WO2019153756A1 - 一种多接入点ap协调传输的方法以及相关装置 - Google Patents
一种多接入点ap协调传输的方法以及相关装置 Download PDFInfo
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Definitions
- the present application relates to the field of communications, and in particular, to a method and a related apparatus for coordinated transmission of multiple access point APs.
- WLAN devices are becoming more and more dense.
- APs wireless access points
- increasingly dense APs also bring more inter-cell interference. How to reduce inter-cell interference and improve user service quality through cooperation between APs has become a problem that needs to be considered in next-generation WiFi technology.
- Co-BF Coordinated beamforming
- the co-BF technique can maintain a low correlation between the effective channels, for example, as shown in FIG. 1a, which is a schematic diagram of an exemplary co-BF technology in the prior art, in which AP1 and the station (station, STA) 1 association, AP2 is associated with STA2.
- AP1 needs to obtain channel state information (CSI) of the downlink channel between AP1 and STA1, and then perform joint beamforming according to CSI, so that the beam is directed to STA1. Avoid the direction of STA2, so as to avoid interference with STA2.
- CSI channel state information
- AP2 is the same. Therefore, in the scenario of co-BF, not only the concurrent transmission of two APs but also the interference between the two transmissions can be avoided, and the overall throughput of the network can be effectively improved.
- the acquisition process of the CSI is complicated, and at the same time, it occupies a certain channel resource.
- the CSI feedback is a small overhead.
- the embodiment of the present application provides a multi-access point AP coordinated transmission method and a related device, which are used to solve the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- a first aspect of the present application provides a method for coordinating transmission of a multiple access point AP, including: a first access point AP generates a first radio frame, where the first radio frame includes indication information, and the indication information And indicating a transmission duration of the second radio frame sent by the second access point AP. After the first access point AP generates the first radio frame, the first radio frame is sent to the second access point AP; and the first access point AP is in the sending period of the second radio frame. The first station STA associated with the first access point AP transmits a third radio frame.
- the first access point AP sends the first radio frame to the second access point AP, so that the at least one second access point AP can simultaneously send the transmission duration to the second station STA according to the first radio frame.
- the same second radio frame realizes synchronization of multiple access point APs by transmitting control information, which solves the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- the indication information includes a sending time and an ending time of the second radio frame.
- the first access point AP indicates the sending time and the ending time of the second radio frame to the second access point AP, so that the second access point AP can determine the transmission duration of the second radio frame by using the indication.
- the sending time of the third radio frame is the same as the sending time of the second radio frame.
- the third radio frame and the second radio frame have the same transmission time, and the interference between the first access point AP and the second access point AP is reduced.
- the sending time of the third radio frame is before the sending time of the second radio frame.
- the sending time of the third radio frame may be earlier than the sending time of the second radio frame, and the first station STA and the second station STA may end in the second radio frame and the third radio frame.
- the first station STA retransmits the acknowledgement frame in response to the third radio frame
- the second station STA retransmits the acknowledgement frame in response to the second radio frame.
- the interference value between the first AP and the second AP is reduced when one access point AP is transmitting and the other access point AP is receiving.
- the indication information includes identifier information of the second access point AP.
- the first radio frame may further include the identifier information of the second access point AP, so that the multiple second APs determine whether to participate in the coordinated transmission with the first access point AP according to the identifier information.
- the first radio frame further carries one or more of the following: transmit power information of the second access point AP; a maximum interference threshold that the first access point AP can tolerate Information; identification information of the first station STA; transmission power information of the first station STA; transmission power information of the first access point AP.
- the first radio frame may further carry other multiple indication information, and the function of multi-AP joint resource management is added.
- the second access point AP controls the transmit power of the second station STA by using the maximum access threshold information that the first access point AP can tolerate to the second access point AP, so as to prevent the second station STA from accessing the first access
- the interference value of the point AP exceeds the maximum interference threshold information that the first access point AP can tolerate.
- the second access point AP can predict the interference value of the first station STA to the second access point AP by indicating the identifier information of the first station STA and the sending power information of the first station STA to the second access point AP.
- the interference of the first station STA to the second access point AP can be effectively controlled.
- the transmission duration of the third radio frame is the same as the transmission duration of the second radio frame.
- the first access point AP configures the transmission duration of the second radio frame to be the same as the transmission duration of the third radio frame, so that the end time of the second radio frame may be aligned with the end time of the third radio frame. The interference between the first access point AP and the second access point AP is reduced.
- the method before the first access point AP sends the first radio frame to the second access point AP, the method further includes: the first access point AP determining the second access point AP; An access point AP allocates resource scheduling information to the second access point AP, where the resource scheduling information is used to indicate that the second access point AP sends the channel resource used by the second radio frame.
- the first access point AP allocates, by the second access point AP, the channel resource used by the second access point AP to send the second radio frame, and adds the second access point AP to send the second radio frame. effectiveness.
- the method before the first access point AP sends the first radio frame to the second access point AP, the method further includes: the first access point AP successfully contending to the channel to transmit the first wireless Or the first access point AP receives the request frame sent by the access point AP that successfully contends to the channel, and the request frame is used to request the first access point AP to use the channel to send the first radio frame.
- the first access point AP may contend for the channel to transmit the first radio frame, or may use the channel that the other AP contends to transmit the first radio frame, and increase the first access point AP to transmit the first radio frame. Frame flexibility.
- a second aspect of the present application provides a method for coordinating transmission of a multiple access point AP, including: receiving, by a second access point AP, a first radio frame sent by a first access point AP, where the first wireless The frame includes indication information indicating a transmission duration of the second radio frame; after receiving the first radio frame, sending, by the first access point AP, the first station STA associated with the first access point AP During the transmission period of the three radio frames, the second access point AP transmits a second radio frame to the second station STA associated with the second access point AP.
- the second access point AP receives the first radio frame sent by the first access point AP, so that the at least one second access point AP can send the transmission to the second station STA according to the first radio frame.
- the second radio frame with the same duration is used to synchronize the multiple APs by sending the control information, which solves the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- the indication information includes a sending time and an ending time of the second radio frame.
- the first access point AP indicates, by using the first radio frame, the sending time and the ending time of the second radio frame to the second access point AP, so that the second access point AP can determine the second wireless by using the indication.
- the transmission duration of the frame includes a sending time and an ending time of the second radio frame.
- the sending time of the second radio frame is the same as the sending time of the third radio frame, where the third radio frame is the first access point AP in the second radio frame.
- the first station STA associated with the first access point AP is sent, and the transmission duration of the third radio frame is the same as the transmission duration of the second radio frame.
- the transmission time of the third radio frame and the second radio frame is the same, and the interference between the first access point AP and the second access point AP is reduced.
- the sending time of the second radio frame is before the sending time of the third radio frame.
- the sending time of the second radio frame may be earlier than the sending time of the third radio frame, and the first station STA and the second station STA may end in the second radio frame and the third radio frame.
- the first station STA retransmits the acknowledgement frame in response to the third radio frame
- the second station STA retransmits the acknowledgement frame in response to the second radio frame.
- the interference value between the first AP and the second AP is reduced when one access point AP is transmitting and the other access point AP is receiving.
- the indication information includes identifier information of the second access point AP.
- the first radio frame may further include the identifier information of the second access point AP, so that the multiple second APs determine whether to participate in the coordinated transmission with the first access point AP according to the identifier information.
- the first radio frame further carries one or more of the following: transmit power information of the second access point AP; a maximum interference threshold that the first access point AP can tolerate Information; identification information of the first station STA; transmission power information of the first station STA; transmission power information of the first access point AP.
- the first radio frame may further carry other multiple indication information, and the function of multi-AP joint resource management is added.
- the second access point AP controls the transmit power of the second station STA by using the maximum access threshold information that the first access point AP can tolerate to the second access point AP, so as to prevent the second station STA from accessing the first access
- the interference value of the point AP exceeds the maximum interference threshold information that the first access point AP can tolerate.
- the second access point AP can predict the interference value of the first station STA to the second access point AP by indicating the identifier information of the first station STA and the sending power information of the first station STA to the second access point AP.
- the interference of the first station STA to the second access point AP can be effectively controlled.
- the transmission duration of the second radio frame is the same as the transmission duration of the third radio frame.
- the first access point AP configures the transmission duration of the second radio frame to be the same as the transmission duration of the third radio frame, so that the end time of the second radio frame may be aligned with the end time of the third radio frame. The interference between the first access point AP and the second access point AP is reduced.
- the method before the second access point AP receives the first radio frame sent by the first access point AP, the method further includes: when the second access point AP successfully contends to the channel, the second The access point AP sends a request frame to the first access point AP, where the request frame is used to request the first access point AP to use the channel to send the first radio frame.
- a manner in which the first access point AP accesses the channel is provided, so that the first access point AP can transmit the first radio frame according to the channel that the second access point AP contends.
- the indication information further includes resource scheduling information, where the resource scheduling information is used to indicate that the second access point AP sends the channel resource used by the second radio frame.
- the first access point AP allocates the channel resource used by the second access point AP to send the second radio frame, and increases the efficiency of the second access point AP to send the second radio frame.
- a third aspect of the present application provides a method for coordinated transmission of multiple access point APs, including: a first access point AP generates a first radio frame. After the first radio frame is generated, the first access point AP sends the first radio frame to the second access point AP, where the first radio frame is used to trigger the second access point AP to access the second access point.
- the second station STA associated with the AP sends a second radio frame, where the first radio frame includes first indication information, so that the second access point AP determines the transmission of the second radio frame according to the first indication information. End Time.
- the first access point AP sends the first radio frame to the second access point AP
- the second access point AP is triggered to send the second radio frame to the second station STA
- the second access point AP The transmission end time of the second radio frame may be determined according to the first indication information in the first radio frame, so that multiple second access point APs may end the transmission at the same time, that is, one AP does not send, another AP In the case of reception, interference between APs and between STAs is reduced.
- a fourth aspect of the present application provides a method for coordinating transmission of a multiple access point AP, including: receiving, by a second access point AP, a first radio frame sent by a first access point AP, where the first radio frame carries Determining, by the second access point AP, the transmission end time of the second radio frame according to the first indication information; the second station STA that the second access point AP associates with the second access point AP Sending the second radio frame.
- the second access point AP receives the first radio frame sent by the first access point AP, and determines the transmission end time of the second radio frame according to the first indication information in the first radio frame, which can be implemented.
- the multiple second access point APs end the transmission at the same time, that is, there is no case where one AP is transmitting and another AP is receiving, which reduces interference between the APs and between the STAs.
- the first indication information is used to indicate a transmission end time of the first radio frame or a transmission duration of the first radio frame, and a transmission end time of the first radio frame and the second wireless The transmission end time of the frame is the same. Determining, by the second access point AP, the transmission end time of the second radio frame according to the first indication information, the determining, by the second access point AP, the transmission end time of the first radio frame as the second radio frame The transmission end time; or the second access point AP determines the transmission end time of the first radio frame according to the transmission duration of the first radio frame and the transmission start time of the first radio frame, and the transmission of the first radio frame The end time is equal to the transmission end time of the second radio frame.
- the access point AP when the second access point AP sends the second radio frame with the same transmission end time as the first access point AP sends the first radio frame, the access point does not appear to be sent by the access point.
- an access point correspondingly, there is no case where one station is receiving data, and another station is transmitting an acknowledgment frame, which can avoid interference between access points and interference between stations.
- a fifth aspect of the present application provides a channel information prediction method, including: a first station STA receives a broadcast frame from a first access point AP, where the broadcast frame includes identification information of a second access point AP, and The broadcast frame is used to trigger detection by the first station STA of a channel between the second access point AP and the first station STA.
- the first station STA is associated with the first access point AP.
- the first station STA determines the channel quality information of the target channel according to the received radio frame sent by the target AP, where the target channel is a channel between the target AP and the first station STA, and the target AP is included in the second access Point AP; the first station STA sends a feedback frame to the first access point AP, where the feedback frame includes channel quality information of the target channel.
- the channel quality information of the target channel that is fed back by the first station STA enables the first access point AP to select a suitable MCS when scheduling the first station STA to achieve the transmission rate and the packet loss rate. Balance.
- the broadcast frame may further include sequence indication information, where the sequence indication information is used to indicate that the second access point AP sequentially broadcasts a zero data message NDP.
- the first access point AP may instruct the second access point AP to sequentially send the NDP, so that the first station STA measures the channel information according to the NDP sequentially sent by the multiple second access point APs, and is relative to the first The station STA measures the channel information by receiving the beacon frames sent by the plurality of second access point APs at different times, which is more orderly and efficient.
- the radio frame sent by the target AP may be an NDP
- the first station STA after the first station STA receives the radio frame sent by the target AP, the first station STA sends the feedback frame to the first access point AP.
- the method further includes: the first station STA determining, according to the sequence indication information, which AP is the target AP.
- the first station STA after receiving the radio frame, the first station STA needs to determine, according to the sequence indication information, which AP sends the radio frame, so that the first station STA can make the first connection when feeding back to the first access point AP.
- the ingress AP learns that the channel between the first station STA and which access point is detected.
- the method before the first station STA sends the feedback frame to the first access point AP, the method further includes: the first station STA receiving the trigger frame sent by the first access point AP, where the trigger The frame is configured to trigger the first station STA to send the feedback frame, where the trigger frame includes resource scheduling information, where the resource scheduling information is used to indicate the channel resource used by the first station STA to send the feedback frame; or the first station The STA successfully contends to the channel, which is used to transmit the feedback frame.
