Raj K. Bansal, Rajeev Bansal Organic Chemistry Problems and Solutions 2009
General Packet Radio Service An Overview Ashish Bansal.
-
Upload
destin-linch -
Category
Documents
-
view
213 -
download
0
Transcript of General Packet Radio Service An Overview Ashish Bansal.
General Concepts
• Packet mode technique for xmitting high speed and low speed data and signaling
• New GPRS radio channels with flexible allocation
• Four different QoS levels are defined• MS can operate in 3 different modes of
operation• Two new nodes - SGSN and GGSN
GPRS Layers contd...• GPRS Tunneling Protocol (GTP): for tunneling data and signaling between
GSNs in the network.• GPRS Mobility Management and Session Management (GMM/SM): for GPRS
attach, GPRS detach, security, routeing area update, location update, PDP context activation and deactivation
• Subnetwork Dependent Convergence Protocol (SNDCP): Maps different packet data protocols (like IP, X.25) to a common level.
• Logical Link Control (LLC): provides highly reliable ciphered logical link.• Relay: Exists on BSS and SGSN. Responsible for mapping LLC PDUs
between Um and Gb interfaces. In SGSN maps between Gb and Gn interfaces.• Base Station System GPRS Protocol (BSSGP): For conveying routing and QoS
related information between BSS and SGSN.• Network Service (NS): For transporting BSSGP PDUs. Based on frame relay.• Radio Link Control/Medium Access Control (RLC/MAC): RLC provides radio-
solution dependant reliable link. MAC controls request and grant procedures for the radio channel and mapping of LLC frames onto GSM channels..
GPRS Operation
• GPRS Attach
• PDP Context Activation
• Data transfer
• PDP Context Deactivation/GPRS Detach
References
• C Bettstetter, H Vogel, J Eberspacher, “GSM Phase 2+ General Packet Radio Service GPRS: Architecture, Protocols, and Air Interface”, IEEE Communications Survey, vol. 2 no. 3, pp 2-14, IIIrd quarter 1999.
• GSM 03.60 - GPRS Service Description
• GSM 08.18 - BSS GPRS Protocol
• GSM 04.07 - Mobile radio interface Layer 3: General Aspects
• See http://www.etsi.org