WO2023218918A1 - Dispositif et procédé de commande de communication sans fil, et programme - Google Patents

Dispositif et procédé de commande de communication sans fil, et programme Download PDF

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Publication number
WO2023218918A1
WO2023218918A1 PCT/JP2023/016041 JP2023016041W WO2023218918A1 WO 2023218918 A1 WO2023218918 A1 WO 2023218918A1 JP 2023016041 W JP2023016041 W JP 2023016041W WO 2023218918 A1 WO2023218918 A1 WO 2023218918A1
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WIPO (PCT)
Prior art keywords
link
information
frame
single radio
data
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PCT/JP2023/016041
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English (en)
Japanese (ja)
Inventor
茂 菅谷
悠介 田中
浩介 相尾
龍一 平田
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ソニーグループ株式会社
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Publication of WO2023218918A1 publication Critical patent/WO2023218918A1/fr

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    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0457—Variable allocation of band or rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • 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 technology relates to a wireless communication control device, method, and program, and particularly relates to a wireless communication control device, method, and program that can perform data transmission more reliably.
  • EMLSR is a method that simplifies the operation of Multi-Link Multi Radio, which operates independently on all pre-configured links (Pre-Configure Links).
  • EMLSR control frame exchange is performed using Multi Radio Link, and operations related to actual data transmission and reception are performed using Single Radio Link. Note that EMLSR is described in Patent Document 1.
  • EMLSR STA Once a communication terminal that supports EMLSR (EMLSR STA) has finished receiving data, it must wait for a control frame (Multi-STA RTS) sent from an access point (AP) etc. in all Pre-Configure Links. there were. The EMLSR STA then sends back a responsive control frame (CTS) on the link that received the Multi-STA RTS, identifies the next Single Radio to operate, and transitions to the identified Single Radio.
  • CTS responsive control frame
  • This technology was developed in view of this situation, and is intended to enable data transmission to be carried out more reliably.
  • a wireless communication control device performs control to receive first information from a wireless communication device via one of a plurality of links preset with the wireless communication device. and obtains first available link information indicating a link that can be used for communication to be performed after receiving the first information among the plurality of links included in an arbitrary frame, and
  • the apparatus includes a communication control unit that specifies a link for communication based on possible link information.
  • control is performed to receive the first information from the wireless communication device via one of a plurality of links preset between the wireless communication device and the wireless communication device.
  • First available link information indicating a link that can be used for communication performed after receiving the first information among the plurality of links included in the frame is acquired, and the first available link information Based on this, a link for communication is identified.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to a first embodiment of the present technology.
  • FIG. 3 is a diagram illustrating an example of the operation of each block of a device compatible with EMLSR.
  • FIG. 2 is a diagram showing an operation sequence of a conventional AP and EMLSR STA.
  • FIG. 3 is a diagram showing an operation sequence of the AP and EMLSR STA in the first embodiment of the present technology.
  • FIG. 2 is a block diagram showing a configuration example of a wireless communication device.
  • FIG. 6 is a block diagram showing a configuration example of the wireless communication module of FIG. 5.
  • FIG. 6 is a block diagram showing another configuration example of the wireless communication module of FIG. 5.
  • FIG. 2 is a diagram illustrating an example of the structure of a frame according to the first embodiment of the present technology. It is a figure which shows the 1st example of a structure of Single Radio Block ACK Frame. It is a figure which shows the 2nd example of a structure of Single Radio Block ACK Frame.
  • FIG. 3 is a diagram showing the structure of capability information including a link ID that needs to be exchanged when writing information in Bitmap format. It is a figure which shows the 3rd example of a structure of Single Radio Block ACK Frame. It is a flowchart explaining data transmission processing in a 1st embodiment. 14 is a flowchart following FIG. 13 illustrating data transmission processing. 3 is a flowchart illustrating data reception processing of EMLSR STA in the first embodiment.
  • FIG. 7 is a diagram showing another operation sequence of the data transmitting side communication device (AP) and EMLSR STA in the first embodiment of the present technology.
  • FIG. 7 is a diagram showing an operation sequence of a communication device (AP) on a data transmitting side and EMLSR STA in a second embodiment of the present technology.
  • FIG. 7 is a diagram illustrating an example configuration of a frame according to a second embodiment of the present technology.
  • FIG. 7 is a diagram showing a first configuration example of an A-MPDU frame according to a second embodiment of the present technology.
  • FIG. 7 is a diagram showing a second configuration example of an A-MPDU frame according to the second embodiment of the present technology.
  • FIG. 7 is a diagram showing a second configuration example of an A-MPDU frame according to the second embodiment of the present technology.
  • FIG. 3 is a diagram showing a first configuration example of an A-Control field of an arbitrary frame.
  • FIG. 7 is a diagram showing a second configuration example of an A-Control field of an arbitrary frame.
  • FIG. 3 is a diagram showing an example of the configuration of an aggregation frame. It is a flowchart explaining the data transmission process of the communication apparatus (AP) of the data transmission side in 2nd Embodiment of this technique. 26 is a flowchart following FIG. 25, illustrating data transmission processing of the communication device (AP) on the data transmission side. It is a flowchart explaining data reception processing of EMLSR STA in a second embodiment of the present technology. 28 is a flowchart following FIG. 27 illustrating data reception processing of EMLSR STA.
  • FIG. 27 illustrating data reception processing of EMLSR STA.
  • FIG. 7 is a diagram showing an operation sequence of an AP and EMLSR STA in a third embodiment of the present technology. It is a figure which shows the 4th example of a structure of Single Radio Block ACK Frame. It is a flowchart explaining the data reception process of EMLSR STA in a 3rd embodiment of this technology. 32 is a flowchart following FIG. 31 and illustrating data reception processing of EMLSR STA.
  • FIG. 7 is a diagram showing an operation sequence of EMLSR STA in a fourth embodiment of the present technology. It is a figure showing the operation sequence of AP in a 4th embodiment of this technology. It is a figure which shows the example of a structure of Quick Reserve Single Radio Control Frame.
  • FIG. 43 is a flowchart following FIG. 42 and explaining data reception processing of EMLSR STA.
  • 43 is a flowchart following FIG. 42 and explaining data reception processing of EMLSR STA.
  • 1 is a block diagram showing an example of the configuration of a computer.
  • FIG. FIG. 1 is a block diagram illustrating a schematic configuration example of a smartphone to which the present technology is applied.
  • FIG. 1 is a block diagram showing a schematic configuration example of an in-vehicle device to which the present technology is applied.
  • FIG. 2 is a block diagram showing a schematic configuration example of a wireless AP to which the present technology is applied.
  • First embodiment (Available Single Radio Link information) 2.
  • Second embodiment (Next Single Radio Link information) 3.
  • Third embodiment (combination of first embodiment and second embodiment) 4.
  • Fourth embodiment (Quick Reserve Single Radio Control Frame) 5. others
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to a first embodiment of the present technology.
  • the wireless communication system in Figure 1 consists of an AP, EMLSR STA, and hidden terminal (Hidden STA) that form one wireless LAN (Local Area Network) network as a Basic Service Set (BSS).
  • AP Access to Mobile
  • EMLSR STA EMLSR STA
  • Hidden STA hidden terminal
  • BSS Basic Service Set
  • the AP, EMLSR STA, and Hidden STA are in a state where they can communicate with communication devices existing within the radio wave range.
  • the radio coverage area is indicated by a dashed ellipse centered on the marks representing AP, EMLSR STA, and Hidden STA.
  • An AP is a device that operates as an access point.
  • EMLSR STA is a device that operates as a terminal that supports EMLSR.
  • the AP and EMLSR STA perform data transmission as indicated by the white arrows.
  • Hidden STA is a device that operates as a terminal and is located in a hidden position from EMLSR STA.
  • the Hidden STA performs data transmission with the AP as indicated by the black arrow.
  • OBSS STA which are STAs forming another communication network (O(Overlap)BSS).
  • OBSS STA is a device that operates as a terminal and can communicate with communication devices (EMLSR STA in the case of FIG. 1) that exist within the radio range indicated by the dashed-dotted ellipse.
  • EMLSR STA detects a signal from OBSS STA, it will not be able to correctly detect control frames such as RTS from AP.
  • FIG. 2 is a diagram showing an example of the operation of each block of a device compatible with EMLSR.
  • blocks that operate when exchanging control frames such as MU RTS and CTS shown on the right side are shown with solid lines. Note that in FIG. 2, blocks that do not operate are indicated by broken lines.
  • Control frame exchange is performed by multiple radios.
  • Multi Radio for example, when operating using the 5GHz band and 6GHz band, there is a radio frequency processing unit (RF) that operates using the 5GHz band link (Radio), and a block that can process control frames for the RF (Small). is configured. Similarly, an RF that operates using a 6GHz band link (Radio) and a Small that can process control frames for the RF are configured. Therefore, multiple Radios are ready to receive control frames.
  • RF radio frequency processing unit
  • the two RFs When transmitting and receiving data frames, only operation using Single Radio, for example, 6GHz band Radio, is possible.
  • the two RFs When operating using a 6GHz radio, the two RFs operate on a 6GHz radio, and data transmission and reception via the two RFs is performed by the physical layer block (PHY) and media control block (MAC). will be carried out.
  • PHY physical layer block
  • MAC media control block
  • FIG. 2 a simple block configuration is shown to explain the minimum EMLSR operation, and the block configuration of the wireless communication device according to the present technology is not limited to this block configuration.
  • FIG. 3 is a diagram showing the operation sequence of the conventional AP and EMLSR STA.
  • EMLSR STA operates using Multi Radio
  • an AP or communication device (AP in the figure) that operates Multi-Link Multi-Radio and EMLSR STA that operates Multi-Link Single Radio exchange predetermined data and It is assumed that the device is expected to operate using the pre-configured links (Radio 1 to Radio 3) that have been set.
  • solid arrows represent signal transmission
  • rectangles on the horizontal axis represent signals being transmitted (TX)
  • rectangles below the horizontal axis represent signals being received (RX). represent.
  • the AP transmits a Multi-User RTS frame (hereinafter referred to as an RTS frame (R in the figure)) as a control frame, for example, using Radio1, and initiates data transmission to the EMLSR STA. to notify.
  • RTS frame R in the figure
  • the AP transmits a Multi-User RTS frame (hereinafter referred to as an RTS frame (R in the figure)) as a control frame, for example, using Radio1, and initiates data transmission to the EMLSR STA. to notify.
  • EMLSR STA receives RTS frames.
  • EMLSR STA when responding to the RTS frame, EMLSR STA returns a CTS frame (C in the figure) to the AP.
  • the AP receives the CTS frame.
  • the AP starts transmitting data (DATA in the figure).
  • EMLSR STA starts receiving data.
  • the EMLSR STA After the data transmission is completed, at timing t4, the EMLSR STA transmits an ACK Frame (A in the figure), which is a response frame confirming receipt of the data, as necessary.
  • the AP receives the ACK Frame. This ends data transmission on Radio1.
  • the communication device can only occupy each radio for a predetermined period of time, the same radio cannot be used for a period based on the predetermined backoff. Therefore, if data transmission is not completed within a predetermined time or if undelivered data exists, the communication device needs to continue data transmission.
  • the AP transmits an RTS frame using, for example, Radio2.
  • EMLSR STA is in a BUSY state because signals are being transmitted from other communication devices using Radio 2, and it is subject to signal interference and cannot receive RTS frames correctly.
  • the CTS frame in response to this RTS is not sent back from the EMLSR STA to the AP. Since the CTS frame from the STA does not arrive, the AP selects another link from among the Pre-Configure links and retransmits the RTS frame.
  • the AP transmits an RTS frame to the EMLSR STA using Radio3.
  • the EMLSR STA If the RTS frame is correctly received using Radio3, the EMLSR STA returns the CTS frame to the AP at timing t7.
  • the AP can perform data transmission at timing t8 by receiving the CTS frame transmitted from the STA using Radio3.
  • EMLSR STA also receives data using Radio3.
  • EMLSR STA After the end of data transmission, at timing t9, EMLSR STA transmits an ACK Frame as necessary. The AP receives the ACK Frame. This ends data transmission using Radio3.
  • the AP sends the RTS frame to EMLSR STA using Radio2, which is an available link. Send.
  • EMLSR STA is in a BUSY state due to signals from other communication devices and cannot correctly decode the RTS frame using Radio2, so EMLSR STA is unable to return the CTS frame.
  • the AP Since there is no CTS frame returned from EMLSR STA, the AP transmits an RTS frame using Radio1 at timing t11 in order to use another Pre-Configure Link (Radio1).
  • the EMLSR STA If the RTS frame is successfully received using Radio1, the EMLSR STA returns the CTS frame to the AP at timing t12.
  • the AP By detecting the CTS frame from the STA using Radio1, the AP can transmit data using Radio1 at timing t13, and the EMLSR STA can also receive data using Radio1.
  • FIG. 4 is a diagram showing an operation sequence of an AP or a communication device on the data transmitting side (referred to as AP in the figure) and EMLSR STA in the first embodiment of the present technology.
  • Timings t11 to 13 in FIG. 4 are the same processes as timings t1 to t3 in FIG. 3, so a description thereof will be omitted.
  • EMLSR STA detects the usage status of Pre-Configure Link, and information about available links among Pre-Configure Links (Available Single Radio Link information) is included in the ACK Frame (S in the figure) and sent to the AP.
  • the ACK frame that includes the Available Single Radio Link information is hereinafter referred to as the Single Radio Block ACK Frame.
  • EMLSR STA refrains from using Radio3, which is receiving interference from other OBSS STAs due to the presence of a certain noise level, and makes sure that the noise level is low.
  • Radio2 whose level is below a predetermined level is determined to be usable.
  • the EMLSR STA can notify the AP of available link information by sending a Single Radio Block ACK Frame containing the Available Single Radio Link information to the AP.
  • the AP can understand that the EMLSR STA is currently in a state where Radio2 is available.
  • the AP itself is capable of using Radio2 and has data to be transmitted addressed to EMLSR STA, it can perform data transmission to EMLSR STA again using Radio2.
  • EMLSR STA determines that it is difficult to use Radio3 at the next transmission timing (timing t17) and that Radio1 can be used, and selects Available Single. Include Radio Link information in a Single Radio Block ACK Frame and send it to the AP.
  • the AP receives the Single Radio Block ACK Frame that includes the Available Single Radio Link information and understands that the EMLSR STA is ready to use Radio1.
  • the AP At timing t17, if the AP is also able to use Radio1 and has transmission data addressed to EMLSR STA, it will transmit data to EMLSR STA again using Radio1.
  • EMLSR STA determines that it is difficult to use Radio2 at the next transmission timing (timing t19) and that it is possible to use Radio3. Include Radio Link information in a Single Radio Block ACK Frame and send it to the AP.
  • the AP receives the Single Radio Block ACK Frame that includes the Available Single Radio Link information and understands that the EMLSR STA is ready to use Radio3.
  • the AP itself is capable of using Radio3 and has data to be sent addressed to EMLSR STA, it transmits data to EMLSR STA again using Radio3.
