Abstract :
Quality-of-service (QoS) routing is the key to support multimedia services in wireless multihop networks. The goal of QoS routing is to find satisfactory paths that support the end-to-end QoS requirements of the multimedia flows. Previous work has demonstrated a framework for supporting QoS routing in mobile ad hoc networks, where two novel mechanisms for dynamic channel assignment, called the minimum-blocking and bandwidth-reallocation channel-assignment (MBCA/BRCA) algorithms, were proposed. MBCA/BRCA are on-demand channel assignment methods that reactively provide a differentiated service treatment to multimedia traffic flows at the link level using novel techniques for end-to-end path QoS maximization. Efficient QoS routing is then accomplished by giving the routing mechanism access to QoS information, thus coupling the coarse grain (routing) and fine grain (congestion control) resource allocation. In this paper, the specifics and individual mechanisms of the MBCA/BRCA algorithms are presented, whereas their effectiveness and the manner in which they interact in order to contribute to the overall protocol performance is examined and documented. The system performance is studied through simulations experiments under various QoS traffic flows and network scenarios. The protocol´s behavior and the changes introduced by variations on some of the mechanisms that make up the protocol is further investigated. As demonstrated, the MBCA/BRCA methods are able to increase system´s aggregate traffic by 2.8 Kb/s, on average, comparing to a non-MBCA/BRCA dynamic channel-allocation scheme.
Keywords :
ad hoc networks; bandwidth allocation; channel allocation; mobile radio; multimedia communication; optimisation; quality of service; resource allocation; telecommunication network routing; telecommunication traffic; 2.8 Kbit/s; QoS routing support; bandwidth-reallocation channel-assignment method; dynamic channel-allocation scheme; end-to-end path QoS maximization; minimum-blocking channel-assignment method; mobile ad hoc network; multimedia network; multimedia service; quality-of-service; resource allocation; traffic flow; wireless multihop networks; Ad hoc networks; Communication system traffic control; Mobile ad hoc networks; Performance analysis; Protocols; Quality of service; Routing; Spread spectrum communication; Telecommunication traffic; Traffic control; DCA; Distributed channel assignment; MANETs; QoS; QoSR; mobile ad hoc networks; quality of service; quality-of-service routing;
