Terminal device, network device, and method

Abstract

Embodiments of the present disclosure relate to a communication method, apparatus, and computer-readable medium. In response to receiving an STxMP instruction, a terminal device in which a panel is deployed determines a first transmission power for UL transmission based on at least one power limit for the panel, and determines a second transmission power for RS transmission based on the at least one power limit, the first transmission power, and a ratio of power-related parameters of the UL transmission and the RS transmission, the ratio being determined based on the at least one power limit. Then, the terminal device performs the UL transmission with the first transmission power and the RS transmission with the second transmission power. In this way, UL PC for STxMP considering different power limit assumptions is realized.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to a method, apparatus, and computer-readable storage medium for communication for uplink (UL) power control (PC) for a multi-transmission reception point (MTRP).

Background Art

[0002] Currently, it has been proposed to define an extension of the integrated transmission configuration indicator (TCI) framework for the indication of multi-downlink (DL) and UL transmission configuration indicator (TCI) states focusing on the MTRP use case. It has also been proposed to study power control (PC) for UL single downlink control information (DCI) for MTRP operations assuming an extension of the integrated TCI framework. Furthermore, two power limitation assumptions for simultaneous transmission across multi-panels (STxMP) are discussed, namely, the per-panel power limitation for STxMP and the total per-user equipment (UE) power limitation on all UE panels used for STxMP. However, how to perform UL PC for these scenarios is still incomplete and needs further study.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Generally, exemplary embodiments of the present disclosure provide a method, apparatus, and computer storage medium for communication for UL PC for MTRP.

Means for Solving the Problems

[0004] In a first aspect, a communication method is provided. The method includes, at a terminal device, receiving a first setting for sounding reference signal (SRS) transmission and a second setting for physical uplink shared channel (PUSCH) transmission; determining, according to a determination that a first indication indicating an active TCI state and a second indication indicating power control information have been received, one of the first indication and the second indication for use in power control; and determining a first transmission power for the PUSCH transmission based on the first setting and the second setting and the one of the first indication and the second indication.

[0005] In a second aspect, a communication method is provided. The method includes, at a network device, transmitting a first setting for SRS transmission and a second setting for PUSCH transmission; transmitting a first indication indicating an active TCI state and a second indication indicating power control information; and receiving the PUSCH transmission transmitted at the first transmission power determined based on the first setting and the second setting and the one of the first indication and the second indication.

[0006] In a third aspect, a communication method is provided. The method includes receiving, at a terminal device in which a first panel and a second panel are deployed, an instruction for simultaneous transmission on the first panel and the second panel; determining a first transmission power for uplink transmission based on at least one power limitation for the first panel and the second panel; determining a second transmission power for reference signal transmission based on the at least one power limitation, the first transmission power, and a ratio of power-related parameters of the uplink transmission and the reference signal transmission, the ratio being determined based on the at least one power limitation; and performing the uplink transmission with the first transmission power and performing the reference signal transmission with the second transmission power.

[0007] In a fourth aspect, a communication device is provided. The device includes a processor configured to execute the method according to the first, second, or third aspect of the present disclosure.

[0008] In a fifth aspect, a computer-readable medium storing instructions is provided. When the instructions are executed on at least one processor, the at least one processor is caused to execute the method described in the first, second, or third aspect of the present disclosure.

[0009] It should be understood that the summary section of the invention is not intended to identify key or essential features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure should be readily understandable from the following description.

Brief Description of the Drawings

[0010] Some embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings, so as to further clarify the above-mentioned and other objects, features, and advantages of the present disclosure.

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[0025] In the figure, the same or similar reference numerals represent the same or similar elements.

DETAILED DESCRIPTION OF THE INVENTION

[0026] Here, the principles of the present disclosure will be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and are intended to assist those skilled in the art in understanding and implementing the present disclosure, without suggesting any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in various ways different from the methods described below.

[0027] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0028] As used herein, the term "terminal device" refers to any device having wireless or wired communication capabilities. Examples of terminal devices are user equipment (UE), personal computers, desktops, mobile phones, cellular phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, in-vehicle devices for vehicle-to-everything (V2X) communication where X means pedestrian, vehicle, or infrastructure / network, devices for Integrated Access and Backhaul (IAB), Small Data Transmission (SDT), mobility, multicast and broadcast services (MBS), positioning, dynamic / flexible duplexing in commercial networks, reduced capability (RedCap), satellite and unmanned aircraft system (UAS) including high altitude platform (HAP) in non-terrestrial network (NTN) such as satellite-mounted vehicles or aircraft-mounted vehicles, extended reality (XR) devices including different types of reality such as augmented reality (AR), mixed reality (MR), virtual reality (VR), unmanned aerial vehicles (UAV) which are aircraft without human pilots and are generally referred to as dronesa vehicle, a device on a high-speed train (HST), or an image acquisition device such as a digital camera, a sensor, a game device, a music storage and playback device, or an Internet device that enables wireless or wired Internet access and browsing, etc., but is not limited thereto. The "terminal device" can further have a multicast / broadcast function and support public safety, mission-critical, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, smart TV, wireless services, wireless software delivery, group communication, and IoT applications. Also, one or more subscriber identity modules (SIMs), known as multi-SIM, may be incorporated. The term "terminal device" can be used interchangeably with UE, mobile station, subscriber equipment, mobile terminal, user terminal, or wireless device.

[0029] The term "network device" refers to a device that can provide or host a cell or coverage with which a terminal device can communicate. Examples of network devices include, but are not limited to, Node B (NodeB or NB), Evolved NodeB (eNodeB or eNB), next-generation NodeB (gNB), transmission reception point (TRP), remote radio unit (RRU), radio head (RH), remote radio head (RRH), IAB node, femto node, pico node and other low-power nodes, reconfigurable intelligent surface (RIS), network control repeater, etc.

[0030] The terminal device or network device may have the ability of artificial intelligence (AI) or machine learning. Generally, it includes a trained model from a large number of data collected for a specific function and can be used to predict some information.

[0031] The terminal device or network device may operate on some frequency ranges such as FR1 (410 MHz to 7125 MHz), FR2 (24.25 GHz to 71 GHz), frequency bands greater than 100 GHz, and terahertz (THz). Furthermore, it can operate on licensed / unlicensed / shared spectrum. The terminal device may have two or more connections with the network device under a multi-radio dual connectivity (MR-DC) application scenario. The terminal device or network device can operate in full-duplex, flexible-duplex, cross-split duplex modes.

[0032] The network device may have the functions of network energy saving, self-organizing networks (SON) / minimization of drive tests (MDT). The terminal may have a power-saving function.

[0033] Embodiments of the present disclosure may be implemented in test equipment such as signal generators, signal analyzers, spectrum analyzers, network analyzers, test terminal devices, test network devices, channel emulators, etc.

[0034] Embodiments of the present disclosure may be implemented according to any generation of communication protocols that are currently known or will be developed in the future. Examples of communication protocols include, but are not limited to, the first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocol, 5.5G, 5G-Advanced network, or sixth generation (6G) network.

[0035] 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 regarding different RATs may be transmitted from at least one of the first network device or the second network device to the terminal 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 or via the first network device to the terminal device. In one embodiment, information regarding the settings of the terminal device set by the second network device may be transmitted from the second network device via the first network device. Information regarding the reconfiguration of the terminal device set by the second network device may be transmitted from the second network device directly or via the first network device to the terminal device.

[0036] As used herein, the singular forms "a", "an", and "the" include the plural forms as well, unless the context clearly dictates otherwise. The terms "comprising", "including", and variations thereof are to be construed as open-ended terms meaning "including, but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". Terms such as "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may be included hereinafter.

[0037] In some examples, a value, procedure, or apparatus is referred to as "optimal", "lowest", "highest", "minimum", "maximum", etc. Such descriptions are intended to indicate that a selection is possible from among a plurality of functional alternatives being used, and it will be understood that such a selection need not be better, smaller, higher, or more preferable than other selections.

[0038] As described above, how to execute UL PC within the integrated TCI framework for MTRP is still incomplete, and how to execute UL PC for STxMP considering different power limit assumptions is also still incomplete.

[0039] In view of this, embodiments of the present disclosure provide a communication solution for UL PC to overcome the above and other potential problems. In one solution, when a terminal device receives an indication indicating an active TCI state (e.g., a TCI field in DCI) and another indication indicating PC information (e.g., an SRS resource indicator (SRI) field in another DCI), the terminal device determines one of the first indication and the second indication for use in the PC. In this way, it is possible to achieve an appropriate UL power determination.

[0040] In another solution, in response to receiving an STxMP instruction, a terminal device in which a plurality of panels are deployed determines transmission power for uplink transmission (for convenience, also referred to as first transmission power in this specification) based on at least one power limit for the plurality of panels. Further, the terminal device determines a ratio of power-related parameters between the uplink transmission and the reference signal transmission based on the at least one power limit, and determines transmission power for the reference signal transmission (for convenience, also referred to as second transmission power in this specification) based on the ratio, the at least one power limit, and the transmission power for the uplink transmission. Then, the terminal device performs the uplink transmission with the first transmission power and performs the reference signal transmission with the second transmission power. In this way, it is possible to correctly determine the UL power and to achieve appropriate UL power control.

[0041] Hereinafter, with reference to the accompanying drawings, the principles and embodiments of the present disclosure will be described in detail.

[0042] In the present disclosure, some terms may refer to the same or similar physical meanings and may be used interchangeably. Some exemplary examples are given below. · The terms "port used for uplink transmission", "port used for PUSCH transmission", "port having non-zero PUSCH transmission power", and "port having non-zero uplink transmission power" may be used interchangeably. · The terms "panel used for uplink transmission", "panel used for PUSCH transmission", "panel having non-zero PUSCH transmission power", and "panel having non-zero uplink transmission power" may 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 "pre-coder", "pre-coding", "pre-coding matrix", "beam", "spatial relation information", "spatial relation info", "pre-coding information", "pre-coding information and number of layers", "pre-coding matrix indicator (PMI: precoding matrix indicator)", "pre-coding matrix indicator", "transmission pre-coding matrix indication", "pre-coding matrix indication", "TCI state", "transmission configuration indicator", "quasi co-location (QCL)", "quasi co-location", "QCL parameter", "QCL assumption", "QCL relation" and "spatial relation" may be used interchangeably. · The terms "single TRP", "single TCI state", "single TCI", "S-TCI", "single control resource set (CORESET: control resource set)", "single CORESET pool", "S-TRP" and "S-TCI state" may be used interchangeably. · The terms "multiple TRP", "multiple TCI states", "multiple CORESETs" and "multiple control resource set pools", "multi-TRP", "multi-TCI states", "multi-TCI", "multi-CORESET" and "multi-control resource set pools", "MTRP" and "M-TCI", "M-TPR" may be used interchangeably. · The terms "resource", "resource within a resource set", "resource set" may be used interchangeably. · The terms "group", "subset" and "set" may be used interchangeably. · Further, one panel as described in this specification refers to one or more antenna elements deployed in a certain area of a terminal device. The panel described in this specification may refer to a downlink panel, an uplink panel, a panel type, a panel status, a set of capability values, 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 (and their equivalent expressions) "panel", "panel type", "antenna port set", "antenna element", and "antenna array" may be used interchangeably. · Additionally, the panel information described in this specification may refer to a UE panel index / identification information (ID), a downlink panel ID, an uplink panel ID, a panel type indication, a panel status indication, a set of capability value indices, an RS resource ID, an RS resource set ID, an antenna port ID, an antenna port group ID, a beam ID, or a beam group ID. The term "per panel" may be used interchangeably with "per capability value index", "per set of capability value indices", "per RF chain", "per Tx RF chain", "per branch", "per Tx branch", etc. · As used in this specification, the term "TRP" means an antenna array (having one or more antenna elements) available by a network device located at a specific geographical location. Although some embodiments of the present disclosure have been described with reference to an example of a multi-TRP scenario (or a single-TRP scenario), these embodiments are for illustrative purposes only, to help those skilled in the art understand and implement the present disclosure, and do not imply any limitation regarding the scope of the present disclosure. It should be understood that the content of the present disclosure described in this specification can be implemented in various ways different from the methods described below. · As used herein, the term "SRS transmission" refers to the transmission of an SRS resource identified by an SRS signal resource indicator (SRI) within a DCI message for uplink grant. Therefore, the term "latest SRS transmission" refers to the latest transmission of an SRS resource identified by the SRI within a DCI message for uplink grant. · As used herein, the term "network" / "network device" refers to one or more network devices. Therefore, the terms "network", "network device" and "one or more network devices" may be used interchangeably. · "Panel with lower capabilities" may be used interchangeably with "panel with higher capabilities", "panel corresponding to a lower / higher capability value set index", "last used panel", "[old] panel used in initial access / minimum PRACH", etc. In other words, it can be any pre-defined rule known on both the NW side and the UE side, or signaled to each other by the NW / UE through configuration / capability reporting / request. · "BWP ID / index" may 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

[0043] Figure 1A shows an exemplary communication network 100A in which embodiments of the present disclosure can be implemented. The communication network 100A includes network devices 110-1 and, optionally, network device 110-2 (collectively or individually referred to as network device 110). The network device 110 may provide services to the terminal device 120. For the sake of explanation, network device 110-1 is referred to as the first network device 110-1, and network device 110-2 is referred to as the second network device 110-2. Further, the first network device 110-1 and the second network device 110-2 may communicate with each other.

