Patent Publication Number: US-2023141329-A1

Title: Method and apparatus for power control of pusch repetition

Description:
TECHNICAL FIELD 
     Embodiments of the present disclosure generally relate to wireless communication technology, especially to a method and apparatus for power control of physical uplink shared channel (PUSCH) repetition. 
     BACKGROUND 
     There is a work item description (WID) approved on multiple-input multiple-output (MIMO) in New Radio (NR) Release 17 (R17) which includes a research topic, that is, identifying and specifying features to improve reliability and robustness for channels other than physical downlink shared channel (PDSCH) (that is, physical downlink control channel (PDCCH), PUSCH, and physical uplink control channel (PUCCH)) using multi-transmit-receive point (TRP) and/or multi-panel, with Release 16 (R16) reliability features as the baseline. 
     In some existing procedures, in order to improve reliability and robustness, a same PUSCH transmission may be repeatedly transmitted for several times. PUSCH repetitions of a PUSCH transmission with multiple beams/TRPs in multiple slots can utilize a spatial diversity of multiple beams/TRPs to increase the reliability and robustness, which will be studied and discussed in NR R17. Considering the PUSCH repetitions of the PUSCH transmission by using multiple beams may be received by multiple TRPs of a base station (BS), power control of the PUSCH repetitions should be different due to different links between a user equipment (UE) and different TRPs. Therefore, the power control of each PUSCH repetition with a different beam corresponding to a different TRP reception should be separately controlled and enhanced. 
     SUMMARY OF THE APPLICATION 
     Some embodiments of the present disclosure provide a method. The method may include receiving a mapping pattern and a configuration of a plurality of power control parameter sets for a physical uplink shared channel (PUSCH) transmission, which is configured to be transmitted in a plurality of time intervals repeatedly; receiving a downlink control information (DCI) for scheduling the PUSCH transmission, wherein the DCI includes a sounding reference signal resource indicator (SRI) field; determining a power of each PUSCH repetition of the PUSCH transmission based on at least one SRI value in the SRI field, the configuration of the plurality of power control parameter sets and the mapping pattern; and transmitting the PUSCH transmission in the plurality of time intervals repeatedly based on the determined power of each PUSCH repetition of the PUSCH transmission and the mapping pattern. 
     In an embodiment of the present application, each of the plurality of the power control parameter sets includes at least one of a power offset, a compensation factor, a pathloss reference RS, and a closed loop index. 
     In an embodiment of the present application, in the case of a plurality of SRI values being in the SRI field, each of the plurality of SRI values indicates a sounding reference signal (SRS) resource for codebook based transmission or an SRS resource subset for non-codebook based transmission. 
     In an embodiment of the present application, the configuration of the plurality of power control parameter sets includes a plurality of SRI-PUSCH-PowerControl lists, and each of the SRI-PUSCH-PowerControl lists includes at least one power control parameter set, and wherein a number of the SRI-PUSCH-PowerControl lists is the same as a number of the SRI values. 
     In an embodiment of the present application, the plurality of SRI-PUSCH-PowerControl lists include a first SRI-PUSCH-PowerControl list and a second SRI-PUSCH-PowerControl list, and the plurality of SRI values include a first SRI value and a second SRI value, and a first power control parameter set is indicated by mapping the first SRI value to the first SRI-PUSCH-PowerControl list and a second power control parameter set is indicated by mapping the second SRI value to the second SRI-PUSCH-PowerControl list. 
     In an embodiment of the present application, the DCI further includes a transmission power control (TPC) command field indicating at least one TPC command of at least one closed loop index respectively. 
     In an embodiment of the present application, the at least one TPC command includes a first TPC command and a second TPC command, the at least one closed loop index includes a first closed loop index and a second closed loop index, and the first TPC command corresponds to the first closed loop index and the second TPC command corresponds to the second closed loop index. 
     In an embodiment of the present application, the first power control parameter set and the second power parameter set are associated with the first TPC command and the second TPC command respectively, and the first closed loop index and the second closed loop index are included in the first power parameter set and the second power parameter set respectively. 
     In an embodiment of the present application, the mapping pattern indicates said each PUSCH repetition which the SRS resource for codebook based transmission or the SRS resource subset for non-codebook based transmission is associated with. 
     In an embodiment of the present application, determining the power of said each PUSCH repetition of the PUSCH transmission further includes: determining the power of each PUSCH repetition of the PUSCH transmission based on the power control parameter set associated with the SRI value which is associated with said each PUSCH repetition and a corresponding TPC command of the first TPC command and the second TPC command. 
     In another embodiment of the present disclosure, in the case of one SRI value being in the SRI field, and the SRI value indicates a plurality of SRS resources for codebook based transmission or a plurality of SRS resource subsets for non-codebook based transmission. 
     In another embodiment of the present disclosure, the SRI value further maps to one SRI-PUSCH-PowerControl list, and the configuration of the plurality of power control parameter sets includes the SRI-PUSCH-PowerControl list, wherein at least two of the plurality of power control parameter sets are configured for at least one SRI-PUSCH-PowerControl Id within the SRI-PUSCH-PowerControl list, and 
     wherein a number of the indicated SRS resources for codebook based transmission or the indicated SRS resource subsets for non-codebook transmission is the same as a number of the configured power control parameter sets in the SRI-PUSCH-PowerControl Id where the SRI value is mapped. 
     In another embodiment of the present disclosure, the SRI value indicates two SRS resources for codebook based transmission or two SRS resource subsets for non-codebook based transmission, and in said SRI-PUSCH-PowerControl list, two power control parameter sets including a first power control parameter set and a second power control parameter set are configured for the SRI-PUSCH-PowerControl Id where the SRI value is mapped. 
     In another embodiment of the present disclosure, a first SRS resource of the two SRS resources for codebook based transmission or a first SRS resource subset of the two SRS resource subsets for non-codebook based transmission is associated with the first power control parameter set, and a second SRS resource of the two SRS resources for codebook based transmission or a second SRS resource subset of the two SRS resource subsets for non-codebook based transmission is associated with the second power control parameter set. 
     In another embodiment of the present disclosure, determining the power of each PUSCH repetition of the PUSCH transmission further includes: determining the power of each PUSCH repetition of the PUSCH transmission based on the power control parameter set associated with the SRS resource for codebook based transmission or the SRS resource subset for non-codebook based transmission indicated by said one SRI value which is associated with said each PUSCH repetition and a corresponding TPC command of the first TPC command and the second TPC command. 
     Some other embodiments of the present disclosure provide a method. The method may include: transmitting a mapping pattern and a configuration of a plurality of power control parameter sets for a physical uplink shared channel (PUSCH) transmission which is configured to be transmitted in a plurality of time intervals repeatedly; transmitting a DCI for scheduling the PUSCH transmission, wherein the DCI includes an SRI field; and receiving the PUSCH transmission in the plurality of time intervals repeatedly, wherein a power of each PUSCH repetition of the PUSCH transmission is determined based on at least one SRI value in the SRI field, the configuration of the plurality of power control parameter sets and the mapping pattern. 
     Some other embodiments of the present disclosure provide an apparatus. The apparatus may include at least one non-transitory computer-readable medium having computer executable instructions stored therein; at least one receiver; at least one transmitter; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiver and the at least one transmitter. The computer executable instructions are programmed to implement the above methods with the at least one receiver, the at least one transmitter and the at least one processor. 
     The embodiments of the present disclosure can indicate a plurality power control parameter sets, and each PUSCH repetition&#39;s power can be determined by one of power control parameter sets and its associated TPC command according to the configured beam mapping pattern. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe the manner in which advantages and features of the application can be obtained, a description of the application is rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. These drawings depict only example embodiments of the application and are not therefore to be considered limiting of its scope. 
         FIG.  1    is a schematic diagram illustrating an exemplary wireless communication system according to some embodiments of the present disclosure; 
         FIG.  2    is an exemplary flow chart illustrating a method for power control of PUSCH repetition according to some embodiments of the present application; 
         FIG.  3    illustrates an exemplary scenario of power control of PUSCH repetition according to an embodiment of the present disclosure; 
         FIG.  4    illustrates another exemplary scenario of power control of PUSCH repetition according to another embodiment of the present disclosure; 
         FIG.  5    is a schematic block diagram illustrating an exemplary apparatus according to an embodiment of the present disclosure; and 
         FIG.  6    is a schematic block diagram illustrating another exemplary apparatus according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed description of the appended drawings is intended as a description of preferred embodiments of the present disclosure, and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure. 
     Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. 
     A wireless communication system generally includes one or more BSs and one or more UEs. Furthermore, a BS may be configured with one TRP (or panel) or some TRPs (or panels). A TRP can act like a small BS. The TRPs can communicate with each other by a backhaul link. Such backhaul link may be an ideal backhaul link or a non-ideal backhaul link. In a wireless communication system, one single TRP can be used to serve one or more UEs under control of a BS. In different scenario, TRP may be called in different terms. Persons skilled in the art should understand that as the 3GPP and the communication technology develop, the terminologies recited in the specification may change, which should not affect the scope of the present disclosure. It should be understood that the TRP(s) (or panel(s)) configured for the BS may be transparent to a UE. 
       FIG.  1    is a schematic diagram illustrating an exemplary wireless communication system according to some embodiments of the present disclosure. 
     Referring to  FIG.  1   , a wireless communication system  100  may include a BS  101  and a UE  105 . Furthermore, the BS  101  is further configured with two TRPs (e.g., TRP  103   a  and TRP  103   b ). Although only one BS, two TRPs, and one UE are shown for simplicity, it should be noted that the wireless communication system  100  may further include additional BSs, TRPs, and UEs. 
     The BS  101  may be a gNB in some scenarios (e.g. in 5G application scenario). The TRP  103   a  and TRP  103   b  may connect the BSs  101 , via, for example, a backhaul link. Each TRP can serve the UE  105 . As shown in  FIG.  1   , TRP  103   a  and TRP  103   b  can serve the UE  105  within a serving area or region (e.g., a cell or a cell sector). The TRP  103   a  and TRP  103   b  can communicate to each other via, for example, a backhaul link. It should be understood that the TRP  103   a  and TRP  103   b  configured for the BS  101  may be transparent to the UE  105 . 
     In some embodiments of the present disclosure, the BS  101  may be distributed over a geographic region. In certain embodiments, the BS  101  may also be referred to as an access point, an access terminal, a base, a macro cell, a Node-B, an enhanced Node B (eNB), a gNB, a Home Node-B, a relay node, or any device described using other terminology used in the art. 
     The UE  105  may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs), tablet computers, smart televisions (e.g., televisions connected to the Internet), set-top boxes, game consoles, security systems (including security cameras), vehicle on-board computers, network devices (e.g., routers, switches, and modems), or the like. According to an embodiment of the present disclosure, the UE  101  may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network. In some embodiments, the UE  105  may include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. Moreover, the UE  105  may be referred to as a subscriber unit, a mobile phone, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or any device described using other terminology used in the art. The UE  105  may communicate directly with the BSs  102  via uplink communication signals. 
     The wireless communication system  100  is compatible with any type of network that is capable of sending and receiving wireless communication signals. For example, the wireless communication system  100  is compatible with a wireless communication network, a cellular telephone network, a Time Division Multiple Access (TDMA)-based network, a Code Division Multiple Access (CDMA)-based network, an Orthogonal Frequency Division Multiple Access (OFDMA)-based network, an LTE network, a 3rd Generation Partnership Project (3GPP)-based network, a 3GPP 5G network, a satellite communications network, a high altitude platform network, and/or other communications networks. 
     In one embodiment, the wireless communication system  100  is compatible with the 5G NR of the 3GPP protocol, wherein the BS  101  transmit data using an orthogonal frequency division multiplexing (OFDM) modulation scheme on the downlink and the UE  105  transmit data on the uplink using Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) or Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) scheme. More generally, however, the wireless communication system  100  may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols. 
     In other embodiments, the BS  101  may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. Further, in some embodiments of the present application, the BS  101  may communicate over licensed spectrums, whereas in other embodiments, the BS  101  may communicate over unlicensed spectrums. The present application is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol. In yet some embodiments of present application, the BS  101  may communicate with the UE  105  using the 3GPP 5G protocols. 
     As shown in  FIG.  1   , there are multiple links between the UE  105  and the TRPs  103   a  and  103   b . The multiple links can be used for the UE  105  to transmit one or more PUSCH repetitions of a PUSCH transmission. Therefore, the power of a different link of a PUSCH repetition should be separately controlled and the power control of the PUSCH repetitions with multiple beams/TRPs should be enhanced. 
     In some embodiments, a sounding reference signal (SRS) is always configured within an SRS resource set consisting of one or more SRS resources. Several use cases have been identified for the SRS, and thus a radio resource control (RRC) configuration of an SRS resource set may contain a parameter called “usage”. Depending on a value of the usage, the SRS resource set will have different configurations appropriate for the indicated use case, e.g., the number of allowed sets, the number of allowed resources per set, etc. The valid values of this parameter are antenna switching, codebook, non-codebook, and beam management. 
     According to Release 15 (R15) specification, there are two transmission schemes for a PUSCH transmission which are codebook based transmission and non-codebook based transmission. And both schemes of the PUSCH transmission are related to an SRS resource set whose usage is configured as ‘codebook’ or ‘non-codebook’. For a codebook based PUSCH transmission scheme, a UE is configured to use one or more SRS resources for SRS transmission. Based on the transmitted SRS, a BS selects a preferred SRS resource. Then the BS indicates the preferred SRS resource with usage as ‘codebook’ in an SRS resource indicator (SRI) field of downlink control information (DCI) for scheduling a PUSCH transmission. For a non-codebook based PUSCH transmission scheme, the BS indicates a subset of SRS resources in a preferred SRS resource set with usage as ‘non-codebook’ in an SRI field of DCI for scheduling a PUSCH transmission. 
     Power control parameters for a PUSCH transmission are associated with the SRI value of the corresponding DCI. The power control procedure of a PUSCH transmission is drafted in TS 38.213 as follows: 
     7.1 Physical Uplink Shared Channel 
     For a PUSCH transmission on active UL BWP b, as described in Subclause 12, of carrier f of serving cell c, a UE first calculates a linear value {circumflex over (P)} PUSCH,b,f,c (i,j,q d ,l) of the transmit power P PUSCH,b,f,c (i,j,q d ,l), with parameters as defined in Subclause 7.1.1. For a PUSCH transmission scheduled by a DCI format 0_1 or configured by ConfiguredGrantConfig or semiPersistentOnPUSCH, if txConfig in PUSCH-Config is set to ‘codebook’ and each SRS resource in the SRS-ResourceSet with usage set to ‘codebook’ has more than one SRS port, the UE scales the linear value by the ratio of the number of antenna ports with a non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource. The UE splits the power equally across the antenna ports on which the UE transmits the PUSCH with non-zero power. 
     7.1.1 UE Behaviour 
     If a UE transmits a PUSCH on active UL BWP b of carrier f of serving cell c using parameter set configuration with index j and PUSCH power control adjustment state with index l, the UE determines the PUSCH transmission power P PUSCH,b,f,c (i,j,q d ,l) in PUSCH transmission occasion i as 
     
