A.2 Definitions related to Gateway Location Register (GLR)

23.0023GPPNetwork architectureRelease 17TS

A.2.1 Gateway Location Register (GLR)

This entity handles location management of roaming subscriber in visited network without involving HLR. The location register function in the GLR stores subscription information and routeing information for both CS services and PS services. This entity can be only located in a visited PLMN.

A.2.2 Intermediate Mobile-services Switching Centre (IM-MSC)

This entity is used as serving MSC towards home network and relay some messages between home network and serving MSC. This entity can be only located in a visited PLMN.

A.2.3 Intermediate GPRS Serving Node (IM-GSN)

This entity is used as serving GSN towards home network and relay some PDU notification messages between serving GSN and Gateway GSN. This entity can be only located in a visited PLMN.