WO2022095949A1 - 一种信道侦听的方法以及相关装置 - Google Patents
一种信道侦听的方法以及相关装置 Download PDFInfo
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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Definitions
- the present application relates to the field of communication technologies, and in particular, to a method for channel listening and a related device.
- Wireless Local Area Network commonly known as Wireless-Fidelity (Wi-Fi) communication network
- Wi-Fi Wireless-Fidelity
- 802.11be has been defined by a multi-link device (MLD), that is, a device that supports multi-link communication.
- MLD multi-link device
- AP access Point
- STA stations
- a multi-link device has the ability to transmit and receive at the same time (Simultaneous transmitting and receiving, STR), or can not transmit and receive at the same time (Non-Simultaneous transmitting and receiving, NSTR).
- MLDs can be divided into STR MLDs and non-STR MLDs according to whether they have the ability to transmit and receive simultaneously (simultaneous transmitting and receiving, STR) on different links.
- a link may refer to the spatial path of the MLD for data transmission in a frequency band, the STR MLD has the STR capability, and the NSTR MLD does not have the STR capability.
- An MLD can work on two or more links. After the NSTR MLD sends a physical layer protocol data unit (Physical Protocol Data Unit, PPDU) on one link, the sent PPDU will affect the channel listening on the other link, so the other link cannot transmit the PPDU. In order to avoid mutual interference between links, a new channel listening method needs to be proposed, so that NSTR MLD can synchronize multi-link communication.
- PPDU Physical Protocol Data Unit
- Embodiments of the present application provide a method for channel listening and a related device. By adjusting the channel listening time, the influence of the sending action of other links on the channel listening result can be avoided, so as to realize the error recovery of the link in the scenario where the multi-link device NSTR MLD cannot transmit and receive at the same time.
- an embodiment of the present application proposes a method for channel listening, which is applied to NSTR MLDs that cannot transmit and receive multi-link devices at the same time, including:
- a station of an NSTR MLD sends a PPDU and performs channel listening within an inter-frame interval less than or equal to PIFS, where the difference between PIFS and the time length of channel listening is in the range of 0-4 microseconds, Or 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds;
- the value range of the difference between PIFS and the time length of channel listening is 0-4 microseconds (assuming that the difference value is t, that is, the value range of t is [0,4] ), in other words, the value range of the time length of channel listening is [PIFS-4, PIFS].
- the above-mentioned difference value range is 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds, a similar explanation can be made, and details are not repeated here.
- a station of the NSTR MLD after receiving the BA, performs channel listening within an inter-frame interval less than or equal to PIFS, where the difference between PIFS and the time length of channel listening is in the range of 0-4 ⁇ m. seconds, or 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds;
- the value range of the difference between PIFS and the time length of channel listening is 0-4 microseconds (assuming that the difference value is t, that is, the value range of t is [0,4] ), in other words, the value range of the time length of channel listening is [PIFS-4, PIFS].
- the above-mentioned difference value range is 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds, a similar explanation can be made, and details are not repeated here.
- the waiting time length is less than or equal to the inter-frame interval of PIFS, and then sends the next PPDU. seconds, or 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds;
- a station of NSTR MLD sends the next PPDU after the waiting time length is less than or equal to the inter-frame interval of PIFS after receiving the BA, wherein the difference between the PIFS and the waiting time length ranges from 0 to 4 micrometers. seconds, or 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds;
- a station of NSTR MLD waits for a certain period of time after sending a PPDU, and then performs channel listening within a certain inter-frame interval. and less than or equal to PIFS;
- a station of the NSTR MLD waits for a certain period of time after receiving the BA, and then performs channel monitoring within a certain inter-frame interval. and less than or equal to PIFS.
- a station of the NSTR MLD after a station of the NSTR MLD sends a PPDU, it performs channel listening within an inter-frame interval greater than or equal to SIFS, where the difference between the time length of channel listening and the SIFS ranges from 0 to 4 micrometers. seconds, or 0-8 microseconds;
- the value range of the difference between the time length of channel listening and the SIFS is 0-4 microseconds (assuming that the difference is t, that is, the value range of t is [0,4] ), in other words, the value range of the time length of channel listening is [SIFS, SIFS+4].
- a station of the NSTR MLD performs channel listening within an inter-frame interval greater than or equal to SIFS after receiving the BA, where the difference between the time length of channel listening and the SIFS is 0-4 microseconds, or 0 -8 microseconds;
- the value range of the difference between the time length of channel listening and the SIFS is 0-4 microseconds (assuming that the difference is t, that is, the value range of t is [0,4] ), in other words, the value range of the time length of channel listening is [SIFS, SIFS+4].
- a station of NSTR MLD sends the next PPDU after the waiting time length is greater than or equal to the inter-frame interval of SIFS after sending the PPDU, where the difference between the waiting time length and SIFS is 0-4 microseconds, or 0 -8 microseconds;
- a station of the NSTR MLD sends the next PPDU after the waiting time length is greater than or equal to the inter-frame interval of SIFS after receiving the BA, where the difference between the waiting time length and SIFS is 0-4 microseconds, 0- 8 microseconds;
- a station of the NSTR MLD waits for a certain length of time after sending a PPDU, and then performs channel listening within an inter-frame interval greater than or equal to SIFS, and the waiting time length is 0-8 microseconds;
- a station of the NSTR MLD waits for a certain period of time after receiving the BA, and then performs channel listening within the inter-frame interval greater than or equal to the SIFS, and the waiting period is 0-8 microseconds.
- an embodiment of the present application proposes a method for channel listening, which is applied to a device NSTR MLD that cannot transmit and receive multiple links at the same time.
- the method includes:
- the road device includes a first station STA and a second station STA, wherein the first STA transmits the first frame on the first link, the second STA transmits the second frame on the second link, and the first frame is an acknowledgment block BA , the second frame is BA, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that at least one of the first frame and the second frame fails to transmit;
- Channel listening is performed at the first inter-frame interval, where the time length of the first inter-frame interval is less than or equal to the time length of the point coordination function inter-frame interval PIFS, or, after the second frame ends, the second STA will Channel listening is performed at the inter-frame interval, wherein the time length of the second inter-frame interval is greater than or equal to the time length
- BA can be understood as a reply frame.
- the reply frame may also include an acknowledgement (ACK).
- BA in this application can also be replaced by ACK. That is to say, the BA in this application only means a reply frame, and the reply frame does not necessarily have to be a BA, but can also be an ACK.
- the reply frame may also be other types of frames, which are not limited here.
- the NSTR MLD after receiving an erroneous reply frame (BA or ACK), the NSTR MLD can adjust the channel listening time, so as to prevent the sending action of other links from affecting the channel listening result. At the same time, the inter-frame interval is made to meet the communication requirements.
- BA or ACK erroneous reply frame
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits the second frame on the second link, the first frame is the confirmation block BA, the second frame is the BA, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that at least one of the first frame and the second frame has failed to transmit
- the first STA After the first frame ends, the first STA performs channel listening at the first inter-frame interval, where the time length of the first inter-frame interval is less than or equal to the time length of the point coordination function inter-frame interval PIFS.
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits the second frame on the second link, the first frame is the confirmation block BA, the second frame is the BA, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that at least one of the first frame and the second frame has failed to transmit
- the second STA After the second frame ends, the second STA performs channel listening at the second inter-frame interval, where the time length of the second inter-frame interval is greater than or equal to the time length of the short frame interval SIFS and less than or equal to the time length of the PIFS.
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits the second frame on the second link, the first frame is the confirmation block BA, the second frame is the BA, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that at least one of the first frame and the second frame has failed to transmit
- the first STA After the first frame ends, the first STA performs channel listening at the first inter-frame interval, where the time length of the first inter-frame interval is less than or equal to the time length of the point coordination function inter-frame interval PIFS, and the second STA is in the first inter-frame interval. After the end of the two frames, channel listening is performed at the second inter-frame interval, wherein the time length of the second inter-frame interval is greater than or equal to the time length of the short frame spacing SIFS and less than or equal to the time length of the PIFS.
- the time length of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time may be 0-4 microseconds, or 0-8 microseconds.
- the value range of the first time may be 0-9 microseconds, or 0-12 microseconds.
- the time length of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time can be 0-4 microseconds. It should be noted that when the value range of the first time is 0-4 microseconds, the next frame ( For example, PPDU) interferes with the second STA, and the difficulty of listening may not be increased.
- the next frame For example, PPDU
- the value range of the first time may also be 0-8 microseconds.
- the next frame (eg PPDU) sent by the first STA can be prevented from causing interference to the second STA. And, it can be guaranteed that the next frame (eg PPDU) sent by the first STA is aligned with the next frame (eg PPDU) sent by the second STA.
- the difficulty of listening may not be increased.
- the value range of the first time can also be 0-9 microseconds, or, it can also be 0-12 microseconds.
- the first STA sends the next frame (eg, PPDU) (the next frame (eg, PPDU)) from causing interference to the second STA. And, it can be guaranteed that the next frame (eg PPDU) sent by the first STA is aligned with the next frame (eg PPDU) sent by the second STA. At the same time, the requirement that the current inter-frame interval is greater than or equal to the SIFS is satisfied.
- the 4us before sending the next frame (eg PPDU) is the transition from the receiving state to the sending state, therefore, the 4us is not used for channel monitoring.
- the second frame is 8us ahead of the first frame, the inter-frame interval after the first frame is PIFS-12 (microseconds), which will not affect the channel sensing of the first STA.
- the time interval between the first frames is the difference between the PIFS and the first time
- the value range of the first time is 0-4 microseconds.
- the value range of the first time may be either 0-8 microseconds, or 0-9 microseconds, or 0-12 microseconds.
- the time of the second inter-frame interval is the sum of the short frame spacing SIFS and the second time;
- the value range of the second time is 0-4 microseconds.
- the value range of the second time may be 0-8 microseconds.
