Localization of a mobile device in distributed antenna communications system
First Claim
1. A method for locating a mobile communications device in a distributed antenna system in which plural distributed antennas are communicatively coupled to a hub and in which the mobile device is communicatively coupled to the hub via one or more of the antennas, the method comprising:
- receiving a message at the hub that identifies the mobile device to be located;
discriminating among communications signals received from each of the distributed antennas using a channel and a spreading code to identify a signal from the mobile device; and
determining which of the antennas is closest to the mobile device to be located by monitoring received signal strength of the identified signal.
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Abstract
The present invention provides a method and apparatus for localization of a mobile device in a distributed antenna communications system. In accordance with an embodiment of the invention, a distributed antenna system includes a plurality of distributed antennas that are communicatively coupled to a hub. A mobile communications device to be located is communicatively coupled to the hub via one or more of the antennas. The method for locating the mobile device comprises: receiving a message at the hub that identifies the mobile device to be located; discriminating among communications signals received from each of the distributed antennas using a channel and a spreading code to identify a signal from the mobile device; identifying messages from the mobile device to be located; and determining which of the antennas is closest to the mobile device to be located by monitoring received signal strength of the identified signal.
144 Citations
28 Claims
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1. A method for locating a mobile communications device in a distributed antenna system in which plural distributed antennas are communicatively coupled to a hub and in which the mobile device is communicatively coupled to the hub via one or more of the antennas, the method comprising:
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receiving a message at the hub that identifies the mobile device to be located; discriminating among communications signals received from each of the distributed antennas using a channel and a spreading code to identify a signal from the mobile device; and determining which of the antennas is closest to the mobile device to be located by monitoring received signal strength of the identified signal. - View Dependent Claims (7, 8, 9, 10, 13, 14, 15, 16)
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2. The method according to claim 1, wherein the mobile device communicates using a CDMA protocol for cellular communications.
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11. A distributed antenna system comprising:
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a base station configured for communication with a telecommunications network; a multi-port hub connected to the base station that receives communication signals from a plurality of ports of the multi-port hub and combines the received communication signals for forwarding a combined signal to the base station, wherein the multi-port hub comprises; a de-spreader that uses a spreading code to identify a signal from a mobile communications device to be located; and a controller that determines which of the antennas is closest to the mobile device to be located by monitoring received signal strength of the identified signal.
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12. A method for locating a mobile device in a distributed antenna system in which plural distributed antennas are communicatively coupled to a hub and in which the mobile device is communicatively coupled to the hub via one or more of the antennas, the method comprising:
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receiving an indication at the hub that notifies the hub of commencement of locating the mobile device; instructing the mobile device to modulate its output power; identifying a received signal from the mobile device having modulated output power; and identifying a particular antenna unit among the plurality having a highest received power level from the mobile device.
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17. The method according to claim 9, wherein the notification is sent from an emitter associated with the antenna determined to be closest via a wireless personal area network.
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17-1. A distributed antenna system comprising:
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a base station configured for communication with a telecommunications network; and a multi-port hub connected to the base station that receives communication signals from a plurality of ports of the multi-port repeater hub and combines the received communication signals for forwarding a combined signal to the base station, wherein the multi-port hub determines which of the antennas is closest to a mobile device to be located by the base station instructing the mobile device to modulate its output power, the hub identifying a received signal from the mobile device by its modulated output power, and identifying a particular antenna unit among the plurality having a highest received power level from the mobile device.
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- 18. The method according to claim 9, wherein the notification is sent from an emitter associated with the antenna determined to be closest in the form of a human perceptible signal.
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18-2. A method for locating a mobile communications device in a distributed antenna system in which plural distributed antennas are communicatively coupled to a hub and in which the mobile device is communicatively coupled to the hub via one or more of the antennas, the method comprising:
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receiving a message at the hub that identifies the mobile device to be located; identifying a received signal from the mobile device in a frequency channel and timeslot of the mobile device; and determining which of the antennas is closest to the mobile device to be located by monitoring received signal strength of the identified signal.
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19-3. The method according to claim 18, wherein the mobile device communicates using a TDMA protocol for cellular communications.
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20-4. The method according to claim 18, wherein the message identifies the mobile device according to its frequency channel and timeslot.
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21-5. The method according to claim 18, further comprising sending a notification of the location of the antenna determined to be closest to the mobile device for facilitating locating the mobile device.
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22-6. The method according to claim 18, wherein the notification is sent from an emitter associated with the antenna determined to be closest via a wireless personal area network.
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28. A distributed antenna system comprising:
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a base station configured for communication with a telecommunications network; and a multi-port hub connected to the base station that receives communication signals from a plurality of ports of the multi-port repeater hub and combines the received communication signals for forwarding a combined signal to the base station, wherein the multi-port hub determines which of the antennas is closest to a mobile device to be located by identifying a received signal from the mobile device by its frequency channel and timeslot, and identifying a particular antenna unit among the plurality having a highest received power level from the mobile device.
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Specification