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 for controlling transmit power of a wireless transmit/receive unit (WTRU) comprising:
determining a transmit power spectral density, wherein the transmit power spectral density comprises a combination of an open loop uplink (UL) power control (PC) component, a closed loop PC component and a delta factor related to an offset value, wherein the open loop UL PC component is based on a pathloss measurement, wherein the closed loop PC component comprises a correction factor, and wherein the offset value is related to a modulation coding set (MCS);
determining a transmit power based on the determined transmit power spectral density and a number of assigned resource blocks (RBs); and
applying a minimum of a maximum transmit power level and the transmit power.
2. The method of claim 1 , further comprising: receiving signaling including the maximum transmit power level.
3. The method of claim 1 , further comprising: receiving a PC correction command, and wherein the correction factor is based on the received PC correction command or an accumulated correction command.
4. The method of claim 3 , wherein the PC correction command is received at a pre-configured signaling time.
5. The method of claim 1 , wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process.
6. The method of claim 5 , wherein any of the maximum transmit power level and the transmit power is applied in accordance with a timing of the HARQ process.
7. The method of claim 1 , wherein the open loop UL PC component comprises a cell-specific parameter.
8. The method of claim 1 , wherein the open loop UL PC component comprises a cell-specific parameter, and wherein the cell-specific parameter is provided from higher layers.
9. The method of claim 1 , wherein the open loop UL PC component comprises a WTRU-specific parameter.
10. The method of claim 1 , wherein the open loop UL PC component comprises a WTRU-specific parameter, and wherein the WTRU-specific parameter is provided from higher layers.
11. The method of claim 1 , wherein the open loop UL PC component comprises a cell-specific parameter and a WTRU-specific parameter.
12. The method of claim 11 , wherein the open loop UL PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific parameter and the WTRU-specific parameter are provided from higher layers.
13. The method of claim 1 , further comprising: receiving the maximum transmit power level.
14. The method of claim 1 , wherein the maximum transmit power level is based on a power class of the WTRU.
15. The method of claim 1 , wherein the maximum transmit power level is based on a capability of the WTRU.
16. A wireless transmit/receive unit (WTRU) comprising a processor, wherein the processor is configured to:
determine a transmit power spectral density, wherein the transmit power spectral density comprises a combination of an open loop uplink (UL) power control (PC) component, a closed loop PC component and a delta factor related to an offset value, wherein the open loop UL PC component is based on a pathloss measurement, wherein the closed loop PC component comprises a correction factor, and wherein the offset value is related to a modulation coding set (MCS); and
determine a transmit power based on the transmit power spectral density and a number of assigned resource blocks (RBs); and
apply a minimum of a maximum transmit power level and the transmit power.
17. The WTRU of claim 16 , further comprising a receiver, wherein the receiver is configured to receive signaling including the maximum transmit power level, and wherein the processor is configured to: obtain the maximum transmit power level signaled in the received signaling.
18. The WTRU of claim 16 , further comprising a receiver, wherein the receiver is configured to receive a PC correction command, and wherein the correction factor is based on the received PC correction command or an accumulated correction command.
19. The WTRU of claim 18 , wherein the PC correction command is received at a pre-configured signaling time.
20. The WTRU of claim 16 , wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process.
21. The WTRU of claim 16 , wherein the processor is adapted to apply the maximum transmit power level or the transmit power in accordance with a timing of the HARQ process.
22. The WTRU of claim 16 , wherein the open loop UL PC component comprises a cell-specific parameter.
23. The WTRU of claim 16 , wherein the open loop UL PC component comprises a cell-specific parameter, and wherein the cell-specific parameter is provided from higher layers.
24. The WTRU of claim 16 , wherein the open loop UL PC component comprises a WTRU-specific parameter.
25. The WTRU of claim 16 , wherein the open loop UL PC component comprises a WTRU-specific parameter, and wherein the WTRU-specific parameter is provided from higher layers.
26. The WTRU of claim 16 , wherein the open loop UL PC component comprises a cell-specific parameter and a WTRU-specific parameter.
27. The WTRU of claim 16 , wherein the open loop UL PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific parameter and the WTRU-specific parameter are provided from higher layers.
28. The WTRU of claim 16 , wherein the processor is configured to: receive the maximum transmit power level.
29. The WTRU of claim 16 , wherein the maximum transmit power level is based on WTRU power class.
30. The WTRU of claim 16 , wherein the maximum transmit power level is based on a maximum allowed power.