Cell reselection method for increasing random access success rate in wireless access system

摘要

The present invention relates to a wireless access system, and more specifically to a method for efficiently performing a cell reselection and an apparatus for performing the same when a terminal fails in a random access. The method for enabling user equipment to reselect cells in the wireless access system according to one embodiment of the present invention, comprises the steps of: starting a random access procedure for a first cell selected according to a first condition; and performing a cell reselection procedure according to a second condition if the random access procedure is not successfully completed before a timer set from the starting step expires.

主权项

1. A method of performing a cell reselection at a user equipment in a wireless access system, the method comprising:
determining a first rank of cells by:
giving a prescribed weighting on a signal quality of a serving cell currently connected or attempting to connect to the user equipment, andgiving a prescribed penalty on a signal quality of a cell other than the serving cell: selecting a first cell based on the first rank of cells; transmitting a random access preamble to the selected first cell; starting a timer when the random access preamble is transmitted; and if a response to the random access preamble is not received before the timer expires:
determining a second rank of cells without considering the prescribed weighting or the prescribed penalty;selecting a second cell based on the second rank of cells; andtransmitting a random access preamble to the selected second cell.