[0044] In the communication network 100A, the link from the network device 110 (e.g., the first network device 110-1 or the second network device 110-2) to the terminal device 120 is referred to as the downlink, and the link from the terminal device 120 to the network device 110 (e.g., the first network device 110-1 or the second network device 110-2) is referred to as the 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).

[0045] In some embodiments, the network device 110 and the terminal device 120 may communicate using a direct link / channel.

[0046] In some embodiments, two or more panels may be deployed for the terminal device 120. As shown in Figure 1A, panels 125-1 and 125-2 are deployed for the terminal device 120. Hereinafter, panels 125-1 and 125-2 may be referred to as the first panel 125-1 and the second panel 125-2, respectively.

[0047] 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. As 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 and 125-2 may each correspond to different sets of capability values.

[0048] In communication network 100A, it is possible to support PUSCH STxMP. Specifically, the terminal device 120 may simultaneously perform PUSCH on both the panels 125-1 and 125-2.

[0049] In some embodiments, it is also possible to support MTRP transmission. As shown in FIG. 1A, the terminal device 120 may communicate with two TRPs, namely, TRP 130-1 and 130-2 (collectively or individually referred to as TRP 130). For the sake of explanation, TRP 130-1 is referred to as the first TRP 130-1, and TRP 130-2 is referred to as the second TRP 130-2.

[0050] Furthermore, in order to support MTRP and / or multi-panel, the network device 110 may be provided with one or more TRPs. For example, the network device 110 may be coupled to a plurality of TRPs at different geographical locations in order to achieve better coverage. In one particular exemplary embodiment, the first network device 110-1 includes the first TRP 130-1 and the second TRP 130-2. Alternatively, in another particular exemplary embodiment, the first network device 110-1 and the second network device 110-2 each include the first TRP 130-1 and the second TRP 130-2.

[0051] In some embodiments, the first TRP 130-1 and the second TRP 130-2 are associated with different control resource set pools (CORESET pools). For example, the first TRP 130-1 is associated with a first control resource set pool, and the second TRP 130-2 is associated with a second control resource set pool.

[0052] Furthermore, both single TRP mode transmission and MTRP transmission may be supported by the specific example of FIG. 1A. Specifically, in the case of single TRP mode, the terminal device 120 communicates with the network via the first TRP 130-1 / the second TRP 130-2. Alternatively, in the case of MTRP mode, the terminal device 120 communicates with the network via both the first TRP 130-1 and the second TRP 130-2.

[0053] As one specific exemplary embodiment, during PUSCH STxMP, the terminal device 120 simultaneously communicates with the first TRP 130-1 via panel 125-1 and communicates with the second TRP 130-2 via panel 125-2.

[0054] 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 different serving cells. In other words, both inter-cell transmission and intra-cell transmission are supported by the specific example of FIG. 1A.

[0055] FIG. 1B shows an exemplary scenario of the communication network 100A shown in FIG. 1A. In the specific example of FIG. 1B, the first TRP 130-1 and the second TRP 130-2 are included in the same serving cell 140. In this case, MTRP transmission is performed as intra-cell transmission.

[0056] FIG. 1C shows another exemplary scenario of the communication network 100A shown in FIG. 1A. In the specific example of FIG. 1C, the first TRP 130-1 and the second TRP 130-2 are included in different serving cells 140-1 and 140-2. In this case, the MTRP transmission is performed as an inter-cell transmission.

[0057] Communications in the communication network 100A may comply with any suitable standard including, but not limited to, Long Term Evolution (LTE), LTE Evolution, LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA (registered trademark)), Code Division Multiple Access (CDMA), and Global System for Mobile Communications (GSM). Further, the communications may be performed according to any generation of communication protocol known currently or developed in the future. Examples of communication protocols include, but are not limited to, the 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 protocol.

[0058] It should be understood that the number of elements (i.e., the terminal device 120, the panel 125, the network device 110, the TRP 130, and the cell 140) as shown in FIGS. 1A to 1C, and their connection relationships and types are used for illustrative purposes only and do not imply any limitation. The communication network 100A may comprise any suitable number of elements suitable for implementing the embodiments of the present disclosure.

[0059] As is well known, the integrated TCI state may provide a reference signal (RS) to determine the QCL relationship, Tx beam, Uplink-powerControl, and path loss reference signal (PL RS). The types of integrated TCI states may include DL and UL, either respectively or jointly. Alternatively, the types of integrated TCI states may include DLorJoint and UL. Uplink-powerControl may further provide power control parameter settings, for example, P0, alpha, and closedLoopIndex for each of PUSCH, PUCCH, and SRS.

[0060] In some embodiments, the terminal device 120 may receive DCI including a TCI field indicating a plurality of TCI states from the network device 110. The plurality of TCI states may be associated with respective CORESETs or CORESET groups or search space sets (i.e., respective TRPs). Each TCI state may provide UL power control parameter settings and PL RS. Alternatively, each TCI state may not provide UL power control parameter settings and PL RS. In this case, it is unclear how to select one TCI state from the plurality of TCI states, and it is also unclear how to determine the applicable power control parameter settings and / or PL RS when they are not provided.

[0061] In some scenarios, the terminal device 120 may receive, from the network device 110, settings for PUSCH transmission including a power control adjustment state for PUSCH transmission. In some scenarios, the terminal device 120 may receive, from the network device 110, settings for SRS transmission including a power control adjustment state for an SRS resource set. In some embodiments, the TCI state may be applied to the SRS resource. In some embodiments, the TCI state may not be applied to the SRS resource. In some embodiments, the RRC information element (IE) UseIndicatedTCIState may be provided for the SRS resource set. In some embodiments, the RRC IE UseIndicatedTCIState may not be provided for the SRS resource set. In some embodiments, the power control adjustment state for the SRS resource set may be the same as the power control adjustment state for PUSCH transmission. In some embodiments, the power control adjustment state for the SRS resource set may be different from the power control adjustment state for PUSCH transmission. In this case, it is unclear how to determine the UL power for SRS transmission.

[0062] In the case of PRACH transmission, the TCI field may not be included in the PDCCH order (DCI format 1-0) that triggers the PRACH transmission. In this case, it is also unclear how to determine the UL power for PRACH transmission.

[0063] In some scenarios, the terminal device 120 may receive, from the network device 110, a DCI including one or more SRS fields indicating one or more power control settings. The power control settings may provide, for each TRP, a Tx power and a Tx beam or precoder. The power control settings may be the same as or different from the power control settings provided via the integrated TCI framework.

[0064] FIG. 1D is a diagram showing an exemplary scenario 100D of a PC-related setting in which an embodiment of the present disclosure can be implemented. In the example of FIG. 1D, at timing T1, the terminal device may receive settings for PUSCH transmission, including one or more power control settings (e.g., SRI-PUSCH-PowerControl).

[0065] As shown in FIG. 1D, at timing T2, the terminal device may receive DCI for beam indication change of the beam, and the DCI includes one or more TCI fields. As indicated by reference numeral 151, the one or more TCI fields may indicate a first TCI state and a second TCI state. The first TCI state may include a first UL PC parameter setting, a first PL RS, and a first Tx beam. The first Tx power may be determined based on the first UL PC parameter setting and the first PL RS. The first PUSCH transmission may be transmitted to a first TPR based on the first Tx power and the first Tx beam. The second TCI state may include a second UL PC parameter setting, a second PL RS, and a second Tx beam. The second Tx power may be determined based on the second UL PC parameter setting and the second PL RS. The second PUSCH transmission may be transmitted to a second TPR based on the second Tx power and the second Tx beam.

[0066] Continuing to refer to FIG. 1D. At timing T3, the terminal device may receive DCI that schedules PUSCH transmission at timing T4, and the DCI includes one or more SRI fields. The SRI field may indicate one power control setting (e.g., SRI-PUSCH-PowerControl) included in the configuration of the PUSCH transmission. As indicated by reference numeral 152, the one or more SRI fields may include a first SRI indicating the first SRI-PUSCH-PowerControl and the first SRS resource, and a second SRI indicating the SRI-PUSCH-PowerControl and the second SRS resource. The first SRI-PUSCH-PowerControl may include a first UL PC parameter setting and a first PL RS. The first SRS resource may indicate a first Tx beam and a first Tx precoder. The first Tx power may be determined based on the first UL PC parameter setting and the first PL RS. The first PUSCH transmission may be transmitted to a first TPR based on the first Tx power, the first Tx beam, and the first Tx precoder. The second SRI-PUSCH-PowerControl may include a second UL PC parameter setting and a second PL RS. The second SRS resource may indicate a second Tx beam and a second Tx precoder. The second Tx power may be determined based on the second UL PC parameter setting and the second PL RS. The second PUSCH transmission may be transmitted to a second TPR based on the second Tx power, the second Tx beam, and the second Tx precoder.

[0067] In this case, it is unknown whether the PUSCH transmission at timing T4 is executed based on the procedure indicated by reference numeral 151 or 152.

[0068] Furthermore, due to different power limit assumptions, it may be necessary to update the impact of the maximum power according to the UE power class on the UL PC. Additionally, the boosting of DMRS power and PTRS power is all based on the "unused power" on those resource elements (REs) that are not used for data transmission. However, in STxMP, due to different power limit assumptions, those "unused powers" may or may not be available for boosting DMRS power and PTRS power.

[0069] In view of this, embodiments of the present disclosure provide communication solutions for UL PC to overcome the above and other potential problems. Referring to FIGS. 2 to 4, these solutions will be described below. FIGS. 2 and 4 are schematic diagrams of communication processes according to some exemplary embodiments of the present disclosure. For the sake of explanation, these processes will be described with reference to FIGS. 1A to 1C.

[0070] Each of these 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 optionally, 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 first panel 125-1 and the second panel 125-2 may be deployed on the terminal device 120. Furthermore, the first panel 125-1 corresponds to the first set of antenna ports, and the second panel 125-2 corresponds to the second set of antenna ports.

[0071] Additionally, the first TRP 130-1 is connected to the first network device 110-1, and the second TRP 130-2 is connected to the first network device 110-1 / the second network device 110-2. Additionally, the first TRP 130-1 and the second TRP may be in the same serving cell or in different serving cells.

[0072] In the following text, some embodiments of the present disclosure will be described with reference to two TRPs and two panels. However, these embodiments are for illustrative purposes only and are intended to assist those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitation on the scope of the present disclosure. It should be understood that the content of the present disclosure described herein can be implemented in various ways different from the methods described below.

[0073] Furthermore, it should be understood that the operations in the terminal device 120 and the network device 110 should be coordinated. In other words, the network device 110 and the terminal device 120 should have a common understanding regarding settings, parameters, etc. Such a common understanding may be achieved through 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 will be described from the perspective of the terminal device 120, but it should be understood that the corresponding operations should be executed by the network device 110. Similarly, some operations will be described from the perspective of the network device 110, but it should be understood that the corresponding operations should be executed by the terminal device 120. For the sake of brevity, some parts of the same or similar content are omitted here.

[0074] Additionally, in the following description, several interactions (e.g., exchange of capability-related information, resource / transmission setting / scheduling / activation, etc.) are executed between the terminal device 120 and the network device 110. It should be understood that the interaction may be realized within one signaling / message or multiple signaling / messages, including system information, radio resource control (RRC) messages, DCI, uplink control information (UCI), medium access control (MAC) control elements (CE), etc. The present disclosure is not limited in this regard.

[0075] In some embodiments, the one or more interactions may be specific to a particular panel, TRP, capability value, CORESET, etc. Thus, it is possible to flexibly configure or activate PUSCH STxMP.

[0076] Also, although the features / operations have been separately described for specific exemplary embodiments, it should be understood that these features / operations described in different exemplary embodiments may be used in any suitable combination, unless there is an express contrary indication. Example of realizing UL PC in integrated TCI framework

[0077] For the sake of illustration, first, some descriptions of the integrated TCI framework and PL estimation are given as follows.

[0078] The integrated TCI for MTRP may include any of the following. · In the case of MTRP operation, within a component carrier (CC) / bandwidth part (BWP), up to four indicated TCI states · The indicated TCI state is updated by necessary MAC-CE based TCI state activation by MAC-CE or DCI. · One of the following combinations with two sets of the indicated TCI states may be configured / provided for the UE for DL and / or UL MTRP operations in a CC / BWP. · One of the indicated combined TCI states + one of the indicated combined TCI states, · One pair of the indicated DL and UL TCI states + one pair of the indicated DL and UL TCI states, · One pair of the indicated DL and UL TCI states + one of the indicated DL TCI states, · One pair of the indicated DL and UL TCI states + one of the indicated UL TCI states, · One of the indicated combined TCI states + one pair of the indicated DL and UL TCI states, · One of the indicated combined TCI states + one of the indicated DL TCI states, · One of the indicated combined TCI states + one of the indicated UL TCI states.

[0079] In the case of PL estimation based on PL RS, the path loss may be determined based on the following formula (1).

Equation

[0080] FIG. 2 is a schematic diagram showing a communication process 200 for UL PC within an integrated TCI framework according to some exemplary embodiments of the present disclosure. For the sake of explanation, process 200 will be described with reference to FIGS. 1A - 1C.

[0081] Referring to FIG. 2, the terminal device 110 may transfer UE capability information to the network device 120 (205). For example, the network device 120 may transmit radio resource control (RRC) settings regarding UE capability reporting to the terminal device 110. The terminal device 110 may report the capabilities of the terminal device 110 to the network device 120 based on the RRC settings.

[0082] In some embodiments, the UE capability report may include at least one of information regarding which signaling the UE supports with higher priority, information regarding whether the UE supports the setting of TCI state information used for PC, information regarding which default rules the UE supports, or information regarding whether the UE supports default rules. It should be understood that any other suitable capability report is also possible. 1. UL PC for PUSCH transmission

[0083] As shown in FIG. 2, the network device 110 transmits (210) the SRS transmission setting (for convenience, also referred to as the SRS setting or the first setting in this specification) to the terminal device 120. In some embodiments, the SRS setting may include two SRS resource sets. For example, the two SRS resource sets may be set to have the parameter "usage" set to "noncodebook" or "codebook". It should be understood that the number of SRS resource sets is not limited to 2, and any other appropriate number is also possible.

[0084] In some embodiments, the SRS setting may include the information of the TCI state used for the PC (for convenience, also referred to as the first information in this specification). For example, each SRS resource set may be set to have one upper layer parameter "UseIndicatedTCIState" or any other appropriate parameter having a similar function. The first information may be carried by the upper layer parameter "UseIndicatedTCIState" or any other appropriate parameter having a similar function.

[0085] In some embodiments, the first information may include the identity of the TCI state. For example, when two or more TCI states are active, for example, when two or more TCI states are indicated via the TCI field in the DCI, the first information may include information regarding "using the first TCI state" and "using the second TCI state", or, as a whole, information regarding "which TCI state to use".

[0086] In some embodiments, the first information may include an association between the identity of an SRS resource set and the identity of a TCI state. In other words, the first information may be sorted by a mapping between the SRS resource set ID and the TCI state ID. For example, the first SRS resource set ID may be explicitly or implicitly associated with the first TCI state ID. Alternatively, two or more TCI states may be active based on other configuration / activation signaling, such as RRC or MAC C, or based on predefined rules (i.e., not limited to the case where the TCI state is indicated via the TCI field in DCI).

[0087] In some embodiments, the first information may include an association between the identity of an SRS resource set and the identity of a TRP or a CORESET or a CORESET group or a search space set, and an association between the identity of the TRP or the CORESET or the CORESET group or the search space set and the identity of a TCI state. In other words, the first information may include an association between the SRS resource set and the TRP, for example, a configuration of an association between the SRS resource set and the CORESET / CORESET group / search space set. When two or more TCI states are indicated, each of the TCI states should be associated with a different TRP, and the terminal device 120 may find "which TCI state to use" for each of the SRS resource sets.

[0088] In some embodiments, the first information includes a first value of a power control adjustment state, and the first value indicates a TCI state used for the PC. In other words, the first information may include a setting of a power control adjustment state (e.g., srs-PowerControlAdjustmentStates). The parameter "srs-PowerControlAdjustmentStates" may have different values, e.g., "sameAsFci1" and "sameAsFci2", or "sameAsFci2" and unspecified, for two SRS resource sets. Alternatively, the parameter "srs-PowerControlAdjustmentStates" may be set to 0 and 1, respectively, for the two SRS resource sets. For example, h_(b,f,c)(i,l)=f_(b,f,c)(i,l), where h_(b,f,c)(i,l) represents the SRS power control adjustment state and f_(b,f,c)(i,l) represents the current PUSCH power control adjustment state, and where l may be set to 0 and 1, respectively, for the two SRS resource sets.

[0089] In some embodiments, the first information (e.g., useIndicatedTCIState) may be set for DL / UL channels including PDCCH / PDSCH / PUCCH / PUSCH. In some embodiments, the first information (e.g., useIndicatedTCIState) may be set for DL / UL reference signals including CSI-RS / SRS. In some embodiments, the first information (e.g., useIndicatedTCIState) may be set for DL / UL cells / BWPs / bands. In some embodiments, the first information (e.g., useIndicatedTCIState) may include more detailed information such as the indicated TCI state used to determine the QCL type A / B / C / D parameters, UL Tx beam, UL Tx power, PL RS, alpha, closedloopindex, P0, respectively.

[0090] Continuing to refer to FIG. 2, the network device 110 may send a setting for PUSCH transmission (for convenience, also referred to as the second setting in this specification) to the terminal device 120 (220). In some embodiments, the second setting may include one or more PC settings.

[0091] As shown in FIG. 2, the network device 110 may send an indication indicating an active TCI state (for convenience, also referred to as the first indication in this specification) (230). For example, the network device 110 may send DCI for beam indication change, and the TCI field in the DCI may indicate the active TCI state. It should be understood that the first indication may be sent in any other suitable way.

[0092] The network device 110 also sends an indication indicating PC information (for convenience, also referred to as the second indication in this specification) (240). For example, the network device 110 may send DCI for scheduling PUSCH transmission, and the SRI field in the DCI may indicate PC settings. It should be understood that the second indication may be sent in any other suitable way.

[0093] Alternatively, the terminal device 120 receives the first indication and the second indication. In this case, as shown in FIG. 2, the terminal device 120 may determine one of the first and second indications for use in the PC (250).

[0094] In some embodiments, the first indication (i.e., the TCI state) may have a higher priority than the second indication (i.e., the SRI). In some embodiments, the second indication (i.e., the SRI) may have a higher priority than the first indication (i.e., the TCI state). In this case, the terminal device 120 may determine one of the first and second indications based on the priorities of the first and second indications.

[0095] In some embodiments, the network device 110 is responsible for ensuring the same settings provided by the first and second instructions. In some embodiments, the terminal device 120 does not expect different PC settings to be provided by the first and second instructions. In some embodiments, the first instruction and the second instruction provide the same power control information. For example, the PC parameter settings and PL RS provided by the TCI state and the SRI in the DCI refer to the same parameter values, such as RS ID, estimated PL, and ultimately the same Tx power. In this case, the terminal device 120 may determine either the first or the second instruction.

[0096] In some embodiments, the first setting (i.e., the SRS setting) includes the first information of the TCI state used for PC. In other words, the first information (e.g., UseIndicatedTCIState) must be set for the SRS resource set. In this case, the terminal device 120 may calculate the same power based on the first and second instructions. Alternatively, the terminal device 120 may calculate the power using the first instruction.

[0097] Continuing to refer to FIG. 2, the terminal device 120 may determine the transmission power of the PUSCH transmission (also referred to as the first transmission power for convenience) based on the first and second settings and one of the first and second instructions (260). In some embodiments, the timing relationship between the two DCIs and the application timing of the PL RS may be considered.

[0098] In some embodiments where the first instruction (i.e., the TCI state) has a higher priority than the second instruction (i.e., the SRI), the terminal device 120 may ignore the PC information indicated by the second instruction before the application timing of the PC information indicated by the first instruction. FIG. 3A is a diagram showing an exemplary scenario 300A of application timing according to some embodiments of the present disclosure.

[0099] In the example of FIG. 3A, at timing t1, the terminal device 120 may receive DCI for beam indication, and the DCI includes one or more TCI fields. At timing t2, the terminal device may receive DCI for scheduling PUSCH transmission at timing t3, and the DCI includes one or more SRI fields. In this case, the terminal device 120 may ignore the PC information indicated by the received SRI during t1 + application timing, where t1 represents the time when the DCI for beam indication change is received or the time when the reception of the DCI is confirmed, and the application timing represents signaling decoding timing, panel switching timing, beam application timing, PL RS application timing, PUSCH preparation timing, or any other appropriate timing, or any combination of the above timings, or the maximum of the above timings.

[0100] In some embodiments where the first indication (i.e., TCI state) has a higher priority than the second indication (i.e., SRI), the terminal device 120 may override the PC information indicated by the second indication with the PC information indicated by the first indication before the application timing of the PC information indicated by the second indication. FIG. 3B is a diagram showing another exemplary scenario 300B of application timing according to some embodiments of the present disclosure.

[0101] In the example of FIG. 3B, at timing t4, the terminal device may receive DCI that schedules PUSCH transmission at timing t6, and the DCI includes one or more SRI fields. At timing t5, the terminal device 120 may receive DCI for beam indication, and the DCI includes one or more TCI fields. In this case, even if it is before t4 + application timing, the terminal device 120 may override the PC information indicated by the SRI with the PC information indicated by the TCI state, that is, during t4 + application timing, the PC information indicated by the SRI may be ignored, where t4 represents the time point when the DCI for beam indication change is received or the time point when the reception of the DCI is confirmed, and the application timing represents signaling decoding timing, panel switching timing, beam application timing, PL RS application timing, PUSCH preparation timing, or any other appropriate timing, or any combination of the above timings, or the maximum of the above timings.

[0102] In some embodiments where the second indication (i.e., SRI) has a higher priority than the first indication (i.e., TCI state), the terminal device 120 may ignore the PC information indicated by the first indication before the application timing of the PC information indicated by the second indication. FIG. 3C is a diagram showing another exemplary scenario 300C of application timing according to some embodiments of the present disclosure.

[0103] In the example of FIG. 3C, at timing t7, the terminal device 120 may receive DCI for beam indication, and the DCI includes one or more TCI fields. At timing t8, the terminal device may receive DCI for scheduling PUSCH transmission at timing t9, and the DCI includes one or more SRI fields. In this case, even if it is before t7 + application timing, the terminal device 120 may override the PC information indicated by the TCI state with the PC information indicated by the SRI, that is, during t10 + application timing, the PC information indicated by the TCI state may be ignored, where t7 represents the time point when the DCI for beam indication change is received or the time point when the reception of the DCI is confirmed, and the application timing represents signaling decoding timing, panel switching timing, beam application timing, PL RS application timing, PUSCH preparation timing, or any other appropriate timing, or any combination of the above timings, or the maximum of the above timings.

[0104] In some embodiments where the second indication (i.e., SRI) has a higher priority than the first indication (i.e., TCI state), the terminal device 120 may override the PC information indicated by the first indication with the PC information indicated by the second indication before the application timing of the PC information indicated by the first indication. FIG. 3D is a diagram showing another exemplary scenario 300D of application timing according to some embodiments of the present disclosure.

[0105] In the example of FIG. 3D, at timing t10, the terminal device may receive DCI that schedules PUSCH transmission at timing t12, and the DCI includes one or more SRI fields. At timing t11, the terminal device 120 may receive DCI for beam indication change of the beam, and the DCI includes one or more TCI fields. In this case, the terminal device 120 may ignore the PC information indicated by the TCI state during t10 + application timing, where t10 represents the time point when the DCI for beam indication change is received or the time point when the reception of the DCI is confirmed, and the application timing represents signaling decoding timing, panel switching timing, beam application timing, PL RS application timing, PUSCH preparation timing, or any other appropriate timing, or any combination of the above timings, or the maximum of the above timings.

[0106] It should be understood that FIGS. 3A to 3D are merely examples and do not limit the present disclosure.

[0107] Based on the determined PC information (for example, PC parameter setting and PL RS), the terminal device 120 may calculate the transmission power of the PUSCH. In some embodiments, when the terminal device 120 uses the parameter set setting with index j and the PUSCH power control adjustment state with index l to transmit PUSCH on the active UL BWP b of carrier f of serving cell c, the terminal device 120 may determine the PUSCH transmission power at the PUSCH transmission opportunity i as shown in the following formula (2).

Number

Number

Number

Number

Number

Number

Number

Number

Number

Number

Number

Number

Number

Number

[0108] It should be understood that Equation (2) is only an example, and any other suitable method is also possible.

[0109] In this way, it is possible to eliminate the ambiguity in determining the UL power. 2. UL PC for SRS transmission

[0110] Continuing to refer to FIG. 2, the terminal device 120 may also determine the transmission power of the SRS (for convenience, also referred to as the second transmission power in this specification) (270).

[0111] In some embodiments where the first information is set or activated, the terminal device 120 may determine the TCI state used for the PC based on the first information and the first instruction. That is, the terminal device 120 may select one of the active TCI states indicated by the first instruction based on the explicit or implicit information of the TCI state in the first information. Then, the terminal device 120 may determine the transmission power of the SRS based on the PC information (e.g., PC parameter settings and PL RS) associated with the determined TCI state.

[0112] In some embodiments, the first information may not be set or activated. In this case, if an individual TCI state is set for the SRS resource, the transmission power may be determined based on the individual TCI state. If an individual TCI state is not set for the SRS resource, the transmission power may be determined based on some default rules described later.

[0113] In some embodiments, when the terminal device 120 transmits the SRS on the active UL BWP b of the carrier f of the serving cell c using the SRS power control adjustment state with index l, the terminal device 120 may determine the SRS transmission power at the SRS transmission opportunity i as shown in Equation (3) below.

Equation

Number

Number

Number

Number

Number

Number

Number

Number

Number

[0114] It should be understood that Equation (3) is only an example, and any other suitable method is also possible.

[0115] In this way, it becomes possible to achieve a rapid update regarding the UL transmission power when changing one or more UL beams. 3. UL PC for PRACH transmission

[0116] Continuing to refer to FIG. 2, the terminal device 120 may also determine the transmission power of the PRACH transmission (for convenience, also referred to as the third transmission power in this specification) (280). In some embodiments, when the PRACH transmission power is determined, an integrated TCI state may be provided for reference signal power selection. In some embodiments, when two or more TCI states are active for the PDCCH carrying the PDCCH order, the PDCCH order may provide reference signal power selection information.

[0117] In some embodiments, the terminal device 120 may receive information (for convenience, also referred to as the second information in this specification) including at least one of the TCI state used for reference signal power determination or the TCI state used for PL RS determination from the network device 110 (281). Then, the terminal device 120 may determine the transmission power of the PRACH transmission (for convenience, also referred to as the third transmission power in this specification) based on the second information (282).

[0118] In some embodiments, when there are two or more active TCI states for the PDCCH providing the PDCCH order, the terminal device 120 expects that the PDCCH order provides information on which TCI state is used for reference signal power determination, for example, which RS the terminal device 120 uses when applying the value provided by powerControlOffsetSS. That is, the terminal device 120 expects that the PDCCH order provides information regarding to which TRP the PRACH is transmitted or which RS is used as the PL RS.

[0119] Such information may be indicated via an additional field within the PDCCH order. Alternatively, such information may be implicitly indicated via existing fields, such as a random access preamble index, an SS / PBCH index, a PRACH mask index. The association between those indexes and the TRP needs to be preconfigured. In some embodiments, the second information may include the configuration of the association between those indexes and the TRP, for example, the association between those indexes and a CORESET / CORESET group / search space set. Alternatively, as will be described later, some default rules may be applied for selection.

[0120] In some embodiments, the terminal device 120 expects that the active TCI state for the PDCCH providing the PDCCH order is associated with the PL RS, and the associated PL RS is used for PL estimation including reference signal power selection and RSRP measurement. In some embodiments, the terminal device 120 expects that the active TCI state for the PDCCH providing the PDCCH order provides an RS of QCL type D that can be used for PL estimation. When the active TCI state is actually a pair of DL and UL TCI states, the terminal device 120 may apply the PL RS provided in the UL TCI state.

[0121] In some embodiments, when the TCI state used for reference signal power determination is associated with a cell different from the serving cell of the terminal device 120 (for convenience, also referred to as the first cell in this specification), the terminal device 120 may obtain the reference signal power (for example, ss-PBCH-BlockPower) from the first cell.

[0122] In some embodiments, when the terminal device 120 transmits a PRACH on the active UL BWP b of carrier f of the serving cell c, the terminal device 120 may determine the PRACH transmission power at the PRACH transmission opportunity i as shown in the following formula (4). [Number] Here, [Number] represents the PRACH transmission power, [Number] represents the set maximum output power, [Number] represents the target power P, [Number] represents the downlink path loss estimation value (dB) calculated by the UE.

[0123] It should be understood that Equation (4) is only an example, and any other appropriate method is also possible.

[0124] In this way, it is possible to accurately calculate the PRACH transmission power. 4. Default rules for UL PC

[0125] In some scenarios, the power control parameter setting may not be provided by the applied TCI state. In this case, the terminal device 120 may determine the power control parameter setting using the default rule.

[0126] In some embodiments, the terminal device 120 may determine the power control parameter setting based on the power control parameter setting associated with the TCI state including the power control setting ID. In other words, the terminal device 120 may determine the power control parameter setting based on another TCI state. For example, the terminal device 120 may determine the power control parameter setting based on the TCI state applied to the associated CORESET. As another example, the terminal device 120 may determine the power control parameter setting based on the TCI state applied to the CORESET having a specific ID, for example, the lowest ID or the lowest N IDs. As yet another example, the terminal device 120 may determine the power control parameter setting based on the TCI state having a specific ID, for example, the lowest ID or the lowest N IDs.

[0127] In some embodiments, the terminal device 120 may determine the power control parameter setting based on the power control parameter setting having a pre-determined ID. In other words, the terminal device 120 may determine the power control parameter setting based on another PC parameter setting. For example, the terminal device 120 may determine the power control parameter setting based on the PC parameter setting having a specific ID, for example, 0 or 1. This ID may be, for example, sri-PUSCH-PowerControlId, Uplink-powerControlID, etc. As another example, the terminal device 120 may determine the power control parameter setting based on the last applied PC parameter setting.

[0128] In some embodiments, the terminal device 120 may determine the power control parameter setting based on the power control parameter setting applied to the random access procedure within a certain period. For example, the terminal device 120 may determine the power control parameter setting based on the power control parameter setting last applied to the random access procedure. It should be understood that the terminal device 120 may also determine the power control parameter setting based on any other appropriate procedure other than the random access procedure.

[0129] It should be understood that any combination of the above and any other appropriate rules is also possible.

[0130] In some scenarios, the PL RS may not be provided by the applied TCI state. In this case, the terminal device 120 may determine the PL RS using the default rule.

[0131] In some embodiments, the terminal device 120 may determine the PL RS based on the TCI state including the setting of the PL RS. In other words, the terminal device 120 may determine the PL RS based on another TCI state. For example, the terminal device 120 may determine the PL RS based on the TCI state applied to the associated CORESET. As another example, the terminal device 120 may determine the PL RS based on the TCI state applied to the CORESET having a specific ID, for example, the lowest ID or the lowest N IDs. As yet another example, the terminal device 120 may determine the PL RS based on the TCI state having a specific ID, for example, the lowest ID or the lowest N IDs.

[0132] In some embodiments, the terminal device 120 may determine the PL RS based on a pre-determined PL RS. In other words, the terminal device 120 may determine the PL RS based on another PL RS. For example, the terminal device 120 may determine the PL RS based on a PL RS having a specific ID, such as 0 or 1. The ID may be, for example, sri-PUSCH-PowerControlId, Uplink-powerControlID, PUSCH-PathlossReferenceRS-Id, PUSCH-PathlossReferenceRS-Id, PUCCH-PathlossReferenceRS-Id, SRS-PathlossReferenceRS-Id, SRS resource ID, CSI-RS resource ID, SS / PBCH index, etc. As another example, the terminal device 120 may determine the PL RS based on the last applied PL RS.

[0133] In some embodiments, the terminal device 120 may determine the PL RS based on the PL RS applied for the random access procedure within a certain period. For example, the terminal device 120 may determine the PL RS based on the last applied PL RS for the random access procedure. It should be understood that the terminal device 120 may also determine the PL RS based on any other suitable procedure other than the random access procedure.

[0134] It should be understood that any combination of the above and any other suitable rules is also possible.

[0135] In some embodiments, the terminal device 120 may apply one or more default rules only within a CORESET / TCI / RS set associated with the same TRP. In some embodiments, when the first TCI state is not associated with PC information, the terminal device 120 may apply one or more default rules to determine the first PC parameter settings and / or the first PL RS. In some embodiments, when the second TCI state is not associated with PC information, the terminal device 120 may apply one or more default rules to determine the second PC parameter settings and / or the second PL RS. In some embodiments, when both the first TCI state and the second TCI state are not associated with PC information, the terminal device 120 may apply one or more default rules to determine the first and second PC parameter settings and / or the first and second PL RS.

[0136] Thus, even if the PC information is not provided by the applied TCI state, the terminal device can correctly find the PC information. Example of realizing UL PC for STxMP

[0137] For the sake of illustration, first, some explanations about the STxMP-MTRP method and UE power class will be given as follows.

[0138] The STxMP-MTRP method may include any of the following. · SDM method: Different layers / DMRS ports of one PUSCH are precoded separately and transmitted simultaneously from different UE panels. · FDM-B method: Two PUSCH transmission opportunities with the same / different RVs of the same TB are transmitted from different UE panels on non-overlapping frequency domain resources and the same time domain resources. · FDM-A method: Different parts of the frequency domain resources of one PUSCH transmission opportunity are transmitted from different UE panels. · SFN-based transmission method: All of the same layer / DMRS ports of one PUSCH are transmitted simultaneously from two different UE panels. · SDM repetition method: Two PUSCH transmission opportunities with the same / different RVs of the same TB are transmitted simultaneously from two different UE panels.

[0139] The following Table 1 shows exemplary assumptions for UE types.

Table 1

[0140] The following Table 2 shows an example of the UE maximum output power limit for UL MIMO for Power Class 1.

Table 2

[0141] The UE may set its maximum output power. The set UE maximum output power P for carrier f of serving cell c CMAX,f,c is defined as the maximum output power available for the reference point of a given transmitter branch corresponding to the reference point of the RSRP measurement value after upper layer filtering specified in TS 38.215.

[0142] In the case of per-panel power limitation, each panel may transmit at maximum power and may be used simultaneously. In the case of cross-panel power limitation (also referred to as per-UE power limitation), it is possible to achieve maximum power when the panels are used simultaneously. In the case of cross-panel power limitation with power sharing, it is possible to achieve maximum power for one panel. In the case of cross-panel power limitation without power sharing, it may not be possible to achieve maximum power for the one panel when it is used.

[0143] Under some assumptions, the total power limit per UE on all UE panels used for STxMP, or the sum of the power limits per panel for STxMP, may be different from (e.g., greater than) the existing power limit for a given power class. Under some assumptions, the total power limit per UE on all UE panels used for STxMP, or the sum of the power limits per panel for STxMP, may not be different from (e.g., less than) the existing power limit for a given power class. In some assumptions, the sum of the power limits per panel may be greater than the total power limit per UE. In some assumptions, the sum of the power limits per panel may be less than or equal to the total power limit per UE.

[0144] FIG. 4 is a schematic diagram of a communication process 400 for UL PC for STxMP according to some exemplary embodiments of the present disclosure. For the sake of explanation, process 400 will be described with reference to FIGS. 1A-1C. In this example, panels 125-1 and 125-2 are deployed in terminal device 120. It should be understood that process 400 may be applied to more panels.

[0145] Referring to FIG. 4, terminal device 110 may transfer UE capability information to network device 120 (405). For example, network device 120 may send radio resource control (RRC) settings related to UE capability reporting to terminal device 110. Terminal device 110 may report the capabilities of terminal device 110 to network device 120 based on the RRC settings.

[0146] In some embodiments, the UE capability report may include at least one of information regarding whether the UE supports one or more power assumptions, information regarding whether the UE supports the calculation of PUSCH / PUCCH / SRS / PRACH Tx power information per panel, information regarding whether the UE supports the calculation of PHR per panel, information regarding whether the UE supports the calculation of PUSCH-DMRS power ratio per panel, information regarding whether the UE supports the calculation of PUSCH-PTRS power ratio per panel, the number of Pcmax supported by the UE, or the number of PHR supported by the UE. It should be understood that any other appropriate capability report is also possible. 1. UL transmission power calculation

[0147] As shown in Figure 4, the network device 110 may send an STxMP instruction to the terminal device 120 (410). In some embodiments, the STxMP instruction may include an instruction for the STxMP-MTRP mode, for example, the SDM mode, the FDM-B mode, the FDM-A mode, the SFN-based transmission mode, or the SDM repetition mode. In some embodiments, the STxMP instruction may include a switch between the non-STxMP mode and the STxMP mode. It should be understood that the STxMP instruction may further include any other appropriate information.

