Utility optimization of grouping-based uplink OFDMA random access for the next generation WLANs
- PDF / 1,989,112 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 53 Downloads / 167 Views
(0123456789().,-volV)(0123456789(). ,- volV)
Utility optimization of grouping-based uplink OFDMA random access for the next generation WLANs Annan Yang1 • Bo Li1 • Mao Yang1 • Zhongjiang Yan1 • Yi Xie1 Accepted: 23 October 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a grouping-based uplink orthogonal frequency division multiple access (OFDMA) random access method is studied which can improve users’ satisfaction in the next generation wireless local area networks (WLANs). The next generation WLANs standard, IEEE 802.11ax introduces a random access mechanism, uplink OFDMA random access (UORA), to allow users to access channel randomly. Although UORA has the advantages of low signaling overhead, no need to report uplink transmission requirements, it does not have any characteristics to improve users’ satisfaction. Because the AP can’t allocate resources to users adopting UORA, some users’ quality of experience (QoE) will decline greatly. In this paper, a grouping-based UORA (G-UORA) method is proposed. The AP determines the number of groups, and then clusters users to different groups according to their utility. Then, the AP assigns resources to these groups to maximize the total utility of all users. We present a theoretical utility prediction model of G-UORA and propose the corresponding resource allocation algorithm based on utility. According to simulation results, the algorithm achieves better users’ satisfaction and fairness than the traditional UORA mechanism in IEEE 802.11ax and the user utility gain is 1.6 times. Therefore, the proposed method has greater practical significance. Keywords Wireless local area network (WLAN) Orthogonal frequency division multiple access (OFDMA) Uplink OFDMA random access (UORA) Grouping-based Utility
1 Introduction
& Mao Yang [email protected] http://jszy.nwpu.edu.cn/en/yangmao.html Annan Yang [email protected] Bo Li [email protected] http://www.wnclab.com Zhongjiang Yan [email protected]; [email protected] http://jszy.nwpu.edu.cn/en/zhjyan.html Yi Xie [email protected] 1
School of Electronics and Information, Northwestern Polytechnical University, No.561, Building of School of Electronics and Information, No.1 Dongxiang Road, Chang’an district, Xi’an 710129, Shaanxi, China
In the traditional wireless local area networks (WLANs) standard series IEEE 802.11, each user uses carrier sense multiple access/collision avoidance (CSMA/CA) mechanism to access channel. The common characteristic of traditional IEEE 802.11 protocols (802.11a, 802.11b/g, 802.11e, 802.11ac, etc) of WLANs is that only one user can compete for channel and access successfully. In recent years, the next generation WLANs, IEEE 802.11ax published the draft 3.0 [1]. Multi-user media access control (MU-MAC) mechanism proposed in the draft is the most important innovation of the media access control (MAC) layer in the IEEE 802.11ax. For MU-MAC mechanism, the whole channel is divided into several orthogonal subcarriers, and differ
Data Loading...
