WO2023153176A1 - 通信装置及び通信方法 - Google Patents
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- 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]
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Definitions
- the present disclosure relates to communication devices and communication methods.
- IEEE 802.11be a standard for next-generation wireless local area networks (LANs), which is the successor to IEEE 802.11ax (hereinafter also referred to as “11ax”). , also called “11be”) are under consideration.
- IEEE 802.11ax is also called High Efficiency (HE) and IEEE 802.11be is also called Extremely High Throughput (EHT).
- HE High Efficiency
- EHT Extremely High Throughput
- IEEE 802.11-20/1935r55 Compendium of straw polls and potential changes to the Specification Framework Document - Part 2 IEEE 802.11-20/1399r2, On Joint C-SR and C-OFDMA M-AP Transmission
- a non-limiting embodiment of the present disclosure contributes to providing a communication device and a communication method capable of reducing the amount of information to be fed back in cooperative communication.
- a communication device measures signals received from a plurality of other communication devices to determine a measured value, and based on the measured value, a control circuit that generates feedback information regarding switching of cooperative communication. and a transmission circuit that transmits the feedback information.
- FIG. 4 is a block diagram showing a configuration example of part of an AP according to an embodiment of the present disclosure
- FIG. 4 is a block diagram showing a configuration example of part of a STA according to an embodiment of the present disclosure; Block diagram showing a configuration example of AP according to Embodiment 1 Block diagram showing a configuration example of STA according to Embodiment 1 Diagram showing an example of the Event Request element Diagram showing an example of SNR/RSSI threshold settings for Multi-AP coordination schemes Diagram showing an example of the Event Report element Diagram showing an example of MAP Action frame and MAP Events element Diagram showing an example of STA Statistics request Figure showing an example of STA Statistics report Diagram showing an example of SNR/RSSI threshold settings for Multi-AP coordination schemes A diagram showing an example of the control operation in the situation shown in FIG.
- Multi-Access Point Coordination In 11be, for example, multiple access points (AP: Access Point. Or also called “base station”) cooperate with each terminal (STA: Station. Or, also called “non-AP STA”).
- AP Access Point. Or also called “base station”
- STA Station. Or, also called “non-AP STA”
- MAP Multi-AP
- Coordinated communication hereinafter also referred to as “coordinated communication between base stations
- Multi-AP coordination schemes For coordinated communication in 11be, multiple MAP coordination schemes (Multi-AP coordination schemes) are considered. For example, the following scheme is considered. ⁇ Coordinated Spatial Reuse (hereinafter sometimes referred to as “C-SR”) ⁇ Coordinated OFDMA (hereinafter sometimes referred to as “C-OFDMA”) ⁇ Coordinated Beamforming (hereinafter sometimes referred to as “CBF”) ⁇ Joint Transmissions (hereinafter sometimes referred to as “JT”)
- C-SR Coordinatd Spatial Reuse
- C-OFDMA Coordinatd OFDMA
- CBF Coordinatd Beamforming
- JT Joint Transmissions
- JT includes a method in which multiple cooperating APs transmit the same signal to each other and a method in which multiple cooperating APs transmit different transmission streams.
- a method in which a plurality of cooperating APs transmit transmission streams different from each other is sometimes referred to as Distributed MU-MIMO (hereinafter, “D-MIMO”), for example.
- D-MIMO Distributed MU-MIMO
- JT is defined as a method in which multiple cooperating APs transmit the same signal to each other, and D-MIMO and JT may be defined as different methods.
- the MAP cooperation scheme may be read interchangeably with other terms such as "communication type” or "MAP type”.
- Non-Patent Document 2 describes that system throughput and frequency utilization efficiency are improved by combining C-SR and C-OFDMA.
- MAP transmission feeds back measurement information between multiple nodes (for example, AP and/or STA), so the amount of feedback information may increase.
- an event that switches the MAP coordination scheme is reported based on the measured values of multiple nodes.
- a report of an event that switches the MAP coordination scheme may be described as "MAP coordination scheme switching event report”.
- Figure 1 is a diagram showing an example of the segregation of MAP coordination schemes.
- Figure 1 shows the relationship between the area where the STAs are located and the MAP coordination scheme applied to cooperative communication when the Sharing AP and Shared AP cooperate and communicate with STAs (for example, STA1 and STA2). An example is given.
- Sharing AP is an AP that acquires TXOP (transmission opportunity, channel use (transmission) period) and starts cooperative communication.
- a Shared AP is an AP whose cooperative communication is instructed by the Sharing AP.
- FIG. 1 shows an example of a configuration in which the Shared AP also serves as the Sharing AP, the Sharing AP may be provided separately from the Shared AP.
- STA1 is associated (connected) to Sharing AP (AP1) and is communicating with Sharing AP (AP1).
- STA2 is associated with Shared AP (AP2) and is communicating with Shared AP (AP2).
- MAP coordination schemes there are three types of MAP coordination schemes, C-SR, C-OFDMA, and JT. Note that the MAP coordination schemes that live separately may correspond to the switchable MAP coordination schemes.
- FIG. 2 is a diagram showing an example of received power of each of STA1 and STA2 shown in FIG.
- FIG. 3 is a diagram showing an example of segregation by SNR and RSSI of Multi-AP coordination schemes.
- the RSSI of the connected AP corresponds to the RSSI of the signal received by the STA from the connected AP
- the RSSI of the unconnected AP corresponds to the RSSI of the signal received by the STA from the unconnected AP.
- RSSI is an abbreviation for Received Signal Strength Indicator.
- the SNR of STA1 is expressed as RSSI AP1, STA1 / RSSI AP2, STA1 .
- the SNR of STA2 is expressed as RSSI AP2, STA2 / RSSI AP1, STA2 .
- RSSI APm,STAn indicates the signal strength (for example, RSSI) of the signal received by STAn from APm. Also, hereinafter, the RSSI of the signal received from APm may be described as the RSSI from APm.