  • the data receiving device since the data receiving device sends a frame containing the Available Single Radio Link information based on the latest Pre-Configure Link usage status, the data receiving device can It is possible to specify a link that waits for data transmission to be performed, and redundant information exchange can be reduced.
  • to perform next means to perform after the transmission of the Available Single Radio Link information, and the timing may be immediately after the transmission of the Available Single Radio Link information, or the timing may be immediately after the transmission of the Available Single Radio Link information. It doesn't have to be immediately after, as long as it is after.
  • Block ACK frame which is one of the control frames
  • Available Single Radio Link information which is information on available links among the Pre-Configure Links
  • the frames used are not limited to control frames, but may be data frames or other frames.
  • the EMLSR STA may construct a new frame, include Available Single Radio Link information in the constructed frame, and transmit it immediately before or after the Block ACK Frame return timing.
  • information indicating the link with the lowest interference noise level selected from the pre-configured links is expressed in approximately 4 bits.
  • the Available Single Radio Link information includes information in bitmap format that indicates a link whose interference noise level is below a predetermined threshold, which has been determined to be available from pre-configured links. It may be possible to do so.
  • FIG. 5 is a block diagram illustrating a configuration example of a wireless communication device according to the present technology.
  • the wireless communication device 1 in FIG. 5 is a wireless communication device that operates as an AP or STA.
  • the wireless communication device 1 includes an Internet connection module 11, an information input module 12, a device control module 13, an information output module 14, and a wireless communication module 15.
  • wireless communication device may be configured with only necessary modules.
  • the Internet connection module 11 When the Internet connection module 11 operates as an AP under the control of the device control module 13, it is configured to implement functions such as a communication modem for connecting to the Internet network.
  • the Internet connection module 11 establishes a connection to the Internet via a public communication line and an Internet service provider.
  • the information input module 12 outputs information conveying instructions input by the user to the device control module 13.
  • the information input module 12 includes push buttons, a keyboard, a touch panel, and the like.
  • the device control module 13 is composed of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like.
  • the device control module 13 executes a program stored in a ROM or the like, causes an application to function in an upper layer, and performs control to operate as an AP or STA.
  • the information output module 14 outputs information regarding the operating state of the wireless communication device 1 supplied from the device control module 13 or information obtained via the Internet.
  • the information output module 14 includes a display element such as an LED (Light Emitting Diode), a liquid crystal panel, or an organic display, or a speaker that outputs audio or music.
  • the information output module 14 displays or notifies the user of necessary information.
  • the wireless communication module 15 transmits data supplied from the device control module 13 to other wireless communication devices 1 by performing wireless communication.
  • the wireless communication module 15 receives data transmitted from other wireless communication devices 1 by performing wireless communication, and outputs the received data to the device control module 13.
  • FIG. 6 is a block diagram showing a configuration example of the wireless communication module 15 when operating as an AP.
  • the configuration of the wireless communication module 15 in FIG. 6 is, for example, the configuration of an AP in a network where an EMLSR STA exists, or the configuration of an STA of a multilink device that supports EMLMR (Extended Multi-Link Multi Radio).
  • the wireless communication module 15 includes a Data Buffer 21, a data construction section 22, a Multi-Link control section 23, a Multi-Link MAC processing section 24-1 and 24-2, a Multi-Link PHY processing section 25-1 and 25-2, and a Multi-Link PHY processing section 25-1 and 25-2.
  • the number of each of these blocks corresponds to the number of radios that can be configured with multilinks, but in order to simplify the explanation, they will be described here as a minimum of two blocks.
  • the wireless communication module 15 also includes Multi-Link RF detection units 27-1 and 27-2, Multi-Link PHY reception units 28-1 and 28-2, Multi-Link MAC determination units 29-1 and 29-2, It is configured to include a data processing section 30 and a Pre-Configure Link determination section 31.
  • the Data Buffer 21 receives transmission data from the device control module 13 and temporarily stores it.
  • the data construction unit 22 constructs data to be processed during data transmission. That is, the wireless communication module 15 in FIG. 6 is configured to be able to operate in a multi-link manner by having the data construction unit 22 deliver data to be transmitted to each radio data transmission block.
  • the Multi-Link control unit 23 performs communication control using each Radio during data transmission by the multi-link compatible wireless communication module 15.
  • the Multi-Link MAC processing unit 24-1, the Multi-Link PHY processing unit 25-1, and the Multi-Link RF signal processing unit 26-1 are configured as a first data transmission block that processes using Radio1.
  • the Multi-Link MAC processing unit 24-2, the Multi-Link PHY processing unit 25-2, and the Multi-Link RF signal processing unit 26-2 are configured as a second data transmission block that processes using Radio2.
  • Multi-Link MAC processing units 24-1 and 24-2 Multi-Link PHY processing units 25-1 and 25-2, and Multi-Link RF signal processing units 26-1 and 26-2. If there is no Multi-Link MAC processing unit 24, Multi-Link PHY processing unit 25, Multi-Link RF signal processing unit 26.
  • the Multi-Link MAC processing unit 24 implements access control of data to be transmitted.
  • the Multi-Link PHY processing unit 25 converts the transmission data into a baseband signal.
  • the Multi-Link RF signal processing unit 26 performs high-frequency processing on the baseband signal converted by the Multi-Link PHY processing unit 25 and transmits it from the antenna.
  • the Multi-Link RF detection unit 27-1, the Multi-Link PHY reception unit 28-1, and the Multi-Link MAC determination unit 29-1 are configured as a first data reception block processed by Radio1.
  • the Multi-Link RF detection unit 27-2, the Multi-Link PHY reception unit 28-2, and the Multi-Link MAC determination unit 29-2 are configured as a second data reception block processed by Radio2.
  • Multi-Link RF detection sections 27-1 and 27-2 the Multi-Link PHY reception sections 28-1 and 28-2, and the Multi-Link MAC judgment sections 29-1 and 29-2. If not, they are referred to as the Multi-Link RF detection unit 27, Multi-Link PHY reception unit 28, and Multi-Link MAC determination unit 29.
  • the Multi-Link RF detection unit 27 detects the waveform of the received data portion from the signal received by the antenna.
  • the Multi-Link PHY receiver 28 extracts a baseband signal from the waveform detected by the Multi-Link RF detector 27.
  • the Multi-Link MAC determination unit 29 detects a predetermined frame in the channel from the baseband signal extracted by the Multi-Link PHY reception unit 28 and performs access control.
  • the data processing unit 30 centrally processes the data received by the data reception block of each Radio.
  • the Pre-Configure Link determination unit 31 controls the settings of the Radio used for communication when communicating with the EMLSR STA.
  • the Pre-Configure Link determination unit 31 determines whether or not the link can be used by collecting, for example, received field strength information and noise level values of individual links in each Radio link.
  • the Pre-Configure Link determination unit 31 outputs the determination result of whether the link can be used to the Multi-Link control unit 23.
  • the process of receiving the Single Radio Block ACK Frame is performed by the first data reception block, for example, when the Single Radio Block ACK Frame is received on the Radio1 link. .
  • the signal waveform is detected by the Multi-Link RF detection unit 27-1, and the baseband signal is extracted from the detected waveform by the Multi-Link PHY reception unit 28-1.
  • the frame is detected by the Multi-Link MAC determination unit 29-1.
  • the Multi-Link control unit 23 recognizes that the Single Radio Block ACK Frame has been received as one of the control frames.
  • the Multi-Link control unit 23 is notified of this via the Pre-Configure Link determination unit 31.
  • a link (Radio) that can be used by EMLSR STA is specified, and communication on that link (Radio) is controlled.
  • FIG. 7 is a block diagram showing another configuration example of the wireless communication module 15.
  • the wireless communication module 15 in FIG. 7 is, for example, a wireless communication module of the wireless communication device 1 that supports EMLSR.
  • the wireless communication module 15 includes a Data Buffer 51, a Single Radio data processing unit 52, a Single Radio MAC processing unit 53, a Single Radio PHY transmission unit 54, a Single Radio RF signal processing unit 55, a Single Radio control unit 56, a Single Radio MAC determination unit 57 , a Single Radio PHY receiving section 58, and a Single Radio RF detecting section 59.
  • the wireless communication module 15 is configured to include Radio RF detection units 60-1 and 60-2, Radio PHY reception units 61-1 and 61-2, and Radio MAC determination units 62-1 and 62-2. .
  • each block is configured in a number corresponding to the number of radios that can be configured by multi-link, but in order to simplify the explanation, it will be described here as a minimum of two blocks.
  • the wireless communication module 15 is configured to include a control information processing section 63 and a Pre-Configure Link determination section 64.
  • the Data Buffer 51 receives data to be transmitted from the device control module 13 and temporarily stores it.
  • the Single Radio data processing unit 52 processes data during data transmission.
  • the Single Radio MAC processing section 53, the Single Radio PHY transmission section 54, and the Single Radio RF signal processing section 55 are configured as a data transmission block.
  • the Single Radio MAC processing unit 53 implements access control of data to be transmitted.
  • the Single Radio PHY transmitter 54 converts the transmission data into a baseband signal.
  • the Single Radio RF signal processing section 55 performs high frequency processing on the baseband signal converted by the Single Radio PHY transmission section 54 and transmits it from the antenna.
  • the Single Radio control unit 56 performs communication control using each radio during data transmission in the wireless communication module 15.
  • the Single Radio MAC determination unit 57, Single Radio PHY reception unit 58, and Single Radio RF detection unit 59 are configured as a data reception block.
  • the Single Radio MAC determining unit 57 detects a predetermined frame in the channel of the baseband signal extracted by the Single Radio PHY receiving unit 58 and performs access control.
  • the Single Radio PHY receiver 58 extracts a baseband signal from the waveform detected by the Single Radio RF detector 59.
  • the Single Radio RF detection unit 59 detects the waveform of the received data portion from the signal received by the antenna.
  • the Radio RF detection unit 60-1, Radio PHY reception unit 61-1, and Radio MAC determination unit 62-1 are configured as a first control information reception block that processes control information such as an RTS frame with Radio1.
  • the Radio RF detection unit 60-2, the Radio PHY reception unit 61-2, and the Radio MAC determination unit 62-2 are configured as a second control information reception block that processes control information with Radio2.
  • Radio RF detection units 60-1 and 60-2 the Radio PHY reception units 61-1 and 61-2, and the Radio MAC determination units 62-1 and 62-2, the Radio RF detection unit 60, Radio PHY receiving section 61, and Radio MAC determining section 62.
  • the Radio RF detection unit 60 detects the waveform of the RF signal.
  • the Radio PHY receiving unit 61 extracts a baseband signal from the detected waveform.
  • the Radio MAC determining unit 62 detects a predetermined control frame from the extracted baseband signal and performs access control.
  • the control information processing unit 63 collects control information of control frames detected in a plurality of radios, and sequentially determines in which radio link, for example, a control frame addressed to itself has been received.
  • the control information processing section 63 outputs the control information of the control frame addressed to itself to the Pre-Configure Link determination section 64 .
  • the Pre-Configure Link determination unit 64 determines whether or not the link can be used by collecting, for example, received field strength information and noise level values of individual links in each Radio link. The Pre-Configure Link determination unit 64 outputs the determination result as to whether the link can be used to the Single Radio control unit 56.
  • the process of transmitting the Single Radio Block ACK Frame is executed by the data transmission block under the control of the Single Radio control unit 56.
  • the transmission data is constructed as a Control Frame by the Single Radio MAC processing unit 53, converted to a baseband signal by the Single Radio PHY transmission unit 54, subjected to high frequency processing by the Single Radio RF signal processing unit 55, and transmitted from the antenna. .
  • the process of receiving the A-MPDU frame is executed by the data reception block under the control of the Single Radio control unit 56.
  • the waveform of the received data part of the signal received by the antenna is detected by the Single Radio RF signal detection unit 69, and the baseband signal extracted from the detected waveform is detected as a predetermined A-MPDU frame in the Single Radio channel.
  • the reception process is executed by the Single Radio PHY reception unit 68. Thereafter, the Single Radio MAC determination unit 67 analyzes the delimiter information and separates the MPDU portion.
  • the link consists of two blocks, Radio1 and Radio2, but in reality, it corresponds to the number of links that can be processed simultaneously in EMLSR.
  • a number of Radio blocks are prepared.
  • FIG. 8 is a diagram illustrating a frame configuration example according to the first embodiment of the present technology.
  • the frame in FIG. 8 is a frame configured as an action frame or a management frame indicating that it corresponds to a sequence for notifying information on available links.
  • the frame in FIG. 8 is defined as an EML Operation Mode Notification Frame. Further, the frame shown in FIG. 8 is transmitted as appropriate when the EMLSR STA performs an association operation with the AP.
  • the EML Operation Mode Notification Frame is configured to include Category, EHT Action, Dialog Token, and EML Control Field.
  • EML Control Field includes EMLSR Mode bit (0th bit), EMLMR Mode bit (1st bit), EMLSR Link Bitmap bit (2nd bit to 17th bit), Reserved bit (18th bit to 22nd bit), Single Configured to include Radio BA bit (23rd bit).
  • the Single Radio BA bit is a bit that indicates whether information on available links can be notified using this technology.
  • the configuration of the frame that includes the Single Radio BA bit is not limited to the frame configuration in FIG. 8.
  • the Single Radio BA bit may be set in frames other than action frames or management frames as necessary.
  • FIG. 9 is a diagram showing a first configuration example of the Single Radio Block ACK Frame.
  • the Single Radio Block ACK Frame in FIG. 9 is configured to include the following fields: Frame Control, Duration, RA (Recierved Address), TA (Transport Address), BA Control, BA Information, and FCS (File Check Sequence).
  • Frame Control is information indicating the type and format of the frame.
  • Duration is information indicating the duration of the frame.
  • RA is identification information that identifies the receiving device.
  • TA is identification information that identifies the sending device.
  • BA Control Field consists of BA ACK Policy bit (0th bit), BA Type bit (1st bit to 4th bit), Available Single Link bit (5th bit to 8th bit), Reserved bit (9th bit to 8th bit). 11 bits) and TID_INFO bits (12th to 15th bits).
  • the Available Single Link bit included in the BA Control Field is Available Single Radio Link information indicating available links.
  • BA Information is information about BA.
  • FCS is a frame check sequence for error detection.
  • the Single Radio Block ACK Frame in Figure 9 maintains the conventional Block ACK Frame format and uses the 5th to 8th bits, which were reserved bits in the BA Control field, as the Available Single Link bits. It is configured so that one possible link can be specified. Reserved bits are bits that are not defined as bits representing specific information in the 802.11 standard.
  • the 5th to 8th bits which were reserved bits of the BA Control Field, are used as the Available Single Link bits, but other reserved bits may be used.
  • FIG. 10 is a diagram showing a second frame configuration example of the Single Radio Block ACK Frame.
  • the Single Radio Block ACK Frame in Figure 10 differs from the Single Radio Block ACK Frame in Figure 9 in the configuration of the BA Control Field.
