Terminal device, network device and method

Abstract

The embodiments of the present disclosure relate to a method, an apparatus, and a computer-readable medium for communication. A terminal device in which a first set and a second set of antenna ports are configured receives a DCI for scheduling uplink transmission. The DCI includes a first SRI and a second SRI. The terminal device determines a first set of antenna port indexes based on a first number of layers of uplink transmission indicated by the first SRI and an index of an SRS resource in the first set of SRS resources, and determines a second set of antenna port indexes based on an index of an SRS resource in the second set of SRS resources, a second number of layers of uplink transmission indicated by the second SRI, and a number of SRS resources in the first set of SRS resources. Then, the terminal device performs uplink transmission on antenna ports corresponding to the first and second sets of antenna port indexes. In this manner, simultaneous transmission between multiple panels is properly supported.

Description

[Technical field]

[0001] FIELD Exemplary embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly, to a communication method, apparatus, and computer-readable medium for simultaneous transmission between multiple panels (STxMP). [Background technology]

[0002] Non-codebook-based (NCB-based) physical uplink shared channel (PUSCH) transmission is an uplink transmission scheme that utilizes downlink (DL)-uplink (UL) channel reciprocity. In the case of NCB-based PUSCH transmission, the network device can transmit a channel state information-reference signal (CSI-RS) or indicate a UL beam to the terminal device, and the terminal device can determine a UL precoder based on the measurement of the CSI-RS or the indicated UL beam without a predefined precoding matrix.

[0003] Currently, it is proposed to place multiple panels on the terminal device. In the conventional assumption, even if the terminal device is equipped with multiple panels, the terminal device can transmit on only one panel at a time. To improve the transmission performance, support for STxMP technology is expected. Although there are some discussions on STxMP, there are still some open issues to be discussed so that NCB-based PUSCH STxMP can be better supported. Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, the exemplary embodiments of the present disclosure provide a communication method, apparatus, and computer storage medium for STxMP. [Means for solving the problem]

[0005] In a first aspect, a communication method is provided. The method includes receiving downlink control information (DCI) for scheduling uplink transmission in a terminal device in which a first set and a second set of antenna ports are configured, determining a first set of antenna port indexes based on a first number of layers of the uplink transmission and an index of an SRS resource in a first set of sounding reference signal (SRS) resources, determining a second set of antenna port indexes based on an index of an SRS resource in a second set of SRS resources, a second number of layers of the uplink transmission and the number of SRS resources in the first set of SRS resources, and performing uplink transmission on antenna ports in the first set and the second set of antenna ports corresponding to the first and second set of antenna port indexes. The DCI includes a first SRS resource indicator and a second SRS resource indicator. The first number of layers is a number of layers transmitted in the first set of antenna ports and is indicated by the first SRS resource indicator. The second number of layers is a number of layers transmitted in the second set of antenna ports and is indicated by the second SRS resource indicator.

[0006] In a second aspect, a communication method is provided. The method includes receiving a DCI for scheduling an uplink transmission in a terminal device in which a first set and a second set of antenna ports are configured, determining a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in the first set of SRS resources, and a number of SRS resources in the first set of SRS resources, and performing the uplink transmission on a set of antenna ports in the first set and the second set of antenna ports corresponding to the set of antenna port indexes. The DCI includes an SRS resource indicator. The number of layers is the number of layers transmitted on each of the first set and the second set of antenna ports and is indicated by the SRS resource indicator.

[0007] In a third aspect, a communication method is provided, the method including: determining, in a terminal device, a default capability value set associated with a bandwidth portion (BWP) configured for the terminal device, and performing at least one of: applying the default capability value set to perform an initial transmission with a network device, or applying the default capability value set according to a determination that a fallback condition is satisfied, to perform an uplink transmission by applying the default capability value set.

[0008] In a fourth aspect, a communication method is provided. The method includes: transmitting, in a network device, a DCI for scheduling uplink transmission to a terminal device in which a first set and a second set of antenna ports are configured; determining a first set of antenna port indexes based on a first number of layers of the uplink transmission and indexes of SRS resources in the first set of SRS resources; determining a second set of antenna port indexes based on indexes of SRS resources in the second set of SRS resources, a second number of layers of the uplink transmission and number of SRS resources in the first set of SRS resources; and performing uplink transmission on antenna ports in the first set and the second set of antenna ports corresponding to the first and second set of antenna port indexes. The DCI includes a first SRS resource indicator and a second SRS resource indicator. The first number of layers is a number of layers transmitted in the first set of antenna ports and is indicated by the first SRS resource indicator. The second number of layers is a number of layers transmitted in the second set of antenna ports and is indicated by the second SRS resource indicator.

[0009] In a fifth aspect, a communication method is provided. The method includes: transmitting, in a network device, a DCI for scheduling uplink transmission to a terminal device in which a first set and a second set of antenna ports are configured; determining a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in the first set of SRS resources, and a number of SRS resources in the first set of SRS resources; and performing uplink transmission on a set of antenna ports in the first set and the second set of antenna ports corresponding to the set of antenna port indexes. The DCI includes an SRS resource indicator. The number of layers is the number of layers transmitted on each of the first set and the second set of antenna ports and is indicated by the SRS resource indicator.

[0010] In a sixth aspect, a communication method is provided, the method including: determining, in a network device, a default capability value set for a terminal device associated with a BWP configured for the terminal device, and performing at least one of: applying the default capability value set to perform an initial transmission with the terminal device, or applying the default capability value set to perform an uplink transmission according to a determination that a fallback condition is satisfied.

[0011] In a seventh aspect, there is provided a terminal device, the terminal device including a processor configured to cause the terminal device to execute a method according to any one of the first to third aspects of the present disclosure.

[0012] In an eighth aspect, there is provided a network device, the network device including a processor configured to cause the network device to execute a method according to any one of the fourth to sixth aspects of the present disclosure.

[0013] In a ninth aspect, there is provided a computer readable medium having stored thereon instructions which, when executed on at least one processor, cause the at least one processor to perform a method according to any of the first to sixth aspects of the present disclosure.

[0014] It should be understood that this Summary of the Invention is not intended to identify key features or essential features of the embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will be readily apparent through the following description. [Brief description of the drawings]

[0015] The above and other objects, features and advantages of the present disclosure will become more apparent from the detailed description of several embodiments of the present disclosure in the accompanying drawings.

[0016] [Figure 1A] 1 illustrates an exemplary communications network in which embodiments of the present disclosure may be implemented;

[0017] [Figure 1B] 2 illustrates another exemplary communications network in which embodiments of the present disclosure may be implemented.

[0018] [Figure 1C] 1 illustrates yet another exemplary communications network in which embodiments of the present disclosure may be implemented.

[0019] [Figure 2A] 1 illustrates a signaling flow for scheduling NCB-based PUSCH transmissions in which embodiments of the present disclosure can be implemented.

[0020] [Figure 2B] An example of the coherent type is shown below.

[0021] [Figure 2C] An example of the full power mode is shown.

[0022] [Figure 3A] 1 illustrates an example of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented.

[0023] [Figure 3B] 1 illustrates an example of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented.

[0024] [Figure 3C] 1 illustrates an example of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented.

[0025] [Figure 4A] An example of an antenna structure compatible with the hybrid beamforming type is shown.

[0026] [Figure 4B] An example of an antenna structure compatible with the hybrid beamforming type is shown.

[0027] [Figure 4C] An example of an antenna structure compatible with the hybrid beamforming type is shown.

[0028] [Figure 4D] An example of an antenna structure compatible with the hybrid beamforming type is shown.

[0029] [Diagram 5] 1 shows a schematic diagram illustrating a communication process according to some exemplary embodiments of the present disclosure.

[0030] [Figure 6] 1 shows a schematic diagram illustrating another communication process according to some exemplary embodiments of the present disclosure.

[0031] [Figure 7] 1 shows a schematic diagram illustrating yet another communication process according to some exemplary embodiments of the present disclosure;

[0032] [Figure 8] 1 illustrates a flowchart of an example method performed by a terminal device according to some embodiments of the present disclosure.

[0033] [Figure 9] 1 illustrates a flowchart of an example method performed by a terminal device according to some embodiments of the present disclosure.

[0034] [Figure 10] 1 illustrates a flowchart of an example method performed by a terminal device according to some embodiments of the present disclosure.

[0035] [Figure 11] 4 illustrates a flowchart of an example method performed by a network device according to some embodiments of the present disclosure.

[0036] [Figure 12] 4 illustrates a flowchart of an example method performed by a network device according to some embodiments of the present disclosure.

[0037] [Figure 13] 4 illustrates a flowchart of an example method performed by a network device according to some embodiments of the present disclosure.

[0038] [Figure 14] FIG. 1 is a schematic block diagram of an apparatus suitable for practicing embodiments of the present disclosure.

[0039] Throughout the drawings, the same or similar reference numbers represent the same or similar elements. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] The principles of the present disclosure will be described with reference to some embodiments. It should be understood that these embodiments are merely described for illustrative purposes to assist those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitations on the scope of the present disclosure. The present disclosure described herein can be implemented in various ways other than those described below.

[0041] In the following description and claims, unless defined otherwise, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0042] In this specification, the term "terminal device" refers to any device having wireless or wired communication capabilities. Examples of terminal devices include user equipment (UE), personal computers, desktops, mobile phones, mobile phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, internet of things (IoT) devices, ultra-reliable low latency communication (URLLC) devices, internet of everything (IoE) devices, machine type communication (MTC) devices, vehicle-mounted devices for V2X communication (where X stands for pedestrian, vehicle, or infrastructure / network), integrated access and backhaul (IAB), small data transmission (SDT), mobility, multicast broadcast services (MBS), positioning, dynamic / flexible duplexing in commercial networks, devices for reduced capability (RedCap), high altitude platforms (HAPs) including unmanned aerial systems (UASs) and spacecraft or aircraft in non-terrestrial networks (NTNs) including satellites, and extended reality (XR) including different types of reality such as augmented reality (AR), mixed reality (MR), and virtual reality (VR). Examples of such devices include, but are not limited to, Reality (VR) devices, unmanned aerial vehicles (UAVs) that do not require a human pilot, commonly known as drones, devices on high speed trains (HST), imaging devices such as digital cameras, sensors, gaming devices, music storage and playback devices, or Internet appliances that allow wireless or wired Internet access and browsing. A "terminal device" may also have multicast / broadcast capabilities to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast distribution, IPTV, smart TV, wireless services, wireless software distribution, group communication, and IoT applications. It may also incorporate one or more subscriber identity modules (SIMs), known as multi-SIMs.The term "terminal equipment" may be used interchangeably with UE, mobile station, subscriber equipment, mobile terminal, user terminal, or wireless equipment.

[0043] The term "network device" refers to a device capable of providing or hosting a cell or coverage through which terminal devices can communicate. Examples of network devices include, but are not limited to, a Node B (NodeB or NB), an Evolved Node B (eNodeB or eNB), a next generation Node B (gNB), a transmit / receive point (TRP), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS), a network-controlled repeater (NCR), etc.

[0044] A terminal device or a network device may have an artificial intelligence (AI) or machine learning function, which generally includes a model that can be used to learn from a large amount of data collected for a specific function and predict some information.

[0045] The terminal device or network device may function in multiple frequency ranges, e.g., FR1 (410 MHz-7125 MHz), FR2 (24.25 GHz-71 GHz), higher than 100 GHz, Terahertz (THz), etc. Furthermore, it can function in licensed / unlicensed / shared spectrum. The terminal device may have multiple connections with the network device in a multi-radio dual connectivity (MR-DC) application scenario. The terminal device or network device can function in full duplex, flexible duplex, and cross division duplex modes.

[0046] The network device may have the function of network energy saving, self-organizing network (SON) / minimization of drive test (MDT). The terminal may have the function of power saving.

[0047] Embodiments of the present disclosure may be implemented in test equipment, such as, for example, a signal generator, a signal analyzer, a spectrum analyzer, a network analyzer, a test terminal equipment, a test network equipment, a channel emulator, and the like.

[0048] Embodiments of the present disclosure may be performed in accordance with any generation of communication protocols now known or developed in the future, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or sixth generation (6G) networks.