- RSSI of connected AP /"RSSI of unconnected AP
- SNR Signal-to-Interference Ratio
- SINR Signal-to-Interference Noise Ratio
- ANIPI Average Noise plus Interference Power Indicator
- STA1 RSSI from a connected AP (eg, AP1 in FIGS. 1 to 3) with respect to RSSI from a non-connected AP (eg, AP2 in FIGS. 1 to 3) Since the ratio is relatively high, the SNR of STA1 is high. On the other hand, in STA2, since the ratio of the RSSI from the connected AP (eg, AP2 in FIGS. 1 to 3) to the RSSI from the non-connected AP (eg, AP1 in FIGS. 1 to 3) is relatively low, STA2 The SNR of STA1 is lower than that of STA1.
- the C-SR area and the C-OFDMA area can be associated by the SNR.
- an area with an SNR greater than or equal to a certain threshold is associated with the C-SR area, and an area with an SNR below a certain threshold is associated with the C-OFDMA area (or JT area). be associated.
- the C-OFDMA area and the JT area may be separated by the total RSSI of each STA.
- a region with a total RSSI greater than or equal to a certain threshold is associated with the C-OFDMA region, and a region with a total RSSI below a certain threshold is associated with the JT region.
- the total RSSI of each STA is the sum of the received powers of the signals received by each STA from APs performing cooperative transmission (eg, AP1 and AP2, and/or Sharing AP and Shared AP), as shown in FIG. may be calculated.
- the horizontal axis is the total RSSI, but instead, the RSSI of the connected AP may be the horizontal axis. That is, instead of performing the threshold determination based on the total RSSI, the threshold determination may be performed using the RSSI of the connected AP, and the JT area and the C-OFDMA area may be associated with each other.
- the threshold provided between the areas of the MAP coordination scheme may be referred to as the determination threshold.
- the threshold to be compared with the SNR may be called SNR Threshold
- RSSI Threshold the threshold to be compared with RSSI
- the determination threshold may be referred to as a MAP coordination scheme switching determination threshold or simply a threshold.
- FIGS. 1 to 3 show examples in which three types of MAP coordination schemes, C-SR, C-OFDMA, and JT, are divided according to SNR and RSSI
- the present disclosure is not limited to this.
- different measurement values for SNR and RSSI may be used for classifying MAP coordination schemes, or either SNR or RSSI may not be used for classifying MAP coordination schemes.
- a MAP coordination scheme different from the three types described above may be included in the MAP coordination scheme to be segregated, or at least one of the three types described above may be included in the MAP coordination scheme to be segregated. It does not have to be
- each STA measures signals received from each AP, and determines whether or not to switch the MAP coordination scheme based on the measured values.
- a Node generates information regarding MAP coordination scheme switching based on measurements of signals received from other Nodes, and reports the generated information.
- a wireless communication system may include, for example, multiple APs 100 and STAs 200 .
- the AP 100 may have, for example, the functions of both the sharing AP and the shared AP, or may have the function of either one.
- FIG. 4A is a block diagram showing a configuration example of part of the AP 100 according to one embodiment of the present disclosure.
- FIG. 4B is a block diagram showing a configuration example of part of the STA 200. As shown in FIG.
- the AP 100 shown in FIG. 4A is an example of a communication device.
- radio transmitting/receiving section 105 transmits a signal for measurement to another communication device (for example, STA 200), and receives cooperative communication (for example, MAP) from the other communication device (for example, STA 200).
- Control section 101 controls cooperative communication with other communication devices (for example, STA 200) based on the feedback information.
- STA 200 shown in FIG. 4B is an example of a communication device.
- a control unit 204 e.g., corresponding to a control circuit
- measures signals received from a plurality of other communication devices e.g., AP 100
- Generating feedback information regarding switching of cooperative communication e.g, MAP
- a wireless transmission/reception unit 201 (corresponding to a transmission circuit, for example) transmits feedback information.
- FIG. 5 is a block diagram showing a configuration example of the AP 100 according to the first embodiment.
- the AP 100 shown in FIG. 5 includes, for example, a control unit 101, a STA control signal generation unit 102, an AP control signal generation unit 103, a transmission signal generation unit 104, a radio transmission/reception unit 105, and a received signal demodulation/decoding unit. and .
- the control unit 101 may control settings of transmission frames (or signals) including, for example, MAP Trigger frames. For example, when the AP 100 is a sharing AP, the control unit 101 may control generation of a control signal (eg, MAP Trigger frame) for another AP 100 (eg, Shared AP). It should be noted that “another AP 100" corresponds to an AP 100 different from its own AP 100. FIG. "Other AP 100" may be a Sharing AP or a Shared AP.
- the transmission frame may be a transmission frame having any one of the frame configurations described later.
- control unit 101 may set control information for the STA 200 or another AP 100, for example.
- control section 101 may configure resource allocation information for each STA 200 and scheduling information such as MCS (Modulation and Coding Scheme).
- MCS Modulation and Coding Scheme
- control unit 101 controls transmission (for example, controls cooperative communication) based on information input from the received signal demodulation/decoding unit 106 (for example, control information notified from the Sharing AP to the Shared AP). (eg, parameters for cooperative communication) may be determined.
- Control section 101 may output, for example, control information including the determined transmission control parameter to STA control signal generation section 102 and AP control signal generation section 103 .
- control unit 101 may control cooperative communication with the STA 200, for example.
- the control unit 101 controls the STA 200 to transmit setting information regarding cooperative communication setting.
- the configuration information may include information used for event reporting (an example of feedback information) from the STA 200 .
- the control unit 101 controls transmission of information (for example, notification information) requesting an event report from the STA 200 to the STA 200 .
- the control unit 101 controls transmission of a measurement signal for measuring communication quality to the STA 200 .
- control unit 101 controls switching of the cooperative communication method (MAP coordination scheme) based on an event report received from the STA 200 .
- MAP coordination scheme the cooperative communication method
- the STA control signal generation section 102 may generate, for example, a control signal (for example, trigger frame) for the STA 200 and output the generated control signal to the transmission signal generation section 104 . Also, STA control signal generation section 102 may generate various signals for STA 200 under the control of control section 101 and output the generated signals to transmission signal generation section 104 .
