Gsm vs gprs

Basic Concepts of Gsm vs gprs

1. PRESENTED BY: GAURAV BISWAS BIT MESRA OVERVIEW OF MOBILE COMMUNICATION GSM VS GPRS

2. CONTENT 10/4/2019 INTRODUCTION OF GSM GSM ARCHITECTURE INTRODUCTION OF GPRS GPRS ARCHITECTURE DIFFERENCE B/W GSM AND GPRS CHANNEL IN GPRS 2

3. INTRODUCTION OF GSM 10/4/2019 GSM(Global system of mobile communications),was developed in year 1992(Europe) It makes efficient use of Spectrum Easy installation Low cost of infrastructure Enhance security features GSM offers voice and low data rate services 3

4. GSM ARCHITECTURE 10/4/2019 4 SIM ME MSS SIM ME MSS BTS BTS BSC OSS OMC NMC NSS EIR MSC HLR VLR AuC MSC VLR PSTN ISDN Other n/w Fig. Reference:wireless communication book –Sanjay Kumar

5. GSM subsystem 10/4/2019 5 GSM supports hierarchical architecture MSS(Mobile station subsystem) BSS(base station subsystem) NSS(Network and switching sub sytem ) OSS(operating subsystem)

6. INTRODUCTION OF GPRS 10/4/2019 GPRS ( General Packet Radio Services) is packet oriented mobile data service Step between 2G and 3G cellular system More efficient use of network resources (data actually transmitted) It facilitates ‘always ON’ connection It is well suited for multi user scenario 6

7. GPRS ARCHITECTURE 10/4/2019 7 MSS SIM ME MSS SIM ME BSS BTS BSC MSC/VLR SGSN HLR/GR SMS-GMSC SMS-IWMSC SM-SC GGSN Other n/w SGSN Other n/w GGSN EIR Fig reference:wireless communication book –Sanjay kumar

8. DIFFERENCE B/W GSM AND GPRS 10/4/2019 PARAMETERS GSM GPRS Transmission Circuit Switch Packet Switch Max.Trans.Rate 14.4 kbps 114kbps(data) Resources less efficient use more efficient use Access Time Long Short Charging duration based volume based ‘always on’ System generation 2G 2.5G Features SMS MMS 8

9. LOGICAL CHANNELS IN GPRS 10/4/2019 Channels Group sub channels Direction PBCCH PBCCH(packet broadcast BS->MS broadcast control channel) Packet PCCCH PPCH(packet paging channel) BS->MS Data PRACH(packet random access) BS<-MS Channel PNCH(notification channel) BS->MS packet traffic ch. PDTCH( pcket data transfer ch) BS<->MS 9

10. Function Of GPRS 10/4/2019 Broadcast channels: Packet Broadcast Central Channel (PBCCH)-B roadcasts information - power control parameters, access methods and operational modes, network parameters, required to set up calls. Common control channels: Packet Paging Channel (PPCH)- used for control signalling prior to the call set up Packet Access Grant Channel (PAGCH)- telling the mobile which traffic channel has been assigned Packet Notification Channel (PNCH- used to alert mobiles that there is broadcast traffic intended for a large number 10

11. Function Of GPRS 10/4/2019 Dedicated control channels: Packet Associated Control Channel (PACCH):  Used for control signalling while a call is in progress Packet Timing Advance Common Control Channel (PTCCH): u sed to adjust the timing advance, messages arrive at the correct time at the base station Dedicated traffic channel: Packet Data Traffic Channel (PDTCH): used to send the traffic and it is present in both the uplink and downlink directions, provide high speed data.   11

12. Reference 10/4/2019 12 Wireless communication by Dr. Sanjay Kumar Internet

13. 10/4/2019 THANK YOU! 13