       
         
           
             
               
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     where,
         P CMAX,f,c (i) is the UE configured maximum output power defined in [8-1, TS 38.101-1], [8-2, TS38.101-2] and [8-3, TS38.101-3] for carrier f of serving cell c in PUSCH transmission occasion i.   P O_PUSCH,b,f,c (j) is a parameter composed of the sum of a component P O_NOMINAL_PUSCH,f,c (j) and a component P O_UE_PUSCH,b,f,c (j) where j∈{0, 1, . . . , J−1}.   If a UE is not provided P0-PUSCH-AlphaSet or for a PUSCH transmission scheduled by an RAR UL grant as described in Subclause 8.3, j=0, P O_UE_PUSCH,b,f,c (0)=0, and P O_NOMINAL_PUSCH,f,c (0)=P O_PRE +Δ PREAMBLE_Msg3 , where the parameter preambleReceivedTargetPower [11, TS 38.321] (for P O_PRE ) and msg3-DeltaPreamble (for Δ PREAMBLE_Msg3 ) are provided by higher layers, or Δ PREAMBLE_Msg3 =0 dB if msg3-DeltaPreamble is not provided, for carrier f of serving cell c   For a PUSCH (re)transmission configured by ConfiguredGrantConfig, j=1, P O_NOMINAL_PUSCH,f,c (1) is provided by p0-NominalWithoutGrant, or P O_NOMINAL_PUSCH,f,c (1)−P O_NOMINAL_PUSCH,f,c (0) if p0-NominalWithoutGrant is not provided, and P O_UE_PUSCH,b,f,c (1) is provided by p0 obtained from p0-PUSCH-Alpha in ConfiguredGrantConfig that provides an index P0-PUSCH-AlphaSetId to a set of P0-PUSCH-AlphaSet for active UL BWP b of carrier f of serving cell c   For j∈{2, . . . , J−1}=S J , a P O_NOMINAL_PUSCH,f,c (j) value, applicable for all j∈S J , is provided by p0-NominalWithGrant, or P O_NOMINAL_PUSCH,f,c (j)=P O_NOMINAL_PUSCH,f,c (0) if p0-NominalWithGrant is not provided, for each carrier f of serving cell c and a set of P O_UE_PUSCH,b,f,c (j) values are provided by a set of p0 in P0-PUSCH-AlphaSet indicated by a respective set of p0-PUSCH-AlphaSetId for active UL BWP b of carrier f of serving cell c
           If the UE is provided by SRI-PUSCH-PowerControl more than one values of p0-PUSCH-AlphaSetId and if DCI format 0_1 includes an SRI field, the UE obtains a mapping from sri-PUSCH-PowerControlId in SRI-PUSCH-PowerControl between a set of values for the SRI field in DCI format 0_1 [5, TS 38.212] and a set of indexes provided by p0-PUSCH-AlphaSetId that map to a set of P0-PUSCH-AlphaSet values. If the PUSCH transmission is scheduled by a DCI format 0_1 that includes an SRI field, the UE determines the value of P O_UE_PUSCH,b,f,c (j) from the p0-PUSCH-AlphaSetId value that is mapped to the SRI field value   If the PUSCH transmission is scheduled by a DCI format 0_0 or by a DCI format 0_1 that does not include an SRI field, or if SRI-PUSCHPowerControl is not provided to the UE, j=2, and the UE determines P O_UE_PUSCH,b,f,c (j) from the value of the first P0-PUSCH-AlphaSet in p0-AlphaSets   
           For α b,f,c (j)
           For j=0, α b,f,c (0) is a value of msg3-Alpha, when provided; otherwise, α b,f,c (0)=1   For j=1, α b,f,c (1) is provided by alpha obtained from p0-PUSCH-Alpha in ConfiguredGrantConfig providing an index P0-PUSCH-AlphaSetId to a set of P0-PUSCH-AlphaSet for active UL BWP b of carrier f of serving cell c   For j∈S J , a set of α b,f,c (j) values are provided by a set of alpha in P0-PUSCH-AlphaSet indicated by a respective set of p0-PUSCH-AlphaSetId for active UL BWP b of carrier f of serving cell c
               If the UE is provided SRI-PUSCH-PowerControl and more than one values of p0-PUSCH-AlphaSetId, and if DCI format 0_1 includes an SRI field, the UE obtains a mapping from sri-PUSCH-PowerControlId in SRI-PUSCH-PowerControl between a set of values for the SRI field in DCI format 0_1 [5, TS 38.212] and a set of indexes provided by p0-PUSCH-AlphaSetId that map to a set of P0-PUSCH-AlphaSet values. If the PUSCH transmission is scheduled by a DCI format 0_1 that includes an SRI field, the UE determines the values of a b,f,c (j) from the p0-PUSCH-AlphaSetId value that is mapped to the SRI field value   If the PUSCH transmission is scheduled by a DCI format 0_0 or by a DCI format 0_1 that does not include an SRI field, or if SRI-PUSCH-PowerControl is not provided to the UE, j=2, and the UE determines α b,f,c (j) from the value of the first P0-PUSCH-AlphaSet in p0-AlphaSets   
               
           M RB,b,f,c   PUSCH (i) is the bandwidth of the PUSCH resource assignment expressed in number of resource blocks for PUSCH transmission occasion i on active UL BWP b of carrier f of serving cell c and μ is an SCS configuration defined in [4, TS 38.211]   PL b,f,c (q d ) is a downlink pathloss estimate in dB calculated by the UE using reference signal (RS) index q d  for the active DL BWP, as described in Subclause 12, of carrier f of serving cell c
           If the UE is not provided PUSCH-PathlossReferenceRS or before the UE is provided dedicated higher layer parameters, the UE calculates PL b,f,c (q d ) using an RS resource from the SS/PBCH block that the UE uses to obtain MIB   If the UE is configured with a number of RS resource indexes, up to the value of maxNrofPUSCH-PathlossReferenceRSs, and a respective set of RS configurations for the number of RS resource indexes by PUSCH-PathlossReferenceRS, the set of RS resource indexes can include one or both of a set of SS/PBCH block indexes, each provided by ssb-Index when a value of a corresponding pusch-PathlossReferenceRS-Id maps to an SS/PBCH block index, and a set of CSI-RS resource indexes, each provided by csi-RS-Index when a value of a corresponding pusch-PathlossReferenceRS-Id maps to a CSI-RS resource index. The UE identifies an RS resource index q d  in the set of RS resource indexes to correspond either to an SS/PBCH block index or to a CSI-RS resource index as provided by pusch-PathlossReferenceRS-Id in PUSCH-PathlossReferenceRS   If the PUSCH transmission is scheduled by an RAR UL grant as described in Subclause 8.3, the UE uses the same RS resource index q d  as for a corresponding PRACH transmission   If the UE is provided SRI-PUSCH-PowerControl and more than one values of PUSCH-PathlossReferenceRS-Id, the UE obtains a mapping from sri-PUSCH-PowerControlId in SRI-PUSCH-PowerControl between a set of values for the SRI field in DCI format 0_1 and a set of PUSCH-PathlossReferenceRS-Id values. If the PUSCH transmission is scheduled by a DCI format 0_1 that includes an SRI field, the UE determines the RS resource index q d  from the value of PUSCH-PathlossReferenceRS-Id that is mapped to the SRI field value where the RS resource is either on serving cell c or, if provided, on a serving cell indicated by a value of pathlossReferenceLinking   If the PUSCH transmission is scheduled by a DCI format 0_0, and if the UE is provided a spatial setting by PUCCH-SpatialRelationInfo for a PUCCH resource with a lowest index for active UL BWP b of each carrier f and serving cell c, as described in Subclause 9.2.2, the UE uses the same RS resource index q d  as for a PUCCH transmission in the PUCCH resource with the lowest index   If the PUSCH transmission is scheduled by a DCI format 0_0 and if the UE is not provided a spatial setting for a PUCCH transmission, or by a DCI format 0_1 that does not include an SRI field, or if SRI-PUSCH-PowerControl is not provided to the UE, the UE determines an RS resource index q d  with a respective PUSCH-PathlossReferenceRS-Id value being equal to zero where the RS resource is either on serving cell c or, if provided, on a serving cell indicated by a value of pathlossReferenceLinking   For a PUSCH transmission configured by ConfiguredGrantConfig, if rrc-ConfiguredUplinkGrant is included in ConfiguredGrantConfig, an RS resource index q d  is provided by a value of pathlossReferenceIndex included in rrc-ConfiguredUplinkGrant where the RS resource is either on serving cell c or, if provided, on a serving cell indicated by a value of pathlossReferenceLinking   For a PUSCH transmission configured by ConfiguredGrantConfig that does not include rrc-ConfiguredUplinkGrant, the UE determines an RS resource index q d  from a value of PUSCH-PathlossReferenceRS-Id that is mapped to an SRI field value in a DCI format activating the PUSCH transmission. If the DCI format activating the PUSCH transmission does not include an SRI field, the UE determines an RS resource index q d  with a respective PUSCH-PathlossReferenceRS-Id value being equal to zero where the RS resource is either on serving cell c or, if provided, on a serving cell indicated by a value of pathlossReferenceLinking   
           PL b,f,c (q d )=referenceSignalPower−higher layer filtered RSRP, where referenceSignalPower is provided by higher layers and RSRP is defined in [7, TS 38.215] for the reference serving cell and the higher layer filter configuration provided by QuantityConfig is defined in [12, TS 38.331] for the reference serving cell   If the UE is not configured periodic CSI-RS reception, referenceSignalPower is provided by ss-PBCH-BlockPower. If the UE is configured 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 [6, TS 38.214]. If powerControlOffsetSS is not provided to the UE, the UE assumes an offset of 0 dB.
           Δ TF,b,f,c (i)=10 log 10 ((2 BPRE·K     s   −1)·β offset   PUSCH ) for K s =1.25 and Δ TF,b,f,c (i)=0 for K s =0 where K s  is provided by deltaMCS for each UL BWP b of each carrier f and serving cell c. If the PUSCH transmission is over more than one layer [6, TS 38.214], Δ TF,b,f,c (i)=0. BPRE and β offset   PUSCH , for active UL BWP b of each carrier f and each serving cell c, are computed as below   
               

     
       
         
           
             
               - 
               BPRE 
             
             = 
             
               
                 ∑ 
                 
                   r 
                   = 
                   0 
                 
                 
                   C 
                   - 
                   1 
                 
               
               
                 
                   K 
                   r 
                 
                 / 
                 
                   N 
                   RE 
                 
               
             
           
         
       
         
         
           
             
               
                  for PUSCH with UL-SCH data and BPRE=Q m ·R/β offset   PUSCH  for CSI transmission in a PUSCH without UL-SCH data, where
               c is a number of transmitted code blocks, K, is a size for code block r, and N RE  is a number of resource elements determined as   
             
