A new link layer protocol, quality of service hybrid multi channel protocol (QoS–HMCP), that takes into account the need for QoS support in multi-channel multi-interface wireless mesh networks (MCMI–WMNs) is proposed in this paper. QoS–HMCP protocol retains most properties of enhanced distributed channel access (EDCA) mechanism, defined by the 802.11 standard, as well as the basic mechanisms of...

The IEEE 802.11e standard has been introduced to support service differentiation for wireless local area networks. In wireless multi-hop networks, the performance of IEEE 802.11e EDCA has to confront with some practical problems such as unsaturation traffic and hidden node problem. Hence, this problem has attracted numerous studies in recent years, in which several investigations use analytic m...

Wireless Local Area Networks (WLAN)s are today common for access to Internet; well-known and used is IEEE 802.11 standardized technology. Some drawbacks of the standardized distributed medium access scheme, Distributed Coordination Function (DCF) has resulted in considerations made to extend the DCF from single-hop communications to multi-hop. Multihopping has the potential to reduce energy con...

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In this paper the authors present a simulation study of five different ring networks with hidden and exposed nodes in which the IEEE 802.11 EDCA function is used as the MAC protocol. The presented analysis is crucial for understanding how the theoretically simple ring topology can be degraded by the presence of hidden and exposed nodes. Configurations with equal and mixed priorities are conside...