WO2022050058A1 - 無線通信装置および無線通信端末 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present technology relates to wireless communication devices and wireless communication terminals, and particularly to wireless communication devices and wireless communication terminals capable of reducing data transmission delay.
- CBF Coordinate Beamforming
- MIMO Multi Input Multi Output
- a wireless LAN Local Area Network
- RTA Real Time Application
- other APs always suppress interference with the STA that transmits RTA packets. It is desirable to do it.
- This technology was made in view of such a situation, and makes it possible to reduce the data transmission delay.
- the wireless communication device of the first aspect of the present technology includes a wireless communication unit that transmits a first data frame containing a first data signal to a wireless terminal, and the wireless terminal before transmission of the first data frame. It is provided with a communication control unit that controls transmission of a suppression request signal that requests other wireless communication devices to suppress interference with the other.
- the wireless communication device of the second aspect of the present technology is a wireless communication device that transmits a first data frame containing a first data signal to a first wireless terminal before transmission of the first data frame from another wireless communication device.
- a wireless communication unit that receives a transmitted suppression request signal requesting interference suppression to the first wireless terminal, and a communication control unit that determines whether or not to perform interference suppression based on the suppression request signal. To prepare for.
- the wireless communication terminal of the third aspect of the present technology has a wireless communication unit that transmits a data frame including a data signal to the first wireless communication device, and a second radio that suppresses interference before transmission of the data frame. It is provided with a communication control unit that controls the transmission of the suppression request signal requested from the communication device.
- the wireless communication device of the fourth aspect of the present technology is a wireless communication unit that receives an interference request signal requesting interference suppression from a first wireless communication terminal that transmits a first data frame including a first data signal. , When transmitting a second data frame different from the first data frame to the second wireless communication terminal, the first wireless communication terminal uses the first data frame based on the interference request signal. It is provided with a communication control unit for determining whether or not to suppress the interference with another wireless communication device that transmits the data.
- the wireless communication terminal of the fifth aspect of the present technology is a wireless communication device that shares a cooperative information sharing signal that shares a request for suppression of interference with other wireless communication terminals that transmit a first data frame including a first data signal.
- the communication unit receives from the communication unit and the second data frame different from the first data frame is transmitted to the wireless communication device, the other wireless communication terminal uses the first data frame based on the cooperative information sharing signal. It is provided with a communication control unit for determining whether or not to suppress the interference with another wireless communication device that transmits the data frame.
- a first data frame containing a first data signal is transmitted to a wireless terminal. Then, before the transmission of the first data frame, the transmission of the suppression request signal that requests the other wireless communication device to suppress the interference with the wireless terminal is controlled.
- the first data frame containing the first data signal is transmitted from another wireless communication device that transmits the first data frame to the first wireless terminal before the transmission of the first data frame.
- a suppression request signal requesting interference suppression to the first wireless terminal is received. Then, based on the suppression request signal, it is determined whether or not to perform the interference suppression.
- a data frame including a data signal is transmitted to the first wireless communication device. Then, before the transmission of the data frame, the transmission of the suppression request signal that requests the second wireless communication device to suppress the interference is controlled.
- an interference request signal requesting interference suppression is received from a first wireless communication terminal that transmits a first data frame including a first data signal, and a second wireless communication terminal is used.
- the first wireless communication terminal transmits the first data frame based on the interference request signal. It is determined whether or not to suppress the interference with the device.
- a coordinated information sharing signal sharing a request for suppression of interference to another wireless communication terminal that transmits a first data frame including the first data signal is received from the wireless communication device.
- the other wireless communication terminal transmits the first data frame based on the cooperative information sharing signal. It is determined whether or not to suppress the interference with other wireless communication devices.
- FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present technology.
- the solid line arrow indicates that the devices are connected to each other, and the broken line arrow indicates that power is exchanged between the devices.
- AP Access Point
- STA Selection
- the wireless communication system of FIG. 1 is configured by connecting AP1 and AP2 by wired communication or wireless communication.
- the wireless communication device 11-1 and the wireless communication device 11-2 are devices that operate as AP1 and AP2, respectively.
- the wireless communication system is configured by connecting STA1 and STA2 to AP1 by wireless communication and connecting STA3 and STA4 to AP2 by wireless communication.
- the wireless communication terminals 12-1 to 12-4 are devices that operate as STA1 to STA4, respectively.
- STA1 and STA2 connected to AP1 by wireless communication belong to the same cell (BSS) as AP1 and are called STAs under AP1.
- STA3 and STA4 connected to AP2 by wireless communication belong to the same cell (BSS) and are called STAs under AP2.
- the target system configuration is not limited to the example of FIG. 1, and if there are a plurality of APs for which connection has been established and STA is connected as a peripheral terminal to each AP, It may have any configuration.
- the suppression request signal is a signal that the AP requests other APs to suppress interference with the STA of the destination of the RTA packet. It is characterized by controlling transmission.
- RTA packets are data packets that require at least one of low latency and high reliability.
- the minimum unit of data transmitted by the AP is referred to as a "packet", and the data obtained by connecting a plurality of packets and adding MAC Header and Preamble is referred to as a "data frame”. Transmission of a data frame is referred to as "data transmission”. The names are not limited to these.
- suppressing interference is referred to as "generating NULL", but this does not only indicate that interference is spatially eliminated, but also lowers the transmission power value or lowers the transmission power value. It is intended to mean an operation of reducing the interference power by applying beamforming (hereinafter referred to as beam control).
- FIG. 2 is a diagram showing a sequence for explaining the entire processing of the wireless communication system according to the first embodiment.
- the process shown in FIG. 2 is a process performed by AP1, AP2, and STAs.
- STAs indicate STA1 to STA4.
- the processing of the wireless communication system is divided into five phases: Multi-AP Group Set Phase, Sounding Phase, Coordination Set Phase, Data Tx Phase, and Coordination End Phase.
- Coordination is appropriately abbreviated as Coord. The same applies to the following figure.
- Steps S1 and S2 are Multi-AP Group Set Phases for exchanging information between APs.
- AP1 performs a Multi-AP Group Set with respect to AP2.
- AP2 performs a Multi-AP Group Set with respect to AP1.
- AP1 and AP2 perform Multi-APGroupSet with each other, and whether or not the APs can cooperate with each other, information on the number of transmitting antennas, and Capability information indicating the capability of the cooperation method.
- Maximum STA information that can generate NULL at the same time information such as the identifier of the subordinate STA (AID: AssociationID) are exchanged.
- Steps S3 to S6 are Sounding Phases for exchanging information between AP and STA.
- AP1 transmits NDP (NULL DATA PACKET) Frame, which is a reference signal of a known pattern, NDP-A (Announcement) Frame, which is a signal for notifying NDP, and the like to STAs.
- NDP-A Announcement
- the STAs that have received the NDP Frame and the NDP-A Frame transmit the Feedback Frame, which is a feedback signal, to the AP1.
- AP2 transmits NDP-AFrame, NDPFrame, and the like to STAs.
- STAs transmits a Feedback Frame to AP2.
- AP1 and AP2 transmit NDP-AFrame and NDPFrame, obtain FeedbackFrame from STAs that received NDP-AFrame and NDPFrame, and exchange information between AP-STA.
- the channel information between AP and STA is estimated, and the transmission weight information to be applied by the AP is acquired.
- the Frame (NDP-A, ANP, BFRP (Beamforming Report Protocol) Trigger, Feedback) used in IEEE802.11ax and its sequence are basically assumed.
- the BFRP Trigger Frame is a trigger signal for notifying the beam control.
- AP1 and AP2 acquire Feedback from STAs belonging to other cells and acquire interference power information.
- Steps S7 and S8 are Coordination Set Phases.
- the setup for starting the cooperative operation between AP1 / AP2, that is, the suppression of interference of other cells with the STA is performed.
- AP1 sets a Coordination Request Frame, which is a suppression request signal requesting interference suppression to STA2, to AP2.
- the AP2 that has received the CoordinationRequestFrame determines whether or not to start the interference suppression to the STA2 based on the information in the frame, and in step S8, it is a response signal to the CoordinationRequestFrame based on the determination result. Reply CoordinationResponseFrame to AP1.
- Steps S9 to S11 are Data Tx Phase.
- AP1 and AP2 each transmit data to their subordinate STAs.
- step S9 AP1 performs Data Transmission to STA2.
- step S10 AP2 performs Data Transmission to STA3.
- step S11 STA2 transmits Ack to AP1, and STA3 transmits Ack to AP2.
- TXOP Transmit Opportunity
- TXOP Transmission Opportunity
- Steps S12 and S13 are Coordination End Phases.