               
             
           
         
       
    
     
       
         
           
             
               
                 N 
                 RE 
               
               = 
               
                 
                   
                     M 
                     
                       RB 
                       , 
                       b 
                       , 
                       f 
                       , 
                       c 
                     
                     PUSCH 
                   
                   ( 
                   i 
                   ) 
                 
                 · 
                 
                   
                     ∑ 
                     
                       j 
                       = 
                       0 
                     
                     
                       
                         
                           N 
                           
                             symb 
                             , 
                             b 
                             , 
                             f 
                             , 
                             c 
                           
                           PUSCH 
                         
                         ( 
                         i 
                         ) 
                       
                       - 
                       1 
                     
                   
                   
                     
                       N 
                       
                         sc 
                         , 
                         data 
                       
                       RB 
                     
                     ( 
                     
                       i 
                       , 
                       j 
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
         
         
           
             
               
                 
                   
                      where N symb,b,f,c   PUSCH (i) is a number of symbols for PUSCH transmission occasion i on active UL BWP b of carrier f of serving cell c, N sc,data   RB (i,j) is a number of subcarriers excluding DM-RS subcarriers and phase-tracking RS samples [4, TS 38.211] in PUSCH symbol j, 0≤j&lt;N symb,b,f,c   PUSCH (i), and c, K, are defined in [5, TS 38.212] 
                     β offset   PUSCH =1 when the PUSCH includes UL-SCH data and β offset   PUSCH =β offset   CSI,1 , as described in Subclause 9.3, when the PUSCH includes CSI and does not include UL-SCH data 
                     Q m  is the modulation order and R is the target code rate, as described in [6, TS 38.214], provided by the DCI format scheduling the PUSCH transmission that includes CSI and does not include UL-SCH data 
                   
                 
               
             
             For the PUSCH power control adjustment state f b,f,c (i,l) for active UL BWP b of carrier f of serving cell C in PUSCH transmission occasion i
           δ PUSCH,b,f,c (i,l) is a TPC command value included in a DCI format 0_0 or DCI format 0_1 that schedules the PUSCH transmission occasion i on active UL BWP b of carrier f of serving cell c or jointly coded with other TPC commands in a DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, as described in Subclause 11.3
               l∈{0,1} if the UE is configured with twoPUSCH-PC-AdjustmentStates and l=0 if the UE is not configured with twoPUSCH-PC-AdjustmentStates or if the PUSCH transmission is scheduled by an RAR UL grant as described in Subclause 8.3
                   For a PUSCH (re)transmission configured by ConfiguredGrantConfig, the value of l∈{0,1} is provided to the UE by powerControlLoopToUse   If the UE is provided SRI-PUSCH-PowerControl, the UE obtains a mapping between a set of values for the SRI field in DCI format 0_1 and the 1 value(s) provided by sri-PUSCH-ClosedLoopIndex. If the PUSCH transmission is scheduled by a DCI format 0_1 and if DCI format 0_1 includes an SRI field, the UE determines the 1 value that is mapped to the SRI field value   If the PUSCH transmission is scheduled by a DCI format 0_0 or by a DCI format 0_1 that does not include an SRI field, or if an SRI-PUSCH-PowerControl is not provided to the UE, l=0   If the UE obtains one TPC command from a DCI format 2_2 with CRC scrambled by a TPC-PUSCH-RNTI, the 1 value is provided by the closed loop indicator field in DCI format 2_2   
                   
               
         
           
         
       
    
     
       
         
           
             
               - 
               
                 
                   f 
                   
                     b 
                     , 
                     f 
                     , 
                     c 
                   
                 
                 ( 
                 
                   i 
                   , 
                   l 
                 
                 ) 
               
             
             = 
             
               
                 
                   f 
                   
                     b 
                     , 
                     f 
                     , 
                     c 
                   
                 
                 ( 
                 
                   
                     i 
                     - 
                     
                       i 
                       0 
                     
                   
                   , 
                   l 
                 
                 ) 
               
               + 
               
                 
                   ∑ 
                   
                     m 
                     = 
                     0 
                   
                   
                     
                       𝒞 
                       ⁡ 
                       ( 
                       
                         D 
                         i 
                       
                       ) 
                     
                     - 
                     1 
                   
                 
                 
                   
                     δ 
                     
                       PUSCH 
                       , 
                       b 
                       , 
                       f 
                       , 
                       c 
                     
                   
                   ( 
                   
                     m 
                     , 
                     l 
                   
                   ) 
                 
               
             
           
         
       
         
         
           
             
               
                 
                   
                     
                       
                          is the PUSCH power control adjustment state l for active UL BWP b of carrier f of serving cell c and PUSCH transmission occasion i if the UE is not provided tpc-Accumulation, where 
                       
                     
                     The δ PUSCH,b,f,c  values are given in Table 7.1.1-1 
                   
                 
               
             
           
         
       
    
     
       
         
           
             - 
             
               
                 ∑ 
                 
                   m 
                   = 
                   0 
                 
                 
                   
                     𝒞 
                     ⁡ 
                     ( 
                     
                       D 
                       i 
                     
                     ) 
                   
                   - 
                   1 
                 
               
               
                 
                   δ 
                   
                     PUSCH 
                     , 
                     b 
                     , 
                     f 
                     , 
                     c 
                   
                 
                 ( 
                 
                   m 
                   , 
                   l 
                 
                 ) 
               
             
           
         
       
         
         
           
             
               
                 
                   
                      is a sum of TPC command values in a set D i  of TPC command values with cardinality c(D i ) that the UE receives between K PUSCH (i−i 0 )−1 symbols before PUSCH transmission occasion i−i 0 , and K PUSCH (i) symbols before PUSCH transmission occasion i on active UL BWP b of carrier f of serving cell c for PUSCH power control adjustment state l, where i 0 &gt;0 is the smallest integer for which K PUSCH (i−i 0 ) symbols before PUSCH transmission occasion i−i 0 , is earlier than K PUSCH (i) symbols before PUSCH transmission occasion i 
                     If a PUSCH transmission is scheduled by a DCI format 0_0 or DCI format 0_1, K PUSCH (i) is a number of symbols for active UL BWP b of carrier f of serving cell c after a last symbol of a corresponding PDCCH reception and before a first symbol of the PUSCH transmission 
                     If a PUSCH transmission is configured by ConfiguredGrantConfig, K PUSCH (i) is a number of K PUSCH,min  symbols equal to the product of a number of symbols per slot, N symb   slot , and the minimum of the values provided by k2 in PUSCH-ConfigCommon for active UL BWP b of carrier f of serving cell c 
                     If the UE has reached maximum power for active UL BWP b of carrier f of serving cell c at PUSCH transmission occasion i−i 0  and 
                   
                 
               
             
           
         
       
    
     
       
         
           
             
               
                 
                   ∑ 
                   
                     m 
                     = 
                     0 
                   
                   
                     
                       𝒞 
                       ⁡ 
                       ( 
                       
                         D 
                         i 
                       
                       ) 
                     
                     - 
                     1 
                   
                 
                 
                   
                     δ 
                     
                       PUSCH 
                       , 
                       b 
                       , 
                       f 
                       , 
                       c 
                     
                   
                   ( 
                   
                     m 
                     , 
                     l 
                   
                   ) 
                 
               
               ≥ 
               0 
             
             , 
           
         
       
         
         
           
             
               
                 
                   
                      then f b,f,c (i,l)=f b,f,c (i−i 0 ,l)) 
                     If UE has reached minimum power for active UL BWP b of carrier f of serving cell c at PUSCH transmission occasion i−i 0  and 
                   
                 
               
             
           
         
       
    
     
       
         
           
             
               
                 
                   ∑ 
                   
                     m 
                     = 
                     0 
                   
                   
                     
                       𝒞 
                       ⁡ 
                       ( 
                       
                         D 
                         i 
                       
                       ) 
                     
                     - 
                     1 
                   
                 
                 
                   
                     δ 
                     
                       PUSCH 
                       , 
                       b 
                       , 
                       f 
                       , 
                       c 
                     
                   
                   ( 
                   
                     m 
                     , 
                     l 
                   
                   ) 
                 
               
               ≤ 
               0 
             
             , 
           
         
       
         
         
           
             
               
                 