- a control signal for example, trigger frame
- the AP control signal generation unit 103 may generate, for example, a control signal (eg, MAP Trigger frame) directed to another AP 100.
- a control signal eg, MAP Trigger frame
- AP control signal generation section 103 may generate a control signal based on control information input from control section 101 and information input from received signal demodulation/decoding section 106 .
- Transmission signal generation section 104 for example, for control signals input from STA control signal generation section 102 or AP control signal generation section 103, or data and acknowledgment (ACK)/negative-acknowledgment (NACK), A transmission process may be performed to generate a radio frame (transmission signal). Transmission signal generation section 104 outputs the generated transmission signal to radio transmission/reception section 105 .
- ACK acknowledgment
- NACK negative-acknowledgment
- Radio transmission/reception section 105 performs radio transmission processing such as digital-to-analog (D/A) conversion and up-conversion to a carrier frequency on the transmission signal input from transmission signal generation section 104, for example. A signal is transmitted through the antenna.
- D/A digital-to-analog
- AP 100 when receiving an uplink signal transmitted from STA 200 or a control signal transmitted from another AP 100, AP 100 may operate as follows.
- Radio transmitting/receiving section 105 performs radio reception processing such as carrier frequency down-conversion on the received radio signal, and outputs the signal after radio reception processing to received signal demodulation/decoding section 106 .
- the received signal demodulation/decoding section 106 may perform processing such as autocorrelation processing on the signal input from the radio transmission/reception section 105 to extract the received radio frame.
- received signal demodulation/decoding section 106 for example, included in the extracted radio frame, uplink signal from STA 200 (e.g., response signal, feedback information), or a control signal from another AP 100 (e.g., MAP Trigger frame) may be decoded and demodulated.
- Received signal demodulation/decoding section 106 may output the demodulated control signal to control section 101 , STA control signal generation section 102 , and AP control signal generation section 103 , for example.
- FIG. 6 is a block diagram showing a configuration example of the STA 200 according to the first embodiment.
- the STA 200 shown in FIG. 6 may include, for example, a radio transmission/reception section 201, a received signal demodulation/decoding section 202, a transmission signal generation section 203, and a control section 204.
- the radio transmitting/receiving unit 201 receives a signal transmitted from the AP 100 via an antenna, performs radio reception processing such as down-conversion and analog to digital (A/D) conversion on the received signal, and after the radio reception processing is output to received signal demodulation/decoding section 202 . Further, the radio transmission/reception unit 201 performs radio transmission processing such as D/A conversion and up-conversion to a carrier frequency on the signal input from the transmission signal generation unit 203, for example, and converts the signal after the radio transmission processing into It may be transmitted via an antenna.
- radio reception processing such as down-conversion and analog to digital (A/D) conversion
- A/D analog to digital
- the received signal demodulation/decoding unit 202 may, for example, perform processing such as autocorrelation processing on the signal input from the radio transmission/reception unit 201 to extract the received radio frame.
- the received signal demodulator/decoder 202 may, for example, demodulate and decode a control signal (for example, trigger frame) included in the extracted radio frame to obtain an uplink transmission control parameter.
- the received signal demodulation/decoding section 202 may output the acquired uplink transmission control parameter to the transmission signal generation section 203, for example.
- the received signal demodulation/decoding section 202 outputs the received signal (for example, NDP (Null data PPDU)) to the control section 204 .
- NDP Null data PPDU
- the control unit 204 controls cooperative communication (eg, MAP coordination scheme). For example, the control unit 204 measures a measurement value such as CSI (Channel State Information) and/or RSSI based on a received signal (for example, NDP (Null data PPDU)). The control unit 204 generates feedback information regarding switching of cooperative communication (for example, MAP coordination scheme) based on the measured values.
- CSI Channel State Information
- RSSI Signal to Interference Signal
- control unit 204 compares the threshold and the measured value included in the setting information received from another communication device (eg, Sharing AP), and determines whether or not the MAP coordination scheme is switched based on the comparison result.
- Control section 204 may generate feedback information indicating the determination result and output the generated feedback information to transmission signal generation section 203 .
- Transmission signal generation section 203 performs transmission signal processing on an uplink signal (for example, a signal including feedback information) based on, for example, an uplink transmission control parameter input from received signal demodulation/decoding section 202, A frame (transmission signal) may be generated.
- the transmission signal generation unit 203 outputs the generated transmission signal to the radio transmission/reception unit 201, for example.
- the judgment threshold is notified by the Event Request element, and the MAP coordination scheme switching is reported by the Event Report element.
- Notification of the determination threshold by the Event Request element is an example of transmission of setting information regarding the threshold.
- a report of MAP coordination scheme switching by an Event Report element is an example of sending feedback information regarding MAP coordination scheme switching.
- notification of the determination threshold may be regarded as an example of a request for a MAP coordination scheme switching event.
- the MAP coordination scheme switching report may be regarded as an example of the MAP coordination scheme switching event Report.
- FIG. 7A is a diagram showing an example of an Event Request element.
- FIG. 7B is a diagram showing an example of SNR/RSSI threshold settings for Multi-AP coordination schemes.
- FIG. 7A exemplarily shows an Event Request element of IEEE P802.11-REVme TM /D1.0, 9.4.2.66.
- FIG. 7B shows two decision thresholds set corresponding to the segregation of MAP coordination schemes similar to the example shown in FIG.
- 222 is defined as “Multi-AP Feedback” in “Event Type”.
- Event Request corresponding to “Multi-AP Feedback” may be defined. Note that defining “Multi-AP Feedback” for “222” in “Event Type” corresponds to matching "222” and “Multi-AP Feedback” in “Event Type”. good.
- Event Request includes, for example, “Subelement ID”, “SNR Threshold”, and “RSSI Threshold”, as shown in FIG. 7A. Also, the "Subelement ID” includes identification information defined in association with the number of "SNR Threshold” and the number of "RSSI Threshold”.