- the time of the second inter-frame interval is the sum of the short frame spacing SIFS and the second time;
- the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- the time of the second inter-frame interval is the sum of the short frame spacing SIFS and the second time ;
- the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- an embodiment of the present application proposes a method for channel listening.
- the method is applied to a multi-link device NSTR MLD that cannot transmit and receive at the same time.
- the method includes:
- a multi-link device that cannot transmit and receive at the same time includes a first station STA and a second station STA, where the first STA transmits the first frame on the first link, the second STA transmits the second frame on the second link, and the first STA transmits the first frame on the first link.
- the frame is a physical layer protocol data unit PPDU, the second frame is a PPDU, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines the frame that fails to transmit, and the frame that fails to transmit is the first frame and the second frame;
- the first STA After the first frame ends, the first STA performs channel listening at the third inter-frame interval, and the third inter-frame interval is less than or equal to the time length of the PIFS;
- the second STA performs channel listening at a fourth inter-frame interval, where the fourth inter-frame interval is less than or equal to the time length of the PIFS.
- the channel listening time can be adjusted so as to prevent the sending action of other links from affecting the channel listening result.
- the inter-frame interval is made to meet the communication requirements.
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits a second frame on the second link, the first frame is a physical layer protocol data unit PPDU, the second frame is a PPDU, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that the transmission of the first frame and the second frame failed
- the first STA After the first frame ends, the first STA performs channel listening at a third inter-frame interval, where the third inter-frame interval is less than or equal to the time length of the PIFS.
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits a second frame on the second link, the first frame is a physical layer protocol data unit PPDU, the second frame is a PPDU, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that the transmission of the first frame and the second frame failed
- the second STA After the second frame ends, the second STA performs channel listening at a fourth inter-frame interval, where the fourth inter-frame interval is greater than or equal to the time length of the short frame interval SIFS and less than or equal to the time length of the PIFS.
- the multi-link devices that cannot transmit and receive simultaneously include a first station STA and a second station STA, where the first STA transmits the first frame on the first link , the second STA transmits a second frame on the second link, the first frame is a physical layer protocol data unit PPDU, the second frame is a PPDU, and the end time of the first frame is later than the end time of the second frame;
- NSTR MLD determines that the transmission of the first frame and the second frame failed
- the first STA After the first frame ends, the first STA performs channel listening at the third inter-frame interval, and the third inter-frame interval is less than or equal to the time length of the PIFS;
- the second STA After the second frame ends, the second STA performs channel listening at a fourth inter-frame interval, where the fourth inter-frame interval is greater than or equal to the time length of the short frame interval SIFS and less than or equal to the time length of the PIFS.
- the time of the third inter-frame interval is the difference between the PIFS and the third time
- the value range of the third time is 0-4 microseconds, or, the value range of the third time is 0-8 microseconds, or the value range of the third time is 0-9 microseconds.
- the value range of the third time may be 0-12 microseconds.
- the time of the fourth inter-frame interval is the sum of the short frame interval SIFS and the fourth time;
- the value range of the fourth time is 0-4 microseconds, or the value range of the fourth time is 0-8 microseconds.
- the second STA after the second frame ends, performs channel listening at a fifth inter-frame interval after a fifth time period, wherein the fifth inter-frame interval The sum of the time length of and the fifth time is less than or equal to the time length of PIFS.
- the value range of the fifth time is 0-8 microseconds.
- an embodiment of the present application proposes a method for channel listening.
- the method is applied to a multi-link device NSTR MLD that cannot transmit and receive at the same time, and the method includes:
- a multi-link device that cannot transmit and receive at the same time includes a first station STA and a second station STA, where the first STA transmits the first frame on the first link, the second STA transmits the second frame on the second link, and the first STA transmits the first frame on the first link.
- the frame is an acknowledgement block physical layer protocol data unit PPDU, the second frame is a PPDU, and the end time of the first frame is later than the end time of the second frame;
- the second STA After the second frame ends, the second STA performs channel monitoring at the sixth inter-frame interval, where the time of the sixth inter-frame interval is the sum of the confirmation timeout AckTimeout and the sixth time.
- the value range of the sixth time is 0-4 microseconds.
- the method further includes:
- the second STA After the second frame ends, the second STA performs channel listening at the seventh inter-frame interval after a seventh time period, and the sum of the seventh time and the seventh inter-frame interval is equal to the time length of the sixth inter-frame interval.
- the value range of the seventh time is 0-8 microseconds.
- the channel listening time can be adjusted, thereby avoiding the sending action of other links and affecting the channel listening result.
- the inter-frame interval is made to meet the communication requirements.
- an embodiment of the present application proposes a method for sending a Multiple User-Request To Send (MU-RTS) frame.
- the method is applied to the MLD at the sending end, and the method includes:
- the sending end MLD When one station of the sending end MLD sends a MU-RTS, another station of the sending end MLD sends another frame, and the value range of the difference between the end time of the MU-RTS and the end time of the other frame is 0- 4 microseconds; the other frame may be a MU-RTS frame or another frame.
- the end time of the MU-RTS is later than the end time of the other frame.
- the difference between the end time of the MU-RTS and the end time of the other frame is not limited.
- the sending end MLD includes a first access point AP and a second AP, wherein the first AP transmits the first multi-user request-to-send frame MU-RTS on the first link.
- the sending end MLD includes a first access point AP and a second AP, wherein the first AP transmits the first multi-user request to send on the first link frame MU-RTS, the second AP transmits the second multi-user request to send frame MU-RTS on the second link;
- the difference between the end time of the first MU-RTS and the end time of the second MU-RTS is at most 4 microseconds.
- the first AP is AP1
- the second AP is AP2
- the first link is link 1
- the second link is link 2
- the first MU-RTS is MU-RTS1
- the second MU-RTS is MU-RTS2.
- the maximum difference between the end time of MU-RTS1 and the end time of MU-RTS2 is 4 microseconds
- the maximum difference between the start time of Clear to Send (CTS) frame 1 and CTS2 is also 4 microseconds. Therefore, the interference of the CTS frame (CTS1) sent in advance to the other link (link 2) will not affect the channel sensing result on the other link.
- STA2 in the receiving end MLD can send CTS2 normally.
- the interference between reply frames (CTS) of the MU-RTS is avoided, and the normal transmission of the CTS is ensured.
- an embodiment of the present application proposes a method for sending a CTS frame, the method is applied to a receiving end MLD, and the method includes:
- the time interval for channel listening before sending the CTS is SIFS+T, where T is 0-4 microseconds or T is 0-8 microseconds.
- the receiving end MLD includes a first access point STA, where the first STA receives the first MU-RTS on the first link;
- the first STA sends the first clear-to-send frame CTS on the first link.
- the start time of the first CTS is different from the end time of the first MU-RTS by an eighth inter-frame interval, and the time length of the eighth inter-frame interval is greater than or Equal to the length of time of SIFS.
- the time interval before the receiving end MLD sends the CTS frame is agreed, so as to avoid interference between the CTS frames on different links and ensure the normal sending of the CTS.
- the time of the eighth inter-frame interval is the sum of the eighth time and the SIFS, and the value range of the eighth time is 0-4 microseconds, or the eighth time The value range of time is 0-8 microseconds.
- the first STA performs channel sensing within the eighth inter-frame interval.
- the receiving end MLD further includes a second access point STA, wherein the second STA receives the second MU-RTS on the second link, and the second MU - the end of the RTS is later than the first MU-RTS;
- the second STA sends a second clear-to-send frame CTS on the second link, and the start time of the second CTS is SIFS different from the end time of the second MU-RTS.
- a communication apparatus for implementing the above-mentioned various methods.
- the communication device may be the NSTR MLD in the above-mentioned first to third aspects, or a device including the above-mentioned NSTR MLD, or a device included in the above-mentioned NSTR MLD, such as a system chip.
- the communication device may be the transmitter MLD in the fourth aspect, or a device including the transmitter MLD, or a device included in the transmitter MLD, such as a system chip.
- the communication device may be the receiver MLD in the fifth aspect, or a device including the receiver MLD, or a device included in the receiver MLD, such as a system chip.
- the communication device includes corresponding modules, units, or means (means) for implementing the above method, and the modules, units, or means may be implemented by hardware, software, or by executing corresponding software in hardware.
- the hardware or software includes one or more modules or units corresponding to the above functions.
- a communication device comprising: a processor and a memory; the memory is used for storing computer instructions, and when the processor executes the instructions, the communication device executes the method of any one of the above-mentioned aspects.
- the communication device may be the NSTR MLD in the above-mentioned first to third aspects, or a device including the above-mentioned NSTR MLD, or a device included in the above-mentioned NSTR MLD, such as a system chip.
- the communication device may be the transmitter MLD in the fourth aspect, or a device including the transmitter MLD, or a device included in the transmitter MLD, such as a system chip.
- the communication device may be the receiver MLD in the fifth aspect, or a device including the receiver MLD, or a device included in the receiver MLD, such as a system chip.
- a communication device comprising: a processor; the processor is configured to be coupled with a memory, and after reading an instruction in the memory, execute the method according to any of the above-mentioned aspects according to the instruction, and the memory and the communication device communicate with each other.
- the communication device may be the NSTR MLD in the above-mentioned first to third aspects, or a device including the above-mentioned NSTR MLD, or a device included in the above-mentioned NSTR MLD, such as a system chip.
- the communication device may be the transmitter MLD in the fourth aspect, or a device including the transmitter MLD, or a device included in the transmitter MLD, such as a system chip.
- the communication device may be the receiver MLD in the fifth aspect, or a device including the receiver MLD, or a device included in the receiver MLD, such as a system chip.
- a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the instructions are executed on a communication device, the communication device can perform the method of any one of the above-mentioned aspects.
- the communication device may be the NSTR MLD in the above-mentioned first to third aspects, or a device including the above-mentioned NSTR MLD, or a device included in the above-mentioned NSTR MLD, such as a system chip.
- the communication device may be the transmitter MLD in the fourth aspect, or a device including the transmitter MLD, or a device included in the transmitter MLD, such as a system chip.
