WO2021100695A1 - 通信装置、情報処理装置、制御方法、及び、プログラム - Google Patents

通信装置、情報処理装置、制御方法、及び、プログラム Download PDF

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Publication number
WO2021100695A1
WO2021100695A1 PCT/JP2020/042766 JP2020042766W WO2021100695A1 WO 2021100695 A1 WO2021100695 A1 WO 2021100695A1 JP 2020042766 W JP2020042766 W JP 2020042766W WO 2021100695 A1 WO2021100695 A1 WO 2021100695A1
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Prior art keywords
frame
communication
communication device
sta
frequency resource
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English (en)
French (fr)
Japanese (ja)
Inventor
裕彦 猪膝
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Canon Inc
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Canon Inc
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Priority to CN202080078429.6A priority Critical patent/CN114747242B/zh
Priority to KR1020227019410A priority patent/KR102853557B1/ko
Publication of WO2021100695A1 publication Critical patent/WO2021100695A1/ja
Priority to US17/742,491 priority patent/US12426072B2/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • 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
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • 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 generally relates to a communication device, an information processing device, a control method, and a program, and specifically to an information processing technique for allocating frequency resources in wireless communication.
  • the IEEE 802.11 standard series is known as a major communication standard for wireless LAN.
  • the IEEE802.11 standard series includes standards such as IEEE802.11a / b / g / n / ac / ax.
  • IEEE802.11ax uses OFDMA (Orthogonal Frequency Multiple Access) to provide a high peak throughput of up to 9.6 gigabits per second (GBps) and a technology that improves communication speed under congestion.
  • OFDMA Orthogonal Frequency Multiple Access
  • the AP transmits the Allocation information indicating the frequency resource assigned to each STA (station) to each STA.
  • the Allocation information can be included in a frame called a Trigger frame in the uplink, and can be included in the PHY (physical layer) header of the data frame in the downlink.
  • the present invention provides a technique that enables efficient use of a plurality of methods for allocating frequency resources.
  • the communication device has a communication means for transmitting or receiving a wireless frame conforming to the IEEE802.11 standard series to or from the other party device of communication, and the device that has transmitted the wireless frame is supported.
  • the ability information indicating the allocation method of the frequency resource being used is shown in the MAC (medium access control) frame of the radio frame.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication network.
  • FIG. 2 is a diagram showing an example of a hardware configuration of a communication device.
  • FIG. 3 is a diagram showing a functional configuration example of the communication device.
  • FIG. 4 is a diagram showing an example of the flow of processing of AP at the time of STA connection.
  • FIG. 5 is a diagram showing an example of an AP processing flow during downlink communication.
  • FIG. 6 is a diagram showing an example of an AP processing flow during uplink communication.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication network.
  • FIG. 2 is a diagram showing an example of a hardware configuration of a communication device.
  • FIG. 3 is a diagram showing a functional configuration example of the communication device.
  • FIG. 4 is a diagram showing an example of the flow of processing of AP at the time of STA connection.
  • FIG. 5 is a diagram showing an example of an AP processing flow during downlink communication.
  • FIG. 7 is a diagram showing an example of a communication flow of downlink communication when the SA method is used.
  • FIG. 8 is a diagram showing an example of a communication flow of uplink communication when the SA method is used.
  • FIG. 9 is a diagram showing an example of ability information regarding the Allocation method.
  • FIG. 10 is a diagram showing an example of information stored in the ability information.
  • FIG. 1 shows a configuration example of the wireless communication network of the present embodiment.
  • the wireless communication network includes one access point (AP) and three stations (STA).
  • AP102 and STA103 to STA105 are compliant with the IEEE802.11be standard, and are configured to be capable of executing wireless communication conforming to the standard established before the IEEE802.11be standard.
  • the access point may be referred to as "AP”
  • the station (terminal) may be referred to as "STA” without a reference number.
  • FIG. 1 shows a wireless communication network including one AP and three STAs as an example, but the number of these communication devices may be larger or smaller than shown in the figure.
  • the AP when communication between STAs is performed, the AP does not have to exist.
  • the communicable range of the network formed by the AP 102 is indicated by the circle 101.
