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Overview Siemens

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Contents

1 Overview of the SSS Signaling 3

Overview


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1 Overview of the SSS Signaling

Overview

SIEMENS SIEMENS

Fig. 1


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The final objective of this course is to enable the participant to detect signaling errorsand inconsistencies by means of the protocol tester and of the connection tracer. Theconnection tracer will be used in agreement with Siemens departments. For this

reason, we are going to study various GSM-relevant signaling protocols, the ISDNUser Part and the system internal signaling.

The system-external signaling in accordance with GSM and ITU-CCITT standards isthe main part of this course. The following interfaces of a GSM-PLMN have beenidentified and will be discussed in this course:

the Air interface (interface Um) between mobile station and base station. Thisinterface will be discussed at length in chapter 2.

the A-interface between base station and MSC. This interface will be dealt with inchapter 3 and 4.

the C-interface between MSC and HLR the D-interface between VLR and HLR

the E-interface between MSC

the F-interface between MSC and EIR.

the G-interface between VLR.

These interfaces (C, D, E, F and G) are subject-matters of the chapters 3 and 5.

The B-interface is defined between an MSC and its associated VLR. However, sinceMSC and VLR are always integrated to one D900 entity, we shall not discuss the B-

interface in detail. For the same reason, GSM has dropped, with the introduction ofphase 2, the sophisticated B-interface specifications as they were given in phase 1.

The so-called Abis-interface (BSS internal, between BSC and BTS) is not a subject ofthis course either, since the course is confined to the SSS. The air interface,however, will be dealt with in great detail because it influences directly (via the so-called Direct Transfer Application Part - DTAP, see chapter 4) the SSS proceedings.


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SIEMENS SIEMENS

MSC

VLR

Chapter 3

and 4

Chapter 2

Chapter 3 and 5

MS

A

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E

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Fig. 2 Standardized signaling in a GSM-PLMN


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All the relevant interfaces, with the exception of the air interface, make use of thecommon channel signaling system 7 (CCS7) according to the CCITTrecommendations Q.700 ff.. With this signaling system, the signaling channel has a

packet structure; thus, it can transmit signaling packets of variable length. Thesignaling packets have a frame of fixed format, the Message Transfer Part (MTP).Various User Parts can be embedded into this frame, but only one User Part perframe.

With a GSM-PLMN, the proper call set up utilizes a user channel related User Part(e.g. the ISDN User Part ISDN-UP, or the Telephone User Part TUP). However, thePLMN specific signaling uses throughout the Signaling Connection Control Part(SCCP) which enhances the MTP functions. Application Parts, in due course, can beembedded into the SCCP.

At the A-interface (i.e. between BSS and SSS), the Base Station System Application

Part (BSSAP) is used. On the other hand, the interfaces B, C, D, E, F and G makeuse of the Transaction Capabilities Application Part (TCAP) endowed with the MobileApplication Part (MAP).

The MTP is not a subject-matter of this course; rather, a basic knowledge about theMTP is presupposed. In this connection we refer to the CCS7 basic course. From theuser channel related User Parts, the ISDN-UP will be explained in chapter 7. TheTUP will not be discussed, nor will the methods of Channel-Associated Signaling,since they are no typical for a GSM-PLMN.

The SCCP - as far as D900 relevant - will be treated in chapter 3 of this course.Therefore, this chapter holds for the interface BSS-SSS as well as for the interfaces

between the SSS subunits. Chapter 4 treats the BSSAP whilst TCAP and MAP aredescribed in chapter 5.


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B,C,D,F,G

MTP

SCCP

BSSAP

MTP

SCCP

TCAP

MAPChapter 4

MTP

ISDN-UP

Chapter 6

another MSC

another PLMNPSTN

A

Chapter 3

Chapter 5

SI EMENS SI EMENS

SSS

BSS

Fig. 3 Applications of CCS7 in a GSM-PLMN


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Besides the system-external signaling (by GSM standards), we shall discuss in thiscourse the system-internal signaling (by Siemens standards) as well. Therefore, inchapter 7, we are going to discuss at length the messages, commands, reports and

orders between CP, LTG and CCNC, and in chapter 8, our subject of discussion isgoing to be the so-called Concentrator User Part (CUP), i.e. the signaling betweenLTG and DLU. Here, we shall confine ourselves to the case of the DSU.

It is not possible to trace the system-internal signaling with the K1103. To get theinformations about the message flow between CP and LTG we use the connectiontracer. A part of chapter 7 deals with this tracer.


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Chapter 7

Chapter 8

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Fig. 4 System-internal signaling


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