[0148] In response to the instruction, the terminal device 120 may perform UL transmission (e.g., PUSCH or any other appropriate UL transmission) simultaneously on panels 125-1 and 125-2. The terminal device 120 may determine the transmission power of the uplink transmission based on at least one power limit for the panel (420). Power limit per panel

[0149] In some embodiments where the power limit per panel is used, the power limit may include a first threshold power (e.g., the first Pcmax) for panel 125-1 and a second threshold power (e.g., the second Pcmax) for panel 125-2.

[0150] In some embodiments, the first threshold power and the second threshold power may be based on information provided via a UE capability report or a PHR report.

[0151] In some embodiments, the first Pcmax and the second Pcmax may be the same. For example, the terminal device 120 may determine Pcmax based on the UE power class and determine that the first Pcmax = the second Pcmax = Pcmax. Since the total power when STxMP is enabled may exceed the upper limit, it may be necessary to redefine the UE power class. In some alternative embodiments, the terminal device 120 may determine that the first Pcmax = the second Pcmax = Pcmax / 2.

[0152] In some embodiments, the first Pcmax and the second Pcmax may be different, and (the first Pcmax + the second Pcmax) ≤ Pcmax. It should be understood that the two panels may be extended to N panels, where N is greater than 2.

[0153] In some embodiments, the terminal device 120 may determine the transmission power for panel 125-1 based on the first Pcmax and determine the transmission power for panel 125-2 based on the second Pcmax. For example, the terminal device 120 may determine the transmission power for panel 125-1 and the transmission power for panel 125-2 respectively based on the above formula (2). The parameters in formula (2) are associated with the same panel.

[0154] Then, the terminal device 120 may determine the transmission power for the UL transmission (i.e., the first transmission power) based on the transmission power for panel 125-1 and the transmission power for panel 125-2. For example, the transmission power for the UL transmission may be equal to the sum of the transmission power for panel 125-1 and the transmission power for panel 125-2. Cross-panel power limitation without inter-panel power sharing

[0155] In some embodiments where cross-panel power limiting is used, the power limit may include a threshold power (e.g., Pcmax). In some embodiments, the threshold power may be based on the currently defined UE power class.

[0156] In some embodiments, the terminal device 120 may determine a scaled threshold power based on the threshold power divided by the number of panels. For example, the terminal device 120 may scale Pcmax by 1 / N for each panel, where N represents the number of panels used for simultaneous transmission. Alternatively, N may be the total number of panels of the UE. In some embodiments, N may be based on information provided via a UE capability report or a PHR report.

[0157] Then, the terminal device 120 may determine the transmission power for panel 125-1 based on the scaled threshold power, and determine the transmission power for panel 125-2 based on the scaled threshold power. For example, the terminal device 120 may determine the transmission power for panel 125-1 and the transmission power for panel 125-2 respectively based on the above formula (2). The parameters in formula (2) are associated with the same panel.

[0158] Accordingly, the terminal device 120 may determine the transmission power for the UL transmission (i.e., the first transmission power) based on the transmission power for panel 125-1 and the transmission power for panel 125-2. For example, the transmission power for the UL transmission may be equal to the sum of the transmission power for panel 125-1 and the transmission power for panel 125-2. Cross-panel power limiting with inter-panel power sharing

[0159] In some embodiments where cross-panel power limiting is used, the power limit may include a threshold power (e.g., Pcmax). In some embodiments, the threshold power may be based on the currently defined UE power class.

[0160] In some embodiments, the terminal device 120 may determine the transmission power for panel 125-1 based on the threshold power and determine the transmission power for panel 125-2 based on the threshold power. For example, the terminal device 120 may determine the transmission power for panel 125-1 based on the following formula (5).

Number

Number

Number

Number

Number

Number

Number

Number

Number

[0161] For example, the terminal device 120 may determine the transmission power for the panel 125-2 based on the following formula (6).

Number

Number

Number

Number

Number

Number

Number

Number

Number

[0162] The terminal device 120 may determine whether the sum of the transmission power for panel 125-1 and the transmission power for panel 125-2 is greater than a threshold power (i.e., Pcmax). When the sum is less than the threshold power, the terminal device 120 may determine the transmission power of the UL transmission based on the transmission power for panel 125-1 and the transmission power for panel 125-2.

[0163] When the sum is greater than the threshold power, the terminal device 120 may determine the scaled transmission power for panel 125-1 based on the transmission power for panel 125-1 and the ratio of the threshold power to the sum. For example, the terminal device 120 may determine the scaled transmission power for panel 125-1 based on the following formula (7).

Number

Number

Number

Number

[0164] Similarly, the terminal device 120 may determine the scaled transmission power for panel 125-2 based on the transmission power for panel 125-2 and the ratio of the threshold power to the sum. For example, the terminal device 120 may determine the scaled transmission power for panel 125-2 based on the following formula (8).

Number

[0165] And the terminal device 120 may determine the transmission power of the UL transmission based on the scaled transmission power for panel 125-1 and the scaled transmission power for panel 125-2. For example, the transmission power for the UL transmission may be equal to the sum of the scaled transmission power for panel 125-1 and the scaled transmission power for panel 125-2.

[0166] In this way, it is possible to correctly calculate the UL power without violating the limit on the maximum radiated power. 2. UL DMRS power calculation

[0167] Continuing to refer to FIG. 4, the terminal device 120 may determine the transmission power for the RS transmission (for convenience, also referred to as the second transmission power in this specification) based on the at least one power limit, the transmission power of the UL transmission, and the ratio of the power-related parameters between the UL transmission and the RS transmission (430). According to an embodiment of the present disclosure, the ratio of the power-related parameters between the UL transmission and the RS transmission is determined based on the at least one power limit.

[0168] In some embodiments, the RS transmission may be a demodulation reference signal (DMRS) transmission, and the ratio of the power-related parameters may be a PUSCH-to-DMRS power ratio. In some embodiments, the PUSCH-to-DMRS power ratio may be a PUSCH-to-DMRS energy per resource element (EPRE) ratio. It should be understood that the PUSCH-to-DMRS power ratio may also adopt any other form.

[0169] In some embodiments where cross-panel power limitation is used, when the terminal device 120 supports inter-panel power sharing, the PUSCH-to-DMRS EPRE ratio may be based on the number of DMRS CDM groups without data.

[0170] In some embodiments where per-panel power limitation is used, the PUSCH-to-DMRS power ratio may be determined based on the number of DMRS code division multiplexing (CDM) groups without data per panel. This will be described in more detail in relation to Embodiments 1 to 3. Embodiment 1

[0171] In this embodiment, per-panel power boosting may be performed using "per-panel PUSCH-DMRS power ratio" or "per-layer PUSCH-DMRS power ratio" or "per-panel per-layer PUSCH-DMRS power ratio" or "per-panel PUSCH-DMRS EPRE ratio" or "per-layer PUSCH-DMRS EPRE ratio" or "per-panel per-layer PUSCH-DMRS EPRE ratio" or "per-layer per-panel PUSCH-DMRS EPRE ratio" instead of "PUSCH-DMRS EPRE ratio".

[0172] In some embodiments, the terminal device 120 may determine a first PUSCH-to-DMRS power ratio for panel 125-1 based on the number of DMRS CDM groups without data associated with panel 125-1. In some embodiments, the terminal device 120 may determine the first PUSCH-to-DMRS power ratio by searching a table that includes a mapping between the PUSCH-to-DMRS power ratio for a panel and the number of DMRS CDM groups without data associated with the panel. In some embodiments, the terminal device 120 may calculate a value (represented as R) based on the following formula (8’), and determine the first PUSCH-to-DMRS power ratio by rounding up or down the R value, or by taking a predetermined number of decimal places for the R value. The predetermined number may be any suitable positive integer. R = 10 log10(X) (8’) Here, R represents an intermediate value for calculating the PUSCH-to-DMRS power ratio, and X represents the number of DMRS CDM groups without data associated with the panel.

[0173] Then, the terminal device 120 may determine the transmission power for the first DMRS transmission via panel 125-1 based on the transmission power for the first UL transmission via panel 125-1 and the first PUSCH-to-DMRS power ratio.

[0174] Similarly, the terminal device 120 may determine a second PUSCH-to-DMRS power ratio for panel 125-2 based on the number of DMRS CDM groups without data associated with panel 125-2. In some embodiments, the terminal device 120 may determine the second PUSCH-to-DMRS power ratio by searching a table that includes a mapping between the PUSCH-to-DMRS power ratio for a panel and the number of DMRS CDM groups without data associated with the panel. In some embodiments, the terminal device 120 may calculate an R value based on Equation (8’), and determine the second PUSCH-to-DMRS power ratio by rounding up or down the R value, or by taking a predetermined number of digits after the decimal point for the R value. The predetermined number may be any suitable positive integer.

[0175] Then, the terminal device 120 may determine the transmission power for the second DMRS transmission via panel 125-2 based on the transmission power for the second UL transmission via panel 125-2 and the second PUSCH-to-DMRS power ratio.

[0176] Table 3 below shows exemplary values for the “antenna port” field.

Table 3

Table 4

Table 5

[0177] It should be understood that Tables 3 to 5 are merely examples, and any other suitable methods are also possible.

[0178] For example, the number of DMRS CDM groups without data may be provided within the "antenna ports" field of the DCI (e.g., format 0_1 or 0_2). The number of DMRS CDM groups without data may be "1", "2", or "3" corresponding to CDM groups 0, {0,1}, and {0,1,2}, respectively.

[0179] If the value of the "antenna ports" field is "2", it can be seen from Table 3 that the number of DMRS CDM groups without data is "2" and the DMRS port is 0. Also, it can be seen from Table 4 that DMRS may be transmitted 3 dB higher than UL transmission at port 0. Since the number of DMRS CDM groups without data is "2", the CDM group is {0,1}. It can be seen from Table 5 that port 0 and port 1 are associated with one panel (e.g., panel 125-1), and port 2 and port 3 are associated with another panel (e.g., panel 125-2).

[0180] For panel 125-1, DMRS may be transmitted 3 dB higher than UL transmission at port 0. However, since port 2 and port 3 are associated with another panel, this power may not be used for DMRS power boosting, i.e., 0 dB is assumed. The total value of the power for the two panels does not change for DMRS and PUSCH, and the EPRE ratio is 0 dB at present. However, for the DMRS-PUSCH power ratio per panel, DMRS may be transmitted 3 dB higher than PUSCH.

[0181] When the transmission power for the first DMRS transmission and the transmission power for the second DMRS transmission are determined, it is possible to determine the second transmission power. For example, the second transmission power may be the sum of the transmission power for the first DMRS transmission and the transmission power for the second DMRS transmission. Embodiment 2

[0182] In this embodiment, the terminal device may continuously use the "PUSCH-DMRS EPRE ratio" and count the "number of DMRS CDM groups without data" in consideration of whether the DMRS port and the ports in the DMRS CDM group without data are associated with the same panel.

[0183] In some embodiments, the terminal device 120 may determine whether a set of antenna ports in the DMRS CDM group without data and a set of antenna ports for DMRS transmission are associated with the same panel. If the set of antenna ports in the DMRS CDM group without data and the set of antenna ports for DMRS transmission are associated with different panels, the terminal device 120 may determine the number of updated DMRS CDM groups without data.

[0184] In some embodiments, the number of updated DMRS CDM groups without data may be determined by the following formula (9). Nu = N - X (9) Here, Nu represents the number of updated DMRS CDM groups without data, N represents the number of indicated DMRS CDM groups without data, and X represents the number of DMRS CDM groups on a panel different from the indicated DMRS port.

[0185] In some embodiments, the number of updated DMRS CDM groups without data may be determined by the following formula (10). Nu = Y, where Y ≤ N (10) Here, Nu represents the number of updated DMRS CDM groups without data, N represents the number of indicated DMRS CDM groups without data, and Y represents the number of DMRS CDM groups on the same panel as the indicated DMRS port. The indicated DMRS port may be a set DMRS port, a determined DMRS port, or a target DMRS port.

[0186] Equations (9) and (10) are merely examples, and it should be understood that any other suitable method is also possible. The present disclosure does not limit this aspect.

[0187] Then, the terminal device 120 may determine the PUSCH-to-DMRS power ratio based on the number of DMRS CDM groups without updated data. In some embodiments, the terminal device 120 may determine the PUSCH-to-DMRS power ratio by searching a table. In some embodiments, the terminal device 120 may calculate an R value based on Equation (8’), and determine the PUSCH-to-DMRS power ratio by rounding up or down the R value, or by taking a predetermined number of digits after the decimal point for the R value.

