EP4732601A1

EP4732601A1 - Device and method of communication

Info

Publication number: EP4732601A1
Application number: EP23941900.5A
Authority: EP
Inventors: Peng Guan; Yukai GAO; Gang Wang
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 2023-06-20
Filing date: 2023-06-20
Publication date: 2026-04-29
Also published as: WO2024259594A1; CN121533100A

Abstract

Embodiments of the present disclosure relate to device and method of communication. A terminal device determines a beam set for STxMP. Based on information of the beam set, the terminal device determines power limitation information for the STxMP and performs the STxMP based on the power limitation information. In this way, suitable UL PC for STxMP may be achieved.

Description

DEVICE AND METHOD OF COMMUNICATION

TECHNICAL FIELD

Example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to method, device, and computer readable medium of communication for uplink (UL) power control (PC) for simultaneous transmission across multi-panels (STxMP) .

BACKGROUND

Currently, two power limitation assumptions for STxMP have been discussed, i.e., a power limitation per panel for STxMP and a total power limitation per user equipment (UE) over all UE panels used for STxMP. However, how to perform UL PC for STxMP in these scenarios is still unclear.

SUMMARY

In general, example embodiments of the present disclosure provide a method, device and computer storage medium of communication for UL PC for STxMP.
In a first aspect, there is provided a terminal device. The terminal device comprises a processor configured to cause the terminal device to: determine a beam set for simultaneous transmission across panels; determine, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and perform the simultaneous transmission across the panels based on the power limitation information.
In a second aspect, there is provided a method of communication. The method comprises: determining, at a terminal device, a beam set for simultaneous transmission across panels; determining, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and performing the simultaneous transmission across the panels based on the power limitation information.
In a third aspect, there is provided a computer readable medium having instructions stored thereon. The instructions, when executed on at least one processor, cause the at least one processor to perform the method according to the second aspect of the present disclosure.
It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

Through the more detailed description of some embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein:
Fig. 1A illustrates an example communication network in which embodiments of the present disclosure can be implemented;
Fig. 1B illustrates another example communication network in which embodiments of the present disclosure can be implemented;
Fig. 1C illustrates still another example communication network in which embodiments of the present disclosure can be implemented;
Fig. 2 illustrates a schematic diagram illustrating examples of a beam set for panels in which embodiments of the present disclosure can be implemented;
Fig. 3 illustrates a schematic diagram illustrating a process of communication according to some example embodiments of the present disclosure;
Fig. 4 illustrates a schematic diagram illustrating an example power headroom report (PHR) medium access control (MAC) control element (CE) according to some example embodiments of the present disclosure;
Fig. 5 illustrates a flowchart of an example method performed by a terminal device in accordance with some embodiments of the present disclosure; and
Fig. 6 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
Throughout the drawings, the same or similar reference numerals represent the same or similar element.

