Method and Device of Performing Multi-Radio Access Bearer Power Scaling

Abstract

The present disclosure relates to a method and user equipment, UE, in a wireless communication network of performing power scaling on uplink transmission to a receiving radio access node, RAN. The disclosure particularly relates to a method and user equipment for power scaling on a multi-radio access bearer, multi-RAB, wherein a Dedicated Physical Data Channel, DPDCH, and an enhanced Dedicated Physical Data Channel, E-DPDCH are configured for uplink transmission from the UE to the receiving RAN. The method comprises determining a total UE transmit power exceeding a predetermined maximum power limit value. The total UE transmit power is reduced to the predetermined maximum power limit value by reducing one or more E-DPDCH gain factors by an equal scaling factor. A DPDCH transmission status is determined, whereupon a power scaling procedure is selected based on the determined DPDCH transmission status. The selected power scaling procedure is applied on the uplink transmission.

What is claimed is: 
     
         1 . A method in a user equipment, UE, in a wireless communication network of performing power scaling on uplink transmission to a receiving radio access node, RAN, on a multi-radio access bearer, multi-RAB, wherein a Dedicated Physical Data Channel, DPDCH, and an enhanced Dedicated Physical Data Channel, E-DPDCH are configured for uplink transmission from the UE to the receiving RAN, comprising:
 determining a total UE transmit power exceeding a predetermined maximum power limit value;   reducing total UE transmit power to the predetermined maximum power limit value by reducing one or more E-DPDCH gain factors by an equal scaling factor;   determining a DPDCH transmission status;   selecting a power scaling procedure based on the determined DPDCH transmission status; and   applying the selected power scaling procedure on the uplink transmission.   
     
     
         2 . The method of  claim 1 , wherein a first power scaling procedure is selected when the DPDCH transmission status reveals that data is transmitted on the DPDCH. 
     
     
         3 . The method of  claim 2 , wherein the first power scaling procedure complies with a legacy 3GPP power scaling procedure for power scaling when a DPDCH is configured. 
     
     
         4 . The method of  claim 1 , wherein a second power scaling procedure is selected when the step of determining DPDCH transmission status reveals that data is not transmitted on the DPDCH. 
     
     
         5 . The method of  claim 4 , wherein the second power scaling procedure complies with a legacy 3GPP power scaling procedure for power scaling when a DPDCH is not configured. 
     
     
         6 . The method of  claim 1 , wherein the wireless communication network is Universal Mobile Telecommunications Systems, UMTS, wideband code division multiple access, W-CDMA. 
     
     
         7 . A user equipment, UE, for a wireless communication network, the UE being configured for performing power scaling on uplink transmission to a receiving radio access node, RAN, on a multi-radio access bearer, multi-RAB, wherein a Dedicated Physical Data Channel, DPDCH, and an enhanced Dedicated Physical Data Channel E-DPDCH are configured for uplink transmission from the UE to the receiving RAN, the UE comprising:
 radio transceiving circuitry; and   an enhanced uplink, EUL, processor comprising a UE transmission power determining entity configured to determine when a total UE transmit power exceeds a predetermined maximum power limit value, a UE power reduction entity configured to reduce the total UE transmit power to the predetermined maximum value by reducing one or more E-DPDCH gain factors by an equal scaling factor, a DPDCH transmission determining entity configured to determine a DPDCH transmission status; and, a power scaling entity configured to select a power scaling procedure based on the determined DPDCH transmission status and to apply the selected power scaling procedure on uplink transmission from the radio transceiving circuitry.   
     
     
         8 . The user equipment, UE, of  claim 7 , wherein the power scaling entity is configured to select a first power scaling procedure when the DPDCH transmission status reveals that data is transmitted on the DPDCH. 
     
     
         9 . The user equipment, UE, of  claim 8 , wherein the first power scaling procedure complies with a legacy 3GPP power scaling procedure for power scaling when a DPDCH is configured. 
     
     
         10 . The user equipment, UE, of  claim 7 , wherein the power scaling entity is configured to select a second power scaling procedure when the DPDCH transmission status reveals that data is not transmitted on the DPDCH. 
     
     
         11 . The user equipment, UE, of  claim 10 , wherein the second power scaling procedure complies with a legacy 3GPP power scaling procedure for power scaling when a DPDCH is not configured. 
     
     
         12 . The user equipment, UE, of  claim 7 , wherein the wireless communication network is Universal Mobile Telecommunications Systems, UMTS, wideband code division multiple access, W-CDMA. 
     
     
         13 . A non-transitory computer-readable medium storing a computer program comprising program instructions that, when executed processing circuitry in a user equipment, UE, configures the UE, with respect to operation in a wireless communication network, perform power scaling on an uplink transmission to a receiving radio access node, RAN, on a multi-radio access bearer, multi-RAB, wherein a Dedicated Physical Data Channel, DPDCH, and an enhanced Dedicated Physical Data Channel, E-DPDCH are configured for uplink transmission from the UE to the receiving RAN, said computer program comprising program instructions configuring the UE to:
 determine a total UE transmit power exceeding a predetermined maximum power limit value;   reduce total UE transmit power to the predetermined maximum power limit value by reducing one or more E-DPDCH gain factors by an equal scaling factor;   determine a DPDCH transmission status;   select a power scaling procedure based on the determined DPDCH transmission status; and   apply the selected power scaling procedure on the uplink transmission.