- the Coordination End Phase the cooperative operation between AP1 and AP2, that is, the process of terminating the suppression of interference of other cells with the STA is performed.
- step S12 AP1 transmits a Coordination End Frame, which is a signal for ending interference suppression, to AP2.
- AP2 transmits Ack to AP1.
- transmission of Ack is an option.
- the timing at which AP1 transmits Coordination End Frame may be, for example, when STA2 terminates an application that requires RTA packets, or when AP1 completes transmission of all RTA packets.
- the Coordination Set Phase may be included in the Data Tx Phase (that is, it is performed every time TXOP is acquired) or may be included in the Sounding Phase.
- Coordination End Phase may be included in Data Tx Phase.
- Coordination End Phase is performed immediately before the end of TXOP.
- DataTxPhase may be executed multiple times between CoordinationSetupPhase and CoordinationEndPhase.
- FIG. 3 is a diagram showing a configuration example of a Coordination Request Frame.
- CoordinationRequestFrame is composed of MAC header, FrameBody, and FCS (Frame Check Sequence).
- FCS Fre Check Sequence
- MAC header is composed of FrameControl, Duration, Address1 to Address3, SequenceControl, and HTControl fields.
- Frame Body consists of Category, Multi-APAction, DialogToken, and CoordinationRequestElement fields.
- a value indicating that this frame is an Action Frame for Multi-AP is set in the Category field.
- a value indicating that this frame is a Coordination Request Frame is set in the Multi-AP Action field.
- the Coordination Request Element field contains information about the STA that is the target of suppressing interference. Note that this Element may include information about one STA or information about a plurality of STAs. Further, a plurality of CoordinationRequestElements may be included in this Frame.
- the CoordinationRequestElement field is composed of ElementID, Length, CoordinationDuration, CoordinationSTAID, AllowableInterference level, PrecodedPreambleFlag, and RTAPacketInfo fields.
- Identification information indicating that this frame is a Coordination Request Frame is set in the Element ID field.
- the Coordination Duration field information regarding the time for requesting interference suppression from other APs (for example, period information or start / end time (timing), etc.) is set. That is, the time for requesting interference suppression from other APs is also the time for transmitting RTA data. By setting a value such as "0" in this field, it is not necessary to set a specific time. Further, the limit value of this Duration may be defined in the standard.
- the identification information (for example, AID) of the STA to be suppressed from interference is set.
- the identification information the identifier exchanged in the Multi-AP Group Set Phase is used.
- AllowableInterference level field Information on the allowable interference power, which is the allowable interference power in the STA indicated by the Coordination STA ID field, is set in the AllowableInterference level field.
- Information on the allowable interference power is shown as a binary integer in dBm.
- AP2 determines whether or not interference suppression is performed and the method based on the value of this field.
- Precoded Preamble Flag field is requested to start beam control from Preamble at the beginning of the frame if AP2 suppresses interference with STA of other cells by beam control using MIMO (Multi Input Multi Output). Whether or not the flag information is set. If the start of beam control from the Preamble is requested, "1" is set. If the Preamble may be radiated in all directions and the beam control may be performed after the Preamble, "0" is set.
- RTA Packet Info field Information about the RTA packet that AP1 wants to send (for example, Interval, Length, MCS (Modulation Coding Scheme), etc.) is set in the RTA Packet Info field. This field may be omitted depending on the situation.
- the CoordinationRequestFrame is configured as a part of the ActionFrame defined by IEEE802.11, but the frame configuration example is not limited to the example of FIG. For example, it may be configured as a part of ManagementFrame or ControlFrame including a field equivalent to the information specified by CoordinationRequestElement or this Element.
- FIG. 4 is a diagram showing a configuration example of the Coordination Response Frame.
- CoordinationResponseFrame consists of MAC header, FrameBody, and FCS.
- Frame Body consists of Category, Multi-APAction, DialogToken, CoordinationResponseElement, and CoordinationRequestElement fields.
- a value indicating that this frame is an Action Frame for Multi-AP is set in the Category field.
- a value indicating that this frame is a Coordination Response Frame is set in the Multi-AP Action field.
- Coordination Response Element field includes each field of Element ID, Length, Result flag, Reason Code.
- the Result flag field is set to "1" when accepting the request for interference suppression, and "0" when rejecting it.
- this Frame may include a plurality of CoordinationResponseElements.
- Reason flag / Reason Code in Coordination Response Element may be included in the same Element for the requested STA.
- AP2 may transmit by adding the above-mentioned Coordination Request Element to this frame. In this case, AP1 must return a response signal containing CoordinationResponseElement to AP2.
- the CoordinationResponseFrame is configured as a part of the ActionFrame defined by IEEE802.11, but the frame configuration example is not limited to the example of FIG. For example, it may be configured as a part of Management Frame or Control Frame including a field equivalent to the information specified by Coordination Response Element or this Element.
- FIG. 5 is a diagram showing a configuration example of Preamble included in the data frame transmitted by AP1 / AP2.
- the Preamble included in the data frame consists of L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, EHT-SIG-A, EHT-STF, and EHT-LTF fields.
- the field of EHT-SIG-A includes at least each field of Receiver STAID, RTA Info, Nulling Flag, and Coordination Request Info. It should be noted that these information may be included not only in EHT-SIG-A but also in Preamble. Alternatively, the control field in the MAC header may contain equivalent information.
- the STA identification information of the destination is set in the Receiver STA ID field.
- the identification information the identifier exchanged in the Multi-AP Group Set Phase is used.
- RTAInfo is a flag (RTA flag) indicating whether or not an RTA packet is included in the data transmission of AP1, the time when the transmission of the RTA packet is started (RTA Tx Start Time), and the transmission duration of the RTA packet.
- RTA flag a flag indicating whether or not an RTA packet is included in the data transmission of AP1
- RTA Tx Start Time the time when the transmission of the RTA packet is started
- RTA Tx Start Time the time when the transmission of the RTA packet is started
- Each subfield such as (RTATxDuration) and AckPolicy for RTA packets is included.
- Start time and Duration are information related to the transmission time of RTA packets.
- the information regarding the transmission time of the RTA packet is not limited to Start time and Duration.
- the time (RTA Tx End Time) at which the transmission of the RTA packet ends may be set, and the aggregate is not the time information.
- the number of the packet that is an RTA packet may be specified.
- the Ack Policy subfield does not have to be notified.
- Nulling Flag field a flag indicating whether or not the AP that sends this data is generating Null to the STA of another cell is set. If the Nulling Flag is "1", it means that the AP sends data to the STA requested by another AP in the Coordination Set Phase with Null generated.
- CoordinationRequestInfo some information (for example, PrecodedPreambleFlag, AllowableInterferenceLevel, etc.) included in the CoordinationRequestFrame described above in FIG. 3 is set.
- CoordinationRequestInfo Normally, the same value as the value notified by CoordinationRequestFrame is set in CoordinationRequestInfo, so CoordinationRequestInfo does not have to be included in Preamble. However, for example, when pre-negotiation such as CoordinationRequestFrame is not performed, or when the information notified by CoordinationRequestFrame changes frequently, the same information may be notified in Preamble.
- FIG. 6 is a diagram showing a configuration example of the Coordination End Frame.
- CoordinationEndFrame consists of MAC header, FrameBody, and FCS.
- Frame Body consists of Category, Multi-APAction, and DialogToken fields.
- a value indicating that this frame is an Action Frame for Multi-AP is set in the Category field.
- a value indicating that this frame is a Coordination End Frame is set in the Multi-AP Action field.
- CoordinationEndFrame is configured as a part of ActionFrame defined by IEEE802.11, but the frame configuration example is not limited to the example of FIG.
- FIG. 7 is a diagram showing a first example of the data sequence of the Data Tx Phase in the first embodiment.
- FIG. 7 shows an example in which AP1 transmits a data signal including an RTA packet to STA2, AP2 generates Null to STA2, and transmits a data signal to STA3. ing.
- Rx represents the reception of a data frame transmitted from another AP or STA. The same applies to the following figures.
- AP1 acquires TXOP by Back Off, etc., and starts transmitting a data frame containing the data signal of the RTA packet to STA2 at time t1.
- AP2 acquires information about AP1 from the received Preamble at time t2 after receiving Preamble among the data frames transmitted from AP1.
- Information about AP1 is that AP1 is transmitting data to STA2 for which interference suppression is requested from AP1 in Coordination Set Phase, that the data signal contains RTA packet data, and that RTA packet transmission. Start time and transmission period, etc. That is, FIG. 7 shows an example in which Precoded Preamble to AP2 is not required.
- Precoded Preamble represents interference suppression from Preamble as described above.
- AP2 starts data transmission to STA3 based on the acquired information about AP1.
