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Coordinated Beamforming for 802.11bn: A Proposal by Nokia

This proposal by Nokia discusses the concept of Coordinated Beamforming (Co-BF) in IEEE 802.11bn networks, aiming to enhance spatial reuse opportunities and reduce latency by leveraging beamforming and null steering capabilities. The document outlines the objectives, meaning, framework, and opportunities of Co-BF, emphasizing its potential benefits for Wi-Fi access points in densely deployed environments.

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Coordinated Beamforming for 802.11bn: A Proposal by Nokia

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  1. January 2024 doc.: IEEE 802.11-24/0009r0 Coordinated Beamforming for 802.11bn Date: 2024-01-03 Authors: Name Okan Mutgan Affiliations Nokia Address Phone email okan.mutgan@nokia- sbell.com Prabodh Varshney Lorenzo Galati Giordano Mika Kasslin Francesc Wilhelmi Gianluca Fontanesi Submission Slide 1 Okan Mutgan et al., Nokia

  2. January 2024 doc.: IEEE 802.11-24/0009r0 Background • Multi-AP coordination (MAPC) is one of the most discussed protocol enhancements for 802.11bn. • MAPC may enable development of new features, among them Coordinated Beamforming (Co-BF). • Co-BF has been already extensively discussed in TGbe [1-5] and leverages on the applications of beamforming and null steering capabilities. Submission Slide 2 Okan Mutgan et al., Nokia

  3. January 2024 doc.: IEEE 802.11-24/0009r0 Objectives • Clarify Co-BF meaning, its requirements and opportunities. Submission Slide 3 Okan Mutgan et al., Nokia

  4. January 2024 doc.: IEEE 802.11-24/0009r0 What does Co-BF mean? • Wi-Fi access points (APs) are densely deployed and equipped with multiple antennas. • Digital precoding/filtering techniques allow APs to focus radiation patterns towards users to serve, BUT also to null interference towards/from overlapping basic service set (OBSS) devices. • The application of radiation nulls requires CSI acquisition from OBSS devices. • APs equipped with Co-BF with null steering have the possibility to share channel and time resources, avoiding contentions and interference. Submission Slide 4 Okan Mutgan et al., Nokia

  5. January 2024 doc.: IEEE 802.11-24/0009r0 Co-BF framework for 802.11bn 1. Define a common MAPC framework (wireless or wired) valid for Co-BF but also for other coordination techniques:  Coordination set establishment and maintenance with the means available in the semi-static MAPC framework 2. Define a specific Co-BF framework for:  CSI acquisition from OBSS devices (CSI acquisition means for own devices reused).  Allocation and communication of nulling capabilities in both UL and DL directions. 3. Data transmission with beams and nulls activated  Relaxing channel access constraints (concurrent transmission without power reduction) Submission Slide 5 Okan Mutgan et al., Nokia

  6. January 2024 doc.: IEEE 802.11-24/0009r0 Co-BF opportunities • Through Co-BF with null steering is possible to boost spatial reuse opportunities by making media available for simultaneous transmissions, thus reducing worst-case latency [2, 5]. • We aim to highlight the opportunity to build upon what has been already discussed [1-5] and straw-polled (see below) in TGbe. Submission Slide 6 Okan Mutgan et al., Nokia

  7. January 2024 doc.: IEEE 802.11-24/0009r0 Straw poll • Do you believe coordinated beamforming with null steering should be considered for inclusion in the 802.11 TGbn Specification Framework Document (SFD)? • Yes • No • Abstain Submission Slide 7 Okan Mutgan et al., Nokia

  8. January 2024 doc.: IEEE 802.11-24/0009r0 References [1] “Coordinated Null Steering for EHT”, 19/0811. [2] “Performance of Coordinated Null Steering in 802.11be”, 19/1212. [3] “Coordinated Beamforming/Null Steering in 802.11be”, 19/1594. [4] “Downlink spatial reuse parameter framework with coordinated Beamforming/Null Steering for 802.11be”, 19/1779. [5] “Performance of parameterized spatial reuse (PSR) with coordinated beamforming/null steering for 802.11be”, 20/0091. Submission Slide 8 Okan Mutgan et al., Nokia

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