WO2019208451A1 - 通信装置及び通信方法 - Google Patents
通信装置及び通信方法 Download PDFInfo
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- WO2019208451A1 WO2019208451A1 PCT/JP2019/016885 JP2019016885W WO2019208451A1 WO 2019208451 A1 WO2019208451 A1 WO 2019208451A1 JP 2019016885 W JP2019016885 W JP 2019016885W WO 2019208451 A1 WO2019208451 A1 WO 2019208451A1
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- bft
- mimo
- responder
- initiator
- brp
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
Definitions
- the present disclosure relates to a communication device and a communication method.
- Standardization of the IEEE802.11ay standard has been performed as a method for realizing high-speed data transmission by applying the MIMO method to millimeter wave communication (see Non-Patent Documents 2, 3, and 4).
- Non-Patent Document 1 It is required to shorten the time for executing beamforming training (BFT) of the 802.11ad standard (see Non-Patent Document 1).
- the initiator determines whether to perform SU-MIMO (Single-User-Multi-Input-Multi-Output) BFT (Beam Forming Training) after the end of TXSS (Transmission Sector Sweep).
- a first feedback frame including a BF training type FIELD indicating to the responder, the responder receiving the first feedback frame, indicating that the BF training type FIELD performs the BFT of the SU-MIMO;
- a second feedback including an SNR (Signal to Noise Ratio) and a sector ID (Identifier) order is transmitted to the initiator, and the initiator receives the second feedback and receives the second SNR.
- the SU-MIMO BFT is executed with the responder.
- a feedback frame including BF training type FIELD indicating whether or not to perform SU-MIMO BFT is transmitted to the responder, and the responder transmits the TXSS.
- the SU-MIMO BFT is performed with the responder based on the SNR and the sector ID order.
- the responder communication method After TXSS (transmission sector sweep) is completed, whether or not to perform SU-MIMO (Single-User-Multi-Input-Multi-Output) BFT (beamforming training) is indicated.
- SU-MIMO Single-User-Multi-Input-Multi-Output
- the SNR Signal to Noise Ratio
- a sector ID Identifier
- FIG. The figure which shows an example of a structure of the MIMO communication system which concerns on Embodiment 1.
- FIG. The figure which shows an example of a structure of a communication apparatus
- the figure which shows an example of a structure of a communication apparatus The figure which shows an example of the BFT procedure of 802.11ad standard Diagram showing the SISOSIBRP TXSS procedure of the 802.11ay draft standard Diagram showing an example of the SU-MIMO BFT procedure of the 802.11ay draft standard Diagram showing an example of the SU-MIMO BFT procedure of the 802.11ay draft standard Diagram showing an example of the 802.11ay draft standard MU-MIMO BFT procedure Diagram showing an example of the 802.11ay draft standard MU-MIMO BFT procedure
- FIG.3 The figure which shows the format of the BRP frame transmitted first, when a communication apparatus performs the BFT procedure of FIG.3, FIG.4, FIG.5, FIG.6, FIG.7, FIG.
- FIG. 10A-FIG The figure which shows the format of the BRP frame transmitted first, when a communication apparatus performs the BFT procedure of FIG.3, FIG.4, FIG.5, FIG.6, FIG.7, FIG. A flowchart showing a procedure for discriminating the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives a BRP frame.
- Diagram showing types of SISO BFT that can be used in combination with SISO Feedback procedure of SU-MIMO BFT by using the BRP frame of FIG. 10A to FIG. 10D and FIG. 11 as the first BRP frame of each procedure by the initiator The figure which shows the detail of the procedure in case a communication apparatus performs SU-MIMO BFT of FIG. 6 using the BRP frame shown to FIG. 10A-FIG.
- FIG. 10D and FIG. Diagram showing common Feedback BRP frame format The figure which shows the format of the BRP frame of Embodiment 2.
- Diagram showing the procedure for the initiator and responder to perform SISO BRP TXSS and SU-MIMO BFT using the BRP frame shown in FIG. 16 is a flowchart showing a procedure for determining the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives the BRP frame of FIG.
- FIG. 16 of a BRP frame 19 is a flowchart showing a procedure for determining the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives the BRP frame of FIG.
- FIG. 1 is a diagram illustrating an example of a configuration of a MIMO communication system according to the present embodiment.
- Each of the communication device 100, the communication device 200, and the communication device 300 includes one or more antenna arrays.
- Each antenna array includes one or more antenna elements.
- the communication device 100 includes, for example, two antenna arrays 101a and 101b, and performs SISO (Single Input Single Output) communication with the communication device 200 and the communication device 300 using any one of the antenna arrays (for example, the antenna array 101a).
- SISO Single Input Single Output
- the communication device 100 performs SU-MIMO (Single-User Multi-Input Multi-Output) communication with the communication device 200 and the communication device 300 using a plurality of antenna arrays (for example, the antenna arrays 101a and 101b).
- SU-MIMO Single-User Multi-Input Multi-Output
- the communication device 100 performs MU-MIMO (Multi-User-MIMO) communication with the communication device 200 and the communication device 300 using a plurality of antenna arrays (for example, the antenna arrays 101a and 101b).
- MU-MIMO Multi-User-MIMO
- communication is performed with one communication device (for example, either communication device 200 or communication device 300) at the same time (one transmission frame), whereas in MU-MIMO, the same time (one transmission frame).
- a frame communicates with a plurality of communication devices (for example, each of the communication device 200 and the communication device 300).
- FIG. 2A is a diagram illustrating an example of the configuration of the communication device 100.
- the communication apparatus 100 includes a host 130, a MAC circuit 120, a PHY circuit 110, and an RF module circuit 109.
- the RF module circuit 109 includes antenna arrays 101a and 101b, switch circuits (SW) 102a and 102b, transmission RF (Radio frequency) circuits 103a and 103b, and reception RF circuits 104a and 104b.
- the transmission RF (RadioRad Frequency) circuits 103a and 103b and the reception RF circuits 104a and 104b may be called a transmission high-frequency circuit and a reception high-frequency circuit.
- the antenna arrays 101a and 101b transmit and receive radio signals.
- the switch circuits 102a and 102b switch the connection destination of the antenna arrays 101a and 101b.
- the switch circuits 102a and 102b connect to the transmission RF circuits 103a and 103b.
- the reception RF circuits 104a and 104b When the operation mode is reception, the reception RF circuits 104a and 104b. This is a circuit for making the antenna arrays 101a and 101b correspond to transmission and reception by connecting to.
- the communication apparatus 100 includes a transmission antenna array (for example, 101a-1 and 101a-2 not shown) and a reception antenna array (for example, 102a-1 and 102a-2 not shown) instead of including the switch circuits 102a and 102b. May be provided.
- the transmission RF circuits 103a and 103b modulate the transmission baseband signals output from the D / A converters 111a and 111b, convert them to high frequencies (for example, 60 GHz band signals), and output them to the antenna arrays 101a and 101b.
- the transmission RF circuits 103a and 103b control the transmission directivity of the antenna arrays 101a and 101b by controlling the phase and / or output of the output signal for each antenna element (not shown) constituting the antenna arrays 101a and 101b. I do.
- the transmission directivity control is to control the transmission intensity of the radio signal according to the transmission direction.
- the reception RF circuits 104a and 104b convert the reception radio signals output from the antenna arrays 101a and 101b into reception baseband signals and output them to the A / D converters 112a and 112b.
- the reception RF circuits 104a and 104b control the reception directivity of the antenna arrays 101a and 101b by controlling the phase and / or output of the input signal for each antenna element (not shown) constituting the antenna arrays 101a and 101b. I do.
- the reception directivity control is to control the reception sensitivity of a radio signal according to the reception direction.
- the PHY circuit 110 includes D / A converters 111a and 111b, A / D converters 112a and 112b, an encoding / modulation circuit 114, and a demodulation / decoding circuit 115.
- the D / A converters 111a and 111b perform digital / analog conversion on the transmission digital baseband signal output from the encoding / modulation circuit 114 and output it to the transmission RF circuits 103a and 103b.
- the A / D converters 112a and 112b perform analog / digital conversion on the reception analog baseband signals output from the reception RF circuits 104a and 104b, and output them to the demodulation / decoding circuit 115.
- the array control circuit 113 instructs the transmission RF circuits 103a and 103b and the reception RF circuits 104a and 104b to perform transmission directivity control and reception directivity control based on an instruction from the BF control circuit 124 of the MAC circuit 120.