[0049] In one embodiment, the terminal device may be connected to a first network device and a second network device. One of the first network device and the second network device may be a master node, and the other may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs). In one embodiment, the first network device may be a first RAT device, and the second network device may be a second RAT device. In one embodiment, the first RAT device is an eNB, and the second RAT device is a gNB. Information related to the different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In one embodiment, the first information may be transmitted from the first network device to the terminal device, and the second information may be transmitted from the second network device directly to the terminal device or via the first network device. In one embodiment, information related to the configuration of the terminal device set by the second network device may be transmitted from the second network device via the first network device. Information related to the reconfiguration of the terminal device set by the second network device may be transmitted from the second network device directly to the terminal device or via the first network device.

[0050] As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. The term "comprises" and variations thereof are interpreted as open ended terms meaning "including, but not limited to." The term "based on" is interpreted as "based at least in part on." The terms "one embodiment" and "embodiment" are interpreted as "at least one embodiment." The term "another embodiment" is interpreted as "at least one other embodiment." Terms such as "first," "second," and the like may refer to different objects or the same object. The following content may include other definitions, both explicit and implicit.

[0051] In some instances, values, processes or devices are referred to as "optimum," "lowest," "highest," "minimum," "maximum," etc. It is understood that such descriptions are intended to indicate choices among multiple functional alternatives that may be used, and that such choices are not necessarily better, smaller, higher, or more preferred than other choices.

[0052] As mentioned above, there are still some open issues to be discussed so that NCB-based PUSCH STxMP can be better supported, such as the configuration of SRS resources or SRS resource sets, reporting of terminal device capabilities, indication of SRS resource indicator (SRI), etc., need to be further developed for NCB-based PUSCH STxMP.

[0053] In view of this, the embodiments of the present disclosure provide a communication solution for STxMP to overcome the above or other potential problems. In one aspect, two SRS resource sets are applied together for STxMP, and two SRS resource indicators are provided in a single DCI. In another aspect, one dedicated SRS resource set is applied for STxMP, and one SRS resource indicator is provided in a single DCI. In yet another aspect, a default panel associated with BWP is proposed. In this way, PUSCH STxMP can be better supported.

[0054] The principles and implementations of the present disclosure are described in detail below with reference to the drawings.

[0055] In this disclosure, some terms may refer to the same or similar physical meaning and may be used interchangeably. Some examples are given below: The terms “port used for uplink transmission”, “port used for PUSCH transmission”, “port with non-zero PUSCH transmit power” and “port with non-zero uplink transmit power” can be used interchangeably. The terms “panel used for uplink transmission”, “panel used for PUSCH transmission”, “panel with non-zero PUSCH transmit power” and “panel with non-zero uplink transmit power” can be used interchangeably. The terms “transmission capability information”, “UE capability information”, “capability related information”, “capability value set”, “panel information” and “panel related information” may be used interchangeably. The terms “precoder”, “precoding”, “precoding matrix”, “beam”, “spatial relationship information”, “spatial relationship info”, “precoding information”, “precoding information and number of layers”, “Precoding Matrix Indicator (PMI)”, “Precoding Matrix Indicator”, “Transmit Precoding Matrix Indication”, “Precoding Matrix Indication”, “TCI State”, “Transmit Configuration Indicator”, “Quasi Collocation (QCL)”, “Quasi Collocation”, “QCL ​​Parameters”, “QCL ​​Assumptions”, “QCL ​​Relationships” and “Spatial Relationships” can be used interchangeably. The terms "single TRP", "single TCI state", "single TCI", "S-TCI", "single CORESET", "single control resource set pool", "S-TRP" and "S-TCI state" can be used interchangeably. The terms "multiple TRPs", "multiple TCI states", "multiple CORESETs" and "multiple controlled resource set pools", "multiple TRPs", "multiple TCI states", "multiple TCIs", "multiple CORESETs" and "multiple controlled resource set pools", "MTRPs" and "M-TCIs", "M-TPRs" can be used interchangeably. The terms "resource", "resource within a resource set", and "resource set" can be used interchangeably. · The terms "group", "subset" and "set" may be used interchangeably. Furthermore, a panel as discussed herein refers to one or more antenna elements arranged in a particular area of ​​a terminal device. A panel as discussed herein may refer to a downlink panel, an uplink panel, a panel type, a panel state, a capability set, a reference signal (RS) resource, an RS resource set, an antenna port, an antenna port group, a beam, or a beam group. In this regard, the terms "panel", "panel type", "set of antenna ports", "antenna element", and "antenna array" (and equivalent expressions) may be used interchangeably. Additionally, panel information discussed herein may refer to UE panel index / identification (ID), downlink panel ID, uplink panel ID, panel type indication, panel state indication, capability set index, RS resource ID, RS resource set ID, antenna port ID, antenna port group ID, beam ID, beam group ID. As used herein, the term "TRP" refers to an antenna array (having one or more antenna elements) available to a network device in a particular geographic location. Although some embodiments of the present disclosure are described with reference to, for example, a multiple TRP scenario (or a single TRP scenario), these embodiments are merely for illustrative purposes to aid those skilled in the art in understanding and practicing the present disclosure and are not intended to imply any limitation on the scope of the present disclosure. It should be understood that the present disclosure described herein can be implemented in a variety of ways other than those described below. As used herein, the term "SRS transmission" refers to a transmission of an SRS resource identified by an SRS signal resource indicator (SRI) in a DCI message for an uplink grant. Thus, the term "latest SRS transmission" refers to the most recent transmission of an SRS resource identified by an SRI in a DCI message for an uplink grant. As used herein, the term "network" / "network device" refers to one or more network devices. Thus, the terms "network," "network device," and "one or more network devices" may be used interchangeably. "Less capable panel" can be used interchangeably with "more capable panel", "panel corresponding to index of set of less / more capable values", "most recently used panel", "[old] panel used in first access / minimum PRACH", etc. In other words, this can be any predefined rule that both NW and UE know, or NW / UE can signal each other by configuration / capability report / request. - 'BWP ID / index' can be used interchangeably with 'BWP / CC ID / index', 'CC identity / index', 'Cell identity / index', 'Physical cell identity / index' and 'Serving cell identity / index'. Example of communication environment

[0056] 1A illustrates an exemplary communication network 100A in which embodiments of the present disclosure may be implemented. Communication network 100A includes network device 110-1 and, optionally, network device 110-2 (collectively or individually referred to as network device 110). Network device 110 may provide services to end device 120. For purposes of discussion, network device 110-1 may be referred to as first network device 110-1 and network device 110-2 may be referred to as second network device 110-2. Furthermore, first network device 110-1 and second network device 110-1 may communicate with each other.

[0057] In the communication network 100A, a link from the network device 110 (such as the first network device 110-1 or the second network device 110-2) to the terminal device 120 is called a downlink, while a link from the terminal device 120 to the network device 110 (such as the first network device 110-1 or the second network device 110-2) is called an uplink. In the downlink, the first network device 110-1 or the second network device 120-1 is a transmitting (Tx) device (or transmitter) and the terminal device 120 is a receiving (Rx) device (or receiver). In the uplink, the terminal device 120 is a transmitting (Tx) device (or transmitter) and the first network device 110-1 or the second network device 110-2 is an Rx device (or receiver).

[0058] In some embodiments, network device 110 and end device 120 may communicate over a direct link / channel.

[0059] Furthermore, multiple panels may be arranged in the terminal device 120. As shown in Fig. 1A, panels 125-1 and 125-2 are arranged in the terminal device 120. Hereinafter, the panels 125-1 and 125-2 may be referred to as a first panel 125-1 and a second panel 125-2, respectively.

[0060] In some embodiments, the first panel 125-1 and the second panel 125-2 correspond to different sets of antenna ports / antenna elements / antenna arrays. In one specific example, the first panel 125-1 corresponds to a first set of antenna ports and the second panel 125-2 corresponds to a second set of antenna ports. In some embodiments, the panels 125-1, 125-2 may each correspond to a different set of capability values.

[0061] The communication network 100A supports the NCB-based PUSCH STxMP. Specifically, the terminal device 120 may execute the NCB-based PUSCH simultaneously on both the panels 125-1 and 125-2.

[0062] Additionally, in the embodiment of Figure 1A, multi-TRP transmission is also supported. As shown in Figure 1A, the terminal device 120 may communicate with two TRPs, namely TRPs 130-1 and 130-2 (collectively or individually referred to as TRPs 130). For purposes of discussion, TRPs 130-1 and 130-2 are referred to as first and second TRPs 130-2, respectively.

[0063] Further, to support multiple TRPs and / or multiple panels, the network device 110 may include one or more TRPs. For example, the network device 110 may be connected to multiple TRPs in different geographic locations to achieve better coverage. In one specific exemplary embodiment, the first network device 110-1 includes a first TRP 130-1 and a second TRP 130-2. Alternatively, in another specific exemplary embodiment, the first network device 110-1 and the second network device 110-2 include a first TRP 130-1 and a second TRP 130-2, respectively.

[0064] In some embodiments, the first TRP 130-1 and the second TRP 130-2 are associated with different control resource set pools (CORESET pools), e.g., the first TRP 130-1 is associated with a first control resource set pool, while the second TRP 130-2 is associated with a second control resource set pool.

[0065] Further, in the example of Fig. 1A, both single-TRP mode transmission and multi-TRP transmission are supported. Specifically, in the case of single-TRP mode, the terminal device 120 communicates with the network via the first TRP 130-1 / second TRP 130-2. Alternatively, in the case of multi-TRP mode, the terminal device 120 communicates with the network via both the first TRP 130-1 and the second TRP 130-2.

[0066] As a specific exemplary embodiment, during an NCB-based PUSCH STxMP, the terminal device 120 communicates with a first TRP 130-1 via panel 125-1 and simultaneously communicates with a second TRP 130-2 via panel 125-2.

[0067] Furthermore, the network device 110 may provide one or more serving cells, and the first TRP 130-1 and the second TRP 130-2 may be included in the same serving cell or in different serving cells. In other words, in the embodiment of FIG. 1A, both inter-cell and intra-cell transmissions are supported.

[0068] Figure 1B illustrates an example scenario of the communication network 100A shown in Figure 1A. In the example of Figure 1B, the first TRP 130-1 and the second TRP 130-2 are included in the same serving cell 140. In this case, the multi-TRP transmission is performed as an intra-cell transmission.

[0069] Figure 1C illustrates another exemplary scenario of the communication network 100A shown in Figure 1A. In the specific example of Figure 1C, the first TRP 130-1 and the second TRP 130-2 are included in different serving cells 140-1, 140-2. In this case, the multi-TRP transmission is performed as an inter-cell transmission.

[0070] The communication of the communication network device 100A may conform to any suitable standard, including, but not limited to, Long Term Evolution (LTE), LTE Evolution (LTE-Evolution), LTE Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), and Global System for Mobile Communications (GSM). Furthermore, the communication may be performed according to any currently known or future developed generation of communication protocols. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G), 5.5G, 5G-Advanced network, or sixth generation (6G) communication protocols.

[0071] It should be understood that the number, connections, and types of elements (i.e., terminal devices 120, panels 125, network devices 110, TRPs 130, and cells 140) shown in Figures 1A-1C are for illustrative purposes only and do not imply any limitations. Communications network 100A may include any suitable number of elements suitable for implementing embodiments of the present disclosure.

[0072] 2A illustrates a signaling flow 200A for scheduling NCB-based PUSCH transmissions in which an embodiment of the present disclosure can be implemented. As shown in FIG. 2A, the terminal device 120 may pass 210 UE capability information to the network device 110.

[0073] An example of a UE capability is a coherence type supported by the terminal device 120, which may be one of fullCoherent, partialCoherent, and nonCoherent. In a specific exemplary embodiment, the coherence type may be reported using an information element (IE) pusch-TransCoherence. Figure 2B illustrates an example 200B of coherence types. Furthermore, only a subset of precoders may be used for a particular coherence type.

