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In LTE networks, ASU maps to RSRP (reference signal received power, see TS 36.133, sub-clause 9.1.4). The valid range of ASU is from 0 to 97. For the range 1 to 96, ASU maps to (ASU - 143) < dBm ≤ (ASU - 140). The value of 0 maps to RSRP below -140 dBm and the value of 97 maps to RSRP above -44 dBm.
In the U.S., the analog AMPS standard that used the cellular band (800 MHz) was replaced by a number of digital systems. Initially, systems based upon the AMPS mobile phone model were popular, including IS-95 (often known as " CDMA ", the air interface technology it uses) and IS-136 (often known as D-AMPS, Digital AMPS, or " TDMA ", the air ...
The Cellular band occupies 824–849 MHz and 869–894 MHz ranges. To issue cellular licenses, the FCC divided the U.S. into 734 geographic markets called Cellular Market Areas (CMAs) and divided the 40 MHz of spectrum into two, 20 MHz amounts referred to as channel blocks; channel block A and channel block B.
CellMapper - cellular coverage and tower map; OpenCellID - an open source project, aiming to create a complete database of Cell IDs worldwide, with their locations; cellidfinder - Find the coordinates of any known CellID. Navizon - cloud service with API to locate wireless devices using a global database of WiFi access points and Cell-ID ...
Cell towers frequently use a directional signal to improve reception in higher-traffic areas. In the United States, the Federal Communications Commission (FCC) limits omnidirectional cell tower signals to 100 watts of power. If the tower has directional antennas, the FCC allows the cell operator to emit up to 500 watts of effective radiated ...
An indoor location tracking map on a mobile phone. Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply using ...
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The unique location area identities of the cell towers can be collected by devices that utilize the wireless network provided by those cell towers. [3] This data is primarily contributed by smartphone users who have installed apps, such as OpenCelliD [4] or OpenCelliD Client, [5] and commercial tracking devices such as blackboxes, but also by wholesale data donation by corporations.