Receiving method and receiving device

Abstract

The present invention provides a receiving method and a receiving device. The receiving method comprises: receiving an optical signal sent from an optical transmitting device at a terminal; demodulating the optical signal to obtain first data, the first data including an identifier of a wireless transmitting device and a location identifier of the optical transmitting device; receiving a wireless signal from the wireless transmitting device at a terminal; and demodulating the wireless signal to obtain second data, the second data including map data, the map data including the location identifier of the optical transmitting device.

Description

[0001] This application is a divisional of an invention patent application with an application date of October 10, 2017, application number 201780062345.1, and invention name “Transmitting device and method, receiving device and method, communication system and communication method”. Technical Field

[0002] The present invention relates to a sending device, a receiving device, a communication system, a sending method, a receiving method and a communication method. Background Art

[0003] As a method for a device to obtain location information, there is a method using GPS (Global Positioning System), in which the device receives a modulated signal sent from a satellite and performs positioning calculations to estimate the location. However, if the device is indoors where it is difficult to receive radio waves sent by GPS satellites, it is difficult to estimate the location information.

[0004] As a method for solving this problem, there is a method disclosed in, for example, Non-Patent Document 1. In the method disclosed in Non-Patent Document 1, a device estimates a location using radio waves transmitted from an access point of a wireless LAN (Local Area Network).

[0005] (Prior art literature)

[0006] (Non-patent literature)

[0007] Non-patent literature 1 Santosh Pandey, "NGP Use Case Template" IEEE802.11-16 / 0137r4, 2016-03-12 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, further improvement in performance of transmitting devices and receiving devices is desired.

[0010] Means used to solve the problem

[0011] A receiving method involved in one form of the present application includes: receiving an optical signal sent from an optical transmitting device at a terminal; demodulating the optical signal to obtain first data, the first data including an identifier of a wireless transmitting device and a location identifier of the optical transmitting device; receiving a wireless signal from the wireless transmitting device at the terminal; and demodulating the wireless signal to obtain second data, the second data including map data, the map data including the location identifier of the optical transmitting device.

[0012] Effects of the Invention

[0013] Through the present application, it is possible to improve the performance of communication devices and receiving devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An example of the configuration of the device and the terminal in Embodiment 1 is shown.

[0015] Figure 2 An example of a frame format of a modulated signal transmitted by the first device in Implementation Example 1 is shown.

[0016] Figure 3 An example in which a plurality of devices exist in Embodiment 2 is shown.

[0017] Figure 4 An example of the configuration of the device and the terminal in the third embodiment is shown.

[0018] Figure 5 A specific display example of the display unit in Embodiment 3 is shown.

[0019] Figure 6 An example of a frame format of a modulated signal transmitted by the first device in the third embodiment is shown.

[0020] Figure 7 An example of a frame format of a modulated signal transmitted by a base station in Embodiments 3 to 6 is shown.

[0021] Figure 8 This is a flowchart showing an example of processing executed by a device, a terminal, and a base station in Implementation Example 3.

[0022] Fig. 9 An example of a map in Embodiment 3 is shown.

[0023] Fig.10 An example of the configuration of a communication system in Embodiment 4 is shown.

[0024] Fig.11 An example of a frame format of a modulated signal transmitted by the second device in Implementation 4 is shown.

[0025] Fig.12 An example of a frame format of a modulated signal transmitted by a wireless device included in a terminal in Embodiment 4 is shown.

[0026] Fig.13 This is a flowchart showing an example of processing performed by a device, a terminal, and a base station in Implementation Example 4.

[0027] Fig.14An example of the configuration of a device, a terminal, and a base station in Embodiment 5 is shown.

[0028] Fig.15 An example of a frame format of a modulated signal transmitted by the third device in Implementation 5 is shown.

[0029] Fig.16 An example of a frame format of a modulated signal transmitted by the fourth device in Implementation 5 is shown.

[0030] Fig.17 This is a flowchart showing a first example of processing executed by the third device, the fourth device, the terminal, and the base station in the fifth embodiment.

[0031] Fig.18 This is a flowchart showing a second example of the processing executed by the third device, the fourth device, the terminal, and the base station in the fifth embodiment.

[0032] Fig.19 An example of a space in which the third device, the fourth device, the terminal, and the base station in Embodiment 5 are arranged is shown.

[0033] Fig. 20 An example of the configuration of a communication system in Embodiment 6 is shown.

[0034] Fig.21 This is a flowchart showing an example of processing performed by a portion related to LEDs, etc., a terminal, and a wireless device of a base station in Embodiment 6.

[0035] Fig. 22 An example of the configuration of a communication system in Embodiment 7 is shown.

[0036] Fig.23 An example of a frame format of a modulated signal transmitted by the device in Embodiment 7 is shown.

[0037] Fig.24 An example of another frame format of a modulated signal transmitted by the device in Embodiment 7 is shown.

[0038] Fig.25 An example of another frame format of a modulated signal transmitted by the device in Embodiment 7 is shown.

[0039] Fig.26 An example of a sending method performed by the device in Implementation Example 7 is shown.

[0040] Fig. 27 An example of an area in which devices and base stations in Embodiment 7 are arranged is shown.

[0041] Fig.28This is a flowchart showing an example of processing performed by the device, terminal, and base station in Implementation Example 7.

[0042] Fig.29 An example of a vehicle including a light source is shown.

[0043] Fig.30 An example of a vehicle including a light receiving unit is shown.

[0044] Fig.31 Other examples of communication methods are shown.

[0045] Fig.32 An example of line scan sampling is shown.

[0046] Fig.33 An example of a captured image in which no stripe pattern appears is shown.

[0047] Fig.34 An example of a captured image in which a stripe pattern appears is shown.

[0048] Fig.35A An example of a 4 PPM modulation method is shown.

[0049] Fig.35B An example of Manchester encoding is shown. DETAILED DESCRIPTION

[0050] (Insights that form the basis of this application)

[0051] One method for a device to obtain location information is to use GPS (Global Positioning System), where the device receives a modulated signal sent from a satellite and performs positioning calculations to estimate the location. However, if the device is indoors where it is difficult to receive radio waves sent from GPS satellites, it becomes difficult to estimate location information.

[0052] As a method for solving this problem, there is a method disclosed in non-patent document 1, for example. As shown in non-patent document 1, a device estimates a location using radio waves sent from an access point of a wireless LAN (Local Area Network). However, since it is not easy to know the SSID (service set identifier) ​​of an access point that can be safely accessed, when a device wants to obtain location information, there is a possibility that it will connect to an access point with an unsafe SSID, which may cause information leakage.

[0053] Therefore, in the present application, for example, a (light) modulated signal including information related to a place is sent from a lighting device using visible light such as an LED (Light Emitting Diode), or a light source, or a lamp installed indoors. The terminal (device) receives the (light) modulated signal through an image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) or a CMOS (organic CMOS) using an organic thin film (OPF: Organic Photoconductive Film), performs demodulation and other processing, and thereby obtains at least information related to the place. Accordingly, the effect that the terminal can securely obtain information related to the place can be obtained.

[0054] Alternatively, in the present application, for example, a (light) modulated signal including information related to the SSID is transmitted from a visible light illumination such as an LED (Light Emitting Diode) or a light source or a lamp installed indoors. The terminal (device) receives the (light) modulated signal through an image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) or a CMOS (organic CMOS) using an organic thin film (OPF: Organic Photoconductive Film), and performs processing such as demodulation to obtain at least information related to the SSID. In this way, the terminal can be securely connected to the access point.

[0055] (Implementation Method 1)

[0056] Figure 1 An example of the configuration of the device 100 and the terminal 150 in this embodiment is shown, and the device 100, for example, has a light source of visible light such as an LED (Light Emitting Diode), or lighting, or a lamp. The device 100 has a lighting, light source, or lamp using visible light such as an LED (Light Emitting Diode). In addition, the device is named "first device".

[0057] The transmitting unit 102 receives, for example, information about a place or information about a position 101 as input. Furthermore, the transmitting unit 102 may receive information about a time 105 as input. Furthermore, the transmitting unit 102 may receive both information about a place or information about a position 101 and information about a time 105 as input.

[0058] The transmitter 102 receives information about a place or position 101 and / or information about a time 105 as input, generates a (light) modulated signal based on these input signals, and outputs a modulated signal 103. The modulated signal 103 is transmitted from a light source 104, for example.

[0059] Here, an example of the information 101 related to a place or a position will be described.

[0060] Example 1:

[0061] The information 101 related to a place or location may be information on the latitude and / or longitude of the place or location. For example, the information "45 degrees north latitude, 135 degrees east longitude" may be used as the information 101 related to a place or location.

[0062] Example 2:

[0063] The information on a place or the information on a position 101 may be information on an address. For example, the information on a place or the information on a position 101 may be “1-1-1, ○○-cho, Chiyoda-ku, Tokyo”.

[0064] Example 3:

[0065] The information on a place or the information on a position 101 may be information on a building, a facility, etc. For example, the information on "Tokyo Tower" may be used as the information on a place or the information on a position 101 .

[0066] Example 4:

[0067] The information on a place or the information on a position 101 may be information on a specific place or position such as an installed building or facility.

[0068] For example, if there is a parking lot, it is assumed that the parking spaces are large enough for 5 cars. In this case, the first parking space is named A-1, the second parking space is named A-2, the third parking space is named A-3, the fourth parking space is named A-4, and the fifth parking space is named A-5. Therefore, for example, the information "A-3" can be used as the information related to the place or the information related to the position 101.

[0069] Such examples are not limited to parking lot situations.

[0070] For example, information related to “areas, seats, stores, facilities, etc.” in concert facilities, baseball, football, tennis and other stadiums, airplanes, airport lounges, railways, stations, etc. may be used as place-related information or location-related information 101 .

[0071] In addition, the method of configuring the information on a place or the information on a position 101 is not limited to the above-mentioned example.

[0072] The terminal 150 receives the modulated signal transmitted by the first device 100 .

[0073] The light receiving unit 151 is, for example, an image sensor such as a CMOS or an organic CMOS. The light receiving unit 151 receives light including a modulated signal output from the first device, and outputs a received signal 152. Then, the receiving unit 153 receives the received signal 152 as input, demodulates the modulated signal included in the received signal, performs error correction decoding and other processing, and outputs received data 154.

[0074] In addition, the received signal 152 output from the light receiving unit 151 may be a signal including information of an image or a moving image obtained by an image sensor, or may be an output signal of another element that performs photoelectric conversion (converts light into an electrical signal). In the following description, when there is no special description of the processing performed on the light receiving unit 151 and it is recorded as the receiving device receiving a modulated signal, it means that the receiving device is the light receiving unit 151, and by performing photoelectric conversion (converting light into an electrical signal) based on light containing the modulated signal, "a signal of an image or a moving image" and "a modulated signal for transmitting information" are obtained. However, the above method is an example of a method for a receiving device to receive a modulated signal, and the method for receiving a modulated signal is not limited thereto.

[0075] The data analysis unit 155 receives the received data 154 as input, estimates the location or position of the terminal 150 based on the received data 154 , for example, and outputs information 156 including at least the location or position information of the terminal 150 .

[0076] Display unit 157 receives information 156 as input, and displays information related to the location or position of terminal 150 on display unit 157 based on the location or position information of terminal 150 included in information 156 .

[0077] Figure 2 FIG. 2 shows an example of a frame format of a modulated signal transmitted by the first device 100. Figure 2 The horizontal axis represents time. For example, the first device transmits a preamble 201, and then transmits a control information symbol 202, a symbol 203 related to location information or position information, and a symbol 204 related to time information.

[0078] At this time, the preamble 201 is regarded as a symbol used by the terminal 150 receiving the modulated signal transmitted by the first device 100 to perform, for example, signal detection, time synchronization, frame synchronization, and the like.

[0079] The control information symbol 202 is considered to be a symbol including data such as a modulation signal configuration method, an error correction coding method used, and a frame format method, for example.

[0080] The code element 203 related to the location information or position information is, including Figure 1 The code elements of the place-related information or the location-related information are shown.

[0081] Therefore, the frame may also include symbols other than symbols 201, 202, and 203. For example Figure 2 As shown in FIG. 1 , the code element 204 related to the time information may also be included. The code element 204 related to the time information is regarded as a code element including information on the time when the first device sends the modulated signal. In addition, the frame format of the modulated signal sent by the first device is not subject to Figure 2 The code elements contained in the modulated signal are not limited by Figure 2 is limited by its composition (it may also include code elements with other data or information).

[0082] like Figure 1 , Figure 2 As shown, the effect when the first device sends a modulated signal and the terminal receives the modulated signal is explained.

[0083] Since the first device transmits a modulated signal through visible light, the location of the terminal that can receive the modulated signal is not far from the location of the first device. Therefore, the terminal can obtain the location or position information transmitted by the first device, thereby achieving an effect that the terminal can simply obtain highly accurate position information (without having to perform complex signal processing). Furthermore, when the first device is set in a location where it is difficult to receive radio waves from GPS satellites, even in a location where it is difficult to receive radio waves from GPS satellites, the terminal can safely obtain highly accurate position information by receiving the modulated signal transmitted by the first device.

[0084] (Implementation Method 2)

[0085] In this embodiment, an embodiment is described in which a plurality of first devices described in Embodiment 1 exist.

[0086] In this embodiment, if Figure 3 As shown, with Figure 1 The 1-1 device 301-1 having the same structure as the first device 100 transmits a modulated signal, which is received by the terminal 302. The terminal 302 receives the modulated signal transmitted by the 1-1 device 301-1, and obtains information about the 1-1 place or position, and information about the 1-1 time.

[0087] Similarly, with Figure 1The 1-2 device 301-2 having the same structure as the 1-2 device 100 transmits a modulated signal, which is received by the terminal 302. The terminal 302 receives the modulated signal transmitted by the 1-2 device 301-2, and obtains information related to the 1-2 place or position, and information related to the 1-2 time, for example.

[0088] Therefore, the terminal 302 can know the information about the 1-1 place or position and the information about the 1-2 place or position. Figure 3 Therefore, the terminal 302 can know the distance between the terminal 302 and the 1-1 device 301-1 according to the information related to the 1-1 moment, for example, according to the moment when the terminal receives the modulated signal sent by the 1-1 device 301-1. Similarly, the terminal 302 can know the distance between the terminal 302 and the 1-2 device 301-2 according to the information related to the 1-2 moment, for example, according to the moment when the terminal 302 receives the modulated signal sent by the 1-2 device 301-2.

[0089] Therefore, the terminal 302 knows the location of the 1-1 device based on the information related to the 1-1 place or position. The terminal 302 knows the location of the 1-2 device based on the information related to the 1-2 place or position. The terminal 302 knows the "triangle formed by the 1-1 device 301-1, the 1-2 device 301-2 and the terminal 302" based on the "distance between the 1-1 device 301-1 and the 1-2 device 301-2", "the distance between the 1-1 device 301-1 and the terminal", and "the distance between the 1-2 device 301-2 and the terminal".

[0090] However, the terminal 302 can calculate and obtain the position of the terminal 302 with high accuracy based on "the position of the 1-1 device", "the position of the 1-2 device", and "the triangle formed by the 1-1 device 301-1, the 1-2 device 301-2, and the terminal 302".

[0091] However, the land surveying method used by the terminal 302 to obtain the location or position information is not limited to the above description, and any surveying method is acceptable. For example, examples of land surveying methods include triangulation, multi-angle measurement, trilateral measurement, leveling, and the like.

[0092] As described above, the terminal obtains the above information from multiple devices with light sources that transmit location information, thereby achieving the effect that the terminal can estimate the location with high accuracy. Therefore, as shown in the description of Implementation 1, when the device with a light source that transmits location information is set in a place where it is difficult to receive radio waves from GPS satellites, even in a place where it is difficult to receive radio waves from GPS satellites, the terminal can safely obtain highly accurate location information by receiving the modulated signal sent by the device.

[0093] In addition, in the above example, the terminal receives the modulated signals sent by two devices as an example, but the same can be implemented even if the terminal receives the modulated signals sent by more than two devices. In addition, the more devices there are, the more advantages the terminal has in being able to calculate highly accurate location information.

[0094] (Implementation 3)

[0095] Figure 4 An example of the configuration of a device including a light source of visible light such as an LED, or lighting, or a lamp, and a terminal, and a base station for communicating with the terminal in this embodiment is shown. Figure 4 The device 400 has a lighting device or a light source or a lamp using visible light such as an LED. In addition, the device is named "first device". Figure 4 In the first device 400, for Figure 1 The same operations as the first device 100 are assigned the same reference numerals.

[0096] Figure 4 The terminal 450 shows the structure of the terminal. Figure 1 The same actions are given the same number.

[0097] exist Figure 4 In the first device 400, the sending unit 102 receives, for example, information 101 related to a location or position, information 401-1 related to an SSID (service set identifier), and information 401-2 related to an access destination as input. Furthermore, the sending unit 102 may also receive information 105 related to a time as input.

[0098] The transmitting unit 102 receives information about a location or position 101, information about an SSID 401-1, information about an access destination 401-2, and / or information about a time 105 as input, generates a (light) modulated signal based on these input signals, and outputs a modulated signal 103. Thus, the modulated signal 103 is transmitted from, for example, a light source 104.

[0099] In addition, since examples of the information on places or the information on positions 101 have been described in Embodiment 1, description thereof will be omitted here.

[0100] Next, the information 401 - 1 on the SSID and the information 401 - 2 on the access destination will be described.

[0101] First, the information 401 - 1 related to the SSID will be described.

