Method for Fast Inter-PDSN Soft Handoff Using Direct Communication Between BSCs

1. the art that the invention defined in the claims Active (Active) will to a method that allows to provide real-time data services that are not high-speed / high quality loss in the packet mode, perform the high-speed lossless Intra-PDSN soft handoff. 2. The technical problem to be solved by the invention, Performing from the S-BSC by replacing the hard handoff to the T-BSC in soft handoff the other hand, maintains the S-BSC as anchor (Anchor) that provides a packet data service in an active (Active) mode while the rest (Dormant ) mode by setting a link of a packet access network in an active (active) mode to reduce the time delay in the handoff execution process providing perform Intra-PDSN hand-off method for providing uninterrupted packet data service to prevent loss of packet data. 3. Resolution of the subject matter of the invention, The source base station controller (S-BSC) and a target base station controller (T-BSC) between the direct channel by setting the link to the target base station controller (T-BSC) to the source base station controller (S-BSC) and the Packet Data Serving Node (PDSN) channel for user packet data set to the exchanged second step of performing a handoff between the MS and the S-BSC and the T-BSC between the first step of setting the channel via the S-BSC and the T-BSC and the MS a third step of transmitting or receiving through the link to the PDSN, and the hand-off is complete the fourth step of transmitting or receiving to the PDSN via the MS and T-BSC channel linking the user packet data set to the exchanged between including. 4. An important use of the invention, A wireless packet data service, the mobile communication network used to fight.