CT WG4 - Core Network Protocols

Election Results

April 7, 2025: Yue Song representing China Mobile Com. Corporation (CCSA) was Re-elected Chair for TSG CT WG4 for the next two years.

Two CT WG4 Vice Chairs were also elected: Zhijun LI representing ZTE Corporation (CCSA) was re-elected (second term) and Anders ASKERUP representing Cisco Systems (ATIS) was elected for his first term.

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Within the 3GPP Technical Specification Group Core Network and Terminals, the main objectives of the 3GPP TSG CT WG4 (CT4) are to specify the protocols within the Core Network and prepare the specifications describing the protocol requirements in the area of:

Numbering, Addressing and Identification
Access and mobility management
Session management
Subscription data management
Subscriber authentication
SMS services
Location services
Data management and Repository
Network slice selection services
NF registration and discovery services
DNS procedures within 3GPP
Separation between Control Plane and the User Plane function
Restoration
Interconnection between PLMNs

CT4 is currently tasked to design and specify the protocols for the HTTP-based APIs used to access services offered by the network functions to other network functions in the areas listed above within the service-based architecture defined for the 5G core network.

Terms of Reference

The latest terms of reference were approved at at CT#90-e in document CP-203097