Method of locating mobile terminal in service area of cellular telecommunication system
A mobile terminal, telecommunication system technology, applied in satellite radio beacon positioning system, radio wave measurement system, positioning and other directions, can solve the problems of complex positioning mobile terminal, expensive logic, etc.
Inactive Publication Date: 2002-12-11
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology
Third, the mobile terminal must be modified to be able to send the information
third, additional processors must be added to the communications system to perform these functions
Second, if additional base stations are added, transmit power is changed, or any other signal fading factor changes, the above information must be updated
In this way, song also provides a very expensive and logically complex method of locating mobile terminals
Method used
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[0019] first reference figure 1 , which represents a conventional cellular radio communication system 10, and the present invention can generally be used in this type of system. exist figure 1 In , any geographical area can be divided into a plurality of contiguous wireless coverage areas, or cells C1-C10. Although figure 1 Only 10 cells are shown for illustrative purposes, and it can be clearly understood that the number of cells will be much higher in actual situations.
[0020] One of the plurality of base stations B1-B10 is associated with and located in a cell C1-C10. Each of the base stations B1-B10 includes a transmitter, receiver, and a base station controller, as is well known in the art. figure 1 Middle base stations B1-B10 are selected to be respectively located in the center of each cell of C1-C10, and omnidirectional antennas are installed. However, in other cellular radio system configurations, the base stations B1-B10 may be located near the borders, or dev...
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A mobile terminal locator for locating a mobile terminal (24) in a cellular telecommunications system (10) identifies a plurality of candidate handoff cells (22, 23) having sufficient signal strength to maintain a call, and causes the mobile terminal (24) to move from it A serving cell (21) is handed over to a plurality of candidate cells (22, 23). The locator then calculates the signal strength and propagation delay between the mobile terminal (24) and the base station. Signal strength or propagation delay, or both, are used to calculate the distance between the mobile terminal (24) and each base station associated with each candidate handover cell (22, 23), and the distance between the mobile terminal (24) and its serving Distance between base stations (21). From the calculated distances, arc-shaped areas (26, 29, 30) of possible positions of the mobile terminal can be delimited. Finally, the mobile terminal locator calculates the intersection of multiple arc-shaped areas (26, 29, 30) of possible positions to determine the position of the mobile terminal (24). The locator can operate in a serving telecommunication system with or without a synchronous clock reference signal sent by a base station.
Description
technical field [0001] The invention relates to cellular telecommunication systems, and in particular to a system and method for locating a mobile terminal in a service area of a cellular telecommunication system. Background technique [0002] In modern cellular communication systems, the service area is divided into cells, each cell being served by a base station. As mobile terminals move near the system's service area, they are handed over from one cell to another so that service is not interrupted. In an emergency, such location information would be very useful to the police or emergency teams in charge of the situation. [0003] The biggest problem with existing approaches for locating mobile terminals is that their implementation in existing cellular network structures requires high overhead and high complexity. Some solutions require major changes to the base station or other parts of the cellular communication system. Other methods require major modifications to ...
Claims
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IPC IPC(8): H04Q7/38G01S5/14G01S19/24G01S19/25G01S19/46H04B7/26H04W64/00
CPCG01S5/14H04W64/00
Inventor D·迪富尔
Owner TELEFON AB LM ERICSSON (PUBL)