- the communication device may be the receiver MLD in the fifth aspect, or a device including the receiver MLD, or a device included in the receiver MLD, such as a system chip.
- the communication device may be the NSTR MLD in the above-mentioned first to third aspects, or a device including the above-mentioned NSTR MLD, or a device included in the above-mentioned NSTR MLD, such as a system chip.
- the communication device may be the transmitter MLD in the fourth aspect, or a device including the transmitter MLD, or a device included in the transmitter MLD, such as a system chip.
- the communication device may be the receiver MLD in the fifth aspect, or a device including the receiver MLD, or a device included in the receiver MLD, such as a system chip.
- a communication apparatus for example, the communication apparatus may be a chip or a chip system
- the communication apparatus includes a processor for implementing the functions involved in any of the above aspects.
- the communication device further includes a memory for storing necessary program instructions and data.
- the communication device is a chip system, it may be constituted by a chip, or may include a chip and other discrete devices.
- a twelfth aspect provides a chip, the chip including a processor and a communication interface for communicating with modules other than the shown chip, the processor for running a computer program or instructions such that a computer in which the chip is installed
- An apparatus may perform the method of any of the above aspects.
- a communication system includes the NSTR MLD of the above-mentioned aspect, or the sending end MLD, or the receiving end MLD.
- FIG. 1a is a schematic structural diagram of a PPDU provided by an embodiment of the present application.
- FIG. 1b is a schematic structural diagram of another PPDU provided by an embodiment of the present application.
- FIG. 1c is a schematic structural diagram of a transmission opportunity TXOP provided by an embodiment of the present application.
- FIG. 2 is a schematic diagram of a communication scenario of a multi-link device provided by an embodiment of the present application
- FIG. 3 is a schematic diagram of a communication scenario in an embodiment of the present application.
- FIG. 4 is a schematic diagram of another communication scenario in an embodiment of the present application.
- FIG. 5 is a schematic diagram of an inter-frame interval involved in an embodiment of the present application.
- FIG. 6 is a method flowchart of a channel listening method proposed by an embodiment of the present application.
- FIGS. 7-10 are schematic diagrams of an inter-frame interval proposed by an embodiment of the present application.
- FIG. 11 is a method flowchart of a channel listening method proposed by an embodiment of the present application.
- FIGS. 12-13 are schematic diagrams of an inter-frame interval proposed by an embodiment of the present application.
- FIG. 20 is a schematic structural diagram of a NSTR MLD provided in an embodiment of the present application.
- FIG. 21 is a schematic structural diagram of a communication device according to an embodiment of the application.
- the embodiments of the present application provide a method for channel listening and a related device, so that a multi-link device that cannot transmit and receive synchronously can synchronize multi-link communication.
- At least one item(s) below or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s).
- at least one item (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple .
- WLAN Wireless Local Area Network
- BSS Basic Service Set
- AP Access Point
- Non-AP STA Non-AP STA
- BSS Basic Service Set
- AP Access Point
- Non-AP STA Non-AP STA
- Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
- Access point type sites also known as wireless access points or hotspots, etc.
- APs are access points for mobile users to access wired networks. They are mainly deployed in homes, buildings, and campuses, with a typical coverage radius ranging from tens of meters to hundreds of meters. Of course, they can also be deployed outdoors.
- AP is equivalent to a bridge connecting wired network and wireless network. Its main function is to connect various wireless network clients together, and then connect the wireless network to Ethernet.
- the AP may be a terminal device or a network device with a wireless fidelity (Wireless Fidelity, WiFi) chip.
- wireless fidelity Wireless Fidelity, WiFi
- the AP can be a device that supports 802.11ax standards, and further optionally, the AP can be a device that supports multiple WLAN standards such as 802.11be, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
- the AP can also support the next-generation 802.11 protocol, which is not limited here.
- a non-access point station can be a wireless communication chip, a wireless sensor or a wireless communication terminal.
- a wireless communication chip for example: mobile phones that support WiFi communication, tablet computers that support WiFi communication, set-top boxes that support WiFi communication, smart TVs that support WiFi communication, smart wearable devices that support WiFi communication, in-vehicle communication that supports WiFi communication Devices and computers that support WiFi communication.
- the STA may be a terminal device or a network device with a Wi-Fi chip.
- the station can support the 802.11ax standard, and further optionally, the station can support 802.11be, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a and other WLAN standards, and the STA can also support the next-generation 802.11 agreement, there are no restrictions here.
- PPDU Physical protocol data unit
- PPDU includes: traditional short training field (L-STF), traditional long training field (L-LTF), traditional signaling field (legacy-signal field, L-SIG), Repeated legacy signaling field (RL-SIG), high efficient signaling field A (high efficient-signal field A, HE-SIG A), high efficient signaling field B (high efficient-signal field B, HE -SIG B), high efficient-short training field (HE-STF), high efficient-long training field (HE-LTF), data (data).
- the PPDU may further include a data packet extension (packet extension, PE).
- the EHT PPDU may include three parts: a legacy preamble (L-preamble), a high efficiency preamble (HE-preamble) and a physical layer convergence protocol service data unit (PSDU) .
- L-preamble legacy preamble
- HE-preamble high efficiency preamble
- PSDU physical layer convergence protocol service data unit
- the L-preamble part includes the L-STF field, the L-LTF field, and the L-SIG field;
- the HE-preamble part includes the RL-SIG field and the universal field (universal SIG, U-SIG) field, extremely high throughput signaling (EHT-SIG) field, extremely high throughput short training field (EHT-STF) field, extremely high throughput long training field (EHT-LTF) field;
- the PSDU part includes Fields such as the data (data) field, where the U-SIG field occupies 2 OFDM symbols, such as U-SIG SYM1 and U-SIG SYM1 as shown in Figure 1b.
- the Universal Field (U-SIG) field may include a version independent information (version independent info) field and a version dependent information (version dependent info) field, a CRC field, and a tail field.
- the version independent info field may include a 3-bit WiFi version field, a 1-bit downlink/uplink field, at least a 6-bit BSS color field, and at least a 7-bit TXOP field. Further, the version independent info field may also include a bandwidth field.
- the version dependent info field may include a PPDU format field, etc., and may also include one or more of a modulation and coding scheme field, a spatial stream field, a coding field, and the like.
- the CRC field occupies at least 4 bits
- the tail field occupies at least 6 bits of the tail bit field.
- the EHT-SIG field includes the EHT-SIG common field and the EHT-SIG user-specific field, wherein the EHT-SIG common field can be used to carry the resource allocation information allocated to the STA, and the EHT-SIG user-specific field Can be used to carry user information.
- EHT-PPDU is only an example, and other structures may also be present in the standard formulation process or the technology development process, which is not limited in this application.
- TXOP Transmission opportunity
- TXOP is the basic unit of wireless channel access. TXOP consists of initial time and maximum duration TXOP limit.
- interframe space In order to avoid collisions as much as possible, after the device completes sending frames, it must wait for a short period of time before sending the next frame. This period of time is usually called the interframe space (IFS).
- IFS interframe space
- SIFS short interframe space
- FIG. 1c it is a schematic diagram of normal transmission of PPDUs in a TXOP.
- the sending end device starts to send PPDU11 after receiving the SIFS time of the clear to send (CTS) frame, and after the SIFS time interval continues, it receives the Block Acknowledge (BA) frame BA11 from the receiving end device.
- the BA11 It is used to feed back to the sender whether the transmission of PPDU11 is successful. Assuming that the transmission of PPDU11 is successful, the sender device continues to send PPDU12 at the SIFS time after the end of the BA11 frame, and so on.
- the RTS in Figure 1c is a request to send (request to send, RTS).
- RTS/CTS is used to solve the problem of hidden sites to avoid signal conflict between multiple sites.
- the sender Before the sender sends the data frame, the sender first sends the RTS frame to instruct the sender to send the data frame to the specified receiver within the specified duration. After the receiver receives the RTS frame, it replies with the CTS frame to confirm the transmission of the sender.
- Other stations that receive RTS frames or CTS frames do not send radio frames until the specified time period expires.
- TXOP transmission opportunity
- the error recovery includes point coordination function interframe space (PIFS) error recovery and backoff error recovery.
- PIFS error recovery after the idle time of the channel reaches PIFS, the device sends the next PPDU on the channel. Waiting for the channel to be idle for the PIFS time, and then sending the next PPDU, can be called PIFS error recovery.
- Multi-link Multi-link
- ML multi-link
- the core idea of link communication is that WLAN devices that support the next-generation IEEE 802.11 standard, that is, EHT devices, have the ability to transmit and receive on multiple frequency bands, so that they can use a larger bandwidth for transmission, thereby improving throughput.
- Multi-band mainly includes but is not limited to 2.4GHz WiFi band, 5GHz WiFi band and 6GHz WiFi band. Among them, the access and transmission performed on each frequency band is called a link (link), and the access and transmission on multiple frequency bands are called multi-link communication.
- a device that supports multi-link communication is called a multi-link device (Multi-link Device, MLD), and is also called an MLD device.
- MLD multi-link device
- FIG. 2 is a schematic diagram of the multi-link device provided by the embodiment of the application. Schematic diagram of the communication scenario. There are multiple access points (Access Point, AP) or stations (Station, STA) in each MLD device, and the communication between MLDs is multi-link communication. In Figure 1, link 1 and link 2 form a multi-link road.
- AP Access Point
- STA station
- FIG. 3 is a schematic diagram of a communication scenario in an embodiment of the present application.
- MLDs including MLD301 and MLD302
- MLDs have the ability to transmit and receive on multiple frequency bands.
- multi-link devices have higher Transmission efficiency and higher throughput.
- the above-mentioned multiple frequency bands include, but are not limited to: a 2.4GHz frequency band, a 5GHz frequency band, and a 6GHz frequency band.
- the spatial path that MLD performs data transmission on a frequency band can be called a link. That is, MLD supports multi-link communication.
- each link supported by the MLD corresponds to one frequency band.
