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In this paper, a contention resolution backoff algorithm termed Utility Based Backoff (UBB) is proposed for initial ranging procedure in IEEE 802.16e based WiBro (Wireless Broadband) system. In UBB algorithm, whenever an active Subscriber Station (SS) experiences a collision during ranging request transmission, it accomplishes its new contention window size based on the utility (satisfaction) upon...
It has been recently suggested by Jiang and Walrand that adaptive carrier sense multiple access (CSMA) can achieve optimal utility without any message passing in wireless networks. In this paper, a generalization of this algorithm is considered. In the continuous-time model, a proof is presented of the convergence of these adaptive CSMA algorithms to arbitrarily close to utility optimality, without...
The Distributed Coordination Function (DCF) in the IEEE 802.11 protocol is a random access scheme based on the carrier sense multiple access with collision avoidance (CSMA/CA). In recent years, there have been numerous research on the performance analysis and model of DCF under the assumption that the transmission queue is always nonempty (i.e. saturation state). In this paper, we propose a dynamic...
In order to ensure an efficient network control for mobile ad hoc networks, nodes are usually aggregated into clusters to provide a convenient framework. However, an important issue on how to properly assign channels over a multi-cluster structure has not been studied in depth. In this paper, we first propose a new clustering algorithm to facilitate subsequent channel assignment. Each cluster has...
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