Sylwia Antonina Romaszko

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IEEE 802.11 [1] has become the standard for Wireless LAN’s both in infrastructure and in ad hoc mode. The standard specifies the medium access control mechanism, Distributed Coordination Function (DCF). Deploying the 802.11 DCF in wireless multi-hop networks leads to inefficient utilization of bandwidth and energy due to many unnecessary collisions. To(More)
The IEEE DCF 802.11, currently used as wireless local area networking standard, wastes bandwidth capacity and energy resources due to many collisions. To attenuate these problems we propose a neighbour and energy aware contention avoidance MAC protocol (NEWCAMac). The NEWCAMac protocol defines novel algorithms to estimate a minimum and maximum contention(More)
We propose the "bounds selection-dynamic reset algorithm" (sB-DRA) protocol for wireless ad hoc LANs. The sB-DRA consists of the selection/adjustment of the contention window (CW) interval (selection Bounds algorithm-sB from our previous work (Romaszko and Blondia, 2006)) and the resetting of the contention window value dynamically after a dropped packet or(More)
In this paper we study a novel distributed rendezvous protocol for cognitive radio networks (CRNs), which is based on a grid quorum system, hence we call it the gQ-RDV protocol. A paper tackles with an asymmetric channel view problem rarely investigated due to its complexity. Hence, the objective of the paper is twofold. Different grid-based quorum(More)
Multihop mobile wireless networks have drawn a lot of attention in recent years thanks to their wide applicability in civil and military environments. Since the existing IEEE 802.11 distributed coordination function (DCF) standard does not provide satisfactory access to the wireless medium in multihop mobile networks, we have designed a cross-layer(More)