  • the communicable range may cover a wider range or only a narrower range.
  • DA Dynamic Allocation
  • the overhead may increase when the Allocation information is notified every time the data frame is transmitted as in the DA method. That is, since the frequency resources to be used are specified for each of a large number of STAs, the length of the information indicating the allocation of the frequency resources becomes long. As a result, the time resources available for sending and receiving data frames are reduced, which can reduce throughput.
  • SA Static Allocation
  • the OFDMA Allocation information and the corresponding identifier are notified to the STA in advance before the data frame is transmitted, and only the identifier is specified when the data frame is transmitted.
  • the allocation of frequency resources cannot be changed dynamically, but the overhead of Allocation information can be reduced. It is assumed that the SA method and the DA method will be used properly according to the situation such as the number of STAs in the network.
  • the presence / absence of support of the SA method is notified in the MAC frame will be described, but the presence / absence of support for the allocation method of other radio resources (resources such as time, frequency, and space).
  • Information indicating that may be notified may be notified.
  • the case where the information is included in the MAC frame will be described, but the information may be notified by a PHY (physical layer) header or the like.
  • the AP specifies whether or not each STA supports the SA method and allocates the frequency resource
  • the STA may also have the same frequency resource allocation function. For example, the STA may determine whether another STA supports the SA method in inter-STA communication, and may decide whether to use the SA method or the DA method based on the determination result.
  • FIG. 2 shows a hardware configuration example of a communication device (AP and STA).
  • 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 an antenna 207 as an example of its hardware configuration.
  • the storage unit 201 is composed of ROM (read-only memory), RAM (random access memory), or one of them, and includes programs for performing various operations described later, communication parameters for wireless communication, and the like. Store various information.
  • ROM read-only memory
  • RAM 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, for example, one or more processors such as a CPU and an MPU, an ASIC (application specific integrated circuit), a DSP (digital signal processor), an FPGA (field programmable gate array), and the like.
  • processors such as a CPU and an MPU, an ASIC (application specific integrated circuit), a DSP (digital signal processor), an FPGA (field programmable gate array), and the like.
  • CPU is an acronym for Central Processing Unit
  • MPU is an acronym for Micro Processing Unit.
  • the control unit 202 controls the entire device by executing the program stored in the storage unit 201.
  • the control unit 202 may control the entire device in cooperation with the program stored in the storage unit 201 and the OS (Operating System).
  • 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 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 AP or STA via the communication unit 206 described later.
  • the 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 such as a display on the screen, an audio output by the speaker, and a vibration output. It should be noted that both the input unit 204 and the output unit 205 may be realized by one module like a touch panel.
  • the communication unit 206 controls wireless communication and IP communication in accordance with the IEEE802.11 standard series.
  • the communication unit 206 is a so-called wireless chip, and may itself include one or more processors and memories. In the present embodiment, the communication unit 206 can execute processing conforming to at least the IEEE802.11be standard. Further, the communication unit 206 controls the antenna 207 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 antenna 207 is, for example, an antenna capable of transmitting and receiving at least one of a sub GHz band, a 2.4 GHz band, a 5 GHz band, and a 6 GHz band.
  • the frequency band (and combinations thereof) that can be supported by the antenna 207 is not particularly limited.
  • the antenna 207 may be one antenna, or may be a set of two or more antennas for transmitting and receiving MIMO (Multi-Input and Multi-Output).
  • MIMO Multi-Input and Multi-Output
  • the antenna 207 may be configured to include 16 antenna elements to support MIMO communication in a 16-spatial stream of the IEEE802.11be standard.
  • FIG. 3 shows an example of the functional configuration of the communication device (AP and STA).
  • the communication device includes a capability information generation unit 301, a method determination unit 302, a connection processing unit 303, a MAC frame generation unit 304, and a data transmission / reception unit 305 as examples of its functional configuration.
  • the capability information generation unit 301 generates capability information including information of the Allocation method supported by the communication device. This capability information includes information indicating whether or not the DA method or SA method of the communication device can be used.
  • the method determination unit 302 determines the Allocation method used for OFDMA communication with the other party based on the information of the Allocation method supported by the communication partner device.
