1. An Independent Proposal for a TGg Resolution Carlos Rios RiosTek
November 2001
An Independent Proposal for a TGg Resolution Carlos Rios RiosTek
Carlos Rios, RiosTek

2. TGg at the moment CCK-OFDM has survived, but can it win?
November 2001
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 b
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. November 2001
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 a OFDM” and add backwards compatibility with b
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 a melding efforts
Desire for “combo a and b” devices
Maybe a cell-phone like multimode, multiband WLAN?
Combo a, 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
November 2001
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 b AND reduced range of a
“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 b STAs respond to CCK beacons
Possible TGg STA configuration
Biased toward OFDM operation with TGg APs
Talks CCK to legacy b APs
Carlos Rios, RiosTek

5. The Downside CCK-OFDM, PBCC may sorely missed by some
November 2001
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
November 2001
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
November 2001
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 everything they 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