Cisco Cisco ASR 5000

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PDN Connection Release Initiated by HSGW
This section describes the procedure of a session release by the HSGW.
Figure 9: PDN Connection Release by the HSGW Call Flow
Table 5: PDN Connection Release by the HSGW Call Flow Description
Description
Step
The UE is attached to the EPC and has a PDN connection with the P-GW for PDN-ID=x and APN
with assigned HNP.
1
The HSGW MAG service triggers a disconnect of the PDN connection for PDNID=x.
2
The HSGW sends a PPP VSNCP-Term-Req with PDNID=x to the UE.
3
The UE acknowledges the receipt of the request with a VSNCP-Term-Ack (PDNID=x).
4
The HSGW begins the tear down of the PMIP session by sending a PBU Deregistration to the P-GW
with the following attributes: Lifetime=0, MNID, APN, HNP. The PBU Deregistration message
should contain all the mobility options that were present in the initial PBU that created the binding.
5
HSGW Administration Guide, StarOS Release 19    
31
HRPD Serving Gateway Overview
PDN Connection Release Initiated by HSGW