Re: 802.16e vs 802.20?
User Ranking
Friday February 13, 2004 6:57:00 AM
Interesting post.
When 802.20 was proposed, .16 was fixed only, and 3G was, well, it wasn't .
But now, the situation looks different. The .20 timeline has slipped, with dates of 4Q05 now being discussed.
But .16e offers a very similar spec - with a lot more to offer in terms of backing, interoperability and existence.
From the other side, EVDO is demonstrating success, more & more operators are launching WCDMA (interestingly, for example, VODA have launched it as an EVDO style service). HSDPA is imminent - with DoCoMo committed to a service launch next year.
There is a lot of standards politics in all this.
Just as in UWB, these are proxies for corporate fights. So INTEL have their weight behind WiMax, Moto are pushing .20.
I do love standards bodies: a bizarre mix of high technology with low political cunning & deals in smoke filled rooms :)
In terms of technology & spectrum efficiency, there really isn't much in it.
Latency, packet ARQ algorithms & the like are important, but they are complex and subtle; that makes them hard to get excited about, and hard to really say how things will work till after you've deployed & optimised. As standardsarefun points out - many of these are parameters, and a lot ore independent of the standard per se.
"Show me the money" -- I think Motorola & Nextel are indeed precursors of the future for Flarion and .20. It may well be the next iDEN - a nice little earner, but not really that interesting on the world stage.
btw Justin where does this "three times the efficiency of 3G" come from? Flarion claim 1.5Mbps-3Mbps in 1.25MHz. That isn't too different to EVDO offering 2Mbps - and that is in widespread commercial service now. It is less than HSDPA with 14Mbps in 5MHz.
There's a good reason for this, called Shannon's limit. None of them (none of them) will deliver those data rates in the majority of cases.
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