  • BA Control Field includes BA ACK Policy bit (0th bit), BA Type bit (1st bit to 4th bit), Available Single Link Bitmap bit (5th bit to 11th bit), TID_INFO bit ( 12th bit to 15th bit).
  • the Available Single Link Bitmap bit included in the BA Control Field is information indicating available links.
  • the Single Radio Block ACK Frame in Figure 10 retains the conventional Block ACK Frame format, but uses the 5th to 11th bits, which were reserved bits in the BA Control field, to exclude the current link. , is configured so that all available links can be specified in Bitmap format.
  • FIG. 11 is a diagram showing the configuration of capability information including a link identifier (Link ID) that needs to be exchanged when information in Bitmap format is described as an available link.
  • Link ID link identifier
  • the capability information is configured to include Frame Control, Duration, ..., multiple elements, Request Element, and Probe Multi-Link element.
  • the Probe Multi-Link element is configured to include Element ID, Lgngth, Element ID Extension, Multi-Link Control, and multiple Pre-STA Profiles.
  • Each Pre-STA Profile is configured to include Subelemnt ID, Length, and Data.
  • Data includes STA Control. Note that Data may include a Request element.
  • STA Control is configured to include Link ID, which is a link identifier, Complete Profile, which is link attribute information, and so on.
  • information such as frequency channel information for operating using multi-links is written as attribute information (Complete Profile) of each link for each link ID. .
  • each bit can be assigned and described based on the link identifier (Link ID).
  • the first bit is assigned from the smallest numerical value of the link identifier (Link ID), and the last bit is assigned from the highest numerical value of the link identifier (Link ID).
  • the necessary bit size may be set for the link identifier (Link ID) according to the number of multi-links supported by the own communication device.
  • Link ID link identifier
  • the determination as to whether one link is in use may be made based on attribute information of the link.
  • FIG. 12 is a diagram showing a third frame configuration example of the Single Radio Block ACK Frame.
  • the Single Radio Block ACK Frame in Figure 12 differs from the Single Radio Block ACK Frame in Figure 9 in that a new field, EML Control Field, is added.
  • the EML Control Field is an area that is transmitted after the existing area of the 802.11be standard (BA information in the case of FIG. 12).
  • the EML Control Field includes information indicating available links and information indicating whether operation is possible in EMLSR mode.
  • the Single Radio Block ACK Frame in Figure 12 can include information indicating available links and information indicating whether operation is possible in EMLSR mode. It is composed of
  • ⁇ AP processing in the first embodiment> 13 and 14 are flowcharts illustrating data transmission processing in the first embodiment.
  • FIGS. 13 and 14 the operation will be explained as the operation in the AP to which EMLSR STA connects, but the data transmission process in FIGS. It can also be applied when STA) makes a decision and sends data.
  • a link that has been set in advance as a Pre-Configure Link is specified, for example, by exchanging a predetermined action frame with EMLSR STA.
  • step S11 the data construction unit 22 (FIG. 6) receives transmission data addressed to the EMLSR STA from the device control module 13 via the Data Buffer 21.
  • step S12 the Multi-Link control unit 23 performs detection settings to understand the usage status of Pre-Configure Link of EMLSR STA.
  • step S13 the Multi-Link control unit 23 calculates the number of MPDUs to be aggregated (number of A-MPDUs) based on the acquisition status of transmission opportunities in Single Radio that transmits data and the time that can be transmitted in one access control. get.
  • step S14 the data construction unit 22 acquires the subframe of the MPDU.
  • step S15 the data construction unit 22 constructs an A-MPDU frame.
  • step S16 the data construction unit 22 determines whether it is the end of the A-MPDU (frame) based on the acquired number of A-MPDUs. If it is determined in step S16 that it is not the end of the A-MPDU, the process returns to step S14 and the subsequent processes are repeated.
  • step S16 If it is determined in step S16 that it is the end of the A-MPDU, the process proceeds to step S17.
  • the Multi-Link control unit 23 collects A-MPDUs into an A-MPDU Frame until a predetermined number of A-MPDUs are reached, and controls and transmits the first data transmission block or the second data transmission block.
  • the Multi-Link control unit 23 determines whether or not an ACK frame is returned. If it is determined that no ACK frame is returned, the data transmission process of the AP ends.
  • step S17 If it is determined in step S17 that an ACK frame has been returned, the process proceeds to step S18 in FIG. 14.
  • step S18 the Multi-Link control unit 23 waits for a Block ACK frame.
  • step S19 the Multi-Link control unit 23 determines whether a Block ACK frame has been received. If it is determined in step S19 that a Block ACK frame has not been received, the process returns to step S18 and the subsequent processes are repeated.
  • step S19 If the Block ACK frame is received in the first data reception block or the second data reception block, it is determined in step S19 that the Block ACK frame has been received, and the process proceeds to step S20.
  • step S20 the Multi-Link control unit 23 acquires Block ACK information from the Block ACK frame received in the first data reception block or the second data reception block.
  • step S21 the Multi-Link control unit 23 determines whether the acquired Block ACK information includes Available Single Radio Link (ASRL) information indicating an available link. If it is determined in step S21 that the Available Single Radio Link information is written, the process proceeds to step S22.
  • ASRL Available Single Radio Link
  • step S22 the Pre-Configure Link determination unit 31 obtains the detection status of its own Pre-Configure Link from the Available Single Radio Link information.
  • step S23 the Multi-Link control unit 23 determines whether the Available Single Radio Link described in the Available Single Radio Link information can be used, based on the detection status of the Pre-Configure Link. If it is determined in step S23 that the link can be used, the process proceeds to step S24.
  • step S24 the Multi-Link control unit 23 transitions to the Available Single Radio Link described in the Available Single Radio Link information and continues data transmission.
  • transitioning to a specified Radio has the same meaning as setting the specified Radio as a link to perform an operation.
  • step S21 if it is determined that the Available Single Radio Link information is not described, the processes of steps S22 to S24 are skipped and the process advances to step S25.
  • step S23 If it is determined in step S23 that the Available Single Radio Link described in the Available Single Radio Link information is not available, the process in step S24 is skipped and the process proceeds to step S25.
  • step S25 the Multi-Link control unit 23 determines whether there is any undelivered data based on the Block ACK information acquired in step S20. If it is determined in step S25 that there is unreached data, the process proceeds to step S26.
  • step S26 the Multi-Link control unit 23 identifies undelivered MPDUs. Thereafter, the process returns to step S12 in FIG. 13, and the subsequent processes are repeated.
  • step S25 If it is determined in step S25 that there is no undelivered data, the data transmission process of the AP in FIGS. 13 and 14 ends.
  • ⁇ EMLSR STA processing> 15 and 16 are flowcharts illustrating data reception processing of the EMLSR STA in the first embodiment.
  • FIGS. 15 and 16 the operation will be explained as the operation in EMLSR STA, but it can also be used when the AP or the communication device (STA) on the data sending side determines the available links and notifies the information of the available links. , the processes of FIGS. 15 and 16 can be applied.
  • step S41 the Single Radio control unit 56 (FIG. 7) of the EMLSR STA operates the link defined as the Pre-Configure Link by exchanging a predetermined action frame with the AP, etc., and configures the Single Radio. Set reception operation.
  • step S42 the Single Radio data processing unit 52 determines whether or not an A-MDPU has been received. If it is determined in step S42 that the A-MDPU has not been received, the process returns to step S41 and the subsequent processes are repeated.
  • step S42 if it is determined that A-MDPU has been received, the process advances to step S43.
  • step S43 the Single Radio data processing unit 52 determines whether or not each MDPU has been successfully received. If it is determined in step S43 that each MDPU has been successfully received, the process proceeds to step S44.
  • step S44 the Single Radio data processing unit 52 stores the normally received MDPU in the Data Buffer 51.
  • step S45 the Single Radio data processing unit 52 stores the ACK sequence number of the normally received MDPU.
  • step S46 the Single Radio data processing unit 52 determines whether the end of the MPDU has arrived. If it is determined in step S46 that the end of the MPDU has not arrived, the process returns to step S43 and the subsequent processes are repeated.
  • step S46 If it is determined in step S46 that the end of the MPDU has arrived, the process proceeds to step S47.
  • step S47 the Single Radio data processing unit 52 acquires the stored ACK sequence number and constructs a Block ACK frame. The process then proceeds to step S48.
  • step S43 If it is determined in step S43 that the individual MDPUs have not been received normally, the processes in steps S44 to S47 are skipped and the process proceeds to step S48.
  • step S48 the Single Radio control unit 56 determines whether it is necessary to add available link information. If it is determined in step S48 that it is necessary to add available link information, the process proceeds to step S49 in FIG. 16.
  • step S49 the Pre-Configure Link determination unit 64 obtains the status of available Links based on the current received field strength, noise level, etc. of the Pre-Configure Links.
  • step S50 the Pre-Configure Link determination unit 64 determines whether there is a candidate link. If it is determined in step S50 that there is a candidate link, the process proceeds to step S51.
  • step S51 the Pre-Configure Link determination unit 64 determines whether there are multiple candidate links. If it is determined in step S51 that there are multiple candidate links, the process proceeds to step S52.
  • step S52 the Single Radio control unit 56 determines whether to notify information regarding the plurality of candidate links in Bitmap format (Bitmap format). If it is determined in step S52 that the information regarding the links of the plurality of candidates is not notified in the Bitmap, the process proceeds to step S53.
  • Bitmap format Bitmap format
  • step S53 the Pre-Configure Link determination unit 64 selects one link that is desired to operate as an Available Single Radio Link.
  • the Single Radio control unit 56 sets Available Single Radio Link information that describes information indicating the desired link in step S54.
  • step S51 if it is determined that there are no candidates, steps S52 and S53 are skipped, and the process proceeds to step S54.
  • the Single Radio control unit 56 sets Available Single Radio Link information that describes information indicating the candidate link in step S54.
  • step S52 if it is determined that the notification is to be made using Bitmap, the process proceeds to step S54.
  • the Single Radio control unit 56 sets Available Single Radio Link information in Bitmap format in step S54.
  • step S55 the Single Radio control unit 56 transitions to the link described in the Available Single Radio Link information and sets up standby using Single Radio in order to perform Single Radio operations. That is, the link described in the Available Single Radio Link information is set as the link for waiting for a data frame using Single Radio.
  • step S56 the Single Radio control unit 56 transmits a Block ACK frame to which information indicating an available link (Available Single Radio Link information) is added.
  • step S48 If it is determined in step S48 that it is not necessary to add information indicating available links, or if it is determined in step S50 that there are no candidate links, the process proceeds to step S56. In this case, the Single Radio control unit 56 transmits a normal Block ACK frame in step S56.
  • step S56 After the process in step S56, the EMLSR STA process in FIGS. 15 and 16 ends.
  • FIG. 17 is a diagram illustrating another operation sequence of the AP or the communication device on the data transmitting side (referred to as AP in the figure) and the EMLSR STA in the first embodiment of the present technology.
  • Timings t51 to 55 in FIG. 17 are the same processes as timings t1 to t5 in FIG. 4, so a description thereof will be omitted.
  • EMLSR STA determines at timing t56 that it is difficult to use Radio3 at the next transmission timing (timing t57) and that it is possible to use Radio1. and includes the Available Single Radio Link information in the Single Radio Block ACK Frame and sends it to the AP.
  • the AP receives the Single Radio Block ACK Frame that includes the Available Single Radio Link information, and the EMLSR STA understands that Radio1 is available.
  • the AP listens for data from the STA using Radio1.
  • EMLSR STA determines whether there is undelivered data from the AP or data sent by EMLSR STA, and if it is determined that either data exists as a result of this determination, EMLSR STA However, the Available Single Radio Link information may be sent to the AP. At this time, the EMLSR STA may determine only whether there is undelivered data from the AP or whether there is data to be transmitted by the EMLSR STA.
  • EMLSR STA transmits data addressed to the AP using Radio1.
  • the AP determines that it is difficult to use Radio2 at the next transmission timing (timing t59) and that it is possible to use Radio3, and sends the Available Single Radio Link information. Include it in a Single Radio Block ACK Frame and send it to EMLSR STA using Radio1.
  • the EMLSR STA receives the Single Radio Block ACK Frame that includes the Available Single Radio Link information, and the AP knows that Radio3 is available.
  • the AP again transmits data destined for EMLSR STA using Radio3 based on the predetermined access control procedure.
  • the AP can transmit the data using Radio3, so the data cannot be transmitted after receiving the Block ACK Frame. I can do it.
  • EMLSR STA that has received the Available Single Radio Link information from the AP can receive and transmit data from the AP more reliably by waiting using Radio3 described in the Available Single Radio Link information.
  • the latest transmission path status can be immediately notified at the timing of returning the Block ACK Frame.
  • the link can be specified immediately without having to wait for an RTS Frame from the data sending side as in the past.
  • the time required for exchanging redundant RTS frames and CTS frames in the conventional EMLSR data transmission sequence can be omitted, so the time required for exchanging RTS frames and CTS frames is reduced by the transmission opportunity (TXOP) for data transmission. It can be used effectively.
  • the number of A-MPDU aggregates can be optimized within the limited TXOP on a certain link.
  • bidirectional data transmission can be performed in a short time.
  • Real-Time Application data can be seamlessly transmitted.
  • Second embodiment (Next Single Radio Link information) >>
  • link information that can be used for data transmission is notified from the EMLSR STA on the data receiving side.
  • available link information is notified from a communication device (AP) on the data sending side.
  • system configuration of the second embodiment is similar to the system configuration of the first embodiment. Therefore, hereinafter, the system configuration of the first embodiment described above with reference to FIG. 1 is also used as the system configuration of the second embodiment.
  • FIG. 18 is a diagram showing an operation sequence of an AP or a communication device on the data transmitting side (referred to as AP in the figure) and EMLSR STA in the second embodiment of the present technology.
  • the solid line arrow represents the transmission of control information included in the delimiter after the signal
  • the dashed-dotted line arrow represents the transmission of the control information included in the padding of the signal.
  • the processing at timing t101 in FIG. 18 is the same as the processing at timing t3 in FIG. That is, as control frames, for example, a Multi-User RTS frame (hereinafter referred to as an RTS frame) and a CTS frame are exchanged, and at timing t101, the AP starts data transmission. EMLSR STA starts receiving data.
  • RTS frame Multi-User RTS frame
  • CTS frame CTS frame
  • the AP Before terminating data transmission using Radio1, the AP acquires the link status immediately before the end of A-MPDU transmission by checking the usage status of Pre-Configure Link, etc., and uses it for the next data transmission. Determine available links.
  • Radio3 is being used for other transmission (BUSY state), and data transmission using Radio2 is possible.
  • the AP includes Next Single Radio Link information indicating the available link in the next data transmission in Padding, Send as shown.
  • the EMLSR STA on the data receiving side sets the link (Radio2) used for the next data transmission to Next Single Radio Can be identified based on link information. This allows the EMLSR STA on the data receiving side to listen for, for example, RTS frames using the configured Radio2 link.
