Cognitive radio system

• US 7,917,110 B2
• Filed: 04/27/2007
• Issued: 03/29/2011
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sakata, Ren, Horiguchi, Tomoya, Yoshida, Hiroshi, Nonin, Katsuya, Tomioka, Tazuko
• Primary Examiner(s): Chang; Kent
• Assistant Examiner(s): Eisner; Ronald
• Application Number:
  US11/790,855
• Publication Number:
  US 20070253394A1
• Time in Patent Office: 1,432 Days
• Field of Search: 455/424, 455/164.1, 455/32, 455/77, 455/125, 455/145, 455/160.1, 455/150.1, 455/179.1, 455/188.1
• US Class Current: 455/164.1
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 88/14 Backbone network devices

Abstract

A cognitive radio system includes: a state detecting device that scans a frequency band allocated to another radio system than the cognitive radio system to detect a first use-state of the frequency band; a first server including a first gathering unit that receives first information relating to the first use-state and a second gathering unit; a second server that stores a second use-state of the frequency band allocated to the other radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and a notifying unit that notifies a terminal device in the cognitive radio system of information of an available channel based on the first information and the second information.

Claims

1. A cognitive radio system comprising:

a plurality of terminal devices operable to communicate with one another;

a state detecting device that scans a frequency band allocated to a first radio system to detect a first use-state of the frequency band;

a first server comprising;

a first gathering unit that receives first information relating to the first use-state from the state detecting device; and

a second gathering unit;

a second server that stores a second use-state of a frequency band allocated to a second radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and

a notifying unit that notifies a first terminal device of the plurality of terminal devices of information of an available channel to communicate with a second terminal device of the terminal devices based on a comparison of the first information and the second information;

wherein the first server calculates a reliability of received information received by the first server;

wherein the first server calculates the reliability so that the reliability is made higher as a distance between the position of the first terminal device and the position of the second terminal device is shorter; and

wherein the calculation is determined by

2. A cognitive radio system comprising:

a plurality of terminal devices operable to communicate with one another;

a state detecting device that scans a frequency band allocated to a first radio system to detect a first use-state of the frequency band;

a first server comprising;

a first gathering unit that receives first information relating to the first use-state from the state detecting device; and

a second gathering unit;

a second server that stores a second use-state of a frequency band allocated to a second radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and

a notifying unit that notifies a first terminal device of the plurality of terminal devices of information of an available channel to communicate with a second terminal device of the terminal devices based on a comparison of the first information and the second information;

wherein the first server calculates a reliability of received information received by the first server;

wherein the first server calculates the reliability so that the reliability is made higher as a distance between the position of the first terminal device and the position of the second terminal device is shorter; and

wherein the calculation is determined by