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| WiMAX, LTE and Femtocells Some Insights from AIRCOM International |
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From rharaseth@... Thu Jul 09 15:22:30 2009
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From: "Ron Haraseth" <rharaseth@...>
Subject: WiMAX, LTE and Femtocells Some Insights from AIRCOM International
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WiMAX, LTE and Femtocells Some Insights from AIRCOM International
TMC Net - Norwalk,CT,USA
..."Although people didn't originally think of LTE for voice, you actually =
have two solid propositions for voice call network," says Goetz. "First, th=
ere's the IMS [IP Multimedia Subsystem] approach or the Unlimited Mobile Ac=
cess [UMA]-derived approach called VoLGA [Voice over LTE via Generic Access=
] which enables mobile operators to deliver mobile voice and messaging serv=
ices over LTE access networks based on the existing 3GPP Generic Access Net=
work [GAN] standard. Again, you're getting a system that's designed from th=
e handset to the point of interconnect with other networks to provide voice=
calls. But what you get with WiMAX is a ASN and a CSN, as I said previousl=
y. On top of that the operator must provide its own voice solution. I worke=
d a vendor up until about two years ago involving a major WiMAX deployment =
in Pakistan. They needed a core network for VoIP. At the time we provided t=
he world's largest IMS deployment for commercial VoIP. But if you were then=
to take those WiMAX devices and attempt to use them in another network, th=
at core network isn't there, and so the roaming capability would not be the=
re either, which means that you wouldn't have a seamless, wireless voice so=
lution for customers. So 3GPP and VoLGA on one side offers a specified solu=
tions end-to-end, while WiMAX is effectively an access network, and you hav=
e to worry about the call running on top."
Goetz adds, "What you have to take into account with LTE is the migration f=
rom the existing 3GPP network where you have effectively a C7-based core sw=
itching network even with the split architecture Mobile Switching Center [M=
SC] servers and media gateway, and you've got evolve that into either an IM=
S or VoLGA environment. Hopefully operators will standardize on one of thos=
e, and predominantly a Session Initiation Protocol (News - Alert) [SIP]-bas=
ed technology, and still have legacy interconnect to other networks still u=
tilizing the older technologies. LTE has a good foundation; there are still=
a few issues to solve, but it's better placed from an end-to-end standard =
with which to deal with these issues." ...
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<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: 15px"=
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<DIV><FONT size=3D2 face=3DArial>
<DIV><A style=3D"COLOR: blue"=20
title=3D"http://4g-wirelessevolution.tmcnet.com/wimax/topics/wimax/articles=
/59600-wimax-lte-femtocells-some-insights-from-aircom-international.htm
=
;CTRL + Click to follow link"=20
href=3D"http://4g-wirelessevolution.tmcnet.com/wimax/topics/wimax/articles/=
59600-wimax-lte-femtocells-some-insights-from-aircom-international.htm"><ST=
RONG=20
title=3D"http://4g-wirelessevolution.tmcnet.com/wimax/topics/wimax/articles=
/59600-wimax-lte-femtocells-some-insights-from-aircom-international.htm
=
;CTRL + Click to follow link">WiMAX,=20
LTE and Femtocells Some Insights from AIRCOM International</STRONG></A><BR>=
<FONT=20
size=3D-1><FONT color=3D#666666>TMC Net - Norwalk,CT,USA</FONT></FONT></DIV=
>
<DIV>...=93Although people didn=92t originally think of LTE for voice, you =
actually=20
have two solid propositions for voice call network,=94 says Goetz. =93First=
, there=92s=20
the IMS [IP Multimedia Subsystem] approach or the Unlimited Mobile Access=20
[UMA]-derived approach called VoLGA [Voice over LTE via Generic Access] whi=
ch=20
enables mobile operators to deliver mobile voice and messaging services ove=
r LTE=20
access networks based on the existing 3GPP Generic Access Network [GAN]=20
standard. Again, you=92re getting a system that=92s designed from the hands=
et to the=20
point of interconnect with other networks to provide voice calls. But what =
you=20
get with WiMAX is a ASN and a CSN, as I said previously. On top of that the=
=20
operator must provide its own voice solution. I worked a vendor up until ab=
out=20
two years ago involving a major WiMAX deployment in Pakistan. They needed a=
core=20
network for VoIP. At the time we provided the world=92s largest IMS deploym=
ent for=20
commercial VoIP. But if you were then to take those WiMAX devices and attem=
pt to=20
use them in another network, that core network isn=92t there, and so the ro=
aming=20
capability would not be there either, which means that you wouldn=92t have =
a=20
seamless, wireless voice solution for customers. So 3GPP and VoLGA on one s=
ide=20
offers a specified solutions end-to-end, while WiMAX is effectively an acce=
ss=20
network, and you have to worry about the call running on top.=94</DIV>
<DIV> </DIV>
<DIV>Goetz adds, =93What you have to take into account with LTE is the migr=
ation=20
from the existing 3GPP network where you have effectively a C7-based core=20
switching network even with the split architecture Mobile Switching Center =
[MSC]=20
servers and media gateway, and you=92ve got evolve that into either an IMS =
or=20
VoLGA environment. Hopefully operators will standardize on one of those, an=
d=20
predominantly a <!--ZZZLinkBegZZZ-->Session Initiation Protocol (<A=20
href=3D"http://www.tmcnet.com/snapshots/snapshots.aspx?Company=3DSession+In=
itiation+Protocol"><FONT=20
color=3D#356894>News</FONT></A> - <A=20
href=3D"http://www.tmcnet.com/enews/subs.aspx?k1=3D%22Session+Initiation+Pr=
otocol%22&k2=3D+%22SIP%22"><FONT=20
color=3D#356894>Alert</FONT></A>)<!--ZZZLinkEndZZZ--> [SIP]-based technolog=
y, and=20
still have legacy interconnect to other networks still utilizing the older=
=20
technologies. LTE has a good foundation; there are still a few issues to so=
lve,=20
but it=92s better placed from an end-to-end standard with which to deal wit=
h these=20
issues.=94 ...</DIV></FONT></DIV></BODY></HTML>
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"Ron Haraseth" <rharaseth@...>
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