- the method for sending a feedback frame by the first station STA including: using a channel resource allocated by the first access point AP to send a feedback frame, or sending a feedback frame by using the contending channel, where The channel resources allocated by the first access point AP are used to send the feedback frame, so that the first STA can use the contention channel, which increases the efficiency of the first station STA to send the feedback frame.
- a sixth aspect of the present application provides a channel information prediction method, including: a first access point AP sends a broadcast frame to a first station STA associated with the first access point AP, and the broadcast frame carries a second Identification information of the access point AP, the broadcast frame is used to trigger the first station STA to detect a channel between the second access point AP and the first station STA.
- the first access point AP receives the feedback frame sent by the first station STA, where the feedback frame carries the channel quality information of the target channel detected by the first station STA, where the target channel is the target AP and the first A channel between the STAs, the target AP is an AP that communicates with the first station STA, and the target AP is included in the second access point AP.
- the first access point AP triggers the first station STA to detect the channel between the second access point AP and the first station STA by using the broadcast frame, and receives the second feedback from the first station STA.
- the channel quality information of the target channel that can be detected by the access point AP, so that the first access point AP can predict the signal to interference ratio of the first station STA according to the channel quality information of the target channel, and then schedule the transmission at the first station STA.
- the first access point AP can select a suitable MCS to achieve a balance between the transmission rate and the packet loss rate.
- the method further includes: determining, by the first access point AP, the channel quality information of the target AP
- the signal-to-interference ratio of the first station STA is SIR.
- the first access point AP determines the SIR of the first station STA, and may select an appropriate MCS when scheduling the first station STA to perform transmission, so as to achieve a balance between the transmission data and the packet loss rate.
- the method before the first access point AP receives the feedback frame sent by the first station STA, the method further includes: the first access point AP sending a trigger frame to the first station STA, where the trigger The frame is configured to trigger the first station STA to send the feedback frame, where the trigger frame carries resource scheduling information, where the resource scheduling information is used to indicate the channel resource used by the first station STA to send the feedback frame.
- the first station STA to send a feedback frame is provided, including using a channel resource allocated by the first access point AP to send a feedback frame, which improves the efficiency of the first station STA to send the feedback frame.
- the broadcast frame further carries sequence indication information, where the sequence indication information is used to indicate an order in which the second access point AP sends the null data packet NDP, so that the first station STA receives the The NDP arrives to perform signal quality detection on the channel between the second access point AP and the first station STA.
- the first access point AP may instruct the second access point AP to sequentially send the NDP, so that the first station STA measures the channel information according to the NDP sequentially sent by the multiple second access point APs, and is relative to the first The station STA measures the channel information by receiving the beacon frames sent by the plurality of second access point APs at different times, which is more orderly and efficient.
- a seventh aspect of the embodiments of the present application provides an apparatus for coordinated transmission of a multiple access point AP, where the apparatus is applied to a first access point AP side, and includes: a processor, configured to generate a first radio frame, where The first radio frame includes indication information indicating a transmission duration of the second radio frame sent by the second access point AP, and the transceiver is configured to send the first radio frame to the second access point AP; And the transceiver is further configured to send the third radio frame to the first station STA associated with the first access point AP during the sending period of the second radio frame.
- the transceiver sends the first radio frame to the second access point AP, so that the at least one second access point AP can simultaneously send the second transmission time to the second station STA according to the first radio frame.
- the wireless frame realizes synchronization of multiple access point APs by sending control information, which solves the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- An eighth aspect of the present application provides an apparatus for coordinated transmission of a multiple access point AP, where the apparatus is applied to a second access point AP side, including: a transceiver, configured to receive a first access point AP Transmitting a first radio frame, where the first radio frame includes indication information of a transmission duration of the second radio frame; and transmitting, by the first access point AP, the third radio to the first station STA associated with the first access point During the transmission period of the frame, the transceiver is further configured to send the second radio frame to the second station STA associated with the second access point AP.
- the transceiver receives the first radio frame sent by the first access point AP, and simultaneously sends the second radio frame with the same transmission duration to the second station STA according to the first radio frame, by sending control information.
- the method achieves synchronization of multiple access point APs, and solves the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- a ninth aspect of the embodiments of the present application provides an apparatus for coordinating transmission of a multiple access point AP, where the apparatus is applied to a first access point AP side, and includes: a processor, configured to generate a first radio frame; And sending, by the second access point AP, a first radio frame, where the first radio frame is used to trigger the second access point AP to send the second radio to the second station STA associated with the second access point AP a frame, where the first radio frame includes first indication information, where the first indication information is used to cause the second access point AP to determine a transmission end time of the second radio frame.
- the transceiver sends the first radio frame to the second access point AP, and triggers the second access point AP to send the second radio frame to the second station STA, so that the second access point AP can be configured according to the
- the first indication information in a radio frame determines the transmission end time of the second radio frame, so that multiple second access point APs can end the transmission at the same time, that is, one AP is not transmitting, and the other AP is receiving. In this case, interference between APs and between STAs is reduced.
- a tenth aspect of the embodiments of the present application provides an apparatus for coordinated transmission of a multiple access point AP, where the apparatus is applied to a second access point AP side, including: a transceiver, configured to receive a first access point AP And a first radio frame, where the first radio frame carries the first indication information, and the determining unit is configured to determine, according to the first indication information, a transmission end time of the second radio frame, where the transceiver is further configured to The second station STA associated with the two access point APs sends the second radio frame.
- the transceiver receives the first radio frame sent by the first access point AP, and the determining unit further determines, according to the first indication information in the first radio frame, a transmission end time of the second radio frame, which may implement multiple
- the second access point AP ends the transmission at the same time, that is, there is no case where one AP is transmitting and another AP is receiving, which reduces interference between the APs and between the STAs.
- An eleventh aspect of the present application provides an apparatus for detecting channel information, where the apparatus is applied to a STA of a first station, and includes: a transceiver, configured to receive a broadcast frame sent by the first access point AP, The broadcast frame includes the identifier information of the second access point AP, where the broadcast frame is used to trigger detection by the first station STA of the channel between the second access point AP and the first station STA, where the first station STA Associated with the first access point AP; the determining unit is configured to determine channel quality information of the target channel according to the received radio frame sent by the target AP, where the target channel is a channel between the target AP and the first station STA The target AP is included in the second access point AP.
- the transceiver is further configured to send a feedback frame to the first access point AP, where the feedback frame includes channel quality information of the target channel.
- the channel quality information of the target channel that is fed back by the first station STA enables the first access point AP to select a suitable MCS when scheduling the first station STA to achieve the transmission rate and the packet loss rate. Balance.
- a twelfth aspect of the embodiment of the present application provides an apparatus for channel information detection, where the apparatus is applied to a first access point AP side, and includes: a transceiver, configured to associate with the first access point AP.
- the first station STA sends a broadcast frame, where the broadcast frame carries the identifier information of the second access point AP, where the broadcast frame is used to trigger the first station STA to be between the second access point AP and the first station STA.
- detecting, by the first station STA, a feedback frame where the feedback frame carries channel quality information of the target channel detected by the first station STA, where the target channel is between the target AP and the first station STA.
- Channel the target AP is included in the second access point AP.
- the transceiver triggers the first station STA to detect the channel between the second access point AP and the first station STA by using the broadcast frame, and receives the second access point AP fed back by the first station STA.
- the channel quality information of the target channel that can be detected, so that the first access point AP can predict the signal to interference ratio of the first station STA according to the channel quality information of the target channel, and then, when scheduling the first station STA for transmission, the first The access point AP can select the appropriate MCS to achieve a balance between the transmission rate and the packet loss rate.
- a thirteenth aspect of the embodiments of the present application provides a communication apparatus having a function of implementing a behavior of a first access point AP or a behavior of a second access point AP in the design of the above method.
- This function can be implemented in hardware or in hardware by executing the corresponding software.
- the hardware or software includes one or more modules corresponding to the functions described above. This module can be software and/or hardware.
- the communication device includes a storage unit, a processing unit, and a communication unit.
- a storage unit for storing program code and data required by the communication device; a processing unit for calling the program code to control and manage the operation of the communication device; and a communication unit for supporting the communication device and other devices Communication.
- the communication device includes a processor, a memory, a baseband circuit, a radio frequency circuit, an antenna, and a bus, wherein the processor, the memory, the baseband circuit, the radio frequency circuit, and the antenna are connected by a bus; A corresponding operation instruction is stored in the memory; the processor controls the operation of the radio frequency circuit, the baseband circuit and the antenna by performing the above operation instruction, thereby supporting the first access point AP or the second access point AP to perform the corresponding function in the foregoing method. .
- Yet another aspect of an embodiment of the present application provides a site having a function of implementing a site in the above method embodiment.
- This function can be implemented in hardware or in hardware by executing the corresponding software.
- the hardware or software includes one or more modules corresponding to the functions described above.
- a station including: a processor, a memory, a bus, a transmitter, and a receiver; the memory is configured to store a computer to execute an instruction, and the processor is connected to the memory through the bus. While the site is running, the processor executes the computer-executable instructions stored by the memory to cause the station to perform the channel information prediction method of any of the above fifth aspects.
- Yet another aspect of an embodiment of the present application provides an apparatus comprising a memory for storing instructions.
- the supporting processor implements the foregoing first access point AP or the second access point AP or the first station STA to perform a corresponding function in the foregoing method, for example, sending or processing the foregoing method.
- the device may include a chip, and may also include a chip and other discrete devices.
- a still further aspect of the present application provides a system including the first access point AP of the foregoing first aspect and the second access point AP of the second aspect; or, including the first of the foregoing third aspect An access point AP and a second access point AP of the fourth aspect; or, comprising the first station STA of the foregoing fifth aspect and the first access point AP of the foregoing sixth aspect; or An access point AP and a second access point AP of the eighth aspect; or, comprising the first access point AP of the foregoing ninth aspect and the second access point AP of the tenth aspect; or, including the foregoing eleventh The first access point AP of the aspect and the second access point AP of the twelfth aspect.
- Yet another aspect of an embodiment of the present application provides a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
- Yet another aspect of an embodiment of the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the methods described in the various aspects above.
- the first access point AP sends the first radio frame to the second access point AP, so that the at least one second access point AP can be simultaneously configured according to the first radio frame.
- 1a is a schematic diagram of an exemplary co-BF technique in the prior art
- FIG. 1b is an exemplary system architecture diagram provided by an embodiment of the present application.
- 2a is a flowchart of an exemplary method for coordinated transmission of multiple access point APs according to an embodiment of the present application
- FIG. 2b is a schematic diagram of a frame format of an exemplary first radio frame according to an embodiment of the present disclosure
- 2c is a schematic diagram of a frame format of another exemplary first radio frame according to an embodiment of the present disclosure
- FIG. 2 is a schematic diagram of an exemplary synchronous and aligned transmission provided by an embodiment of the present application
- 2 e is another schematic diagram of synchronous and aligned transmission provided by an embodiment of the present application.
- FIG. 2 is a schematic transmission diagram of an embodiment of the present application
- FIG. 3a is a flowchart of an exemplary multi-AP coordinated transmission method according to an embodiment of the present application
- FIG. 3b is another schematic diagram of synchronous and aligned transmission provided by an embodiment of the present application.
- FIG. 3c is a schematic diagram of another exemplary synchronous and aligned transmission provided by an embodiment of the present application.
- 4a is a flowchart of an exemplary multi-AP coordinated transmission method according to an embodiment of the present application.
- FIG. 4b is a schematic diagram of an exemplary downlink alignment transmission according to an embodiment of the present disclosure.
- FIG. 4c is a schematic diagram of another exemplary downlink alignment transmission according to an embodiment of the present disclosure.
- FIG. 4 is a schematic diagram of another exemplary downlink alignment transmission according to an embodiment of the present disclosure.
- FIG. 5a is a flowchart of an exemplary information prediction method according to an embodiment of the present application.
- FIG. 5b is a schematic diagram of an exemplary transmission provided by an embodiment of the present application.
- Figure 5c is a frame structure diagram of an exemplary Trigger frame defined by the standard
- FIG. 5d is a schematic diagram of information exemplarily included in a common information part of a common information field in a trigger frame Trigger;
- Figure 5e is a schematic diagram of information that may be included in the User Info portion of the user information field in the Trigger frame;
- FIG. 5 is a schematic structural diagram of a frame of an exemplary broadcast frame according to an embodiment of the present disclosure
- FIG. 5 is a schematic structural diagram of a frame of an exemplary feedback frame according to an embodiment of the present disclosure
- FIG. 5h is a schematic structural diagram of a frame of another exemplary feedback frame according to an embodiment of the present disclosure.
- FIG. 5 is a schematic diagram of a frame structure of another exemplary feedback frame according to an embodiment of the present disclosure.
- FIG. 6 is a schematic structural diagram of an exemplary apparatus for coordinated transmission of multiple APs according to an embodiment of the present disclosure
- FIG. 7 is a schematic structural diagram of another exemplary apparatus for coordinated transmission of multiple APs according to an embodiment of the present disclosure.
- the embodiment of the present application provides a method and a related device for multi-AP coordinated transmission, which are used to solve the problem of occupying more channel resources caused by acquiring CSI in the prior art.
- the embodiment of the present application provides a method for multi-AP coordinated transmission, which can be applied to a wireless local area network, as shown in FIG. 1b, which is an exemplary system architecture diagram provided by an embodiment of the present application, where the system includes at least two wireless technologies. Access points AP1 and AP2, and two stations STA1 and STA2, where STA1 is the site associated with AP1 and STA2 is the site associated with AP2.
