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GSM TOWARDS LTE NETWORKS

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

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GSM TOWARDS LTE NETWORKS

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  1. GSM TOWARDS LTE NETWORKS Lecture # 3

  2. SUBSCRIBER IDENIFIERS SIM MSISDN IMEI IMSI

  3. 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.

  4. GSM IDENIFIERS IMSI– 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.

  5. 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.

  6. 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.

  7. 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.

  8. List of Abbreviations SPC: Signaling Point Code. SRI: Send Routing Information. SSF: Switching Service Function. SSN: Sub-System Number.

  9. Location Update

  10. Location update request IMSI = 424-02-624 SSN=254 BSC BTS SSN=7 Location Update Accepted STP HLR/AUC SSN=6 MSISDN  VLR

  11. Call from MSto MS in HPLMN

  12. HLR HLR Add. HLR SPC HLR SSN MAP IMSIMSRN (MSISDN) 4. SRI SSN=6 7. SRI (MSRN) VLR VLR Add. VLR SPC VLR SSN 6. PRN (MSRN) SSN=7 5. PRN MSISDNIMSI (IMSI) 2. AUT REQ & RES 8. Paging Global Message 11. Alert 10. Setup BSC BSSMAP BSC SSN=254 SSN=254 12. connect 1. Channel Request 12. connect 3. Setup BTS BTS BTS BTS    11. Alert 9. Paging Response

  13. Call from PSTN to MS in HPLMN

  14. HLR HLR Add. HLR SPC HLR SSN  (MSISDN) (MSISDN) MAP SSN=6 SSN=8 ISUP (MSRN) MSISDNIMSI IMSIMSRN (MSRN) (MSRN) VLR VLR Add. VLR SPC VLR SSN (IMSI) SSN=7 7. Paging Global Message BSSMAP BSC 9. Setup SSN=254 12. connect 8. Paging Response BTS BTS BTS   10. Alert

  15. Prepaid Call from MSto MS in HPLMN

  16. HLR HLR Add. HLR SPC HLR SSN 5. FI MAP (MSISDN) IMSIMSRN 8. SRI 4. IDP SSN=6 11. SRI 6. FIR (MSRN) VLR VLR Add. VLR SPC VLR SSN CS1+ 10. PRN 7. Connect (MSRN) SSN=7 9. PRN MSISDNIMSI (IMSI) 2. AUT REQ & RES 15. Alert 14. Setup 12. Paging Global Message SSN=254 BSC BSSMAP BSC SSN=254 16. connect 1. Channel Request 16. connect 3. Setup BTS BTS BTS BTS    15. Alert 13. Paging Response

  17. Handover

  18. SSN=7 SSN=254 1. HO REQ Old BTS BSC Old MSC Old BSC  Inter MSC Handover 5. Timing Advance 4. HO Access Burst 7. HO complete 3. New TCH info. New BTS BSC 2. Activation order New BSC New MSC SSN=7 6. HO detected SSN=254

  19. SMS Mobile Originating & SMS Mobile Terminating

  20. 1. Service Req. SSN=254  BTS BSC 6. Ack SSN=7 2. Send SM and Ack. 3. Check SMS sub. & send SM  9- Delivered B-Number 5. Report 8. Forward SM 4. Send SM HLR sc IMSI/MSC Address Existing SIMA SSN=6 7. Routing Info REQ and RES Proposal: empower

  21. GPRS

  22. SGSN GGSN SSN=6 HLR 3. SGSN validates the request 5. GGSN asks for IP 6. Send IP 2. AUC Check and RES 1. Send PDP 4. Send APN to GGSN  BTS BSC SSN=254 7. Send IP

  23. WIRELESS ACCESS EVOLUTION Subscribers • Broadband • Network Simplification • Cost of Ownership • New Services • Efficiency • More Data Services required • Voice Quality • Portability • Capacity • Data Service • Coverage • Mobility 2G 4G 3G 1G Voice Broadband

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