-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Matt Liotta
Sent: Wednesday, September 09, 2009 3:34 PM
To: WISPA General List
Subject: Re: [WISPA] Which WiMAX Are You?
I look forward to seeing everyone at 4G World next week.
Personally, I don't care for D or E in a fixed deployment, but if you
nailed
me down I would go with D. WiMAX tries to be too many things for too
many
people. WiMAX-based proprietary systems are far more useful for fixed
deployments.
-Matt
On Wed, Sep 9, 2009 at 5:28 PM, Patrick Leary <[email protected]>
wrote:
The subject question is one Aperto thinks should be asked and now is
the
time to ask it. The WiMAX Forum has been beating the 802.16e drum in
a
manner trying to chump 802.16d. The fact is, there are two WiMAX
standards, not one. By the Forum's own words from a 2005 paper it put
out in November 2005, penned by Monica Paoli of Seza Fila:
"The WiMAX Forum is committed to providing optimized solutions for
fixed, nomadic,
portable and mobile broadband wireless access. Two versions of WiMAX
address the
demand for these different types of access:
* 802.16-2004 WiMAX. This is based on the 802.16-2004 version of the
IEEE 802.16
standard and on ETSI HiperMAN. It uses Orthogonal Frequency Division
Multiplexing (OFDM) and supports fixed and nomadic access in Line of
Sight
(LOS) and Non Line of Sight (NLOS) environments.
* 802.16e WiMAX. Optimized for dynamic mobile radio channels, this
version is
based on the 802.16e amendment and provides support for handoffs and
roaming."
It is time the Forum own up to their own words, so Aperto is going to
asking the question at 4G World coming up in Chicago next week. The
fact
is, the fixed standard is stable and ideal for what it was designed
to
do: deliver fixed (and limited nomadicity) wireless broadband. This
version of the standard is better, yes better, than the mobile
version
for doing metroscale fixed. It provides 13% more capacity per MHz and
35% or so less latency. It can also be configured for symmetric or
even
higher ratio upstream vs. downstream, which is critical for networks
doing high capacity upstream like video surveillance.
For too long, vendors that now only do the mobile standard have been
trying to squeeze the round peg of the mobile standard into the
square
hole of fixed networks. This has been confusing many, and leading
some
to overpay for their networks. Why pay for millions in R&D for
features
that you can never use, especially in a 3.65 GHz network where mobile
can't happen? We have seen "consultants" spec'ing in E for 3.65 GHz,
thinking they will get interoperability and even PC cards for their
networks. They also think they can get self-install -- something this
community knows is not possible in 3.65 GHz due to the power
restrictions placed on indoor modems. Operators and other would-be
WiMAX
deployers are being hoodwinked.
The E standard does enable use of diversity, but it comes at a high
cost
and is of limited benefit for rural operators. The truth is that
diversity is designed to increase link budgets to support self-
install.
Basically, each standard has its place, E is for people in 2.5 GHz
doing
self-install, like Clearwire, and we all know the low service
(especially low upstream) packages offered in Clearwire's service. D
is
better and cheaper for rural fixed operators, and especially for
public
safety video type networks and definitely for voice-centric users. D
is
better for enterprise, where many users sit behind the CPE. E is
better
for roaming individual users with modest expectations.
We'd like to hear your opinions, and if you like to discuss this with
us
while at 4G World, please drop me a note.
Regards,
Patrick Leary
Aperto Networks
Patrick Leary
Aperto Networks
813.426.4230 mobile
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