protocols, including but not limited to third generation (3G), fourth generation (4G), fifth generation (5G) or beyond 5G, wireless local area network communication protocols (such as Institute of Electrical and Electronics Engineers (IEEE) 802.11, etc.), and / or any other protocols currently known or to be developed in the future. In addition, communications may utilize any appropriate wireless communication technology, including but not limited to: multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), Bluetooth, ZigBee and machine type communication (MTC), enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), carrier aggregation (CA), dual connectivity (DC) and new radio unlicensed (NR-U) technology.

[0068] Figure 2 FIG. 2 is a flow chart of a method 200 implemented at a terminal device according to some embodiments of the present disclosure. For the purpose of discussion, reference will be made to Figure 1 The method 200 is described from the perspective of the terminal device 110. It should be understood that the method 200 may also include additional blocks not shown and / or omit some of the shown blocks, and the scope of the present disclosure is not limited in this regard.

[0069] At box 210, the terminal device 110 may receive a coherent joint transmission CJT configuration indicating information about a reference signal RS port resource to be measured, wherein the information about the RS port resource to be measured is associated with at least a portion of the following items: a code division multiplexing CDM group, or a CDM sequence, or both a CDM group and a CDM sequence. In other words, the terminal device may obtain information about which RS port needs to be measured based on the CJT configuration. It should be noted that the CJT configuration is for illustration only, and the present disclosure is not limited thereto; it may also be referred to as a configuration of the CJT, an RS measurement configuration, a first configuration, etc.

[0070] In some embodiments, the CJT configuration may be indicated by means of a medium access control element MAC CE. In other embodiments, the CJT configuration may be indicated by means of a downlink control indication DCI.

[0071] In some embodiments, the terminal device 100 can be configured to communicate with one or more of the multiple transmission reception points TRPs for CJT. The RS port resources to be measured are at least a portion of the RS port resources available for multiple TRPs (e.g., a total of 32 ports in the CSI-RS resources). The RS port resources available for multiple TRPs include multiple RS port resource groups, each RS port resource group can correspond to a TRP in the multiple TRPs, and each RS port resource group can be associated with a subset of one or more subsets of the following items: CDM group, CDM sequence, or both CDM group and CDM sequence.

[0072] For example, the terminal device 110 may be configured to communicate with four TRPs, and 32 RS ports may be available for the four TRPs. In this case, the 32 RS ports may be evenly or unevenly divided into 4 RS port resource groups, each RS port resource group corresponding to one TRP.

[0073] In some embodiments, the information about the RS port resources to be measured may include any of the following: one or more indices of an RS port resource group; one or more indices of each TRP associated with an RS port resource group; or one or more transmission configuration indication TCI state identifiers, each TCI state identifier being associated with an RS port resource group or a TRP. In other words, the index of the RS port resource group, the index of the TRP, or the TCI state identifier may be directly or indirectly associated with a subset of the RS port resources.

[0074] As described above, for example, in equation 1), the RS port can be determined based on the CDM group index j and the CDM sequence index s. Therefore, an association between any one of the RS port resource group, TRP or TCI and a subset of the CDM group, CDM sequence, or both the CDM group and the CDM sequence can be provided. In this case, the terminal device can know the index of the CDM group or the index of the CDM sequence or both from the information in the CJT configuration, and then determine the CSI-RS port to be measured based on equation 1).

[0075] The association may be a predetermined table known to both the terminal device and the network device. Alternatively, it may be configured to the terminal device via, for example, radio resource control RRC signaling and / or MAC CE.

[0076] In some embodiments, the terminal device may also be caused to obtain an RS port resource association configuration, which indicates an association between any one of an RS port resource group, a TRP or a TCI and a CDM group, a CDM sequence, or a subset of both a CDM group and a CDM sequence. Note that the RS port resource association configuration is named only for illustrative purposes, and the present disclosure is not limited thereto. For example, it may also be referred to as an RS port association configuration, a CDM parameter association configuration, an association configuration, a second configuration, or any other suitable name.

[0077] It should be noted that a CDM group, a CDM sequence, or a subset of both a CDM group and a CDM sequence may be associated with any of an RS port resource group, a TRP, or a TCI. For illustrative purposes only, an example implementation is described by taking mapping an RS port resource group to a CDM group or a CDM sequence as an example.

