Post on 04-Jun-2018
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
1/19
General Packet Radio Service
Module 3
BY:- GAURAV KUMAR
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
2/19
Chapter
Topics to be covered in this session :-
Need Of GPRSGPRS Architecture
Session Objective
BY:- GAURAV KUMAR
GPRS Terminals
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
3/19
GPRS
GPRS is a new bearer service for GSM
Packet Data Network (PDN) to the Internet.
BY:- GAURAV KUMAR
Short comings of existing cellular data services :Data rates are too slowConnection setup takes too long and complicatedService is too expensive for most users.
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
4/19
GPRS Benefit
GPRS improves the utilization of the radio resources Offers volume-based billing Higher data transfer rates (Data Rate 14.4 115
kbps)
BY:- GAURAV KUMAR
or er access mes Simplifies the access to packet data networks New Data Services High Speed Efficient use of radio bandwidth Circuit switching & Packet Switching can be
used in parallel Constant connectivity
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
5/19
GSM vs GPRS
GSM GPRS
Data Rate 9.6 Kbps 14.4 to 115.2 Kbps
Modulation Techniques GMSK GMSK
BY:- GAURAV KUMAR
Billing Duration ofconnection
Amount of datatransferred
Type of Connection CS technology PS
technology
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
6/19
BSS
Same Radiofor Packetand Circuit
TrafficCircuit
Packets
BSC
GPRS System ArchitectureGPRS System Architecture
BY:- GAURAV KUMAR
GPRSPLMN
GSM PLMN
HLR
MSC/VLR
MSC
SGSN
SGSN
GGSN
SS7GGSN
X.25
IP
Intra
PLMN IPBackbone
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
7/19
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
8/19
GPRS Network Elements
SGSN
Node serving multiple MS and BSS Establishes mobility management context Interfaces with HLR to perform security functions and
access control
BY:- GAURAV KUMAR
GPRS PLMNBSS
BSS
SGSNBSS GGSN
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
9/19
GPRS Network Elements
GGSN
Gateway to the IP Packet Data Network Stores SGSN routing info for each GPRS user Stores specific information on IP addresses One PLMN may contain multiple GGSNs
BY:- GAURAV KUMAR
GPRS PLMN
IP
PDN
BSS
BSS
SGSN
SGSN
GGSN
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
10/19
GPRS Terminals
Class A
MS supports simultaneous operation of GPRS andGSM services
BY:- GAURAV KUMAR
MS able to register with the n/w for both GPRS &
GSM services simultaneously. It can only use oneof the two services at a given time.
Class C - MS can attach for either GPRS or GSM services
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
11/19
Ex : 1) Class 10 is also known as 4+2, means 4 slots to download
and 2 slots to upload, but no more than 5 slots used at a time.
For applications where data is sent back-and-forth in roughlyequal amount, such as instant messaging.
GPRS Speed & Profiles
BY:- GAURAV KUMAR
2) Class 8 is also known as 4+1, means 4 slots to downloadand 1 slot to upload
For applications where data is mostly downloaded,such as web browsing.
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
12/19
GSM Location Area(LA) is divided into several Routing Areas(RA)
RA consists of several cells SGSN is informed when MS moves to a new RA MS sends a Routing Area Update Request to its assigned SGSN
Routing Area Update
BY:- GAURAV KUMAR
Types of Routing Area Update
Intra SGSN Routing Area Update
Inter SGSN Routing Area Update
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
13/19
Protocol Architecture
BY:- GAURAV KUMAR
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
14/19
Controls access attempts of an MS on radio channels shared byseveral MSs
Employs algos. for contention resolution, multiuser
Protocol Architecture
Medium Access Control
BY:- GAURAV KUMAR
Both ack and unack. Modes of operation are supported inRLC/MAC layer
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
15/19
Establishes highly reliable logical link between MS & its assigned SGSN Works either in acknowledged or unacknowledged modes Data confidentiality is ensured by ciphering functions
Protocol Architecture
Medium Access Control
BY:- GAURAV KUMAR
Establish a reliable link between MS & BSSSegmentation and reassembly of LLC frames into RLC data blocks
Radio Link Control
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
16/19
Used to transfer data packets between SGSN and MS Multiplexing of several connections of network layer onto one logical
connection of underlying LLC layer
Protocol Architecture
Sub Network Dependent Convergence Protocol
BY:- GAURAV KUMAR
Compression and decompression of user data and header informationData Link layer
Divided into two sub layers : LLC layer (between MS-SGSN) RLC/MAC (between MS-BSS)
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
17/19
Delivers routing & Quality of Service related information between BSSand SGSN
BSS GPRS-Tunneling Protocol
Protocol Architecture
BY:- GAURAV KUMAR
GTP tunnels user data packets and related signalinginformation between GSNs
Signaling is used to create, modify and delete tunnels
Defined both at Gn and Gp interface Below GTP, TCP or UDP are employed to transport the GTPPackets within backbone network
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
18/19
REVIEW
In this session we discussed about the:-
Need Of GPRSGPRS ArchitectureGPRS Terminals
BY:- GAURAV KUMAR
GPRS Protocols
8/14/2019 Chap 26 General Packet Radio Service [Compatibility Mode]
19/19
Presented By:- Gaurav Kumar
BY:- GAURAV KUMAR