[0074] Another example of a UE capability is a full power mode supported by the terminal device, which may be one of full power mode 0 (fullpower or ul-FullPwrMode), full power mode 1 (ul-FullPwrMode1 or fullpowerMode1), and full power mode 2 (ul-FullPwrMode2 or fullpowerMode2). FIG. 2C illustrates an example full power mode 200C. Specifically, for full power mode 0, the terminal device can provide a maximum output power of 23 dBm since the transmit power is divided equally between the non-zero PUSCH antennas. For full power mode 1, the terminal device 110 may transmit with a total maximum output power of 23 dBm on the PUSCH using precoder {1,1}, which means that the maximum output power cannot be provided with precoders {1,0} and {0,1}. In the case of full power mode 2, terminal device 110 may transmit on the PUSCH using precoder {1,1} with a total maximum output power of 23 dBm through the procedure of precoder reporting and antenna virtualization.

[0075] Additionally, the full power modes may be reported in information elements (IEs) including, but not limited to, ul-FullPwrMode-r16, ul-FullPwrMode2-MaxSRS-ResInSet-r16, ul-FullPwrMode1-r16, etc. Additionally, only a subset of precoders may be used for a particular full power capability.

[0076] Other UE capabilities may be the maximum number of UL layers supported by terminal device 120 and the maximum number of SRS ports supported by terminal device 120.

[0077] 2A, the network device 110 may send a radio resource control (RRC) (re)configuration message to configure the NCB-based PUSCH (220). For example, the information configured by the RRC (re)configuration message may include an SRS configuration and a PUSCH configuration.

[0078] Network device 110 may send 230 the CSI-RS for the SRS transmission or an indication of the UL beam for the SRS transmission to terminal device 120. The terminal device may calculate 240 an UL precoder based on measurements of the CSI-RS or based on the indicated UL beam.

[0079] The terminal device 120 may then transmit the precoded SRS based on the calculated UL precoder to the network device 110 (250). In response, the network device may perform channel measurements by measuring the SRS (260). In this manner, the network device can determine the PUSCH layer and the precoder.

[0080] After the above procedure, the network device 110 may transmit an UL grant (e.g., a PUSCH configuration in DCI format 0_1, 0_2, or a parameter for PUSCH transmission in a configuration grant) to schedule an NCB-based PUSCH transmission (270). The terminal device 120 may perform an NCB-based PUSCH transmission to the network device 110 based on the received UL grant (280).

[0081] 3A illustrates an example 300A of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented. In this example, the transmission mode is coherent joint transmission (CJT) with multiple activated panel / antenna port sets. As shown in FIG. 3A, all antenna ports may be used jointly, regardless of whether they are included in the first panel 125-1 or the second panel 125-2.

[0082] FIG. 3B illustrates an example 300B of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented. In this example, the transmission mode is noncoherent joint transmission (NCJT) with multiple activated panels / antenna port sets. As shown in FIG. 3B, the first panel 125-1 and the second panel 125-2 are noncoherent, while the antenna ports in the same panel are coherent. In the specific example of FIG. 3B, both one codeword (CW) transmission or two CW transmissions are supported. In some embodiments, CW-to-layer mapping allows two CW transmissions to be transmitted in more than four layers, while two CWs can be supported by transmitting one TB per panel / TRP, and each of the two CWs can be mapped to layers #1 to #4. In the specific example of FIG. 3B, one codeword (CW), i.e., one TB, is divided into four layers (layers #1 to #4).

[0083] In some embodiments, different layers may be transmitted simultaneously by different panels. Specifically, layers (0, ..., v1-1) are transmitted by the first panel 125-1, and layers (v1, ..., v-1) are transmitted by the second panel 125-2, where v1 is the number of layers transmitted through the first panel 125-1, and v is the total number of layers of the CW through both the first and second panels 125. As shown in FIG. 3B, layers #1 and #2 are transmitted through the first panel 125-1, and layers #3 and #4 are transmitted through the second panel 125-2.

[0084] In some embodiments, different precoding matrices (i.e., precoders) may be used by different panels. Specifically, a first precoding matrix is ​​used by the first panel 125-1, and a second precoding matrix is ​​used by the second panel 125-2. As shown in FIG. 4B, precoding matrix #1 / precoder #1 is used by the first panel 125-1, and precoding matrix #2 / precoder #2 is used by the second panel 125-2.

[0085] In some embodiments, different beamforming is used by different panels. As a result, a first beam may be formed by the first panel 125-1 and shown to the first TRP 130-1, and a second beam may be formed by the second panel 125-2 and shown to the second TRP 130-2. In this way, the first and second TRPs 130 can jointly process uplink transmissions of received PUSCHs (such as NCB-based PUSCH STxMP).

[0086] It should be understood that as a general rule, non-coherent joint transmission may be performed for different TRPs between different panels / ports / beams / layers.

[0087] 3C shows an example 300C of a transmission mode of STxMP in which an embodiment of the present disclosure can be implemented. In this example, the transmission mode is PUSCH with spatial division multiplexing (SDM) repetition (referred to as SDM repetition for brevity) of the same transport block (TB) per panel / antenna port set or for different TRPs. As shown in FIG. 3C, the first panel 125-1 and the second panel 125-2 are non-coherent, while the antenna ports in the same panel are coherent.

[0088] In some embodiments, the same TB is transmitted to different TRPs at the same time through different panels. Specifically, the same number of layers is assumed for different panels. Specifically, layers (0,...,v) are transmitted by the first panel 125-1 and the second panel 125-2, where v is the total number of layers of the CW through both the first panel 125 and the second panel 125.

[0089] In some embodiments, different precoding matrices (i.e., precoders) may be used by different panels. Specifically, a first precoding matrix is ​​used by the first panel 125-1, and a second precoding matrix is ​​used by the second panel 125-2. As shown in FIG. 3C, precoding matrix #1 / precoder #1 is used by the first panel 125-1, and precoding matrix #2 / precoder #2 is used by the second panel 125-2.

[0090] In some embodiments, different beamforming is used by different panels. As a result, a first beam may be formed by the first panel 125-1 and shown to the first TRP 130-1, and a second beam may be formed by the second panel 125-2 and shown to the second TRP 130-2. In this way, the first and second TRPs 130 can process the received PUSCH uplink transmissions (such as NCB-based PUSCH STxMP) jointly (by soft combining) or separately.

[0091] In some embodiments, the communication network 100A may support a hybrid beamforming type associated with a digital precoding scheme and an analog beamforming scheme. In some embodiments, the digital precoding scheme may be one of joint precoding across panels or multiple TRPs, or individual precoding per panel or per TRP (e.g., different layers / TBs per panel / TRP). In some embodiments, the analog beamforming scheme may be one of full connection or subarray connection. In the case of the full connection scheme, one antenna port is connected to all antenna elements. For example, the same beam is formed by multiple panels / towards different TRPs. In the case of the subarray connection scheme, one antenna port is connected to a subset of antenna elements. For example, different beams are formed by one panel / towards different TRPs.

[0092] In some embodiments, the first coherence type indicates a panel-level coherence capability, the second coherence type indicates a port-level coherence capability within the panel, the first full power mode indicates a panel-level full power capability, or the second full power mode indicates a port-level full power capability within the panel.

[0093] In some embodiments, the first full power mode is one of a first panel level full power mode, a second panel level full power mode, or a third panel level full power mode. The first panel-level full power mode indicates that full power is achieved regardless of the number of panels used for uplink transmission, i.e. panel-level full power mode is supported and the terminal device 120 can provide full power even if a subset of panels is used for transmission, which can be seen as a per-UE power constraint. The second panel-level full power mode indicates that full power supply is valid when all panels of the terminal device 120 are used for uplink transmission, i.e., panel-level full power mode 1 is supported and the terminal device 120 can transmit at full power only when all panels are used for transmission. The third panel-level full power mode indicates that full power is valid if all panels of the terminal device 120 are used for uplink transmission or at least one specific precoder or precoder combination is configured, i.e., panel-level full power mode 2 is supported and the terminal device 120 can transmit at full power only if all panels are used for transmission or the terminal device 120 can transmit at full power only if the reported precoder / precoder combination is indicated.

[0094] Furthermore, in some embodiments, when the first full power mode is a third panel level full power mode, the transmit capability information further includes information regarding at least one particular precoder or combination of precoders.

[0095] Further, the coherence type (including the first coherence type and the second coherence type) and the full power mode (including the first full power mode and the second full power mode) depend on one or both of the supported STxMP modes (i.e., transmission modes) and UE hybrid beamforming types (i.e., hybrid beamforming types). Specifically, in some embodiments, the first coherence type, the second coherence type, the first full power mode, and the second full power mode are associated with the transmission modes. Alternatively, or in addition, in some other embodiments, the first coherence type, the second coherence type, the first full power mode, and the second full power mode are associated with a hybrid beamforming type associated with a digital precoding scheme and an analog beamforming scheme. Such associations are discussed with reference to FIGS. 4A-4D.

[0096] FIG. 4A shows an example 400A of an antenna structure corresponding to a hybrid beamforming type. In this example, a combination of joint precoding and full connection is supported. In the specific example of FIG. 4A, the coherent type is fully coherent, and both the first full power mode and the second full power mode can be full power mode 0, full power mode 1, or full power mode 2. Such an antenna structure is particularly suitable for uplink CJT (such as coherent STxMP PUSCH transmission).

[0097] FIG. 4B illustrates an example 400B of an antenna structure corresponding to a hybrid beamforming type. In this example, a combination of separate precoding and subarray (i.e., separate digital precoding and subarray-connected analog beamforming) is supported. In the specific example of FIG. 4B, the transmission mode is NCJT (e.g., non-coherent STxMP PUSCH transmission), and the coherent type is partially coherent (i.e., fully coherent within the first panel / second panel and non-coherent between the first panel 130-1 and the second panel 130-2). Furthermore, in the specific example of FIG. 4B, the first full power mode is full power mode 1 or 2 (i.e., full power mode 1 or 2 in the first panel 130-1 and the second panel 130-2), and the second full power mode is full power mode 0 (i.e., full power mode 0 in the first panel / second panel). Such an antenna structure is particularly suitable for uplink NCJT or uplink simultaneous SDM repetition where the same TB is replaced by a subset of layers.

[0098] FIG. 4C shows an example 400C of an antenna structure corresponding to a hybrid beamforming type. In this example, a combination of joint precoding and subarray (i.e., joint precoding and subarray-connected analog beamforming) is supported. In the specific example of FIG. 4C, the coherence type is partially coherent (i.e., fully coherent within the first panel / second panel and non-coherent between the first panel 130-1 and the second panel 130-2). Furthermore, in the specific example of FIG. 4C, the first full power mode is full power mode 1 or 2 (i.e., full power mode 1 or 2 in the first panel 130-1 and the second panel 130-2), and the second full power mode is full power mode 0 (i.e., full power mode 0 in the first panel / second panel). Such an antenna structure is particularly suitable for uplink simultaneous SDM repetition.

[0099] FIG. 4D shows an example 400D of an antenna structure corresponding to a hybrid beamforming type. In this example, a combination of separate precoding and full connection (i.e., separate precoding and full connection analog beamforming) is supported. In the specific example of FIG. 4D, the coherent type is fully coherent, and both the first and second can be full power mode 0, full power mode 1, or full power mode 2.

[0100] To better support NCB-based PUSCH STxMP, some open issues remain regarding configuration of SRS resource or SRS resource set for NCB-based PUSCH STxMP, reporting of UE capability for NCB-based PUSCH STxMP, SRI indication for NCB-based PUSCH STxMP, etc. Embodiments of the present disclosure provide communication solutions for STxMP to overcome these and other potential problems, which are described below with reference to Figures 5-7.

[0101] 5-7 show schematic diagrams illustrating a communication process according to some exemplary embodiments of the present disclosure. For purposes of discussion, the process will be described with reference to FIGS. 1A-1C.

[0102] Each of the processes may involve the terminal device 120, the network device 110 (either or both of the first network device 110-1 and the second network device 110-2), and may optionally involve the TRP 130 (including the first TRP 130-1 and the second TRP 130-2). In other words, the implementation of some embodiments does not depend on the TRP 130. The terminal device 120 may be provided with a first panel 125-1 and a second panel 125-2. Further, the first panel 125-1 corresponds to a first set of antenna ports, and the second panel 125-2 corresponds to a second set of antenna ports.

[0103] Furthermore, the first TRP 130-1 is connected to the first network device 110-1, while the second TRP 130-2 is connected to the first network device 110-1 / second network device 110-2. In addition, the first TRP 130-1 and the second TRP may be in the same serving cell or in different serving cells.