  • “to perform next” means to perform after receiving the Next Single Radio Link information, and the timing may be immediately after receiving the Next Single Radio Link information, or later in time. If so, it doesn't have to be right after.
  • EMLSR STA After completing the data transmission, EMLSR STA transmits an ACK frame using Radio1 at timing t102. The AP receives the ACK frame using Radio1.
  • the AP transmits an RTS frame using Radio2 to notify the EMLSR STA of the start of data transmission.
  • the EMLSR STA listens for the RTS frame using Radio2 based on the Next Single Radio Link information and receives the RTS frame.
  • EMLSR STA returns a CTS frame to the AP using Radio2.
  • the AP receives the CTS frame using Radio2.
  • the AP can continue transmitting data addressed to EMLSR STA using Radio2.
  • EMLSR STA continues to receive data using Radio2.
  • the AP grasps the usage status of Pre-Configure Link, obtains the status of each link just before the end of A-MPDU transmission, and determines which links can be used for the next data transmission. Determine.
  • Radio1 is being used for other transmission (BUSY state), and data transmission using Radio3 is possible.
  • the AP includes the Next Single Radio Link information in the Padding and makes a single point. Send as indicated by the dashed arrow.
  • EMLSR STA can identify the link (Radio3) on which data transmission will continue based on the Next Single Radio Link information. Therefore, the EMLSR STA can, for example, listen for RTS frames using the Radio3 link.
  • EMLSR STA After completing the data transmission, EMLSR STA transmits an ACK frame using Radio2 at timing t106. The AP receives the ACK frame using Radio2.
  • the AP transmits an RTS frame using Radio3 to notify the EMLSR STA of the start of data transmission.
  • the EMLSR STA listens for the RTS frame using Radio3 based on the Next Single Radio Link information and receives the RTS frame.
  • EMLSR STA returns a CTS frame to the AP on Radio3.
  • the AP receives the CTS frame on Radio3.
  • the AP can continue transmitting data addressed to EMLSR STA using the link (Radio3).
  • EMLSR STA continues to receive data using Radio3.
  • the AP grasps the usage status of the Pre-Configure link, obtains the status of each link just before the end of A-MPDU transmission, and determines whether it can be used for the next data transmission. Determine the link.
  • Radio2 is being used for another transmission (BUSY state), and data transmission using Radio1 is possible.
  • Next Single Radio Link information is included in the padding and transmitted as shown by the dashed-dotted arrow.
  • EMLSR STA can identify the link (Radio 1) on which data transmission will continue based on the Next Single Radio Link information. Therefore, EMLSR STA, for example, listens for RTS frames using the Radio1 link.
  • EMLSR STA After completing the data transmission, EMLSR STA transmits an ACK frame using Radio3 at timing t110. The AP receives the ACK frame using Radio3.
  • the AP transmits an RTS frame using Radio1 to notify the EMLSR STA of the start of data transmission.
  • the EMLSR STA listens for RTS frames using Radio1 based on the Next Single Radio Link information and receives the RTS frames.
  • EMLSR STA returns a CTS frame to the AP using Radio1.
  • the AP receives the CTS frame using Radio1.
  • the AP can continue sending data to EMLSR STA using the link (Radio1).
  • EMLSR STA continues to receive data using Radio1.
  • the transmission path can be used seamlessly when transmitting real-time data.
  • the data transmitting device While transmitting data, the data transmitting device notifies the Next Single Radio Link information based on the latest Pre-Configure Link usage status, so the data receiving device can You can understand the Pre-Configure Link that allows you to continue radio communication. Thereby, data transmission can be performed using the link (Radio) that will perform data transmission next (later in time).
  • Next Single Radio Link information that is available at that time in the data transmitting device of the Pre-Configure Link is transmitted.
  • a control frame may be constructed to include Next Single Radio Link information in the header, and the latest status may be transmitted at any timing.
  • This Next Single Radio Link information is information representing the link with the lowest noise level that is subject to interference, selected from the pre-configured Pre-Configure Links, and is expressed in approximately 4 bits.
  • this Next Single Radio Link information includes information in bitmap format that indicates a link whose interference noise level is below a predetermined threshold, which has been determined to be available from pre-configured links. You can do it like this.
  • the device configuration of the second embodiment is similar to that of the first embodiment. Therefore, hereinafter, the device configuration of the first embodiment described above with reference to FIGS. 5, 6, and 7 is also used as the device configuration of the second embodiment.
  • the process of receiving the Block ACK Frame is performed by, for example, Performed by the first data reception block when a Block ACK Frame is received on the Radio1 link.
  • the signal waveform is detected by the Multi-Link RF detection unit 27-1, and the baseband signal is extracted from the detected waveform by the Multi-Link PHY reception unit 28-1.
  • the frame is detected by the Multi-Link MAC determination unit 29-1.
  • the Multi-Link control unit 23 recognizes that the Block ACK Frame has been received as one of the control frames.
  • the Multi-Link control unit 23 selects the Next Single Radio Link information based on the available link information supplied from the Pre-Configure Link determination unit 31. Construct (generate) , replace Padding and send.
  • the Multi-Link control unit 32 determines whether Next Single Radio Link information is included in Padding. constructs information indicating that it is, replaces the final delimiter, and sends it.
  • the process of transmitting the Block ACK Frame is performed under the control of the Single Radio control unit 56. Executed by send block.
  • the transmission data is constructed as a Control Frame by the Single Radio MAC processing unit 53, converted to a baseband signal by the Single Radio PHY transmission unit 54, subjected to high frequency processing by the Single Radio RF signal processing unit 55, and transmitted from the antenna. .
  • the process of receiving the A-MPDU frame is executed by the data reception block under the control of the Single Radio control unit 56.
  • the waveform of the received data part of the signal received by the antenna is detected by the Single Radio RF signal detection unit 69, and the baseband signal extracted from the detected waveform is detected as a predetermined A-MPDU frame in the Single Radio channel.
  • the reception process is executed by the Single Radio PHY reception unit 68.
  • the Single Radio MAC determination unit 67 analyzes the delimiter information and separates the MPDU portion.
  • the Next Single Radio Link information is included in the delimiter or padding sent from the AP, the Next Single Radio Link information is supplied to the Single Radio control unit 56.
  • FIG. 19 is a diagram illustrating a configuration example of a frame according to the second embodiment of the present technology.
  • the frame in FIG. 19 is a frame configured as an action frame or a management frame indicating that it corresponds to a sequence for notifying information on available links.
  • the frame in FIG. 19 is defined as an EML Operation Mode Notification Frame. Further, the frame in FIG. 19 is appropriately communicated when the EMLSR STA corresponding to the EMLSR performs an association operation with the AP.
  • the EML Operation Mode Notification Frame is configured to include Category, EHT Action, Dialog Token, and EML Control Field.
  • EML Control Field includes EMLSR Mode bit (0th bit), EMLMR Mode bit (1st bit), EMLSR Link Bitmap bit (2nd bit to 17th bit), Reserved bit (18th bit to 22nd bit), Next Configured to include the Single Radio Link bit (23rd bit).
  • the Next Single Radio Link bit included in the EML Control Field is a bit that indicates whether link information that can be used for the next data transmission using this technology can be notified.
  • the configuration of the frame that includes the Next Single Radio Link bit is not limited to the configuration of the action frame in FIG. 19.
  • the Next Single Radio Link bit may be set in frames other than the frame of FIG. 19, if necessary.
  • FIG. 20 is a diagram illustrating a first configuration example of an A-MPDU frame according to the second embodiment of the present technology.
  • the A-MPDU frame in Figure 20 alternately aggregates (concatenates) delimiters that indicate frame boundaries and MAC Protocol Data Units (MPDUs) that contain actual data, and adds padding to the end. It consists of
  • the delimiter is the EOF bit (0th bit), After Info bit (1st bit), MPDU Length bit (2nd bit to 14th bit), CRC bit (16th bit to 23rd bit), Delimiter Signature bit (1st bit). 24 bits to 31st bits).
  • the After Info bit is a part that is reserved in the conventional delimiter, and is information that identifies that Next Single Radio Link information is included in the subsequent padding.
  • the device on the data receiving side can understand that the Next Single Radio Link information is included in the Padding by seeing that the After Info bit is set to 1.
  • the delimiter that includes the After Info bit is preferably the delimiter before the last MDPU (that is, the last delimiter), as shown in Figure 20, but the After Info bit does not include the delimiter in other positions. may be included in
  • padding is configured to be added to the end of A-MPDU in 0 to 3 bytes.
  • the configuration of the new padding part using this technology includes the Next Single Radio Link bit (0th bit to 3rd bit), CRC bit (4th bit to 7th bit), and if necessary, the Padding bit (8th bit 23rd bit to 23rd bit).
  • the Next Single Radio Link bit is the Next Single Radio Link information.
  • CRC may be added as necessary to ensure the Next Single Radio Link information is sent.
  • Normal padding has a length of 0Byte to 3Byte as described above, but if the conventional padding is 0Byte or 1Byte, the length of the padding can be increased by adjusting the MPDU Length, and Next Single using this technology can be used. Radio Link information may also be included.
  • Next Single Radio Link bit may be included in the last delimiter instead of Padding.
  • FIG. 21 is a diagram illustrating a second configuration example of an A-MPDU frame according to the second embodiment of the present technology.
  • the A-MPDU frame in FIG. 21 differs from the A-MPDU frame in FIG. 20 in the structure of padding.
  • Padding is configured to include Next Single Radio Link Bitmap bits (0th bit to 15th bit) and CRC bits (16th bit to 23rd bit).
  • the Next Single Radio Link Bitmap bit in Figure 21 is Next Single Radio Link information in bitmap format, and can notify the data receiving side of up to 16 links.
  • a CRC may be added as necessary to ensure that the Next Single Radio Link information in FIG. 21 is sent.
  • the Next Single Radio Link information is configured as a total of 24 bits (3 Byte) information. If this information length is longer than the conventional Padding bit length, that is, if the conventional Padding is not included or if the Padding is 1 to 2 Bytes, the MPDU Length of the delimiter is added to the Next Single Radio Link information.
  • the CRC may be stored in Padding.
  • FIG. 22 is a diagram showing a first configuration example of the A-Control field of an arbitrary frame.
  • FIG. 22 shows an example of the structure of a frame when Next Single Radio Link information is notified using any frame other than the A-MPDU frame that includes control information and the like.
  • the frame in FIG. 22 is configured to include fields Frame Control, Duration/ID, Address1 to Address4, Sequence Control, QoS Control, HT Control, Frame Body, and FCS.
  • the fields Frame Control, Duration/ID, Address1 to Address4, Sequence Control, QoS Control, and HT Control are the MAC header part.
  • the Frame Control field is information indicating the type of frame.
  • the Duration/ID field is information indicating the frame duration and identifier.
  • the Address1 to Address4 fields are multiple address fields indicating the sender and receiver.
  • the Sequence Control field is information indicating the sequence number of the frame.
  • the QoS Control field is a control parameter for QoS guarantee.
  • the HT Control field is a control parameter for high throughput.
  • the HT Control field is configured to include the 0th bit, the 1st bit, and the A-Control bit (2nd bit to 31st bit).
  • the A-Control field is defined in the HT Control field for future expansion, and if the 0th and 1st bits are 1, the 2nd to 31st bits can be used as the A-Control field. can.
  • the A-Control field is configured to include Control ID bits (bits 0 to 3), Next Single Radio Link bits (bits 4 to 7), and Reserved bits (bits 8 to 31). be done.
  • the Control ID bit is information indicating that Next Single Radio Link information is included.
  • the Next Single Radio Link bit is Next Single Radio Link information.
  • FIG. 23 is a diagram showing a second configuration example of the A-Control field of an arbitrary frame.
  • the arbitrary frame in FIG. 23 has a different structure of the A-Control field from the arbitrary frame in FIG. 22.
  • the A-Control field includes the Control ID bit (0th bit to 3rd bit), Next Single Radio Link Bitmap bit (4th bit to 19th bit), Reserved bit (20th bit to 31st bit) configured to include.
  • the Control ID bit is information indicating that Next Single Radio Link information is included.
  • the Next Single Radio Link Bitmap bit is Next Single Radio Link information in Bitmap format.
  • FIG. 24 is a diagram illustrating a configuration example of an aggregation frame according to the second embodiment of the present technology.
  • FIG. 24 shows a configuration example of an Aggregation Frame in which, for example, an action frame (Action Frame) is added to an arbitrary frame (Previous Frame).
  • Action Frame an action frame
  • Previous Frame an arbitrary frame
  • the action frame is added to any frame.
  • the frame in FIG. 24 is configured as an aggregation frame that combines, for example, a conventional control frame (Control Frame) with, for example, an EML Control Field and an action frame that includes Next Single Radio Link information of the present technology.
  • the action frame consists of Frame Control, Duration, TA, RA, EML Control field, the new field Next Single Radio Link, and CRC fields.
  • Frame Control, Duration, TA, and RA are the same as Frame Control, Duration, TA, and RA included in Single Radio Block ACK Frame in FIG. 9.
  • EML Control field includes EMLSR Pre-Configure Link information.
  • CRC is an error detection code
  • Next Single Radio Link information in Figure 24 may be notified in a format that specifies one link, as described above, or in a bitmap format so that all available links are notified. Good too.
  • the information may be notified as Next Single Radio Link information, which is a combination of information about one link that is the most likely candidate and information in a bitmap format indicating other available links.
  • the Aggregation Frame in FIG. 24 may be added in the form of an action frame to a data frame including A-MPDU instead of being added to a control frame. Furthermore, as shown in FIG. 24, the action frame may notify the Next Single Radio Link information alone without adding the action frame to any frame.
  • FIGS. 25 and 26 are flowcharts illustrating data transmission processing of the communication device (AP) on the data transmission side in the second embodiment of the present technology.
  • step S111 the data construction unit 22 receives transmission data addressed to EMLSR STA from the device control module 13 via the Data Buffer 21.
  • step S112 the Multi-Link control unit 23 performs detection settings to understand the usage status of Pre-Configure Link of EMLSR STA.
  • step S113 the Multi-Link control unit 23 acquires the status of the transmission opportunity (TXOP) on the current link for data transmission, and specifies the transmission possible duration using the acquired link.
  • TXOP transmission opportunity
  • step S114 the Multi-Link control unit 23 obtains the number of A-MPDUs, which is the number of MPDUs to be aggregated.
  • step S115 the Multi-Link control unit 23 determines whether to add Next Single Radio Link (NSRL) information of the present technology. If it is determined in step S115 that the Next Single Radio Link information is to be added, the process proceeds to step S116.
  • NRL Next Single Radio Link
  • step S116 the data construction unit 22 sets the bits reserved in the conventional delimiter as After Info bits and adds them to the delimiter.
  • step S117 the data construction unit 22 determines whether padding can be added. If it is determined in step S117 that padding cannot be added, the process proceeds to step S118.
  • step S118 the data construction unit 22 adjusts the length of the MPDU so that the Next Single Radio Link information can be included in the frame. After that, the process proceeds to step S119.
