METHOD FOR PERFORMING INTER-PDSN HIGH-SPEED HARD HAND-OFF THROUGH LINK SETUP BETWEEN BSCS THROUGH MSC

摘要

PURPOSE: A method for performing an inter-PDSN(Packet Data Serving Node) high-speed hard hand-off through a link setup between BSCs(Base Station Controllers) through an MSC(Mobile Switching Center) is provided to perform a communication through the link setup between the BSCs through the MSC in an active packet session mode in an IMT-2000(International Mobile Telecommunications-2000) wireless packet mobile communication network and offer a packet data service in a high speed without losing data. CONSTITUTION: An MSC(111) selects a T(Target)-BSC(107) having an available wireless channel from a cell list, inserts a PANID(Previous Access Network ID) and a hard hand-off indicator into a hand-off request message, and transmits the hand-off request message to the T-BSC(107)(S203). The T-BSC(107) receives the hand-off request message, assigns a suitable idle wireless resource, and sets an ATM(Asynchronous Transfer Mode)-based link channel between an S(Source)-BSC(103) and the T-BSC(107) through the MSC(111)(S205). The T-BSC(107) transmits a hand-off request acknowledgement message including wireless channel information to the MS(111) so that an MS(101) performs a tuning to the corresponding wireless channel and starts a T9 timer to wait for receiving a signal transmitted from the MS(101)(S207). The MSC(111) receives the hand-off request acknowledgement message, prepares the switching of a call from the S-BSC(105) to the T-BSC(107), and transmits a hand-off command including wireless channel information received from the T-BSC(107) to the S-BSC(103)(S209). The S-BSC(103) transmits a GHDM(General Hand-off Direction Message) or a UHDM(Universal Hand-off Direction Message) to the MS(101), and starts a Twaitho timer for admitting that the MS(101) is returned to the S-BSC(103)(S211). The MS(101) transmits an MS acknowledgement order message to the S-BSC(103)(S213). The S-BSC(103) transmits a hand-off commenced message to the MSC(111) for informing that the MS(101) is instructed to be moved to a channel of the T-BSC(107)(S215). If the MS(101) acquires synchronization using a reverse traffic channel frame or preamble data and completes a hard hand-off procedure, the MS(101) transmits a hand-off completion message to the T-BSC(107)(S217). The T-BSC(107) receives the hand-off completion message and transmits a BSC acknowledgement order message to the MS(S219).