- SIFS Short InterFrame Space
- BO Back Off
- the AP2 adopts, for example, a method of generating Null for the STA2 by controlling the transmission power, and starts the data transmission after the Preamble to the STA3.
- AP1 and AP2 end data transmission.
- STA2 transmits Ack, which is a data response confirmation signal, to AP1, and STA3 transmits Ack to AP2.
- AP2 in order to avoid the collision of Ack, AP2 must set the data transmission period according to the end time (timing) of data transmission of AP1.
- the end time of data transmission of AP1 can be confirmed from the Duration information included in the Preamble or the MAC header. If there is not enough data to be transmitted, AP2 needs to align the end time of data transmission with AP1 by providing padding bits.
- FIG. 8 is a diagram showing a second example of the data sequence of the Data Tx Phase in the first embodiment.
- FIG. 8 shows an example in which AP1 also generates null for STA3, just as AP2 in FIG. 7 generated null for STA2.
- AP1 determines whether or not AP1 generates Null is determined by whether or not CoordinationRequestElement is included in the CoordinationResponseFrame transmitted from AP2 in CoordinationSetPhase. In this case, AP1 sets "1" in the Nulling Flag field in Preamble / EHT-SIG-A and transmits data.
- AP1 acquires TXOP, and at time t11, AP1 starts transmitting a data frame containing the data signal of the RTA packet to STA2. Of the data frames, at time t12 after the completion of Preamble transmission, AP1 adopts a method of generating Null for STA3 and starts transmission of data after Preamble to STA2.
- AP2 receives the information about AP1 from the received Preamble at time t12 after receiving the Preamble transmitted from AP1.
- AP2 starts data transmission to STA3 based on the acquired information about AP1 at time t13 when SIFS + BO time has elapsed from time t12. Of the data frames, at time t14 after the completion of Preamble transmission, AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- FIG. 9 is a diagram showing a third example of the data sequence of the Data Tx Phase in the first embodiment.
- AP1 transmits a data signal not including RTA packet and a data signal including RTA packet
- AP2 adopts a method of generating null for STA2 by beam control from data transmission after preamble. An example is shown.
- AP1 acquires TXOP and starts transmitting a data frame to STA2 at time t21.
- AP1 starts the data transmission after the Preamble to the STA2 at the time t22 after the transmission of the Preamble is completed in the data frame. Note that AP1 starts data transmission that does not include an RTA packet at time t22, and starts data transmission that includes an RTA packet at time t25.
- AP2 acquires information about AP1 from the received Preamble at time t22 after receiving Preamble among the data frames transmitted from AP1.
- AP2 since the AP2 radiates the Preamble in all directions, only the Preamble transmitted by the AP2 may collide with the STA2 as a strong interference signal. Therefore, AP2 confirms at what timing (time t25 timing) the RTA packet is transmitted from the RTA Infofield of Preamble / EHT-SIG-A transmitted from AP1.
- AP2 transmits the Preamble in all directions from time t22 to time t23 when SIFS + BO time has elapsed. At time t24, AP2 controls STA2 to generate Null by beam control from the data transmission after Preamble.
- the beam control is controlled to generate Null for STA2.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- FIG. 10 is a diagram showing a fourth example of the data sequence of the Data Tx Phase in the first embodiment.
- FIG. 10 shows an example in which AP2 takes a method (Precoded Preamble) of generating Null from Preamble to STA2.
- AP2 can suppress interference from Preamble to STA2.
- AP1 acquires TXOP and requests Precoded Preamble from AP2, it is a transmission request signal that requests transmission of MU (Multi User) -RTS (Request To Send) at time t31.
- MU-RTS is a transmission priority request signal that requests transmission priority.
- AP2 receives the request from AP1 and sends it to MU-RTS at least AP1 and STA1 to STA4 at time t32.
- AP1, STA2, and STA3 return CTS (Clear To Send) to AP2.
- NAV Network Allocation Vector, transmission prohibition period
- AP1 starts transmitting a data frame containing the data signal of the RTA packet to STA2.
- AP1 starts the data transmission after the Preamble to the STA2 at the time t35 after the transmission of the Preamble is completed in the data frame.
- AP2 controls to generate Null for STA2 by beam control from the transmission of Preamble.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- AP1 Since AP1 cannot know the STA that AP2 wants to send when acquiring TXOP, it requests AP2 to send MU-RTS, but AP1 preliminarily gives information on the destination of AP2. If it can be obtained in, AP1 may send MU-RTS directly.
- FIG. 11 is a diagram showing a fifth example of the data sequence of the Data Tx Phase in the first embodiment.
- FIG. 11 shows an example in which AP1 does not receive Ack from STA2 by setting AckPolicy in RTAInfofield of Preamble / EHT-SIG-A to "NoAck".
- AP1 acquires TXOP, and at time t41, AP1 starts transmitting a data frame containing a data signal of an RTA packet to STA2.
- AP2 acquires information about AP1 from the received Preamble at time t42 after receiving Preamble among the data frames transmitted from AP1.
- AP2 From time t42, at time t43 when SIFS + BO time has elapsed, AP2 starts data transmission to STA3 based on the acquired information about AP1. Of the data frames, at time t44 after the completion of Preamble transmission, AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 ends data transmission.
- AP2 ends data transmission.
- STA3 sends an Ack to AP2.
- AP1 transmits an RTA packet to STA1, that is, a packet that makes no sense unless it is transmitted within a certain delay time, it cannot afford to retransmit even if data transmission fails. Is possible.
- AP1 does not acquire Ack from STA2, erases the RTA packet from the transmission buffer at the end of data transmission, and operates so as not to retransmit.
- AP2 does not have to consider the collision of Ack, so that the operation of adjusting the end time of data transmission as described above in FIG. 7 becomes unnecessary.
- AP2 can continue to transmit its own data even after the data transmission of AP1 is completed.
- FIG. 12 is a block diagram showing a configuration example of a wireless communication device.
- the wireless communication device 11 shown in FIG. 12 is a device that operates as an AP.
- the wireless communication device 11 is composed of a wireless processing unit 21, wireless communication units 22-1 and 22-2, and an AP-AP communication unit 23.
- the wireless processing unit 21 controls communication with the AP and communication with the STA.
- the wireless processing unit 21 is composed of a wireless I / F (interface) unit 31, a data processing unit 32, a communication control unit 33, and a storage unit 34.
- the wireless I / F unit 31 performs analog conversion on the transmission signal generated by the data processing unit 32, and converts the transmission signal from a digital signal to an analog signal. Further, the wireless I / F unit 31 performs digital conversion on the received signals acquired by the wireless communication units 22-1 and 22-2, and converts the received signal from an analog signal to a digital signal.
- the data processing unit 32 generates a transmission signal based on the transmission data and the control information received from the communication control unit 33, and outputs the generated transmission signal to the wireless I / F unit 31.
- the data processing unit 32 demodulates the received signal converted by the wireless I / F unit 31 and performs a process of extracting the received data and control information.
- the data processing unit 32 outputs the extracted control information to the communication control unit 33, and outputs the extracted received data to an upper layer (not shown).
- the data processing unit 32 receives the control information and data supplied from the AP-AP communication unit 23 and outputs the control information and data to the communication control unit 33.
- the communication control unit 33 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.
- the communication control unit 33 executes a program stored in ROM or the like, and controls the entire operation of the wireless communication device 11.
- the communication control unit 33 generates control information to be notified to another AP or STA, and performs a process of passing it to the data processing unit 32.
- the communication control unit 33 determines whether or not Precoded Preamble is requested from AP2 after acquiring TXOP, and based on the determination result, outputs the above-mentioned MU-RTS request signal. Controls transmission or starts transmission of data including RTA data.
- the communication control unit 33 When operating as AP2, for example, the communication control unit 33 transmits or needs to transmit MU-RTS based on a determination result of whether the received signal is a MU-RTS request signal or a data signal. Null is generated according to the data transmission, and control is performed to wait for or start data transmission.
- the wireless communication units 22-1 and 22-2 are equipped with an antenna and perform wireless communication with the STA based on the communication resources set by the communication control unit 33 and the like.
- the wireless communication units 22-1 and 22-2 are referred to as wireless communication units 22 when there is no particular need to distinguish them.
- the wireless communication unit 22 is not limited to two, and includes a plurality of (n> 1) wireless communication units 22-1 to 22-n.
- the wireless communication unit 22 performs RF processing on the wireless signal supplied from the antenna to generate a received signal, and outputs the received signal to the wireless I / F unit 31.
- the wireless communication unit 22 performs RF processing on the transmission signal supplied from the wireless I / F unit 31 to generate a wireless signal.
