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Gprs architecture
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- 2. GPRS ( GeneralPacket Radio Services ) ● General Packet Radio Services (GPRS) is a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for mobile phone and computer users. ● The higher data rates allow users to take part in video conferences and interact with multimedia Web sites and similar applications using mobile handheld devices as well as notebook computers. ● GPRS is based on Global System for Mobile (GSM) communication and complements existing services such as circuit-switched cellular phone connections and the Short Message Service (SMS).
- 3. DATABASES05 All the databasesin the network will require software upgrades to handle the new call models and functions introduced by GPRS. GPRS SUPPORT NODES04 The deployment of GPRS requires the installation of serving GPRS support node SGSN and gateway GPRS support node. BASE STATION CONTROLLER03 The Base Station Controller BSC requires a software upgrade and the installation of new hardware called the packet control unit PCU. BASE TRANSCEIVER STATION02 A software upgrade is required in the existing Base Transceiver Station. MOBILE STATION01 New Mobile Station is required to access GPRS services. These new terminals will be backward compatible with GSM for voice calls. GPRS MODIFICATIONS
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- 6. MAIN ELEMENTS GPRS SUPPORT NODES GatewayGPRS Support Node GGSN Serving GPRS Support Node SGSN GPRS MOBILE STATIONS Mobile Station is required to access GPRS services When either voice or data traffic is originated at the subscriber mobile, it is transported over the air interface to the BTS GPRS BASE STATION SUBSYSTEMS ROUTINGAERA Routing area is similar to Location Area in GSM,except that it generally contains fewer cells INTERNAL BACKBONE The internal backbone is an IP based network used to carry packets between different GSNs
- 7. GPRS SUPPORT NODES Serving GPRS Support Node(SGSN) Gateway GPRS Support Node (CGSN) GPRS SUPPORT NODES
- 8. SGSN( Serving GPRSSupport Node ) ● Routing the packet switched data to and from the mobile station. ● Mobility management. ● Data management. ● Authentication and charging for cells. ● Stores the location information of the user.
- 9. GGSN ( GatewaySPRS Support Node ) ● Provides a gateway between GPRS and PDN (Packet Data Networks). ● Converts data from SGSN to PDP format (Packet Data Protocol). ● Stores the current SGSN address. ● Stores the location of user in it’s location register. ● Performs authentication and charging functions.
- 10. GPRS SUBSYSTEMS 01 02 03 04 BASE STATIONSYSTEM (BSS) NETWORK SUB-SYSTEM (NSS) GATEWAY SUB-SYSTEM (GSS) RADIO STATION SUB- SYSTEM (RSS)
- 11. BASE STATION SYSTEM(BSS) ● BSS needs enhancement to recognize and send packet data ● BSS includes BTS (Base Transceiver Station) and MS (Mobile Station) ● It consists of a number of SGSN (Serving GPRS Support Node) ● Also consists of a number of MSC (Mobile-Service Switching Center) ● Helps in authentication, operation and maintenance of subsystems NETWORK SUB-SYSTEM (NSS)
- 12. RADIO STATION SUB-SYSTEM(RSS) ● Consists of a number of MS (Mobile Station), BTS (Base Transceiver Station) and BSC (Base Station Controller) ● Stores a CKSN (Cipher Key Sequence Number - a logical identity) ● Consists of SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node) ● Provides connections to other networks and PDA (Public Data Network) GATEWAY SUB-SYSTEM (GSS)
- 13. GPRS PERFORMANCE CATEGORIES Theyare split into three basic categories according to their capabilities in terms of the ability to connect to GSM and GPRS facilities: ● Class A: - This class describes mobile phones that can be connected to both GPRS and GSM services at the same time. ● Class B: - These mobiles can be attached to both GPRS and GSM services but they can be used on only one service at a time. A Class B mobile can make or receive a voice call, or send and or receive a SMS message during a GPRS connection. During voice calls or texting the GPRS service is suspended but it is re-established when the voice call or SMS session is complete. ● Class C: - This classification covers phones that can be attached to either GPRS or GSM services but user needs to switch manually between the two different types.
- 14. CONCLUSION ● GPRS providesefficient access to Packet Data Networks ● Multislot operation in GPRS leads to efficient channel utilization ● GPRS is more effective for long data packet transmission than short ones.
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