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An Independent Proposal for a TGg Resolution

This proposal discusses the viability of CCK-OFDM in the WLAN industry and suggests a compromise approach, "CCK + OFDM", as a solution. It explores the benefits, downsides, and potential next steps for TGg.

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An Independent Proposal for a TGg Resolution

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  1. An Independent Proposal for a TGg ResolutionCarlos RiosRiosTek Carlos Rios, RiosTek

  2. TGg at the moment • CCK-OFDM has survived, but can it win? • Should CCK-OFDM win? • CCK-OFDM is itself a compromise, begat from • Mandatory >20 Mbps data rate, per the PAR • Mandatory backwards compatibility with 802.11b • Industry-wide trend towards OFDM technology • Obsolete regulatory requirements:The FCC changed the rules in mid-stream! • Following is a compromise proposal that: • Might be the best for the WLAN Industry • Might not be the best for the TGg proposers Carlos Rios, RiosTek

  3. Let’s think about this • TGg started working with 4 new 20 Mbps+ waveforms created with the previous regulatory environment in mind • There is no longer a compelling need for any of them • Don’t need CCK-OFDM, PBCC-22, MBCK or DQPSK-22 • Could just use “2.4 GHz 802.11a OFDM” and add backwards compatibility with 802.11b • Specifically, a brain dead “2.4 GHz CCK + OFDM” approach:“Bilingual” or “Dual Mode” CCK and OFDM APs and NICs • There appears to be a desire in the industry for “convergence” of WLAN standards and equipment • HiperLAN2 and 802.11a melding efforts • Desire for “combo 802.11a and b” devices • Maybe a cell-phone like multimode, multiband WLAN? • Combo 802.11a, b, g and HL2 devices, 2.4 and 5 Ghz • Not as silly as you might think- Direct RF conversion and Moore’s Law • Propose that TGg be the first step in this “Grand Convergence” Carlos Rios, RiosTek

  4. The Benefits • Eliminates the need for CCK-OFDM • This “tortured compromise” can quietly go away • Combines high overhead of CCK with the reduced sensitivity of OFDM • Results in the low throughput of 802.11b AND reduced range of 802.11a • “CCK + OFDM” is simpler and higher performance • Dual Mode CCK and OFDM device at 2.4 GHz • No New Waveforms, use either CCK or OFDM at any instant • Meets the PAR requirements • Meets new, relaxed FCC requirements • Possible TGg AP configuration: • “Extended PCF” issues both CCK and OFDM beacons • TGg STAs respond to OFDM beacons • Legacy 802.11b STAs respond to CCK beacons • Possible TGg STA configuration • Biased toward OFDM operation with TGg APs • Talks CCK to legacy 802.11b APs Carlos Rios, RiosTek

  5. The Downside • CCK-OFDM, PBCC may sorely missed by some • After all, they were the last standing survivors • Much good thought and hard work went into them • Not the best “compromise” for the presenters • None of them really get what they wanted Carlos Rios, RiosTek

  6. What to do in TGg? • CCK-OFDM will go to a vote this week • If CCK-OFDM gets more than 75%, this presentation will be moot • If CCK-OFDM gets less than 30% this presentation will lack compelling relevance • Assuming CCK-OFDM vote falls somewhere in between, what then? Suggest that CCK+OFDM be adopted as the compromise proposal for the next round of TGg voting Carlos Rios, RiosTek

  7. Summary • TGg has not yet reached consensus • The last standing survivor, CCK-OFDM, may not be the best solution under the new regulatory circumstances • “CCK + OFDM” is a good alternative • Could be the first step in a good direction for the industry • Like all compromises, nobody gets everythingthey wanted • Existing silicon could be cobbled together to produce CCK+OFDM devices in the near term • The TGg committee can expedite and complete its work Carlos Rios, RiosTek

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