Radio Network Node, User Equipment and Methods Therein

Abstract

Some embodiments herein relate to method in a user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, which user equipment is served by a radio network node in the radio communications network. The user equipment receives, from the radio network node, an indication indicating a set of power control parameters out of multiple sets of power control parameters, which multiple sets of power control parameters are stored at the user equipment. The user equipment determines a transmit power based on the indicated set of power control parameters.

1 . A method in a user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, wherein the user equipment is served by a radio network node in the radio communications network, the method comprising:
 receiving, from the radio network node, an indication indicating a set of power control parameters out of multiple sets of power control parameters, wherein the multiple sets of power control parameters are stored at the user equipment;   determining the transmit power based on the indicated set of power control parameters.   
     
     
         2 . The method according to  claim 1 , wherein the multiple sets of power control parameters comprises a specific set of power control parameters to apply for one or more subframes, and wherein the indication indicates a subframe comprised in the one or more subframes. 
     
     
         3 . The method according to  claim 1 , wherein the indication is comprised in an uplink grant message, and wherein the indication is a pointer in a list of sets of power control parameters, wherein the pointer indicates in the list what set of power control parameter to apply by the user equipment when determining transmit power. 
     
     
         4 . The method according to  claim 1 , wherein the set of power control parameters comprises at least one of: a maximum transmit power; a target received power, a value indicating percentage of a pathloss that is to be taken into account when determining transmit power, a power offset value, and a power command value. 
     
     
         5 . The method according to  claim 4 , wherein the determining comprises to determine transmit power using a formula defined as 
       
         
           
             
               
                 
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         where:
 P PUSCH,c (i) is the transmit power for subframe i over a physical uplink shared channel; 
 P CMAX,c (i) is the maximum transmit power; 
 M PUSCH,c (i) is a bandwidth of a Physical Uplink Shared Channel resource assignment expressed in number of resource blocks; 
 P O_PUSCH,c (i) is the target received power; 
 α c ϵ{0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1}, and is the value indicating percentage of a pathloss that is to be taken into account when determining transmit power; 
 PL c  is the downlink path loss estimate; 
 Δ TF,c (i) is the power offset value; and 
 f c (i) is the power command value. 
 
       
     
     
         6 . The method according to  claim 1 , wherein the receiving further comprises receiving an accumulative power command, and wherein the determining further comprises determining to accumulate the accumulative power command with a previously used power command, and wherein different accumulations are done for different sets of power control parameters. 
     
     
         7 . The method according to  claim 1 , further comprising
 receiving the multiple sets of power control parameters from the radio network node during configuration of the user equipment; and   storing the received multiple sets of power control parameters at the user equipment.   
     
     
         8 . A method in a radio network node for controlling a transmit power of a user equipment in a radio communications network, wherein the radio network node serves the user equipment in the radio communications network, the method comprising:
 determining a set of power control parameters to be used by the user equipment for determining transmit power of the user equipment; and   transmitting an indication to the user equipment, wherein the indication indicates the set of power control parameters out of multiple sets of power control parameters stored at the user equipment, thereby controlling the transmit power of the user equipment.   
     
     
         9 . The method according to  claim 8 , further comprising configuring the user equipment with the multiple sets of power control parameters by sending the multiple sets to the user equipment. 
     
     
         10 . The method according to  claim 8 , wherein the multiple sets of power control parameters comprises a specific set of power control parameters to apply for one or more subframes, and the indication indicates a subframe comprised in the one or more subframes. 
     
     
         11 . The method according to  claim 10 , wherein the radio network node serves the user equipment in a cell, and wherein the one or more subframes is a subframe or subframes used for a downlink transmission in the cell or a cell neighbouring the cell. 
     
     
         12 . The method according to  claim 8 , wherein the indication is comprised in an uplink grant message, wherein the indication is a pointer in a list of sets of power control parameters, wherein the pointer indicates in the list what set of power control parameter to apply by the user equipment when determining transmit power. 
     
     
         13 . The method according to  claim 8 , wherein the set of power control parameters comprises at least one of: a maximum transmit power; a target received power, a value indicating percentage of a pathloss that is to be taken into account when determining transmit power, a power offset value, and a power command value. 
     
     
         14 . The method according to  claim 8 , further comprising retrieving the indication indicating the determined power control parameter from a memory at the radio network node. 
     
     
         15 . The method according to  claim 8 , wherein the determining comprises analyzing an interference situation in a cell serving the user equipment or an interference situation in a cell neighbouring the cell. 
     
     
         16 . The method according to  claim 8 , wherein the indication is transmitted for granted subframes, wherein the granted subframes experience adjacent channel interference. 
     
     
         17 . A user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, wherein the user equipment is configured to be served by a radio network node in the radio communications network, wherein the user equipment comprises:
 a memory configured to have multiple sets of power control parameters stored thereon;   a receiver configured to receive, from the radio network node, an indication indicating a set of power control parameters out of the stored multiple sets of power control parameters; and   a determining circuit configured to determine a transmit power based on the indicated set of power control parameters.   
     
     
         18 . The user equipment according to  claim 17 , wherein the multiple sets of power control parameters comprises a specific set of power control parameters to apply for one or more subframes, and wherein the indication indicates a subframe comprised in the one or more subframes. 
     
     
         19 . The user equipment according to  claim 17 , wherein the receiver is configured to receive an uplink grant message comprising the indication, wherein the indication is a pointer in a list of sets of power control parameters, and wherein the pointer indicates in the list what set of power control parameter to apply in the determining circuit. 
     
     
         20 . The user equipment according to  claim 17 , wherein the set of power control parameters comprises at least one of: a maximum transmit power; a target received power, a value indicating percentage of a pathloss that is to be taken into account when determining transmit power, a power offset value, and a power command value.