Tuesday, March 6, 2012

Third Generation (3G) Wireless System


               Today, internet connection is available in mobile phones. This is made possible by using GPRS technology, but now there are modern methods in accessing internet through mobile phones, these are 3G and 4G technologies.

                GPRS uses packet data technology. With packet networks, you can immediately access the mobile internet. This enables you to access the existing applications of the internet such as email and web browsing without dialing into an ISP. Using the medium or the radio link, several users can share the same radio channel very efficiently. With packet data, users will only pay for the amount of data they actually communicate and not the idle time. Packet based communication is compatible with all other types of communication. GPRS can support the Internet Protocol (IP) as well as X.25 protocol.

                   There is a new technology that takes cellular community closer to UMTS or the 3G. It has a new modulation scheme called 8-phase shift keying (PSK). It also provides higher data rates than GPRS. This technology is called Enhanced Data for Global Environment (EDGE). The data rates allocated for EDGE are started at 384 Kbps and above as a second stage to GPRS. EDGE uses a combination of FDMA and TDMA as the multiple access control methods. If we view the OSI stack model, EDGE uses FMDA and TDMA at the MAC layer.

                    EDGE is very special because its bandwidth is efficient than the GMSK modulation scheme used in the GSM standard, it creates a new modulation scheme. This technology provides a new physical layer: 8- PSK modulation, instead of GMSK. EDGE still retains existing GSM parameters. These include frame length, eight time slots per frame, and a 270.833 KHz symbol rate. These techniques help EDGE to promote worldwide or globally into the market.

                         UMTS is part of a global family of 3G mobile communications systems. It takes full advantage of the trend of converging existing and future information networks, devices and services, and the potential synergies that can be derived from such convergence. 

                          Mobile internet has many applications. There are applications for moving to a wireless and a 3G environment. These applications are customized infotainment, multimedia messaging service, mobile intranet/extranet access, mobile internet access, location based services rich voice, wireless advertising, mobile information, business solutions, mobile transactions, mobile entertainment, person-person communications and bearer entrance and periodic.

                            There is an issue that needs to consider whether to simplify provide a wireless IP pipe to a service offering hosted elsewhere on the internet, or to go for an interoperable end-to-end solution. In wireless IP pipe business using tunneling protocols will become a commodity operation, where cost, coverage, and data rate are the only competitive dimensions.

Here are some advantages and disadvantages of 3G:
Advantages:
·         Overcrowding is relieved in existing systems with radio spectrum.
·         3G has more bandwidth, security and reliability.
·         Provides interoperability among service providers.
·         Availability of fixed and variable rates.
·         Support to devices with backward compatibility with existing networks.
·         Always online devices – 3G uses IP connectivity with existing networks.
·         Rich multimedia services are available
Disadvantages:
·         The cost of cellular infrastructure, upgrading base stations is very high.
·         Needs different handsets.
·         Roaming and data/voice work together has not yet been implemented.
·         Power consumption is high.
·         Requires closer base stations and are expensive.
·         Spectrum-license costs, network deployment cost and handset subsidies subscribers are tremendous. 


Sources:
Broadband Telecommunications Handbook by Regis J. Bates
http://www.careerride.com/3g-advantages-and-disadvantages.aspx

3 comments:

  1. The 3G has the speed that the user wanted and is the latest that has been wide spread to the world today. 3G is the most common use of the people today. Good Job ^_^

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  2. The current generation of cellular transmission, which primarily features higher speeds for Internet access.

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  3. another thing 3G refers to the third generation of mobile telephony (that is, cellular) technology. The third generation, as the name suggests, follows two earlier generations.

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