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Understanding Backward Compatibility Feature for 802.11aj: A Detailed Analysis

This document delves into the backward compatibility feature for IEEE 802.11aj in the 60GHz band, clarifying its relation with IEEE 802.11ad and proposing compatibility modes. Definitions, scenarios, and principles are elaborated to foster consensus within the 802.11aj Task Group.

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Understanding Backward Compatibility Feature for 802.11aj: A Detailed Analysis

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  1. Backward Compatibility Feature for 802.11aj Date: 2013-04-24 Presenter: Xiaoming Peng

  2. Author List Xiaoming Peng

  3. Abstract • This document is to describe the understanding of the backward compatibility feature for 802.11aj for the 60GHz frequency band • To respond to 11-13/0292r0 – Backward compatibility of 11aj with 11ad • This contribution has been discussed in CWPAN group Xiaoming Peng

  4. Background • IEEE 802.11aj PAR specified backward compatibility to IEEE 802.11ad. • Definition of backward compatibility is crucial to 802.11aj in deciding the level of support required. • There is no consensus yet on the meaning of backward compatibility. • In this presentation, we present a definition based on broad principles of fairness and efficiency. • Seek to achieve a broad consensus within 802.11aj Task Group if possible or identified the points of contention for future resolution. Xiaoming Peng

  5. Backward Compatibility Feature 802.11aj MAC (amendment to 802.11-2012 + amendment to 802.11ad) 802.11aj STA 802.11aj PHY in 45GHz 802.11ad PHY 60GHz 802.11aj PCP 802.11ad STA 802.11aj PHY in 60GHz Scenario: 802.11aj (60GHz) 802.11aj Architecture • Only when 802.11aj device operates over Chinese 60GHz channel, it is required to keep the backward compatibility to 802.11ad Xiaoming Peng

  6. Comments on 11-13/0292r0 • 11-13/0292r0 highlighted the following • 11n does not have modes: 11n has PHY formats (legacy, HT-MM, HT-GF) with associated usage rules to ensure backwards compatibility • Greenfield “mode” does NOT imply that there is no backward compatibility • Greenfield allows data transmissions in a BSS to be restricted to a given mode (e.g., HT), but backward compatibility still exists • Use of HT-GF format is subject to an array of restrictions to minimize backwards compatibility issues. E.g., review the HT Protection, Nongreenfield HT STAs Present and OBSS Non-HT STAs Present fields in the HT Operation element, and associated normative text • It is agreeable to remove the “Exclusive Mode” described in 11-13-1750r0 in the following slide Xiaoming Peng

  7. Compatibility Modes(IEEE 802.11 Precedent) • IEEE 802.11n supports three compatibility modes to a/b/g • Legacy Mode • Mixed Mode • Greenfield Mode • We propose 11aj to support two correspondingly compatibility modes to 11ad • Legacy Model (Large Band Only Mode) • 802.11aj operate as 802.11ad device (Outside China). • Mixed Mode • 802.11aj can support both the 802.11ad STAs and 802.11aj STAs. Xiaoming Peng

  8. Legacy Mode • 802.11aj devices will operate according to 802.11ad channels and protocols. • No new protocols required. • Used primarily when 802.11aj devices are operating outside of China. Xiaoming Peng

  9. Mixed Mode • 802.11aj BSS can support the operation of both the 11ad devices and 11aj devices. • 802.11ad STAs able to join the network and perform data exchange with AP/PCP and other STAs in 802.11aj BSS • 802.11aj STAs able to join the network and perform data exchange with other 802.11aj STAs; • Formation of new network • 802.11ad AP/PCPs can start a new network if channel is available. Xiaoming Peng

  10. Principles in Determining Channel Access • Principle: Equal priority between IEEE 802.11ad and IEEE 802.11aj STA. • Application of the principles to the different operating scenarios • Formation of new network • New STAs joining existing network Xiaoming Peng

  11. Thank YOU Xiaoming Peng

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