[0102] The information 401-1 related to the SSID is Figure 4 Here, if it is determined that the SSID notified by the optical signal is the SSID of a secure base station, the first device 400 can provide the terminal 450 with access to the base station 470, which is a secure access destination. Figure 4 The terminal 450 can securely obtain information through the base station (or AP) 470. In addition, the first device 400 can limit the terminals accessing the base station 470 to terminals in a space that can receive the optical signal transmitted (radiated) by the first device 400.

[0103] In addition, when the terminal 450 receives an optical signal sent in a predetermined manner, it can be determined whether the notified SSID is the SSID of a secure base station, or it can be determined whether it is secure. For example, the first device 400 includes a specified identifier in the optical signal and sends it, and the terminal determines whether the SSID notified based on the received identifier is the SSID of a secure base station. In addition, the terminal 450 may not perform the determination process of whether it is a secure base station, but may use the characteristics of visible light to select the first device 400 with high user security, receive the optical signal from the first device 400 at the terminal 450, and obtain the SSID of the base station with high security.

[0104] In addition, Figure 4 Although only base station (or AP) 470 is shown in FIG. 1 , for example, in the case where there are base stations (or APs) other than base station (or AP) 470, Figure 4 The terminal 450 can also access the base station (or AP) 470 to obtain information.

[0105] Information 401-2 about the access destination is in Figure 4 After the terminal 450 accesses the base station (or AP) 470, the information related to the access destination is obtained. (In addition, the specific operation example will be described later.)

[0106] Figure 4 The terminal 450 receives the modulated signal sent by the first device 400. Figure 4 Terminal 450, for Figure 1 The same actions of terminal 150 are given the same labels.

[0107] The light receiving unit 151 such as an image sensor such as CMOS or organic CMOS provided in the terminal 450 receives the modulated signal transmitted by the first device 400. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0108] The data analysis unit 155 receives the received data 154 as input, estimates the location or position of the terminal based on the received data 154, and outputs information 156 including at least the location or position information of the terminal, information 451 related to the SSID, and information 452 related to the access destination.

[0109] The display unit 157 receives information 156 including the location or position information of the terminal, information 451 related to the SSID, and information 452 related to the access destination as input, and displays, for example, the location or position of the terminal, the SSID of the communication partner to be accessed by the wireless device 453 of the terminal 450, and the access destination. (This display is named the first display)

[0110] For example, after the first display, Figure 4 The wireless device 453 of the terminal 450 receives the information 451 about the SSID and the information 452 about the access destination as input. Figure 4 The wireless device 453 of the terminal 450 is connected to the communication partner using, for example, radio waves, based on the information 451 related to the SSID. Figure 4 In this case, it becomes Figure 4 The wireless device 453 of the terminal 450 is connected to the base station 470.

[0111] then, Figure 4 The wireless device 453 of the terminal 450 generates a modulated signal from data including the information on the access destination based on the information 452 on the access destination, and transmits the modulated signal to the base station 470 using, for example, radio waves.

[0112] Figure 4 The communication partner of the terminal is the base station (or AP) 470, receiving Figure 4The base station (or AP) 470 then performs demodulation, error correction decoding, and other processing on the received modulated signal, and outputs a signal including Figure 4 The base station (or AP) 470 receives data 471 of the access destination information sent by the terminal 450. Based on the access destination information, the base station (or AP) 470 obtains the desired information 472, for example, from the access destination while accessing the desired access destination via the network.

[0113] Then, the base station 470 takes the desired information 472 as input, generates a modulated signal according to the desired information 472, and transmits the modulated signal to the base station 470 using radio waves. Figure 4 The terminal 450 sends.

[0114] Figure 4 The wireless device 453 of the terminal 450 receives the modulated signal sent by the base station 470, performs demodulation, error correction decoding and other processing to obtain the desired information 472.

[0115] For example, the desired information 472 is a map, a map and floor guide of a building, a map and floor guide of a facility, a map and floor guide of a parking lot, information on "areas, seats, stores, facilities" in concert facilities, stadiums, airplanes, airport lounges, railways, stations, etc.

[0116] The display unit 157 receives the desired information 472, the information 156 including at least the location or position information of the terminal, and the information 451 related to the SSID as input, and after the first display, maps the location of the terminal to a map, a floor guide, facility information, seat information, and store information for display based on the desired information 472 and the information 156 including at least the location or position information of the terminal.

[0117] A specific example in this case is shown. Figure 5 is a specific display example of the display unit 157. Figure 5 The display shows the "3rd floor plan". Also, A-1, A-2, A-3, A-4, A-21, A-22, A-23, and A-24 are set to indicate parking spaces for vehicles. Also, B-1 and B-2 are set to indicate the locations of elevators. The information on the map is set to the desired information 472. Then, as Figure 5 As shown, the current position is mapped on a map and displayed. At this time, the current position is information obtained based on information 156 including at least the location or position information of the terminal.

[0118] Figure 6 Shows Figure 4 An example of a frame format of a modulated signal transmitted by the first device 400. Figure 6 In the figure, the horizontal axis is time, and for transmission and Figure 2 The same information code elements are given the same reference numerals and their descriptions are omitted.

[0119] The first device 400 transmits a symbol 600-1 related to the SSID and a symbol 600-2 related to the access destination in addition to the preamble 201, the control information symbol 202, the symbol 203 related to the location information or the position information, and the symbol 204 related to the time information.

[0120] In addition, the code element 600-1 related to the SSID is used to Figure 4 The code element 401-1 related to the SSID is used to send the code element 600-2 related to the access destination. Figure 4 The information 401-2 related to the access destination is sent as a symbol. Figure 6 The frame can also include Figure 6 The order in which the symbols are sent and the frame format are not affected by Figure 6 Limited by the composition.

[0121] Figure 7 Shows Figure 4 An example of a frame format of a modulated signal transmitted by base station 470, with the horizontal axis being time. Figure 7 As shown, the base station 470 sends a preamble code 701, and then sends a control information code element 702 and an information code element 703.

[0122] At this time, the preamble 701 is a code element used by a terminal receiving a modulated signal sent by the base station 470 to perform signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, and the like.

[0123] The control information symbol 702 includes data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, and information related to the frame format.

[0124] Information symbol 703 is a symbol for transmitting information. In the present embodiment, information symbol 703 is a symbol for transmitting desired information 472 described above.

[0125] in addition, Figure 4 The base station 470 may also send a message including Figure 7 The frame of the codewords other than the codewords recorded in the codeword (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword, etc.). In addition, the order in which the codewords are transmitted and the frame format are not affected by Figure 7 Therefore, in Figure 7In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0126] And, for example, it can be considered that the first device sends Figure 6 A method of transmitting a modulated signal in a frame format at a regular timing, for example repeatedly. Thus, a plurality of terminals can implement the above-described operation.

[0127] Figure 8 It shows the above Figure 4 A flowchart of an example of a process performed by the "first device 400", "terminal 450", and "base station (or AP) 470".

[0128] First, if Figure 8 As shown in 801, Figure 4 400 pairs of the first device Figure 6 The modulated signal in the frame format is sent.

[0129] ·So, if Figure 8 As shown in 802, receiving Figure 4 The modulated signal transmitted by the first device 400, Figure 4 The terminal 450 estimates the location or position of the terminal.

[0130] At the same time, Figure 8 As shown in 803, receiving Figure 4 The modulated signal transmitted by the first device 400, Figure 4 The terminal 450 knows the SSID of the base station that the terminal is going to access.

[0131] ·So, if Figure 8 The 804 shows that Figure 4 The terminal 450 sends a modulated signal including data related to the access destination for obtaining information such as a map, for example, using radio waves. Figure 4 The base station (or AP) 470 sends it.

[0132] ·like Figure 8 As shown in 805, the base station (or AP) 470 receives the modulated signal sent by the terminal 450, obtains the information of the access destination, and then accesses the desired access destination through the network to obtain the desired information such as the map.

[0133] ·So, if Figure 8 As shown in 806, Figure 4 The base station (or AP) 470 transmits a modulated signal including desired information such as the acquired map to the terminal 450 using, for example, radio waves.

[0134] ·like Figure 8As shown in 807, the terminal 450 receives the modulated signal sent by the base station (or AP) 470 and obtains the map (etc.) information. Then, the terminal 450 performs the following operations according to the map (etc.) information and the obtained location or position information of the terminal. Figure 5 Display shown.

[0135] Next, a plurality of first devices 400 are set up, and Figure 5 A working example in which a base station (or AP) 470 is set up at a location is described below.

[0136] and Figure 5 Likewise, in Fig. 9 A map showing a certain place.

[0137] Fig. 9 like Figure 5 As described in , this is a map of the "3rd floor plan". A-1, A-2, A-3, A-4, A-21, A-22, A-23, and A-24 are parking spaces for vehicles, and B-1 and B-2 indicate elevators.

[0138] So, in Fig. 9 The "○" 901-1 position is set with Figure 4 The first device with the same structure as the device 100 is set at position 901-1. Figure 4 The first device having the same configuration as the device 100 is named "device 1-1". The device 1-1 has information "A-1" as information about a place or information about a position, and transmits the information "A-1" as information about a place or information about a position.

[0139] exist Fig. 9 The "○" 901-2 position is set with Figure 4 The first device of the same structure as the device 100 of FIG. Figure 4 The first device having the same configuration as the device 100 is named "the 1st-2nd device". The 1st-2nd device has the information "A-2" as the information about the place or the information about the position, and transmits the information "A-2" as the information about the place or the information about the position.

[0140] exist Fig. 9 The "○" 901-3 position is set with Figure 4 The first device of the same structure as the device 100 of FIG. Figure 4The first device having the same structure as the device 100 is named "the 1-3 device". The 1-3 device has the information "A-3" as the information about the place or the information about the position, and transmits the information "A-3" as the information about the place or the information about the position.

[0141] exist Fig. 9 The "○" 901-4 position setting has the same Figure 4 The first device of the same structure as the device 100 of FIG. Figure 4 The first device having the same configuration as the device 100 is named "the 1st-4th device". The 1st-4th device has the information "A-4" as the information about the place or the information about the position, and transmits the information "A-4" as the information about the place or the information about the position.

[0142] exist Fig. 9 The "○" 901-21 position setting has the same Figure 4 The first device of the same structure as the device 100. The device having the same structure as the device 100 at the position 901-21 Figure 4 The first device having the same configuration as the device 100 is named "device 1-21". The device 1-21 has information "A-21" as information about a place or information about a position, and transmits the information "A-21" as information about a place or information about a position.

[0143] exist Fig. 9 The "○" 901-22 position setting has the same Figure 4 The first device of the same structure as the device 100. The device having the same structure as the device 100 at the position 901-22 Figure 4 The first device having the same configuration as the device 100 is named "the 1st-22nd device". The 1st-22nd device has the information "A-22" as the information about the place or the information about the position, and transmits the information "A-22" as the information about the place or the information about the position.

[0144] exist Fig. 9 The "○" 901-23 position setting has the same Figure 4 The first device of the same structure as the device 100. The device having the same structure as the device 100 at the position 901-23 Figure 4 The first device having the same configuration as device 100 is named "1-23 device". The 1-23 device has information "A-23" as information about a place or information about a position, and transmits the information "A-23" as information about a place or information about a position.

[0145] exist Fig. 9 The "○" 901-24 position setting has the same Figure 4 The first device of the same structure as the first device 400 of FIG. Figure 4 The first device having the same configuration as the first device 400 is named "1-24th device". The 1-24th device has information "A-24" as information about a place or information about a position, and transmits the information "A-24" as information about a place or information about a position.

[0146] and, Fig. 9 The "◎" 902 position setting has the same Figure 4 At this time, the base station (or AP) at position 902 with the same structure as the base station 470 is Figure 4 The SSID of the base station (or AP) having the same structure as base station 470 is set to "abcdef".

[0147] Exists in Fig. 9 The terminals around the location shown on the map can access the Fig. 9 The 902 position has the same Figure 4 The base station 470 is similarly constituted as a base station (or AP). However, it is set Fig. 9 The "1-1 device" of 901-1 uses "abcdef" as the information related to the SSID (refer to Figure 4 401-1) is sent.

[0148] Likewise, it is set Fig. 9 The "1st-2 device" of 901-2 has "abcdef" as the information related to the SSID (refer to Figure 4 400-1) is sent.

[0149] is set in Fig. 9 The "1st-3rd device" of 901-3 has "abcdef" as the information related to the SSID (refer to Figure 4 401-1) is sent.

[0150] is set in Fig. 9 The "1st-4th device" of 901-4 has "abcdef" as the information related to the SSID (refer to Figure 4 401-1) is sent.

[0151] is set in Fig. 9 901-21 "1st-21st device", "abcdef" is used as the information related to SSID (refer to Figure 4 401-1) is sent.

[0152] is set in Fig. 9 The "1st-22nd device" of 901-22 has "abcdef" as the information related to the SSID (refer to Figure 4 401-1) is sent.

[0153] is set in Fig. 9 The "1st-23rd device" of 901-23 has "abcdef" as the information related to the SSID (refer to Figure 4 401-1) is sent.

[0154] is set in Fig. 9 901-24 "1st-24th device", "abcdef" is used as the information related to SSID (refer to Figure 4 401-1) is sent.

[0155] A specific working example is described below.

[0156] Assume that Fig. 9 The 903-1 position exists with Figure 4 The terminal 450 is similarly constructed as the terminal. In this way, the terminal receives Fig. 9 The terminal obtains the location information "A-4" by reading the modulated signal sent by the "1-4th device" at the 901-4 position. In addition, the terminal obtains the information of the SSID "abcdef", based on which the terminal accesses the Fig. 9 The 902 has Figure 4 The base station 470 also constitutes a base station (or AP), and the terminal is located at Fig. 9 The 902 has Figure 4 The base station (or AP) of the same structure as the base station 470 obtains information such as maps. Therefore, the terminal displays map information and location information (refer to Figure 5 .but, Figure 5 These are examples only).

[0157] Assume that Fig. 9 The 903-2 position exists with Figure 4 The terminal 450 is similarly constructed as the terminal. In this way, the terminal receives Fig. 9 The terminal obtains the location information of "A-22" by reading the modulated signal sent by the "1st-22 device" at the 901-22 position. In addition, the terminal obtains the information of the SSID "abcdef", based on which the terminal accesses the Fig. 9 The 902 has Figure 4 The base station 470 also constitutes a base station (or AP), and the terminal is located at Fig. 9 The 902 has Figure 4The base station (or AP) of the same structure as the base station 470 obtains information such as maps. Therefore, the terminal displays map information and location information (refer to Figure 5 .but, Figure 5 These are examples only).

[0158] In addition, the terminal will Figure 5 The map (surrounding information) and location information shown are stored in advance in a storage unit of the terminal. When a user of the terminal needs it, the stored information is retrieved, so that the user can use the map (surrounding information) and location information more conveniently.

[0159] As described above, since the first device transmits a modulated signal through visible light, the terminal that can receive the modulated signal is limited to a range that can receive the signal light from the position of the first device. However, the location or position information transmitted by the first device is received by the terminal, so that the terminal can easily (without having to perform complex signal processing) obtain highly accurate location information. Furthermore, when the first device is set in a place where it is difficult to receive satellite radio waves from GPS, even in a place where it is difficult to receive radio waves from GPS satellites, the terminal can safely obtain highly accurate location information by receiving the modulated signal transmitted by the first device.

[0160] Furthermore, based on the SSID information sent from the first device, the terminal connects to the base station (or AP) and obtains information, thereby achieving the effect of being able to obtain information securely. This is because, when obtaining information from a modulated signal of visible light, since it is visible light, the user can easily identify the first device that sent the modulated signal, thereby being able to easily determine whether the information source is secure.

[0161] For example, when the SSID is obtained from the modulated signal of the radio wave transmitted by the wireless LAN, it is not easy for the user to identify the device that transmitted the radio wave. Therefore, from the perspective of ensuring the security of information, it is better to obtain the SSID by visible light communication.

[0162] In addition, Figure 4 The wireless device 453 of the terminal 450 may also have multiple input signals. For example, a control signal for controlling the wireless device 453 and sending information to the base station may also exist as an input signal. At this time, a working example that can be considered is that the wireless device 453 starts communication according to the control signal. As described above, the configuration of the first device is not affected by Figure 4 The configuration of the first device 400 is limited, and the configuration of the terminal is not limited Figure 4 The connection destination and structure of the base station 470 are not limited to the structure of the terminal 450. Figure 4 shown.

[0163] And, in Figure 4 Although the configuration of one base station (or AP) is described in the specification, there may be multiple (secure) base stations (or APs) that can be accessed by multiple terminals. Figure 4 The SSID-related symbol sent by the first device 400 may include information indicating the SSID of each of the multiple base stations (or APs). Figure 4 The terminal 450 can select a base station (or AP) for wireless connection (or can connect to multiple base stations (or APs)) based on the information of the SSIDs of multiple existing base stations.

[0164] For example, suppose there are three base stations (or APs). Name them base station #A, base station #B, and base station #C. Then, set the SSID of base station #A to "abcdef", the SSID of base station #B to "ghijk", and the SSID of base station #C to "pqrstu". In this way, the modulated signal sent by the first device Figure 6 The SSID-related symbol 600-1 in the frame format includes information related to "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C". Thus, Figure 4 The terminal 450 receives the code element 600-1 related to the SSID, and selects a base station (or AP) for wireless connection based on the information of "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C".

