1、3404583 0073957 872 ETSIK SMG Released by : ETSVFT 12 Release date: February 1992 RELEASE NOTE Report GSM 11.30 Mobile Services Switching Centre Previously distributed version : 3.2.1 (Release 1/90) New Released version February 92 : 3.2.1 (Release 92, Phase 1) 1. Reason for chanaes No changes since
2、 the previously distributed version. 3404583 0073958 i09 ETSI-GSM Technical Specification GSM 11.30 Version 3.2.1 UDC: 621.396.21 Key words: European Digital Cellular Telecommunications System, Global System for Mobile Communications (GSM) European digital cellular telecommunication system (phase 1)
3、; Mobile Services Switching Centre ETSI European Telecommunications Standards Institute ETSI Secretariat: B.P.152 . F - 06561 Valbonne Cedex . France TP. + 33 92 94 42 00 TF. + 33 93 65 47 16 Tx. 47 00 40 F Previous page is blank Copyright European Telecommunications Standards Institute 1992. All ri
4、ghts reserved. No part may be reproduced or used except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to all media in which the information may be embodied. 3404583 0073957 645 PREFATORY NOTE ETSI has constituted sta
5、ble and consistent documents which give specifications for the implementation of the European Cellular Telecommunications System. Historically, these documents have been identified as “GSM recommendations“. Some of these recommendations may subsequently become Interim European Telecommunications Sta
6、ndards (I-RSs) or European Telecornmunications Standards (ETSs), whilst some continue with the status of ETSI-GSM Technical Specifications. These ETSI-GSM Technical Specifications are for editorial reasons still referred to as GSM recommendations in some current GSM documents. The numbering and vers
7、ion control system is the same for ETSI-GSM Technical Specifications as for “GSM recommendations“. INDEX Title 3404583 0073960 367 GSM 11.30 - version 3.2.1 - Page 2 O. SCOPE 1. INTRODUCTION 2. MSC FUNCTIONS 3. CALL ESTABLISHMENT 3.1. MS originating call 3.1.1. Call to PLMN 3.1.1.1. Call to an P.IL
8、2f the same PLMN 3.1.1.2. Call to a MS i another PLMN in the same c mtry 3.1.1.3. Call to a MS -i another PLMN in another country 3.1.2. Call to PSTN 3.1.3. Call to ISDN 3.1.4. Call to PDN 3.2.1. Call from PLMN 3.2. MS terminating call 3.2.1.1. Call from a MS of the same PLMN 3.2.1.2. Cali from a MS
9、 of another PLMN 3.2.1.3. Cai1 from a MS of another PLMN in the same country in another country 3.2.2. Call from PSTN 3.2.3. Call from ISDN 3.2.4. Call from PDN 3.3. Short Message Transfer 3.3.1. MS terminated short messages 3.3.2. MS originated short messages 4. NUMBERING SCHEME 4.1. General 4.2. A
10、ddressing and Identification 4.2.1. MS 4.2.2. BSS 4.2.3. Location area 4.2.4. MSC 4.2.5. HLR 4.2.6. VLR 4.2.7. Emergency Centre 4.2.8. Short Message Service Centre 4.2.9. Equipment identity register 4.2.10. Interworking units 4.2.11. Terminals connected to exchanges 4.2.12. Exchanges in the fixed ne
11、twork(s1 of the PSTN, ISDN, PDN or PLMN 5. TYPES OF CALL ROUTING 5.1. General 5.2. Types of Call 5.3. Call Routing 5.4. Call Routing due to Handover Page 9 10 11 12 12 12 12 12 13 13 14 15 15 16 16 16 17 17 18 18 18 19 19 19 19 19 20 20 20 20 20 21 21 23 23 24 GSM 11.30 - version 3.2.1 - Page 3 6. S
12、UPPORT OF MOBILE SUBSCRIBER SERVICES 6.1. General 6.2. Call handling 6.3. Subscriber authentication 6.4. Emergency calls 6.5. Supplementary services 6.6. Queuing 6.7. Off-air-call-Set-up 6.8. Security related services 6.8.1. Subscriber identity confidentiality 6.8.2. User data confidentiality 6.9. D
13、iscontinuous reception 6.10. Dual tone multi frequency signalling 6.11. Location registration 6.12. Handover 6.13 Short Message Handling 7.1. General 7.2. YSC Interface to the Signalling System -. INTERFACES N0.7 Network 7.2.:. Upper Levels of the interface between MSC and other PLMN entities 7.3. M
