Channel searching method and apparatus

a channel search and channel technology, applied in the direction of antennas, basic electric elements, electrically long antennas, etc., can solve the problems of missing an available free channel, unidirectional or sequential free channel search, and not ensuring the identification of the nearest channel by conventional unidirectional scanning approaches. to achieve the effect of improving identification

Inactive Publication Date: 2008-12-11
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]In cognitive radio, it is desired to be able to sense reliably a wide range of spectrum. By adopting bidirectional search, the searching is performed in either direction, starting at a frequency and expands through the channel search space in both directions to find the nearest free channel for transmission. While searching for a free channel, a conventional unidirectional scanning approach would miss an available free channel if it is available in the direction away from the direction of search. Thus, a unidirectional or sequential free channel search does not ensure identification of the nearest channel. By finding the nearest free channel to the current channel, the radio and transmission parameters (sampling rate, ADC, matching filter, antenna gain and sensitivity) undergo very few (in certain cases, minimal) changes during reconfiguration. In order to find a nearest free channel while scanning, a bidirectional-spiral searching algorithm enhances the identification of the nearest available free channel.

Problems solved by technology

While searching for a free channel, a conventional unidirectional scanning approach would miss an available free channel if it is available in the direction away from the direction of search.
Thus, a unidirectional or sequential free channel search does not ensure identification of the nearest channel.

Method used

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Embodiment Construction

[0032]Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, the invention will be described with reference to a specific embodiment comprising a wireless communications network 10 as illustrated in FIG. 7. The network comprises a number of wireless communications stations20, each of which is enabled to communicate on a channel defined in an available spectrum. Channels are defined in the spectrum by way of frequency. Thus, it is possible to discuss channels as being relatively higher or lower than one another with respect to frequency.

[0033]Each wireless communications station 20 is implemented in hardware of known type, as illustrated in FIG. 8. FIG. 8 illustrates the wireless communications station 20 as being implemented by means of a general purpose computer with communications facilities. In this case, communications facilities are provided by means of hardware, which is in turn configured by mean...

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Abstract

A method of identifying an available channel of a plurality of frequency channels defined in a radio frequency spectrum for use by a transmitting station, wherein scanning for an available channel in a frequency spectrum is performed by a scanning method in which a bidirectional search is performed away from an initial channel frequency. The method may include steps to take when a boundary of the spectrum is encountered, and may also take into account existing information concerning channel reservation. A related scanner and radio apparatus is also described.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is concerned with a method and apparatus for scanning a communications channel for an available channel slot for use in communication. The invention can be employed particularly, but not exclusively in cognitive radio, spectrum agile radio, 802.22 WRAN and any general channel tuning radio.[0003]The invention is generally concerned with a searching mechanism for identifying a “nearest free channel” in a dynamically varying spectrum.[0004]2. Discussion of Background[0005]In cognitive radio, spectrum agile radio or 802.22 WRAN, portions of spectrum are regularly or permanently unused by the primary target market, and are therefore available for use by a secondary market, as noted in “The Spectrum Framework Review” (OFCOM, November 2004: available at www.ofcom.org.uk / consult / condocs / sfr / sfr), “Spectrum Policy Task Force Report” (Technical Report, FCC, ET Docket 02-135, November 2004) and “Facilitating ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/04H04W16/14H04W72/02H04W72/04
CPCH04W16/14H04W72/02H04B7/26
Inventor SUBRAMANI, SIVA KUPANNAFAN, ZHONGARMOUR, SIMON MARTIN DANIELKALESHI, DRITAN
Owner KK TOSHIBA
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