[0165] (Implementation 4)

[0166] Fig.10 An example of the configuration of the communication system in this embodiment is shown. Fig.10 The communication system includes, for example: a device 1000 having a light source using visible light such as an LED, or a lighting device, or a lamp; a terminal 1050; and, for example, a base station 470 that communicates with the terminal 1050. Fig.10 The device 1000 includes, for example, an illumination device using visible light such as an LED, or a light source, or a lamp. In addition, the device 1000 is named as the "second device" in this embodiment. Fig.10 The second device 1000 is for performing Figure 1 The components that perform the same operations as those of the first device 100 are given the same reference numerals.

[0167] exist Fig.10 The terminal 1050 is used for Figure 1The components of the terminal 150 that perform the same operation are given the same reference numerals.

[0168] In addition, about Fig.10 The wireless device 453 communicates with the base station 470, for example, using radio waves.

[0169] exist Fig.10 In the second device 1000, the transmitter 102 receives information 1001-1 related to the SSID, information 1001-2 related to the encryption key, and data 1002 as input, generates a (light) modulation signal based on these input signals, and outputs a modulation signal 103. Then, the modulation signal 103 is transmitted from the light source 104, for example.

[0170] Next, the information 1001 - 1 related to the SSID and the information 1001 - 2 related to the encryption key will be described.

[0171] First, the information 1001 - 1 related to the SSID will be described.

[0172] The information 1001-1 related to the SSID is shown Fig.10 In addition, as an example, the base station (or AP) 470 sends a modulated signal by radio waves and receives a modulated signal by radio waves. That is, the second device 1000 can provide the terminal with access to the base station 470 as a secure access destination. Based on this, it is possible to obtain Fig.10 The terminal 1050 can securely obtain information from the base station (or AP) 470. In addition, the device 1000 can limit the terminals that access the base station 470 to terminals in a space that can receive the optical signal sent (irradiated) by the device 1000. In addition, when the terminal 1050 receives an optical signal sent in a predetermined manner, it can determine whether the notified SSID is the SSID of a secure base station, and can also perform a process to determine whether it is secure. For example, the device 1000 includes a specified identifier in the optical signal and sends it, and the terminal determines whether the SSID notified based on the received identifier is the SSID of a secure base station.

[0173] In addition, Fig.10 Although only the base station (or AP) 470 is shown, even if there are base stations (or APs) other than the base station (or AP) 470, Fig.10 The terminal 1050 also accesses the base station (or AP) 470 to obtain information.

[0174] The information 1001-2 related to the encryption key is Fig.10 The terminal 1050 is for Fig.10information related to the encryption key required for communicating with the base station (or AP) 470 in Fig.10 The terminal 1050 is connected via Fig.10 The second device 1000 obtains the information, thereby enabling encrypted communication with the base station (or AP) 470.

[0175] Fig.10 The terminal 1050 receives the modulated signal sent by the second device 1000. Fig.10 Terminal 1050, about the Figure 1 Terminal 150, Figure 4 The components of the terminal 450 that perform the same operation are given the same reference numerals.

[0176] The light receiving unit 151 of the terminal 1050, such as an image sensor such as a CMOS or an organic CMOS, receives the modulated signal sent by the second device 1000. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0177] The data analysis unit 155 receives the received data 154 as input, and outputs, based on the received data, information 1051 of the SSID of the base station (470) to be connected, and information 1052 of an encryption key used to communicate with the base station (470) to be connected. For example, in a wireless LAN (Local Area Network), encryption methods include WEP (Wired Equivalent Privacy), WPA (Wi-Fi (registered trademark) Protected Access), and WPA2 (Wi-Fi Protected Access 2) (PSK (Pre-Shared Key) mode, EAP (Extended Authentication Protocol) mode). In addition, the encryption method is not limited to this.

[0178] The display unit 157 receives the SSID information 1051 and the encryption key information 1052 as input, and displays, for example, the SSID and encryption key of the communication partner to which the wireless device 453 of the terminal is about to access. (This display is named the first display in this embodiment.)

[0179] For example, after the first display, Fig.10The wireless device 453 of the terminal 1050 takes the SSID information 1051 and the encryption key information 1052 as input and establishes a connection with the base station (or AP) 470 (for example, using radio waves). Fig.10 When communicating with the wireless device 453 of the terminal 1050, for example, the modulated signal is sent using radio waves.

[0180] after, Fig.10 The wireless device 453 of the terminal 1050 takes the data 1053 and the control signal 1054 as input, performs modulation on the data 1053 according to the control of the control signal 1054, and transmits the modulated signal as an electric wave.

[0181] Then, for example, the base station (or AP) 470 transmits data to the network (471) and receives data from the network (472). Fig.10 The terminal 1050 sends the modulated signal as an electric wave.

[0182] Fig.10 The wireless device 453 included in the terminal 1050 performs processing such as demodulation and error correction decoding on the modulated signal received as a radio wave, and obtains the received data 1056. The display unit 157 displays the received data 1056.

[0183] Fig.11 Shows Fig.10 An example of a frame format of a modulated signal transmitted by the second device 1000. Fig.11 In the figure, the horizontal axis is time, and the Figure 2 , Figure 6 The same code elements are given the same numbers and their descriptions are omitted.

[0184] The code element 600-1 associated with the SSID is used to send Fig.10 The code element 1001-1 of the information related to the SSID and the code element 1101 related to the encryption key are used to send Fig.10 Data symbol 1102 is a symbol for transmitting data 1002.

[0185] The second device transmits the preamble 201, the control information symbol 202, the symbol 600-1 related to the SSID, the symbol 1101 related to the encryption key, and the data symbol 1102. Fig.10 The second device 1000 may also send a message including Fig.11Furthermore, the order in which the symbols are sent and the frame format are not affected by Fig.11 Limited by the composition.

[0186] Fig.12 Shows Fig.10 An example of a frame format of a modulated signal transmitted by the wireless device 453 of the terminal 1050. Fig.12 In the example, the horizontal axis is time. Fig.12 As shown, Fig.10 For example, after sending the preamble code 1201, the wireless device 453 of the terminal 1050 sends the control information codeword 1202 and the information codeword 1203.

[0187] At this time, the leading code 1201 is received Fig.10 The modulated signal sent by the wireless device 453 of the terminal 1050 is a codeword used by the base station (or AP) 470, for example, when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0188] The control information codeword 1202 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. The base station (or AP) 470 implements demodulation of the modulated signal based on the information contained in the control information codeword 1202.

[0189] Information symbol 1203 is used to Fig.10 The wireless device 453 of the terminal 1050 transmits the codeword for data.

[0190] in addition, Fig.10 The wireless device 453 of the terminal 1050 may also send a message including Fig.12 The frame of the codewords other than the codewords recorded in the codeword (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword, etc.). In addition, the order in which the codewords are transmitted and the frame format are not affected by Fig.12 And, in Fig.12 , there can be multiple code elements in the frequency axis direction, that is, there can be code elements in multiple frequencies (multiple carriers).

[0191] In addition, in the third embodiment, Figure 4 The wireless device 453 of the terminal 1050 uses the modulated signal when sending it. Fig.12 frame format.

[0192] Figure 7 Shows Fig.10 An example of a frame format of a modulated signal transmitted by base station 470. Figure 7In the example, the horizontal axis is time. Figure 7 As shown, after the base station 470 sends the preamble code 701, it sends the control information code element 702 and the information code element 703.

[0193] At this time, the preamble 701 is used to receive the modulated signal sent by the base station 470. Fig.10 The wireless device 453 of the terminal 1050 performs codewords such as signal detection, time synchronization, frame synchronization, frequency synchronization, and frequency offset estimation.

[0194] The control information symbol 702 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. Fig.10 The wireless device 453 of the terminal 1050 performs demodulation of the modulated signal according to the information of the code element.

[0195] Information symbol 703 is used to Fig.10 The base station (or AP) 470 transmits codewords for data.

[0196] in addition, Fig.10 The base station (or AP) 470 may send a message including Figure 7 The frame of the codewords other than the codewords recorded in the codeword (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword, etc.). In addition, the order in which the codewords are transmitted and the frame format are not affected by Figure 7 And, in Figure 7 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0197] And, for example, it can be considered that the second device 1000 sends Fig.11 A method of transmitting a modulated signal in a frame format at a regular timing, such as repeatedly. Based on this, multiple terminals can implement the above-described operation.

[0198] Fig.13 It shows the above Fig.10 A flowchart of an example of a process performed by the "second device 1000", "terminal 1050", and "base station (or AP) 470".

[0199] First, if Fig.13 As shown in 1301, Fig.10 The second device 1000 pairs Fig.11 The modulated signal in the frame format is sent.

[0200] And, if Fig.13 As shown in 1302, receiving Fig.10 The modulated signal sent by the second device 1000, Fig.10 The terminal 1050 obtains the SSID of the base station that the terminal 1050 is going to access.

[0201] At the same time, Fig.13 As shown in 1303, Fig.10 The terminal 1050 obtains an encryption key used when communicating with the base station 470 that the terminal is about to access.

[0202] ·and, Fig.10 The terminal 1050 is connected with Fig.10 The base station 470 is connected via radio waves (1304).

[0203] ·according to Fig.10 The response of base station 470 is as follows: Fig.13 As shown in 1305, Fig.10 The terminal 1050 ends with Fig.10 connection of base station 470.

[0204] And, if Fig.13 As shown in 1306, Fig.10 The terminal 1050 transmits the connection destination information to the base station 470 by using radio waves. Fig.10 The base station 470 sends it.

[0205] · In this way, Fig.13 As shown in 1307, Fig.10 The base station 470 obtains the Fig.10 The terminal 1050 sends the information.

[0206] And, if Fig.13 As shown in 1308, Fig.10 The base station 470 uses radio waves to transmit the acquired information to Fig.10 The terminal 1050 sends, Fig.10 The terminal 1050 obtains the information.

[0207] Fig.10 Terminal 1050, for example, when necessary, via Fig.10 The base station 470 obtains the required information from the network.

[0208] As described above, by connecting the terminal to the base station (or AP) and obtaining information based on the SSID information and encryption key information sent from the second device, the effect that can be obtained is that the information can be obtained securely via the base station (or AP) that ensures security. This is because when the information is obtained based on the modulated signal of visible light, since it is visible light, the user can easily determine whether the information source is safe.

[0209] For example, when the SSID is obtained from the modulated signal of the radio wave transmitted by the wireless LAN, it is difficult for the user to identify the device that transmitted the radio wave. Therefore, from the perspective of ensuring the security of information, it is better to obtain the SSID by visible light communication.

[0210] In addition, in this embodiment, although the case where the second device sends encryption key information is described, for example, when the base station (or AP) does not perform encrypted communication using the encryption key, the second device does not send the encryption key information, but only sends information related to the SSID. The same implementation can be achieved simply by deleting the configuration related to the encryption key.

[0211] Furthermore, the configuration of the second device is not affected by Fig.10 The configuration shown is not limited to the terminal configuration. Fig.10 The configuration shown is limited to the connection destination of the base station and the configuration method are not limited to Fig.10 limited.

[0212] Therefore, in this embodiment, Fig.10 Although the configuration of one base station (or AP) is described in the specification, there may be multiple (safe) base stations (or APs) that the terminal can access (in addition, these base stations and the terminal use radio waves to transmit and receive modulated signals). In this case, Fig.10 The SSID-related symbol sent by the second device 1000 may include information about the SSID of each of the multiple existing base stations (or APs). Fig.10 The code element related to the encryption key sent by the second device 1000 may include information about the encryption key used to connect to each of the existing multiple base stations (or APs). Fig.10 The terminal 1050 can select a base station (or AP) for wireless connection (for example, through radio waves) based on the SSID information and encryption key information of multiple existing base stations (or can connect to multiple base stations (or APs).

[0213] For example, suppose there are three base stations (or APs). They are named base station #A, base station #B, and base station #C. Also, the SSID of base station #A is set to "abcdef", the SSID of base station #B is set to "ghijk", the SSID of base station #C is set to "pqrstu", the encryption key used to connect to base station #A is set to "123", the encryption key used to connect to base station #B is set to "456", and the encryption key used to connect to base station #C is set to "789".

[0214] In this way, the modulated signal sent by the second device Fig.11The codeword 600-1 related to the SSID in the frame format includes information related to "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C". And, Fig.11 The code element 1101 related to the encryption key in the frame format includes information related to "the encryption key "123" for connecting with the base station #A", "the encryption key "456" for connecting with the base station #B", and "the encryption key "789" for connecting with the base station #C".

[0215] and, Fig.10 Terminal 1050 receives codeword 600-1 related to SSID, obtains information about "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C", receives codeword 1101 related to encryption key, and obtains information about "encryption key "123" for connecting to base station #A", "encryption key "456" for connecting to base station #B", and "encryption key "789" for connecting to base station #C". Thus, based on this information, Fig.10 The terminal 1050 selects a base station (or AP) for wireless connection (for example, through radio waves) to establish a connection.

[0216] Furthermore, as shown in the present embodiment, a base station to which the terminal is to access is set using a light source such as an LED, whereby a modulation signal for wireless sent by the terminal does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, and a modulation signal sent by the base station does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, thereby achieving an effect of improving the data transmission efficiency of wireless communications.

[0217] Therefore, regarding the encryption key, as explained above, it can be an encryption key for the SSID of the wireless LAN, or it can be an encryption key that limits the connection form, service form, connection range of the network, etc. (that is, the encryption key can be used for some kind of restriction.).

[0218] (Implementation 5) [SSID and password separation]

[0219] Fig.14 An example of the configuration of a device including a light source using visible light such as an LED, or lighting, or a lamp, a terminal, and a base station for communicating with the terminal in this embodiment is shown. Fig.14The communication system includes, for example, devices 1400A and 1400B having light sources such as LEDs, or lighting, or lamps; a terminal 1050; and a base station 470, for example, for communicating with the terminal 1050. Fig.14 The device 1400A is named as the "third device" in this embodiment. Fig.14 The device 1400B is named as the "fourth device" in this embodiment. Fig.14 Terminal 1050, for Figure 1 , Fig.10 The same actions are assigned the same numbers, and the same is true for base stations or APs. Figure 4 The same actions are given the same number.

[0220] in addition, Fig.14 The wireless device 453 communicates with the base station 470 using, for example, radio waves.

[0221] exist Fig.14 In the third device 1400A, the transmitter 1404-1 receives the information 1401-1 related to the SSID and the data 1402-1 as input, generates a (light) modulated signal based on these input signals, and outputs a modulated signal 1405-1. Then, the modulated signal 1405-1 is transmitted from the light source 1406-1.

[0222] exist Fig.14 In the fourth device 1400B, the transmitter 1404-2 receives the information 1403-2 related to the encryption key and the data 1402-2 as input, generates a (light) modulation signal based on these input signals, and outputs a modulation signal 1405-2. Then, the modulation signal 1405-2 is transmitted from the light source 1406-2.

[0223] Next, the information 1401 - 1 related to the SSID and the information 1403 - 2 related to the encryption key will be described.

[0224] First, the information 1401 - 1 related to the SSID will be described.

[0225] The information 1401-1 related to the SSID is shown Fig.14 That is, the third device 1400A can provide the terminal with access to the base station 470 as a safe access destination via radio waves. Fig.14 The terminal 1050 is able to securely obtain information from the base station (or AP) 470.

[0226] In addition, when the terminal 1050 receives an optical signal transmitted in a predetermined manner, it can determine whether the notified SSID is the SSID of a secure base station, and can also perform a process of determining whether it is secure. For example, the device 1400A may include a predetermined identifier in an optical signal and transmit it, and the terminal may determine whether the SSID notified based on the received identifier is the SSID of a secure base station.

[0227] In addition, although Fig.14 Only base station (or AP) 470 is shown in FIG. 4 , for example, even if there are base stations (or APs) other than base station (or AP) 470, Fig.14 The terminal 1050 can also access the base station (or AP) 470 to obtain information.

[0228] The information 1403-2 related to the encryption key is Fig.14 The terminal 1050 is for Fig.14 The base station (or AP) 470 in the communication via radio waves and the information related to the encryption key, Fig.14 The terminal 1050 is connected via Fig.14 The fourth device 1400B obtains the information and is therefore able to conduct encrypted communications with the base station (or AP) 470.

[0229] first, Fig.14 The terminal 1050 receives the modulated signal sent by the third device 1400A.

[0230] The light receiving unit 151 such as an image sensor such as CMOS or organic CMOS provided in the terminal 1050 receives the modulated signal sent by the third device 1400A. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0231] The data analysis unit 155 receives the received data 154 as input, and outputs information 1051 of, for example, the SSID of the base station (470) to be the connection destination from the received data.

[0232] However, the wireless device 453 included in the terminal 1050 obtains the information of the SSID of the base station to which the wireless device 453 connects via radio waves from the SSID information 1051 .

[0233] then, Fig.14 The terminal 1050 receives the modulated signal sent by the fourth device 1400B.

[0234] The light receiving unit 151 such as an image sensor such as a CMOS or an organic CMOS of the terminal 1050 receives the modulated signal sent by the fourth device 1400B. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0235] The data analysis unit 155 receives the received data 154 as input, and outputs information 1052 of an encryption key used for communicating with a base station (470) that is a connection destination, for example. For example, in a wireless LAN (Local Area Network), encryption methods include WEP (Wired Equivalent Privacy), WPA (Wi-Fi Protected Access), and WPA2 (Wi-Fi Protected Access 2) (PSK (Pre-Shared Key) mode, EAP (Extended Authentication Protocol) mode). In addition, the encryption method is not limited to this.

