Combined open loop/closed loop method for controlling uplink power of a mobile station
A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSD Tx , (e.g. power per RB).
1. A method implemented in a wireless transmit receive unit (WTRU), the method comprising:
receiving signaling indicating an uplink (UL) resource assignment, a power control (PC) correction command and an assigned modulation coding set (MCS); and
applying a transmit power to an UL transmission, wherein the transmit power is based on a combination of a bandwidth of the UL resource assignment, an open loop PC component, a closed loop PC component and a delta factor related to an offset value, wherein:
the open loop PC component is based on pathloss and open loop PC parameters;
the closed loop PC component includes a correction factor;
the correction factor is based on the PC correction command; and
the offset value is related to the assigned MCS.
2. The method of claim 1 , wherein applying a transmit power comprises:
applying, to the UL transmission, a minimum of a maximum transmit power level and the transmit power based on a combination of a bandwidth of the UL resource assignment, an open loop PC component, a closed loop PC component and a delta factor related to an offset value.
3. The method of claim 2 , wherein the maximum transmit power level is based on at least one of (i) a power class of the WTRU, and (ii) a capability of the WTRU.
4. The method of claim 2 , further comprising:
receiving signaling indicating the maximum transmit power level.
5. The method of claim 1 , wherein the signaling comprises an UL grant, and wherein the UL grant is associated with a Hybrid Access Repeat Request (HARQ) process.
6. The method of claim 1 , wherein applying the transmit power comprises:
applying the transmit power in accordance with a timing of a Hybrid Access Repeat Request (HARQ) process.
7. The method of claim 6 , wherein applying the transmit power in accordance with a timing of the HARQ process comprises:
applying the transmit power at a next transmission time of the HARQ process following reception of an UL grant.
8. The method of claim 1 , wherein the signaling comprises an UL grant associated with a Hybrid Access Repeat Request (HARQ) process, and wherein applying the transmit power comprises:
applying the transmit power at a next transmission time of the associated HARQ process following reception of the UL grant.
9. The method of claim 1 , wherein the open loop PC parameters comprise at least one of a cell-specific parameter and a WTRU-specific parameter.
10. The method of claim 1 , wherein the correction factor is zero (0) in an initial uplink transmission.
11. The method of claim 1 , wherein the UL transmission comprises any of (i) data, (ii) a combination of data and control information, and (iii) feedback information.
12. The method of claim 1 , wherein the correction factor being based on the PC correction command comprises the correction factor being based on an accumulation of multiple PC correction commands including the PC correction command.
13. A wireless transmit receive unit (WTRU) comprising a processor configured to:
receive signaling indicating an uplink (UL) resource assignment, a power control (PC) correction command and an assigned modulation coding set (MCS); and
apply a transmit power to an UL transmission, wherein the transmit power is based on a combination of a bandwidth of the UL resource assignment, an open loop PC component, a closed loop PC component and a delta factor related to an offset value, wherein:
the open loop PC component is based on pathloss and open loop PC parameters;
the closed loop PC component includes a correction factor;
the correction factor is based on the PC correction command; and
the offset value is related to the assigned MCS.
14. The WTRU of claim 13 , wherein the processor being configured to apply a transmit power comprises the processor being configured to:
apply, to the UL transmission, a minimum of a maximum transmit power level and the transmit power based on a combination of a bandwidth of the UL resource assignment, an open loop PC component, a closed loop PC component and a delta factor related to an offset value.
15. The WTRU of claim 14 , wherein the maximum transmit power level is based on at least one of (i) a power class of the WTRU, and (ii) a capability of the WTRU.
16. The WTRU of claim 14 , wherein the processor is configured to:
receive signaling indicating the maximum transmit power level.
17. The WTRU of claim 13 , wherein the signaling comprises an UL grant, and wherein the UL grant is associated with a Hybrid Access Repeat Request (HARQ) process.
18. The WTRU of claim 13 , wherein the processor is configured to:
apply the transmit power in accordance with a timing of a Hybrid Access Repeat Request (HARQ) process.
19. The WTRU of claim 18 , wherein the processor is configured to:
apply the transmit power at a next transmission time of the HARQ process following reception of an UL grant.
20. The WTRU of claim 13 , wherein the signaling comprises an UL grant associated with a Hybrid Access Repeat Request (HARQ) process, and wherein the processor is configured to:
apply the transmit power at a next transmission time of the associated HARQ process following reception of the UL grant.
21. The WTRU of claim 13 , wherein the open loop PC parameters comprise at least one of a cell-specific parameter and a WTRU-specific parameter.
22. The WTRU of claim 13 , wherein the correction factor is zero (0) in an initial uplink transmission.
23. The WTRU of claim 13 , wherein the UL transmission comprises any of (i) data, (ii) a combination of data and control information, and (iii) feedback information.
24. The WTRU of claim 13 , wherein the correction factor being based on the PC correction command comprises the correction factor being based on an accumulation of multiple PC correction commands including the PC correction command.