By. :-Ekta MishraRegd No. :- 0701218142Branch :- ETE7th semester 2010Purushottam Institute Of Engineering & Technology*

* Introduction. What is 3G ? What is Wi-Fi ? Similarity between 3G & Wi-Fi. Difference between 3G & Wi-Fi. Implications in Industry Structure & Public Policy.Conclusion. Discussion.How 3G works. How Wi-Fi works.

The 3G network is the third generation of mobile networking and telecommunications. It features a wider range of services and advances network capacity over the previous 2G network. The 3G network also increases the rate of information transfer known as spectral efficiency.*Wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. The Wi-Fi Alliance, the organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi as any "wireless local area network

*Based on the International Telecommunications Union standards, the 3G network is the third generation of mobile networking and telecommunications. A 3G network provides for download speeds of 14.4 megabits per second and uploads speeds of 5.8 megabits per second. The minimum speed for a stationary user is 2 megabits per second. Japan and South Korea were the first countries to successfully launch this network. The Japanese company FOMA launched in May 2001 and South Korea's SK Telecom launched in January 2002. Delays on the roll-out process of the 3G network impacted the growth of mobile technology in many countries. This network uses a different radio frequency than 2G, which forced many companies to build entirely new infrastructure and obtain additional licenses.

*The name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. The Wi-Fi Alliance, the organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi. Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency (RF) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation.Any products that are tested and approved as "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers.

A common misconception is that the term Wi-Fi is short for "wireless fidelityhowever this is not the case. Wi-Fi is simply a trademarked term meaning IEEE 802.11x.

*The 3G network might be divided up in hierarchical fashion:

Macro cell - the area of largest coverage, e.g., an entire city. Micro cell - the area of intermediate coverage, e.g., a city centre. Pico cell - the area of smallest coverage, e.g., a "hot spot" in a hotel. Why is there this sub-division of regions? It is because smaller regions (shorter ranges) allow higher user density and faster transmission rates. This is why they are called "hot spots".

*TDMA vs. CDMA

We have considered how a mobile phone can send and receive calls at the same time (via an uplink and a downlink). Now we will examine how many users can be multiplexed into the same channel (i.e., share the channel) without getting interference from other users, a capability called multiple accesses.For 3G technology, there are basically two competing technologies to achieve multiple accesses: TDMA and CDMA.TDMA is Time Division Multiple Access. It works by dividing a single radio frequency into many small time slots. Each caller is assigned a specific time slot for transmission.CDMA is Code Division Multiple Access. CDMA works by giving each user a unique code. The signals from all the users can then be spread over a wide frequency band. The transmitting frequency for any one user is not fixed but is allowed to vary within the limits of the band.

*Circuit Switching vs. Packet SwitchingTraditional connections for voice communications require a physical path connecting the users at the two ends of the line, and that path stays open until the conversation ends. This method of connecting a transmitter and receiver by giving them exclusive access to a direct connection is called circuit switching.Most modern networking technology is radically different from this traditional model because it uses packet data. Packet data is information which is:

Given a destination address,Mixed with other data from other sources,Transmitted over a line with all the other data,Reconstituted at the other end.

5.Reconstituted at the other end.

Packet-switched networks chop the telephone conversation into discrete "packets" of data like pieces in a jigsaw puzzle, and those pieces are reassembled to recreate the original conversation. Packet data was originally developed as the technology behind the Internet.

*The wireless adapter of a computer translates data into radio signals and transmits the signals over an antenna. The transmitting antenna is generally connected to a DSL (Digital Subscriber Line) or a LAN-based Internet connection. The Wi-Fi signals have a range of about 120 feet indoors and 300 feet outdoors. With an increase in the distance between the user and the signal, the connection speed decreases. Wi-Fi connections allow you to get rid of the clutter of wires.The use of Wi-Fi technology for Internet access is on the rise. Companies and households have begun opting for wireless Internet access.

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Both are wireless.

Both are access Technology.

Both offer broadband data service.

*Current business models/deployment are different.As noted above 3G represents an extension of the mobile service provider model. This is the technology of choice for upgrading existing mobile telephone services to expand capacity and add enhanced services. In contrast, Wi-Fi comes out of the data communications industry (LANs) which is a by-product of the computer industry. The basic business model is one of equipment makers who sell boxes to consumers. The services provided by the equipment are free to the equipment owners.Spectrum policy and managementOne of the key distinctions between 3G and Wi-Fi that we have only touched upon lightly thus far is that 3G and other mobile technologies use licensed spectrum, while Wi-Fi uses unlicensed shared spectrum. This has important implications for (1) Cost of service; (2) Quality of Service (QoS) and Congestion Management..

*Implication in Industry Structure..Wi-Fi is good for competition The success of WIFI wireless local access alterative is likely to be good for local competition If both 3G and Wi-Fi survive, then the diversity of visible networking infrastructure strategies will be conductive to greater facilities-based competition. Success of the Wi-Fi service model could help unlock the substantial investment in private networking infrastructure that could be used as the basis for constructing an alternative infrastructure to the PSTN and cable wire line networks. Wi-Fi service model survives, then we would expect this to be inherently more competitive because of the lower entry barriers for setting up local property services. Wi-Fi model depends on wore line infrastructure to connect to the Internet Backbone.

*Wi-Fi and 3G can complement each other for a mobile provider

Each of the technology has distinct advantages over the other that would allow each to offer higher quality services under disparate.

3G and Wi-Fi networks provides the opportunity to offer both near coverage with good voice telephony support.

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4. Success of Wi-Fi is potentially good for multimedia content..

Multimedia content benefits for higher bandwidth services so the ability to support higher speed wireless access may help encourage the development of broadband multimedia content.

*5. Technical progress favors heterogeneous future..

Technical progress in wireless services favors a heterogeneous wireless future.

Once the world accepts the need to coordinate heterogeneous technologies.

* This article offers a qualitative comparison of two wireless technologies that could be viewed as simultaneously as substitute and/or complementary paths for involving to broadband wireless access. The two technologies are 3G, which is the preferred path for mobile providers, and Wi-Fi , one of the many WLAN technologies..

*Wise Geek-http://www.wisegeek.com/what-is-a-3g-network.htmWebopedia-http://www.webopedia.com/TERM/W/Wi_Fi.htmlThree-g-http://www.three-g.net/3g_technology.htmlWi-Fi planet-http://www.wi-fiplanet.com/tutorials/article.php/1577551Howstuffworks-http://computer.howstuffworks.com/wireless-network.htm

*Questions