  • step S115 determines whether the Next Single Radio Link information is not to be added, or if it is determined in step S117 that padding can be added, the process also proceeds to step S119.
  • step S119 the data construction unit 22 acquires one MPDU subframe.
  • step S120 the data construction unit 22 constructs an A-MPDU frame. After that, the process proceeds to step S121 in FIG. 26.
  • step S121 the data construction unit 22 determines whether it is the end of the A-MPDU (frame) based on the number of A-MPDUs. If it is determined in step S121 that it is not the end of the A-MPDU, the process returns to step S115 and the subsequent processes are repeated.
  • step S121 If it is determined in step S121 that it is the end of the A-MPDU, the process proceeds to step S122.
  • step S122 the Pre-Configure Link determination unit 31 acquires its own Pre-Configure Link detection status.
  • step S123 the Multi-Link control unit 23 determines whether it is possible to use multiple Single Radio Links based on the detection status of its own Pre-Configure Links. If it is determined in step S123 that multiple Single Radio Links can be used, the process proceeds to step S124.
  • step S124 the Multi-Link control unit 23 determines whether information notifying the use of multiple Single Radio Links is to be written in Bitmap format. If it is determined in step S124 that the information notifying the use of multiple Single Radio Links is not written in Bitmap format, the process proceeds to step S125.
  • step S125 the Multi-Link control unit 23 selects one Next Single Radio Link.
  • the Multi-Link control unit 23 sets Next Single Radio Link information containing information indicating the selected link in step S126.
  • step S123 if it is determined that multiple links are not available, steps S124 and S125 are skipped, and the process proceeds to step S126.
  • the Multi-Link control unit 23 sets Next Single Radio Link information that describes information indicating one link in step S126.
  • step S124 if it is determined that the information notifying the use of multiple Single Radio Links should be written in Bitmap format, the process proceeds to step S126.
  • the Multi-Link control unit 23 sets Next Single Radio Link information in Bitmap format in step S126.
  • step S127 the data construction unit 22 determines whether padding for 4-byte alignment is necessary at the end of the A-MPDU. If it is determined in step S127 that padding is necessary, the process advances to step S128.
  • step S1208 the data construction unit 22 adds padding to satisfy the alignment length.
  • step S127 If it is determined in step S127 that padding is not necessary, the process in step S128 is skipped and the process proceeds to step S129.
  • step S129 the Multi-Link control unit 23 controls the first data transmission block or the second data transmission block to transmit the constructed A-MPDU frame, and then transmits the constructed A-MPDU frame. The data transmission process ends.
  • FIGS. 27 and 28 are flowcharts illustrating data reception processing of the EMLSR STA in the second embodiment of the present technology.
  • step S141 the Single Radio control unit 56 of the EMLSR STA operates a link defined as a Pre-Configure Link by exchanging a predetermined frame with the communication device (AP) on the data transmitting side, for example, to create a Single Radio Set the radio reception operation.
  • AP communication device
  • step S142 the Single Radio control unit 56 determines whether a Multi-User RTS frame (hereinafter referred to as an RTS frame) has been received as a control frame addressed to itself through any Pre-Configure link. If it is determined in step S142 that the RTS frame addressed to itself has not been received, the process returns to step S141 and the subsequent processes are repeated.
  • a Multi-User RTS frame hereinafter referred to as an RTS frame
  • step S142 If it is determined in step S142 that an RTS frame addressed to itself has been received, the process proceeds to step S143.
  • step S143 the Single Radio control unit 56 determines whether data reception using the Single Radio link that received the RTS frame is possible. If it is determined in step S143 that data cannot be received, the process returns to step S141 and the subsequent processes are repeated.
  • step S143 If it is determined in step S143 that data reception is possible, the process proceeds to step S144.
  • step S144 the Single Radio control unit 56 transmits a control frame (CTS frame) using the Single Radio link that received the RTS frame.
  • CTS frame control frame
  • step S145 the Single Radio control unit 56 waits for data using the Single Radio link.
  • step S146 the Single Radio data processing unit 52 receives the MPDU subframe using the Single Radio link.
  • step S147 the Single Radio control unit 56 determines whether it is at the delimiter position. If it is determined in step S147 that the position is a delimiter, the process proceeds to step S148.
  • step S148 the Single Radio control unit 56 determines whether the After Info bit is in the delimiter. If it is determined in step S148 that the After Info bit is in the delimiter, the process proceeds to step S149.
  • step S149 the Single Radio data processing unit 52 performs settings for understanding the usage status of the transmission path, such as carrier detection of Single Radio Link. After that, the process returns to step S146, and the subsequent processes are repeated.
  • step S148 If it is determined in step S148 that the After Info bit is not in the delimiter, the process returns to step S146 and the subsequent processes are repeated.
  • step S147 determines whether the position is not the delimiter position. If it is determined in step S147 that the position is not the delimiter position, the process proceeds to step S150 in FIG. 28.
  • step S150 the Single Radio control unit 56 determines whether it is the padding position. If it is determined in step S150 that the position is not the padding position, the process returns to step S146 and the subsequent processes are repeated.
  • step S150 If it is determined in step S150 that it is the padding position, the process proceeds to step S151.
  • step S151 the Single Radio control unit 56 determines whether Next Single Radio Link (NSRL) information is present in Padding. If it is determined in step S151 that the Next Single Radio Link information is in Padding, the process proceeds to step S152.
  • NRL Next Single Radio Link
  • step S152 the Single Radio control unit 56 refers to the Next Single Radio Link information and determines whether there are multiple candidates. For example, if it is determined in step S152 that there are multiple candidates, such as when Next Single Radio Link information is written in Bitmap format, the process proceeds to step S153.
  • step S153 the Pre-Configure Link determination unit 64 obtains the carrier detection result of its own Single Radio link. The process then proceeds to step S154.
  • step S152 If it is determined in step S152 that there are no multiple candidates, the process also proceeds to step S154.
  • step S154 the Single Radio control unit 56 selects the optimal Single Radio Link and determines whether the selected Single Radio Link can be used based on the carrier detection result of its own Single Radio link. Note that even if a specific link is specified instead of a bitmap format, it is determined whether the specified Single Radio Link can be used.
  • step S155 the Single Radio control unit 56 determines whether Single Radio Link (SRL) is available. If it is determined in step S155 that Single Radio Link is available, the process proceeds to step S156.
  • SRL Single Radio Link
  • step S156 settings are made to continue receiving data using the available Single Radio Link.
  • step S155 if it is determined in step S155 that Single Radio Link is not available, the process advances to step S157.
  • step S157 the Single Radio control unit 56 temporarily sets continuous reception of data using the current Single Radio Link, and prepares for the next data transmission based on a predetermined access control procedure.
  • step S156 or S157 the data reception processing in FIGS. 27 and 28 ends.
  • next Single Radio Link by including information in bitmap format, the data receiver can also have the option to choose the link that is sure to be used. can do.
  • TXOP transmission opportunities
  • the number of A-MPDU aggregates can be optimized within the limited TXOP of a certain link.
  • FIG. 29 is a diagram showing an operation sequence of an AP or a communication device on the data transmitting side (referred to as AP in the figure) and EMLSR STA in the third embodiment of the present technology.
  • the solid line arrow represents the transmission of control information included in the delimiter at the end of the signal
  • the dashed-dotted line arrow represents the transmission of control information included in the padding at the end of the signal. represents.
  • the processing at timing t151 in FIG. 29 is the same as the processing at timing t101 in FIG. That is, the AP acquires the link status immediately before the end of A-MPDU transmission during data transmission using Radio 1, and determines a link that can be used for the next data transmission. The AP writes Next Single Radio Link information, which is link information that can be used for the next data transmission, in the data being transmitted and transmits it.
  • the EMLSR STA that is receiving data on Radio 1 determines its own available links based on the detection results of the Pre-Configure link usage status during or immediately after receiving the data. Note that the Next Single Radio Link information included in the data may also be referenced to determine the link that can be used by the user. For example, if the EMLSR STA determines that Radio2 and Radio3 are available, it sends a Block ACK frame to the AP at timing t152 that includes Available Single Radio Link information indicating Radio2 and Radio3 as available links. do.
  • the AP that receives the Block ACK frame considers the Available Single Radio Link information included in the Block ACK frame and its own Next Single Radio Link information to identify the next link (Radio 2) to transition to.
  • the AP can obtain information on links to which EMLSR STA, which is the data receiving side, can reliably transition, and data transmission can be carried out more reliably.
  • EMLSR STA can identify the link (Radio2) on which data transmission should continue based on the Next Single Radio Link information of the data transmitting AP and its own Available Single Radio Link information. For example, RTS frames can be waited for using a Radio2 link.
  • the AP transmits a Multi-User RTS frame (hereinafter referred to as an RTS frame) as a control frame using the Radio2 link.
  • RTS frame a Multi-User RTS frame
  • the EMLSR STA that received the RTS frame returns the CTS frame to the AP at timing t154, as in the conventional method. This allows the AP to continue transmitting data destined for EMLSR STA using the link (Radio2) that received the RTS frame.
  • the AP that received the CTS frame starts transmitting data at timing t155.
  • the AP includes Next Single Radio Link information, which is link information that can be used for the next data transmission, in the data being transmitted and transmits it.
  • EMLSR STA receiving data on Radio2 determines its own available links during or immediately after receiving data. For example, if the EMLSR STA determines that Radio1 and Radio3 are available, it sends a Block ACK frame containing Available Single Radio Link information indicating Radio1 and Radio3 as available links to the AP at timing t156. do.
  • the AP that receives the Block ACK frame identifies the next link (Radio3) to transition to, considering the Available Single Radio Link information included in the Block ACK frame and its own Next Single Radio Link information.
  • the AP transmits the RTS frame using the Radio3 link.
  • the EMLSR STA that received the RTS frame returns the CTS frame to the AP at timing t158, as in the conventional method. This allows the AP to continue sending data to EMLSR STA using the link (Radio3) that received the RTS frame.
  • the AP that received the CTS frame starts transmitting data at timing t159.
  • the AP includes Next Single Radio Link information, which is link information that can be used for the next data transmission, in the data being transmitted and transmits it.
  • EMLSR STA receiving data on Radio2 determines its own available links during or immediately after receiving data. For example, if EMLSR STA determines that Radio1 and Radio3 can be used, at timing t160, it sends a Block ACK frame containing Available Single Radio Link information indicating Radio1 and Radio3 as available links to the AP. do.
  • the AP that receives the Block ACK frame identifies the next link (Radio 1) to transition to, considering the Available Single Radio Link information included in the Block ACK frame and its own Next Single Radio Link information.
  • the AP transmits an RTS frame using the Radio1 link.
  • the EMLSR STA that received the RTS frame returns the CTS frame to the AP at timing t162, as in the conventional method. This allows the AP to continue transmitting data destined for EMLSR STA using the link (Radio1) that received the RTS frame.
  • the AP that received the CTS frame starts data transmission at timing t163.
  • the AP includes Next Single Radio Link information, which is link information that can be used for the next data transmission, in the data being transmitted and transmits it.
  • the AP can transmit, for example, an RTS frame on a link that can be used by both parties.
  • the EMLSR STA can continue data transmission on the link that received the RTS frame, for example by returning the CTS frame.
  • this example describes an example in which RTS frames and CTS frames are exchanged as control information, but if a reliable link is identified between the data sending side and the data receiving side, these control frames can be exchanged. It is also possible to perform data transmission without doing so.
  • the device configuration of the third embodiment is similar to that of the first embodiment. Therefore, hereinafter, the device configuration of the first embodiment described above with reference to FIGS. 5, 6, and 7 will be used as the device configuration of the third embodiment.
  • the process of receiving the Single Radio Block ACK Frame is as follows: For example, if the Single Radio Block ACK Frame is received using the Radio1 link, this is done by the first data reception block.
  • the signal waveform is detected by the Multi-Link RF detection unit 27-1, and the baseband signal is extracted from the detected waveform by the Multi-Link PHY reception unit 28-1.
  • the frame is detected by the Multi-Link MAC determination unit 29-1.
  • the Multi-Link control unit 23 recognizes that the Single Radio Block ACK Frame has been received as one of the control frames.
  • the Pre-Configure Link determination unit 31 notifies the Multi-Link control unit 23 of this fact, and the Multi-Link control unit 23 A link (Radio) that can be used by EMLSR STA is identified, and communication on the identified link (Radio) is controlled.
  • the Multi-Link control unit 23 selects the Next Single Radio Link information based on the available link information supplied from the Pre-Configure Link determination unit 31. , replace Padding and send.
  • the Multi-Link control unit 32 determines whether Next Single Radio Link information is included in Padding. Build information indicating that the last delimiter is replaced and sent.
  • the process of transmitting the Single Radio Block ACK Frame is controlled by the Single Radio control unit 56. This is executed by the data transmission block.
  • the transmission data is constructed as a Control Frame by the Single Radio MAC processing unit 53, converted to a baseband signal by the Single Radio PHY transmission unit 54, subjected to high frequency processing by the Single Radio RF signal processing unit 55, and transmitted from the antenna. .
  • the process of receiving the A-MPDU frame is executed by the data reception block under the control of the Single Radio control unit 56.
  • the waveform of the received data part of the signal received by the antenna is detected by the Single Radio RF signal detection unit 69, and the baseband signal extracted from the detected waveform is detected as a predetermined A-MPDU frame in the Single Radio channel.
  • the Single Radio PHY reception unit 68 executes the reception process, and the Single Radio MAC determination unit 67 analyzes the delimiter information and separates the MPDU portion.
  • the delimiter sent from the AP includes Next Single Radio Link information
  • the Next Single Radio Link information is supplied to the Single Radio control unit 56.
  • FIG. 30 is a diagram showing a fourth configuration example of the Single Radio Block ACK Frame.
  • the Single Radio Block ACK Frame in Figure 30 differs from the Single Radio Block ACK Frame in Figure 9 in the configuration of the BA Control Field.
  • BA Control Field consists of BA ACK Policy bit (0th bit), BA Type bit (1st bit to 4th bit), Single Radio Link Grant bit (5th bit), Available Single Link bit (6th bit to 9th bit). bit), Reserved bits (10th bit and 11th bit), and TID_INFO bits (12th bit to 15th bit).
  • the Single Radio Link Grant bit is information indicating whether the Next Single Radio Link is required or not, as notified by the AP on the data sending side. Note that when the Block ACK frame has the minimum necessary configuration, the Block ACK frame only needs to have the Single Radio Link Grant bit described above, but it may also include the Available Single Link bit.
  • the Available Single Link bit is the Available Single Radio Link information indicating an available link.
  • the EMLSR STA on the data receiving side will also take into account the available links and send both links. One link can be notified as Available Single Radio Link.
  • the data transmission process of the AP in the third embodiment of the present technology is basically the same as the data transmission process of the AP in the second embodiment described above with reference to FIGS. The explanation will be omitted.
  • ⁇ STA processing> 31 and 32 are flowcharts illustrating data reception processing of the EMLSR STA in the third embodiment of the present technology.
