Patent ID: 8098628
Filing Date: 2012-01-17
Classification: H04W

Abstract:
1. A packet communication method, comprising the steps of: (A) transmitting, from a mobile station to a radio base station, a random access request that includes mobile station information assigned to the mobile station, through a random access channel allocated to a predetermined radio resource; (B) receiving, at the radio base station, the random access request from the mobile station; and (C) transmitting, from the mobile station to the radio base station, the random access request, by changing a radio resource used for transmitting the random access channel, when the mobile station fails to receive, from the radio base station, the random access response that includes the mobile station information, wherein in the step (B), when a handover is performed, the radio base station notifies, to the mobile station, a preamble signal pattern to be used by the mobile station and is specified by a radio base station which is the destination of the handover, as additional information of the mobile station information.