1 / 7

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.

rnunez
Télécharger la présentation

An Independent Proposal for a TGg Resolution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related