[0104] Although several embodiments of the present disclosure are described below with reference to two TRPs and two panels, these embodiments are merely for illustrative purposes and to assist those skilled in the art in understanding and practicing the present disclosure, and are not intended to imply any limitation on the scope of the present disclosure. It should be understood that the present disclosure described herein can be embodied in various ways other than those described below.

[0105] Further, it should be understood that the operations at the terminal device 120 and the network device 110 should be consistent. In other words, the network device 110 and the terminal device 120 should have a common understanding of settings, parameters, etc. Such a common understanding may be implemented by any suitable interaction between the network device 110 and the terminal device 120, or by both the network device 110 and the terminal device 120 applying the same rules / policies. In the following, some operations are described from the perspective of the terminal device 120, but it should be understood that the corresponding operations should be performed by the network device 110. Similarly, some operations are described from the perspective of the network device 110, but it should be understood that the corresponding operations should be performed by the terminal device 120. For the sake of brevity, some identical or similar content is omitted herein.

[0106] Furthermore, in the following description, several interactions are performed between terminal device 120 and network device 110 (e.g., exchange of capability related information, configuration / scheduling / activation of resources / transmissions, etc.). It should be understood that the interactions may be implemented in either one single signaling / message or multiple signaling / messages, including system information, radio resource control (RRC) messages, DCI, uplink control information (UCI), medium access control (MAC) control element (CE), etc. The present disclosure is not limited in this respect.

[0107] In some embodiments, one or more interactions may be specific to a particular panel, TRP, capability score, control resource set (CORESET), etc. In this manner, the PUSCH STxMP can be flexibly configured / activated.

[0108] Furthermore, although features / operations may be discussed individually in specific exemplary embodiments, it will be understood that, unless expressly stated to the contrary, these features / operations described in different exemplary embodiments may be used in any suitable combination. An exemplary implementation of STxMP with two SRS resource sets

[0109] In this embodiment, two SRS resource sets are jointly applied to STxMP, and two SRS resource indicators are provided in a single DCI.

[0110] 5 shows a schematic diagram illustrating a communication process 500, according to some exemplary embodiments of the present disclosure. For purposes of discussion, the process 500 will be described with reference to FIGS. 1A-1C. 1. SRS settings

[0111] As shown in FIG. 5, the network device 110 may send an SRS configuration indicating a first set of SRS resources and a second set of SRS resources to the terminal device 120 (510). In response, the terminal device 120 may receive the SRS configuration. For example, the first and second sets of SRS resources may be configured with a parameter "usage" set to "noncodebook". Assume that one port of SRS resources is configured for the first and second sets of SRS resources. It should be understood that the number of the first and second sets of SRS resources is not limited to 1, and any other suitable number is possible.

[0112] In some embodiments, the SRS resources in the first and second sets of SRS resources can be used for simultaneous transmission. In some exemplary embodiments, SRS resources in the same set may be transmitted simultaneously. For example, SRS resources in the same set may only be transmitted via the same UL beam. As another example, the number of SRS resources in the same set may be less than or equal to the number indicated in the UE capabilities corresponding to the set. The number indicated in the UE capabilities may include per-panel or single-panel values ​​reported by the UE for at least one of the following capabilities: maxNumberSRS-Ports, maxNumberMIMO-LayersNonCB-PUSCH, maxNumberSimultaneousSRS-ResourceTx, maxNumberSRS-ResourcePerSet. It should be understood that other suitable forms for the capabilities are also possible.

[0113] In some exemplary embodiments, the SRS resources in different sets may be transmitted simultaneously. For example, the SRS resources in different sets may be transmitted via different UL beams. As another example, the total number of SRS resources in both the first and second sets may be less than or equal to the number indicated in the UE capabilities corresponding to the first and second sets. The number indicated in the UE capabilities may include the total or STxMP values ​​reported by the UE for at least one of the capabilities maxNumberSRS-Ports, maxNumberMIMO-LayersNonCB-PUSCH, maxNumberSimultaneousSRS-ResourceTx, maxNumberSRS-ResourcePerSet. It should be understood that other suitable forms for the capabilities are also possible.

[0114] In some embodiments, the first and second sets of SRS resources are configured with the same time domain configuration, i.e., both the first and second sets are configured with the same time domain operation, in this manner, the SRS configuration can be used to configure all SRS resources to transmit with the same symbols.

[0115] For example, both the first set and the second set may be configured as "periodic." As another example, both the first set and the second set may be configured as "semi-persistent." As yet another example, both the first set and the second set may be configured as "non-periodic."

[0116] In some embodiments where both the first and second sets may be set to aperiodic, both the first and second sets may be set to the same trigger value or entry in the aperiodic SRS trigger list. For example, the value of the aperiodicSRS-ResourceTrigger or entry in the AperiodicSRS-ResourceTriggerList of each SRS-ResourceSet is the same. In some embodiments where both the first and second sets may be set to "periodic" or "semi-persistent", both the first and second sets may be set to the same periodicity and / or offset.

[0117] In some embodiments, the first and second sets of SRS resources are configured with the same UL beam configuration. In other words, the first and second sets are configured with the same UL beam configuration. In this way, the SRS configuration can be used to set all SRS resources to be transmitted with the same symbol. In other words, the first and second sets may be configured with the same value of the parameter "useIndicatedTCIState". In some exemplary embodiments, the indicated TCI state may include at least two UL beam information, and the mapping relationship between the UL beam and the SRS resource set may be set to one-to-one, sequential order, cyclic order, etc. In some exemplary embodiments, when the parameter "associated CSI-RS" is configured, the parameter "useIndicatedTCIState" may not be configured or may not be set as "yes". In some exemplary embodiments, when the "associated CSI-RS" is configured, the UE may obtain the UL beam and / or the UL precoder by measuring the associated CSI-RS. 2. SRI in DCI

[0118] Continuing to refer to FIG. 5, the network device 110 transmits (520) a DCI for scheduling UL transmission to the terminal device 120. The DCI includes a first SRI and a second SRI. The first SRI indicates the number of layers (for convenience, also referred to herein as a first number of layers) transmitted on the first panel 125-1. The second SRI indicates the number of layers (for convenience, also referred to herein as a second number of layers) transmitted on the second panel 125-2. The number of layers corresponds to the number of SRI values ​​indicated by the first SRI or the second SRI. The SRI value indicates an index of the SRS resource (i.e., the i-th SRS resource).

[0119] In some embodiments, the first SRI and the second SRI may be carried in a single DCI or in multiple DCIs. In some embodiments where multiple DCIs are used, each of the multiple DCIs may include both the first SRI and the second SRI. In some embodiments where multiple DCIs are used, some of the multiple DCIs may include the first SRI and some other of the multiple DCIs may include the second SRI.

[0120] In some alternative embodiments, the first SRI and the second SRI may be carried in a configuration grant. 1) The first SRI associated with the first panel

[0121]

number

[0122] In some alternative embodiments, the network device 110 may determine the bit width B1 of the first SRI based on the maximum number of layers supported for UL transmission, the third number of layers associated with the second SRI, and the number of SRS resources in the first set of SRS resources. In some embodiments, the network device 110 may determine the bit width B1 in this manner when the transmission mode of the STxMP is CJT or NCJT.

[0123] In some embodiments, the third number of layers may be equal to the second number of layers indicated by the second SRI. In some embodiments, the third number of layers may be equal to a predetermined value (also referred to herein as a first predetermined value for convenience). In some embodiments, the first predetermined value may be a minimum number of layers transmitted through the second panel 125-2. For example, the first predetermined value may be 1. It should be understood that the first predetermined value may be any other suitable value known to obtain a common understanding of the bit width B1 at both the network device 110 and the terminal device 120.

[0124]

number

[0125]

number

[0126]

number

[0127] In some embodiments, the first set of SRS resources may be configured with more SRS resources, a greater number of supported layers, a greater minimum number of layers and resources, a lower position in the added set list, or a lower SRS resource set ID than the second set of SRS resources. 2) A second SRI associated with the second panel

[0128] In some embodiments, the network device 110 may determine a bit width (denoted as B2 for convenience) of the second SRI based on the maximum number of layers supported for UL transmission, the fourth number of layers associated with the first SRI, and the number of SRS resources in the second set of SRS resources. In some embodiments, the network device 110 may determine the bit width B2 in this manner when the transmission mode of the STxMP is CJT or NCJT.

[0129] In some embodiments, the fourth number of layers may be equal to the first number of layers indicated by the first SRI. In some embodiments, the fourth number of layers may be equal to a predetermined value (also referred to herein as a second predetermined value for convenience). In some embodiments, the second predetermined value may be a minimum number of layers transmitted through the first panel 125-1. For example, the second predetermined value may be 1. It should be understood that the second predetermined value may be any other suitable value known to both the network device 110 and the terminal device 120 to have a common understanding of the bit width B2.

[0130]

number

[0131] In some alternative embodiments, the network device 110 may determine a bit width (denoted as B2 for convenience) of the second SRI based on the maximum number of layers supported for UL transmission, the fourth number of layers associated with the first SRI, the maximum number of layers supported for UL transmission in the second set of antenna ports (i.e., in the second panel 125-2), and the number of SRS resources in the second set of SRS resources. In some embodiments, the network device 110 may determine the bit width B2 in this manner when the transmission mode of the STxMP is CJT or NCJT.

[0132]

number

[0133] In some alternative embodiments, the network device 110 may determine a bit width (denoted as B2 for convenience) of the second SRI based on the maximum number of layers supported for UL transmission in the second set of antenna ports (i.e., in the second panel 125-2) and the number of SRS resources in the second set of SRS resources. In some embodiments, the network device 110 may determine the bit width B2 in this manner when the transmission mode of the STxMP is CJT or NCJT.

[0134]

number

[0135] In some embodiments where the first number of layers is equal to the second number of layers, the network device 110 may determine the bit width B2 of the second SRI based on the maximum number of layers supported for UL transmission and the number of SRS resources in the second set of SRS resources. In some embodiments, the network device 110 may determine the bit width B2 in this manner when the transmission mode of the STxMP is SDM repetition.

[0136]

number

[0137] Such a setting of the first SRI and the second SRI can reduce the number of bits used for the second SRI.

[0138]

number

[0139]

number

[0140]

number

[0141]

number

[0142] If the UE supports operation with maxMIMO-Layers and the higher layer parameter maxMIMO-Layers in the PUSCH-ServingCellConfig of the serving cell is configured, max is given by its parameters. Otherwise, L max is given by the maximum number of layers of PUSCH that the UE supports for a serving cell for non-codebook based operation. 3)STxMP PUSCH instruction

[0143] In some embodiments, the network device 110 may transmit an indication to the terminal device 120 that the UL transmission is at least one of a CJT transmission, an NCJT transmission, or an SDM repetition. In some embodiments, the indication may be carried in the RRC configuration, for example, by an STxMP enabler.

[0144] In some embodiments, the indication may be carried in the DCI. In this way, dynamic switching between the STxMP mode and other modes such as single panel PUSCH, single TRP PUSCH, or MTRP PUSCH repetition can be performed. Meanwhile, a specific code point for the STxMP mode may be configured.

[0145] In some embodiments, the indication may indicate different STxMP modes including CJT transmission, NCJT transmission, or SDM repetition, for example, with more RRC configuration enablers and / or more specific codepoints configured for each different mode.

[0146] In some embodiments where the indication may indicate multiple STxMP modes, the network device 110 may determine a bit width of a first SRI for each of the multiple STxMP modes and determine a maximum of the bit widths of the multiple STxMP modes as a final bit width of the first SRI. Similarly, the network device 110 may determine a bit width of a second SRI for each of the multiple STxMP modes and determine a maximum of the bit widths of the multiple STxMP modes as a final bit width of the second SRI. In this manner, the determination of the first and second SRIs can accommodate all possible STxMP modes. 3. Determine the port

[0147] Continuing to refer to FIG. 5, upon receiving the DCI, terminal device 120 determines a first set of indices of antenna ports (e.g., PUSCH ports) associated with first panel 125-1 (530). In some embodiments, terminal device 120 may determine a first SRI from the DCI based on a bit width B1 of the first SRI (531). Terminal device 120 may determine bit width B1 in a manner similar to that done by network device 110, and details thereof are omitted here for brevity. Based on the determined first SRI and the received SRS configuration, terminal device 120 determines a first set of antenna port indexes (532).