- the interaction between the APs and the associated STAs may be used to implement the coordination between the transmissions of the APs and the second APs to solve the problem caused by acquiring CSI in the prior art. The problem of occupying more channel resources and reducing transmission interference.
- the number of APs and STAs in the foregoing WLAN communication system is merely exemplary and does not constitute a limitation on the embodiments of the present application.
- the AP involved in the embodiment of the present application is a device deployed in a wireless communication network to provide a wireless communication function for a station, and can be used as a hub of a WLAN.
- the AP may be a base station, a router, a gateway, a repeater, etc., wherein the base station may include various forms of macro base stations, micro base stations, relay stations, and the like.
- the STA involved in the embodiment of the present application may be a suitable device connected to the distributed network through a wireless link.
- the STA may be a user terminal, a user device, an access device, a mobile station, a user equipment, or other names
- the user terminal may include various handheld devices, in-vehicle devices, and wearable devices (such as smart watches) having wireless communication functions. , smart bracelet, etc.), computing device or other processing device connected to the wireless modem, and various forms of user equipment (UE), mobile station (MS), terminal, terminal equipment ( Terminal equipment), portable communication device (eg cellular GPRS phone), handset, portable computing device, entertainment device, gaming device or system, global positioning system device, ultra wide band (UWB) device, wireless device or configured Any other suitable device for network communication via a wireless medium.
- UE user equipment
- MS mobile station
- Terminal equipment terminal equipment
- portable communication device eg cellular GPRS phone
- UWB ultra wide band
- the embodiments of the present application may have multiple multi-AP coordinated transmission methods according to different scenarios.
- the multi-AP coordinated transmission in the embodiment of the present application refers to two or more APs passing interactive control information. To cooperate with each other to schedule wireless resources.
- the method for coordinated transmission of multiple APs includes the following methods:
- Method A Synchronize and align transmission of multiple APs in downlink transmission.
- Method B Synchronize and align transmission of multiple STAs in uplink transmission.
- Method C Align transmission of multiple APs in downlink transmission.
- the synchronous transmission in the embodiment of the present application can be understood as that multiple transceivers start transmitting respective radio frames at the same time, and the clocks of the multiple transceivers are synchronized.
- a plurality of transceivers include AP01 and AP02, and the clocks of AP01 and AP02 are synchronized. Synchronous transmission between AP01 and AP02, that is, AP01 starts transmitting radio frame 01 at time A, and AP02 also starts transmitting radio frame 02 at time A.
- the alignment transmission in the embodiment of the present application can be understood as that multiple transceiver devices end transmitting the respective radio frames at the same time, and the clocks of the plurality of transceiver devices are synchronized.
- a plurality of transceivers include AP03 and AP04, and the clocks of AP03 and AP04 are synchronized.
- the transmission is synchronized and aligned, that is, multiple transceivers start transmitting respective radio frames at the same time, and end transmitting the respective radio frames at the same time.
- a plurality of transceivers include AP01 and AP02, and the clocks of AP01 and AP02 are synchronized.
- the synchronous transmission between AP01 and AP02, that is, AP01 starts transmitting radio frame 01 at time C, and ends transmitting radio frame 01 at time D.
- AP02 also starts transmitting radio frame 02 at time C and ends transmitting radio frame 02 at time D.
- FIG. 2a an embodiment of a method for performing coordinated multi-AP transmission by method A in the embodiment of the present application is introduced.
- the embodiment may be briefly described in conjunction with the system framework diagram shown in FIG. 1b, and the method may include:
- AP1 sends control information to AP2. After receiving the control information, AP2 sends data to STA2 at a certain interval of 4ms. It should be noted that when AP2 includes multiple APs, each AP2 has the same duration from receiving control information to transmitting data, and the transmission duration of the transmitted data is also the same. That is, when multiple APs start transmitting data at the same time, and the transmitted data has the same transmission duration, the time for ending the transmission of data is also the same, that is, synchronization and alignment transmission of multiple APs in downlink transmission can be realized. Among them, AP1 can also synchronize with multiple AP2s.
- the first AP accesses the channel.
- an AP that initiates multi-AP coordination is referred to as a first AP
- an AP that interacts with the first AP is referred to as a second AP.
- the Wi-Fi frequency band is an unlicensed frequency band
- multiple APs should access the channel in a competitive manner to transmit the wireless frame. It can be described in the following two cases: Case 1, selecting an AP as the first AP; Case 2, any AP may be the first AP.
- the selected AP the first AP
- successfully contends to the channel and transmits a first radio frame over the channel which may be used to initiate multi-AP coordinated transmission.
- the AP that successfully contends to the channel sends a request frame to the first AP, where the request frame is used to request the first AP to access the channel, and send the first wireless through the channel. frame.
- any AP may contend for a channel by using a channel access method, and the AP that competes successfully is the first AP to transmit the first radio frame, thereby triggering multi-AP coordinated transmission. It can be understood that which AP competes for the channel and which AP acts as the first AP to transmit the first radio frame.
- a channel access method based on carrier sense multiple access with collision avoidance (CSMA/CA) is used. Competing channel; in yet another example, the AP may also contend for a channel or a poing coordination function (PCF) based on a request to send/clear to send (RTS/CTS) channel access mechanism, This is not limited here.
- PCF poing coordination function
- the first AP determines the second AP.
- the first AP may determine the second AP participating in the coordination. In this embodiment, the first AP determines the basis of the second AP. In an example, the first AP obtains a received signal strength indication (RSSI) of the neighboring AP, and determines an AP corresponding to the RSSI whose value is included in the first value interval as the second AP.
- RSSI received signal strength indication
- a neighboring AP can be understood as an AP that can communicate with the first AP.
- the first AP determines a physical distance between the first AP and the neighboring AP, and selects a second AP from the first AP. The value of the physical distance of the second AP is in the second value interval.
- the first AP may also determine the thin AP in the neighboring AP as the second AP. It is understood that the AP that needs to be managed, debugged, and controlled by the wireless controller, that is, the thin AP cannot work independently, needs to cooperate with the wireless controller; in another example, the first AP may also determine the second AP based on the service requirement information. Therefore, the manner in which the first AP determines the second AP is not limited herein. It can be understood that the second AP can be one or more APs.
- the step is an optional step, that is, the first AP may also participate in the coordination of the neighboring APs.
- the first AP generates a first radio frame.
- the first AP generates a first radio frame, and the first radio frame is used to initiate coordinated transmission of multiple APs. It should be noted that, in order to implement synchronization and alignment transmission of multiple APs in downlink transmission, the first radio frame includes at least first indication information, and the first indication information is used to indicate to the second AP the transmission duration of the second radio frame.
- the transmission duration in the embodiment of the present application can be understood as the time from the start of transmitting a radio frame to the completion of the transmission of the radio frame, and the transmission duration is related to the size of the radio frame. In actual applications, the transmission duration is There may be other names, such as transmission delays, etc., which are not limited herein.
- the length of the transmission may be directly indicated by a period of time, or may be indicated by a sending time and an ending time of the radio frame, which are not limited herein.
- the first AP generates the first radio frame, so that after receiving the first radio frame, the second AP sends the second radio frame to the second STA associated with the second AP at the first time interval to implement the second radio frame.
- the first duration may be a predefined short inter-frame space (SIFS), or may be customized by the first AP.
- SIFS short inter-frame space
- the first duration is the first AP customization
- the first The indication information of the first duration may also be included in the radio frame.
- the first radio frame may further include second indication information, where the second indication information is used to indicate the identifier information of the second AP, so that After receiving the first radio frame, the second AP determines, according to the second indication information, whether to participate in multi-AP coordinated transmission.
- the identifier information of the second AP may be multiple.
- the identifier information of the second AP may be a media access control (MAC) address of the second AP.
- MAC media access control
- the identifier information of the second AP may be a partial MAC address of the second AP; in still another example, the first AP may be an address allocated by the second AP, or the address determined by the second AP itself and indicated to a first AP, such that the first AP includes the address in the first radio frame, or the identification information of the device (which may be a STA or an AP) in a coupled relationship with the second AP, so that the device receives the first AP. After the frame is sent to the second AP, the device forwards the frame to the second AP through the internal interface of the second AP. Therefore, the identification information of the second AP is not limited herein.
- the first AP may further indicate that the second AP performs channel monitoring within a first time period after receiving the first radio frame, and if the second AP is in the first time period after receiving the first radio frame, The channel between the second AP and the second STA is in an idle state, and the second AP may send the second radio frame to the associated second STA. On the contrary, if the channel between the second AP and the second STA is in the occupied state, the second AP does not send the second radio frame. Therefore, the first radio frame may further include third indication information, where the third indication information is used to indicate whether the second AP needs to be between the second AP and the second STA before sending the second radio frame to the second STA. The channel is listening.
- a 1 bit channel sensing (CS) indicator bit can be set in the first radio frame. For example, when the CS indication bit is set to 1, it indicates that the second AP needs to perform channel monitoring, and the second radio frame is sent to the second STA only when the channel between the second AP and the second STA is idle. When the CS indication bit is set to 0, it indicates that the second AP does not need to perform channel monitoring, that is, after the second AP receives the first radio frame, regardless of whether the channel between the second AP and the second STA is idle, the interval is The second radio frame is sent to the second STA for a while.
- CS channel sensing
- the first radio frame may also carry some control information to help the second AP perform radio resource management, for example:
- the first radio frame may carry the fourth indication information, in order to reduce the interference of the second AP to the first STA associated with the first AP, because the transmission of the first AP and the transmission of the second AP are performed on the same channel.
- the fourth indication information is used to indicate the transmission power information of each second AP, where the transmission power information may be the maximum transmission power or the transmission power configured by the first AP for the second AP, so that the first STA receives the interference from the second AP.
- the value is within a third value interval, wherein the third value interval can be predefined.
- the first radio frame may further carry the fifth indication information, where the fifth indication information is used to indicate Transmit power information of the first AP.
- the first radio frame may carry the sixth indication information, where the sixth indication information is used to indicate the tolerable maximum interference threshold information of the first AP, so that the first The second AP determines, according to the sixth indication information, power indication information of each associated second STA.
- the power indication information is usable for each second STA to determine a maximum transmit power.
- the power indication information may be included in a second radio frame sent by the second AP to the second STA.
- the tolerable maximum interference threshold information may be a value of a spatial reuse parameter (SRP), and the SRP may be used by the second AP to adjust the transmit power when performing spatial multiplexing transmission,
- the second AP may set the transmission parameter of the associated second STA according to the value of the SRP.
- the first radio frame may carry the seventh indication information.
- the eighth indication information is used to indicate the identification information of the first STA, and the eighth indication information is used to indicate the transmission power information of the first STA.
- the first radio frame may be lengthened, so that the second AP decodes and obtains each included in the first radio frame.
- the indication information there is still a certain amount of time to prepare the data until the end of the first radio frame transmission.
- a padding field is added to the first radio frame, and the padding field is filled with invalid information, so the ninth indication information may be included in the first radio frame to indicate the length of the padding field, which is convenient for understanding.
- each AP information field may include an AP ID field and an AP ID field.
- Other information field AP info field.
- an AP info field may be used as a padding domain, and the AP ID of the padding domain may be set to a special AP ID field, such as all 1s or all 0s, to indicate the start of the padding domain, when the second AP detects the
- the special AP ID field can determine the subsequent other information field as the padding invalid information, so the second AP can prepare the data within the time period of receiving the padding field. As shown in FIG.
- FIG. 2c a schematic diagram of a frame format of an exemplary first radio frame provided in this embodiment, where the AP info field adjacent to a frame check sequence (FCS) can be understood
- FCS frame check sequence
- the AP ID special value in the AP info field
- the other information field after the AP ID field in the AP information field contains other information fields that are invalid.
- the first AP may perform centralized scheduling to determine a transmission parameter of the second AP, that is, the first AP allocates and indicates resource scheduling information for the second AP. Therefore, the first radio frame may further carry the tenth indication information, where the tenth indication information is used to indicate resource scheduling information, so that the second AP determines, according to the resource scheduling information, a channel resource used for sending the second radio frame.
- the resource scheduling information may include, but is not limited to, a combination of one or more of the following information: resource unit (RU) allocation information of each second AP, and identifier information of the second AP scheduled site (ie, The identification information of the two STAs, the modulation and coding scheme (MCS) used by each site or the spatial stream used by each site.
- RU resource unit
- MCS modulation and coding scheme
- the first radio frame in the embodiment of the present application may include the eleventh indication information, where the eleventh indication information is used to indicate that the uplink is performed. Transmission or downlink transmission.
- a 1 bit up and down indication bit can be set in the first radio frame. For example, when the uplink and downlink indication bit is set to 0, it indicates that uplink transmission is required, that is, the second AP triggers the second STA to send a radio frame to the second AP. When the uplink and downlink indication bit is set to 1, it indicates that downlink transmission is required, that is, the second AP needs to send a radio frame to the second STA. It should be noted that, in this embodiment, the eleventh indication information is used to indicate that the downlink transmission is performed.
- the first AP may indicate to the second AP before the second AP participates in coordinated transmission.
- the transmission mode, wherein the first AP can have the following indication manners, including:
- the first radio frame includes twelfth indication information for indicating whether synchronization transmission is required.
- the twelfth indication information is used to indicate that synchronization transmission is required. It should be noted that, if the twelfth indication information indicates that multiple APs do not need to transmit in synchronization, that is, the second AP does not need to start transmission at the same time, the second AP may decide the time to start transmission, and the second AP may perform alignment. Transfer, or you can not perform alignment transfer.