DETAILED DESCRIPTION

Principle of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.
In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
As used herein, the term ‘terminal device’ refers to any device having wireless or wired communication capabilities. Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, 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, device on vehicle for 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 duplex in commercial networks, reduced capability (RedCap) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eXtended Reality (XR) devices including different types of realities such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) , the unmanned aerial vehicle (UAV) commonly known as a drone which is an aircraft without any human pilot, devices on high speed train (HST) , or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. The ‘terminal device’ can further has ‘multicast/broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4/IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporated one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM. The term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
The term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , Network-controlled Repeaters, and the like.
The terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
The terminal or the network device may work on several frequency ranges, e.g. FR1 (410 MHz to 7125 MHz) , FR2 (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum. The terminal device may have more than one connection with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario. The terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
The network device may have the function of network energy saving, Self-Organizing Networks (SON) /Minimization of Drive Tests (MDT) . The terminal may have the function of power saving.
The embodiments of the present disclosure may be performed in test equipment, e.g. signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator.
The embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
In one embodiment, the terminal device may be connected with 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 one 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 eNB and the second RAT device is gNB. Information related with different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In one embodiment, first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device. In one embodiment, information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device. Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
As used herein, the singular forms ‘a’ , ‘an’ and ‘the’ are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term ‘includes’ and its variants are to be read as open terms that mean ‘includes, but is not limited to. ’ The term ‘based on’ is to be read as ‘at least in part based on. ’ The term ‘one embodiment’ and ‘an embodiment’ are to be read as ‘at least one embodiment. ’ The term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’ The terms ‘first, ’ ‘second, ’ and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
In some examples, values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
As known, UE can configure its maximum output power. The configured UE maximum output power P_CMAX, f, c for carrier f of a serving cell c may be defined as that available to the reference point of a given transmitter branch that corresponds to the reference point of the higher-layer filtered reference signal receiving power (RSRP) measurement. The configured UE maximum output power P_CMAX, f, c for carrier f of a serving cell c shall be set such that the corresponding measured peak EIRP P_UMAX, f, c is within the following bounds in equation (1) :
P_Powerclass + DP_IBE –MAX (MAX (MPR_f, c, A-MPR_f, c, ) + ΔMB_P, n, P-MPR_f, c) –MAX {T (MAX (MPR_f, c, A-MPR_f, c, ) ) , T (P-MPR_f, c) } ≤ P_UMAX, f, c ≤ EIRP_max (1)
while the corresponding measured total radiated power P_TMAX, f, c is bounded by equation (2)
P_TMAX, f, c ≤ TRP_max (2)
where P_Powerclass denotes the UE minimum peak effective isotropic radiated power (EIRP) , EIRP_max denotes the applicable maximum EIRP, MPR_f, c denotes maximum output power reduction for carrier f of serving cell c, A-MPR_f, c denotes additional maximum output power reduction for carrier f of serving cell c, ΔMB_P, n denotes the peak EIRP relaxation, P-MPR_f, _c denotes the power management UE maximum power reduction for carrier f of serving cell c, T (ΔP) denotes the tolerance T (ΔP) for applicable values of ΔP, and TRP_max denotes the maximum TRP for the UE power class. DP_IBE is 1.0 dB if UE declares support for mpr-PowerBoost-FR2-r16, UL transmission is QPSK, MPR_f,c = 0 and when NS_200 applies and the network configures the UE to operate with mpr-PowerBoost-FR2-r16 otherwise DP_IBE is 0.0 dB. The requirement is verified in beam peak direction. mpr-PowerBoost-FR2-r16 indicates whether UE is allowed to boost uplink transmission power by suspending in-band emission (IBE) requirements.
It has been agreed that a power limitation per panel and a total power limitation per UE for STxMP should be applied to a same UE. Variations among beams of different panels transmitted simultaneously may be larger or smaller, and thus UE maximum output power per panel may be different, even if EIRP requirement is the same for each panel.
In view of this, embodiments of the present disclosure provide a solution of communication for UL PC so as to overcome the above or other potential issues. In the solution, a terminal device determines a beam set for STxMP. Based on information of the beam set, the terminal device determines power limitation information for the STxMP and performs the STxMP based on the power limitation information. In this way, suitable UL PC for STxMP may be achieved. Transmission power may be guaranteed as high as possible while requirement on maximum EIRP is met, and thus quality of UL transmission may be ensured.
Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
In the present disclosure, some terms may refer to same or similar physical meaning and may be used interchangeably. Some exemplary examples are listed as below.
· The terms “port (s) used for a uplink transmission” , “port (s) used for a physical uplink shared channel (PUSCH) transmission” , “port (s) with non-zero PUSCH transmission power” and “port (s) with non-zero uplink transmission power” can be used interchangeably;
· The terms “panel (s) used for a uplink transmission” , “panel (s) used for a PUSCH transmission” , “panel (s) with non-zero PUSCH transmission power” and “panel (s) with non-zero uplink transmission power” can be used interchangeably;
· The terms “transmission capability information” , “UE capability information” , “capability-related information” , “capability value set” , “panel information” and “panel-related information” can be used interchangeably;
· The terms “precoder” , “precoding” , “precoding matrix” , “beam” , “spatial relation information” , “spatial relation info” , “precoding information” , “precoding information and number of layers” , “precoding matrix indicator (PMI) ” , “precoding matrix indicator” , “transmission precoding matrix indication” , “precoding matrix indication” , “transmission configuration indicator (TCI) state” , “transmission configuration indicator” , “quasi co-location (QCL) ” , “quasi-co-location” , “QCL parameter” , “QCL assumption” , “QCL relationship” and “spatial relation” can be used interchangeably;
· The terms “single TRP” , “single TCI state” , “single TCI” , “S-TCI” , “single control resource set (CORESET) ” , “single CORESET pool” , “S-TRP” and “S-TCI state” can be used interchangeably;
· The terms “multiple TRPs” , “multiple TCI states” , “multiple CORESETs” and “multiple control resource set pools” , “multi-TRP” , “multi-TCI state” , “multi-TCI” , “multi-CORESET” and “multi-control resource set pool” , “multiple transmission reception point (MTRP) ” and “M-TCI” , “M-TPR” can be used interchangeably;
· The terms “resource (s) ” , “resource (s) in a resource set” , “resource set” can be used interchangeably;
· The terms “group” , “subset” , “set” can be used interchangeably;
· One panel discussed herein refers to one or more antenna elements deployed at a certain area of a terminal device. A panel discussed herein can refer to downlink panel, uplink panel, panel type, panel status, capability value set, reference signal (RS) resource, RS resource set, antenna port, antenna port group, beam, beam group. In this regard, the terms (and their equivalent expressions) “panel” , “panel type” , “set of antenna port (s) ” , “antenna element (s) ” , “antenna array (s) ” can be used interchangeably.
· Panel information discussed herein may refer to UE panel index/identification (ID) , downlink panel ID, uplink panel ID, panel type indication, panel status indication, capability value set index, RS resource ID, RS resource set ID, antenna port ID, antenna port group ID, beam ID, beam group ID. The term “per panel” may be interchangeably used with “per capability value index” , “per capability value set index” , “per RF Chain” , “per transmit (Tx) RF Chain” , “per branch” , “per Tx branch” , etc.
· As used herein, the term “TRP” refers to an antenna array (with one or more antenna elements) available to the network device located at a specific geographical location. Although some embodiments of the present disclosure are described with reference to a scenario of multi-TRPs (or a scenario of single TRP) for example, these embodiments are only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the present disclosure. It is to be understood that the present disclosure described herein can be implemented in various manners other than the ones described below.
· As used herein, the term “sounding reference signal (SRS) transmission” refers to a transmission of SRS resource identified by SRS signal resource indicator (SRI) in a downlink control information (DCI) message for uplink grant. Accordingly, term “the latest SRS transmission” refers to the latest transmission of SRS resource identified by SRI in a DCI message for uplink grant.
· As used herein, the term “network” / “network device (s) ” refer to one or more network devices. Accordingly, terms “network” , “network device (s) ” and “one or more network devices” can be used interchangeably.
· “Panel with lower capability” can be used interchangeably with “panel with higher capability” , “panel corresponds to lower/higher capability value set index” , “panel used most recently” , “old panel used in initial access/least PRACH” , “panel used in initial access/least PRACH” and so on. In other words, it can be any pre-defined rule known at both network (NW) and UE side, or signaled by NW/UE to each other by configuration/capability reporting/request.
· “band-width part (BWP) ID/index” can be used interchangeably with “BWP/component carrier (CC) ID/index” , “CC identity/index” , “cell identity/index” ” , “physical cell identity/index” and “serving cell identity/index” .
· Uplink (UL) beam, spatial relation, spatial Tx, spatial domain filter, RS, resource and TCI state may refer to the same thing. UL beam (or UL beam ID) and downlink (DL) beam (or DL beam ID) may or may not have beam correspondence. UL beam (or UL beam ID) may be determined from measurement of DL RS. UL beam or UL beam ID may be reflected as RS ID, resource ID, beam ID, and so on. UL beam pair may refer to a group of UL beams (more than 2) , or, beams generated by different panels, or beams towards different TRPs. The term “beam” may also be interchangeably used with “set of QCL parameters” , “QCL type” , “QCL typeD” , “spatial reception parameter” , “spatial domain parameter” , “spatial domain transmission filter” , “spatial domain receiving filter” , “spatial receiving parameter” or “spatial relation information.