  • steps S171 to S180 in FIGS. 31 and 32 is the same as the processing in steps S141 to S150 in FIGS. 27 and 28, so the description thereof will be omitted.
  • step S181 in FIG. 32 the Pre-Configure Link determination unit 64 acquires the carrier detection result of its own Single Radio Link.
  • step S182 the Single Radio control unit 56 determines whether the Next Single Radio Link information is in the Padding. If it is determined in step S182 that the Next Single Radio Link information is in Padding, the process proceeds to step S183.
  • step S183 the Single Radio control unit 56 refers to the Next Single Radio Link information and determines whether there are multiple candidates. For example, if it is determined in step S183 that there are multiple candidates, such as when the Next Single Radio Link information is written in Bitmap format, the process proceeds to step S184.
  • step S184 the Pre-Configure Link determination unit 64 selects the optimal Single Radio Link and determines whether the selected Single Radio Link can be used. The process then proceeds to step S185.
  • step S183 If it is determined in step S183 that there are no multiple candidates, the process also proceeds to step S185.
  • step S185 the Pre-Configure Link determining unit 64 determines whether there is a usable link. Note that even if a specific link is specified instead of a bitmap format, it is determined whether the specified Single Radio Link can be used. If it is determined in step S185 that there is an available link, the process proceeds to step S186.
  • step S186 the Single Radio control unit 56 determines whether to include the available link in the ACK and notify it. If it is determined in step S186 that the notification is to be made by ACK, the process proceeds to step S187.
  • step S187 the Single Radio control unit 56 acquires the Available Single Radio Link information in order to include it in the ACK and notify it. The process then proceeds to step S188.
  • step S182 if it is determined that the Next Single Radio Link information is not in Padding, the processes in steps S182 to S187 are skipped and the process advances to step S188.
  • step S185 If it is determined in step S185 that there is no available link, or if it is determined in step S186 not to be notified by including it in the ACK, the process also proceeds to step S188.
  • step S188 the Single Radio control unit 56 transmits a Block ACK frame. Note that when the Available Single Radio Link information is acquired in step S187, the Block ACK frame that is transmitted includes the Block ACK frame.
  • step S189 the Single Radio control unit 56 sets Single Radio Link as the data reception link.
  • Fourth embodiment (Quick Reserve Single Radio Control Frame) >> Next, as a fourth embodiment, an example will be described in which information for securing a transmission opportunity in advance is notified by an available link from the EMLSR STA on the data receiving side.
  • FIG. 33 is a diagram showing the operation sequence of EMLSR STA in the fourth embodiment of the present technology.
  • FIG. 33 the operation timing of the AP is shown in parentheses. In the description of the operation of EMLSR STA in FIG. 33, reference is made to the operation timing of the data transmitting side communication device (AP) shown in FIG. 34 as appropriate.
  • the EMLSR STA receives a Multi-User RTS frame (hereinafter referred to as an RTS frame) as a control frame transmitted by the AP using Radio1.
  • RTS frame a Multi-User RTS frame
  • EMLSR STA transmits a CTS frame to the AP using Radio1.
  • EMLSR STA starts receiving data sent by the AP using Radio1.
  • EMLSR STA After receiving the data, at timing t204, EMLSR STA transmits Block ACK Frame using Radio1.
  • EMLSR STA wants to continue receiving data, at timing t205, it transitions to the link (Radio 2) for which it wants to secure a usage opportunity in advance, and creates a Quick Reserve Single that includes usage reservation information to secure a usage opportunity in advance on Radio 2. Transmit the Radio Control Frame (Q in the diagram) using Radio2.
  • a link for which a usage opportunity is to be secured in advance is a link whose usage reservation information indicates that the usage opportunity is to be secured in advance.
  • EMLSR STA before sending the Quick Reserve Single Radio Control Frame, EMLSR STA sends the Quick Reserve Single Radio information indicating that it operates on Radio2, which is a link that it wants to secure the opportunity to use in advance, to the Block ACK Frame sent back using Radio1. It may also be added to notify the AP that sent the data.
  • the AP on the data sending side is operating in multi-link mode, reception is possible on any link (Radio), so the AP can receive the Quick Reserve Single Radio Control Frame using any link. can do.
  • the AP on the data sending side can continue Single Radio operation by EMLSR STA using the link (Radio2) that EMLSR STA wants to secure the opportunity to use in advance, without exchanging control frames.
  • the A-MPDU data frame can be transmitted.
  • the AP can know in advance the link (Radio) on which the EMLSR STA operates as Single Radio.
  • the EMLSR STA can receive the A-MPDU frame using the same link that transmitted the Quick Reserve Single Radio Control Frame. This makes it possible to reduce the time required to exchange control frames using RTS frames and CTS frames, which was necessary in the conventional system.
  • the EMLSR STA can determine the Single Radio Link information that is valid at the time the Useful Single Radio Link information is acquired. That is, the EMLSR STA can specify the link (Radio) to which the Quick Reserve Single Radio Control Frame should be transmitted, using the Useful Single Radio Link information.
  • EMLSR STA After receiving the data, at timing t207, EMLSR STA sends a Block ACK Frame to the AP using Radio2.
  • EMLSR STA can determine that it is possible to transition to Radio3 and continue data transmission after operation using Radio2, so at timing t208, EMLSR STA uses Quick Reserve Single Radio Control Send Frame using Radio3.
  • the AP will receive the Quick Reserve Single Radio Control Frame correctly. Can not. Therefore, the A-MPDU frame, which is data, is no longer transmitted from the AP.
  • EMLSR STA defines Open Duration information in advance in the Quick Reserve Single Radio Control Frame described above.
  • the Open Duration information is information indicating the valid period of the usage opportunity.
  • the EMLSR STA If the A-MPDU frame is not transmitted within the validity period indicated by the Open Duration information, the EMLSR STA generates an Open Reserve Single Radio Control Frame (O in the figure) at timing t209 indicating cancellation of the use of Radio3, Transmit to AP using Radio3. This will open up opportunities to use the Radio3 link.
  • EMLSR STA transitions to Radio 1 and transmits the Quick Reserve Single Radio Control Frame at timing t210.
  • the data transmitting AP receives the A-data frame at timing t211 without exchanging control frames.
  • MPDU frames can be sent.
  • the EMLSR STA Immediately after transmitting the Quick Reserve Single Radio Control Frame, the EMLSR STA receives the A-MPDU frame using Radio1, and transmits the Block ACK Frame using Radio1 at timing t212.
  • EMLSR STA When transmitting data to the data transmitting AP after receiving the A-MPDU frame, EMLSR STA transmits Quick Reserve Single Radio Control Frame using Radio1 at timing t213, and then at timing t214, A-MPDU frames can also be transmitted using Radio1.
  • the AP transmits a Block ACK Frame to the EMLSR STA using Radio1.
  • FIG. 34 is a diagram showing an operation sequence of the communication device (AP) on the data transmission side in the fourth embodiment of the present technology, which corresponds to the operation sequence of the EMLSR STA of FIG. 33.
  • FIG. 34 the operation timing of EMLSR STA is shown in parentheses. Note that in the description of the operation of the AP in FIG. 34, reference is made to the operation timing of the EMLSR STA shown in FIG. 33.
  • the AP transmits a Multi-User RTS frame (hereinafter referred to as an RTS frame) as a control frame to the EMLSR STA using Radio1.
  • RTS frame a Multi-User RTS frame
  • the AP receives the CTS frame transmitted from the EMLSR STA using Radio1.
  • the AP starts transmitting an A-MPDU frame, which is a data frame, to the EMLSR STA using Radio1.
  • the AP After transmitting the data, the AP receives the Block ACK Frame transmitted from the EMLSR STA at timing t204 using Radio1.
  • Block ACK Frame sent from EMLSR STA contains information about the link that sends the Quick Reserve Single Radio Control Frame (Quick Reserve Single Radio information)
  • the AP will continue to transmit data to the link (Radio2 ) to understand what is being done.
  • the data sending side AP receives the Quick Reserve Single Radio Control Frame sent from EMLSR STA using Radio2 at timing t205, and transmits the A-MPDU frame using Radio2 at timing t206. be able to.
  • the AP After transmitting the data, the AP receives the Block ACK Frame transmitted from the EMLSR STA at timing t207 using Radio2.
  • Block ACK Frame sent from EMLSR STA contains information about the link that sends the Quick Reserve Single Radio Control Frame (Quick Reserve Single Radio information)
  • the AP will continue to transmit data to the link (Radio3 ) to understand what is being done.
  • data transmission by another communication device may start immediately before receiving the Quick Reserve Single Radio Control Frame, resulting in the AP going into a BUSY state.
  • the AP cannot receive the Quick Reserve Single Radio Control Frame transmitted from the EMLSR STA, the AP cannot transmit the A-MPDU frame using Radio3.
  • EMLSR STA since EMLSR STA can also grasp the situation in which transmission of this A-MPDU frame does not start, EMLSR STA transmits Open Reserve Single Radio Control Frame (O in the figure) at timing t209. Then, at timing t210, Quick Reserve Single Radio Control Frame is transmitted by EMLSR STA using another link (Radio1).
  • the AP on the data sending side is operating in multi-link mode, reception is possible on any link (Radio), so the AP receives the Quick Reserve Single Radio Control Frame using any link. be able to.
  • the AP on the data transmitting side does not exchange the conventional control frame at timing t211, and instead sends A-MPDU Frames can be transmitted using Radio1.
  • the AP After transmitting the A-MPDU frame on the link (Radio1), the AP receives the Block ACK Frame transmitted from the EMLSR STA at timing t212. Furthermore, if EMLSR STA wishes to continue using the link, EMLSR STA will include information on the link that sends the Quick Reserve Single Radio Control Frame (Quick Reserve Single Radio information) in this Block ACK Frame.
  • the AP uses the Quick Reserve Single Radio information sent from EMLSR STA using Radio3 at timing t213. Receive Reserve Single Radio Control Frame.
  • the AP continues to receive the A-MPDU frame transmitted from the EMLSR STA at timing t214.
  • the AP transmits a Block ACK Frame, which is a response frame for acknowledgment of receipt corresponding to the A-MPDU frame transmitted from the EMLSR.
  • EMLSR STA can secure the opportunity to continue using the link (Radio) used for transmission.
  • the device on the data receiving side transitions to one of the available Pre-Configure Links immediately after receiving data addressed to itself, and the control frame is sent from the device on the data sending side via the new link.
  • a control frame indicating that a usage opportunity is to be secured in advance is transmitted in advance. This makes it possible to secure a link to be used as Single Radio in advance.
  • a control frame is sent from the data receiving device to release the previously secured Single Radio Link. Ru.
  • the device transmitting data may include information in the data frame being transmitted indicating which radio it will use to transmit the next Single Radio. good.
  • the device configuration of the fourth embodiment is similar to that of the first embodiment. Therefore, hereinafter, the device configuration of the first embodiment described above with reference to FIGS. 5, 6, and 7 will be used as the device configuration of the fourth embodiment.
  • the process of receiving the Quick Reserve Single Radio Control Frame can be performed on any link as long as the transmission line is not in a BUSY state. For example, if the Quick Reserve Single Radio Control Frame is received on the Radio1 link, this is done by the first data reception block.
  • the signal waveform is detected by the Multi-Link RF detection unit 27-1, and the baseband signal is extracted from the detected waveform by the Multi-Link PHY reception unit 28-1.
  • the frame is detected by the Multi-Link MAC determination unit 29-1.
  • the Pre-Configure Link determination unit 31 notifies the Multi-Link control unit 23 of this fact, and the Multi-Link control unit 23 A link (Radio) that can be used by STA is identified, and communication on that link (Radio) is controlled.
  • the Multi-Link control unit 32 uses this information based on the available link information supplied from the Pre-Configure Link determination unit 31. , replace the last delimiter and send.
  • the process of transmitting the Quick Reserve Single Radio Control Frame is controlled by the Single Radio control unit 56. It is then executed by the data transmission block.
  • the transmission data is constructed as a Control Frame by the Single Radio MAC processing unit 53, converted to a baseband signal by the Single Radio PHY transmission unit 54, and converted to a baseband signal by the Single Radio RF signal processing unit 55. It is high-frequency processed and transmitted from an antenna.
  • the process of receiving the A-MPDU frame is executed by the data reception block under the control of the Single Radio control unit 56.
  • the waveform of the received data part of the signal received by the antenna is detected by the Single Radio RF signal detection unit 69, and the baseband signal extracted from the detected waveform is detected as a predetermined A-MPDU frame in the Single Radio channel.
  • the reception process is executed by the Single Radio PHY reception unit 68. Thereafter, the Single Radio MAC determination unit 67 analyzes the delimiter information and separates the MPDU portion.
  • the Useful Single Radio Link information is supplied to the Single Radio control unit 56.
  • control is performed as necessary to determine the link for transmitting the Quick Reserve Single Radio Control Frame.
  • FIG. 35 is a diagram illustrating a configuration example of a Quick Reserve Single Radio Control Frame according to the fourth embodiment of the present technology.
  • the Quick Reserve Single Radio Control Frame in Figure 35 is configured to include Frame Control, Reserve Duration, RA, TA, Open Duration, Multi-Link Parameter, and FCS.
  • Frame Control is information indicating the type and format of the frame.
  • Reserve Duration is information indicating the maximum available time for this link.
  • RA is identification information that identifies the receiving device.
  • TA is identification information that identifies the sending device.
  • Open Duration is information that indicates the valid period of the usage opportunity, which is the period until it is determined that the link is open without using it.
  • Multi-Link Parameter is a parameter required for Multi-Link operation.
  • FCS is a frame check sequence for error detection.
  • Quick Reserve Single Radio Control Frame Frame Control to TA are the basic parameters, and Open Duration and Multi-Link Parameter are included in Quick Reserve Single Radio Control Frame as necessary. Additionally, the Quick Reserve Single Radio Control Frame may include other parameters.
  • identification information that identifies the RA and TA of this control frame is basically written in RA and TA, but identification information that identifies the RA and TA of the data frame to be transmitted next is written. You can do it like this. Also, the RA and TA identification information of this control frame is written in RA and TA, and the RA and TA identification information of the next transmitted data frame is written in Multi-Link Parameter. You may also do so.
  • the Multi-Link Parameter contains the identification information of the RA and TA of the frame to be transmitted next. Information indicating whether the transmission direction is the same as that of the TA or the opposite transmission direction may be written. Further, in the Multi-Link Parameter, for example, the identification information of the RA and TA of the frame to be transmitted next may be written as is. The description method is not particularly limited.
  • FIG. 36 is a diagram showing a configuration example of the Open Reserve Single Radio Control Frame.
  • the configuration of the Open Reserve Single Radio Control Frame in Figure 36 differs from the Quick Reserve Single Radio Control Frame configuration in Figure 35 only in that Reserve Duration is replaced with Null Duration and Open Duration is replaced with Reserved, and in other points. are basically the same.
  • Null Duration is information indicating that this link is in an open state.
  • Reserved is an area reserved for the future.
  • FIG. 37 is a diagram illustrating a configuration example of a frame according to the fourth embodiment of the present technology.
