WO2022048548A1 - 多链路设备的信道接入方法及相关装置 - Google Patents
多链路设备的信道接入方法及相关装置 Download PDFInfo
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Definitions
- the present application relates to the field of wireless communication technologies, and in particular, to a channel access method and related apparatus of a multi-link device.
- a wireless communication device With the development of wireless communication technology, more and more wireless communication devices support multi-link communication, such as simultaneous communication on 2.4GHz, 5GHz and 6GHz frequency bands, or simultaneous communication on different channels of the same frequency band.
- Such a wireless communication device is usually called a multi-link device (MLD).
- MLD multi-link device
- a multi-link device can use multiple links for parallel communication, so that the transmission rate is greatly improved.
- multi-link devices can communicate through multiple links in parallel to increase the transmission rate, when the frequency separation between the multiple frequency bands supported by extremely high throughput (EHT) multi-link devices is close, the Sending a signal on one frequency band affects reception on the other frequency band.
- EHT extremely high throughput
- an EHT multi-link device transmits on link 1. Since the frequency interval between link 1 and link 2 is small, the signal transmitted on link 1 will cause channel interference on link 2, affecting the link. Channel 2 accesses and receives information, so this device cannot independently perform transmit and receive operations in multiple frequency bands at the same time to avoid mutual interference.
- the EHT multi-link device can have the ability to transmit and receive at the same time (Simultaneous transmitting and receiving, STR), and can have the ability to transmit and receive at the same time (Not Simultaneous transmitting and receiving, non-STR).
- non-STR MLD When a non-STR capable MLD (referred to as non-STR MLD) is sent on one link, it is in a blind state (blindness period or CCA) because interference affects the clear channel assessment (CCA) on other links. Called deaf period), the blind state means that it cannot listen to any information on the channel or cannot listen to any information on the channel. Therefore, when the non-STR MLD is in a blind state on some links, how the non-STR MLD performs channel access on these links becomes an urgent problem to be solved.
- CCA clear channel assessment
- Embodiments of the present application provide a channel access method and related apparatus for a multi-link device, which can improve the efficiency of channel access when the non-STR MLD is in a blind state/self-interference state.
- the present application provides a channel access method for a multi-link device, the method comprising: when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to a first value , the first multi-link device does not start the media synchronization delay timer on the second link, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the fact that the first multi-link device does not start the media synchronization delay timer on the second link includes: when the first multi-link device performs channel competition on the second link, evaluating the energy used by the CCA for the idle channel
- the detection threshold is set to the first threshold, and the first threshold is -62dBm; or, after the backoff counter on the second link of the first multi-link device backs off to 0, it is allowed to send any other than the RTS frame and the MU-RTS frame. other frames.
- the CCA when the length of the PPDU sent on one link is less than or equal to a certain value, the media synchronization delay timer is not started on the other link, or when channel contention is performed on the other link, the CCA
- the adopted energy detection threshold is set to -62dBm, or it is unnecessary to use RTS frames on the other link for channel protection/channel availability testing, thereby improving the channel access efficiency of the first multi-link device on the other link or the channel access success rate, or improve the channel access opportunity of the first multi-link device on another link.
- the method further includes: receiving the first value by the first multilink device.
- the first value may be carried in a beacon frame, and may also be carried in an association response frame or a reassociation response frame.
- the first value may be carried in a multi-link element, an extremely high throughput operation element, or a newly defined element.
- the method further includes: when the length of the first PPDU is greater than the first value, the first multilink device determines the media synchronization corresponding to the length of the first PPDU the initial value of the delay timer, and start the media synchronization delay timer on the second link with the initial value.
- the method further includes: the first multilink device receives first indication information, where the first indication information is used to indicate the length of a physical layer protocol data unit (PPDU) and a media synchronization delay timer The mapping relationship between the initial values of .
- PPDU physical layer protocol data unit
- the initial value of the media synchronization delay timer is determined according to the length of the first PPDU, so that the setting of the media synchronization delay timer is more flexible.
- the method further includes: when the length of the first PPDU is greater than the first value, the first multi-link device enables the media synchronization on the second link Delay timer; within the time period counted by the media synchronization delay timer, if the first multi-link device performs channel competition on the second link, the energy used by the CCA on the second link is detected
- the threshold is set to a threshold value corresponding to the length of the first PPDU.
- the method further includes: the first multi-link device receives second indication information, where the second indication information is used to indicate that the length of the PPDU is different from that of the PPDU. Mapping relationship between energy detection thresholds.
- the energy detection threshold is determined according to the length of the first PPDU, so that the channel access mechanism on the second link is more flexible, thereby improving the channel access efficiency.
