| Summary: | 博士 === 國立交通大學 === 資訊科學與工程研究所 === 101 === Mobile ad hoc network (MANET) can be employed to develop on-demand self-organized network without the support of infrastructure. Therefore, MANET is suitable for certain hard task forces, such as military, emergency rescue, and police. With the development of MANET, P2P solution has been demonstrated to be an efficient technique for the management of wireless ad hoc nodes. P2P-MANET (P2P over MANET) has appeared in this kind of network architecture. However, there are several problems in the integration of P2P applications and mobile environment so far. High packet loss rate, low recovery, and low continuity degrade the performance of P2P-MANET. Currently the existing system is only limited in a single requirement for few particular users. Therefore, we design a cross-layer algorithm to solve the above mentioned problems, and implement a P2P platform to integrate file sharing and media streaming. We improve the methods for buffer, scheduling, and overlay to establish a P2P platform for the high scalability and the support of various P2P applications.
In this research, the cross-layer design integrates P2P overlay and routing layer, and combines P2P forwarding path and hop-by-hop routing path, such that there is the information of routing table in finger table. The characteristics of IPv6 mobile routing is used to achieve overlay proximity, which heightens packet delivery rate, recovery ability, and playback continuity. Due to above characteristics, we call the proposed scheme Generic P2P-MANET System (GPMS). GPMS can reduce both packet failure rate and traffic overhead, which in turn improve quality of service.
First, we survey P2P-MANET algorithms, and design the cross-layer scheme, which is suitable for high scalability and large group of users. Second, we design the buffer, scheduling, and overlay, which is adaptable for all P2P cooperation. Third, we derive the mathematical model or theoretical formula to evaluate latency and overhead. Therefore, we can evaluate the limitation and basis of the performance. Finally, we use a network simulator, OMNet++, to demonstrate the correctness of model and formula. And we configure the parameters and optimize the proposed algorithms depending on the simulation results, which are used to discuss the performance and improvement.
In summary, we propose a cross-layer P2P-MANET protocol, GPMS, which is suitable for all P2P content sharing applications. The proposed scheme can improve packet delivery rate, recovery ability, and playback continuity to develop a media sharing service on mobile environment with affordable cost.
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