METHOD FOR HARDENING SOFT AND SOFTER HANDOFF USING DIRECT BASE STATION TO BASE STATION CONNECTION IN CODE DIVISION MULTIPLE ACCESS SYSTEM

摘要

PURPOSE: A method for hardening soft/softer handoff is provided to prevent calls from being concentrated on a specific radio resource by making a source base station refer to radio resource information of a target base station to request other resource assignments, and by making the target base station suggest radio resources for being assigned to the source base station. CONSTITUTION: A source base station requests an A7-handoff to a target base station when a mobile station moves to the target base station from the source base station. The target base station decides whether radio resource assignments requested by the source base station fail, or whether a suggestion for assigning other radio resources has to be done. If the target base station fails to assign the radio resources or transmits information for assigning other radio resources, the target base station examines self radio resource information. The target base station transmits an A7-handoff request Ack to the source base station. The source base station designates radio resources to request a handoff to the target base station. The target base station initializes an A3 connection to transmit an A3-connection message to the source base station. The source base station completes the A3-connection to transmit a response message. An architecture B system transmits the response message for the A7-handoff request Ack, and an architecture A system transmits the response message after transceiving frames. The source base station transmits a handoff direction message to the mobile station. The mobile station performs a handoff process to transmit a handoff completion message to the source base station.