[0078] Example Implementation 1 - Port Resource Group Configuration Based on CDM Group

[0079] In one example, the terminal device 110 can be configured to communicate with 4 TRPs, and 32 RS ports can be available for the four TRPs. The CDM group size L can be, for example, 4, and 8 CDM groups are required, indexed from 0 to 7. The 32 RS ports can be evenly divided into 4 RS port resource groups, indexed from 0 to 3, and each RS port resource group corresponds to one TRP. The 4 port resource groups can be associated with 8 CDM groups, and each port resource group can be mapped to 2 CDM groups.

[0080] In this case, the mapping relationship between the port resource group and the CDM group (and thus the CSI-RS port) can be given according to p=3000+s+4j, where s=0, 1, . . . , L-1 and L=4.

[0081] Port resource group #0 is associated with CDM group index j∈{0,1}, and the CSI-RS port index corresponds to {3000,3001,3002,3003,3004,3005,3006,3007}. Port resource group #1 is associated with CDM group index j∈{2,3}, and the CSI-RS port index corresponds to {3008,3009,3010,3011,3012,3013,3014,3015}. Port resource group #2 is associated with CDM group index j∈{4,5}, and the CSI-RS port index corresponds to {3016,3017,3018,3019,3020,3021,3022,3023}. Port resource group #3 is associated with CDM group index j∈{6,7}, and CSI-RS port indexes correspond to {3024,3025,3026,3027,3028,3029,3030,3031}.

[0082] In the above embodiment, the RS port resource group may include the same number of RS port resources. However, the RS port resource group may include different numbers of RS port resources. In some embodiments, different TRPs may support different numbers of CSI-RS ports, which means that each TRP or port resource group may be mapped to a subset of CDM groups of varying sizes. For example, port resource group #0 may be mapped to CDM group {0, 1, 2}, port resource group #1 may be mapped to CDM group {3}, port resource group #2 may be mapped to CDM group {4, 5, 6}, and port resource group #3 may be mapped to CDM group {7}.

[0083] Example Implementation 2 - Port Resource Group Configuration Based on CDM Sequence

[0084] In this example, similar to example implementation 1, the terminal device 110 can be configured to communicate with 4 TRPs, and 32 RS ports can be available for the four TRPs. The CDM group size L=4, and 8 CDM groups are required, indexed from 0 to 7. The difference is that the 32 RS ports can be evenly divided into 4 RS port resource groups, indexed from 0 to 3, and each RS port resource group corresponds to one TRP. The 4 port resource groups can be associated with 4 CDM sequences, and each port resource group can be mapped to one CDM sequence.

[0085] In this case, the mapping relationship between the port resource group and the CSI-RS port can be given according to p=3000+s+4j, where j=0, 1, . . . , N / L-1, and N=32, L=4.

[0086] Port resource group #0 is associated with CDM sequence s=0

[0087] The CSI-RS port index corresponds to {3000,3004,3008,3012,3016,3020,

[0088] 3024,3028}.

[0089] Port resource group #1 is associated with CDM sequence s=1

[0090] The CSI-RS port index corresponds to {3001,3005,3009,3013,3017,3021,

[0091] 3025,3029}.

[0092] Port resource group #2 is associated with CDM sequence s=2

[0093] The CSI-RS port index corresponds to {3002,3006,3010,3014,3018,3022,

[0094] 3026,3030}.

[0095] Port resource group #3 is associated with CDM sequence s=3

[0096] The CSI-RS port index corresponds to {3003,3007,3011,3015,3019,3023,

[0097] 3027,3031}.

[0098] Note that there may be some exceptions to Example Implementation 2. In one example, if the CDM group size L=1, Example Implementation 1 may be used. In other words, a port resource group may be associated with a CDM group instead of a CDM sequence.

[0099] In another example, if the CDM group size L=2, 4, the port resource group can be configured simultaneously based on, for example, 2 CDM groups and 2 CDM sequences. In other words, an association can be established between the port resource group and a combination of the CDM group and the CDM sequence.

[0100] In another example, the terminal device 110 can be configured to communicate with three TRPs, and the 32 RS ports can be divided into 3 RS port resource groups, each RS port resource group corresponding to one TRP. Since L∈{1, 2, 4, 8}, the 3 port resource groups cannot be uniformly mapped to L CDM sequences. In this case, the port resource group can be associated with the CDM group instead of the CDM sequence.

