7.4 HSS/AAA-initiated Detach Procedure

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

This procedure is applicable if the UE accesses a Fixed Broadband Access network with GTPv2 or PMIPv6 based S2b interface. And the HSS initiates the detach procedure e.g. when the user’s subscription is removed. The 3GPP AAA Server can initiate the procedure, e.g. instruction from O&M, timer for re-authentication/re-authorization expired.

Figure 7.4-1: HSS/AAA-initiated detach procedure

For connectivity to multiple PDNs, Step 2 shall be repeated for each PDN the UE is connected to. Step 2 can occur in parallel for each PDN.

1. The description of this step is the same as for step 1 in TS 23 402 [3], clause 7.4.2.1.

2. This description of the detach procedure is same as clause 7.3.

3. The description of this step is the same as for step 3 in TS 23 402 [3], clause 7.4.2.1.

NOTE: The HSS/AAA may also send a detach indication message to the PDN GW. The PDN GW does not remove the PMIPv6 or GTPv2 tunnels on S2b, since the ePDG is responsible for removing the PMIPv6 or GTPv2 tunnels on S2b. The PDN GW acknowledges the receipt of the detach indication message to the HSS/AAA.