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Wireless Mesh Networks (WMNs) extend the range of the IEEE 802.11 Wi-Fi beyond the one-hop range. This has made it an attractive research topic given the exponential growth in Wi-Fi portable devices. However, the multi-hop nature of WMNs creates many new challenges, primarily in the Medium Access Control (MAC) layer. Specifically, the IEEE 802.11 Medium Access Control (MAC) layer is designed for a...
This paper presents a novel mathematical model for evaluating the performance of infrastructure wireless local area networks (WLANs) carrying voice and data traffic flows. We evaluate the performance of the access point (AP) flows and of the stations that employ IEEE 802.11 Distributed Coordination Function (DCF) as contention mechanism to access the channel. Metrics as throughput, average delay,...
The exponential backoff algorithm used in IEEE 802.11 does not guarantee short term fairness between flows. We propose an algorithm based on IdleSense where each of N flows tries to transmit every W = 8 N slots; i.e. 8 slots per flow with 7 idle. Each flow adaptively adjusts its contention window W based on the observed proportion of empty slots. One key aspect of Lock Step is setting a deterministic...
In this paper, we propose an adaptive optimization scheme for IEEE 802.11 DCF to enhance the network performance. The scheme is based on the channel sensing result and thus we call it CSTC (channel sensing transmission control). The key idea to approach optimal performance dynamically in our scheme is that the transmission attempt from the DCF is filtered by an adjustable probability P_T, which is...
Nowadays IEEE 802.11 family is the most popular technology amongst wireless protocols including Bluetooth, UWB and WiMAX for wireless services, among which media streaming such as voice over Internet Protocol (VoIP) and IPTV are most demanded with high challenge. To accommodate the QoS issues, EDCA and HCCA functions are defined in IEEE 802.11e. However, EDCA provides QoS based on probability, so...
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