Method and device of performing multi-radio access bearer power scaling

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

• a radio transceiving circuitry;
• and
• an enhanced uplink, EUL, processor comprising a UE transmission power determining entity configured to determine that 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, βed,k, by a scaling factor to one or more reduced power scaling values βed,k,reduced;
• characterized in, that the EUL processor further comprises:
• a DPDCH transmission determining entity configured to determine a DPDCH transmission status and wherein the power scaling entity is configured to apply DTX on enhanced Dedicated Physical Control Channel, E-DPCCH, when data is transmitted on the DPDCH;
• and,
• a power scaling entity configured to apply DTX on E-DPCCH when a predetermined minimum E-DPDCH gain factor, ‘smallest quantised βed,k value’, is reached for all E-DPDCH gain factors, βed,k, and DTX is applied for all E-DPDCHs.

A computer program, comprising computer readable code which, when run on a processing circuitry of a user equipment, UE, causes the user equipment to perform power scaling on uplink transmissions 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 transmissions from the UE to the receiving RAN, the computer program, when run on the processing circuitry is further configured to cause the UE to:

• determine that a total UE transmit power exceeds a predetermined maximum power limit value;
• reduce the total UE transmit power to the predetermined maximum power limit value, by reducing one or more E-DPDCH gain factors, βed,k, by a scaling factor to one or more reduced power scaling values βed,k,reduced;
• and
• apply DTX on enhanced Dedicated Physical Control Channel, E-DPCCH, when data is transmitted on the DPDCH and a predetermined minimum E-DPDCH gain factor, ‘smallest quantised βed,k value’, is reached for all E-DPDCH gain factors βed,k, and DTX is applied for all E-DPDCHs.