The present document describes the use of a Gateway Location Register within the UMTS Core Network as a means of reducing the amount of MAP signalling traffic associated with location management carried over inter-PLMN links for roaming users.
One of the requirements of the present document is to describe a network architecture where the presence of a GLR within a UMTS PLMN is not visible to either a second generation PLMN (i.e. GSM release 98 or earlier) or a 3G PLMN (i.e. GSM Release 99 or later). So the objective of this report is that changes to GSM specified interfaces or procedures will not be needed in order to:
integrate a GLR into a UMTS PLMN;
allow interworking between a GLR-enabled UMTS network and a GSM or UMTS network without a GLR.
The present document will be restricted to the study of the case where the GLR supports one VPLMN only. A separate TR will be required if support of multiple VPLMNs by the GLR is to be studied.
The present document will study support of multiple HPLMNs by the GLR.