- the present application provides a first multi-link device or a chip in the first multi-link device, such as a Wi-Fi chip.
- the first multilink device may be a non-STR MLD.
- the first multi-link device includes: a processing unit configured to disable media on the second link when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value A synchronization delay timer, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the above-mentioned processing unit is specifically configured to set the energy detection threshold used by the CCA for the idle channel evaluation on the second link as the first threshold, and the first threshold is -62dBm.
- the above-mentioned first multi-link device further includes a transceiving unit configured to transmit other frames except the RTS frame and the MU-RTS frame after the backoff counter on the second link backs off to 0.
- the above-mentioned first multi-link device further includes a transceiver unit, and the transceiver unit is further configured to receive the first value.
- the first value may be carried in a beacon frame, and may also be carried in an association response frame or a reassociation response frame.
- the first value may be carried in a multi-link element, an extremely high throughput operation element, or a newly defined element.
- the above processing unit is further configured to: when the length of the first PPDU is greater than the first value, determine a media synchronization delay timer corresponding to the length of the first PPDU and start the media synchronization delay timer on the second link with the initial value.
- the above-mentioned first multi-link device further includes a transceiver unit, and the transceiver unit is further configured to: receive first indication information, where the first indication information is used to indicate the difference between the length of the PPDU and the initial value of the media synchronization delay timer. mapping relationship between.
- the above processing unit is further configured to: when the length of the first PPDU is greater than the first value, start the media synchronization delay timer on the second link ; In the time period of this media synchronization delay timer, if the first multi-link device performs channel competition on this second link, then the energy detection threshold adopted by CCA on the second link is set to this Threshold value corresponding to the length of the first PPDU.
- the above-mentioned first multi-link device further includes a transceiver unit, and the transceiver unit is further configured to: the first multi-link device receives second indication information, and the second indication information is used to indicate the length of the PPDU and the energy detection threshold. mapping relationship between.
- the present application provides a channel access method for a multi-link device, the method comprising: when the type of the first frame sent by the first multi-link device on the first link is the first type, the first A multi-link device does not start the media synchronization delay timer on the second link, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the fact that the first multi-link device does not start the media synchronization delay timer on the second link includes: when the first multi-link device performs channel competition on the second link, evaluating the energy used by the CCA for the idle channel
- the detection threshold is set to the first threshold, and the first threshold is -62dBm; or, after the backoff counter on the second link of the first multi-link device backs off to 0, it is allowed to send any other than the RTS frame and the MU-RTS frame. other frames.
- the type of the first frame is the first type: request to send (request to send, RTS) frame, multiple user request to send (multiple user RTS, MU-RTS) frame, Power save-Poll (PS-Poll) frame, CTS frame, status report (buffer status report, BSR) frame, bandwidth query report (bandwidth query report, BQR) frame, null data packet (null data) packet, NDP) frame, acknowledgement (acknowledge, ACK) frame, (block ACK, BA) block acknowledgement frame.
- the above-mentioned first frame is a request to send (request to send, RTS) frame or a multiple user request to send (multiple user RTS, MU-RTS) frame. If the first multi-link device does not receive a clear to send (CTS) frame on the first link within a preset time, the first multi-link device does not open media on the second link Synchronization delay timer.
- RTS request to send
- MU-RTS multiple user request to send
- the foregoing first frame is a power save-poll (Power save-Poll, PS-Poll) frame. If the first multi-link device does not receive a PS-Poll frame allowed to send on the first link within a preset time, the first multi-link device does not start the media synchronization delay timer on the second link device.
- a PS-Poll frame allowed to send on the first link within a preset time
- the first multi-link device does not start the media synchronization delay timer on the second link device.
- the above-mentioned first frame is a CTS frame.
- the method further includes: the first multi-link device receives the RTS frame or the MU-RTS frame on the first link.
- the above-mentioned first frame is a status report BSR frame.
- the method further includes: the first multilink device receives a status report polling BSRP trigger frame on the first link.
- the above-mentioned first frame is a bandwidth query report BQR frame.
- the method further includes: the first multi-link device receives a bandwidth query report polling BQRP trigger frame on the first link.
- the above-mentioned first frame is a null data packet NDP frame.
- the method further includes: the first multi-link device receives a beamforming report polling BFRP trigger frame on the first link.
- the foregoing first frame is an ACK frame or a BA frame.
- the first multilink device receives the data frame or the management frame on the first link.
- the present application provides a first multi-link device or a chip in the first multi-link device, such as a Wi-Fi chip.