  • the connection processing unit 303 performs processing for the STA to connect to the network managed by the AP.
  • the connection processing unit 303 of the STA transmits an Association Request frame to the AP, and the connection processing unit 303 of the AP transmits an Association Response frame to the STA as a response.
  • the MAC frame generation unit 304 generates a MAC frame including the capability information of the Allocation method generated by the capability information generation unit 301 as needed. The details of the capability information of the Allocation method included in the MAC frame will be described later.
  • the MAC header portion includes the capability information of the Allocation method, but for example, the payload portion may include this capability information. After that, a PHY header is added to the generated MAC frame, and the wireless frame is generated.
  • the generated wireless frame is, for example, a frame such as Beacon, Probe Request / Response, Association Request / Response, and Response Request / Response.
  • the data transmission / reception unit 305 performs at least one of transmission and reception of a data frame by OFDMA communication according to the Allocation method determined by the method determination unit 302.
  • FIG. 4 shows an example of the processing flow executed by the AP before data communication is performed between the AP and the STA.
  • the AP acquires the capability information from the STA, determines whether to use the SA method or the DA method, and when using the SA method, the allocation information indicating the allocation of the frequency resource and the allocation information thereof. Notify the STA of the identification information of the allocation information.
  • the AP acquires the capability information of the Allocation method supported by one or more STAs that are communication partners from each of these STAs (S401).
  • the AP can acquire the capability information of the Allocation method for this STA by, for example, a probe request frame transmitted by the STA before connecting to the AP or an association request frame transmitted at the time of connection.
  • the AP determines the Allocation method to be used in communication with the STA based on the capability information of the Allocation method of the STA acquired in S401 (S402).
  • the AP decides to use the DA method, for example, when the STA can use only the DA method.
  • the AP may decide to use the SA method if the STA can only use the SA method. That is, the AP may decide to use a method that STA can use.
  • the AP determines that if there is a method in which the own device cannot be used, the method in which both the own device and the STA can be used is used. At this time, if there is no common method between the method that can be used by the own device and the method that can be used by the STA, the AP may not communicate with the STA. In this case, for example, the AP may not accept the Association Request or Response Request from the STA and may not establish the connection.
  • the AP is not the communication by OFDMA but the CSMA / CA method adopted in the standard before IEEE802.11be. Can be made to communicate.
  • the AP determines the Allocation method based on the information such as the communication characteristics of the application that uses the data transmitted and received to and from the STA. You may. For example, when the STA is a communication device that periodically transmits a fixed amount of data such as sensor data, it is assumed that the bandwidth and timing used will be fixed, so the AP selects the SA method. Can be done. Further, when the frequency band (bandwidth) used by the STA application fluctuates with time, the AP may select the DA method. Information on such characteristics can be notified from the STA to the AP by the management frame defined in the IEEE802.11 standard.
  • the AP may select the SA method to reduce the overhead of the Allocation information when the number of STAs of the communication partner with which the communication is performed in parallel becomes a predetermined number or more.
  • the AP may decide to use a different Allocation method for each STA. For example, for a large number of STAs that transmit sensor data, the SA method is used to make these STAs transmit data all at once, and for STAs such as smartphones that can execute various applications in parallel. , DA method may be used. Further, at a certain timing, the SA method may be used for some STAs and the DA method may be used for other STAs.
  • a predetermined frequency resource may be allocated to the STA using the SA method, and a frequency resource not allocated by the SA method may be assigned to the STA using the DA method.
  • a flexible Allocation method can be set for each STA.
  • the AP checks whether or not the Allocation method determined in S402 is the SA method (S403).
  • the AP transmits the management frame 1 including the Allocation information indicating the frequency resource allocation to the STA and the Allocation ID for identifying the Allocation information to the STA (S404). ..
  • the STA receives the management frame 1
  • the STA associates the Allocation information with the Allocation ID and stores it in the storage unit 201.
  • the AP method does not select the SA method (NO in S403), the AP ends the process of FIG. 4 without transmitting the management frame 1.
  • FIG. 5 shows an example of the AP processing flow during downlink (DL) -OFDMA communication.
