The present document specifies or references the procedures to provide co-ordination between the GSM circuit switched services controlled at the Visitors Location Register (VLR) and the GSM packet switched services controlled at the Serving GPRS Support Node (SGSN). The procedures specified in the present document are intended to optimise the use of the resources when an MS supports both GSM circuit switched services and GSM packet switched services.
The present document specifies or references procedures used on the Serving GPRS Support Node (SGSN) to Visitors Location Register (VLR) interface for interoperability between GSM circuit switched services and GSM packet data services.
The present document specifies the layer 3 messages and procedures on the Gs interface to allow coordination between databases and to relay certain messages related to GSM circuit switched services over the GPRS subsystem.
The functional split between VLR and SGSN is defined in
TS 23.060. The required procedures between VLR and SGSN are defined in detail in the present document.
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
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References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
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For a specific reference, subsequent revisions do not apply.
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For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
For the purposes of the present document the definitions, symbols and abbreviations given in
TR 21.905 and in
TS 23.060 apply. Additionally the following terms and definitions of
TS 23.251 apply:
Common PLMN
Gateway core network (GWCN)
Non-supporting UE
Supporting UE