- the encoding / modulation circuit 114 encodes (for example, LDPC: Low Density Parity Check encoding) and modulation (for example, ⁇ /) of a transmission MAC frame (referred to as a transmission PHY payload) output from the frame generation circuit 122 of the MAC circuit 120.
- 2-BPSK Binary Phase Shift Keying
- a transmission digital baseband signal is generated and output to the D / A converters 111a and 111b.
- the demodulation / decoding circuit 115 demodulates and decodes the received digital baseband signal output from the A / D converters 112 a and 112 b and outputs the decoded PHY data (referred to as a received MAC frame) to the frame receiving circuit 123 of the MAC circuit 120. To do.
- Demodulation processing performed by the demodulation / decoding circuit 115 includes, for example, synchronization processing (preamble detection, frequency synchronization, timing synchronization), equalization (correcting received signal distortion), data demodulation (for example, a symbol of ⁇ / 2-BPSK) Data to bit data and likelihood data).
- the decoding process includes, for example, LDPC decoding.
- the MAC circuit 120 includes, as an example, an access control circuit 121, a frame generation circuit 122, a frame reception circuit 123, and a BF (beam forming) control circuit 124.
- the access control circuit 121 switches between the transmission mode and the reception mode and determines the transmission timing in accordance with the user data input from the host 130 and the received data, and the frame generation circuit 122, the frame reception circuit 123, and the BF
- the control circuit 124 is controlled. Further, in order to transmit user data input from the host 130, the transmission timing is determined and the frame generation circuit 122 is controlled. Further, in order to perform beamforming training (BFT), the BFT execution timing is determined and the BF control circuit 124 is controlled.
- BFT beamforming training
- the host 130 includes, for example, a CPU (Central Processing Unit) or an SoC (System on Chip), and executes an OS (Operating System) or application software (for example, a web browser or file management software).
- OS Operating System
- application software for example, a web browser or file management software.
- the MAC circuit is started, stopped, status information acquisition control, data transmission request, and reception data acquisition, for example.
- FIG. 2B is a diagram illustrating an example of the configuration of the communication device 100a. Another example different from the communication apparatus 100 is shown. As an example, the communication device 100a includes a host 130, a MAC circuit 120, a PHY circuit 110a, and an RF module circuit 109a.
- the PHY circuit 110a includes an IF (Intermediate Frequency) transfer circuit 152.
- the IF transfer circuit 152 modulates the analog baseband signal (referred to as IQ signal) output from the D / A converters 111a and 111b to an intermediate frequency between a transmission baseband signal called a transmission IF (Intermediate Frequency) band signal and an RF signal. Then, the data is transferred to the RF module circuit via the IF cable 153.
- the IF transfer circuit 152 may modulate the control signal output from the array control circuit 113 into an IF band control signal, multiplex it with the transmission IF band signal, and output the multiplexed signal to the IF cable 153.
- the RF module circuit 109a includes an IF transfer circuit 151. Also, instead of the transmission RF circuits 103a and 103b and the reception RF circuits 104a and 104b in FIG. 2A, transmission RF circuits 103c and 103d and reception RF circuits 104c and 104d are provided.
- the IF transfer circuit 151 separates the IF band control signal from the IF cable 153, demodulates the control signal output by the array control circuit 113, and outputs the demodulated signal to the transmission RF circuits 103c and 103d and the reception RF circuits 104c and 104d.
- the IF transfer circuit 151 separates the transmission IF band signal and outputs it to the transmission RF circuits 103c and 103d.
- the transmission RF circuits 103c and 103d modulate and amplify the transmission IF band signal into a transmission RF signal. Further, based on the signal obtained by demodulating the IF band control signal by the IF transfer circuit 151, the amplitude and phase of the transmission RF signal are controlled to control the transmission directivity.
- the reception RF circuits 104a and 104b demodulate the reception RF signal into a reception baseband signal.
- the reception RF circuits 104c and 104d demodulate the reception RF signal into a reception IF band signal.
- IF transfer circuit 151 multiplexes the received IF band signal with other signals and outputs the multiplexed signal to IF cable 153.
- the IF transfer circuit 152 demodulates the reception IF band signal, generates a reception baseband signal, and outputs it to the A / D converters 112a and 112b.
- FIG. 2B multiplexes and transmits a plurality of signals to the IF cable 153 as compared with FIG. 2A, so that the IF cable 153 can be extended, and the PHY circuit 110a, the MAC circuit 120, and the RF module circuit 109a are Can be installed remotely.
- signals transmitted through the IF cable 153 are designed according to the configurations of the PHY circuit 110a and the RF module circuit 109a. Even if they are spaced apart, they are considered to have an integral function.
- FIG. 3 is a diagram showing an example of the BFT procedure of the 802.11ad standard.
- the BFT includes at least one of SLS (Sector Level Sweep) and BRP (Beam Refinement Protocol).
- the communication apparatus switches the directivity of the transmission antenna (transmission sector or transmission AWV: Antenna Weight Vector) or the reception antenna directivity (reception sector or reception AWV) for each packet, and BFT.
- transmission AWV Antenna Weight Vector
- reception antenna directivity reception sector or reception AWV
- BRP a communication apparatus performs BFT by switching between a transmission sector and a reception sector in a training field in a packet.
- BFT is performed by transmitting the response frame including information on the best transmission sector (referred to as the best sector) obtained by training.
- a communication device that starts BFT is called an initiator.
- a communication device that responds to a request from the initiator is called a responder.
- the initiator first performs an initiator transmission sector sweep (Initiator TXSS).
- the initiator switches the transmission sector for each sector sweep (Sector Sweep, SSW) frame 511, 512, 513 and transmits each SSW.
- the responder performs a responder transmission sector sweep (Responder TXSS) and responds to the initiator TXSS.
- the responder switches the transmission sector for each SSW frame 521, 522, 523 and transmits each SSW.
- the initiator sends an SSW feedback (SSW-FB) frame 531 and the responder sends an SSW Acknowledgment (SSW-ACK) frame 541 to complete SLS.
- SSW-FB SSW feedback
- SSW-ACK SSW Acknowledgment
- the initiator When the initiator performs BRP, the initiator transmits a BRP frame 601 to the responder.
- the responder receives the BRP frame 601
- the responder transmits a BRP frame 602 including a response to the initiator according to the type of request (described later) included in the BRP frame 601.
- BRP is performed by repeatedly transmitting a BRP frame between an initiator and a responder (Beam Refinement Transaction, hereinafter referred to as BRT).
- the BRP may include one or more subphases before the BRT.
- the sub-phase includes a setup sub-phase, a MID (Multiple Sector Identifier) sub-phase, a BC (Beam Combining) sub-phase, and a MIDC (MID Capture) sub-phase. This is done by sending
- the initiator may end the BRT and stop the BRP by stopping the transmission of the BRP frame.
- the initiator and responder may include a BRP frame request in the SSW-FB and SSW-ACK frames and perform BRP following SLS.
- the initiator sets the value of the TX-TRN-REQ subfield of the SSW-FB frame 531 to 1, performs BRP after completion of SLS, and requests the responder to perform transmission BFT.
- the initiator sets the value of the L-RX subfield of the SSW-FB frame 531 to 1 or more (L-RX> 0 in FIG. 3), performs BRP after completion of SLS, and sets the responder to perform reception BFT. Request.
- the initiator transmits a BRP frame 601 with the Capability Request subfield set to 1.
- the responder and the initiator transmit the BRP frames 604 and 605 in which the Capability Request subfield is set to 0, the setup subphase is completed.
- the initiator sets the TX-FBCK-REQ subfield to 1 and sets the SNR Requested subfield to 1 for transmission.
- the responder In response to the SNR Requested subfield of the BRP frame 601 being set to 1, the responder includes the Channel Measurement Feedback element in the BRP frame 602, and is receiving the BRP frame 601 in the SNR field of the Channel Measurement Feedback element.
- the measured SNR (Signal to Noise Ratio) value that is, the reception quality value is set.
- a plurality of SNR values may be used.
- the SNR Present subfield is set to 1, and the initiator is notified that the value of the SNR field of the Channel Measurement Feedback element is valid.
- the responder transmits the Sector ID Order field of the Channel Measurement Feedback element, which will be described later, including the transmission sector ID and antenna ID values corresponding to the SNR value.
- Set the Sector ID Order Present subfield to 1, and notify the initiator that the Sector ID Order field value of the Channel Measurement Feedback element is valid.
- the transmitting apparatus notifies the reception quality measurement results corresponding to a plurality of transmission sectors, that is, a list of measurement results, to the SNR field and the Sector ID Order field of the Channel Measurement Feedback element. To do.
