Chap 26 General Packet Radio Service
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Transcript of Chap 26 General Packet Radio Service
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8/14/2019 Chap 26 General Packet Radio Service
1/22
By:- Gaurav Kumar
ZEPHYR SYSTEM PVT. LTD
We hink and operate globally
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8/14/2019 Chap 26 General Packet Radio Service
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By:- Gaurav Kumar
General Packet Radio Service
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Topics to be covered in this session :-
Need Of GPRSGPRS Architecture
GPRS Terminals
GPRS Protocol
Session Objective
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GPRS
GPRS is a new bearer service for GSM
Packet Data Network (PDN) to the Internet.
Short comings of existing cellular data services :Data rates are too slow
Connection setup takes too long and complicatedService is too expensive for most users.
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GPRS Benefit
GPRS improves the utilization of the radio resources
Offers volume-based billing
Higher data transfer rates (Data Rate 14.4 115 kbps)
Shorter access times
Simplifies the access to packet data networks
New Data Services
High Speed Efficient use of radio bandwidth
Circuit switching & Packet Switching can beused in parallel
Constant connectivity
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GSM vs GPRS
GSM GPRS
Data Rate 9.6 Kbps 14.4 to 115.2 Kbps
Modulation Techniques GMSK GMSK
Billing Duration ofconnection
Amount of data
transferred
Type of Connection CS technology PS
technology
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8/14/2019 Chap 26 General Packet Radio Service
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Topics to be covered in this session :-
Need Of GPRS
GPRS Architecture
GPRS Terminals
GPRS Protocol
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8/14/2019 Chap 26 General Packet Radio Service
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GPRSPLMN
GSM PLMN
HLR
MSC/VLR
MSC
SGSN
SGSN
GGSN
BSS
Same Radio
for Packet
and Circuit
TrafficCircuit
Packets
SS7
GGSN
X.25
IP
IntraPLMN IP
Backbone
BSC
GPRS System Architecture
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GPRS Network Elements
GPRS includes GSNs
SGSN : Serving GPRS Support Node
GGSN : Gateway GPRS Support Node
GPRS Registers
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GPRS Network Elements
SGSN Node serving multiple MS and BSS
Establishes mobility management context
Interfaces with HLR to perform security functions and
access control
GPRS PLMNBSS
BSS
SGSNBSS GGSN
HLR
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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
GPRS PLMN
IP
PDN
BSS
BSS
SGSN
SGSN
GGSN
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GPRS Terminals
Class A
MS supports simultaneous operation of GPRS and
GSM services
Class B
MS able to register with the n/w for both GPRS &
GSM services simultaneously. It can only use one
of the two services at a given time.
Class C
- MS can attach for either GPRS or GSM services
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GPRS Speed & Profiles
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 roughly
equal amount, such as instant messaging.
2) Class 8 is also known as 4+1, means 4 slots to download
and 1 slot to upload
For applications where data is mostly downloaded,
such as web browsing.
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Routing Area Update
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
Types of Routing Area Update
Intra SGSN Routing Area UpdateInter SGSN Routing Area Update
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Topics to be covered in this session :-
Need Of GPRS
GPRS Architecture
GPRS Terminals
GPRS Protocol Architecture
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Protocol Architecture
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Protocol Architecture
Controls access attempts of an MS on radio channels shared by
several MSs
Employs algos. for contention resolution, multiusermultiplexing on PDTCH
Both ack and unack. Modes of operation are supported in
RLC/MAC layer
Medium Access Control
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Protocol Architecture
Establishes highly reliable logical link between MS & its assigned SGSN
Works either in acknowledged or unacknowledged modes
Data confidentiality is ensured by ciphering functions
Establish a reliable link between MS & BSS
Segmentation and reassembly of LLC frames into RLC data blocks
Logical Link Control
Radio Link Control
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Protocol Architecture
Used to transfer data packets between SGSN and MS
Multiplexing of several connections of network layer onto one logical
connection of underlying LLC layer Compression and decompression of user data and header information
Data Link layer
Divided into two sub layers :
LLC layer (between MS-SGSN) RLC/MAC (between MS-BSS)
Sub Network Dependent Convergence Protocol
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Protocol Architecture
Delivers routing & Quality of Service related information between BSS
and SGSN
GPRS Tunneling Protocol
GTP tunnels user data packets and related signaling
information 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 GTP
Packets within backbone network
BSS GPRS-Tunneling Protocol
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REVIEW
In this session we discussed about the:-
Need Of GPRS
GPRS Architecture
GPRS Terminals
GPRS Protocols
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