How did we ever manage without our cell phones? It is truly amazing to even think that there was a time not too long ago when we did not have our mobile handsets with us when we ventured out of our homes or offices. Let us try and demystify some of the technologies often related with our mobile phones that we get to hear often and understand very little of.
GSM or the Global System for Mobile Communication is the most widely adopted cellular phone standards across the world. It is estimated that more than 80% of the total mobile phones in the world use this particular technology. The GSM standard requires the mobile phone to search for a GSM network or in other words there must be a compatible cell in that particular locality in order to use the GSM standard. The GSM standards apply to cellular networks, which are networks that operate on radio frequencies and comprise of cells.
[...] Smart phones combine the features of a mobile phone and a computer and give high speed data connectivity using the Internet. Some examples of smart phones include Blackberry, the Nokia E Series range of phones, Apple phone, HTC Touch, Palm Pre etc. All these phones are loaded with features to help you keep connected and to help you work without losing valuable time. They all have specific operating systems installed and have basic spread sheet applications, applications for developing presentations and applications for creating text files. [...]
[...] The downside of CDMA is the fact that some countries such as China have banned it in order to establish a common standardized protocol in the area of mobile communications. 3G Networks Third generation of cellular technology, also known as 3G, has advanced features such as video phone and high speed internet connection. 3G technology was first introduced in Japan in 2001. Also known as International Mobile Telecommunications-2000 (IMT-2000), 3G or 3rd Generation, is a compilation of certain standards laid down for mobile communications by the International Telecommunications Union. [...]
[...] Mobile phones work on the duplex principle where both the users can communicate. If more than two users can simultaneously transfer data, it is known as multiplexing. TDD and FDD Wireless duplexing entails using two separate bands of frequencies—one for downlink and the other for uplink. This pairing of frequency bands is known as paired spectrum. The method is known as FDD, the acronym for Frequency Division Duplex. A “guard band” separates the two frequencies. TDD, as has been explained earlier, uses the same band of frequency or one frequency band for both-way communication. [...]
[...] This happens when it moves out of range of one base and connects with the next available base—an action that is coordinated by a GSM controller located in the base station in conjunction with the technology incorporated in the mobile handset. The GSM handset checks for the strongest signal and connects with it, while the weakest signal is taken up by the user who is available immediately after the previous user. CDMA (Code Division Multiple Access) Technology CDMA or Code Division Multiple Access Technology allows multiple signals to use the same frequency, which results in a highly cost efficient system of networks that employs a much lesser number of communication points as opposed to TDMA. [...]
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