  • the downlink is a wireless link in the direction in which the wireless frame is transmitted from the AP to the STA, and FIG. 5 shows a process when the data frame is transmitted from the AP to the STA.
  • the AP first checks whether the Allocation method to be used is the SA method (S501). When the AP does not use the SA method for the STA (NO in S501), that is, when the DA method is used, the PHY header of the data frame to the STA of the communication partner is the same as the IEEE802.11ax standard. Store in (S502). Then, the AP transmits the data frame to the STA (S504). In this case, the STA can identify the frequency resource assigned to the own device by checking the PHY header and receive the data frame with the frequency resource.
  • the AP stores the Allocation ID notified to the STA in S404 of FIG. 4 in the data frame addressed to the STA (S503). Then, the AP transmits the data frame to the STA (S504).
  • the Allocation ID may be stored in the PHY header or included in the MAC frame. In this case, since the STA stores the Allocation information and the Allocation ID in association with each other, the allocation of the frequency resource can be specified based on the Allocation information corresponding to the specified Allocation ID. Then, the STA can receive the data addressed to its own device in the allocated frequency resource.
  • FIG. 6 shows the flow of processing executed by the AP during uplink (UL) -OFDMA communication.
  • the uplink is a wireless link in the direction in which a wireless frame is transmitted from the STA to the AP
  • FIG. 6 shows a process when a data frame is transmitted from the STA to the AP.
  • the process of FIG. 6 can be performed in parallel for a plurality of STAs.
  • the process of FIG. 6 may be executed only once for the group.
  • frequency resources are allocated to a plurality of STAs according to the Allocation information transmitted by the management frame 1, and a common Allocation ID is notified to these STAs.
  • the management frame 2 described later including the Allocation ID is broadcasted to those STAs, so that a plurality of STAs can communicate in parallel with the transmission of one management frame as an opportunity. it can.
  • the AP first checks whether the Allocation method to be used is the SA method for the STA of the communication partner (S601). Then, when the SA method is not used for the STA (NO in S601), that is, when the DA method is used, the AP transmits a Trigger frame containing the Allocation information to the STA as in the IEEE802.11ax standard (NO). S602). Similar to the IEEE802.11ax standard, the STA identifies the allocated frequency resource according to the Allocation information of the Trigger frame, and transmits the radio frame using the frequency resource.
  • the AP transmits to the STA a management frame 2 that specifies the Allocation ID notified to the STA in S404 of FIG. 4 (S603).
  • the allocation of the frequency resource can be specified based on the Allocation information corresponding to the specified Allocation ID.
  • the STA then uses this allocated frequency resource to transmit the radio frame.
  • the AP waits for a radio frame to arrive at the frequency resource assigned to the STA, and receives the radio frame from the STA (S604).
  • a scan process is executed for the STA to acquire the network information of the AP (S701 to S703).
  • the AP sends out a Beacon frame containing network information, and the STA existing around the AP detects and receives the Beacon frame (S701).
  • the STA transmits a Probe Request frame inquiring about the network information of the AP (S702), and receives the response Probe Response frame from the AP (S703).
  • the STA may only passively acquire the network information of the AP by receiving the Beacon frame transmitted by the AP in S701, and may not execute the processes of S702 to S703. Further, the STA may acquire the network information of the AP by actively transmitting the Probe Request frame in S702 and receiving the Probe Response frame from the AP regardless of the Beacon frame.
  • the AP can include the ability information indicating the Allocation method supported by its own device in the Beacon frame and the Probe Response frame. In addition, the STA can include the ability information indicating the Allocation method supported by the own device in the Probe Request frame. Through these processes, the STA and the AP can exchange the capability information of the Allocation method with each other.
  • the STA transmits an Association Request frame for network connection (S704), and the AP transmits an Association Response frame indicating the connection result of the STA (S705).
  • the STA may include the capability information of the Allocation method of its own device in the Associate Request frame, and the AP may include the capability information of the Allocation method of its own device in the Associate Response frame.
