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GSM TOWARDS LTE NETWORKS
Lecture # 3
SUBSCRIBER IDENIFIERS
SIM MSISDN IMEI IMSI
GSM IDENIFIERS IMEI – International Mobile Equipment Identity
IMEI is an internationally-unique serial number allocated to the MS hardware at the time of manufacture. It is registered by the network operator and (optionally) stored in the AuC
for validation purpose.
MSISDN – Mobile Subscriber ISDN Number
MSISDN represents the true or dialed number associated with the subscriber.It is assigned to the subscriber by the network operator and is stored in the SIM. It is possible for the MS to hold more then one MSISDN.
GSM IDENIFIERSIMSI– International Mobile Subscriber Identifier
When a subscriber registers with a network operator, a unique subscriber IMSI identifier is issued and stored in the SIM of the MS. A mobile station can only function fully if it is operated with a valid SIM inserted into a MS with a valid IMEI.
MSRN – Mobile Station Roaming Number
The MSRN is a temporary, location-dependent ISDN number issued by parent VLR to all MSs within its area of responsibility. It is stored in the VLR and associated HLR but in MS. The MSRN is used by the VLR Associated MSC for all call routing within the MSC/VLR service area.
List of Abbreviations
ACK: Acknowledge. ACM: Answer Complete Message. ANM: Answer Message. APN: Access Point Name. AUC:Authentication Center. BSC: Base Station Controller. BSSMAP: Base Station System Management
Application Part. BTS: Base Transceiver Station. CS1+: Channel signaling. FI: First Interrogation. FIR: First Interrogation Response.
List of Abbreviations
GGSN: Gateway GPRS Support Node. GPRS: General Packet Radio System. HLR: Home Location Register. HO: Handover. HPLMN: Home Public Line Mobile Network. IAM: Initial Address Message IDP: Initial Detect Point. IMSI: International Mobile Subscriber Identification. IN: Intelligent Network. IP: Internet Protocol. ISUP: ISDN User Part.
List of Abbreviations ITSC: International Telephone Switching Center. LAN:Local Area Network. MAP: Mobile Application Part. MGT:Mobile Global Title. MS: Mobile System. MSC: Mobile Switching Center. MSISDN: Mobile Station ISDN Number. MSRN: Mobile Station Roaming Number. PDP: Packet Data protocol. PRN: Provide Roaming Number. SCP: Service Control Point. SGSN: Serving GPRS Support Node.
List of Abbreviations
SPC: Signaling Point Code. SRI: Send Routing Information. SSF: Switching Service Function. SSN: Sub-System Number.
Location Update
Location update request
Location Update Accepted
MSISDN VLR
IMSI = 424-02-624
STP
HLR/AUC
MSC
BSC BTSSSN=7
SSN=6
SSN=254
Call from MS to MS in HPLMN
1. Channel Request
4. SRI
5. PRN
6. PRN
7. SRI
2. AUT REQ & RES
(MSISDN)
(IMSI)
(MSRN)
(MSRN)
8. Paging Global Message
9. Paging Response
10. Setup
11. Alert
3. Setup
12. connect
MAP
BSSMAP
MSISDNIMSI
IMSIMSRN
11. Alert
12. connect
HLRHLR Add.HLR SPCHLR SSN
MSC VLRVLR Add.VLR SPCVLR SSN
BSC
BTS BTS BTSBTS
BSC
SSN=7
SSN=6
SSN=254SSN=254
Call from PSTN to MS in HPLMN
(MSISDN)
(MSISDN)
(IMSI)
(MSRN)
(MSRN)
(MSRN)
7. Paging Global Message
8. Paging Response
9. Setup
10. Alert
12. connect
ISUP
MAP
BSSMAP
MSISDNIMSI
IMSIMSRN
MSC
HLRHLR Add.HLR SPCHLR SSNGMSC
BTSBTS BTS
BSC
VLRVLR Add.VLR SPCVLR SSNSSN=7
SSN=8
SSN=6
SSN=254
Prepaid Call from MS to MS in HPLMN
1. Channel Request
8. SRI
9. PRN
10. PRN
11. SRI
2. AUT REQ & RES
(MSISDN)
(IMSI)
(MSRN)
(MSRN)
12. Paging Global Message
13. Paging Response
14. Setup
15. Alert
3. Setup
16. connect
MAP
BSSMAP
MSISDNIMSI
IMSIMSRN
15. Alert
16. connect
4. IDP
5. FI
6. FIR
7. Connect
CS1+
SCP
MSC
HLRHLR Add.HLR SPCHLR SSN
VLRVLR Add.VLR SPCVLR SSN
BTS BTS BTS
BSCBSC
BTS
SSN=7
SSN=6
SSN=254SSN=254
Handover
1. HO REQ
2. Activation order
4. HO Access Burst
3. New TCH info.
5. Timing Advance
6. HO detected
7. HO complete
Inter MSC Handover
MSC
Old MSC
MSC
New MSC
BSCOld BSC
New BSCBSC
Old BTS
New BTS
SSN=254
SSN=254
SSN=7
SSN=7
SMS Mobile Originating & SMS Mobile Terminating
2. Send SM and
Ack.
1. Service Req.
3. Check SMS sub. & send
SM
4. Send SM
5. Report
6. Ack
7. Routing Info REQ and
RES
8. Forward SM
MSC
STP B-Number
9- Delivered
IMSI/MSC Address scHLRExisting SIMA
Proposal: empower
BSCBTS SSN=7
SSN=254
SSN=6
GPRS
SGSN GGSN
1. Send PDP
2. AUC Check and RES
3. SGSN validates the request
4. Send APN to GGSN
5. GGSN asks for IP6. Send IP
7. Send IP
HLR
BSCBTSSSN=254
SSN=6
WIRELESS ACCESS EVOLUTION
New ServicesNew Services EfficiencyEfficiency More Data More Data
Services Services requiredrequired
Broadband
Subscribers
Voice
CoverageCoverage MobilityMobility
Voice QualityVoice Quality PortabilityPortability CapacityCapacity Data ServiceData Service
BroadbandBroadband Network Network
SimplificationSimplification Cost of Cost of
OwnershipOwnership