· Panel or panel ID may be replaced by capability index. The term “panel” may also be interchangeably used with “DL panel” , “UL panel” , “panel type” , “panel status” , “capability value set” , “RS resource” , “RS resource set” , “antenna port” , “antenna port group” , “beam” , or “beam group” . The term “panel ID” may also be interchangeably used with “DL panel ID” , “UL panel ID” , “panel type indication” , “panel status indication” , “capability value set index” , “RS resource ID” , “RS resource set ID” , “antenna port ID” , “antenna port group ID” , “beam ID” or “beam group ID” . The term “per panel” may also be interchangeably used with “per capability value [set] index” , “per [Tx] RF Chain” , “per [Tx] branch” , etc..
· MTRP TCI state for UL may be joint TCI state or UL TCI state. MTRP TCI state for UL may be 1 indicated joint TCI state + 1 indicated joint TCI state. MTRP TCI state for UL may be 1 pair of indicated DL and UL TCI states + 1 pair of indicated DL and UL TCI states. A unified TCI state as used herein may refer to a pair of DL and UL TCI states.
· For pathloss (PL) RS and PL estimation, pathloss for active UL BWP b of carrier f is based on the PL RS on the active DL BWP of serving cell c and calculated by UE in dB as referenceSignalPower –higher layer filtered RSRP in dBm. If the UE is not configured with periodic channel state information (CSI) -RS reception, referenceSignalPower is provided by ss-PBCH-BlockPower. If the UE is not configured with periodic CSI-RS reception, referenceSignalPower is provided either by ss-PBCH-BlockPower or by powerControlOffsetSS providing an offset of the CSI-RS transmission power relative to the SS/PBCH block transmission power. If powerControlOffsetSS is not provided to the UE, the UE assumes an offset of 0 dB.
· The term “for STxMP” may include “for STxMP spatial division multiplexing (SDM) ” and “for STxMP single frequency network (SFN) ” respectively. Other STxMP schemes are not excluded, including STxMP repetition, STxMP frequency division multiplexing (FDM) , etc..
· The term “for STxMP” may include “for STxMP PUSCH” and “for STxMP physical uplink control channel (PUCCH) ” respectively. Other channels/signals or combinations of channels/signals are not excluded, including like PRACH, SRS, PUSCH+PUCCH.
· The term “for STxMP” may include “for single-DCI based STxMP” and “for multiple-DCI based STxMP” respectively.
· The term “for STxMP” may include “for dynamic grant (DG) /configured grant (CG) STxMP” and “for DG/CG + DG/CG STxMP” respectively.
EXAMPLE OF COMMUNICATION ENVIRONMENT
Fig. 1A illustrates an example communication network 100A in which embodiments of the present disclosure can be implemented. The communication network 100A includes a network device 110-1 and an optionally network device 110-2 (collectively or individually referred to as network devices 110) . The network device 110 can provide services to a terminal device 120. For purpose of discussion, the network device 110-1 is referred to as the first network device 110-1, and the 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 can communicate with each other.
In the communication network 100A, a link from the network devices 110 (such as, a first network device 110-1 or the second network device 110-2) to the terminal device 120 is referred to as a downlink, while a link from the terminal device 120 to the network devices 110 (such as, a first network device 110-1 or the second network device 110-2) is referred to as an uplink. In downlink, the first network device 110-1 or the second network device 110-2 is a Tx device (or a transmitter) and the terminal device 120 is a receiving (Rx) device (or a receiver) . In uplink, the terminal device 120 is a transmitting Tx device (or a transmitter) and the first network device 110-1 or the second network device 110-2 is a Rx device (or a receiver) .
In some embodiments, the network device (s) 110 and the terminal device 120 may communicate with direct links/channels.
In some embodiments, the terminal device 120 may be deployed with more than one panel. As illustrated in Fig. 1A, the terminal device 120 is deployed with panels 125-1 and 125-2. In the following, the panels 125-1 and 125-2 may be referred to as the first panel 125-1 and the second panel 125-2, respectively.
In some embodiments, the first panel 125-1 and the second panel 125-2 correspond to different sets of antenna port (s) /antenna element (s) /antenna array (s) . 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 correspond to different capability value sets, respectively. In some embodiments, the panels 125-1 and 125-2 may correspond to different RS resource sets, respectively. In some embodiments, the RS resource sets may be SRS resource sets. Each resource set may comprise one or more resources.
In the communication network 100A, a PUSCH STxMP may be supported. Specifically, the terminal device 120 may perform a PUSCH over both of the panels 125-1 and 125-2 simultaneously.
In some embodiments, a MTRP transmission may also be supported. As illustrated in Fig. 1A, the terminal device 120 may communicate with two TRPs, i.e., the TRPs 130-1 and 130-2 (collectively or individually referred to as TRP 130) . For purpose of discussion, the TRP 130-1 is referred to as the first TRP 130-1, and the TRP 130-2 is referred to as the second TRP 130-2.
In addition, in order to support MTRP and/or multi-panel, the network device 110 may be equipped with one or more TRPs. For example, the network device 110 may be coupled with multiple TRPs in different geographical locations to achieve better coverage. In one specific example embodiment, the first network device 110-1 is equipped with the first TRP 130-1 and the second TRP 130-2. Alternatively, in another specific example embodiment, the first network device 110-1 and the second network device 110-2 are equipped with the first TRP 130-1 and the second 130-2, respectively.
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 while the second TRP 130-2 is associated with a second control resource set pool.
Further, both a single TRP mode transmission and MTRP transmission may be supported by the specific example of Fig. 1A. Specifically, in case of the single TRP mode, the terminal device 120 communicates with the network via the first TRP 130-1/second TRP 130-2. Alternatively, in case of the MTRP mode, the terminal device 120 communicates with the network via both of the first TRP 130-1 and the second TRP 130-2.
As one specific example embodiment, during a PUSCH STxMP, the terminal device 120 communicates with the first TRP 130-1 via the panel 125-1 and communicates with the second TRP 130-2 via the panel 125-2 simultaneously.
Further, the network device (s) 110 may provide one or more serving cells and the first TRP 130-1 and the second TRP 130-2 may be included in a same serving cell or different serving cells. In other words, both an inter-cell transmission and an intra-cell transmission are supported by the specific example of Fig. 1A.
Fig. 1B shows an example scenario of the communication network 100A as 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 a same serving cell 140. In this event, the MTRP transmission is performed as an intra-cell transmission.
Fig. 1C shows another example scenario of the communication network 100A as 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 event, the MTRP transmission is performed as an inter-cell transmission.
The communications in the communication network 100A may conform to any suitable standards including, but not limited to, Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like. Furthermore, the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , 5.5G, 5G-Advanced networks, or the sixth generation (6G) communication protocols.
It is to be understood that the numbers of elements (i.e., the terminal device 120, the panel 125, the network device 110, the TRP 130 and the cell 140) and their connection relationships and types shown in Figs. 1A to 1C are only for purpose of illustration without suggesting any limitation. The communication network 100A may include any suitable numbers of elements adapted for implementing embodiments of the present disclosure.
In some scenarios, panels may be beamforming to the same or similar direction. In some scenarios, the panels may be beamforming to different directions. Fig. 2 illustrates a schematic diagram 200 illustrating examples of a beam set for panels in which embodiments of the present disclosure can be implemented. As shown by an example 210 in Fig. 2, directions of beam 1 of panel 1 and beam 2 of panel 2 are nearly opposite. As shown by an example 220 in Fig. 2, directions of beam 1 of panel 1 and beam 2 of panel 2 are similar.
EIRP is defined per UE, instead of per panel. EIRP measured in case that two panels are beamforming to the same or similar direction may be higher than EIRP measured in case that the two panels are beamforming to different directions. In other words, maximum output power per panel may be different. For example, in the example 210, higher maximum output power per panel or beam may be assumed. In the example 220, lower maximum output power per panel or beam may be assumed.
In view of this, embodiments of the present disclosure provide a solution of communication for UL PC so as to optimize UL PC for STxMP. The solution will be described below with reference to Figs. 3 and 4.
EXAMPLE IMPLEMENTATION OF UL PC FOR STXMP
Fig. 3 illustrates a schematic diagram illustrating a process 300 of communication according to some example embodiments of the present disclosure. For the purpose of discussion, the process will be described with reference to Figs. 1A to 1C.
The process 300 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 may involve the TRPs 130 (including the first TRP 130-1 and the second TRP 130-2) . In other words, the implementations of some embodiments do not depend on the TRPs 130. The terminal device 120 may be deployed with the first panel 125-1 and the second panel 125-2. Further, the first panel 125-1 corresponds to a first set of antenna ports and the second panel 125-2 corresponds to a second set of antenna ports.
Additionally, the first TRP 130-1 is connected to the first network device 110-1, while the second TRP 130-2 is connected to the first network device 110-1/second network device 110-2. In addition, the first TRP 130-1 and the second TRP may be in a same serving cell or in different serving cells.
In the following text, although some embodiments of the present disclosure are described with reference to two TRPs and two panels, these embodiments are only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the present disclosure. It is to be understood that the present disclosure described herein can be implemented in various manners other than the ones described below.
Further, it is to be understood that the operations at 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 common understanding about configuration, parameter and so on. Such common understanding may be implemented by any suitable interactions between the network device 110 and the terminal device 120 or both the network device 110 and the terminal device 120 applying the same rule/policy. In the following, although some operations are described from a perspective of the terminal device 120, it is to be understood that the corresponding operations should be performed by the network device 110. Similarly, although some operations are described from a perspective of the network device 110, it is to be understood that the corresponding operations should be performed by the terminal device 120. Merely for brevity, some of the same or similar contents are omitted here.
In addition, in the following description, some interactions are performed among the terminal device 120 and the network device 110 (such as, exchanging capability-related information, configuring/scheduling/activating resource/transmission and so on) . It is to be understood that the interactions may be implemented either in one single signaling/message or multiple signaling/messages, including system information, a radio resource control (RRC) message, DCI, uplink control information (UCI) , a MAC CE and so on. The present disclosure is not limited in this regard.