[0101] Example Implementation 3 - Port Resource Group Configuration Based on CDM Group and CDM Sequence

[0102] In this example, similar to the above two example implementations, the terminal device 110 can be configured to communicate with four TRPs, and 32 RS ports can be available for the four TRPs. The CDM group size L=4, and 8 CDM groups are required, indexed from 0 to 7. Differently, the 32 RS ports can be evenly divided into 4 RS port resource groups, indexed from 0 to 3, each resource group corresponding to a TRP. The 4 port resource groups can be associated with a combination of CDM groups and CDM sequences, such as Figure 3 As shown in Figure 1, each port resource group is mapped to four CDM groups and two CDM sequences.

[0103] In this case, the mapping relationship between the port resource group and the CSI-RS port can be given according to p=3000+s+4j, where s=0, ..., 3, and j=0, ..., 7.

[0104] Port resource group #0 is associated with CDM group index j∈{0, 1, 2, 3} and CDM sequence s∈{0, 1}. The CSI-RS port index corresponds to {3000, 3001, 3004, 3005, 3008, 3009, 3012, 3013}.

[0105] Port resource group #1 is associated with CDM group index j∈{0, 1, 2, 3} and CDM sequence s∈{2, 3}. The CSI-RS port index corresponds to {3002, 3003, 3006, 3007, 3010, 3011, 3014, 3015}.

[0106] Port resource group #2 is associated with CDM group index j∈{4, 5, 6, 7} and CDM sequence s∈{0, 1}. The CSI-RS port index corresponds to {3016, 3017, 3020, 3021, 3024, 3025, 3028, 3029}.

[0107] Port resource group #3 is associated with CDM group index j∈{4,5,6,7} and CDM sequence s∈{2,3}

[0108] The CSI-RS port index corresponds to {3018,3019,3022,3023,3026,3027,

[0109] 3030,3031}.

[0110] In another example, different TRPs may have different numbers of CSI-RS ports, and in this case, each TRP or port resource group may be mapped to a different subset of combinations of CDM groups and CDM sequences of varying sizes suitable for the port number of the TRP.

[0111] Then refer to Figure 2 At block 220 , the terminal device 110 may measure the associated RS port resources based on the CJT configuration.

[0112] In some embodiments, the RS port resources to be measured indicated in the CJT configuration are determined based on information about the RS port resources to be measured and the associations indicated in the RS port resource association configuration.

[0113] In some other embodiments, the terminal device 110 is also caused to receive another CJT configuration, which indicates an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence. The index of the CDM group, the index of the CDM sequence, or the index of both a CDM group and a CDM sequence indicated in the other CJT configuration may correspond to a subset of RS port resources associated with information about RS port resources to be measured (such as an index of a TRP, an index of a port resource group, or a TCI status indicator) indicated in a previous CJT configuration (i.e., the CJT configuration described in reference box 210). Note that the other CJT configuration is named for illustrative purposes only, and the present disclosure is not limited thereto. Alternatively, it may also be referred to as another configuration of CJT, another RS ​​measurement configuration, a third configuration, etc.

[0114] In some embodiments, the CJT configuration may be received via a medium access control element MAC CE. In other embodiments, the CJT configuration may be received via a downlink control indication DCI.

[0115] In some embodiments, another CJT configuration may be included in the same MAC CE along with the CJT configuration as described in block 210. Alternatively, they may be carried in separate MAC CEs or separate signals.

[0116] In one example, the mapping relationship has been specified in the RRC signaling, and the index of the TRP, the index of the port resource group, or the index of the TCI status indicator to be measured has been indicated in the L2MAC CE. Then, the index of the CDM group associated with the actual measurement port can be further indicated by a bitmap or combined signaling at another L2 MAC CE according to the above-mentioned coordinated TRP or port resource group mapping relationship. For example, according to the RRC signaling, the number of CDM groups of TRP i is L i , but the actual number of CDM groups configured is x, then

[0117] The gNB can configure a bitmap for the CDM group. i x bits are "1" and the other bits are "0", or the gNB can

[0118] bits for CDM group configuration combined signaling.

[0119] In another example, the mapping relationship has been specified in the RRC signaling, the index of the TRP, the index of the port resource group, or the index of the TCI state indicator to be measured has been indicated in the L2MAC CE, and therefore the index of the CDM sequence associated with the actual measurement port can be further indicated by a bitmap or combined signaling at another L2MAC CE according to the above-mentioned coordinated TRP or port resource group mapping relationship. For example, according to the RRC signaling, the number of CDM sequences is M i , but the actual number of CDM sequence configurations is y, then

[0120] The gNB configures a bitmap for the CDM sequence. i Of the y bits, y bits are "1" and the other bits are "0", or the gNB passes bits are used for CDM sequence configuration combined signaling.

