Coordinated uplink transmission in lte drx operations for a wireless transmit receive unit

Abstract

A method and apparatus for discontinuous reception (DRX) operation in a wireless transmit receive unit aligns uplink and downlink transmissions with a DRX cycle. The transmission may be a channel quality indicator report, a sounding reference signal, or a silence descriptor among other downlink and uplink transmissions.

What is claimed: 
     
         1 . A method implemented by a wireless transmit receive unit (WTRU) for aligning uplink transmissions with a discontinuous reception (DRX) cycle, comprising:
 determining that the DRX cycle is a DRX cycle of a first length;   receiving an uplink channel allocation for a periodic uplink transmission; and   sending the periodic uplink transmission during at least one of the DRX on-duration period or the DRX active time period.   
     
     
         2 . The method of  claim 1 , wherein the periodic uplink transmission is a channel quality indicator (CQI) report. 
     
     
         3 . The method of  claim 2 , further comprising receiving an allocation of a physical uplink shared channel (PUSCH) for the CQI report for the DRX cycle of the first length, on the condition that the DRX cycle of the first length is shorter than a configured threshold. 
     
     
         4 . The method of  claim 2 , further comprising receiving a CQI request from an evolved-nodeB (eNB) and starting an inactivity timer. 
     
     
         5 . The method of  claim 2 , further comprising setting the DRX active time period to a length sufficient for transmitting the CQI report. 
     
     
         6 . The method as in  claim 1 , wherein the uplink transmission is a sounding reference symbol (SRS) transmission. 
     
     
         7 . The method as in  claim 6 , further comprising comparing the length of the DRX cycle of the first length to a SRS transmission period and sending the SRS transmission on a condition that the SRS transmission period is greater than or equal to the length of the DRX cycle of the first length. 
     
     
         8 . The method as in  claim 6 , further comprising configuring a DRX cycle of a second length that is longer than the first length, determining a SRS transmission period and aligning the SRS with the DRX cycle of the second length, and sending the SRS transmission during a DRX active time period on a condition that the SRS transmission period equals an integer multiple of the length of the DRX cycle of the second length. 
     
     
         9 . A method implemented by a wireless transmit/receive unit (WTRU) for aligning a discontinuous reception (DRX) cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:
 receiving a plurality of SID packets during a voice-over-Internet Protocol (VoIP) silent period;   activating a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and   aligning the long DRX cycle with subsequently received SID packets in a downlink signal.   
     
     
         10 . A method implemented by a wireless transmit/receive unit (WTRU) for aligning a discontinuous reception (DRX) cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:
 sending a scheduling request for an uplink SID transmission, the scheduling request sent during a DRX on duration or a DRX active time period of a DRX cycle;   receiving an allocation for the uplink SID transmission during the DRX on duration or the DRX active time period;   activating a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and   aligning the long DRX cycle with subsequently sent uplink SID transmission.   
     
     
         11 . A wireless transmit/receive unit (WTRU) for aligning a discontinuous (DRX) cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:
 a processor configured at least in part, to:
 receive a plurality of SID packets during a VoIP silent period; 
 activate a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and 
 align the long DRX cycle with subsequently received SID packets in a downlink signal. 
   
     
     
         12 . A wireless transmit/receive unit (WTRU) for aligning a discontinuous reception (DRX) cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:
 a processor configured at least in part to:
 send a scheduling request for an uplink SID transmission, the scheduling request sent during a DRX on duration or a DRX active time period of a DRX cycle; 
 receive an allocation for the uplink SID transmission during the DRX on duration or the DRX active time period; 
 activate a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and 
 align the long DRX cycle with subsequently sent uplink SID transmission.