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By Stefano Basagni; et al

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QoS routing refers to the discovery and maintenance of routes that can satisfy QoS objectives under given the resource constraints, whereas QoS signaling is responsible for actual admission control, and scheduling, as well as resource reservation along the route determined by QoS routing or other routing protocols. Both QoS routing and QoS signaling coordinate with the QoS MAC protocol to deliver the QoS service required. Much research has been done in each of these component areas [130–133]. A first attempt at QoS modeling has been presented in [135], where a Flexible QoS Model for MANET (FQMM) based on both IntServ and Diffserv is proposed.

It also utilizes physical and link-layer statistics to conserve power, while compensating for the propagation path loss, shadowing, fading, and interference effects. Energy-efficiency comparison of a number of MAC-layer protocols [26] examines the effectiveness of various media acquisition strategies in the presence of contention. 4. TECHNICAL CHALLENGES AND RESEARCH OVERVIEW 29 ventional energy-conserving link-layer protocols are designed for centralized environments where resource-rich base stations are used to control node communication and reduce contention via careful scheduling and traffic buffering [24].

The FSR protocol [75, 76] is also an optimization over Link State algorithm using the fisheye technique. In essence, FSR will propagate link state information to other nodes in the network based on how far away (defined by scopes, which are determined by number of hops) the nodes are. The protocol will propagate link state information more frequently with nodes that are in a closer scope as opposed to ones that are further away. This means that a route will be less accurate the further away the node is, but once the message gets closer to the destination, the accuracy increases.

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