School of Specs 23.501v20.2.0

3GPP 23.501 v20.2.0 — the document's own text

6.3.7.0 General principles

Taught in 6. How one function finds another (The 5G system architecture, in depth).

Clause 6.3.7.0 describes the underlying principles for PCF selection and discovery:

  • There may be multiple and separately addressable PCFs in a PLMN.
  • The PCF must be able to correlate the AF service session established over N5 or Rx with the associated PDU Session (Session binding) handled over N7.
  • It shall be possible to deploy a network so that the PCF may serve only specific DN(s). For example, Policy Control may be enabled on a per DNN basis.
  • Unique identification of a PDU Session in the PCF shall be possible based on the (UE ID, DNN)-tuple, the (UE (IP or MAC) Address(es), DNN)-tuple and the (UE ID, UE (IP or MAC) Address(es), DNN).