Learn More
— In this paper, we study two medium access control (MAC) sublayer policies, namely, Schedule After Backoff (SAB) and Schedule Before Backoff (SBB), which offer differentiated services in IEEE 802.11-based wireless networks. Both policies control channel access based on frame priorities. In the SAB policy, each node maintains concurrent backoff instances(More)
— Frame aggregation is one of the several enhancements proposed by IEEE 802.11 Task Group £ to improve channel utilization. However, a static assignment of aggregate size may result in the following performance trade-off: a small value might be insufficient to mitigate the transmission overheads, thereby nullifying the whole purpose of frame aggregation;(More)
Cognitive radios (CR) have the ability to dynamically adapt to local spectrum availability. In a network comprised of CR-enabled devices, layer-2 auto-configuration involves determining a common set of channels to facilitate communication among participating nodes. This is a unique challenge as nodes in the CR network may be unaware of (a) their neighbors(More)
Figure 1: Sample network after cluster formation We present a cluster-based network control mechanism in which the underlying network is divided into disjoint clusters of nodes (fig. 1). When number of clusters is one, the mechanism behaves like fixed-alternate path routing; when equal to number of nodes, it becomes adaptive routing. Clusters consist of(More)
  • 1