[0236] However, the wireless device 453 included in the terminal 1050 obtains the encryption key information of the base station to which the wireless device 453 is connected from the encryption key information 1052 used for communicating with the base station (470) to be connected (for example, via radio waves).

[0237] The display unit 157 receives the SSID information 1051 and the encryption key information 1052 as input, and displays, for example, the SSID and encryption key of the communication partner to which the wireless device 453 of the terminal is to access. (This display is named the first display in this embodiment.)

[0238] For example, after the 1st display, Fig.14 The wireless device 453 of the terminal 1050 takes the SSID information 1051 and the encryption key information 1052 as input, and establishes a connection with the base station (or AP) 470 via radio waves (for example, the connection is made using radio waves). At this time, the base station (or AP) 470 also connects to Fig.14 When communicating with the wireless device 453 of the terminal 1050, the modulated signal is sent using, for example, radio waves.

[0239] after, Fig.14 The wireless device 453 of the terminal 1050 takes the data 1053 and the control signal 1054 as input, modulates the data 1053 according to the control of the control signal 1054, and transmits the modulated signal via radio waves.

[0240] Then, for example, the base station (or AP) 470 sends data to the network (471) and receives data from the network (472). Fig.14 The terminal 1050 sends the modulated signal via radio waves.

[0241] Fig.14 The wireless device 453 of the terminal 1050 performs processing such as demodulation and error correction decoding on the received modulated signal to obtain the received data 1056. The display unit 157 displays the received data 1056.

[0242] Fig.15 Shows Fig.14 An example of a frame format of a modulated signal transmitted by the third device 1400A. Fig.15 In the figure, the horizontal axis is time. Figure 2 , Figure 6 , Fig.11 The same code elements are given the same reference numerals and their descriptions are omitted.

[0243] The code element 600-1 associated with the SSID is used to Fig.14 The data symbol 1102 is a symbol for transmitting the information 1401-1 related to the SSID. The data symbol 1102 is a symbol for transmitting the data 1402-1.

[0244] The third device 1400A transmits the preamble 201, the control information symbol 202, the symbol 600-1 related to the SSID, and the data symbol 1102. Fig.14 The third device 1400A may also send a message including Fig.15 Furthermore, the order in which the symbols are sent and the frame format are not affected by Fig.15 Limited by the composition.

[0245] Fig.16 Shows Fig.14 An example of a frame format of a modulated signal transmitted by the fourth device 1400B. Fig.16 In the figure, the horizontal axis is time. Figure 2 , Fig.11 The same symbols are assigned the same reference numerals and their descriptions are omitted.

[0246] The code element 1101 related to the encryption key is used to Fig.14 Data symbol 1102 is a symbol for transmitting information 1403-2 related to the encryption key. Data symbol 1102 is a symbol for transmitting data 1402-2.

[0247] The fourth device 1400B transmits the preamble 201, the control information symbol 202, the symbol 1101 related to the encryption key, and the data symbol 1102. Fig.14 The fourth device 1400B may also send a message including Fig.16 Furthermore, the order in which the symbols are sent and the frame format are not affected by Fig.16 limited.

[0248] Fig.12 Shows Fig.14 An example of a frame format of a modulated signal transmitted by the wireless device 453 of the terminal 1050. Fig.12 In the example, the horizontal axis is time. Fig.12 As shown, Fig.14 For example, after sending the preamble code 1201, the wireless device 453 of the terminal 1050 sends the control information codeword 1202 and the information codeword 1203.

[0249] At this time, the leading code 1201 is received Fig.14 The base station (or AP) 470 of the wireless device 453 of the terminal 1050 sends a modulated signal, for example, a code element used when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0250] The control information codeword 1202 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. The base station (or AP) 470 implements demodulation of the modulated signal based on the information contained in the control information codeword 1202.

[0251] Information symbol 1203 is used to Fig.14 The wireless device 453 of the terminal 1050 transmits the codeword for data.

[0252] in addition, Fig.14 The wireless device 453 of the terminal 1050 may also send a message including Fig.12 The frame of the codewords other than the codewords recorded in the codeword (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword, etc.). In addition, the order in which the codewords are transmitted and the frame format are not affected by Fig.12 Therefore, in Fig.12 , there can be multiple code elements in the frequency axis direction, that is, there can be code elements on multiple frequencies (multiple carriers).

[0253] Figure 7 Shows Fig.14 An example of a frame format of a modulated signal transmitted by base station 470. Figure 7 In the example, the horizontal axis is time. Figure 7 As shown, after the base station 470 sends the preamble code 701, it sends the control information code element 702 and the information code element 703.

[0254] At this time, the preamble 701 is used to receive the modulated signal sent by the base station 470. Fig.14 The wireless device 453 of the terminal 1050 performs codewords such as signal detection, time synchronization, frame synchronization, frequency synchronization, and frequency offset estimation.

[0255] The control information symbol 702 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. Fig.14 The wireless device 453 of the terminal 1050 performs demodulation of the modulated signal according to the information of the code element.

[0256] Information symbol 703 is used to Fig.14 The base station (or AP) 470 transmits codewords for data.

[0257] in addition, Fig.14 The base station (or AP) 470 may also send a message including Figure 7 The frame of the codewords other than the codewords recorded in the codeword (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword, etc.). In addition, the order in which the codewords are transmitted and the frame format are not affected by Figure 7 Therefore, in Figure 7 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0258] And, for example, it can be considered that the third device 1400A sends Fig.15 A method of transmitting a modulated signal in a frame format at a regular timing, such as repeatedly. Based on this, multiple terminals can implement the above-described operation.

[0259] Similarly, it can be considered that the fourth device 1400B sends Fig.16 A method of transmitting a modulated signal in a frame format at a regular timing, such as repeatedly. Based on this, multiple terminals can implement the above-described operation.

[0260] Fig.17 It shows the above Fig.14 A flowchart of a first example of a process performed by the "third device 1400A", "fourth device 1400B", "terminal 1050", and "base station (or AP) 470". Fig.17 In Fig.13 The same actions are given the same number.

[0261] First, if Fig.17 As shown in 1701, Fig.14 The third device 1400A is Fig.15 The modulated signal in the frame format is sent.

[0262] ·So, if Fig.17 As shown in 1702, receiving Fig.14 The modulated signal sent by the third device 1400A, Fig.14 The terminal 1050 obtains the SSID of the base station that the terminal 1050 is going to access.

[0263] · Then, if Fig.17 As shown in 1703, Fig.14 The fourth device 1400B is Fig.16 The modulated signal in the frame format is sent.

[0264] ·So, if Fig.17 As shown in 1704, receiving Fig.14 The modulated signal transmitted by the fourth device 1400B, Fig.14 The terminal 1050 obtains an encryption key used when communicating with the base station 470 that the terminal is about to access.

[0265] ·then, Fig.14 The terminal 1050 implements Fig.14 The base station 470 is connected via radio waves (1304).

[0266] ·according to Fig.14 The response of base station 470 is as follows: Fig.17 As shown in 1305, Fig.14 The terminal 1050 ends with Fig.14 The base station 470 is connected via radio waves.

[0267] ·So, if Fig.17 As shown in 1306, Fig.14 The terminal 1050 sends the connection destination information to the base station 470 by radio waves. Fig.14 Base station 470.

[0268] · In this way, Fig.17 As shown in 1307, Fig.14 The base station 470 obtains the Fig.14 The terminal 1050 sends the information.

[0269] ·So, if Fig.17 As shown in 1308, Fig.14 The base station 470 transmits the acquired information to Fig.14 The terminal 1050 sends, Fig.14The terminal 1050 obtains the information.

[0270] Fig.14 Terminal 1050, for example, when necessary, via Fig.14 The base station 470 obtains the required information from the network.

[0271] Fig.18 It shows the above Fig.14 A flowchart of a second example of a process performed by the "third device 1400A", "fourth device 1400B", "terminal 1050", and "base station (or AP) 470". Fig.18 In Fig.13 The same actions are given the same number.

[0272] First, if Fig.18 As shown in 1801, Fig.14 The fourth device 1400B is Fig.16 The modulated signal in the frame format is sent.

[0273] ·So, if Fig.18 As shown in 1802, receiving Fig.14 The modulated signal transmitted by the fourth device 1400B, Fig.14 The terminal 1050 obtains the encryption key used in the communication with the base station that the terminal 1050 is about to access.

[0274] · Then, if Fig.18 As shown in 1803, Fig.14 The third device 1400A is Fig.15 The modulated signal in the frame format is sent.

[0275] ·So, if Fig.18 As shown in 1804, receiving Fig.14 The modulated signal sent by the third device 1400A, Fig.14 The terminal 1050 obtains the SSID of the base station 470 that the terminal is going to access.

[0276] ·then, Fig.14 The terminal 1050 implements Fig.14 The base station 470 is connected via radio waves (1304).

[0277] ·pass Fig.14 The response of base station 470 is as follows: Fig.18 As shown in 1305, Fig.14 The terminal 1050 ends with Fig.14 The base station 470 is connected via radio waves.

[0278] ·So, if Fig.18 As shown in 1306, Fig.14 The terminal 1050 transmits the information of the connection destination to the base station 470 by radio waves. Fig.14 The base station 470 sends it.

[0279] · In this way, Fig.18 As shown in 1307, Fig.14 The base station 470 obtains the Fig.14 The terminal 1050 sends the information.

[0280] ·So, if Fig.18 As shown in 1308, Fig.14 The base station 470 transmits the acquired information to Fig.14 The terminal 1050 sends, Fig.14 The terminal 1050 obtains the information.

[0281] Fig.14 Terminal 1050, for example, when necessary, via Fig.14 The base station 470 obtains the required information from the network.

[0282] As described above, based on the SSID information and encryption key information sent from the third device and the fourth device, the terminal connects to the base station (or AP) and obtains information, and the effect that can be obtained is that the information can be obtained safely via the base station (or AP) that ensures security. This is because, when the information is obtained through the modulated signal of visible light, since it is visible light, the user can easily determine whether the information source is safe.

[0283] For example, when the SSID is obtained from the modulated signal of the radio wave transmitted by the wireless LAN, it is not easy for the user to distinguish the device that transmitted the radio wave. Therefore, from the perspective of ensuring the security of information, it is better to obtain the SSID by visible light communication.

[0284] In addition, although the present embodiment describes a case where the fourth device sends encryption key information, for example, when the base station (or AP) does not perform encrypted communication using an encryption key, the fourth device may not send encryption key information, but only send information related to the SSID. In this way, the same implementation can be achieved by deleting the configuration related to the encryption key.

[0285] Furthermore, as shown in this embodiment, by separating the device that transmits information related to the SSID and the device that transmits information related to the encryption key, more secure communication between the terminal and the base station can be achieved.

[0286] For example, considering Fig.19 The space shown. Fig.19As shown, there are area #1 and area #2, and there is an entrance and a wall between area #1 and area #2. Here, it is set that movement from area #1 to area #2 and movement from area #2 to area #1 can only be through this entrance.

[0287] exist Fig.19 In area #1, in addition to the base station (or AP), the third device and the fourth device are set. In addition, only the third device is set in area #2.

[0288] Here, it is assumed that the radio waves sent by the base station (or AP) can be received in both area #1 and area #2. At this time, the terminal in area #1 where the fourth device is installed can communicate with the base station. Furthermore, the terminal connected to the base station in area #1 can communicate with the base station even if it moves to area #2.

[0289] Furthermore, even when a terminal connected to a base station in area #1 moves to an area other than area #1 and area #2 and then returns to either area #1 or area #2, it can communicate with the base station.

[0290] In addition, a terminal that cannot enter area #1 cannot obtain an encryption key. In this case, the terminal only knows the SSID of the base station (or AP). At this time, since only the SSID is known, the terminal can receive communication with the base station through the services that can be enjoyed.

[0291] However, only terminals that can enter area #1 can communicate with the base station, thereby ensuring the security of communication. In addition, a system can be constructed that can provide different services according to the area.

[0292] In addition, the terminal changes the encryption key used for communicating with the base station (for example, at a certain time interval), so that communication with the base station cannot be performed using the encryption key before the change. Through this operation, more secure communication can be achieved.

[0293] Therefore, as described previously, the encryption key can be an encryption key for the SSID of a wireless LAN, or can be an encryption key for limiting the connection form, service form, connection range of the network, etc. (that is, an encryption key can be imported when certain restrictions are desired).

[0294] The configuration of the third device and the configuration of the fourth device are not limited to Fig.14 The configuration shown in the figure is not limited to Fig.14 The configuration shown in the figure is also not affected by the connection destination and configuration method of the base station. Fig.14 limited.

[0295] Furthermore, in this embodiment, Fig.14 Although the configuration of one base station (or AP) is described in the specification, there may be multiple (secure) base stations (or APs) that the terminal can access. Fig.14 The SSID-related symbol sent by the third device 1400A may include information about the SSID of each of the multiple base stations (or APs) that exist. Fig.14 The encryption key-related codeword sent by the fourth device 1400B may include information about the encryption key used to connect to each of the multiple base stations (or APs) that exist. Fig.14 The terminal 1050 can select a base station (or AP) for wireless connection (or can also connect to multiple base stations (or APs)) based on the SSID information and encryption key information of multiple existing base stations.

[0296] For example, suppose there are three base stations (or APs). They are named base station #A, base station #B, and base station #C. Then, the SSID of base station #A is set to "abcdef", the SSID of base station #B is set to "ghijk", and the SSID of base station #C is set to "pqrstu", and the encryption key used to connect to base station #A is set to "123", the encryption key used to connect to base station #B is set to "456", and the encryption key used to connect to base station #C is set to "789".

[0297] In this way, the modulated signal sent by the third device Fig.15 The code element 600-1 related to the SSID in the frame format includes information related to "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C". And, the modulated signal sent by the fourth device Fig.16 The code element 1101 related to the encryption key in the frame format includes information related to "the encryption key "123" for connecting with the base station #A", "the encryption key "456" for connecting with the base station #B", and "the encryption key "789" for connecting with the base station #C".

[0298] then, Fig.14Terminal 1050 receives codeword 600-1 related to SSID, obtains information about "SSID "abcdef" of base station #A", "SSID "ghijk" of base station #B", and "SSID "pqrstu" of base station #C", receives codeword 1101 related to encryption key, and obtains information about "encryption key "123" for connecting to base station #A", "encryption key "456" for connecting to base station #B", and "encryption key "789" for connecting to base station #C". Thus, based on this information, Fig.14 The terminal 1050 selects a base station (or AP) for wireless connection and connects.

[0299] Furthermore, as shown in the present embodiment, by utilizing a light source such as an LED, the base station to which the terminal is to access is set, accordingly, the modulation signal for wireless sent at the terminal does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, and the modulation signal sent at the base station does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, thereby achieving an effect of improving the data transmission efficiency of wireless communications.

[0300] (Implementation 6) [Base station and LED mounted on base station]

[0301] Fig. 20 An example of the configuration of the communication system in this embodiment is shown. Fig. 20 The communication system includes a light source of visible light such as LED, or lighting, or lamp, and includes a base station 2000 having a wireless device 2001 and a terminal 1050. Fig. 20 In Figure 1 , Fig.10 The same actions are given the same number.

[0302] in addition, Fig. 20 The communication between the wireless device 2001 and the wireless device 453 uses, for example, radio waves.

[0303] Fig. 20 The base station (or AP) 2000 includes, for example, illumination of visible light such as LED, or a light source, or a lamp. First, the operation of the portion related to illumination of visible light such as LED, or a light source, or a lamp will be described.

[0304] Transmitter 102 receives information 1001-1 on SSID, information 1001-2 on encryption key, and data 1002 as input, generates a (light) modulated signal based on these input signals, and outputs modulated signal 103. Modulated signal 103 is then transmitted from light source 104, for example.

[0305] Next, the information 1001 - 1 related to the SSID and the information 1001 - 2 related to the encryption key will be described.

[0306] First, the information 1001 - 1 related to the SSID will be described.

[0307] The information 1001-1 related to the SSID is shown Fig. 20 The information of the SSID of the base station (or AP) 2000, for example, the wireless device 2001 using radio waves. That is, the "part related to the illumination or light source or lamp of visible light such as LED" can provide the terminal with the ability to access the wireless device 2001 as the access destination through a secure wireless network. The effect that can be obtained is that Fig. 20 The terminal 1050 is able to securely obtain information from the wireless device 2001.

[0308] Furthermore, the portion of the base station 200 related to the illumination, light source, or lamp of visible light such as LED can limit the terminals that access the wireless device 2001 to terminals located in a space that can receive the optical signal sent (irradiated) by the portion of the base station 200 related to the illumination, light source, or lamp of visible light such as LED. In addition, when the terminal 1050 receives the optical signal sent in a predetermined manner, it can determine whether the notified SSID is the SSID of a secure base station, and can also perform a determination process that it is considered secure. For example, the portion of the base station 200 related to the illumination, light source, or lamp of visible light such as LED can include a specified identifier in the optical signal and send it, and the terminal determines whether the SSID notified based on the received identifier is the SSID of a secure base station.

[0309] In addition, Fig. 20 Although only the base station (or AP) 2000 is shown, for example, base stations (or APs) other than the base station (or AP) 2000 may exist. Fig. 20 The terminal 1050 accesses the base station (or AP) 2000 to obtain information.

[0310] The information 1001-2 related to the encryption key is Fig. 20 The terminal 1050 is used to communicate with Fig. 20 The information related to the encryption key required for the wireless device 2001 to communicate, Fig. 20The terminal 1050 obtains the information from a part related to illumination or light source or lamp of visible light such as LED, thereby enabling encrypted communication with the wireless device 2001. Fig. 20 The terminal 1050 receives a modulated signal sent by a part of the base station 200 related to illumination or light source or lamp of visible light such as LED.