[0188] Then, the terminal device 120 may determine the transmission power of DMRS transmission based on the transmission power of UL transmission and the PUSCH-to-DMRS power ratio.

[0189] For example, if the value of the “antenna ports” field is “2”, it can be seen from Table 3 that the number of DMRS CDM groups without data is “2” and the DMRS port is 0. Since the number of DMRS CDM groups without data is “2”, the CDM group is {0,1}. It can be seen from Table 5 that one set of antenna ports in the DMRS CDM group without data includes ports 0, 1, 2, and 3 associated with a panel different from DMRS port 0. Since the ports in CDM group 0 are on the same panel as DMRS port 0 and the ports in CDM group 1 are on a panel different from DMRS port 0, based on Equation (9) or Equation (10), the number of DMRS CDM groups without updated data may be determined to be 1. Therefore, it can be seen from Table 4 that DMRS may be transmitted 0 dB higher than UL transmission at port 0, that is, the power may not be used for DMRS power boosting. Embodiment 3

[0190] In this embodiment, the number of DMRS CDM groups without data may be set to "1" regardless of the DMRS port number, that is, power boosting is not allowed.

[0191] In some embodiments, if per-panel power limitation is assumed or cross-panel power limitation is assumed and power sharing is not allowed, it is impossible to borrow power from other panels even if it is not used for data transmission.

[0192] In some embodiments, if cross-panel power limitation is assumed and power sharing between panels is allowed, the conventional boosting ratio may be assumed.

[0193] In this way, it is possible to correctly boost the DMRS for PUSCH demodulation. 3. UL PTRS power calculation

[0194] In some embodiments, the RS transmission may be a phase tracking reference signal (PTRS) transmission, and the ratio of the power-related parameters may be the PUSCH-to-PTRS power ratio. In some embodiments, the PUSCH-to-PTRS power ratio may be the PUSCH-to-PTRS power ratio per layer. It should be understood that the PUSCH-to-PTRS power ratio may also adopt any other form.

[0195] The PUSCH-to-PTRS power ratio per layer is related to the number of PUSCH layers, antenna ports, coherence type, and settings, and is used to boost the PTRS power when the corresponding resource elements are not used for data transmission.

[0196] When per-panel power limiting is used, or when cross-panel power limiting is used but power is not shared between panels, two PTRSs may be required, with one PTRS used for one panel. The PUSCH-to-DMRS power ratio per layer may be determined based on the number of PUSCH layers allocated to one panel.

[0197] In some embodiments, the terminal device 120 may determine the number of PUSCH layers allocated to panel 125-1 (hereinafter also referred to as the first PUSCH layer number for convenience in this specification), and based on the first PUSCH layer number, determine the first PUSCH-to-PTRS power ratio per layer for panel 125-1.

[0198] In some embodiments, the terminal device 120 may determine the first PUSCH-to-PTRS power ratio per layer by searching a table that includes a mapping between the PUSCH-to-PTRS power ratio per layer for a panel and the number of PUSCH layers associated with the panel.

[0199] In some embodiments, the terminal device 120 may calculate a value (represented as R') based on the following formula (10'), and determine the first PUSCH-to-PTRS power ratio per layer by rounding up or down the R' value, or by taking a predetermined number of decimal places for the R' value. The predetermined number may be any suitable positive integer. R' = 10 log10(X') (10') Here, R' represents an intermediate value for calculating the PUSCH-to-PTRS power ratio per layer, and X' represents the number of PUSCH layers associated with the panel.

[0200] Then, the terminal device 120 may determine the transmission power of the first PTRS transmission via panel 125-1 based on the first PUSCH-to-PTRS power ratio per layer and the transmission power of the UL transmission.

[0201] Table 6 below shows exemplary factors regarding the PUSCH-to-PTRS power ratio per layer per RE. [Table 6]

[0202] For example, in STxMP SDM transmission (not limited to this mode, of course), layers 1 and 2 are from panel 1, and layers 3 and 4 are from panel 2. When determining the PUSCH-to-PTRS power ratio, the number of PUSCH layers is 2 instead of 4. It can be seen from Table 6 that the ratio should be 3 dB instead of 6 dB. This is only an example, and it should be understood that the present disclosure is not limited thereto.

[0203] Similarly, the terminal device 120 may determine the number of PUSCH layers allocated to panel 125-2 (also referred to as the second PUSCH layer number for convenience in this specification), and based on the second PUSCH layer number, determine the second PUSCH-to-PTRS power ratio per layer for panel 125-2. In some embodiments, the terminal device 120 may determine the second PUSCH-to-PTRS power ratio per layer by searching a table including the mapping between the PUSCH-to-PTRS power ratio per layer for a panel and the number of PUSCH layers associated with the panel. In some embodiments, the terminal device 120 may calculate a value (represented as R') based on formula (10'), and determine the second PUSCH-to-PTRS power ratio per layer by rounding up or down the R' value, or by taking a predetermined number of decimal places for the R' value. The predetermined number may be any suitable positive integer.

[0204] Then, the terminal device 120 may determine the transmission power of the second PTRS transmission via panel 125-2 based on the second PUSCH-to-PTRS power ratio per layer and the transmission power of the UL transmission.

[0205] It is possible to determine the transmission power of the PTRS transmission based on the transmission power for the first PTRS transmission and the transmission power for the second PTRS transmission.

[0206] In some embodiments where cross-panel power limitations are used and power sharing between panels is allowed for simultaneous transmission, one PTRS may be sufficient, and the PUSCH-to-PTRS power ratio per layer may be determined based on the total number of PUSCH layers.

[0207] In some embodiments, instead of the PUSCH-to-PTRS power ratio per RE per layer, the PUSCH-to-PTRS power ratio per RE per panel per layer may be used. In some embodiments, the terminal device 120 may determine the number of PUSCH layers and, based on the number of PUSCH layers, determine the PUSCH-to-PTRS power ratio per RE per panel per layer. Then, the terminal device 120 may determine the transmission power of the PTRS transmission based on the PUSCH-to-PTRS power ratio per RE per panel per layer and the transmission power of the UL transmission.

[0208] In this way, it is possible to accurately determine the PTRS transmission power.

[0209] Returning to FIG. 4, when the transmission power of the UL transmission and the transmission power of the RS transmission are determined, the terminal device 120 may accordingly perform the UL transmission and the RS transmission (440). 4. PHR calculation and reporting

[0210] Continuing to refer to FIG. 4, the terminal device 120 may determine the power headroom (PH) for the UL transmission considering the power consumption of the panel for simultaneous transmission (450). Then, the terminal device 120 may transmit a power headroom report (PHR) to the network device 110 (460). For illustration, some exemplary embodiments will be described with reference to Embodiments 4 to 6. Embodiment 4

[0211] In this embodiment, the PHR may be determined based on actual transmission. Power limit per panel

[0212] In some embodiments where panel - by - panel power limitation is used, for the calculation of two PHs, two threshold powers and two PHs may be provided. In some embodiments, the power limitation includes a first threshold power for panel 125 - 1 and a second threshold power for panel 125 - 2.

[0213] In some embodiments, the terminal device 120 may determine a first PH for panel 125 - 1 based on the first threshold power and the transmission power of the first UL transmission via panel 125 - 1. For example, the first PH may be determined by the following formula (11).

Number

Number

Number

[0214] Similarly, the terminal device 120 may determine a second PH for panel 125 - 2 based on the second threshold power and the transmission power of the second UL transmission via panel 125 - 2. For example, the second PH may be determined by the following formula (12).

Number

Number

Number

[0215] And the terminal device 120 may report the first PH and the second PH. It should be understood that Equations (11) and (12) are merely examples, and any other suitable format is also possible. Cross-panel power limit

[0216] In some embodiments where cross-panel power limiting is used, one threshold power and one or two PHs may be provided for the calculation of one or two PHs for STxMP. In some embodiments, the power limit includes the threshold power for panels 125-1 and 125-2.

[0217] In some embodiments where power sharing is not allowed, the terminal device 120 may determine the scaled threshold power based on the number of panels and the threshold power. The terminal device 120 may determine the first PH for panel 125-1 based on the scaled threshold power and the transmission power of the first UL transmission via panel 125-1. For example, the first PH may be determined by Equation (13) below.

Number

Number

Number

[0218] Similarly, the terminal device 120 may determine a second PH for the panel 125-2 based on the threshold power and the transmission power after scaling of the second UL transmission via the panel 125-2. For example, the second PH may be determined by the following formula (14).

Number

Number

Number

[0219] And the terminal device 120 may report the first PH and the second PH. It should be understood that formulas (13) and (14) are merely examples, and any other appropriate form is also possible.

[0220] In some embodiments where power sharing is allowed, it may be necessary to estimate the total value of the Tx RS from two panels. In some embodiments, the terminal device 120 may determine the PH for the UL transmission based on the threshold power and the sum of the transmission power of the first UL transmission via the panel 125-1 and the transmission power of the second UL transmission via the panel 125-2. For example, the PH may be determined by the following formula (15).

Number

Number

Number

Number

[0221] And the terminal device 120 may report the PH. It should be understood that Equation (15) is only an example, and any other appropriate form is also possible. Embodiment 5

[0222] In this embodiment, the PHR may be determined based on the reference transmission. The assumed Pcmax is

Number

Number

Number

Number

Number

Number

Number

Number

Number

[0223] The transmission power for panel 2 may be calculated based on the following formula (17).

Number

Number

Number

Number

Number

Number

Number

Number

[0224] In some embodiments where power limit per panel is used, for the calculation of two PHs, two threshold powers and two PHs may be provided. In some embodiments, the power limit includes a first threshold power for panel 125-1 and a second threshold power for panel 125-2.

[0225] In some embodiments, the terminal device 120 may determine a first PH for panel 125-1 based on the first threshold power and the transmission power of the first UL transmission via panel 125-1. For example, the first PH may be determined by the following formula (18).

Number

Number

Number

[0226] Similarly, the terminal device 120 may determine a second PH for panel 125-2 based on the second threshold power and the transmission power of the second UL transmission via panel 125-2. For example, the second PH may be determined by the following formula (19).

Number

Number

Number

[0227] And the terminal device 120 may report the first PH and the second PH. It should be understood that Formulas (18) and (19) are merely examples, and any other suitable form is also possible. Cross-panel power limit

[0228] In some embodiments where cross-panel power limiting is used, one threshold power may be provided for the calculation of the two PHs for STxMP, and it may be necessary to estimate the sum of the Tx RS from the two panels. In some embodiments, the power limit includes the threshold power for panels 125-1 and 125-2.

[0229] In some embodiments, the terminal device 120 may determine the PH for the UL transmission based on the threshold power and the sum of the transmission power of the first reference transmission via panel 125-1 and the transmission power of the second reference transmission via panel 125-2. For example, the PH may be determined by the following Formula (20).

Number

Number

Number

Number

[0230] And the terminal device 120 may report the pH. It should be understood that Equation (20) is merely an example, and any other appropriate form is also possible.

[0231] In some embodiments, several assumed values for STxMP may be provided. For example,

Number

Number

Number

Number

Number

Number

[0232] In this embodiment, the conditions for triggering the PHR may be updated.

[0233] In some embodiments, when the change in the path loss estimated value for a panel is higher than a threshold value (for convenience, also referred to as the first threshold value in this specification), the terminal device 120 may transmit a PHR for UL transmission.

[0234] In some embodiments, when the sum of the change in the path loss estimated value for the first panel (e.g., panel 125-1) and the change in the path loss estimated value for the second panel (e.g., panel 125-2) is higher than a threshold value (for convenience, also referred to as the second threshold value in this specification), the terminal device 120 may transmit a PHR for UL transmission.

[0235] In this way, it is possible to report the accurate PH to the network. Example of method

[0236] Accordingly, embodiments of the present disclosure provide communication methods implemented in a terminal device and a network device. Referring to FIGS. 5 to 7, these methods will be described below.

[0237] FIG. 5 is a diagram showing an exemplary communication method 500 implemented in a terminal device according to some embodiments of the present disclosure. For example, method 500 may be executed in the terminal device 120 as shown in FIGS. 1A to 1C. For the sake of explanation, method 500 will be described with reference to FIGS. 1A to 1C. Method 500 may include additional blocks not shown and / or may omit some of the blocks shown, and it should be understood that the scope of the present disclosure is not limited in this regard.

[0238] In block 510, the terminal device 120 receives a first setting for SRS transmission and a second setting for PUSCH transmission.

[0239] In block 520, the terminal device 120 determines whether a first indication indicating an active TCI state and a second indication indicating power control information have been received. If the first and second indications are received, method 500 proceeds to block 530.

[0240] In block 530, the terminal device 120 determines one of the first indication and the second indication for use in power control.