In some embodiments, the one or more interaction may be specific to a particular panel, a TRP, a capability value, a CORESET and so on. In this way, the PUSCH STxMP may be configured or activated flexibly.
Moreover, it should be understood that although feature (s) /operation (s) are discussed in specific example embodiments separately, unless clearly indicated to the contrary, these feature (s) /operation (s) described in different example embodiments may be used in any suitable combination.
With reference to Fig. 3, the terminal device 120 may transfer 310 information of UE capability with the network device 110. For example, the network device 110 may transmit, to the terminal device 120, an RRC configuration regarding UE capability reporting. The terminal device 120 may report capability of the terminal device 120 to the network device 110 based on the RRC configuration.
In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports power limitation information for a beam. In some embodiments, the power limitation information may indicate maximum output power. In some embodiments, the power limitation information may indicate maximum power reduction (MPR) . In some embodiments, the power limitation information may indicate maximum permitted emission (MPE) . It is to be understood that any combination of these information may also be feasible.
In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports maximum output power (denoted as Pcmax) per panel or beam. For example, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports Pcmax1 for the panel 125-1 and Pcmax2 for the panel 125-2 for calculating Tx power of the terminal device 120. E.g., whether P_{CMAX, f, c, t} may be assumed, where t denotes a panel/beam. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports determining the power limitation information for a beam in the beam set based on number of beams in the beam set (i.e., the number of panels) and reference power limitation information (e.g., P_CMAX, f, c) . E.g., whether 1/N P_CMAX, f, c is assumed per panel, where N denotes the number of panels used for transmission. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports determining the power limitation information for a beam in the beam set based on reference power limitation information (e.g., P_CMAX, f, c) and a scaling factor for the beam. E.g., whether beta1*P_CMAX, f, c and beta2*P_CMAX, f, c are assumed for panel 1 and panel 2 respectively, where beta1 denotes a scaling factor for beam 1 of panel 1, and beta2 denotes a scaling factor for beam 2 of panel 2. In some embodiments, the sum of beta1*P_CMAX, f, c and beta2*P_CMAX, f, c may be larger than or equal to P_CMAX, f, c.
In other words, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports Pcmax per beam or per TCI. Alternatively, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports more than one Pcmax for STxMP. Alternatively, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports a number of Pcmax for STxMP.
In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports power limitation information dedicated for STxMP. For example, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports additional Pcmax for STxMP. That is, for UL multi-input multi-output (MIMO) transmission over a single panel, P_CMAX, f, c may be assumed. If UL STxMP is used, additional Pcmax (e.g., P_{CMAX, f, c, STxMP}) may be assumed. In some embodiments, P_{CMAX, f, c, STxMP} may be applied for total power of all panels used for STxMP. In some embodiments, P_{CMAX, f, c, STxMP} may be applied for each panel used for STxMP.
In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports same power limitation information for STxMP and a transmission across a single panel. For example, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports the same Pcmax for STxMP and other single panel UL transmission. E. g., for calculating Tx power of the terminal device 120, P_CMAX, f, c may be assumed regardless of UL schemes.
In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports MPR per UE or per beam or per panel. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports MPE per UE or per beam or per panel. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports additional MPR for STxMP. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports additional MPE for STxMP. In some embodiments, the additional MPE for STxMP may be applied for total power reduction of all panels used for STxMP. In some embodiments, the additional MPE for STxMP may be applied for the power reduction of each panel used for STxMP. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports the same MPR for STxMP and other single panel UL transmission. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports the same MPE for STxMP and other single panel UL transmission.
Based on the capability of the terminal device 120, the network device 110 may configure one or more of Pcmax assumption, MPR assumption and MPE assumption applied at the terminal device 120.
In some embodiments, the capability of the terminal device 120 may comprise information about a reporting of the power limitation information. In some embodiments, information of whether the terminal device 120 supports a CSI report comprising the power limitation information. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports a reporting of the power limitation information in association with a set of SRIs. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports a reporting of the power limitation information in association with a set of TCI states. In some embodiments, the capability of the terminal device 120 may comprise information of whether the terminal device 120 supports a PHR comprising the power limitation information for STxMP. It is to be understood that any combination of the above capabilities may also be feasible.
Continuing to refer to Fig. 3, the network device 110 may transmit 320, to the terminal device 120, an indication for enabling STxMP. For the STxMP, the terminal device 120 may determine 330 a beam set for the STxMP, i.e., a set of beams corresponding to panels of the terminal device 120 to be transmitted simultaneously. In some embodiments, the terminal device 120 may receive a set of DL RSs from the network device 110. Based on measurement on the set of DL RSs, the terminal device 120 may determine the beam set for STxMP.
In some embodiments, the terminal device 120 may transmit a set of UL RSs to the network device 110. The network device 110 may measure the set of UL RSs and determine the beam set for STxMP based on results of the measurement. The network device 110 may indicate the beam set to the terminal device 120. Accordingly, the terminal device 120 may determine the beam set based on the indication from the network device 110.
Continuing to refer to Fig. 3, the terminal device 120 may determine 340 power limitation information for the STxMP based on information of the beam set. In some embodiments, the information of the beam set may comprise directions of beams in the beam set. In some embodiments, the information of the beam set may comprise gain of beams in the beam set. In some embodiments, the information of the beam set may comprise widths of beams in the beam set. In some embodiments, the information of the beam set may comprise RSRP or pathloss corresponding to beams in the beam set. It is to be understood that any combination of the above information is also feasible.
Based on the information of the beam set, the terminal device 120 may determine suitable power limitation information for the STxMP. In some embodiments, the terminal device 120 may determine power limitation information per beam or panel for the STxMP. For example, if the beam set comprises a first beam and a second beam, the terminal device 120 may determine first power limitation information for the first beam and second power limitation information for the second beam, e.g., the terminal device 120 may assume P_{CMAX, f, c, t}, where t denotes a panel/beam.
In some embodiments, the terminal device 120 may determine reference power limitation information (e.g., P_CMAX, f, c) for the terminal device 120, and determine the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information. For example, the terminal device 120 may determine 1/N P_CMAX, f, c as the maximum output power for each panel, where N denotes the number of beams.
In some embodiments, the terminal device 120 may determine reference power limitation information (e.g., P_CMAX, f, c) for the terminal device 120, and determine the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam. For example, the terminal device 120 may determine beta1*P_CMAX, f, c and beta2*P_CMAX, f, c as the maximum output power for panel 1 and panel 2, where beta1 denotes a scaling factor for beam 1 of panel 1, and beta2 denotes a scaling factor for beam 2 of panel 2.
In some embodiments, the terminal device 120 may determine power limitation information dedicated for the STxMP as the power limitation information for the beam set. For example, the terminal device 120 may determine P_{CMAX, f, c, STxMP} as a total maximum output power for all beams in the beam set. In some alternative embodiments, P_{CMAX, f, c, STxMP} may be applied for each panel used for STxMP.
In some embodiments, the terminal device 120 may determine same power limitation information for STxMP and a transmission across a single panel. In some embodiments, the terminal device 120 may determine reference power limitation information (e.g., P_CMAX, f, c) for the terminal device 120, and determine the reference power limitation information as the power limitation information for a beam (e.g., each beam) in the beam set.
Continuing to refer to Fig. 3, the terminal device 120 may perform 350 the STxMP based on the determined power limitation information. In some embodiments where two panels are used for STxMP, the terminal device 120 may determine first Tx power of a first channel or RS based on the determined power limitation information, and determine second Tx power of a second channel or RS based on the determined power limitation information and the first Tx power. The terminal device 120 may simultaneously transmit the first channel or RS with the first Tx power and the second channel or RS with the second Tx power.
Continuing to refer to Fig. 3, the terminal device 120 may transmit 360 the determined power limitation information to the network device 110. In this way, the terminal device 120 may report power limitation information for STxMP to a network. In some embodiments, the reporting of the power limitation information may be before the STxMP is performed. In some embodiments, the reporting of the power limitation information may be after the STxMP is performed.
In some embodiments, the terminal device 120 may transmit capability of the terminal device 120 comprising the power limitation information. In other words, the terminal device 120 may transmit the power limitation information in UE capability reporting. For example, as the power limitation information associated with the maximum output power, depending on different Pcmax assumptions, P_{CMAX, f, c, t}, N, scaling factors, or P_{CMAX, f, c, STxMP} may be reported.
In some embodiments, the terminal device 120 may transmit the power limitation information in a CSI report. In this way, power limitation information for STxMP may be reported in a more dynamic way. Depending on selection of UL beams, power limitation information (e.g., the maximum output power assumption) may be different.
In some embodiments, the network device 110 may configure beam reporting quantity and resources for beam measurement and report, and the terminal device 120 may transmit the power limitation information in the CSI report based on the configuration. In some embodiments, the terminal device 120 may report information of the beam set and information of the power limitation information for the beam set. The reporting may be in different granularities.
