Cisco Cisco ASR 5000

S4-SGSN Suspend-Resume Feature

▀ How it Works

▄ SGSN Administration Guide, StarOS Release 18

Figure 82. Intra-SGSN Suspend Procedure with Intra-RAU as Subsequent Procedure

Inter-SGSN Suspend and Resume Procedure with Peer S4-SGSN/MME

The procedure for a new SGSN Suspend Request and Resume procedure with a peer S4-SGSN/MME is shown in the
following diagram.



When an S4-SGSN receives a Suspend Request from the BSS and if the subscriber is not attached to the 2G

SGSN, the S4-SGSN will send a Suspend Notification to the peer S4-SGSN/MME.



The new SGSN RAU is the Resume procedure after a new SGSN Suspend procedure has been completed. The

SGSN sends a Create Session Request / Modify Bearer Request to the SGW which subsequently is sent to the
PGW to resume all data transmissions on non-GBR bearers.



When the Gn-SGSN receives a Suspend Request from the BSS and if the subscriber is not attached to the 2G

SGSN, it sends a Suspend Notification to the peer Gn-SGSN / S4-SGSN/MME.