- the Event Request element may be included in the Event Request frame.
- the Event Request frame is specified, for example, in IEEE P802.11-REVme TM /D1.0, 9.6.13.2.
- a decision threshold eg, SNR Threshold and/or RSSI Threshold
- a decision threshold may be provided for each of multiple frequency bands.
- a decision threshold may be provided for each 20 MHz bandwidth.
- the determination threshold may be changed depending on the Device Class (eg, Class A/B) of the Node.
- a threshold set with multiple MAP coordination scheme candidates may be provided. If a threshold set with multiple MAP coordination scheme candidates is provided, each Node may be configured to select a threshold from among the threshold sets.
- one SNR threshold is provided to indicate the boundary between the C-SR area and the C-OFDMA area or JT area. Also, as shown in FIG. 7B, one RSSI Threshold indicating the boundary between the C-OFDMA area and the JT area is provided. In this way, a decision threshold can be defined.
- FIG. 8 is a diagram showing an example of the Event Report element.
- FIG. 8 illustratively shows an example based on the Event Request element of IEEE P802.11-REVme TM /D1.0, 9.4.2.67.
- Event Report is defined corresponding to "Event Type”. "Event Report” includes, for example, “Subelement ID” and “Indicator ("Indicators that the threshold is exceeded” in FIG. 8)", as shown in FIG.
- Subelement ID may be the same as the definition in Event Request (eg, FIG. 7A).
- Subelement ID includes identification information defined in association with the number of "SNR Threshold” and the number of "RSSI Threshold”.
- “Indicator” contains the judgment result based on the judgment threshold included in the Event Request. For example, if one SNR Threshold and one RSSI Threshold are included in the Event Request, the Indicator includes information indicating whether the measured SNR exceeds the SNR Threshold (for example, indicator) and the measured RSSI has exceeded the RSSI Threshold (eg, indicator).
- the number of Indicators is the sum of the number of SNR Thresholds and the number of RSSI Thresholds defined by Subelement ID.
- the determination of whether or not the measured value (for example, the measured SNR and/or the measured RSSI) exceeds the threshold can be regarded as the determination of whether or not the MAP coordination scheme has been switched.
- the determination that the measured SNR did not exceed the SNR Threshold at one point in time but exceeded the SNR Threshold at the next point in time indicates that the MAP coordination scheme is in C-SR. It may be regarded as a determination to switch.
- An Event Report element may be included in an Event Report frame.
- the Event Report frame is specified, for example, in IEEE P802.11-REVme TM /D1.0, 9.6.13.3.
- the judgment threshold is notified by the Event Request element, and the MAP coordination scheme switching is reported by the Event Report element.
- the MAP coordination scheme switching instead of feeding back measured values, information regarding MAP coordination scheme switching can be fed back, so the amount of information to be fed back can be reduced.
- System throughput can be improved by reducing opportunities to feed back measured values and the amount of information to be fed back.
- frames and elements for MAP coordination scheme switching events are defined, and MAP coordination scheme switching events are requested and reported by the defined frames and elements.
- the newly defined frame and element are exemplarily referred to as MAP Action frame and MAP Events element, respectively.
- FIG. 9 is a diagram showing an example of the MAP Action frame and MAP Events element.
- the MAP Action field defines actions related to MAP.
- the MAP-related operation includes an operation of requesting a MAP event and an operation of reporting a MAP event.
- the content of MAP Events element may be Event Request similar to Event Request shown in Embodiment 1.
- the MAP events element may include "Subelement ID”, "SNR Threshold”, and "RSSI Threshold”.
- the content of MAP Events element may be Event Report similar to Event Report shown in Embodiment 1.
- the MAP Events element may include "Subelement ID” and "Indicator ("Indicators that the threshold is exceeded” in FIG. 9)".
- the decision threshold is notified by the MAP Event element defined in the MAP Action frame, and the MAP coordination scheme switching is reported by the MAP Event element defined in the MAP Action frame.
- Notification of the determination threshold by the MAP Event element defined in the MAP Action frame is an example of transmission of setting information regarding the threshold.
- Reporting of MAP coordination scheme switching by the MAP Event element defined in the MAP Action frame is an example of sending feedback information regarding MAP coordination scheme switching.
- a MAP Action frame and a MAP Events element are defined, and a request for a MAP coordination scheme switching event (for example, notification of a determination threshold) and a report for a MAP coordination scheme switching event are performed.
- a request for a MAP coordination scheme switching event for example, notification of a determination threshold
- a report for a MAP coordination scheme switching event are performed.
- a MAP coordination scheme switching event is requested by the STA Statistics request included in the Radio Measurement Request frames. Further, in the third embodiment, the MAP coordination scheme switching event is reported by the STA Statistics report included in the Radio Measurement Report frames.
- Radio Measurement Request frames are specified in IEEE P802.11-REVme TM /D1.0, 9.6.6.2, and STA Statistics request are specified in IEEE P802.11-REVme TM /D1.0, 9.4.2.20.9. Defined. Radio Measurement Report frames are specified in IEEE P802.11-REVme TM /D1.0, 9.6.6.3, and STA Statistics report is specified in IEEE P802.11-REVme TM /D1.0, 9.4.2.21.9. Defined.
- FIG. 10A is a diagram showing an example of the STA Statistics request.
- FIG. 10B is a diagram showing an example of a STA Statistics report.
- MAP Events Counters is defined as a Counters Group for MAP in the STA Statistics request.
- "Triggered Reporting subelement” contains "dot11MAP EventsCount Threshold", which is an event threshold for MAP (an example of a judgment threshold). included.
- the content of "dot11MAP EventsCount Threshold” may be an Event Request similar to the Event Request shown in the first embodiment.
- 'dot11MAP EventsCount Threshold' may include 'Subelement ID', 'SNR Threshold', and 'RSSI Threshold'.
- the Measurement Report field includes "Statistics Group Data".
- the contents of "Statistics Group Data” may be an Event Report similar to the Event Report shown in the first embodiment.
