摘要
密集WLAN(Wireless Local Area Network,无线局域网)中,大规模站点同时接入信道引起激烈竞争,从而导致网络性能急剧下滑.IEEE工作组着手研发下一代WLAN标准IEEE 802.11ax,该标准结合基于正交频分复用多址技术提出了上行多用户随机接入和广播目标唤醒时间(Target Wake Time,TWT)机制.为降低碰撞和减轻干扰,进一步提高吞吐率和能效,本文结合广播TWT机制提出了一种基于网络密度的改进分组信道接入方案.该方案在原有广播TWT调度方法的基础上,依据网络密度选择不同的休眠决策策略;通过将站点分配在不同TWT服务期来控制同时服务站点数并确定站点分组,在TWT服务期内达到最大化吞吐率的目标,实现高效的信道接入.仿真结果分析表明所提策略具有更高的吞吐率和能效.
In a dense Wireless Local Area Networks(WLANs),a large scale of stations may access the limited channels simultaneously,which leads to a severe deterioration on the overall performance because of collision.Hence,the IEEE task group named ax was established to develop a new amendment of IEEE 802.11 standard,i.e.IEEE 802.11ax,for dense scenarios.The new amendment introduced the orthogonal frequency division multiplexing multiple(OFDMA) technology,OFDMA based random access,and the broadcast target wake time(TWT) mechanism to improve the performance.We propose an improved TWT schedulingscheme(ITSS) to further improve the overall throughput and energy efficiency by leveraging the new capability of multi-user transmission.The ITSS,which is adaptive to network density,utilizes the respective advantages of different listen interval scheduling strategies.Besides,aiming at maximizing the overall throughput during the following TWT service period with effective random access,the ITSS allocates the stations into different TWT service period so as to control the maximum number of simultaneously active stations.Simulation results show that the proposed scheme achieves higher throughput and better energy efficiency.
作者
陈清华
邵剑集
翁正秋
CHEN Qing-hua;SHAO Jian-ji;WENG Zheng-qiu(School of Computer Science and Technology,Zhejiang University of Technology,Hangzhou 310014,China;Department of Information Technology,Wenzhou Polytechnic,Wenzhou 325035,China)
出处
《小型微型计算机系统》
CSCD
北大核心
2021年第4期885-890,共6页
Journal of Chinese Computer Systems
基金
温州市科技局项目(G2020017)资助
浙江省教育厅一般科研项目(Y202044857)资助
国家自然科学基金项目(61772026)资助。
关键词
IEEE
802.11ax
密集无线局域网
目标唤醒时间
正交频分复用多址
随机接入
IEEE 802.11ax
dense wireless local area networks(WLANs)
target wake time(TWT)
orthogonal frequency division multiple access(OFDMA)
random access