[0121] In another embodiment, the index of the CDM group and CDM sequence associated with the actual measurement port can be further indicated by a bitmap or combined signaling at another L2 MAC CE according to the above-mentioned mapping relationship of the coordinated TRP or port resource group. The bitmap or combined signaling can be implemented in a manner similar to that described in the first two paragraphs above.

[0122] In this case, the RS port resources actually to be measured may be determined based on information about the RS port resources to be measured indicated in the CJT configuration, an association indicated in the RS port resource association configuration, and an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence indicated in another CJT configuration. Therefore, considering low implementation complexity on the UE side or energy saving on the gNB side, the network device 120 may configure fewer CSI-RS ports than usual.

[0123] In the above, some embodiments based on CSI-RS port resource association are described, and in some other embodiments, the information about the RS port resource to be measured as described in block 210 may be implemented in different ways without any mapping relationship or association.

[0124] In some embodiments, the information about the RS port resources to be measured as described in 210 may directly include an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence. Thus, the terminal device may learn the CSI-RS port as indicated based on equation 1).

[0125] In some embodiments, no mapping relationship is specified, the CDM group to be measured is already indicated in the L2 MAC CE, and the index of the CDM group associated with the actual measurement port can also be indicated by a bitmap or combined signaling. For example, each CDM group has N CSI-RS ports and L CDM sequences, so there are CDM groups. If the actual number of configured CDM groups is x, then

[0126] The gNB can configure a bitmap for the CDM group, where x bits out of N / L bits in the bitmap are "1" and the other bits are "0", or the gNB can configure a bitmap for the CDM group by

[0127] bits configure the combined signal for the CDM group.

[0128] In another example, no mapping relationship is specified, the CDM sequence to be measured is already indicated in the L2 MAC CE, and the index of the CDM sequence associated with the actual measurement port can also be indicated by a bitmap or combined signaling at the L2 MAC CE. Each CDM group has N CSI-RS ports and L CDM sequences, so there are CDM groups. If the actual number of configured CDM sequences is y, then

[0129] The gNB configures a bitmap for the CDM sequence, where y bits of the L bits in the bitmap are "1" and the other bits are "0", or the gNB bits are used for CDM sequence configuration combined signaling.

[0130] In this way, the network device 120 can use the downlink layer 2 medium access control control element (L2 MACCE) to let the UE know which CDM groups or CDM sequences will be explicitly measured without knowing the mapping relationship performed by RRC signaling. In addition, the RS port resources to be measured indicated in the CJT configuration can be determined based on the index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence. In addition, TCI can be provided together with the index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence. In this way, it can provide greater flexibility in CSI-RS resource configuration.

[0131] Similarly, the CJT configuration may be received via a medium access control element MAC CE or a downlink control indication DCI.

[0132] In some embodiments, the RS may include a channel state information reference signal CSI-RS, and the RS port resources may include port resources of the CSI-RS. However, the CSI-RS is given only for the purpose of illustration and the present disclosure, but may be applied to any RS signal having similar problems.

[0133] Figure 4 FIG. 4 is a flowchart of a method 400 implemented at a network device according to some embodiments of the present disclosure. For discussion purposes, reference will be made to Figure 1 The method 400 is described from the perspective of the network device 120 or 130 or 140 or 150. It should be understood that the method 400 may also include additional blocks not shown and / or omit some of the blocks shown, and the scope of the present disclosure is not limited in this regard.

[0134] At block 410, the network device 120 sends a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of the following items: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence. In other words, the network device 120 may indicate information about the RS port resources to be measured. The RS port resources may correspond to a portion of a CDM group, or a CDM sequence, or both a CDM group and a CDM sequence.

[0135] In some embodiments, the terminal device 110 can be configured to communicate with one or more TRPs of a transmission reception point TRP for CJT, wherein the RS port resources to be measured are at least a portion of the RS port resources available for multiple TRPs, and wherein the RS port resources available for multiple TRPs include multiple RS port resource groups, each RS port resource group corresponds to a TRP in the multiple TRPs, and each RS port resource group is associated with a subset of one or more subsets of a CDM group, a CDM sequence, or both a CDM group and a CDM sequence.