- the MLD may also be referred to as a multi-band device (multi-band device), and the two may be replaced with each other, which is not specifically limited in this embodiment of the application.
- the MLD includes at least two affiliated STAs (affiliated STAs).
- the affiliated station may be an access point (Access Point Station, AP STA) or a non-access point station (non-Access Point Station, non-AP STA).
- AP STA Access Point Station
- non-AP STA non-access point station
- this application refers to a multi-link device whose subordinate site is an AP as a multi-link AP or multi-link AP device or AP multi-link device (AP multi-link device, AP MLD), and the subordinate site is A multi-link device of a non-AP STA is called a multi-link STA or a multi-link STA device or a STA multi-link device (STA MLD) or a non-AP multi-link device (non-AP MLD) ).
- STA MLD STA multi-link device
- non-AP MLD non-AP multi-link device
- a non-AP STA can implement the functions of an AP, or in other words, a non-AP STA can be operated as an AP.
- a non-AP STA that can implement an AP function or an MLD composed of a non-AP MLD that can be operated as an AP can be called a soft AP MLD (soft AP MLD).
- AP MLD can be divided into STR AP MLD and non-STR AP MLD.
- STR AP MLD has STR capability, while non-STR AP MLD does not have STR capability.
- non-AP MLD can be divided into STR non-AP MLD and non-STR non-AP MLD, STR non-AP MLD has STR capability, non-STR non-AP MLD does not have STR capability.
- the non-STR AP MLD may include the above-mentioned soft AP MLD.
- non-STR AP MLDs are not limited to soft AP MLDs.
- Each STA in the MLD can establish a link for communication.
- the communication between site A1 and site B1 is through link 1
- the communication between site A2 and site B2 is link 2
- the link N is used for communication between the site AN and the site BN.
- the multiple links between the MLD 301 and the MLD 302 include a first link and a second link as an example for description.
- STR Simultaneous transmitting and receiving
- NSTR Non-Simultaneous transmitting and receiving
- an MLD can work on two or more links, and its STR/NSTR capability is for each link pair, so it may occur between different link pairs of the same MLD.
- the STR/NSTR capabilities are different.
- some link pairs are STRs, and the other link pairs are NSTRs.
- NSTR MLD refers to the link pair in which the MLD works, and at least one link pair has the capability of NSTR.
- STR MLD means that all link pairs that the MLD works are STR.
- the NSTR MLD transmits or receives data on the first link and the second link, the first link and the second link are a pair of NSTR links, the first link and the second link are a pair of NSTR links.
- a road is also called an NSTR link pair.
- NSTR MLDs due to limited capabilities, when NSTR MLDs transmit signals on one link, they may not be able to receive signals on another link. That is, when the NSTR MLD sends a signal on one link, if it needs to receive data on another link, the data may not be received, resulting in packet loss.
- the NSTR MLD is to send PPDUs on two links at the same time without interfering with each other, the start and end times of the two PPDUs on the two links need to be aligned.
- the difference between the end times of two PPDUs is less than or equal to 8 microseconds, it is considered that the end times of the two PPDUs are aligned.
- the end times of the two PPDUs need to be aligned.
- the maximum (allowable) error of alignment is 8 microseconds.
- the 8 microseconds Also known as alignment accuracy. Based on the alignment accuracy, after the NSTR MLD sends two PPDUs carrying data simultaneously on the NSTR link (taking the NSTR link as the first link and the second link as an example), the MLD that receives the PPDU will be sent on the NSTR link.
- the two channels (the first link and the second link) reply to the acknowledgment block (Block ACK, BA) at the same time, and the maximum error of the end time of the PPDU carrying the two BAs is also 8 microseconds.
- the transmission error in the embodiment of the present application may include the following two situations:
- a reception error occurs in the BA, that is, the BA triggers the physical layer reception start indication (PHY-RXSTART.indication), and the MAC layer frame check sequence (Frame Check Sequence, FCS) check of the BA frame fails.
- PHY-RXSTART.indication physical layer reception start indication
- FCS MAC layer frame check sequence
- the STA sending the PPDU is not triggered by the primitive physical layer reception start indication (PHY-RXSTART.indication).
- the transmission error includes a transmission error and a reception error.
- a transmission error may also be referred to as a transmission failure (failure), where the transmission failure includes a sending failure and a receiving failure, which is not limited here.
- both the reception error of the BA and the transmission error of the PPDU may be regarded as transmission errors, and may also be regarded as erroneous frames or frames with transmission failure, which are not limited in this application.
- both the reception error of the BA and the transmission error of the PPDU are described as transmission failure frames.
- the channel listening process in the case of the BA receiving error is taken as an example for description.
- the STA performs channel sensing in the PIFS after the BA ends.
- the STA (taking STA2 as an example) performs channel listening (for example, listening to the channel of STA1) within the PIFS time length after the BA frame ends, so as to determine the busy and idle state of the channel. If the STA2 channel listening determines that the channel is idle, it will continue to send the next PPDU on this link; if the STA2 channel listening determines that the channel is busy, it will stop sending PPDUs on this link.
- the STA After receiving the correct BA, the STA also waits for the PIFS before sending the next PPDU. Therefore, the end times of the two BAs may differ by a maximum of 8 microseconds. STA1 waits for PIFS to send the next PPDU after receiving the BA correctly. Because of the influence of STA1 sending the next PPDU, the channel detection result of STA2 is busy.
- the prior art solution proposes that: after receiving a correct BA, the STA waits for PIFS+ ⁇ before sending the next PPDU, and the time for this ⁇ is 0-4 microseconds (us).
- the next PPDU sent by STA1 only interferes with the last 4us of the PIFS time of STA2 at most.
- the last 4us is generally the transition from the receiving state to the sending state, so no channel listening will be performed within this time (4us), so the result of the channel listening will not be affected.
- an embodiment of the present application provides a method for channel listening.
- the NSTR MLD including the first station STA and the second STA as an example
- the first STA transmits the first frame on the first link
- the second STA transmits the second frame on the second link.
- the end time of the first frame is later than the end time of the second frame.
- other sites may also be included in the NSTR MLD, which is not limited here.
- the first link and the second link are for illustration only, and do not indicate the specific number of links.
- the first link and the second link represent any two links in the multi-link, and the solution of the present application can be extended to the case of more than two links.
- the solutions proposed in the embodiments of the present application include:
- the first frame and the second frame are response frames, such as acknowledgement blocks (BA).
- BA acknowledgement blocks
- the first STA is receiving the first frame (response frame)
- the second STA is receiving the second frame (response frame).
- the first frame and the second frame are PPDUs.
- the first STA sends the first frame (PPDU)
- the second STA sends the second frame (PPDU).
- BA may be understood as a response frame.
- the response frame may also include an acknowledgement (ACK).
- BA in this application can also be replaced by ACK. That is to say, the BA in this application only represents a response frame, and the response frame does not necessarily have to be a BA, but can also be an ACK.
- the response frame may also be other types of frames, which are not limited here.
- FIG. 6 is a method flowchart of a channel listening method provided by an embodiment of the present application.
- a channel interception method proposed by an embodiment of the present application includes:
- the first STA in the NSTR MLD transmits the first frame on the first link
- the second STA in the NSTR MLD transmits the second frame on the second link.
- the first STA in the NSTR MLD receives the first frame on the first link, and the first frame is a response frame.
- the second STA in the NSTR MLD receives the second frame on the second link, and the second frame is a response frame.
- the end time of the first frame is later than the end time of the second frame.
- the following description takes the response frame as BA as an example.
- FIG. 7 is a schematic diagram of an inter-frame interval proposed by an embodiment of the present application.
- the first STA may be understood as STA1
- the second STA may be understood as STA2
- the first frame may be understood as BA11
- the second frame may be understood as BA21.
- the NSTR MLD determines the frame that fails to transmit.
- the NSTR MLD determines whether the first frame and the second frame are frames that fail to transmit, that is, determines whether the first frame and the second frame fail to transmit.
- the NSTR MLD determines the frame that fails to transmit as follows:
- NSTR MLD STA1
- the first frame triggers the primitive physical layer to receive the indication PHY-RXSTART.indication, and the MAC layer frame detection sequence FCS check of the first frame fails, then NSTR MLD determines The first frame is the frame that failed to transmit.
- NSTR MLD STA2
- the second frame triggers the primitive physical layer to receive the indication PHY-RXSTART.indication, and the MAC layer frame detection sequence FCS check of the second frame fails, then NSTR MLD determines The second frame is a transmission failure frame.
- the NSTR MLD When the NSTR MLD (STA1) receives the first frame, the first frame triggers the primitive PHY-RXSTART.indication and the MAC layer FCS check of the first frame fails, and when the NSTR MLD (STA2) receives the second frame, the first frame The second frame triggers the primitive PHY-RXSTART.indication and the MAC layer FCS check of the second frame fails, then the NSTR MLD determines that the first frame and the second frame are both failed transmission frames.
- the NSTR MLD performs channel monitoring.
- the first STA performs channel listening at the first inter-frame interval after the end of the first frame.
- the second STA performs channel listening at the second inter-frame interval.
- the first frame is a frame that fails to transmit.
- the first STA performs channel listening at the first inter-frame interval after the end of the first frame.
- the time length of the first inter-frame interval is the difference between PIFS and the first time, and the value range of the first time is 0-4 microseconds (if the first time is represented by t, the value range of t is [0,4]). In other words, that is, the value range of the time length of the inter-frame interval of the first frame is [PIFS-4, PIFS].
- the value range of the first time is 0-8 microseconds.
- the next frame (eg, PPDU) sent by the first STA can avoid causing interference to the second STA, and the difficulty of listening may not be increased.
- the next frame (eg PPDU) sent by the first STA can be prevented from causing interference to the second STA. And, it can be guaranteed that the next frame (eg PPDU) sent by the first STA is aligned with the next frame (eg PPDU) sent by the second STA. In addition, the difficulty of listening may not be increased.
- the value range of the first time may also be 0-9 microseconds, or 0-12 microseconds.
