Intro To Gsm Wh080917

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A brief introduction GSM system

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  • Intro To Gsm Wh080917

    1. 1. Introduction to GSM system Introduction to GSM system Wade Hwang
    2. 2. Introduction to GSM system Outline Migration of GSM system History of public wireless communication History of GSM system Working principle of GSM system Concept of GSM system Main components Network structure Important interfaces Features of GSM system Introduction to GSM system, 05/23/09 2 Wade Hwang
    3. 3. Introduction to GSM system History of public wireless communication 3G 2.75G Multimedia Intermediate 2.5G Multimedia 2G Packet Data 1G Digital Voice Analog Voice GPRS W-CDMA GSM EDGE (UMTS) 115 Kbps NMT 9.6 Kbps 384 Kbps Up to 2 Mbps GSM/ TD-SCDMA TDMA GPRS (Overlay) TACS 2 Mbps? 115 Kbps 9.6 Kbps iDEN iDEN 9.6 Kbps PDC (Overlay) 9.6 Kbps AMPS CDMA 1xRTT cdma2000 CDMA 1X-EV-DV 14.4 Kbps PHS (IP-Based) 144 Kbps Over 2.4 Mbps / 64 Kbps 64 Kbps PHS 2003 - 2004+ 2003+ 2001+ 1992 - 2000+ Source: U.S. Bancorp Piper Jaffray 1984 - 1996+ Introduction to GSM system, 05/23/09 3 Wade Hwang
    4. 4. Introduction to GSM system History of public wireless communication 3000 Subscribers 3000 (Millions) 2500 Global mobile-phone subscribers hit 2B (Oct 05) 2000 1500 1000 1000 400 500 1997 2000 2003 2005 2007 UMTS 100 Million Introduction to GSM system, 05/23/09 4 Wade Hwang
    5. 5. Introduction to GSM system History of GSM system Completion of Trials of different digital first set of radio transmission detailed GSM first GSM 02 95% of 06 GSM schemes and different specifications First call made nations SURPASSES speech codecs in for commercial by worldwide TWO several countries, with infrastructure GPRS Radiolinja have GSM BILLION comparative evaluation tendering services in Finland. networks. CUSTOMERS. by CEPT GSM in Paris. purposes. launched. 1982 1984 1985 1986 1987 1988 1989 1991 1992 1993 1994 2000 2001 2002 2003 2004 2006 2007 2008 Group Special Basic Group Special 92 First GSM 03 First Mobile (GSM) is parameters of Mobile defines international surpasses 3 EDGE formed by the the GSM the GSM roaming Billion networks Confederation of standard standard as the agreement connections go live. European Posts and agreed in internationally signed between Telecommunications February. accepted digital Telecom (CEPT) to design a TDMA, RPE— cellular Finland and pan-European LTP, GMSK telephony Vodafone (UK). mobile technology. standard. First SMS sent. Introduction to GSM system, 05/23/09 5 Wade Hwang
    6. 6. Introduction to GSM system Outline Migration of GSM system History of public wireless communication History of GSM system Working principle of GSM system Concept of GSM system Main components Network structure Important interfaces Features of GSM system Introduction to GSM system, 05/23/09 6 Wade Hwang
    7. 7. Introduction to GSM system Concept of GSM system GSM operation section (worldwide) PLMN operation section (one or more in a country) MSC operation section (one district controlled by a MSC) LAI (Locating & paging district) Cell (a specific area covered by a BTS) Introduction to GSM system, 05/23/09 7 Wade Hwang
    8. 8. Introduction to GSM system Concept of GSM system GSM operation section Worldwide wireless communication network. PLMN (Public Land Mobile Network) A public land mobile network (PLMN) is a network that is established and operated by an administration or by a recognized operating agency (ROA) for the specific purpose of providing land mobile telecommunications services to the public. For example, in china, MNC (Mobile Network Code) of China Mobile’s GSM network is ‘00’, while China Unicom’s is ‘01’. MSC operation section One district controlled by a MSC LAI (Location Area Identity) Each location area of a public land mobile network (PLMN) has its own unique identifier which is known as Location Area Identity (LAI). CELL A specific area covered by a BTS Introduction to GSM system, 05/23/09 8 Wade Hwang
    9. 9. Introduction to GSM system Main components  NSS (Network Switching Subsystem) It carries out switching functions and manages the communications between mobile phones and the Public Switched Telephone Network.  BSS (Base Station Subsystem) Responsible for handling traffic and signaling between a mobile phone and the network switching subsystem.  OMC (Operations and Maintenance Center) The functional entity from which the network operator monitors and controls the system.  MS (Mobile Station) MS refers to the Mobile Phone. i.e. the handset held by the users in the mobile network. Introduction to GSM system, 05/23/09 9 Wade Hwang
    10. 10. Introduction to GSM system Network structure and main interfaces Introduction to GSM system, 05/23/09 10 Wade Hwang
    11. 11. Introduction to GSM system Important interfaces Um - The air interface between the MS (Mobile Station) and the BTS. Call control, measurement reporting, Handover, Power control, Authentication, Authorization, Location Update and so on. Abis - The interface between the BTS and BSC. BTS supervision and telecom signaling, and carries synchronization from the BSC to the BTS and MS. A - The interface between the BSC and Mobile Switching Center. Carrying Traffic channels Ater - The interface between the BSC and Transcoder. Gb - Connects the BSS to the Serving GPRS Support Node (SGSN) in the GPRS Core Network. Introduction to GSM system, 05/23/09 11 Wade Hwang
    12. 12. Introduction to GSM system Outline Migration of GSM system History of public wireless communication History of GSM system Working principle of GSM system Concept of GSM system Main components Network structure Important interfaces Features of GSM system Introduction to GSM system, 05/23/09 12 Wade Hwang
    13. 13. Introduction to GSM system Features of GSM system  Spectrum efficiency Improved spectrum efficiency due to new technologies utilized such as efficient modulator and demodulator, channel coding, Interleaving, equalization and Vocoder  System capacity 3-5 times higher than TACS due to TDMA, half-speed Vocoder and other technologies adopted.  Voice quality Same voice quality in the coverage where the signal strength is higher than threshold.  Open interfaces Not only open air interface but also open interfaces between system components, enables flexibility.  Security Authentication, encryption and TMSI (temporary mobile subscriber identity).  Roaming SIM (subscriber identity module) and IMSI. Introduction to GSM system, 05/23/09 13 Wade Hwang
    14. 14. Introduction to GSM system Q&A Thank you Introduction to GSM system, 05/23/09 14 Wade Hwang

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