For example, Pcmax is assumed per UE. In this case, the terminal device 120 may report information of whether beams in the beam set can be transmitted simultaneously via the same Pcmax or not. For example, the information may be indicated via 1-bit or 2-bit indicator. In this way, a high-level reporting may be achieved. In another example, scaling factors (e.g., beta1, beta2, etc. ) for beams in the beam set may be reported. In this way, a reporting with finer granularity may be achieved.
In some embodiments, the terminal device 120 may transmit a group based beam report comprising the power limitation information. In some embodiments, the network device 110 may configure the group based beam report for STxMP so as to report the power limitation information. In some embodiments, based on capability of the terminal device 120, the network device 110 may configure whether reported DL RSs corresponding to beams in the beam set can be received simultaneously.
In some embodiments, the group based beam report may comprise an indicator of the power limitation information. In some embodiments, the indicator may be per resource group. In some embodiments, the power limitation information may be associated with the beam set. For example, an example group based beam report may be configured as in Table 1.
Table 1
In the context of the present disclosure, it is assumed that the beam set for STxMP corresponds to CRI/SSBRI #1 and #2. It is to be understood that reporting four resource groups is merely an example and the number of resource groups may be any suitable numbers depending on a configuration from the network.
As shown in Table 1, the field “Indicator of 1^st resource group” indicates power limitation information for CRI/SSBRI #1 and #2 of 1^st resource group. The field “Indicator of 2^nd resource group” indicates power limitation information for CRI/SSBRI #1 and #2 of 2^nd resource group. The field “Indicator of 3^rd resource group” indicates power limitation information for CRI/SSBRI #1 and #2 of 3^rd resource group. The field “Indicator of 4^th resource group” indicates power limitation information for CRI/SSBRI #1 and #2 of 4^th resource group.
In some embodiments, the power limitation information may be associated with beams in the beam set. For example, an example group based beam report may be configured as in Table 2.
Table 2
As shown in Table 2, the field “Indicator of CRI/SSBRI #1 of 1^st resource group” indicates power limitation information for CRI/SSBRI #1 of 1^st resource group. The field “Indicator of CRI/SSBRI #2 of 1^st resource group” indicates power limitation information for CRI/SSBRI #2 of 1^st resource group. The field “Indicator of CRI/SSBRI #1 of 2^nd resource group” indicates power limitation information for CRI/SSBRI #1 of 2^nd resource group. The field “Indicator of CRI/SSBRI #2 of 2^nd resource group” indicates power limitation information for CRI/SSBRI #2 of 2^nd resource group. The field “Indicator of CRI/SSBRI #1 of 3^rd resource group” indicates power limitation information for CRI/SSBRI #1 of 3^rd resource group. The field “Indicator of CRI/SSBRI #2 of 3^rd resource group” indicates power limitation information for CRI/SSBRI #2 of 3^rd resource group. The field “Indicator of CRI/SSBRI #1 of 4^th resource group” indicates power limitation information for CRI/SSBRI #1 of 4^th resource group. The field “Indicator of CRI/SSBRI #2 of 4^th resource group” indicates power limitation information for CRI/SSBRI #2 of 4^th resource group.
In some alternative or additional embodiments, the indicator may be per group based beam report, not per resource group. In some alternative or additional embodiments, the scaling factors may also be reported per beam (i.e., per CRI/SSBRI) .
In some alternative or additional embodiments, a bit length of the indictor of the power limitation information may depend on the number of assumptions supported. For example, 1-bit per resource group if only two of maximum power assumptions supported.
In some embodiments, if a group based beam report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may not be reported, since it is for indicating UL beam pairs. In this way, signaling overhead may be saved.
In some embodiments, if a group based beam report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may be replaced with path loss and differential path loss information. In this way, signaling overhead may be saved.
In some embodiments, if a group based beam report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may be replaced with Pcmax information. In this way, signaling overhead may be saved.
It is to be noted that although the above example is described in connection with a RSRP report, the present disclosure is not limited to this and a signal to interference plus noise ratio (SINR) report is also feasible.
In some embodiments, the terminal device 120 may transmit a panel information report (i.e., a capability index report) comprising the power limitation information. In some embodiments, the network device 110 may configure the capability index report for STxMP so as to report the power limitation information. In some embodiments, based on capability of the terminal device 120, the network device 110 may configure whether reported DL RSs corresponding to different capability index can be received simultaneously.
In some embodiments, the capability index report may comprise an indicator of the power limitation information. In some embodiments, the indicator may be per beam set (i.e., per panel) . In some embodiments, the power limitation information may be associated with the panels. For example, an example capability index report may be configured as in Table 3.
Table 3
As shown in Table 3, the field “Indicator of 1^st set” indicates power limitation information for beam set 1 of panel 1. The beam set 1 includes a beam of panel 1 and a beam of panel 2. The field “Indicator of 2^nd set” indicates power limitation information for beam set 2 of panel 2. The beam set 2 includes a beam of panel 1 and a beam of panel 2. It is to be noted that a set of UL beams corresponding to different capability indexes may be transmitted simultaneously.
In some embodiments, the power limitation information may be associated with beams of the panels. For example, an example capability index report may be configured as in Table 4.
Table 4
As shown in Table 4, the field “Indicator of CRI/SSBRI #1” indicates power limitation information for CRI/SSBRI #1. The field “Indicator of CRI/SSBRI #2” indicates power limitation information for CRI/SSBRI #2. The field “Indicator of CRI/SSBRI #3” indicates power limitation information for CRI/SSBRI #3. The field “Indicator of CRI/SSBRI #4” indicates power limitation information for CRI/SSBRI #4.
In some alternative or additional embodiments, the indicator may be per capability index report, not per beam set. In some alternative or additional embodiments, the scaling factors may also be reported per beam (i.e., per CRI/SSBRI) .
In some alternative or additional embodiments, a bit length of the indicator of the power limitation information may depend on the number of assumptions supported. For example, 1-bit per beam set if only two of maximum power assumptions supported.
In some embodiments, if a capability index report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may not be reported, since it is for indicating UL beam pairs. In this way, signaling overhead may be saved.
In some embodiments, if a capability index report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may be replaced with path loss and different path loss information. In this way, signaling overhead may be saved.
In some embodiments, if a capability index report is configured for reporting UL beam pairs for STxMP, RSRP and differential RSRP related information may be replaced with Pcmax information. In this way, signaling overhead may be saved.
It is to be noted that although the above example is described in connection with a RSRP report, the present disclosure is not limited to this and a SINR report is also feasible.
In some embodiments, the terminal device 120 may transmit the power limitation information associated with a set of SRIs (i.e., a SRI combination) . The set of SRI corresponds to the beam set for STxMP. In other words, based on transmitted SRS, the terminal device 120 may report supported SRI combination and associated power limitation information for STxMP.
In some embodiments, the power limitation information associated with the set of SRIs may be transmitted via an RRC signaling. In some embodiments, the power limitation information associated with the set of SRIs may be transmitted via a MAC CE. In some embodiments, the power limitation information associated with the set of SRIs may be transmitted via UCI. In some embodiments, the scaling factors of beams in the beam set may also be reported.
In some embodiments, for one power assumption, supported SRI combinations may be reported. For example, SRI combinations may be {SRS resource set 1 SRS resource 1, SRS resource set 2 SRS resource 2} ; {SRS resource set 1 SRS resource 3, SRS resource set 2 SRS resource 4} ; same Pcmax. That is, UL beams corresponding to SRI 1/3 from SRS resource set 1 and SRI 2/4 from SRS resource set 2 can be used for STxMP and the maximum output power for each beam is Pcmax.
Alternatively or additionally, the terminal device 120 may transmit the power limitation information unassociated with a further set of SRIs. In other words, for one power assumption, SRI combinations not supported may be reported.
In some embodiments, for one SRI combination, supported power assumptions may be reported. Alternatively or additionally, for one SRI combination, power assumptions not supported may be reported.
In some embodiments, the terminal device 120 may transmit the power limitation information associated with a set of TCI states. In other words, based on activated or configured TCI states/TCI state combinations, the terminal device 120 may report a set of TCI states (i.e., a TCI state combination) and associated power limitation information for STxMP. In this way, configured or activated TCI states/TCI state combinations may reflect NW selection of UL beam combinations, and the terminal device 120 may further select or report power assumptions for part or all of those UL beam combinations.
In some embodiments, the power limitation information associated with the set of TCI states may be transmitted via an RRC signaling. In some embodiments, the power limitation information associated with the set of TCI states may be transmitted via a MAC CE. In some embodiments, the power limitation information associated with the set of TCI states may be transmitted via UCI. In some embodiments, the scaling factors of beams in the beam set may also be reported.
In some embodiments, for one power assumption, supported TCI state combinations may be reported. For example, TCI state combinations may be {TCI state 1, TCI state 2} ; {TCI state 3, TCI state 4} ; same Pcmax. That is, UL beams corresponding to TCI state 1/3 and TCI state 2/4 can be used for STxMP and the maximum output power for each beam is Pcmax. In another example, TCI state combinations may be TCI code point 000; TCI code point 001; same Pcmax. That is, UL beams corresponding to TCI code point 000 and 001 can be used for STxMP and the maximum output power for each beam is Pcmax. In another example, TCI state combinations may be the first activated TCI state combinations in MAC CE; same Pcmax. That is, UL beams corresponding to the first activated TCI state combinations in MAC CE can be used for STxMP and the maximum output power for each beam is Pcmax.
Alternatively or additionally, the terminal device 120 may transmit the power limitation information unassociated with a further set of TCI states. In other words, for one power assumption, TCI state combinations not supported may be reported.
