Method and Apparatus for Scheduling Request

Abstract

The present invention provides a method of performing Scheduling Request (SR) in a user equipment (UE) of a wireless communication system. The method includes steps of triggering an SR, sending an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource, and skipping a plurality of subsequent SR transmission opportunities after the SR message is sent.

1 . A method for performing Scheduling Request (SR) in a user equipment (UE) of a wireless communication system, the method comprising:
 triggering an SR;   sending an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource; and   skipping a plurality of transmission opportunities for sending the SR message after the SR message is sent.   
     
     
         2 . The method of  claim 1 , wherein the SR is triggered when uplink data arrives to a transmission buffer of the UE and there is no uplink transmission resource available. 
     
     
         3 . The method of  claim 1  further comprising:
 keeping on sending the SR message at a next transmission opportunity next to the plurality of transmission opportunities when the SR is still not cancelled. 
 
     
     
         4 . The method of  claim 3 , wherein the SR is cancelled when the UE receives an uplink transmission resource allocated to a new transmission. 
     
     
         5 . The method of  claim 4 , wherein the uplink transmission resource is an Uplink Shared Channel (UL-SCH) resource. 
     
     
         6 . The method of  claim 3 , wherein the SR is cancelled when the number of times that the SR message is sent reaches to a pre-defined number. 
     
     
         7 . The method of  claim 1 , wherein the number of the plurality of transmission opportunities is determined by a timer. 
     
     
         8 . The method of  claim 1 , wherein the number of the plurality of transmission opportunities is determined by a counter. 
     
     
         9 . A communication device for performing Scheduling Request (SR) in a user equipment (UE) of a wireless communication system, the communication device comprising:
 a processor for executing a program code; and   a memory coupled to the processor for storing the program code;
 wherein the program code comprises: 
 triggering an SR; 
 sending an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource; and 
 skipping a plurality of transmission opportunities for sending the SR message after the SR message is sent. 
   
     
     
         10 . The communication device of  claim 9 , wherein the SR is triggered when uplink data arrives to a transmission buffer of the UE and there is no uplink transmission resource available. 
     
     
         11 . The communication device of  claim 9 , wherein the program code further comprises:
 keeping on sending the SR message at a transmission opportunity next to the plurality of transmission opportunities when the SR is still not cancelled.   
     
     
         12 . The communication device of  claim 11 , wherein the SR is cancelled when the UE receives an uplink transmission resource allocated to a new transmission. 
     
     
         13 . The communication device of  claim 12 , wherein the uplink transmission resource is an Uplink Shared Channel (UL-SCH) resource. 
     
     
         14 . The communication device of  claim 11 , wherein the SR is cancelled when the number of times that the SR message is sent reaches to a pre-defined number. 
     
     
         15 . The communication device of  claim 9 , wherein the number of the plurality of transmission opportunities is determined by a timer. 
     
     
         16 . The communication device of  claim 9 , wherein the number of the plurality of transmission opportunities is determined by a counter.