- the transmitting apparatus regards the Sector ID included in the measurement result list as a candidate transmission sector, and performs the Beam Refinement Transaction so as to test the combination of the candidate transmission sector and the reception sector, thereby obtaining the provisional information obtained by the SLS. It is possible to find a true best sector with better communication quality than a typical best sector.
- FIG. 4 is a diagram showing the SISO BRP TXSS procedure of the 802.11ay draft standard.
- SISO BRP TXSS is a method in which an initiator and a responder perform transmission and reception BFT using a BPR frame.
- the role and transmission order of each BRP frame is determined in advance, so the processing required for a response at the initiator and responder (processing from reception of a BRP frame until transmission of the next BRP frame) Time can be shortened.
- the frames transmitted to the initiator and the responder during the SISO BRP TXSS period are all BRP frames, but FIG.
- Setup BRP frames 701 and 702 are frames that notify the start of the SISO BRP TXSS procedure by setting the BRP-TXSS field of the BRP frame to 1 and the TXSS-MIMO field to 0.
- the initiator sends a Setup BRP frame 701 to notify the start of the SISO BRP TXSS procedure
- the responder sends a Setup BRP frame 702 to accept the start of the SISO BRP TXSS procedure.
- the EDMG BRP-TX frame 703 is a BRP frame for performing transmission BFT of the initiator.
- the Feedback BRP frame 704 is a frame for notifying the result of the initiator's transmission BFT.
- the responder transmits information including the best sector (best AWV) information in the BS-FBCK subfield of the Feedback BRP frame 704.
- the responder includes an EDMG Channel Measurement Feedback element in the Feedback BRP frame 704, and includes multiple combinations of AWV, transmit antenna ID, and receive antenna ID as information indicating the result of the transmit BFT in the EDMG Sector ID Order field.
- the SNR value may be included for each combination of the above-described AWV, transmission antenna ID, and reception antenna ID.
- the responder can include an AWV list indicating the result of the transmission BFT in the EDMG Sector ID Order field, similarly to the Sector ID Order field of the BRP frame 602 of FIG.
- the responder may include training results (SNR, reception quality) regarding a plurality of AWVs in the EDMG Sector ID Order field, for example, the best AWV, the second best AWV,..., The nth best AWV.
- SNR reception quality
- the responder for example, the best AWV for the combination (0, 0) of the transmission antenna ID and the reception antenna ID, the best AWV for (0, 1), the best AWV for (1, 0), (1 , 1)
- a training result (SNR, reception quality) related to AWV may be included for each combination of transmission antenna ID and reception antenna ID.
- the EDMG BRP-RX frame 705 is a BRP frame that performs the reception BFT of the responder.
- the EDMG BRP-TX frame 706 and the Feedback BRP frame 707 are a BRP frame for responder transmission BFT and feedback, respectively.
- the EDMG BRP-RX frame 708 is a BRP frame that performs reception BFT of the initiator. Note that the transmission / reception of the EDMG BRP-TX frame 706, the Feedback BRP frame 707, and the EDMG BRP-RX frame 708 may be omitted.
- the initiator sends an Ack BRP frame 709 and notifies the responder of the end of the SISO BRP TXSS procedure.
- the initiator transmits the Ack BRP frame
- the initiator changes the transmission AWV based on the value of the BS-FBCK field included in the Feedback Ack frame 704.
- the initiator performs reception BFT by receiving the EDMG BRP-RX frame 708, and changes the reception AWV of the initiator based on the result.
- the responder When the responder receives the Ack BRP frame, the responder changes the transmission AWV based on the value of the BS-FBCK field included in the Feedback Ack frame 707. Further, the responder performs reception BFT by receiving the EDMG BRP-RX frame 705, and changes the reception AWV of the responder based on the result.
- the initiator and responder send and receive using the best sector (AWV) set by the SISO BRP TXSS procedure.
- ABV best sector
- the initiator transmits single stream (SISO) data frames 710 and 712 using the optimal transmission AWV specified in the BS-FBCK field of the feedback BRP frame 704.
- the initiator receives BA (BlockAck) frames 711 and 713 using the optimal reception AWV determined through reception of the EDMG BRP-RX frame 705.
- the SU-MIMO BFT procedure is a method in which an initiator and a responder perform BFT frame transmission and reception BFT using a BPR frame.
- the SU-MIMO BFT procedure is performed prior to SU-MIMO data communication.
- the SU-MIMO BFT procedure includes a SISO phase and a MIMO phase.
- the SISO phase includes a method using a MIMO BRP TXSS procedure (FIG. 5) and a method using a SISO Feedback procedure (FIG. 6).
- Setup BRP frames 801 and 802 are frames for notifying the start of the MIMO BRP TXSS procedure by setting the BRP-TXSS field of the BRP frame to 1 and the TXSS-MIMO field to 1.
- the initiator sends a Setup BRP frame 801 to notify the start of the MIMO BRP TXSS procedure, and the responder sends a Setup BRP frame 802 to accept the start of the MIMO BRP TXSS procedure.
- the EDMG BRP-TX frame 803 is a BRP frame for performing transmission BFT of the initiator.
- the training pattern may be transmitted from each of the transmission antennas 101a and 101b by switching the transmission antenna during transmission of the EDMG BRP-TX frame 803.
- the initiator may perform training for each of the transmission antennas 101a and 101b by transmitting a plurality of BRP-TX frames 803 for each of the transmission antennas 101a and 101b.
- the initiator repeats transmission of the BRP-TX frame 803 according to the number of responder receiving antennas (antenna arrays) 101a and 101b, so that all combinations of the transmitting antennas of the initiator and the receiving antennas of the responder are combined. Train about.
- the Feedback BRP frame 804 is a frame for notifying the result of the initiator's transmission BFT.
- the responder includes an EDMG Channel Measurement Feedback element in the Feedback BRP frame 804, and includes multiple combinations of AWV, transmit antenna ID, and receive antenna ID in the EDMG Sector ID Order field as information indicating the result of the transmit BFT.
- an SNR value is included for each set of the above-described AWV, transmission antenna ID, and reception antenna ID.
- the initiator feeds back multiple AWVs to the EDMG Sector ID Order field for each combination of initiator transmission antenna and responder reception antenna. If the number of AWVs is 16 or less in each combination, select all AWVs. If it exceeds 16, select 16 initiators (for example, select 16 receivers with good reception quality) EDMG Sector ID Order Include in the field.
- the responder transmits the EDMG BRP-TX frame 805, and the initiator receives the Feedback BRP frame 806.
- the initiator performs the same training as the EDMG BRP-TX frame 803 and the Feedback BRP frame 804.
- the responder transmits an Ack BRP frame 807 and completes the MIMO BRP TXSS procedure.
- the initiator and responder transmit MIMO BF Setup BRP frames 851 and 852 to notify the start of the MIMO phase.
- the initiator and the responder include a list of combinations of transmission / reception antennas and AWV for performing MIMO BFT training in the MIMO BF Setup BRP frames 851 and 852 based on the feedback result (Feedback BRP frames 804 and 806) received in the SISO phase. .
- the initiator and responder send EDMG BRP-RX / TX frames 853 and 854 to perform MIMO BFT training, respectively. This is based on the combination of transmit and receive antennas and AWV included in MIMO BF Setup BRP frames 851 and 852, and MIMO training patterns (simultaneous transmission of training signals with multiple antennas) are sent to EDMG BRP-RX / TX frames 853 and 854. This is done by including.
- the initiator and responder transmit MIMO BF Feedback frames 855 and 856, and complete the MIMO phase and SU-MIMO BFT.
- the initiator and responder transmit a SU-MIMO data frame (not shown) using the combination of the transmission / reception antenna and AWV notified by the MIMO BF Feedback frames 855 and 856.
- SISO BFT 811 may be, for example, SLS (see FIG. 3), SISO BRP TXSS (see FIG. 4), and MIMO BRP TXSS (see FIG. 5).
- the initiator performs training for all combinations of each transmission antenna of the initiator and each reception antenna of the responder.
- the responder keeps the result.
- the BF control circuit 124 holds the SNR value for the combination of the transmission / reception antenna and the AWV in the memory.
- the responder performs training for all combinations of the responder's transmitting antennas and the initiator's receiving antennas.
- the initiator holds the result.
- the initiator and responder in SU-MIMO BFT may be the same as the initiator and responder in SISO BFT, or vice versa (initiator and responder are interchanged).
