Method and apparatus for transmitting scheduling request signal in mobile communication system
A method and an apparatus are provided for transmitting a scheduling request signal of a terminal in a mobile communication system. If a Buffer Status Report (BSR) is triggered, it is checked whether the BSR is canceled. If the BSR is not cancelled, a Scheduling Request (SR) is triggered for requesting resources for transmitting the BSR.
1. A method for transmitting a Scheduling Request (SR) by a User Equipment (UE) in a mobile communication system, comprising the steps of:
receiving information regarding an SR transmission resource;
checking whether at least one Buffer Status Report (BSR) is triggered and canceled; and
triggering an SR based on at least a condition that the least one BSR is triggered and not canceled,
wherein if the SR is triggered and there is no other SR pending, a counter for SR transmission is set to 0.
2. The method of claim 1 , wherein checking whether the BSR is canceled is performed in every Transmission Time Interval (TTI).
3. 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.
4. The method of claim 3 , wherein the regular BSR is triggered if data becomes available for transmission with high priority.
5. 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.
6. The method of claim 1 , wherein a random access procedure is initiated if a number of SR transmissions that arrive corresponds to a max number of SR transmissions.
7. The method of claim 1 , wherein the SR is canceled when a random access procedure is initiated.
8. The method of claim 1 , wherein at least one uplink grant is cleared if a number of SR transmissions that arrive corresponds to a max number of SR transmissions.
9. An apparatus for transmitting a Scheduling Request (SR) by a User Equipment (UE) in a mobile communication system, comprising:
a receiver for receiving information regarding an SR transmission resource; and
a controller for checking whether at least one Buffer Status Report (BSR) is triggered and canceled, and triggering a Scheduling Request (SR) based on at least a condition that the at least one BSR is triggered and not canceled,
wherein if the SR is triggered and there is no other SR pending, a counter for SR transmission is set to 0.
10. The apparatus of claim 9 , wherein the controller checks whether the BSR is canceled, in every Transmission Time Interval (TTI).
11. The apparatus of claim 9 , wherein the controller checks whether the at least one BSR is a regular BSR and triggers 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.
12. The apparatus of claim 11 , wherein the controller triggers the regular BSR if data becomes available for transmission with high priority.
13. The apparatus of claim 9 , wherein the controller cancels 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.
14. The apparatus of claim 9 , wherein the controller initiates a random access procedure if a number of SR transmissions that arrive corresponds to a max number of SR transmissions.
15. The apparatus of claim 9 , wherein the controller cancels the SR when a random access procedure is initiated.
16. The apparatus of claim 9 , wherein the controller clears at least one uplink grant if a number of SR transmissions that arrive corresponds to a max number of SR transmissions.