subways, basements, indoor, suburban, road, etc., is also a headache. Traditionally, due to the limitations of technology and equipment, operators and network design departments often use the common base station plus repeater to solve these problems. The disadvantage of this approach is that it will bring about increased interference, high drop rate, maintenance difficulties and so on. How to use a technic
Today's wireless users have no end-to-end requirements for higher capacity, faster access speeds, and higher data throughput capabilities, leading to the increasing radio signal bandwidth of cell base stations. As far as the network is concerned, brutal competition and declining profits have forced base station manufac
cell or region. Therefore, the application of the positioning accuracy requirements of the business, such as roaming user greeting service, remote design services, Ping An messenger and cargo tracking. At present, the domestic provinces and regions of the mobile company SMS Welcome system is the use of this technology.
The 3.toa/tdoa positioning TOA (time of arrival, arrival times), TDOA (timing difference of arrival, the time difference of arrival) are based on the method of
, mobile companies in various provinces and regions in China use this technology in their text message welcome systems.
3. TOA/TDOA Location TOA (Time of Arrival, Arrival Time) and TDOA (Time Difference of Arrival, Arrival Time Difference) are all based on the Time of radio wave propagation. At the same time, it is also a three-base station positioning method. B
. There are two ways to obtain cellid and lac in Windows Mobile: sending AT commands via serial port or using RIL. RIL (radio interface layer) is a library developed by Microsoft. Its program has inherent characteristics. In obtaining cellid, it is actually an encapsulation of the first method, the two are essentially the same. Note that once the serial port is enabled, it is difficult to close it unless you restart the machine (which may involve unde
LBS Base Station positioning (location Based service, lbs) is generally used in mobile phone users, it is based on the position of the service, through telecommunications, mobile operators of radio communication networks (such as GSM network, CDMA network) or external positioning methods (such as GPS) Get location information (geographic coordinates, or geodetic
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