[0311] In addition, about Fig. 20 Terminal 1050, for Figure 1 Terminal 150, Fig.10 The components of terminal 1050 that perform the same action are given the same labels.

[0312] The light receiving unit 151 such as an image sensor such as CMOS or organic CMOS provided in the terminal 1050 receives a modulated signal sent by a part related to illumination or light source or lamp of visible light such as LED in the base station 200. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0313] The data analysis unit 155 receives the received data 154 as input, and outputs, based on the received data, for example, information 1051 of the SSID of the wireless device 2001 of the base station to be connected, and information 1052 of an encryption key used to communicate with the wireless device 2001 of the base station to be connected. For example, in a wireless LAN (Local Area Network), encryption methods include WEP (Wired Equivalent Privacy), WPA (Wi-Fi Protected Access), and WPA2 (Wi-Fi Protected Access 2) (PSK (Pre-Shared Key) mode, EAP (Extended Authentication Protocol) mode). In addition, the encryption method is not limited to this.

[0314] The display unit 157 receives the SSID information 1051 and the encryption key information 1052 as input, and displays, for example, the SSID and encryption key of the communication partner to which the wireless device 453 of the terminal is to access. (This display is named the first display in this embodiment.)

[0315] For example, after the 1st display, Fig. 20The wireless device 453 of the terminal 1050 takes the SSID information 1051 and the encryption key information 1052 as input, and establishes a connection with the wireless device 2001 of the base station (or AP) 2000 (for example, the connection uses radio waves). At this time, the wireless device 2001 of the base station (or AP) 2000 also establishes a connection with the wireless device 2001 of the base station (or AP) 2000. Fig. 20 When communicating with the wireless device 453 of the terminal 1050, for example, a modulated signal is sent using radio waves.

[0316] after, Fig. 20 The wireless device 453 of the terminal 1050 receives the data 1053 and the control signal 1054 as input, modulates the data 1053 according to the control of the control signal 1054, and transmits the modulated signal as an electric wave. Then, for example, the wireless device 2001 of the base station (or AP) 2000 transmits data to the network (471) and receives data from the network (472). Then, for example, the wireless device 2001 of the base station (or AP) 2000 transmits data to the network (471) and receives data from the network (472). Fig. 20 The terminal 1050 sends the modulated signal as an electric wave. Fig. 20 The wireless device 453 included in the terminal 1050 performs processing such as demodulation and error correction decoding on the modulated signal received as a radio wave, and obtains the received data 1056. The display unit 157 displays the received data 1056.

[0317] Fig.11 Shows Fig. 20 An example of a frame format of a modulated signal transmitted by the transmitting unit 102 of the base station (or AP) 2000 and the light source 104. Fig.11 In the figure, the horizontal axis is time, for Figure 2 , Figure 6 The same symbols are assigned the same reference numerals, and description thereof is omitted.

[0318] The code element 600-1 associated with the SSID is used to Fig. 20 The code element 1001-1 related to the SSID is used to send the code element 1101 related to the encryption key. Fig. 20 Data symbol 1102 is a symbol for transmitting data 1002.

[0319] The transmitter 102 and the light source 104 of the base station (or AP) 2000 transmit the preamble 201, the control information symbol 202, the symbol 600-1 related to the SSID, the symbol 1101 related to the encryption key, and the data symbol 1102. Fig. 20 The sending unit 102 of the base station (or AP) 2000 and the light source 104 may also send a signal including Fig.11 Furthermore, the order in which the symbols are sent and the frame format are not affected by Fig.11 Limited by the composition.

[0320] Fig.12 Shows Fig. 20 An example of a frame format of a modulated signal transmitted by the wireless device 453 of the terminal 1050. Fig.12 In the example, the horizontal axis is time. Fig.12 As shown, Fig. 20 The wireless device 453 of the terminal 1050 sends, for example, a preamble code 1201, and then sends a control information code element 1202 and an information code element 1203.

[0321] At this time, the leading code 1201 is received Fig. 20 The modulated signal sent by the wireless device 453 of the terminal 1050 is a codeword used by the wireless device 2001 of the base station (or AP) 2000, for example, when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0322] The control information codeword 1202 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, information related to the transmission method, etc. The wireless device 2001 of the base station (or AP) 2000 implements demodulation of the modulated signal based on the information contained in the control information codeword 1202.

[0323] Information symbol 1203 is used to Fig. 20 The wireless device 453 of the terminal 1050 transmits the codeword for data.

[0324] in addition, Fig. 20 The wireless device 453 of the terminal 1050 may send a message including Fig.12 The order in which the symbols are transmitted and the frame format are not affected by the codewords other than the codewords described in the text (for example, a frame including a pilot codeword (reference codeword) in the middle of an information codeword). Fig.12 Therefore, in Fig.12 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0325] Figure 7 Shows Fig. 20 An example of a frame format of a modulated signal transmitted by the wireless device 2001. Figure 7 In the example, the horizontal axis is time. Figure 7 As shown, the base station 470 sends a preamble code 701, and then sends a control information code element 702 and an information code element 703.

[0326] At this time, the preamble 701 is used to receive Fig. 20 The modulated signal transmitted by the wireless device 2001 is Fig. 20 The wireless device 453 of the terminal 1050 performs codewords when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0327] The control information symbol 702 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. Fig. 20 The wireless device 453 of the terminal 1050 performs demodulation of the modulated signal according to the information of the code element.

[0328] Information symbol 703 is used to Fig. 20 The wireless device 2001 transmits codewords for data transmission.

[0329] in addition, Fig. 20 The wireless device 2001 of the base station 2000 may also send a signal including Figure 7 The order in which the symbols are transmitted and the frame format are not affected by the codewords recorded in the codewords (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword). Figure 7 Therefore, in Figure 7 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0330] It can be considered that, for example, the part of the base station 200 related to the illumination or light source or lamp of visible light such as LED sends Fig.11 A method of transmitting a modulated signal in a frame format at a regular timing, such as repeatedly. Based on this, multiple terminals can implement the above-described operation.

[0331] Fig.21 It shows the above Fig. 20 A flowchart of an example of processing performed by "a part related to illumination or light source or lamp of visible light such as LED", "terminal 1050", and "wireless device 2001 of base station (or AP)".

[0332] First, if Fig.21 As shown in 1301, Fig. 20 Parts related to lighting or light sources or lamps with visible light such as LEDs Fig.11 The modulated signal in the frame format is sent.

[0333] ·So, if Fig.21 As shown in 1302, receiving Fig. 20A modulated signal sent by a part related to illumination or light source or lamp of visible light such as LED, Fig. 20 The terminal 1050 obtains the SSID of the base station that the terminal 1050 is going to access.

[0334] At the same time, Fig.21 As shown in 1303, Fig. 20 The terminal 1050 obtains an encryption key used in communication with the base station 470 that the terminal is about to access.

[0335] ·then, Fig. 20 The terminal 1050 executes Fig. 20 The wireless device 2001 of the base station 2000 is connected via radio waves (1304).

[0336] ·pass Fig. 20 The response of the wireless device 2001 of the base station 2000 is as follows: Fig.21 As shown in 1305, Fig. 20 The terminal 1050 ends with Fig. 20 The wireless device 2001 of the base station 2000 is connected.

[0337] ·So, if Fig.21 As shown in 1306, Fig. 20 The terminal 1050 is targeted at Fig. 20 The wireless device 2001 of the base station 2000 transmits the connection destination information to the wireless device 2001 of the base station 2000 by radio waves. Fig. 20 A wireless device 2001 of a base station 2000.

[0338] · In this way, Fig.21 As shown in 1307, Fig. 20 The wireless device 2001 of the base station 2000 obtains the Fig. 20 The terminal 1050 sends the information.

[0339] ·So, if Fig.21 As shown in 1308, Fig. 20 The wireless device 2001 of the base station 2000 transmits the acquired information to the Fig. 20 The terminal 1050 sends, Fig. 20 The terminal 1050 obtains the information.

[0340] Fig. 20 Terminal 1050, for example, when necessary, via Fig. 20 The wireless device 2001 of the base station 2000 obtains the required information from the network.

[0341] As described above, based on the SSID information and encryption key information sent by the part of the base station related to the illumination or light source or lamp of visible light such as LED, the terminal connects to the wireless device of the base station (or AP) to obtain information, and the effect that can be obtained is that the information can be obtained safely through the base station (or AP) that ensures security. This is because, in the case of obtaining information based on the modulated signal of visible light, since it is visible light, the user can easily determine whether the information source is safe.

[0342] For example, when the SSID is obtained from the modulated signal of the radio wave transmitted by the wireless LAN, the user cannot easily identify the device that transmitted the radio wave. Therefore, from the perspective of ensuring the security of information, it is better to obtain the SSID by visible light communication.

[0343] In addition, in the present embodiment, although a case is described in which a portion of a base station related to illumination or light source or lamp for visible light such as LED sends information about an encryption key, for example, when the wireless device of the base station (or AP) does not perform communication encrypted using an encryption key, a portion of a base station related to illumination or light source or lamp for visible light such as LED does not send information about an encryption key, but only sends information related to the SSID. In this way, the same implementation can be performed simply by deleting the configuration related to the encryption key.

[0344] So, if Fig. 20 As shown in FIG. 1 , the SSID and encryption key of the wireless device 2001 of the base station 2000 may be rewritable. Fig. 20 In the example, the wireless device 2001 receives information 1001-1 related to the SSID and information 1001-2 related to the encryption key as input. The wireless device 2001 of the base station 2000 rewrites the SSID and the encryption key by using the information 1001-1 related to the SSID and information 1001-2 related to the encryption key as input. In this way, the security of the communication between the terminal and the wireless device 2001 of the base station 2000 can be further ensured. (However, in Fig. 20 In the example, the wireless device 2001 of the base station 2000 has a function of rewriting the SSID and the encryption key, but may be configured without such a function.

[0345] Furthermore, the structure of the parts related to the illumination or light source or lamp of visible light such as LED in the base station is not limited to Fig. 20 The configuration shown in the figure is not limited to Fig. 20 The configuration shown in the figure is also the same as the connection destination and configuration method of the wireless device of the base station. Fig. 20 limited.

[0346] Therefore, in this embodiment, Fig. 20 Although the case where one base station (or AP) is configured is described, there may be multiple (secure) base stations (or APs) whose wireless devices the terminal can access (in addition, the wireless devices of these base stations and the terminal use radio waves to transmit and receive modulated signals). In this case, Fig. 20 The code element related to the SSID sent by the part related to the illumination or light source or lamp of visible light such as LED may include the information of the SSID of each of the wireless devices of the multiple base stations (or APs) existing therein. Fig. 20 The code element related to the encryption key sent by the part related to the illumination or light source or lamp of visible light such as LED may include the information of the encryption key used when connecting to each base station of the wireless device of these multiple base stations (or APs) existing. Fig. 20 The terminal 1050 can select (for example, through radio waves) a wireless device of a base station (or AP) to connect wirelessly (or can connect with wireless devices of multiple base stations (or APs) based on information on SSIDs of wireless devices of multiple existing base stations and information on encryption keys.

[0347] For example, suppose there are three base stations (or APs) equipped with wireless devices. They are named wireless device #A, wireless device #B, and wireless device #C. Therefore, the SSID of wireless device #A is set to "abcdef", the SSID of wireless device #B is set to "ghijk", the SSID of wireless device #C is set to "pqrstu", the encryption key used to connect to wireless device #A is set to "123", the encryption key used to connect to wireless device #B is set to "456", and the encryption key used to connect to wireless device #C is set to "789".

[0348] Thus, the modulation signal sent by the part related to the illumination or light source or lamp of visible light such as LED in the base station 200 is Fig.11 The SSID-related symbol 600-1 in the frame format includes information related to "SSID "abcdef" of wireless device #A", "SSID "ghijk" of wireless device #B", and "SSID "pqrstu" of wireless device #C". Thus, Fig.11 The code element 1101 related to the encryption key in the frame format includes information related to "the encryption key "123" for connecting with wireless device #A", "the encryption key "456" for connecting with wireless device #B", and "the encryption key "789" for connecting with wireless device #C".

[0349] then, Fig. 20Terminal 1050 receives symbol 600-1 related to SSID, obtains information about "SSID "abcdef" of wireless device #A", "SSID "ghijk" of wireless device #B", and "SSID "pqrstu" of wireless device #C", receives symbol 1101 related to encryption key, obtains information about "encryption key "123" for connecting to wireless device #A", "encryption key "456" for connecting to wireless device #B", and "encryption key "789" for connecting to wireless device #C". Thus, based on this information, Fig. 20 The terminal 1050 selects a base station (or AP) for wireless connection (eg, via radio waves) and establishes the connection.

[0350] Furthermore, as shown in the present embodiment, by utilizing a light source such as an LED, a wireless device of a base station to which the terminal is to access is set, accordingly, a modulation signal for wireless sent at the terminal does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, and a modulation signal sent at the base station does not require a mode for performing a special setting, wherein the special setting refers to a procedure required for wirelessly connecting the terminal to the base station, thereby achieving an effect of improving the data transmission efficiency of wireless communications.

[0351] Therefore, as described previously, the encryption key can be an encryption key for the SSID of the wireless LAN, or can be an encryption key used to limit the connection form, service form, connection range of the network, etc. (that is, the encryption key can be imported when certain restrictions are desired).

[0352] (Implementation method 7) [There are multiple base stations, and access control is performed.]

[0353] Fig. 22 An example of the configuration of the communication system in this embodiment is shown. Fig. 22 The communication system includes, for example: a device 1000 having a light source of visible light such as an LED, or a lighting device, or a lamp; a terminal 1050; and base stations such as 470-1, 470-2, and 470-3 that communicate with the terminal 1050. Fig. 22 In Figure 1 , Figure 4 , Fig.10 The same actions are given the same number.

[0354] Fig. 22 The device 1000 includes, for example, a visible light illumination such as an LED, or a light source, or a lamp. In addition, the device 1000 is named as the "fifth device" in this embodiment. In addition, Fig. 22The communication between the wireless device 453 and the base station #1 of 470-1, the communication between the wireless device 453 and the base station #2 of 470-2, and the communication between the wireless device 453 and the base station # of 470-3 are performed, for example, via radio waves.

[0355] exist Fig. 22 In the fifth device 1000, the transmitter 102 receives information 1001-1 related to the SSID, information 1001-2 related to the encryption key, and data 1002 as input, generates a (light) modulated signal based on these input signals, and outputs a modulated signal 103. Then, the modulated signal 103 is transmitted from the light source 104, for example.

[0356] Next, the information 1001 - 1 related to the SSID and the information 1001 - 2 related to the encryption key will be described.

[0357] First, the information 1001 - 1 related to the SSID will be described.

[0358] The information 1001-1 related to the SSID is, for example, Fig. 22 The information of the SSID of the base station (or AP) 470-1, the information of the SSID of the base station (or AP) 470-2, and the information of the SSID of the base station (or AP) 470-3 are displayed. In addition, as an example, the base stations (or APs) 470-1, 470-2, and 470-3 transmit modulated signals using radio waves and receive modulated signals of radio waves. That is, the fifth device 1000 can provide the terminal with access to the base stations 470-1, 470-2, and 470-3 as secure access destinations. Accordingly, the effect that can be obtained is, Fig. 22 The terminal 1050 can securely obtain information from base stations (or APs) 470-1, 470-2, 470-3.

[0359] In addition, the device 1000 can limit the terminals accessing the base stations 470-1, 470-2, and 470-3 to terminals in a space that can receive the optical signal sent (radiated) by the device 1000. In addition, when the terminal 1050 receives the optical signal sent in a predetermined manner, it can determine whether the notified SSID is the SSID of a secure base station, and can also perform a determination process whether it is secure. For example, the device 1000 includes a specified identifier in the optical signal and sends it, and the terminal can determine whether the SSID notified based on the received identifier is the SSID of a secure base station.

[0360] In addition, Fig. 22Although base stations (or APs) 470-1, 470-2, and 470-3 are shown, base stations (or APs) other than base stations (or APs) 470-1, 470-2, and 470-3 may exist, for example.

[0361] The information 1001-2 related to the encryption key is Fig. 22 The terminal 1050 and Fig. 22 The information related to the encryption key required for the base stations (or APs) 470-1, 470-2, and 470-3 to communicate, Fig. 22 The terminal 1050 is connected via Fig. 22 The fifth device 1000 obtains the information, thereby enabling encrypted communication between "the terminal and the base station (or AP) 470-1", "the terminal and the base station (or AP) 470-2", and "the terminal and the base station (or AP) 470-3".

[0362] Fig. 22 The terminal 1050 receives the modulated signal sent by the fifth device 1000. Fig. 22 Terminal 1050, for Figure 1 Terminal 150, Figure 4 The components of terminal 450 that perform the same operation are given the same reference numerals.

[0363] The light receiving unit 151 of the terminal 1050, such as a CMOS or organic CMOS image sensor, receives the modulated signal sent by the fifth device 1000. Then, the receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as input, performs processing such as demodulation and error correction decoding of the received signal, and outputs received data 154.