- the wireless communication unit 22 outputs the generated wireless signal to the antenna.
- the electromagnetic wave received by the antenna is output to the wireless communication unit 22 as a wireless signal. Further, the antenna emits a wireless signal generated by the wireless communication unit 22 as an electromagnetic wave.
- the AP-AP communication unit 23 performs notification processing or acquisition processing of control information and data necessary for cooperation between APs.
- the AP-AP communication unit 23 includes at least one of a wired cable outlet and an antenna, and the communication between APs may be wired or wireless.
- the wireless communication unit 22 may be configured so that the wireless communication unit 22 takes on the function of the AP-AP communication unit 23. Further, the control information that needs to be transmitted to both the AP and the STA is subjected to communication processing via the wireless communication unit 22.
- FIG. 12 shows an example in which the wireless processing unit 21 is configured as one IC, but the IC configuration of the present technology is not limited to this.
- the wireless I / F unit 31 may be mounted as another IC.
- the configuration of the wireless communication terminal 12 of FIG. 1 is a configuration in which the AP-AP communication unit 23 is excluded from the configuration of the wireless communication device 11 of FIG. 12, the configuration of the wireless communication device 11 of FIG. 12 will be described thereafter. Is also used as the configuration of the wireless communication terminal 12.
- FIG. 13 is a flowchart illustrating the processing in the first embodiment of the wireless communication device 11-1 operating as AP1.
- step S31 the communication control unit 33 of the wireless communication device 11-1 acquires TXOP by Back Off or the like.
- step S32 the communication control unit 33 determines whether or not the AP2 is requested to suppress interference from Precoded Preamble, that is, Preamble. If it is determined in step S32 that the AP2 has requested the Precoded Preamble, the process proceeds to step S33 (FIG. 10).
- step S33 the wireless communication unit 22 transmits a MU-RTS request signal requesting MU-RTS to AP2.
- AP2 sends MU-RTS.
- step S34 the wireless communication unit 22 transmits the CTS to the AP2 after receiving the MU-RTS transmitted from the AP2.
- step S32 If it is determined in step S32 that the Precoded Preamble is not requested from AP2, steps S33 and S34 are skipped, and the process proceeds to step S35 (FIGS. 7 to 9 and 11).
- step S35 the wireless communication unit 22 starts data transmission to STA2.
- FIG. 14 is a flowchart illustrating the processing in the first embodiment of the wireless communication device 11-2 operating as AP2.
- step S51 the wireless communication unit 22 of the wireless communication device 11-2 receives the signal transmitted from the AP1.
- step S52 the communication control unit 33 determines whether or not the signal received by the wireless communication unit 22 is a MU-RTS request signal. If it is determined in step S52 that the signal received by the wireless communication unit 22 is the MU-RTS request signal, the process proceeds to step S53.
- step S53 the wireless communication unit 22 transmits the MU-RTS.
- the AP1 the destination of AP1 (STA2), and the destination of AP2 (STA3) are included as the destinations for transmitting the MU-RTS.
- the information on the transmission destination of AP1 is included in the MU-RTS request signal.
- step S52 if the signal received by the wireless communication unit 22 is a data signal and it is determined in step S52 that the signal received by the wireless communication unit 22 is not a MU-RTS request signal, the process proceeds to step S54.
- step S54 the communication control unit 33 checks the Preamble SIG-A from the received signal.
- step S55 the communication control unit 33 determines whether or not to generate Null in STA2, which is the transmission destination of AP1, based on the checked Preamble SIG-A.
- At least the Receiver STA ID is the same as the STA ID (Coordination STA ID) specified from AP1 in the Coordination Request Frame. Further, it may be determined in combination with other conditions. For example, if it can be calculated that the interference power given to STA2 does not exceed the AllowableInterference level even if AP2 transmits to the destination STA3 with the maximum transmission power, AP2 does not have to generate Null in STA2. Furthermore, if the RTA flag in the RTA Info of the Preamble is "0", AP2 does not have to generate Null in STA2.
- step S55 If it is determined in step S55 that Null is generated in STA2, the process proceeds to step S56.
- step S56 the communication control unit 33 determines whether or not the collision of the Preamble can be avoided while the AP1 is transmitting the RTA packet.
- step S56 it is determined that the collision of the Preamble can be avoided if any of the following (1) to (3) is satisfied.
- step S56 If it is determined in step S56 that the collision of the Preamble can be avoided, the process proceeds to step S57.
- step S57 the communication control unit 33 generates Null in STA2, and the wireless communication unit 22 causes STA3 to start data transmission.
- step S58 the communication control unit 33 sets the NAV and waits for the data transmission until the data transmission of the AP1 is completed.
- step S54 If it is determined in step S54 that Null is not generated in STA2, the process proceeds to step S59.
- step S59 the wireless communication unit 22 starts data transmission to STA3.
- FIG. 15 is a diagram showing a sequence illustrating the entire processing of the wireless communication system according to the second embodiment.
- the processing of the wireless communication system shown in FIG. 15 is divided into five phases of Multi-AP Group Set Phase, Sounding Phase, Coordination Set Phase, Data Tx Phase, and Coordination End Phase.
- Steps S101 and S102 are Multi-AP Group Set Phases similar to steps S1 and S2 in FIG.
- Steps S103 to S106 are Sounding Phases similar to steps S3 to S6 in FIG.
- Steps S107 and S108 are Coordination Set Phases similar to steps S7 and S8 in FIG.
- Steps S109 to S111 are Data Tx Phases, but the order of data transmission is different from steps S9 to S11 in FIG.
- Steps S112 and S113 are Coordination End Phases similar to steps S12 and S13 in FIG.
- steps S101 to S108 in FIG. 15 and S112 and S113 perform the same processing as steps S1 to S8 in FIG. 2 and S12 and S13, the description thereof will be omitted.
- step S109 AP2 performs Data Transmission to STA3.
- step S110 AP1 performs Data Transmission to STA2.
- step S111 STA3 transmits Ack to AP2, and STA2 transmits Ack to AP1.
- FIG. 16 is a diagram showing a first example of the data sequence of the Data Tx Phase in the second embodiment.
- AP2 generates a null for STA2 and transmits a data signal to STA3, and AP1 does not generate a null for STA2 and a data signal including an RTA packet.
- An example of sending is shown.
- AP2 acquires TXOP and starts transmitting a data frame to STA3 at time t101.
- AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 After receiving the Preamble transmitted from AP2, AP1 acquires the same information about AP2 as the information about AP1 in the case of FIG. 7 from the received Preamble at time t102. From time t102, at time t103 when SIFS + BO time has elapsed, AP1 starts data transmission including RTA data to STA2 based on the acquired information about AP2. Of the data signals, AP1 starts the data transmission after the Preamble to the STA3 at the time t104 after the transmission of the Preamble is completed.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- FIG. 17 is a diagram showing a second example of the data sequence of the Data Tx Phase in the second embodiment.
- FIG. 17 shows an example in which AP2 generates Null for STA2 and AP1 generates Null for STA3, as in FIG.
- AP2 acquires TXOP and starts transmitting a data frame to STA3 at time t111.
- AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 After receiving the Preamble transmitted from AP2, AP1 acquires information about AP2 from the received Preamble at time t112. From time t112, at time t113 when SIFS + BO time has elapsed, AP1 starts data transmission including RTA data to STA2 based on the acquired information about AP2. Of the data signals, at time t114 after the completion of Preamble transmission, AP1 adopts a method of generating Null for STA3 and starts data transmission after Preamble to STA2.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- FIG. 18 is a diagram showing a third example of the data sequence of the Data Tx Phase in the second embodiment.
- FIG. 18 shows an example in which AP1 takes a method (Precoded Preamble) of generating Null for STA3 by beam control.
- AP1 can suppress interference from Preamble to STA3.
- AP2 acquires TXOP and requests Precoded Preamble from AP1, it sends MU-RTS to AP1 and STA1 to STA4 at time t131.
- AP1, STA2, and STA3 return CTS to AP2.
- AP2 starts transmitting a data frame to STA3.
- AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 After receiving the Preamble transmitted from AP2, AP1 acquires information about AP2 from the received Preamble at time t134. At time t135 when SIFS + BO time has elapsed from time t134, AP1 takes a method of generating null for STA3 based on the acquired information about AP2, and data including RTA data for STA2. Start sending.
- AP1 and AP2 end data transmission.
- STA2 sends Ack to AP1 and STA3 sends Ack to AP2.
- FIG. 19 is a diagram showing a fourth example of the data sequence of the Data Tx Phase in the second embodiment.
- FIG. 19 as in FIG. 11, an example is shown in which AP1 does not receive Ack from STA2 by setting AckPolicy in RTAInfofield of Preamble / EHT-SIG-A to “NoAck”. Has been done.
