Abstract
In Wireless Local Area Networks (WLANs), cochannel deployment can bound channel access delay and improve network capacity due to mitigating the collision and interference among different Access Points (APs). In this paper, we present a network model and an interference model for multiple APs cochannel deployment and propose a channel assignment mechanism which formulates the channel assignment problem into a time slot allocation problem. Meanwhile, we assign the channel based on the vertex coloring algorithm and make extra polls by utilizing the time slot reservation strategy to improve the channel assignment. Furthermore, we optimize the polling list of APs through classifying the clients to improve the channel utilization. The simulation results show that our proposed algorithm can improve the performance in terms of network throughput, transmission delay, and packet loss rate compared with the DCF (Distributed Coordination Function) and TMCA algorithms.
Highlights
In recent years, with the development of wireless technologies, the demand of Wireless Local Area Networks (WLANs) has risen and its deployment has become denser and denser
In high density and multi-Access Points (APs) WLANs, high collision probability leads to low efficiency of channel access, and too much time is spent in dealing with collision for retransmission [4]
We propose a collision-free channel assignment algorithm to improve the aggregated throughput by utilizing cochannel deployment, which consists of three procedures: (1) conducting a basic channel assignment by vertex coloring algorithm that determines the minimum number of time slots; (2) constructing an improved channel assignment by making extra polls for APs to improve the channel utilization; (3) classifying the clients to optimize the polling list of APs and reduce empty polls
Summary
With the development of wireless technologies, the demand of WLANs has risen and its deployment has become denser and denser. PCF provides contention-free channel access among clients, it is mainly designed to be used in single-AP network and cannot be directly used in multi-AP WLANs. In this paper, we propose a multi-AP deployment framework, which lets all APs operate in the same channel and coordinates them to obtain the appropriate channel, reducing the system interference.
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