Cisco Cisco ASR 5000
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Direct Tunnelling for the S4-SGSN
▀ How It Works
▄ SGSN Administration Guide, StarOS Release 18
Figure 28. RAB Release Procedure with Direct Tunnel
Important:
Operators should not use conversational or streaming class bearers in S4-SGSN.
Iu Release with Direct Tunnel
If the SGSN receives an Iu Release and bearers are activated with direct tunneling, it sends a Release Access Bearer
Request to the S-GW.
Request to the S-GW.
Bearers with a streaming or conversational class will not be included in the Release Access Bearer Request because
these bearers should be deactivated. However, S4-SGSN currently does not support deactivation of streaming or
conversational bearers upon Iu release.
these bearers should be deactivated. However, S4-SGSN currently does not support deactivation of streaming or
conversational bearers upon Iu release.
Important:
Operators should not use conversational or streaming class bearers in S4-SGSN.
Figure 29. Iu Release Procedure with Direct Tunnel