Posts Tagged ‘mobile phone’

This blog http://thebestringtonesblog.com details how to download free ring tones, and recommended sites to find the best ring tones. There are a couple of videos detailing sites that list some of the better and comical ring tones that can be downloaded either free or for a small fee. In addition, this site has numerous articles on some of the latest cell phones from Nokia and Verizon, as well as numerous additional articles on polyphonic ring tones, and sites that can be reviewed to download ring tones.

In addition, the process of downloading ring tones is briefly explained, per the following; a ring tone maker allows a user to take a song from their personal music collection, select whatever section of a particular song they especially like and send the file to their cell phone. Files can be sent to a cell phone by direct connection (e.g., USB cable), Bluetooth, text messaging, or e-mail.

Some cell phone providers allow users to create their own music tones, either with a "melody composer" or a sample/loop arranger (such as the MusicDJ in many Sony Ericsson phones). These often use encoding formats only available to one particular phone model or brand. Other formats, such as MIDI or MP3, are often supported; they must be downloaded to the phone before they can be used as a normal ring tone.

Technorati Tags: cell phones, free ringtones, mobile phone, nokia, polyphonic ringtones, ringtones, seasonal ringtones, verizon

Working Of Cell Phones

Cell phones, which operate on radio frequency, cover compartmentalized cell like areas with the help of base stations. Learn more. It’s truly amazing when you think how far we have come in the technology of cellular phones.

Cell phones or cellular phones are so called as they cover compartmentalized, cell like areas. The origin of the Cell phone can be traced back to the year 1973 when Motorola came up with World`s first cellular portable telephone which was commercialised as Motorola DynaTAC 8000X.

These days, new cell phones are being added at a rapid pace. The parts of them typically consist of following: circuit board; antenna; keyboard; LCD – liquid crystal display; battery; microphone; speaker.

In recent times, they are available with a wide range of functions. To list a few functions, depending on the type of cell phone you choose: store contact information; keep track of appointments; set reminders; prepare to-do lists; send/receive e-mail; play games; send text messages (sms); access to internet; watch and enjoy TV; built-in calculator; integration with other devices like GPS receivers, MP3 players, etc.

Cell phones, operating on radio frequency, have come up with an innovative cellular approach to counter limited availability of RF spectrum. Now, several cell phone towers are used to cater to a large geographic area.

Each tower (base station), covers a circular area called a cell. A large region is split into a number of cells allowing different base stations to use the same channels/frequencies for communication. This enables thousands and thousands of mobile telephone users to share far fewer channels.

Another important aspect is that, phones need less power to transmit to reach any base station as each base station covers a smaller area. Reducing the required transmit power reduces the size of the battery and thereby the weight of the phone. This has led to miniaturization of cell phones which would not have been possible without the cellular technology.

When you use your cell phone, following things happen. First the phone locates base station having strongest signal, and requests for a channel assignment. The base station permits channel assignment and the call gets accepted. The call is then forwarded to the local telephone network if it is to a regular phone otherwise it is transmitted through the cellular network. The call is then sent to its destination through the telephone network.

When the cell phone is switched on, SID (System Identification Code) on the control channel compares it to the SID programmed into the phone. If the SIDs match, the phone understands that the cell is communicating with home system. The phone sends a registration request, along with the SID and the MTSO keeps track of the phone`s location in a database. If the SID on the control channel does not match the SID of your phone, then the phone is in roaming.

The three technologies commonly used by 2G cell phone networks for transmitting information: frequency division multiple access (FDMA); time division multiple access (TDMA); code division multiple access (CDMA).

GSM (Global System for Mobile communications) implements TDMA, to connect to the specific service providers in different countries. GSM uses subscriber identification module (SIM). SIM stores all the connection data/identification numbers needed to access a particular wireless service provider.

Standard 2.5G protocols used widely are GPRS, EDGE to name a few. Some latest 3G protocols are: Universal Mobile Telecommunication Service (UMTS); Wideband Code-Division Multiple Access (WCDMA); High-Speed Downlink Packet Access (HSDPA); Evolution Data Maximized (EVDO).

A few popular cell phone models in the market have been offered by Nokia, Ericsson, Motorola, Samsung, LG, etc. with each model with its own range of collections.The year 2008 may be a high watermark in the cell phone history with Nokia N-Gage 2, HTC Dream, Apple iPhone 2, BlackBerry Touchscreen, Sony PlayStation Phone which are expected to be launched.

This article can be accessed in portuguese from the Article section of page Cell_Phone

Roberto Sedycias works as IT consultant for PoloMercantil.

Mobile Phone Signal Booster

Now that we’re settled in the house, we’ve noticed that our mobile phone reception is quite poor. We both work at home quite often and use our mobiles when we do, so have been looking for a mobile phone signal booster.

First public cell

Cellular phones from the early 1990’s are considered second generation (2G) and they were able to work on mobile phone systems such as GSM, IS-136 (TDMA) and IS-95 (CDMA). Digital mobile phone networks were in use in the United States.

Verizon software to mobile phones

Jill plans to build a “mobile widgets” for future phones will likely work on any operating system, Verizon decision support in its future smartphones. Seven organizations are currently fighting for the inner track to start the mobile computer in the future.

Technorati Tags: 2g, cell phones, gsm, how does a cell phone work, mobile phone, Mobile Technology

TDMA is the acronym for Time Division Multiple Accesses, referring to a digital transmission format.  Basically, what TDMA does is to divide a single radio frequency into time slots so that multiple users can use the same bandwidth at the same time.  One channel is divided into six time slots and each signal is allocated two of the six slots — i.e. 3 different callers on one channel at one time. This concept is illustrated below.  A you can see, this type of transmission enables a more efficient use of the bandwidth in that is fills the "dead air" created by one call with calls between other parties.  TDMA technology is used in second generation mobile phone systems know as D-AMPS (or Digital Advanced Mobile Phone Systems).  TDMA uses IS-54 (this first cut at a sstandard) and was replaced by IS-136.  These defined the authentication alogorithms used to encrypt mobile communications.

Technorati Tags: cell phone, channel, mobile phone, tdma, time division multiple accesses