- the first radio frame may further include thirteenth indication information, where the thirteenth indication information is used to indicate whether an alignment transmission is needed. If the thirteenth indication information indicates that multiple APs do not need to align transmission, that is, the second AP does not need to end transmission at the same time, the second AP may decide the end time of the transmission.
- the first AP indicates that the second AP indicates the asynchronous transmission or the alignment
- the first radio frame may include the twelfth indication information and the thirteenth indication information.
- the twelfth indication information is used to indicate that multiple APs do not need to transmit synchronously
- the thirteenth indication information is used to indicate that multiple APs do not need to be aligned.
- the first radio frame includes fourteenth indication information, where the fourteenth indication information is used to indicate a mode in which the multi-AP coordinates transmission.
- a 2-bit transmission indication bit can be set in the first radio frame, for example, when the transmission indication bit is 01, indicating that synchronization transmission is required. When the transmission indication bit is 10, it indicates that alignment transmission is required. When the transmission indication bit is 00, it means that the transmission is neither synchronous nor aligned. When the transmission indication bit is 11, it indicates synchronization and alignment transmission. Therefore, the specific indication manner is not limited in this application.
- the first AP may instruct the second AP to send the second radio frame to the second STA, and set the ACK policy to block acknowledgement. (block ACK, BA), so that the second STA does not immediately respond to the BA frame after receiving the second radio frame, but responds after receiving the block ACK request (BAR) frame sent by the second AP.
- block ACK BA
- BA block ACK request
- the first AP instructs the second AP to send the second radio frame to the second STA, and during the sending period of the second radio frame, the first AP sends the third radio frame to the first STA associated with the first AP, That is, the transmission time of the second radio frame may be different from the transmission time of the third radio frame, and the end time of the second radio frame may be different from the end time of the third radio frame, but the transmission period of the second radio frame and the third radio frame may be There is an intersection.
- the transmission period in the embodiment of the present application can be understood as a time period corresponding to a transceiver device from the start of transmitting a radio frame to the completion of transmission of the radio frame.
- time A to time B is the transmission period of the radio frame. Therefore, for ease of understanding, the transmission period of the second radio frame is [time 1 and time 2], the transmission period of the third radio frame is [time 3, time 4], and time 3 is earlier than time 1, time 4 and Time 2 may not be equal, so there is an intersection between the transmission period of the second radio frame and the transmission period of the third radio frame.
- the first AP indicates The second AP sets the ACK policy, so that after the second STA receives the second radio frame, it does not immediately reply to the acknowledgement frame, but after the first radio frame and the second radio frame are both sent, the second AP sends the second AP to the second STA. After confirming the frame request, the second STA sends an acknowledgement frame to the second AP.
- the first radio frame may further carry the fifteenth indication information, where the fifteenth indication information is used to indicate that the ACK policy is carried in the second radio frame.
- the first radio frame may carry multiple indication information in addition to the first indication information, as shown in Table 1.
- the information that the first AP needs to indicate to the second AP is referred to as information to be indicated.
- the to-be-instructed information includes at least the first indication information, and the to-be-instructed information may further include, but is not limited to, a combination of one or more of the indication information shown in Table 1. It should be noted that the to-be-instructed information may be all included in the first radio frame. For example, if the to-be-instructed information includes the first indication information to the fourth indication information, the first radio frame includes the first indication information to the first Four instructions. In an example, the information other than the first indication information in the information to be indicated may not be all included in the first radio frame.
- the information to be indicated includes the first indication information to the fourth indication information
- the first AP determines the second AP that participates in the coordinated transmission
- sends a control frame to the second AP where the control frame includes the second indication information and the third indication information
- the first radio frame triggers transmission of the multi-AP
- the first radio frame includes first indication information and fourth indication information. Therefore, the manner in which the first AP sends the information to be instructed to the second AP is not limited herein.
- the first AP accesses the channel through step 201, determines the second AP by using step 202 and step 203, and generates a first radio frame, and there is no step sequence between the two processes.
- step 201 may be performed first, or step 202 and step 203 may be performed first, or may be performed at the same time, which is not limited herein.
- the second AP receives the first radio frame sent by the first AP.
- the first AP After the first AP accesses the channel, the first AP is sent to the determined second AP to initiate the coordinated transmission of the multiple APs, so that after the second AP receives the first radio frame, the second AP is associated with the second AP.
- the second STA sends the second radio frame, where the transmission duration of the second radio frame is the transmission duration indicated by the first indication information.
- the first duration may be a duration of the first AP customization, or may be a preset duration.
- the first AP in the embodiment may encode, modulate, and map the first radio frame into frames, and fast Fuli.
- the inverse transform and the addition of a cyclic prefix (CP) and the like are then transmitted through the channel to the receiving end, that is, the second AP in the present application.
- the second AP after receiving the first radio frame sent by the first AP, the second AP sequentially performs de-CP, fast Fourier transform, data extraction, channel estimation, equalization, demodulation, and translation on the received first radio frame. Code processing.
- the decoding operation of the encoded first radio frame may be performed by using existing technical means, and details are not described herein again.
- the first radio frame may include multiple indication information
- the second AP participates in coordinated transmission of multiple APs according to the indication information in the first radio frame, as follows:
- the second AP determines, according to the first indication information, a transmission duration of the second radio frame sent to the second STA.
- the second AP determines to participate in the multi-AP coordinated transmission initiated by the first AP according to the second indication information.
- the second AP determines, according to the third indication information, whether the channel between the second AP and the second STA needs to be monitored before sending the second radio frame. If the third indication information indicates that the channel needs to be monitored, the second AP determines whether to send the second radio frame by the state of the monitored channel, that is, does not send when the channel is busy, and vice versa. If the third indication information indicates that the listening channel is not required, the second AP sends the second radio frame directly to the second STA at the first time interval after receiving the first radio frame.
- the second AP determines the sending power information of the second AP according to the fourth indication information, where the sending power information may be the maximum sending power or the first AP configuration.
- the transmit power in this embodiment, when the second AP sends the second radio frame, the transmit power used does not exceed the maximum transmit power. Or the used transmit power is the transmit power configured by the first AP.
- the second AP obtains the sending power information of the first AP according to the fifth indication information, and the second AP predicts the associated information according to the sending power information of the first AP.
- the road loss value can be understood, and the actual application can also be predicted in other ways, which is not limited herein.
- the second AP obtains the tolerable maximum interference threshold information of the first AP according to the sixth indication information, and determines, according to the maximum interference threshold information, each second STA.
- the power indication information is such that each second STA determines the maximum transmit power of the second STA by using the power indication information, that is, controls the transmit power of each second STA, so that the interference value of the second STA to the first AP is at the fourth value. In the interval, therefore, in this embodiment, the transmission power of the second STA when transmitting the BA in response to the second radio frame cannot exceed the maximum transmission power of the second STA.
- the average interference value for the first AP determines the maximum transmission power of the second STA. It should be noted that, in an optional manner, the second AP may directly predict the maximum transmit power of the second STA and indicate to the second STA.
- the second AP may indicate the power indication information to the second STA, such as the maximum interference value of the second STA to the first AP, so that the second STA determines the maximum of the second STA according to the power indication information.
- the transmit power that is, the power indication information sent by the second AP
- the second STA may directly obtain the maximum transmit power of the second STA, and may further calculate the maximum transmit power of the second STA according to the power indication information.
- the second AP determines, according to the identifier information of the first STA in the seventh indication information, and the sending power of the first STA in the eighth indication information.
- the interference value of each first STA to the second AP is the interference value of each first STA to the second AP.
- the second AP determines, by using the ninth indication information, a length of the padding field used to fill the invalid information, that is, the second AP may go within the length of the padding domain. Preparing data to be sent to the second STA.
- the first radio frame may further include a special AP ID field to indicate the start of the padding field. When the second AP detects the special AP ID field, the first AP The two APs can prepare data to be sent to the second STA within the duration of the padding domain.
- the second AP determines the channel resource used by the second radio frame by using the resource scheduling information indicated by the tenth indication information, where the resource scheduling information may be Including, but not limited to, a combination of one or more of the following information: resource unit (RU) allocation information of each second AP, and identification information of the second AP scheduled station (ie, identification information of the second STA), The MCS used by each site or the spatial stream used by each site.
- resource scheduling information may be Including, but not limited to, a combination of one or more of the following information: resource unit (RU) allocation information of each second AP, and identification information of the second AP scheduled station (ie, identification information of the second STA), The MCS used by each site or the spatial stream used by each site.
- RU resource unit
- the second AP determines, by using the eleventh indication information, that the uplink transmission or the downlink transmission is performed.
- the eleventh indication information is used to indicate that the The downlink transmission triggers the second AP to send a second radio frame to the second STA, where the second radio frame may be a data frame or a control frame.
- the second AP determines, by using the twelfth indication information, whether synchronization transmission is required.
- the twelfth indication information is used to indicate that synchronization is required.
- the transmission that is, after the second AP receives the first radio frame, the second radio frame is sent to the second STA at intervals of a preset duration, and synchronous transmission of multiple APs is implemented.
- the second AP determines, by using the twelfth indication information, whether the alignment transmission is needed.
- the thirteenth indication information is used to indicate that alignment is needed. transmission.
- the second AP may determine, by using the fourteenth indication information, a mode of multi-AP coordinated transmission.
- the fourteenth indication information is used to indicate that Synchronize and align the transfer.
- the first radio frame may further include the fifteenth indication information
- the second AP The ACK policy is carried in the second radio frame by using the fifteenth indication information, so that the second STA does not immediately respond to the BA frame after receiving the second radio frame, but after receiving the BAR frame sent by the second AP, Respond to the BA frame.
- the second AP after receiving the first radio frame sent by the first AP, the second AP further sends a first acknowledgement frame in response to the first radio frame to the first AP.
- the first radio frame may further include The transmission duration of the acknowledgment frame is such that after the plurality of second APs receive the first radio frame, the first acknowledgment frame is sent to the first AP at the same interval.
- the second AP sends a second radio frame to the second STA.
- the second AP after receiving the first radio frame, the second AP sends the second radio frame to the second STA at the first time interval.
- the manner in which the second AP sends the second radio frame to the second STA according to the indication information included in the first radio frame is as described in step 204, and details are not described herein again.
- the first AP sends a third radio frame to the first STA.
- the first AP After the first AP sends the first radio frame to the second AP, the first AP sends a third radio frame to the first STA associated with the first AP, and sends a downlink frame to the multi-AP. Alignment, the transmission duration of the third radio frame is equal to the transmission duration of the second radio frame.
- the first AP in order to implement the synchronization of the downlink frame sent by the multiple APs, after the first AP sends the first radio frame, the first AP also sends the third radio frame to the first STA, that is, the sending time of the third radio frame.
- the transmission time of the second radio frame is the same to synchronize the second radio frame with the third radio frame.
- the third radio frame may also include an ACK policy, so that the first STA does not immediately respond to the third acknowledgement frame after receiving the second radio frame, and may be understood as a BA, but receives the BAR sent by the first AP. Respond after the frame.
- an ACK policy so that the first STA does not immediately respond to the third acknowledgement frame after receiving the second radio frame, and may be understood as a BA, but receives the BAR sent by the first AP. Respond after the frame.
- the step is an optional step, that is, the first AP may not send the third radio frame to the first STA, but merely trigger multiple second APs to send the second radio to the second STA.
- the frame in turn, synchronizes and aligns transmission of multiple second APs.
- the first AP sends a third radio frame to the first STA.
- FIG. 2d a schematic diagram of synchronous transmission provided by this embodiment is provided.
- the interval T ms sends a third radio frame to the first STA, that is, Data1 in the figure, optionally, the first The AP then receives the third acknowledgement frame sent by the first STA for responding to the third radio frame, that is, BA1 in the figure.
- the second AP sends a second radio frame, that is, Data2 in the figure, to the second STA, and receives a second acknowledgement frame sent by the second STA for responding to the second radio frame, that is, BA2 in the figure.
- the first AP does not send the third radio frame to the first STA.
- FIG. 2e another synchronization transmission diagram is provided in this embodiment.
- the radio frame is not sent.
- the second AP (1) sends a second radio frame, that is, Data1 in the figure, to the second STA (1), and receives the second acknowledgement frame sent by the second STA (1). That is, BA1 in the figure.
- the second AP (2) also transmits Data2 to the second STA (2) at intervals T ms, and receives the BA2 sent by the second STA (2).
- the second STA sends a second acknowledgement frame to the second AP.
- the second STA After receiving the second radio frame sent by the second AP, the second STA sends a second acknowledgement frame in response to the second radio frame to the second AP.
- the second STA determines the maximum transmit power of the second STA according to the power indication information, and the sending power of the second STA sends the second acknowledgement frame cannot be greater than The maximum transmit power.
- the second STA when the second radio frame includes the ACK policy, the second STA sends the second acknowledgement frame to the second AP after receiving the BAR frame sent by the second AP.
- the step is an optional step, that is, after receiving the second radio frame, the second STA may not send the second acknowledgement frame.
- the first STA sends a third acknowledgement frame to the first AP.
- the first STA after receiving the third radio frame sent by the first AP, the first STA sends a third acknowledgement frame in response to the third radio frame to the first AP.
- the first STA when the third radio frame includes the ACK policy, the first STA sends the third acknowledgement frame to the first AP after receiving the BAR frame sent by the first AP.