- AP2 acquires TXOP, and at time t141, AP2 starts transmitting a data frame to STA3.
- AP2 adopts a method of generating Null for STA2 and starts transmission of data after Preamble to STA3.
- AP1 After receiving the Preamble signal transmitted from AP2, AP1 acquires information about AP2 from the received Preamble at time t142.
- AP1 starts transmitting data including RTA packets to STA2 based on the acquired information about AP2.
- AP1 ends data transmission.
- AP2 ends data transmission.
- STA3 sends an Ack to AP2.
- AP1 transmits an RTA packet to STA1, that is, a packet that makes no sense unless it is transmitted within a certain delay time, it cannot afford to retransmit even if data transmission fails. Is possible.
- AP1 does not acquire Ack from STA2, erases the RTA packet from the transmission buffer at the end of data transmission, and operates so as not to retransmit. That is, since AP2 does not have to consider the collision of Ack, it is not necessary to adjust the end time of data transmission as in the case of FIG.
- AP2 can continue to transmit its own data even after the data transmission of AP1 is completed.
- FIG. 20 is a flowchart illustrating the processing in the second embodiment of the wireless communication device 11-2 operating as AP2.
- step S131 the communication control unit 33 of the wireless communication device 11-2 acquires TXOP by Back Off or the like.
- step S132 the communication control unit 33 determines whether or not the Precoded Preamble is requested from the AP1. If it is determined in step S32 that the AP1 has requested the Precoded Preamble, the process proceeds to step S133 (FIG. 18).
- step S133 the wireless communication unit 22 transmits the MU-RTS to at least AP1, STA2, STA3.
- AP1 sends CTS.
- the wireless communication unit 22 receives the CTS transmitted from the AP1, the process proceeds to step S134.
- step S132 If it is determined in step S132 that Precoded Preamble is not requested for AP1, the process of step S133 is skipped and the process proceeds to step S134.
- step S134 the wireless communication unit 22 starts data transmission to STA3.
- FIG. 21 is a flowchart illustrating processing in the second embodiment of the wireless communication device 11-1 operating as AP1.
- step S151 the wireless communication unit 22 of the wireless communication device 11-2 receives the signal transmitted from the AP1.
- step S152 the communication control unit 33 determines whether or not the signal received by the wireless communication unit 22 is MU-RTS. If it is determined in step S152 that the signal received by the wireless communication unit 22 is MU-RTS, the process proceeds to step S153.
- step S153 the wireless communication unit 22 transmits CTS to AP2 after SIFS.
- step S152 if the signal received by the wireless communication unit 22 is a data signal and it is determined in step S152 that the signal received by the wireless communication unit 22 is not MU-RTS, the process proceeds to step S154.
- step S154 the communication control unit 33 checks the Preamble SIG-A from the received signal.
- step S155 the communication control unit 33 determines whether or not the Nulling flag in the checked Preamble SIG-A is 1. If it is determined in step S155 that the Nulling flag is 1, the process proceeds to step S156.
- step S156 the communication control unit 33 determines whether or not AP2 has requested the generation of Null and whether or not the collision cannot be avoided. If it is determined in step S156 that the generation of Null is not requested from AP2 or that the collision can be avoided, the process proceeds to step S157.
- step S157 the wireless communication unit 22 causes STA2 to start data transmission.
- Step S155 if it is determined in step S155 that the Nulling flag is 0, or if it is determined in step S156 that the generation of Null is requested from AP2 and the collision cannot be avoided, the process is performed. , Step S158.
- step S158 the wireless communication unit 22 waits for data transmission to STA2.
- the present technology can also be applied to the case where the STA transmits data to the AP.
- FIG. 22 is a diagram showing a sequence for explaining the entire processing of the wireless communication system according to the third embodiment.
- the processing of the wireless communication system shown in FIG. 22 is divided into five phases of Multi-AP Group Set Phase, Sounding Phase, Coordination Set Phase, Data Tx Phase, and Coordination End Phase.
- Steps S201 and S202 of FIG. 22 are Multi-AP Group Set Phases similar to steps S1 and S2 of FIG.
- Steps S203 to S206 are Sounding Phases similar to steps S3 to S6 in FIG. Since steps S201 to S206 of FIG. 22 perform the same processing as steps S1 to S6 of FIG. 2, the description thereof will be omitted.
- steps S207 to S209 are Coordination Set Phases.
- the setup for starting the cooperative operation between AP1 / AP2, that is, the suppression of interference of other cells with the STA or AP is performed.
- step S207 the STA (STA2 in the case of FIG. 22) that wants to start the transmission of the RTA packet transmits the Coordination Request Frame to the AP of another cell (AP2 in the case of FIG. 22).
- step S208 AP2 transmits a CoordinationResponseFrame, and the STA2 receives the CoordinationResponseFrame to determine whether or not other cells can cooperate.
- the STA may request one AP that is most likely to be affected by interference. Further, as shown by the broken line arrow, the frame exchange may be performed via the AP to which the same cell is connected (AP1 in FIG. 22).
- Coordination Info Sharing Frame which is a cooperation information sharing signal for sharing the cooperation information, to the subordinate STAs (STA3 and STA4 in FIG. 22).
- Coordination Info Sharing Frame transmission is performed to request the sharing of necessary information or suppression of transmission in order to generate Null for STA2 when the subordinate STA starts data transmission.
- Steps S210 to S212 are Data Tx Phase.
- STA2 transmits data to AP1 of the cell to which it belongs.
- step S210 STA2 performs Data Transmission to AP1.
- step S211th STA3 performs Data Transmission to AP2.
- STA3 suppresses interference with STA2 (or AP1).
- step S212 AP1 transmits Ack to STA2.
- AP2 transmits Ack to STA2.
- Steps S213 to S215 are Coordination End Phase.
- a process of terminating the cooperative operation between AP1 and AP2, that is, the suppression of interference of other cells with the STA or AP is performed.
- step S213 when the transmission of the RTA packet is completed, the STA2 transmits the Coordination End Frame to the AP2 in the same manner as the Coordination Set Phase, and ends the cooperative operation. That is, as shown by the broken line arrow, the frame exchange may be performed via the AP to which the same cell is connected (AP1 in FIG. 22).
- step S214 AP2 transmits Ack to STA2.
- transmission of Ack is an option.
- step S215 AP2 transmits a Coordination End Frame to the subordinate STA and ends the cooperative operation.
- step S211 of FIG. 22 an example in which STA3 performs Data Transmission to AP2 has been described, but for example, AP2 may perform Data Transmission to STA3. At this time, for example, AP2 suppresses interference with STA2 (or AP1).
- FIG. 23 is a diagram showing a configuration example of the Coordination Info Sharing Frame.
- Coordination Info Sharing Frame consists of MAC Header, Frame Body, and FCS.
- Frame Body consists of Category, Multi-APAction, DialogToken, and CoordinationInfoElement fields.
- a value indicating that this frame is an Action Frame for Multi-AP is set in the Category field.
- a value indicating that this frame is a Coordination Info Sharing Frame is set in the Multi-AP Action field.
- CoordinationInfoElement field includes ElementID, Length, CoordinationRequestElement, UserInfo # 1 to UserInfo # N fields.
- CoordinationRequestElement field contains information about the person who generates NULL.
- Each field of UserInfo # 1 to UserInfo # N includes AllowableTxPower and NullingTxWeightInfo, respectively.
- Allowable TxPower is information indicating the allowable transmission power for each STA under its control.
- Nulling Tx Weight Info is transmission weight information required for beam control.
- channel estimation between STAs between different cells must be performed by Sounding Phase, and the AP must acquire feedback information.
- the present invention is not limited to the example shown in FIG. 23, and transmission suppression of the corresponding STA may be implemented by providing another field or setting a specific value in the AllowableTxPowerfield.
- the STA that has acquired this frame acquires TXOP and starts data transmission, it performs transmission power or transmission wait processing that is less than or equal to the notified allowable transmission power value, and starts data transmission. If the AP notifies you to suppress transmission, the corresponding STA sets NAV and waits for transmission.
- CoordinationInfoSharingFrame is described as a part of ActionFrame defined by IEEE802.11, but the frame configuration example is not limited to the example of FIG. 23.
- it may be composed of Coordination Info Element or Management Frame or Control Frame including a field equivalent to the information specified by this Element.
- the waiting time of subsequent APs is described as SIFS + BO, but this is the random waiting time by BO so that data transmission collision does not occur even when the number of APs is 3 or more. This is because the operation of is assumed.
- the AP that transmits data may not require BO and may wait only for SIFS to start data transmission.