- the first time in this embodiment of the present application can take any value from 0-8 microseconds, and the arbitrary value Can be an integer, such as: 0, 1, 2, 3, 4, 5, 6, 7, or 8 microseconds; the arbitrary value can also be a decimal, such as: 0.5, 1.5, 1.8, or 3.4 microseconds, etc.
- the second time, the third time, the fourth time, the fifth time, the sixth time, the seventh time or the eighth time involved in the embodiments of the present application are similar to the relevant definitions of the aforementioned first time, and will not be repeated hereafter .
- the time length of the first inter-frame interval is a short frame interval SIFS.
- the second STA performs channel listening at a second inter-frame interval after the end of the second frame.
- the second inter-frame interval is the sum of the short frame interval SIFS and the second time, and the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds .
- FIG. 8 is a schematic diagram of an inter-frame interval in an embodiment of the present application.
- BA11 is the frame that fails to transmit.
- the following is an example to illustrate the specific implementation of channel listening by NSTR MLD:
- the time of the first inter-frame interval is the difference between the PIFS and the first time.
- the second inter-frame interval of STA2 after BA21 ends may be PIFS.
- STA2 may perform channel sensing within the second inter-frame interval.
- the time of the first inter-frame interval is a short frame interval SIFS.
- the second inter-frame interval of STA2 after BA21 ends may be the sum of the SIFS and the second time.
- STA2 may perform channel sensing within the second inter-frame interval.
- the second frame is a frame that fails to transmit.
- the first STA performs channel listening at the first inter-frame interval after the end of the first frame, so that the next PPDU can be sent only when the channel state is idle, which can reduce potential collisions .
- the time of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time is 0-4 microseconds, or the value range of the first time is 0 -8 microseconds, or, the value range of the first time is 0-9 microseconds, or, the value range of the first time is 0-12 microseconds.
- FIG. 9 is a schematic diagram of an inter-frame interval in an embodiment of the present application, wherein, when the value range of the first time is 0-4 microseconds, STA1 can be prevented from sending the next PPDU ( PPDU12) interferes with STA2.
- the value range of the first time is 0-8 microseconds, it can be avoided that STA1 sends the next PPDU (PPDU12) to cause interference to STA2. Moreover, it can be ensured that the PPDU12 sent by STA1 is aligned with the PPDU22 sent by STA2.
- the value range of the first time is 0-9 microseconds, it can prevent STA1 from causing interference to STA2 by sending the next PPDU (PPDU12). Moreover, it can be ensured that the PPDU12 sent by STA1 is aligned with the PPDU22 sent by STA2. At the same time, the requirement that the current inter-frame interval is greater than or equal to the SIFS is satisfied.
- the 4us before sending the next PPDU (PPDU12) is the transition from the receiving state to the sending state, so the 4us is not used for channel monitoring.
- PPDU12 the 4us before sending the next PPDU
- BA21 8us ahead of BA11, the inter-frame interval after BA11 is PIFS-12 (microseconds) and will not affect the channel sensing of STA1.
- the first STA since the transmission of the first frame is correct, the first STA does not perform channel listening in the first inter-frame interval after the end of the first frame. If no channel listening is required in the first inter-frame interval, the next PPDU is sent directly after the end of the first inter-frame interval.
- the second STA performs channel listening at a second inter-frame interval after the end of the second frame, and the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time,
- the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- BA21 is a frame that fails to transmit.
- the following is an example to illustrate the specific implementation of channel listening by NSTR MLD:
- STA2 performs channel sensing at the second inter-frame interval after BA21 ends.
- the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time.
- the first inter-frame interval of STA1 after BA11 ends is SIFS.
- STA1 performs channel listening at the first inter-frame interval.
- the first inter-frame interval of STA1 after BA11 ends is the difference between PIFS and the first time.
- STA2 performs channel listening at the second inter-frame interval after BA21 ends, and the time of the second inter-frame interval is PIFS.
- STA1 may directly send the next PPDU without performing channel listening in the first inter-frame interval, or STA1 may perform channel listening in the first inter-frame interval, and only transmit the next PPDU if the channel is idle.
- Both the first frame and the second frame are transmission failure frames.
- the first STA performs channel listening at the first inter-frame interval after the end of the first frame, and the time length of the first inter-frame interval is the difference between the PIFS and the first time, and the first inter-frame interval is the difference between the PIFS and the first time.
- the value range of a time is 0-4 microseconds, or, the value range of the first time is 0-8 microseconds, or, the value range of the first time is 0-9 microseconds, or, the first time
- the value range is 0-12 microseconds.
- the second STA performs channel listening at a second inter-frame interval after the end of the second frame.
- the time of the second inter-frame interval is the sum of the short frame spacing SIFS and the second time, and the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- the specific selection of the first time and the second time can be determined by the NSTR MLD measuring the difference between the end time of the first frame and the end time of the second frame, or it can be pre-configured in the NSTR MLD. There are no restrictions. For example, if the difference between the end time of the first frame and the end time of the second frame measured by NSTR MLD is 5 microseconds, it can be determined that the value range of the first time is 5 microseconds or the value range of the second time is 5 microseconds. microseconds.
- the second STA may perform channel listening in the PIFS. After the end of the second frame, the second STA may also perform channel listening in inter-frame intervals of other lengths, which is not limited here.
- FIG. 10 is a schematic diagram of an inter-frame interval in an embodiment of the present application, where BA11 and BA21 are both frames that fail to transmit.
- BA11 and BA21 are both frames that fail to transmit.
- the following is an example to illustrate the specific implementation of channel listening by NSTR MLD:
- STA1 performs channel listening at the first inter-frame interval after BA11 ends, and the time of the first inter-frame interval is the difference between the PIFS and the first time.
- STA2 performs channel listening at the second inter-frame interval after BA21 ends, and the second inter-frame interval is PIFS.
- STA2 performs channel sensing at the second inter-frame interval after BA21 ends.
- the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time.
- STA1 performs channel listening at the first inter-frame interval after BA11 ends, and the first inter-frame interval is SIFS.
- STA1 sends the next PPDU on the first link when the first inter-frame interval ends. (ie PPDU12).
- the next PPDU (ie, PPDU12 ) is directly sent after the first inter-frame interval ends.
- the NSTR MLD after receiving an erroneous response frame (BA or ACK), the NSTR MLD can adjust the channel listening time. In this way, the sending action of other links is avoided and the result of channel listening is affected. At the same time, the inter-frame interval is made to meet the communication requirements.
- BA or ACK erroneous response frame
- FIG. 11 is a method flowchart of another channel listening method provided by an embodiment of the present application.
- Another channel listening method proposed by the embodiment of the present application includes:
- the first STA in the NSTR MLD transmits the first frame on the first link
- the second STA in the NSTR MLD transmits the second frame on the second link.
- the first STA in the NSTR MLD sends the first frame on the first link, where the first frame is a PPDU.
- the second STA in the NSTR MLD sends a second frame on the second link, the second frame being a PPDU.
- the end time of the first frame is later than the end time of the second frame.
- FIG. 12 is a schematic diagram of an inter-frame interval according to an embodiment of the present application.
- the first frame may be indicated as PPDU12
- the second frame may be indicated as PPDU22.
- the NSTR MLD determines the frame that fails to transmit.
- the NSTR MLD determines whether the first frame and the second frame are transmission failure frames.
- NSTR MLD determines that the frame of transmission failure is as follows:
- NSTR MLD (STA1) sends the first frame, within a specific time of the end of the first frame transmission (end of transmission), STA1 is not triggered by the primitive physical layer to receive the indication PHY-RXSTART.indication, then NSTR MLD determines the first A frame is a frame that fails to transmit.
- NSTR MLD (STA2) sends the second frame, within a specific time of the end of the second frame transmission (end of transmission), STA2 does not trigger the primitive physical layer to receive the indication PHY-RXSTART.indication, then NSTR MLD determines the first The second frame is the frame that fails to transmit.
- step 1103 is entered.
- the NSTR MLD performs channel monitoring.
- the first STA performs channel listening at a third inter-frame interval after the end of the first frame, where the third inter-frame interval is the difference between PIFS and a third time;
- the value range is 0-4 microseconds, or, the value range of the third time is 0-8 microseconds.
- the time length of the third inter-frame interval is a short frame interval SIFS.
- the second STA performs channel listening at a fourth inter-frame interval after the end of the second frame, where the fourth inter-frame interval is the sum of the SIFS and the fourth time;
- the value range is 0-4 microseconds, or the value range of the fourth time is 0-8 microseconds.
- the second STA performs channel listening within the fifth inter-frame interval.
- the sum of the time length of the fifth inter-frame interval and the fifth time is less than or equal to the time length of the PIFS.
- the time length of the fifth time is 0-8 microseconds.
- FIG. 13 is a schematic diagram of an inter-frame interval proposed by an embodiment of the present application. After the end of PPDU21, STA2 performs channel sensing within the fifth inter-frame interval. The details are as follows: STA2 first waits for a fifth time (0-8 microseconds), and after the fifth time expires, STA2 performs channel listening in the fifth inter-frame interval.
- STA1 performs channel listening at the third inter-frame interval after the end of PPDU11.
- the third inter-frame interval is as described above in relation to FIG. 12 , which is not repeated here.
- STA1 performs channel sensing at the SIFS after the end of PPDU11.
- FIG. 12 is a schematic diagram of an inter-frame interval in an embodiment of the present application.
- the following is an example to illustrate the specific implementation of channel listening by NSTR MLD:
- STA1 performs channel listening at the third inter-frame interval after the PPDU11 ends, and the time of the third inter-frame interval is the difference between the PIFS and the third time.
- STA2 performs channel listening at the fourth inter-frame interval after the PPDU21 ends, and the fourth inter-frame interval is PIFS.
- STA1 performs channel listening at the third inter-frame interval after the PPDU11 ends, and the time of the third inter-frame interval is the difference between the PIFS and the third time.
- STA2 performs channel listening at the fifth inter-frame interval, and the sum of the time length of the fifth inter-frame interval and the fifth time is less than or equal to the time length of the PIFS.
- the value range of the fifth time is 0-8 microseconds.
- STA1 performs channel listening at the third inter-frame interval after the PPDU11 ends, and the time of the third inter-frame interval is the short frame interval SIFS.
- STA2 performs channel listening at the fourth inter-frame interval after the PPDU21 ends, and the fourth inter-frame interval is the sum of the SIFS and the fourth time.
- STA1 performs channel listening at the third inter-frame interval after the PPDU11 ends, and the time of the third inter-frame interval is the short frame interval SIFS.
- STA2 performs channel listening at the fifth inter-frame interval, and the sum of the time length of the fifth inter-frame interval and the fifth time is less than or equal to the sum of the SIFS and the fourth time. length of time.
- the value range of the fifth time is 0-8 microseconds.
- STA1 sends the next PPDU on the first link when the third inter-frame interval ends (ie PPDU12).
- the next PPDU (ie PPDU22) is sent on the second link.
- the specific selection of the above-mentioned third time, fourth time and fifth time can be determined by NSTR MLD measuring the difference between the end time of the first frame and the end time of the second frame, or it can be pre-configured in NSTR MLD, here No restrictions. For example, if the difference between the end time of the first frame and the end time of the second frame measured by NSTR MLD is 5 microseconds, the value range of the third time is determined to be 5 microseconds.
- the channel listening time can be adjusted, so as to avoid the influence of the sending action of other links on the channel listening result.
- the inter-frame interval is made to meet the communication requirements.
- FIG. 14 is a method flowchart of a channel listening method provided by an embodiment of the present application.
- a channel interception method proposed by an embodiment of the present application includes:
- the first STA in the NSTR MLD transmits the first frame on the first link
- the second STA in the NSTR MLD transmits the second frame on the second link.
- the first STA in the NSTR MLD sends the first frame on the first link, where the first frame is a PPDU.
- the second STA in the NSTR MLD sends a second frame on the second link, the second frame being a PPDU.
- the end time of the first frame is later than the end time of the second frame.
- FIG. 15 is a schematic diagram of an inter-frame interval proposed by an embodiment of the present application.
- the first frame may be indicated as PPDU12
- the second frame may be indicated as PPDU22.
- the NSTR MLD determines the frame that fails to transmit.
- the manner in which the NSTR MLD determines whether the first frame and the second frame are frames with transmission failure is the same as that in the embodiment shown in FIG. 11 , and details are not repeated here.
- step 1403 is entered.
- the second STA After the second frame ends, the second STA performs channel sensing.
- the time of the sixth inter-frame interval is The sum of the confirmation timeout AckTimeout and the sixth time.
- the value range of the sixth time is 0-4 microseconds or the value range of the sixth time is 0-8 microseconds.
- the sixth inter-frame space is also referred to as a reserved inter-frame space.
- FIG. 16 is a schematic diagram of an inter-frame interval proposed by an embodiment of the present application.
- STA2 After the second frame (PPDU21) ends, STA2 performs channel listening at the seventh inter-frame interval after the seventh time, and the sum of the seventh time and the seventh inter-frame interval is equal to the time length of the sixth inter-frame interval.
- the value range of the seventh time is 0-8 microseconds.
- the channel listening time can be adjusted, thereby avoiding the sending action of other links and affecting the channel listening result.
- the inter-frame interval is made to meet the communication requirements.
- the MLD 301 can be used as the sending end MLD, and the MLD 302 can be used as the receiving end MLD.
- MU-RTS Multiple User-Request To Send
- CTS Clear to Send
- the AP and multiple STAs can perform channel protection at the same time.
- the basic process is that the AP sends a MU-RTS frame after contending for a channel, where the MU-RTS frame carries the Association Identifier (AID) of one or more target STAs.
- AID Association Identifier
- the target STA When the target STA receives the MU-RTS frame and confirms that it belongs to the target STA, it performs channel listening (also known as energy detection) within the SIFS time after the MU-RTS frame. If the channel listening result is idle, it will reply CTS frame, if the channel listening result is busy, the CTS frame will not be replied. It should be noted that when the AP only sends the MU-RTS frame to one STA, if the STA determines that it is the target STA after detecting the MU-RTS frame, the STA sends the CTS to the AP. That is, only one STA replies to the CTS.
- channel listening also known as energy detection
- the sender MLD can be an AP MLD.
- the sender MLD includes AP1 and AP2, and it can also be a STA MLD;
- the receiver MLD can be a STA MLD.
- the receiver MLD includes STA1 and STA2. , or AP MLD.
- the MLD at the sending end can be an STR MLD, the MLD at the sending end can also be an NSTR MLD; the MLD at the receiving end is an NSTR MLD.
- AP1 in the transmitter MLD sends MU-RTS1 to the receiver MLD through the first link (link 1)
- AP2 in the transmitter MLD sends the MU-RTS1 to the receiver MLD through the second link (link 2).
- the start time of CTS1 is 8 microseconds apart from the start time of CTS2, and the start time of CTS1 is earlier than the start time of CTS2. start time.
- the last 4us is generally the transition from the receiving state to the sending state, so the channel listening will not actually be performed during this time (4us), so the channel state of these 4 microseconds will not affect the The result of channel listening, this 4 microseconds is also called the Receive to Transmit Transition Time (RX/TX time). Therefore, when the difference between the end time of MU-RTS1 and the end time of MU-RTS2 exceeds 4 microseconds, the end time of MU-RTS1 is earlier than that of MU-RTS2 as an example. Then, the CTS1 replied by the receiving end MLD on the first link (link 1) will affect the channel detection result of STA2 in the receiving end MLD. The cross-link interference brought by the CTS1 makes the result of the channel sensing performed by the STA2 as busy. Therefore, STA2 cannot send CTS2.
- RX/TX time Receive to Transmit Transition Time
- the embodiment of the present application proposes two solutions to solve the above problems.
- (2) The time interval for channel listening before the receiver MLD sends the CTS frame is agreed upon. The following descriptions are made respectively.
- An embodiment of the present application proposes a method for sending an MU-RTS frame.
- the method is applied to the MLD at the sending end, and the method includes:
- the sending end MLD includes a first access point AP and a second AP, wherein the first AP transmits the first multi-user request to send frame MU-RTS on the first link, and the second AP transmits the second Multi-user request to send frame MU-RTS;
- the difference between the end time of the first MU-RTS and the end time of the second MU-RTS is at most 4 microseconds.
- the first AP is AP1
- the second AP is AP2
- the first link is link 1
- the second link is link
- the first MU-RTS is MU-RTS1
- the second MU-RTS is MU-RTS2.
- the end time of MU-RTS1 and the end time of MU-RTS2 differ by a maximum of 4 microseconds
- the maximum difference between the start time of CTS1 and CTS2 is also 4 microseconds. Therefore, the interference of the CTS frame (CTS1) sent in advance to the other link (link 2) will not affect the channel sensing result on the other link.
- STA2 in the receiving end MLD can send CTS2 normally.
- the interference between the reply frames (CTS) of the MU-RTS is avoided, and the normal transmission of the CTS is ensured.
- An embodiment of the present application proposes a method for sending a CTS frame.
- the method is applied to a receiving end MLD, and the method includes:
- the receiving end MLD includes a first access point STA, wherein the first STA receives the first MU-RTS on the first link;
- the first STA sends the first clear-to-send frame CTS on the first link.
- the start time of the first CTS is different from the end time of the first MU-RTS by an eighth inter-frame interval, and the time length of the eighth inter-frame interval is greater than or Equal to the length of time of SIFS.
- the time of the eighth inter-frame interval is the sum of the eighth time and the SIFS, and the value range of the eighth time is 0-4 microseconds, or the value range of the eighth time is 0- 8 microseconds.
- the first STA performs channel sensing within the eighth inter-frame interval.
- the receiving end MLD further includes a second access point STA, where the second STA receives the second MU-RTS on the second link, and the end time of the second MU-RTS is later than the second MU-RTS.
- the second STA receives the second MU-RTS on the second link, and the end time of the second MU-RTS is later than the second MU-RTS.
- the second STA sends a second clear-to-send frame CTS on the second link, and the start time of the second CTS is SIFS different from the end time of the second MU-RTS.
- the first STA is STA1
- the second STA is STA2
- the first link is link 1
- the second link is link
- the first CTS is CTS1
- the second CTS is CTS2.
- the two STAs at the receiving end of the MLD can always reduce the transmission time alignment error of the two CTS frames to 0 microseconds.
- the CTS (CTS1) will not affect the channel listening before the later CTS (CTS2) is sent, and the alignment error of the CTS frame can be reduced as much as possible, so that the subsequent PPDUs can be better aligned.
- the time interval before the receiving end MLD sends the CTS frame is agreed, so as to avoid interference between the CTS frames on different links and ensure the normal sending of the CTS.
- an embodiment of the present application further provides a communication device, where the communication device is used to implement the above-mentioned various methods.
- the communication device may be the NSTR MLD in the foregoing method embodiments, or a device including the foregoing NSTR MLD, or a device included in the foregoing NSTR MLD, such as a system chip.
- the communication device may be the sending end MLD in the foregoing method embodiments, or a device including the foregoing sending end MLD, or a device included in the foregoing sending end MLD, such as a system chip.
- the communication device may be the receiving end MLD in the foregoing method embodiments, or a device including the foregoing receiving end MLD, or a device included in the foregoing receiving end MLD, such as a system chip.
- the communication apparatus includes corresponding hardware structures and/or software modules for executing each function.
- the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
- the communication device may be divided into functional modules according to the above method embodiments.
- each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
- the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
- FIG. 20 shows a schematic diagram of the structure of an NSTR MLD.
- the NSTR MLD 2000 includes a listening module 2002 and a processing module 2001.
- the listening module 2002 which can also be called a transceiver unit, is used to implement sending and/or receiving functions, for example, it can be a transceiver circuit, a transceiver, a transceiver or a communication interface.
