gprs edge(formatted)

8/13/2019 Gprs Edge(Formatted)

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Research Paper # 1

ON THE WAY TO 3G NETWORKS:THE GPRS/EDGE CONCEPT

Vasil P. Pribylov , Member ,IEEE, Ivan I.RezvanSiberia State University of Telecommunications & Informatics

Email: [email protected]


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Abstract

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Describe Principles and use of GPRS.

Main problems of transition towards the UMTS


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IntroductionGrowing interest in mobile data applications lead a cause of GSM toGPRS

GPRS a 2.5 G system allows the transmission of packet data at

moderate bit rates using random access channels within the 2Ginfrastructure.Mobile applications contain several characteristics that enhance thevalue to the customers Like

mobility(constant voice & data services while on the move)immediacy (obtaining connectivity when needed, regardless oflocation and without a lengthy login session). localization (allows subscribers to obtain information ontheir current location) 3


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Introduction cont.

GPRS Protocol Stack is important as a migration steptoward third-generation (3G) networks.

When GSM operators start to offer GPRS services, theycan use their existing networks and gradually assignpart of their resources from circuit-switched voiceservices to packet-switched data services.

This allows a smooth transition from voice-only tomultimedia service networks.

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GPRS BACKGROUND Enable new & existing applications onto GSM

Enhancement of GSMs functional & QoS parameter.

GPRS shall support both connectionless & connection orientedservices.

Offer flexible service at low cost to the user.

Use scarce network resources as efficiently as possible

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GPRS BACKGROUND cont The GPRS operator shall be responsible fortransferring data between the service access pointsat the fixed side and at the mobile side. The flow ofdata shall be possible in three scenarios.

1. Packets sent from a mobile access point to afixed network access point.

2. Packets sent from a fixed network access pointto a mobile access point.3. Packets sent from a mobile access point to a

mobile access point via the GSM operator

infrastructure 7


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Principles of GPRSUsers specifically need a mobile phone or terminal supporting GPRS ,subscription to a network.

GPRS network resources accessed only when data actually need to be

transmitted between the GPRS user and the network.

Data are divided into packets and then transmitted via the radio & coreGPRS network.

Packet switched traffic is separated from circuit switched traffic atBSC & diverted to GPRS core network.


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GPRS use GMSK modulation scheme.

Information is coded in the increase(+ve shift) or (-ve shift) of thecarrier phase.

In GMSK ,initially signal passed through pre-modulation Gaussianfilter for pulse-shaping.

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Principles of GPRS (Cont.)


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GPRS NODES


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Frequency reuse factorError coding scheme(CS)Data packet delay

Strong channel coding : convolutional code recovers most of thetransmission errors. However , the effective throughput of data packetsis small due to the low code rate.

Weak channel coding : Each RLC block carries a high payload & thewhole RLC block has to be retransmitted.

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Link Layer Performance of GPRS Network


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GPRS Limitations & Security AspectsTheoretical maximum GPRS data transmission speed only when a userutilize eight timeslots without any protection.

Bandwidth available to a GPRS user is severely limited.

Misuse of their resources by unauthorized persons using manipulatedmobile stations.

Eaves-dropping the information being exchanged on the radio path.

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MS authentication: Protection of GPRS subscribers by denyingintruders the ability to impersonate authorized users

Access Control: Network can support restrictions on access by or to

different subscriber e.g. location, screening lists etc.

User Identity Confidentiality: User identity is not disclosed tounauthorized individuals, entities or processes.

User Information Confidentiality: the property that the userinformation is not made available or disclosed to unauthorisedindividuals, entities or processes. The purpose is to provide for

confidentiality of user data. 13

GPRS Limitations & Security


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EXPERIMENT experimented with the Eriksson R580m mobile phone(using 4+1 time slots four slots in downlink for

receiving and one slot in uplink for requesting theinformationGPRS connection with one of Novosibirsk GPRSoperators Siberia Cellular Systems network of Russia.

web-site www.nsk.mts.ru

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http://www.nsk.mts.ru/http://www.nsk.mts.ru/


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Result

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INTRODUCING EDGE EDGE is an enhanced version of GPRSusing a different modulation technique, eight-level

Phase Shift Keying (8PSK), that has a spectralefficiency of 3bits/s/Hz in comparison of GMSKs1bit/s/Hz.For this reason EDGE requires a hardware upgrade of

the RF part in the base stations.

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Conclusion and Future WorkGPRS allows network operators to implement an IP-based corearchitecture for data applications, which continues to be used andexpanded upon in 3G services for integrated voice and dataapplications

Speed is still not fulfilling the demand of customers.Advancement in GPRS system will be the use of improved codingtechniques.

GPRS proves to be a testing & development area for new services &application which will be used for 3G services.

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Conclusion and Future Work

,GPRS/EDGE acts as transition technique towards 3G& a great need of UMTS/GSM dual-mode.

But UMTS operators can not start planning from zerosince the best solution is that the existing GSM basestation sites are to be the primary sites for UMTS basestations.

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REFERENCES [1] GPRS Overview,http://www.vocal.com/data_sheets/gprs1.html.[2] GSM World: GPRS Platform,http://www.gsmworld.com/technology/gprs/index.shtml.[3] ETSI TR 101.186 V6.0.0 (1998-04): General Packet

Radio Service (GPRS), 19 p.[4] Cellular System Solutions for GSM/GPRS WirelessTerminals, 21 March 2003,http://www.3g.co.uk/PR/March2003/5070.htm.

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Thank you

gprs edge(formatted)

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