- synchronization and alignment transmission of the uplink acknowledgement frame may be implemented, for example, synchronization and alignment transmission of the second acknowledgement frame and the third acknowledgement frame are implemented, For example, when the first AP does not send the third radio frame or the first AP sends the third radio frame but the first STA does not send the third acknowledgement frame, the synchronization between the multiple second acknowledgement frames and the aligned transmission are implemented, as follows:
- the first radio frame may further include a transmission duration of the second acknowledgment frame, and after the second AP obtains the transmission duration of the second acknowledgment frame, the transmission duration of the second acknowledgment frame may be indicated to the second by the second radio frame.
- the STA is configured to enable the second STA to send a second acknowledgement frame to the second AP after the second radio frame is received after receiving the second radio frame.
- the second duration may be preset or may be customized by the first AP, so the second duration may be the same as or different from the first duration, which is not limited herein.
- the third radio frame may include a transmission duration of the third acknowledgment frame, so that the first STA is in the second time interval after receiving the third radio frame.
- An AP sends a third acknowledgement frame, and it should be noted that the transmission duration of the third acknowledgement frame is equal to the transmission duration of the second acknowledgement frame.
- the present embodiment can implement synchronization and alignment transmission between the acknowledgement frames, and there is no case where one STA is transmitting an acknowledgement frame, and another STA is receiving a data frame or a control frame sent by the AP, reducing STA and AP.
- Mutual interference can be implemented.
- the acknowledgment frame that is sent once and received in response to the radio frame may be referred to as one transmission, and in this embodiment, the first radio frame may not only trigger one synchronization. And to align the transmission, it can also trigger multiple synchronizations and align the transmission. As shown in FIG. 2f, an exemplary transmission diagram provided by this embodiment provides synchronization and alignment of multiple transmissions by using a first radio frame.
- the time occupied by each transmission may be referred to as a time period (TS), then the indication information for each time period may be included in the first radio frame, and it may be understood that the indication for each time period is
- the information may include first indication information, and a combination of one or more of the second indication information to the sixteenth indication information.
- the indication information for each time period can be different.
- the transmission duration of Data11 in time segment1 is different from the transmission duration of Data21 in time segment2.
- the indication information of each time period may be the same, for example, the period indication information may be included in the first radio frame, so that the multiple APs use the same indication information for synchronization and alignment transmission every other time segment.
- the multi-AP coordinated scheduling transmission and signaling are implemented by the multi-AP coordinated scheduling, and the synchronous downlink transmission is performed in parallel, thereby reducing interference and improving throughput.
- FIG. 3a an embodiment of the method for performing uplink synchronization and aligning transmission by using method B in the method B is introduced.
- the embodiment may be briefly described in conjunction with the system framework diagram shown in FIG. 1b, and the method may include:
- AP1 sends control information to AP2. After receiving the control information, AP2 sends a trigger message to STA2. After STA2 receives the trigger information, interval B sends data to AP2. It should be noted that when AP2 includes multiple APs, the associated STA2 may also be multiple. The duration of each AP2 from receiving the control information to transmitting the trigger information is the duration A, and the transmission duration of the trigger information sent by each AP2 is also the same. Therefore, the time at which each STA2 receives the trigger information is also the same.
- the duration of each STA2 from receiving the trigger information to transmitting the data is the duration B, and the transmission duration of the data transmitted by each STA2 is also the same, so the time for each STA2 to end the transmission of data is also the same. Therefore, multiple STAs simultaneously start transmitting data and end the transmission of data, so that synchronous transmission of multiple STAs in uplink transmission can be realized.
- the STA1 can also receive the trigger information of the AP1 to synchronize with multiple AP2s.
- the first AP accesses the channel.
- the first AP determines the second AP.
- the steps 301 to 302 are similar to the steps 201 to 202 shown in FIG. 2a, and details are not described herein again.
- the first AP generates a first radio frame.
- the first AP to implement the synchronous transmission of the uplink data, the first AP generates the first radio frame, so that the second AP sends the second radio frame to the second STA at the first time interval after receiving the first radio frame.
- the third radio frame sends the third radio frame to the second AP.
- the second radio frame is a trigger frame.
- the three radio frames may be data frames transmitted by the second STA.
- the first duration and the second duration may be preset, or both are customized by the first AP. When the first duration and the second duration are customized by the first AP, the first radio frame is used.
- the indication information of the first duration and the indication information of the second duration may also be included. Therefore, the second duration may be the same as or different from the first duration, and is not limited herein.
- the first radio frame includes at least a first indication information and a sixteenth indication information, where the first indication information is used to indicate a transmission duration of the second radio frame, where the first indication is The information is similar to the first indication information included in the first radio frame in FIG. 2a, and details are not described herein again.
- the 16th indication information is used to indicate the transmission duration of the third radio frame sent by the second STA. It can be understood that, in order to indicate the transmission duration of the third radio frame to the second STA, the second AP sends the second AP to the second AP.
- the transmission duration of the third radio frame may also be included in the second radio frame of the STA.
- the first radio frame generated by step 303 in this embodiment may also include, but is not limited to, one or more combinations of the indication information shown in Table 2. :
- the second indication information to the eighth indication information are similar to the second indication information to the eighth indication information included in the first radio frame in FIG. 2a, and details are not described herein again.
- the eleventh indication information is used to indicate that the second AP performs uplink transmission, that is, the second STA needs to be triggered to send the third radio frame to the second AP.
- the eleventh indication information to the fourteenth indication information are similar to the twelfth indication information to the fourteenth indication information included in the first radio frame in FIG. 2a, and details are not described herein again.
- the fifteenth indication information is used to indicate an ACK policy, that is, the second AP does not immediately respond to the acknowledgement frame after receiving the third radio frame, but is in the case that the first AP determines that neither the synchronous transmission nor the transmission is performed. After receiving the BAR frame sent by the second STA, the response is received.
- the first AP accesses the channel through step 301, determines the second AP by using step 302 and step 303, and generates a first radio frame, and there is no step sequence between the two processes.
- step 301 may be performed first, or step 302 and step 303 may be performed first, or may be performed at the same time, which is not limited herein.
- the second AP receives the first radio frame sent by the first AP.
- step 304 is similar to step 204 in the embodiment shown in FIG. 2a, and details are not described herein again.
- the second AP sends a second radio frame to the second STA.
- step 305 is similar to step 205 in the embodiment shown in FIG. 2a, and details are not described herein again.
- the second radio frame in this embodiment is used to trigger the second STA to send the third radio frame to the second AP, and the second radio frame may include the transmission duration of the third radio frame.
- the second STA may be a data frame sent by the second AP to the second STA.
- the second STA sends a third radio frame to the second AP.
- the second STA After receiving the second radio frame sent by the second AP, the second STA sends a third radio frame to the second AP for a second duration, and the second duration may be SIFS.
- the second STA determines, according to the power indication information, a maximum transmit power of the second STA, and the power that the second STA sends the third radio frame cannot be greater than the Maximum transmit power.
- the second AP sends a third acknowledgement frame to the second STA.
- the second AP After receiving the third radio frame sent by the second STA, the second AP sends a third acknowledgement frame in response to the third radio frame to the second STA.
- the second AP when the first radio frame includes the ACK policy, the second AP sends the third acknowledgement frame to the second STA after receiving the BAR frame sent by the second STA.
- the second AP when the first radio frame includes the fifth indication information to indicate the transmit power information of the second AP, and the transmit power information may be the maximum transmit power or the transmit power configured by the first AP, the second AP sends the first When the frame is acknowledged, the power used may not exceed the maximum transmit power of the second AP, or the power used may be the transmit power configured by the first AP.
- this step is an optional step, that is, in the actual application, after receiving the third radio frame sent by the second STA, the second AP may not send the second radio frame to the second STA.
- Three confirmation frames are, in the actual application, after receiving the third radio frame sent by the second STA, the second AP may not send the second radio frame to the second STA.
- the first AP sends a fourth radio frame to the first STA.
- the first AP After the first AP sends the first radio frame to the second AP, the first AP sends a fourth radio frame to the first STA associated with the first AP, where the fourth radio frame is used to trigger the first STA.
- the second radio frame After receiving the fourth radio frame, the second radio frame sends a fifth radio frame to the first AP, and the fourth radio frame needs to include the transmission duration of the fifth radio frame.
- the transmission duration of the fourth radio frame is equal to the transmission duration of the second radio frame
- the transmission duration of the fifth radio frame is equal to the transmission duration of the third radio frame.
- the first AP sends a fourth radio frame to the first STA during the sending period of the second radio frame, that is, the first AP sends.
- the fourth radio frame is also sent to the first STA at a first time interval, such that the transmission time of the fourth radio frame is the same as the transmission time of the second radio frame.
- step 206 shown in FIG. 2a it is similar to step 206 shown in FIG. 2a, and details are not described herein again.
- the first AP sends a fourth radio frame to the first STA.
- the first AP sends a first radio frame to the second AP, that is, after the SYNC frame in the figure, the interval T ms is A STA sends a fourth radio frame, that is, a Trigger1 frame in the figure, and receives a fifth radio frame transmitted by the first STA interval P ms, that is, Data1 in the figure.
- the second AP sends a second radio frame, that is, Trigger2 in the figure, to the second STA, and receives the third radio frame sent by the second STA interval P ms, that is, Data2 in the figure.
- the initial transmission time of Data1 and Data2 is the same, and the transmission durations of Data1 and Data2 are the same, the transmission end times of Data1 and Data2 are also the same, so synchronous transmission of uplink data is realized.
- the first AP does not send the fourth radio frame to the first STA.
- FIG. 3c is a schematic diagram of another exemplary synchronization and alignment transmission provided by the embodiment.
- the first AP sends a first radio frame to the second AP, that is, after the SYNC frame in the figure, the wireless device is not sent. frame.
- the second AP(1) sends a second radio frame to the second STA(1), that is, Trigger1 in the figure, and receives the third radio sent by the second STA (1) interval P ms.
- Frame which is Data1 in the figure.
- the second AP (2) also transmits Trigger2 to the second STA (2) at intervals T ms, and receives Data1 transmitted by the second STA (2) interval P ms.
- the first STA sends a fifth radio frame to the first AP.
- the second radio frame sends the fifth radio frame to the second AP.
- the first AP sends a fifth acknowledgement frame to the first STA.
- the first AP may send, to the first STA, a fifth acknowledgement frame that is responsive to the fifth radio frame.
- the first AP may set an ACK policy, so that the first AP sends the fifth acknowledgement frame to the first STA after receiving the BAR frame sent by the first STA.
- synchronization of the downlink acknowledgement frame and alignment transmission may be implemented, that is, synchronization of the third acknowledgement frame and the fifth acknowledgement frame and alignment transmission or Synchronization and alignment transmission between multiple third acknowledgement frames, as follows:
- the first radio frame may further include a fifteenth indication information, where the fifteenth indication information is used to indicate a transmission duration of the third acknowledgement frame, so that the second AP is separated by a third time interval after receiving the third radio frame.
- the second STA sends the third acknowledgment frame.
- the third duration may be a preset duration, or may be customized by the first AP, and may be included in the first radio frame if customized by the first AP.
- the third duration indication may be a preset duration, or may be customized by the first AP, and may be included in the first radio frame if customized by the first AP.
- the first AP after receiving the fifth radio frame, the first AP sends a fifth acknowledgement frame to the first STA, and the third acknowledgement frame is transmitted with the third acknowledgement frame.
- the transmission duration is equal.
- a transmission acknowledgement frame that is synchronized and aligned between the first AP and the second AP can be implemented, and no AP is transmitting an acknowledgement frame, and another AP is receiving a data frame sent by the STA, and the AP is reduced. Interference with STAs.
- the first radio frame in this embodiment may also trigger multiple simultaneous transmissions, and the manner of triggering is the same as the first radio frame in the embodiment shown in FIG. 2a.
- the triggering method is similar, and will not be described here.
- the transmission process and signaling of the coordinated scheduling of multiple APs realize synchronous transmission of uplink data, reduce interference, and improve throughput.
- FIG. 4a an embodiment of the method for performing multi-AP coordination to implement downlink aligned transmission by method C is introduced.
- FIG. 1b can be combined.
- the system frame diagram is shown to briefly describe the embodiment, and the method includes:
- AP1 sends control information to AP2. After receiving the control information, AP2 sends data to STA2 and ends transmitting the data at time C. It should be noted that when AP2 includes multiple APs, the end time for each AP2 to send data to the associated STA2 is C. That is, the end time of multiple APs transmitting data is the same, that is, the aligned transmission of multiple APs in downlink transmission can be realized. Among them, AP1 can also be aligned with AP2.
- the first AP accesses the channel.
- the first AP determines the second AP.
- the steps 401 to 402 are similar to the steps 201 to 202 shown in FIG. 2a, and details are not described herein again.
- the first AP generates a first radio frame.
- the first AP generates a first radio frame, where the first radio frame is used to trigger the second AP to send a second radio frame to the second STA associated with the second AP to initiate coordinated scheduling of the multiple APs.
- the first radio frame includes at least first indication information, and the first indication information is used to enable the second AP to determine a transmission end time of the second radio frame.
- the first indication information included in the first radio frame may also be different, which will be separately described below:
- Scenario 1 The first AP sends a first radio frame to the second AP and the first STA.
- FIG. 4b is an exemplary downlink alignment transmission according to scenario 1 in this embodiment.
- the first AP sends a first radio frame to the first STA, that is, Data1 in the figure.
- the Data1 carries the first indication information, where the first indication information can be used to indicate the transmission duration of Data1, or the transmission end time of Data1, so the second AP obtains the first indication information from Data1 to determine the transmission end time of Data1.
- the first STA after receiving the Data1 sent by the first AP, the first STA sends the BA1 frame to the first AP.