- the initiator and responder include the EDMG Channel Measurement Feedback element in the Feedback BRP frames 812 and 813, and the combination of AWV, transmission antenna ID, and reception antenna ID as information indicating the result of the transmission BFT in the EDMG Sector ID Order field. Including one or more, the SNR value of the above-mentioned AWV, transmission antenna ID, and reception antenna ID is included in the SNR field of the Channel Measurement Feedback element. This corresponds to information included in the Feedback BRP frames 806 and 804 in FIG.
- the initiator and responder include, in the MIMO BF Setup BRP frames 851a and 852a, a list of combinations of transmission / reception antennas and AWVs that perform MIMO BFT training based on the received feedback results (Feedback BRP frames 812 and 813).
- time may be allowed between the SISO BFT 811 and the Feedback BRP frame 812.
- another communication device (not shown) may perform data communication after SISO BFT811.
- the SISO Feedback procedure in FIG. 6 can be completed in a short time because the number of frames to be transmitted / received is smaller than the MIMO BRP TXSS in FIG. 5. It is necessary to hold training results for AWV combinations.
- the MU-MIMO BFT procedure is a method in which an initiator and a plurality of responders perform transmission of a plurality of antennas and BFT of one or a plurality of reception antennas using a BPR frame.
- the MU-MIMO BFT procedure is performed prior to MU-MIMO data communication.
- MU-MIMO BFT procedure includes SISO phase and MIMO phase.
- the MIMO phase is a procedure for performing MIMO transmission training in the same manner as the MIMO phase of SU-MIMO BFT. Detailed description is omitted.
- the SISO phase includes an initiator TXSS subphase and a SISO Feedback subphase (see FIG. 7), but there are cases where the initiator TXSS subphase is omitted (FIG. 8).
- an initiator for example, communication device 100
- a responder 1 for example, communication device 200
- a responder 2 for example, communication device 300
- the initiator changes the transmission sector for each of the plurality of Short SSW frames 901 and 902 and transmits each Short SSW frame.
- the responder 1 and the responder 2 measure and hold the reception quality of the Short SSW frames 901 and 902.
- the BF control circuit 124 holds the SNR value for the combination of the transmission / reception antenna and the sector in the memory.
- the initiator transmits a Poll BRP frame to each responder, and obtains a response by the Feedback BRP frame.
- the initiator transmits a poll BRP frame 911 to the responder 1.
- the responder 1 includes an EDMG Channel Measurement Feedback element in the Feedback BRP frame 912, and includes a plurality of pairs of AWV, transmission antenna ID, and reception antenna ID as information indicating the result of the transmission BFT in the EDMG Sector ID Order field.
- the SNR value is included in the SNR field of the Measurement Feedback element for each set of the AWV, transmission antenna ID, and reception antenna ID.
- the responder 912 includes an EDMG BRP Request element in the Feedback BRP frame 912, and includes information on the number of received AWVs that perform training in the MIMO phase in the L-TX-RX field and the Requested EDMG TRN UNIT M field.
- the initiator transmits a poll BRP frame 913 to the responder 2.
- the responder 2 transmits an EDMG Channel Measurement Feedback element and an EDMG BRP Request element in the Feedback BRP frame 914. Since it is the same as the Feedback BRP frame 912, other description is omitted.
- MIMO training is performed on the combination of transmission and reception antennas and AWVs specified in the feedback information included in the Feedback BRP frames 912 and 914, and the number of reception AWVs.
- the combination of transmission and reception antennas and AWVs used for MU-MIMO data communication is It is determined.
- Responder 1 performs SISO BFT 921 with the initiator and holds the training result. Details are the same as SISO BFT811 in FIG.
- the responder 2 performs SISO BFT 922 with the initiator and holds the training result.
- the responder 1 transmits a Feedback BRP frame 912a including a list of combinations of transmission / reception antennas and AWVs and an SNR value for each combination based on the training result held in the SISO BFT 921.
- the responder 2 transmits a Feedback BRP frame 914a including a list of combinations of transmission / reception antennas and AWVs and an SNR value for each combination based on the training result held in the SISO BFT 922.
- time may be allowed between the end of SISO BFT 921 and the start of SISO BFT 922 and between the end of SISO BFT 922 and the start of SISO phase.
- another communication device (not shown) may perform data communication after SISO BFT 922.
- the SISO phase of FIG. 8 can be completed in a short time because the number of frames to be transmitted and received is smaller than that of the SISO phase of FIG. It should be noted that the initiator and each responder hold the training result for the combination of the transmission / reception antenna and the AWV in the SISO BFT.
- FIG. 9 shows the format of the BRP frame used in FIGS.
- the BRP frame consists of a Frame Control field, a Duration field, an Address1 field, an Address2 field, a Category field, an Unprotected DMG (Directional multi-gigabit) Action field, a Dialog Token field, a BDM Request element, a BRP Request element, and a BRP Request element. Includes a Partial Sector Level Sweep element, an EDMG BRP Request element, and an EDMG Channel Measurement Feedback element.
- the Channel Measurement Feedback element, the EDMG Partial Sector Level Sweep element, the EDMG BRP Request element, and the EDMG Channel Measurement Feedback element are optional elements and may be omitted.
- the BRP frame has a single format shown in FIG. 9, but functions as a frame having a different role (for example, a Setup BRP frame or a Feedback BRP frame) as shown in FIGS.
- the communication device 100 determines that the received BRP frame is the BRP frame 601 in FIG. 3 (the initiator is SISO BRP). 4) or the setup BRP frame (initiator is intended for SISO BRP TXSS), the setup BRP frame (initiator is intended for SU-MIMO MIMO BRP TXSS), or FIG. Feedback BRP frame (initiator intends SU-MIMO SISO Feedback procedure), or Poll BRP frame in Fig. 8 (initiator intends SISO phase of MU-MIMO) Or, discrimination is difficult.
- the responder determines whether the SISO phase of SU-MIMO BFT (see FIG. 6) is executed after TXSS, and the initiator. It is difficult to know in advance whether or not a MU-MIMO BFT (see FIG. 8) in which TXSS subphase is omitted will be executed.
- the communication apparatus 100 determines the types of elements included in the BRP frame to be transmitted first according to the types of BFT procedures (FIGS. 3, 4, 5, 6, 7, and 8) executed using the BRP frame. And send it without including any other optional elements. As a result, the responder can determine the type of the BFT procedure.
- FIGS. 10A to 10D and 11 show the BRP frame transmitted first when the communication apparatus 100 (initiator and responder) performs the BFT procedure of FIGS. 3, 4, 5, 6, 7, and 8.
- FIG. It is a figure which shows the format of. 10A to 10D show elements included in the BRP frame, and FIG. 11 shows values of elements, fields, and subfields. In FIG. 11, some elements, fields, and subfields are shown, and others are omitted.
- the initiator when performing SISO TXSS BRP (see FIG. 3), transmits a 7-octet DMG Beam Refinement element in the BRP frame 601 in the Setup subphase.
- the BRP frames 701 and 801 have a 10-octet DMG Beam Refinement element, and an EDMG. Transmit including the BRP Request element.
- the initiator sets the value of the BRP-TXSS field to 1.
- the initiator sets the value of the TXSS-MIMO field of the BRP frame 701 to 0 in the case of SISO BRP TXSS, and sets the value of the TXSS-MIMO field of the BRP frame 801 to 1 in the case of MIMO BRP TXSS.
- the 7-octet DMG Beam Refinement element shown in FIG. 10A is defined in the 11ad standard
- the 10-octet DMG Beam Refinement element shown in FIG. 10B is defined in the 11ay draft standard.
- the initiator sets the value of the BRP-TXSS field to 1.
- the initiator sets the SNR Requested field and the Sector ID Order subfield of the FBCK-REQ field to 1, respectively. This requests the responder to feed back the list of AWV and SNR. Further, the initiator sets the values of the SNR Present subfield and the Sector ID Order Present subfield of the TXSS-FBCK-REQ field and the FBCK-TYPE field to 1.
- the initiator notifies that the value of the SNR field of the Channel Measurement Feedback element of the BRP frame 812 and the value of the EDMG Sector ID Order field of the EDMG Channel Measurement Feedback element are valid.
- the initiator transmits the BRP frames 911 and 911a including the 10-octet DMG Beam Refinement element.
- the initiator sets the values of the SNR Present subfield and the Sector ID Order Present subfield of the TXSS-FBCK-REQ field and the FBCK-TYPE field to 1.
