Exploiting CSMA/ECA and Adaptive Sensitivity Control for Simultaneous Transmit and Receive in IEEE 802.11 WLANs

TL;DR

This paper proposes a novel method combining CSMA/ECA and adaptive sensitivity control to enable simultaneous transmit and receive in IEEE 802.11 WLANs, improving bi-directional and uni-directional full-duplex communication with minimal protocol changes.

Contribution

It introduces a new approach leveraging CSMA/ECA and adaptive sensitivity control for STR mode in WLANs, ensuring compatibility with legacy nodes and optimizing full-duplex link opportunities.

Findings

Effective in enabling STR operation with minimal protocol modifications

Achieves significant gains in bi-directional and uni-directional FD links

Ensures coexistence with legacy WLAN nodes

Abstract

Ever since the feasibility of in-band full-duplex (FD) at the Physical (PHY) layer has been established, several studies have emerged investigating protocol aspects of enabling FD operation in various legacy wireless technologies. Recently, the adoption of a simultaneous transmit and receive (STR) mode for next generation wireless local area networks (WLANs) has received significant attention. Enabling STR mode (FD communication mode) in 802.11 WLANs creates bi-directional FD (BFD) and uni-directional FD (UFD) links. STR mode in 802.11 WLANs must be enabled with minimal protocol modifications while accounting for the co-existence and compatibility with legacy nodes and protocols. This paper provides a novel solution, that can leverage carrier sense multiple access with enhanced collision avoidance (CSMA/ECA) and adaptive sensitivity control mechanisms, for enabling STR operation. The key aspects of the proposed solution include co-existence with legacy nodes, identification of eligible nodes for UFD, optimization of secondary BFD and UFD transmissions, and creation of UFD opportunities. Performance evaluation demonstrates that the proposed solution is effective in achieving the gains provided by STR operation.