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9/ 038 13 - EN/LZU 108 852 R4A GSM System Survey Slide 1 Chapter 9: Traffic Cases
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9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 1
Chapter 9: Traffic Cases
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 2
Chapter 1 - Objectives
After completing this chapter, participants will be able to:• List 1 purpose per GSM ID-number (MSISDN, IMSI, TMSI,
MSRN and LAI) and why we use these• Briefly explain the meaning of handover, locating and
location updating• Briefly explain different traffic case situations
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 3
CME 20 MSISDN
9600605
National mobile number
International Mobile StationISDN number
MSISDN = CC + NDC + SN
CC NDC SN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 4
CMS 40 MSISDN
9600606
National mobile number
International Mobile StationISDN number
MSISDN = CC + NPA + SN
CC NPA SN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 5
IMSI
9600607
Maximum 15 digits
3 digits 2-3 digits
National MSI
IMSI
IMSI = MCC + MNC + MSIN
MCC MNC MSIN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 6
IMEI
9600608
6 digits 2 digits 6 digits 1 digit
IMEI
IMEI = TAC + FAC + SNR + spare
TAC FAC SNR spare
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 7
IMEISV
9600609
6 digits 2 digits 6 digits 2 digits
IMEISV
IMEISV = TAC + FAC + SNR + SVN
TAC FAC SNR SVN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 8
MSRN
9600611
MSRN
MSRN = CC + NDC + SN
CC NDC SN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 9
LAI
9600612
3 digits 2-3 digits Max. 16 bits
LAI
LAI = MCC + MNC + LAC
MCC MNC LAC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 10
CGI
9600613
3 digits 2-3 digits Max. 16 bits Max. 16 bits
Location Area Identity
Cell Global Identity
CGI = MCC + MNC + LAC + CI
MCC MNC LAC CI
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 11
BSIC
9600614
BSIC
BSIC = NCC + BCC
NCC BCC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 12
LN
9600615
LN
LN = CC + NDC + LSP
CC NDC LSP
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 13
RSZI
9600616
RSZI
RSZI = CC + NDC + ZC
CC NDC ZC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 14
Traffic Cases When MS Is in Idle Mode
9600870
MSC/VLR-A(LA1 + LA2)
MSC/VLR-B(LA3)
LA1
LA2
LA3
1. 2.
5.
3.6.
8.
4.
1. IMSI attach2. Location updating, type IMSI attach3. Changing cells within an LA4. Location updating, same MSC/VLR5. Location updating, new MSC/VLR6. Location updating type periodic registration7. IMSI detach8. Implicit detach
7.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 15
IMSI Attach
9600873
MSC/VLRBSC/TRC
BTS 2.
1.
3.
4.
4.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 16
Location Updating, same MSC/VLR
9805057
BSC/TRC MSC
4.
3.
2.
1.2.
3.
4.
HLR
VLR
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 17
Location Updating, new MSC/VLR
9805058
BSC/TRC MSC
4.4.
HLR
VLR
2.
3.
3.
1.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 18
Cases Which Activate an MS and Cases When MS Is in Active Mode
9600874
1. Call from MS (speech, fax, data, short message)2. Call to MS (speech, fax, data, short message, cell broadcast)3. Handover - intra - BSC4. Handover - inter - BSC, intra - MSC5. Handover - inter - MSC
1.
2.
3. 4.
5.
BSC/TRC
MSC/VLR-A
MSC/VLR-B
BSC/TRC
BSC/TRC
GMSC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 19
Call set-up MS to PSTN
9600875
BSC/TRC
4.
3.
2.
1.
4.
1.
2.
3.
4.
GSM/PLMN
5.MSC/VLR TE
PSTN
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 20
Call to MS from PSTN
9600876
HLR
GSM/PLMN PSTN
MSC/VLR
GMSCLocal
exchange
11.
10.
9.
8.
8.9.
10.
11.
7. 11.
8.
8.
5.
4.
3.
2.
5.1.
6.
1.
BSC/TRC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 21
Measurements sent to BSC
9600877
Evaluationand decision
about handover
Measurements from RBS and MS
RBS measures:Signal strength andtransmission qualityon TCH, uplink
MS measures:Signal strength andtransmission qualityon TCH, downlink
Signal strengthfrom neighboringBTS
Measurementreports from MSare sent to RBS
BSC/TRC
MSC/TRC
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 22
Handover: Cells Controlled by the Same BSC
9600878
old
new
BSC
2.
6.
1.
5.
3.
4.
5.
2.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 23
Handover: Different BSCs but the same MSC/VLR
9600879
oldBSC/TRC
4.
9.
3.
7.
5.
6.
7.
4.
newBSC/TRC
MSC
1.
4.
8.
4.
7.
2.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 24
Handover: Cells Controlled by Different MSCs
9600880
oldBSC/TRC
4.
5.
8.
9.
10.
7.
newBSC/TRC
MSC-A1.
7.
3.
MSC-B10.
2. 5. 10.
GSM PLM PSTN
11.
6.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 25
Traffic Case Showing the Advantage of Using Dropback
9805162
Case 1: Without dropback Case 2: With dropback
MSC/VLR (France) GMSC (Sweden)
A B
MSC/VLR (France) GMSC (Sweden)
A B
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 26
Mobile Originating Short Message
9601062
MSC/VLR SMS-C2.
1.
2.
9/ 038 13 - EN/LZU 108 852 R4A GSM System SurveySlide 27
Mobile Terminating Short Message
9601061
HLR
SMS - GMSCSMS - C MSC/VLR
1.
2.
8.
4. 3.
5.
6.
7.