- a processing module 2001 configured to determine that at least one transmission of the first frame and the second frame fails
- the listening module 2002 is configured to perform channel listening at the first inter-frame interval after the end of the first frame, wherein the time length of the first inter-frame interval is less than or equal to the point coordination function inter-frame interval PIFS. length of time,
- the listening module 2002 is used for the second STA to perform channel listening at a second inter-frame interval after the second frame ends, wherein the time length of the second inter-frame interval is greater than or equal to a short time
- the time length of inter-frame SIFS is less than or equal to the time length of PIFS.
- the time of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time is 0-4 microseconds.
- the time of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time is 0-4 microseconds, or the value range of the first time is 0-8 microseconds, or the value range of the first time is 0-9 microseconds seconds, or the value range of the first time is 0-12 microseconds.
- the time of the first inter-frame interval is the difference between the PIFS and the first time
- the value range of the first time is 0-4 microseconds.
- the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time;
- the value range of the second time is 0-4 microseconds.
- the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time;
- the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- the time of the second inter-frame interval is the sum of the short frame interval SIFS and the second time
- the value range of the second time is 0-4 microseconds, or the value range of the second time is 0-8 microseconds.
- a processing module 2001 configured to determine that the transmission of the first physical layer protocol data unit PPDU on the first link fails
- the listening module 2002 is configured to perform channel listening at the first inter-frame interval after the first frame ends, wherein the time length of the first inter-frame interval is less than or equal to the time length of the point coordination function inter-frame interval PIFS,
- channel listening is performed at the second inter-frame interval, wherein the time length of the second inter-frame interval is greater than or equal to the time length of the short frame spacing SIFS and less than or equal to the time length of the PIFS.
- a processing module 2001 configured to determine that the transmission of the first frame and the second frame fails
- the listening module 2002 is used to perform channel listening at the third inter-frame interval after the first frame ends, and the third inter-frame interval is less than or equal to the time length of the PIFS;
- the listening module 2002 is further configured to perform channel listening at a fourth inter-frame interval after the end of the second frame, where the fourth inter-frame interval is less than or equal to the time length of the PIFS.
- the time of the third inter-frame interval is the difference between the PIFS and the third time
- the value range of the third time is 0-4 microseconds, or the value range of the third time is 0-8 microseconds, or the value range of the third time is 0-9 microseconds Second.
- the time of the fourth inter-frame interval is the sum of the short frame interval SIFS and the fourth time;
- the value range of the fourth time is 0-4 microseconds, or the value range of the fourth time is 0-8 microseconds.
- the listening module 2002 is further configured to perform channel listening at a fifth inter-frame interval after a fifth time elapses after the second frame ends, wherein the time of the fifth inter-frame interval The sum of the length and the fifth time is less than or equal to the time length of the PIFS.
- the value range of the fifth time is 0-8 microseconds.
- a processing module 2001 configured to determine that the transmission of the first frame and the second frame fails
- the listening module 2002 is configured to perform channel listening at a sixth inter-frame interval after the end of the second frame, where the time of the sixth inter-frame interval is the sum of the confirmation timeout AckTimeout and the sixth time.
- the value range of the sixth time is 0-4 microseconds.
- the listening module 2002 is further configured to perform channel listening at a seventh inter-frame interval after a seventh time elapses after the second frame ends, and the seventh time and the seventh frame The sum of the inter-frame intervals is equal to the time length of the sixth inter-frame interval.
- the value range of the seventh time is 0-8 microseconds.
- the NSTR MLD2000 is presented in the form of dividing each functional module in an integrated manner.
- Module herein may refer to a specific ASIC, circuit, processor and memory executing one or more software or firmware programs, integrated logic circuit, and/or other device that may provide the functions described above.
- the NSTR MLD2000 provided in this embodiment can perform the above-mentioned communication method, the technical effect that can be obtained may refer to the above-mentioned method embodiment, which will not be repeated here.
- FIG. 21 is a schematic diagram of a hardware structure of a communication device 210 provided by an embodiment of the present application.
- the communication device 210 includes at least one processor 2101 , a communication line 2102 , a memory 2103 and at least one communication interface 2104 .
- the processor 2101 and the processor 2108 are mainly used for processing communication protocols and communication data, as well as controlling the entire communication device, executing software programs, and processing data of the software programs.
- the memory 2103 is mainly used for storing software programs and data.
- the communication device may further include a control circuit and an antenna (not shown in the figure), and the control circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
- Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
- the output device 2105 and the input device 2106 such as a touch screen, a display screen, a keyboard, etc., are mainly used for receiving data input by the user and outputting data to the user.
- the processor 2101 and the processor 2108 can read the software program in the memory 2103, interpret and execute the instructions of the software program, and process the data of the software program.
- the processor 2101 and the processor 2108 perform baseband processing on the data to be sent, and then output the baseband signal to the radio frequency circuit. Send out.
- the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 2101 and the processor 2108, and the processor 2101 and the processor 2108 convert the baseband signal to the baseband signal. Convert to data and process that data.
- the above-mentioned radio frequency circuit and antenna may be provided independently of the processor for baseband processing.
- the radio frequency circuit and antenna may be arranged remotely from the communication device.
- the above-mentioned functions of the NSTR MLD can be implemented by the communication device 210 .
- the processor 2101 in FIG. 21 can cause the communication device 210 to execute the methods in the above method embodiments by invoking the computer execution instructions stored in the memory 2103.
- the steps/implementation process in FIG. 6 or FIG. 11 or FIG. 14 may be implemented by the processor 2101 in FIG. 21 calling the computer-executed instructions stored in the memory 2103 .
- the processing-related functions/implementation procedures in FIG. 6 or FIG. 11 or FIG. 14 may be implemented by the processor 2101 in FIG. 21 calling the computer-executed instructions stored in the memory 2103, and the The functions/implementation processes related to transceiving can be implemented through the communication interface 2104 in FIG. 21 .
- the processor 2101 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors for controlling the execution of the programs of the present application. integrated circuit.
- CPU central processing unit
- ASIC application-specific integrated circuit
- Communication line 2102 may include a path to communicate information between the above-described components.
- Communication interface 2104 using any transceiver-like device, for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
- RAN radio access network
- WLAN wireless local area networks
- Memory 2103 may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or other types of information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, CD-ROM storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being executed by a computer Access any other medium without limitation.
- the memory may exist independently and be connected to the processor through communication line 2102. The memory can also be integrated with the processor.
- the memory 2103 is used for storing computer-executed instructions for executing the solution of the present application, and the execution is controlled by the processor 2101 .
- the processor 2101 is configured to execute the computer-executed instructions stored in the memory 2103, thereby implementing the link error recovery method provided by the following embodiments of the present application.
- the computer-executed instructions in the embodiment of the present application may also be referred to as application code, which is not specifically limited in the embodiment of the present application.
- the processor 2101 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 21 .
- the communication device 210 may include multiple processors, such as the processor 2101 and the processor 2108 in FIG. 21 .
- processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
- a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).
- the communication device 210 may further include an output device 2105 and an input device 2106 .
- the output device 2105 is in communication with the processor 2101 and can display information in a variety of ways.
- the output device 2105 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) and the like.
- Input device 2106 is in communication with processor 2101 and can receive user input in a variety of ways.
- the input device 2106 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.
- the above-mentioned communication device 210 may be a general-purpose device or a dedicated device.
- the communication device 210 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a similar structure in FIG. 21 . equipment.
- PDA personal digital assistant
- This embodiment of the present application does not limit the type of the communication device 210 .
- an embodiment of the present application further provides a communication apparatus (for example, the communication apparatus may be a chip or a chip system), where the communication apparatus includes a processor for implementing the method in any of the foregoing method embodiments.
- the communication device further includes a memory.
- the memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication apparatus to execute the method in any of the above method embodiments.
- the memory may also not be in the communication device.
- the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.
- any of the above communication devices may be one or more integrated circuits configured to implement the above methods, eg, one or more application specific integrated circuits (ASICs) ), or, one or more microprocessors (digital singnal processors, DSP), or, or, one or more field programmable gate arrays (FPGA), or a combination of at least two of these integrated circuit forms .
- ASICs application specific integrated circuits
- DSP digital singnal processors
- FPGA field programmable gate arrays
- a module in a communication device can be implemented in the form of a processing element scheduler
- the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processors that can invoke programs.
- these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).
- SOC system-on-a-chip
- An embodiment of the present application further provides a chip system, including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the chip executes any one of the implementations shown in the foregoing method embodiments. Way.
- Embodiments of the present application further provide a chip system, including a processor, where the processor is configured to call and run a computer program, so that the chip executes any one of the implementations shown in the foregoing method embodiments.
- the device embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be A physical unit, which can be located in one place or distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
- the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.
- the computer program product includes one or more computer instructions.
- the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
- the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website, computer, terminal device, network A device, computing device or data center transmits data to another website site, computer, terminal device, network device, computing device or data center for transmission.
- the computer-readable storage medium may be any available medium that can be stored by a computer, or a data storage device such as a terminal device, a network device, a data center, etc. that includes one or more available media integrated.
- the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), and the like.
- B corresponding to A means that B is associated with A, and B can be determined according to A.
- determining B according to A does not mean that B is only determined according to A, and B may also be determined according to A and/or other information.
- the disclosed system, apparatus and method may be implemented in other manners.
- the apparatus embodiments described above are only illustrative.
- the division of units is only a logical function division.
- there may be other division methods for example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
- the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
- Modules described as separate components may or may not be physically separated, and components shown as modules may or may not be physical modules, that is, they may be located in one place, or may be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
- each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically alone, or two or more modules may be integrated into one module.
- the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
- the integrated modules if implemented in the form of software functional modules and sold or used as independent products, can be stored in a computer-readable storage medium.
- the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present application.
- a computer device which may be a personal computer, a server, or a network device, etc.