[0364] The data analysis unit 155 receives the received data 154 as input, and outputs, based on the received data, for example, information 1051 of the SSID of the base station (470-1, 470-2, 470-3) to be connected, and information 1052 of an encryption key used to communicate with the base station (470-1, 470-2, 470-3) to be connected. For example, in a wireless LAN (Local Area Network), encryption methods include WEP (Wired Equivalent Privacy), WPA (Wi-Fi Protected Access), and WPA2 (Wi-Fi Protected Access 2) (PSK (Pre-Shared Key) mode, EAP (Extended Authentication Protocol) mode). In addition, the encryption method is not limited to this.

[0365] The display unit 157 receives the SSID information 1051 and the encryption key information 1052 as input, and displays, for example, the SSID and encryption key of the communication partner to which the wireless device 453 of the terminal is to access. (This display is referred to as the first display in this embodiment.)

[0366] For example, after the 1st display, Fig. 22 The wireless device 453 of the terminal 1050 takes the SSID information 1051 and the encryption key information 1052 as input, and establishes a connection with one of the base stations (or APs) 470-1, 470-2, and 470-3 (for example, the connection is made via radio waves). At this time, the connected base station also connects to Fig. 22 When communicating with the wireless device 453 of the terminal 1050, for example, a modulated signal is sent using radio waves.

[0367] after, Fig. 22 The wireless device 453 of the terminal 1050 takes the data 1053 and the control signal 1054 as input, modulates the data 1053 according to the control of the control signal 1054, and transmits the modulated signal as an electric wave.

[0368] Then, for example, the connected base station (or AP) sends data to the network (any one of 471-1, 471-2, 471-3) and receives data from the network (any one of 472-1, 472-2, 472-3). Fig. 22 The terminal 1050 sends the modulated signal as an electric wave.

[0369] Fig. 22 The wireless device 453 included in the terminal 1050 performs processing such as demodulation and error correction decoding on the modulated signal received as a radio wave, and obtains the received data 1056. The display unit 157 displays the received data 1056.

[0370] As Fig. 22 The modulated signal sent by the fifth device 1000 is Fig. 22 There are 3 frame formats in this case. Fig.23 One of the three frame formats is shown, 2300-1 Frame #1, Fig.24 One of the three frame formats is shown, 2300-2 frame format #2, Fig.25 One of the 3 frame formats 2300-3 frame format #3 is shown.

[0371] Fig.23 Shows Fig. 22 This is an example of the structure of the modulated signal 2300-1 frame #1 transmitted by the fifth device 1000. Fig.23In the figure, the horizontal axis is time. Figure 2 , Fig.11 The same code elements are given the same reference numerals and their descriptions are omitted. Fig.23 Frame #1 of 2300-1 is used for Fig. 22 The SSID information of base station #1 of 470-1 and Fig. 22 A frame that sends information about the encryption key of base station #1 of 470-1 (the encryption key used to access base station #1 of 470-1).

[0372] Fig.23 The SSID-related code element 2301-1 is used to Fig. 22 The information 1001-1 related to the SSID in the codeword is sent. Fig.23 The SSID-related code element 2301-1 is used for Fig. 22 5th device 1000 pairs Fig. 22 The codeword sent by the SSID of base station #1 of 470-1.

[0373] Fig.23 The code element 2302-1 in the encryption key is used to Fig. 22 The information 1001-2 related to the encryption key is sent as a symbol. And, Fig.23 The code element 2302-1 in the encryption key is used to Fig. 22 5th device 1000 pairs Fig. 22 The codeword used to send the encryption key of base station #1 of 470-1 (the encryption key used to access base station #1 of 470-1).

[0374] The fifth device 1000 transmits the preamble 201, the control information symbol 202, the symbol 2301-1 related to the SSID, the symbol 2302-1 related to the encryption key, and the data symbol 1102. Fig. 22 The fifth device 1000 may also send a message including Fig.23 The order in which the symbols are transmitted and the structure of 2300-1 frame #1 are not affected by Fig.23 Limited by the composition.

[0375] Fig.24 Shows Fig. 22 This is an example of the structure of the modulated signal 2300-2 frame #2 transmitted by the fifth device 1000. Fig.24 In the figure, the horizontal axis is time. Figure 2 , Fig.11 The same code elements are given the same reference numerals and their descriptions are omitted. Fig.24 Frame #2 of 2300-2 is used for Fig. 22 The SSID information of base station #2 of 470-2 and Fig. 22 A frame that sends information about the encryption key of base station #2 of 470-2 (the encryption key used to access base station #2 of 470-2).

[0376] Fig.24 The code element 2301-2 related to the SSID is used to Fig. 22 The information 1001-1 related to the SSID in the code element is sent. And, Fig.24 The SSID-related code element 2301-2 is used for Fig. 22 5th device 1000 pairs Fig. 22 The codeword sent by the SSID of base station #2 of 470-2.

[0377] Fig.24 The code element 2302-2 in the encryption key is used to Fig. 22 The information 1001-2 related to the encryption key is sent as a symbol. And, Fig.24 The code element 2302-2 in the encryption key is used to Fig. 22 5th device 1000 pairs Fig. 22 The codeword used to send the encryption key of base station #2 of 470-2 (the encryption key used to access base station #2 of 470-2).

[0378] The fifth device 1000 transmits the preamble 201, the control information symbol 202, the symbol 2301-2 related to the SSID, the symbol 2302-2 related to the encryption key, and the data symbol 1102. Fig. 22 The fifth device 1000 may also send a message including Fig.24 The order in which the symbols are transmitted and the structure of the 2300-2 frame #2 are not affected by Fig.24 Limited by the composition.

[0379] Fig.25 Shows Fig. 22 This is an example of the structure of the modulated signal 2300-3 frame #3 transmitted by the fifth device 1000. Fig.25 In the figure, the horizontal axis is time. Figure 2 , Fig.11 The same symbols are assigned to the same code elements, and their descriptions are omitted. Fig.25 Frame #3 of 2300-3 is used for Fig. 22 The SSID information of base station #3 of 470-3 and Fig. 22 A frame that sends information about the encryption key of base station #3 of 470-3 (the encryption key used to access base station #3 of 470-3).

[0380] Fig.25 Shows Fig. 22 This is an example of the structure of the modulated signal 2300-3 frame #3 transmitted by the fifth device 1000. Fig.25 In the figure, the horizontal axis is time. Figure 2 , Fig.11 The same code elements are given the same reference numerals and their descriptions are omitted. Fig.25 Frame #3 of 2300-3 is used for Fig. 22 The SSID information of base station #3 of 470-3 and Fig. 22 A frame that sends information about the encryption key of base station #3 of 470-3 (the encryption key used to access base station #3 of 470-3).

[0381] Fig.25 The SSID-related code element 2301-3 is used to Fig. 22 The information 1001-1 related to the SSID in the code element is sent. And, Fig.25 The SSID-related code element 2301-3 is used for Fig. 22 5th device 1000 pairs Fig. 22 The codeword sent by the SSID of base station #3 of 470-3.

[0382] Fig.25 The code element 2302-3 in the encryption key is used to Fig. 22 The information 1001-2 related to the encryption key is sent as a symbol. And, Fig.25 The code element 2302-3 in the encryption key is used to Fig. 22 5th device 1000 pairs Fig. 22 The codeword used to send the encryption key of base station #3 of 470-3 (the encryption key used to access base station #3 of 470-3).

[0383] The fifth device 1000 transmits the preamble 201, the control information symbol 202, the symbol 2301-3 related to the SSID, the symbol 2302-3 related to the encryption key, and the data symbol 1102. Fig. 22 The fifth device 1000 may also include Fig.25 The order in which the symbols are transmitted and the composition of the 2300-3 frame #3 are not affected by the Fig.25 Limited by the composition.

[0384] Fig.26 Shows Fig. 22 The 5th device 1000 pairs of " Fig.23Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 An example of a transmission method when sending a frame #3 of 2300-3 is shown in FIG. Fig.26 , the horizontal axis is time.

[0385] exist Fig.26 In "Frame #1 Group Transmission" 2601-1, 2601-2, more than one Fig.23 In addition, in "Frame #2 Group Transmission" 2602-1, 2602-2, more than one Fig.24 In the "Frame #3 Group Transmission" 2603-1, 2603-2, more than one Fig.25 Frame #3 of 2300-3.

[0386] The detailed description at this time will be given below.

[0387] It is described that "In "Frame #1 Group Transmission" 2601-1, 2601-2, more than one Fig.23 This point is explained in the frame #1 of 2300-1".

[0388] For example, when an image sensor such as CMOS or organic CMOS is used in the light receiving unit 151, it is possible to process the received signal in units of frames in a moving image or a still image. In addition, for example, in the case of a moving image, when it is described as "4K30p", it means that the number of pixels in one frame is 3840×2160, and the number of frames per second is 30.

[0389] However, in Fig. 22 The fifth device 1000 pairs are configured as " Fig.23 Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 When the modulated signal of 2300-3 frame #3 is sent, Fig. 22 It is difficult for the terminal 1050 to select a base station to access from multiple base stations.

[0390] Therefore, it was proposed Fig.26 The frame format shown.

[0391] Method 1-1:

[0392] As the method 1-1, since there are multiple Fig.23Therefore, the time interval occupied by the "frame #1 group transmission" becomes longer than the frame in the moving image or still image.

[0393] so, Fig. 22 The terminal 1050 can prevent the presence of " Fig.23 Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 The modulated signal of 2300-3 frame #3 is as follows: Fig. 22 The terminal 1050 can easily select a base station to access from multiple base stations.

[0394] Method 2-1:

[0395] As method 2-1, Fig.23 The time interval occupied by the frame #1 of 2300-1 becomes longer than the frame in the moving image or the still image. Fig.23 The code element 2301-1 related to the SSID includes multiple "information of the SSID of base station #1" ("information of the SSID of base station #1" is repeatedly included), and the code element 2302-1 related to the encryption key includes multiple "information of the encryption key of base station #1 (information of the encryption key used to connect to base station #1)" ("information of the encryption key of base station #1 (information of the encryption key of base station #1 (information of the encryption key used to connect to base station #1)" is repeatedly included).

[0396] so, Fig. 22 The terminal 1050 can prevent the presence of " Fig.23 Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 The modulated signal of 2300-3 frame #3 is Fig. 22 The terminal 1050 can easily select a base station to access from multiple base stations.

[0397] Similarly, "Frame #2 group transmission" 2602-1, 2602-2 may be configured as follows.

[0398] Method 1-2:

[0399] As the method 1-2, since there are multiple Fig.24 Therefore, the time interval occupied by the "frame #2 group transmission" becomes longer than the frame in the moving image or still image.

[0400] Method 2-2:

[0401] As method 2-2, Fig.24 The time interval occupied by the frame #2 of 2300-2 becomes longer than the frame in the moving image or the still image. Fig.24 The code element 2301-2 related to the SSID includes multiple "information of the SSID of base station #2" ("information of the SSID of base station #2" is repeatedly included), and the code element 2302-2 related to the encryption key includes multiple "information of the encryption key of base station #2 (information of the encryption key used to connect to base station #2)" ("information of the encryption key of base station #2 (information of the encryption key used to connect to base station #2)" is repeatedly included).

[0402] Similarly, "Frame #3 Group Transmission" 2603-1, 2603-2 may be constructed as follows.

[0403] Methods 1-3:

[0404] As the method 1-3, since "Frame #3 Group Transmission" 2603-1, 2603-2 include multiple Fig.25 Therefore, the time interval occupied by the "frame #3 group transmission" becomes longer than the frame in the moving image or still image.

[0405] Method 2-3:

[0406] As the second and third methods, Fig.25 The time interval occupied by the frame #3 of 2300-3 becomes longer than the frame in the moving image or the still image. Fig.25 The code element 2301-3 related to the SSID includes multiple "information of the SSID of base station #3" ("information of the SSID of base station #3" is repeatedly included), and the code element 2302-3 related to the encryption key includes multiple "information of the encryption key of base station #3 (information of the encryption key used to connect to base station #3)" ("information of the encryption key of base station #3 (information of the encryption key used to connect to base station #3)" is repeatedly included).

[0407] Next, from Figure 23 to Figure 26 shown Fig. 22 The effect when the 5th device 1000 sends a frame is described.

[0408] consider Fig. 27The area of ​​2700 is configured in ○2701-1, 2701-2, 2701-3, 2701-4, 2701-5, 2701-6, 2701-7, 2701-8, 2701-8, 2701-9, 2701-10 Fig. 22 The fifth device 1000 in ◎2702-1 is configured Fig. 22 The base station #1 of 470-1 is configured in ◎2702-2 Fig. 22 The base station #2 of 470-2 is configured in ◎2702-3 Fig. 22 Base station #3 of 470-3.

[0409] Furthermore, for example, there are 99 units equipped with Fig. 22 The terminal consists of 1050.

[0410] At this time, for example, the 5th device 2701-5, 2701-10 also sends the SSID information of the base station #3 of 470-3, and sends the encryption key information for accessing the base station #3 of 470-3 (this is because the nearest base station to the 5th device 2701-5, 2701-10 is the base station #3 of 470-3).

[0411] In this way, Fig. 22 The 1050 terminals consist of 99 units. Fig. 22 The base station #3 of 470-3 is connected to Fig. 22 The 470-3 base station #3 is difficult to access Fig. 22 The possibility of the existence of the constituent terminal of 1050 is high.

[0412] If we take this into account, by having 99 Fig. 22 The terminal control of the 1050 structure is to be able to send Fig. 22 Base station #1 (2702-1) of 470-1, Fig. 22 By accessing base station #2 (2702-2) of 470-2 and base station #3 (2702-3) of 470-3, the effect of reducing the number of terminals that have difficulty accessing the base stations can be achieved as described above.

[0413] As in this embodiment Figure 23 to Figure 26 As shown, in Fig. 22 When the fifth device 1000 sends a frame, Fig. 22 The 99 terminals of 1050 Fig. 22 The timing of access of the fifth device 1000 is generally different, so it becomes "having Fig. 22 The 99 terminals of the 1050 are controlled to provide Fig. 22Base station #1 (2702-1) of 470-1, Fig. 22 Base station #2 (2702-2) of 470-2 and base station #3 (2702-3) of 470-3 are accessed". Therefore, as described above, the effect of reducing the number of terminals that have difficulty accessing the base station can be achieved. That is, the effect of avoiding the concentration of access from multiple terminals on a certain base station can be achieved.

[0414] In addition, Fig.26 Although it shows Fig. 22 The 5th device 1000 pairs of " Fig.23 Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 This is an example of a transmission method when sending frame #3 of 2300-3. However, Fig. 22 The 5th device 1000 pairs of " Fig.23 Frame #1 of 2300-1"," Fig.24 Frame #2 of 2300-2"," Fig.25 The sending method when sending the frame #3 of 2300-3 is not limited to this.

[0415] For example, in Fig.26 Although the structure of repeatedly sending in the order of "frame #1 group sending", "frame #2 group sending" and "frame #3 group sending" is shown in FIG, "frame #1 group sending", "frame #2 group sending" and "frame #3 group sending" may not be the same. Fig.26 For example, the "frame #1 group transmission", "frame #2 group transmission" and "frame #3 group transmission" can be performed randomly in time, or the same as Fig.26 Different regular sequences are used to perform "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission". Fig. 22 The fifth device 1000 can at least send "Frame #1 Group Sending", "Frame #2 Group Sending" and "Frame #3 Group Sending". For example, when the fifth device 1000 randomly sends "Frame #1 Group Sending", "Frame #2 Group Sending" and "Frame #3 Group Sending" in time, a random number can be generated at an arbitrary timing and the frame group specified by the random number can be sent. In addition, the use of random numbers is only an example and is not limited to this.

[0416] And, in Fig.26 Although "Frame #1 Group Send", "Frame #2 Group Send" and "Frame #3 Group Send" are sent continuously, they do not have to be sent continuously. Fig.26 It is possible that a time interval is left between the frame #1 group 2601-1 and the frame #2 group 2602-2.

[0417] And, although in Fig.26 The structure of is only "frame #1 group transmission", "frame #2 group transmission" and "frame #3 group transmission", but other symbols and other frames may also exist. Fig.26 as well as Fig. 22 Although the number of base stations is shown as three, the number of base stations is not limited to this. As long as there are two or more base stations, the base stations can perform the same operation as when there are three base stations. Therefore, for example, when there are N base stations (N is an integer greater than 2), when performing Fig.26 When sending as shown, there is "frame #k group sending". In addition, k is an integer greater than 1 and less than N. Therefore, the "frame #k group sending" includes code elements related to the SSID (information of the SSID of the base station #k) and code elements related to the encryption key (information of the encryption key used for access to the base station #k).

[0418] Fig.12 Shows Fig. 22 An example of a frame format of a modulated signal transmitted by the wireless device 453 of the terminal 1050. Fig.12 The horizontal axis is time. Fig.12 As shown, Fig. 22 For example, after sending the preamble 1201, the wireless device 453 of the terminal 1050 sends the control information codeword 1202 and the information codeword 1203.

[0419] At this time, the leading code 1201 is received Fig. 22 The modulated signal sent by the wireless device 453 of the terminal 1050 is a codeword used by the base stations (or APs) 470-1, 470-2, and 470-3, for example, when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0420] The control information codeword 1202 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. The base stations (or APs) 470-1, 470-2, and 470-3 perform demodulation of the modulated signal based on the information included in the control information codeword 1202.

[0421] Information symbol 1203 is used to Fig. 22 The wireless device 453 of the terminal 1050 transmits the codeword for data.

