METHOD AND APPARATUS FOR OPERATING TIMER

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for operating a timer in a wireless transmit receive unit (WTRU).SOLUTION: A wireless transmit receive unit (WTRU) includes the steps of: receiving a circuit switch (CS) call request; transmitting an enhanced packet switch mobility management service request (ESR) in response to the CS call request; starting a timer in response to the transmittal of the ESR; receiving a handover command in response to the transmittal of the ESR; and stopping the timer upon reception of the handover command.