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Abstract
Description
Claims (36)
- 一种信道侦听的方法,其特征在于,所述方法应用于不能同时收发多链路设备NSTR MLD,所述方法包括:所述不能同时收发多链路设备包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为确认块BA,所述第二帧为BA,所述第一帧的结束时间晚于所述第二帧的结束时间;所述NSTR MLD确定所述第一帧和所述第二帧中的至少一个传输失败;所述第一STA在所述第一帧结束后,在第一帧间间隔进行信道侦听,其中,所述第一帧间间隔的时间长度小于或等于点协调功能帧间间隔PIFS的时间长度,或者,所述第二STA在所述第二帧结束后,在第二帧间间隔进行信道侦听,其中,所述第二帧间间隔的时间长度大于或等于短帧间距SIFS的时间长度且小于或等于PIFS的时间长度。
- 根据权利要求1所述的方法,其特征在于,当所述第一帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒。
- 根据权利要求1-2中任一项所述的方法,其特征在于,当所述第二帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒,或,所述第一时间的取值范围为0-8微秒,或,所述第一时间的取值范围为0-9微秒,或,所述第一时间的取值范围为0-12微秒。
- 根据权利要求1-3中任一项所述的方法,其特征在于,当所述第一帧传输失败和所述第二帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒。
- 根据权利要求1-4中任一项所述的方法,其特征在于,当所述第一帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒。
- 根据权利要求1-5中任一项所述的方法,其特征在于,当所述第二帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒,或所述第二时间的取值范围为0-8微秒。
- 根据权利要求1-6中任一项所述的方法,其特征在于,当所述第一帧传输失败和所述第二帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒,或所述第二时间的取值范围为0-8微秒。
- 一种信道侦听的方法,其特征在于,所述方法应用于不能同时收发多链路设备NSTR MLD,所述方法包括:所述不能同时收发多链路设备包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为物理层协议数据单元PPDU,所述第二帧为PPDU,所述第一帧的结束时间晚于所述第二帧的结束时间;所述NSTR MLD确定所述第一帧和所述第二帧传输失败;所述第一STA在所述第一帧结束后,在第三帧间间隔进行信道侦听,所述第三帧间间隔小于或等于PIFS的时间长度;或者,所述第二STA在所述第二帧结束后,在第四帧间间隔进行信道侦听,所述第四帧间间隔大于或等于短帧间距SIFS的时间长度且小于或等于PIFS的时间长度。
- 根据权利要求8所述的方法,其特征在于,所述第三帧间间隔的时间为PIFS与第三时间的差值;所述第三时间的取值范围为0-4微秒,或,所述第三时间的取值范围为0-8微秒。
- 根据权利要求8-9中任一项所述的方法,其特征在于,所述第四帧间间隔的时间为短帧间距SIFS与第四时间之和;所述第四时间的取值范围为0-4微秒,或所述第四时间的取值范围为0-8微秒。
- 根据权利要求8-10中任一项所述的方法,其特征在于,所述方法还包括:所述第二STA在所述第二帧结束后,经过第五时间后在第五帧间间隔进行信道侦听,其中,所述第五帧间间隔的时间长度与所述第五时间之和小于或等于PIFS的时间长度。
- 根据权利要求11所述的方法,其特征在于,所述第五时间的取值范围为0-8微秒。
- 一种信道侦听的方法,其特征在于,所述方法应用于不能同时收发多链路设备NSTR MLD,所述方法包括:所述不能同时收发多链路设备包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为确认块物理层协议数据单元PPDU,所述第二帧为PPDU,所述第一帧的结束时间晚于所述第二帧的结束时间;所述第二STA在所述第二帧结束后,在第六帧间间隔进行信道侦听,所述第六帧间间隔的时间为确认超时AckTimeout与第六时间之和。
- 根据权利要求13所述的方法,其特征在于,所述第六时间的取值范围为0-4微秒。
- 根据权利要求13-14中任一项所述的方法,其特征在于,所述方法还包括:所述第二STA在所述第二帧结束后,经过第七时间后在第七帧间间隔进行信道侦听,所述第七时间与所述第七帧间间隔之和等于所述第六帧间间隔的时间长度。
- 根据权利要求15所述的方法,其特征在于,所述第七时间的取值范围为0-8微秒。
- 一种不能同时收发多链路设备NSTR MLD,其特征在于,所述不能同时收发多链路设备包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为确认块BA,所述第二帧为BA,所述第一帧的结束时间晚于所述第二帧的结束时间,所述NSTR MLD包括:处理模块和侦听模块;所述处理模块,用于确定所述第一帧和所述第二帧中的至少一个传输失败;所述侦听模块,用于在所述第一帧结束后,在第一帧间间隔进行信道侦听,其中,所述第一帧间间隔的时间长度小于或等于点协调功能帧间间隔PIFS的时间长度,或者,所述侦听模块,用于在所述第二帧结束后,在第二帧间间隔进行信道侦听,其中,所述第二帧间间隔的时间长度大于或等于短帧间距SIFS的时间长度且小于或等于PIFS 的时间长度。
- 根据权利要求17所述的NSTR MLD,其特征在于,当所述第一帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒。
- 根据权利要求17-18中任一项所述的NSTR MLD,其特征在于,当所述第二帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒,或,所述第一时间的取值范围为0-8微秒,或,所述第一时间的取值范围为0-9微秒,或,所述第一时间的取值范围为0-12微秒。
- 根据权利要求17-19中任一项所述的NSTR MLD,其特征在于,当所述第一帧传输失败和所述第二帧传输失败时,所述第一帧间间隔的时间为PIFS与第一时间的差值;所述第一时间的取值范围为0-4微秒。
- 根据权利要求17-20中任一项所述的NSTR MLD,其特征在于,当所述第一帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒。
- 根据权利要求17-21中任一项所述的NSTR MLD,其特征在于,当所述第二帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒,或所述第二时间的取值范围为0-8微秒。
- 根据权利要求17-22中任一项所述的NSTR MLD,其特征在于,当所述第一帧传输失败和所述第二帧传输失败时,所述第二帧间间隔的时间为短帧间距SIFS与第二时间之和;所述第二时间的取值范围为0-4微秒,或所述第二时间的取值范围为0-8微秒。
- 一种不能同时收发多链路设备NSTR MLD,其特征在于,所述NSTR MLD包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为物理层协议数据单元PPDU,所述第二帧为PPDU,所述第一帧的结束时间晚于所述第二帧的结束时间,所述NSTR MLD包括:处理模块和侦听模块;所述处理模块,用于确定所述第一帧和所述第二帧传输失败;所述侦听模块,用于在所述第一帧结束后,在第三帧间间隔进行信道侦听,所述第三帧间间隔小于或等于PIFS的时间长度;或者,所述侦听模块,还用于在所述第二帧结束后,在第四帧间间隔进行信道侦听,所述第四帧间间隔大于或等于短帧间距SIFS的时间长度且小于或等于PIFS的时间长度。
- 根据权利要求24所述的NSTR MLD,其特征在于,所述第三帧间间隔的时间为PIFS与第三时间的差值;所述第三时间的取值范围为0-4微秒,或,所述第三时间的取值范围为0-8微秒,或,所述第三时间的取值范围为0-9微秒。
- 根据权利要求24-25中任一项所述的NSTR MLD,其特征在于,所述第四帧间间隔的时间为短帧间距SIFS与第四时间之和;所述第四时间的取值范围为0-4微秒,或所述第四时间的取值范围为0-8微秒。
- 根据权利要求24-26中任一项所述的NSTR MLD,其特征在于,所述侦听模块,还用于在所述第二帧结束后,经过第五时间后在第五帧间间隔进行信道侦听,其中,所述第五帧间间隔的时间长度与所述第五时间之和小于或等于PIFS的时间长度。
- 根据权利要求27所述的NSTR MLD,其特征在于,所述第五时间的取值范围为0-8微秒。
- 一种不能同时收发多链路设备NSTR MLD,其特征在于,所述NSTR MLD包括第一站点STA和第二站点STA,其中,所述第一STA在第一链路上传输第一帧,所述第二STA在第二链路上传输第二帧,所述第一帧为物理层协议数据单元PPDU,所述第二帧为PPDU,所述第一帧的结束时间晚于所述第二帧的结束时间,所述NSTR MLD包括:处理模块和侦听模块;所述处理模块,用于确定所述第一帧和所述第二帧传输失败;所述侦听模块,用于在所述第二帧结束后,在第六帧间间隔进行信道侦听,所述第六帧间间隔的时间为确认超时AckTimeout与第六时间之和。
- 根据权利要求29所述的NSTR MLD,其特征在于,所述第六时间的取值范围为0-4微秒。
- 根据权利要求29-30中任一项所述的NSTR MLD,其特征在于,所述侦听模块,还用于在所述第二帧结束后,经过第七时间后在第七帧间间隔进行信道侦听,所述第七时间与所述第七帧间间隔的加和等于所述第六帧间间隔的时间长度。
- 根据权利要求31所述的NSTR MLD,其特征在于,所述第七时间的取值范围为0-8微秒。
- 一种多链路设备,其特征在于,所述多链路设备包括:处理器;当所述多链路设备运行时,所述处理器执行存储器存储的计算机执行指令,以使所述多链路设备执行如权利要求1-7,或,权利要求8-12,或,权利要求13-16中任意一项所述的方法。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质包括计算机指令,当所述计算机指令在多链路设备上运行时,使得多链路设备执行如权利要求1-7,或,权利要求8-12,或,权利要求13-16中任一项所述的方法。
- 一种计算机程序产品,其特征在于,所述计算机程序产品包括计算机指令,当所述计算机指令在多链路设备上运行时,使得多链路设备执行如权利要求权利要求1-7,或,权利要求8-12,或,权利要求13-16中任一项所述的方法。
- 一种芯片,其特征在于,所述芯片包括处理器和通信接口,所述通信接口用于与所述芯片之外的模块通信,所述处理器用于运行计算机程序或指令,以实现如权利要求1-7,或,权利要求8-12,或,权利要求13-16中任一项所述的方法。
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