Method and Apparatus for Handling Radio Link Failure

Abstract

A method for handling radio link failure in a user equipment of a wireless communication system is disclosed. The wireless communication system supports Carrier Aggregation such that the UE is able to perform transmission and/or reception through multiple carriers. The method includes steps of configuring a plurality of carriers and controlling a timer utilized for detecting the radio link failure according to a status of a primary carrier within the plurality of carriers.

1 . A method for handling radio link failure in a user equipment (UE) of a wireless communication system, the wireless communication system supporting Carrier Aggregation (CA) such that the UE is able to perform transmission and/or reception through multiple carriers, the method comprising:
 configuring a plurality of carriers; and   controlling a timer utilized for detecting the radio link failure according to a status of a primary carrier within the plurality of carriers.   
     
     
         2 . The method of  claim 1 , wherein controlling the timer according to the status of the primary carrier within the plurality of carriers is starting the timer when a radio problem is detected on the primary carrier. 
     
     
         3 . The method of  claim 2 , wherein the radio problem is detected on the primary carrier when consecutive out-of-sync situations on the primary carrier are detected. 
     
     
         4 . The method of  claim 1 , further comprising determining the radio link failure occurs on the primary carrier upon expiry of the timer. 
     
     
         5 . The method of  claim 1 , further comprising triggering a connection re-establishment procedure upon expiry of the timer. 
     
     
         6 . The method of  claim 1 , wherein the wireless communication system is a Long Term Evolution Advanced (LTE-A) system. 
     
     
         7 . A communication device for handling radio link failure in a user equipment (UE) of a wireless communication system, the wireless communication system supporting Carrier Aggregation (CA) such that the UE is able to perform transmission and/or reception through multiple carriers, the communication device comprising:
 a processor for executing a program; and   a memory coupled to the processor for storing the program; wherein the program comprises:
 configuring a plurality of carriers; and 
 controlling a timer utilized for detecting the radio link failure according to a status of a primary carrier within the plurality of carriers. 
   
     
     
         8 . The communication device of  claim 7 , wherein controlling the timer according to the status of the primary carrier within the plurality of carriers in the program is starting the timer when a radio problem is detected on the primary carrier. 
     
     
         9 . The communication device of  claim 8 , wherein the radio problem is detected on the primary carrier when consecutive out-of-sync situations on the primary carrier are detected. 
     
     
         10 . The communication device of  claim 7 , wherein the program further comprises determining the radio link failure occurs on the primary carrier upon expiry of the timer. 
     
     
         11 . The communication device of  claim 7 , wherein the program further comprises triggering a connection re-establishment procedure upon expiry of the timer. 
     
     
         12 . The communication device of  claim 7 , wherein the wireless communication system is a Long Term Evolution Advanced (LTE-A) system.