4. Comparison of GSM & GPRS Amount of data transferred Duration of connection Billing Packet - Switched Technology Circuit – Switched Technology Type of Connection GMSK GMSK Modulation Technique 14.4 to 115.2 Kbps 9.6 Kbps Data Rates GPRS GSM
16. GPRS SYSTEM ARCHITECTURE BSC SGSN MS BTS BTS Other GPRS PLMN GGSN PDN Gb Gd Gp Gn Gf Gs Gc GGSN EIR HLR+GPRS Register MSC/VLR D SMS-GMSC SMS-INMSC Gi Gr
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22. GPRS BACKBONE NETWORK inter-PLMN GPRS backbone External Packet Data Network (PDN) intra-PLMN GPRS backbone intra-PLMN GPRS backbone PLMN1 PLMN2 SGSN SGSN SGSN GGSN GGSN Border gateway Border gateway Gp Gn Gi Gn Gn BTS BTS BSC BSC Host Router LAN MS Gi Gn Gn Gp
23. Protocol Stack GSM RF SNDCP IP / X.25 Application Um Gn Gb MAC RLC LLC IP / X.25 GTP L1 L2 LLC GSM RF Frame Relay MAC RLC BSSGP L1bis BSSGP Frame Relay LLC SNDCP GTP L1bis L1 L2 IP MS BSS (PCU) SGSN GGSN Gi IP UDP/ TCP UDP/ TCP
34. DATA CALL ROUTING inter-PLMN GPRS backbone External Packet data network(PDN) Intra-PLMN GPRS backbone intra-PLMN GPRS backbone PLMN1 PLMN2 SGSN SGSN SGSN GGSN GGSN Border gateway Border gateway Gp Gn Gi Gn Gn BTS BTS BSC BSC Host Router LAN MS
49. Multiframe Structure of PDCH Four consecutive TDMA frame forms one block - B0 – B11 Two TDMA frames for transmission of PTCCH - T Two Idle frames - X
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