An multi-BSS multi-user full duplex MAC protocol based on AP cooperation for the next generation WLAN

一种基于AP协作的多小区多用户全双工MAC协议

School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China

闫中江(1983-), 西北工业大学副教授, 主要主要从事无线网络组网协议设计研究。e-mail: zhjyan@nwpu.edu.cn

Received: 22 October 2020

Abstract

Aiming at the problems of low efficiency of buffer information collection and sharp drop of system throughput caused by the aggravation of conflicts in the multi basic service set (BSS) high density deployment overlap coverage scenario of next generation wireless local access network (WLAN), an access point cooperation based multi-BSS multi-user full duplex multiple access protocol named as CMMFD is proposed. Firstly, a channel resource allocation algorithm for stations (STA) in overlapping coverage area is designed, in which, the access control (AC) equipment allocates the channel resources for all STA in response to buffer state and interference information (BI) according to the proportion of STA in the overlapped coverage area. Secondly, a BI information collection protocol process based on access point (AP) cooperation sending trigger frame is designed to collect all STA information. After receiving trigger frame, STA will access the channel and report BI information in p-probability according to the channel resources allocated by AC. Finally, a multi-BSS multi-user channel resource allocation algorithm based on full duplex is designed. AC allocates channel resources according to all BI information reported by AP, and schedules STA in the multi-BSS to carry out multi-user full duplex transmission over the sub-channel. Simulation results show that the throughput of the CMMFD protocol improves by 29.6%, compared with Mu-FuPlex protocol and EnFD-OMAX protocol.

摘要

针对下一代无线局域网（wireless local access network，WLAN）多小区高密集部署重叠覆盖场景中，冲突加剧所导致的缓存信息收集效率低、系统吞吐量急剧下降的问题，提出一种基于接入点协作的多小区多用户全双工多址接入协议（access point cooperation based multi basic service set multi-user full duplex multiple access protocol，CMMFD）。设计了一种面向重叠覆盖区域站点（station，STA）的信道资源分配算法，该算法中接入控制（access control，AC）设备根据重叠覆盖区域中STA个数的占比，为所有STA分配回复缓存和干扰信息（buffer state and interference information，BI）时所使用的信道资源；设计了一种基于接入点（access point，AP）协同发送触发帧收集所有STA BI信息的协议流程，STA在收到触发帧之后，根据AC分配的信道资源以概率P接入信道回复并汇报BI信息；设计了一种基于全双工的多小区多用户信道资源分配算法，AC根据所有AP上报的BI信息，分配信道资源并调度多小区中STA在子信道上进行多用户全双工传输。仿真结果表明：在多小区重叠覆盖场景下，相比Mu-FuPlex协议，EnFD-OMAX协议，CMMFD协议的系统吞吐量提升了29.6%。