                   
                      then f b,f,c (i,l)=f b,f,c (i−i 0 ,l) 
                     A UE resets accumulation of a PUSCH power control adjustment state l for active UL BWP b of carrier f of serving cell c to f b,f,c (k,l)=0, k=0, 1, . . . , i
                   If a configuration for a corresponding P O_UE_PUSCH,b,f,c (j) value is provided by higher layers   If a configuration for a corresponding a b,f,c (j) value is provided by higher layers   If j&gt;1 and the PUSCH transmission is scheduled by a DCI format 0_1 that includes an SRI field, and the UE is provided higher SRI-PUSCH-PowerControl, the UE determines the value of l from the value of j based on an indication by the SRI field for an sri-PUSCH-PowerControlId value associated with the sri-P0-PUSCH-AlphaSetId value corresponding to j and with the sri-PUSCH-ClosedLoopIndex value corresponding to l   If j&gt;1 and the PUSCH transmission is scheduled by a DCI format 0_0 or by a DCI format 0_1 that does not include an SRI field or the UE is not provided SRI-PUSCH-PowerControl, l=0   If j=1, 1 is provided by the value ofpowerControlLoopToUse   
                 
                   
                 
                 f b,f,c (i,l)=δ PUSCH,b,f,c (i,l) is the PUSCH power control adjustment state for active UL BWP b of carrier f of serving cell c and PUSCH transmission occasion i if the UE is provided tpc-Accumulation, where
               δ PUSCH,b,f,c  absolute values are given in Table 7.1.1-1   
             
                 If the UE receives a random access response message in response to a PRACH transmission on active UL BWP b of carrier f of serving cell c as described in Subclause 8
               f b,f,c (0,l)=ΔP rampup,b,f,c +δ msg2,b,f,c , where l=0 and
                   δ msg2,b,f,c  is a TPC command value indicated in the random access response grant of the random access response message corresponding to the PRACH transmission on active UL BWP b of carrier f in the serving cell c, and   
                   
             
               
             
           
         
       
    
     
       
         
           
             
               - 
               Δ 
               ⁢ 
               
                 P 
                 
                   rampup 
                   , 
                   b 
                   , 
                   f 
                   , 
                   c 
                 
               
             
             = 
             
               min 
               [ 
               
                 
                   { 
                   
                     max 
                     ⁡ 
                     ( 
                     
                       0 
                       , 
                       
                         
                           P 
                           
                             CMAX 
                             , 
                             f 
                             , 
                             c 
                           
                         
                         - 
                         
                           ( 
                           
                             
                               
                                 
                                   
                                     10 
                                     ⁢ 
                                     
                                       
                                         log 
                                         10 
                                       
                                       ( 
                                       
                                         
                                           2 
                                           μ 
                                         
                                         · 
                                         
                                           
                                             M 
                                             
                                               RB 
                                               , 
                                               b 
                                               , 
                                               f 
                                               , 
                                               c 
                                             
                                             PUSCH 
                                           
                                           ( 
                                           0 
                                           ) 
                                         
                                       
                                       ) 
                                     
                                   
                                   + 
                                 
                               
                             
                             
                               
                                 
                                   
                                     
                                       P 
                                       
                                         O_PUSCH 
                                         , 
                                         b 
                                         , 
                                         f 
                                         , 
                                         c 
                                       
                                     
                                     ( 
                                     0 
                                     ) 
                                   
                                   + 
                                   
                                     
                                       
                                         α 
                                         
                                           b 
                                           , 
                                           f 
                                           , 
                                           c 
                                         
                                       
                                       ( 
                                       0 
                                       ) 
                                     
                                     · 
                                     
                                       PL 
                                       c 
                                     
                                   
                                   + 
                                 
                               
                             
                             
                               
                                 
                                   
                                     
                                       Δ 
                                       
                                         TF 
                                         , 
                                         b 
                                         , 
                                         f 
                                         , 
                                         c 
                                       
                                     
                                     ( 
                                     0 
                                     ) 
                                   
                                   + 
                                   
                                     δ 
                                     
                                       
                                         msg 
                                         ⁢ 
                                         2 
                                       
                                       , 
                                       b 
                                       , 
                                       f 
                                       , 
                                       c 
                                     
                                   
                                 
                               
                             
                           
                           ) 
                         
                       
                     
                     ) 
                   
                   } 
                 
                 , 
                 
                   Δ 
                   ⁢ 
                   
                     P 
                     
                       rampuprequested 
                       , 
                       b 
                       , 
                       f 
                       , 
                       c 
                     
                   
                 
               
               ] 
             
           
         
       
         
         
           
             
               
                 
                   
                     
                       
                          and ΔP rampuprequested,b,f,c  is provided by higher layers and corresponds to the total power ramp-up requested by higher layers from the first to the last random access preamble for carrier f in the serving cell c, M RB,b,f,c   PUSCH (0) is the bandwidth of the PUSCH resource assignment expressed in number of resource blocks for the first PUSCH transmission on active UL BWP b of carrier f of serving cell c, and Δ TF,b,f,c (0) is the power adjustment of first PUSCH transmission on active UL BWP b of carrier f of serving cell c. 
                       
                     
                   
                 
               
             
           
         
       
    
     Table 7.1.1-1 shows mapping of TPC Command Field in DCI format 0_0, DCI format 0_1, or DCI format 2_2, with CRC scrambled by TPC-PUSCH-RNTI, or DCI format 2_3, to absolute and accumulated δ PUSCH,b,f,c  values or δ SRS,b,f,c  values. 
     
       
         
           
               
               
               
             
               
                 TABLE 7.1.1-1 
               
               
                   
               
               
                   
                 Accumulated 
                 Absolute 
               
               
                 TPC Command 
                 δ PUSCH, b, f, c  or δ SRS, b, f, c   
                 δ PUSCH, b, f, c  or δ SRS, b, f, c   
               
               
                 Field 
                 [dB] 
                 [dB] 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 0 
                 −1 
                 −4 
               
               
                 1 
                 0 
                 −1 
               
               
                 2 
                 1 
                 1 
               
               
                 3 
                 3 
                 4 
               
               
                   
               
            
           
         
       
     
     It should be noted that if there is SRI field in the corresponding DCI, a power control parameter set including p0-PUSCH, alpha, PUSCH pathloss reference RS and closed loop index is indicated by the mapping between the SRI and SRI-PUSCH-PowerControl. Therefore, each SRI is associated with a power control parameter set. 
     PUSCH power control information is transmitted by RRC signaling, and the RRC signaling of PUSCH power control is drafted in TS 38.331 as follows. 
     
       
         
           
               
             
               
                   
               
             
            
               
                 PUSCH-PowerControl ::=     SEQUENCE { 
               
               
                  tpc-Accumulation        ENUMERATED { disabled } 
               
               
                 OPTIONAL, -- Need S 
               
               
                  msg3-Alpha           Alpha 
               
               
                 OPTIONAL, -- Need S 
               
               
                  p0-NominalWithoutGrant     INTEGER (−202..24) 
               
               
                 OPTIONAL, -- Need M 
               
               
                  p0-AlphaSets          SEQUENCE (SIZE 
               
               
                 (1..maxNrofP0-PUSCH-AlphaSets)) OF P0-PUSCH-AlphaSet OPTIONAL, -- Need M 
               
               
                  pathlossReferenceRSToAddModList SEQUENCE (SIZE 
               
               
                 (1..maxNrofPUSCH-PathlossReferenceRSs)) OF PUSCH-PathlossReferenceRS 
               
               
                 OPTIONAL, -- Need N 
               
               
                  pathlossReferenceRSToReleaseList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofPUSCH-PathlossReferenceRSs)) OF PUSCH-PathlossReferenceRS-Id 
               
               
                 OPTIONAL, --Need N 
               
               
                  twoPUSCH-PC-AdjustmentStates   ENUMERATED {twoStates} 
               
               
                 OPTIONAL, -- Need S 
               
               
                  deltaMCS             ENUMERATED {enabled} 
               
               
                 OPTIONAL, -- Need S 
               
               
                  sri-PUSCH-MappingToAddModList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControl 
               
               
                 OPTIONAL, -- Need N 
               
               
                  sri-PUSCH-MappingToReleaseList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControlId 
               
               
                 OPTIONAL -- Need N 
               
               
                 } 
               
               
                 P0-PUSCH-AlphaSet ::=     SEQUENCE { 
               
               
                  p0-PUSCH-AlphaSetId       P0-PUSCH-AlphaSetId, 
               
               
                  p0              INTEGER (−16..15) 
               
               
                 OPTIONAL, -- Need S 
               
               
                  alpha             Alpha 
               
               
                 OPTIONAL -- Need S 
               
               
                 } 
               
               
                 P0-PUSCH-AlphaSetId ::=      INTEGER (0..maxNrofP0-PUSCH-AlphaSets-1) 
               
               
                 PUSCH-PathlossReferenceRS ::=  SEQUENCE { 
               
               
                  pusch-PathlossReferenceRS-Id   PUSCH-PathlossReferenceRS-Id, 
               
               
                  referenceSignal          CHOICE { 
               
               
                   ssb-Index             SSB-Index, 
               
               
                   csi-RS-Index           NZP-CSI-RS-ResourceId 
               
               
                  } 
               
               
                 } 
               
               
                 PUSCH-PathlossReferenceRS-Id ::=  INTEGER 
               
               
                 (0..maxNrofPUSCH-PathlossReferenceRSs-1) 
               
