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Content for  TS 29.016  Word version:  16.0.0

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0  IntroductionWord‑p. 4

The present document specifies or references the necessary information to provide a reliable transfer of signalling messages between the Serving GPRS Support Node (SGSN) and the Visitors Location Register (VLR). This reliable transfer of messages is provided by the Network Service Part (NSP) of the Signalling System No 7 (SS7). This documents specifies or references the subset of MTP and SCCP to be used in the Gs interface.

1  ScopeWord‑p. 5

The present document specifies or references the subset of MTP and SCCP which is used for the reliable transport of BSSAP+ messages in the Gs interface. The present document references the TS 29.202 which specifies alternative transport layers that can be applied instead of the MTP. The present document also specifies the SCCP addressing capabilities to be provided in the Gs interface.
The present document is divided into two main parts, clause 5 dealing with the use of MTP and clauses 6 and 7 dealing with the use of SCCP.
Clause 5 of the present document deals with the subset of the MTP that is required between an SGSN and a VLR. It is intended that this implementation of MTP is compatible with a full MTP implementation. Clause 4 references the TS 29.202 which specifies alternatives to the MTP.
The SCCP is used to provide message routing between the SGSN and the VLR. The SCCP routing principles specified in the present document allow to connect one SGSN to several VLR. No segmentation at SCCP level is needed on the Gs interface. Only SCCP class 0 is used on the Gs interface. Clauses 6 and 7 identify the SCCP subset that should be used between an SGSN and an VLR.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • 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.

2.1  Normative references

[1]  Void.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 22.060: "General Packet Radio Service (GPRS); Service description; Stage 1".
TS 23.003: "Numbering, addressing and identification".
TS 43.022: "Functions related to Mobile Station (MS) in idle mode and group receive mode".
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
TS 48.006: "Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface".
TS 48.008: "Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification".
TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".
TS 29.002: "Mobile Application Part (MAP) specification".
TS 49.008: "Application of the Base Station System Application Part (BSSAP) on the E-interface".
TS 29.018: "General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface Layer 3 specification".
ITU-T Recommendation E.164: "The international public telecommunication numbering plan".
ITU-T Recommendation Q.711: "Functional description of the signalling connection control part".
ITU-T Recommendation Q.712: "Definition and function of signalling connection control part messages".
ITU-T Recommendation Q.713: "Signalling connection control part formats and codes".
ITU-T Recommendation Q.714: "Signalling connection control part procedures".
ITU-T Recommendation Q.702: "Signalling data link".
ITU-T Recommendation Q.703: "Signalling link".
ITU-T Recommendation Q.704: "Signalling network functions and messages".
ITU-T Recommendation Q.707: "Testing and maintenance".
ANSI T1.111 (1996):"Signalling System No. 7 (SS7); Message Transfer Part".
ANSI T1.112 (1996): "Signalling System No. 7 (SS7); Signalling Connection Control Part Functional Description".
TS 29.202: "Signalling System No. 7 (SS7) signalling transport in core network; Stage 3".

2.2  Informative referencesWord‑p. 6

TS 22.001: "Principles of telecommunication services supported by a GSM Public Land Mobile Network (PLMN)".
TS 22.002: "Circuit Bearer Services (BS) supported by a Public Land Mobile Network (PLMN)".
TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)".
[26]  Void.
[27]  Void.
TS 43.064: "Overall description of the GPRS Radio interface; Stage 2".
TS 24.002: "GSM - UMTS Public Land Mobile Network (PLMN) access reference configuration".
TS 24.007: "Mobile radio interface signalling layer 3; General aspects".
TS 24.008: "Mobile radio interface layer 3 specification; Core network protocols; Stage 3".
TS 44.065: "Mobile Station (MS) - Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP)".
TS 48.060: "Inband control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels."
TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface".
TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting Packet Based services and Packet Data Networks (PDN)".
[36]  Void.
[37]  Void.
[38]  Void.
[39]  Void.
[40]  Void.

3  Definitions, symbols and abbreviationsWord‑p. 7

Unless listed below, the definitions, symbols and abbreviations are listed in TR 21.905 and TS 23.060.

4  Configuration of the Gs interface

The Gs interface connects the Serving GPRS Support Node (SGSN) to the Visitors Location Register (VLR). This interface is defined in the 64 kbit/s for E1 interface and for 64 kbit/s or 56 kbit/s for T1 interface boundary of an SGSN to a VLR or of a VLR to an SGSN. The configuration of the Gs interface shall not impose any restriction on the number of VLRs or SGSNs to be connected by the Gs interface. The Gs interface definition shall support an early implementation of GPRS when one SGSN may be connected to several VLRs or a more mature implementation when several SGSNs may be connected to one VLR. Therefore the interface shall support the use of an STP.
The level of resilience in the Gs interface is determined by the operator, however it is recommended that the operator considers the use of more than one multiplex system between the SGSN and the VLR. Each multiplex system should be used to carry one signalling link and routing diversity should be provided among the signalling links to increase the resilience of the system.

4.1  Use of Protocol Stacks

BSSAP+ shall be transported over SCCP and the transport layers specified in TS 29.202. The protocol stack is shown in figure 4.1.
When MTP is used to transport BSSAP+ then the conformance rules specified in clause 5 shall apply.
Reproduction of 3GPP TS 29.016, Figure 4.1: Protocol stack for the transportation of BSSAP+

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