6G • Core Network
BSF-6G
Binding Support Function with Anycast Routing
A routing coordinator ensuring that all control and user plane signaling for a specific PDU session always binds to the identical serving PCF and SMF instances.
Technical Explanation
In large distributed 6G cores with thousands of parallel PCF and SMF instances, control messages belonging to the same user session must reach the specific instances holding that session's state. BSF-6G maintains dynamic IP-to-instance binding tables. Operating with BGP Anycast routing, BSF-6G directs policy updates and session modifications to the correct functional instance in sub-milliseconds without central proxy bottlenecks.
Key Functions
- Dynamic binding of UE IP/IPv6 prefixes to specific serving PCF and SMF instances
- BGP Anycast routing integration distributing binding lookups across global edge nodes
- Sub-millisecond binding table lookups powered by in-memory hash indexes
- Seamless binding updates during live network function container migrations
- Multi-slice binding isolation ensuring confidential slice sessions remain segregated
Specifications
3GPP Rel-19 TS 29.521 Evolution
Interfaces
Nbsf-6gAnycast-Routing-Bus
Related 6G Concepts
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