- the initiator sets a value obtained by subtracting 2 octets (a value obtained by adding the number of octets in the Element ID field and the Length field) from the number of octets in the DMG Beam Refinement element in the Length field of the DMG Beam Refinement element.
- FIG. 12 is a flowchart showing a procedure for discriminating the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives a BRP frame.
- step S1001 the responder receives the BRP frame.
- step S1002 the responder determines whether the length of the DMG Beam Refinement element is 10 octets or more (length field value is 8 or more). In the case of Yes, it progresses to step S1003. In No, it progresses to step S1020.
- the responder may determine whether the value of the EDMG Extension Flag field is 1 instead of determining the length of the DMG Beam Refinement element. No when the value of the EDMG Extension Flag field is 1, No when the value of the EDMG Extension Flag field is 0, and when the field does not exist.
- step S1003 the responder determines whether an EDMG BRP Request element exists. In the case of Yes, it progresses to step S1004. If no, go to Step 1006.
- step S1004 the responder determines whether the values of the BRP-TXSS field and the TXSS-Initiator field are both 1. In the case of Yes, it progresses to step S1005. If no, go to Step 1020.
- step S1005 the responder determines whether the value of the TXSS-MIMO field is 0 or not. In the case of Yes, it progresses to step S1011. If no, go to Step 1013.
- step S1006 the responder determines whether an EDMG Channel Measurement Feedback element exists. In the case of Yes, it progresses to step S1015. If no, go to Step 1017.
- the responder may determine whether there is a Channel Measurement Feedback element instead of determining whether there is an EDMG Channel Measurement Feedback element.
- the responder may determine whether the value of the EDMG Channel Measurement Present subfield is 1.
- the responder may determine whether each subfield of the FBCK-TYPE field includes a non-zero value.
- step S1011 the responder determines that the received BRP frame is the Setup BRP frame 701 of SISO BRP TXSS (FIG. 4). In step S1012, the Setup BRP frame 702 is transmitted.
- step S1013 the responder determines that the received BRP frame is the Setup BRP frame 801 of the MIMO BRP TXSS (FIG. 5).
- step S1014 the Setup BRP frame 802 is transmitted.
- step S1015 the responder determines that the received BRP frame is the SU-MIMO BFT SISO Feedback procedure Feedback BRP frame 812.
- step S1016 the Feedback BRP frame 813 is transmitted.
- step S1017 the responder determines that the received BRP frame is a MU-MIMO BFT poll BRP frame 911 or 911a.
- step S1018 the Feedback BRP frames 912 and 912a are transmitted.
- the responder determines that the received BRP frame is not the EDMG BRP procedure (any of FIGS. 4, 5, 6, 7, and 8), and performs the SISO BRP procedure of FIG. To do so, a BRP frame 602 is transmitted.
- FIG. 13 shows the types of SISO BFT that the initiator can use in combination with the SISO Feedback procedure of SU-MIMO BFT by using the BRP frame of FIGS. 10A to 10D and FIG. 11 as the first BRP frame of each procedure. Show.
- the communication apparatus (STA) 100 performs the SLS in FIG. 3 with the STA 200, and completes the SISO BFT and the SU-MIMO BFT by performing the SISO Feedback procedure and MIMO Phase in FIG.
- the STA 100 completes the SISO BFT and the SU-MIMO BFT by performing the SISO BRP TXSS of FIG. 4 with the STA 200 and performing the SISO Feedback procedure and MIMO Phase of FIG.
- the STA 100 completes the first SU-MIMO BFT by performing the MIMO BRP TXSS and MIMO Phase of FIG. 5 with the STA 200.
- the STA 100 may complete the second SU-MIMO BFT by performing the SISO Feedback procedure and MIMO Phase of FIG.
- the STA 100 and the STA 200 complete the first SU-MIMO BFT and perform SU-MIMO data transmission.
- the STA 100 and the STA 200 hold it in the first SU-MIMO BFT.
- the transmission / reception antenna and AWV combination and the SNR included in the Feedback BRP frames 812 and 813 in FIG. 6 are transmitted, and the SU-MIMO BFT is completed.
- MIMO BRP TXSS and SISO TXSS (811 in FIG. 6) can be omitted, and the time for executing SU-MIMO BFT can be shortened.
- FIG. 14 shows details of the procedure when the communication device (initiator and responder) performs the SU-MIMO BFT of FIG. 6 using the BRP frame shown in FIGS. 10A to 10D and FIG.
- the same numbers are assigned to the same BRP frames as in FIG.
- the initiator and responder transmit the Capability information 401 and 402 before starting the SU-MIMO BFT.
- Capability information includes a list of functions supported by the initiator and the responder, and includes a field indicating whether SU-MIMO and MU-MIMO are supported.
- the initiator and responder include the MU-MIMO BFT (FIG. 8) in which the SISO BRP TXSS (FIG. 4), the MIMO BRP TXSS (FIG. 5), the SISO Feedback procedure (FIG. 6), and the initiator TXSS are omitted in the capability information 401 and 402. ) May be included, respectively.
- the initiator and the responder When the initiator and the responder are notified to each other by the Capability information that the initiator and the responder support SU-MIMO, the initiator and the responder perform SISO BFT during execution of TXSS811a, and use it for SU-MIMO BFT as a TXSS training result for MIMO.
- the combination of transmission / reception antennas and AWVs to be used and the SNR value for each combination are measured and held.
- the SU-MIMO BFT can be executed correctly.
- the initiator and responder may execute TXSS 811a before transmitting the capability information 401, 402. For this reason, when the initiator executes TXSS 811a after transmitting the capability information 401, 402, the initiator may start the SISO Feedback procedure by transmitting the Feedback BRP frame 812.
- the initiator sends Capability information including information indicating whether to support SU-MIMO and MU-MIMO before executing the responder and TXSS 811a to the responder. For this reason, the responder can hold the TXSS training result for MIMO during the execution of TXSS 811a, and include the TXSS training result for MIMO in the Feedback BRP frame 813.
- the responder When the responder receives the BRP frame, the responder responds according to the intention of the received BRP frame using the flowchart of FIG. 12 (Setup BRP frame 602, Setup BRP frames 701 and 802, or Feedback BRP frames 813 and 912). Instead of performing the above, the response may be performed using the format of the common Feedback BRP frame 981.
- FIG. 15 shows the format of the common Feedback BRP frame 981.
- the responder includes a 10-octet DMG Beam Refinement element, a Channel Measurement Feedback element, an EDMG BRP Request element, and an EDMG Channel Measurement Feedback element in the BRP frame 981.
- the responder sets the value of the EDMG Extension Flag field of the DMG Beam Refinement element of the BRP frame 981 to 1, the value of the EDMG Channel Measurement Present field of 1, the SNR Present subfield of the FBCK-TYPE field, and the SNR Present subfield of the SNR Present subfield. Set to 1 for each.
- the responder When responding to SU-MIMO or MU-MIMO, the responder feeds back multiple AWVs for each combination of initiator transmit antenna and responder receive antenna to the EDMG Sector ID Order field of the EDMG Channel Measurement Feedback element. If the number of AWVs is 16 or less for each combination of transmission and reception antennas, select all AWVs. If it exceeds 16, the initiator selects 16 (for example, selects 16 with good reception quality) Include in the EDMG Sector ID Order field. This information is used as essential information in SU-MIMO BFT and MU-MIMO BFT, but may be used in SISO BFT.
- the responder includes the SNR value for each AWV in the SNR field of the Channel Measurement Feedback element.
- the responder includes information on the number of received AWVs to be trained when receiving the SED BRP TXSS EDMG BRP-RX frame 705 in the L-RX field Requested EDMG TRN UNIT M field of the EDMG BRP Request element.
- the L-TX-RX field and the Requested EDMG TRN UNIT M field of the EDMG BRP Request element include information on the number of received AWVs that perform training in the MIMO phase of the MU-MIMO BFT. .
- the responder responds to the first BRP frame transmitted by the initiator using the common Feedback BRP frame 981, so that the BFT intended by the initiator is SISO BFT, SU-MIMO BFT, MU-MIMO BFT. In any case, an appropriate response can be made.
- the communication apparatus 100 determines the types of SISO, SU-MIMO, and MU-MIMO according to the type of BFT procedure executed using the BRP frame (FIGS. 3, 4, 5, 6, 7, and 8). Is included in the first BRP frame to be transmitted.
- the responder can determine the type of the BFT procedure (FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8) based on the combination of the field indicating the type and another field.
- FIG. 16 is a diagram showing a BRP frame format according to the second embodiment.
- the DMG Beam Refinement element includes a BF Training Type field.
