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1、GSM,吴伟民 电子与信息工程系 ,1,+,+,+,2,CONTENTS,+ History + GSM Network Architecture 1- BTS Description 2- BSC Description 3- MSC Description 4- VLR Description 5- HLR Description 6- MS Description + Area Configuration + Frequency description + TDMA Frame,Mobile in IDLE Mode 1-FCCH Channel 2- SCH Channel 3- BC
2、CH Channel 3- Roaming Notion How to call a mobile? 1- PCH Channel Mobile in communication 1- RACH Channel 2- AGCH Channel 3- Maximal Configuration for Common channels 4- Minimal Configuration for Common channels,+,+,Mobile in communication,5- SDCCH Channel 6- SACCH Channel,7- Multiplexing Channel: S
3、DCCH - SACCH 8- FACCH/TCH Channel,9- Multiplexing Channel: FACCH/TCH - SACCH 10- Communication example,11- Voice Codec,Subscriber Confidentiality,1- Subscriber Identity,2- Subscriber Authentication 3- Ciphering Mode,3,CONTENTS,+,+,+,GSM Services,+,Layer 3,1- Supplementary Services,2 - SMS GSM Protoc
4、ol,1 RR Layer 2 MM Layer 3 CM Layer,1 Global Architecture Radio Interface - LAPDm 4,CONTENTS,+,Abis Interface 1 Physical Layer 2 - LAPD 3- Layer 3 -RSL,+,A - Interface 1 MTP 2 2 MTP 3 3 SSCP 4 BSSAP,5,CONTENTS,1987,1989,1990,1992,1994,HISTORY,1982 1994,Group Special Mobile is born Technical Radio Tr
5、ansmission is selected, prototype is done in 1986 GSM Members have created Technical Comity Technique (TC) of ETSI. First Technical Standard Draft were written. GSM 900: Stage 1 of GSM Specification was done. Adaptation of DCS 1800 was started. First European Network using GSM 900 was opened Stage 2
6、 of GSM900 AND DCS1800 was done including half-rate. Several evolutions : Stage 2+,6,GSM NETWORK ARCHITECTURE,3 Sub-Networks :,Radio Sub-System (BSS Base Station Sub-System),Wire Network Sub-System (NSS Network Sub-System),Operation and Maintenance Sub -System,(OSS, Operation Sub-System, not explain
7、ed in this course),7,4,GSM NETWORK ARCHITECTURE,BSS,NSS B,VLR,D,HLR,BTS,Abis,BSC,A,D,MSC,E,P,Abis,B VLR,S,Abis,BSC,A,T N,MSC 4,MS,8,BTS DESCRIPTION,Base Transceiver Station,Include Receivers and Transmiters : TRX.,Radio Transmission : modulation, demodulation, eqalization,Code Corrector, Encryption.
8、,Acces to physical TDMA Frame (Time Division Multiple Access).,Power Measurements and Quality Measurements, not used by BTS,9,BTS DESCRIPTION Configuration in STAR BTS,Abis,BSC,A,BTS BTS,Abis Abis,10,BTS DESCRIPTION Configuration in Chain,BTS,BTS,BTS,Abis,BSC,A,11,BSC DESCRIPTION,Base Station Contro
9、ller,Intelligent Entity of BSS.,Manage radio resources on each TRX.,Allocation of physical channels.,Tx Power Control for MS and BTS on each communication (in theory).,HandOver Procedures : when mobile switches cell during,communication.,12,MSC DESCRIPTION,Mobile-service Switching Center,Management
10、communications between MS and different MSCs.,GMSC : GateWay MSC.,Direct link with external networks,PSTN (Public Switched Telephone Network). ISDN (Integrated Services Digital Network),MSC protocol uses between entities.,13,VLR DESCRIPTION,Visitor Location Register,Database including subscriber inf
11、ormation relevant to area location.,VLR could be involved with MSC (same computer).,Subscriber Information: Ciphering Keys, Temporary Identity, Supplementary Services (roaming international, Call Fowarding ).,14,HLR DESCRIPTION,Home Location Register,Register Database for all subscribers defined by
12、PLMN (CU and CMCC).,International Mobile Subscriber Identity: IMSI.,Subscriber Call Number (MSISDN : 06 62 H1H2 XX XX).,Supplementary Services of (roaming services,call forwarding, second call .).,VLR number where subscriber is stored.,Authentication Center (AUC) includes,15,MS DESCRIPTION Mobile St
13、ation Terminal Equipment including SIM card. Access to PLMN Services. Manage Uplink Physical Layer (TDMA Frame) Terminal Equipment has unique IMEI number,Mobile Class : from 1 to 5,0.8W to 20W,16,AREA CONFIGURATION,Cell Information,Includes 4 to 10 TRX (frequencies).,Cell Paremeters:,Country Number
14、(MCC) PLMN Number (MNC) Cell Number (Cell Id) Cell Color (BSIC),Main Frequency (main cell) Secondary frequencies Access Control for MS,Neighbour Cells LAC Number,Dimension : from 100m to 30 km.,17,AREA CONFIGURATION,LAC Definition (Location Area Code),Group of cells involves in a PLMN.,Cellular Engi
15、neering : 1 MSC for one LAC.,MS monitors in continue if it is changing of LAC.,LAC number is stored in registering subscriber s VLR entity LAI:MCC+MNC+LAC,18,AREA CONFIGURATION,LAC 75021,F12,F5,F6,F3,F8,F11,F20,F4,F7,F22,F2,F1,F10,F30,F15,F6,F8,F3,LAC 75020,F1,F5,F9,Main Frequency 19,AREA CONFIGURAT
16、ION,BSIC number is used for descriminating 2 cells using same Main Frequency.,Usually, same BSIC number is set in area group of cells.,BSIC number is not in relation with LAC number,20,FREQUENCY BANDS GSM 900, Primary Band Extended Band,890 915 MHz in Uplink 935 960 MHz in Downlink 880 890 MHz in Uplink,925 935 MHz in Downlink DCS 1800 1710 1785 MHz in Uplink 1805 1880 MHz in Downlink PCS 1900 1850 1910 MHz in Uplink