[0241] In block 540, the terminal device 120 determines a first transmission power for the PUSCH transmission based on the first setting and the second setting and one of the first instruction and the second instruction.

[0242] In some embodiments, the first setting includes first information on a TCI state used for power control. In these embodiments, the terminal device 120 may determine the TCI state used for power control based on the first information and the first instruction, and determine a second transmission power for the SRS transmission based on the power control information associated with the TCI state.

[0243] In some embodiments, the first information includes at least one of an identity of the TCI state, an association between an identity of an SRS resource set and an identity of the TCI state, an association between an identity of an SRS resource set and an identity of a TRP or a CORESET or a CORESET group or a search space set, an association between an identity of a TRP or a CORESET or a CORESET group or a search space set and an identity of the TCI state, and a first value of a power control adjustment state indicating the TCI state used for power control.

[0244] In some embodiments, the terminal device 120 does not anticipate different power control settings provided by the first instruction and the second instruction. In some embodiments, the first instruction and the second instruction provide the same power control information. In some embodiments, the first setting includes first information on a TCI state used for power control.

[0245] In some embodiments, the first instruction has a higher priority than the second instruction. In some embodiments, the terminal device 120 may ignore the power control information indicated by the second instruction before the application timing of the power control information indicated by the first instruction. In some embodiments, the terminal device 120 may override the power control information indicated by the second instruction with the power control information indicated by the first instruction before the application timing of the power control information indicated by the second instruction.

[0246] In some embodiments, the second instruction has a higher priority than the first instruction. In some embodiments, the terminal device 120 may ignore the power control information indicated by the first instruction before the application timing of the power control information indicated by the second instruction. In some embodiments, the terminal device 120 may override the power control information indicated by the first instruction with the power control information indicated by the second instruction before the application timing of the power control information indicated by the first instruction.

[0247] In some embodiments, the terminal device 120 may receive second information including at least one of the TCI state used for reference signal power determination or the TCI state used for path loss reference signal determination, and determine a third transmission power for PRACH transmission based on the second information.

[0248] In some embodiments, when the TCI state used for reference signal power determination is associated with a first cell different from the serving cell of the terminal device, the terminal device 120 may obtain the reference signal power from the first cell.

[0249] In some embodiments, when the power control parameter setting is not provided by the TCI state determined based on the first setting, the second setting, and one of the first instruction and the second instruction, the terminal device 120 may determine the power control parameter setting based on at least one of a power control parameter setting associated with a TCI state including the identity of the power control setting, a power control parameter setting having a predetermined identity, or a power control parameter setting applied to a random access procedure within a certain period. In some embodiments, the TCI state including the identity of the power control setting includes at least one of a TCI state applied to a CORESET associated with the PUSCH transmission, a TCI state applied to a CORESET having a predetermined identity, or a TCI state having a predetermined identity.

[0250] In some embodiments, when the path loss reference signal is not provided by the TCI state, the terminal device 120 may determine the path loss reference signal based on at least one of a TCI state including the setting of the path loss reference signal, a predetermined path loss reference signal, or a path loss reference signal applied to a random access procedure within a certain period. In some embodiments, the TCI state including the setting of the path loss reference signal includes at least one of a TCI state applied to a control resource set (CORESET) associated with the PUSCH transmission, a TCI state applied to a CORESET having a predetermined identity, or a TCI state having a predetermined identity. In some embodiments, the predetermined path loss reference signal includes a path loss reference signal having a predetermined identity or a path loss reference signal applied within a certain period.

[0251] FIG. 6 shows an exemplary communication method 600 implemented in a network device according to some embodiments of the present disclosure. For example, method 600 may be executed in a network device 110 (network device 110-1 or 110-2) as shown in FIGS. 1A-1C. For the sake of explanation, method 600 will be described with reference to FIGS. 1A-1C. It should be understood that method 600 may include additional blocks not shown and / or some of the blocks shown may be omitted, and the scope of the present disclosure is not limited in this regard.

[0252] In block 610, the network device 110 transmits a first setting for SRS transmission and a second setting for PUSCH transmission.

[0253] In block 620, the network device 110 transmits a first indication indicating an active TCI state and a second indication indicating power control information.

[0254] In block 630, the network device 110 receives the PUSCH transmission transmitted at the first transmission power determined based on the first setting and the second setting and one of the first indication and the second indication.

[0255] In some embodiments, the first setting includes first information of a TCI state used for power control.

[0256] In some embodiments, the first information includes at least one of an identity of the TCI state, an association between an identity of an SRS resource set and an identity of the TCI state, an association between an identity of an SRS resource set and an identity of a TRP or a CORESET or a CORESET group or a search space set, an association between an identity of a TRP or a CORESET or a CORESET group or a search space set and an identity of the TCI state, and a first value of a power control adjustment state indicating the TCI state used for power control.

[0257] In some embodiments, the network device 110 may transmit second information including at least one of the TCI states used for reference signal power determination or the TCI states used for path loss reference signal determination.

[0258] FIG. 7 shows another exemplary communication method 700 implemented in a terminal device according to some embodiments of the present disclosure. For example, method 700 may be executed in the terminal device 120 as shown in FIGS. 1A-1C. For the sake of explanation, method 700 will be described with reference to FIGS. 1A-1C. It should be understood that method 700 may include additional blocks not shown and / or some of the blocks shown may be omitted, and the scope of the present disclosure is not limited in this regard.

[0259] In block 710, the terminal device 120 in which the first panel and the second panel (e.g., panel 125-1 and panel 125-2) are deployed receives an instruction for simultaneous transmission on the first panel and the second panel.

[0260] In block 720, the terminal device 120 determines a first transmission power for uplink transmission based on at least one power limitation for the first panel and the second panel.

[0261] In block 730, the terminal device 120 determines a second transmission power for reference signal transmission based on the at least one power limitation, the first transmission power, and a ratio of power-related parameters between the uplink transmission and the reference signal transmission, the ratio being determined based on the at least one power limitation.

[0262] In block 740, the terminal device 120 performs the uplink transmission with the first transmission power and the reference signal transmission with the second transmission power.

[0263] In some embodiments where the power limit includes a first threshold power for the first panel and a second threshold power for the second panel, the terminal device 120 may determine the transmission power for the first panel based on the first threshold power, determine the transmission power for the second panel based on the second threshold power, and determine the first transmission power based on the transmission power for the first panel and the transmission power for the second panel.

[0264] In some embodiments where the power limit includes a threshold power, the terminal device 120 may determine a scaled threshold power based on the threshold power divided by the number of panels, determine the transmission power for the first panel based on the scaled threshold power, determine the transmission power for the second panel based on the scaled threshold power, and determine the first transmission power based on the transmission power for the first panel and the transmission power for the second panel.

[0265] In some embodiments where the power limit includes a threshold power, the terminal device 120 may determine the transmission power for the first panel and the transmission power for the second panel. If the sum of the transmission power for the first panel and the transmission power for the second panel is greater than the threshold power, the terminal device 120 may determine the scaled transmission power for the first panel based on the transmission power for the first panel and the ratio of the threshold power to the sum value, and determine the scaled transmission power for the second panel based on the transmission power for the second panel and the ratio of the threshold power to the sum value. Then, the terminal device 120 may determine the first transmission power based on the scaled transmission power for the first panel and the scaled transmission power for the second panel.

[0266] In some embodiments where the reference signal transmission is DMRS transmission, the terminal device 120 determines a first PUSCH-to-DMRS power ratio for the first panel based on the number of DMRS CDM groups without data associated with the first panel, and determines the transmission power for the first DMRS transmission via the first panel based on the transmission power for the first uplink transmission via the first panel and the first PUSCH-to-DMRS power ratio. The terminal device 120 determines a second PUSCH-to-DMRS power ratio for the second panel based on the number of DMRS CDM groups without data associated with the second panel, and determines the transmission power for the second DMRS transmission via the second panel based on the transmission power for the second uplink transmission via the second panel and the second PUSCH-to-DMRS power ratio for the second panel. The second transmission power may be determined based on the transmission power for the first DMRS transmission and the transmission power for the second DMRS transmission.

[0267] In some embodiments where the reference signal transmission is DMRS transmission, the terminal device 120 may determine whether a set of antenna ports in a DMRS CDM group without data and a set of antenna ports for DMRS transmission are associated with the same panel. If the set of antenna ports in the DMRS CDM group without data and the set of antenna ports for DMRS transmission are associated with different panels, the terminal device 120 determines the number of updated DMRS CDM groups without data, determines a PUSCH-to-DMRS power ratio based on the number of updated DMRS CDM groups without data, and may determine the second transmission power based on the first transmission power and the PUSCH-to-DMRS power ratio.

[0268] In some embodiments where the reference signal transmission is DMRS transmission, the number of DMRS CDM groups without data is one.

[0269] In some embodiments where the reference signal transmission is PTRS transmission, the terminal device 120 determines the number of the first PUSCH layers allocated to the first panel and the number of the second PUSCH layers allocated to the second panel, determines a first PUSCH-to-PTRS power ratio per layer for the first panel based on the number of the first PUSCH layers, determines a second PUSCH-to-PTRS power ratio per layer for the second panel based on the number of the second PUSCH layers, determines the transmission power for the first PTRS transmission via the first panel based on the first PUSCH-to-PTRS power ratio per layer and the first transmission power, determines the transmission power for the second PTRS transmission via the second panel based on the second PUSCH-to-PTRS power ratio per layer and the first transmission power, and may determine the second transmission power based on the transmission power for the first PTRS transmission and the transmission power for the second PTRS transmission.

[0270] In some embodiments where the reference signal transmission is PTRS transmission, the terminal device 120 determines the number of the PUSCH layers, determines a PUSCH-to-PTRS power ratio per panel per resource element per layer based on the number of the PUSCH layers, and may determine the second transmission power based on the PUSCH-to-PTRS power ratio per panel per resource element per layer and the first transmission power.

[0271] In some embodiments where the power limit includes a first threshold power for the first panel and a second threshold power for the second panel, the terminal device 120 determines a first power headroom for the first panel based on the first threshold power and the transmission power of the first uplink transmission via the first panel, determines a second power headroom for the second panel based on the second threshold power and the transmission power of the second uplink transmission via the second panel, and may report the first power headroom and the second power headroom.

[0272] In some embodiments where the power limit includes a threshold power, the terminal device 120 determines a scaled threshold power based on the number of the panels and the threshold power, determines a first power headroom for the first panel based on the scaled threshold power and the transmission power of a first uplink transmission via the first panel, determines a second power headroom for the second panel based on the scaled threshold power and the transmission power of a second uplink transmission via the second panel, and may report the first power headroom and the second power headroom.

[0273] In some embodiments where the power limit includes a threshold power, the terminal device 120 determines a power headroom for the uplink transmission based on the threshold power and the sum of the transmission power of a first uplink transmission via the first panel and the transmission power of a second uplink transmission via the second panel, and may report the power headroom.

[0274] In some embodiments where the power limit includes a first threshold power for the first panel and a second threshold power for the second panel, the terminal device 120 determines the transmission power of a first reference transmission via the first panel based on a first set of parameters, determines the transmission power of a second reference transmission via the second panel based on a second set of parameters different from the first set of parameters, determines a first power headroom for the first panel based on the first threshold power and the transmission power of the first reference transmission, determines a second power headroom for the second panel based on the second threshold power and the transmission power of the second reference transmission, and may report the first power headroom and the second power headroom.

[0275] In some embodiments where the power limit includes a threshold power, the terminal device 120 determines the transmission power of a first reference transmission via the first panel based on a first set of parameters, determines the transmission power of a second reference transmission via the second panel based on a second set of parameters different from the first set of parameters, and determines the power headroom for the uplink transmission based on the threshold power and the sum of the transmission power of the first reference transmission and the transmission power of the second uplink transmission, and may report the power headroom.

[0276] In some embodiments, if the change in the path loss estimate for a panel is higher than a first threshold, the terminal device 120 may transmit a power headroom report for the uplink transmission. In some embodiments, if the sum of the change in the path loss estimate for the first panel and the change in the path loss estimate for the second panel is higher than a second threshold, the terminal device 120 may transmit the power headroom report for the uplink transmission.

[0277] FIG. 8 is a schematic block diagram of an apparatus 800 suitable for implementing embodiments of the present disclosure. The apparatus 800 is considered as another exemplary embodiment of the terminal device 120 and the network devices 110-1 and 110-2 shown in FIGS. 1A to 1C. Accordingly, the apparatus 800 may be implemented in or as at least a part of the terminal device 120 and the network devices 110-1 and 110-2.