[0422] in addition, Fig. 22 The wireless device 453 of the terminal 1050 may also send a message including Fig.12The order in which the symbols are transmitted and the frame format are not affected by the codewords recorded in the codewords (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword). Fig.12 In addition, Fig.12 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0423] Figure 7 Shows Fig. 22 An example of a frame format of a modulated signal transmitted by base stations 470-1, 470-2, and 470-3. Figure 7 In the example, the horizontal axis is time. Figure 7 As shown, the base stations 470 - 1 , 470 - 2 , and 470 - 3 , for example, send the control information symbol 702 and the information symbol 703 after sending the preamble code 701 .

[0424] At this time, the preamble 701 is used to receive the modulated signal sent by the base stations 470-1, 470-2, and 470-3. Fig. 22 The wireless device 453 of the terminal 1050 performs codewords when performing signal detection, time synchronization, frame synchronization, frequency synchronization, frequency offset estimation, etc.

[0425] The control information symbol 702 includes, for example, data such as the error correction coding method used when generating the modulated signal, information related to the modulation method, information related to the frame format, and information related to the transmission method. Fig. 22 The wireless device 453 of the terminal 1050 performs demodulation of the modulated signal according to the information of the code element.

[0426] Information symbol 703 is used to Fig. 22 The base stations (or APs) 470-1, 470-2, and 470-3 transmit codewords for data transmission.

[0427] in addition, Fig. 22 The base stations (or APs) 470-1, 470-2, and 470-3 may also send a signal including Figure 7 The order in which the symbols are transmitted and the frame format are not affected by the codewords recorded in the codewords (for example, the frame including the pilot codeword (reference codeword) in the middle of the information codeword). Figure 7 And, in Figure 7 In the case of a multi-code signal, there may be multiple code elements in the frequency axis direction, that is, there may be code elements in multiple frequencies (multiple carriers).

[0428] Fig.28 It shows the above Fig. 22This is a flowchart of an example of a process performed by "fifth device 1000", "terminal 1050", and "base station #X (or AP #X)". In addition, X is 1, 2, or 3.

[0429] First, if Fig.28 As shown in 2801, Fig. 22 5th device 1000 pairs Fig.26 The modulated signal in the frame format is sent.

[0430] And, if Fig.28 As shown in 2802, receiving Fig. 22 The modulated signal transmitted by the 5th device 1000, Fig. 22 The terminal 1050 from Fig. 22 Base station #1 of 470-1, base station #2 of 470-2, and base station #3 of 470-3 select the base station that terminal 1050 is to access.

[0431] And, this point will be explained. Fig. 22 The terminal 1050 accesses the base station and receives Fig. 22 The modulated signal sent by the fifth device 1000. At this time, for example, in a certain frame of a moving image or a still image, Fig.26 Then, according to the obtained base station information (such as SSID), Fig. 22 The terminal 1050 determines the base station to be accessed by the terminal 1050 as Fig. 22 One of the base stations #1 of 470-1, the base station #2 of 470-2, and the base station #3 of 470-3.

[0432] For example, terminal 1050 selects the first received frame group transmission from "frame #1 group transmission", "frame #2 group transmission" and "frame #3 group transmission", and determines the base station that terminal 1050 will access based on the information of the base station of the frame group transmission (such as SSID).

[0433] ·like Fig.28 As shown in 2803, receiving Fig. 22 The modulated signal transmitted by the fifth device 1000, Fig. 22 Terminal 1050 obtains the SSID of base station #X that terminal 1050 is going to access.

[0434] At the same time, Fig.28 As shown in 2804, Fig. 22 The terminal 1050 obtains the encryption key used when communicating with the base station #X that the terminal is about to access.

[0435] ·then, Fig. 22The terminal 1050 implements connection with the base station #X via radio waves (2805).

[0436] · Response from base station #X, such as Fig.28 As shown in 2806, Fig. 22 Terminal 1050 ends the connection with base station #X.

[0437] ·So, if Fig.28 As shown in 2807, Fig. 22 The terminal 1050 uses radio waves to send the information of the connection destination to the base station #X.

[0438] · In this way, Fig.28 As shown in 2808, base station #X obtains from the network the Fig. 22 The terminal 1050 sends the information.

[0439] ·So, if Fig.28 As shown in 2809, base station #X uses radio waves to send the acquired information to Fig. 22 Terminal 1050, Fig. 22 The terminal 1050 obtains the information.

[0440] Fig. 22 For example, the terminal 1050 obtains the required information from the network via the base station #X when necessary.

[0441] As described above, based on the SSID information and encryption key information sent by the fifth device, the terminal connects to the base station (or AP) and obtains information, so that the information can be obtained safely via the base station (or AP) that ensures security. This is because, when the information is obtained from the modulated signal of visible light, since it is visible light, the user can easily determine whether the information source is safe.

[0442] For example, when the SSID is obtained from the modulated signal of the radio wave transmitted by the wireless LAN, it is not easy for the user to distinguish the device that transmits the radio wave. Therefore, from the perspective of ensuring the security of information, it is better to obtain the SSID by visible light communication.

[0443] In addition, although the present embodiment describes a case where the fifth device sends encryption key information, for example, when the base station (or AP) does not perform communication encrypted using an encryption key, the fifth device does not send encryption key information but only sends information related to the SSID. The same implementation can be achieved by deleting only the configuration related to the encryption key.

[0444] Furthermore, the configuration of the fifth device is not limited to Fig. 22 The configuration shown, and the configuration of the terminal is not limited to Fig. 22The configuration shown in the figure is the same for the connection destination and configuration method of base stations #1, #2, and #3, and is not affected by Fig. 22 limited.

[0445] Therefore, in the case of implementation shown in this embodiment, when there are a plurality of terminals in a certain area, it is possible to achieve an effect of reducing the number of terminals that have difficulty in accessing the base station.

[0446] In addition, Fig. 27 In the embodiment, the frame format of the modulated signal sent by the fifth device configured at ○2701-1, 2701-2, 2701-3, 2701-4, 2701-5, 2701-6, 2701-7, 2701-8, 2701-8, 2701-9, 2701-10 can be as follows Fig.26 In that case, all of them may be the same, or the modulated signals sent by the 5th device may be in different frame formats, and there may be multiple 5th devices that send modulated signals of the same frame formats.

[0447] Furthermore, in the present embodiment, although the terminal is connected to a base station or access point of a wireless LAN by wireless, the device connected to the terminal is not limited to the base station or access point of the wireless LAN and can be any device as long as it can be connected by wireless. For example, the device can be a base station such as a mobile phone, or can be a relay station. Furthermore, although the example of including SSID information in the modulated signal is described in the present embodiment, SSID is merely an example and is not limited to this. That is, the information contained in the modulated signal can be any information as long as it can identify a secure base station for the terminal to connect to. Furthermore, the same is true for the terminal, as long as it has Fig. 22 The device with the function of the terminal 1050 may be any device, for example, the vehicle itself, or a device mounted on the vehicle with a transceiver function.

[0448] [Summary of Embodiment 7]

[0449] As described above, the transmitting device in this embodiment is, for example, the above-mentioned device 1000, which includes a light source 104 and a transmitting unit 102. The transmitting unit 102 generates a modulation signal based on an input signal, and changes the brightness of the light source 104 according to the modulation signal, thereby transmitting the modulation signal as visible light from the light source 104. In addition, the modulation signal includes information related to SSIDs (service set identifiers) of multiple access points that are different from each other in a wireless LAN (Local Area Network).

[0450] Here, the modulated signal may include a frame group consisting of one or more frames corresponding to each of the plurality of access points, and each of the one or more frames included in the frame group includes information related to the SSID of the same access point corresponding to the frame group.

[0451] Furthermore, the time required for sending the frame group may be longer than the time required for a receiving device that receives the modulated signal to capture one frame of a moving image or a still image.

[0452] Alternatively, the modulated signal may include a frame corresponding to each of the plurality of access points, and the frame may include one or more pieces of information related to the SSID of the same access point corresponding to the frame. Furthermore, the time required to transmit the frame may be longer than the time required for a receiving device receiving the modulated signal to capture a frame of a moving image or a still image.

[0453] Furthermore, the transmitting unit 102 may transmit the frame groups corresponding to the respective access points in a random order in the time axis direction or the frequency axis direction.

[0454] Alternatively, the transmission unit 102 may transmit the frame group corresponding to each of the plurality of access points in a regular order in the time axis direction or the frequency axis direction.

[0455] In addition, the receiving device in this embodiment is, for example, a terminal 1050 that receives a modulated signal transmitted from the above-mentioned transmitting device. Specifically, the receiving device includes: a light receiving unit 151 that receives a modulated signal as visible light transmitted from the transmitting device; a data analysis unit 155 that analyzes data based on the modulated signal to output analysis information; and a wireless unit that uses radio waves to connect to an access point (Access Point) of a wireless LAN (Local Area Network) according to the analysis information. For example, the wireless unit is a wireless device 453. Here, the modulated signal includes information related to SSIDs (service set identifiers) of multiple access points that are different from each other in the wireless LAN. The data analysis unit 155 selects information related to an SSID from the information related to the SSIDs of multiple access points included in the modulated signal, and outputs the selected information related to the SSID as the above-mentioned analysis information. In addition, the wireless unit uses radio waves to connect to an access point corresponding to the information related to the SSID output from the data analysis unit 155 among the multiple access points.

[0456] Here, it may also be that the modulated signal includes a frame group consisting of one or more frames corresponding to each of the above-mentioned multiple access points, and each of the one or more frames included in the frame group includes information related to the SSID of the same access point corresponding to the frame group.

[0457] Furthermore, the time required for the light receiving unit 151 to receive the frame group is longer than the time required for the light receiving unit 151 to capture one frame of a moving image or a still image.

[0458] Alternatively, the modulated signal may include a frame corresponding to each of the plurality of access points, and the frame may include one or more pieces of information related to the SSID of the same access point corresponding to the frame. Furthermore, the time required for the light receiving unit 151 to receive the frame is longer than the time required for the light receiving unit 151 to capture one frame of a moving image or a still image.

[0459] Furthermore, the light receiving unit 151 may receive the frame groups corresponding to the plurality of access points in a random order in the time axis direction or the frequency axis direction.

[0460] Alternatively, the light receiving unit 151 may receive the frame group corresponding to each of the plurality of access points in a regular order in the time axis direction or the frequency axis direction.

[0461] Furthermore, the communication system in this embodiment includes a transmitting device and a plurality of access points of a wireless LAN (Local Area Network) that are different from each other. The transmitting device is, for example, device 1000, and the plurality of access points are, for example, composed of base station #1 of 470-1, base station #2 of 470-2, and base station #3 of 470-3. The transmitting device includes a light source 104 and a transmitting unit 102. The transmitting unit 102 generates a modulation signal based on an input signal, and changes the brightness of the light source 104 according to the modulation signal, thereby transmitting the modulation signal from the light source 104 as visible light. Furthermore, the modulation signal includes information related to the SSID (service set identifier) ​​of the plurality of access points. At least one of the plurality of access points is connected to a receiving device that receives the modulation signal using radio waves, and transmits information to the receiving device.

[0462] Furthermore, in the transmission method of this embodiment, a modulation signal is generated based on an input signal, and the brightness of the light source 104 is changed according to the modulation signal, so that the modulation signal is transmitted as visible light from the light source 104. Furthermore, the modulation signal includes information related to SSIDs (service set identifiers) of multiple access points that are different from each other in a wireless LAN (Local Area Network).

[0463] Furthermore, in the receiving method in the present embodiment, a modulated signal transmitted as visible light from a transmitting device is received, and analysis information is output by analyzing data based on the modulated signal, and based on the analysis information, a connection is made to an access point of a wireless LAN (Local Area Network) using radio waves. Here, the modulated signal includes information related to SSIDs (service set identifiers) of multiple access points that are different from each other in the wireless LAN. Furthermore, in the output of the above-mentioned analysis information, information related to an SSID is selected from the information related to the SSIDs of multiple access points included in the modulated signal, and the selected information related to the SSID is output as the above-mentioned analysis information. Furthermore, in the connection to the access point of the wireless LAN, a connection is made to an access point corresponding to the information related to the SSID output by the analysis among the above-mentioned multiple access points using radio waves.

[0464] Furthermore, in the communication method of this embodiment, a modulation signal is generated based on an input signal, and the brightness of the light source 104 is changed according to the modulation signal, so that the modulation signal is transmitted from the light source 104 as visible light. Here, the modulation signal includes information related to SSIDs (service set identifiers) of multiple access points that are different from each other in a wireless LAN (Local Area Network). Furthermore, at least one of the multiple access points is connected to a receiving device that receives the modulation signal using radio waves, and transmits information to the receiving device.

[0465] (Supplement 1 to the above embodiments)

[0466] In addition, it can be configured so that at least one of the FPGA (Field Programmable Gate Array) and the CPU (Central Processing Unit) downloads all or part of the software required to implement the communication method described in this application through wireless communication or wired communication. In addition, all or part of the software for updating can be downloaded through wireless communication or wired communication. In addition, the downloaded software can be stored in the storage unit, and the digital signal processing described in this application can be performed by operating at least one of the FPGA and the CPU according to the stored software.

[0467] In this case, a device having at least one of an FPGA and a CPU may be connected to a communication modem wirelessly or by wire, and the communication method described in the present application may be implemented through the device and the communication modem.

[0468] For example, the communication devices such as base stations, APs, and terminals described in this specification include at least one of an FPGA and a CPU, and the communication device may include an interface for obtaining software for operating at least one of the FPGA and the CPU from the outside. Furthermore, the communication device may include a storage unit for storing software obtained from the outside, and the FPGA and the CPU may be operated according to the stored software, thereby realizing the signal processing described in this application.

[0469] The transmission device described in this specification may be provided by the first "vehicle or vehicle", and the reception device described in this specification may be provided by the second "vehicle or vehicle", so as to perform data transmission and reception.

[0470] The "transmitting device or a part of the function of the transmitting device" described in this manual is connected to the first "vehicle or vehicle" via an interface, and the "receiving device or a part of the receiving device" described in this manual is connected to the second "vehicle or vehicle" via an interface, and data transmission is performed by sending and receiving.

[0471] Furthermore, the transmission device described in this specification may be provided in the first "vehicle or vehicle", and data transmission and reception may be performed by the transmission device and the reception device described in this specification.

[0472] The receiving device described in this specification may be provided in the second "vehicle or passenger vehicle", and data transmission and reception may be performed by the receiving device and the transmitting device described in this specification.

[0473] Furthermore, the "transmitting device or part of the function of the transmitting device" described in this specification may be connected to the first "vehicle or passenger" via an interface, and data transmission and reception may be performed through the series of transmitting devices and the receiving device described in this specification.

[0474] Alternatively, the "receiving device or part of the receiving device" described in this specification may be connected to the second "vehicle or passenger vehicle" via an interface, and data transmission and reception may be performed through the transmitting device described in this specification and the series of receiving devices.

[0475] In the case where "the vehicle or passenger vehicle" is equipped with the sending device or a part of the sending device described in this specification", or "the vehicle or passenger vehicle is connected to the sending device described in this specification or the function of a part of the sending device described in this specification via an interface", a light source equipped in the "vehicle or passenger vehicle" may also be used as the light source equipped in the sending device described in this specification.

[0476] For example, Fig.29The vehicle B100 shown in the figure includes light sources B101_1, B101_2, B101_3, and B101_4, and one or more of these light sources can be used as a light source for the transmission device described in this specification to transmit the optical modulated signal.

[0477] Furthermore, the function of selecting "which light source is used as the light source for the transmitting device described in this specification to transmit the light modulated signal" among the multiple light sources carried by the vehicle B100 may be provided by the transmitting device or a device connected to the transmitting device. Furthermore, the brightness of the light source, the irradiation angle of the light source, and the position of the light source may be set together.

[0478] In the case where "the vehicle or passenger vehicle" is equipped with the receiving device described in this specification or a part of the receiving device", or "the vehicle or passenger vehicle is connected to the receiving device described in this specification or the function of a part of the receiving device described in this specification via an interface", as the light receiving unit equipped with the receiving device described in this specification, the light receiving unit equipped with the "vehicle or passenger vehicle" (for example, an image sensor, a photodiode, etc.) may also be used.

[0479] For example, Fig.30 The vehicle B100 shown in the figure includes light receiving units B201_1, B201_3, B201_4, B201_5, and B201_6, and one or more of these light receiving units can be used as a light receiving unit for receiving the optical modulated signal by the receiving device described in this specification.

[0480] Furthermore, the function of selecting "which light receiving unit is used as the light receiving unit for receiving the optical modulated signal by the receiving device described in this specification" among the multiple light receiving units mounted on the vehicle B100 may be provided by the receiving device or a device connected to the receiving device. Furthermore, the angle of the light receiving unit and the position of the light receiving unit may be set together.

[0481] Furthermore, the function of the receiving device described in this specification to receive data can be displayed on the dash panel of the vehicle or the instrument panel of the passenger vehicle. Furthermore, the function of the receiving device described in this specification to receive data can be notified to the user by vibrating the steering wheel of the vehicle or the like or a vibrator provided in the steering wheel.

[0482] Furthermore, a vehicle equipped with the receiving device described in this embodiment may be connected to a terminal via an interface, and the data obtained by the receiving device may be stored in a storage unit of the terminal. Furthermore, a vehicle may also be equipped with a storage unit, and the received data may be stored in the vehicle. Furthermore, both the storage unit of the terminal and the storage unit of the vehicle may store the received data.

[0483] In this specification, the server may provide an application for processing related to the receiving device, and the terminal may install the application to implement the functions of the receiving device described in this specification. In addition, the application may be provided to the terminal by connecting to the server via a network through a communication device having a sending device described in this specification, and the application may also be provided to the terminal by connecting to the server via a network through a communication device having other sending functions.

