This paper analyzes and evaluates, via simulations, common QoS extensions, like backup route or priority queuing, and proposes some new ones, such as real-time neighbor aware rate control policies or hop-constrained queuing timeouts, to ad hoc routing in IEEE 802.11 mobile ad hoc networks. The paper shows how the performance, using these QoS extensions, of the selected AODV routing protocol improves significantly for connections up to three hops making possible to meet the demands of real-time applications. Moreover, it presents how some common mechanisms like local repair of AODV and RTS/CTS degrade the performance and should not be used in case of real-time traffic.
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