Service differentiation is the key to today's Internet QoS. However the assumption of static network topology and stability of links make the direct application of DiffServ in mobile ad hoc networks unfeasible. This paper presents admission control and service differentiation mechanism that works only in network layer and does not require any feed back from other layer. It works with ad hoc routing protocol to perform required tasks and can be incorporated in any kind of reactive routing protocols for mobile ad hoc networks like AODV, DSR etc. Moreover it does not require maintaining any state information over the whole route.
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