Dear All, Very good questions: I passing this email on because MR. Binar questions highlights some key issues. Ed FAQ's on IP wireless mobility. -------- Original Message -------- Subject: Re: H.323 mobility first darft Date: Wed, 01 Sep 1999 17:15:17 -0400 From: "Edgar Martinez [1]" <martinze@cig.mot.com> Organization: NSS-NAT To: "BINAR, Simon" <binar@isd-nec.co.uk> References: <199909011655.LAA02929@alba.cig.mot.com> Hi Simon, Thank you for your comments, Please read on... "BINAR, Simon" wrote:

Hi Ed,

I looked at the document, and I would have a couple of questions/comments about it.

It seems to me that the draft provides the description of a complete wireless access system.

Yes, based on the SG16 Terms of reference.

However, I don't understand the point of providing such a description, since wireless access systems suitable for multimedia communications are being specified elsewhere (3GPP).

Based on the Terms of reference and the Ad-hoc meetings we had in SG16. The assumptions where: 1. We will have H.323 wireless mobile handsets 2. We will provide IP mobility regardless of terminal type Fixed or Wireless 3. We will interwork with the legacy wireless (Networks and Terminals) which includes handovers.. 3GPP or 3GPP-2000 is based on GPRS and something called the layered approach to the IP network. Which ready means two separate networks one for IP and the other for mobility connected via a GW. The RAN interface (Iu-ps) to the GPRS network element is a lower layer ATM/AAL2 with IP on the upper layer connected to E-SGSN switch. I can not be convinced or believe that this is the pure IP solution for wireless.

Shouldn't the wireless access system rather be completely transparent to H.323 signalling?

It is completely transparent, take alway the WAU and the HZR and you have your basic H.323 VoIP network.

Additionally, it seems to me that the proposed architecture does not take into account mobility between fixed terminals. I can imagine situations whereby a user could take his SIM card from one fixed H.323 terminal to another. In such a case, mobility support at the H.323 application layer would be required, however, no wireless access system would be involved, and thus, components such as the WAU would not be required either...

Yes, you are right on the money, look at 8.2.1.5 "H.323 fixed terminal registration in a visited IP network" which implies exactly what you stated. The way it works from my research, is that the IMIS is programed in to the SIM card. The user ID is the IMIS once the user, that is, the IMIS is registered in the HZR. The user can plug the SIM card with the proper IMIS in a wireless terminal or fixed terminal. Please note that in the two fixed case call flows both 8.2.1.5 and 8.2.1.6 no WAU are used or shown. Only for the wireless cases.

---------------------------------------------- Simon Binar NEC Europe Ltd. Tel: +44 (0)1753 606933 Fax: +44 (0)1753 606901 EMail: binar@isd-nec.co.uk ----------------------------------------------- DISCLAIMER: Any views or opinions expressed in this E-Mail message should be considered as the personal views/opinions of the author. They do not necessarily represent the views of the author's employer.

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-----Original Message----- From: Edgar Martinez [1] [mailto:martinze@CIG.MOT.COM] Sent: 23 August 1999 08:19 To: TIPHON@LIST.ETSI.FR Subject: H.323 mobility first darft

Dear All

I have uploaded the first H.323 draft, for user and service mobility. The focus of the document at the moment is to provide full mobility regards of terminal types, that is either fixed or wireless h.323 terminals. Only using H.323 messages with additional extensions to provide seamless wireless handover and terminal roaming.

Anyone can pick-up a copy in following wed sites.

http://people.itu.int/~emartine/temp/ or ftp://standard.pictel.com/avc-site/Incoming/

The Filename is h323mob01.zip

Comments are welcome.

Best Regards, -- Edgar Martinez - Principal Staff Engineer Email mailto:martinze@cig.mot.com FAX 1-847-632-3145 - - Voice 1-847-632-5278 1501 West Shure Drive, Arlington Hgts. IL 60004 Public: TIPHON & Other Stds - http://people.itu.int/~emartine/ Private:TIPHON & Other Stds - http://www.cig.mot.com/~martinze/

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-- Edgar Martinez - Principal Staff Engineer Email mailto:martinze@cig.mot.com FAX 1-847-632-3145 - - Voice 1-847-632-5278 1501 West Shure Drive, Arlington Hgts. IL 60004 Public: TIPHON & Other Stds - http://people.itu.int/~emartine/ Private:TIPHON & Other Stds - http://www.cig.mot.com/~martinze/