Patent ID: 8280377

Claim:
A method of cell reselection performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving first priority information for a different frequency or a Radio Access Technology (RAT); receiving second priority information for the different frequency or the RAT; receiving information related to a validity timer which indicates a valid duration for the second priority information; starting the validity timer; performing cell reselection based on the second priority information while the validity timer is running; receiving validity control information for an extension of the validity timer; extending the running of the validity timer based on the validity control information; performing cell reselection based on the second priority information while the extended validity timer is running; and performing cell reselection based on the first priority information when the extended validity timer expires, wherein: the first priority information is applied to all UE in a cell; and the second priority information is applied to the UE.