Ad hoc networking by Stefano Basagni; et al

By Stefano Basagni; et al

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A QoS model outlines the overall Quality of Service goals and architecture for implementing a given application or service. These objectives may include link capacity, latency, link utilization percentage, throughput, bandwidth and energy consumption, and so on. 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.

Network Security. Mobile wireless networks are generally more vulnerable to information and physical security threats than fixed-wireline networks. The use of open and shared broadcast wireless channels means nodes with inadequate physical protection are prone to security threats. In addition, because a mobile ad hoc network is a distributed infrastructureless network, it mainly relies on individual security solution from each mobile node, as centralized security control is hard to implement. 9.

In general, they show that the proactive protocols are sufficient for a small-scale static network, whereas reactive protocols such as DSR and AODV normally work well for medium-size networks with moderate mobility. For large-scale networks with hundreds or thousands of nodes, in which layering and partitioning are essential in ensuring network performance, structure-based or hybrid protocols are more appropriate. Overall, a good approach in routing protocol design might come from hybrid routing protocols; for example, by using proactive protocols in local zones, while using reactive protocols between zones (ZRP), by using location-aware routing for nodes over long distances when the forwarding node and the receiver are far away, or by incorporating a hierarchical clustering algorithm to AODV to increase scalability.

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