CSMA/ECA is a contention protocol that makes it possible to construct a collision-free schedule by using a deterministic backoff after successful transmissions. In this paper, we further enhance the CSMA/ECA protocol with two properties that allows to fairly accommodate a large number of contenders in a collision-free schedule. The first property, called hysteresis, instructs the contenders not...

Communication protocols and techniques are often evaluated using simulation techniques. However, the use of formal modeling and analysis techniques for verification and evaluation in particular for Wireless Sensor Networks (WSN) becomes a necessity. In this paper we present a formal analysis of the backoff procedure integrated in the medium access control protocol named ECo-MAC designed for WSN...

Fair allocation of bandwidth and maximization of channel utilization are two important issues when designing a contention-based wireless medium access control (MAC) protocol. However, achieving both design goals at the same time is very difficult, and has not yet been addressed elsewhere. In this paper, we study this challenging problem, particularly for data communications in IEEE 802.11 wirel...

Emerging multimedia applications for sensor networks require the co-existence of different types of traffic with different QoS provisions in terms of latency and throughput. Prioritization based service differentiation mechanisms are applied in all layers of communication to satisfy the QoS requirements of each traffic class. The prioritization in the contention is one of these differentiation ...

The throughput and reliability indexes of traffic information single-hop broadcasting protocol is related to contention windows valve and contending nodes in vehicular ad hoc networks. In this paper, a theoretical analytic model of single-hop broadcasting protocol is proposed to analysis the relationship between the throughput and the reliability, and to find suitable contention window value wh...

Cognitive radio networks (CRNs) have been widely used in various applications for effective spectrum utilization recent years. It is essential to fend off the growing demand this finite natural resource next-generation communications. In CRNs, detecting activity of primary user requires opportunistic sensing efficient usage available spectrum, which a limited and exquisite resource. Thus, CRNs ...

IEEE 802.11e network standard supports the quality of service through EDCA technique. This technique does not fulfill the requirements of QoS. So in this paper, we have proposed modified EDCA technique to improve the QoS in same IEEE 802.11e networks. In this approach, we have changed Contention Window size. The proposed method is implemented in NS2 and also this should compare with conventiona...

In the advent of emerging information super highway, voice over Internet Protocol has become a vital service with the demand for high quality of requirements in Wireless Local Area Network(WLANs). The IEEE 802.11e Standard has been recently introduced to mark the Quality of Service (QoS) competence in the ever evolving wireless local area networks. This 802.11e brings contention window, based o...