[0148] In some embodiments, terminal device 120 may determine a first set of antenna port indexes based on a first number of layers indicated by the first SRI and an index of an SRS resource in the first set of SRS resources. For example, in the case of STxMP PUSCH, terminal device 120 may transmit the PUSCH using the same antenna port as the SRS port of the SRS resource indicated by both SRS resource indicators. For example, the first set of antenna port indexes may be determined by the following equation (9): p i = 1000 + i (9) Here, p i represents the (i+1)th antenna port index in the first set of antenna port indexes, where i represents the index of the SRS resource in the first set of SRS resources, ranging from 1 to the first number of layers. It should be understood that equation (9) is only an example, and other suitable methods are possible.

[0149] Continuing to refer to FIG. 5, the terminal device 120 further determines (540) a second set of antenna port indexes associated with the second panel 125-2. In some embodiments, the terminal device 120 determines (540) a second set of antenna port indexes associated with the second panel 125-2 based on the bit width B2 of the second SRI. 、 Terminal device 120 may determine a second SRI from the DCI (541). Terminal device 120 may determine bit width B2 in a manner similar to that done by network device 110, and details thereof are omitted here for brevity. Based on the second SRI and the SRS configuration, terminal device 120 determines a second set of antenna port indexes (542).

[0150]

number

[0151]

number

[0152] In some embodiments, the PUSCH shares the same UL beam and / or precoder as the SRS resource corresponding to the indicated SRI.

[0153]

number

[0154] 5, when the first and second sets of antenna port indexes are determined, the terminal device 120 performs UL transmission (e.g., PUSCH transmission) on antenna ports (e.g., PUSCH ports) corresponding to the first and second sets of antenna port indexes in the first and second sets of antenna ports (550). Correspondingly, the network device 110 also determines the first set of antenna port indexes (560) and determines the second set of antenna port indexes (570) in a manner similar to that performed by the terminal device 120. Thereafter, the network device 110 can receive UL transmission on antenna ports corresponding to the first and second sets of antenna port indexes.

[0155] The process 500 can better support NCB-based PUSCH STxMP. Example implementation of STxMP with one SRS resource set

[0156] In this embodiment, one SRS resource set is applied to the STxMP, and one SRS resource indicator is provided in a single DCI.

[0157] 6 shows a schematic diagram illustrating a communication process 600, according to some exemplary embodiments of the present disclosure. For purposes of discussion, the process 600 will be described with reference to FIGS. 1A-1C. 1. SRS settings

[0158] As shown in FIG. 6, the network device 110 may send an SRS configuration indicating a first set of SRS resources and a second set of SRS resources to the terminal device 120 (610). In response, the terminal device 120 may receive the SRS configuration. For example, the first set of SRS resources may be configured with a parameter "usage" set to "noncodebook" for STxMP, and the second set of SRS resources may be configured for non-STxMP. Assume that one port of SRS resources is configured for the first set of SRS resources and the second set of SRS resources. It should be understood that the number of the first set of SRS resources and the second set of SRS resources is not limited to 1, and any other suitable number is possible.

[0159] In some embodiments, the SRS resources in the first set of SRS resources may be used for simultaneous transmission. For example, the SRS resources in the first set may be transmitted via different UL beams. For example, the maximum number of different UL beams associated with the first set may be two. It should be appreciated that any other suitable number is also possible.

[0160] As another example, the number of SRS resources in the same set may be less than or equal to the number indicated in the UE's capabilities corresponding to the set. The number indicated in the UE's capabilities may include the total or STxMP values ​​reported by the UE for at least one of the following capabilities: maxNumberSRS-Ports, maxNumberMIMO-LayersNonCB-PUSCH, maxNumberSimultaneousSRS-ResourceTx, maxNumberSRS-ResourcePerSet. It should be understood that other suitable forms for the capabilities are also possible.

[0161] In yet another example, the SRS resources in the first set may be divided into two subsets, one of which may correspond to a first panel and the other of which may correspond to a second panel.

[0162] In some embodiments, the first set of SRS resources and the second set of SRS resources cannot be used for simultaneous transmission, in other words, the first set of SRS resources and the second set of SRS resources cannot be transmitted simultaneously.

[0163] In some embodiments, the first set of SRS resources is configured with a parameter "useIndicatedTCIState". In some exemplary embodiments, the indicated TCI state may include at least two UL beam information, and the mapping relationship between the UL beam and the SRS resource set may be configured as one-to-one, sequential order, cyclic order, etc. In some exemplary embodiments, if the parameter "associated CSI-RS" is configured, the parameter "useIndicatedTCIState" may not be configured or may be configured as "yes". In some exemplary embodiments, if the "associated CSI-RS" is configured, the UE may obtain the UL beam and / or the UL precoder by measuring the associated CSI-RS. For example, the associated CSI-RS may be measured simultaneously via two UE panels. As another example, the associated CSI-RS may refer to two different CSI-RS resources transmitted simultaneously. 2. SRI in DCI

[0164] Continuing to refer to FIG. 6, the network device 110 transmits (620) a DCI for scheduling UL transmission to the terminal device 120. The DCI includes an SRI indicating the number of layers (for convenience, also referred to herein as a first number of layers) to be transmitted on each of the first panel 125-1 and the second panel 125-2. The number of layers corresponds to the number of SRI values ​​indicated by the SRI. The SRI value indicates an index of the SRS resource (i.e., the i-th SRS resource).

[0165] In some embodiments, the SRI may be carried in a single DCI or in multiple DCIs. In some embodiments where multiple DCIs are used, the multiple DCIs may include the same or different SRIs.

[0166] In some alternative embodiments, the SRI may be carried in the configuration grant.

[0167]

number

[0168]

number

[0169]

number

[0170]

number

[0171]

number

[0172] In some embodiments, the network device 110 may transmit an indication to the terminal device 120 that the UL transmission is at least one of a CJT transmission, an NCJT transmission, or an SDM repetition. In some embodiments, the indication may be carried in the RRC configuration, for example, by an STxMP enabler.

[0173] In some embodiments, the indication may be carried in the DCI. In this way, dynamic switching between the STxMP mode and other modes such as single panel PUSCH, single TRP PUSCH, or MTRP PUSCH repetition can be performed. Meanwhile, a specific code point for the STxMP mode may be configured.

[0174] In some embodiments, the indication may indicate different STxMP modes including CJT transmission, NCJT transmission, or SDM repetition, for example, with more RRC configuration enablers and / or more specific codepoints configured for each different mode.

[0175] In some embodiments where the indication may indicate multiple STxMP modes, the network device 110 may determine the bit width of the SRI for each of the multiple STxMP modes and determine the maximum bit width of the multiple STxMP modes as the final bit width of the SRI. In this way, the determination of the SRI can accommodate all possible STxMP modes.

[0176]

number

[0177]

number

[0178] If the UE supports operation with maxMIMO-Layers and the higher layer parameter maxMIMO-Layers in the PUSCH-ServingCellConfig of the serving cell is configured, max is given by its parameters. Otherwise, L max is given by the maximum number of layers of PUSCH that the UE supports for a serving cell for non-codebook based operation. 3. Determine the port

[0179] Continuing to refer to FIG. 6, upon receiving the DCI, the terminal device 120 determines (630) a set of antenna port indexes associated with the first panel 125-1 and the second panel 125-2. In some embodiments, the terminal device 120 determines (630) a set of antenna port indexes associated with the first panel 125-1 and the second panel 125-2 based on the bit width B3 of the SRI. 、 Terminal device 120 may determine an SRI from the DCI (631). Terminal device 120 may determine bit width B3 in a manner similar to that done by network device 110, and details thereof are omitted here for brevity. Based on the determined SRI and the received SRS configuration, terminal device 120 determines a set of antenna port indexes (632).

[0180]

number

[0181] For example, if SRS resources 0 and 1 are associated with the first panel and SRS resources 2 and 3 are associated with the second panel, the SRS ports of the second and third SRS resources are indexed as 1000 and 1001. If the first set includes four SRS resources, the corresponding SRS ports are indexed as 1000 and 1001. If the first SRS resource indicator indicates the SRI as "1,2" (for example, as in Tables 4 and 5), the corresponding PUSCH ports are 1000 and 1001. The terminal device transmits the same one-layer PUSCH on both panels simultaneously, in which case port 1001 is used with the first panel and port 1000 is used with the second panel.

[0182]

number

[0183]

number

[0184] 6, once the set of antenna port indexes is determined, the terminal device 120 performs UL transmission on a set of antenna ports corresponding to the set of antenna port indexes in the first and second sets of antenna ports (640). Correspondingly, the network device 110 also determines a set of antenna port indexes in a manner similar to that performed by the terminal device 120 (650). The network device 110 can then receive UL transmission on the set of antenna ports corresponding to the first and second sets of antenna port indexes.

[0185] The process 600 also allows for better support of NCB-based PUSCH STxMP. Example implementation of STxMP with default panel

[0186] In this embodiment, a default panel is defined for the STxMP. The default panel is associated with the BWP configured for the terminal device 120. The default panel may also be referred to as a default capability set. In other words, the default panel corresponds to a set of capability values, i.e., a default capability set.

[0187] 7 shows a schematic diagram illustrating a communication process 700, according to some exemplary embodiments of the present disclosure. For purposes of discussion, the process 700 will be described with reference to FIGS. 1A-1C.

[0188] 7, the terminal device 120 determines (710) a default set of capability values ​​associated with the BWP configured for the terminal device 120. In some embodiments, a panel with a lower capability may be determined as the default panel. In some alternative embodiments, a panel with a higher capability may be determined as the default panel. It should be appreciated that any other suitable method is also possible.

[0189] In some embodiments, a default BWP may be associated with a panel with lower capabilities. In other words, a BWP associated with a panel with lower capabilities is a default BWP. For example, a BWP with a particular ID may be considered a default BWP.

[0190] Additionally, default panel assumption means that the UE is not expected (or "the UE is not expected" or "the UE may not expect") to transmit beyond the UE's default panel capabilities, which applies at least to SRS / PUCCH / PUSCH transmission, UL BWP selection, and UL beam selection. For example, if a UE reports two capability values ​​or capability sets, a 2-port SRS in capability value or capability set 1 and a 4-port SRS in capability value or capability set 2, then initially, no more than 2-layer PUSCH transmissions are supported.

[0191] A "less capable panel" may refer to a lower capability value or set of capability values ​​that includes at least lower values ​​of maxNumberSRS-Ports, maxNumberMIMO-LayersNonCB-PUSCH, maxNumberSimultaneousSRS-ResourceTx, maxNumberSRS-ResourcePerSet. In cases where a single panel and STxMP are specified, the less capable panel may be associated with a single panel transmission.

[0192] 7, terminal device 120 performs UL transmission based on a default capability value set (720). In some embodiments, terminal device 120 performs initial transmission with network device 110 by applying a default capability value set (721).

[0193] In some embodiments, terminal device 120 determines whether a fallback condition is met (722). If a fallback condition is met, terminal device 120 may perform UL transmission by applying a default capability value set or by falling back to the default capability value set (723). Correspondingly, network device 110 may also determine a default capability value set configured for terminal device 120 (730) and receive UL transmission based on the default capability value set.

[0194] In some embodiments, scenarios requiring a fallback to a default capability set may include at least one of the following: An initial transmission during the period between reporting a capability set and transmitting a first communication report. During initial or random access During the period following reset, initial access, or random access During periods of link failure or poor link performance, e.g., when BLER / RSRP / SINR is below a threshold When scheduled by a specific DCI format, e.g. a fallback DCI format, more specifically DCI format 0_0 If you do not receive a confirmation message for a communication report after sending the communication report for a certain period of time If the default BWP / CC is activated If default TCI states, spatial relations, or QCL assumptions are applied

[0195] When using the default panel associated with the BWP, the BWP switching indication may be used to indicate switching between UE panels, thus avoiding mismatches in UE UL panel assumptions in special scenarios.