- the AP1 wireless communication device transmits the first data frame including the first data signal to the STA2 (wireless terminal). Then, before the transmission of the first data frame, the transmission of the suppression request signal that requests the AP2 (another wireless communication device) to suppress the interference with the STA2 is controlled.
- AP1 another wireless communication device that transmits a first data frame including a first data signal to STA2 (first wireless terminal) by AP2 (wireless communication device).
- the suppression request signal for requesting interference suppression to the first wireless terminal, which is transmitted before the transmission of the first data frame, is received. Then, based on the suppression request signal, it is determined whether or not to suppress the interference.
- a data frame including a data signal is transmitted to AP1 (first wireless communication device) by STA2 (wireless communication terminal). Then, before the transmission of the data frame, the transmission of the suppression request signal that requests the AP2 (second wireless communication device) to suppress the interference is controlled.
- an interference request signal requesting interference suppression is transmitted from STA2 (first wireless communication terminal) that transmits a first data frame including a first data signal by AP2 (wireless communication device).
- AP1 other to which STA2 transmits the first data frame based on the interference request signal when it is received and transmits a second data frame different from the first data frame to the second wireless communication terminal. It is determined whether or not to suppress interference with the wireless communication device).
- cooperative information sharing a request for suppression of interference with STA2 (another wireless communication terminal) that transmits a first data frame including a first data signal by STA3 (wireless communication terminal).
- the shared signal is received from AP2 (wireless communication device).
- the STA2 transmits the first data frame to AP1 (another wireless communication device) based on the cooperative information sharing signal. Whether or not to suppress interference is determined.
- FIG. 24 is a block diagram showing a configuration example of computer hardware that executes the above-mentioned series of processes programmatically.
- the CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the input / output interface 305 is further connected to the bus 304.
- An input unit 306 including a keyboard, a mouse, and the like, and an output unit 307 including a display, a speaker, and the like are connected to the input / output interface 305.
- the input / output interface 305 is connected to a storage unit 308 made of a hard disk, a non-volatile memory, etc., a communication unit 309 made of a network interface, etc., and a drive 310 for driving the removable media 311.
- the CPU 301 loads the program stored in the storage unit 308 into the RAM 303 via the input / output interface 305 and the bus 304, and executes the above-mentioned series of processes. Is done.
- the program executed by the CPU 301 is recorded on the removable media 311 or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital broadcasting, and installed in the storage unit 308.
- the program executed by the computer may be a program in which processing is performed in chronological order according to the order described in the present specification, in parallel, or at a necessary timing such as when a call is made. It may be a program in which processing is performed.
- the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Therefore, a plurality of devices housed in separate housings and connected via a network, and a device in which a plurality of modules are housed in one housing are both systems. ..
- this technology can take a cloud computing configuration in which one function is shared by multiple devices via a network and processed jointly.
- each step described in the above flowchart can be executed by one device or shared by a plurality of devices.
- the plurality of processes included in the one step can be executed by one device or shared by a plurality of devices.
- the present technology can also have the following configurations.
- a wireless communication unit that transmits a first data frame containing a first data signal to a wireless terminal
- a wireless communication device including a communication control unit that controls transmission of a suppression request signal that requests another wireless communication device to suppress interference with the wireless terminal before transmission of the first data frame.
- the communication control unit includes, in the suppression request signal, information regarding the identification information of the wireless terminal, information regarding the transmission time of the first data signal, or information indicating the allowable interference power of the wireless terminal in the above (1).
- the communication control unit includes information indicating whether or not to suppress the interference from the beginning of a data frame transmitted by the other wireless communication device in the suppression request signal. (1) or (2).
- Wireless communication device includes information indicating whether or not to suppress the interference from the beginning of a data frame transmitted by the other wireless communication device in the suppression request signal.
- the wireless communication unit receives a response signal in response to the suppression request signal, and receives the response signal. Based on the information of the response signal, the communication control unit transmits the second data signal different from the first data signal to the destination by the other wireless communication device at the time of transmitting the first data frame.
- the wireless communication device according to any one of (1) to (3) above, which determines whether or not to suppress the interference.
- the communication control unit includes the identification information of the wireless terminal, the presence / absence of the first data signal, and the transmission time of the first data signal in the first data frame.
- the wireless communication device according to any one of (4).
- the communication control unit controls transmission of a transmission request signal requesting transmission of a priority request signal requesting transmission priority to the other wireless communication device before transmission of the first data frame.
- the wireless communication device according to any one of 1) to (5).
- the communication control unit includes whether or not to start transmission of the first data frame in a second data frame transmitted from the other wireless communication terminal, which is different from the first data frame.
- the wireless communication device according to any one of (1) to (6) above, which is determined based on information.
- the communication control unit controls the transmission of the notification signal notifying the other wireless communication device of the end of the interference suppression when the transmission of the first data frame is completed.
- the wireless communication device according to any one of 7).
- the wireless communication device is data for which at least one of low delay and high reliability is required.
- the wireless communication device The first data frame containing the first data signal is transmitted to the wireless terminal, and the first data frame is transmitted to the wireless terminal.
- a wireless communication method for controlling transmission of a suppression request signal that requires another wireless communication device to suppress interference with the wireless terminal before transmission of the first data frame.
- the wireless communication unit that receives the suppression request signal,
- a wireless communication device including a communication control unit that determines whether or not to perform the interference suppression based on the suppression request signal.
- the wireless communication device wherein the communication control unit controls transmission of a response signal including information on whether or not the interference suppression is possible and the reason for the possibility as a response to the suppression request signal.
- the communication control unit As a response to the suppression request signal, the communication control unit generates a response signal including information requesting the other wireless communication device to suppress the interference with the second wireless terminal to which the communication control unit is the transmission destination (11). ) Or (12).
- the communication control unit is based on the identification information of the first wireless terminal included in the first data frame, the presence / absence of the first data signal, and the transmission time of the first data signal.
- the wireless communication device determines whether or not to suppress the interference.
- the first communication control unit When the communication control unit starts transmitting a second data frame different from the first data frame to the second wireless terminal to which the communication control unit is a transmission destination, the first communication control unit is designated by the suppression request signal.
- the wireless communication device which determines whether or not to suppress the interference with respect to the wireless terminal of 1.
- the wireless communication device any one of (11) to (15) above, wherein the first data signal is data for which at least one of low delay and high reliability is required.
- the wireless communication device Interference suppression with respect to the first wireless terminal transmitted before transmission of the first data frame from another wireless communication device that transmits the first data frame including the first data signal to the first wireless terminal. Receives a suppression request signal that requests A wireless communication method for determining whether or not to perform the interference suppression based on the suppression request signal. (18) A wireless communication unit that transmits a data frame containing a data signal to the first wireless communication device, A wireless communication terminal including a communication control unit that controls transmission of a suppression request signal that requests interference suppression from a second wireless communication device before transmission of the data frame.
- the wireless communication terminal transmits a data frame containing a data signal to the first wireless communication device, A wireless communication method for controlling transmission of a suppression request signal that requires a second wireless communication device to suppress interference before transmission of the data frame.
- a wireless communication unit that receives an interference request signal requesting interference suppression from a first wireless communication terminal that transmits a first data frame including a first data signal. When transmitting a second data frame different from the first data frame to the second wireless communication terminal, the first wireless communication terminal sets the first data frame based on the interference request signal.
- a wireless communication device including a communication control unit that determines whether or not to suppress the interference with other wireless communication devices to be transmitted.
- the wireless communication device The interference request signal requesting interference suppression is received from the first wireless communication terminal that transmits the first data frame including the first data signal, and the interference request signal is received.
- the first wireless communication terminal sets the first data frame based on the interference request signal.
- a communication unit that receives a coordinated information sharing signal from a wireless communication device that shares a request for interference suppression to another wireless communication terminal that transmits a first data frame including a first data signal.
- the other wireless communication terminal When a second data frame different from the first data frame is transmitted to the wireless communication device, the other wireless communication terminal transmits the first data frame based on the cooperative information sharing signal.
- a wireless communication terminal including a communication control unit for determining whether or not to suppress the interference with the wireless communication device. (23) The wireless communication terminal A coordinated information sharing signal that shares a request for interference suppression to another wireless communication terminal that transmits a first data frame including a first data signal is received from the wireless communication device.
- the other wireless communication terminal transmits the first data frame based on the cooperative information sharing signal.
- a wireless communication method for determining whether or not to suppress the interference with the wireless communication device.
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Abstract
Description
1.システム構成
2.第1の実施の形態(AP1が先に送信権を獲得する例)
3.第2の実施の形態(AP2が先に送信権を獲得する例)
4.第3の実施の形態(STAからAPへの送信の例)
5.その他
<無線通信システムの構成例>
図1は、本技術の実施の形態に係る無線通信システムの構成例を示す図である。
まず、第1の実施の形態として、AP1が先に送信権を獲得する例について説明する。
図2は、第1の実施の形態における無線通信システムの全体の処理について説明するシーケンスを示す図である。
図3は、Coordination Request Frameの構成例を示す図である。
図4は、Coordination Response Frameの構成例を示す図である。
図5は、AP1/AP2が送信するデータフレームに含まれるPreambleの構成例を示す図である。
図6は、Coordination End Frameの構成例を示す図である。
図7は、第1の実施の形態におけるData Tx Phaseのデータシーケンスの第1の例を示す図である。
図8は、第1の実施の形態におけるData Tx Phaseのデータシーケンスの第2の例を示す図である。
図9は、第1の実施の形態におけるData Tx Phaseのデータシーケンスの第3の例を示す図である。
図10は、第1の実施の形態におけるData Tx Phaseのデータシーケンスの第4の例を示す図である。
図11は、第1の実施の形態におけるData Tx Phaseのデータシーケンスの第5の例を示す図である。
図12は、無線通信装置の構成例を示すブロック図である。
図13は、AP1として動作する無線通信装置11-1の第1の実施の形態における処理について説明するフローチャートである。
図14は、AP2として動作する無線通信装置11-2の第1の実施の形態における処理について説明するフローチャートである。
(2)現在受信しているデータフレームのPreamble/EHT-SIG-AのRTA fieldから、自身が送信するPreambleがAP1のRTAパケット送信と被らない場合(図9)
(3)送信電力制御のみで干渉抑制を行う場合(図7)
次に、第2の実施の形態として、AP2が先に送信権を獲得する例について説明する。
図15は、第2の実施の形態における無線通信システムの全体の処理について説明するシーケンスを示す図である。
図16は、第2の実施の形態におけるData Tx Phaseのデータシーケンスの第1の例を示す図である。
図17は、第2の実施の形態におけるData Tx Phaseのデータシーケンスの第2の例を示す図である。
図18は、第2の実施の形態におけるData Tx Phaseのデータシーケンスの第3の例を示す図である。
図19は、第2の実施の形態におけるData Tx Phaseのデータシーケンスの第4の例を示す図である。
図20は、AP2として動作する無線通信装置11-2の第2の実施の形態における処理について説明するフローチャートである。
図21は、AP1として動作する無線通信装置11-1の第2の実施の形態における処理について説明するフローチャートである。
次に、第3の実施の形態として、STAがRTAパケットを送信し、他セルのSTAがNULLを生成する場合について説明する。
図22は、第3の実施の形態における無線通信システムの全体の処理について説明するシーケンスを示す図である。
図23は、Coordination Info Sharing Frameの構成例を示す図である。
なお、本実施の形態においては、後続するAPの待機時間をSIFS+BOとして説明したが、これはAPの台数が3台以上いる場合でもデータ送信の衝突が起きないよう、BOによるランダム待機時間の動作を想定しているためである。
以上のように、第1の本技術においては、AP1(無線通信装置)により、第1のデータ信号を含む第1のデータフレームがSTA2(無線端末)に送信される。そして、第1のデータフレームの送信前に、STA2に対する干渉抑制をAP2(他の無線通信装置)に要求する抑制要求信号の送信が制御される。
上述した一連の処理は、ハードウェアにより実行することもできるし、ソフトウェアにより実行することもできる。一連の処理をソフトウェアにより実行する場合には、そのソフトウェアを構成するプログラムが、専用のハードウェアに組み込まれているコンピュータ、または汎用のパーソナルコンピュータなどに、プログラム記録媒体からインストールされる。
本技術は、以下のような構成をとることもできる。
(1)
第1のデータ信号を含む第1のデータフレームを無線端末に送信する無線通信部と、
前記第1のデータフレームの送信前に、前記無線端末に対する干渉抑制を他の無線通信装置に要求する抑制要求信号の送信を制御する通信制御部と
を備える無線通信装置。
(2)
前記通信制御部は、前記抑制要求信号に、前記無線端末の識別情報、前記第1のデータ信号の送信時間に関する情報、または、前記無線端末の許容干渉電力を示す情報を含める
前記(1)に記載の無線通信装置。
(3)
前記通信制御部は、前記抑制要求信号に、前記他の無線通信装置が送信するデータフレームの先頭から前記干渉抑制を行うか否かを示す情報を含める
前記(1)または(2)に記載の無線通信装置。
(4)
前記無線通信部は、前記抑制要求信号に応答する応答信号を受信し、
前記通信制御部は、前記応答信号の情報に基づいて、前記第1のデータフレームの送信時に、前記第1のデータ信号とは異なる第2のデータ信号の前記他の無線通信装置による送信先への前記干渉抑制を行うか否かを判定する
前記(1)乃至(3)のいずれかに記載の無線通信装置。
(5)
前記通信制御部は、前記第1のデータフレームに、前記無線端末の識別情報、前記第1のデータ信号の存在有無、および前記第1のデータ信号の送信時間に関する情報を含める
前記(1)乃至(4)のいずれかに記載の無線通信装置。
(6)
前記通信制御部は、前記第1のデータフレームの送信前に、前記他の無線通信装置に、送信優先権を要求する優先権要求信号の送信を要求する送信要求信号の送信を制御する
前記(1)乃至(5)のいずれかに記載の無線通信装置。
(7)
前記通信制御部は、前記第1のデータフレームの送信を開始するか否かを、前記他の無線通信端末から送信される、前記第1のデータフレームとは異なる第2のデータフレームに含まれる情報に基づいて判定する
前記(1)乃至(6)のいずれかに記載の無線通信装置。
(8)
前記通信制御部は、前記第1のデータフレームの送信を完了した際、前記他の無線通信装置に対して、前記干渉抑制の終了を通知する通知信号の送信を制御する
前記(1)乃至(7)のいずれかに記載の無線通信装置。
(9)
前記第1のデータ信号は、低遅延および高信頼性の少なくともどちらか一方の要求があるデータである
前記(1)乃至(8)のいずれかに記載の無線通信装置。
(10)
無線通信装置が、
第1のデータ信号を含む第1のデータフレームを無線端末に送信し、
前記第1のデータフレームの送信前に、前記無線端末に対する干渉抑制を他の無線通信装置に要求する抑制要求信号の送信を制御する
無線通信方法。
(11)
第1のデータ信号を含む第1のデータフレームを第1の無線端末に送信する他の無線通信装置から前記第1のデータフレームの送信前に送信された、前記第1の無線端末に対する干渉抑制を要求する抑制要求信号を受信する無線通信部と、
前記抑制要求信号に基づいて、前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信装置。
(12)
前記通信制御部は、前記抑制要求信号に対する応答として、前記干渉抑制の可否および前記可否の理由に関する情報を含む応答信号の送信を制御する
前記(11)に記載の無線通信装置。
(13)
前記通信制御部は、前記抑制要求信号に対する応答として、自身による送信先である第2の無線端末に対する前記干渉抑制を前記他の無線通信装置に要求する情報を含む応答信号を生成する
前記(11)または(12)に記載の無線通信装置。
(14)
前記通信制御部は、前記第1のデータフレームに含まれる前記第1の無線端末の識別情報、前記第1のデータ信号の存在有無、および前記第1のデータ信号の送信時間に関する情報に基づいて、後続して、自身による送信先である第2の無線端末に、前記第1のデータフレームとは異なる第2のデータフレームの送信を開始するか否か、および前記第1の無線端末に対して前記干渉抑制を行うか否かを判定する
前記(11)に記載の無線通信装置。
(15)
前記通信制御部は、自身による送信先である第2の無線端末に、前記第1のデータフレームとは異なる第2のデータフレームの送信を開始する際、前記抑制要求信号で指定された前記第1の無線端末に対して前記干渉抑制を行うか否かを判定する
前記(11)に記載の無線通信装置。
(16)
前記第1のデータ信号は、低遅延および高信頼性の少なくともどちらか一方の要求があるデータである
前記(11)乃至(15)のいずれかに記載の無線通信装置。
(17)
無線通信装置が、
第1のデータ信号を含む第1のデータフレームを第1の無線端末に送信する他の無線通信装置から前記第1のデータフレームの送信前に送信された、前記第1の無線端末に対する干渉抑制を要求する抑制要求信号を受信し、
前記抑制要求信号に基づいて、前記干渉抑制を行うか否かを判定する
無線通信方法。
(18)
第1の無線通信装置に、データ信号を含むデータフレームを送信する無線通信部と、
前記データフレームの送信前に、干渉抑制を第2の無線通信装置に要求する抑制要求信号の送信を制御する通信制御部と
を備える無線通信端末。
(19)
無線通信端末が
第1の無線通信装置に、データ信号を含むデータフレームを送信し、
前記データフレームの送信前に、干渉抑制を第2の無線通信装置に要求する抑制要求信号の送信を制御する
無線通信方法。
(20)
第1のデータ信号を含む第1のデータフレームを送信する第1の無線通信端末から干渉抑制を要求する干渉要求信号を受信する無線通信部と、
第2の無線通信端末への、前記第1のデータフレームとは異なる第2のデータフレームの送信時に、前記干渉要求信号に基づいて、前記第1の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信装置。
(21)
無線通信装置が、
第1のデータ信号を含む第1のデータフレームを送信する第1の無線通信端末から干渉抑制を要求する干渉要求信号を受信し、
第2の無線通信端末への、前記第1のデータフレームとは異なる第2のデータフレームの送信時に、前記干渉要求信号に基づいて、前記第1の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する
無線通信方法。
(22)
第1のデータ信号を含む第1のデータフレームを送信する他の無線通信端末への干渉抑制の要求を共有する協調情報共有信号を無線通信装置から受信する通信部と、
前記第1のデータフレームとは異なる第2のデータフレームの前記無線通信装置への送信時に、前記協調情報共有信号に基づいて、前記他の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信端末。
(23)
無線通信端末が、
第1のデータ信号を含む第1のデータフレームを送信する他の無線通信端末への干渉抑制の要求を共有する協調情報共有信号を無線通信装置から受信し、
前記第1のデータフレームとは異なる第2のデータフレームの前記無線通信装置への送信時に、前記協調情報共有信号に基づいて、前記他の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する
無線通信方法。
Claims (18)
- 第1のデータ信号を含む第1のデータフレームを無線端末に送信する無線通信部と、
前記第1のデータフレームの送信前に、前記無線端末に対する干渉抑制を他の無線通信装置に要求する抑制要求信号の送信を制御する通信制御部と
を備える無線通信装置。 - 前記通信制御部は、前記抑制要求信号に、前記無線端末の識別情報、前記第1のデータ信号の送信時間に関する情報、または、前記無線端末の許容干渉電力を示す情報を含める
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記抑制要求信号に、前記他の無線通信装置が送信するデータフレームの先頭から前記干渉抑制を行うか否かを示す情報を含める
請求項1に記載の無線通信装置。 - 前記無線通信部は、前記抑制要求信号に応答する応答信号を受信し、
前記通信制御部は、前記応答信号の情報に基づいて、前記第1のデータフレームの送信時に、前記第1のデータ信号とは異なる第2のデータ信号の前記他の無線通信装置による送信先への前記干渉抑制を行うか否かを判定する
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記第1のデータフレームに、前記無線端末の識別情報、前記第1のデータ信号の存在有無、および前記第1のデータ信号の送信時間に関する情報を含める
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記第1のデータフレームの送信前に、前記他の無線通信装置に、送信優先権を要求する優先権要求信号の送信を要求する送信要求信号の送信を制御する
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記第1のデータフレームの送信を開始するか否かを、前記他の無線通信端末から送信される、前記第1のデータフレームとは異なる第2のデータフレームに含まれる情報に基づいて判定する
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記第1のデータフレームの送信を完了した際、前記他の無線通信装置に対して、前記干渉抑制の終了を通知する通知信号の送信を制御する
請求項1に記載の無線通信装置。 - 前記第1のデータ信号は、低遅延および高信頼性の少なくともどちらか一方の要求があるデータである
請求項1に記載の無線通信装置。 - 第1のデータ信号を含む第1のデータフレームを第1の無線端末に送信する他の無線通信装置から前記第1のデータフレームの送信前に送信された、前記第1の無線端末に対する干渉抑制を要求する抑制要求信号を受信する無線通信部と、
前記抑制要求信号に基づいて、前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信装置。 - 前記通信制御部は、前記抑制要求信号に対する応答として、前記干渉抑制の可否および前記可否の理由に関する情報を含む応答信号の送信を制御する
請求項10に記載の無線通信装置。 - 前記通信制御部は、前記抑制要求信号に対する応答として、自身による送信先である第2の無線端末に対する前記干渉抑制を前記他の無線通信装置に要求する情報を含む応答信号の送信を制御する
請求項10に記載の無線通信装置。 - 前記通信制御部は、前記第1のデータフレームに含まれる前記第1の無線端末の識別情報、前記第1のデータ信号の存在有無、および前記第1のデータ信号の送信時間に関する情報に基づいて、後続して、自身による送信先である第2の無線端末に、前記第1のデータフレームとは異なる第2のデータフレームの送信を開始するか否か、および前記第1の無線端末に対して前記干渉抑制を行うか否かを判定する
請求項10に記載の無線通信装置。 - 前記通信制御部は、自身による送信先である第2の無線端末に、前記第1のデータフレームとは異なる第2のデータフレームの送信を開始する際、前記抑制要求信号で指定された前記第1の無線端末に対して前記干渉抑制を行うか否かを判定する
請求項10に記載の無線通信装置。 - 前記第1のデータ信号は、低遅延および高信頼性の少なくともどちらか一方の要求があるデータである
請求項10に記載の無線通信装置。 - 第1の無線通信装置に、データ信号を含むデータフレームを送信する無線通信部と、
前記データフレームの送信前に、干渉抑制を第2の無線通信装置に要求する抑制要求信号の送信を制御する通信制御部と
を備える無線通信端末。 - 第1のデータ信号を含む第1のデータフレームを送信する第1の無線通信端末から干渉抑制を要求する干渉要求信号を受信する無線通信部と、
第2の無線通信端末への、前記第1のデータフレームとは異なる第2のデータフレームの送信時に、前記干渉要求信号に基づいて、前記第1の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信装置。 - 第1のデータ信号を含む第1のデータフレームを送信する他の無線通信端末への干渉抑制の要求を共有する協調情報共有信号を無線通信装置から受信する通信部と、
前記第1のデータフレームとは異なる第2のデータフレームの前記無線通信装置への送信時に、前記協調情報共有信号に基づいて、前記他の無線通信端末が前記第1のデータフレームを送信する他の無線通信装置への前記干渉抑制を行うか否かを判定する通信制御部と
を備える無線通信端末。
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KR1020237004542A KR20230059778A (ko) | 2020-09-02 | 2021-08-19 | 무선 통신 장치 및 무선 통신 단말기 |
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WO2010125635A1 (ja) | 2009-04-27 | 2010-11-04 | 株式会社日立製作所 | 無線通信システム、統合基地局および端末 |
US20110086651A1 (en) * | 2009-08-26 | 2011-04-14 | Samsung Electronics Co. Ltd. | Techniques for interference mitigation in multi-tier communication system |
JP2013507878A (ja) * | 2009-10-13 | 2013-03-04 | クゥアルコム・インコーポレイテッド | 無線通信システムにおける電力決定パイロットの選択的送信 |
EP3148238A1 (en) * | 2014-05-30 | 2017-03-29 | Huawei Technologies Co., Ltd. | Interference control method and apparatus, and network element device |
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2021
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WO2010125635A1 (ja) | 2009-04-27 | 2010-11-04 | 株式会社日立製作所 | 無線通信システム、統合基地局および端末 |
US20110086651A1 (en) * | 2009-08-26 | 2011-04-14 | Samsung Electronics Co. Ltd. | Techniques for interference mitigation in multi-tier communication system |
JP2013507878A (ja) * | 2009-10-13 | 2013-03-04 | クゥアルコム・インコーポレイテッド | 無線通信システムにおける電力決定パイロットの選択的送信 |
EP3148238A1 (en) * | 2014-05-30 | 2017-03-29 | Huawei Technologies Co., Ltd. | Interference control method and apparatus, and network element device |
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LOPEZ-PEREZ DAVID, GARCIA-RODRIGUEZ ADRIAN, LORENZO GALATI, GIORDANO MIKA, KASSLIN OLLI, ALANEN ENRICO, RANTALA SLIDE, NOKIA: "Coordinated Beamforming/Null Steering Protocol in 802.11be ", IEEE, 16 September 2019 (2019-09-16), XP055908137, [retrieved on 20220401] * |
See also references of EP4203537A4 |
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EP4203537A4 (en) | 2024-02-21 |
BR112023003333A2 (pt) | 2023-04-04 |
KR20230059778A (ko) | 2023-05-03 |
JPWO2022050058A1 (ja) | 2022-03-10 |
CN116210349A (zh) | 2023-06-02 |
EP4203537A1 (en) | 2023-06-28 |
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