| Mobile ad hoc networks consist of wireless mobile nodes which are equal and can operate not only as a host but also as a router. In such networks, there is no any fixed infrastructure. Traditional application is mainly about data in ad hoc networks, guaranteeing the quality of service is crucial with the increasing of diverse multimedia applications such as voice, video. QoS routing is one of key issues to guarantee the quality of service. Most researchers take into consideration single path routing at present. However, multipath routing can provide load balancing, fault-tolerance and higher aggregate bandwidth than single path. Therefore, multipath can satisfy QoS comparing with single path. Most papers are concerned on multipath routing with alternate paths which can't utilize network resources effectively and provide load balancing. Multipath routing in parallel transmitting data on multiple paths simultaneously can help to provide the quality of service for real-time service.In this paper, we study multipath routing in parallel and propose two novel multipath routing simultaneously for different applications based on the current issues at home and abroad. Two protocols mend and extend AOMDV which can find multiple node-disjoint paths. One is multipath traffic allocation based on per-connection (MTA-BPC), we choose the different paths for every connection according to the end-to-end delay, transmitting the real-time traffic which require low packet delay on lowest delay path. Another is multipath traffic allocation based on per-packet (MTA-BPP), the basic idea is that we distribute different number of packets for every path using a per-packet granularity according to their congestion. Our paper simulates MTA-BPC and MTA-BPP protocols in NS2, and compares the performance with AOMDV. Both MTA-BPC and MTA-BPP can reduce the end-to-end delay and improve the packet delivery ratio, a drawback is that MTA-BPC presents no obvious advantage in control overhead. |
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