  • the frame in FIG. 37 is a frame configured as an action frame or a management frame indicating that it corresponds to the operation of transmitting a Quick Reserve Control Frame in order to secure a usage opportunity in advance.
  • the EML Operation Mode Notification Frame in FIG. 37 differs from the frame in FIG. 8 in the configuration of the EML Control Field.
  • This EML Control Field consists of EMLSR Mode bit (0th bit), EMLMR Mode bit (1st bit), EMLSR Link Bitmap bit (2nd bit to 17th bit), Quick Reserve Single Radio bit (18th bit), Quick It is configured to include Reserve Single Radio Information bits (19th to 22nd bits) and Single Radio BA bit (23rd bit).
  • the Quick Reserve Single Radio bit is a bit that indicates whether or not the Quick Reserve Control Frame, which secures usage opportunities in advance, can be transmitted.
  • the Quick Reserve Single Radio Information bit is information indicating the link (Radio) to be transmitted.
  • FIG. 38 is a diagram showing a fourth configuration example of the Single Radio Block ACK Frame.
  • the Single Radio Block ACK Frame in Figure 38 differs from the Single Radio Block ACK Frame in Figure 9 in the configuration of the BA Control Field.
  • BA Control Field consists of BA ACK Policy bit (0th bit), BA Type bit (1st bit to 4th bit), Quick Reserve Single Radio Information bit (5th bit to 8th bit), Reserved bit (9th bit (11th bit to 11th bit) and TID_INFO bit (12th bit to 15th bit).
  • the Available Single Link bit is information that specifies the link that transmits the Quick Reserve Single Radio Control Frame.
  • the Single Radio Block ACK Frame in Figure 38 maintains the conventional Block ACK Frame format, but uses the 5th to 8th bits, which were reserved bits in the BA Control field, as Quick Reserve Single Radio Information bits. , Control Frame is configured so that you can specify the link to send.
  • FIG. 39 is a diagram illustrating a configuration example of an A-MPDU frame according to the fourth embodiment of the present technology.
  • the A-MPDU frame in Figure 39 like the A-MPDU frame in Figure 20, alternately aggregates a delimiter that indicates the frame boundary and a MAC Protocol Data Unit (MPDU) that contains the actual data. It is constructed by adding Padding to the end.
  • MPDU MAC Protocol Data Unit
  • the A-MPDU frame in FIG. 39 differs in the configuration of the delimiter (Changed Delimiter in the figure) applied to the last MPDU.
  • the delimiters from the beginning to the last one are the EOF bit (0th bit), Reserved bit (1st bit), MPDU Length bit (2nd bit to 14th bit), and CRC bit ( 16th bit to 23rd bit) and Delimiter Signature bits (24th bit to 31st bit).
  • Changed Delimiter includes EOF bit (0th bit), Changed Signature bit (1st bit), MPDU Length bit (2nd bit to 14th bit), CRC bit (16th bit to 23rd bit), Useful Single Radio Link It is configured to include Information bits (24th bit to 27th bit) and Info CRC (28th bit to 31st bit).
  • the Changed Signature bit is information indicating that Useful Single Radio Link Information is included in the portion of the Changed Delimiter that corresponds to the Delimiter Signature of the conventional Delimiter.
  • the Useful Single Radio Link Information bit is information that notifies information about available links.
  • the EMLSR STA that received the data can understand that the additional information, Useful Single Radio Link Information, is included in the last Delimiter Signature part, because this Changed Signature field is set to 1.
  • FIG. 39 shows an example in which the last delimiter includes the Useful Single Radio Link Information bit
  • the Useful Single Radio Link Information bit may be included in other delimiters.
  • FIGS. 40 and 41 are flowcharts illustrating data transmission processing of a communication device (AP) on the data transmission side in the fourth embodiment of the present technology.
  • step S211 the data construction unit 22 receives transmission data addressed to EMLSR STA from the device control module 13 via the Data Buffer 21.
  • step S212 the Multi-Link control unit 23 performs detection settings to understand the usage status of Single Rasio STA in Pre-Configure Link.
  • the Multi-Link control unit 23 identifies the duration that can be transmitted on the current link based on the status of transmission opportunity (TXOP) on the current link, and constructs an A-MPDU frame. Calculate the parameter information of.
  • the parameter information includes the number of A-MPDUs that can be aggregated.
  • step S214 the data construction unit 22 acquires the length information of each MPDU.
  • step S215 the data construction unit 22 constructs delimiter information based on the acquired Length information.
  • step S216 the data construction unit 22 determines whether the MPDU currently being processed is the last MPDU constituting the A-MPDU. If it is determined in step S216 that this is the last MPDU constituting the A-MPDU, the process proceeds to step S217.
  • step S217 the data construction unit 22 determines whether to add Usage Single Radio Link (USRL) information. If it is determined in step S217 that Usage Single Radio Link information is not added, the process proceeds to step S218.
  • USRL Usage Single Radio Link
  • step S216 If it is determined in step S216 that this is not the last MPDU constituting the A-MPDU, the process also proceeds to step S218.
  • step S2128 the data construction unit 22 constructs MPDU information.
  • step S219 the Multi-Link control unit 23 causes the first or second transmission block to sequentially perform a transmission process using the MPDU constructed by the data construction unit 22 as a subframe of an A-MPDU.
  • step S220 the Multi-Link control unit 23 determines whether the end of the A-MPDU frame has been transmitted. If it is determined in step S220 that the end of the A-MPDU frame has been transmitted, the process ends.
  • step S220 If it is determined in step S220 that the end of the A-MPDU frame has not been transmitted, the process returns to step S214, and the subsequent processes are repeated.
  • step S217 If it is determined in step S217 that Usage Single Radio Link information is to be added, the process proceeds to step S221 in FIG. 41.
  • step S221 the Pre-Configure Link determination unit 31 acquires its own Pre-Configure Link detection status.
  • step S222 the Pre-Configure Link determination unit 31 sets available links based on the strength of the noise level, etc., based on the detection status of its own Pre-Configure Link.
  • step S223 the Multi-Link control unit 23 determines whether Usage Single Radio Link (USRL) information can be added. If it is determined in step S223 that Usage Single Radio Link information can be added, the process proceeds to step S224.
  • USRL Usage Single Radio Link
  • step S224 the data construction unit 22 constructs Usage Single Radio Link information.
  • step S225 the data construction unit 22 replaces the delimiter using the constructed Usage Single Radio Link information. The process then proceeds to step S226.
  • step S223 If it is determined in step S223 that Usage Single Radio Link information cannot be added, steps S224 and S225 are skipped, and the process proceeds to step S226.
  • step S226 the data construction unit 22 constructs MPDU information.
  • step S227 the data construction unit 22 determines whether padding is necessary. If it is not aligned to 4 octets, it is determined in step S226 that padding is necessary, and the process proceeds to step S228.
  • step S228 the data construction unit 22 adds Padding to the end of the data. The process then proceeds to step S229.
  • step S227 If it is determined in step S227 that padding is not necessary, the process in step S228 is skipped, and the process proceeds to step S229.
  • step S229 the Multi-Link control unit 23 causes the first or second transmission block to sequentially perform a transmission process using the MPDU constructed by the data construction unit 22 as a subframe of the A-MPDU. After that, the data transmission process of the AP shown in FIGS. 40 and 41 ends.
  • ⁇ EMLSR STA processing> 42 and 43 are flowcharts illustrating data reception processing of the EMLSR STA in the fourth embodiment of the present technology.
  • step S241 the Single Radio control unit 56 of the EMLSR STA operates a link defined as a Pre-Configure Link by exchanging a predetermined action frame with the AP, for example, and sets the Single Radio reception operation. .
  • step S242 the Single Radio control unit 56 determines whether to start data reception.
  • step S242 the Single Radio control unit 56 waits until it starts receiving data. If the Single Radio control unit 56 transmits a CTS frame after receiving a control frame (RTS frame) using any Pre-Configure Link, it is determined in step S242 to start data reception, and the process proceeds to step S243. move on.
  • RTS frame control frame
  • step S243 the Single Radio control unit 56 receives the A-MPDU frame and acquires delimiter information.
  • step S244 the Single Radio control unit 56 performs A-MPDU reception processing using Single Radio.
  • step S245 the Single Radio control unit 56 determines whether it is the last MPDU each time it receives a subframe (MPDU) of A-MPDU. If it is determined in step S245 that it is not the last MPDU, the process returns to step S243, and the subsequent processes are repeated.
  • MPDU subframe
  • step S245 If it is determined in step S245 that it is the last MPDU, the process proceeds to step S246.
  • step S246 it is determined whether there is any unreached data. If it is determined in step S246 that there is no unreached data, the process proceeds to step S247.
  • step S247 the Single Radio control unit 56 acquires the received ACK sequence number (S/N) information.
  • step S248 the data construction unit 22 constructs a Block ACK frame based on the acquired received ACK sequence number information.
  • step S249 the data construction unit 22 transmits the constructed Block ACK frame.
  • step S250 the Single Radio control unit 56 determines whether to end the use of the transmission path. If it is determined in step S250 that the use of the transmission path has ended, the data reception processing of the EMLSR STA in FIGS. 42 to 44 ends.
  • step S246 determines whether there is no unreached data. If it is determined in step S246 that there is no unreached data, the process proceeds to step S251 in FIG. 43.
  • step S251 the Pre-Configure Link determination unit 64 acquires the usage status of the Pre-Configure Link.
  • step S252 the Pre-Configure Link determination unit 64 determines whether there is an available link based on the current reception field strength, noise level, etc. of the Pre-Configure Link. If it is determined in step S252 that there is an available link, the process proceeds to step S253.
  • step S253 the Single Radio control unit 56 selects a link that operates as Quick Reserve Single Radio.
  • step S254 the Single Radio control unit 56 determines whether to notify using BA (Block ACK). If it is determined in step S254 that notification is to be made using BA, the process proceeds to step S255.
  • step S255 the data construction unit 22 adds Quick Reserve Single Radio Link information to BA. After that, the process returns to step S247 in FIG. 42, and the subsequent processes are repeated.
  • step S252 If it is determined in step S252 that there is no available link, or if it is determined in step S254 that notification is not to be made using BA, the process returns to step S247 in FIG. 42 and the subsequent processes are repeated. It will be done.
  • step S250 determines whether the use of the transmission path is not to be ended. Furthermore, if it is determined in step S250 that the use of the transmission path is not to be ended, the process proceeds to step S256 in FIG. 44.
  • step S256 the Single Radio control unit 56 transitions to the link set as the Quick Reserve Single RadioLink.
  • step S257 the Single Radio control unit 56 transmits a Quick Reserve Single Radio Control Frame.
  • step S258 it is determined whether an A-MPDU frame is detected within the arrival time of a predetermined Open Duration. If it is determined in step S258 that the A-MPDU frame has been detected within the arrival time of the predetermined Open Duration, the process returns to step S243 in FIG. 42 and the subsequent processes are repeated.
  • step S258 If it is determined in step S258 that no A-MPDU frame has been detected within the arrival time of the predetermined Open Duration, the process proceeds to step S259.
  • step S259 the Single Radio control unit 56 transmits Open Reserve Single Radio Control Frame.
  • step S260 the Single Radio control unit 56 acquires the usage status of the Pre-Configure Link at that time and selects a newly available Quick Reserve Single Radio Link. After that, the process returns to step S256, and the subsequent processes are repeated.
  • a control frame (Quick Reserve Single Radio Control Frame) that secures a usage opportunity in advance is transmitted in the link that the EMLSR STA will use next.
  • control frame Quality Reserve Single Radio Control Frame
  • the control frame that secures usage opportunities includes information that can identify the own communication device and information that can identify the data transmission destination, ensuring the necessary usage opportunities. Contains information on how long to hold the file. Thereby, the necessary time for occupying the transmission path can be notified between the communication devices.
  • the Pre-Configure Link to be used by EMLSR STA is selected from the information sent by the data transmitting AP using A-MPDU frames, etc. that notifies the status of the link to be used by EMLSR STA. Thereby, a reliable link can be selected between communication devices that transmit and receive data.
  • the EMLSR STA can identify the link to which it will transition. I can do it.
  • both devices can share information on the link to be transitioned, it is possible to prevent another device from acquiring the opportunity to use the link during the time it takes to transition the link.
  • the transmission path can be used seamlessly during multilink operation.
  • the data transmission side device is an AP that performs Multi-Link Multi-Radio operation, but the data transmission side device performs Multi-Link Multi-Radio operation. It may be an STA, or an AP or STA that performs EMLSR operations.
  • the data receiving side device is an STA that performs EMLSR operation
  • the data receiving side device may be an AP that performs EMLSR operation, or a Multi-STA device that performs EMLSR operation. It may be an AP or STA that performs Link Multi-Radio operation.
  • FIG. 45 is a block diagram showing an example of the hardware configuration of a computer that executes the above-described series of processes using a program.
  • a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, and a RAM (Random Access Memory) 303 are interconnected by a bus 304.
  • An input/output interface 305 is further connected to the bus 304.
  • an input section 306 consisting of a keyboard, a mouse, etc.
  • an output section 307 consisting of a display, speakers, etc.
  • a storage section 308 made up of a hard disk, a nonvolatile memory, etc.
  • a communication section 309 made up of a network interface, etc.
  • a drive 310 that drives a removable medium 311 .
  • the CPU 301 for example, loads a program stored in the storage unit 308 into the RAM 303 via the input/output interface 305 and the bus 304 and executes it, thereby performing the series of processes described above. will be held.
  • a program executed by the CPU 301 is installed in the storage unit 308 by being recorded on a removable medium 311 or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital broadcasting.
  • the program executed by the computer may be a program in which processing is performed chronologically in accordance with the order described in this specification, in parallel, or at necessary timing such as when a call is made. It may also be a program that performs processing.
  • the wireless communication device 1 in FIG. 5 may be a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a digital camera, a television receiver, a printer, a digital scanner, or a network. It may be realized as a fixed terminal such as a storage device or an in-vehicle terminal such as a car navigation device. Furthermore, the wireless communication device 1 may be realized as an M2M (Machine To Machine Communication) terminal such as a smart meter, a vending machine, a remote monitoring device, or a POS (Point Of Sale) terminal. Furthermore, the wireless communication device 1 may be a wireless communication module (for example, an integrated circuit module composed of one die) mounted on these terminals.
  • a wireless communication module for example, an integrated circuit module composed of one die mounted on these terminals.
  • the wireless communication device 1 may be realized as a wireless LAN AP (wireless base station) that has a router function or does not have a router function. Furthermore, the wireless communication device 1 may be realized as a mobile wireless LAN router. Furthermore, the wireless communication device 1 may be a wireless communication module (for example, an integrated circuit module composed of one die) mounted on these devices.
  • a wireless LAN AP wireless base station
  • the wireless communication device 1 may be realized as a mobile wireless LAN router.
  • the wireless communication device 1 may be a wireless communication module (for example, an integrated circuit module composed of one die) mounted on these devices.