               
                 SRI-PUSCH-PowerControl ::=    SEQUENCE { 
               
               
                  sri-PUSCH-PowerControlId      SRI-PUSCH-PowerControlId, 
               
               
                  sri-PUSCH-PathlossReferenceRS-Id PUSCH-PathlossReferenceRS-Id, 
               
               
                  sri-P0-PUSCH-AlphaSetId       P0-PUSCH-AlphaSetId, 
               
               
                  sri-PUSCH-ClosedLoopIndex      ENUMERATED { i0, i1 } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     In R16, PDSCH repetitions with multiple beams have already been supported in the single DCI based multiple TRPs case, which implies that the backhaul of multiple TRPs is ideal or almost ideal. In the present application, we consider that PUSCH repetitions with multiple beams also works in the single DCI based multiple TRPs case. 
     In order to support PUSCH repetitions with multiple beams, the SRI field in the DCI should indicate multiple beams associated with multiple SRS resources for codebook based transmission or multiple SRS resource subsets for non-codebook based transmission for a PUSCH transmission. It is agreed in R17 that a UE can be implemented with multiple panels which can transmit multiple beams but only one panel can be used in a time interval considering the power consumption, which means only one beam can be used to transmit a PUSCH transmission at a time. And we assume that multiple SRS resource sets can be configured with the usage set to ‘codebook’ or ‘non-codebook’ where each SRS resource set can be associated with a panel. 
     In the present application, two schemes may be adopted to indicate multiple beams associated with multiple SRS resources for codebook based transmission or multiple SRS resource subsets for non-codebook based transmission in the SRI field of the DCI, and two schemes may be adopted to determine power control parameters accordingly. Similar to PDSCH repetition in multiple slots in R16, a mapping pattern (or called a beam mapping pattern) will be configured to indicate which beam to use for which PUSCH repetition. 
       FIG.  2    is an exemplary flow chart illustrating a method for power control of PUSCH repetition according to some embodiments of the present application. 
     As shown in  FIG.  2   , in step  210 , a BS may transmit a mapping pattern and a configuration of a plurality of power control parameter sets for a PUSCH transmission which is configured to be transmitted in a plurality of time intervals repeatedly. The BS may transmit the mapping pattern and the configuration of the plurality of power control parameter sets for the PUSCH transmission by a higher layer signaling, for example, an RRC signaling. The power control parameter set may include at least one of a power offset, a compensation factor, a pathloss reference RS, and a closed loop index. More details on the RRC signaling of the configuration of the plurality of power control parameter sets will be illustrated later. 
     In step  220 , the BS transmits a DCI for scheduling the PUSCH transmission. The DCI may include an SRI field. In an embodiment, the SRI field may include only one SRI value. In another embodiment, the SRI field may include a plurality of SRI values. 
     Furthermore, the DCI for scheduling the PUSCH transmission may further include a TPC command field. In an embodiment, the TPC command field may indicate one TPC command of one closed loop index. In another embodiment, the TPC command field may indicate a plurality of TPC commands of a plurality of closed loop indexes, and a TCP command of the TPC commands may correspond to a corresponding closed loop index of the closed loop indexes. 
     After receiving the configuration of the plurality of power control parameter sets and the DCI for the PUSCH transmission, then in step  230 , the UE may determine a power of each PUSCH repetition of the PUSCH transmission based on the SRI value(s) in the SRI field, the TPC command field, the configuration of the plurality of power control parameter sets and the mapping pattern. 
     And then in step  240 , the UE may transmit the PUSCH transmission in a plurality of time intervals repeatedly based on the determined power of each PUSCH repetition of the PUSCH transmission and the received mapping pattern. 
     In an embodiment of the present application, in the case that a plurality of SRI values are included in the SRI field, each SRI value indicates an SRS resource for codebook based transmission or an SRS resource subset for non-codebook based transmission. The configuration of the plurality of power control parameter sets includes a plurality of SRI-PUSCH-PowerControl lists, each of the SRI-PUSCH-PowerControl lists includes a power control parameter set, and the number of the SRI-PUSCH-PowerControl lists is the same as the number of the SRI values. 
     Furthermore, the mapping pattern may indicate each PUSCH repetition which the SRS resource for codebook based transmission or the SRS resource subset for non-codebook based transmission is associated with. Accordingly, the UE may determine the power of each PUSCH repetition of the PUSCH transmission based on the power control parameter set associated with the corresponding SRI value and the corresponding TPC command. 
     In another embodiment of the present application, in the case that one SRI value is included in the SRI field, the SRI value may indicate a plurality of SRS resources for codebook based transmission or a plurality of SRS resource subsets for non-codebook based transmission. 
     Besides the SRS resources or the SRS resource subsets, the SRI value may further map to one SRI-PUSCH-PowerControl list, and the configuration of the plurality of power control parameter sets includes the SRI-PUSCH-PowerControl list. A plurality of power control parameter sets may be configured for at least one SRI-PUSCH-PowerControl Id within the SRI-PUSCH-PowerControl list. That is, in the SRI-PUSCH-PowerControl list, there are one or more SRI-PUSCH-PowerControl Ids, and for the SRI-PUSCH-PowerControl Id(s), a plurality of power control parameter sets may be configured. The number of the indicated SRS resources for codebook based transmission or the indicated SRS resource subsets for non-codebook transmission is the same as the number of the configured power control parameter sets, which is configured for the SRI-PUSCH-PowerControl Id where the SRI value is mapped. 
     The mapping pattern may indicate each PUSCH repetition which the SRS resource for codebook based transmission or the SRS resource subset for non-codebook based transmission is associated with. Accordingly, the UE may determine the power of each PUSCH repetition of the PUSCH transmission based on the power control parameter set associated with the SRS resource for codebook based transmission or the SRS resource subset for non-codebook based transmission indicated by the SRI value which each PUSCH repetition is associated with and the corresponding TPC command. 
     Scenarios of power control of PUSCH repetition are provided as below for illustrative purpose according to some embodiments of the present application in connection with  FIGS.  3  and  4    by taking 2 beams of the UE for transmitting a PUSCH transmission with multiple repetitions. 
       FIG.  3    illustrates an exemplary scenario of power control of PUSCH repetition according to an embodiment of the present disclosure. 
     In this exemplary scenario, it is assumed that a PUSCH transmission is configured to be transmitted repeatedly in 4 slots. 
     As shown in  FIG.  3   , a UE may receive a DCI for scheduling a PUSCH transmission, and the DCI includes an SRI field. In the SRI filed, there are two SRI values, e.g., SRI 0 and SRI 1 as shown in  FIG.  3   . Each SRI value indicates an SRS resource for codebook based transmission or an SRS resource subset for non-codebook based transmission. It should be understood that two SRI values being in the SRI field is just an example, and persons skilled in the art would appreciate that more than two number of SRI values can also be used according to actual situations or needs. 
     For codebook based PUSCH transmission, two SRS resources with usage set to “codebook” can be configured. In this exemplary scenario, SRI 0 may indicate a first SRS resource of a first SRS resource set associated with some PUSCH repetitions, and SRI 1 may indicate a second SRS resource of a second SRS resource set associated with some other PUSCH repetitions. 
     For non-codebook based PUSCH transmission, two SRS resources sets with usage set to “non-codebook” can be configured. In this exemplary scenario, SRI 0 may indicate a first SRS resource subset of a first SRS resource set associated with some PUSCH repetitions, and SRI 1 may indicate a second SRS resource subset of a second SRS resource set associated with some other PUSCH repetitions. 
     Accordingly, for codebook based PUSCH transmission or non-codebook based PUSCH transmission, two SRI-PUSCH-PowerControl lists including a first SRI-PUSCH-PowerControl list and a second SRI-PUSCH-PowerControl list may be configured for the UE. That is, the number of the SRI-PUSCH-PowerControl lists is the same as the number of the SRI values. 
     A first power control parameter set may be indicated by mapping SRI 0 to the first SRI-PUSCH-PowerControl list, and a second power control parameter set may be indicated by mapping SRI 1 to the second SRI-PUSCH-PowerControl list. In particular, SRI 0 is mapped to the first SRI-PUSCH-PowerControl list, e.g., SRI-PUSCH-PowerControl list 0, to determine a first power control parameter set, e.g., power control parameter set 0; and SRI 1 is mapped to a second SRI-PUSCH-PowerControl list, e.g., SRI-PUSCH-PowerControl list 1, to determine a second power control parameter set, e.g., power control parameter set 1. 
     The SRI-PUSCH-PowerControl list may include one or more power control parameter sets. Similar to R15, a power control parameter set is composed of P0 (power offset), alpha (compensation factor), pathloss reference RS and closed loop index. And RRC configuration signaling in TS 38.331 may be updated as follows where two SRI-PUSCH-PowerControl lists are configured in PUSCH-PowerControl. 
     
