Working Group CT1 is responsible for the 3GPP specifications that define the User Equipment - Core network L3 radio protocols and Core network side of the Iu reference point. Specifically it has a responsibility for:

• User Equipment - Core network layer 3 radio protocols (Call Control, Session Management, Mobility Management, SMS);
• Management of work items placed under its responsibility.

A technical vote will be held during CT WG1#77.**

Useful links and information

Terms of reference

See the [terms of reference are in the terms of reference, updated at TSG#28 (doc CP-050056).

CT1 will address the following areas of work:

• Connection Management and Mobility Management related matters, both Circuit Switched and Packet protocols;
• Short Message Service stage 2
• Mobility Management, Call Control, Session Management, Short Message Service, and Location services L3 signalling between the user equipment and the core network;
• AT command set for the UE
• SIP Call Control protocol for the IM subsystem.
• SDP protocol for the IM subsystem.
• Integration of wireless access protocols to the 3GPP CN;
• Signalling for interworking with other networks (e.g. handover and roaming) together with CT3 and CT4;
• Core network signalling between the Core network nodes placed under its responsibility together with CT4;
• Core network aspects of the Iu interface; The scope of CT1 is the following:
• Maintenance of protocols: Mobility Management, Call Control, Session Management, SMS, Group and Broadcast call.
• Applicability and enhancements of SIP to mobile environment.\
• Applicability and enhancements of SDP to mobile environment.
• Interaction of SIP related procedure with GPRS procedures.
• Applicability and integration of WLAN in 3GPP mobile environment at the radio interface.
• Development and maintenance of MM part of the MS idle mode functionality
• Development and maintenance of the CN side of the Iu reference point.
• Maintenance of the SGSN-VLR (Gs) interface
• Maintenance of Mobile Radio L3 requirements (3GPP TS 24.007)
• Maintenance of Mobile Radio L3 stage 3 (3GPP TS 24.008)

See the full terms of reference, updated at TSG#28 (doc CP-050056).