Uplink power control for distributed wireless communication

Abstract

A method and apparatus for power control for distributed wireless communication is disclosed including one or more power control loops associated with a wireless transmit/receive unit (WTRU). Each power control loop may include open loop power control or closed loop power control. A multi-phase power control method is also disclosed with each phase representing a different time interval and a WTRU sends transmissions at different power levels to different set of node-Bs or relay stations during different phases to optimize communications.

What is claimed is: 
     
         1 . A wireless transmit/receive unit (WTRU) comprising:
 a processor configured to generate a first closed loop power control factor for a first set of transmission time intervals (TTIs) and a second closed loop power control factor for a second set of TTIs, wherein the first closed loop power control factor is determined by accumulating first power commands and the second closed loop power control factor is derived by accumulating second power commands; and   a transmitter configured to transmit at a transmission power level based on the first closed loop power control factor in the first set of TTIs and to transmit at a transmission power level based on the second closed loop power control factor in the second set of TTIs.   
     
     
         2 . The WTRU of  claim 1 , wherein the first closed loop power control factor and the second closed loop power control factor are independent. 
     
     
         3 . The WTRU of  claim 1 , wherein the transmissions in the first set of TTIs and the second set of TTIs are single-carrier frequency division multiple access (SC-FDMA) transmissions. 
     
     
         4 . The WTRU of  claim 1 , wherein the WTRU is a long term evolution (LTE) WTRU. 
     
     
         5 . The WTRU of  claim 1 , wherein the first power commands and the second power commands are different. 
     
     
         6 . A method for use in a wireless transmit/receive unit (WTRU), comprising:
 utilizing, by the WTRU, a first closed loop power control factor for a first set of transmission time intervals (TTIs) and a second closed loop power control factor for a second set of TTIs, wherein the first closed loop power control factor is determined by accumulating first power commands and the second closed loop power control factor is derived by accumulating second power commands;   transmitting, by the WTRU, at a transmission power level based on the first closed loop power control factor in the first set of TTIs; and   transmitting, by the WTRU, at a transmission power level based on the second closed loop power control factor in the second set of TTIs.   
     
     
         7 . The method of  claim 6 , wherein the first closed loop power control factor and the second closed loop power control factor are independent. 
     
     
         8 . The method of  claim 6 , wherein the transmissions in the first set of TTIs and the second set of TTIs are single-carrier frequency division multiple access (SC-FDMA) transmissions. 
     
     
         9 . The method of  claim 6 , wherein the WTRU is a long term evolution (LTE) WTRU. 
     
     
         10 . The method of  claim 6 , wherein the first power commands and the second power commands are different.