4g Communication Systems

7/28/2019 4g Communication Systems

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BY:

A.LALLA.


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INTRODUCTIONThe approaching 4G (fourth generation)mobile communication systems areprojected to solve still-remaining problems of 3G (third generation) systems and toprovide a wide variety of new services, from high-quality voice to high-definitionvideo to high-data-rate wireless channels. The term 4G is used broadly to includeseveral types of broadband wireless access communication systems, not only cellulartelephone systems. One of the terms used to describe 4G is MAGICMobilemultimedia, anytime anywhere, Global mobility support, Integrated wirelesssolution, and Customized personal service. As a promise for the future, 4G systems,that is, cellular broadband wireless access systems have been attracting much interest in the mobile communication arena. The 4G systems not only will support the nextgeneration of mobile service, but also will support the fixed wireless networks.4G mobile systems have been significantly improving in terms of interactive multimedia

services also.


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EVOLUTION OF WIRELESS SYSTEMS:

a) First generation.

b) Second generation.

c) Third generation.

d) Fourth generation.


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Reasons to have 4G

Communication systems:

1. Support interactive multimediaservices: teleconferencing, wirelessInternet, etc.

2. Wider bandwidths, higher bit rates.

3. Global mobility and service portability.

4. Low cost.

5. Scalability of mobile networks.


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Objective and approach


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Keys of 4G infrastructures. Accessing information anywhere, anytime, with a seamless connectionto a wide range of information and services, and receiving a largevolume of information, data, pictures, video, and so on.

The future 4G infrastructures will consist of a set of various networksusing IP (Internet protocol) as a common protocol so that users are incontrol because they will be able to choose every application andenvironment.Based on the developing trends of mobile communication, 4G will havebroader bandwidth, higher data rate and smoother and quicker handoffand will focus on ensuring seamless service across a multitude of wirelesssystems and networks.Personalised service will be provided by the new generation network.4G systems also provide facilities for integrated services. Users can usemultiple services from any service provider at the same time.Application adaptability and being highly dynamic are the main featuresof 4G services of interest to users.


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2. INTERNET SPEEDS2.5G is the interim solution for current 2G networks to have 3G functionality. 2.5Gnetworks are being designed such that a smooth transition (software upgrade) to 3G

can be realized. 2.5G networks currently offer true data speeds up to 28kbps. In

comparison, the theoretical speed of 3G can be up to 2 Mbps, i.e., approximately 200

times faster than previous 2G networks. This added speed and throughput will make

it possible to run applications such as streaming video clips. It is anticipated that 4G

speeds could be as high as 100 Mbps. Thus, 4G will represent another quantum leap

in mobile Internet speeds and picture quality. Ericsson confirms that 4G could bring

connection speeds of up to 50 times faster than 3G networks and could offer three-

dimensional visual experiences for the first time. The following graph represents what

has been the typical progression of wireless communications:


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4G APPLICATIONS AND THEIR BENEFITS TO PUBLIC SAFETY:

1.Virtual navigation.

2.Tele-medicine.

3. Crisis-management applications.


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5. LIMITATIONS OF 4GAlthough the concept of 4G communications shows much promise, there are still limitationsthat must be addressed. One major limitation is operating area. Although 2G networks are

becoming more ubiquitous, there are still many areas not served. Rural areas and many

buildings in metropolitan areas are not being served wellby existing wireless networks. This limitation of todays networks will carry over into future

generations of wireless systems.The hype that is being created by 3G networks is giving the general public unrealistic

expectations of always on, always available, anywhere,anytime communications. The public must realize that although high-speed datacommunications will be delivered, it will not be equivalent to the wired Internet at least not

at first. If measures are not taken now to correct perception issues, when 3G and later 4G

services are deployed, there may be a great deal of disappointment associated with the

deployment of the technology, and perceptions could become negative. If this were to

happen, neither 3G nor 4G may realize its full potential. Another limitation is cost. Theequipment required to implement a next generation network is still very expensive. Carriers

and providers have to plan carefully to make sure that expenses are kept realistic. One

technique currently being implemented in Asian networks is a Pay-Per-Usemodel of services. This model will be difficult to implement in the United States, where the

public is used to a service-for-free model (e.g., the Internet).


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conclusion


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Quires?

4g Communication Systems

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