A Spatial Group-Based Multi-User Full-Duplex OFDMA MAC Protocol for the Next-Generation WLAN

Abstract

<jats:p>The Wireless Local Area Network (WLAN) has become a dominant piece of technology to carry wireless traffic for Internet of Things (IoT). The next-generation high-density WLAN scenario is very suitable for the development trend of the industrial wireless sensor network. However, in the high-density deployed WLAN scenarios, the access efficiency is low due to severe collisions, and the interference is diffused due to the scattered locations of the parallel access stations (STAs), which results in low area throughput, i.e., low spatial reuse gain. A spatial group-based multi-user full-duplex orthogonal frequency division multiple access (OFDMA) (GFDO) multiple access control (MAC) protocol is proposed. Firstly, the STAs in the network are divided into several spatial groups according to the neighbor channel sensing ability. Secondly, a two-level buffer state report (BSR) information collection mechanism based on P-probability is designed. Initially, intra-group STAs report their BSR information to the group header using low transmission power. After that, group headers report both their BSR information collected from their members and inter-group interference information to the access point (AP). Finally, AP schedules two spatial groups without mutual interference to carry on multi-user full duplex transmission on the subchannels in cascading mode. The closed-form formulas are theoretically derived, including the number of uplink STAs successfully collected by AP, the network throughput and area throughput under saturated traffic. The simulation results show that the theoretical analysis coincide with the simulation results. The system throughput of the GFDO protocol is 16.8% higher than that of EnFD-OMAX protocol.</jats:p>

An Efficient Backoff Procedure for IEEE 802.11ax Uplink OFDMA-Based Random Access

“…The second most popular topic is the coexistence of random access and scheduled access [11]- [15]. Other works propose novel MAC protocols [16], [17], extend UORA to provide deterministic channel access [18]- [20], introduce efficient channel schedulers [21], or modifying UORA version to support Vehicle-to-Anything (V2X) communication [25]. These are mainly theoretical studies verified by simulations.…”

“…A popular way to improve UORA efficiency is by grouping stations into non-interfering clusters [3]- [6], [10], [17]. Other works propose to modify the backoff mechanism [7], [8] (i.e., they propose to add additional backoff or even resign from performing backoff) or OBO control mechanism [2].…”

“…Two papers propose novel MAC protocols [16], [17]. Zhang et al [16] implement an OFDMA-based joint reservation and coordination MAC (OJRC-MAC).…”

Dynamic Topology Reconstruction on Next Generation WLAN Using Spatial Reuse Gain by DBSCAN Clustering Algorithm

“…A spatial group-based multi-user full-duplex OFDMA MAC protocol (GFDO) [16] is a recent MAC protocol which is a combination of power regulator and spatial alliance technology. This paper illuminate low in effectiveness and obstructions dis- [15] Asymmetric Distributed MU OFDMA Inter-node interference assortment EnFD-OMAX [15] Asymmetric Distributed Refining the success possibility and the spectrum proficiency semination issue in WLAN.…”

Industrial Wireless Sensor Networks: Protocols and Applications

“…The next two papers are relevant to Media Access Control (MAC) sub-layer. To provide a remedy for the joint problem of the low-access efficiency and the interference diffusion in high-density deployment of IWSNs, the second paper [ 2 ] on MAC (Media Access Control) proposes a spatial group-based multi-user Full Duplex OFDMA (GFDO) protocol. While the theoretical analysis derives the average number of nodes in an access channel, system saturation throughput, and area throughput, the simulation in an NS2 simulator supports the theoretical analysis and shows the efficiency of the proposed protocol.…”