- the second STA sends the BA2 frame to the first AP.
- the first indication information is used to indicate the transmission duration of the first radio frame or the transmission end time of the first radio frame, so that the second AP determines the transmission end time of the second radio frame according to the first indication information.
- the transmission end time of the second radio frame is the same as the transmission end time of the first radio frame.
- Scenario 2 The first AP sends a first radio frame to the second AP, and then sends a third radio frame to the associated first STA.
- FIG. 4c is an exemplary downlink alignment transmission diagram provided by scenario 2 according to the embodiment.
- the first AP sends a first radio frame to the second AP, that is, SYNC in the figure.
- the frame sends a third radio frame to the first STA, that is, Data1 in the figure, where the SYNC frame carries the first indication information, where the first indication information can be used to indicate the transmission duration of Data1, or the transmission end time of Data1, so
- the second AP determines the transmission end time of Data1 according to the first indication information, and sends a second radio frame to the second STA, that is, Data2 in the figure, so that the transmission end time of Data2 is the same as the transmission end time of Data1, and downlink data transmission is realized. Alignment.
- the first STA after receiving the Data1 sent by the first AP, the first STA sends the BA1 frame to the first AP.
- the second STA sends the BA2 frame to the
- the first indication information is used to indicate the transmission duration of the third radio frame or the transmission end time of the third radio frame, so that the second AP determines the transmission end time of the second radio frame according to the first indication information.
- the transmission end time of the second radio frame is the same as the transmission end time of the third radio frame.
- Scenario 3 The first AP sends a first radio frame to the second AP.
- FIG. 4d is an exemplary downlink alignment transmission diagram provided by scenario 3 according to the embodiment.
- the first AP sends a first radio frame to the second AP, that is, SYNC in the figure. a frame, to trigger a plurality of second APs to send a second radio frame, that is, Data in the figure, such as triggering the second AP (1) to send Data1, triggering the second AP (2) to send Data2, where the first radio frame carries the first An indication information, the first indication information is used to indicate the transmission end time of the data sent by each second AP.
- the transmission end time of the Data sent by each second AP is the same.
- the second STA (1) after receiving the Data1 sent by the second AP (1), the second STA (1) sends a BA1 frame to the second AP (1). After receiving the Data2 sent by the second AP (2), the second STA (2) sends a BA2 frame to the second AP (2).
- the first indication information is used to indicate a transmission end time of the second radio frame, so that the multiple second APs determine, according to the first indication information, a transmission end time of each second radio frame, and each The transmission end time of the second radio frame is the same.
- the first radio frame generated by step 403 in this embodiment may further include, but is not limited to, one or more of the indication information shown in Table 3. Combinations:
- the second indication information to the eleventh indication information and the fifteenth indication information are similar to the second indication information to the eleventh indication information and the fifteenth indication information included in the first radio frame in FIG. 2a, specifically I will not repeat them here.
- the twelfth indication information is used to indicate that the second AP does not need to perform synchronous transmission, that is, multiple APs may decide to start transmission at a discretion, as long as the transmission end time is the same.
- the thirteenth indication information is used to indicate that the alignment transmission needs to be performed, that is, the transmission end times of the multiple APs need to be the same.
- the fourteenth indication information is used to indicate that synchronization transmission is not required, and synchronization alignment is required.
- the first AP accesses the channel through step 401, determines the second AP by using step 402 and step 403, and generates a first radio frame, and there is no step sequence between the two processes.
- step 401 may be performed first, or step 402 and step 403 may be performed first, or may be performed at the same time, which is not limited herein.
- the second AP receives the first radio frame sent by the first AP.
- the first indication information in the first radio frame is used to indicate the transmission duration of the first radio frame or the transmission end time of the first radio frame, when the first indication information is used.
- the second AP determines the transmission end time of the first radio frame according to the transmission start time of the first radio frame and the transmission duration of the first radio frame, and ends the transmission of the first radio frame. The time is determined as the transmission end time of the second radio frame transmitted to the second STA.
- the first indication information is used to indicate the transmission end time of the first radio frame
- the second AP directly uses the transmission end time of the first radio frame as the transmission end time of the second radio frame transmitted to the second STA.
- the indication information may be carried in the physical layer preamble of the physical layer protocol data unit where the first radio frame is located.
- the first indication information is used to indicate the transmission duration of the third radio frame or the transmission end time of the third radio frame, and the second AP determines the second radio according to the first indication information.
- the manner of the end time of the transmission of the frame is similar to the manner of determining the end time of the transmission of the second radio frame in the first scenario, and details are not described herein again.
- the first indication information is used to indicate the transmission end time of the second radio frame, and the second AP directly obtains the transmission end time of the second radio frame according to the first indication information.
- the first radio frame further includes, but is not limited to, one or more combinations of the second indication information and the fifteenth indication information in the third table
- the manner in which the second AP receives the first radio frame and performs processing Similar to step 204 shown in FIG. 2a, details are not described herein again.
- the second AP after receiving the first radio frame sent by the first AP, the second AP further sends a first acknowledgement frame in response to the first radio frame to the first AP.
- the corresponding first acknowledgement frame is also multiple, so in order to implement the aligned transmission of the multiple first acknowledgement frames, the first radio frame may further include the end of the transmission of the first acknowledgement frame.
- Time after the plurality of second APs receive the first radio frame, and send, to the first AP, a first acknowledgement frame with the same transmission end time.
- the second AP sends a second radio frame to the second STA.
- the step 405 is similar to the step 205 shown in FIG. 2a, and details are not described herein again.
- the second AP determines the transmission end time of the transmitted second radio frame. In step 205 shown in Figure 2a, the second AP also determines the transmission start time of the second radio frame.
- the first AP sends a fourth radio frame to the first STA.
- the step is an optional step, and the step is described based on three scenarios:
- Scenario 1 The first AP sends a first radio frame to the first STA, that is, the fourth radio frame is the first radio frame.
- the first radio frame is sent to the associated first STA, and the first radio frame is also sent to the second AP to indicate that the second AP performs downlink transmission alignment.
- the transmission end time of the radio frame is the same as the transmission end time of the second radio frame.
- the indication information in the first radio frame may be carried in a physical layer preamble of the first radio frame.
- Scenario 2 The first AP sends a third radio frame to the first STA, that is, the fourth radio frame is a third radio frame.
- the third radio frame is sent to the associated first STA, and the first indication information in the first radio frame is used to indicate the transmission duration or the end of the third radio frame.
- the time is such that the transmission end time of the second radio frame transmitted by the second AP is the same as the transmission end time of the third radio frame.
- Scenario 3 The first AP does not send a radio frame to the first STA.
- the first AP may not send a radio frame to the first STA, but merely trigger multiple second APs to send the second radio frame, and implement aligned transmission of multiple second radio frames.
- the second STA sends a second acknowledgement frame to the second AP.
- the first STA sends a fourth acknowledgement frame to the first AP.
- the steps 407 to 408 are similar to the steps 207 to 408 shown in FIG. 2a, and details are not described herein again.
- the aligned transmission of the uplink acknowledgement frame may be implemented, for example, the aligned transmission of the second acknowledgement frame and the fourth acknowledgement frame, or multiple second acknowledgements.
- the alignment transmission between frames is as follows:
- the first radio frame may further include a transmission end time of the second acknowledgement frame, so that after the second AP obtains the transmission end time of the second acknowledgement frame, the second end of the second acknowledgement frame may be indicated by the second radio frame. Giving the second STA, so that after receiving the second radio frame, the second STA sends a second acknowledgement frame to the second AP, and the transmission end time of the second acknowledgement frame is indicated by the first radio frame.
- the fourth radio frame may include a transmission end time of the fourth acknowledgement frame, where the fourth acknowledgement frame transmits the end time and the second acknowledgement The transmission end time of the frame is the same.
- the embodiment can implement the alignment transmission between the acknowledgment frames, and there is no case where one STA is transmitting an acknowledgment frame, and another STA is receiving a data frame or a control frame, thereby reducing interference between STAs and APs. Interference between.
- the first radio frame in this embodiment may also trigger multiple alignment transmissions, and the manner of triggering is the same as the first radio frame in the embodiment shown in FIG. 2a.
- the triggering method is similar, and will not be described here.
- the multi-AP coordinated scheduling transmission and signaling are implemented by the multi-AP coordinated scheduling, and the coordinated downlink transmission is performed in parallel, thereby reducing interference and improving throughput.
- each AP should know how high the SIR can be obtained by the STAs associated with each AP when the multiple APs transmit in parallel, so that the AP can select the appropriate MCS when scheduling the STAs to transmit.
- a channel information prediction method is provided, which is used to predict the SIR of a station and allocate an appropriate MCS to coordinate the transmission rate and the packet loss rate when the multi-AP coordinated scheduling.
- FIG. 5a is a flowchart of an exemplary information prediction method according to an embodiment of the present application, including:
- the first AP sends a broadcast frame.
- the first AP sends a broadcast frame to all the STAs associated with the first AP, where the broadcast frame is used to indicate to the STA associated with the first AP that the second AP needs to perform signal quality detection, where the broadcast frame carries the second AP. Identification information.
- the second AP includes at least one AP, and the second AP may include the first AP.
- the identifier information of the second AP may be multiple.
- the identifier information of the second AP may be the MAC address of the second AP.
- the identifier information of the second AP may be a partial MAC address of the second AP, or the first AP is an address allocated by the second AP, or an address determined by the second AP itself and indicated to the first AP, so that the first AP includes the address in the broadcast frame, or
- the identification information of the device (which may be a STA or an AP) in a coupling relationship with the second AP, so that the device forwards the frame sent by the first AP to the second AP, and then forwards the internal interface of the device to the second AP. Second AP. Therefore, the identification information of the second AP is not limited herein.
- any one or more of the STAs associated with the first AP are referred to as the first STA, and the first AP sends a broadcast frame to the first STA, which is used to trigger the first STA to the second.
- the channel between the AP and the first STA is detected.
- the broadcast frame may use an existing management frame of the 802.11 standard, such as a beacon frame (Beacon), a Probe Request frame, or the like, and may also use a non-standard vendor-defined frame format, etc., which is not limited herein.
- an existing management frame of the 802.11 standard such as a beacon frame (Beacon), a Probe Request frame, or the like
- Beacon Beacon
- Probe Request frame or the like
- non-standard vendor-defined frame format etc., which is not limited herein.
- the second AP in this embodiment may also receive the broadcast frame sent by the first AP.
- the first STA receives the radio frame sent by the target AP.
- the AP that can communicate with the first STA is referred to as the target AP, and it can be understood that the target AP is part or all of the second AP.
- the first STA receives the radio frame transmitted by the target AP to detect the channel between the first STA and the target AP.
- the radio frame received by the first STA may be sent by the target AP autonomously, or may be sent by the target AP after being triggered by the first AP, which will be separately described below:
- Example 1 A radio frame is autonomously transmitted by the target AP.
- the radio frame may be a beacon frame transmitted by the target AP, and the beacon frame may be used to measure the path loss of the target AP to the beacon frame receiver (ie, the first STA).
- the beacon frame may carry the measurement report of the target AP itself, and the measurement report may include but is not limited to one or more of the following information: the transmit power of the target AP, the signal receiving level and the power of the device around the target AP. .
- Example 2 A radio frame is sent after the target AP is triggered by the first AP.
- the broadcast frame in step 501 is also used to trigger the second AP to sequentially transmit a null data packet (NDP), and the broadcast frame further includes sequence indication information, where the sequence indication information is used to indicate the The order in which the two APs send NDP frames.
- NDP null data packet
- the broadcast frame may be an enhanced-null data packet announcement (E-NDPA) frame.
- E-NDPA enhanced-null data packet announcement
- the second AP after receiving the broadcast frame sent by the first AP, the second AP sends the NDP frame in sequence according to the sequence indication information in the broadcast frame, where the inter-frame interval may be SIFS.
- the inter-frame interval may be a default interval or may be customized by the first AP.
- the broadcast frame further carries indication information of the inter-frame spacing.
- FIG. 5b is an exemplary transmission diagram of the present embodiment.
- AP1 broadcasts an E-NDPA frame (which can be understood as a broadcast frame), so AP1 to AP3 according to the E-NDPA frame.
- the NDP frame is sent in sequence, for example, AP1 sends an NDP1 frame first, AP2 sends an NDP2 frame, and AP3 finally sends an NDP3 frame.
- the AP1 may also send a trigger (Trigger) frame, which is used to trigger the first STA to send a feedback (Feedback) frame. Therefore, after receiving the Trigger frame, the first STA responds according to the received NDP1 frame to the NDP3 frame. Feedback1 frame to Feedback3 frame.
- the broadcast frame may further include identifier information of the STA that needs to detect the channel, and the identifier information of the STA that needs to detect the channel may be a MAC address or an IP address.
- the difference is that in the first example, the first STA receives a radio frame (such as a beacon frame) autonomously transmitted by the second AP, and further detects the channel according to the received signal strength of the beacon frame.
- a radio frame such as a beacon frame
- each second AP sends an NDP frame in the order indicated by the first AP, so that the first AP detects the channel according to the received NDP frame.
- the first STA determines channel quality information of the target channel according to the radio frame.
- the first STA further needs to determine the target AP according to the received NDP frame, including: the first STA according to the second in the broadcast frame.
- the indication information obtains the order in which the second AP sends the NDP frame, and determines the target AP that sends the radio frame by the sequence of the received radio frame. For example, the AP1 first sends the NDP1, and then the AP2 sends the NDP2, and the AP3 sends the NDP3.
