Mobile networks is potentially good location, infrastructure is well developed, and having a characteristic localization intrinsic because a user can use mobile phone must be connected to the network and connection points in the network are fixed, and well located for the network operator. Infrastructure mobile networks based on relays is not very dynamic positioning relay and distribution of cells in the relay and channel cell is a complicated and expensive process, which must consider the model of radio wave propagation in place the relay in question is installed.
Depending on the expected loading of the network transmit power and, consequently, the GSM cell size is controlled. Therefore, in urban areas with high population density, the cells are smaller and closer, while in areas with lower density rural areas, for example, cells serving large areas tens of square kilometers. This, just as with WiFi location makes location via GSM interesting and effective in urban in cities. GSM cells use a special channel called BCCH for transmitting identifiers of neighboring cells so that the mobile terminal can make easy passage between cells. Although power output is controlled both the GSM terminal level and at the level relay, for a variety of reasons, BCCH channel is always used the same power.
This enables mobile terminals to make consistent comparisons between the powers of the signal from multiple cells, and to choose the best communication. The same model can be used for localization. Because the basic pattern is the same, more algorithms presented in locating WiFi access point location applies to GSM, in particular algorithms that take into account signal strength.
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Although it has better stability as regards the existence relay, mass adoption of WiFi solutions for homes and offices made the density of WiFi is considerably higher than the GSM cell. On the other hand, GSM transmit cells with a much higher power, and for locating outside, not off the walls of buildings. Positioning systems for confined spaces pose problems quite different than those presented here. acceptable margins of error are generally smaller signal from GNSS systems may be weak or nonexistent. Also, positioning needs are different. If in positioning systems for exterior needed a treble which eventually can be translated then in an address where positioning systems indoor objective is to determine the position in a building at floor level, to room level or even level position in a room.
Multipath propagation of signals used in different types of location is another factor to be considered in locating indoors. Although cause problems for outdoor use indoors this problem is amplified because commonly these spaces have many obstacles in the signal may reflect several times and can reach different times and with different intensities receivers. To meet these needs have developed a series of methods and systems, many of them using similar ideas to those outlined in the previous section, tailored interior. The location is a positioning system based on terrestrial broadcasters with synchronous clocks that send signals similar to those GNSS location and do not punctual using measurements by measuring the time, but the carrier phase tracking.