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jolly, 01/29/2024 03:40 PM


!This is Work-In-Progress!

Setup of this example

  • Ericsson RBS 6402 (eNodeB)
  • Open5GS (4G network elements)
  • OsmoHLR with OsmoDia2GSUP (HSS)
  • OsmoMSC (SMS)


When all phones are Idle, one will see the following trace with Wireshark on the link between eNodeB (Ericsson RBS) and MME (Open5GS).

Wireshark eNB Idle

The eNodeB (IP is connected to MME (IP via SCTP. Also the eNodeB syncs its clock to NTP server (IP

The network is the RAN network in this example.

4G Attachment

A 4G phone is attached to the network, using SIM cards that is registered in the HSS. The APN name used is "internet".

Lets go into detail:

Attach request

ESM information request

ESM information response

Attach accept

Attach complete

4G Detachment

The 4G phone is turned off or the airplane mode is turned on.

Lets go into detail:

h.3 Detach Reqeust

h.3 UE context release

Updated by jolly 5 months ago · 16 revisions

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