[0484] Similarly, in this specification, the server may provide an application for processing related to the sending device, and the application may be installed by the communication device to implement the functions of the sending device described in this specification. In addition, a method of providing the application to the communication device by connecting to the server via a network through other communication devices may be considered.

[0485] Furthermore, the server may provide software related to the light source of the sending device and the light receiving part of the receiving device, and by obtaining the software, the light source of the sending device corresponds to the sending of the optical modulated signal, and the light receiving part of the receiving device corresponds to the receiving of the optical modulated signal.

[0486] Furthermore, the sending device in this specification may have the function of a server, and the application possessed by the sending device may be provided to the communication device using some communication means, and the communication device may obtain the application by downloading, thereby realizing the receiving device in this specification.

[0487] In addition, although the "illumination unit" and "light source" are described in this specification, it can also be a method in which a display or projector that displays images, moving images, advertisements, etc. emits light and the light includes a light modulation signal. That is, the "illumination unit" and "light source" can have functions other than the function of emitting light. In addition, the "illumination unit" and "light source" can also be composed of multiple "illuminations" and "light sources".

[0488] Furthermore, the transmission method used by the communication device that generates the optical modulation signal and emits light may be a method other than the transmission method described in this specification. Furthermore, the optical modulation signal may include information other than that described in this specification.

[0489] Furthermore, lighting such as LEDs, or the light source itself may also have the function of the transmitting device described in this specification.

[0490] Furthermore, the device for generating and transmitting a light modulated signal may not have an illumination device or a light source, and the device for generating and transmitting a light modulated signal may be connected to an illumination device or a light source via an interface.

[0491] The communication method between the transmitting device and the receiving device described in this embodiment of the present specification may also be Fig.31 The following is the communication method shown. Fig.31 Provide explanation.

[0492] The symbol mapping unit inputs transmission data and outputs a symbol sequence (ci) mapped based on the modulation method.

[0493] The pre-equalization processing unit receives a symbol sequence as input, performs pre-equalization processing on the symbol sequence in order to reduce the equalization processing on the receiving side, and outputs the symbol sequence after the pre-equalization processing.

[0494] The Hermite symmetry processing unit receives the symbol sequence after pre-equalization processing as input, allocates sub-bins to the symbol sequence after pre-equalization processing in a manner that ensures Hermite symmetry, and outputs a parallel signal.

[0495] The inverse (fast) Fourier transform unit receives the parallel signal as input, performs inverse (fast) Fourier transform on the parallel signal, and outputs the inverse (fast) Fourier transformed signal.

[0496] The parallel-serial and cyclic prefix adding unit receives the signal after the inverse (fast) Fourier transform as input, performs parallel-serial conversion and adds a cyclic prefix, and outputs the signal as a signal after the signal processing.

[0497] The digital-to-analog converter receives the processed signal as input, performs digital-to-analog conversion, and outputs an analog signal. The analog signal is output as light from one or more LEDs, for example.

[0498] Furthermore, the equalization pre-processing unit and the Hermitian symmetry processing unit may not exist. In other words, there may be a case where the signal processing is not performed in the equalization pre-processing unit and the Hermitian symmetry processing unit.

[0499] The photodiode uses light as input and obtains the received signal through the TIA (Transimpedance Amplifier).

[0500] The analog-to-digital conversion unit performs analog-to-digital conversion on the received signal and outputs a digital signal.

[0501] The cyclic prefix removal and serial-to-parallel conversion unit receives the digital signal as input, removes the cyclic prefix, performs serial-to-parallel conversion, and receives the parallel signal as input.

[0502] The (fast) Fourier transform unit receives the parallel signal as input, performs (fast) Fourier transform, and outputs the (fast) Fourier transformed signal.

[0503] The detection unit receives the Fourier-transformed signal as input, performs detection, and outputs a received symbol sequence.

[0504] The codeword demapper takes the received codeword series as input, performs demapping, and obtains the received data series.

[0505] As described above, even if a transmission device that transmits an optical modulated signal and a reception device that receives an optical modulated signal are applied to each embodiment in this specification, each embodiment can be implemented in the same manner.

[0506] Furthermore, the communication method between the transmitting device and the receiving device in this embodiment may be the communication method described below.

[0507] <Line Scan Sampling>

[0508] Smartphones and digital cameras are equipped with image sensors such as CMOS (Complementary Metal Oxide Semiconductor) sensors. Strictly speaking, the image captured by a CMOS sensor does not show the scenery at the same time as a whole. For example, the rolling shutter method that performs shutter action by line reads the amount of light received by the sensor for each line. To this end, the time required for reading is estimated, and the start and end of light reception are controlled based on the time difference of each line. In other words, the image captured by a CMOS sensor is composed of multiple overlapping lines with a slight time interval between each exposure period.

[0509] This method focuses on the properties of the CMOS sensor and realizes high-speed reception of visible light signals.

[0510] That is, in the first example of visible light communication, by taking advantage of the fact that the exposure time on each line is slightly different, such as Fig.32 As shown, the brightness and color of the light source at multiple times can be measured for each line from one image (image captured by the image sensor), so that a signal that is modulated rapidly compared to the frame rate can be captured.

[0511] This sampling method is called "row scanning sampling", and a column of pixels exposed at the same timing is called an "exposure row".

[0512] In addition, since "row scan sampling" can be implemented by a rolling shutter method using a CMOS sensor, "row scan sampling" can also be implemented by implementing a rolling shutter method using sensors other than CMOS sensors, such as CCD (Charge-Coupled Device) sensors, organic (CMOS) sensors, etc.

[0513] However, in the shooting setting of the camera function (moving image or still image shooting function), even if the light source is flickered quickly, it will not appear as a striped pattern along the exposure line. This is because in this setting, the exposure time is much longer than the flickering cycle of the light source, such as Fig.33 As shown, the change in brightness caused by the flickering of the light source (light emission pattern) is uniformly averaged, so that the change in pixel value between exposure lines becomes very small, resulting in almost the same image.

[0514] In this regard, Fig.34 As shown, by setting the exposure time to be less than the flickering period of the light source, the flickering state (light emission pattern) of the light source can be observed as a brightness change of the exposure line.

[0515] For example, the exposure lines are designed to be parallel to the long side of the image sensor. In this case, as an example, if the frame rate is set to 30fps (frames per second), more than 32,400 samples per second are obtained in a resolution of 1920×1080, and more than 64,800 samples per second are obtained in a resolution of 3840×2160.

[0516] <Application example of line scan sampling>

[0517] In addition, although the above description describes row scanning sampling in which a signal showing the amount of received light is read out for each row, the sampling method of light signals using image sensors such as CMOS is not limited thereto. As a sampling method used in receiving light signals, the following methods can be applied, namely, various methods that can obtain signals sampled at a sampling rate higher than the frame rate used in the capture of ordinary moving images. For example, a global shutter method with a shutter function per pixel can be used to control the exposure period and read out the signal per pixel, and a method of controlling the exposure period and reading out the signal in units of a plurality of pixel groups that are not configured in a row shape can be used. And a method that can be used is to read out the signal from the same pixel multiple times during a period equivalent to 1 frame at the frame rate used in the capture of ordinary moving images.

[0518] <Sampling by Frame>

[0519] Furthermore, by using a frame rate method that does not have a shutter function for each pixel, it is possible to sample the light signal even in a method that increases the frame rate.

[0520] In this specification, for example, any of the above-described “row scan sampling”, “application example of row scan sampling”, and “sampling by frame” can also be implemented.

[0521] <Light source and modulation method>

[0522] In visible light communication, for example, LED (Light Emitting Diode) is used as a transmitter. LED is widely used as a backlight source for lighting or display, and can be turned on and off quickly.

[0523] However, the light source used as a transmitter for visible light communication cannot be turned on and off freely because it is used for visible light communication. If the change in brightness through visible light communication is felt by people, it will affect the original function of the light source such as lighting. Therefore, it is necessary to transmit signals that will not dazzle people's eyes and can illuminate at the desired brightness.

[0524] As a modulation method that can meet such needs, there is a modulation method called 4PPM (4-Pulse Position Modulation). Fig.35A As shown in FIG. 4, 4PPM is a method of expressing 2 bits by combining the brightness and darkness of the light source four times. Fig.35A As shown, since 3 out of 4 times are in a bright state and 1 time is in a dark state, the average of the brightness (average brightness) is 3 / 4=75% regardless of the content of the signal.

[0525] For comparison, in the same way Fig.35B The Manchester coding method shown. The Manchester coding method is a method of expressing 1 bit in 2 states. Although the modulation efficiency is the same as 4PPM, which is 50%, since 1 of the 2 times is a bright state and 1 time is a dark state, the average brightness is 1 / 2=50%. That is, as a modulation method for visible light communication, it can be said that 4PPM is more suitable than the Manchester coding method. However, since the communication performance is not reduced even when the change in brightness caused by visible light communication is felt by people, it is possible to use a method that causes a change in brightness that people can feel, depending on the purpose. In addition, the transmitter (light source) can use modulation methods such as ASK (Amplitude Shift Keying), PSK (Phase Shift Keying), PAM (Pulse Amplitude Modulation), etc. to generate a modulated signal and light and illuminate the light source.

[0526] In addition, the communication method of the transmitting device and the receiving device described in this specification is not limited to the above example, and can be implemented in the same manner regardless of the wireless communication method using any frequency such as light, visible light, infrared, ultraviolet, etc. In addition, in the above description, although the example of receiving the light modulated signal by the image sensor is described, the light modulated signal can be received by using a photodiode instead of the image sensor, and the light modulated signal can be received without using an image sensor or a photodiode.

[0527] In this specification, although "a symbol related to location or position information", "a symbol related to time information", "a symbol related to SSID", "a symbol related to access destination", "a symbol related to encryption key", etc. are named as "a symbol" and explained as such, each embodiment can be performed in the same manner even if they are not called "a symbol" but called "data", "information", "field", "bit", or "region". In addition, names other than "a symbol", "data", "information", "field", "bit", or "region" may also be used. In addition, no matter which symbol constitutes "a symbol related to location or position information", "a symbol related to time information", "a symbol related to SSID", "a symbol related to access destination", "a symbol related to encryption key", etc., the transmitting device can transmit, and it is important to transmit "data related to location or position information", "data related to time information", "data related to SSID", "data related to access destination", "data related to encryption key", etc. to the communication partner.

[0528] In this specification, in a transmission device including a "light source", "illumination unit", etc., the "light source" and "illumination unit" may be composed of a plurality of "light sources" and a plurality of "illuminations".

[0529] (Supplement 2 to the above embodiments)

[0530] Of course, the embodiments and other contents described in this specification may be implemented in a plurality of combinations.

[0531] Furthermore, each implementation mode is merely an example. For example, “modulation method, error correction coding method (error correction code used, code length, coding rate, etc.), control information, etc.” are each an example. Even when other “modulation methods, error correction coding methods (error correction code used, code length, coding rate, etc.), control information, etc.” are applied, it can be implemented with the same structure.

[0532] Regarding the modulation method, even if a modulation method other than the modulation method described in this specification is used, the embodiments described in this specification and other contents can be executed. For example, APSK (Amplitude Phase Shift Keying) (for example, 16APSK, 64APSK, 128APSK, 256APSK, 1024APSK, 4096APSK, etc.), PAM (Pulse Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), PSK (Phase Shift Keying) (for example, BPSK, QPSK, 8PSK, 16PSK, 64PSK, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.), QAM (Quadrature Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), Modulation) (for example, 4QAM, 8QAM, 16QAM, 64QAM, 128QAM, 256QAM, 1024QAM, 4096QAM, etc.), etc., in each modulation method, uniform mapping or non-uniform mapping can also be used. Moreover, the configuration method of 2, 4, 8, 16, 64, 128, 256, 1024, etc. signal points in the IQ plane (modulation methods with 2, 4, 8, 16, 64, 128, 256, 1024, etc. signal points) is not limited to the signal point configuration method of the modulation method shown in this specification.

[0533] Examples of devices that include the wireless device described in this specification include communication broadcasting devices such as broadcasting stations, base stations, access points, terminals, and mobile phones, and communication devices such as televisions, radios, terminals, personal computers, mobile phones, access points, and base stations. Furthermore, the wireless device described in this specification is a device having a communication function, and it is also possible to consider a form in which the device can be connected to a device that executes an application such as a television, radio, personal computer, or mobile phone via a certain interface.

[0534] Furthermore, the receiving unit described in this specification may be considered to include, for example, communication broadcasting equipment such as broadcasting stations, base stations, access points, terminals, and mobile phones, and communication equipment such as televisions, radios, terminals, personal computers, mobile phones, access points, and base stations.

[0535] In the wireless communication performed by radio waves in this embodiment, symbols other than data symbols, such as pilot symbols (preamble, unique word, post-synchronization code, reference symbol, etc.), symbols for control information, etc., can be arbitrarily arranged in the frame. Moreover, although they are named as pilot symbols and symbols for control information, they can be named arbitrarily, and the function itself is important.

[0536] The pilot code element can be, for example, a known code element modulated by PSK modulation in a transceiver (or can be synchronized with the receiver so that the receiver knows the code element sent by the transmitter). The receiver uses this code element to perform frequency synchronization, time synchronization, channel estimation (CSI (Channel State Information) estimation) (of each modulated signal), signal detection, etc.

[0537] Furthermore, the codewords used for control information are codewords used to transmit information that needs to be transmitted to the communication partner in order to realize communications other than (application, etc.) data (for example, the modulation method used in the communication, the error correction coding method, the coding rate of the error correction coding method, the setting information of the upper layer, etc.).

[0538] In addition, the present invention is not limited to the embodiments, and can be implemented with various modifications. For example, in each embodiment, although the case where it is implemented as a communication device is described, it is not limited to this, and the communication method can also be implemented as software.

[0539] In addition, for example, a program for executing the above-mentioned communication method may be stored in advance in a ROM (Read Only Memory), and the program may be operated by a CPU (Central Processing Unit).

[0540] Furthermore, a program for executing the above communication method may be stored in a computer-readable storage medium, and the program stored in the storage medium may be recorded in a RAM (Random Access Memory) of a computer, so that the computer can be operated according to the program.

[0541] Furthermore, each structure of each of the above-mentioned embodiments and the like can typically be implemented as an LSI (LargeScale Integration) of an integrated circuit. They can be made into a single chip, or all or part of the structures of each embodiment can be included in one chip. Here, although it is set as LSI, it is also called IC (Integrated Circuit), system LSI, super LSI, and ultra-large-scale LSI according to the difference in integration. Moreover, the method of integrated circuitization is not limited to LSI, and can also be implemented by a dedicated circuit or a general-purpose processor. It is also possible to use an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection and setting of the circuit unit inside the LSI. Furthermore, if a technology for integrated circuitization that replaces LSI appears due to the advancement of semiconductor technology or other derived technologies, then of course, the technology can also be used to integrate functional blocks. There are also possibilities for application in biotechnology.

[0542] In addition, in embodiments 4, 5, 6, and 7 of this specification, encryption keys for wirelessly connecting a terminal to a base station are described; however, the encryption keys are not limited to “encryption keys for wireless connection”.

[0543] For example, a base station may be connected to a network, and a terminal may communicate with the network via the base station. In this case, the encryption key may be an "encryption key for connecting the terminal to the network". Furthermore, the optical modulation signal described in this specification includes information on the "encryption key", so that even if the various embodiments described in this specification are implemented, the same implementation can be performed, and accordingly, the effects described in the various embodiments can be obtained in the same manner.

[0544] Furthermore, the optical modulated signal may include at least one of an encryption key of “an encryption key for connecting to a base station (for example, an encryption key for an SSID)” and an encryption key for connecting to a network.

[0545] Industrial Applicability

[0546] The present invention can be widely applied to communication systems that transmit and receive optical modulated signals.

[0547] Explanation of symbols

[0548] 102 Sending Department

[0549] 104 Light Source

[0550] 151 Light Receiving Unit

[0551] 153 Receiving Department

[0552] 155 Data Analysis Department

[0553] 157 Display

[0554] 453 Wireless Device

[0555] 470-1 Base Station #1

[0556] 470-2 Base Station #2

[0557] 470-3 Base Station #3

[0558] 1000 devices

[0559] 1050 Terminal

Claims

1. A receiving method, wherein: include: receiving, at a terminal, an optical signal transmitted from an optical transmitting device; Demodulating the optical signal to obtain first data, the first data including an identifier of a wireless transmitting device and a location identifier of the optical transmitting device; Receiving a wireless signal from the wireless transmitting device at the terminal; as well as demodulating the wireless signal to obtain second data, the second data including map data, the map data including the location identifier of the optical transmitting device, After the reception and the demodulation of the optical signal, the reception and the demodulation of the wireless signal are performed based on the identifier of the wireless transmission device obtained by receiving and demodulating the optical signal.

2. A receiving device, wherein: including an optical signal receiver and a wireless communication device, The optical signal receiver, in operation, receiving an optical signal sent from an optical sending device; as well as Demodulating the optical signal to obtain first data, the first data including an identifier of a wireless transmission device and a location identifier of the optical transmission device, The wireless communication device, in operation, receiving a wireless signal from the wireless transmitting device; as well as demodulating the wireless signal to obtain second data, the second data including map data, the map data including the location identifier of the optical transmitting device, After the reception and the demodulation of the optical signal, the reception and the demodulation of the wireless signal are performed based on the identifier of the wireless transmission device obtained by receiving and demodulating the optical signal.

Images