[0196] It should be appreciated that the default panel may be applied to any suitable UL transmission, e.g., NCB-based or CB-based PUSCH transmission, STxMP or non-STxMP, as this disclosure is not limited in this respect. Example implementation of UE capability reporting

[0197] The embodiments of the present disclosure also provide a solution for reporting UE capabilities, in which terminal device 120 may transmit or report to network device 110 at least one of a first set of terminal device 120 capability values ​​associated with a first set of antenna ports, a second set of terminal device 120 capability values ​​associated with a second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0198] In other words, terminal device 120 may report a per-panel value and a total value for a UE capability type, or may report a single panel and STxMP value for a UE capability type.

[0199] The UE capability types may include at least one of the following: supportedSRS-Resources Defines support for SRS resources. Capability signaling includes indication of: - maxNumberAperiodicSRS-PerBWP indicates the maximum supported number of aperiodic SRS resources that can be configured for a UE per BWP. - maxNumberAperiodicSRS-PerBWP-PerSlot indicates the maximum supported number of aperiodic SRS resources per slot within a BWP. - maxNumberPeriodicSRS-PerBWP indicates the maximum supported number of periodic SRS resources per BWP. - maxNumberPeriodicSRS-PerBWP-PerSlot indicates the maximum supported number of periodic SRS resources per slot within a BWP. - maxNumberSemiPersistentSRS-PerBWP indicates the maximum supported number of semi-persistent SRS resources that can be configured for a UE per BWP. - maxNumberSemiPersistentSRS-PerBWP-PerSlot indicates the maximum supported number of semi-persistent SRS resources per slot within a BWP. - maxNumberSRS-Ports-PerResource indicates the maximum supported number of SRS antenna ports per SRS resource. If this field is not included, the UE supports one periodic SRS resource, one aperiodic SRS resource per BWP, does not support semi-persistent SRS resources, supports one periodic SRS resource, one aperiodic SRS resource per slot and per BWP, does not support semi-persistent SRS resources, and supports one SRS antenna port per SRS resource. srs-AssocCSI-RS Parameters for the computation of the precoder for SRS transmission based on channel measurements using the associated NZP CSI-RS resource (srs-AssocCSI-RS). A UE that supports this feature must also indicate support for non-codebook based PUSCH transmission. This capability signaling includes the following list of parameters: - maxNumberTxPortsPerResource indicates the maximum number of Tx ports in the resource. - maxNumberResourceSTxMP indicates the maximum number of resources for simultaneous transmission between multiple UE panels. - maxNumberResourcesPerBand indicates the maximum number of resources that may exist simultaneously on all CCs in a band. - totalNumberTxPortsPerBand indicates the total number of Tx ports that exist simultaneously on all CCs in the band. · maxNumberMIMO-LayersNonCB-PUSCH Defines the maximum supported number of MIMO layers at a UE for PUSCH transmission with non-codebook precoding. This feature is not supported for SUL. A UE that supports non-codebook based PUSCH transmission shall also indicate support for maxNumberMIMO-LayersNonCB-PUSCH, maxNumberSRS-ResourcePerSet, and maxNumberSimultaneousSRS-ResourceTx. · maxNumberSimultaneousSRS-ResourceTx Defines for the UE the maximum number of SRS resources transmitted simultaneously in one symbol for non-codebook based transmission. This feature is not supported for SUL. · maxNumberSRS-ResourcePerSet Defines for a UE the maximum number of SRS resources per SRS resource set configured for codebook-based or non-codebook-based transmission. This feature is not supported for SUL. Exemplary implementation of relaxation of restrictions

[0200] To support UEs that can simultaneously use multiple panels with different panel capabilities, at least the following restrictions must be removed:

[0201] For example, if two SRS resource sets are configured in srs-ResourceSetToAddModList or srs-ResourceSetToAddModListDCI-0-2 and the upper layer parameter usage of SRS-ResourceSet is set to "nonCodebook", it is not expected that the UE will configure different numbers of SRS resources in the two SRS resource sets. If STxMP is supported, this restriction may be removed. In other words, if STxMP is supported, different numbers of SRS resources can be configured in the two SRS resource sets.

[0202] As another example, if configured, only one NZP CSI-RS resource may be configured in the UE for an SRS resource set with the higher layer parameter usage of SRS-ResourceSet set to "nonCodebook". If STxMP is supported, this restriction may be removed. In other words, if STxMP is supported, multiple NZP CSI-RS resources may be configured. Furthermore, multiple NZP CSI-RS resources may be transmitted simultaneously. Exemplary implementation of the method

[0203] In response to the above, embodiments of the present disclosure provide communication methods implemented in a terminal device and a network device, which are described below with reference to FIGS.

[0204] 8 illustrates an exemplary communication method 800 implemented in a terminal device according to some embodiments of the present disclosure. For example, method 800 may be performed in a terminal device 120 such as that illustrated in FIGS. 1A-1C. For purposes of discussion, method 800 will be described with reference to FIGS. 1A-1C. It should be understood that method 800 may include additional blocks not illustrated and / or omit some illustrated blocks, and that the scope of the disclosure is not limited in this respect.

[0205] At block 810, terminal device 120 receives DCI for scheduling an uplink transmission. The DCI includes a first SRS resource indicator and a second SRS resource indicator.

[0206] At block 820, terminal device 120 determines a first set of antenna port indexes based on a first number of layers of the uplink transmission and indexes of SRS resources within the first set of SRS resources, where the first number of layers is the number of layers transmitted on the first set of antenna ports and is indicated by a first SRS resource indicator.

[0207] At block 830, terminal device 120 determines a second set of antenna port indexes based on the indexes of the SRS resources in the second set of SRS resources, the second number of layers of the uplink transmission, and the number of SRS resources in the first set of SRS resources, where the second number of layers is the number of layers transmitted on the second set of antenna ports and is indicated by a second SRS resource indicator.

[0208] At block 840, terminal device 120 performs uplink transmission on antenna ports in the first and second sets of antenna ports that correspond to the first and second set of antenna port indexes.

[0209] In some embodiments, terminal device 120 may receive an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first and second sets of SRS resources may be used for simultaneous transmission, and the first and second sets of SRS resources are configured with the same time domain configuration and the same uplink beam configuration.

[0210] In some embodiments, terminal device 120 may determine the first SRS resource indicator from the DCI by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission, a third number of layers associated with the second SRS resource indicator, and the number of SRS resources in the first set of SRS resources, or by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission on the first set of antenna ports and the number of SRS resources in the first set of SRS resources. In some embodiments, the third number of layers is equal to the second number of layers or the first predetermined value.

[0211] In some embodiments, terminal device 120 may determine the second SRS resource indicator from the DIC by: determining a bit width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and the number of SRS resources in the second set of SRS resources; determining a bit width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, a maximum number of layers supported for uplink transmission on the second set of antenna ports, and the number of SRS resources in the second set of SRS resources; or determining a second bit width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission on the second set of antenna ports and the number of SRS resources in the second set of SRS resources. In some embodiments, the fourth number of layers is equal to the first number of layers or a second predetermined value.

[0212] In some embodiments, terminal device 120 may receive an indication indicating that the uplink transmission is a CJT transmission or an NCJT transmission.

[0213] In some embodiments, terminal device 120 may transmit at least one of a first set of terminal device capability values ​​associated with a first set of antenna ports, a second set of terminal device capability values ​​associated with a second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0214] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0215] 9 illustrates another exemplary communication method 900 implemented in a terminal device, according to some embodiments of the present disclosure. For example, the method 900 may be performed in a terminal device 120 such as that illustrated in FIGS. 1A-1C. For purposes of discussion, the method 900 will be described with reference to FIGS. 1A-1C. It should be understood that the method 900 may include additional blocks not illustrated and / or omit some of the blocks illustrated, and that the scope of the disclosure is not limited in this respect.

[0216] At block 910, terminal device 120 receives DCI for scheduling uplink transmission. The DCI includes an SRS resource indicator.

[0217] In block 920, terminal device 120 determines a set of antenna port indexes based on the number of layers of the uplink transmission, the indexes of the SRS resources in the first set of SRS resources, and the number of SRS resources in the first set of SRS resources, where the number of layers is the number of layers transmitted on each of the first and second sets of antenna ports and is indicated by the SRS resource indicator.

[0218] At block 930, terminal device 120 performs uplink transmission on a set of antenna ports corresponding to the set of antenna port indices in the first and second set of antenna ports.

[0219] In some embodiments, terminal device 120 may receive an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first set of SRS resources can be used for simultaneous transmission, and the first and second sets of SRS resources cannot be used for simultaneous transmission.

[0220] In some embodiments, terminal device 120 may determine the SRS resource indicator from the DCI by determining a bit-width of the SRS resource indicator based on the maximum number of layers supported for uplink transmission and half the number of SRS resources in the first set of SRS resources.

[0221] In some embodiments, terminal device 120 may receive an indication that the uplink transmission is an SDM repetition.

[0222] In some embodiments, terminal device 120 may transmit at least one of a first set of terminal device capability values ​​associated with a first set of antenna ports, a second set of terminal device capability values ​​associated with a second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0223] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0224] 10 illustrates yet another exemplary communication method 1000 implemented in a terminal device, according to some embodiments of the present disclosure. For example, the method 1000 may be performed in a terminal device 120 as illustrated in FIGS. 1A-1C. For purposes of discussion, the method 1000 will be described with reference to FIGS. 1A-1C. It should be understood that the method 1000 may include additional blocks not illustrated and / or omit some of the blocks illustrated, and that the scope of the disclosure is not limited in this respect.

[0225] In block 1010, the terminal device 120 determines a default capability set associated with the BWP configured for the terminal device.

[0226] In block 1020, the terminal device 120 performs at least one of performing an initial transmission with the network device by applying a default capability value set, or performing an uplink transmission by applying a default capability value set in accordance with a determination that a fallback condition is satisfied.

[0227] 11 illustrates an exemplary communication method 1100 implemented in a network device according to some embodiments of the present disclosure. For example, method 1100 may be performed in a network device 110 (network device 110-1 or 110-2) as illustrated in FIGS. 1A-1C. For purposes of discussion, method 1100 will be described with reference to FIGS. 1A-1C. It should be understood that method 1100 may include additional blocks not illustrated and / or omit some illustrated blocks, and that the scope of the disclosure is not limited in this respect.

[0228] At block 1110, the network device 110 transmits DCI for scheduling an uplink transmission. The DCI includes a first SRS resource indicator and a second SRS resource indicator.

[0229] At block 1120, the network device 110 determines a first set of antenna port indexes based on a first number of layers of the uplink transmission and indexes of SRS resources within the first set of SRS resources, where the first number of layers is the number of layers transmitted on the first set of antenna ports and is indicated by the first SRS resource indicator.

[0230] At block 1130, the network device 110 determines a second set of antenna port indexes based on the indexes of the SRS resources in the second set of SRS resources, the second number of layers of the uplink transmission, and the number of SRS resources in the first set of SRS resources, where the second number of layers is the number of layers transmitted on the second set of antenna ports and is indicated by a second SRS resource indicator.

[0231] At block 1140, the network device 110 performs uplink transmission on antenna ports in the first and second set of antenna ports that correspond to the first and second set of antenna port indexes.

[0232] In some embodiments, the network device 110 may transmit an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first set of SRS resources and the second set of SRS resources can be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources are configured with the same time domain configuration and the same uplink beam configuration.

[0233] In some embodiments, the network device 110 may determine the first SRS resource indicator by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission, a third number of layers associated with the second SRS resource indicator, and the number of SRS resources in the first set of SRS resources, or by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission on the first set of antenna ports and the number of SRS resources in the first set of SRS resources. In some embodiments, the third number of layers is equal to the second number of layers or the first predetermined value.

[0234] In some embodiments, the network device 110 may determine the second SRS resource indicator by: determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and the number of SRS resources in the second set of SRS resources; determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, a maximum number of layers supported for uplink transmission on the second set of antenna ports, and the number of SRS resources in the second set of SRS resources; or determining a second bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission on the second set of antenna ports and the number of SRS resources in the second set of SRS resources. In some embodiments, the fourth number of layers is equal to the first number of layers or a second predetermined value.

[0235] In some embodiments, the network device 110 may transmit an indication that the uplink transmission is a CJT transmission or an NCJT transmission.

[0236] In some embodiments, network device 110 may receive at least one of a first set of terminal device capability values ​​associated with a first set of antenna ports, a second set of terminal device capability values ​​associated with a second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0237] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0238] 12 illustrates another exemplary communication method 1200 implemented in a network device according to some embodiments of the present disclosure. For example, method 1200 may be performed in a network device 110 (network device 110-1 or 110-2) as illustrated in FIGS. 1A-1C. For purposes of discussion, method 1200 will be described with reference to FIGS. 1A-1C. It should be understood that method 1200 may include additional blocks not illustrated and / or omit some illustrated blocks, and the scope of the present disclosure is not limited in this respect.

[0239] At block 1210, the network device 110 transmits DCI for scheduling an uplink transmission. The DCI includes an SRS resource indicator.

[0240] At block 1220, the network device 110 determines a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in the first set of SRS resources, and a number of SRS resources in the first set of SRS resources, where the number of layers is the number of layers transmitted on each of the first and second sets of antenna ports and is indicated by an SRS resource indicator.

[0241] At block 1230, the network device 110 performs uplink transmission on a set of antenna ports corresponding to the set of antenna port indexes in the first and second set of antenna ports.

[0242] In some embodiments, the network device 110 may transmit an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first set of SRS resources may be used for simultaneous transmission, and the first and second sets of SRS resources may not be used for simultaneous transmission.

[0243] In some embodiments, the network device 110 may determine the SRS resource indicator from the DCI by determining a bit width of the SRS resource indicator based on the maximum number of layers supported for uplink transmission and half the number of SRS resources in the first set of SRS resources.

[0244] In some embodiments, the network device 110 may transmit an indication that the uplink transmission is an SDM repetition.

[0245] In some embodiments, network device 110 may receive at least one of a first set of terminal device capability values ​​associated with a first set of antenna ports, a second set of terminal device capability values ​​associated with a second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0246] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0247] 13 illustrates yet another exemplary communication method 1300 implemented in a network device, according to some embodiments of the present disclosure. For example, the method 1300 may be performed in a network device 110 (network device 110-1 or 110-2) as illustrated in FIGS. 1A-1C. For purposes of discussion, the method 1300 will be described with reference to FIGS. 1A-1C. It should be understood that the method 1300 may include additional blocks not illustrated and / or omit some illustrated blocks, and the scope of the disclosure is not limited in this respect.

[0248] In block 1310, the network device 110 determines a default capability set for the terminal device 120 associated with the BWP established for the terminal device.

[0249] In block 1320, the network device 110 performs at least one of performing an initial transmission with the terminal device 120 by applying a default capability value set, or performing an uplink transmission by applying a default capability value set in accordance with a determination that a fallback condition is satisfied.

[0250] 14 is a schematic block diagram of an apparatus 1400 suitable for implementing an embodiment of the present disclosure. The apparatus 1400 can be considered as a further exemplary implementation of the terminal device 120 and the network devices 110-1 and 110-2 shown in FIGS. 1A-1C. Thus, the apparatus 1400 can be implemented in, or at least as part of, the terminal device 120 and the network devices 110-1 and 110-2.

[0251] As shown, the apparatus 1400 includes a processor 1410, a memory 1420 coupled to the processor 1410, a suitable transmitter (TX) and receiver (RX) 1440 coupled to the processor 1410, and a communication interface coupled to the TX / RX 1440. The memory 1410 stores at least a portion of a program 1430. The TX / RX 1440 is for bidirectional communication. The TX / RX 1440 has at least one antenna to facilitate communication, although in practice the access nodes discussed herein may have multiple antennas. The communication interface may represent any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between eNBs, an S1 interface for communication between a Mobility Management Entity (MME) / Serving Gateway (S-GW) and an eNB, an Un interface for communication between an eNB and a Relay Node (RN), or an Uu interface for communication between an eNB and a terminal device.

[0252] The program 1430 may be considered to include program instructions that, when executed by an associated processor 1410, enable the device 1400 to operate in accordance with embodiments of the present disclosure, as discussed herein with reference to FIGS. 1A-13. The embodiments of the present disclosure may be implemented by computer software, hardware, or a combination of software and hardware executable by the processor 1410 of the device 1400. The processor 1410 may be configured to implement various embodiments of the present disclosure. The combination of the processor 1410 and the memory 1420 may also constitute a processing means 1450 suitable for implementing various embodiments of the present disclosure.

[0253] The memory 1420 may be of any type suitable for the local technology network and may be implemented by any suitable data storage technology, including, but not limited to, computer-readable non-transitory storage media, semiconductor-based storage devices, magnetic storage devices and systems, optical storage devices and systems, fixed and removable memories, etc. Although only one memory 1420 is shown in the device 1400, multiple physically distinct memory modules may be installed in the device 1400. The processor 1410 may be of any type suitable for the local technology network and may include, but is not limited to, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), and processors based on multi-core processor configurations. The device 1400 may have multiple processors, for example application specific integrated circuit chips time-slaved to a clock synchronous with a master processor.

[0254] In some embodiments, a terminal device in which a first set and a second set of antenna ports are configured includes a circuit configured to receive a DCI for scheduling an uplink transmission, determine a first set of antenna port indexes based on a first number of layers of the uplink transmission and indexes of SRS resources in the first set of SRS resources, determine a second set of antenna port indexes based on indexes of SRS resources in the second set of SRS resources, a second number of layers of the uplink transmission and number of SRS resources in the first set of SRS resources, and perform the uplink transmission on antenna ports in the first and second set of antenna ports corresponding to the first and second set of antenna port indexes. The DCI includes a first SRS resource indicator and a second SRS resource indicator. The first number of layers is a number of layers transmitted on the first set of antenna ports and is indicated by the first SRS resource indicator. The second number of layers is a number of layers transmitted on the second set of antenna ports and is indicated by the second SRS resource indicator.

[0255] In some embodiments, the circuitry may be further configured to receive an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first set of SRS resources and the second set of SRS resources may be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources are configured with the same time domain configuration and the same uplink beam configuration.

[0256] In some embodiments, the circuitry may be further configured to determine the first SRS resource indicator from the DCI by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission, a third number of layers associated with the second SRS resource indicator, and the number of SRS resources in the first set of SRS resources, or by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission on the first set of antenna ports and the number of SRS resources in the first set of SRS resources. In some embodiments, the third number of layers is equal to the second number of layers or the first predetermined value.

[0257] In some embodiments, the circuitry may be further configured to determine the second SRS resource indicator from the DIC by: determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and the number of SRS resources in the second set of SRS resources; determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, a maximum number of layers supported for uplink transmission on the second set of antenna ports, and the number of SRS resources in the second set of SRS resources; or determining a second bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission on the second set of antenna ports and the number of SRS resources in the second set of SRS resources. In some embodiments, the fourth number of layers is equal to the first number of layers or the second predetermined value.

[0258] In some embodiments, the circuitry may be further configured to receive an indication indicating that the uplink transmission is a CJT transmission or an NCJT transmission.

[0259] In some embodiments, the circuitry may be further configured to transmit at least one of a first set of terminal device capability values ​​associated with the first set of antenna ports, a second set of terminal device capability values ​​associated with the second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0260] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0261] In some embodiments, a terminal device in which the first and second sets of antenna ports are configured includes circuitry configured to receive a DCI for scheduling an uplink transmission, determine a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in the first set of SRS resources, and a number of SRS resources in the first set of SRS resources, and perform the uplink transmission on a set of antenna ports in the first and second set of antenna ports that correspond to the set of antenna port indexes. The DCI includes an SRS resource indicator. The number of layers is the number of layers to be transmitted on each of the first and second sets of antenna ports and is indicated by the SRS resource indicator.

[0262] In some embodiments, the circuitry may be further configured to receive an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where SRS resources in the first set of SRS resources may be used for simultaneous transmissions and the first and second sets of SRS resources may not be used for simultaneous transmissions.

[0263] In some embodiments, the circuitry may be further configured to determine the SRS resource indicator from the DCI by determining a bit-width of the SRS resource indicator based on a maximum number of layers supported for uplink transmission and half the number of SRS resources in the first set of SRS resources.

[0264] In some embodiments, the circuitry may be further configured to receive an indication indicating that the uplink transmission is an SDM repetition.

[0265] In some embodiments, the circuitry may be further configured to transmit at least one of a first set of terminal device capability values ​​associated with the first set of antenna ports, a second set of terminal device capability values ​​associated with the second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0266] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0267] In some embodiments, a terminal device in which the first and second sets of antenna ports are configured includes circuitry configured to perform at least one of: determining a default capability value set associated with a BWP configured for the terminal device and performing an initial transmission with the network device by applying the default capability value set; or, pursuant to a determination that a fallback condition is satisfied, performing an uplink transmission by applying the default capability value set.

[0268] In some embodiments, the network device includes circuitry configured to: transmit a DCI for scheduling uplink transmissions to a terminal device in which the first and second sets of antenna ports are configured; determine a first set of antenna port indexes based on a first number of layers of the uplink transmission and indexes of SRS resources in the first set of SRS resources; determine a second set of antenna port indexes based on indexes of SRS resources in the second set of SRS resources, a second number of layers of the uplink transmission and number of SRS resources in the first set of SRS resources; and perform uplink transmissions on antenna ports in the first and second set of antenna ports corresponding to the first and second set of antenna port indexes. The DCI includes a first SRS resource indicator and a second SRS resource indicator. The first number of layers is a number of layers transmitted on the first set of antenna ports and is indicated by the first SRS resource indicator. The second number of layers is a number of layers transmitted on the second set of antenna ports and is indicated by the second SRS resource indicator.

[0269] In some embodiments, the circuitry may be further configured to transmit an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where the SRS resources in the first set of SRS resources and the second set of SRS resources may be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources are configured with the same time domain configuration and the same uplink beam configuration.

[0270] In some embodiments, the circuitry may be further configured to determine the first SRS resource indicator by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission, a third number of layers associated with the second SRS resource indicator, and the number of SRS resources in the first set of SRS resources, or by determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for uplink transmission on the first set of antenna ports and the number of SRS resources in the first set of SRS resources. In some embodiments, the third number of layers is equal to the second number of layers or the first predetermined value.

[0271] In some embodiments, the circuitry may be further configured to determine the second SRS resource indicator by: determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and the number of SRS resources in the second set of SRS resources; determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission, a fourth number of layers associated with the first SRS resource indicator, a maximum number of layers supported for uplink transmission on the second set of antenna ports, and the number of SRS resources in the second set of SRS resources; or determining a second bit-width of the second SRS resource indicator based on a maximum number of layers supported for uplink transmission on the second set of antenna ports and the number of SRS resources in the second set of SRS resources. In some embodiments, the fourth number of layers is equal to the first number of layers or the second predetermined value.

[0272] In some embodiments, the circuitry may be further configured to transmit an indication indicating that the uplink transmission is a CJT transmission or an NCJT transmission.

[0273] In some embodiments, the network device includes circuitry configured to: send a DCI for scheduling an uplink transmission to a terminal device in which the first and second sets of antenna ports are configured; determine a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in the first set of SRS resources, and a number of SRS resources in the first set of SRS resources; and perform the uplink transmission on a set of antenna ports in the first and second set of antenna ports that corresponds to the set of antenna port indexes. The DCI includes an SRS resource indicator. The number of layers is the number of layers to be transmitted on each of the first and second sets of antenna ports and is indicated by the SRS resource indicator.

[0274] In some embodiments, the circuitry may be further configured to transmit an SRS configuration indicating a first set of SRS resources and a second set of SRS resources, where SRS resources in the first set of SRS resources may be used for simultaneous transmission, and the first and second sets of SRS resources may not be used for simultaneous transmission.

[0275] In some embodiments, the circuitry may be further configured to determine the SRS resource indicator by determining a bit-width of the SRS resource indicator based on a maximum number of layers supported for uplink transmission and half the number of SRS resources in the first set of SRS resources.

[0276] In some embodiments, the circuitry may be further configured to transmit an indication indicating that the uplink transmission is an SDM repetition.

[0277] In some embodiments, the circuitry may be further configured to receive at least one of a first set of terminal device capability values ​​associated with the first set of antenna ports, a second set of terminal device capability values ​​associated with the second set of antenna ports, or a third set of terminal device capability values ​​associated with the first and second sets of antenna ports.

