gps

The Cellphone

Cell phones are so called because the physical area basically covering are a formatted cells. The origin of the cell phone is said that was way back in 1973 when the electronics company consumer Motorola launched the first portable cell phone, which was marketed under the name of Motorola DynaTAC 8000X.

Currently, the number of cell phone models entering the market is almost incalculable, and its sales generates hundreds of billions of dollars a year, so today is considered as the most used electronic device in the world.

The Cellphone

As we can see in any city or town, it is almost impossible to find a person without a cell phone or smartphone in hand, such is the degree of penetration that this device has reached between us, and it is no wonder, because thanks to the tasks which he is able to meet, and the number of important built in functions, we can improve our lifestyle, increasing our productivity and reducing times.

This last decade has seen the birth of the smartphone as we know it today, mixing computer and cell phone offers features with which we could not even dream at the time that was fashionable the Nokia 3210, for example.

But to know more about the smartphone and technology, click on this link.

What hardware integrates a cell phone?

The parts of a traditional cell phone are:

  • Circuit board
  • Antenna
  • Keyboard
  • LCD Screen (Liquid Crystal Display)
  • Battery
  • Microphone
  • Speaker

The Cellphone

Functions of a cell phone

Cell phones have a variety of functions. To name a few, depending on the type of cell phone:

  • Store contact information
  • Manage an agenda of commitments to date
  • Send and receive e-mails
  • 3d games
  • Send and receive text messages
  • Surf websites
  • Play mp3 and other audio formats
  • Play video and TV online
  • GPS service and maps of most cities in the world
  • Integration with other devices such as GPS receiver

The Cellphone

How a cell phone works?

Cell phones, operating on radio frequency, innovated to minimize the availability of RF spectrum. Now, several cell phone towers antennas are used to cover a large geographical area. Each tower (base station) covers a circular area called cell. A large geographic region is divided into a number of cells, allowing different base stations use the same channels / frequencies for communication.

Another important aspect of this division in cells, is that cell phones need less power to transmit to reach any base station and covering a smaller area. Reducing the energy required for transmission, battery size and weight is reduced accordingly. This contributes to the reduction in size of cell phones would not be possible without the cellular technology.

When you use your cell phone, your phone locates first base with the strongest signal station and requests a channel. The base station allows access to the channel and the call is then accepted. The call is then sent to the local telephone network if the call is for a common phone, otherwise will be transmitted by the mobile network.

The Cellphone

When the cell phone is connected, the SID (System Identification Code) in the control channel is equivalent to the SID the phone. If the SID is identified, the phone understands that the cell is communicating with the local system. The phone sends a registration request, along with the SID and the MTSO keeps the course of the phone’s location in the database. If the control does not identify the SID of your phone, then your phone is roaming.

Major cell phone manufacturers

Most popular cell phone models on the market are produced by Nokia, Sony Ericsson, Motorola, Samsung, LG and Alcatel, among many others.

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Location of cell phones through GSM and GPS

For years, many institutions of the world, especially those related with security forces, have used the location of cell phones with which emergency calls are made, in order to locate the telephone equipment and therefore the person that is in trouble.

This active location method is one of the oldest used to establish the correct location of a mobile phone. As currently have begun to implement tracking passive mode, through using GSM networks and the GPS, the satellite position system.

Cell phone GPS GSM location

Through the use of GSM networks to locate a cell phone, it is no longer necessary to make a call to said mobile phone in order to geographically locate the device, although it should be noted that the device must be turned on so that the search can conclude with successful results.

The method of location through GSM works very simply, since it is basically set the current position of the phone using a technique called “Triangulation”.

Similarly, most mobile operator companies include, among its client services packs, options that providing device location through GSM technology.

For this, the service is based on various factors and search methods, in order to establish almost exactly the physical location of a mobile phone using the passive technique.

Cell phone GPS GSM location

One of the most currently used methods is called Cell of Origin (COO), and as its name implies base their search on including cell ID, and ID Enhanced Cell ID.

The technique that uses the cell ID, allows for remarkable accuracy location, which can roughly locate a mobile phone with an accuracy of up to 200 meters radius in urban areas, up to 2 kilometers in suburban areas, and up to 4 kilometers in rural zones.

In the other hand, the method using Enhanced Cell ID data, enables further improved location accuracy, particularly with respect to rural areas, reducing the radius in approximately 550 meters.

Cell phone GPS GSM location

There is another localization method based on the observed time difference, also known as technical E-OTD, an acronym of Enhanced-Observed Timed Difference.

In this case, it is possible to achieve an accuracy of 170 or 650 ft each three base stations, which depends directly on the number of LMUs that are available on the network at that time.

Other methods used very often are “Time of Arrival”, as well “Angle of Arrival” and “Enhanced Observed Time Difference”, i.e. improved time difference estimate, and the system known as “Assisted GPS”.

Cell phone GPS GSM location

The latter method, which is performed by triangulating the physical location of the cell phone, through the use of satellites, is one of the techniques implemented today, because of the high accuracy of results provided by this type of technology.

It is for this reason that most mobile phones sold in the market today, especially those mid-range to high, include this fabulous feature among its main options, in order to offer users a secure method to locate the device in case of possible loss or theft of it.