9.1.1 E-UTRAN Initial Attach and UE requested PDN connection Establishment

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

This clause is related to the case when the UE performs initial attachment or UE requests connectivity to an additional PDN to the E-UTRAN network via a HeNB. The HeNB is already registered in the network.

The HeNB sends the HeNB local IP address and the UDP port if NAT/NAPT is detected in the fixed Broadband access networks to the MME in UE associated S1 signalling (refer to the definition of Initial UE Message in TS 36.413 [29]).

Figure 9.1.1: UE Attach and UE requested PDN connection Establishment procedure via HeNB

1. The HeNB is already registered in the network.

2. The description of this step is the same as for step 1 and 2 in TS 23.401 [2], clause 5.3.2.1 (Initial attach case), or is the same as for step 1 in TS 23.401 [2], clause 5.10.2 (UE requested PDN connection Establishment case) with the addition that HeNB includes the following additional information: the HeNB local IP address and the UDP port if NAT/NAPT is detected in the S1 signalling (refer to the definition of Initial UE Message in TS 36.413 [29]) and sends them to MME.

3. This step is the same as steps 3-13 in TS 23.401 [2] clause 5.3.2.1 (Initial attach case) or steps 2-3 in TS 23.401 [2] clause 5.10.2 (UE requested PDN connection Establishment case), with the following additional information included in Create Session Request message sending between MME and S-GW, and between S-GW and P-GW: HeNB Local IP address and the UDP port if NAT/NAPT is detected.

4. The PDN GW initiates the IP-CAN session establishment/modification procedure with the PCRF per TS 23.203 [4]. The message includes the IMSI, the HeNB local IP address and the UDP port if NAT/NAPT is detected.

5. The PCRF sends the Gateway Control Session establishment/QoS Rules provisioning message to the BPCF according to TS 23.203 [4]. The message includes the IMSI, HeNB local IP address and UDP port if NAT/NAPT is detected.

Once this step completes the PCRF is aware the fact that the UE is connected to the network via a 3GPP H(e)NB and checks first whether sufficient resources are available in the BBF access before it provisions PCC rules at the PCEF.

6. The PCRF acknowledges the IP‑CAN session establishment/modification.

7. This step is the same as steps 15-26 in TS 23.401 [2] clause 5.3.2.1 (Initial attach case) or steps 5-16 in TS 23.401 [2] clause 5.10.2 (UE requested PDN connection Establishment case) with the following additions: If the H(e)NB local IP address and UDP port number change reporting triggers are received from the PCRF, the PDN GW should set the H(e)NB local IP address and UDP port number Information Reporting accordingly. If the H(e)NB local IP address and UDP port number Reporting Request is received for this PDN connection, then the MME shall report to the PCEF/PCRF changes of HeNB local IP address and/or port (if available).