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Cellular telecommunications network

A cellular network and signal technology, applied in the field of cellular communication networks, can solve the problems of inaccuracy, unreliable received signal strength, capacity loss, etc.

Inactive Publication Date: 2005-05-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is not very reliable to measure the strength of the received signal, the path loss is environment dependent and this relationship may not be very precise, and there is some loss of capacity due to beacons being sent on the downlink

Method used

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  • Cellular telecommunications network
  • Cellular telecommunications network
  • Cellular telecommunications network

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Embodiment Construction

[0048] The cellular communication network 1 comprises a plurality of base stations 4,6,7 and a plurality of positioning units 3,5. In order to locate the mobile station 2, the positioning units 3, 5 send positioning signals which the mobile station 2 can detect. The mobile station 2 can derive from the detection of the signal from the PE 3, 5 the identity of the positioning unit 3, 5 that sent the corresponding positioning signal and the time at which the mobile station 2 detects a signal or a part of a signal sent by the base station 4 detection time. This information is then sent to the main base station 4 which is in communication with the mobile station 2 . The positioning units 3, 5 are synchronized with the master base station 4 (ie they are synchronized with the downlink transmissions of the serving base station) and thus know the time at which the positioning signal was sent. By calculating the time it takes for the transmission signal to travel between the location ...

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Abstract

The cellular communication network 1 comprises a plurality of base stations 4 , 6 , 7 and a plurality of positioning units 3 , 5 . In order to locate the mobile station 2, the positioning units 3, 5 send positioning signals which the mobile station 2 can detect. By detecting the arrival time of the positioning signal, the network (1) can determine the position of the mobile station 2.

Description

technical field [0001] The present invention relates to cellular communication networks and in particular it proposes a method of locating a mobile station (MS) communicating with such a network. The invention is particularly applicable to cellular communication networks operating according to the Code Division Multiple Access (CDMA) protocol. In some of these systems, all base transceiver stations (BTSs) transmit to all MSs in the same portion of the radio spectrum called the downlink, while all MSs transmit in a different portion of the radio frequency spectrum called the uplink sent within. Background technique [0002] There is a requirement in such systems that the network should be able to locate (ie determine the location of such MSs) MSs operating within the network. To achieve this goal it has recently been proposed that a mobile station detect signals transmitted by at least two geographically separated base stations in addition to the main base station with whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/38H04W64/00
CPCH04W64/00
Inventor M·卡萨皮迪斯
Owner PANASONIC CORP