для Cisco Cisco Packet Data Gateway (PDG)
Evolved Packet Data Gateway Overview
How the ePDG Works ▀
ePDG Administration Guide, StarOS Release 17 ▄
63
Step
Description
2.
The ePDG also begins to tear down the S2b PMIP session by sending a PBU (Proxy-MIP Binding Update) De-registration
message to the P-GW.
message to the P-GW.
3.
The ePDG responds to the UE’s IKEv2 INFORMATIONAL (DELETE) Request message with an IKEv2
INFORMATIONAL (DELETE) Response message.
INFORMATIONAL (DELETE) Response message.
4.
On receiving the PBU (Proxy-MIP Binding Update) De-registration message, the P-GW disconnects the UE session and
releases local resources. The P-GW completes the disconnection of the WLAN UE session and responds to the ePDG with
a PBA De-registration message.
releases local resources. The P-GW completes the disconnection of the WLAN UE session and responds to the ePDG with
a PBA De-registration message.
5.
The ePDG disconnects the SWu session by sending an STR (Session Terminate Request) message to the 3GPP AAA/HSS.
6.
The 3GPP AAA clears the SWu sessions and responds to the ePDG with an STA (Session Terminate Acknowledgment)
message.
message.
P-GW-initiated Session Disconnection
The figure below shows the message flow during a P-GW-initiated session disconnection. The table that follows the
figure describes each step in the message flow.
figure describes each step in the message flow.
Figure 15. P-GW-initiated Session Disconnection
Table 14. P-GW-initiated Session Disconnection
Step
Description