Method and apparatus for radio resource control connection resume

Abstract

A method and an apparatus for radio resource control (RRC) connection resume are provided. The RRC connection resume method, which is performed by user equipment (UE), includes: receiving an RRC suspend message including a Radio Access Network (RAN)-based Notification Area (RNA) update timer; transitioning to an RRC inactive state in response to receiving the RRC suspend message; triggering an RNA update procedure based on the RNA update timer during the RRC inactive state; and performing an RRC resume procedure according to the RRC suspend message.

What is claimed is: 
     
         1 . A radio resource control (RRC) connection resume method performed by user equipment (UE), the RRC connection resume method comprising:
 receiving an RRC suspend message comprising a Radio Access Network (RAN)-based Notification Area (RNA) update timer;   transitioning to an RRC inactive state in response to receiving the RRC suspend message;   triggering an RNA update procedure based on the RNA update timer after transitioning to the RRC inactive state; and   performing an RRC resume procedure according to the RRC suspend message.   
     
     
         2 . The RRC connection resume method of  claim 1 , further comprising:
 receiving an RRC resume response during the RRC resume procedure.   
     
     
         3 . The RRC connection resume method of  claim 2 , wherein the RRC resume response comprises at least one of:
 a data packet acknowledgement (ACK) or non-acknowledgement (NACK); or   an area update response.   
     
     
         4 . The RRC connection resume method of  claim 1 , further comprising:
 during the RRC resume procedure,
 transmitting an area update request, and 
 receiving an area update response. 
   
     
     
         5 . The RRC connection resume method of  claim 1 , wherein the RRC suspend message further comprises an RRC resume validity timer and area information. 
     
     
         6 . The RRC connection resume method of  claim 5 , further comprising:
 starting the RRC resume validity timer when the RRC resume validity timer is received.   
     
     
         7 . The RRC connection resume method of  claim 6 , further comprising:
 removing at least a part of a UE context when the RRC resume validity timer expires.   
     
     
         8 . The RRC connection resume method of  claim 1 , further comprising:
 transmitting an RRC resume request during the RRC resume procedure.   
     
     
         9 . The RRC connection resume method of  claim 8 , wherein the RRC resume request comprises at least one of:
 an RRC resume request cause; or   source cell information.   
     
     
         10 . The RRC connection resume method of  claim 1 , further comprising:
 receiving area information via another RRC message.   
     
     
         11 . A mobile communication device comprising:
 at least one processor; and   at least one memory coupled to the at least one processor, the at least one memory storing at least one computer-executable instruction that, when executed by the at least one processor, causes the mobile communication device to: 
 receive a radio resource control (RRC) suspend message comprising a Radio Access Network (RAN)-based Notification Area (RNA) update timer; 
 transition to an RRC inactive state in response to receiving the RRC suspend message; 
 trigger an RNA update procedure based on the RNA update timer after the transition to the RRC inactive state; and 
 perform an RRC resume procedure according to the RRC suspend message. 
   
     
     
         12 . The mobile communication device of  claim 11 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the device to:
 receive an RRC resume response during the RRC resume procedure.   
     
     
         13 . The mobile communication device of  claim 12 , wherein the RRC resume response comprises at least one of:
 a data packet acknowledgement (ACK) or non-acknowledgement (NACK); or   an area update response.   
     
     
         14 . The mobile communication device of  claim 11 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the device to:
 during the RRC resume procedure,
 transmit an area update request, and 
 receive an area update response. 
   
     
     
         15 . The mobile communication device of  claim 11 , wherein the RRC suspend message further comprises an RRC resume validity timer and area information. 
     
     
         16 . The mobile communication device of  claim 15 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the device to:
 start the RRC resume validity timer when the RRC resume validity timer is received.   
     
     
         17 . The mobile communication device of  claim 16 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the device to:
 remove at least a part of a device context when the RRC resume validity timer expires.   
     
     
         18 . The mobile communication device of  claim 11 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the mobile communication device to:
 transmit an RRC resume request during the RRC resume procedure.   
     
     
         19 . The mobile communication device of  claim 18 , wherein the RRC resume request comprises at least one of:
 an RRC resume request cause; or   source cell information.   
     
     
         20 . The mobile communication device of  claim 11 , wherein the at least one computer-executable instruction, when executed by the at least one processor, further causes the mobile communication device to:
 receive area information via another RRC message.