Abstract:
Integration of ad hoc mode into cellular system has enhanced the cellular communication in many ways.But for network designers, many challenges has aroused due to this merging of two types of networks.As ad hoc link is used, multi-hop handover is inevitable. There are many challenges in Multi-hop handover. Generallyhandover latency, call dropping and call blocking increases in many cases of multi-hop handover scenarios. The complexity of handover process, load sharing and resource management are also very critical issues. And most of these issues are not well addressed so far. If link selection is not correct then it leads to untimely termination of calls or frequent handoffs. If the reservation for handover call is more, the blocking of new calls will be more. In the case where reservation for handover call is less handover dropping will be more. So, to keep the call dropping rate within a tolerable range, there must be a scheme for reserving feasible minimum bandwidth for handover calls. There is no such scheme where the issue of selecting a destination node for handover is addressed. Moreover we must make reservations in such a way that it should be good enough to meet certain handover dropping (HOD) requirement and certain call blocking threshold.In this project we propose a scheme to assist handover in cellular network. To achieve our aforementioned goal we propose a small scale radio network. This network uses the self organizing feature of the ad hoc mode. Ad hoc mode is an additive component to the cellular system which does not impair the conventional system but creates extra opportunities to be connected with thebase station. The scheme provides an auxiliary way to complete handover in cellular system. Moreover, this scheme enables each base station to find the feasible minimum bandwidth reservation for handoff calls based on the knowledge of adjacent cells’ traffic information. Due to the use of multi-hop connections, our scheme can apparently alleviate the reservation requirement and lower the call blocking rate while retaining higher spectrum efficiency. We further provide a framework for information exchange among adjacent cells, which can dynamically balance the load among cells. Through this study, we demonstrate how we can utilize ad hoc mode in cellular systems to significantly improve the handoff performance.This scheme can reduce handover latency,handover call dropping and call blocking. Thus, better handoff performance compared to the single hop cellular system can be achieved.
