Patent ID: 7480509
Filing Date: 2009-01-20
Classification: H04W

Abstract:
1. A handover method for minimizing a service delay due to a pingpong effect in a Broadband Wireless Access (BWA) communication system having a mobile subscriber station (MSS), a serving base station (BS) in communication with the MSS, and a plurality of neighbor BSs being different from the serving BS, the method comprising the steps of: upon detecting a need for performing handover from the serving BS to a target BS selected from the neighbor BSs, changing, by the MSS, its connection from the serving BS to the target BS; after changing its connection from the serving BS to the target BS, detecting, by the MSS, occurrence of the pingpong effect while performing a network re-entry operation with the target BS; sending, by the MSS, to the target BS, a report indicating that the MSS will change its connection from the target BS to the serving BS due to the occurrence of the pingpong effect sending, by the target BS, to the serving BS, a notification indicating that the MSS will change its connection from the target BS to the serving BS, based on the report from the MSS; allocating, by the serving BS, a contention-free-based ranging resource to the MSS based on the notification from the target BS; and connecting, by the MSS, to a communication service with the serving BS using the contention-free-based ranging resource.