[0136] In some embodiments, information about the RS port resources to be measured may include any of the following: one or more indices of RS port resource groups, one or more indices of TRPs, each index being associated with an RS port resource group, one or more transmission configuration indication TCI state identifiers, each TCI state identifier being associated with an RS port resource group or TRP.

[0137] In some embodiments, the network device 120 may also be enabled to indicate an RS port resource association configuration indicating an association between any of an RS port resource group, TRP, or TCI and a subset of a CDM group, a CDM sequence, or both a CDM group and a CDM sequence.

[0138] In some embodiments, the RS port resources to be measured indicated in the CJT configuration may be determined based on information about the RS port resources to be measured and the associations indicated in the RS port resource association configuration.

[0139] In some embodiments, the network device 120 may also be caused to send another CJT configuration indicating: an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence, wherein the index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence indicated in the other CJT configuration is used together with the information about the RS port resources to be measured indicated in the CJT configuration and the association indicated in the RS port resource association configuration to determine the RS port resources actually to be measured.

[0140] In some embodiments, a RS port resource group may include the same number of RS port resources.

[0141] In some embodiments, RS port resource groups may include different numbers of RS port resources.

[0142] In some embodiments, the information about the RS port resources to be measured may include an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence.

[0143] In some embodiments, the RS port resources to be measured indicated in the CJT configuration may be determined based on: an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence.

[0144] In some embodiments, the CJT configuration may be sent via a medium access control element MAC CE or a downlink control indication DCI.

[0145] In some embodiments, the RS port resource association configuration may be sent via RRC or MAC CE.

[0146] In some embodiments, the RS may include a channel state information reference signal CSI-RS, wherein the RS port resource may include a port resource of the CSI-RS.

[0147] At block 420 , the network device 120 receives a measurement report of the RS port resources, wherein the measurement report is associated with the RS port resources indicated in the CJT configuration.

[0148] Figure 5 is a simplified block diagram of a device 500 suitable for implementing embodiments of the present disclosure. The device 500 may be provided to implement a communication device, such as Figure 1 The terminal device 110, the network device 120 or 130 or 140 or 150 are shown. As shown in the figure, the device 500 includes one or more processors 510, and one or more transmitters and / or receivers (TX / RX) 540 coupled to the processor 510. The device 500 may also include one or more memories 520 coupled to the processor 510.

[0149] TX / RX 540 may be used for bidirectional communication. TX / RX 540 has at least one antenna to facilitate communication. The communication interface may represent any interface required for communication with other network elements.

[0150] Processor 510 may be of any type suitable for the local technology network, and may include, as non-limiting examples, one or more of: a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 500 may have multiple processors, such as application specific integrated circuit chips that are time slaved to a clock synchronized with a main processor.

[0151] The memory 520 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, read-only memory (ROM) 524, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact disks (CDs), digital video disks (DVDs), and other magnetic storage devices and / or optical storage devices. Examples of volatile memories include, but are not limited to, random access memory (RAM) 522 and other volatile memories that do not persist during power outages.

[0152] Computer program 530 includes computer executable instructions executed by associated processor 510. Program 530 may be stored in ROM 524. Processor 6 may perform any suitable actions and processes by loading program 630 into RAM 522.

[0153] The embodiments of the present disclosure may be implemented by a program 530, so that the device 500 may execute the reference Figures 2 to 4 Any process of the present disclosure discussed. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

[0154] In some embodiments, the program 530 may be tangibly contained in a computer-readable medium, which may be included in the device 500 (such as in the memory 520) or in other storage devices accessible to the device 500. The device 500 may load the program 530 from the computer-readable medium to the RAM 522 for execution. The computer-readable medium may include any type of tangible non-volatile memory, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. Figure 6 An example of a computer readable medium 600 in the form of a CD or DVD is shown. The computer readable medium has a program 630 stored thereon.

[0155] Generally, various embodiments of the present disclosure may be implemented using hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented using hardware, while other aspects may be implemented using firmware or software that may be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are illustrated and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that, as non-limiting examples, the blocks, devices, systems, techniques, or methods described herein may be implemented using hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0156] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer executable instructions, such as instructions included in a program module, which are executed in a device on a target real or virtual processor to perform the above reference Figure 2-4 The method 200 or 400 described. Typically, a program module includes a routine, program, library, object, class, component, data structure, etc. that performs a specific task or implements a specific abstract data type. In various embodiments, the functions of the program modules can be combined or split between program modules as needed. The machine executable instructions of the program modules can be executed in a local or distributed device. In a distributed device, the program modules can be located in both local and remote storage media.

