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GSM N ETWORK A RCHITECTURE

CH 2. GSM N ETWORK A RCHITECTURE. GSM N ETWORK A RCHITECTURE. In this chapter we will see : GSM NETWORK ARCHITECTURE The Radio Subsystem The Network Switching Subsystem The Operation and maintenance Subsystem Geographic network areas. GSM N ETWORK A RCHITECTURE.

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GSM N ETWORK A RCHITECTURE

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  1. CH 2 GSMNETWORK ARCHITECTURE

  2. GSMNETWORK ARCHITECTURE • In this chapter we will see : • GSM NETWORK ARCHITECTURE • The Radio Subsystem • The Network Switching Subsystem • The Operation and maintenance Subsystem • Geographic network areas

  3. GSMNETWORK ARCHITECTURE • GSM NETWORK ARCHITECTURE

  4. GSMNETWORK ARCHITECTURE OMC

  5. GSMNETWORK ARCHITECTURE

  6. GSMNETWORK ARCHITECTURE -The Mobile station(MS) Monitoring power & quality of its BTS

  7. GSMNETWORK ARCHITECTURE • -The Mobile station(MS) • 1- Mobile equipment (ME) • it is the terminal used by user • Can be purchased from any store • Without SIM no calls can be made • It has an International Mobile Equipment Identity (IMEI)

  8. IDENTITY NUMBERS

  9. GSMNETWORK ARCHITECTURE 2- Subscriber identity module (SIM) An electronic microchip for storing information

  10. IDENTITY NUMBERS

  11. IDENTITY NUMBERS

  12. IDENTITY NUMBERS

  13. IDENTITY NUMBERS

  14. IDENTITY NUMBERS

  15. GSMNETWORK ARCHITECTURE • -The base station subsystem (BSS) • 1- The Base Transceiver station(BTS) • it contains the RF transmission equipment • Each cell has one BTS • Each BTS consists of one or more transceiver • It has an International cell global Identity (CGI) • It has Base station identity code (BSIC) • It performs channel coding, ciphering and modulation

  16. Different elements of RBS or BTS

  17. Different elements of RBS or BTS • DXU: Distribution Switch Unit • TRU: Transceiver unit • CDU: Combining and Distribution Unit • ECU: Energy Control Unit  ECU contains PSU,BFU, AC connection unit  PSU: Power Supply Unit  BFU : Battery Fuse Unit

  18. BaseTransceiverstation

  19. GSMNETWORK ARCHITECTURE • 2- The base station controller (BSC) • -It carries out all control functions in the BSS as: • Paging • Channel allocation • Dynamic power control • Handover • Frequency hopping

  20. GSMNETWORK ARCHITECTURE • The base station controller (BSC) Remote BTS BTS BTS BSC Co-located BTS

  21. GSMNETWORK ARCHITECTURE • 3- The transcoding and rate adaptation unit (TRAU) • It is used for speech compression/decompression • Also adaptation of data to the requirement of the air interface 64 16 64 13 MSC 16 BSC VLR 64 16V 16 16 16 16 64 16

  22. Transcodingandrateadaptationunit

  23. GSMNETWORK ARCHITECTURE BSS Link configuration - Cascade BTS BSC BTS BTS BTS BTS

  24. GSMNETWORK ARCHITECTURE BSS Link configuration - loop BTS BSC BTS BTS BTS

  25. GSMNETWORK ARCHITECTURE BSS Link configuration - Star BTS BTS BTS BTS BTS BSC

  26. GSMNETWORK ARCHITECTURE • - The Mobile service switching center (MSC) • -It is an electronic computerized exchange provides the interface between MS and the fixed network • -It will not contain any subscriber parameters • Charging • Switching and call routing • Communication with HLR and VLR • Communication with other MSCs • Control of connected BSCs

  27. MobileServicesSwitchingCentre

  28. GSMNETWORK ARCHITECTURE • The MSC is connected to: • HLR (Home location register) • VLR (Visitor location register) • AUC (Authentication register) • EIR (Equipment identity register)

  29. GSMNETWORK ARCHITECTURE • HLR (Home location register) • The centralized database that stores and manages • all mobile subscription parameters • HLR contains : • Subscriber identification numbers (IMSI,MSISDN) • Subscriber current location information (MSC/VLR) • Subscriber authentication information • Charging • Subscriber type

  30. GSMNETWORK ARCHITECTURE • 2. VLR (Visitor location register) • A temporary storage location for subscription • information for MSs which are within MSC service area • VLR contains : • Mobile status (free, busy,…etc) • Temporary MS identity (TMSI) • Temporary MS roaming number (MSRN)

  31. GSMNETWORK ARCHITECTURE • Authentication • - It is a processor system that performs the authentication function AUC IMSI Ki Database IMSI,Ki RAND Request for Triplet from HLR,VLR A3 A8 Triplet RAND SERS Kc Triplet

  32. GSMNETWORK ARCHITECTURE • 4. EIR (Equipment identity register) • As the subscriber and equipment are separate in GSM so we • use a separate authentication process for MS equipment • EIR is a centralized database for validation of international • mobile equipment identity (IMEI) • EIR contains 3 lists: • White list (for valid MS equipment) • Black list (for stolen or denied service MS) • Gray list (for mal-performance MS [e.g. faulty software] ) EIR Black list White list Gray list

  33. GSMNETWORK ARCHITECTURE 3-The Operation and maintenance center (OMC):- A-The Operation and Maintenance Center for Radio part (BSS) (OMC-R) B-The Operation and Maintenance Center for switching parts (OMC-S)

  34. GSMNETWORK ARCHITECTURE The Operation and maintenance center (OMC)

  35. GSMNETWORK ARCHITECTURE - Geographic network areas

  36. GSMNETWORK ARCHITECTURE

  37. GSMNETWORK ARCHITECTURE

  38. GSMNETWORK ARCHITECTURE

  39. IDENTITY NUMBERS

  40. IDENTITY NUMBERS

  41. GSMNETWORK ARCHITECTURE - Cell

  42. IDENTITY NUMBERS

  43. IDENTITY NUMBERS

  44. The base station controller (BSC)

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