In some embodiments, for one TCI state combination, supported power assumptions may be reported. Alternatively or additionally, for one TCI state combination, power assumptions not supported may be reported.
In some embodiments, the terminal device 120 may transmit a PHR comprising the power limitation information for STxMP. For example, the terminal device 120 may report Pcmax and MPR per panel/beam or per UE in a PHR. As power headroom is based on actual transmission or reference transmission, thus the power headroom may better reflect UE-side situation.
Fig. 4 illustrates a schematic diagram 400 illustrating an example PHR MAC CE according to some example embodiments of the present disclosure. A single entry PHR MAC CE is shown for illustration. It is to be understood that single entry PHR is merely an example, and the present disclosure may also apply to multiple entry PHR, enhanced single entry PHR, enhanced multiple entry PHR, enhanced single entry PHR for multiple TRP, or enhanced multiple entry PHR for multiple TRP.
As shown in Fig. 4, R field indicates reserved bit set to 0. PH field indicates the power headroom level. P field indicates that if mpe-Reporting-FR2 is configured and the Serving Cell operates on FR2, the MAC entity shall set this field to 0 if the applied P-MPR value, to meet MPE requirements, is less than P-MPR_00 and to 1 otherwise. If mpe-Reporting-FR2 is not configured or the Serving Cell operates on FR1, the P field indicates whether power backoff is applied due to power management. The MAC entity shall set the P field to 1 if the corresponding P_CMAX, f, c field would have had a different value if no power backoff due to power management had been applied. P_CMAX, f, c field indicates the P_CMAX, f, c used for calculation of the preceding PH field. MPE field indicates the applied power backoff to meet MPE requirements if mpe-Reporting-FR2 is configured, and the Serving Cell operates on FR2, and if the P field is set to 1. If mpe-Reporting-FR2 is not configured, or if the Serving Cell operates on FR1, or if the P field is set to 0, R bits are present instead. mpe-Reporting-FR2 indicates whether the UE shall report MPE P-MPR in the PHR MAC CE.
As shown in Fig. 4, the field 401 may indicate power assumption (e.g., maximum output power) for STxMP. In some embodiments, if the terminal device 120 supports per panel/beam Pcmax for STxMP, the field 401 may indicate P_{CMAX, f, c, t}, where t corresponds to a panel/beam. In some embodiments, if the terminal device 120 supports additional Pcmax for STxMP, the field 401 may indicate P_{CMAX, f, c, STxMP}. In some embodiments, if the terminal device 120 supports the same Pcmax for STxMP and other single panel UL transmission, the field 401 may indicate P_CMAX, f, c.
As shown in Fig. 4, the field 402 may indicate MPR/MPE for STxMP. In some embodiments, if the terminal device 120 supports per panel/beam MPR/MPE for STxMP, the field 402 may indicate MPE_t, where t corresponds to a panel/beam. MPE_t indicates the applied power backoff to meet MPE requirements for a panel/beam. In addition, the information about applied panel/beam/beam set may be reported. In some embodiments, if the terminal device 120 supports additional MPR/MPE for STxMP, the field 402 may indicate MPE_STxMP. MPE_STxMP indicates the applied power backoff to meet MPE requirements for STxMP. MPE_STxMP may be an absolute value or an accumulated value. In some embodiments, if the terminal device 120 supports the same Pcmax for STxMP and other single panel UL transmission, the field 402 may indicate MPE. MPE_STxMP is for the total power reduction of all panels used for STxMP. In some embodiments, the additional MPE for STxMP may be for the power reduction of each panel used for STxMP. In some embodiments, information of whether MPE_STxMP is for the total power reduction of all panels used for STxMP or each panel used for STxMP may be reported or configured.
In some embodiments, if a condition for triggering the PHR is satisfied for at least one beam in the beam set, the terminal device 120 may transmit the PHR comprising the power limitation information. In some embodiments, if a condition for triggering the PHR is satisfied for one beam in the beam set, the terminal device 120 may transmit the PHR. In some embodiments, if a condition for triggering the PHR is satisfied for all the beams in the beam set, the terminal device 120 may transmit the PHR.
For example, the condition for triggering the PHR may be that per panel/beam, or for all panel/beam, the measured periodic-MPR (P-MPR) applied to meet FR2 MPE requirements is equal to or larger than mpe-Threshold for at least one activated FR2 Serving Cell since the last transmission of a PHR in the MAC entity. mpe-Threshold indicates a threshold in dB for reporting MPE P-MPR when FR2 is configured. In another example, the condition for triggering the PHR may be that per panel/beam, or for all panel/beam, the measured P-MPR applied to meet FR2 MPE requirements has changed more than phr-Tx-PowerFactorChange dB for at least one activated FR2 Serving Cell since the last transmission of a PHR due to the MPR issue. phr-Tx-PowerFactorChange indicates value in dB for PHR reporting. Value dB1 corresponds to 1 dB, dB3 corresponds to 3 dB and so on..
In some embodiments, based on capability of the terminal device 120, the network device 110 may configure one or more Pcmax assumption or MPR assumption applied at the terminal device 120. The terminal device 120 may generate the PHR based on the configuration.
So far, a solution of UC PC for STxMP is described. With the process 300, suitable UL PC for STxMP may be achieved. Transmission power may be guaranteed as high as possible while requirement on maximum EIRP is met, and thus quality of UL transmission may be ensured. It is to be understood that operations described in the process 300 may be carried out in any suitable orders and combination, the present disclosure does not limit this aspect.
EXAMPLE IMPLEMENTATION OF METHOD
Accordingly, embodiments of the present disclosure provide a method of communication implemented at a terminal device. The method will be described below with reference to Fig. 5.
Fig. 5 illustrates an example method 500 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure. For example, the method 500 may be performed at the terminal device 120 as shown in Figs. 1A to 1C. It is to be understood that the method 500 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
At block 510, the terminal device 120 determines a beam set for STxMP.
At block 520, the terminal device 120 determines, based on information of the beam set, power limitation information for the STxMP. In some embodiments, the information of the beam set may comprise at least one of the following: directions of beams in the beam set; gain of beams in the beam set; or widths of beams in the beam set.
In some embodiments where the beam set comprises a first beam and a second beam, the terminal device 120 may determine first power limitation information for the first beam and second power limitation information for the second beam.
In some embodiments, the terminal device 120 may determine reference power limitation information for the terminal device 120 and determine the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information.
In some embodiments, the terminal device 120 may determine reference power limitation information for the terminal device and determine the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam.
In some embodiments, the terminal device 120 may determine, as the power limitation information for the beam set, power limitation information dedicated for the simultaneous transmission across the panels.
In some embodiments, the terminal device 120 may determine reference power limitation information for the terminal device 120 and determine the reference power limitation information as the power limitation information for a beam in the beam set.
At block 530, the terminal device 120 performs the STxMP based on the power limitation information.
In some embodiments, the terminal device 120 may transmit, to the network device 110, capability of the terminal device 120. The capability of the terminal device 120 may comprise at least one of the following: information of whether the terminal device 120 supports power limitation information for a beam; information of whether the terminal device 120 supports power limitation information dedicated for the STxMP; information of whether the terminal device 120 supports same power limitation information for the STxMP and transmission across a single panel; information of whether the terminal device 120 supports a CSI report comprising the power limitation information; information of whether the terminal device 120 supports a reporting of the power limitation information in association with a set of SRIs; information of whether the terminal device 120 supports a reporting of the power limitation information in association with a set of TCI states; or information of whether the terminal device 120 supports a PHR comprising the power limitation information.
In some embodiments, the terminal device 120 may transmit the power limitation information to the network device 110. In some embodiments, the terminal device 120 may transmit capability of the terminal device 120 comprising the power limitation information.
In some embodiments, the terminal device 120 may transmit a group based beam report comprising the power limitation information associated with the beam set or beams in the beam set. In some embodiments, the terminal device 120 may transmit a panel information report comprising the power limitation information associated with the panels or beams of the panels.
In some embodiments, the terminal device 120 may transmit the power limitation information associated with a set of SRIs. In some embodiments, the terminal device 120 may transmit the power limitation information unassociated with a further set of SRIs.
In some embodiments, the terminal device 120 may transmit the power limitation information associated with a set of TCI states. In some embodiments, the terminal device 120 may transmit the power limitation information unassociated with a further set of TCI states.
In some embodiments, the terminal device 120 may transmit a PHR comprising the power limitation information. In some embodiments, if a condition for triggering the power headroom report is satisfied for at least one beam in the beam set, the terminal device 120 may transmit the PHR comprising the power limitation information.
With the method 500, a suitable UL PC for STxMP may be carried out. Transmission power may be guaranteed as high as possible while requirement on maximum EIRP is met, and thus quality of UL transmission may be ensured. It is to be understood that operations of the method 500 correspond to the process described in connection with Figs. 3 and 4, and thus other details are omitted here for conciseness.
EXAMPLE IMPLEMENTATION OF DEVICE
Fig. 6 is a simplified block diagram of a device 600 that is suitable for implementing embodiments of the present disclosure. The device 600 can be considered as a further example implementation of the terminal device 120 or the network device 110 as shown in Figs. 1A to 1C. Accordingly, the device 600 can be implemented at or as at least a part of the terminal device 120 or the network device 110.
As shown, the device 600 includes a processor 610, a memory 620 coupled to the processor 610, a suitable transceiver 640 coupled to the processor 610, and a communication interface coupled to the transceiver 640. The memory 610 stores at least a part of a program 630. The transceiver 640 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 640 may include at least one of a transmitter 642 or a receiver 644. The transmitter 642 and the receiver 644 may be functional modules or physical entities. The transceiver 640 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2/Xn interface for bidirectional communications between eNBs/gNBs, S1/NG interface for communication between a Mobility Management Entity (MME) /Access and Mobility Management Function (AMF) /SGW/UPF and the eNB/gNB, Un interface for communication between the eNB/gNB and a relay node (RN) , or Uu interface for communication between the eNB/gNB and a terminal device.
