E.4.1 Introduction

29.2133GPPPolicy and charging control signalling flows and Quality of Service (QoS) parameter mappingRelease 17TS

From the network scenarios listed in clause 4.0, in order to support interworking with Fixed Broadband access network, three distinct network scenarios are defined as follows:

– the Case 1 (no Gateway Control Session over Gxx reference point) applies to GTP-based S2a or GTP-based S2b, trusted S2c and GTP-based S5/S8 H(e)NB scenarios.

– the Case 2a (the same Gateway Control Session over Gxx reference point) applies to untrusted S2c.

– the Case 2b (a Gateway Control Session over Gxx reference point per IP-CAN Session) applies to PMIP-based S2b and PMIP-based S5/S8 H(e)NB scenarios.

NOTE: No policy interworking solution based on S9a is defined for Fixed Broadband access interworking via S2a in this Release.

Additionally, for case 1, the PCRF checks whether the CoA information is included in the CC-Request command to differentiate the GTP-based S2b case and trusted S2c case. If it is included, the trusted S2c case applies; otherwise, the GTP-based S2b case applies.