14、SC interface with Other Networks 7.3.2.1. MSC to PSPDN 7.3.2.2. MSC to CSPDN 7.3.1. MSC to PSTN/ISDN 7.3.2. MSC to PDNs 7.4. MSC to Radio Subsystem (BSS) Interface 7.4.1. Bearer Circuit 7.4.2. Bearer Circuit for Non-voice Services 7.4.3. Non-Transparent Data Services 7.4.4. Dimensioning of Signallin
15、g and Traffic Channels 7.5. MSC Interface to OMC 7.6. MSC Interface to Emergency Centres ?.?. MSC Interface to Short Message Service Centres (SMS SCs) 7.8. Synchronization 3. DATA COLLECTION 3. OPERATION AND MAINTENANCE LO. SIGNALLING SYSTEM 10.1. General 10.2. SS7 Signalling Network Structure 10.3.
16、 SS7 related functions between MSC and. . : 10.3.1. Another MSC in the same PLMN 10.3.2. BSS 10.3.3. Public Switched (PSI Networks 10.3.4. HLR 10.3.5. VLR 10.3.6. EIR 10.3.7. OMC 10.4. Other signalling systems 11. TRANSMISSION REQUIREMENTS WITHIN THE MSC 12. PERFORMANCE OF THE MSC ANNEX A MSC struct
17、ure, cross reference and indication of 25 25 27 28 28 28 28 29 29 29 29 29 30 30 30 30 31 31 33 34 34 35 36 36 36 37 37 38 38 39 39 40 40 40 41 42 43 43 45 46 46 47 48 48 49 49 49 50 50 50 responsibility A- 1 m 3404583 00739b2 13T = GSM 11.30 - version 3.2.1 - Page 4 The scope of this report is to g
18、ive guidelines concerning the specifications of a Mobile Services Switching Centre (MSC). In the Ease of discrepancy between this report and the approved core GSM recommendations the latter shall prevail. The different functions provided by the MSC are identified with an indication of the relevant r
19、ecommendations where the definitive specifications can be found. It should be noted that this report gr-os example PLMN configurations for the purposes of indicating the mos general routing and interworking scenarios. These example PLMN configurations shall not be interpreted in such a way as to con
20、str 3 network topology, since the internal routing within a country rema:.-s a national matter. For each function, an indication is given as to whether it is mandatory or optional. The purpose of this report is to give an overview of the YSC functions needed to implement the GSM system, in order to
21、help both the administrations/operators in the procurement of their equipments and the manufacturers tendering the MSC. A list of the contents which may be found in a national specification for such equipment is given as an appendix to this report. Note that some items in this list are not specified
22、 by GSM, but are left to the discretion of the operators. 1. The ESC constitutes the interface between the Base Station System (BSS) and the fixed networks. It is a digital exchange able to perform all necessary functions needed to handle the calls to and from mobile subscribers located in the MSC a
23、rea. The architecture of the GSM system is described in Recommendation GSM 03.02. The main difference between a fixed exchange and an MSC is that the MSC has additional functions to cope with the mobile nature of the subscribers. The MSC complies with the 9.500 series CCITT Recommendations. The MSC
24、ensures the correct interworking between the signalling used in the fixed network (normally CCITT No.71, the signalling used at the base station interface and the CCITT No.7 Mobile Application Part (MAP) used between the GSM PLMN functional entities. _ 3404583 0073763 076 GSM 11.30 - version 3.2.1 -
25、 Page 5 The functimal division between the BSS and the MSC is specified in 3ecommendation GSM 08.02. In addition to the normal functions provided by a local exchange in the fixed network, the MSC must perform the following functions: ai the specific call handling function necessary to cope with the