       
         
           
               
             
               
                   
               
             
            
               
                 PUSCH-PowerControl ::=     SEQUENCE { 
               
               
                  tpc-Accumulation        ENUMERATED { disabled } 
               
               
                 OPTIONAL, -- Need S 
               
               
                  msg3-Alpha           Alpha 
               
               
                 OPTIONAL, -- Need S 
               
               
                  p0-NominalWithoutGrant     INTEGER (−202..24) 
               
               
                 OPTIONAL, -- Need M 
               
               
                  p0-AlphaSets          SEQUENCE (SIZE 
               
               
                 (1..maxNrofP0-PUSCH-AlphaSets)) OF P0-PUSCH-AlphaSet 
               
               
                 OPTIONAL, -- Need M 
               
               
                  pathlossReferenceRSToAddModList SEQUENCE (SIZE 
               
               
                 (1..maxNrofPUSCH-PathlossReferenceRSs)) OF PUSCH- 
               
               
                 PathlossReferenceRS 
               
               
                 OPTIONAL, -- Need N 
               
               
                  pathlossReferenceRSToReleaseList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofPUSCH-PathlossReferenceRSs)) OF PUSCH- 
               
               
                 PathlossReferenceRS-Id 
               
               
                 OPTIONAL, -- Need N 
               
               
                  twoPUSCH-PC-AdjustmentStates   ENUMERATED {twoStates} 
               
               
                 OPTIONAL, -- Need S 
               
               
                  deltaMCS             ENUMERATED {enabled} 
               
               
                 OPTIONAL, -- Need S 
               
               
                  sri-PUSCH-MappingToAddModList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControl 
               
               
                 OPTIONAL, -- Need N 
               
               
                  sri-PUSCH-MappingToReleaseList  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControlld 
               
               
                 OPTIONAL -- Need N 
               
               
                  sri-PUSCH-MappingToAddModList1  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControl 
               
               
                 OPTIONAL, -- Need N 
               
               
                  sri-PUSCH-MappingToReleaseList1  SEQUENCE (SIZE 
               
               
                 (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControlId 
               
               
                 OPTIONAL -- Need N 
               
               
                 } 
               
               
                 P0-PUSCH-AlphaSet ::=      SEQUENCE { 
               
               
                  p0-PUSCH-AlphaSetId        P0-PUSCH-AlphaSetId, 
               
               
                  p0                INTEGER (−16..15) 
               
               
                 OPTIONAL, -- Need S  
               
               
                  alpha              Alpha 
               
               
                 OPTIONAL -- Need S 
               
               
                 } 
               
               
                 P0-PUSCH-AlphaSetId ::=     INTEGER 
               
               
                 (0..maxNrofP0-PUSCH-AlphaSets-1) 
               
               
                 PUSCH-PathlossReferenceRS ::=  SEQUENCE { 
               
               
                  pusch-PathlossReferenceRS-Id   PUSCH-PathlossReferenceRS-Id, 
               
               
                  referencesignal          CHOICE { 
               
               
                   ssb-Index             SSB-Index, 
               
               
                   csi-RS-Index           NZP-CSI-RS-ResourceId 
               
               
                  } 
               
               
                 } 
               
               
                 PUSCH-PathlossReferenceRS-Id ::=  INTEGER 
               
               
                 (0..maxNrofPUSCH-PathlossReferenceRSs-1) 
               
               
                 SRI-PUSCH-PowerControl ::=     SEQUENCE { 
               
               
                  sri-PUSCH-PowerControlId      SRI-PUSCH-PowerControlId, 
               
               
                  sri-PUSCH-PathlossReferenceRS-Id  PUSCH-PathlossReferenceRS-Id, 
               
               
                  sri-P0-PUSCH-AlphaSetId      P0-PUSCH-AlphaSetId, 
               
               
                  sri-PUSCH-ClosedLoopIndex      ENUMERATED { i0, i1 } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     As shown in  FIG.  3   , SRI 0 is associated with the power control parameter set 0, which includes p0-PUSCH 0, alpha 0, pusch-PathlossReferenceRS 0 and closed loop index 0 of SRI-PUSCH-PowerControl list 0. SRI 1 is associated with the power control parameter set 1, which includes fields: p0-PUSCH 1, alpha 1, pusch-PathlossReferenceRS 1 and closed loop index 1 of SRI-PUSCH-PowerControl list 1. 
     In this exemplary scenario, as shown in  FIG.  3   , there are 4 bits in the TPC command field of the DCI. The first 2 bits in the TPC command field of the DCI is the TPC command of closed loop index 0 and the second 2 bits in the TPC command field of the DCI is the TPC command of closed loop index 1. Therefore, each power control parameter set of the two power control parameter sets associated with the SRI value in the SRI field is associated with a TPC command of 2 TPC commands in the TPC command field. 
     For example, the first 2 bits of TPC command is associated with the power control parameter set 0 since the power control parameter set 0 includes closed loop index 0, and the second 2 bits of the TPC command is associated with the power control parameter set 1 since the power control parameter set 1 includes closed loop index 1. 
     It should be understood that 4 bits being in the TPC command field is just an example, and persons skilled in the art would appreciate that other number of bits can also be used according to actual situations or needs. 
     In some other embodiments, there are 2 bits in the TPC command field of the DCI. The 2 bits in the TPC command field of the DCI is the TPC command of a closed loop index. That is, there is only one closed loop index, both the first power control parameter set and the second power control parameter set include the same closed loop index. In other words, for example, the closed loop index 0 and the closed loop index 1 as shown in  FIG.  3    are the same closed loop index. 
     Besides, a mapping pattern is configured to indicate each PUSCH repetition which SRS resource for codebook based transmission or SRS resource subset for non-codebook based transmission is associated with. In this exemplary scenario, as show in  FIG.  3   , it is assumed that the mapping pattern is 1122, which means the first SRS resource (e.g., SRS resource 0) for codebook based transmission or the first SRS resource subset (e.g., SRS resource subset 0) for non-codebook based transmission indicated by SRI 0 is associated with the transmission of the first and second PUSCH repetitions (e.g., PUSCH repetition 1 and PUSCH repetition 2), and the second SRS resource (e.g., SRS resource 1) for codebook based transmission or the second SRS resource subset (e.g., SRS resource subset 1) for non-codebook based transmission indicated by SRI 1 is associated the transmission of the third and fourth PUCCH repetitions (e.g., PUSCH repetition 3 and PUSCH repetition 4). 
     Since SRI 0 is associated with power control parameter set 0 and the first 2 bits of the TPC command in the TPC command field, the power of first and second PUSCH repetitions (e.g., PUSCH repetition 1 and PUSCH repetition 2) is determined according to the power control parameter set 0 and its associated TPC command. Since SRI 1 is associated with power control parameter set 1 and the second 2 bits of the TPC command in the TPC command field, the power of third and fourth repetitions (e.g., PUSCH repetition 3 and PUSCH repetition 4) is determined by the power control parameter set 1 and its associated TPC command. 
       FIG.  4    illustrates another exemplary scenario of power control of PUSCH repetition according to an embodiment of the present disclosure. 
     In this exemplary scenario, it is assumed that a PUSCH transmission is configured to be transmitted repeatedly in 4 slots. 
     As shown in  FIG.  4   , a UE may receive a DCI for scheduling a PUSCH transmission from a BS, and the DCI includes an SRI field. In the SRI filed, there is one SRI value, e.g., SRI as shown in  FIG.  4   . The SRI value indicates 2 SRS resources (e.g., SRS resource 0 and SRS resource 1) of 2 SRS resource sets for codebook based PUSCH transmission or 2 SRS resource subsets (e.g., SRS resource subset 0 and SRS resource subset 1) of 2 SRS resource sets for non-codebook based PUSCH transmission. 
     In an embodiment, the mapping of the SRI value in the SRI field to the SRS resources for codebook based transmission or SRS resource subsets for non-codebook based transmission may be updated by a medium access control-control element (MAC-CE). This embodiment is similar to PDSCH repetition in R16, which means two spatial relation information associated with 2 SRS resources for codebook transmission or 2 SRS resource subsets for non-codebook transmission are jointly indicated by one SRI value in the SRI field of the DCI. 
     Accordingly, an SRI-PUSCH-PowerControl Id in the SRI-PUSCH-PowerControl list should be mapped to 2 power control parameter sets, which means there are two p0-PUSCH values, two alpha values, two PUSCH pathloss reference RSs and two closed loop indexes configured for an SRI-PUSCH-PowerControl Id. It should be understood that 2 power control parameter sets are just an example, and the number of the power control parameter sets can be changed according to actual needs. 
     RRC configuration signaling of SRI-PUSCH-PowerControl in TS 38.331 should be updated as follows where only one SRI-PUSCH-PowerControl list is configured. In this example, only one SRI-PUSCH-PowerControl Id is illustrated, it should be understood that additional SRI-PUSCH-PowerControl Ids may be within the SRI-PUSCH-PowerControl list according to actual needs. 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 SRI-PUSCH-PowerControl ::= 
                 SEQUENCE { 
               