The program 630 is assumed to include program instructions that, when executed by the associated processor 610, enable the device 600 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Figs. 1A to 5. The embodiments herein may be implemented by computer software executable by the processor 610 of the device 600, or by hardware, or by a combination of software and hardware. The processor 610 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 610 and memory 620 may form processing means 650 adapted to implement various embodiments of the present disclosure.
The memory 620 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 620 is shown in the device 600, there may be several physically distinct memory modules in the device 600. The processor 610 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 600 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
In some embodiments, a terminal device comprises a circuitry configured to: determine a beam set for simultaneous transmission across panels; determine, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and perform the simultaneous transmission across the panels based on the power limitation information.
The term “circuitry” used herein may refer to hardware circuits and/or combinations of hardware circuits and software. For example, the circuitry may be a combination of analog and/or digital hardware circuits with software/firmware. As a further example, the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions. In a still further example, the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software/firmware for operation, but the software may not be present when it is not needed for operation. As used herein, the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and/or firmware.
In summary, embodiments of the present disclosure provide the following solutions.
In one solution, a terminal device comprises: a processor configured to cause the terminal device to: determine a beam set for simultaneous transmission across panels; determine, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and perform the simultaneous transmission across the panels based on the power limitation information.
In some embodiments, the information of the beam set comprises at least one of the following: directions of beams in the beam set; gain of beams in the beam set; or widths of beams in the beam set.
In some embodiments, the beam set comprises a first beam and a second beam, and the terminal device is caused to determine the power limitation information by: determining first power limitation information for the first beam; and determining second power limitation information for the second beam.
In some embodiments, the terminal device is caused to determine the power limitation information by: determining reference power limitation information for the terminal device; and determining the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information.
In some embodiments, the terminal device is caused to determine the power limitation information by: determining reference power limitation information for the terminal device; and determining the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam.
In some embodiments, the terminal device is caused to determine the power limitation information by: determining, as the power limitation information for the beam set, power limitation information dedicated for the simultaneous transmission across the panels.
In some embodiments, the terminal device is caused to determine the power limitation information by: determining reference power limitation information for the terminal device; and determining the reference power limitation information as the power limitation information for a beam in the beam set.
In some embodiments, the terminal device is further caused to: transmit, to a network device, capability of the terminal device comprising at least one of the following: information of whether the terminal device supports power limitation information for a beam; information of whether the terminal device supports power limitation information dedicated for the simultaneous transmission across the panels; information of whether the terminal device supports same power limitation information for the simultaneous transmission across the panels and transmission across a single panel; information of whether the terminal device supports a channel state information report comprising the power limitation information; information of whether the terminal device supports a reporting of the power limitation information in association with a set of sounding reference signal resource indicators; information of whether the terminal device supports a reporting of the power limitation information in association with a set of transmission configuration indicator states; or information of whether the terminal device supports a power headroom report comprising the power limitation information.
In some embodiments, the terminal device is further caused to: transmit the power limitation information to a network device.
In some embodiments, the terminal device is caused to transmit the power limitation information by at least one of the following: transmitting capability of the terminal device comprising the power limitation information; transmitting a group based beam report comprising the power limitation information associated with the beam set or beams in the beam set; transmitting a panel information report comprising the power limitation information associated with the panels or beams of the panels; transmitting the power limitation information associated with a set of sounding reference signal resource indicators; transmitting the power limitation information unassociated with a further set of sounding reference signal resource indicators; transmitting the power limitation information associated with a set of transmission configuration indicator states; transmitting the power limitation information unassociated with a further set of transmission configuration indicator states; or transmitting a power headroom report comprising the power limitation information.
In some embodiments, the terminal device is caused to transmit the power headroom report by: in accordance with a determination that a condition for triggering the power headroom report is satisfied for at least one beam in the beam set, transmitting the power headroom report comprising the power limitation information.
In some embodiments, the power limitation information indicates at least one of the following: maximum output power; maximum power reduction; or maximum permitted emission.
In another solution, a method of communication comprises: determining, at a terminal device, a beam set for simultaneous transmission across panels; determining, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and performing the simultaneous transmission across the panels based on the power limitation information.
In some embodiments, the information of the beam set comprises at least one of the following: directions of beams in the beam set; gain of beams in the beam set; or widths of beams in the beam set.
In some embodiments, the beam set comprises a first beam and a second beam, and determining the power limitation information comprises: determining first power limitation information for the first beam; and determining second power limitation information for the second beam.
In some embodiments, determining the power limitation information comprises: determining reference power limitation information for the terminal device; and determining the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information.
In some embodiments, determining the power limitation information comprises: determining reference power limitation information for the terminal device; and determining the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam.
In some embodiments, determining the power limitation information comprises: determining, as the power limitation information for the beam set, power limitation information dedicated for the simultaneous transmission across the panels.
In some embodiments, determining the power limitation information comprises: determining reference power limitation information for the terminal device; and determining the reference power limitation information as the power limitation information for a beam in the beam set.
In some embodiments, the method further comprises: transmitting, to a network device, capability of the terminal device comprising at least one of the following: information of whether the terminal device supports power limitation information for a beam; information of whether the terminal device supports power limitation information dedicated for the simultaneous transmission across the panels; information of whether the terminal device supports same power limitation information for the simultaneous transmission across the panels and transmission across a single panel; information of whether the terminal device supports a channel state information report comprising the power limitation information; information of whether the terminal device supports a reporting of the power limitation information in association with a set of sounding reference signal resource indicators; information of whether the terminal device supports a reporting of the power limitation information in association with a set of transmission configuration indicator states; or information of whether the terminal device supports a power headroom report comprising the power limitation information.
In some embodiments, the method further comprises: transmitting the power limitation information to a network device.
In some embodiments, transmitting the power limitation information comprises at least one of the following: transmitting capability of the terminal device comprising the power limitation information; transmitting a group based beam report comprising the power limitation information associated with the beam set or beams in the beam set; transmitting a panel information report comprising the power limitation information associated with the panels or beams of the panels; transmitting the power limitation information associated with a set of sounding reference signal resource indicators; transmitting the power limitation information unassociated with a further set of sounding reference signal resource indicators; transmitting the power limitation information associated with a set of transmission configuration indicator states; transmitting the power limitation information unassociated with a further set of transmission configuration indicator states; or transmitting a power headroom report comprising the power limitation information.
In some embodiments, transmitting the power headroom report comprises: in accordance with a determination that a condition for triggering the power headroom report is satisfied for at least one beam in the beam set, transmitting the power headroom report comprising the power limitation information.
In some embodiments, the power limitation information indicates at least one of the following: maximum output power; maximum power reduction; or maximum permitted emission.
Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
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 those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to Figs. 1A to 5. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for 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.
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, 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 particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
Although the present disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

