# US 2014/0153378 A1 · Wireless communication device, wireless communication system, and channel selection method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153378 A1 - Document ID: US20140153378A1 - Status: Published application - Kind: A1 - Application number: 14/130,337 - Filed: 2011-07-08 - Published: 2014-06-05 - Earliest claimed: 2011-07-08 - Assignees: Mitsubishi Electric Corporation - Inventors: Masahiro Ishihara; Hiroaki Ushirosako; Yoshiaki Koizumi - Web page: https://patentgrep.com/patent/US20140153378A1 ## CPC - H04W 24/02: Arrangements for optimising operational condition - H04B 17/318: Received signal strength - H04W 48/20: Selecting an access point - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/542: using measured or perceived quality - H04B 17/327: Received signal code power [RSCP] - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract An electric field intensity measuring circuit measures the electric field intensity of each of multiple communication channels available for data communication. A channel determiner compares electric field intensities measured by an electric field intensity measuring circuit with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level the interference of which causes the reception sensitivity to deteriorate, counts the numbers of times that the electric field intensity exceeds the thresholds on each communication channel, and selects a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels. ## Claims ### Claim 1 A wireless communication device, comprising: an electric field intensity measurer measuring the electric field intensity of each of multiple communication channels available for data communication; and a channel determiner comparing electric field intensities measured by the electric field intensity measurer with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level, the interference of which causes the reception sensitivity to deteriorate, counting the numbers of times that the electric field intensity exceeds the thresholds on each communication channel, and selecting a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels. ### Claim 2 (depends on 1) The wireless communication device according to claim 1, wherein the channel determiner selects the communication channel with the lowest number of times of the second threshold have been exceeded as the communication channel for use among the channels in which the number of times that the first threshold has been exceeded is equal to or less than a predetermined number. ### Claim 3 (depends on 1) The wireless communication device according to claim 1, wherein the channel determiner determines the communication channel for use based on the integrated value of weighted numbers of times of the thresholds have been exceeded. ### Claim 4 (depends on 1) A wireless communication system comprising the wireless communication device according to claim 1. ### Claim 5 A channel selection method, comprising: an electric field intensity measuring step of measuring the electric field intensity of each of multiple communication channels available for data communication; and a channel determination step of comparing electric field intensities measured in the electric field intensity measuring step with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level the interference which causes the reception sensitivity to deteriorate, counting the numbers of times that the electric field intensity has exceeded the thresholds on each communication channel, and selecting a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels. ### Claim 6 (depends on 5) The channel selection method according to claim 5, wherein in the channel determination step, the communication channel with the least number of times that the second threshold has been exceeded among the channels on which the number of times that the first threshold has been exceeded is equal to or less than a predetermined number is selected as the communication channel for use. ### Claim 7 (depends on 5) The channel selection method according to claim 5, wherein in the channel determination step, the communication channel for use is determined based on the integrated value of weighted numbers of times of the thresholds have been exceeded. ### Claim 8 A non-transitory recording medium on which is recorded a program causing a computer to execute procedures of: measuring the electric field intensity of each of multiple communication channels available for data communication; and comparing electric field intensities measured in the electric field intensity measuring step with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level the interference which causes the reception sensitivity to deteriorate, counting the numbers of times that the electric field intensity has exceeded the thresholds on each communication channel, and selecting a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels.