4.3 Architecture for Fixed Broadband Access network interworking using H(e)NB

23.1393GPP3GPP system - fixed broadband access network interworkingRelease 17Stage 2TS

4.3.1 General

The architecture diagrams highlight the S9a interface between the PCRF and the BBF PCF (BPCF) for Femto access to support use cases and requirements per BBF TR-203 [6], TS 22.220 [14] and TS 22.278 [5].

The function of the S9a interface is to convey sufficient information to the BPCF to enable it to identify the BBF network elements the 3GPP Femto connects to, and perform admission control based on the bandwidth requirements and QoS attributes of a new or modified UE service data flow(s) (via the 3GPP Femto).

The reference architecture focuses on the policy management aspects of the 3GPP-BBF interworking.

NOTE 1: The assumption is that the BBF BNG may be enhanced to support new functionality such as provisioning of policies from the BPCF.

NOTE 2: The connection between the BRAS/BNG and the SeGW is IP transport connection.

NOTE 3: When the 3GPP and Fixed Broadband access networks belong to different Service Providers security arrangement are analogous to those between the H-PCRF and the V-PCRF, and can be based on TS 33.210 [16] or TS 33.310 [17].

4.3.2 Non Roaming Architecture

Figure 4.3.2-1: Non-Roaming Architecture

NOTE 1 The reference architecture is applicable when both 3GPP and Fixed Broadband network belong to the same network operator or to different network operators.

NOTE 2: There is only one S15 session for all UEs connected to a HNB.

4.3.3 Roaming Architecture – Home Routed

The GTP version of the architecture for the macro network does not require V-PCRF in the connection because the HPLMN does not provision QoS rules in the VPLMN. Since there is no V-PCRF in VPLMN the solution relies on the H-PCRF to initiate the Gateway Control Session over S9 to a selected V-PCRF that, in turn, initiates the Gateway Control Session over S9a with the BPCF. The HPLMN may provision policies in the VPLMN that take into account the fact that the UE connects to a 3GPP Femto.

Figure 4.3.3-1: Roaming Architecture – Home Routed Traffic

NOTE 1: The reference architecture is applicable when both 3GPP VPLMN and Fixed Broadband network belong to the same network operator or to different network operators.

NOTE 2: There is only one S15 session for all UEs connected to a HNB.

4.3.4 Roaming Architecture – Visited Access/Local Breakout

The H-PCRF does need to be aware if the UE is connected via the 3GPP Femto in the VPLMN unless Home operators require provisioning of HPLMN policies in the VPLMN.

Figure 4.3.4-1: Roaming Architecture – Visited Access/ Local Breakout

NOTE 1: The reference architecture is applicable when both 3GPP VPLMN and Fixed Broadband network belong to the same network operator or to different network operators.

NOTE 2: There is only one S15 session for all UEs connected to a HNB.