Hello everybody, I have just subscribe to itu-sg16. I'm mostly interested in H.323 link with radio access, being involved in 3GPP standardization (3GPP S2 working group responsible of network architecture)

Please find attached some comments on Contribution "Integrating 3GPP's option-1 architecture into the H.323 wireless IP mobility system and a full migration from GPRS to a Multimedia IP network proposal" (file MTD-05) - source Motorola - to be discussed on wednesday about H323 mobility.

- comment on section "Alternate Proposal for an all IP option for 3GPP R'00. The purpose the all IP proposal is also to allow support of release 99 CS domain terminals. In addition it will also support the IP based services of option 1."

The figure shown in the contribution does **NOT** correspond to the support of the CS terminals as described in 3GPP 23.922. This option 2 of the 3GPP standard corresponds to the option 1 architecture plus -- a MSC server mainly that comprises the call control and mobility control parts of a GSM/UMTS R99 MSC. MSC server controls the parts of the call state that pertain to connection control for media channels in a MGW. -- A GMSC server that mainly comprises the call control and mobility control parts of a GSM/UMTS R99 GMSC. The attached MTD05comment.zip contains extracts from 3GPP23.922 that explain the 3GPP position on network architecture.

The following further discrepancies between contribution MTD05 and 3GPP specifications are: -- The network architecture defined by 3GPP does *NOT* imply to have the GK and the SGSN function mixed, -- nor has 3GPP accepted to merge the GGSN and the MG functions -- nor has 3GPP accepted to have a Gi interface between UTRAN (radio) and GGSN (Gateway to Packet Data networks such as Intranets / ISPs). Merging of functions is always possible at the implementation level but should not be dictated by standardization when not necessary.

As H.323 networks may have to interact with other non 3GPP radio (and even mobile, non terrestrial radio) networks, it is better to have, as 3GPP has done, a clear separation between (radio) access bearer layer - UTRAN, ERAN, SGSN, GGSN for 3GPP networks, PDSN for CDMA2000 networks - and multimedia call control layer e.g. GK.

Best regards Laurent T. --------------------------------------------------------------------------- V Laurent Thiebaut tel: +33 (0)1 3077 0645 A L C A T E L e.mail:laurent.thiebaut@alcatel.fr --------------------------------------------------------------------------- (Alcatel representant to 3GPP SA Working group 2 that is responsible of 3GPP system architecture)