- "Statistics Group Data” may include "Subelement ID” and "Indicator ("Indicators that the threshold is exceeded” in FIG. 8)".
- a MAP coordination scheme switching event is requested by the STA Statistics request included in the Radio Measurement Request, and a MAP coordination scheme switching event is reported by the STA Statistics report included in the Radio Measurement Report frames.
- Fig. 11 is a diagram showing an example of SNR/RSSI threshold settings for Multi-AP coordination schemes.
- FIG. 11 shows an example in which STA1 is located in the C-SR area and STA2 moves from the C-SR area to the C-OFDMA area.
- the position of STA1 on the plane defined by the SNR and total RSSI illustrated in FIG. 11 corresponds to the position indicated by the SNR and total RSSI based on the measurement values measured at STA1.
- points indicating STA1 correspond to points indicated by the SNR and total RSSI based on the measurement values measured at STA1.
- STA2 is similar to STA1.
- the movement of the point indicating STA2 from the C-SR area to the C-OFDMA area may be caused by a physical change in the location of STA2, or by a change in the communication environment around STA2. , STA2 measurement values, or a combination of these factors.
- FIG. 12 is a diagram showing an example of control actions in the situation shown in FIG.
- FIG. 13 is a diagram showing an example of feedback information for each MAP coordination scheme.
- the horizontal axis of FIG. 12 indicates the time axis.
- an Event Request frame is sent from Sharing AP (AP1) to STA1 and STA2.
- the Event Request frame notifies STA1 and STA2 of the MAP coordination scheme switching decision threshold.
- Event Request frame is an Event Request frame defined in IEEE P802.11-REVme TM /D1.0, 9.6.13.2 in Embodiment 1, and a MAP Action frame in Embodiment 2, In Embodiment 3, they are Radio Measurement Request frames.
- AP1 After the Sharing AP (AP1) sends the Event Request frame to STA1 and STA2, the measurement phase starts.
- AP1 transmits NDPA (Null data PPDU Announcement) for MAP to Shared AP (AP2), STA1, and STA2.
- NDPA Null data PPDU Announcement
- the NDPA for MAP specifies the specifications of the measurements each STA performs upon receiving the NDP (Null data PPDU) sent from each AP (AP1 and AP2).
- AP1 and AP2 each transmit an NDP (in FIG. 12, MAP NDP1 and MAP NDP2 as examples).
- STA1 and STA2 receive the NDPs transmitted by AP1 and AP2, respectively, and measure the CSI (Channel State Information) of the NDPs received from AP1 and AP2, respectively.
- CSI Channel State Information
- measurements may include SNR and/or RSSI, and the like.
- Sharing AP sends a MAP Poll Trigger to each STA requesting feedback of the CSI measured by the STA.
- Sharing AP (AP1) receives MAP BFR, which is BFR (beamforming report) for MAP, from each STA.
- the MAP BFR contains CSI information.
- each STA's connection destination AP is instructed to receive CSI. That is, AP1 receives CSI from STA1 connected to AP1, and AP2 receives CSI from STA2 connected to AP2.
- FIG. 12 shows an example in which Sharing AP (AP1) collectively transmits MAP Poll Triggers to STA1 and STA2, the present disclosure is not limited to this.
- each Shared AP AP1 and AP2 sends a MAP Poll Trigger to the STAs connected to each Shared AP and receives responses (e.g., CSI) from the STAs connected to each Shared AP2.
- responses e.g., CSI
- a stepwise control may be used.
- AP1 may send a MAP Poll Trigger to STA1 and receive a response from STA1
- AP2 may send a MAP Poll Trigger to STA2 and receive a response from STA1.
- each AP transmits a Basic Trigger frame
- the STA that receives the Basic Trigger frame measures the CSI of the received Basic Trigger frame
- each AP may be the control to receive the CSI measured by the STA.
- STA2 changes to the C-OFDMA area in the Event Report frame for Sharing AP (AP1). Report switching events. As shown in FIG. 11, STA1 does not switch the MAP coordination scheme, so STA1 does not need to transmit the Event report frame as shown in FIG.
- Event Report frame is an Event Report frame defined in IEEE P802.11-REVme TM /D1.0, 9.6.13.3 in Embodiment 1, and a MAP Action frame in Embodiment 2, In Embodiment 3, it is a Radio Measurement Report frame.
- FIG. 12 shows an example in which the STA transmits an event report once when the MAP coordination scheme is switched
- STAs may send limited event reports when measurements change by more than a specified relative threshold within the same MAP coordination scheme.
- an event report indicating a change equal to or greater than a specified relative threshold within the MAP coordination scheme may be transmitted.
- the sharing AP that received the event report from STA2 recognizes that STA2 is located in the C-OFDMA area. As shown in FIG. 13, C-OFDMA does not use feedback information. Therefore, in the measurement phase after AP1 receives the event report, STA2 is located in the C-OFDMA region, so NDP sounding (measurement) in STA2 and feedback from STA2 are omitted.
- the STA feeds back limited information necessary for the post-switching MAP coordination scheme.
- this feedback it is possible to reduce the information amount of the measured value feedback and improve the system throughput.
- the opportunity for sending and receiving the Event Report frame is not limited to one, and may be multiple times for one sending and receiving of the Event Request frame.
- the STA may further send an Event Report frame for the first Event Request frame after the second measurement phase in FIG.
- Embodiment 4 takes a form in which a hysteresis function is provided in the conditions for reporting a MAP coordination scheme switching event.
- FIG. 14 is a diagram showing an example of setting different thresholds depending on the switching direction of the MAP coordination scheme.
- the threshold in the direction of switching from the C-SR region to the C-OFDMA region (SNR Threshold#2) and the threshold in the direction of switching from the C-OFDMA region to the C-SR region (SNR Threshold#1 ) are provided, respectively.
- the threshold in the direction of switching from the C-SR area to the C-OFDMA area may be set lower than the threshold in the direction of switching from the C-OFDMA area to the C-SR area.
- the thresholds may be notified by, for example, an Event Request frame.