[0278] In some embodiments, the first set of antenna ports corresponds to a first panel, the second set of antenna ports corresponds to a second panel, and the uplink transmission is an NCB-based PUSCH and is performed over multiple TRPs.

[0279] In some embodiments, the network device includes circuitry configured to perform at least one of: determining a default capability value set for the terminal device associated with a BWP configured for the terminal device, and performing an initial transmission with the terminal device by applying the default capability value set, or performing an uplink transmission by applying the default capability value set pursuant to a determination that a fallback condition is satisfied.

[0280] As used herein, the term "circuitry" may refer to hardware circuits and / or combinations of hardware circuits and software. For example, a circuit may be a combination of analog and / or digital hardware circuits and software / firmware. As a further example, a circuit may be any portion of a hardware processor with software, such as a digital signal processor, software, and memory that work together to perform various functions on a device, such as a terminal device or a network device. In yet another example, a circuit may be a hardware circuit and / or processor, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when not required for operation. As used herein, the term circuitry also encompasses merely a hardware circuit or processor, or a portion of a hardware circuit or processor, and its (or their) accompanying software and / or firmware implementations.

[0281] In general, various embodiments of the present disclosure may be implemented by hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented by hardware, and other aspects may be implemented by firmware or software that may be executed by a controller, microprocessor, or other computing device. Various aspects of the embodiments of the present disclosure have been shown and described as block diagrams, flow charts, or illustrated by some other pictorial representation, and it will be understood that the blocks, apparatus, systems, techniques, or methods described herein may be implemented by, for example, but not limited to, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing device, or combinations thereof.

[0282] The present disclosure further provides at least one computer program product tangibly stored in a computer readable non-transitory storage medium. The computer program product includes computer executable instructions, such as instructions included in program modules. The instructions execute on a target real or virtual processor device to perform, for example, the processes or methods described above with reference to Figures 1A-13. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split among program modules as appropriate. The machine readable instructions of the program modules may be executed in local or distributed devices. In distributed devices, the program modules may be located in both local and remote storage media.

[0283] The program codes for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, a special purpose computer or other programmable data processing apparatus, and when the program codes are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are performed. The program codes may run entirely on the machine, partially on the machine, as a separate software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0284] The above program code may be embodied on a machine-readable medium, which may be any tangible medium that contains or stores a program used by or in conjunction with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0285] It should be understood that although operations have been described in a particular order, it is not required that such operations be performed in the particular order or sequence shown, or that all of the operations shown be performed, in order to achieve desired results. In some situations, multitasking and parallel processing may be advantageous. Similarly, although the above discussion includes some specific implementation details, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to certain embodiments. Some features that are described in the context of individual embodiments may be implemented in combination in an embodiment. Conversely, various features that are described in the context of an embodiment may be implemented in multiple embodiments, either individually or in any suitable subcombination.

[0286] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure, as defined by the appended claims, is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. 1. A communication method comprising: receiving, in a terminal device in which a first set of antenna ports and a second set of antenna ports are configured, downlink control information (DCI) for scheduling uplink transmissions; the DCI includes a first sounding reference signal (SRS) resource indicator and a second SRS resource indicator; The communication method includes: determining a first set of antenna port indexes based on a first number of layers of the uplink transmission and an index of an SRS resource within a first set of SRS resources; determining a second set of antenna port indexes based on indices of SRS resources in a second set of SRS resources, a second number of layers of the uplink transmission, and a number of SRS resources in the first set of SRS resources; performing the uplink transmission on antenna ports corresponding to the first set of antenna port indexes and the second set of antenna port indexes in the first set of antenna ports and the second set of antenna ports; Including, the first number of layers is a number of layers transmitted on the first set of antenna ports and is indicated by the first SRS resource indicator; the second number of layers is a number of layers transmitted on the second set of antenna ports and is indicated by the second SRS resource indicator. Communication methods.

2. receiving an SRS configuration indicating the first set of SRS resources and the second set of SRS resources; The SRS resources in the first set of SRS resources and the second set of SRS resources can be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources are configured with the same time domain configuration and the same uplink beam configuration. The method of claim 1.

3. determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a third number of layers associated with the second SRS resource indicator, and a number of SRS resources in the first set of SRS resources; or determining a bit width of the first SRS resource indicator based on a maximum number of layers supported for the uplink transmission on the first set of antenna ports and a number of SRS resources in the first set of SRS resources. determining the first SRS resource indicator from the DCI by The method of claim 1.

4. the third number of layers is equal to the second number of layers or a first predetermined value; The method according to claim 3.

5. determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and a number of SRS resources in the second set of SRS resources; determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a fourth number of the layers associated with the first SRS resource indicator, a maximum number of layers supported for the uplink transmission on the second set of antenna ports, and a number of SRS resources in the second set of SRS resources; or determining a second bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission on the second set of antenna ports and a number of SRS resources in the second set of SRS resources. determining the second SRS resource indicator from the DCI by The method of claim 1.

6. the fourth number of layers is equal to the first number of layers or a second predetermined value; The method according to claim 5.

7. receiving an indication indicating that the uplink transmission is a coherent joint transmission (CJT) transmission or a non-coherent joint transmission (NCJT) transmission. The method of claim 1.

8. 1. A communication method comprising: receiving, in a terminal device in which a first set of antenna ports and a second set of antenna ports are configured, downlink control information (DCI) for scheduling uplink transmissions; The DCI includes a sounding reference signal (SRS) resource indicator; The communication method includes: determining a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in a first set of SRS resources, and a number of SRS resources in the first set of SRS resources; performing the uplink transmission on a set of antenna ports in the first set of antenna ports and the second set of antenna ports corresponding to the set of antenna port indexes; Including, the number of layers being a number of layers transmitted on each of the first set of antenna ports and the second set of antenna ports, and being indicated by the SRS resource indicator. Communication methods.

9. receiving an SRS configuration indicating the first set of SRS resources and a second set of SRS resources; SRS resources in the first set of SRS resources may be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources may not be used for simultaneous transmission. The method according to claim 8.

10. determining the SRS resource indicator from the DCI by determining a bit-width of the SRS resource indicator based on a maximum number of layers supported for the uplink transmission and half a number of SRS resources in the first set of SRS resources. The method according to claim 8.

11. receiving an indication indicating that the uplink transmission is a repetition of spatial division multiplexing (SDM). The method according to claim 8.

12. a first set of capability values ​​of the terminal device associated with the first set of antenna ports; a second set of capability values ​​of the terminal device associated with the second set of antenna ports; or a third set of capability values ​​of the terminal device associated with the first set of antenna ports and the second set of antenna ports; and transmitting at least one of: The method according to claim 1 or 8.

13. the first set of antenna ports corresponds to a first panel, and the second set of antenna ports corresponds to a second panel; the uplink transmission is a non-codebook-based (NCB-based) physical uplink shared channel transmission (PUSCH) and is performed via multiple transmission / reception points (TRPs); The method according to claim 1 or 8.

14. determining, at a terminal device, a default set of capability values ​​associated with a bandwidth portion (BWP) configured for said terminal device; performing an initial transmission with a network device by applying said default capability value set; or performing an uplink transmission by applying the default capability value set in accordance with a determination that a fallback condition is satisfied; and performing at least one of Including, Communication methods.

15. 1. A communication method comprising: In the network device, transmitting downlink control information (DCI) for scheduling uplink transmission to a terminal device in which a first set of antenna ports and a second set of antenna ports are configured; the DCI includes a first sounding reference signal (SRS) resource indicator and a second SRS resource indicator; The communication method includes: determining a first set of antenna port indexes based on a first number of layers of the uplink transmission and an index of an SRS resource within a first set of SRS resources; determining a second set of antenna port indexes based on indices of SRS resources in a second set of SRS resources, a second number of layers of the uplink transmission, and a number of SRS resources in the first set of SRS resources; performing the uplink transmission on antenna ports corresponding to the first set of antenna port indexes and the second set of antenna port indexes in the first set of antenna ports and the second set of antenna ports; Including, the first number of layers is a number of layers transmitted on the first set of antenna ports and is indicated by the first SRS resource indicator; the second number of layers is a number of layers transmitted on the second set of antenna ports and is indicated by the second SRS resource indicator. Communication methods.

16. transmitting an SRS configuration indicating the first set of SRS resources and the second set of SRS resources; The SRS resources in the first set of SRS resources and the second set of SRS resources can be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources are configured with the same time domain configuration and the same uplink beam configuration. The method of claim 15.

17. determining a bit-width of the first SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a third number of layers associated with the second SRS resource indicator, and a number of SRS resources in the first set of SRS resources; or determining a bit width of the first SRS resource indicator based on a maximum number of layers supported for the uplink transmission on the first set of antenna ports and a number of SRS resources in the first set of SRS resources. determining the first SRS resource indicator by The method of claim 15.

18. the third number of layers is equal to the second number of layers or a first predetermined value; 20. The method of claim 17.

19. determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a fourth number of layers associated with the first SRS resource indicator, and a number of SRS resources in the second set of SRS resources; determining a bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission, a fourth number of the layers associated with the first SRS resource indicator, a maximum number of layers supported for the uplink transmission on the second set of antenna ports, and a number of SRS resources in the second set of SRS resources; or determining a second bit-width of the second SRS resource indicator based on a maximum number of layers supported for the uplink transmission on the second set of antenna ports and a number of SRS resources in the second set of SRS resources. determining the second SRS resource indicator by The method of claim 15.

20. the fourth number of layers is equal to the first number of layers or a second predetermined value; 20. The method of claim 19.

21. and transmitting an indication indicating that the uplink transmission is a coherent joint transmission (CJT) transmission or a non-coherent joint transmission (NCJT) transmission. The method of claim 15.

22. 1. A communication method comprising: In the network device, transmitting downlink control information (DCI) for scheduling uplink transmission to a terminal device in which a first set of antenna ports and a second set of antenna ports are configured; The DCI includes a sounding reference signal (SRS) resource indicator; The communication method includes: determining a set of antenna port indexes based on a number of layers of the uplink transmission, an index of an SRS resource in a first set of SRS resources, and a number of SRS resources in the first set of SRS resources; performing the uplink transmission on a set of antenna ports in the first set of antenna ports and the second set of antenna ports corresponding to the set of antenna port indexes; Including, the number of layers being a number of layers transmitted on each of the first set of antenna ports and the second set of antenna ports, and being indicated by the SRS resource indicator. Communication methods.

23. transmitting an SRS configuration indicating the first set of SRS resources and a second set of SRS resources; SRS resources in the first set of SRS resources may be used for simultaneous transmission, and the first set of SRS resources and the second set of SRS resources may not be used for simultaneous transmission.

23. The method of claim 22.

24. determining a bit-width of the SRS resource indicator based on a maximum number of layers supported for the uplink transmission and half a number of SRS resources in the first set of SRS resources.

23. The method of claim 22.

25. and transmitting an indication that the uplink transmission is a repetition of spatial division multiplexing (SDM).

23. The method of claim 22.

26. a first set of capability values ​​of the terminal device associated with the first set of antenna ports; a second set of capability values ​​of the terminal device associated with the second set of antenna ports; or a third set of capability values ​​of the terminal device associated with the first set of antenna ports and the second set of antenna ports; and further comprising receiving at least one of:

23. The method of claim 15 or 22.

27. the first set of antenna ports corresponds to a first panel, and the second set of antenna ports corresponds to a second panel; the uplink transmission is a non-codebook-based (NCB-based) physical uplink shared channel transmission (PUSCH) and is performed via multiple transmission / reception points (TRPs); 23. The method of claim 15 or 22.

28. determining, in a network device, a set of terminal device default capability values ​​configured for the terminal device, the set of capability values ​​being associated with a bandwidth portion (BWP) configured for the terminal device; performing an initial transmission with the terminal device by applying said default capability value set; or performing an uplink transmission by applying the default capability value set in accordance with a determination that a fallback condition is satisfied; and performing at least one of Including, Communication methods.

29. A processor configured to cause a terminal device to execute the method according to any one of claims 1 to 7, any one of claims 8 to 13 or claim 14, Terminal device.

30. A processor configured to cause a network device to perform the method of any one of claims 15 to 21, any one of claims 22 to 27 or claim 28. Network device.

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