  • FIG. 46 is a block diagram illustrating a schematic configuration example of a smartphone to which the present technology is 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, and a display device 910.
  • the smartphone 900 also includes 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.
  • the processor 901 may be, for example, a CPU or a SoC (System on Chip), and limits the functions of the application layer and other layers of the smartphone 900.
  • SoC System on Chip
  • Memory 902 includes RAM and ROM, and stores programs and data executed by processor 901.
  • the storage 903 includes 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.
  • an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
  • USB Universal Serial Bus
  • the camera 906 has an imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
  • an imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
  • the sensor 907 includes a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
  • a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
  • the microphone 908 converts the audio 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, a switch, etc., and receives operations or information input from the user.
  • the display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and converts the audio signal output from the smartphone 900 into audio.
  • LCD liquid crystal display
  • OLED organic light emitting diode
  • the wireless communication interface 913 supports one or more of wireless LAN standards such as IEEE802.11a, 11b, 11g, 11ac, and 11ad, and performs wireless communication.
  • the wireless communication interface 913 communicates with other devices via a wireless LAN AP. Furthermore, the wireless communication interface 913 directly communicates with other devices in an ad hoc mode or a direct communication mode such as Wi-Fi Direct.
  • Wi-Fi Direct unlike ad hoc mode, one of the two terminals operates as an AP, but communication is performed directly between the two terminals.
  • the wireless communication interface 913 typically includes 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 that integrates a memory that stores a communication control program, a processor that executes the program, and related circuits.
  • the wireless communication interface 913 may support other types of wireless communication methods such as a short-range wireless communication method, a close proximity wireless communication method, or a cellular communication method.
  • the antenna switch 914 switches the connection destination of the antenna 915 between a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 913.
  • the antenna 915 has a single antenna element or multiple antenna elements (for example, multiple antenna elements forming a MIMO (Multiple Input Multiple Output) antenna), and is used for transmitting and receiving wireless signals by the wireless communication interface 913. be done.
  • MIMO Multiple Input Multiple Output
  • the smartphone 900 is not limited to the example in FIG. 46, and may include a plurality of antennas (for example, a wireless LAN antenna, a close proximity wireless communication antenna, etc.). In that case, antenna switch 914 may be omitted from the configuration of smartphone 900.
  • antenna switch 914 may be omitted from the configuration of smartphone 900.
  • Bus 917 connects 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. do.
  • the battery 918 supplies power to each block of the smartphone 900 shown in FIG. 46 via power supply lines partially indicated by broken lines in the figure.
  • the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in sleep mode.
  • the wireless communication module 15 described above with reference to FIG. 6 or 7 may be implemented in the wireless communication interface 913. Also, at least some of these functions may be implemented in processor 901 or auxiliary controller 919.
  • the smartphone 900 may operate as a wireless AP (software AP) by the processor 901 executing the AP function at the application level.
  • the wireless communication interface 913 may have a wireless AP function.
  • the smartphone 900 may include a biometric authentication section (fingerprint authentication, palm shape authentication, voice authentication, blood vessel authentication, face authentication, iris authentication, retina authentication).
  • a biometric authentication section fingerprint authentication, palm shape authentication, voice authentication, blood vessel authentication, face authentication, iris authentication, retina authentication.
  • the smartphone 900 information is displayed from at least one of the display device 910 and the speaker 911 based on communication with an external device through the wireless communication interface 913.
  • the result of synchronization according to the present technology may be output as information from at least either the display device 910 or the speaker 911.
  • FIG. 47 is a block diagram illustrating an example of a schematic configuration of an in-vehicle device 920 to which the present technology is applied.
  • the in-vehicle device 920 is configured to include a processor 921, a memory 922, a GNSS (Global Navigation Satellite System) module 924, a sensor 925, a data interface 926, a content player 927, and a storage medium interface 928.
  • In-vehicle device 920 is also configured to include an input device 929, a display device 930, a speaker 931, a wireless communication interface 933, an antenna switch 934, an antenna 935, and a battery 938.
  • GNSS Global Navigation Satellite System
  • the processor 921 may be, for example, a CPU or an SoC, and controls the navigation function and other functions of the in-vehicle device 920. Furthermore, the processor 921 can also control the drive system of the vehicle, such as the brake, accelerator, or steering, based on information obtained through communication based on the present technology.
  • Memory 922 includes RAM and ROM, and stores programs and data executed by processor 921.
  • the GNSS module 924 measures the position (eg, latitude, longitude, and altitude) of the on-vehicle device 920 using GNSS signals received from GNSS satellites.
  • the sensor 925 includes a group of sensors 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 via a terminal (not shown), for example, and acquires data generated on the vehicle side, such as in-vehicle data.
  • Content player 927 plays content stored on a storage medium (eg, CD or DVD) inserted into storage medium interface 928.
  • a storage medium eg, CD or DVD
  • the input device 929 includes, for example, a touch sensor that detects a touch on the screen of the display device 930, a button, or a switch, and receives operations or information input from the user.
  • the display device 930 has a screen such as an LCD or OLED display, and displays navigation functions or images of the content to be played.
  • the speaker 931 outputs the navigation function or the audio of the content to be played.
  • the navigation function and the function provided by the content player 927 are optional.
  • the navigation function and content player 927 may be removed from the configuration of the in-vehicle device 920.
  • the wireless communication interface 933 supports one or more of wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and performs wireless communication. In the infrastructure mode, the wireless communication interface 933 communicates with other devices via a wireless LAN AP. Furthermore, the wireless communication interface 933 directly communicates with other devices in an ad hoc mode or a direct communication mode such as Wi-Fi Direct.
  • wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad
  • the wireless communication interface 933 typically includes a baseband processor, an RF circuit, a power amplifier, and the like.
  • the wireless communication interface 933 may be a one-chip module that integrates a memory that stores a communication control program, a processor that executes the program, or related circuits.
  • the wireless communication interface 933 may support other types of wireless communication systems, such as short-range wireless communication systems, close proximity wireless communication systems, or cellular communication systems.
  • the antenna switch 934 switches the connection destination of the antenna 935 between a plurality of circuits included in the wireless communication interface 933.
  • the antenna 935 has a single or multiple antenna elements and is used for transmitting and receiving wireless signals by the wireless communication interface 933.
  • the in-vehicle device 920 is not limited to the example shown in FIG. 47, and may include a plurality of antennas 935. In that case, the antenna switch 934 may be omitted from the configuration of the in-vehicle device 920.
  • the battery 938 is connected to the wireless communication module 15 described above with reference to FIG. 6 or 7 in the vehicle-mounted device 920 shown in FIG. It may be implemented in interface 933. Further, at least some of these functions may be implemented in the processor 921.
  • the wireless communication interface 933 may operate as the above-described wireless communication device 1 and provide wireless connection to a terminal owned by a user riding in a vehicle.
  • the present technology may be realized as an in-vehicle system (or vehicle) 940 that includes one or more blocks of the above-described in-vehicle device 920, an in-vehicle network 941, and a vehicle-side module 942.
  • the 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. 48 is a block diagram illustrating an example of a schematic configuration of a wireless AP 950 to which the present technology is applied.
  • the wireless AP 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, for example, a CPU or a DSP (Digital Signal Processor), and controls various functions of the IP (Internet Protocol) layer and higher layers of the wireless AP 950 (for example, access restriction, routing, encryption, firewall, and log management).
  • IP Internet Protocol
  • Memory 952 includes RAM and ROM, and stores programs executed by controller 951 and various control data (eg, terminal list, routing table, encryption key, security settings, log, etc.).
  • various control data eg, terminal list, routing table, encryption key, security settings, log, etc.
  • the input device 954 includes, for example, buttons and switches, and accepts operations from the user.
  • the display device 955 includes an LED lamp and the like, and displays the operational status of the wireless AP 950.
  • the network interface 957 is a wired communication interface for connecting the wireless AP 950 to the wired communication network 958.
  • Network interface 957 may have multiple connection terminals.
  • the wired communication network 958 may be a LAN such as Ethernet (registered trademark), or a WAN (Wide Area Network).
  • the wireless communication interface 963 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and provides wireless connectivity as an AP to nearby terminals.
  • wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad
  • the wireless communication interface 963 typically includes a baseband processor, an RF circuit, a power amplifier, and the like.
  • the wireless communication interface 963 may be a one-chip module that integrates a memory that stores a communication control program, a processor that executes the program, or related circuits.
  • the antenna switch 964 switches the connection destination of the antenna 965 between a plurality of circuits included in the wireless communication interface 963. Used for sending and receiving.
  • the wireless communication module 15 described above with reference to FIG. 6 or 7 may also be implemented in the wireless communication interface 963. Further, at least some of these functions may be implemented in the controller 951.
  • processing procedure described in the above embodiment may be regarded as a method having a series of these procedures, and a program for causing this computer to execute this series of procedures or a recording medium that stores the program. It may be taken as
  • a CD Compact Disc
  • MD MiniDisc
  • DVD Digital Versatile Disc
  • memory card Blu-ray Disc (Blu-ray (registered trademark) Disc), etc.
  • Blu-ray Disc Blu-ray (registered trademark) Disc
  • a system refers to a collection of multiple components (devices, modules (components), etc.), regardless of whether all the components are located in the same casing. Therefore, multiple devices housed in separate casings and connected via a network, and a single device with multiple modules housed in one casing are both systems. .
  • the present technology can take a cloud computing configuration in which one function is shared and jointly processed by multiple devices via a network.
  • each step described in the above flowchart can be executed by one device or can be shared and executed by multiple devices.
  • one step includes multiple processes
  • the multiple processes included in that one step can be executed by one device or can be shared and executed by multiple devices.
  • the present technology can also have the following configuration.
  • Control is performed to receive first information from the wireless communication device via one of a plurality of links preset between the wireless communication device and the plurality of information included in any frame. Obtain first available link information indicating a link that can be used for communication after receiving the first information of the links, and select a link for communication based on the first available link information.
  • a wireless communication control device including a communication control unit for specifying. (2) further comprising a link usage status detection unit that detects usage status of the plurality of links, The communication control unit specifies a link to be used for communication performed after receiving the first information, based on the detected usage status of the plurality of links and the first available link information. ).
  • the communication control unit generates second available link information indicating its own available links based on the detected usage status of the plurality of links and the first available link information. (2) ).
  • the wireless communication control device according to (3), wherein the communication control unit controls including the second available link information in a control frame and transmitting the control frame to the wireless communication device.
  • the communication control unit is configured such that the first information is a data frame;
  • the wireless communication control according to (3) above, wherein the communication control unit performs control to include the second available link information in a reception confirmation response frame corresponding to the data frame and transmit it to the wireless communication device. Device.
  • the first information includes an MPDU (MAC Protocol Data Unit), The radio communication control device according to any one of (1) to (5), wherein the first available link information is received after the last transmitted MPDU among the MPDUs included in the first information. . (7) The radio communication control device according to (6), wherein the first available link information is included in padding whose length is adjusted in the data frame. (8) The first information includes a first MPDU and a second MPDU, The radio communication control device according to (6), wherein information indicating that the first available link information is included is received between the first MPDU and the second MPDU.
  • MPDU MAC Protocol Data Unit
  • the first information includes a first MPDU and a second MPDU received after the first MPDU, The wireless communication control device according to any one of (1) to (5), wherein the first available link information is received between the first MPDU and the second MPDU. (10) The wireless communication control device according to (9), wherein the second MPDU is the last MPDU received among the first information. (11) The radio communication control device according to any one of (1) to (5), wherein the first available link information is included in a MAC header of the first information. (12) The radio communication control device according to (11), wherein the first available link information is included in the A-Control field of the MAC header. (13) The first available link information is included in the first information and is received after a Control field that is transmitted after a Duration field. Communication control device.
  • the wireless communication control device according to any one of (1) to (13), wherein the first available link information includes information indicating a plurality of the available links.
  • the wireless communication control device according to any one of (1) to (14), wherein the first available link information is included in the first information when the wireless communication device has transmission data.
  • the communication control unit receives information regarding the transmission capability of the first available link information of the wireless communication device prior to receiving the first information, according to any one of (1) to (15) above. wireless communication control device.
  • the wireless communication control device according to any one of (1) to (16), further comprising a communication unit that waits for a data frame received after receiving the first information using the specified link.
  • the wireless communication control device according to any one of (1) to (17), wherein the wireless communication control device is a device that performs an operation compatible with EMLSR (Extended Multi-Link Single Radio).
  • the wireless communication control device Control is performed to receive first information from the wireless communication device via one of a plurality of links preset between the wireless communication device and the plurality of information included in any frame. Obtain first available link information indicating a link that can be used for communication after receiving the first information of the links, and select a link for communication based on the first available link information. Identify wireless communication control method.
  • Control is performed to receive first information from the wireless communication device via one of a plurality of links preset between the wireless communication device and the plurality of information included in any frame. Obtain first available link information indicating a link that can be used for communication after receiving the first information of the links, and select a link for communication based on the first available link information.
  • 1 Wireless communication device 11 Internet connection module, 12 Information input module, 13 Equipment control module, 14 Information output module, 15 Wireless communication module, 21 Data Buffer, 22 Data construction unit, 23 Multi-Link control unit, 24 Multi-Link MAC processing unit, 25 Multi-Link PHY processing unit, 26 Multi-Link RF signal processing unit, 27 Multi-Link RF detection unit, 28 Multi-Link PHY reception unit, 29 Multi-Link MAC determination unit, 30 Data processing unit, 31 Pre-Configure Link judgment unit, 51 Data Buffer, 52 Single Radio data processing unit, 53 Single Radio MAC processing unit, 54 Single Radio PHY signal processing unit, 55 Single Radio RF signal processing unit, 56 Single Radio control Part, 57 Single Radio MAC judgment section, 58 Single Radio PHY reception section, 59 Single Radio RF detection section

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente technologie concerne un dispositif et un procédé de commande de communication sans fil, et un programme, qui permettent de mettre en œuvre une transmission de données de manière plus fiable. Un dispositif de commande de communication sans fil selon la présente invention met en œuvre une commande pour recevoir des premières informations en provenance d'un dispositif de communication sans fil par l'intermédiaire d'une liaison parmi une pluralité de liaisons prédéfinies avec le dispositif de communication sans fil, acquiert des premières informations de liaisons disponibles qui sont incluses dans une trame arbitraire et indiquent une liaison, parmi la pluralité de liaisons, qui est disponible pour une communication à mettre en œuvre après la réception des premières informations, et, sur la base des premières informations de liaisons disponibles, identifie une liaison pour mettre en œuvre une communication. La présente technologie peut être appliquée à des systèmes de communication sans fil.
PCT/JP2023/016041 2022-05-11 2023-04-24 Dispositif et procédé de commande de communication sans fil, et programme WO2023218918A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018520608A (ja) * 2015-07-16 2018-07-26 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． 指示情報を搬送するデータを伝送するための方法、装置およびシステム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018520608A (ja) * 2015-07-16 2018-07-26 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． 指示情報を搬送するデータを伝送するための方法、装置およびシステム

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