- FIG. 15 is a diagram showing an example of MAP coordination scheme switching determination.
- the horizontal axis of FIG. 15 represents time, and the vertical axis represents measured values (eg, SNR or RSSI).
- FIG. 15 shows the time-varying measurements and the thresholds to which the measurements are compared.
- the number of times the measured value exceeds the switching threshold may be counted multiple times at regular intervals, and the MAP coordination scheme switching event report may be transmitted when the counted number of times is equal to or greater than the predetermined number of times.
- the measured value measures the duration of the state exceeding the switching threshold, and when the measured time is equal to or longer than the specified time, the MAP coordination scheme switching event report may be transmitted.
- the MAP coordination scheme switching event report may be transmitted.
- by determining whether to report a MAP coordination scheme switching event based on the number of times the measurement exceeds the switching threshold or the length of time that the measurement exceeds the switching threshold. can improve reliability.
- the predetermined number of times to be compared with the counted number may differ depending on the switching direction of the MAP coordination scheme.
- the specified time which is compared with the time during which the measured value remains above the switching threshold, may differ depending on the switching direction of the MAP coordination scheme.
- the number of event reports can be suppressed and the reports can be limited to highly reliable reports. Also, by suppressing the number of event reports, the amount of feedback information can be reduced. By reducing the amount of feedback information, system throughput can be improved.
- hysteresis function an example of setting different thresholds depending on the switching direction of the MAP coordination scheme, an example of counting the number of times the measured value exceeds the switching threshold, and an example where the measured value continues to exceed the switching threshold
- these hysteresis functions may be used in combination.
- different thresholds may be set according to the switching direction of the MAP coordination scheme, and the number of times the measured value exceeds the set threshold may be counted. Then, whether or not the MAP coordination scheme switching event report has been transmitted may be determined depending on whether or not the counted number of times is equal to or greater than a predetermined number of times. In this case, the predetermined number of times to be compared with the counted number may differ depending on the switching direction of the MAP coordination scheme.
- information regarding the hysteresis function may be set in advance. It may be included in the Event Request frame shown in . . . 3, etc.
- the fifth embodiment takes the form of receiving a report on the MAP coordination scheme from the Node.
- the sharing AP requests MAP coordination scheme switching request collection and/or NDP sounding request collection using a trigger frame.
- a trigger frame requesting MAP coordination scheme switching request collection and/or NDP sounding request collection is an example of notification information requesting feedback information.
- FIG. 16 is a diagram showing a definition example of the MAP Trigger frame format and Trigger Type subfield according to the fifth embodiment.
- the values indicating MAP coordination scheme switching request collection and NDP sounding request collection are defined as 8 and 9, respectively. be done.
- Trigger Type When Trigger Type is set to MAP coordination scheme switching request collection, it means collecting reports on the presence or absence of MAP coordination scheme switching events from each of multiple nodes.
- Trigger Type When Trigger Type is set to NDP sounding request collection, it means to collect NDP sounding and NDP sounding feedback request reports from multiple nodes.
- Trigger Types are defined in the example of FIG. 16, either one of MAP coordination scheme switching request collection or NDP sounding request collection may be defined.
- each Node responds with either NDP feedback report and/or multiplexed with Control frames including Data frames, Ack frames, BlockAck frames, etc. may
- FIG. 17 is a diagram showing an example of the operation when the Trigger Type is MAP coordination scheme switching request collection.
- FIG. 18 is a diagram showing an example of operation when Trigger Type is NDP sounding request collection.
- the horizontal axes in FIGS. 17 and 18 indicate the time axis.
- the operation of the measurement phase in FIGS. 17 and 18 is the same as the operation of the measurement phase shown in Embodiments 1-3.
- the two measurement phases are the first measurement phase (described as measurement phase [first time] in FIG. 17) and the second measurement phase (described as measurement phase [second time] in FIG. 17).
- the present disclosure is not limited thereto.
- the first measurement phase and the second measurement phase may be respectively replaced with the measurement phase at a certain time and the measurement phase at the next time.
- the Sharing AP may transmit an Event Request frame before the measurement phase [first time], as in FIG.
- STA1 and STA2 report whether or not the MAP coordination scheme is switched.
- STA1 reports that there is no switching of the MAP coordination scheme from the C-SR region because it is assumed that there is no switching of the MAP coordination scheme of STA1.
- the MAP coordination scheme of STA2 is assumed to switch from the C-SR area to the C-OFDMA area, so STA2 reports that there is a switch of the MAP coordination scheme.
- STA1 and STA2 each report the presence or absence of NDP sounding in response to the MAP Trigger frame transmitted from AP1.
- STA1 is located in the C-SR region. Since C-SR requires NDP sounding, STA1 reports that there is NDP sounding. In the example of FIG. 18, it is assumed that STA2 is located in the C-OFDMA area. Since C-OFDMA does not require NDP sounding, STA2 reports no NDP sounding.
- the sharing AP receives a report on the MAP coordination scheme from each STA, and according to an example of feedback information for each MAP coordination scheme shown in FIG. 13, NDP sounding and its feedback are unnecessary. , the NDP sounding and its feedback actions can be omitted. Omitting the NDP sounding may correspond to omitting the NDP measurement.
- responses to the MAP Trigger frames in FIGS. 17 and 18 show examples in which each STA feeds back at the same time (or within the same time interval) using the NDP feedback report (NFR), but the present disclosure is not limited to
- feedback may be provided by any frame multiplexed with Data frames or Control frames including Ack frames, BlockAck frames, and the like.
- the Trigger frame receives a report on the MAP coordination scheme (for example, a report on the MAP coordination scheme switching request collection request), thereby reducing the amount of feedback information of the measurement value and increasing the system throughput. can be improved.
- a report on the MAP coordination scheme for example, a report on the MAP coordination scheme switching request collection request
- parameters requested in Link Adaptation include information on the recommended MAP coordination scheme.
- FIG. 19 is a diagram showing an example of the operation of Link Adaptation according to the sixth embodiment.
