计算机工程 ›› 2021, Vol. 47 ›› Issue (1): 182-187,195.doi: 10.19678/j.issn.1000-3428.0056994

• 移动互联与通信技术 • 上一篇    下一篇

IEEE 802.11ax密集WLAN的干扰协调策略

徐晓锋1, 张闽1, 钱晨喜1, 陈清华1,2   

  1. 1. 浙江工业大学 计算机科学与技术学院, 杭州 310014;
    2. 温州职业技术学院 信息技术系, 浙江 温州 325035
  • 收稿日期:2019-12-23 修回日期:2020-01-29 发布日期:2020-02-12
  • 作者简介:徐晓锋(1994-),男,硕士,主研方向为下一代无线局域网;张闽、钱晨喜,硕士;陈清华(通信作者),副教授、博士。
  • 基金项目:
    浙江省教育厅一般科研项目(Y202044857);温州市基础性科研项目(G20200017,G20180006)。

Interference Coordination Strategy for IEEE 802.11ax Dense WLAN

XU Xiaofeng1, ZHANG Min1, QIAN Chenxi1, CHEN Qinghua1,2   

  1. 1. School of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310014, China;
    2. Department of Information Technology, Wenzhou Polytechnic, Wenzhou, Zhejiang 325035, China
  • Received:2019-12-23 Revised:2020-01-29 Published:2020-02-12

摘要: 无线局域网(WLAN)中设备数量的指数级增长,导致激烈的信道争用及严重的同频干扰。当运行在同一频段上的两个WLAN在彼此感知范围内时,使用先监听后发送的分布式信道接入方式会引起资源浪费,降低网络吞吐率。提出一种密集WLAN场景下的干扰协调策略。根据IEEE 802.11ax中的基本服务集颜色对站点进行分组,提出协调交替目标唤醒时间策略(CAT),安排不同组内站点在不同的时间接收数据,从而避免信道争用,最小化干扰,同时通过优化下行数据包大小提高网络吞吐率。仿真结果表明,当两个WLAN距离很近时,CAT方案能够保证网络吞吐率。此外,在考虑误码率的情况下,吞吐率并非随着数据包的增大单调递增,而是存在一个阈值,超过该阈值后网络吞吐率即呈下降趋势。

关键词: 无线局域网, 同频干扰, 目标唤醒时间, 无线局域网控制器, 基本服务集颜色

Abstract: The exponential growth of devices in Wireless Local Area Network(WLAN) has resulted in intense channel access contention and severe inter-frequency interference.When two WLANs are running on the same frequency band as well as within the sensing range of each other,the listen-before-transmit approach for distributed channel access will lead to a waste in resources and a reduction in network throughput.To address the problem,this paper proposes an interference coordination strategy for dense WLAN.The strategy uses the Basic Service Set(BSS) coloring in IEEE 802.11ax to divide the stations into different groups,and uses an Coordination Alternating Target Wake Time(TWT) strategy(CAT) to arrange different stations within a group to receive packets asynchronously,which reduces channel contention and minimizes interference.Then the size of downlink data packets is optimized to improve network throughput.The simulation results show that,even when the two WLANs are very close,the CAT scheme guarantees the network throughput.In addition,in the case of considering the bit error rate,the throughput does not increase monotonically with the number of data packets,and a decrease in network throughput is observed after it exceeds a threshold.

Key words: Wireless Local Area Network(WLAN), co-channel interference, target wake time, WLAN Controller(WLC), Basic Service Set(BSS) coloring

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