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Wireless Communications and Mobile Computing
Volume 2018, Article ID 6931765, 11 pages
https://doi.org/10.1155/2018/6931765
Research Article

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

School of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Correspondence should be addressed to Jianjun Lei; nc.ude.tpuqc@jjiel

Received 5 September 2017; Revised 29 December 2017; Accepted 4 January 2018; Published 7 February 2018

Academic Editor: Zhaolong Ning

Copyright © 2018 Jianjun Lei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.