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7/28/2019 Overview of Gprs-edge
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GPRS / EDGE Overview
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What is GPRS ?
GPRS is a new non-voice value added service that allowsMobile Phones to be used for sending and receivingdata over an IP based network.
GPRS as such is a data bearer that enables wireless
access to data networks like Internet , enabling user toaccess E-mails and other Internet applications usingMobile phones.
With GPRS we can enjoy a continuous wireless connectionto data networks (Internet) and access our favorite
web sites, entertainment services and other webapplications.
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How does it work ?
In GPRS data is handled as a series of packets that canbe routed over several paths through the network,rather than as a continuous bit-stream over a dedicatedconnection.
With GPRS the information is split into separate butrelated packets before being transmitted andreassembled at the receiving end.
**In 2G networks calls are handled using circuit switchingtechnology.A dedicated circuit or time slotis allocated
between two points for the duration of a call.No other phonecan use this circuit during the call, regardless of whetherany data is being transmitted or not.**
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Why GPRS ?
Efficient use of existing GSM network.
Higher bit rate.
Use of Internet applications in mobile sets.
Long massages sending capability.
Good file transfer facility .
Increase spectrum efficiency.
More revenue generation.
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Circuit Switched vs Packet Switched
Circuit Switched
Packet Switched
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CS PS
* End to end connection * No Connection
* Dedicated resources * Not Dedicatedresources
* 30 40 % efficient use * More efficient use
* Speech is transferred in RT * Packet buffering&delay
* Error detec. and correc. not * Error det. & corr.
Possible* Charging based on time * Charging based on
volume
Circuit Switched vs Packet Switched
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Key User features of GPRS
Speed
Rich Media Applications
Internet on the Mobile
Always On
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GPRS for packet switched services
MSC
BSCBTS
PSTN
INTERNET
CS
PSGPRSBackbone
IP NetworkSGSN
GGSN
GPRS Core Network
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Conceptual view of GPRS
BTS BSC
GSM Voice
GPRS Core
Access Point
Internet
Corporate Internet
Shared GSMGPRS
Infrastructure
GPRSInfrastructure
IP World
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GSM to GPRS
Element Software HardwareMS Upgrade required Upgrade required
BTS Upgrade required No Change
BSC Upgrade required PCU Interface
TRAU No Change No Change
MSC/VLR Upgrade required No Change
HLR Upgrade required No Change
SGSN New New
GGSN New New
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Upgradation to GPRS
How to upgrade a GSM network to GPRS?
1. For the BSS software upgrade
hardware upgrade
(PCU)
2. New GPRS support nodes (SGSN GGSN)
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MAIN ADVANTAGES FOR OPERATORS
More Revenue
Huge Potential Market for Data Services
Fast Roll-out and Continuous Network Expansion
GPRS uses excess voice capacity for data
.
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GPRS Vs GSM1. Supports both circuit switched Only circuit switched.
as well as packet switched service.
2. MS Utilizes Automatic No re-transmission isretransmission (ARQ) at provided.data link layer to re-transmiterror frames.
3. Multiple time slots can be Single time slot per user.allotted to a single user
4. One time slot can be allotted Single time slot per user.to several users.
5. Charging/ billing more complex Simple time-based billing.(Volume based, Q.O.S. based)
GPRS Vs GSM
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* Communications- E-mail, fax,
intranet/ internet access.
* Value added services - Information services, games,e-commerce.
* Location-based applications -Navigation, traffic conditions,airline/rail schedule, location finde
* Vertical applications - Freight delivery, fleet managemen
sales-force automation
* Location sensitive A user nearing a cinema hall orAdvertising - a restaurant receives flashes of
advertisement
TYPICAL GPRS SERVICES
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GSM NETWORK ELEMENTSThe Main elements of GSM are:
NSS :MSC
VLR
HLR (Includes Authentication Center and Equipment IdentityRegister)
BSS :BSC
BTS
Transcoder
NMS
Fault ManagementConfiguration Management
Performance Management
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GSM Network
PSTN
BSC
GSM
BTS
GSM
BTS
MSC
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PSTN
BSC
GSM
BTS
GSMBTS
MSC
GSM + GPRS Network
PCU
Other nets
GGSN
SGSN
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Authentication, Authorization
GTP tunneling to GGSN
Ciphering & compression
Mobility Management
Session Management
Interaction with HLR, MSC/VLR
Charging & statistics
NMS interfaces
SGSN Role
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GGSN Role
Interface to external data networks
Encapsulate in GTP and forwards end user
data to right SGSN
Routes mobile originated packets to rightdestination
Filters end user traffic
Collects charging and statistic informationfor data network usage
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Different GPRS Capacity Types
TRX 1
TRX 2
CCCH TS TS TS TS TS TS TS
TS TS TS TS TS TS TSTS
CircuitSwitchedTerritory
PacketSwitched
Territory
Territory border moves basedon Circuit Switched traffic load
GPRSCapacity
DedicatedGPRS
Capacity
TS TS
AdditionalGPRS
Capacity
TS TS
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MS Class
Type C GPRS only(or manually switched between GPRS and speech modes)
Type B GPRS and Speech (not at same time)(Automatically switches between GPRS and speech modes)
Type A GPRS and Speech at the same time
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GPRS Channel Coding Schemes
Increasing Protection against error
Increasing Data Throughput rates
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EDGE Provide 3G services today
Provide 3G services with existing licenses
New modulation optimized for wireless data services
high possible data rate
Covered by existing GSM licenses
Same channel structure, network infrastructure, frequency
planning and protocol as todays GSM
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M
SBTS
P
C
U
BSC MSC/VLR
HLR
SGSN GGSN
Backbone
Network
ISP Network
Corporate
Network
AUC
SMS G/IW MSC
Gb
Gd
Gs
Gn
Gr
Gn
GiEDGE
TRUM
S
Evolution to EDGE
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voice voice voice voice voice
Standard GSM Transceiver
voice voicevoicevoice voiceFree
TSData
Free
TS
EDGE Transceiver
EDGE increases capacity
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EDGE
Impact of EDGE on existing GSM/GPRS networks
Hardware upgrade to the BSS (new transceiver in each cell)
Software upgrade to the BS and BSC
No change in the core networks
New terminals
- Terminal which provides 8PSK in the uplink and the downlink
- Terminal which provides GMSK in the uplink and 8PSK in thedownlink
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EDGE
EDGE benefits
Short-term benefits: Capacity and performance
Easy implementation on a GSM/GPRS network
Cost effective
Increase the capacity and triples the data rate of GPRS
Enabling new multimedia services
Long-term benefit: Harmonization with WCDMA
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System upgrade for EDGE
EDGE TRU
B
S
C
BSC Software Upgrade
R
B
S
EDGE enabled RBS
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What EDGE would mean to subscribers
Streaming Applications
Very high speed downloads
Corporate Intranet connections
Quicker MMS
Video Phone
Vertical corporate applications Video
Conference, Remote presentations
Services benefit from EDGE
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MMS
Downloads WAP browsing
Video streaming
Push-to-Talk (PoC) To orderclick here
Video 00:20
Record Back
Services benefit from EDGE
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AN
PRESENTATION