- a value 0 represents SISO
- a value 1 represents SU-MIMO
- a value 2 represents MU-MIMO.
- Value 3 is a reserved value (Reserved).
- the initiator When the initiator performs the SISO BRP Setup subphase (FIG. 3), the initiator sets the value of the BF Training Type field of the BRP frame 601 to 0 (SISO).
- the value of the BF Training Type field of the Setup BRP frame 701 is set to 0 (SISO).
- the initiator When the initiator performs MIMO BRP TXSS (FIG. 5), the initiator sets the value of the BF Training Type field of the Setup BRP frame 801 to 1 (SU-MIMO).
- the initiator When the initiator performs SU-MIMO SISO Feedback procedure (FIG. 6), it sets the value of the BF Training Type field of the Feedback BRP frame 812 to 1 (SU-MIMO).
- the initiator sets the value of the BF Training Type field of the Poll BRP frame 911a to 2 (MU-MIMO) when performing the SISO Feedback subphase of MU-MIMO (FIG. 8).
- FIG. 17 is a diagram showing a procedure in which the initiator and responder perform SISO BRP TXSS and SU-MIMO BFT using the BRP frame of FIG.
- the same BRP frame as in FIGS. 4 and 14 is assigned the same number, and description thereof is omitted.
- the initiator sets the BF Training Type field of the Setup BRP frame 701a to 0 and transmits it in order to perform SISO BRP TXSS.
- the responder In order to respond to the initiator that the SISO BRP TXSS can be executed, the responder sets the BF Training Type field of the Setup BRP frame 702a to 0 and transmits the response.
- the initiator When the initiator completes the SISO BRP TXSS, the initiator performs the SU-MIMO SISO Feedback procedure, so that the BF Training Type field of the Feedback BRP frame 812a is set to 1 and transmitted.
- the responder sets the BF Training Type field of the Feecdback BRP frame 813a to 1 and transmits it.
- FIG. 18 is a flowchart showing a procedure for determining the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives the BRP frame of FIG. The same processes as those in FIG.
- step S1003 If the responder is No in step S1003 or step S1004, the responder proceeds to step S1103a.
- step S1103a when the value of the BF Training Type field is 0, the responder proceeds to step S1020. In this case, the responder determines that the received BRP frame is a BRP frame for SISO BFT, but is not SISO BRP TXSS and MIMO BRP TXSS.
- step S1103a if the value of the BF Training Type field is other than 0, the responder proceeds to step S1103b.
- step S1103b when the value of the BF Training Type field is 1, the responder proceeds to step S1015.
- the responder determines that the received BRP frame is a BRP frame for SU-MIMO, and is a frame notifying the start of the SISO Feedback procedure.
- step S1103b when the value of the BF Training Type field is other than 1, the responder proceeds to step S1103c.
- step S1103c if the value of the BF Training Type field is 2, the responder proceeds to step S1017. In this case, the responder determines that the received BRP frame is a BRP frame for MU-MIMO, and is a frame notifying the start of SISO Feedback Backphase.
- step S1103c if the value of the BF Training Type field is other than 2, the responder proceeds to step S1030. In this case, the responder determines that the received BRP frame is a frame that notifies the start of a procedure that does not support (for example, a part of a future standard that extends the 11ay standard).
- the initiator When the initiator starts SISO BFT, SU-MIMO BFT, and MU-MIMO BFT using the BRP frame, the initiator transmits the BRP frame including the BF Training Type field.
- the responder determines the type of BFT procedure using the procedure of FIG. Since the responder can determine the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8), the BFT is executed by combining different BFT procedure types to execute the BFT. Time can be shortened.
- the initiator may transmit an optional (not essential) element, unlike the case of using the frame format of FIGS. 10A to 10D.
- the initiator includes the Channel Measurement Feedback element and the EDMG Channel Measurement Feedback element in the SISO BRP TXSS Setup BRP frame 701, and transmits and receives the NR of the SU-MIMO SISO FeedbackAce in the NR May be included.
- the initiator can omit the SISO Feedback procedure of the SU-MIMO BFT and start the MIMO phase, thereby shortening the execution time of the SU-MIMO BFT.
- the responder determines the BFT type using the procedure of FIG. 18, even if an optional (not required) element is included in the BRP frame transmitted from the initiator at the beginning of the BRP procedure, the BFT type is set. Since it can be correctly identified, the SISO BRP TXSS can be correctly executed when the Channel Measurement Feedback element and the EDMG Channel Measurement Feedback element are included in the SISO BRP TXSS Setup BRP frame 701 as described above.
- the initiator when performing SISO BRP TXSS (FIG. 4) or MIMO BRP TXSS (FIG. 5), the initiator sets the value of the BF Training Type field to 0, and the SU-MIMO BFT SISO.
- the value of the BF Training Type field may be set to 1 when performing the Feedback Procedure, and the value of the BF Training Type field may be set to 2 when performing the SISO Feedback subphase of the MU-MIMO BFT.
- FIG. 19 is a diagram showing an example of a format different from FIG. 16 of the BRP frame. Unlike FIG. 16, the BF Training Type field is 1 bit.
- the initiator When the initiator performs SISO BFT (MIMO BRP TXSS in FIGS. 3, 4, and 5), it sets the value of the BF Training Type field to 0. When performing MIMO BFT (FIG. 6, FIG. 7, FIG. 8), the value of the BF Training Type field is set to 1.
- the MIMO BRP TXSS in FIG. 5 is regarded as a SISO BFT and the value of the BF Training Type field is set to 0 will be described.
- the MIMO BRP TXSS is regarded as a MIMO BFT and the value of the BF Training Type field is set to 1. Even so, it is the same.
- FIG. 20 is a flowchart showing a procedure for determining the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8) when the responder receives the BRP frame of FIG. The same processes as those in FIG.
- step S1003 If the responder is No in step S1003 or step S1004, the responder proceeds to step S1203.
- step S1203 if the value of the BF Training Type field is 0, the responder proceeds to step S1020. In this case, the responder determines that the received BRP frame is a BRP frame for SISO BFT but is not SISO BRP TXSS and MIMO BRP TXSS.
- step S1203 if the value of the BF Training Type field is 1, the responder proceeds to step S1006. In this case, the responder determines that the received BRP frame is a BRP frame for SU-MIMO BFT or MU-MIMO BFT.
- the responder process in step S1006 is the same as in FIG.
- the initiator sets the value of the BF Training Type field to 1 when performing the SISO Feedback Procedure of SU-MIMO BFT or the SISO Feedback subphase of MU-MIMO BFT, and in other cases
- the BF Training Type field may be set to 0.
- the initiator sets the value of the BF Training Type field to 1 when performing the SISO Feedback subphase of the MU-MIMO BFT, and sets the BF Training Type field to 0 in other cases. You may do it.
- step S1203 in FIG. 20 instead of determining whether the value of BF Training Type is 0, the responder proceeds to step S1020b when the EDMG BRP Request element is present, as in S1003 in FIG.
- step S1006 if the value of the BF Training Type field is 0, the process proceeds to step S1015. If the value is 1, the process proceeds to step S1017.
- the initiator When the initiator starts SISO BFT, SU-MIMO BFT, and MU-MIMO BFT using the BRP frame, the initiator transmits the BRP frame including the BF Training Type field.
- the responder determines the type of BFT procedure using the procedure of FIG. Since the responder can determine the type of BFT procedure (FIGS. 3, 4, 5, 6, 7, and 8), the BFT is executed by combining different BFT procedure types to execute the BFT. Time can be shortened.
- the initiator uses the BRP frame of FIG. 19 instead of the BRP frame of FIG. 16 at the beginning of the BRP procedure, the number of bits in the BF Training Type field may be small, and many Reserved bits can be left. It is easy to expand the functions of the BRP frame in the future.
- the communication apparatus 100 uses the feedback value transmitted in the SISO phase of the SU-MIMO BFT (see FIG. 6) for the Beam Refinement Transaction of the SISO BFT.
- Setup subphase (see FIG. 3) in BRP for SISO training can be omitted, and training can be completed early.
- FIG. 21 is a diagram showing an example of a procedure in which the initiator and the responder perform SISO BFT and SU-MIMO BFT.
- the same numbers are assigned to the same BRP frames as in FIGS. 4, 6, and 17, and the description thereof is omitted.
- the initiator and responder execute SISO BFT (TXSS811), SU-MIMO BFT (including SISO Feedback procedure and MIMO phase), as in FIG. Note that in the SISO Feedback procedure, the initiator may use the BRP frame shown in FIGS. 10A to 10D, FIG. 16, and FIG.