               
                   sri-PUSCH-PowerControlId 
                     SRI-PUSCH- 
               
               
                   
                     PowerControlId, 
               
               
                  sri-PUSCH-PathlossReferenceRS-Id 
                  PUSCH-PathlossReferenceRS- 
               
               
                   
                  Id, 
               
               
                  sri-PUSCH-PathlossReferenceRS-Id1 
                  PUSCH-PathlossReferenceRS- 
               
               
                   
                  Id, 
               
               
                  sri-P0-PUSCH-AlphaSetId 
                   P0-PUSCH-AlphaSetId, 
               
               
                   sri-P0-PUSCH-AlphaSetId1 
                     P0-PUSCH-AlphaSetId, 
               
               
                  sri-PUSCH-ClosedLoopIndex 
                    ENUMERATED { i0, i1 } 
               
               
                  sri-PUSCH-ClosedLoopIndex1 
                    ENUMERATED { i0, i1 } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     Therefore, the SRI value in the SRI field of the DCI is associated with 2 power control parameter sets mapped to an SRI-PUSCH-PowerControl Id of the SRI-PUSCH-PowerControl list indicated by the SRI value in the SRI field. In this exemplary scenario, the SRI-PUSCH-PowerControl list indicated by the SRI value in the SRI field is the extended SRI-PUSCH-PowerControl list as show in  FIG.  4   . 
     Furthermore, the first SRS resource for codebook based transmission or the first SRS resource subset for non-codebook based transmission indicated by the SRI value is associated with the first power control parameter set, and the second SRS resource for codebook based transmission or the second SRS resource subset for non-codebook transmission indicated by the SRI is associated with the second power control parameter set. For example, as shown in  FIG.  4   , SRS resource 0/SRS resource subset 0 is associated to power control parameter set 0 composed of p0-PUSCH 1, alpha 1, pusch-PathlossReferenceRS 1 and closed loop index 0. And SRS resource 1/SRS resource subset 1 is associated with power control parameter set 1 composed of p0-PUSCH 2, alpha 2, pusch-PathlossReferenceRS 2 and closed loop index 1. 
     In this exemplary scenario, as shown in  FIG.  4   , there are 4 bits in the TPC command field of the DCI. The first 2 bits in the TPC command field of the DCI is the TPC command of closed loop index 0 and the second 2 bits in the TPC command field of the DCI is the TPC command of closed loop index 1. Therefore, each power control parameter set of the two power control parameter sets associated with the SRI value in the SRI field is associated with a TPC command of 2 TPC commands in the TPC command field. 
     For example, the first 2 bits of TPC command is associated with the power control parameter set 0 since the power control parameter set 0 includes closed loop index 0, and the second 2 bits of the TPC command is associated with the power control parameter set 1 since the power control parameter set 1 includes closed loop index 1. 
     It should be understood that 4 bits being in the TPC command field is just an example, and persons skilled in the art would appreciate that other number of bits can also be used according to actual situations or needs. 
     In some other embodiments, there are 2 bits in the TPC command field of the DCI. The 2 bits in the TPC command field of the DCI is the TPC command of a closed loop index. That is, there is only one closed loop index, both the first power control parameter set and the second power control parameter set include the same closed loop index. In other words, for example, the closed loop index 0 and the closed loop index 1 as shown in  FIG.  4    are the same closed loop index. 
     Besides, a mapping pattern is configured to indicate each PUSCH repetition which SRS resource for codebook based transmission or SRS resource subset for non-codebook based transmission is associated with. In this exemplary scenario, as show in  FIG.  4   , it is assumed that the mapping pattern is 1212, which means the first SRS resource (e.g., SRS resource 0) for codebook based transmission or the first SRS resource subset (e.g., SRS resource subset 0) for non-codebook based transmission is associated with the transmission of the first and third PUSCH repetitions (e.g., PUSCH repetition 1 and PUSCH repetition 3), and the second SRS resource (e.g., SRS resource 1) for codebook based transmission or the second SRS resource subset (e.g., SRS resource subset 1) for non-codebook based transmission is associated with the transmission of the second and fourth PUSCH repetitions (e.g., PUSCH repetition 2 and PUSCH repetition 4). 
     Since the first SRS resource (e.g., SRS resource 0) for codebook based transmission or the first SRS resource subset (e.g., SRS resource subset 0) for non-codebook based transmission is associated with power control parameter set 0 and the first 2 bits of the TPC command of the DCI, the power of first and third repetitions (e.g., PUSCH repetition 1 and PUSCH repetition 3) is determined according to the power control parameter set 0 and its associated TPC command as shown in  FIG.  4   . Since the second SRS resource (e.g., SRS resource 1) for codebook based transmission or the second SRS resource subset (e.g., SRS resource subset 1) for non-codebook based transmission is associated with power control parameter set 1 and the second 2 bits of the TPC command of the DCI, the power of second and fourth repetitions (e.g., PUSCH repetition 2 and PUSCH repetition 4) is determined according to the power control parameter set 1 and its associated TPC command as shown in  FIG.  4   . 
     Therefore, through the above described embodiments of the present application, a plurality power control parameter sets can be indicated, and the power of each PUSCH repetition can be determined by one of power control parameter sets and its associated TPC command according to the configured beam mapping pattern. 
       FIG.  5    illustrates an apparatus according to some embodiments of the present application. In some embodiments of the present disclosure, the apparatus  500  may be UE  105  illustrated in  FIG.  1    or the UE in other embodiments of the present application. 
     As shown in  FIG.  5   , the apparatus  500  may include a receiver  501 , a transmitter  503 , a processer  505 , and a non-transitory computer-readable medium  507 . The non-transitory computer-readable medium  507  has computer executable instructions stored therein. The processer  505  is configured to be coupled to the non-transitory computer readable medium  507 , the receiver  501 , and the transmitter  503 . It is contemplated that the apparatus  500  may include more computer-readable mediums, receiver, transmitter and processors in some other embodiments of the present application according to practical requirements. In some embodiments of the present application, the receiver  501  and the transmitter  503  are integrated into a single device, such as a transceiver. In certain embodiments, the apparatus  500  may further include an input device, a memory, and/or other components. 
     In some embodiments of the present application, the non-transitory computer-readable medium  507  may have stored thereon computer-executable instructions to cause a processor to implement the above methods according to embodiments of the present application. 
       FIG.  6    illustrates an apparatus according to some other embodiments of the present application. In some embodiments of the present disclosure, the apparatus  600  may be BS  101  illustrated in  FIG.  1    or the BS in other embodiments of the present application. 
     As shown in  FIG.  6   , the apparatus  600  may include a receiver  601 , a transmitter  603 , a processer  605 , and a non-transitory computer-readable medium  607 . The non-transitory computer-readable medium  607  has computer executable instructions stored therein. The processer  605  is configured to be coupled to the non-transitory computer readable medium  607 , the receiver  601 , and the transmitter  603 . It is contemplated that the apparatus  600  may include more computer-readable mediums, receiver, transmitter and processors in some other embodiments of the present application according to practical requirements. In some embodiments of the present application, the receiver  601  and the transmitter  603  are integrated into a single device, such as a transceiver. In certain embodiments, the apparatus  600  may further include an input device, a memory, and/or other components. 
     In some embodiments of the present application, the non-transitory computer-readable medium  607  may have stored thereon computer-executable instructions to cause a processor to implement the above methods according to embodiments of the present application. 
     Persons skilled in the art should understand that as the technology develops and advances, the terminologies described in the present application may change, and should not affect or limit the principle and spirit of the present application. 
     Those having ordinary skill in the art would understand that the steps of a method described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product. 
     While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations may be apparent to those skilled in the art. For example, various components of the embodiments may be interchanged, added, or substituted in the other embodiments. Also, all of the elements of each figure are not necessary for operation of the disclosed embodiments. For example, one of ordinary skill in the art of the disclosed embodiments would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the disclosure. 
     In this document, the terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “a,” “an,” or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Also, the term “another” is defined as at least a second or more. The terms “including,” “having,” and the like, as used herein, are defined as “comprising.”