- the first multilink device may be a non-STR MLD.
- the first multi-link device includes: a processing unit configured to, when the type of the first frame sent by the first multi-link device on the first link is the first type, the first multi-link device on the second link The media synchronization delay timer is not started on the road, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the above-mentioned processing unit is specifically configured to set the energy detection threshold used by the CCA for the idle channel evaluation on the second link as the first threshold, and the first threshold is -62dBm.
- the above-mentioned first multi-link device further includes a transceiving unit configured to transmit other frames except the RTS frame and the MU-RTS frame after the backoff counter on the second link backs off to 0.
- the type of the first frame is the first type: request to send (request to send, RTS) frame, multiple user request to send (multiple user RTS, MU-RTS) frame, Power save-Poll (PS-Poll) frame, CTS frame, status report (buffer status report, BSR) frame, bandwidth query report (bandwidth query report, BQR) frame, null data packet (null data) packet, NDP) frame, acknowledgement (acknowledge, ACK) frame, (block ACK, BA) block acknowledgement frame.
- the above-mentioned first frame is an RTS frame or a MU-RTS frame.
- the above processing unit is specifically used for: when the first multi-link device does not receive a clear to send (CTS) frame on the first link within a preset time, the media is not opened on the second link Synchronization delay timer.
- CTS clear to send
- the above-mentioned first frame is a PS-Poll frame.
- the above-mentioned processing unit is specifically used for: when the first multi-link device does not receive a PS-Poll frame allowed to be sent on the first link within a preset time, the media synchronization delay timer is not started on the second link .
- the above-mentioned first frame is a CTS frame.
- the first multi-link device further includes a transceiving unit configured to: receive the RTS frame or the MU-RTS frame on the first link.
- the above-mentioned first PPDU is a status report BSR frame.
- the first multi-link device further includes a transceiving unit, and the transceiving unit is configured to: receive a status report polling BSRP trigger frame on the first link.
- the above-mentioned first PPDU is a bandwidth query report BQR frame.
- the first multi-link device further includes a transceiving unit, which is configured to: receive a bandwidth query report polling BQRP trigger frame on the first link.
- the above-mentioned first PPDU is a null data packet NDP frame.
- the first multi-link device further includes a transceiver unit configured to: receive a beamforming report polling BFRP trigger frame on the first link.
- the above-mentioned first PPDU is an ACK frame or a BA frame.
- the first multi-link device further includes a transceiver unit, which is used for: receiving a data frame or a management frame on the first link.
- the present application provides a method for determining an initial duration of a media synchronization delay timer, the method comprising: a first multilink device receiving first indication information, where the first indication information is used to indicate that the length of the PPDU is synchronized with the media The mapping relationship between the initial values (or initial durations) of the delay timer; the first multi-link device determines the media synchronization time corresponding to the length of the first PPDU according to the length of the first PPDU sent on the first link The initial value of the delay timer is used to determine whether to start the media synchronization delay timer on the second link. The first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the first multi-link device determines whether to enable the media synchronization delay timer on the second link according to the initial value of the media synchronization delay timer corresponding to the length of the first PPDU.
- the first multi-link device does not start the media synchronization delay timer on the second link. If the determined initial value of the media synchronization delay timer is equal to 0, the first multi-link device starts the media synchronization delay timer with the initial value on the second link.
- the first multi-link device when the first multi-link device starts the mediumSyncDelay timer on the second link, it can be understood (or can be described as): during the period of time counted by the mediumSyncDelay timer, the first multi-link device can start the mediumSyncDelay timer on the second link.
- a more conservative channel access mechanism is used on the link.
- a more conservative signal access mechanism includes but is not limited to: 1) Using a lower energy detection threshold (here refers to an ED threshold lower than -62dBm) to determine whether the channel is busy. 2) RTS frames must be sent to test channel availability.
- the present application provides a method for determining the initial duration of a media synchronization delay timer.
- the method includes: a second multilink device generates and sends first indication information, where the first indication information is used to indicate that the length of the PPDU is equal to the length of the PPDU.
- the present application provides a first multi-link device or a chip in the first multi-link device, such as a Wi-Fi chip.
- the first multilink device may be a non-STR MLD.
- the communication device includes: a transceiver unit for receiving first indication information, where the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value of the media synchronization delay timer; The length of the first PPDU sent on the link determines the initial value of the media synchronization delay timer corresponding to the length of the first PPDU.
- the communication device cannot transmit and receive simultaneously on the first link and the second link.
- the above processing unit is further configured to determine whether to enable the media synchronization delay timer on the second link according to the initial value of the media synchronization delay timer corresponding to the length of the first PPDU.
