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A Novel Full-Duplex Protocol For Faster WLANs

Technology Overview

The challenge of improving the performance of wireless networks has always been intriguing. However, only half of the physical bandwidth is available for one way wireless communication, since the channel needs to be partitioned for transmitting and receive operations either in the frequency or time domain. 

This is because a wireless node cannot transmit and receive over the same frequency band at the same time; in other words, full-duplex (FD) communication is not possible. The reason full-duplex (FD) communication has not yet been possible in wireless systems is the significant amount of self-interference.

This technology is developed for improving the performance of wireless networks. It is a method and system (synchronized contention window (S-CW) full-duplex (FD) protocol) to enable FD communication in wireless local area networks (WLANs) for improving the performance of WLANs by using S-CW FD protocol as a MAC scheme.

Technology Features & Specifications

The S-CW FD protocol according to this invention can be applied to different FD scenarios (bidirectional or relaying) via the same access mechanism, and it can work together with IEEE 802.11 legacy nodes. 

S-CW FD protocol is therefore presented as a generic, easy to implement MAC protocol, which enables FD in WLANs while supporting legacy HD IEEE 802.11 nodes, which is named as one of the challenges that FD MAC protocols face in the future. 

This technology proposes Synchronized Contention Window Full Duplex (S-CW FD) protocol as a modified form of IEEE 802.11 MAC with mechanisms to support the FD operation, so as to synchronize the involved nodes with minimal overhead. 

It also improves the network throughput by S-CW FD, by FD transmissions and by alleviation of the hidden terminal problem. 

The main advantage of S-CW FD is its simplicity, due to easy implementation on off-the-shelf 802.11 equipment, which can work in infrastructure and ad-hoc mode, while supporting bidirectional and relaying FD transmissions and additionally it can work with legacy 802.11 nodes.

The S-CW FD of this technology provides 1.5-2 times higher throughput in comparison to HD legacy WLANs, in the case there are no hidden nodes in the network.

RTS/CTS is no longer necessary for FD since by nature FD solves the hidden terminal problem.

S-CW FD works in bi-directional scenarios where two nodes communicate simultaneously with each other. 

Potential Applications

The S-CW FD protocol according to this invention can be applied to different FD scenarios (bidirectional or relaying) via the same access mechanism, and it can work together with IEEE 802.11 legacy nodes. Hence, S-CW FD is not only flexible but also it can be easily implemented by making use of the off-the-shelf WLAN hardware and firmware. It can be used in these fields:

  • WLAN devices
  • Wireless chipsets
  • WLAN adapters

Customer Benefits

  • Enabling FD in WLANs for enhanced throughput. 
  • Providing 1.5-2 times higher throughput in comparison to HD legacy WLANs,
  • Improving the performance of WLANs
  • Easy implementation

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