[0157] The program code for executing the method of the present disclosure can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device so that the program code is implemented when executed by the processor or controller in the flow chart and / or the block diagram. The program code can be executed completely on the machine, partially on the machine, as an independent software package, partially on the machine and partially on a remote machine, or completely on a remote machine or server.

[0158] In the context of the present disclosure, computer program codes or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of carriers include signals, computer readable media, etc.

[0159] The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. A more specific example of a computer readable storage medium will include an electrical connection with one or more wires, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0160] In addition, although the operations are described in a particular order, this should not be understood as requiring such operations to be performed in the particular order shown or in order or performing all the operations shown to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be interpreted as limitations on the scope of the present disclosure, but rather descriptions of features that may be specific to a particular embodiment. Certain features described in the context of a separate embodiment may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0161] Although the disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features or acts described above are disclosed as example forms of implementing the claims.

Claims

1. A terminal device, comprising: one or more transceivers; as well as One or more processors are communicatively coupled to the one or more transceivers, and the one or more processors are configured to cause the terminal device to: Receiving a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and Based on the CJT configuration, the associated RS port resources are measured.

2. The terminal device according to claim 1, wherein the terminal device is configured to communicate with one or more of a plurality of transmission reception points TRPs for CJT, wherein the RS port resources to be measured are at least a portion of RS port resources available for a plurality of TRPs, and The RS port resources available for the multiple TRPs include multiple RS port resource groups, each RS port resource group corresponds to a TRP among the multiple TRPs, and each RS port resource group is associated with a subset of one or more subsets of the following items: a CDM group, a CDM sequence, or both a CDM group and a CDM sequence.

3. The terminal device according to claim 1 or 2, wherein the information about the RS port resources to be measured comprises any one of the following: One or more indices of RS port resource groups, One or more indices of a TRP, each index being associated with an RS port resource group, One or more transmission configuration indication TCI state identifiers, each TCI state identifier is associated with an RS port resource group or TRP.

4. The terminal device according to claim 3, wherein the terminal device is further configured to: An RS port resource association configuration is obtained, wherein the RS port resource association configuration indicates an association between any one of the RS port resource group, the TRP, or the TCI and a CDM group, a CDM sequence, or a subset of both the CDM group and the CDM sequence. 5 . The terminal device according to claim 4 , wherein the RS port resource to be measured indicated in the CJT configuration is determined based on the information about the RS port resource to be measured and the association indicated in the RS port resource association configuration.

6. The terminal device according to claim 4, wherein the terminal device is further configured to: receiving another CJT configuration indicating an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence corresponding to a subset of RS port resources to be measured indicated in the CJT configuration, wherein the RS port resource actually to be measured is determined based on the information about the RS port resource to be measured indicated in the CJT configuration, the association indicated in the RS port resource association configuration, and the index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence indicated in the other CJT configuration, and / or The another CJT configuration is received by means of a medium access control element MAC CE or a downlink control indication DCI.

7. The terminal device according to claims 2 to 6, wherein the RS port resource group includes the same number of RS port resources.

8. The terminal device according to claims 2 to 6, wherein the RS port resource group includes different numbers of RS port resources.

9. The terminal device according to claim 1, wherein the information about the RS port resources to be measured comprises: The index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence.

10. The terminal device according to claim 9, wherein the RS port resource to be measured indicated in the CJT configuration is determined based on: an index of the CDM group, an index of the CDM sequence, or an index of both the CDM group and the CDM sequence.

11. The terminal device according to any one of claims 1 to 10, wherein the CJT configuration is received by means of a medium access control element MAC CE or a downlink control indication DCI.

12. The terminal device according to claims 4 to 8, wherein the RS port resource association configuration is received by means of radio resource control RRC signaling, or MAC CE.

13. The method according to any one of claims 1 to 12, wherein the RS comprises a channel state information reference signal CSI-RS, and The RS port resources include CSI-RS port resources.

14. A network device comprising: one or more transceivers; as well as one or more processors communicatively coupled to the one or more transceivers, and the one or more processors are configured to cause the network device to: sending a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and A measurement report of an RS port resource is received, wherein the measurement report is related to the RS port resource indicated in the CJT configuration.

