WO2016098401A1 - 情報処理装置、無線通信装置、情報処理方法およびプログラム - Google Patents
情報処理装置、無線通信装置、情報処理方法およびプログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- This technology relates to a wireless communication device.
- the present invention relates to an information processing apparatus that handles information related to wireless communication, a wireless communication apparatus, an information processing method, and a program that causes a computer to execute the method.
- Patent Document 1 there is a wireless communication technology for exchanging various data using wireless communication (see, for example, Patent Document 1 and Non-Patent Document 1).
- data communication can be performed between a wireless communication device and a base station using a wireless LAN (Local Area Network).
- a procedure called Association is performed before the data communication.
- the wireless communication apparatus and the base station are linked one-on-one.
- wireless communication devices are required to be downsized and driven for a long time.
- a portable wireless communication device since a portable wireless communication device operates with a limited battery, it is important to reduce power consumption of the wireless communication device. Therefore, it is considered that the power consumption of the wireless communication device can be reduced by omitting a procedure such as Association.
- a transmission signal from a wireless communication device can be received by a plurality of base stations.
- each base station returns a reception response (ACK) based on the reception result, there is a high possibility that a plurality of base stations transmit ACK. For this reason, interference may occur when the wireless communication apparatus receives ACK.
- ACK reception response
- This technology was created in view of such a situation, and aims to reduce interference caused by response signals.
- the present technology has been made to solve the above-described problems, and a first aspect thereof is a response signal that responds to the signal when a signal is received from a wireless communication device using wireless communication.
- An information processing apparatus including a control unit that autonomously controls transmission to the wireless communication apparatus, an information processing method thereof, and a program for causing a computer to execute the method.
- control unit may determine whether to transmit the response signal to the wireless communication device based on the received signal strength of the signal. Thereby, based on the received signal strength of the signal, there is an effect of determining whether or not to transmit the response signal to the wireless communication device.
- the control unit uses the determination method based on a comparison result between the received signal strength of the signal and a threshold value and a determination method that randomly determines the response signal to the wireless communication device. It may be determined whether or not to transmit. Accordingly, there is an effect of determining whether or not to transmit the response signal to the wireless communication device based on the comparison result between the received signal strength of the signal and the threshold value and the determination process based on the random number.
- control unit may randomly determine whether or not to transmit the response signal to the wireless communication device. This brings about the effect of randomly determining whether or not to transmit a response signal to the wireless communication device.
- control unit randomly determines whether or not to transmit the response signal to the wireless communication device when the received signal strength of the signal is a value within a predetermined range. You may make it do. Thereby, when the received signal strength of the signal is a value within a predetermined range, there is an effect of randomly determining whether or not to transmit the response signal to the wireless communication device.
- control unit may randomly determine a timing for transmitting the response signal to the wireless communication device. This brings about the effect of randomly determining the timing for transmitting the response signal to the wireless communication device.
- the control unit uses the determination method based on a comparison result between the received signal strength of the signal and a threshold value and a determination method that randomly determines the response signal to the wireless communication device.
- the transmission timing may be determined. Accordingly, there is an effect that the timing for transmitting the response signal to the wireless communication apparatus is determined based on the comparison result between the received signal strength of the signal and the threshold value and the determination process based on the random number.
- the control unit determines whether to transmit the response signal to the wireless communication device based on the received signal strength of the signal, and sends the response signal to the wireless communication device.
- the timing for transmitting the response signal to the wireless communication device may be determined at random. Accordingly, it is determined whether to transmit a response signal to the wireless communication device based on the received signal strength of the signal, and when it is determined to transmit the response signal to the wireless communication device, the response signal is transmitted to the wireless communication device. This has the effect of randomly determining the transmission timing.
- Wireless communication apparatus including a control unit that designates at least one of a determination method for determining whether or not to determine the transmission timing of the response signal, an information processing method therefor, and a program for causing a computer to execute the method It is. Accordingly, when a signal is transmitted to the information processing apparatus using wireless communication, a determination method for determining whether or not the information processing apparatus transmits a response signal in response to the signal to the wireless communication apparatus, and the response This has the effect of specifying at least one of the determination methods for determining the signal transmission timing.
- control unit may include information for designating the determination method in the signal and transmit the information.
- the information for designating the determination method is included in the signal and transmitted.
- the control unit may set a waiting time for the response signal corresponding to the determination method.
- the response signal waiting time corresponding to the determination method is set.
- FIG. 7 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the first embodiment of the present technology. It is a figure which shows in a time series the relationship between each apparatus which comprises the communication system 10 in 2nd Embodiment of this technique, and the information transmitted / received between each apparatus.
- 12 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the second embodiment of the present technology.
- 12 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the second embodiment of the present technology.
- 12 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the second embodiment of the present technology.
- 22 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the third embodiment of the present technology. It is a figure showing an example of composition of a data frame in case radio communications apparatus 100 in a 4th embodiment of this art performs data transmission. It is a sequence chart which shows the example of a communication process between each apparatus which comprises the communication system 10 in 4th Embodiment of this technique.
- 24 is a flowchart illustrating an example of a processing procedure of communication processing by the wireless communication device 100 according to the fourth embodiment of the present technology.
- 24 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the fourth embodiment of the present technology.
- First Embodiment> [Configuration example of communication system] 1 and 2 are diagrams illustrating a system configuration example of the communication system 10 according to the first embodiment of the present technology.
- the communication system 10 includes a wireless communication device 100, a base station 200, and a base station 300.
- a wireless communication device 100 includes a wireless communication device 100, a base station 200, and a base station 300.
- FIG. 1 and FIG. 2 communication paths between devices that can exchange information using wireless communication are schematically shown by dotted arrows.
- the base station 200 and the base station 300 are examples of the information processing device described in the claims.
- FIG. 1 illustrates an example in which the wireless communication device 100 exists at a position where the distance between the wireless communication device 100 and the base station 200 and the distance between the wireless communication device 100 and the base station 300 are substantially the same.
- FIG. 2 illustrates an example in which the wireless communication device 100 exists at a position where the distance between the wireless communication device 100 and the base station 300 is closer than the distance between the wireless communication device 100 and the base station 200.
- the wireless communication device 100 is, for example, a portable or fixed information processing device or electronic device having a wireless communication function.
- the portable information processing device is an information processing device such as a smartphone, a mobile phone, or a tablet terminal
- the fixed information processing device is, for example, a printer, a personal computer, or the like.
- Information processing apparatus is, for example, a portable or fixed information processing device or electronic device having a wireless communication function.
- the portable information processing device is an information processing device such as a smartphone, a mobile phone, or a tablet terminal
- the fixed information processing device is, for example, a printer, a personal computer, or the like.
- Information processing apparatus is, for example, a portable or fixed information processing device or electronic device having a wireless communication function.
- the wireless communication device 100 can be an electronic device with low power consumption, for example.
- This electronic device with low power consumption can be, for example, BLE (Bluetooth (registered trademark) Low Energy) that transmits sensor data (for example, pulse, body temperature, position).
- the electronic device can be a device that can be worn by a person.
- the electronic device can be a device that detects a sudden change in a person wearing the device and detects that the person has fallen based on the change, or a device that detects a heart attack or the like.
- detection information is transmitted to another information processing apparatus (for example, management server) via the base stations 200 and 300 at the time of detection or periodically.
- an emergency call for example, information related to human life (for example, information for notifying a heart attack, information for notifying that a person has fallen)) is detected via the base stations 200 and 300 at the time of detection. It is transmitted to another information processing apparatus.
- information related to human life for example, information for notifying a heart attack, information for notifying that a person has fallen
- a configuration example of the wireless communication device 100 will be described in detail with reference to FIG. Further, configuration examples of the base stations 200 and 300 will be described in detail with reference to FIG.
- 1 and 2 illustrate an example of the communication system 10 including two base stations 200 and 300, the first embodiment of the present technology also applies to a communication system including three or more base stations. Can be applied.
- 1 and 2 show an example of the communication system 10 including one wireless communication device 100, but the first embodiment of the present technology is also applied to a communication system including two or more wireless communication devices. can do.
- the communication system 10 can grasp the base station 200 and the base station 300 as transmitters and the wireless communication device 100 as a receiver. Further, the communication system 10 can also grasp the base station 200 and the base station 300 as receivers and the wireless communication apparatus 100 as a transmitter.
- FIG. 3 is a block diagram illustrating a functional configuration example of the wireless communication device 100 according to the first embodiment of the present technology.
- the wireless communication device 100 includes a communication unit 110, a control unit 120, a storage unit 130, an operation reception unit 140, a display unit 150, and a power supply unit 160.
- the communication unit 110 is a module (for example, a wireless local area network (LAN) modem) for transmitting and receiving radio waves via an antenna (not shown).
- the communication unit 110 can perform wireless communication using a wireless LAN communication method.
- the communication unit 110 includes IEEE (Institute of Electrical and Electronics Electronics) 802.11, IEEE 802.15, IEEE 802.16, 3GPP (3rd Generation Partnership Project) specifications (for example, W-CDMA (Wideband Code Division Multiple Access), Wireless communication can be performed by a communication system compliant with GSM (registered trademark) (Global System for Mobile Communications), WiMAX (Worldwide Interoperability for Microwave Access), WiMAX2, LTE (Long Term Evolution, LTE-A (Advanced)) it can.
- the communication unit 110 may be another public network (mobile network), Bluetooth (registered trademark), ZigBee (registered trademark), BLE, or ANT (2.4 GHz band ultra-low power consumption near-field network).
- Wireless communication can be performed by a communication method such as a protocol.
- the communication part 110 can exchange various information using a wireless communication function.
- wireless communication using a wireless LAN can be performed between the devices.
- this wireless LAN for example, Wi-Fi (Wireless Fidelity) Direct, TDLS (Tunneled Direct Link Link Setup), ad hoc network, and mesh network can be used.
- the control unit 120 controls each unit of the wireless communication device 100 based on a control program stored in the storage unit 130.
- the control unit 120 is realized by, for example, a CPU (Central Processing Unit).
- the control unit 120 performs signal processing of transmitted / received information.
- the control unit 120 when transmitting a signal to the base stations 200 and 300 using wireless communication, the control unit 120 designates a determination method related to transmission of a response signal (ACK (ACKnowledgement)) in response to the signal. Can do.
- the control unit 120 can specify a determination method for determining whether the base stations 200 and 300 transmit the response signal (ACK) to the wireless communication apparatus 100.
- the control unit 120 can specify a determination method for determining the transmission timing of the response signal (ACK). The designation of these determination methods will be described in detail in the fourth embodiment of the present technology.
- the storage unit 130 is a memory that stores various types of information.
- the storage unit 130 stores various information (for example, a control program) necessary for the wireless communication device 100 to perform a desired operation.
- the operation accepting unit 140 is an operation accepting unit that accepts an operation input made by a user, and outputs operation information corresponding to the accepted operation input to the control unit 120.
- the operation reception unit 140 is realized by, for example, a touch panel, a keyboard, a mouse, and a sensor (for example, a touch interface).
- the display unit 150 is a display unit that outputs various types of information based on the control of the control unit 120.
- a display panel such as an organic EL (Electro Luminescence) panel or an LCD (Liquid Crystal Display) panel can be used.
- the operation receiving unit 140 and the display unit 150 can be integrally configured using a touch panel that allows a user to input an operation by touching or approaching the finger with the display surface.
- the power supply unit 160 supplies power to each unit of the wireless communication device 100 based on the control of the control unit 120.
- the power supply unit 160 is, for example, a battery built in the wireless communication device 100 or a battery that can be attached to the wireless communication device 100.
- the control unit 120 has a function of estimating the remaining battery level, and can acquire the estimated remaining battery level as needed.
- FIG. 4 is a block diagram illustrating a functional configuration example of the base station 200 according to the first embodiment of the present technology.
- the functional configuration of the base station 300 is the same as that of the base station 200, only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- the base station 200 includes a communication unit 210, a control unit 220, and a storage unit 230.
- the communication unit 210 is for transmitting and receiving radio waves via an antenna (not shown).
- the communication unit 210 performs wireless communication by a communication method (for example, wireless LAN) corresponding to the wireless communication device 100.
- the communication unit 210 can perform wireless communication by a communication method compliant with IEEE802.11, IEEE802.15, IEEE802.16, 3GPP specifications.
- the communication unit 210 can exchange various information using a wireless communication function.
- the control unit 220 controls each unit of the base station 200 based on a control program stored in the storage unit 230.
- the control unit 220 is realized by a CPU, for example.
- the control unit 220 performs signal processing of transmitted / received information.
- control unit 220 autonomously controls transmission of a response signal (ACK) in response to the signal to the wireless communication device 100. can do.
- ACK response signal
- the storage unit 230 is a memory that stores various types of information.
- the storage unit 230 stores various information (for example, a control program) necessary for the base station 200 to perform a desired operation.
- FIG. 5 is a diagram illustrating a configuration example of a data frame when the wireless communication device 100 according to the first embodiment of the present technology performs data transmission.
- FIG. 5 shows a configuration example of a data frame when a wireless LAN is used as a communication method.
- the data frame is composed of, for example, a preamble 401, an SFD (Sync frame detection) 402, a terminal ID (identification) 403, and information 404.
- Preamble 401 is a known pattern for a receiving device (for example, a base station) to detect as a radio signal.
- the receiving device can detect the presence or absence of a radio signal by calculating the correlation between the known pattern and the received signal.
- SFD 402 is a known pattern indicating a break of a data frame.
- the receiving apparatus can detect a break in a data frame by calculating a correlation with a known pattern. Then, the receiving device can interpret the meaning of the subsequent data by detecting the break of the data frame.
- the terminal ID 403 is a unique ID of the wireless communication apparatus 100 that transmits the data frame.
- a MAC (Media Access Control) address can be used.
- other terminal identification information may be used as the terminal ID 403.
- Information 404 is data transmitted from the wireless communication apparatus 100 to the base station.
- data for example, sensor data
- information 404 is transmitted as information 404 to the base station.
- IEEE 802.11 for example, wireless LAN
- a procedure called association is performed before the data communication is performed.
- the wireless communication apparatus and the base station are linked one-on-one.
- data transmitted by a wireless communication device can be received by a plurality of base stations.
- the wireless communication apparatus and the base station are associated one-to-one by association, it is possible to determine whether or not the base station performs an ACK response based on the association relationship. Thereby, the interference by a plurality of base stations performing ACK transmission can be prevented.
- an association procedure is required, so that extra power is consumed.
- a case where the wireless communication device moves is assumed.
- the wireless communication device moves and exceeds the wireless transmission range of the base station, it is necessary to perform association with another base station again. In this case, power is further consumed.
- wireless communication devices are required to be downsized and driven for a long time.
- a portable wireless communication device since a portable wireless communication device operates with a limited battery, it is important to reduce power consumption of the wireless communication device. Therefore, it is considered that the power consumption of the wireless communication device can be reduced by omitting a procedure such as Association.
- a transmission signal from a wireless communication device can be received by a plurality of base stations.
- each base station returns a reception response (ACK) based on the reception result, there is a high possibility that a plurality of base stations transmit ACK. For this reason, interference may occur when the wireless communication apparatus receives ACK.
- ACK reception response
- FIG. 6 is a diagram illustrating, in time series, the relationship between each device configuring the communication system 10 according to the first embodiment of the present technology and information transmitted / received between the devices.
- the horizontal axis indicates the time axis.
- data transmitted by each device is schematically represented by a solid rectangle on the time axis
- data received by each device is schematically represented by a dotted rectangle on the time axis.
- the wireless communication apparatus 100 performs data transmission (411).
- the data frame (411) transmitted from the wireless communication device 100 is received by the base station 200 and the base station 300 (412, 413).
- each of the base station 200 and the base station 300 that has received the data frame (411) transmitted from the wireless communication apparatus 100 determines whether or not to transmit an ACK for the data frame. That is, whether to transmit ACK is determined for each base station. This determination method will be described in detail with reference to FIG.
- FIG. 6 shows an example in which the base station 200 determines to transmit ACK and the base station 300 determines not to transmit ACK.
- the base station 200 transmits an ACK for the data frame (411) transmitted from the wireless communication device 100 (414, 415).
- the base station 300 does not transmit an ACK for the data frame (411) transmitted from the wireless communication apparatus 100.
- the wireless communication device 100 receives the ACK (415). Thereby, the radio
- FIG. 7 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the first embodiment of the present technology.
- FIG. 7 illustrates an operation example when the base station 200 receives a data frame transmitted from the wireless communication apparatus 100.
- the operation example of the base station 300 is the same as that of the base station 200, and therefore only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- the control unit 220 of the base station 200 measures the received power (received signal strength) of the received data frame (step S801).
- the received power is an example of the received signal strength described in the claims.
- the received power has a different value depending on the propagation state between the radio communication apparatus that has transmitted the data frame and the base station.
- the received power generally has a value corresponding to the distance between the radio communication apparatus that transmitted the data frame and the base station.
- the received power is a large value.
- the received power is a small value.
- the received power may increase or decrease due to the influence of a reflector existing around the wireless communication device that transmitted the data frame, an object existing between the wireless communication device and the base station, or the like.
- the received power may increase or decrease due to the influence of a reflector or the like existing around the wireless communication device.
- RSSI Received Signal Strength Indicator
- SINR Signal to Interference and Noise Power Ratio
- SNR Signal to Noise Ratio
- control unit 220 compares the measured received power with the threshold value TH1, and determines whether or not the received power is greater than the threshold value TH1 (step S802). If the received power is greater than the threshold value TH1 (step S802), the control unit 220 determines to transmit an ACK for the received data frame (step S807).
- control unit 220 compares the received power with threshold TH2 (where TH2 ⁇ TH1), and the received power is greater than threshold TH2. It is determined whether or not it is smaller (step S803). If the received power is smaller than the threshold value TH2 (step S803), the control unit 220 determines not to transmit an ACK for the received data frame (step S806).
- control unit 220 performs ACK transmission. It is determined at random (steps S804 to S807).
- control unit 220 For example, the control unit 220 generates a uniform random number in the range of 0 to 1 (step S804). Then, the control unit 220 compares the generated uniform random number (0 to 1) with a threshold value TH3 (where 0 ⁇ TH3 ⁇ 1), and the uniform random number (0 to 1) is greater than the threshold value TH3. It is determined whether it is larger (step S805). When the uniform random number (0 to 1) is larger than the threshold value TH3 (step S805), the control unit 220 determines to transmit an ACK for the received data frame (step S807).
- a threshold value TH3 where 0 ⁇ TH3 ⁇ 1
- step S805 If the uniform random number (0 to 1) is equal to or less than the threshold value TH3 (step S805), the control unit 220 determines not to transmit an ACK for the received data frame (step S806). Note that steps S801 to S807 are an example of a control procedure described in the claims.
- the threshold value TH1 and the threshold value TH2 are values that satisfy TH2 ⁇ TH1.
- the threshold value TH1 and the threshold value TH2 can be set based on the estimation error of the received power of the base station 200. For example, when the estimation error of the received power of the base station 200 is 10 dB, the difference between the threshold value TH1 and the threshold value TH2 can be 10 dB.
- the threshold value TH1 and the threshold value TH2 can be set according to the environment where the base station 200 is installed, for example. For example, when comparing urban and rural areas, it is assumed that the attenuation rate of radio waves is different. For example, in urban areas, the visibility is often poor due to buildings and the like, and it is estimated that the attenuation rate of radio waves is high. On the other hand, in rural areas, it is estimated that the attenuation rate of radio waves is low because the prospect is good due to the absence of buildings and the like. Therefore, the threshold value TH1 and the threshold value TH2 can be set in consideration of the attenuation rate of these radio waves. That is, the threshold value TH1 and the threshold value TH2 can be set based on the position information regarding the base station 200.
- Threshold value TH3 is a value in the range of 0 to 1.
- the wireless communication device 100 when the wireless communication device 100 is present at the position illustrated in FIG. 2, the wireless communication device 100 is close to the base station 300, and thus received power measured by the base station 300 (from the wireless communication device 100). It is assumed that the received power of the data frame is increased. For this reason, it is assumed that the received power exceeds the threshold value TH1. As described above, when the received power measured by the base station 300 (the received power of the data frame from the radio communication device 100) exceeds the threshold value TH1, the base station 300 performs the processing for the data frame from the radio communication device 100. Send ACK.
- the reception power (data frame reception power from the radio communication device 100) measured by the base station 200 is a small value. It is assumed that For this reason, it is assumed that the received power is smaller than the threshold value TH2. As described above, when the received power measured by the base station 200 (the received power of the data frame from the radio communication device 100) is smaller than the threshold value TH2, the base station 200 responds to the data frame from the radio communication device 100. Do not send ACK.
- each of base station 200 and base station 300 may be a value between the threshold value TH1 and the threshold value TH2. In this case, each of base station 200 and base station 300 randomly determines whether or not to perform ACK transmission for the data frame from radio communication apparatus 100.
- the threshold value TH3 can be set to 0.5 (1-1 / 2).
- one of the base station 200 and the base station 300 can be determined to transmit an ACK stochastically.
- the control unit 220 of the base station 200 when the control unit 220 of the base station 200 receives a signal from the wireless communication device 100 using wireless communication, the control unit 220 transmits a response signal (ACK) in response to the signal to the wireless communication device 100. It can be controlled autonomously. For example, the control unit 220 can determine whether or not to transmit the response signal to the wireless communication device 100 based on the received signal strength (received power) of the signal. For example, the control unit 220 can randomly determine whether or not to transmit the response signal to the wireless communication device 100. In this case, when the received signal strength of the signal is a value within a predetermined range (for example, within the range of threshold value TH1 to threshold value TH2), control unit 220 transmits the response signal to radio communication apparatus 100. It can be determined at random.
- a predetermined range for example, within the range of threshold value TH1 to threshold value TH2
- Second Embodiment> In the first embodiment of the present technology, an example in which whether to transmit ACK is determined for each base station has been described. In the second embodiment of the present technology, an example in which the timing for transmitting an ACK is determined for each base station is shown.
- each device in the second embodiment of the present technology is substantially the same as that of the wireless communication device 100 and the base stations 200 and 300 shown in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 8 is a diagram illustrating, in time series, the relationship between each device configuring the communication system 10 and information transmitted / received between the devices according to the second embodiment of the present technology.
- the horizontal axis indicates the time axis.
- data transmitted by each device is schematically represented by a solid rectangle on the time axis
- data received by each device is schematically represented by a dotted rectangle on the time axis.
- the wireless communication apparatus 100 performs data transmission (421).
- the data frame (421) transmitted from the wireless communication device 100 is received by the base station 200 and the base station 300 (422, 423).
- each of the base station 200 and the base station 300 that has received the data frame (421) transmitted from the wireless communication apparatus 100 determines the timing for transmitting an ACK for the data frame for each base station.
- the method for determining the ACK transmission timing will be described in detail with reference to FIGS.
- each of the base station 200 and the base station 300 determines the timing for transmitting an ACK for the data frame.
- base station 200 determines to transmit ACK after elapse of t1 after receiving the data frame
- base station 300 determines to transmit ACK after elapse of t2 after receiving the data frame.
- the base station 200 transmits an ACK for the data frame (421) transmitted from the wireless communication device 100 after t1 has elapsed after receiving the data frame (424, 425).
- the base station 300 transmits an ACK for the data frame (421) transmitted from the wireless communication apparatus 100 after the data frame is received t2 (426, 427).
- the wireless communication device 100 receives the ACK (425, 427). Thereby, the radio
- the interval t1 can be a value smaller than the interval t2.
- the interval t2 can be set to a value larger than a value obtained by adding the transmission time of ACK and the interval t1. That is, the interval t2 can be set to a value larger than the transmission time of the interval t1 + ACK.
- the interval t2 may be the interval t1 + the transmission time of the ACK + t (where t> 0).
- FIG. 9 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the second embodiment of the present technology.
- FIG. 9 shows an operation example when the base station 200 receives a data frame transmitted from the wireless communication apparatus.
- FIG. 9 shows an example in which the timing for transmitting an ACK for the received data frame is randomly determined.
- FIG. 9 shows an example in which there are two base stations existing around the base station 200. Note that the operation example of the base station 300 is the same as that of the base station 200, and therefore only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- control unit 220 of the base station 200 generates a uniform random number ranging from 0 to 1 (step S811). Then, the control unit 220 compares the generated uniform random number (0 to 1) with the threshold value TH4, and determines whether or not the uniform random number (0 to 1) is larger than the threshold value TH4 (step S4). S812).
- control unit 220 determines the timing for transmitting the ACK for the received data frame as the interval t1 (step S813).
- control unit 220 determines the timing for transmitting the ACK for the received data frame as the interval t2 (step S814). .
- the threshold value TH4 can be set based on the environment in which the base station 200 is installed.
- the threshold value TH4 can be set based on the number of base stations existing around the base station 200.
- the timing at which each of the base station 200 and the base station 300 transmits ACK can be divided into the interval t1 and the interval t2 in a probabilistic manner. Thereby, possibility that ACK will interfere can be reduced.
- control unit 220 of the base station 200 can randomly determine the timing for transmitting the response signal (ACK) to the wireless communication device 100.
- FIG. 9 illustrates an example in which there are two base stations existing around the base station 200.
- the second embodiment of the present technology can also be applied to a case where there are three or more base stations around the base station 200. Therefore, in FIG. 10, an operation example when there are three or more base stations existing around the base station 200 will be described.
- FIG. 10 is a flowchart illustrating an example of a processing procedure of communication processing performed by the base station 200 according to the second embodiment of the present technology.
- FIG. 10 shows an example where there are five base stations around the base station 200. Since FIG. 10 is a modification of the operation example shown in FIG. 9, the description of the parts common to FIG. 9 is omitted.
- each process (steps S821 to S823) shown in FIG. 10 corresponds to each process (steps S811 to S813) shown in FIG. Further, each process (steps S824 to S830) illustrated in FIG. 10 corresponds to each process (steps S812 to S814) illustrated in FIG.
- the thresholds TH5 to TH8 and the intervals t1 to t5 will be described.
- the thresholds TH5 to TH8 can be set based on the environment in which the base station 200 is installed.
- the thresholds TH5 to TH8 can be set based on the number of base stations existing around the base station 200.
- the interval t1 and the interval t2 can be set to the same values as in the example shown in FIG.
- the intervals t3 to t5 can be calculated in the same manner as the interval t2.
- the interval t3 can be set to a value larger than the transmission time of the interval t2 + ACK.
- the interval t3 can be set as the interval t2 + ACK transmission time + t (where t> 0).
- the intervals t1 to t5 may be set as appropriate based on a predetermined rule (for example, simple increase or simple decrease).
- FIG. 9 and FIG. 10 the example which determines the timing which transmits ACK with respect to the received data frame at random was shown. However, the ACK transmission timing may be determined randomly in consideration of the received power of the data frame. An example of this is shown in FIG.
- FIG. 11 is a flowchart illustrating an example of a processing procedure of communication processing performed by the base station 200 according to the second embodiment of the present technology.
- FIG. 11 shows an operation example when the base station 200 receives a data frame transmitted from the wireless communication apparatus. Further, FIG. 11 shows an example in which the timing for transmitting an ACK for a received data frame is determined randomly in consideration of the received power of the data frame.
- FIG. 11 shows an example in which there are two base stations existing around the base station 200. Note that the operation example of the base station 300 is the same as that of the base station 200, and therefore only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- control unit 220 of the base station 200 measures the received power of the received data frame (step S841). Subsequently, the control unit 220 of the base station 200 generates a uniform random number in the range of 0 to 1 (step S842).
- control unit 220 compares the measured received power with the threshold value TH9 and determines whether or not the received power is greater than the threshold value TH9 (step S843). If the received power is equal to or lower than the threshold value TH9 (step S843), the process proceeds to step S844. If the received power is greater than the threshold value TH9 (step S843), the process proceeds to step S847.
- the thresholds TH9 to TH11 can be set based on the environment in which the base station 200 is installed.
- the threshold value TH9 may be a received power value (for example, an average value) when it is assumed that a wireless communication apparatus that transmits a data frame exists at the center position between the base station 200 and another base station. it can.
- the threshold value TH10 can be set to a value smaller than 1-1 / N.
- the threshold value TH11 can be set to a value larger than 1-1 / N. Note that N is the number of base stations existing around the base station 200.
- interval t1 and the interval t2 can be set to the same values as in the example shown in FIG.
- FIG. 11 shows an example in which the interval to be set is two types of interval t1 and interval t2, three or more intervals may be set.
- the timing for transmitting the ACK for the received data frame can be determined randomly in consideration of the reception power of the data frame.
- the interval between base stations installed in the vicinity of the wireless communication device that transmitted the data frame can be shortened, and the base station installed far away from the wireless communication device can be selected.
- the interval to do can be lengthened.
- FIG. 12 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the third embodiment of the present technology.
- FIG. 12 shows an operation example when the base station 200 receives a data frame transmitted from the wireless communication apparatus. Note that the operation example of the base station 300 is the same as that of the base station 200, and therefore only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- control unit 220 of the base station 200 performs an ACK transmission determination process (step S851).
- This ACK transmission determination process corresponds to each process shown in FIG.
- control unit 220 determines whether or not it is determined to transmit ACK by the ACK transmission determination process (step S852). If it is determined not to transmit ACK (step S852), the operation of the communication process is terminated.
- step S853 When it is determined to transmit ACK (step S852), the control unit 220 performs ACK transmission timing determination processing (step S853).
- This ACK transmission timing determination process corresponds to each process shown in FIGS.
- control unit 220 of the base station 200 can determine whether or not to transmit the response signal to the radio communication apparatus 100 based on the received signal strength (received power) of the signal. Then, when it is determined that the response signal is to be transmitted to the wireless communication device 100, the control unit 220 randomly selects a timing for transmitting the response signal to the wireless communication device 100 (or considers received power). Can be determined.
- each device in the fourth embodiment of the present technology is substantially the same as that of the wireless communication device 100 and the base stations 200 and 300 shown in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 13 is a diagram illustrating a configuration example of a data frame when the wireless communication device 100 according to the fourth embodiment of the present technology performs data transmission.
- the data frame shown in FIG. 13 is a modification of the data frame shown in FIG. 5, and is different in that ACK Mode 1 504 and ACK Mode 2 505 are added. That is, the preamble 501, SFD 502, terminal ID 503, and information 506 shown in FIG. 13 correspond to the preamble 401, SFD 402, terminal ID 403, and information 404 shown in FIG. 5. For this reason, here, it demonstrates centering on a different point from FIG.
- ACK Mode 1 504 is information for designating whether or not to cause the base station to execute the ACK transmission determination process (for example, each process shown in FIG. 7) shown in the first embodiment of the present technology.
- ACK Mode 1 504 can be set to 1 bit, and “0” or “1” can be assigned to determine whether or not to cause the base station to execute the ACK transmission determination process described above.
- ACK Mode2 505 is information for designating whether or not to cause the base station to execute the ACK transmission timing determination process (for example, each process shown in FIGS. 9 to 11) shown in the second embodiment of the present technology. It is.
- ACK Mode 2 505 can be set to 1 bit, and “0” or “1” can be assigned to determine whether or not to cause the base station to execute the above ACK transmission timing determination process.
- each of ACK Mode 1 504 and ACK Mode 2 505 is “ 1 "is stored.
- the wireless communication device 100 When transmitting the data frame, the wireless communication device 100 transmits the data frame including ACK Mode 1 504 and ACK Mode 2 505.
- FIG. 15 shows an operation example when the wireless communication device 100 automatically performs these designations.
- the wireless communication device 100 when the battery of the wireless communication device 100 is low, it is preferable to shorten the reception time of the wireless communication device 100. Therefore, in such a case, only the ACK transmission determination process described in the first embodiment of the present technology can be executed by the base station. As described above, by causing the base station to execute only the ACK transmission determination process described in the first embodiment of the present technology, the wireless communication device 100 receives an ACK for a short time after transmitting a data frame. You just have to wait.
- the wireless communication apparatus 100 waits for reception of ACK for a relatively long time after transmitting the data frame. The reception of ACK from the base station can be expected. Thereby, the certainty of data communication can be improved.
- the base station may execute both the ACK transmission timing determination process described in the second embodiment of the present technology and the ACK transmission determination process illustrated in the first embodiment of the present technology. it can.
- the wireless communication apparatus 100 waits for reception of ACK for a relatively long time after transmitting the data frame, but can expect reception of ACK from a plurality of base stations.
- the reliability of data communication can be increased.
- FIG. 14 is a sequence chart illustrating an example of a communication process between devices included in the communication system 10 according to the fourth embodiment of the present technology.
- FIG. 14 shows an example in which base station 200 determines to transmit ACK and base station 300 determines not to transmit ACK.
- the wireless communication device 100 performs determination processing for determining the content of ACK Mode 1 (511). For example, the content of ACK Mode 1 can be determined based on the remaining battery level.
- the wireless communication device 100 performs a determination process for determining the content of ACK Mode 2 (512). For example, the content of ACK Mode 2 can be determined based on the importance of the data frame to be transmitted.
- the wireless communication device 100 transmits a data frame including the contents of the determined ACK Mode1 and ACK Mode2 (513 to 516).
- the wireless communication device 100 sets an ACK waiting time 530 based on the determined content of the ACK Mode 2 (517).
- the base station 200 and the base station 300 that have received the data frame perform ACK transmission determination processing based on the content of ACK Mode 1 included in the received data frame (518, 524). As described above, the base station 200 determines to transmit ACK (519), and the base station 300 determines not to transmit ACK (525). Base station 300 that has decided not to transmit ACK does not perform subsequent processing.
- the base station 200 that has decided to transmit ACK performs ACK transmission timing determination processing based on the content of ACK Mode 2 included in the received data frame (520). Then, the base station 200 determines the transmission timing of ACK (521).
- the base station 200 transmits an ACK to the wireless communication apparatus 100 at the transmission timing determined by the ACK transmission timing determination process (522, 523).
- radio communication apparatus 100 can receive ACK from base station 200 within ACK wait time 530 set based on the content of ACK Mode 2 included in the transmitted data frame (523). .
- FIG. 15 is a flowchart illustrating an example of a processing procedure of communication processing by the wireless communication device 100 according to the fourth embodiment of the present technology.
- control unit 120 of the wireless communication device 100 checks the remaining battery level and determines whether the remaining battery level is greater than the threshold value TH12 (step S861). If the remaining battery level is greater than the threshold TH12 (step S861), the control unit 120 stores “0” in ACK Mode1 504 (step S862).
- the control unit 120 determines whether or not the importance of the data frame to be transmitted is greater than the threshold value TH13 (step S863).
- the importance of the data frame can be determined according to the content of the information 506 of the data frame to be transmitted, for example.
- the importance of the data frame can be, for example, five levels (for example, the lowest value is 1 and the highest value is 5).
- information with high importance for example, 4 and 5 in 5 stages
- this emergency call is information related to human life (for example, information for notifying a heart attack, information for notifying that a person has fallen).
- information with low importance is, for example, regular transmission information.
- the periodic transmission information is information regarding temperature, body temperature, position information, and illumination.
- control unit 120 stores “1” in ACK Mode2 505 (step S864).
- control unit 120 If the importance of the data frame to be transmitted is equal to or less than the threshold TH13 (step S863), the control unit 120 stores “0” in ACK Mode2 505 (step S865).
- step S861 If the remaining battery level is less than the threshold value TH12 (step S861), the control unit 120 stores “1” in ACK Mode1 504 (step S866).
- control unit 120 determines whether or not the importance of the data frame to be transmitted is greater than the threshold value TH14 (step S867).
- control unit 120 stores “1” in ACK Mode2 505 (step S868).
- control unit 120 stores “0” in ACK Mode2 505 (step S869).
- control unit 120 transmits ACK Mode 1 504 and ACK Mode 2 505 including the data frame (step S870).
- steps S861 to S870 are an example of a specifying procedure described in the claims.
- the control unit 120 sets an ACK waiting time based on the content of ACK Mode 2 505 (step S871). For example, when “0” is stored in ACK Mode2 505, a normal waiting time (for example, t1 + dt shown in FIG. 8) is set. For example, when “1” is stored in ACK Mode 2 505, a longer waiting time (for example, t2 + dt shown in FIG. 8) is set. Note that dt is a positive value.
- the control unit 120 of the wireless communication apparatus 100 specifies a determination method related to transmission of a response signal (ACK) in response to the signal. can do.
- the control unit 120 can specify a determination method for determining whether the base stations 200 and 300 transmit the response signal (ACK) to the wireless communication apparatus 100.
- the control unit 120 can specify a determination method for determining the transmission timing of the response signal (ACK).
- the control unit 120 can set the waiting time of the response signal corresponding to the determination method.
- control unit 120 can transmit the information (ACK Mode 1 and ACK Mode 2) for designating those determination methods in the signal.
- the ACK wait time can be set based on the content of ACK Mode 2 included in the transmitted data frame.
- radio communication apparatus 100 can receive ACK from the base station within the set ACK waiting time.
- the wireless communication apparatus 100 can automatically specify a determination method related to ACK transmission.
- FIG. 16 is a flowchart illustrating an example of a processing procedure of communication processing by the base station 200 according to the fourth embodiment of the present technology.
- FIG. 16 shows an operation example when the base station 200 receives a data frame transmitted from the wireless communication apparatus. Note that the operation example of the base station 300 is the same as that of the base station 200, and therefore only the base station 200 will be described here, and the description of the base station 300 will be omitted.
- control unit 220 of the base station 200 determines whether “1” is stored in the ACK Mode 1 included in the received data frame (step S881). When “0” is stored in ACK Mode 1 (step S881), the control unit 220 determines to perform ACK transmission at a normal timing (step S886).
- step S881 When “1” is stored in ACK Mode 1 (step S881), the control unit 220 performs an ACK transmission determination process (step S882). This ACK transmission determination process corresponds to each process shown in FIG.
- control unit 220 determines whether or not it is determined to transmit ACK by the ACK transmission determination process (step S883). If it is determined not to transmit ACK (step S883), the operation of the communication process is terminated.
- step S883 When it is determined to transmit ACK (step S883), the control unit 220 determines whether “1” is stored in ACK Mode2 included in the received data frame (step S884). When “0” is stored in ACK Mode 2 (step S884), the control unit 220 determines to perform ACK transmission at a normal timing (step S886).
- step S884 When “1” is stored in ACK Mode 2 (step S884), an ACK transmission timing determination process is performed (step S885). This ACK transmission timing determination process corresponds to each process shown in FIGS.
- each base station 200 and 300 when the signals from the wireless communication device 100 are received by the plurality of base stations 200 and 300, whether or not each base station 200 and 300 autonomously performs ACK transmission is determined. Can be determined. Also, each base station 200, 300 can autonomously determine the transmission timing when ACK transmission is performed. Thereby, interference due to ACK transmission from a plurality of base stations can be reduced.
- the wireless communication device 100 and the base stations 200 and 300 are a smartphone, a tablet PC (Personal Computer), a notebook PC, a mobile terminal such as a portable game terminal or a digital camera, a television receiver, a printer, a digital scanner, or a network storage. It may be realized as a fixed terminal such as a car-mounted terminal such as a car navigation device.
- the wireless communication device 100 and the base stations 200 and 300 are terminals (MTC (Machine Type)) that perform M2M (Machine To Machine) communication, such as smart meters, vending machines, remote monitoring devices, or POS (Point Of Sale) terminals. Communication) (also referred to as a terminal).
- the wireless communication device 100 and the base stations 200 and 300 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these terminals.
- the base stations 200 and 300 may be realized as a wireless LAN access point (also referred to as a wireless base station) having a router function or not having a router function. Further, the base stations 200 and 300 may be realized as mobile wireless LAN routers. Furthermore, the base stations 200 and 300 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these devices.
- a wireless LAN access point also referred to as a wireless base station
- the base stations 200 and 300 may be realized as mobile wireless LAN routers.
- the base stations 200 and 300 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these devices.
- FIG. 17 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied.
- the smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 913, an antenna switch 914, an antenna 915, A bus 917, a battery 918, and an auxiliary controller 919 are provided.
- the processor 901 may be, for example, a CPU (Central Processing Unit) or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900.
- the memory 902 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and stores programs and data executed by the processor 901.
- the storage 903 can include a storage medium such as a semiconductor memory or a hard disk.
- the external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
- the camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
- the sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
- the microphone 908 converts sound input to the smartphone 900 into an audio signal.
- the input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user.
- the display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900.
- the speaker 911 converts an audio signal output from the smartphone 900 into audio.
- the wireless communication interface 913 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and performs wireless communication.
- the wireless communication interface 913 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 913 can directly communicate with other devices in the ad-hoc mode or the direct communication mode such as Wi-Fi Direct.
- Wi-Fi Direct unlike the ad hoc mode, one of two terminals operates as an access point, but communication is performed directly between the terminals.
- the wireless communication interface 913 can typically include a baseband processor, an RF (Radio Frequency) circuit, a power amplifier, and the like.
- the wireless communication interface 913 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 913 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a cellular communication method in addition to the wireless LAN method.
- the antenna switch 914 switches the connection destination of the antenna 915 among a plurality of circuits (for example, circuits for different wireless communication schemes) included in the wireless communication interface 913.
- the antenna 915 includes a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the radio communication interface 913.
- the smartphone 900 is not limited to the example in FIG. 17, and may include a plurality of antennas (for example, an antenna for a wireless LAN and an antenna for a proximity wireless communication method). In that case, the antenna switch 914 may be omitted from the configuration of the smartphone 900.
- the bus 917 connects the processor 901, memory 902, storage 903, external connection interface 904, camera 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 913, and auxiliary controller 919 to each other.
- the battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 17 through a power supply line partially shown by a broken line in the drawing.
- the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.
- control unit 120 described using FIG. 3 and the control unit 220 described using FIG. 4 may be implemented in the wireless communication interface 913.
- at least a part of these functions may be implemented in the processor 901 or the auxiliary controller 919.
- the power consumption of the battery 918 can be reduced by causing the base station to perform the ACK transmission determination process by the wireless communication interface 913.
- the smartphone 900 may operate as a wireless access point (software AP) when the processor 901 executes the access point function at the application level. Further, the wireless communication interface 913 may have a wireless access point function.
- FIG. 18 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied.
- the car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication.
- An interface 933, an antenna switch 934, an antenna 935, and a battery 938 are provided.
- the processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920.
- the memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.
- the GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites.
- the sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor.
- the data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.
- the content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928.
- the input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user.
- the display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced.
- the speaker 931 outputs the navigation function or the audio of the content to be played back.
- the wireless communication interface 933 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and executes wireless communication.
- the wireless communication interface 933 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 933 can directly communicate with other devices in the ad-hoc mode or the direct communication mode such as Wi-Fi Direct.
- the wireless communication interface 933 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 933 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a cellular communication system.
- the antenna switch 934 switches the connection destination of the antenna 935 among a plurality of circuits included in the wireless communication interface 933.
- the antenna 935 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 933.
- the car navigation device 920 may include a plurality of antennas without being limited to the example of FIG. In that case, the antenna switch 934 may be omitted from the configuration of the car navigation device 920.
- the battery 938 supplies power to each block of the car navigation apparatus 920 shown in FIG. 18 through a power supply line partially shown by a broken line in the figure. Further, the battery 938 stores electric power supplied from the vehicle side.
- control unit 120 described with reference to FIG. 3 and the control unit 220 described with reference to FIG. 4 may be implemented in the wireless communication interface 933. Further, at least a part of these functions may be implemented in the processor 921. For example, the power consumption of the battery 938 can be reduced by causing the base station to perform the ACK transmission determination process by the wireless communication interface 933.
- the wireless communication interface 933 may operate as the base stations 200 and 300 described above, and provide a wireless connection to a terminal of a user who gets on the vehicle.
- the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942.
- vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
- FIG. 19 is a block diagram illustrating an example of a schematic configuration of a wireless access point 950 to which the technology according to the present disclosure can be applied.
- the wireless access point 950 includes a controller 951, a memory 952, an input device 954, a display device 955, a network interface 957, a wireless communication interface 963, an antenna switch 964, and an antenna 965.
- the controller 951 may be a CPU or a DSP (Digital Signal Processor), for example, and various functions (for example, access restriction, routing, encryption, firewall) of the IP (Internet Protocol) layer and higher layers of the wireless access point 950 And log management).
- the memory 952 includes a RAM and a ROM, and stores programs executed by the controller 951 and various control data (for example, a terminal list, a routing table, an encryption key, security settings, and a log).
- the input device 954 includes, for example, a button or a switch and receives an operation from the user.
- the display device 955 includes an LED lamp and the like, and displays the operation status of the wireless access point 950.
- the network interface 957 is a wired communication interface for connecting the wireless access point 950 to the wired communication network 958.
- the network interface 957 may have a plurality of connection terminals.
- the wired communication network 958 may be a LAN such as Ethernet (registered trademark), or may be a WAN (Wide Area Network).
- the wireless communication interface 963 supports one or more of wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and provides a wireless connection as an access point to nearby terminals.
- the wireless communication interface 963 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 963 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the antenna switch 964 switches the connection destination of the antenna 965 among a plurality of circuits included in the wireless communication interface 963.
- the antenna 965 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 963.
- the control unit 220 described with reference to FIG. 4 may be implemented in the wireless communication interface 963.
- at least a part of these functions may be implemented in the controller 951.
- the wireless communication interface 963 performs the ACK transmission determination process, the power consumption of the battery of the wireless communication device can be reduced.
- the processing procedure described in the above embodiment may be regarded as a method having a series of these procedures, and a program for causing a computer to execute these series of procedures or a recording medium storing the program. You may catch it.
