Patent ID: 7130285
Filing Date: 2006-10-31
Classification: H04W

Abstract:
1. A method for performing a handoff on a concurrent service while a mobile station is concurrently provided with a first service and a second service through a first base station, in a mobile communication system including the mobile station, the first base station connected to the mobile station, a mobile switching center connected to the first base station, and a second base station adjacent to the first base station, the method comprising the steps of: sending a handoff required message from the first base station to the mobile switching center according to signal strength reported from the mobile station, the signal strength exceeding predetermined strength of a pilot signal from the second base station, the handoff required message including service type identifiers indicating service types and resource information indicating radio resources assigned for the respective services; receiving the handoff required message at the mobile switching center, and sending to the second base station a handoff request message including the service type identifiers and the resource information; determining in the second base station whether it is possible to assign radio resources for both the first service and the second service, based on the resource information received from the mobile switching center; sending a first handoff request acknowledge message with the resource information removed from the second base station to the mobile switching center, when it is possible to assign the radio resources for both the first service and the second service; assigning in the second base station a radio resource for any one of the first service and the second service, and sending a second handoff request acknowledge message with the assigned radio resource to the mobile switching center, when it is possible to assign the radio resources one of the first service and the second service; sending the first handoff request acknowledge message from the mobile switching center to the mobile station and forming in the mobile station a communication link to the second base station according to the first handoff request acknowledge message when it is possible to assign the radio resources for both the first service and the second service; and sending the second handoff request acknowledge message from the mobile switching center to the mobile station and forming in the mobile station a communication link to the second base station according to the second handoff request acknowledge message when it is not possible to assign the radio resources for both the first and second service.