09.183GPPGeneral Packet Radio Service (GPRS)Gs interface layer 3 specificationServing GPRS Support Node (SGSN) - Visitors Location Register (VLR)TS
This Technical Specification (TS) has been produced by the 3rd Generation Partnership Project (3GPP).
The present document specifies procedures used between the Serving GPRS Support Node (SGSN) and the Visitors Location Register (VLR) for co-ordination between GSM circuit switched services and GSM packet data services within the 3GPP system.
The contents of the present document are subject to continuing work within TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.