Method for performing handover to reduce interruption time

摘要

A method for performing handover to reduce an interruption time is disclosed. A method for performing handover using a variable uplink grant time comprises transmitting a handover request message to a base station, receiving a handover response message from the base station, the handover response message including an uplink grant time, and receiving an uplink grant from the base station if the uplink grant time comes, and transmitting a handover indication message to the base station. Thus, an unnecessary interruption time during hard handover can be reduced by efficiently improving use of an action time, and an action suitable for a frame structure of the IEEE 802.16m can be performed.

主权项

1. A method for performing handover at a mobile station of a wireless communication system, the method comprising:
transmitting a first message for requesting handover to a base station;receiving a second message from the base station in response to the first message, the second message including information on a first time duration, information on an offset and information on a plurality of target base stations, wherein the offset is a delay time in frame units;
transmitting a third message including information of a selected target base station among the plurality of target base stations to the base station before expiration of a second time duration; and receiving a fast ranging information element from the selected target base station for handover at a time determined based on the first time duration, wherein data communication with the base station is stopped at expiration of the second time duration, and wherein the second time duration is derived from the information on the first time duration and the information on the offset.