QoS Connectionless Multicast Routing for Mobile Ad Hoc Networks

In this paper we propose a Quality of Service (QoS) connectionless multicast protocol called QMCOM (QoS Multipoint relay Connectionless Multicast) providing QoS for realtime applications in Mobile Ad Hoc Networks. The QMCOM protocol scales with both group size and number of multicast groups. QMCOM builds on the multicast protocol MCOM by the addition of admission control and preemption. The admission control in QMCOM is a probe-based admission control scheme that is able to keep QoS demands of flows in multi-class systems. The preemption mechanism based on Backward Explicit Congestion Notification is able to reduce the QoS degradation of realtime flows. We evaluated the performance of QMCOM protocol in both testbed and simulation. The results show that QMCOM is a good candidate for an efficient QoS multicast protocol in Mobile Ad Hoc Networks.