A terminal device, comprising:

a processor configured to cause the terminal device to:

determine a beam set for simultaneous transmission across panels;

determine, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and

perform the simultaneous transmission across the panels based on the power limitation information.
The terminal device of claim 1, wherein the information of the beam set comprises at least one of the following:

directions of beams in the beam set;

gain of beams in the beam set; or

widths of beams in the beam set.
The terminal device of claim 1, wherein the beam set comprises a first beam and a second beam, and the terminal device is caused to determine the power limitation information by:

determining first power limitation information for the first beam; and

determining second power limitation information for the second beam.
The terminal device of claim 1, wherein the terminal device is caused to determine the power limitation information by:

determining reference power limitation information for the terminal device; and

determining the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information.
The terminal device of claim 1, wherein the terminal device is caused to determine the power limitation information by:

determining reference power limitation information for the terminal device; and

determining the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam.
The terminal device of claim 1, wherein the terminal device is caused to determine the power limitation information by:

determining, as the power limitation information for the beam set, power limitation information dedicated for the simultaneous transmission across the panels.
The terminal device of claim 1, wherein the terminal device is caused to determine the power limitation information by:

determining reference power limitation information for the terminal device; and

determining the reference power limitation information as the power limitation information for a beam in the beam set.
The terminal device of claim 1, wherein the terminal device is further caused to:

transmit, to a network device, capability of the terminal device comprising at least one of the following:

information of whether the terminal device supports power limitation information for a beam;

information of whether the terminal device supports power limitation information dedicated for the simultaneous transmission across the panels;

information of whether the terminal device supports same power limitation information for the simultaneous transmission across the panels and transmission across a single panel;

information of whether the terminal device supports a channel state information report comprising the power limitation information;

information of whether the terminal device supports a reporting of the power limitation information in association with a set of sounding reference signal resource indicators;

information of whether the terminal device supports a reporting of the power limitation information in association with a set of transmission configuration indicator states; or

information of whether the terminal device supports a power headroom report comprising the power limitation information.
The terminal device of claim 1, wherein the terminal device is further caused to:

transmit the power limitation information to a network device.
The terminal device of claim 9, wherein the terminal device is caused to transmit the power limitation information by at least one of the following:

transmitting capability of the terminal device comprising the power limitation information;

transmitting a group based beam report comprising the power limitation information associated with the beam set or beams in the beam set;

transmitting a panel information report comprising the power limitation information associated with the panels or beams of the panels;

transmitting the power limitation information associated with a set of sounding reference signal resource indicators;

transmitting the power limitation information unassociated with a further set of sounding reference signal resource indicators;

transmitting the power limitation information associated with a set of transmission configuration indicator states;

transmitting the power limitation information unassociated with a further set of transmission configuration indicator states; or

transmitting a power headroom report comprising the power limitation information.
The terminal device of claim 10, wherein the terminal device is caused to transmit the power headroom report by:

in accordance with a determination that a condition for triggering the power headroom report is satisfied for at least one beam in the beam set, transmitting the power headroom report comprising the power limitation information.
The terminal device of claim 1, wherein the power limitation information indicates at least one of the following:

maximum output power;

maximum power reduction; or

maximum permitted emission.
A method of communication, comprising:

determining, at a terminal device, a beam set for simultaneous transmission across panels;

determining, based on information of the beam set, power limitation information for the simultaneous transmission across the panels; and

performing the simultaneous transmission across the panels based on the power limitation information.
The method of claim 13, wherein determining the power limitation information comprises:

determining reference power limitation information for the terminal device; and

determining the power limitation information for a beam in the beam set based on number of beams in the beam set and the reference power limitation information.
The method of claim 13, wherein determining the power limitation information comprises:

determining reference power limitation information for the terminal device; and

determining the power limitation information for a beam in the beam set based on the reference power limitation information and a scaling factor for the beam.
The method of claim 13, wherein determining the power limitation information comprises:

determining, as the power limitation information for the beam set, power limitation information dedicated for the simultaneous transmission across the panels.
The method of claim 13, wherein determining the power limitation information comprises:

determining reference power limitation information for the terminal device; and

determining the reference power limitation information as the power limitation information for a beam in the beam set.
The method of claim 13, further comprising:

transmitting, to a network device, capability of the terminal device comprising at least one of the following:

information of whether the terminal device supports power limitation information for a beam;

information of whether the terminal device supports power limitation information dedicated for the simultaneous transmission across the panels;

information of whether the terminal device supports same power limitation information for the simultaneous transmission across the panels and transmission across a single panel;

information of whether the terminal device supports a channel state information report comprising the power limitation information;

information of whether the terminal device supports a reporting of the power limitation information in association with a set of sounding reference signal resource indicators;

information of whether the terminal device supports a reporting of the power limitation information in association with a set of transmission configuration indicator states; or

information of whether the terminal device supports a power headroom report comprising the power limitation information.
The method of claim 13, further comprising:

transmitting the power limitation information to a network device.
The method of claim 19, wherein transmitting the power limitation information comprises at least one of the following:

transmitting capability of the terminal device comprising the power limitation information;

transmitting a group based beam report comprising the power limitation information associated with the beam set or beams in the beam set;

transmitting a panel information report comprising the power limitation information associated with the panels or beams of the panels;

transmitting the power limitation information associated with a set of sounding reference signal resource indicators;

transmitting the power limitation information unassociated with a further set of sounding reference signal resource indicators;

transmitting the power limitation information associated with a set of transmission configuration indicator states;

transmitting the power limitation information unassociated with a further set of transmission configuration indicator states; or

transmitting a power headroom report comprising the power limitation information.