overview of gprs-edge

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

overview of gprs-edge

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