Patent ID: 7787422

Claim:
A handover method of a mobile station (MS) in a mobile communication system including MSs, radio access stations (RASs), and access control routers (ACRs), each of which includes an IEEE 802.16 standard-based medium access control (MAC) layer and an Internet protocol version 6 (IPv6)-based IP layer, the method comprises: gathering IP network information of a neighbor RAS through a message exchange with a previous ACR; determining a target RAS for handover based on the gathered IP network information of the neighbor RAS gathered from the previous ACR; after the target RAS is determined, tunneling, by the previous ACR, data for targeting the MS to the target RAS; and receiving the tunneled data from the target RAS, wherein the target RAS determining comprises selecting the target RAS through MAC message exchange between the MS and the previous RAS, if the target RAS is selected, generating a target RAS select primitive and forwarding the target RAS select primitive to an IP layer, sending, by the MAC layer of the MS, a Handover Initiation MOB_HO-IND message to the previous RAS; upon receipt of the MOB_HO-IND message, ending, by the previous RAS, service to the MS, upon receipt of the target RAS select primitive, sending, by the IP layer, a fast binding update FBU message to the upper node of an ACR connected to the previous RAS, and upon failure to receive a fast binding acknowledgement FBAck message, transitioning from a predictive mode to a reactive mode.