# US 2014/0157388 A1 · Wireless communication system and terminal-device authentication method in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0157388 A1 - Document ID: US20140157388A1 - Status: Published application - Kind: A1 - Application number: 14/131,008 - Filed: 2012-07-09 - Published: 2014-06-05 - Earliest claimed: 2011-07-11 - Assignees: Ricoh Company, Ltd. - Inventors: Naoki Tsumura - Web page: https://patentgrep.com/patent/US20140157388A1 ## CPC - H04W 12/06: Authentication - H04L 9/0822: {using key encryption key} - H04L 9/3228: {One-time or temporary data, i.e. information which is sent for every authentication or authorization, e.g. one-time-password, one-time-token or one-time-key} - H04L 63/0478: {applying multiple layers of encryption, e.g. nested tunnels or encrypting the content with a first key and then with at least a second key (cryptographic mechanisms or cryptographic arrangements using a plurality of keys or algorithms H04L9/14)} - H04L 63/107: {wherein the security policies are location-dependent, e.g. entities privileges depend on current location or allowing specific operations only from locally connected terminals} - H04L 2209/80: Wireless - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A wireless communication system includes code transmitters (20a, 20b) each configured to transmit a time-varying code; code receivers (30a, 30b) each configured to receive the time-varying codes transmitted from the code transmitters (20a, 20b) and generate a fingerprint based on the received time-varying codes, the fingerprint being unique to a space where the time-varying codes are receivable; and terminal devices (40a, 40b) configured to establish wireless communication connection therebetween with authentication. The terminal devices (40a, 40b) are connected to the code receivers (30a, 30b), respectively. Each terminal device (40a, 40b) includes a fingerprint acquiring unit configured to acquire the fingerprint from the code receiver (30a, 30b), a wireless communication unit configured to transmit and receive the fingerprint via wireless communication, and an authentication unit configured to authenticate another terminal device if the fingerprint received from the another terminal device matches the fingerprint acquired from the code receiver connected thereto. ## Claims ### Claim 1 A wireless communication system, comprising: a plurality of code transmitters each configured to transmit a time-varying code, the time-varying codes transmitted from the code transmitters being different from each other; a plurality of code receivers each configured to receive the time-varying codes transmitted from the code transmitters and generate a fingerprint based on the received time-varying codes, the fingerprint being unique to a space where the time-varying codes are receivable; and a plurality of terminal devices configured to establish wireless communication connection therebetween with authentication, the terminal devices being connected to the code receivers, respectively, wherein each of the terminal devices includes a fingerprint acquiring unit configured to acquire the fingerprint from the code receiver connected thereto, a wireless communication unit configured to transmit and receive the fingerprint via wireless communication, and an authentication unit configured to authenticate, as a communications partner, another one of the terminal devices if the fingerprint received by the wireless communication unit from the another one of the terminal devices matches the fingerprint acquired by the fingerprint acquiring unit from the code receiver connected thereto. ### Claim 2 (depends on 1) The wireless communication system according to claim 1, wherein each of the code transmitters includes a light source having a predetermined beam angle, and a modulating unit configured to modulate a beam emitted from the light source with the time-varying code of the each of the code transmitters, and each of the code receivers includes a photo-receiver configured to receive the beam emitted from the light source of the code transmitter, and a demodulating unit configured to demodulate an output of the photo-receiver into the time-varying code. ### Claim 3 (depends on 1) The wireless communication system according to claim 1, wherein each of the code transmitters includes a random number generator configured to generate the time-varying code based on a random number generated by the random number generator. ### Claim 4 (depends on 1) The wireless communication system according to claim 1, wherein the wireless communication is ultra wideband wireless communication carried out using a bandwidth of 500 MHz or more or a bandwidth of 20% of a center frequency or more. ### Claim 5 (depends on 2) The wireless communication system according to claim 2, wherein the light source of the code transmitter is arranged in an indoor illuminating device. ### Claim 6 (depends on 2) The wireless communication system according to claim 2, wherein the light source of the code transmitter is an indoor illuminating device. ### Claim 7 (depends on 2) The wireless communication system according to claim 2, wherein the number of the code transmitters is three or more, and the code transmitters are arranged in a manner that the beams emitted from the light sources of the code transmitters intersect. ### Claim 8 (depends on 7) The wireless communication system according to claim 7, wherein each of the code transmitters is arranged on a movable support unit. ### Claim 9 (depends on 7) The wireless communication system according to claim 7, wherein the number of the code transmitters is four, at least one of the code receivers includes four photo-receivers each configured to receive the beams emitted from the light sources of the code transmitters, respectively, and at least one of the terminal devices that mutually establish the wireless communication connection is connected to the code receiver including the four photo-receivers. ### Claim 10 A terminal-device authentication method in a wireless communication system including a plurality of terminal devices configured to establish wireless communication connection therebetween with authentication, the terminal-device authentication method comprising: transmitting, by each of the code transmitters, a time-varying code, the time-varying codes transmitted from the code transmitters being different from each other; receiving, by a plurality of code receivers connected to the terminal devices respectively, the time-varying codes transmitted from the code transmitters; generating, by each of the code receivers, fingerprint based on the received time-varying codes, the fingerprint being unique to a space where the time-varying codes are receivable; acquiring, by each of the terminal devices, the fingerprint from the code receiver connected thereto; transmitting, by each of the terminal devices, the fingerprint via wireless communication; receiving, by each of the terminal devices, the fingerprint via the wireless communication; and authenticating, as a communications partner of one of the terminal devices, another one of the terminal devices if the fingerprint received from the another one of the terminal devices matches the fingerprint acquired by the one of the terminal devices.