AIR INTERFACE

UPLINK 890 - 915 MHz

DOWNLINK 935 - 960 MHz

MOBILE

BASE TRANSCEIVER STATION

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Text 24 ptBullets level 2-520 ptGSM System2010-01-07

GSM uses paired radio channels01240124890MHz915MHz935MHz960MHzUPLINKDOWNLINK

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Text 24 ptBullets level 2-520 ptGSM System2010-01-07

GSM combines FDM and TDM: bandwidth is subdivided into channels of 200khz, shared by up to eight stations, assigning slots for transmission on demand.

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LOGICAL CHANNELSTRAFFICSIGNALLINGFULL RATEBm 22.8 Kb/SHALF RATELm 11.4 Kb/SBROADCASTCOMMON CONTROL DEDICATED CONTROLFCCHSCHBCCHPCHRACHAGCHSDCCHSACCHFACCHFCCH -- FREQUENCY CORRECTION CHANNELSCH -- SYNCHRONISATION CHANNELBCCH -- BROADCAST CONTROL CHANNELPCH -- PAGING CHANNELRACH -- RANDOM ACCESS CHANNELAGCH -- ACCESS GRANTED CHANNELSDCCH -- STAND ALONE DEDICATED CONTROL CHANNELSACCH -- SLOW ASSOCIATED CONTROL CHANNELFACCH -- FAST ASSOCIATED CONTROL CHANNELDOWN LINK ONLYUPLINK ONLYBOTH UP & DOWNLINKS

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Text 24 ptBullets level 2-520 ptGSM System2010-01-07

GSM - TDMA/FDMA935-960 MHz124 channels (200 kHz)downlink890-915 MHz124 channels (200 kHz)uplinkfrequencytimeGSM TDMA frameGSM time-slot (normal burst)guardspaceguardspace

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Slide subtitle 24 pt

Text 24 ptBullets level 2-520 ptGSM System2010-01-07

GSM System 270.833 kb/s per carrierGMSK with a time bandwidth product BT =0.3Slow frequency hoping 217/hops/second.Synchronization compensation for up to 233micro seconds absolute delayBlock and convolutional channel coding copuled with interleaving to combat channel perturbations- overall channel rate of 22.8 kb/sFull rate channel 13 kb/s voice coder rate using regular pulse excitation/linear predictive coding RPE/LPC, half rate channel 6.5 kb/s usingVector coder rate using vector sum excited linear predictivie coding VSELPOverall full rate channel bit rate of 22.8 kb/s.Each cell can have from 1 to 16 pairs of carriers. GSM System GSM System GSM System GSM System