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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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Presentation Transcript
slide1

CH 2

GSMNETWORK ARCHITECTURE

slide2

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
slide3

GSMNETWORK ARCHITECTURE

  • GSM NETWORK ARCHITECTURE
slide7

GSMNETWORK ARCHITECTURE

-The Mobile station(MS)

Monitoring power & quality of its BTS

slide8

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)
slide10

GSMNETWORK ARCHITECTURE

2- Subscriber identity module (SIM)

An electronic microchip for storing information

slide17

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
different elements of rbs or bts1
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

slide22

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
slide23

GSMNETWORK ARCHITECTURE

  • The base station controller (BSC)

Remote BTS

BTS

BTS

BSC

Co-located BTS

slide24

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

slide26

GSMNETWORK ARCHITECTURE

BSS Link configuration

- Cascade

BTS

BSC

BTS

BTS

BTS

BTS

slide27

GSMNETWORK ARCHITECTURE

BSS Link configuration

- loop

BTS

BSC

BTS

BTS

BTS

slide28

GSMNETWORK ARCHITECTURE

BSS Link configuration

- Star

BTS

BTS

BTS

BTS

BTS

BSC

slide29

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
slide31

GSMNETWORK ARCHITECTURE

  • The MSC is connected to:
    • HLR (Home location register)
    • VLR (Visitor location register)
    • AUC (Authentication register)
    • EIR (Equipment identity register)
slide32

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
slide33

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)
slide34

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

slide35

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

slide36

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)

slide37

GSMNETWORK ARCHITECTURE

The Operation and maintenance center (OMC)

slide38

GSMNETWORK ARCHITECTURE

- Geographic network areas