Patent ID: 8331326
Filing Date: 2012-12-11
Classification: H04J,H04W,Y02D

Abstract:
1. A method implemented in a wireless transmit/receive unit (WTRU) for performing a handover from a source cell to a target cell, the method comprising: initiating reception and processing of a primary broadcast channel (P-BCH) of the target cell after receiving a handover command from an evolved Node B (eNB) associated with the source cell; sending a random access preamble to an eNB associated with the target cell, wherein the random access preamble is sent using a contention-based random access channel (RACH) procedure on condition that no dedicated RACH preamble is indicated in the handover command; receiving a random access response from the eNB associated with the target cell; sending a handover complete message to the eNB associated with the target cell; applying a first mode of operation, such that a system frame number (SFN) of the target cell is not required, prior to acquiring the SFN of the target cell; and applying a second mode of operation upon acquiring the SFN, wherein the second mode of operation utilizes the SFN of the target cell.