Wireless communication system, and interference preventing method

• US 8,724,655 B2
• Filed: 12/15/2010
• Issued: 05/13/2014
• Est. Priority Date: 12/25/2009
• Status: Active Grant

• Current Assignee: National Institute of Information and Communications Technology
• Original Assignee: National Institute of Information and Communications Technology
• Inventors: Sum, Chin-Sean, Harada, Hiroshi, Kojima, Fumihide, Lan, Zhou
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): SAMUEL, DEWANDA A
• Application Number:
  US13/518,978
• Publication Number:
  US 20120269130A1
• Time in Patent Office: 1,245 Days
• Field of Search: 455/41.2
• US Class Current: 370/468
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

An interference preventing method prevents communication interference between two or more wireless communication networks having mutually different physical layers, in which wireless communication is performed between a plurality of devices and a coordinator. By using a coordinator of each of the wireless communication networks, a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power. The CB of the coordinator is transmitted at least once or more for one super frame, and, in a case where the CB transmitted from the coordinator of the other wireless communication network is acquired during the scanning period, control for preventing communication interference with the other wireless communication network is performed.

Claims

1. A wireless communication system in which two or more wireless communication networks having mutually different physical layers coexist, and, in each one of the wireless communication networks, wireless communication is performed between one or more devices and a coordinator,

wherein a coordinator of each one of the wireless communication networks, before a first super frame immediately after input of power, arranges a scanning period that has a length equal to or longer than a length of the super frame for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period, transmits the coexistence notification signal of the coordinator once for one or a plurality of super frames, and in a case where the coexistence notification signal transmitted from the coordinator of the another wireless communication network is acquired during the scanning period, performs control for preventing communication interference with the another wireless communication network.

2. A wireless communication system in which two or more wireless communication networks having mutually different physical layers coexist, and, in each one of the wireless communication networks, wireless communication is performed between one or more devices and a coordinator,

wherein a coordinator of each one of the wireless communication networks, before a first super frame immediately after input of power, arranges a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period, transmits the coexistence notification signal of the coordinator once for one or a plurality of super frames, and, in a case where the coexistence notification signal transmitted from the coordinator of the another wireless communication network is acquired during the scanning period, performs control for preventing communication interference with the another wireless communication network, wherein the coexistence notification signal is transmitted based on a specification of the physical layer of frequency shifting keying (FSK), orthogonal frequency division multiplexing (OFDM), and direct sequence spread spectrum (DSSS).

3. An interference preventing method, which prevents communication interference between two or more wireless communication networks having mutually different physical layers, of a wireless communication network in which wireless communication is performed between one or more devices and a coordinator,

wherein, by using a coordinator of each one of the wireless communication networks, a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power, the scanning period having a length equal to or longer than a length of the super frame, and the coexistence notification signal of the coordinator is transmitted once for one or a plurality of super frames, and, in a case where the coexistence notification signal transmitted from the coordinator of the another wireless communication network is acquired during the scanning period, control for preventing communication interference with the another wireless communication network is performed.

4. An interference preventing method, which prevents communication interference between two or more wireless communication networks having mutually different physical layers, of a wireless communication network in which wireless communication is performed between one or more devices and a coordinator,

wherein, by using a coordinator of each one of the wireless communication networks, a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power, the coexistence notification signal of the coordinator is transmitted once for one or a plurality of super frames, and, in a case where the coexistence notification signal transmitted from the coordinator of the another wireless communication network is acquired during the scanning period, control for preventing communication interference with the another wireless communication network is performed, wherein the coexistence notification signal is transmitted based on a specification of the physical layer of frequency shifting keying (FSK), orthogonal frequency division multiplexing (OFDM), and direct sequence spread spectrum (DSSS).