WO2022185700A1 - 通信装置及び通信方法 - Google Patents
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- 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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- this disclosure relates to a communication device and a communication method for wireless communication.
- the IEEE task group TG be proposed a method of implementing higher-density data communication by using multiple frequency bands (links) in parallel.
- a multi-link operation (MLO) technology is being studied that uses a plurality of frequency bands (links) to collectively transmit a set of contents.
- EMLMR Enhanced Multi-Link Multi Radio
- EMLSR Enhanced Multi-Link Single Radio
- a wireless LAN system has been proposed that multiplexes and transmits more data by simultaneously transmitting and receiving multiple streams on one frequency channel.
- an access point can allocate arbitrary resources to a plurality of communication terminals and transmit data, and each communication terminal on the receiving side can receive desired data by separating and decoding the respective resources. .
- DLMU downlink multi-user
- UL MU uplink multi-user
- the access point allocates resources to multiple communication terminals under its control, and even if each communication terminal multiplexes and transmits data, the access point It is possible to perform reception on a channel (link) and separate data for each user based on the information described in the header information of each received frame.
- the AP when implementing uplink and downlink multi-user multiplex communication, the AP notifies the Bandwidth Query Report Poll (BQRP) Trigger Frame, and the STA responds to the Bandwidth Query Report It is standardized that a Bandwidth Query Report (BQR) containing available channel information is returned to the Control Subfield, and the AP allocates resources based on the BQR from the STA (for example, Non-Patent Document 1 checking).
- BQRP Bandwidth Query Report Poll
- BQR Bandwidth Query Report
- An object of the present disclosure is to provide a communication device and a communication method that perform wireless communication with a plurality of users using a plurality of frequency bands.
- the present disclosure has been made in consideration of the above problems, and the first aspect thereof is a communication unit capable of wireless communication with a plurality of links; a communication processing unit that performs processing for simultaneously receiving data from a plurality of transmission side communication devices; a control unit that performs control for receiving data from each of the plurality of transmission-side communication devices using an optimum link;
- a communication device comprising:
- the control unit controls to transmit a trigger request signal requesting information on the transmission opportunity to the plurality of transmission-side communication devices on the link on which the reception opportunity has been acquired.
- control unit determines an optimum link for each transmission-side communication device based on request response signals from the plurality of transmission-side communication devices.
- the control unit controls simultaneous data reception from the plurality of transmitting communication devices using the plurality of links based on information regarding links assigned to each transmitting communication device and information regarding multi-user multiplex communication. do.
- a second aspect of the present disclosure is a communication method in a communication device capable of wireless communication with a plurality of links, determining an optimal link for each of the plurality of transmitting communication devices; receiving data simultaneously from a plurality of receiving communication devices using an optimal link for each sending communication device; is a communication method having
- a third aspect of the present disclosure is a communication unit capable of wireless communication with a plurality of links; a communication processing unit that performs processing for receiving data addressed to itself among data simultaneously transmitted from a receiving communication device to a plurality of transmitting communication devices; a control unit that notifies the receiving side communication device of a transmission opportunity of a link that can be used by the receiving side communication device and performs control to transmit data simultaneously with other sending side communication devices on the link specified by the receiving side communication device; ,
- a communication device comprising:
- the control unit in response to receiving the trigger request signal from the receiving communication device, controls to return the request response signal on the link that acquired the transmission opportunity.
- control unit controls to wait for a signal on the link that transmitted the request response signal.
- control unit receives an allocation signal including information about allocation of transmission resources from the receiving communication device, and uses the resources allocated to its own transmission in the allocation signal to transmit to the receiving communication device. data transmission.
- a fourth aspect of the present disclosure is a communication method in a communication device capable of wireless communication with a plurality of links, notifying a receiving communication device of information regarding link transmission opportunities available to it; simultaneously transmitting data destined for the receiving communication device over a link specified by the receiving communication device; is a communication method having
- FIG. 1 is a diagram showing the network status of a wireless LAN system.
- FIG. 2 is a diagram showing an example of frequency bands and channel assignments used in a wireless LAN system.
- FIG. 3 is a diagram showing an example of applying uplink multi-user multiplexing to MLO.
- FIG. 4 is a diagram showing a modification in which uplink multi-user multiplexing is applied to MLO.
- FIG. 5 is a diagram showing another modification in which uplink multi-user multiplexing is applied to MLO.
- FIG. 6 is a diagram illustrating an example of implementing downlink multi-user multiplexing after uplink multi-user multiplexing.
- FIG. 7 is a diagram showing an example of multilink usage detection status in the AP 10. As shown in FIG. FIG. FIG.
- FIG. 8 is a diagram showing an example of the state of multilink usage detection in the STA 11 under the control of the AP 10.
- FIG. 9 is a diagram showing an example of multilink usage detection status in the STA 12 under the control of the AP 10.
- FIG. 10 is a diagram showing an example of multilink usage detection status in the STA 13 under the control of the AP 10.
- FIG. 11 is a diagram showing an example of multilink utilization detection status in the STA 14 under the control of the AP 10.
- FIG. FIG. 12 is a diagram showing an embodiment in which uplink multi-user communication is applied to multi-links in AP10.
- FIG. 13 is a diagram showing an embodiment in which uplink multi-user communication is applied to multi-links in STA 11 under AP 10.
- FIG. 14 is a diagram showing an embodiment in which uplink multi-user communication is applied to multi-links in STA 12 under AP 10.
- FIG. 15 is a diagram showing an embodiment in which uplink multi-user communication is applied to multi-link in STA 13 under AP 10.
- FIG. 16 is a diagram showing an embodiment in which uplink multi-user communication is applied to multi-link in STA 14 under AP 10.
- FIG. 17 is a diagram showing a sequence example of uplink multi-user multiplex communication on link 1.
- FIG. 18 is a diagram showing a sequence example of uplink multi-user multiplex communication on link 4.
- FIG. 19 is a diagram showing a functional configuration of radio communication apparatus 1900.
- FIG. 20 is a diagram showing the internal configuration of the wireless communication module 1905.
- FIG. 21 is a diagram showing the configuration of a management frame required for setting MLO.
- FIG. 22 is a diagram showing the frame format corresponding to each value described in the Type field of the MU MLO information element.
- FIG. 23 is a diagram showing the configuration of the MU MLO Information Element field of the Uplink Trigger Request (TR) frame.
- FIG. 24 is a diagram showing the configuration of the MU MLO Information Element field of the UL Request Response (RR) frame.
- FIG. 25 is a diagram showing the configuration of the MU MLO Information Element field of the UL Allocation (AL) frame.
- FIG. 26 is a diagram showing the configuration of an uplink Block Acknowledgment (BA) frame.
- FIG. 27 is a flowchart illustrating operations performed by an access point during uplink communication.
- FIG. 28 is a flowchart illustrating operations performed by an access point during uplink communication.
- FIG. 29 is a flowchart showing operations performed by a communication terminal during uplink communication.
- FIG. 30 is a flowchart showing operations performed by a communication terminal during uplink communication.
- the BQRP Trigger Frame standardized in IEEE802.11ax has the problem that it is only set to request the STA to return the BQR, and detailed parameters cannot be notified.
- the BQR Control Subfield standardized in IEEE802.11ax can only return short information, and there is a problem that only about eight available channel information can be transmitted continuously.
- channel availability is determined based on CCA (Clear Channel Assessment) detection results. For this reason, even if the NAV (Network Allocation Vector) is set in advance at the time the signal from the OBSS STA is received, if the signal is not actually detected, it will be determined that the channel is available. , there is a problem that when the channel is assigned by the access point, NAV is actually set and transmission cannot be performed.
- CCA Camera Channel Assessment
- each of a plurality of transmission-side communication devices can share a common transmission opportunity (TXOP) according to the status of a transmission opportunity (TXOP) on a link that can be used by each of a plurality of transmission-side communication devices serving as multi-users. It must be determined to which link the data destined for the receiving communication device should be assigned and transmitted.
- the access point is the link on which the RXOP has been obtained among the multi-links, and multiple communication terminals that are uplink transmitters are currently A method for exchanging information indicating which links can be transmitted is described.
- MLO multi-link operation
- the AP sends an MU-MLO Trigger Request to each STA on the transmitting side on a link that can receive the request.
- Each STA returns an MU-MLO Request Response including TXOP information in multilink to the AP.
- the AP sets uplink resources to be used for transmission for each STA from the TXOP information received from each STA on the transmission side.
- the AP notifies the STA that implements MU-MLO of the uplink link used in the MU MLO Allocation.
- (6) Upon receiving the MU-MLO Allocation from the AP, the STA performs uplink transmission on the multilinks assigned to itself.
- the STA can continue to send RXOP information indicating whether or not it can be used, including it in the transmission data (optional).
- the AP performs reception according to the MU MLO Allocation, and returns Block Ack for each STA according to the reception status.
- the AP may specify retransmission of undelivered data in the next Allocation when retransmission is required.
- the uplink MLO may be repeatedly performed during the time when the AP obtains the RXOP and performs the above operations (1) to (9). Additionally, if reverse or downlink data transmission is required, the AP may continue to allocate parameters for downlink multi-user communication or may allocate new parameters.
- FIG. 1 illustrates the network status of a wireless LAN system to which the present disclosure is applied.
- a plurality of communication terminals STA11 to STA14
- BSS1 Basic Service Set 1
- AP10 access point
- OBSS overlapping BBSs
- OBSS2 operated by AP20
- OBSS3 operated by AP30
- STA21 and STA22 are connected to OBSS2
- STA31 and STA32 are connected to OBSS3.
- the radio coverage ranges of the access points AP10, AP20, and AP30 are indicated by dotted ellipses, which indicate the coverage of each network.
- STA12 can grasp the signal from AP20 of BSS2, and STA13 can grasp the signal from AP30 of BSS3. Therefore, in BSS1, when the same link is used by signals from adjacent OBSSs, the network configuration is such that they receive or cause interference with each other.
- BBS1 for example, performs multilink operation.
- the multilink operation will be performed even in an environment where EMLMR devices and EMLSR devices coexist within the BBS1.
- FIG. 2 shows an example of frequency bands and channel assignments used in the wireless LAN system to which the present disclosure is applied.
- the figure shows an example of channel allocation in each frequency band of 2.4 GHz band, 5 GHz band, and 6 GHz band that can be used for wireless LAN.
- the horizontal axis is the frequency axis.
- the operation in the 5 GHz band is subject to conditions for judging the usable frequency range, transmission power, and transmittability according to the legal system of each country.
- channel numbers are given along the horizontal axis. In Japan, eight channels from channel 36 to channel 64 can be used, and eleven channels from channel 100 to channel 140 can be used. In other countries and regions, channel 32, channel 68, channel 96 and channel 144 can be used, and channels 149 to 173 can be used in the upper frequency band.
- 6 GHz band A UNII-5 band has 25 channels
- 6 GHz band B UNII-6 band has 5 channels
- 6 GHz band C UNII-7 band has 17 channels
- 6 GHz band D UNII-8 It is possible to arrange 12 channels in the band.
- one link shall consist of one or a combination of two or more channels in the channel configuration shown in FIG.
- one link is composed of two or more channels that are continuous on the frequency axis, and one link is composed of two or more channels that are not continuous on the frequency axis.
- FIG. 3 shows an example of uplink multi-user multiplexing (UL MU) applied to MLO.
- FIG. 3 shows the state of data transmission and reception seen from the AP's point of view when uplink multi-user multiplex communication is performed on each of links 1 to 4 in order from the top.
- the state of data transmission/reception of links 1 to 4 is shown with the horizontal axis as the time axis.
- an upwardly convex state indicates a state in which the AP is performing a transmission operation on the corresponding link
- a downwardly convex state indicates that the AP is performing a receiving operation on the corresponding link. Indicates the state of implementation.
- the AP sends a Trigger Request (TR) on all available links to each STA that has data to which the AP is the destination.
- TR Trigger Request
- AP transmits TR using links 1 to 4 when all links are available and RXOP is acquired.
- each STA receives TRs from APs on all available links.
- the STA returns a Request Response (RR) if the link that received the TR is available.
- the AP receives RRs from STAs on each link.
- the STA does not return an RR on a link where a signal from an adjacent OBSS is detected or on a link where the OBSS NAV is set so as not to interfere with OBSS communication. That is, the STA sends an RR containing information indicating that a TXOP on that link has been obtained.
- the STA may return RRs on all available links.
- the STA may return RRs only on the link on which it performs the receive operation.
- resources for returning RRs are allocated to STAs that are requested to return. For example, an uplink multi-user multiplexing scheme may be used to allow multiple STAs to return RRs.
- the AP can grasp available links capable of multi-user multiplex communication for each STA. Then, the AP transmits Allocation (AL) to each STA, and notifies in advance the link to be used for uplink multiplex communication. If the STA can receive the AL from the AP, it can transmit multi-user multiplexed data to the AP on the designated link based on that information.
- AL Allocation
- the AP can receive data from each STA by uplink multi-user multiplexing.
- the AP receives Uplink User Data 1 and Uplink User Data 2 on link 1, receives Uplink User Data 3 and Uplink User Data 4 on link 2, and receives Uplink User Data 5 and Uplink User Data 5 on link 3.
- Downlink User Data 6 is received, and Uplink User Data 7 and Uplink User Data 8 are received on link 4.
- the AP when the AP receives data by uplink multi-user multiplex communication, it returns BA to each STA as necessary. At that time, the AP may use the mechanism of downlink multi-user multiplex communication, for example, and use the Multi-STA Block ACK technique to return BA in each link.
- the AP may return the BA including RXOP information indicating that it is possible to continue receiving on that link. Alternatively, the AP may transmit this BA and the next AL at the same time, and may transmit the AL including the resource if retransmission is required.
- the AP may resend the AL to each STA or may not send the AL. Then, the AP causes the corresponding STA to perform uplink multi-user communication as necessary on each link, for example, when there is undelivered data. In addition, the AP returns BAs to each STA after uplink multi-user communication is conducted.
- the AP receives Uplink User Data 9 and Uplink User Data 10 on link 1, receives Uplink User Data 11 and Uplink User Data 12 on link 2, and receives Uplink User Data 13 and 12 on link 3.
- Downlink User Data 14 is received, Uplink User Data 15 and Uplink User Data 16 are received on link 4, and BA is returned on links 1 to 4.
- FIG. 3 shows an example in which such a series of operations are performed simultaneously on each link, they may be performed asynchronously on each link.
- FIG. 4 shows a modification in which uplink multi-user multiplexing (UL MU) is applied to MLO.
- UL MU uplink multi-user multiplexing
- RS Result to Send
- the horizontal axis is the time axis
- the upward convex state on the same time axis represents the state in which the EMLSR and EMLMR STAs are performing transmission operations on the corresponding link
- the downward convex state The state of "Yes" indicates that the EMLSR and EMLMR STAs are performing reception operations on the corresponding link.
- the EMLSR STA When the EMLSR STA receives the TR signal from the AP, instead of RR, it returns Request to Send: RTS (RS) to clearly indicate that it will perform transmission operations on that link. In this case, the EMLSR STA can notify the overlapping network (OBSS) device to set the NAV by explicitly returning the RS.
- RTS Request to Send: RTS
- OBSS overlapping network
- the EMLSR STA has sent Uplink Multi-User Data A to the AP on link N specified by AL from the AP. Furthermore, after that, for example, when retransmission is necessary, EMLSR STA can continue to use the link by receiving AL describing resources for retransmission when BA is returned from AP.
- the EMLMR STA when it receives the TR signal from the AP, instead of the RR, it sends back the RS to clearly indicate that it will operate on that link. In this case, if it is an EMLMR STA, TXOP can be set on other links, so resources are not necessarily allocated on the link that returned the RS. If no AL was received from the AP with multi-user multiplexing on that link, or if the AL did not contain its own communication, the EMLMR STA will unset the NAV by the RS. A Contention Free End (CF-End: CE) indicating this may be transmitted.
- CF-End Contention Free End
- FIG. 5 shows another modification in which uplink multi-user multiplexing (UL MU) is applied to MLO.
- FIG. 5 shows the state of data transmission and reception seen from the AP's point of view after the AP has transmitted the TR signal on link N.
- the horizontal axis is the time axis, and on the same time axis, an upward convex state indicates a state in which the AP is performing a transmission operation on the link N, and a downward convex state is the link.
- N indicates a state in which the AP is performing a reception operation.
- the AP When the AP receives the RR returned from the STA after sending the TR. It is the same as above in that an AL specifying a link for uplink multi-user multiplex communication is transmitted. By further transmitting Clear to Send: CTS (CS) after transmitting AL, the AP can indicate that the receiving operation will be performed thereafter and can notify the OBSS device that the NAV will be set. . This allows the AP to ensure reception of uplink multi-user communications.
- CTS Clear to Send
- FIG. 6 shows an example of implementing downlink multi-user multiplexing (DL MU) after uplink multi-user multiplexing (UL MU).
- FIG. 6 shows the state of data transmission and reception seen from the AP's point of view after the AP has transmitted the TR signal on the link N.
- the horizontal axis is the time axis, and an upward convex state on the same time axis indicates a state in which the AP is performing a transmission operation on the corresponding link, and a downward convex state. represents a state in which the AP is performing a reception operation on the corresponding link.
- the AP returns an RR from the destination STA on the link that sent the TR. Then, the AP can receive data from each STA by uplink multi-user multiplex communication after transmitting AL according to the reception status of RRs returned from each STA (same as above).
- Uplink User Data A and Uplink User Data B are implemented as uplink multi-user multiplex communication from STA (not shown), and AP receives these data and returns BA. do.
- downlink multi-user multiplexing (DL MU) from AP to STA is performed. That is, the AP transmits AL on link N, and then transmits Downlink User Data C and Downlink User Data D. After the downlink multi-user multiplex communication, the AP may cause the STA on the receiving side to return the BA, and the AP receives this BA.
- DL MU downlink multi-user multiplexing
- FIG. 7 shows an example of multilink usage detection status in the AP 10 of the wireless LAN system shown in FIG.
- the AP 10 is trying to implement MLO using the links 1 to 4
- only the link 2 is in a Busy state because it cannot detect and use signals from other networks.
- FIG. 8 shows an example of the multilink usage detection status in the STA 11 under the control of the AP 10.
- FIG. 8 when STA 11 is attempting to perform MLO using links 1 to 4, it does not detect signals from other networks and all links are available. ing.
- FIG. 9 shows an example of multilink usage detection status in the STA 12 under the control of the AP 10 .
- the STA 12 when the STA 12 is trying to perform MLO using links 1 to 4, the signal from the other network is intermittently detected on the link 1 and cannot be used, and the Busy state It has become.
- FIG. 10 shows an example of multilink usage detection status in the STA 13 under the control of the AP 10 .
- the STA 13 when the STA 13 is trying to perform MLO using links 1 to 4, it cannot detect and use signals from other networks on links 3 and 4, and is in a Busy state. It has become. Specifically, the STA 13 first detects a signal from another network on the link 3 and enters the Busy state, and then detects a signal from another network on the link 3 and enters the Busy state.
- FIG. 11 shows an example of multilink usage detection status in the STA 14 under the control of the AP 10 .
- the STA 14 operates as an EMLSR device, and is in a state of setting a data TXOP using only link 1 out of links 1 to 4.
- FIG. 11 shows an example of multilink usage detection status in the STA 14 under the control of the AP 10 .
- the STA 14 operates as an EMLSR device, and is in a state of setting a data TXOP using only link 1 out of links 1 to 4.
- FIG. 11 shows an example of multilink usage detection status in the STA 14 under the control of the AP 10 .
- the STA 14 operates as an EMLSR device, and is in a state of setting a data TXOP using only link 1 out of links 1 to 4.
- the AP and each STA under the AP may have different usable links, in other words, it may be difficult to perform a multi-link operation using all the links. Also, it is assumed that the STAs under the AP include an EMLSR device.
- E. 12 shows an embodiment in which uplink multi-user communication is applied to multi-link in the AP 10 of the wireless LAN system shown in FIG.
- the AP 10 shows an operation assuming a case where the uplink multi-user communication as shown in FIG. 3 is applied under the multilink usage detection situation shown in FIG.
- the state of data transmission/reception of links 1 to 4 is shown with the horizontal axis as the time axis.
- an upward convex state indicates a state in which the AP 10 is performing a transmission operation on the corresponding link
- a downward convex state indicates that the AP 10 is performing a receiving operation on the corresponding link. Indicates the state of implementation.
- AP 10 Since the AP 10 detects a signal from the OBSS on link 2 and is in a Busy state, UL MU communication cannot be performed. Therefore, AP 10 sends TR to STA 11 to STA 14 where data to be delivered to AP 10 exists on link 1, link 3, and link 4, and starts a series of UL MU communication operations.
- STA11 to STA14 on the data transmission side receive TR from AP10 on links 1, 3 and 4.
- STA11 to STA14 return RRs containing the current TXOP information to AP10 on Link1, Link3 and Link4.
- AP10 can grasp links that can be used by each of STA11 to STA14 and are capable of multi-user multiplex communication. Then, AP 10 sends AL to STA11 to STA14 on link 1, link 3, and link 4 to inform them in advance of the links to be used for UL MU communication.
- each of STA11 to STA14 carries out UL MU communication addressed to AP10 on each of link 1, link 3 and link 4, and AP10 receives these.
- AP 10 receives Uplink User Data 1 and Uplink User Data 2 on link 1, receives Uplink User Data 5 and Uplink User Data 6 on link 3, and receives Uplink User Data 7 and Uplink User Data on link 4.
- Receive Data 8
- AP 10 can collect User Data from STA 11 to STA 14 to check whether there is undelivered data that needs to be resent, and returns BA to STA 11 to STA 14 as necessary. Also, if there is data that needs to be retransmitted, the AP 10 can retransmit the AL, specify the resources necessary for transmitting the retransmitted data, and request retransmission.
- AP 10 can resend AL to STA 11 to STA 14 when there is time remaining in RXOP on each of link 1, link 3 and link 4.
- the AL is transmitted again to STA11 to STA14 on link 1, link 3 and link 4, and STA11 to STA14 each based on the AL received from AP10, link 1, link 3 and link 4, perform UL MU communications addressed to AP 10, and AP 10 receives them.
- AP 10 receives Uplink User Data 9 and Uplink User Data 10 on link 1, receives Uplink User Data 13 and Uplink User Data 14 on link 3, and receives Uplink User Data 15 and Uplink User Data on link 4.
- Receive Data 16 In the example shown in FIG. 12, data transmission is performed using all available links, but data transmission may be performed using only some links depending on the amount of data. .
- AP 10 collects User Data from STA 11 to STA 14, checks whether there is undelivered data that needs to be resent, and returns BA to STA 11 to STA 14 as necessary. Then, when there is no remaining time for RXOP on each of link 1, link 3, and link 4, AP 10 once terminates a series of operations related to UL MU communication applied to multilinks.
- FIG. 13 shows an embodiment in which STA 11 under AP 10 applies uplink multi-user communication to multi-link.
- the STA 11 shows an operation assuming a case where uplink multi-user communication as shown in FIG. 3 is applied under the multilink usage detection situation shown in FIG.
- the state of data transmission/reception of links 1 to 4 is shown with the horizontal axis as the time axis.
- an upward convex state indicates a state in which the STA 11 is performing a transmission operation on the corresponding link
- a downward convex state indicates that the SAT 11 is performing a receiving operation on the corresponding link. Indicates the state of implementation.
- STA 11 Since STA 11 has not detected a signal from OBSS on all links 1 to 4, it receives TR from AP 10 on links 1, 3 and 4 and starts a series of UL MU communication operations. do.
- the STA 11 then returns the RR containing the TXOP information at that time to the AP 10 via links 1, 3 and 4. Since there is a possibility that UL MU communication will be performed later on links 1, 3, and 4 that returned RR, STA 11 waits for AL from AP 10 on all of these links.
- STA 11 receives AL from AP 10 on link 1, link 3 and link 4.
- STA 11 is assigned UL MU communication resources on the AL of link 3, so STA 11 sends UL MU communication data (Uplink User Data 6) addressed to AP 10 on link 3. Send.
- the STA11 then receives the BA describing the data reception status from the AP10.
- the STA 11 receives the AL again from the AP 10 on any of the links 1, 3, and 4, it checks the content of the AL, and if the STA 11 includes its own resource allocation, UL MU communication data is transmitted using the link.
- STA11 is allocated UL MU communication resources in the AL of link 3 and link 4, so STA11 receives UL MU communication data ( Send UPlink User Data 14, Uplink User Data 16).
- the STA 11 then receives the BA describing the data reception status on the links 3 and 4 from the AP 10 .
- FIG. 14 shows an embodiment in which STA 12 under AP 10 applies uplink multi-user communication to multi-link.
- the STA 12 shows an operation assuming a case where the uplink multi-user communication as shown in FIG. 3 is applied under the multilink usage detection situation shown in FIG.
- the state of data transmission/reception of links 1 to 4 is shown with the horizontal axis as the time axis.
- an upward convex state indicates a state in which the STA 12 is performing a transmission operation on the corresponding link
- a downward convex state indicates that the STA 12 is performing a receiving operation on the corresponding link. Indicates the state of implementation.
- STA 12 Since STA 12 has detected a signal from OBSS on link 1, it receives TR from AP 10 on links 3 and 4 and starts a series of UL MU communication operations. The STA 12 then returns an RR containing the current TXOP information to the AP 10 via links 3 and 4. Since there is a possibility that UL MU communication will be performed later on link 3 and link 4 that returned RR, STA 12 waits for AL from AP 10 on these links.
- the STA 12 receives the AL from the AP 10 on links 3 and 4.
- STA 12 is assigned resources for UL MU communication on the AL of link 3 and link 4, so STA 12 receives UL MU communication data addressed to AP 10 on link 3 (Uplink User Data 5) is sent, and DL MU communication data (Uplink User Data 8) addressed to AP 10 is sent on link 4.
- the STA 12 receives the BA describing the data reception status from the AP 10.
- the AP 10 returns the BA on the links 3 and 4 on which it received the data, but if necessary, it may return the BA on another link so that the STA 12 receives it.
- the STA 12 may be configured to wait for the AL on each of the links 3 and 4.
- the STA 12 receives the AL from the AP 10 again on either link 3 or link 4, it checks the contents of the AL and if it has been assigned UL MU communication resources, Data transmission to the AP 10 is performed.
- STA 12 is allocated resources for UL MU communication on the ALs of link 3 and link 4, so STA 12 can perform DL MU communication destined for AP 10 on each of link 3 and link 4.
- Send data Uplink User Data 13, Uplink User Data 15).
- the STA 12 then receives the BA describing the data reception status on the links 3 and 4 from the AP 10 .
- FIG. 15 shows an embodiment in which the STA 13 under the AP 10 applies uplink multi-user communication to multilink.
- the STA 13 shows an operation assuming a case where the uplink multi-user communication as shown in FIG. 3 is applied under the multilink usage detection situation shown in FIG.
- the state of data transmission/reception of links 1 to 4 is shown with the horizontal axis as the time axis.
- an upward convex state indicates a state in which the STA 13 is performing a transmission operation on the corresponding link
- a downward convex state indicates that the STA 13 is performing a receiving operation on the corresponding link. Indicates the state of implementation.
- STA 13 Since STA 13 has detected a signal from OBSS on link 3, it receives TR from AP 10 on links 1 and 4 and starts a series of UL MU communication operations. The STA 13 then returns an RR containing the current TXOP information to the AP 10 via links 1 and 4. STA 13 waits for AL from AP 10 on these links because UL MU communication may be performed on links 1 and 4 that returned RR.
- STA 13 receives AL from AP 10 on link 1 and link 4.
- resources for UL MU communication are allocated to STA 13 on the ALs of links 1 and 4.
- the STA 13 transmits UL MU communication data (Uplink User Data 2) addressed to AP 10 on link 1, and transmits UL MU communication data (Uplink User Data 7) addressed to AP 10 on link 4.
- STA 13 detects a signal from OBSS while sending Uplink User Data 7 on link 4, and part of the data does not arrive. Also, the STA 13 is in a state where it cannot receive the BA from the AP 10 on the link 4 .
- the AP 10 writes the BA describing the data reception status on the links 1 and 4 in the BA returned on the link 1 and returns it to the STA 13 . Therefore, the STA 13 can grasp the reception status of AP 10 on links 1 and 4 based on the BA received on link 1 .
- the STA 13 waits for the AL on all links.
- STA 13 detects signals from OBSS on links 3 and 4, so it can only receive AL from AP 10 on link 1. Then, when STA 13 confirms that resources are allocated to itself in the AL received again from AP 10 on link 1, STA 13 retransmits, for example, Send the unreached data of the specified Uplink User Data 7.
- STA 13 receives BA describing the data reception status on link 1 from AP 10 .
- FIG. 16 shows an embodiment in which multilink multiuser communication is applied to multilinks of an EMLSR device.
- the STA 14 under the control of the AP 10 is operating as an EMLSR device, and is in a state of setting the data TXOP using only the link 1 out of the links 1 to 4.
- the horizontal axis is the time axis and shows the state of data transmission/reception of the STA 14 on the link 1.
- the upwardly convex state represents the state in which the STA 14 is performing the transmission operation on the link 1.
- a downwardly convex state represents a state in which the STA 14 is performing a reception operation on the link 1 .
- the STA 14 When the STA 14 receives the TR from the AP 10 on the link 1, it returns the RR containing the TXOP information at that time to the AP 10 on the link 1. STA 14 waits for AL from AP 10 on link 1, since there is a possibility that UL MU communication will be performed after that on link 1 that returned the RR.
- the STA 14 then receives the AL from the AP 10 on the link 1.
- resources for UL MU communication are assigned to STA 14 on the AL of link 1.
- the STA 14 transmits UL MU communication data (Uplink User Data 1) addressed to the AP 10 on the link 1 .
- the STA 14 then receives the BA describing the data reception status from the AP 10 .
- UL MU communication may be performed thereafter. Therefore, STA 14 waits for AL on link 1 .
- the STA 14 transmits UL MU communication data (Uplink User Data 9) addressed to the AP 10 on the link 1.
- UL MU communication data Uplink User Data 9
- the STA 14 then receives the BA describing the data reception status on the link 1 from the AP 10 .
- FIG. 17 shows a sequence of uplink multi-user multiplex communication on link 1.
- control information and user data are exchanged between AP 10 and STA 11 to STA 14 under its control.
- AP 10 sends a TR that triggers the start of MLO applying UL MU communication to STA 11 to STA 14 under its control.
- STA11, STA13, and STA14 which have received TR from AP10, return RR containing TXOP information to AP10.
- AP 10 allocates resources for UL MU communication based on the TXOP information of each of STA 11, STA 13, and STA 14, and transmits AL to STA 11 and STA 13 multiplexed on link 1.
- STA11 and STA13 each transmit multiplexed data (UL User Data) toward AP10 on link 1.
- AP 10 When AP 10 receives this multiplexed data (UL Data Stream), it returns BA describing the reception status to STA 11 and STA 13 via link 1.
- UL Data Stream UL Data Stream
- FIG. 18 shows the sequence of uplink multi-user multiplex communication on link 4.
- control information and user data are exchanged between AP 10 and STA 11 to STA 14 under its control.
- AP 10 sends a TR that triggers the start of MLO applying UL MU communication to STA 11 to STA 14 under its control.
- STA11 to STA13 which have received the TR from AP10, return to AP10 an RR containing TXOP information.
- AP 10 allocates resources for UL MU communication based on the TXOP information of each of STA 11 to STA 13 and transmits AL to STA 12 and STA 13 multiplexed on link 4.
- AP 10 transmits multiplexed data (UL User Data) to AP 10 from STA 12 and STA 13, respectively.
- AP 10 When AP 10 receives the multiplexed data (UL User Data) from STA 12 and STA 13, it returns BA describing the reception status of these to STA 12 and STA 13 via link 4.
- UL User Data UL User Data
- FIG. 19 schematically shows a functional configuration of a wireless communication device 1900 to which the present disclosure is applied.
- the illustrated wireless communication device 1900 can operate as an access point (AP) in the wireless LAN system shown in FIG. 1, for example.
- wireless communication apparatus 1900 may also operate as a communication terminal (STA) under an arbitrary access point.
- AP access point
- STA communication terminal
- the illustrated communication device 1900 includes functional modules of a network connection module 1901 , an information input module 1902 , a device control module 1903 , an information output module 1904 and a wireless communication module 1905 .
- the communication device 1900 may further include other functional modules (not shown), but they are not shown because they are not essential for implementing the present disclosure.
- the network connection module 1901 is configured to implement functions such as a communication modem for connecting to a wide area communication network such as the Internet.
- the network connection module 1901 implements Internet connection via public lines and Internet service providers.
- the information input module 1902 is a module for inputting information that conveys instructions from the user, and is composed of, for example, push buttons, a keyboard, a touch panel, a mouse, and other input devices.
- the device control module 1903 corresponds to a part that controls the operation of the communication device intended by the user as an access point.
- the information output module 1904 is a part that specifically displays the operating state of the wireless communication device 1900 and information obtained via the network. It is composed of a display element such as a Luminescence display and a speaker for outputting sound and music, and can display and notify the user of necessary information.
- a wireless communication module 1905 is a functional module for processing wireless communication.
- the present disclosure is basically realized by the functions provided by the wireless communication module 1905.
- FIG. 1905 is a functional module for processing wireless communication. The present disclosure is basically realized by the functions provided by the wireless communication module 1905.
- FIG. 20 shows in detail the internal configuration of a wireless communication module 1905, which is one of the functional modules included in the wireless communication device 1900 shown in FIG.
- the illustrated wireless communication module 1905 includes an interface 2001, a transmission buffer 2002, a transmission sequence management section 2003, a transmission frame construction section 2004, a network management section 2005, a multilink management section 2006, and a multi-user multiplexing processing section. 2007, a multilink access control unit 2008, a transmission unit 2009, an antenna control unit 2010, an antenna unit 2011, a detection unit 2012, a reception unit 2013, a reception frame analysis unit 2014, and a reception sequence management unit 2015. , and a receive buffer 2016 .
- the interface 2001 is connected to other modules (device control module 1903, etc.) within the wireless communication device 1900, and exchanges various types of information and data.
- a transmission buffer 2002 temporarily stores data to be transmitted wirelessly, for example, received from another module.
- the transmission sequence management unit 2003 grasps the data to be transmitted for each destination and manages the transmission sequence.
- a transmission frame constructing unit 2004 constructs a transmission frame for each destination.
- the network management unit 2005 manages information on access points and information on communication terminals belonging to its own network (BSS).
- the multilink management unit 2006 manages MLO operations.
- the multi-user multiplexing processing unit 2007 performs processing for multi-user multiplex communication.
- the multilink access control unit 2008 controls transmission and reception on each link of the multilink based on a predetermined access control procedure.
- the transmission unit 2009 performs transmission processing of data to be transmitted.
- the transmission unit 2009 includes a plurality of transmission units A to D (the number of which corresponds to the number of multilinks) in order to individually transmit each link of the multilinks and user-multiplexed data. Although four transmitters A to D are shown in FIG. 20 for convenience, the number of transmitters may be three or less or five or more. However, when wireless communication apparatus 1900 is an EMLSR device, transmitter 2009 may be only one transmitter.
- the antenna control unit 2010 controls an antenna that transmits and receives signals.
- Antenna section 2011 includes an antenna element that actually performs transmission and reception operations.
- the antenna unit 2011 is provided with antennas A to D as many as the number of multilinks as required, but the number may be three or less or five or more.
- the detection unit 2012 detects signals received by the antenna unit 2011 .
- the detector 2012 includes a plurality of detectors A to D (the number corresponds to the number of multilinks). In FIG. 20, four detection units A to D are drawn for convenience, but the number of detection units may be three or less or five or more. However, even if the wireless communication device 1900 is an EMLSR device, the same number of detection units as the number of links are prepared.
- the reception unit 2013 performs reception processing on data received via the antenna unit 2011 and the detection unit 2012.
- the receiving unit 2013 includes a plurality of receiving units A to D (the number corresponding to the number of multilinks) for receiving and processing each link of the multilinks and user-multiplexed data. Although four receivers A to D are shown in FIG. 20 for convenience, the number of receivers may be three or less or five or more. However, if wireless communication apparatus 1900 is an EMLSR device, transmitting section 2009 may be only one receiving section.
- the received frame analysis unit 2014 decodes predetermined data from the signals received by the respective receiving units A to D to construct received data.
- the reception sequence management unit 2015 extracts the data (payload) portion from the received frame and manages the received sequence.
- the reception buffer 2016 temporarily stores received data.
- multilink management section 2006 instructs transmission processing for TR and AL, and transmission frame construction section 2004 constructs them as respective transmission frames.
- the wireless communication device 1900 when the wireless communication device 1900 operates as an access point, the RR transmitted from the communication terminal is processed by each of the receiving units A to D for each individual link and individual user, and the received frame analysis unit 2014 Treated as a received frame.
- wireless communication apparatus 1900 when wireless communication apparatus 1900 operates as an access point, it constructs a BA frame according to the reception status of self-addressed data in reception sequence management section 2015 , and constructs a BA frame in transmission frame construction section 2004 .
- radio communication apparatus 1900 operates as a communication terminal and receives a TR
- reception frame analysis section 2014 recognizes TR
- multilink management section 2006 collects TXOP information, and transmits it to the access point.
- An RR is set and an RR frame is constructed in transmission frame constructing section 2004 .
- the wireless communication device 1900 operates as a communication terminal and receives an AL from a connected access point
- the received frame analysis unit 2014 recognizes the AL
- the multilink management unit 2006 assigns it with that AL. Transmission processing is instructed using the UL MU communication resource specified.
- Frame Structure Section H describes the structure of frames used in the wireless LAN system to which the present disclosure is applied.
- FIG. 21 shows the structure of the management frame required for setting the MLO.
- the management frames referred to here include UL Trigger Request (TR) frames, UL Request Response (RR) frames, and UL Allocation (AL) frames.
- TR Trigger Request
- RR UL Request Response
- AL UL Allocation
- the frame shown in FIG. 21 has, as a predetermined MAC (Media Access Control) header, a Frame Control that identifies the frame type, a Duration that indicates the duration of the frame, a Receive Address that designates the receiving device, and a transmitting device. Consists of each field of Transmit Address.
- MAC Media Access Control
- the frame shown in FIG. 21 includes a Multi-User Multi-Link Operation (MU MLO) information element (Information Element) as a MAC payload, and a frame check sequence for data error detection at the end of the frame. (FCS) is added.
- MU MLO Multi-User Multi-Link Operation
- Information Element Information Element
- FCS frame check sequence for data error detection at the end of the frame.
- MU MLO information elements Type indicating the format of the MU MLO frame, Length indicating the information length, and parameters required for actual MLO operation are described.
- the configuration of this MU MLO information element differs for each management frame. Details of the configuration of the information element in each management frame will be given later.
- FIG. 22 shows the correspondence between the values described in the Type field of the MU MLO information element and the frame format corresponding to each value.
- 1 DL Trigger Request
- 2 DL Request Response
- 3 DL Allocation
- 5 UL Trigger Request
- 6 UL Request Response
- 7 UL Allocation.
- FIG. 23 shows the configuration of the MU MLO Information Element field of the UL Trigger Request (TR) frame.
- This information element includes Multi-Link Information indicating parameters related to multi-link operation, Multi-User Information indicating parameters related to multi-user communication, RXOP Max. Duration, RXOP Min., which also indicates the minimum required length. Consists of Duration and other parameters added as necessary.
- RXOP Max On the communication terminal side that received the TR frame, RXOP Max. Based on the information on the maximum length of reception opportunity described in Duration, it is possible to estimate the remaining time of the reception opportunity held by the transmission source of the TR frame. In addition to this, an arbitrary parameter Parameter may be described as necessary.
- the Multi-Link Information field consists of Multi-Link Counts indicating the number of multi-links, Request Multi-Link Bitmap identifying the requested multi-link channel in bitmap format, and 1st indicating link information from 1st to Nth. Consists of parameters such as Link Info to Nth Link Info.
- the Multi-User Information field contains Multi-User Type indicating the method of multi-user multiplexing, Number of Streams indicating the number of multiplexes per link, and Request indicating the number of streams to be simultaneously received by the receiving communication terminal. It consists of parameters such as Streams.
- FIG. 24 shows the configuration of the MU MLO Information Element field of the UL Request Response (RR) frame.
- This information element includes Multi-Link Information indicating parameters related to multi-link operation, Multi-User Information indicating parameters related to multi-user communication, TXOP Max. Duration, TXOP Min., which also indicates the minimum required length. It consists of Duration and other parameters that are added as necessary.
- the Multi-Link Information field indicates the Multi-Link Counts that indicate the number of multi-links, the Available Multi-Link Bitmap that identifies available multi-link channels in bitmap format, and information on the first to Nth links. It consists of parameters such as 1st Link Info to Nth Link Info.
- the Multi-User Information field consists of parameters such as Multi-User Type indicating the method of multi-user multiplexing and Available Streams indicating the number of streams available per link.
- this information element includes, as other parameters, information such as EMLSR/EMLMR that identifies whether the communication terminal is an EMLSR or EMLMR device.
- FIG. 25 shows the configuration of the MU MLO Information Element field of the UL Allocation (AL) frame.
- the ACK Policy parameter can be used to inform allocation of resources for returning block ACKs.
- the Multi-Link Information field contains Multi-Link Counts that indicate the number of multi-links, Allocate Multi-Link Bitmap that identifies the allocated multi-link channels in bitmap format, the bandwidth of the link on which the Allocation frame was transmitted, etc. Consists of parameters such as Multi-Link Allocation corresponding to parameters.
- the Multi-User Information field includes Multi-User Allocation indicating the method of multi-user multiplexing, Number of Streams indicating the number of multiplexes per link, and 1st Used Info to Mth indicating user information from 1st to Mth Consists of parameters such as User Info.
- Each piece of user information is composed of parameters such as Resource indicating the assigned resource and Device identifying the device.
- FIG. 26 shows the configuration of an uplink Block Acknowledgment (BA) frame.
- a BA frame consists of a structure in which information equivalent to a conventional BA frame is described, and includes BA Control and BA Information fields following a predetermined MAC header (same as above), and at the end is an error detection FCS is added.
- the BA Control field consists of BA Ack Policy, BA Type, MLO Control, and TID_INFO parameters.
- BA Type indicates the format of the BA frame.
- FIG. 26 also shows the correspondence between the values described in the BA Type field and the BA frame format corresponding to each value.
- 12: MU MLO is defined as a new BA Type.
- the MLO Control parameters are written as necessary in the bit portion of the BA Control field that has been conventionally reserved.
- This MLO Control contains More Data indicating that more data is required, TXOP/RXOP identifying whether TXOP or RXOP can be set, Multi-Link Counts indicating the number of links that can operate in multi-link, and bits for available links. Consists of parameters such as Available Link bitmap shown in map format.
- Figures 27 and 28 show the operations performed by the access point during uplink communication in the form of flowcharts.
- an operation sequence for activating uplink multi-user multiplexing according to the present disclosure as part of MLO by sending a trigger from the access point is shown in the form of a flow chart.
- the access point acquires the usage status of each link at an arbitrary timing (step S2701), determines whether or not to perform uplink multi-user communication by determining the arrival status of data addressed to itself (step S2702). ).
- the access point sets parameters for multi-user and multi-link (step S2703), and performs multi-link operation on each link. access control (step S2704).
- step S2705 if there is a link on which transmission is possible (Yes in step S2705), the access point transmits a trigger request (TR) frame on that link (step S2706), and the access point When a response (Request Response: RR) frame is received from a communication terminal on the link (Yes in step S2707), the responding communication terminal and response parameters are sequentially stored together with the corresponding link information (step S2708).
- TR trigger request
- RR Response
- the access point transmits this TR frame on all transmittable links.
- step S2705 when the access point finishes receiving RR frames on all transmittable links (Yes in step S2705), the access point acquires information on the RR frames returned from the communication terminal on each link (step S2709), and the EMLSR device (step S2710). In addition, if the response is not from a device such as an EMLSR device that has large restrictions on available links or available resources (No in step S2710), the access point receives a response from a communication terminal in which undelivered data exists. (step S2711).
- the access point preferentially allocates resources in the response link (step S2712). It is configured to appropriately allocate resources (step S2713). In steps S2712 and S2713, the access point sets parameters for multi-link operation based on the allocated resources, and also sets parameters for multi-user communication.
- step S2715 when resource allocation is completed for all communication terminals that have responded (Yes in step S2714), the access point checks whether there are remaining resources (step S2715). Then, if there are remaining resources (step S2715), the access point may allocate resources for data transmission for random access as needed (step S2716).
- the access point generates an AL frame describing parameters related to multilink operation and parameters related to multiuser communication set in step S2712 or S2713, and transmits an Allocation (AL) frame on available links (step S2717). Thereafter, the access point receives uplink multi-user multiplexed data on each link based on the parameters related to multi-link operation and multi-user communication set in steps S2712 and S2713 (step S2718).
- AL Allocation
- the access point checks whether the data (MAC Protocol Data Unit: MPDU) was successfully received (step S2719). If the data was successfully received (Yes in step S2719), the access point stores the data in the reception buffer 2016 (step S2720) and stores the received sequence number as ACK information (S2721). If there is an error in the received data (No in step S2719), subsequent steps S2720 and S2721 are skipped, the received data is not stored, and its sequence number is not stored as ACK information.
- MPDU MAC Protocol Data Unit
- the access point returns to step S2719 and repeats the above reception processing until the processing for all multilink and multiuser multiplexed data is completed (No in step S2722).
- the access point determines whether the reception opportunity (RXOP) setting continues and whether the data requiring retransmission is received. exists (step S2723). If the setting of the RXOP continues (Yes in step S2723), the access point sets the parameters for allocating resources again (step S2724), and if there is unreached data, Block that can identify it.
- ACK (BA) is transmitted using the resource allocated by the ACK Policy parameter of the AL frame (step S2725). Note that the BA frame and the AL frame for the next MLO may be transmitted simultaneously.
- step S2726 If there is undelivered data or if it is necessary to perform uplink multi-user multiplexing (Yes in step S2726), the access point returns to step S2704 and continues uplink multi-user multiplexing operations. do.
- the access point when there is no undelivered data, or when it is determined that normal data reception processing is sufficient without performing uplink multi-user multiplex communication (No in step S2726), the access point end uplink multi-user multiplexing.
- FIGS. 29 and 30 show, in the form of flowcharts, the operations performed by the communication terminal during uplink communication.
- an operation sequence in which a communication terminal activates uplink multi-user multiplexing according to the present disclosure as part of MLO by receiving a trigger from an access point is shown in the form of a flowchart.
- the communication terminal when the communication terminal receives uplink transmission data addressed to the access point from the upper layer of the communication protocol (Yes in step S2901), it stores the data in the transmission buffer 2002 (S2902).
- the communication terminal sets the reception operation on the operation link of the multilink operation (step S2903). Even if the communication terminal is a device such as an EMLSR device that has a large restriction on usable links or usable resources, the predetermined preamble signal detection operation may be performed in multiple links.
- step S2904 when a signal addressed to another network (OBSS) or another communication device is received (Yes in step S2904), the communication terminal sets the link to be in a BUSY state, or sets the link to RTS or CTS.
- OBSS network
- NAV for virtual carrier sense is set according to the Duration time information described therein (step S2905).
- step S2906 When the communication terminal receives a Trigger Request (TR) frame for downlink multi-user multiplex communication from the access point (Yes in step S2906), the communication terminal acquires a parameter for the amount of data in the transmission buffer 2002 (step S2907). Check if uplink data transmission is required on the link (step S2908). Then, if uplink data transmission is necessary (Yes in step S2908), the communication terminal sets uplink transmission parameters (step S2909).
- TR Trigger Request
- step S2910 if the communication terminal is a device such as an EMLSR device that has large restrictions on available links or available resources, or if a link to be used is specified (Yes in step S2910), An RTS frame is transmitted to the access point (step S2911).
- a request response (RR) frame is sent. It transmits (step S2912).
- the communication terminal waits for an Allocation (AL) frame from the access point on the link that transmitted these frames (step S2913).
- AL Allocation
- the communication terminal checks whether or not resources are allocated to itself (step S2914).
- the communication terminal sets parameters for uplink multi-user multiplex communication (step S2917) and acquires data from the transmission buffer 2002. (step S2918), and when the specified timing arrives (Yes in step S2919), uplink multi-user multiplex communication is transmitted (step S2920).
- step S2914 the communication terminal further checks whether there is resource allocation for random access (step S2915). Then, if there is resource allocation for random access (Yes in step S2915), the communication terminal transmits subsequent uplink multi-user communication data according to the transmission parameter settings for random access (step S2916). can do.
- the communication terminal repeats the process of setting the matching transmission data until the transmission timing arrives. .
- step S2921 After transmitting the data, if the communication terminal receives the BA frame from the access point using the resource specified by the ACK Policy parameter of the AL frame (Yes in step S2921), the data from that frame has been received. is obtained (step S2922) and discarded from the transmission buffer 2002 (step S2923).
- the communication terminal when there is data addressed to the access point, the communication terminal repeatedly executes the series of operations described above.
- the communication terminal may appropriately perform communication addressed to the access point when its own transmission opportunity arrives.
- An access point can receive TXOP information from a communication terminal on a receivable link among multilinks and specify a link for performing uplink multi-user multiplex communication for each communication terminal.
- the EMLSR device can also return TXOP information to the access point on the currently used link, and grasp which link is used for uplink communication based on the AL frame from the access point. be able to.
- the access point can identify the link that can be used at that time through the interaction in which the access point transmits a Trigger Request and the communication terminal returns a Request Response.
- the access point was able to allocate the optimum link to each communication terminal based on the situation grasped based on the Request Response sent back from the communication terminal, and used the transmission opportunities obtained by each communication terminal without waste. Multi-link operation can be realized.
- the communication terminal can grasp whether or not retransmission is necessary, and if the transmission line is still available, it will send a response containing the TXOP information again. It can be sent back and communication can be carried out continuously.
- more optimal communication terminals can be obtained by using multi-user multiplex communication technology.
- transmission paths can be utilized without waste.
- each communication terminal notifies an access point of a multilink on which a transmission opportunity can be set, and the access point receives the notified information.
- each communication terminal can allocate links to transmit data, and each communication terminal can achieve uplink multiplexing using the multilink channels available to each other.
- the access point sets transmission opportunities for uplink multiplex communication to each communication terminal under its control and performs data transmission. You can effectively allocate the resources of the links you are using. That is, according to the present disclosure, it is possible to improve the throughput of the entire network by applying it to a network environment in which multilink operation using all channels is difficult.
- the present disclosure is also applied to a network in which multi-link operation using all channels is easy, and the access point selects links for data transmission by each communication terminal according to the amount of data to be transmitted from each communication terminal. Resources can be allocated efficiently to improve throughput across the network.
- the present disclosure is applied to a wireless LAN system based on the IEEE802.11 standard, but the scope of application of the present disclosure is not limited to a specific wireless standard.
- the present disclosure can be applied to various types of wireless networks as well.
- a communication device capable of wireless communication with a plurality of links; a communication processing unit that performs processing for simultaneously receiving data from a plurality of transmission side communication devices; a control unit that performs control for receiving data from each of the plurality of transmission-side communication devices using an optimum link;
- a communication device comprising:
- control unit controls to transmit a trigger request signal requesting information on the transmission opportunity to the plurality of transmission-side communication devices on the link on which the reception opportunity has been obtained;
- the communication device according to (1) above.
- control unit controls to receive a request response signal that responds to the trigger request signal;
- the communication device according to (2) above.
- control unit determines an optimum link for each transmission-side communication device based on request response signals from the plurality of transmission-side communication devices; The communication device according to (3) above.
- control unit prioritizes a request response signal received from a transmission-side communication device having a large communication resource constraint, and determines an optimum link for each transmission-side communication device;
- the communication device according to (4) above.
- the control unit controls to transmit an allocation signal including information on links allocated to each transmitting communication device and information on multi-user multiplex communication.
- the communication device according to any one of (1) to (5) above.
- the control unit controls simultaneous data reception from the plurality of transmission-side communication devices using the plurality of links based on information regarding links assigned to each transmission-side communication device and information regarding multi-user multiplex communication. Control, The communication device according to (4) above.
- the control unit controls to allocate resources for receiving block ACKs to the plurality of transmission-side communication devices.
- the communication device according to any one of (1) to (7) above.
- control unit repeatedly transmits the allocation signal when there is a remaining time of the reception opportunity;
- a communication device capable of wireless communication with a plurality of links; a communication processing unit that performs processing for receiving data addressed to itself among data simultaneously transmitted from a receiving communication device to a plurality of transmitting communication devices; a control unit that notifies the receiving side communication device of a transmission opportunity of a link that can be used by the receiving side communication device and performs control to transmit data simultaneously with other sending side communication devices on the link specified by the receiving side communication device; ,
- a communication device comprising:
- control unit In response to receiving a trigger request signal from the receiving communication device, the control unit controls to return a request response signal on the link that has acquired the transmission opportunity.
- the communication device according to (11) above.
- the control unit performs control so that request response signals are returned from all links for which transmission opportunities have been obtained.
- the communication device according to (12) above.
- control unit controls to transmit a Request To Send signal on the link where transmission is performed.
- the communication device according to any one of (11) to (13) above.
- the control unit controls to wait for a signal on the link that transmitted the request/response signal.
- the communication device according to (12) or (13) above.
- the control unit receives an allocation signal containing information about allocation of transmission resources from the receiving communication device, and uses the resources allocated for its own transmission in the allocation signal to transmit to the receiving communication device. to control the data transmission of The communication device according to any one of (11) to (15) above.
- the control unit performs control to perform data transmission based on resource allocation for random access when no resource is allocated for its own transmission in the allocation signal.
- the communication device according to (16) above.
- the control unit controls to receive a block ACK from the receiving communication device on an arbitrary link.
- the communication device according to any one of (11) to (15) above.
- the control unit waits for a second allocation signal from the receiving communication device when there is a remaining time for the reception opportunity of the receiving communication device.
- the communication device according to any one of (11) to (18) above.
- a communication method in a communication device capable of wireless communication with a plurality of links notifying a receiving communication device of information regarding link transmission opportunities available to it; simultaneously transmitting data destined for the receiving communication device over a link specified by the receiving communication device; communication method.
Abstract
Description
複数のリンクで無線通信可能な通信部と、
複数の送信側通信装置から同時にデータを受信する処理を行う通信処理部と、
前記複数の送信側通信装置の各々から最適なリンクを利用してデータを受信する制御を行う制御部と、
を具備する通信装置である。
前記複数の送信側通信装置の各々に最適なリンクを決定するステップと、
送信側通信装置毎の最適なリンクを利用して、複数の受信側通信装置から同時にデータを受信するステップと、
を有する通信方法である。
複数のリンクで無線通信可能な通信部と、
受信側通信装置から複数の送信側通信装置宛てに同時に送信されたデータのうち自分宛てのデータを受信する処理を行う通信処理部と、
自分が利用可能なリンクの送信機会を前記受信側通信装置に通知して、前記受信側通信装置から指定されたリンクで、他の送信側通信装置と同時にデータを送信する制御を行う制御部と、
を具備する通信装置である。
自分が利用可能なリンクの送信機会に関する情報を受信側通信装置に通知するステップと、
前記受信側通信装置から指定されたリンクで、前記受信側通信装置宛てのデータを、他の送信側通信装置と同時に送信するステップと、
を有する通信方法である。
B.ネットワーク構成
C.MLOに適用したダウンリンクマルチユーザー多重通信
D.AP及びSTAにおけるマルチリンクの利用検出状況
E.ダウンリンクマルチユーザー通信をマルチリンクに適用した実施例
F.各リンクのダウンリンクマルチユーザー多重通信のシーケンス
G.無線通信装置の構成
H.フレーム構成
I.ダウンリンク通信の動作例
J.効果
従来からの無線LANシステムとの互換性を確保する観点から、複数の周波数帯域(リンク)のうち1つで伝送路が利用中であれば、その周波数帯域(リンク)を利用した送信ができないという問題や、周波数帯域(リンク)毎に送信が可能になるタイミングが異なってしまうという問題がある。また、周波数帯域(リンク)毎にランダムバックオフを設定する必要があるが、伝送路が空き状態であるにもかかわらず、ランダムバックオフの設定値によっては各周波数帯域(リンク)で同時に送信が開始されないという問題もある。
(2)各STAは、マルチリンクにおけるTXOPの情報を含むMU-MLO Request ResponseをAPに返送する。
(3)APは、送信側となる各STAから受信したTXOP情報から、STA毎に送信に利用するアップリンクリソースを設定する。
(4)APは、MU-MLOを実施するSTAに対して、MU MLO Allocationで利用するアップリンクのリンクを通知する。
(5)緊急を要するデータや、ランダムアクセス送信用のAllocationを、いくつかのマルチリンクに設定する。
(6)STAは、APからMU-MLO Allocationを受信すると、自分に割り当てられたマルチリンクでアップリンク送信を実施する。
(7)STAは、引き続き利用可否を示すRXOP情報を送信データに含めて送信できる(任意)。
(8)APは、MU MLO Allocationに従って受信を実施し、受信状況に応じてSTA毎にBlock Ackを返送する。
(9)APは、再送が必要な場合には、次のAllocationで未達データの再送を指定してもよい。
図1には、本開示が適用される無線LANシステムのネットワークの状況を例示している。図示の例では、アクセスポイント(AP10)が運営するネットワークであるBasic Service Set 1(BBS1)に、複数の通信端末(STA11~STA14)が接続されている。
図3には、アップリンクマルチユーザー多重通信(UL MU)をMLOに適用した例を示している。図3では、最上段から順にリンク1~リンク4の各リンクでそれぞれアップリンクのマルチユーザー多重通信を実施したときの、APの視点から見たデータ送受信の状態を示している。但し、横軸を時間軸として、リンク1~リンク4のデータ送受信の状態を示している。各時間軸で、上に凸となっている状態は、該当するリンクでAPが送信動作を実施している状態を表し、下に凸になっている状態は該当するリンクでAPが受信動作を実施している状態を表している。
図7には、図1に示した無線LANシステムのAP10における、マルチリンクの利用検出状況の例を示している。図7に示す例では、AP10が、リンク1~リンク4を利用してMLOを実施しようとしている場合に、リンク2のみ他のネットワークからの信号を検出して利用できず、Busy状態になっている。
図12には、図1に示した無線LANシステムのAP10において、アップリンクマルチユーザー通信をマルチリンクに適用した実施例を示している。ここでは、AP10が、図7に示したマルチリンクの利用検出状況下で、図3に示したようなアップリンクマルチユーザー通信を適用した場合を想定した動作を示している。但し、横軸を時間軸として、リンク1~リンク4のデータ送受信の状態を示している。各時間軸で、上に凸となっている状態は、該当するリンクでAP10が送信動作を実施している状態を表し、下に凸になっている状態は該当するリンクでAP10が受信動作を実施している状態を表している。
このF項では、図1に示した無線LANシステムのAP10において、図7~図11に示したような各リンクの利用検出状況を想定した場合の、リンク毎のアップリンクマルチユーザー多重通信のシーケンスについて説明する。
図19には、本開示が適用される無線通信装置1900の機能的構成を模式的に示している。図示の無線通信装置1900は、例えば図1に示した無線LANシステムにおいて、アクセスポイント(AP)として動作することができる。もちろん、無線通信装置1900は、任意のアクセスポイントの配下で通信端末(STA)としても動作できてもよい。
このH項では、本開示を適用した無線LANシステムで使用されるフレームの構成について説明する。
このI項では、本開示が適用される無線LANシステムにおいて、アクセスポイント及び通信端末がアップリンク通信時に実行する動作について説明する。
このJ項では、本開示によってもたらされる効果についてまとめる。
複数の送信側通信装置から同時にデータを受信する処理を行う通信処理部と、
前記複数の送信側通信装置の各々から最適なリンクを利用してデータを受信する制御を行う制御部と、
を具備する通信装置。
上記(1)に記載の通信装置。
上記(2)に記載の通信装置。
上記(3)に記載の通信装置。
上記(4)に記載の通信装置。
上記(1)乃至(5)のいずれかに記載の通信装置。
上記(4)に記載の通信装置。
上記(1)乃至(7)のいずれかに記載の通信装置。
上記(6)又は(7)のいずれかに記載の通信装置。
前記複数の送信側通信装置の各々に最適なリンクを決定するステップと、
送信側通信装置毎の最適なリンクを利用して、複数の受信側通信装置から同時にデータを受信するステップと、
を有する通信方法。
受信側通信装置から複数の送信側通信装置宛てに同時に送信されたデータのうち自分宛てのデータを受信する処理を行う通信処理部と、
自分が利用可能なリンクの送信機会を前記受信側通信装置に通知して、前記受信側通信装置から指定されたリンクで、他の送信側通信装置と同時にデータを送信する制御を行う制御部と、
を具備する通信装置。
上記(11)に記載の通信装置。
上記(12)に記載の通信装置。
上記(11)乃至(13)のいずれかに記載の通信装置。
上記(12)又は(13)のいずれかに記載の通信装置。
上記(11)乃至(15)のいずれかに記載の通信装置。
上記(16)に記載の通信装置。
上記(11)乃至(15)のいずれかに記載の通信装置。
上記(11)乃至(18)のいずれかに記載の通信装置。
自分が利用可能なリンクの送信機会に関する情報を受信側通信装置に通知するステップと、
前記受信側通信装置から指定されたリンクで、前記受信側通信装置宛てのデータを、他の送信側通信装置と同時に送信するステップと、
を有する通信方法。
1902…情報入力モジュール、1903…機器制御モジュール
1904…情報出力モジュール、1905…無線通信モジュール
2001…インターフェース、2002…送信バッファ
2003…送信シーケンス管理部、2004…送信フレーム構築部
2005…ネットワーク管理部、2006…マルチリンク管理部
2007…マルチユーザー多重化処理部
2008…マルチリンクアクセス制御部、2009…送信部
2010…アンテナ制御部、2011…アンテナ部
2012…検出部、2013…受信部
2014…受信フレーム解析部、2015…受信シーケンス管理部
2016…受信バッファ
Claims (20)
- 複数のリンクで無線通信可能な通信部と、
複数の送信側通信装置から同時にデータを受信する処理を行う通信処理部と、
前記複数の送信側通信装置の各々から最適なリンクを利用してデータを受信する制御を行う制御部と、
を具備する通信装置。 - 前記制御部は、受信機会を獲得したリンクにおいて前記複数の送信側通信装置に送信機会に関する情報を要求するトリガー要求信号を送信するように制御する、
請求項1に記載の通信装置。 - 前記制御部は、前記トリガー要求信号に応答する要求レスポンス信号を受信するように制御する、
請求項2に記載の通信装置。 - 前記制御部は、前記複数の送信側通信装置からの要求レスポンス信号に基づいて、送信側通信装置毎の最適なリンクを決定する、
請求項3に記載の通信装置。 - 前記制御部、通信リソースの制約が大きい送信側通信装置から受信した要求レスポンス信号を優先して、送信側通信装置毎の最適なリンクを決定する、
請求項4に記載の通信装置。 - 前記制御部は、送信側通信装置毎に割り当てたリンクに関する情報とマルチユーザー多重通信に関する情報を含むアロケーション信号を送信するように制御する、
請求項1に記載の通信装置。 - 前記制御部は、送信側通信装置毎に割り当てたリンクに関する情報とマルチユーザー多重通信に関する情報に基づいて、前記複数のリンクを用いた前記複数の送信側通信装置からの同時データ受信を制御する、
請求項4に記載の通信装置。 - 前記制御部は、前記複数の送信側通信装置にブロックACKを受信するリソースを割り当てるように制御する、
請求項1に記載の通信装置。 - 前記制御部は、前記受信機会の残り時間がある場合には、前記アロケーション信号を繰り返し送信する、
請求項6に記載の通信装置。 - 複数のリンクで無線通信可能な通信装置における通信方法であって、
前記複数の送信側通信装置の各々に最適なリンクを決定するステップと、
送信側通信装置毎の最適なリンクを利用して、複数の受信側通信装置から同時にデータを受信するステップと、
を有する通信方法。 - 複数のリンクで無線通信可能な通信部と、
受信側通信装置から複数の送信側通信装置宛てに同時に送信されたデータのうち自分宛てのデータを受信する処理を行う通信処理部と、
自分が利用可能なリンクの送信機会を前記受信側通信装置に通知して、前記受信側通信装置から指定されたリンクで、他の送信側通信装置と同時にデータを送信する制御を行う制御部と、
を具備する通信装置。 - 前記制御部は、前記受信側通信装置からトリガー要求信号を受信したことに応答して、送信機会を獲得したリンクで要求レスポンス信号を返送するように制御する、
請求項11に記載の通信装置。 - 前記制御部は、送信機会を獲得できたすべてのリンクで要求レスポンス信号を返送するように制御する、
請求項12に記載の通信装置。 - 前記通信部又は前記通信処理部において通信リソースの制約が大きい場合には、前記制御部は、送信を実施するリンクにおいてRequest To Send信号を送信するように制御する、
請求項11に記載の通信装置。 - 前記制御部は、前記要求レスポンス信号を送信したリンクにおいて信号を待ち受けるように制御する、
請求項12に記載の通信装置。 - 前記制御部は、前記受信側通信装置から送信リソースの割り当てに関する情報を含むアロケーション信号を受信し、前記アロケーション信号において自分の送信に割り当てられたリソースを用いて、前記受信側通信装置へのデータ送信を行うように制御する、
請求項11に記載の通信装置。 - 前記制御部は、前記アロケーション信号において自分の送信にリソースが割り当てられてない場合に、ランダムアクセス用のリソース割り当てに基づいてデータ送信を行うように制御する、
請求項16に記載の通信装置。 - 前記制御部は、前記受信側通信装置からのブロックACKを任意のリンクで受信するように制御する、
請求項11に記載の通信装置。 - 前記制御部は、前記受信側通信装置の受信機会の残り時間がある場合には、前記受信側通信装置からの再度のアロケーション信号を待ち受ける、
請求項11に記載の通信装置。 - 複数のリンクで無線通信可能な通信装置における通信方法であって、
自分が利用可能なリンクの送信機会に関する情報を受信側通信装置に通知するステップと、
前記受信側通信装置から指定されたリンクで、前記受信側通信装置宛てのデータを、他の送信側通信装置と同時に送信するステップと、
を有する通信方法。
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