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Smart antenna for interference rejection with enhanced tracking




Title: Smart antenna for interference rejection with enhanced tracking.
Abstract: A smart antenna system is provided for communicating wireless signals between a mobile device and a plurality of different fixed base stations using one or more channels and one or more beams. The smart antenna system includes a control subsystem, a radio transceiver and an antenna subsystem coupled to each other and adapted to perform scanning of one or more combinations of base stations, channels and beams using one or more test links established with one or more of the fixed base stations where the test links use at least some of the channels and the beams. A first combination of base station, channel and beam is selected based on the scanning; and a first operating link is established for transmitting a wireless signal to the selected base station using the selected channel and beam. ...


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USPTO Applicaton #: #20140099946
Inventors: Octavian Sarca, Serban Cretu, Aurel Picu


The Patent Description & Claims data below is from USPTO Patent Application 20140099946, Smart antenna for interference rejection with enhanced tracking.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims priority to U.S. application Ser. No. 13/899,787, filed May 22, 2013, which is a continuation of Ser. No. 13/682,540, filed Nov. 20, 2012, now allowed, which is a continuation-in-part of U.S. application Ser. No. 13/644,852, filed Oct. 4, 2012, now allowed, the entire contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

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This invention is directed towards antenna systems for mobile devices.

BACKGROUND

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OF THE INVENTION

Wireless communication is extensively used in mobile or nomadic applications.

In a typical mobile/nomadic application, a mobile or nomadic wireless device or mobile station will try to establish a link with a fixed base station, so as to transmit information to the base station. To achieve coverage of the desired area, multiple base-stations must be used. FIG. 1 shows an example of a system used to support a mobile application. Mobile station 111 will try to establish a link with one of base stations 121 and 122, as it travels along path 131.

Typical solutions for mobile or nomadic wireless devices use omnidirectional antennas that are isotropic or have similar properties, for example gain, in all directions of interest.

While mobile/nomadic devices use omnidirectional antennas, strict separation between base-stations covering adjacent areas is required to avoid harmful self-interference. Separation can be achieved through: Time, that is, the base stations do not transmit and receive at the same time, Frequency, that is, the base stations transmit and receive on different frequencies, or Code, that is, the base stations transmit and receive using different codes.

All these methods reduce the total system capacity.

FIG. 2 shows an example of the coverage 403 for base-station 401 and the coverage 404 for the base-station 402 when both base-stations use the same frequency channel, and the three mobile/nomadic devices 406, 407 and 408 use omnidirectional antennas. This assumes there are no other time or code methods used to reduce interference between the two base-stations 401 and 402. As can be seen, much of the area of interest 405 is not adequately covered. Mobile device 406 receives coverage, that is, it can establish an operating link with better than threshold signal quality from base station 401 in area 403. Similarly mobile device 407 receives coverage from base station 402 in area 404. However, mobile device 408 cannot receive coverage from either base station 401 or 402 because the signal quality is not good enough. This is because the omnidirectional antenna captures signals from the two base-stations 401 and 402 and needs to be very close to one of them and very far from the other to obtain the needed signal quality.

In order to solve the problem shown in FIG. 2, there is a need for a system that has omnidirectional coverage, but is able to focus on one sector so as to optimize signal quality to enable communications with the highest reliability. Until now, systems have focused on optimizing signal strength, which may not result in enabling communications with the highest reliability.

SUMMARY

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OF THE INVENTION

In accordance with one embodiment, a smart antenna system for communicating wireless signals between a mobile device and a plurality of fixed base stations using one or more channels and one or more beams, said smart antenna system comprising a control subsystem, a radio transceiver and an antenna subsystem coupled to each other and adapted to perform scanning of one or more combinations of base stations, channels and beams using one or more test links established with one or more of the fixed base stations and the test links use at least some of the channels and the beams. A first combination of base station, channel and beam is selected based on data obtained during scanning, and a first operating link is established for transmitting a wireless signal to the currently selected base station using the currently selected channel and beam. After establishment of the first operating link, scanning is continued using one or more test links established with the currently selected base station, using one or more beams different from the currently selected beam and the currently selected channel, or with one or more combinations of base stations, channels and beams. The continued scanning is performed aperiodically, and the interval between consecutive continued scanning operations is pseudo-random.

In one implementation, before the continued scanning is performed, said control subsystem inserts a downtime and the continued scanning is performed during the downtime.

In one implementation, the control subsystem calculates the duration of the downtime before inserting the downtime.

BRIEF DESCRIPTION OF THE DRAWINGS

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The invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings.

FIG. 1 shows an example of a system used to support a mobile application.

FIG. 2 shows example coverage of a given area for a mobile/nomadic device or station with an omnidirectional antenna.

FIG. 3 shows a smart antenna system.

FIG. 4 shows a radiation pattern for beam 200.

FIG. 5 shows an example radiation pattern for arrangement 300.




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stats Patent Info
Application #
US 20140099946 A1
Publish Date
04/10/2014
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


Base Station Rejection Antenna Transceiver Wireless G Link Smart Antenna

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Redline Communications Inc.


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Telecommunications   Radiotelephone System   Zoned Or Cellular Telephone System   Control Or Access Channel Scanning  

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20140410|20140099946|smart antenna for interference rejection with enhanced tracking|A smart antenna system is provided for communicating wireless signals between a mobile device and a plurality of different fixed base stations using one or more channels and one or more beams. The smart antenna system includes a control subsystem, a radio transceiver and an antenna subsystem coupled to each |Redline-Communications-Inc