26、mobile nature of the subscribers, e.g. paging b) the management of the radio resource during a call : indication to the BSS about the type of radio channel needed to support the different phases of a communication (e.g. DCCH, TCH). protocol used is specified in the 08 series Recommendatlons; locatio
27、n registration: this procedure needs to be nandled by the MSC to ensure interworking between the MS and the .isitor Locauon Register (VLR) (see Recommendation GSM 03.12) controlled by another BSS during a call, the MSC must perform the transfer of the connection to a new BSS located in its own area
28、or controlled by another MSC (see Recommendation GSM C3.09); f) to ensure the routing of an incoming call to the called mobile, an interrogation of the Home Location Register (HLR) must be the fixed exchanges are unable to perform this interrogation, the call is routed to an MSC which then acts as a
29、 gateway MSC (see Recommendation GSM 03.04) : this qateway MSC function may be implemented in all the MSCs or in some of them. This HLR interrogation function will also need to he performed by an MSC when a MS calls another MS in the same or in some cases another PLMN. z) the management of the signa
30、lling protocol with the 9SS: the 3) e) the hand-over procedure: when a MS moves to a location area performed to obtain the roaming number allocated t3 that YS. _A TC g) to perform the exchange of signalling information with the other mobile functional entities (e.g. VLR, HLR, other MSC), via the Mob
31、ile Application Part (see Recommendation GSM 09.02); h) to handle the interworking functions for data and Dual Tone Multi-Frequency signalling (DTMF) required since the speech encoder is not transparent. i to support the transfer of encryption parameters between VLR and BSS. j) to control the operat
32、ion of echo cancellors (seo Recommendation GSM 09.03 and 03.50). k) to support the Short Message Service (SMSI; the requirements of the MSC to support this service are specified in GSM Recommendation 03.40. 3404583 0073964 TO2 GSM Rec. GSM 11.30 - version 3.2.1 - Page 6 Title I 3. I The purpose of t
33、his chapter is to give an overview of the functions of the MSC in establishing calls from the GSM Mobile Station (YS) or to the MS. Calls to Mobile Subscribers This chapter is based on requiraments of the GSM recommendations shown in table 3.1. Signalling Requirements on Interworking between 1 the I
34、SDN or PSTN and a PLMN I 1 C3.02 1 Network Architecture I I 1 03.03 1 Numbering, Addressing and Identification ! 09.07 1 General requirements on Interworking between the I 09-09 I Detailed Signalling Interworking within the PLMN I I and with the PSTN/ICDN I PLMN and the ISDN or PSTN i l , The MSC pe
35、rforms call handling functions to and from the MSs. Call establishment is described here only from the MSC point of view. Different routing methods in the fixed ISDN/PSTN are represented in GSM Recommendation 03.04. The main assumption of this chapter is that the fixed network (PSTN or ISDN) is not
36、ale to do the routing of calls to the MS by interrogating the HLR, i.e. the optimum routing scenario is not described here. The interrogation to obtain the actual location of the MS is performed by the Gateway MSC, which forwards the call to the MSC where the MS is located (Recommendation GSM 03.04)
37、. This assumption exposes all functions ever needed at the originating MSC, terminating MSC and Gateway MSC (GMSC). However, there are more sophisticated routing principles described in recommendation GSM 03.04. In these methods the interrogation of the HLR is done by the fixed network as early as p
38、ossible during the call establishment. Re-routing can also be used. As a consequence the functions of the GMSC are reduced and better utilization of circuits is achieved, which makes these methods more attractive in the long run. 3404583 0073765 949 H I Cali I I Cali I from 1 PLMN 1 3.1.1 I 3.,.2 i
39、PSTN b to ! PLFIN I I 1 3.2.1 GSM 11.30 - version 3.2.1 - Page 7 l l PDN ISDN I I I i 3*1*3 I 3-1.4 The three evolutionary steps of routing methods employed might be such that in the first phase call forwarding via GMSC is employed. in the next phase re-routing of calls at GMSC can be used, which re
40、quires some new functions in the GMSC and preceding fixed network exchanges. Finally in the third phase the interrogation of the HLR by the ISDN/PSTN represents the most sophisticated method. In this chapter the description of call establishment is based on the call forwarding method. No network int
41、erworking solution with the GSM PLMN and the ISDN or the PSTN has been taken into account here. The GSM PLMN can be interconnected directly to the ISDN and the PSTN, or ir can be connected to the PSTN via the ISDN (recommendation GSM 09.01). The most typical call establishment cases, are described i
42、n The sections given in table 3.2. 3404583 0073966 885 = GSM 11.30 - version 3.2.1 - Page 8 3.1. FIS ORIGINATING CU 3.1.1. U to PLm 3.1.1.1. Wi tn an MS nf Pr,m Figure 3.1 shows a call from an MS to an MS of the same GSM PLMN. During call establishment the originating exchange MSC-A analyzes parr of
43、 the called subscriber ISDN number. It detects from the National Destination Code (N7.C) that the number is a Mobile Subscriber ISDN number belonging to sn MS of the same PLMN. MSC-A then interrogates the HLR to obtain tks Mobile Station Roaming number. According to the roaming number the call is ro
44、uted to MSC-B as described in section 3.2.1.1. I (I 1 (HLR I / I I _. . I fDtVF;Tti 1 I- - I. I - I l f I f il (MS -E I / Figure 3.1. Call from an MS to an MS of the same GSM PLMN GSM 11.30 - version 3.2.1 - Page 9 A MSC internai call is a special case of figure 3.1 where a call from %-A to MS-B is
45、shown. In this case the called MS is located in the same MSC area as the calling MS. During call establishment MSC-A identifies that the dialled Mobile Subscriber ISDN number refers to a ?,IS of the same PLMN. MSC-A interrogates the HLR of the called MS. It receives a Mobile Station Roaming Number l
46、eading to itself. An internal connection from MS-A to MS-B within thr_ MSC 1s established. NO ISDN/PSTN connection is thus needed. The MSC acts both as an originating and terminating exchange. 3.1.1.2. Figure 3.2 shows a call from a MS terminating in a MS of another GSM PLMN in the same country. Aft
47、er analyzing part of the called subscriber ISDN number the originating exchange , MSC-A detects from the National Destination Code (NDC) that the call is headed for another GSM PLMN of the same country. XSC-A interrogates the HLR of the other PLMN and routes the call, according to the XSRN, t MSC-B
48、as described in section 2.2.1.2. Figure 3.2. Call from a MS to a MS of another GSM PLMN in the same country. 3404583 O073968 658 W GSM 11.30 - version 3.2-1 - Page 10 3.1.1.3. Sali tn a MS of rtnather PT,-ther com Figure 3.3 shows a call from a MS terminating in a MC of another GSM PLMN in another c
49、ountry. Figure 3.3. Call from a MS to a MS of another GSM PLMN in another country After analyzing part of the called subscriber ICDN number the I originating exchange MSC-A detects from the international prefix that the call is headed for another country. MSC-A routes the call directly to the international switching centre of the ISDN/PSTN, which sets up the connection to MS-B as described in section 3.2.1.3. M 3404583 00739b9 594 M GSM 11.30 - version 3.2.1 - Page 11 Figure 3.4 shows a call from a MS to a PSTN subscriber. YSC-A acts as an outgomg exchange.
