Crossed path resolution protocol (COPTER) in wireless ATM

This paper proposes a solution to the problem of crossed path, which may occur when both ends of the connection are mobile hosts (MHs) for wireless ATM networks. Previous studies cover the case when only one MH makes a handoff. To minimize circuit setup cost, most of these studies propose the crossover switch (CX) solution so that parts of the original path can be retained in the new path. This study deals with the case when both MHs make handoffs. In such a case, CX found by one end may not lie on the new path determined by the other end, and a crossed path situation occurs. This paper proposes a protocol to resolve the crossed path problem so that a new path can satisfy the QoS requirement of the virtual connection (VC) when a QoS guaranteed path exists. In addition, this paper solves the "moveback" problem that also exists in a single handoff. The proposed protocol has the best performance with CDMA because of its soft handoff feature. Simulation results reveal the scalability, flexibility and robustness of the protocol. Performance analysis of the protocol is also provided.