Patent ID: 7953052
Filing Date: 2011-05-31
Classification: H04W

Abstract:
1. A handoff method in a communication system where base stations (BSs) providing different radio access interfaces to a mobile station (MS) are connected to a network through routers, comprising the steps of: a) deciding a handoff from a first BS to a second BS for an MS that receives service data of a predetermined network layer from the first BS; b) establishing a link layer connection between the MS and the second BS and providing network layer information containing a network layer address of the second BS or a network layer address of a router connected to the second BS to the MS by the second BS; c) detecting movement of the MS in the network layer during the link layer connection establishment; d) conducting handoff negotiations between the first and second BSs if the movement of the MS in the network layer is detected; e) determining whether the handoff is available according to the negotiations; f) performing mobility management control considering movement of the MS if the handoff is available; g) transmitting the service data of the network layer to the MS in a network path reset to the second BS by the mobility management control; and h) releasing a link layer connection between the MS and the first BS if the movement of the MS in the network layer is detected, wherein step c) comprises the steps of: wherein step d) comprises the steps of: