WO2020217839A1 - 通信装置、制御方法、及び、プログラム - Google Patents

通信装置、制御方法、及び、プログラム Download PDF

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Publication number
WO2020217839A1
WO2020217839A1 PCT/JP2020/013585 JP2020013585W WO2020217839A1 WO 2020217839 A1 WO2020217839 A1 WO 2020217839A1 JP 2020013585 W JP2020013585 W JP 2020013585W WO 2020217839 A1 WO2020217839 A1 WO 2020217839A1
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Prior art keywords
communication device
signal
conforming
series standard
communication
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English (en)
French (fr)
Japanese (ja)
Inventor
亮 渡邊
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Canon Inc
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Canon Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Leader-follower arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to an interference suppression technique in wireless communication conforming to the IEEE 802.11 series standard.
  • OFDMA Orthogonal frequency-division multiple access
  • IEEE802.11 EHT Extreme High Throughput
  • an object of the present invention is to reduce interference with other wireless systems when performing communication conforming to the IEEE802.11 series standard in the 6 GHz band.
  • the communication device of the present invention is a first determining means for determining whether or not a signal different from a signal conforming to the IEEE (Institute of Electrical and Electronics Engineers) 802.11 series standard exists in the 6 GHz band.
  • the communication device communicates on a predetermined frequency channel included in the 6 GHz band, the presence of a signal different from the signal conforming to the IEEE 802.11 series standard is determined by the first determination means.
  • a control means for controlling so as not to transmit a signal conforming to the IEEE802.11 series standard in the predetermined frequency channel.
  • Network configuration diagram Hardware configuration diagram of the communication device.
  • FIG. 1 shows a network configuration diagram of this embodiment.
  • the AP102 is an access point for constructing a wireless network 101 conforming to the IEEE (Institute of Electrical and Electronics Engineers) 802.11be standard.
  • the IEEE802.11be standard is a standard established by the Study Group of IEEE802.11 EHT. Here, EHT is an abbreviation for Extreme High Throughput.
  • the AP102 is an access point (Access Point) compliant with the IEEE802.11be standard, and transmits and receives various wireless signals compliant with the IEEE802.11 series standard.
  • the STA 103 is a station that wirelessly connects to the AP102 and communicates in the wireless network 101.
  • the AP102 is not limited to the access point, and may be a Group Owner compliant with the Wi-Fi Direct standard, and can be referred to as a base station.
  • the STA 103 may be a Client conforming to the Wi-Fi Direct standard, and can be referred to as a slave station.
  • the base station and the slave station are collectively referred to as a communication device.
  • this network configuration is an example, and may include, for example, a larger number of EHT-compatible, that is, EHT-compliant communication devices and legacy devices. Further, the positional relationship of the communication device is not limited to the configuration shown in FIG. 1, and the positional relationship may change dynamically.
  • the legacy device is a communication device that supports at least one of IEEE802.11a, b, g, n, ac, and ax and does not support EHT.
  • FIG. 2 shows the hardware configuration of the communication device (each of AP102 and STA103) according to this embodiment.
  • the communication device includes a storage unit 201, a control unit 202, a function unit 203, an input unit 204, an output unit 205, a communication unit 206, and wireless antennas (hereinafter, simply referred to as antennas) 207 and 208.
  • antennas hereinafter, simply referred to as antennas
  • the storage unit 201 is composed of one or more memories such as ROM and RAM, and stores various information such as a computer program for performing various operations described later and communication parameters for wireless communication.
  • ROM is an abbreviation for Read Only Memory
  • RAM is an abbreviation for Random Access Memory.
  • storage media such as flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, CD-Rs, magnetic tapes, non-volatile memory cards, and DVDs. May be used.
  • the control unit 202 is composed of one or more processors such as a CPU and an MPU, and controls the entire communication device by executing a computer program stored in the storage unit 201.
  • the CPU is an abbreviation for Central Processing Unit
  • the MPU is an abbreviation for Micro Processing Unit, which functions as a computer.
  • the control unit 202 may control the entire communication device by cooperating with the OS and the program stored in the storage unit 201.
  • the control unit 202 may include a plurality of processors such as a multi-core processor, and the plurality of processors may control the entire communication device. Further, it may be configured to include an ASIC (application specific integrated circuit), a DSP (digital signal processor), an FPGA (field programmable gate array), and the like.
  • the control unit 202 controls the function unit 203 to execute predetermined processing such as imaging, printing, and projection.
  • the functional unit 203 is hardware for the communication device to execute a predetermined process.
  • the functional unit 203 is an imaging unit and performs imaging processing.
  • the functional unit 203 is a printing unit and performs printing processing.
  • the functional unit 203 is a projection unit and performs projection processing.
  • the data processed by the functional unit 203 may be data stored in the storage unit 201, or may be data communicated with another communication device via the communication unit 206 described later.
  • the communication device may be configured not to have the functional unit 203.
  • Input unit 204 accepts various operations from the user.
  • the output unit 205 outputs various outputs to the user.
  • the output by the output unit 205 includes at least one of a display on the screen, an audio output by the speaker, a vibration output, and the like.
  • both the input unit 204 and the output unit 205 may be realized by one module like a touch panel. Further, the configuration may not have the input unit 204 and the output unit 205.
  • the communication unit 206 controls wireless communication and IP communication in accordance with the IEEE802.11 series standard. In addition, the communication unit 206 controls the antennas 207 and 208 to transmit and receive wireless signals for wireless communication.
  • the communication device communicates contents such as image data, document data, and video data with other communication devices via the communication unit 206.
  • the communication device is not limited to a configuration having a plurality of antennas, and may have a configuration having only one antenna.
  • Antennas 207 and 208 are antennas capable of transmitting and receiving radio signals in at least one of 2.4 GHz band, 3.6 GHz band, 4.9 and 5 GHz band, 6 GHz band and 60 GHz band, and the combination of corresponding frequency bands is Not limited. However, at least one of the antennas 207 and 208 can transmit and receive radio signals in the 6 GHz band. Further, the communication device may be capable of performing MIMO (Multi-Input and Multi-Output) communication using the antennas 207 and 208.
  • MIMO Multi-Input and Multi-Output
  • FIG. 3 shows a flowchart realized by AP102.
  • the flowchart shown in FIG. 3 is started when the power of the AP102 is turned on. It should be noted that the power is not limited to the power-on, and may be started when the start of the 6 GHz band wireless communication is instructed by a user operation or the like.
  • the flowchart shown in FIG. 3 is realized by the control unit 202 reading and executing the program stored in the storage unit 201 of the AP 102.
  • a configuration may be configured in which some or all of the steps shown in the flowchart of FIG. 3 are realized by hardware such as ASIC.
  • ASIC is an abbreviation for Application Special Integrated Circuit.
  • AP102 sets the frequency channel used for communication in the 6 GHz band (S301). Specifically, a frequency channel set by the user, a frequency channel selected by AP102, or a default frequency channel is set. When the AP102 selects a frequency channel, for example, a frequency channel may be randomly selected, or a frequency channel that is not congested by radio may be selected.
  • each frequency channel waits for a signal conforming to the IEEE802.11 series standard for a predetermined time, and the number of times the signal is received and the total length of receiving the signal are calculated. There is a way to measure. In this case, the frequency channel with a smaller number of times or the frequency channel with the shorter total length of receiving the signal is selected as the frequency channel with less congestion of the radio. Further, the information of the frequency channel on which another AP is constructing the wireless network may be acquired to acquire the radio congestion status. Information on frequency channels on which other APs are building wireless networks is acquired by transmitting and receiving signals conforming to the Wi-Fi EASY MESH standard, in addition to being acquired by beacons transmitted from other APs. May be good.
  • the AP102 controls so that a signal transmitted by another wireless system can be detected when acquiring the radio congestion status, and when the signal is detected, the frequency channel that detected the signal is excluded.
  • the frequency channel may be selected.
  • the designated frequency section is, for example, a section from 5.925 GHz to 6.425 GHz, a section from 6.425 GHz to 6.525 GHz, a section from 6.525 GHz to 6.875 GHz, and a section from 6.875 GHz to 7.125 GHz. Is. Note that only a part of these plurality of sections may be designated as a designated frequency section.
  • the current position information of the AP102 may be acquired by GPS or the like, and the section derived from the position information according to the regulation of the country or region to which the AP102 belongs may be set as the designated frequency section.
  • GPS is an abbreviation for Global Positioning System.
  • the designated frequency section may be a section from 5.925 GHz to 7.125 GHz, which is the entire section of the 6 GHz band.
  • step S306 If the set frequency channel is not included in the designated frequency section (No in S302), the process proceeds to step S306 described later.
  • the AP102 determines for a predetermined time whether or not there is a signal transmitted by another wireless system on the set frequency channel (S303). .. It should be noted that the AP102 does not transmit a signal conforming to the IEEE802.11 series standard at least on the frequency channel until the determination is completed. This is to prevent interference with other wireless systems.
  • the AP102 may measure the energy in the set frequency channel and determine whether the energy exceeds a predetermined threshold value. That is, when the energy exceeding the predetermined threshold is measured, it is determined that there is a signal transmitted by the other wireless system, and when the energy exceeding the predetermined threshold is not measured, the other wireless system determines that there is a signal to be transmitted. Determine that there is no signal to transmit.
  • the AP102 can identify signals conforming to the IEEE802.11 series standard. Therefore, while receiving a signal conforming to the IEEE802.11 series standard, the determination is made by excluding the energy of the signal, or the determination is not made during the period of receiving the signal, so that the AP102 is another wireless system. Can determine the presence or absence of a signal transmitted by.
  • the AP102 determines whether the frequency channel set in step S301 is a channel set by the user (S304). If the channel is not set by the user (No in S304), the process returns to step S301, and AP102 reselects the frequency channel to be set. In this case, the frequency channels that are determined to have signals transmitted by other wireless systems are excluded from the selected frequency channel candidates.
  • the process returns to step S301 immediately, but the process may return to step S301 after waiting for a predetermined time to elapse. If it waits for the predetermined time to elapse, it is not necessary to exclude the frequency channel determined to have a signal transmitted by another wireless system. This is because the surrounding radio conditions may change with the passage of time, and in such a case, communication may be possible on the same frequency channel.
  • the AP102 ends the process shown in FIG. 3 without transmitting a signal conforming to the IEEE802.11 series standard (S305).
  • the user may be notified that communication conforming to the IEEE802.11 series standard, that is, Wi-Fi communication cannot be performed.
  • the process may be returned to step S301 and the AP102 may restart the process. In this case, it is not necessary to exclude the frequency channel determined to have a signal transmitted by another wireless system from the selected frequency channel candidates. This is because the surrounding wireless condition may have changed after a predetermined time has passed.
  • the process may return to step S301 and the AP102 may reselect the frequency channel to be set. For example, if the user has previously set a frequency channel to be used when a signal of another wireless system exists, the process may return to step S301. Further, for example, if a mode for automatically changing the frequency channel is set when a signal of another wireless system is present, the process may return to step S301. Further, for example, after returning to step S301, the user may be made to newly select a frequency channel different from the frequency channel in which the signal of the other wireless system exists.
  • the process may return to step S301 without determining step S304.
  • the frequency channel determined to have a signal transmitted by another wireless system is excluded from the selected frequency channel candidates.
  • the process returns to step S301 immediately, but the process may return to step S301 after waiting for a predetermined time to elapse. If it waits for the predetermined time to elapse, it is not necessary to exclude the frequency channel determined to have a signal transmitted by another wireless system.
  • the AP102 starts transmitting a signal conforming to the IEEE802.11 series standard on the set frequency channel, and constructs the wireless network 101 (S306).
  • the signal transmitted here is, for example, a Beacon frame conforming to the IEEE802.11 series standard.
  • the Beacon frame is transmitted every cycle (for example, 100 milliseconds) specified by the Beacon Interval, and includes SSID which is identification information of the wireless network 101 and information of a set frequency channel (operating channel).
  • the frequency channel information is included in the Beacon frame as an element of the DSSS Parameter Set.
  • SSID is an abbreviation for Service Set Identifier.
  • DSSS is an abbreviation for Direct Sequence Spread Spectrum.
  • the frequency channel information may be included in the Beacon frame as another element, or may be included in another frame (Probe Response, etc.) different from the Beacon frame.
  • the AP102 also transmits signals such as Probe Response, Association Response, and Response Response frames conforming to the IEEE 802.11 series standard on the frequency channel. For example, when a probe request frame conforming to the IEEE802.11 series standard, which is a search signal, is received from the STA 103, the AP102 transmits a probe response frame, which is a search response signal. Further, when receiving an Association Request frame conforming to the IEEE802.11 series standard which is a connection request signal from the STA103, the AP102 transmits an Association Response frame which is a connection response signal. In this way, the wireless connection between the AP 102 and the STA 103 is established (S307), and wireless communication can be performed via the wireless network 101.
  • signals such as Probe Response, Association Response, and Response Response Response frames conforming to the IEEE 802.11 series standard on the frequency channel. For example, when a probe request frame conforming to the IEEE802.11 series standard, which is a search signal, is received from the STA 103, the AP102 transmits a probe
  • processing such as WPA (Wi-Fi Protected Access), WPA2, WPA3 may be further performed.
  • WPA Wi-Fi Protected Access
  • WPA2 Wi-Fi Protected Access
  • WPA3 Wi-Fi Protected Access
  • the wireless connection is established in this way, data communication is performed between the AP102 and the STA103 via the wireless network 101 in the 6 GHz band by transmitting and receiving signals conforming to the IEEE802.11 series standard (S308). .. Since the legacy device does not transmit / receive signals conforming to the IEEE802.11 series standard in the 6 GHz band, signals conforming to the standard of IEEE802.11be or later are used here.
  • the AP102 can start communication conforming to the IEEE802.11 series standard while preventing interference with other wireless systems that use the 6 GHz band.
  • the user may be notified to that effect. As a result, the convenience of the user can be enhanced.
  • the AP102 may communicate using a plurality of frequency channels in the 6 GHz band.
  • AP102 confirms that all or part of the plurality of frequency channels are included in the designated frequency section. Then, the presence or absence of a signal transmitted by another wireless system over one or more frequency channels included in the designated frequency section is determined for a predetermined time. In this way, even when a plurality of frequency channels are used in the 6 GHz band, communication conforming to the IEEE802.11 series standard can be started while preventing interference with other wireless systems.
  • the AP102 may perform other communication using the 2.4 GHz band or the 5 GHz band in parallel. That is, in addition to the 6 GHz band wireless network 101, the AP 102 also constructs another wireless network using the 2.4 GHz band and the 5 GHz band.
  • the AP102 uses a frequency channel in a band different from W53 and W56 in the 5 GHz band to perform other communication. Control. That is, control is performed so that other communication is performed using a frequency channel in a band different from the band that requires DFS (Dynamic Frequency Selection) for determining the presence or absence of a radar signal in the 5 GHz band.
  • DFS Dynamic Frequency Selection
  • the AP102 can start other communication using the 2.4 GHz band or the like in advance while determining the presence / absence of a signal of another wireless system in the 6 GHz band. Therefore, it is possible to start communication with the STA103 in accordance with the IEEE802.11 series standard at an early stage, and the convenience of the user is improved.
  • the AP102 when the AP102 performs communication with the STA103 in the 6 GHz band and other communication using the 2.4 GHz band or the 5 GHz band in parallel in this way, the communication method in each frequency band is dynamically changed. May be changed to.
  • the AP102 first establishes a wireless connection with the STA103, and in the other communications, uplink and downlink communications are performed.
  • the uplink communication means a communication for transmitting data from the STA 103 to the AP 102.
  • downlink communication refers to communication for transmitting data from AP102 to STA103.
  • the communication in the 6 GHz band may be used exclusively for the downlink communication, and the other communication may be used exclusively for the uplink communication.
  • the communication in the 6 GHz band may be used exclusively for the uplink communication, and the other communication may be used exclusively for the downlink communication.
  • the AP102 transmits a beacon in the 2.4 GHz band or the 5 GHz band.
  • information indicating that the beacon is constructing a wireless network in the 6 GHz band or that communication in the 6 GHz band is possible. May be included.
  • the beacon may include the information of the frequency channel determined that there is no signal of another wireless system. The beacon does not include the information until it is determined that there is no signal of another wireless system in the 6 GHz band. By doing so, the AP102 can share the available frequency channel of the 6 GHz band with the STA communicating in the 2.4 GHz band or the like at an appropriate timing.
  • the AP102 may perform other communication using the W53 and W56 frequency channels in the 5 GHz band.
  • the AP102 performs a DFS-based determination process for determining the presence or absence of a radar signal in the 5 GHz band in parallel with the determination process for the presence or absence of signals from another wireless system in the 6 GHz band in step S303.
  • communication conforming to the STA103 and the IEEE802.11 series standard can be started earlier than in the case where the presence / absence of signals of other wireless systems in the 6 GHz band and the DFS processing are sequentially performed.
  • the AP102 may perform the same processing as in step S303 continuously or periodically after the start of data communication in step S308.
  • the AP102 transmits a Beacon frame or the like and performs data communication until it is determined that a signal of another wireless system exists.
  • the AP102 stops the transmission of the signal conforming to the IEEE802.11 series standard.
  • the AP 102 may notify the connected STA 103 of the stop of signal transmission conforming to the IEEE802.11 series standard, and then stop the signal transmission.
  • the notification may be performed including the information of the frequency channel to be newly used. ..
  • the STA 103 can know which frequency channel can continue the communication with the AP 102, and can shorten the time during which the communication is disconnected. This improves user convenience. Further, when a signal of another wireless system is present, the user may be notified to that effect or that the communication will be stopped. Even in this way, the convenience of the user is improved.
  • the frequency channel used for data communication is outside the designated frequency section (No in S302), AP102 does not need to perform the same processing as in step S303 even after the start of data communication. ..
  • the processing in steps S302 and S303 may be omitted and the process may proceed from step S301 to S306. .
  • the AP102 starts transmitting a signal conforming to the IEEE802.11 series standard without determining the existence of a signal of another wireless system before starting signal transmission.
  • the AP102 can start data communication with the STA103 earlier, which improves the convenience of the user.
  • the 6 GHz band even if the existence determination of the signal of another wireless system before the start of signal transmission is omitted, the AP102 shall perform DFS before the start of signal transmission in the 5 GHz band. Even with such a configuration, it is possible to perform flexible communication with other wireless systems with reduced interference.
  • the presence / absence of a signal of another wireless system is determined. You may judge. In this case, when the presence of a signal of another wireless system is determined in the 6 GHz band, the communication in the 6 GHz band is stopped and the communication in the other frequency band is continued. Further, for example, when communication in the 6 GHz band is used exclusively for downlink communication and other communication is used exclusively for uplink communication, if the presence of a signal of another wireless system is determined in the 6 GHz band, it is determined in the 6 GHz band. Stop communication. Then, in the other communication, it may be controlled to perform uplink and downlink communication.
  • the existence of signals of other wireless systems is determined in the 6 GHz band, and the radar signal is detected by DFS in the 5 GHz band. May be determined to be present. This is a case where communication is performed in W53 or W56 in the 5 GHz band as another communication. In such a case, when the presence of a signal of another wireless system is determined in the 6 GHz band or 5 GHz band, the user is notified that the communication speed is reduced due to the influence of the other wireless system. May be good.
  • the same notification is given regardless of whether the presence of a signal of another wireless system is determined in the 6 GHz band or the presence of a radar signal is determined by DFS in the 5 GHz band. May be good.
  • the AP102 may notify the STA 103 to that effect.
  • the STA 103 notifies whether the presence or absence of a signal of another wireless system is determined in the 6 GHz band or the 5 GHz band. As a result, the STA 103 can stop communication in an appropriate frequency band even when communicating with the AP 102 using a plurality of frequency bands.
  • the AP102 has been described as realizing the flowchart shown in FIG.
  • the present invention is not limited to this, and the STA 103 may perform the same processing.
  • step S301 the frequency channel of the wireless network 101 constructed by the AP 102 to be connected is set.
  • the STA 103 may store the frequency channel of the wireless network 101 in advance, or may acquire the frequency channel of the wireless network 101 by performing an all-channel scan.
  • the passive scan the STA 103 does not transmit a probe request frame or the like conforming to the IEEE802.11 series standard.
  • step S306 the STA 103 does not transmit the Beacon frame, but starts transmitting the search signal.
  • step S307 the connection process with the AP102 is performed by transmitting the connection request signal and receiving the response signal.
  • the STA 103 may include the frequency channel information in the search signal (Probe Request frame) or the connection request signal (Association Request frame) as an element of the DSSS Parameter Set.
  • the present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

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  • Computer Security & Cryptography (AREA)
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