- the horizontal axis of FIG. 19 indicates the time axis.
- a Beacon frame contains an Event Request element.
- the Event Request element may be similar to the example shown in the first embodiment.
- the Beacon frame may include "Subelement ID”, "SNR Threshold”, and "RSSI Threshold” as shown in FIG. 7A.
- the decision threshold is notified to each node by the Event Request element included in the Beacon frame.
- FIG. 19 shows an example in which the Event Request element is included in the Beacon frame. may be included and notified.
- Node1 sends an MCS (Modulation and Coding Scheme) request (MRQ) to Node2.
- MCS Modulation and Coding Scheme
- MRQ Modulation and Coding Scheme
- Node2 sends MCS feedback (MFB) as a response to the MCS request.
- MCS feedback includes information on recommended MCS (Modulation and Coding Scheme) and recommended MAP coordination scheme.
- the area B25-B27 contains information on the recommended MAP coordination scheme.
- Node1 receives MCS (Modulation and Coding Scheme) feedback containing information on the recommended MAP coordination scheme, determines the MAP coordination scheme based on the information on the recommended MAP coordination scheme, and sends data to Node2 using the MAP coordination scheme. send.
- MCS Modulation and Coding Scheme
- the MAP coordination scheme can be efficiently controlled, the amount of feedback information of measured values can be reduced, and the system throughput can be improved. It becomes possible.
- Event Request element configuration shown in FIG. 7A may be given a name different from "Event Request element".
- Multi-AP Feedback is defined as “222" in Event Type, but a value different from “222” may be defined in "Multi-AP Feedback”.
- the configurations of the frame, element, field, subfield, etc. in each of the above-described embodiments are examples, and the present disclosure is not limited to the above-described examples.
- at least one element may be omitted from the above-described frame configuration, or the above-described frame configuration may include elements that are not included in the configuration.
- the AP that instructs cooperative communication and the AP that is instructed to cooperative communication are described using the terms “Sharing AP” and “Shared AP”, respectively. terms may be used.
- the description is based on the 11be format as a non-limiting example, but the format to which one embodiment of the present disclosure can be applied is not limited to the 11be format.
- An embodiment of the present disclosure may be applied, for example, to IEEE 802.11bd (NGV (Next Generation V2X)), which is the next-generation standard of IEEE 802.11p, which is an in-vehicle standard.
- NVG Next Generation V2X
- Each functional block used in the description of the above embodiments is partially or wholly realized as an LSI, which is an integrated circuit, and each process described in the above embodiments is partially or wholly implemented as It may be controlled by one LSI or a combination of LSIs.
- An LSI may be composed of individual chips, or may be composed of one chip so as to include some or all of the functional blocks.
- the LSI may have data inputs and outputs.
- LSIs are also called ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized with a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may be used.
- FPGA Field Programmable Gate Array
- reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may be used.
- the present disclosure may be implemented as digital or analog processing.
- a communication device may include a radio transceiver and processing/control circuitry.
- a wireless transceiver may include a receiver section and a transmitter section, or functions thereof.
- a wireless transceiver (transmitter, receiver) may include an RF (Radio Frequency) module and one or more antennas.
- RF modules may include amplifiers, RF modulators/demodulators, or the like.
- Non-limiting examples of communication devices include telephones (mobile phones, smart phones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still/video cameras, etc.).
- digital players digital audio/video players, etc.
- wearable devices wearable cameras, smartwatches, tracking devices, etc.
- game consoles digital book readers
- telehealth and telemedicine (remote health care/medicine prescription) devices vehicles or mobile vehicles with communication capabilities (automobiles, planes, ships, etc.), and combinations of the various devices described above.
- Communication equipment is not limited to portable or movable equipment, but any type of equipment, device or system that is non-portable or fixed, e.g. smart home devices (household appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.), vending machines, and any other "Things" that can exist on the IoT (Internet of Things) network.
- smart home devices household appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.
- vending machines and any other "Things” that can exist on the IoT (Internet of Things) network.
- Communication includes data communication by cellular system, wireless LAN system, communication satellite system, etc., as well as data communication by a combination of these.
- Communication apparatus also includes devices such as controllers and sensors that are connected or coupled to communication devices that perform the communication functions described in this disclosure. Examples include controllers and sensors that generate control and data signals used by communication devices to perform the communication functions of the communication device.
- Communication equipment also includes infrastructure equipment, such as base stations, access points, and any other equipment, device, or system that communicates with or controls the various equipment, not limited to those listed above. .
- a communication device measures signals received from a plurality of other communication devices to determine a measured value, and based on the measured value, a control circuit that generates feedback information regarding switching of cooperative communication. and a transmission circuit that transmits the feedback information.
- control circuit determines whether or not to switch the cooperative communication by comparing the measured value with a threshold.
- the communication device includes a receiving circuit that receives setting information regarding the threshold.
- the setting information is included in an Event Request element, and the feedback information is included in an Event Report element.
- the receiving circuit receives the setting information included in the MAP Event element defined in the MAP Action frame, and the transmitting circuit receives the setting information included in the MAP Event element defined in the MAP Action frame. Send the feedback information that is received.
- the receiving circuit receives the setting information included in the STA statistics request included in the Radio Measurement Request, and the transmitting circuit receives the setting information included in the STA statistics report included in the Radio Measurement Report. Submit feedback information.
- control circuit generates the feedback information based on the measurements at multiple points in time.
- control circuit determines whether to switch from a first cooperative communication method to a second cooperative communication method by comparing the measured value with a first threshold. Then, the presence or absence of switching from the second cooperative communication method to the first cooperative communication method is determined by comparing the measured value with a second threshold different from the first threshold.
- the communication device includes a receiving circuit that receives notification information requesting the feedback information, and the control circuit generates the feedback information in response to the request.
- a type is set in the notification information, and the receiving circuit receives the notification information indicating that the type requests feedback information regarding switching of the cooperative communication.
- a type is set in the notification information, and the receiving circuit receives the notification information indicating that the type requests feedback information regarding measurements for the cooperative communication.
