Method and arrangement for locating a mobile terminal in a multicell radio arrangement
First Claim
1. A method for locating a desired mobile terminal in a multicell radio system having a plurality of radio base stations, comprising:
- sending a plurality of request messages to the plurality of radio base stations to determine a first radio base station of the plurality of radio base stations that is associated with the desired mobile terminal;
sending a command message to the first radio base station to switch the desired mobile terminal from an inactive state to an active state, the desired mobile terminal and the first radio base station being set to a first radio channel;
the desired mobile terminal receiving the command message and switching from the inactive state to the active state, when the desired mobile terminal is in the inactive state, the desired mobile terminal not transmitting and only activating a receiver of the desired mobile terminal for a first predetermined amount of time in a predetermined time span, the predetermined time span being greater than the first predetermined amount of time, when the desired mobile terminal is in the active state, the desired mobile terminal having the receiver active continuously for a second predetermined amount of time to receive data from the first radio base station, the second predetermined amount of time being defined in the command message;
determining whether the plurality of radio base stations are transmitting high priority data;
switching at least one radio base station of the plurality of radio base stations to the first radio channel if the at least one radio base station is not transmitting high priority data;
the first radio base station transmitting at least one test data message to the desired mobile terminal;
the desired mobile terminal transmitting a response message to the first radio base station in response to the at least one test data message, the response message having a field strength;
measuring the field strength of the transmitted response message; and
determining a location of the desired mobile terminal.
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0 Petitions
Accused Products
Abstract
A method and system for locating a mobile terminal in a multicell radio system are provided. A plurality of radio base stations detect the field strength of a data transmission of the mobile terminal and the location of the mobile terminal is determined the values are provided. The mobile terminal is switched into an active state, then a plurality of the radio base stations are set to the radio channel used by the mobile terminal to be located, and the mobile terminal is prompted to emit a response message as a result of the communication of a test data transmission. The received field strength of the received response message is measured by the radio base stations and communicated to a central device, after which the location of the mobile terminal is determined by the central device on the basis of the measured values.
23 Citations
20 Claims
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1. A method for locating a desired mobile terminal in a multicell radio system having a plurality of radio base stations, comprising:
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sending a plurality of request messages to the plurality of radio base stations to determine a first radio base station of the plurality of radio base stations that is associated with the desired mobile terminal; sending a command message to the first radio base station to switch the desired mobile terminal from an inactive state to an active state, the desired mobile terminal and the first radio base station being set to a first radio channel; the desired mobile terminal receiving the command message and switching from the inactive state to the active state, when the desired mobile terminal is in the inactive state, the desired mobile terminal not transmitting and only activating a receiver of the desired mobile terminal for a first predetermined amount of time in a predetermined time span, the predetermined time span being greater than the first predetermined amount of time, when the desired mobile terminal is in the active state, the desired mobile terminal having the receiver active continuously for a second predetermined amount of time to receive data from the first radio base station, the second predetermined amount of time being defined in the command message; determining whether the plurality of radio base stations are transmitting high priority data; switching at least one radio base station of the plurality of radio base stations to the first radio channel if the at least one radio base station is not transmitting high priority data; the first radio base station transmitting at least one test data message to the desired mobile terminal; the desired mobile terminal transmitting a response message to the first radio base station in response to the at least one test data message, the response message having a field strength; measuring the field strength of the transmitted response message; and determining a location of the desired mobile terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for locating a mobile terminal in a multicell radio system having a plurality of radio base stations comprising:
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switching the mobile terminal to an active state; setting a radio channel for at least a portion of the radio base stations to be the same as a radio channel used by the mobile terminal to be located; transmitting a response message from the mobile terminal in response to the mobile terminal receiving a test data message; by at least a portion of the radio base stations; measuring a received field strength of the response message which is received by the respective base station, and transmitting the field strength to a central device; and determining the location of the mobile terminal by the central device via the measured values; and wherein the radio base stations carrying out time-critical and/or high-priority data transmissions are excluded from switching of their radio channel. - View Dependent Claims (9, 10, 11)
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12. A multi-cell radio system for locating a mobile terminal, comprising:
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a central device; and a plurality of radio base stations; and the central device sending a plurality of request messages to the plurality of radio base stations and determining a first radio base station of the plurality of radio base stations that is associated with the mobile terminal; the central device sending a command message to the first radio base station to switch the mobile terminal from an inactive state to an active state; the central device determining whether any of the plurality of radio base stations are transmitting high priority data; at least one other radio base station of the plurality of radio base stations switching to a radio channel if the at least one other radio base station is not transmitting high priority data; the first radio base station transmitting the at least one test data message to the mobile terminal; the mobile terminal transmitting a response message in response to the at least one test data message, the response message having a field strength; the at least one other radio base station and the first radio base station measuring the field strength of the response message; and the central device determining a location of the mobile terminal based on the measured field strength of the response message. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification