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This paper presents a framework to approximate the distribution of the frame delay in the IEEE 802.11 WLAN. Two schemes are also provided to demonstrate the trade-off between complexity and accuracy. Based on the simulation results, scheme 1 can approximate the delay distribution well and scheme 2 is very fast. For the WLAN networks with delay QoS requirement, this paper provides an efficient method...
The IEEE 802.11 protocol has achieved worldwide acceptance with WLANs with minimum management and maintenance costs. However, IEEE 802.11 can only provide a best effort service and does not support the quality of services (QoS). Furthermore, the performance of the distributed coordination function (DCF) degrades significantly under heavy load due to the increasing time wasted during collision. In...
Many RSS-based vertical handoff algorithms have recently been proposed. However, there are only a few models to evaluate the performance of vertical handoff algorithms and none of the existing models reflect the effect of a doorway on received signal strength (RSS). Considering that RSS from heterogeneous networks cannot be directly compared with each other, we firstly present an effective method...
In this paper, we propose an analytical model to evaluate performances of a wireless network composed by two groups of nodes using two different backoff schemes for channel access. The two different backoff schemes are used for QoS differentiation in term of priority. Our analysis results show that the priority group can have its performances enhanced, in term of saturation throughput and delay, without...
In this paper, we provide a saturation throughput analysis of the IEEE 802.11 protocol at the data link layer by including the impact of both transmission channel and capture effects in Rayleigh fading environment. Impacts of both non-ideal channel and capture effects, specially in an environment of high interference, become important in terms of the actual observed throughput. As far as the 4-way...
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