Cisco Cisco Packet Data Gateway (PDG)

 

▄  SaMOG Administration Guide, StarOS Release 18 

 

 

19. 

The CGW originates a "GTPv2 Create Session Request" message on the S2a interface towards PDN-GW, by including S2a 
GTP-U TEID to be used for downlink data transfer, MSISDN, IMSI, APN, PAA, PDNType, Bearer-Context-List, APN-
AMBR and Charging characteristic. 

20. 

The PDN-GW allocates the requested IP address for the subscriber and responds to the CGW with a "GTPv2 Create 
Session Response" message by including the Cause, PAA, Bearer-Context-List, APN-AMBR and GTP-U PGW TEID for 
uplink data transfer. 

21. 

The CGW responds with a "PMIPv6 PBA" to the WLC, by including the UEs IP address.  

22. 

A GTPv2 tunnel is established between the CGW and P-GW. 

23. 

A PMIPv6 tunnel is established between the WLC and CGW. 

24. 

The WLC initiates a "Radius Accounting-Request" with "Acct-Status-Type" as "Start" and by including the assigned UEs 
address. 

25. 

The MRME proxies the received "Radius Acconting-Request" towards the RADIUS accounting server. 

26. 

The MRME receives the "Radius Accounting-Response" from the Radius accounting server. 

27. 

The MRME proxies the received "Radius Acconting-Response" towards the WLC. 

 

The figure below shows an SaMOG Gateway session establishment flow in Release 18 and later. The table that follows 
the figure describes each step in the flow.