- the transmission circuit transmits the feedback information using any one of NDP feedback report, data frame, and control frame.
- the feedback information is included in the parameters requested in link adaptation.
- a communication device measures signals received from a plurality of other communication devices to determine a measurement value, and provides feedback information regarding switching of cooperative communication based on the measurement value. generate and transmit said feedback information;
- An embodiment of the present disclosure is useful for wireless communication systems.
- control unit 102 control signal generation unit for STA 103 control signal generation unit for AP 104, 203 transmission signal generation unit 105, 201 radio transmission/reception unit 106, 202 received signal demodulation/decoding unit 200 STA
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Abstract
Description
11beでは、例えば、複数のアクセスポイント(AP:Access Point。又は、「基地局」とも呼ばれる)が協調して各端末(STA:Station。又は、「non-AP STA」とも呼ばれる)との間においてデータを送受信するMulti-AP(以下、「MAP」と呼ぶ) coordination(以下「協調通信」又は「基地局間協調通信」とも呼ぶ)の適用が検討されている。
・Coordinated Spatial Reuse(以下、「C-SR」と表記することがある)
・Coordinated OFDMA(以下、「C-OFDMA」と表記することがある)
・Coordinated Beamforming(以下、「CBF」と表記することがある)
・Joint Transmissions(以下、「JT」と表記することがある)
本実施の形態に係る無線通信システムは、例えば、複数のAP100、及び、STA200を含んでよい。AP100は、例えば、Sharing AP及びShared APの双方の機能を備えてもよいし、何れか一方の機能を備えてもよい。
[AP100の構成例]
図5は、本実施の形態1に係るAP100の構成例を示すブロック図である。図5に示すAP100は、例えば、制御部101と、STA向け制御信号生成部102と、AP向け制御信号生成部103と、送信信号生成部104と、無線送受信部105と、受信信号復調・復号部106と、を含んでよい。
図6は、本実施の形態1に係るSTA200の構成例を示すブロック図である。図6に示すSTA200は、例えば、無線送受信部201と、受信信号復調・復号部202と、送信信号生成部203と、制御部204と、を含んでよい。
本実施の形態2に係るAP及びSTAの構成は、実施の形態1と同様でよい。
本実施の形態3に係るAP及びSTAの構成は、実施の形態1と同様でよい。
上述した実施の形態1~3における動作例について説明する。
本実施の形態4に係るAP及びSTAの構成は、実施の形態1と同様でよい。
本実施の形態5に係るAP及びSTAの構成は、実施の形態1と同様でよい。
本実施の形態6に係るAP及びSTAの構成は、実施の形態1と同様でよい。
なお、上述した各実施の形態において、各フレームの構成の一例について説明したが、通知される情報は、上述した実施の形態において示した情報に限定されず、例えば、他の情報が追加されてもよく、もしくは、定義された情報の少なくとも一部が削除されてもよい。
101,204 制御部
102 STA向け制御信号生成部
103 AP向け制御信号生成部
104,203 送信信号生成部
105,201 無線送受信部
106,202 受信信号復調・復号部
200 STA
Claims (14)
- 複数の他の通信装置から受信した信号を測定して測定値を決定し、前記測定値に基づいて協調通信の切り替えに関するフィードバック情報を生成する制御回路と、
前記フィードバック情報を送信する送信回路と、
を具備する通信装置。 - 前記制御回路は、前記測定値と閾値とを比較することによって、前記協調通信の切り替えの有無を決定する、
請求項1に記載の通信装置。 - 前記閾値に関する設定情報を受信する受信回路を備える、
請求項2に記載の通信装置。 - 前記設定情報は、Event Request elementに含まれ、
前記フィードバック情報は、Event Report elementに含まれる、
請求項3に記載の通信装置。 - 前記受信回路は、MAP Action frameにおいて規定されたMAP Event elementに含まれる前記設定情報を受信し、
前記送信回路は、MAP Action frameにおいて規定されたMAP Event elementに含まれる前記フィードバック情報を送信する、
請求項3に記載の通信装置。 - 前記受信回路は、Radio Measurement Requestに含まれるSTA statistics requestに含まれる前記設定情報を受信し、
前記送信回路は、Radio Measurement Reportに含まれるSTA statistics reportに含まれる前記フィードバック情報を送信する、
請求項3に記載の通信装置。 - 前記制御回路は、複数の時点における前記測定値に基づいて、前記フィードバック情報を生成する、
請求項1に記載の通信装置。 - 前記制御回路は、前記測定値と第1の閾値とを比較することによって、第1の協調通信の方法から第2の協調通信の方法への切り替えの有無を決定し、前記測定値と前記第1の閾値と異なる第2の閾値とを比較することによって、前記第2の協調通信の方法から前記第1の協調通信の方法への切り替えの有無を判定する、
請求項2に記載の通信装置。 - 前記フィードバック情報を要求する通知情報を受信する受信回路を備え、
前記制御回路は、前記要求に応じて、前記フィードバック情報を生成する、
請求項1に記載の通信装置。 - 前記通知情報には、タイプが設定され、
前記受信回路は、前記タイプが前記協調通信の切り替えに関するフィードバック情報を要求することを示す前記通知情報を受信する、
請求項9に記載の通信装置。 - 前記通知情報には、タイプが設定され、
前記受信回路は、前記タイプが前記協調通信のための測定に関するフィードバック情報を要求することを示す前記通知情報を受信する、
請求項9に記載の通信装置。 - 前記送信回路は、NDP feedback report、Data frame、control frameの何れか1つを用いて、前記フィードバック情報を送信する、
請求項9に記載の通信装置。 - 前記フィードバック情報は、リンクアダプテーションにおいて要求するパラメータの中に含まれる、
請求項1に記載の通信装置。 - 通信装置が、
複数の他の通信装置から受信した信号を測定して測定値を決定し、
前記測定値に基づいて協調通信の切り替えに関するフィードバック情報を生成し、
前記フィードバック情報を送信する、
通信方法。
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