  • the STA may determine the ability information of the Allocation method to be included in the Association Request frame based on the ability information of the Allocation method of the AP acquired in the scan process. For example, the STA provides capability information indicating that the own device can use only the DA method when the AP can use only the DA method even if the own device can use the SA method and the DA method. It may be included in the Association Request frame. Further, similarly, the AP may determine the ability information of the Allocation method to be included in the Association Response frame based on the ability information of the STA acquired by the scan process or the Association Request frame.
  • the AP decides to allocate the frequency resource by the SA method in the communication with the STA.
  • the AP transmits the management frame 1 including the Allocation information of DL-OFDMA and the Allocation ID for identifying the Allocation information to the STA (S706).
  • the STA stores this Allocation information in association with the Allocation ID.
  • the AP transmits the data frame (S707), the AP includes the Allocation ID corresponding to the frequency resource allocation at the time of the transmission in the PHY header of the data frame and transmits the data frame to the STA.
  • the processing of S801 to S805 is the same as that of S701 to S705 of FIG. 7, and thus the description thereof will be omitted.
  • the AP decides to allocate the frequency resource by the SA method in the communication with the STA.
  • the AP transmits the management frame 1 including the UL-OFDA Allocation information and the Allocation ID that identifies the Allocation information to the STA (S806).
  • the STA stores this Allocation information in association with the Allocation ID.
  • the AP transmits the management frame 2 including the Allocation ID to the STA in order to start the transmission of the UL-OFDMA data frame to the STA (S807).
  • the STA identifies the corresponding Allocation information by the Allocation ID, and transmits a data frame to the AP at the frequency resource specified based on the Allocation information (S808).
  • the DA method When the DA method is used for the uplink and the downlink, communication is performed by the method specified in IEEE802.11ax, but the description thereof is omitted here.
  • the same Allocation method may be used for the uplink and the downlink, or different Allocation methods may be used. For example, when the result of environment detection is periodically transmitted to the AP by a large number of sensors, it is assumed that the communication frequency of the uplink is high. On the other hand, it is assumed that the frequency of transmitting data to these sensors is low. Therefore, the SA method may be used for the uplink and the DA method may be used for the downlink.
  • the Allocation capacity element has the same configuration as other Information Elements defined in the 802.11 standard. That is, this capability information has a format that includes an Element ID field 901, a Length field 902, and an information field 903 specific to the capability information. This capability information is added to the MAC frame of the frame such as Beacon, Probe Request / Response, Assessment Request / Response, and Response Request / Response.
  • the Length field 902 stores a value indicating the total length of this ability information.
  • the information field 903 stores information on the Capability (Allocation Capability) indicating whether or not the Allocation method can be used.
  • An example of the information stored in the information field 903 is shown in FIG. FIG. 10 shows an example in which Allocation Capacity is indicated by 2-bit information.
  • the first bit (bit 0) indicates whether or not the DA method can be used.
  • a bit value of "0" indicates that the source device cannot use the DA method, and a bit value of "1" indicates that the device can use the DA method.
  • the second bit (bit 1) indicates whether or not the SA method can be used.
  • a bit value of "0” indicates that the source device cannot use the SA method, and a bit value of "1” indicates that the device can use the SA method.
  • a 2-bit field indicates whether or not two Allocation methods (DA method and SA method) can be used, but the present invention is not limited to this.
  • the number of bits in this field may be, for example, 3 bits or more, which may indicate availability for other Allocation methods.
  • the DA method and the SA method are only examples of the Allocation method, and other methods may be adopted instead of these.
  • the communication device notifies the other device of the information of the frequency resource allocation method supported (usable) by the own device by using the MAC frame structure. Can be done. This makes it possible to flexibly allocate frequency resources to be used for communication of each communication device based on the method supported by the communication device.
  • the example in which the capability information indicating the availability of the Allocation method is transmitted by the MAC frame has been described, but it may be included in other parts in the wireless frame such as the PHY preamble.
  • the present invention can also be carried out by an information processing device (for example, a wireless chip) that generates the above MAC frame.
  • 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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PCT/JP2020/042766 2019-11-18 2020-11-17 通信装置、情報処理装置、制御方法、及び、プログラム Ceased WO2021100695A1 (ja)

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