Multipath QoS routing of supporting DiffServ in mobile ad hoc networks

Future mobile ad hoc networks (MANETs) are expected to be based on all-IP architecture and be capable of carrying multitudinous real-time multimedia applications such as voice, video and data. It is very necessary for MANETs to have a reliable and efficient routing and quality of service (QoS) mechanism to support diverse applications which have varying and stringent requirements for delay, jitter, bandwidth, packets loss. Providing multipath routing is beneficial to avoid traffic congestion and break in communication in MANETs where routes are disconnected frequently due to mobility. Differentiated Services (DiffServ) which have simple, efficient and scalable characteristics can be used to classify network traffic into different priority levels and apply different scheduling and queuing mechanisms to obtain QoS guarantees. In this paper, we propose a practical node-disjoint multipath QoS routing protocol of supporting DiffServ (MQRD), which provides low routing overhead and end-to-end QoS support. Simulation results show that MQRD achieves better performance in terms of packet delivery ratio and average delay.