TFC and E-TFC selection for a user equipment
A user equipment determines transport format combinations (TFCs) that are available for at a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment. A TFC is selected from the available TFCs for the DCH. Based on a remaining power after the TFC selecting, enhanced uplink TFCs (E-TFCs) are selected that are available for an enhanced dedicated channel (E-DCH). An E-TFC is selected for the E-DCH from the available E-TFCs.
1. A method for use by a user equipment, comprising:
determining transport format combinations (TFCs) that are available for a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment;
selecting a TFC from the available TFCs for the DCH;
based on a remaining power after the TFC selecting, determining enhanced uplink TFCs (E-TFCs) that are available for an enhanced dedicated channel (E-DCH);
selecting an E-TFC for the E-DCH from the available E-TFCs; and
transmitting the DCH as formatted per the selected TFC and the E-DCH as formatted per the selected E-TFC.
2. The method of claim 1 wherein the selecting the TFC and the E-TFC occurs on a transmit time interval (TTI) basis.
3. The method of claim 1 , further comprising:
providing a minimum set of E-TFCs which can be selected for the E-DCH when the required power of an E-TFC of the minimum set would result in the user equipment exceeding the maximum transmit power.
4. The method of claim 3 wherein a transmission power level of the transmitted E-DCH is scaled when the maximum transmit power would be exceeded without the E-DCH transmit power being scaled.
5. A user equipment comprising:
a transport format combination (TFC) selection unit to determine transport format combinations (TFCs) that are available for a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment, wherein the TFC selection unit selects a TFC from the available TFCs for transmission of the DCH, the TFC selection unit determines enhanced uplink TFCs (E-TFCs) that are available for an enhanced dedicated channel (E-DCH) based on a remaining power after the TFC is selected, and selects an E-TFC for transmission of the E-DCH from the available E-TFCs.
6. The user equipment of claim 5 wherein the user equipment transmits the DCH as formatted per the selected TFC and the E-DCH as formatted per the selected E-TFC.
7. The user equipment of claim 5 wherein the TFC selection unit selects the TFC and the E-TFC on a transmit time interval (TTI) basis.
8. The user equipment of claim 5 wherein the TFC selection unit selects a minimum set of E-TFCs for the E-DCH when the required power of an E-TFC of the minimum set exceeds the maximum transmit power.
9. The user equipment of claim 8 wherein the user equipment scales a transmission power level of the transmitted E-DCH when the maximum transmit power would be exceeded without the E-DCH transmit power being scaled.
10. The user equipment of claim 5 comprising a transmit power estimation unit to calculate a transmission power level associated with TFCs and E-TFCs.
11. The user equipment of claim 10 comprising a measurement unit to take physical measurements.
12. The user equipment of claim 11 wherein the transmit power estimation unit uses the physical measurements and a gain factor associated with TFCs and E-TFCs to calculate a transmission power level associated with the TFCs and E-TFCs.
13. The user equipment of claim 5 wherein the TFC selection unit is on an integrated circuit.