A study of network assisted handover mechanism based on the terminal mobility in wireless ATM network

Abstract

In this thesis, we propose the NAHO(Network Assisted Handover) for the mobile terminal. In the conventional scheme of handover request, the withdrawal of terminal may occur because handover request is performed based on fixed signal level without considering network load and terminal mobility. Proposed scheme offers the minimization of withdrawal and handover blocking probability by means of the handover request of terminal based on the network load and terminal mobility. Conventional handover scheme has the sequential procedure that network performs resource check and path rerouting on the handover by MT(Mobile Terminal). Proposed handover scheme pre-processes the resource check before the handover request by predicting the handover request time so that handover latency can be reduced. Moreover, path optimization is executed after the completion of handover in order to reduce handover latency. The reduction of handover latency prevents the dropping of service by minimizing backward handover blocking. In summary, we propose the prediction of handover request time and decision method based on terminal mobility, validating the performance of proposed scheme considering various cases of simulation.