The T6 interface is a 6G connectivity control interface that enables signaling exchange between the serving node (sNode) and the connectivity function control plane (CF-C) to manage user plane connections and network resources.
Definition
In a 6G network, the serving node (sNode) interacts with multiple network functions through standardized interfaces. The sNode is connected to the Network Access Function (NAF) through a T5 interface, to the connectivity function control plane (CF-C) through the T6 interface, and to the connectivity function user plane (CF-U) through a T7 interface.
The T6 interface specifically supports connectivity-based control signaling between the sNode and the CF-C. It is responsible for managing user plane connections, coordinating resource allocation, and ensuring proper connectivity across the access and core network.
By using the T6 interface, 6G networks can dynamically configure user sessions, manage mobility events, and optimize resource scheduling for efficient and reliable data delivery. It plays a key role in bridging the access network with the control plane of the 6G core network (6GC).
Examples
The sNode exchanges user access management (UAM) signaling with the NAF through the T5 interface. For connectivity control signaling, it communicates with the CF-C via the T6 interface. Data bearers are established with the CF-U through the T7 interface, which handles user data transmission.
For instance, when a terminal device connects to the network, the sNode uses the T6 interface to request connectivity resources from the CF-C. The CF-C coordinates the allocation of user plane resources in the CF-U and informs the sNode about session parameters through T6 signaling.
This interface is also used during session updates, handovers, or mobility events. The sNode communicates connectivity changes and control commands to the CF-C via the T6 interface, ensuring seamless user experience with minimal latency.
Together with T5 and T7, the T6 interface forms a structured signaling and data management framework that supports reliable, scalable, and intelligent network operation in 6G. It enables dynamic session management and real-time control of user plane connections across access and core networks.
References
6G Network Interface Architecture and Connectivity Control Concepts
(T5, T6, T7 Interface Integration for sNode Signaling and User Plane Management)