- the first STA receives the second NDP, that is, the NDP2
- the first AP sends the NDP frame in the order of the second AP
- the target AP that sends the second NDP is the AP2.
- the first STA determines channel quality information of the target channel (ie, the channel between the first STA and the target AP) according to the radio frame. Specifically, the first STA may obtain a received signal strength indication (RSSI) of the target AP or a transmit power of the target AP according to the measurement report of the target AP carried by the radio frame. Therefore, the channel quality information of the target channel determined by the first STA may be the RSSI of the target AP, the transmission power of the target AP, and the path loss between the target AP and the first STA. In this embodiment, the content of the channel quality information of the target channel may be multiple, which is not limited herein.
- RSSI received signal strength indication
- the content of the channel quality information of the target channel may be multiple, which is not limited herein.
- the first STA needs to calculate the channel quality information by using the transmit power and the RSSI of the target AP, and the specific calculation manner may be:
- Path loss TX Power+Gr+Gt-RSSI, where TX Power represents the transmit power of the target AP, Gr represents the receive antenna gain, Gt represents the transmit antenna gain, RSSI represents the signal receive strength of the target AP, and Gr and Gt are pre- Set the value. It should be noted that, in practical applications, there are various ways to calculate path loss, which will not be repeated here.
- the first STA receives the trigger frame sent by the first AP.
- the first STA may further receive a trigger frame sent by the first AP, where the trigger frame is used to trigger the first STA to send a feedback frame, and the trigger frame may include resource configuration indication information, where the resource configuration indication information is used. Instructing each of the first STAs to reply to the radio channel resource used by the feedback frame, where the resource configuration information may include, but is not limited to, one or more of the following information: RU allocation information of the first STA, spatial flow (spatial and time) Stream, STS) information or orthogonal code.
- the trigger frame generated by the first AP may be designed based on a Trigger frame defined by the 802.11ax standard, as shown in FIG. 5c to FIG. 5c, where FIG. 5c is an exemplary Trigger defined by the 802.11ax standard.
- the frame structure diagram of the frame, the composition of the Trigger frame includes multiple parts, such as Frame Control, Common info, User info, and the like.
- Figure 5d is a schematic diagram of the information contained in the Common info portion of the Trigger frame shown in Figure 5c.
- Figure 5e is a schematic diagram of the information contained in the User Info portion of the Trigger frame shown in Figure 5c.
- Table 4 is an exemplary Trigger Type. Table of correspondence between values and types of subdomains:
- the value of the Trigger Type subfield can be set to a specific value.
- the Trigger Type subfield takes a value between 8 and 15.
- the first STA determines the channel quality information of the target channel by using the steps 502 and 503, and the first STA receives the trigger frame sent by the first AP by using the step 504, and there is no sequence of steps between the two processes.
- step 502 and step 503 may be performed first, or step 504 may be performed first, or may be performed at the same time, which is not limited herein.
- the first STA sends a feedback frame to the first AP.
- the first STA In response to the trigger frame sent by the first AP, the first STA sends a feedback frame to the first AP, where the feedback frame includes channel quality information of the target channel, where the target channel is a channel between the first STA and the target AP.
- the feedback frame includes the identification information of the target AP to indicate to the first AP which AP is detected.
- the identifier information of the target AP may be the MAC address of the target AP.
- the short ID may be used as the identifier of the target AP, and the specific operations are as follows:
- the broadcast frame in the step 501 further includes a fourth indication information, where the fourth indication information is used to indicate a short ID of each second AP, as shown in FIG. 5f, which is a schematic diagram of a frame structure of an exemplary broadcast frame.
- Each AP info field contains a corresponding MAC Address and a Feedback ID (ie, a short ID). Therefore, correspondingly, when the first STA sends the feedback frame to the first AP, the feedback frame carries the short ID indication to indicate the identification information of the target AP, as shown in FIG. 5g, which is a frame structure diagram of an exemplary feedback frame.
- each AP Feedback info field contains a corresponding Feedback ID (ie, short ID) and channel quality information (such as RSSI).
- the channel quality information included in the feedback frame sent by the first STA may be multiple, for example, may include the RSSI of the target AP, and the transmit power information of the target AP, as shown in FIG. 5h, which is an exemplary Schematic diagram of the frame structure of the feedback frame.
- each AP Feedback info field contains the corresponding Feedback ID, TX Power and RSSI.
- the channel quality information may further include a path loss between the first STA and the target AP, where the value of the path loss is calculated by the first STA by using the transmit power and the RSSI of the target AP, as shown in FIG. 5i, being another A schematic diagram of a frame structure of an exemplary feedback frame.
- each AP Feedback info field includes a corresponding feedback ID, path loss, and the like.
- the first STA may receive the NDP frame of the first AP and the second AP, and the first STA may calculate the SIR or the interference signal of the second AP according to the received power of the two NDP frames.
- An interference to signal ratio (ISR) and carries the SIR or ISR of the second AP in the feedback frame.
- the content included in the feedback frame sent by the first STA to the first AP is not limited in this embodiment.
- the first AP predicts an SIR of the first STA according to channel quality information of the target channel.
- the channel quality information of the channel directly or indirectly obtains the path loss between the target AP and the first STA, and then calculates the SIR of the first STA.
- an information prediction method is further provided in the application, including: each AP maintains a listening channel, and obtains an RSSI of each STA (including a STA of the local cell and another STA) according to the result of the monitoring, and then obtains The RSSI information is sent to other APs. After acquiring the RSSI information sent by other APs, each AP can calculate the SIR of each STA in parallel transmission, thereby serving as an input for coordinated scheduling transmission of multiple APs. For ease of understanding, for example, suppose there are two APs, AP1 and AP2, where AP1 is associated with STA1 and AP2 is associated with STA2.
- AP1 will monitor the signals of STA1 and STA2, and AP2 will also monitor the signals of STA1 and STA2.
- AP1 sends the signal strengths of STA1 and STA2 to AP2, if AP2 needs to obtain the SIR of STA2 in parallel transmission, it can be obtained by dividing the signal strength of STA2 monitored by AP2 and the signal strength of STA2 sent by AP1.
- the information prediction method shown in FIG. 5a can be applied not only to the scenario of the multi-AP coordination method in the embodiment of the present application, but also to other scenarios that require information prediction before data transmission.
- the application scenario of the information prediction method provided in FIG. 5a is not limited herein.
- the multi-AP coordination method in the embodiment of the present application has been described above.
- the apparatus for coordinated transmission of multiple access points AP is described in detail below from the perspective of hardware processing.
- FIG. 6 is a schematic structural diagram of a device 600 for multi-access point AP coordinated transmission in the foregoing embodiment.
- the device 600 may be configured as the foregoing first access point AP, and the device 600 may include: 602, computer readable storage medium/memory 603, transceiver 604, input device 605 and output device 606, and bus 601. Among them, a processor, a transceiver, a computer readable storage medium, and the like are connected through a bus.
- the embodiments of the present application do not limit the specific connecting medium between the above components.
- the transceiver 604 is configured to support communication between the first AP and the second access point AP in the foregoing embodiment, and further support the first AP to associate with the first access point AP in the foregoing embodiment. Communication between a STA may perform the transceiving process involving the first AP and/or other processes for the techniques described herein in Figures 2a through 5i.
- the transceiver 604 can be configured to send at least the first radio frame to the second access point AP, where the first radio frame includes indication information for indicating a transmission duration of the second radio frame sent by the second AP.
- the transceiver 604 can also perform step 208 in Figure 2a, step 306 and step 310 in Figure 3a, step 408 in Figure 4a, and step 501, step 504 and step 505 in Figure 5a.
- transceiver 604 can also be used to perform other processes and methods of the techniques described herein.
- the processor 602 is configured to perform control and management on the action of the foregoing first AP, and is used to perform the processing performed by the first AP in the foregoing embodiment, and may perform the processing procedure involving the first AP in FIG. 2a to FIG. 5i and/or Other processes of the techniques described herein may be responsible for managing the bus and executing programs or instructions stored in the memory.
- the processor 602 can perform steps 201 through 203 in FIG. 2a, steps 301 through 303 in FIG. 3a, steps 401 through 403 in FIG. 4a, and step 506 in FIG. 5a.
- the computer readable storage medium/memory 603 stores programs, instructions or data for carrying out the technical solutions of the present application.
- computer readable storage medium/memory 603 can include instructions sufficient to allow device 600 to transmit a first wireless frame to one or more second APs, and can also include sufficient to allow device 600 to transmit during the second wireless frame.
- the first station STA sends an instruction for the third radio frame, and may further comprise other means sufficient to allow the apparatus 600 to implement the transceiving process involving the first AP in FIGS. 2a through 5i, the processing procedure, and/or the techniques described herein. process.
- FIG. 6 only shows a simplified design of the first AP.
- the first AP can include any number of transceivers, processors, memories, etc., and all can implement the first application of the present application. APs are all within the scope of this application.
- FIG. 7 is a schematic structural diagram of a device 700 for multi-access point AP coordinated transmission in the foregoing embodiment.
- the device 700 may be configured as the foregoing second AP, and the device 700 includes: a processor 702, a computer The storage medium/memory 703, the transceiver 704, the input device 705 and the output device 706, and the bus 701 are read.
- a processor, a transceiver, a computer readable storage medium, and the like are connected through a bus.
- the embodiments of the present application do not limit the specific connecting medium between the above components.
- the transceiver 704 is configured to support communication between the second AP and the first AP, and further support communication between the second AP and one or more second STAs associated with the second access point AP in the foregoing embodiment. Communication or interaction processes involving the second AP in Figures 2a through 4d and/or other processes for the techniques described herein may be performed.
- the transceiver 704 can be configured to receive the first radio frame that is sent by the first AP, and can also be used to send the second radio frame to the second STA after the first radio frame.
- the transceiver 704 is further configured to perform step 204, step 205, and step 207 in FIG. 2a, step 304 to step 307 in FIG. 3a, and step 404, step 405, and step 407 in FIG. 4a.
- transceiver 904 can also be used to perform other processes and methods of the techniques described herein.
- the processor 702 is configured to perform control management on the action of the second AP, and is used to perform the processing performed by the second AP in the foregoing embodiment, and may perform the processing involving the second AP in FIG. 2a to FIG. 4d and/or Other processes of the techniques described herein may be responsible for managing the bus and executing programs or instructions stored in the memory.
- computer readable storage medium/memory 703 can include instructions sufficient to allow device 700 to receive a first wireless frame transmitted by the first AP described above, and can also include sufficient to allow device 700 to receive a second wireless frame after receiving the first wireless frame
- the instructions to transmit the second radio frame may also include other processes sufficient to allow the apparatus 700 to implement the transceiving process, processing, and/or techniques described herein with respect to the second AP of Figures 2a through 4d.
- FIG. 7 only shows a simplified design of the second AP.
- the second AP can include any number of transceivers, processors, memories, etc., and all can implement the second of the present application. APs are all within the scope of this application.
- the processor involved in the foregoing apparatus 600 and apparatus 700 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a network processor (NP), a microprocessor, etc., or may be an application-specific integrated circuit (application). -specific integrated circBIt, ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. It can also be a digital signal processor (DSP), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component.
- DSP digital signal processor
- FPGA field-programmable gate array
- the controller/processor may also be a combination of computing functions, such as one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
- the processor typically performs logical and arithmetic operations based on program instructions stored in the memory.
- the computer readable storage medium/memory 603 and the computer readable storage medium/memory 703 referred to above may also hold an operating system and other applications.
- the program can include program code, the program code including computer operating instructions.
- the above memory may be a read-only memory (ROM), other types of static storage devices that can store static information and instructions, random access memory (RAM), storable information, and Other types of dynamic storage devices, disk storage, and the like.
- the memory 603 can be a combination of the above types of storage.
- the computer readable storage medium/memory described above may be distributed in the processor, external to the processor, or on multiple entities including the processor or processing circuitry.
- the computer readable storage medium/memory described above may be embodied in a computer program product.
- a computer program product can include a computer readable medium in a packaging material.
- device 600 and device 700 may also be configured as a general purpose processing system, such as generally referred to as a chip, the general purpose processing system including: one or more microprocessors providing processor functionality; and an external portion providing at least a portion of the storage medium Memory, all of which are connected to other supporting circuits through an external bus architecture.
- the general purpose processing system including: one or more microprocessors providing processor functionality; and an external portion providing at least a portion of the storage medium Memory, all of which are connected to other supporting circuits through an external bus architecture.
- the memory stored instructions are executed by the processor, causing the processor to perform the multi-AP coordinated transmission method of the first AP in the embodiment illustrated in Figures 2a to 4d, and the channels in the embodiments described in Figures 5a to 5i
- Some or all of the steps of the information prediction method such as step 201 to step 203 in FIG. 2a, step 301 to step 303 in FIG. 3a, step 401 to step 403 in FIG.
- the processor is caused to perform some or all of the steps of the multi-AP coordinated transmission method of the second AP in the embodiment described in Figures 2a to 4d, and/or other processes for the techniques described herein.
- causing the processor to perform some or all of the steps of the channel information prediction method of the first STA in the embodiment described in Figures 5a to 5i, such as step 503 in Figure 5a, and/or for use in the present application Other processes of technology.
- the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
- the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
- An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
- the storage medium can also be an integral part of the processor.
- the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the user equipment.
- the processor and the storage medium can also exist as discrete components in the user equipment.
- the embodiment of the present application further provides a device, which may be a chip, and the device may include a memory, wherein the memory is used to store instructions.
- the disclosed system, apparatus, and method may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .
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Abstract
Description
Claims (47)
- 一种多接入点AP协调传输方法,其特征在于,包括:第一接入点AP生成第一无线帧,其中,所述第一无线帧包含用于指示第二接入点AP发送的第二无线帧的传输时长的指示信息;所述第一接入点AP向所述第二接入点AP发送所述第一无线帧;所述第一接入点AP在所述第二无线帧的发送期间内,向与所述第一接入点AP关联的第一站点STA发送第三无线帧。
- 根据权利要求1所述的方法,其特征在于,所述指示信息包括所述第二无线帧的发送时间和结束时间。
- 根据权利要求1或2所述的方法,其特征在于,所述第三无线帧的发送时间和所述第二无线帧的发送时间相同。
- 根据权利要求1或2所述的方法,其特征在于,所述第三无线帧的发送时间在第二无线帧的发送时间之前。
- 根据权利要求1至4中任一项所述的方法,其特征在于,所述指示信息包括所述第二接入点AP的标识信息。
- 根据权利要求1至5中任一项所述的方法,其特征在于,所述第一无线帧中还携带以下中的一个或者多个:所述第二接入点AP的发送功率信息;所述第一接入点AP可容忍的最大干扰门限信息;所述第一站点STA的标识信息;所述第一站点STA的发送功率信息;和所述第一接入点AP的发送功率信息。
- 根据权利要求1至6中任一项所述的方法,其特征在于,所述第三无线帧的传输时长与所述第二无线帧的传输时长相同。
- 一种多接入点AP协调传输方法,其特征在于,包括:第二接入点AP接收第一接入点AP发送的第一无线帧,其中,所述第一无线帧包含用于指示第二无线帧的传输时长的指示信息;在所述第一接入点AP向与所述第一接入点AP关联的第一站点STA发送第三无线帧的发送期间内,所述第二接入点AP向与所述第二接入点AP关联的第二站点STA发送所述第二无线帧。
- 根据权利要求8所述的方法,其特征在于,所述指示信息包括所述第二无线帧的发送时间和结束时间。
- 根据权利要求8或9所述的方法,其特征在于,所述第二无线帧的发送时间和所述第三无线帧的发送时间相同。
- 根据权利要求8或9所述的方法,其特征在于,所述第二无线帧的发送时间在所述第三无线帧的发送时间之前。
- 根据权利要求8至11中任一项所述的方法,其特征在于,所述指示信息包括所述第二接入点AP的标识信息。
- 根据权利要求8至12中任一项所述的方法,其特征在于,所述第一无线帧中还携带以下中的一个或者多个:所述第二接入点AP的发送功率信息;所述第一接入点AP可容忍的最大干扰门限信息;所述第一站点STA的标识信息;所述第一站点STA的发送功率信息;和所述第一接入点AP的发送功率信息。
- 根据权利要求8至13中任一项所述的方法,其特征在于,所述第二无线帧的传输时长与所述第三无线帧的传输时长相同。
- 一种用于多接入点AP协调传输的装置,所述装置应用于第一接入点AP侧,其特征在于,所述装置包括:处理器,用于生成第一无线帧,其中,所述第一无线帧包含用于指示第二接入点AP发送的第二无线帧的传输时长的指示信息;收发器,用于向所述第二接入点AP发送所述第一无线帧;所述收发器,还用于在所述第二无线帧的发送期间内,向与所述第一接入点AP关联的第一站点STA发送第三无线帧。
- 根据权利要求15所述的装置,其特征在于,所述指示信息包括所述第二无线帧的发送时间和结束时间。
- 根据权利要求15或16所述的装置,其特征在于,所述第三无线帧的发送时间和所述第二无线帧的发送时间相同。
- 根据权利要求15或16所述的装置,其特征在于,所述第三无线帧的发送时间在第二无线帧的发送时间之前。
- 根据权利要求15至18中任一项所述的装置,其特征在于,所述指示信息包括所述第二接入点AP的标识信息。
- 根据权利要求15至19中任一项所述的装置,其特征在于,所述第一无线帧中还携带以下中的一个或者多个:所述第二接入点AP的发送功率信息;所述第一接入点AP可容忍的最大干扰门限信息;所述第一站点STA的标识信息;所述第一站点STA的发送功率信息;所述第一接入点AP的发送功率信息。
- 根据权利要求15至20中任一项所述的装置,其特征在于,所述第三无线帧的传输时长与所述第二无线帧的传输时长相同。
- 一种用于多接入点AP协调传输的装置,所述装置应用于第二接入点AP侧,其特征在于,包括:收发器,用于接收第一接入点AP发送的第一无线帧,其中,所述第一无线帧包含用于指示第二无线帧的传输时长的指示信息;在所述第一接入点AP向与所述第一接入点AP关联的第一站点STA发送第三无线帧的发送期间内,所述收发器,还用于向与所述第二接入点AP关联的第二站点STA发送所述第 二无线帧。
- 根据权利要求22所述的装置,其特征在于,所述指示信息包括所述第二无线帧的发送时间和结束时间。
- 根据权利要求22或23所述的装置,其特征在于,所述第二无线帧的发送时间和所述第三无线帧的发送时间相同。
- 根据权利要求22或23所述的装置,其特征在于,所述第二无线帧的发送时间在所述第三无线帧的发送时间之前。
- 根据权利要求22至25中任一项所述的装置,其特征在于,所述指示信息包括所述第二接入点AP的标识信息。
- 根据权利要求22至26中任一项所述的装置,其特征在于,所述第一无线帧中还携带以下中的一个或者多个:所述第二接入点AP的发送功率信息;所述第一接入点AP可容忍的最大干扰门限信息;所述第一站点STA的标识信息;所述第一站点STA的发送功率信息;所述第一接入点AP的发送功率信息。
- 根据权利要求22至27中任一项所述的装置,其特征在于,所述第二无线帧的传输时长与所述第三无线帧的传输时长相同。
- 一种多接入点AP协调传输的方法,其特征在于,包括:第一接入点AP生成第一无线帧;所述第一接入点AP向第二接入点AP发送所述第一无线帧,其中,所述第一无线帧用于触发所述第二接入点AP向与所述第二接入点AP关联的第二站点STA发送第二无线帧,其中,所述第一无线帧包含第一指示信息,以使得所述第二接入点AP根据所述第一指示信息确定所述第二无线帧的传输结束时间。
- 一种多接入点AP协调传输的方法,其特征在于,包括:第二接入点AP接收第一接入点AP发送的第一无线帧,所述第一无线帧携带有第一指示信息;所述第二接入点AP根据所述第一指示信息确定第二无线帧的传输结束时间;所述第二接入点AP向所述第二接入点AP关联的第二站点STA发送所述第二无线帧。
- 根据权利要求30所述的方法,其特征在于,所述第一指示信息用于指示该第一无线帧的传输结束时间或者所述第一无线帧的传输时长,所述第一无线帧的传输结束时间与所述第二无线帧的传输结束时间相同;所述第二接入点AP根据所述第一指示信息确定第二无线帧的传输结束时间包括:所述第二接入点AP将所述第一无线帧的传输结束时间确定为所述第二无线帧的传输结束时间;或,所述第二接入点AP根据所述第一无线帧的传输时长和所述第一无线帧的传输开始时间确定所述第一无线帧的传输结束时间,所述第一无线帧的传输结束时间与所述第二无 线帧的传输结束时间相等。
- 一种信道信息预测方法,其特征在于,包括:第一站点STA从第一接入点AP接收广播帧,其中,所述广播帧包含第二接入点AP的标识信息,且所述广播帧用于触发所述第一站点STA对第二接入点AP与第一站点STA之间信道的检测,所述第一站点STA与所述第一接入点AP关联;所述第一站点STA根据接收到的目标AP发送的无线帧确定目标信道的信道质量信息,所述目标信道为所述目标AP与所述第一站点STA之间的信道,所述目标AP包含于所述第二接入点AP;所述第一站点STA向所述第一接入点AP发送反馈帧,所述反馈帧包含所述目标信道的信道质量信息。
- 根据权利要求32所述的信道信息预测方法,其特征在于,所述广播帧还可以包含有顺序指示信息,其中,所述顺序指示信息用于指示所述第二接入点AP顺序广播零数据报文NDP。
- 根据权利要求33所述的信道信息预测方法,其特征在于,所述目标AP发送的无线帧为零数据报文NDP,在所述第一站点STA接收所述目标AP发送的无线帧之后,在所述第一站点STA向所述第一接入点AP发送反馈帧之前,所述方法还包括:所述第一站点STA根据所述顺序指示信息确定所述目标AP。
- 根据权利要求32-34任一所述的信道信息预测方法,其特征在于,在所述第一站点STA向所述第一接入点AP发送反馈帧之前,所述方法还包括:所述第一站点STA接收所述第一接入点AP发送的触发帧,其中,所述触发帧用于触发所述第一站点STA发送所述反馈帧,所述触发帧包含资源调度信息,所述资源调度信息用于指示所述第一站点STA发送所述反馈帧所使用的信道资源;或,所述第一站点STA成功竞争到信道,所述信道用于发送所述反馈帧。
- 一种信道信息预测方法,其特征在于,包括:第一接入点AP向所述第一接入点AP关联的第一站点STA发送广播帧,所述广播帧携带有第二接入点AP的标识信息,所述广播帧用于触发所述第一站点STA对所述第二接入点AP与所述第一站点STA之间的信道进行检测;所述第一接入点AP接收所述第一站点STA发送的反馈帧,所述反馈帧携带有所述第一站点STA检测到的目标信道的信道质量信息,其中,所述目标信道为目标AP与所述第一站点STA之间的信道,所述目标AP为与所述第一站点STA进行通信的接入点AP,且所述目标AP包含于所述第二接入点AP。
- 根据权利要求36所述的信道信息预测方法,其特征在于,在所述第一接入点AP接收所述第一站点STA发送的反馈帧之后,所述方法还包括:所述第一接入点AP根据所述目标AP的信道质量信息确定所述第一站点STA的信干比SIR。
- 根据权利要求36或37所述的信道信息预测方法,其特征在于,在所述第一接入点AP接收所述第一站点STA发送的反馈帧之前,所述方法还包括:所述第一接入点AP向所述第一站点STA发送触发帧,所述触发帧用于触发所述第一站点STA发送所述反馈帧,所述触发帧中携带有资源调度信息,所述资源调度信息用于指示所述第一站点STA发送所述反馈帧所使用的信道资源。
- 根据权利要求36-38任一所述的信道信息预测方法,其特征在于,所述广播帧还携带有顺序指示信息,所述顺序指示信息用于指示所述第二接入点AP发送空数据分组NDP的顺序,以使得所述第一站点STA根据接收到的所述NDP对所述第二接入点AP与所述第一站点STA之间的信道进行信号质量检测。
- 一种用于多接入点AP协调传输的装置,所述装置应用于第一接入点AP侧,包括:处理器,用于生成第一无线帧;收发器,用于向第二接入点AP发送第一无线帧,所述第一无线帧用于触发所述第二接入点AP向所述第二接入点AP关联的第二站点STA发送第二无线帧;其中,所述第一无线帧包含第一指示信息,所述第一指示信息用于使得所述第二接入点AP确定所述第二无线帧的传输结束时间。
- 一种用于多接入点AP协调传输的装置,所述装置应用于第二接入点AP侧,包括:收发器,用于接收第一接入点AP发送的第一无线帧,所述第一无线帧携带有第一指示信息;确定单元,用于根据所述第一指示信息确定第二无线帧的传输结束时间;所述收发器,还用于向所述第二接入点AP关联的第二站点STA发送所述第二无线帧。
- 一种用于信道信息检测的装置,所述装置应用于第一站点STA侧,包括:收发器,用于接收第一接入点AP发送的广播帧,所述广播帧包含第二接入点AP的标识信息,所述广播帧用于触发所述第一站点STA对所述第二接入点AP与所述第一站点STA之间信道的检测,所述第一站点STA与所述第一接入点AP关联;确定单元,用于根据接收到的目标AP发送的无线帧确定目标信道的信道质量信息,所述目标信道为所述目标AP与所述第一站点STA之间的信道,所述目标AP包含于所述第二接入点AP;所述收发器还用于,向所述第一接入点AP发送反馈帧,所述反馈帧包含所述目标信道的信道质量信息。
- 一种用于信道信息检测的装置,所述装置应用于第一接入点AP侧,包括:收发器,用于向第一接入点AP关联的第一站点STA发送广播帧,所述广播帧携带有第二接入点AP的标识信息,所述广播帧用于触发所述第一站点STA对所述第二接入点AP与所述第一站点STA之间的信道进行检测;接收所述第一站点STA发送的反馈帧,所述反馈帧携带有所述第一站点STA检测到的目标信道的信道质量信息,所述目标信道为目标AP与所述第一站点STA之间的信道,所述目标AP包含于所述第二接入点AP。
- 一种装置,所述装置包括:存储器,所述存储器用于存储指令;当所述存储器存储的指令被处理器执行时,支持所述处理器实现如权利要求1-14、29-39任意一项所述的方法中相应的功能。
- 一种计算机可读存储介质,包括指令,当其在计算机上运行时,使得计算机执行如权利要求1-14、29-39任意一项所述的方法。
- 一种包含指令的计算机程序产品,当其在计算机上运行时,使得计算机执行如权利要求1-14、29-39任意一项所述的方法。
- 一种装置被配置用于执行权利要求1至权利要求14,权利要求29至权利要求39中任一项所述的方法。
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US12004196B2 (en) | 2024-06-04 |
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JP2021513783A (ja) | 2021-05-27 |
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