- a recording medium for example, a CD (Compact Disc), an MD (MiniDisc), a DVD (Digital Versatile Disc), a memory card, a Blu-ray disc (Blu-ray (registered trademark) Disc), or the like can be used.
- An information processing apparatus comprising: a control unit that autonomously controls transmission of a response signal that responds to the signal to the wireless communication apparatus when receiving a signal from the wireless communication apparatus using wireless communication.
- a control unit determines whether to transmit the response signal to the wireless communication apparatus based on a received signal strength of the signal.
- the control unit determines whether to transmit the response signal to the wireless communication device using a determination method based on a comparison result between a received signal strength of the signal and a threshold value and a determination method that randomly determines the response signal.
- the control unit determines whether to transmit the response signal to the wireless communication device based on a received signal strength of the signal, and when it is determined to transmit the response signal to the wireless communication device.
- the information processing apparatus or wireless communication apparatus according to any one of (1) to (7), wherein a timing for transmitting the response signal to the wireless communication apparatus is determined at random.
- a determination method for determining whether or not the information processing device transmits a response signal in response to the signal to the wireless communication device and the response signal A wireless communication apparatus comprising a control unit that specifies at least one of a determination method for determining transmission timing.
- the wireless communication apparatus according to (9), wherein the control unit includes information for designating the determination method and transmits the information.
- the control unit according to (9) or (10), wherein when the determination method for determining the transmission timing is designated, the control unit sets a waiting time for the response signal corresponding to the determination method.
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Abstract
Description
1.第1の実施の形態(ACK送信するか否かを基地局毎に決定する例)
2.第2の実施の形態(ACKを送信するタイミングを基地局毎に決定する例)
3.第3の実施の形態(ACK送信するか否かを決定し、ACK送信をすると決定された場合に、ACKを送信するタイミングを決定する例)
4.第4の実施の形態(ACK送信に関する決定方法を無線通信装置側で指定する例)
5.応用例
[通信システムの構成例]
図1および図2は、本技術の第1の実施の形態における通信システム10のシステム構成例を示す図である。
図3は、本技術の第1の実施の形態における無線通信装置100の機能構成例を示すブロック図である。
図4は、本技術の第1の実施の形態における基地局200の機能構成例を示すブロック図である。なお、基地局300の機能構成については、基地局200と同一であるため、ここでは、基地局200についてのみ説明し、基地局300の説明を省略する。
図5は、本技術の第1の実施の形態における無線通信装置100がデータ送信を行う場合におけるデータフレームの構成例を示す図である。図5では、通信方式として、無線LANを用いる場合におけるデータフレームの構成例を示す。
図6は、本技術の第1の実施の形態における通信システム10を構成する各装置と各装置間で送受信される情報との関係を時系列で示す図である。なお、図6において、横軸は時間軸を示す。また、各装置により送信されるデータを、時間軸上の実線の矩形で模式的に表し、各装置により受信されるデータを、時間軸上の点線の矩形で模式的に表す。
図7は、本技術の第1の実施の形態における基地局200による通信処理の処理手順の一例を示すフローチャートである。図7では、基地局200が、無線通信装置100から送信されたデータフレームを受信した場合における動作例を示す。なお、基地局300の動作例については、基地局200と同一であるため、ここでは、基地局200についてのみ説明し、基地局300の説明を省略する。
本技術の第1の実施の形態では、ACK送信するか否かを基地局毎に決定する例を示した。本技術の第2の実施の形態では、ACKを送信するタイミングを基地局毎に決定する例を示す。
図8は、本技術の第2の実施の形態における通信システム10を構成する各装置と各装置間で送受信される情報との関係を時系列で示す図である。なお、図8において、横軸は時間軸を示す。また、各装置により送信されるデータを、時間軸上の実線の矩形で模式的に表し、各装置により受信されるデータを、時間軸上の点線の矩形で模式的に表す。
図9は、本技術の第2の実施の形態における基地局200による通信処理の処理手順の一例を示すフローチャートである。図9では、基地局200が、無線通信装置から送信されたデータフレームを受信した場合における動作例を示す。また、図9では、受信したデータフレームに対するACKを送信するタイミングをランダムに決定する例を示す。また、図9では、基地局200の周囲に存在する基地局が2つの場合の例を示す。なお、基地局300の動作例については、基地局200と同一であるため、ここでは、基地局200についてのみ説明し、基地局300の説明を省略する。
図9では、基地局200の周囲に存在する基地局が2つの場合の例を示した。ただし、基地局200の周囲に存在する基地局が3以上の場合についても、本技術の第2の実施の形態を適用することができる。そこで、図10では、基地局200の周囲に存在する基地局が3以上の場合の動作例について説明する。
図9および図10では、受信したデータフレームに対するACKを送信するタイミングをランダムに決定する例を示した。ただし、そのデータフレームの受信電力を考慮して、ACKを送信するタイミングをランダムに決定するようにしてもよい。この例を図11に示す。
本技術の第1の実施の形態では、ACK送信するか否かを基地局毎に決定する例を示した。また、本技術の第2の実施の形態では、ACKを送信するタイミングを基地局毎に決定する例を示した。
図12は、本技術の第3の実施の形態における基地局200による通信処理の処理手順の一例を示すフローチャートである。図12では、基地局200が、無線通信装置から送信されたデータフレームを受信した場合における動作例を示す。なお、基地局300の動作例については、基地局200と同一であるため、ここでは、基地局200についてのみ説明し、基地局300の説明を省略する。
本技術の第1乃至第3の実施の形態では、ACK送信に関する各決定処理を基地局の制御に基づいて行う例を示した。ここで、例えば、ACK送信に関する決定方法を無線通信装置側で指定することも考えられる。
図13は、本技術の第4の実施の形態における無線通信装置100がデータ送信を行う場合におけるデータフレームの構成例を示す図である。なお、図13に示すデータフレームは、図5に示すデータフレームの変形例であり、ACK Mode1 504およびACK Mode2 505を追加した点が異なる。すなわち、図13に示すPreamble501、SFD502、端末ID503および情報506は、図5に示すPreamble401、SFD402、端末ID403および情報404に対応する。このため、ここでは、図5と異なる点を中心にして説明する。
図14は、本技術の第4の実施の形態における通信システム10を構成する各装置間における通信処理例を示すシーケンスチャートである。なお、図14では、基地局200がACKを送信することを決定し、基地局300がACKを送信しないことを決定する場合の例を示す。
図15は、本技術の第4の実施の形態における無線通信装置100による通信処理の処理手順の一例を示すフローチャートである。