- Initiator executes Beam Refinement Transaction after completing SU-MIMO BFT. (BRP frame 606, 607, 608)
- the initiator and responder When executing the Beam Refinement Transaction, the initiator and responder use the Channel Measurement FeededFieldID field value and the Channel Measurement FeededFieldID value of the NRMG Channel Measurement Feedfield field and the Channel Measurement Feedback element included in the Feedback BRP frames 812a and 813a. Determine the AWV that performs Beam Refinement Transaction. For this reason, the initiator and responder can omit the SISO BRP setup subphase (see FIG. 3) before executing the Beam Refinement Transaction.
- the initiator and responder complete the SISO BFT by completing the Beam Refinement Transaction.
- the procedure shown in FIG. 21 allows the initiator and responder to execute a combination of SISO BFT and SU-MIMO BFT, omitting the SISO BRP setup subphase, and executing both SISO BFT and SU-MIMO BFT. Can be shortened.
- the communication apparatus 100 uses the feedback value transmitted in the SISO phase of the SU-MIMO BFT (see FIG. 6) as the beam refinement transaction of the SISO BFT, and uses the SISO phase and MIMO phase to transmit the SISO BFT (Beam Retransition). Insert and execute. Setup subphase (see FIG. 3) in BRP for SISO training can be omitted, and training can be completed early.
- FIG. 22 is a diagram illustrating an example of a procedure in which the initiator and the responder perform SISO BFT and SU-MIMO BFT.
- the same numbers are assigned to the same BRP frames as in FIGS. 4, 6, and 17, and the description thereof is omitted.
- the initiator and responder execute SISO BFT (TXSS811) and SU-MIMO BFT (SISO Feedback procedure), as in FIG. Note that in the SISO Feedback procedure, the initiator may use the BRP frame shown in FIGS. 10A to 10D, FIG. 16, and FIG.
- the initiator starts the SEM BRP Beam Refinement Transaction after the completion of the SISO Feedback procedure.
- the initiator and responder use the Channel Measurement FeededFieldID field value and the Channel Measurement FeededFieldID value of the NRMG Channel Measurement Feedfield field and the Channel Measurement Feedback element included in the Feedback BRP frames 812a and 813a. Determine the AWV that performs Beam Refinement Transaction. For this reason, the initiator and responder can omit the SISO BRP setup subphase (see FIG. 3) before executing the Beam Refinement Transaction.
- the initiator starts the MIMO phase after completing the Beam Refinement Transaction.
- the initiator and responder can be omitted because the SISO Feedback procedure has been completed.
- the procedure shown in FIG. 22 allows the initiator and responder to execute a combination of SISO BFT and SU-MIMO BFT, omitting the SISO BRP setup subphase, and executing both SISO BFT and SU-MIMO BFT. Can be shortened.
- the communication apparatus 100 updates the best sector of SISO during the MIMO BRP TXSS of FIG. This is called SISO / MIMO BRP TXSS. SISO training can be omitted and training can be completed early.
- FIG. 23 is a diagram illustrating an example of a procedure in which the initiator and the responder perform SISO BFT and SU-MIMO BFT.
- the same numbers are assigned to the same BRP frames as in FIGS. 4 and 5, and the description thereof is omitted.
- the initiator sends a Setup BRP frame 1701.
- FIG. 24 shows the format of the BRP frame 1701.
- the BRP frame 1701 includes a TXSS-SISO field and a TXSS-MIMO field.
- the initiator sets the TXSS-SISO field to 1 and sets the TXSS-MIMO field to 1 in the Setup BRP frame 1701 for transmission. Further, the initiator may transmit the Setup BRP frame 1701 including information related to training of the received AWV (for example, setting the number of received AWVs in the L-RX field).
- the responder When the responder receives the Setup BRP frame 1701, the responder sets the TXSS-SISO field of the Setup BRP frame 1702 to 1 and transmits the TXSS-MIMO field set to 1.
- the initiator and responder transmit EDMG BRP-TX frames 1703 and 1706.
- EDMG BRP-TX frames 1703 and 1706 are the same as EDMG BRP-TX frames 703 and 706 and EDMG BRP-TX frames 803 and 805, but the initiator and responder receive EDMG BRP-TX frames 1706 and 1703
- the same processing as the SISO phase of SISO BFT and SU-MIMO BFT is performed. That is, the best sector necessary for SISO BFT is selected and the list of AWV necessary for MIMO BFT is stored.
- the initiator and responder transmit Feedback BRP frames 1704 and 1707.
- the Feedback BRP frames 1704 and 1707 include information on the best sector corresponding to the SISO BFT result (for example, included in the BS-FBCK field) and feedback in the SISO phase of the SU-MIMO BFT (for example, the Channel Measurement Feedback element, EDMG Channel). Both of the EDMG Sector ID Order field and SNR field values to be included in the Measurement Feedback element.
- the initiator and responder may perform training of reception AWV in SISO using EDMG BRP-RX frames 705 and 708 as in FIG.
- the initiator after completing the SISO / MIMO BRP TXSS, transmits a MIMO BF Setup BRP frame 851a to perform the MIMO phase.
- the initiator may use the format shown in FIG. 24 in the Setup BRP frame 701 and transmit the TXSS-SISO field set to 1 and the TXSS-MIMO field set to 0. .
- the initiator may use the format shown in FIG. 24 in the Setup BRP frame 801 and transmit the TXSS-SISO field set to 0 and the TXSS-MIMO field set to 1. .
- the initiator When the initiator starts the SISO phase of SU-MIMO, the initiator includes the TXSS-SISO field and the TXSS-MIMO field in the Setup BRP frame 1701, and transmits each set to 1.
- the initiator and responder can complete the SISO BFT and SU-MIMO SISO phase training in the SISO phase of SU-MIMO, so the execution of SISO BRP TXSS is omitted, and SISO BFT and SU-MIMO are omitted.
- the time for executing BFT can be shortened.
- Each functional block used in the description of each embodiment described above can be realized by an LSI as an integrated circuit, and each process described in each embodiment may be controlled by the LSI. They may be individually formed as chips, or a single chip may be formed to include some or all functional blocks. They may include data input / output coupled to them.
- the LSI may be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.
- the technology for mounting an integrated circuit is not limited to LSI, and may be realized using a dedicated circuit or a general-purpose processor.
- FPGA Field Programmable Gate Array
- reconfigurable processor that can reconfigure the connections and settings of circuit cells located in the LSI. May be.
- a second feedback including an SNR (Signal to Noise Ratio) and a sector ID (Identifier) order is transmitted to the initiator, the initiator receives the second feedback, and the SNR And the sector ID order.
- a feedback frame including BF training type FIELD indicating whether or not to perform SU-MIMO BFT is transmitted to the responder, and the result of the TXSS is transmitted from the responder.
- Initiating the SU-MIMO BFT with the responder based on the SNR and the sector ID order when receiving the second feedback including the SNR and the sector ID order based on the SNR A communication method is provided.
- BF indicating whether or not to perform BFT (beam forming training) of SU-MIMO (Single-User-Multi-Input-Multi-Output) after completion of TXSS (Transmission Sector Sweep).
- a first feedback frame including training type FIELD is received from the initiator and the BF training type FIELD indicates that the SU-MIMO BFT is performed
- an SNR Signal to Noise Ratio
- a second feedback including a sector ID (Identifier) order to the initiator, and based on the SNR and the sector ID order, the responder performs the SU-MIMO BFT with the responder.
- a communication method is provided.
- the MAC circuit generates a first feedback frame including a BF training type FIELD indicating whether or not to perform SU-MIMO BFT after the end of TXSS, Transmits the first feedback frame to the responder, the receiving circuit receives the second feedback from the responder, and the MAC circuit determines that the second feedback frame is based on the TXSS result from the responder.
- an initiator communication device is provided that performs BFT with the responder using the transmission circuit and the reception circuit based on the SNR and the sector ID order. To do.
- the reception circuit performs BFT (beam forming training) of SU-MIMO (Single User Multi-Input Multi-Output) after completion of TXSS (transmission sector sweep).
- BFT beam forming training
- TXSS transmission sector sweep
- a transmission circuit transmits the second feedback to the initiator
- the MAC circuit includes: After sending the second feedback to the initiator, Provided is a responder communication device for performing the SU-MIMO BFT between the initiator and the initiator based on the SNR and the sector ID order using the transmission circuit and the reception circuit.
