Method and apparatus for transmitting scheduling request signal in mobile communication system

Abstract

Disclosed is a method for transmitting a scheduling request (SR) by a user equipment (UE) in a wireless communication system, including receiving information regarding an SR transmission resource, triggering an SR based on at least a condition that at least one buffer status report (BSR) is triggered and not canceled, and setting a counter for SR transmission to 0 if the SR is triggered and there is no other pending SR.

What is claimed is: 
     
         1 . A method for transmitting a scheduling request (SR) by a user equipment (UE) in a wireless communication system, comprising:
 receiving information regarding an SR transmission resource;   triggering an SR based on at least a condition that at least one buffer status report (BSR) is triggered and not canceled; and   setting a counter for SR transmission to 0 if the SR is triggered and there is no other pending SR.   
     
     
         2 . The method of  claim 1 , further comprising:
 checking whether the at least one BSR is a regular BSR; and   triggering the SR based on at least the condition that the least one BSR is triggered and not canceled, and the at least one BSR is a regular BSR.   
     
     
         3 . The method of  claim 1 , wherein the triggered SR is canceled based on at least a condition that a medium access control packet data unit (MAC PDU) including the at least one BSR is assembled. 
     
     
         4 . The method of  claim 1 , further comprising:
 initiating a random access procedure if the counter is not less than a maximum number of the SR transmission.   
     
     
         5 . The method of  claim 4 , wherein the SR is canceled when the random access procedure is initiated. 
     
     
         6 . The method of  claim 4 , wherein at least one uplink grant is cleared if the counter is not less than the maximum number of the SR transmission. 
     
     
         7 . An apparatus for transmitting a scheduling request (SR) by a user equipment (UE) in a wireless communication system, comprising:
 a receiver configured to receive information regarding an SR transmission resource; and   a controller configured to trigger an SR based on at least a condition that at least one buffer status report (BSR) is triggered and not canceled, and set a counter for SR transmission to 0 if the SR is triggered and there is no other pending SR.   
     
     
         8 . The apparatus of  claim 7 , wherein the controller is further configured to check whether the at least one BSR is a regular BSR and trigger the SR based on at least the condition that the least one BSR is triggered and not canceled, and the at least one BSR is a regular BSR. 
     
     
         9 . The apparatus of  claim 7 , wherein the controller is further configured to cancel the triggered SR based on at least a condition that a medium access control packet data unit (MAC PDU) including the at least one BSR is assembled. 
     
     
         10 . The apparatus of  claim 7 , wherein the controller is further configured to initiate a random access procedure if the counter is not less than a maximum number of the SR transmission. 
     
     
         11 . The apparatus of  claim 10 , wherein the controller is further configured to cancel the SR when the random access procedure is initiated. 
     
     
         12 . The apparatus of  claim 10 , wherein the controller is further configured to clear at least one uplink grant if the counter is not less than the maximum number of the SR transmission.