15. The network device of claim 14, wherein the terminal device is configured to communicate with one or more of a plurality of transmission reception points (TRPs) for the CJT, wherein the RS port resources to be measured are at least a portion of RS port resources available for a plurality of TRPs, and The RS port resources available for the multiple TRPs include multiple RS port resource groups, each RS port resource group corresponds to a TRP among the multiple TRPs, and each RS port resource group is associated with a subset of one or more subsets of the following items: a CDM group, a CDM sequence, or both a CDM group and a CDM sequence.

16. The network device according to claim 14 or 15, wherein the information about the RS port resources to be measured comprises any one of the following: One or more indices of RS port resource groups, One or more TRP indices, each associated with an RS port resource group, One or more transmission configuration indication TCI state identifiers, each TCI state identifier is associated with an RS port resource group or TRP.

17. The network device of claim 16, wherein the network device is further configured to: Indicates an RS port resource association configuration, wherein the RS port resource association configuration indicates: an association between any one of the RS port resource group, the TRP or the TCI and a CDM group, a CDM sequence, or a subset of both the CDM group and the CDM sequence.

18. The network device according to claim 17, wherein the RS port resource to be measured indicated in the CJT configuration is determined based on the information about the RS port resource to be measured and the association indicated in the RS port resource association configuration.

19. The network device of claim 17, wherein the network device is further configured to: sending another CJT configuration, the another CJT configuration indicating: an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence corresponding to a subset of RS port resources to be measured indicated in the CJT configuration, wherein an index of a CDM group, an index of a CDM sequence, or an index of both a CDM group and a CDM sequence indicated in the other CJT configuration is used together with the information about the RS port resource to be measured indicated in the CJT configuration and the association indicated in the RS port resource association configuration to determine the RS port resource actually to be measured, and / or The another CJT configuration is received by means of a medium access control element MAC CE or a downlink control indication DCI.

20. The network device according to claims 15 to 19, wherein the RS port resource groups include the same number of RS port resources.

21. The network device according to claims 15 to 19, wherein the RS port resource groups include different numbers of RS port resources.

22. The network device according to claim 14, wherein the information about the RS port resources to be measured comprises: The index of the CDM group, the index of the CDM sequence, or the index of both the CDM group and the CDM sequence.

23. The network device of claim 22, wherein the RS port resource to be measured indicated in the CJT configuration is determined based on: an index of the CDM group, an index of the CDM sequence, or an index of both the CDM group and the CDM sequence.

24. The network device according to any one of claims 14 to 23, wherein the CJT configuration is transmitted by means of a medium access control element MAC CE or a downlink control indication DCI.

25. The network device according to claims 17 to 18, wherein the RS port resource association configuration is sent by means of RRC or MAC CE. 26 . The network device according to claim 17 , wherein the RS comprises a channel state information reference signal (CSI-RS), and wherein the RS port resource comprises a port resource of the CSI-RS.

27. A method at a terminal device, comprising: Receiving a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and Based on the CJT configuration, the associated RS port resources are measured.

28. A method at a network device, comprising: sending a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and A measurement report of an RS port resource is received, wherein the measurement report is related to the RS port resource indicated in the CJT configuration.

29. A terminal device, comprising: means for receiving a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and Means for measuring associated RS port resources based on the CJT configuration.

30. A device for a network device, comprising: Means for sending a coherent joint transmission (CJT) configuration, the CJT configuration indicating information about reference signal (RS) port resources to be measured, wherein the information of the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and Means for receiving a measurement report of an RS port resource, wherein the measurement report is related to the RS port resource indicated in the CJT configuration.

31. A terminal device, comprising: at least one processor; as well as at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the terminal device to: Receiving a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and Based on the CJT configuration, the associated RS port resources are measured.

32. A network device comprising: at least one processor; as well as at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the network device to: sending a coherent joint transmission (CJT) configuration indicating information about reference signal (RS) port resources to be measured, wherein the information about the RS port resources to be measured is associated with at least a portion of: a code division multiplexing (CDM) group, or a CDM sequence, or both a CDM group and a CDM sequence; and A measurement report of an RS port resource is received, wherein the measurement report is related to the RS port resource indicated in the CJT configuration.

33. A non-transitory computer readable medium comprising program instructions for causing an apparatus to at least perform the method according to claim 27 or 28.

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