- This disclosure is suitable as a communication device compliant with the 802.11ad standard.
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Abstract
Description
通信装置100は、BRPフレームを用いて実行するBFT手順の種類(図3、図4、図5、図6、図7、図8)に応じて、始めに送信するBRPフレームに含めるエレメントの種類を決定し、他のオプションのエレメントを含めないで送信する。これにより、レスポンダは、BFT手順の種類を判別することができる。
通信装置100は、BRPフレームを用いて実行するBFT手順の種類(図3、図4、図5、図6、図7、図8)に応じて、SISO、SU-MIMO、MU-MIMOの種別を示すフィールドを始めに送信するBRPフレームに含めて送信する。レスポンダは、種別を示すフィールドと他のフィールドとの組み合わせにより、BFT手順の種類(図3、図4、図5、図6、図7、図8)を判別することができる。
通信装置100は、SU-MIMO BFTのSISO phase(図6を参照)において送信したフィードバックの値を、SISO BFTのBeam Refinement Transactionに用いる。SISOトレーニングのためのBRPにおけるSetup subphase(図3を参照)を省略でき、早期にトレーニングを完了することができる。
通信装置100は、SU-MIMO BFTのSISO phase(図6を参照)において送信したフィードバックの値を、SISO BFTのBeam Refinement Transactionに用い、SISO phaseとMIMO phaseの間にSISO BFT(Beam Refinement Transaction)を挿入して実行する。SISOトレーニングのためのBRPにおけるSetup subphase(図3を参照)を省略でき、早期にトレーニングを完了することができる。
通信装置100は、図5のMIMO BRP TXSS中にSISOのベストセクタを更新する。これをSISO/MIMO BRP TXSSと呼ぶ。SISOトレーニングを省略でき、早期にトレーニングを完了することができる。
101a、101b、201a、201b、301a、301b アンテナアレイ(送信アンテナ、受信アンテナ)
102a、102b スイッチ回路(SW)
103a、103b 送信RF(Radio Frequency)回路
104a、104b 受信RF回路
109、109a RFモジュール回路
110、110a PHY回路
111a、111b D/Aコンバータ
112a、112b A/Dコンバータ
113 アレイ制御回路
114 符号化・変調回路
115 復調・復号回路
120 MAC回路
121 アクセス制御回路
122 フレーム生成回路
123 フレーム受信回路
124 BF(ビームフォーミング)制御回路
130 ホスト
151、152 IF(Intermediate Frequency)転送回路
153 IFケーブル
Claims (15)
- 通信方法であって、以下を含む、
イニシエータは、
TXSS(送信セクタスイープ)終了後、SU-MIMO(Single User Multi-Input Multi-Output)のBFT(ビームフォーミングトレーニング)を実施するか否かを示すBF training type FIELDを含む第1フィードバックフレームをレスポンダに送信し、
前記レスポンダは、
前記第1フィードバックフレームを受信し、
前記BF training type FIELDが前記SU-MIMOのBFTを実施することを示す場合、前記TXSSの結果に基づいた、SNR(Signal to Noise Ratio)とセクタID(Identifier)オーダーとを含む第2フィードバックを前記イニシエータに送信し、
前記イニシエータは、
前記第2フィードバックを受信し、
前記SNRと前記セクタIDオーダーとに基づいて、前記レスポンダとの間で、前記SU-MIMOのBFTを実施する。 - 前記TXSSは、
DMG Beacon、SSW(Sector Sweep)、Short SSW及びDMG BRP(Beam Refinement Protocol)-TXのいずれかを用いて実行される、
請求項1記載の通信方法。 - 前記BF training type FIELDは、
SISOのBFTを示す場合は0にセットし、
前記SU-MIMOのBFTを示す場合は1にセットし、
MU-MIMOのBFTを示す場合は2にセットする、
請求項1記載の通信方法。 - イニシエータの通信方法であって、以下を含む、
TXSS終了後、SU-MIMOのBFTを実施するか否かを示すBF training type FIELDを含むフィードバックフレームをレスポンダに送信し、
前記レスポンダから前記TXSSの結果に基づいた、SNRとセクタIDオーダーと、を含む第2フィードバック受信した場合、前記SNRと前記セクタIDオーダーとに基づいて、前記レスポンダとの間で、前記SU-MIMOのBFTを実施する。 - 前記TXSSは、
DMG Beacon、SSW(Sector Sweep)、Short SSW及びDMG BRP(Beam Refinement Protocol)-TXのいずれかを用いて実行される、
請求項4記載のイニシエータの通信方法。 - 前記BF training type FIELDは、
SISOのBFTを示す場合は0にセットし、
前記SU-MIMOのBFTを示す場合は1にセットし、
MU-MIMOのBFTを示す場合は2にセットする、
請求項4記載のイニシエータの通信方法。 - レスポンダの通信方法であって、以下を含む、
TXSS(送信セクタスイープ)終了後、SU-MIMO(Single User Multi-Input Multi-Output)のBFT(ビームフォーミングトレーニング)を実施するか否かを示すBF training type FIELDを含む第1フィードバックフレームをイニシエータから受信し、
前記BF training type FIELDが前記SU-MIMOのBFTを実施することを示す場合、前記TXSSの結果に基づいた、SNR(Signal to Noise Ratio)とセクタID(Identifier)オーダーとを含む第2フィードバックを前記イニシエータに送信し、
前記SNRと前記セクタIDオーダーとに基づいて、前記レスポンダとの間で、前記SU-MIMOのBFTを実施する。 - 前記TXSSは、
DMG Beacon、SSW(Sector Sweep)、Short SSW及びDMG BRP(Beam Refinement Protocol)-TXのいずれかを用いて実行される、
請求項7記載のレスポンダの通信方法。 - 前記BF training type FIELDは、
SISOのBFTを示す場合は0にセットし、
前記SU-MIMOのBFTを示す場合は1にセットし、
MU-MIMOのBFTを示す場合は2にセットする、
請求項7記載のレスポンダの通信方法。 - イニシエータの通信装置であって、以下を含む、
MAC回路は、TXSS終了後、SU-MIMOのBFTを実施するか否かを示すBF training type FIELDを含む第1のフィードバックフレームを生成し、
送信回路は、前記第1のフィードバックフレームをレスポンダに送信し、
受信回路は、前記レスポンダから第2のフィードバックを受信し、
前記MAC回路は、
前記第2のフィードバックフレームが、前記レスポンダから前記TXSSの結果に基づいた、SNRとセクタIDオーダーと、を含む場合、前記SNRと前記セクタIDオーダーとに基づいて、前記レスポンダとのBFTを前記送信回路、前記受信回路を用いて実施する。 - 前記TXSSは、
DMG Beacon、SSW(Sector Sweep)、Short SSW及びDMG BRP(Beam Refinement Protocol)-TXのいずれかを用いて実行される、
請求項10記載のイニシエータの通信装置。 - 前記BF training type FIELDは、
SISOのBFTを示す場合は0にセットし、
前記SU-MIMOのBFTを示す場合は1にセットし、
MU-MIMOのBFTを示す場合は2にセットする、
請求項11記載のイニシエータの通信装置。 - レスポンダの通信装置であって、以下を含む、
受信回路は、TXSS(送信セクタスイープ)終了後、SU-MIMO(Single User Multi-Input Multi-Output)のBFT(ビームフォーミングトレーニング)を実施するか否かを示すBF training type FIELDを含む第1フィードバックフレームをイニシエータから受信し、
MAC回路は、
前記BF training type FIELDが前記SU-MIMOのBFTを実施することを示す場合、前記TXSSの結果に基づいた、SNR(Signal to Noise Ratio)とセクタID(Identifier)オーダーとを含む第2フィードバックを生成する、
送信回路は、
前記第2フィードバックを前記イニシエータに送信し、
前記MAC回路は、
前記送信回路が、前記第2フィードバックを前記イニシエータに送信した後に、前記SNRと前記セクタIDオーダーとに基づいて、前記イニシエータとの間で、前記送信回路と前記受信回路とを用いて、前記SU-MIMOのBFTを実施する。 - 前記TXSSは、
DMG Beacon、SSW(Sector Sweep)、Short SSW及びDMG BRP(Beam Refinement Protocol)-TXのいずれかを用いて実行される、
請求項13記載のレスポンダの通信装置。 - 前記BF training type FIELDは、
SISOのBFTを示す場合は0にセットし、
前記SU-MIMOのBFTを示す場合は1にセットし、
MU-MIMOのBFTを示す場合は2にセットする、
請求項13記載のレスポンダの通信装置。
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