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When is exactly Local Breakout happens and what S9 interface does?

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When is exactly Local Breakout happens and what S9 interface does?
posted Apr 7, 2014 by Hiteshwar Thakur

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1 Answer

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In Roaming Scenarios two different roaming architectures are defined:

  • Roaming with Home Routed traffic
  • Roaming with Local Breakout

In first case: UE is latched to visited network (Other PLMN) and using E-UTRAN, MME, S-GW of Visited Network but P-GW will belong to his Home Network (S8-Interface). So here the UE is still connected to his Home PDN-GW.

In Second case: UE is latched to visited network (Other PLMN) and using E-UTRAN, MME, S-GW and P-GW too. So here UE is not connected to his Home PDN-GW. This is where Local BreakOut Happens.

Local Breakout: comes in to picture in second scenario explained above. It enables visitor networks to breakout Internet sessions into home network, instead of routing back to Home networks.

Role of Diameter S9 interface:

  • S9 interface lies between the H-PCRF and the V-PCRF (Policy Charging and Rules Function)
  • These functions use Diameter to exchange information about the quality of service a roaming customer should get as well as charging information once Local Breakout has begun.
answer Apr 29, 2014 by Mishthy Mukherjee
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Some In-Roamers are seen using visited PLMN’s MME, SGW but they are still using home PGW even though static selection of SGW & PGW are configured in MME for all roaming MCC+MNC. That mean any visitor will Locally break out and use specific SGW & PGW for IMS and Internet APN. But few subscribers seen using their home PLMN PGW for IMS APN. What are the scenarios that can trigger the visitor to use their home PGW. Once purged from MME then subscriber start using visited network’s SGW and PGW, which is an expected behaviour. Also these few random subscribers have switched off and switched on their device and also hover between VoWiFi / Volte during their stay multiple times still the PGW used is their home PGW.
Please help to understand and decode this scenario.

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