Gsm Architecture
GSM 1
Mobile Communications GSM
Manuel P. Ricardo
Faculdade de Engenharia da Universidade do Porto
GSM 2
Acknowledgements
♦
These slides are based on the slides developed by
» Prof. Jochen Schiller
– Slides from the book “Mobile Communication: Wireless Telecommunication Systems” – http://www.jochenschiller.de
» Prof. Mário Jorge Leitão
– http://www.fe.up.pt/~mleitao/
GSM 3
♦ ♦ ♦ ♦ ♦ ♦ ♦
What are the main network elements of GSM? What are the GSM addresses? How is the data transmitted over the air interface? What are the main logical channels? What is the GSM protocol stack for signalling? How is a Mobile Terminated Call processed? How is a Mobile Initiated Call processed?
GSM 4
GSM - Overview
♦ ♦ ♦
Formerly: Groupe Spéciale Mobile (founded 1982) Now: Global System for Mobile Communication Pan-European standard
» ETSI, European Telecommunications Standardisation Institute
♦ ♦
Seamless roaming within Europe possible Many providers all over the world
GSM 5
Services
♦
Basic services
» voice services, data services, short message service
♦
Additional services
» emergency number, group 3 fax
♦
Supplementary services
» identification: forwarding of caller number » suppression of number forwarding » automatic call-back
GSM 6
Basic Services
♦
Voice services (speech coding with protection)
» full rate: 13 / 12.2 kbit/s (original coder / enhanced full rate coder) » half rate: 5.6 kbit/s (enhanced half rate coder)
♦
Data services (coding with different levels of protection)
» full rate: 9.6 / 4.8 / 2.4 kbit/s » half rate: 4.8 / 2.4 kbit/s
♦
Enhanced data services
GPRS (General Packet Radio Service)
» various rates (typically up to 53.6 kbit/s)
Public Land Mobile Network (PLMN) radio cell MS MS BSS radio cell RSS BTS MS
GSM 7
BTS
BSC
BSC
NSS MSC MSC signaling GMSC IWF ISDN, PSTN PDN
VLR HLR OSS
VLR
EIR
AuC
OMC
GSM Architecture – Radio
Mobile Communications GSM
Manuel P. Ricardo
Faculdade de Engenharia da Universidade do Porto
GSM 2
Acknowledgements
♦
These slides are based on the slides developed by
» Prof. Jochen Schiller
– Slides from the book “Mobile Communication: Wireless Telecommunication Systems” – http://www.jochenschiller.de
» Prof. Mário Jorge Leitão
– http://www.fe.up.pt/~mleitao/
GSM 3
♦ ♦ ♦ ♦ ♦ ♦ ♦
What are the main network elements of GSM? What are the GSM addresses? How is the data transmitted over the air interface? What are the main logical channels? What is the GSM protocol stack for signalling? How is a Mobile Terminated Call processed? How is a Mobile Initiated Call processed?
GSM 4
GSM - Overview
♦ ♦ ♦
Formerly: Groupe Spéciale Mobile (founded 1982) Now: Global System for Mobile Communication Pan-European standard
» ETSI, European Telecommunications Standardisation Institute
♦ ♦
Seamless roaming within Europe possible Many providers all over the world
GSM 5
Services
♦
Basic services
» voice services, data services, short message service
♦
Additional services
» emergency number, group 3 fax
♦
Supplementary services
» identification: forwarding of caller number » suppression of number forwarding » automatic call-back
GSM 6
Basic Services
♦
Voice services (speech coding with protection)
» full rate: 13 / 12.2 kbit/s (original coder / enhanced full rate coder) » half rate: 5.6 kbit/s (enhanced half rate coder)
♦
Data services (coding with different levels of protection)
» full rate: 9.6 / 4.8 / 2.4 kbit/s » half rate: 4.8 / 2.4 kbit/s
♦
Enhanced data services
GPRS (General Packet Radio Service)
» various rates (typically up to 53.6 kbit/s)
Public Land Mobile Network (PLMN) radio cell MS MS BSS radio cell RSS BTS MS
GSM 7
BTS
BSC
BSC
NSS MSC MSC signaling GMSC IWF ISDN, PSTN PDN
VLR HLR OSS
VLR
EIR
AuC
OMC
GSM Architecture – Radio