図16は、本技術の第4の実施の形態における基地局200による通信処理の処理手順の一例を示すフローチャートである。図16では、基地局200が、無線通信装置から送信されたデータフレームを受信した場合における動作例を示す。なお、基地局300の動作例については、基地局200と同一であるため、ここでは、基地局200についてのみ説明し、基地局300の説明を省略する。
本開示に係る技術は、様々な製品へ応用可能である。例えば、無線通信装置100、基地局200、300は、スマートフォン、タブレットPC(Personal Computer)、ノートPC、携帯型ゲーム端末若しくはデジタルカメラなどのモバイル端末、テレビジョン受像機、プリンタ、デジタルスキャナ若しくはネットワークストレージなどの固定端末、又はカーナビゲーション装置などの車載端末として実現されてもよい。また、無線通信装置100、基地局200、300は、スマートメータ、自動販売機、遠隔監視装置又はPOS(Point Of Sale)端末などの、M2M(Machine To Machine)通信を行う端末(MTC(Machine Type Communication)端末ともいう)として実現されてもよい。さらに、無線通信装置100、基地局200、300は、これら端末に搭載される無線通信モジュール(例えば、1つのダイで構成される集積回路モジュール)であってもよい。
図17は、本開示に係る技術が適用され得るスマートフォン900の概略的な構成の一例を示すブロック図である。スマートフォン900は、プロセッサ901、メモリ902、ストレージ903、外部接続インタフェース904、カメラ906、センサ907、マイクロフォン908、入力デバイス909、表示デバイス910、スピーカ911、無線通信インタフェース913、アンテナスイッチ914、アンテナ915、バス917、バッテリー918及び補助コントローラ919を備える。
図18は、本開示に係る技術が適用され得るカーナビゲーション装置920の概略的な構成の一例を示すブロック図である。カーナビゲーション装置920は、プロセッサ921、メモリ922、GPS(Global Positioning System)モジュール924、センサ925、データインタフェース926、コンテンツプレーヤ927、記憶媒体インタフェース928、入力デバイス929、表示デバイス930、スピーカ931、無線通信インタフェース933、アンテナスイッチ934、アンテナ935及びバッテリー938を備える。
図19は、本開示に係る技術が適用され得る無線アクセスポイント950の概略的な構成の一例を示すブロック図である。無線アクセスポイント950は、コントローラ951、メモリ952、入力デバイス954、表示デバイス955、ネットワークインタフェース957、無線通信インタフェース963、アンテナスイッチ964及びアンテナ965を備える。
(1)
無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する制御部を具備する情報処理装置。
(2)
前記制御部は、前記信号の受信信号強度に基づいて、前記応答信号を前記無線通信装置に送信するか否かを決定する前記(1)に記載の情報処理装置。
(3)
前記制御部は、前記信号の受信信号強度と閾値との比較結果に基づく決定方法とランダムに決定する決定方法とを用いて、前記応答信号を前記無線通信装置に送信するか否かを決定する前記(1)または(2)に記載の情報処理装置。
(4)
前記制御部は、前記応答信号を前記無線通信装置に送信するか否かをランダムに決定する前記(1)から(3)のいずれかに記載の情報処理装置。
(5)
前記制御部は、前記信号の受信信号強度が所定範囲内の値である場合には、前記応答信号を前記無線通信装置に送信するか否かをランダムに決定する前記(4)に記載の情報処理装置。
(6)
前記制御部は、前記応答信号を前記無線通信装置に送信するタイミングをランダムに決定する前記(1)から(5)のいずれかに記載の情報処理装置。
(7)
前記制御部は、前記信号の受信信号強度と閾値との比較結果に基づく決定方法とランダムに決定する決定方法とを用いて、前記応答信号を前記無線通信装置に送信するタイミングを決定する前記(6)に記載の情報処理装置、無線通信装置。
(8)
前記制御部は、前記信号の受信信号強度に基づいて前記応答信号を前記無線通信装置に送信するか否かを決定し、前記応答信号を前記無線通信装置に送信することが決定された場合に、前記応答信号を前記無線通信装置に送信するタイミングをランダムに決定する前記(1)から(7)のいずれかに記載の情報処理装置、無線通信装置。
(9)
無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が当該無線通信装置に送信するか否かを決定する決定方法と前記応答信号の送信タイミングを決定する決定方法とのうちの少なくとも1つを指定する制御部を具備する無線通信装置。
(10)
前記制御部は、前記決定方法を指定するための情報を前記信号に含めて送信する前記(9)に記載の無線通信装置。
(11)
前記制御部は、前記送信タイミングを決定する決定方法を指定した場合には、当該決定方法に対応する前記応答信号の待ち時間を設定する前記(9)または(10)に記載の無線通信装置。
(12)
無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する情報処理方法。
(13)
無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が自装置に送信するか否かと当該送信タイミングとのうちの少なくとも1つを前記情報処理装置が決定する決定方法を指定する情報処理方法。
(14)
無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する手順をコンピュータに実行させるプログラム。
(15)
無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が自装置に送信するか否かと当該送信タイミングとのうちの少なくとも1つを前記情報処理装置が決定する決定方法を指定する手順をコンピュータに実行させるプログラム。
100 無線通信装置
110 通信部
120 制御部
130 記憶部
140 操作受付部
150 表示部
160 電源供給部
200、300 基地局
210 通信部
220 制御部
230 記憶部
900 スマートフォン
901 プロセッサ
902 メモリ
903 ストレージ
904 外部接続インタフェース
906 カメラ
907 センサ
908 マイクロフォン
909 入力デバイス
910 表示デバイス
911 スピーカ
913 無線通信インタフェース
914 アンテナスイッチ
915 アンテナ
917 バス
918 バッテリー
919 補助コントローラ
920 カーナビゲーション装置
921 プロセッサ
922 メモリ
924 GPSモジュール
925 センサ
926 データインタフェース
927 コンテンツプレーヤ
928 記憶媒体インタフェース
929 入力デバイス
930 表示デバイス
931 スピーカ
933 無線通信インタフェース
934 アンテナスイッチ
935 アンテナ
938 バッテリー
941 車載ネットワーク
942 車両側モジュール
950 無線アクセスポイント
951 コントローラ
952 メモリ
954 入力デバイス
955 表示デバイス
957 ネットワークインタフェース
958 有線通信ネットワーク
963 無線通信インタフェース
964 アンテナスイッチ
965 アンテナ
Claims (15)
- 無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する制御部を具備する情報処理装置。
- 前記制御部は、前記信号の受信信号強度に基づいて、前記応答信号を前記無線通信装置に送信するか否かを決定する請求項1記載の情報処理装置。
- 前記制御部は、前記信号の受信信号強度と閾値との比較結果に基づく決定方法とランダムに決定する決定方法とを用いて、前記応答信号を前記無線通信装置に送信するか否かを決定する請求項1記載の情報処理装置。
- 前記制御部は、前記応答信号を前記無線通信装置に送信するか否かをランダムに決定する請求項1記載の情報処理装置。
- 前記制御部は、前記信号の受信信号強度が所定範囲内の値である場合には、前記応答信号を前記無線通信装置に送信するか否かをランダムに決定する請求項4記載の情報処理装置。
- 前記制御部は、前記応答信号を前記無線通信装置に送信するタイミングをランダムに決定する請求項1記載の情報処理装置。
- 前記制御部は、前記信号の受信信号強度と閾値との比較結果に基づく決定方法とランダムに決定する決定方法とを用いて、前記応答信号を前記無線通信装置に送信するタイミングを決定する請求項6記載の情報処理装置。
- 前記制御部は、前記信号の受信信号強度に基づいて前記応答信号を前記無線通信装置に送信するか否かを決定し、前記応答信号を前記無線通信装置に送信することが決定された場合に、前記応答信号を前記無線通信装置に送信するタイミングをランダムに決定する請求項1記載の情報処理装置。
- 無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が当該無線通信装置に送信するか否かを決定する決定方法と前記応答信号の送信タイミングを決定する決定方法とのうちの少なくとも1つを指定する制御部を具備する無線通信装置。
- 前記制御部は、前記決定方法を指定するための情報を前記信号に含めて送信する請求項9記載の無線通信装置。
- 前記制御部は、前記送信タイミングを決定する決定方法を指定した場合には、当該決定方法に対応する前記応答信号の待ち時間を設定する請求項9記載の無線通信装置。
- 無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する情報処理方法。
- 無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が自装置に送信するか否かと当該送信タイミングとのうちの少なくとも1つを前記情報処理装置が決定する決定方法を指定する情報処理方法。
- 無線通信を利用した無線通信装置からの信号を受信した場合に、前記信号に応答する応答信号の前記無線通信装置への送信を自律的に制御する手順をコンピュータに実行させるプログラム。
- 無線通信を利用して情報処理装置に信号を送信する場合に、前記信号に応答する応答信号を前記情報処理装置が自装置に送信するか否かと当該送信タイミングとのうちの少なくとも1つを前記情報処理装置が決定する決定方法を指定する手順をコンピュータに実行させるプログラム。
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EP3236689B1 (en) | 2019-06-19 |
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