Patent ID: 7389110

Claim:
A method for implementing a handoff for an MT (Mobile Terminal) in a mobile communication system in which at least two BSCs (Base Station Controllers) are connected to at least two BTSs (Base Transceiver Systems) through a RAN (Radio Access Network) having a planar structure, each of the BSCs controls at least one BTS, and each of the BTSs as a source BTS provides information about an anchor BSC that is serving a call to an MT at a call setup, comprising the steps of: storing anchor BSC information received from a source BTS at a call setup; transmitting to a target BTS a first Handoff Request message including the anchor BSC information, a message header, a message trailer, a control field, and MT identification, when a handoff is requested; and processing a call through the target BTS upon receipt from the target BTS of a response signal; and transmitting, by the anchor BSC, a data to the target BTS, when the anchor BSC receives a second Handoff Request message including MT and BTS identiflcations, a message header, a message trailer, and a control field.