Cisco Cisco ASR 5000
Direct Tunnelling for the S4-SGSN
▀ How It Works
▄ SGSN Administration Guide, StarOS Release 18
Figure 40. Old SRNS with Indirect Data Transfer
Table 18.
Old SRNS Behaviors
Source RNC
DT Status
DT Status
Direct
Forwarding
Forwarding
S-GW
Relocation
Relocation
Behavior
Supported
No
No
Forward Relocation Request is send with SGW S12 U FTEID. If peer is MME, IDFT
is applied. Then a Create Indirect Data Forwarding Tunnel Request is sent with User
plane FTEID received in the Forward Relocation Response. This will be the eNB
user plane FTEID. The SGW DL forwarding user plane FTEID received in the Create
Indirect Data Forwarding Tunnel Response is sent in the Relocation Command.
is applied. Then a Create Indirect Data Forwarding Tunnel Request is sent with User
plane FTEID received in the Forward Relocation Response. This will be the eNB
user plane FTEID. The SGW DL forwarding user plane FTEID received in the Create
Indirect Data Forwarding Tunnel Response is sent in the Relocation Command.
Supported
Yes
No
Forward Relocation Request is sent with SGW S12 U FTEID. The eNB / RNC user
plane FTEID received in the Forward Relocation Response is sent in the Relocation
Command.
plane FTEID received in the Forward Relocation Response is sent in the Relocation
Command.