[0278] As shown, apparatus 800 includes a processor 810, a memory 820 coupled to the processor 810, a suitable transmitter (TX) and receiver (RX) 840 coupled to the processor 810, and a communication interface coupled to the TX / RX 840. The memory 810 stores at least a portion of program 830. The TX / RX 840 is used for two-way communication. The TX / RX 840 has at least one antenna to facilitate communication, although the access nodes referred to herein may actually have multiple antennas. The communication interface may represent any interface necessary for communication with other network elements, such as an X2 interface for two-way communication between eNBs, an S1 interface for communication between a mobility management entity (MME) / serving gateway (S-GW) and an eNB, a Un interface for communication between an eNB and a relay node (RN), or a Uu interface for communication between an eNB and a terminal device.

[0279] It is assumed that program 830 includes program instructions that, when executed by the associated processor 810 as described herein with reference to FIGS. 1A-7, enable apparatus 800 to operate in accordance with embodiments of the present disclosure. Embodiments herein may be implemented by computer software executable by the processor 810 of apparatus 800, or by hardware, or by a combination of software and hardware. The processor 810 may be configured to implement various embodiments of the present disclosure. Further, the combination of the processor 810 and the memory 820 may form processing means 850 suitable for implementing various embodiments of the present disclosure.

[0280] Memory 820 may be of any type suitable for a local technology network and, by way of non-limiting example, may be implemented using any suitable data storage technology such as a non-transitory computer-readable storage medium, a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, a fixed memory, and a removable memory. Although only one memory 820 is shown within device 800, there may be several physically different memory modules within device 800. Processor 810 may be of any type suitable for a local technology network and, by way of non-limiting example, may include one or more of a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 800 may have an application-specific integrated circuit chip that is temporally dependent on a clock that synchronizes multiple processors, such as a main processor.

[0281] In some embodiments, the terminal device includes a circuit that receives a first setting for SRS transmission and a second setting for PUSCH transmission, and determines, according to a determination that a first indication indicating an active TCI state and a second indication indicating power control information have been received, one of the first indication and the second indication for use in power control, and is configured to determine a first transmission power for the PUSCH transmission based on the first setting and the second setting and one of the first indication and the second indication.

[0282] In some embodiments, the network device includes a circuit that transmits a first setting for SRS transmission and a second setting for PUSCH transmission, transmits a first indication indicating an active TCI state and a second indication indicating power control information, and is configured to receive the PUSCH transmission transmitted at the first transmission power determined based on the first setting and the second setting and one of the first indication and the second indication.

[0283] In some embodiments, a terminal device in which a first panel and a second panel are deployed includes a circuit, the circuit receiving an instruction for simultaneous transmission on the first panel and the second panel, determining a first transmission power for uplink transmission based on at least one power limit for the first panel and the second panel, and determining a second transmission power for reference signal transmission based on the at least one power limit, the first transmission power, and a ratio of power-related parameters between the uplink transmission and the reference signal transmission, the ratio being determined based on the at least one power limit, and being set to perform the uplink transmission with the first transmission power and the reference signal transmission with the second transmission power.

[0284] As used herein, the term "circuit" may mean a hardware circuit and / or a combination of a hardware circuit and software. For example, the circuit may be a combination of analog and / or digital hardware circuits and software / firmware. As yet another example, the circuit may be any part of a hardware processor with software, including a digital signal processor, software, and one or more memories, that cooperate to cause a device, such as a terminal device or a network device, to perform various functions. In yet another example, the circuit may be a hardware circuit and / or a processor, such as a microprocessor or a part thereof, that requires software / firmware for operation, but the software may not be present if not required for operation. As used herein, the term "circuit" includes realizations of only a hardware circuit or one or more processors, or a part of a hardware circuit or one or more processors and their (or their) accompanying software and / or firmware.

[0285] As a whole, various embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, and other aspects may be implemented in firmware or software executable by a controller, a microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are illustrated and described using block diagrams, flowcharts, or some other pictorial representation, it should be understood that the blocks, devices, systems, techniques, or methods described herein may be implemented, by way of non-limiting example, in hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or controllers or other computing devices, or any combination thereof.

[0286] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, that are executed within a device on a target physical processor or virtual processor to perform the processes or methods described above with reference to FIGS. 1A-7. Generally, 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 functions of program modules may be combined or divided among program modules as needed. The machine-executable instructions of program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.

[0287] The program code for executing the method of the present disclosure may be described in any combination of one or more programming languages. These program codes are provided to a processor or a controller of a general-purpose computer, a dedicated computer, or other programmable data processing devices, and when executed by the processor or the controller, the program codes implement the functions / operations specified in the flowchart and / or block diagram. The program code may be executed entirely on the machine, partially on the machine, as an independent software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0288] The above program code may be implemented on a machine-readable medium, and the machine-readable medium may be any tangible medium that can be used by or associated with an instruction execution system, apparatus, or device and that can contain or store a program for them. 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 media. More specific examples of the machine-readable storage medium may include an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0289] Although the operations have been described in a particular order, it should be understood that such operations are not required to be performed in the particular order shown or sequentially, nor are all the operations described required to be performed, to obtain a desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to a particular embodiment. Some features described in the context of individual embodiments may be combined and implemented in a single embodiment. Conversely, various features described in the context of a single embodiment may be implemented separately in multiple embodiments or in any suitable sub-combination.

[0290] Although the present disclosure has been described in language specific to structural features and / or methodological operations, it should be understood that the present disclosure as defined in the appended claims is not necessarily limited to the specific features or operations described above. Rather, the specific features and operations described above are disclosed as exemplary forms of implementing the claims.

Claims

1. A method of communication, comprising: in a terminal device in which a first panel and a second panel are deployed, receiving an instruction for simultaneous transmission of the first panel and the second panel; determining a first transmission power for uplink transmission based on at least one power limit for the first panel and the second panel; determining a second transmission power for reference signal transmission based on the at least one power limit, the first transmission power, and a ratio of power-related parameters between the uplink transmission and the reference signal transmission, the ratio being determined based on the at least one power limit; performing the uplink transmission with the first transmission power and performing the reference signal transmission with the second transmission power. A method comprising the above.

2. The power limit includes a first threshold power for the first panel and a second threshold power for the second panel. Determining the first transmission power includes: determining a transmission power for the first panel based on the first threshold power; determining a transmission power for the second panel based on the second threshold power; determining the first transmission power for the uplink transmission based on the transmission power for the first panel and the transmission power for the second panel. The method according to claim 1.

3. The power limit includes a threshold power. Determining the first transmission power includes: determining a scaled threshold power based on the threshold power divided by the number of panels; determining a transmission power for the first panel based on the scaled threshold power; determining a transmission power for the second panel based on the scaled threshold power; determining the first transmission power for the uplink transmission based on the transmission power for the first panel and the transmission power for the second panel. The method according to claim 1.

4. The power limit includes a threshold power. Determining the first transmission power for the uplink transmission includes: determining a transmission power for the first panel; determining a transmission power for the second panel; in accordance with a determination that the sum of the transmission power for the first panel and the transmission power for the second panel is greater than the threshold power. Determine the scaled transmission power for the first panel based on the transmission power for the first panel and the ratio of the threshold power to the total value. Determine the scaled transmission power for the second panel based on the transmission power for the second panel and the ratio of the threshold power to the total value. Determine the first transmission power for the uplink transmission based on the scaled transmission power for the first panel and the scaled transmission power for the second panel. The method according to claim 1.

5. The reference signal transmission is demodulation reference signal (DMRS) transmission, and determining the second transmission power includes: Determine a first PUSCH-to-DMRS power ratio for the first panel based on the number of DMRS code division multiplexing (CDM) groups without data associated with the first panel. Determine the transmission power for the first DMRS transmission via the first panel based on the transmission power for the first uplink transmission via the first panel and the first PUSCH-to-DMRS power ratio. Determine a second PUSCH-to-DMRS power ratio for the second panel based on the number of DMRS CDM groups without data associated with the second panel. Determine the transmission power for the second DMRS transmission via the second panel based on the transmission power for the second uplink transmission via the second panel and the second PUSCH-to-DMRS power ratio for the second panel. Determine the second transmission power based on the transmission power for the first DMRS transmission and the transmission power for the second DMRS transmission. The method according to claim 1.

6. The reference signal transmission is demodulation reference signal (DMRS) transmission, and determining the second transmission power for the reference signal transmission includes: Determining whether one set of antenna ports within a DMRS code division multiplexing (CDM) group without data is associated with the same panel as one set of antenna ports for DMRS transmission; Determining the number of updated DMRS CDM groups without data according to the determination that the one set of antenna ports within the DMRS CDM group without data and the one set of antenna ports for DMRS transmission are associated with different panels; Determining a PUSCH-to-DMRS power ratio based on the number of updated DMRS CDM groups without data; Determining the second transmission power for the reference signal transmission based on the first transmission power for the uplink transmission and the PUSCH-to-DMRS power ratio, including The method according to claim 1.

7. The reference signal transmission is demodulation reference signal (DMRS) transmission, and the number of DMRS code division multiplexing (CDM) groups without data is one The method according to claim 1.

8. The reference signal transmission is phase tracking reference signal (PTRS) transmission, and determining the second transmission power for the reference signal transmission includes Determining a first number of PUSCH layers allocated to the first panel and a second number of PUSCH layers allocated to the second panel; Determining a first PUSCH-to-PTRS power ratio per layer for the first panel based on the first number of PUSCH layers and determining a second PUSCH-to-PTRS power ratio per layer for the second panel based on the second number of PUSCH layers; Determining the transmission power for the first PTRS transmission via the first panel based on the first PUSCH-to-PTRS power ratio per layer and the first transmission power for the uplink transmission; Determining the transmission power for the second PTRS transmission via the second panel based on the second PUSCH-to-PTRS power ratio per layer and the first transmission power for the uplink transmission; determining the second transmission power for the reference signal transmission based on the transmission power for the first PTRS transmission and the transmission power for the second PTRS transmission, The method according to claim 1.

9. The reference signal transmission is phase tracking reference signal (PTRS) transmission, and determining the second transmission power for the reference signal transmission includes: determining the number of PUSCH layers; determining a per-panel PUSCH-to-PTRS power ratio per resource element per layer based on the number of PUSCH layers; determining the second transmission power for the reference signal transmission based on the per-panel PUSCH-to-PTRS power ratio per resource element per layer and the first transmission power for the uplink transmission. The method according to claim 1.

10. The power limit includes a first threshold power for the first panel and a second threshold power for the second panel, and the method includes: determining a first power headroom for the first panel based on the first threshold power and the transmission power of a first uplink transmission via the first panel; determining a second power headroom for the second panel based on the second threshold power and the transmission power of a second uplink transmission via the second panel; reporting the first power headroom and the second power headroom. The method according to claim 1, further comprising.

11. The power limit includes a threshold power, and the method includes: determining a scaled threshold power based on the number of panels and the threshold power; determining a first power headroom for the first panel based on the scaled threshold power and the transmission power of a first uplink transmission via the first panel; determining a second power headroom for the second panel based on the scaled threshold power and the transmission power of a second uplink transmission via the second panel; reporting the first power headroom and the second power headroom. The method according to claim 1, further comprising.

12. The power limit includes a threshold power, and the method includes: Determining power headroom for the uplink transmission based on the threshold power and the sum of the transmission power of the first uplink transmission via the first panel and the transmission power of the second uplink transmission via the second panel; Reporting the power headroom; The method according to claim 1, further comprising.

13. The power limit includes a first threshold power for the first panel and a second threshold power for the second panel, and the method includes: Determining the transmission power of a first reference transmission via the first panel based on a first set of parameters, and determining the transmission power of a second reference transmission via the second panel based on a second set of parameters different from the first set of parameters; Determining a first power headroom for the first panel based on the first threshold power and the transmission power of the first reference transmission; Determining a second power headroom for the second panel based on the second threshold power and the transmission power of the second reference transmission; Reporting the first power headroom and the second power headroom; The method according to claim 1, further comprising.

14. The power limit includes a threshold power, and the method includes: Determining the transmission power of a first reference transmission via the first panel based on a first set of parameters, and determining the transmission power of a second reference transmission via the second panel based on a second set of parameters different from the first set of parameters; Determining power headroom for the uplink transmission based on the threshold power and the sum of the transmission power of the first reference transmission and the transmission power of the second uplink transmission; Reporting the power headroom; The method according to claim 1, further comprising.

15. Transmitting a power headroom report for the uplink transmission according to a determination that a change in the path loss estimate for the panel is higher than a first threshold, or Transmitting a power headroom report for the uplink transmission according to a determination that the sum of the change in the path loss estimate for the first panel and the change in the path loss estimate for the second panel is higher than a second threshold; The method according to claim 1, further comprising.

16. A communication device comprising a processor configured to execute the method according to any one of claims 1 to 15 .

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