- the above processing unit is specifically configured to: if the determined initial value of the media synchronization delay timer is equal to 0, do not start the media synchronization delay timer on the second link; if the determined media synchronization delay timer is If the initial value of the synchronization delay timer is equal to 0, the media synchronization delay timer is started on the second link.
- the present application provides a second multi-link device or a chip in the second multi-link device, such as a Wi-Fi chip.
- the second multilink device may be an MLD of STR.
- the communication device includes: a processing unit configured to generate first indication information, where the first indication information is used to indicate a mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer; a transceiver unit, for sending the first indication information.
- the present application provides a method for determining an energy detection threshold in a CCA process, the method comprising: a first multilink device receiving second indication information, where the second indication information is used to indicate a distance between a PPDU length and an energy detection threshold
- the first multi-link device sends the first PPDU on the first link; the first multi-link device determines the corresponding length of the first PPDU according to the length of the first PPDU sent on the first link.
- the energy detection threshold is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the first multi-link device determines whether to enable the media synchronization delay timer on the second link according to an energy detection threshold corresponding to the length of the first PPDU.
- the first multi-link device does not start the media synchronization delay timer on the second link. If the determined energy detection threshold is less than -62dBm, the first multi-link device starts the media synchronization delay timer on the second link.
- the present application provides a method for determining an energy detection threshold in a CCA process, the method comprising: a second multilink device generates and sends second indication information, where the second indication information is used to indicate the length of the PPDU and the energy detection threshold the mapping relationship between them.
- the present application provides a first multi-link device or a chip in the first multi-link device, such as a Wi-Fi chip.
- the first multilink device may be a non-STR MLD.
- the communication device includes: a transceiver unit for receiving second indication information, where the second indication information is used to indicate the mapping relationship between the PPDU length and the energy detection threshold; a processing unit for The length of the first PPDU determines an energy detection threshold corresponding to the length of the first PPDU, and the energy detection threshold is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the above processing unit is further configured to determine whether to start the media synchronization delay timer on the second link according to the energy detection threshold corresponding to the length of the first PPDU.
- the communication device cannot transmit and receive simultaneously on the first link and the second link.
- the above processing unit is specifically configured to: if the determined energy detection threshold is equal to -62dBm, the first multi-link device does not start the media synchronization delay timer on the second link; If the energy detection threshold is less than -62dBm, the first multi-link device starts the media synchronization delay timer on the second link.
- the present application provides a second multi-link device or a chip in the second multi-link device, such as a Wi-Fi chip.
- the second multilink device may be an MLD of STR.
- the communication device includes: a processing unit for generating second indication information, where the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold; and a transceiver unit for sending the second indication information.
- the present application provides a first multilink device, including a processor.
- a transceiver is also included.
- the processor is configured to not start the media synchronization delay timer on the second link when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value, wherein the first A multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the processor is configured to, when the type of the first frame sent by the first multi-link device on the first link is the first type, the first multi-link device on the second link The media synchronization delay timer is not started, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is configured to receive first indication information, where the first indication information is used to indicate the mapping relationship between the PPDU length and the initial value (or initial duration) of the media synchronization delay timer; the The processor is configured to determine, according to the length of the first PPDU sent on the first link, an initial value of the media synchronization delay timer corresponding to the length of the first PPDU.
- the communication device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is configured to receive second indication information, where the second indication information is used to indicate the mapping relationship between the PPDU length/byte length and the energy detection threshold; the processor is configured to The length of the first PPDU sent on the link determines the energy detection threshold corresponding to the length of the first PPDU, and the energy detection threshold is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the present application provides a second multilink device including a processor and a transceiver.
- the processor is used to generate first indication information, where the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer; the transceiver is used to send the first indication information.
- the processor is configured to generate second indication information, where the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold; the transceiver is used to send the second indication information.
- the present application provides a first multi-link device
- the first multi-link device can exist in the form of a chip
- the structure of the first multi-link device includes an input and output interface and a processing circuit.
- the input and output interface is used for receiving the code instruction and transmitting it to the processing circuit
- the processing circuit is used for not starting the media synchronization delay timer on the second link when the length of the first PPDU is less than or equal to the first value, Wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the input and output interface is used for receiving the code instruction and transmitting it to the processing circuit, and the processing circuit is used for when the type of the first frame sent by the first multi-link device on the first link is In the first type, the first multi-link device does not start the media synchronization delay timer on the second link, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive the first indication information
- the input and output interface is used to receive the first indication information from the transceiver, and send the first indication information to the processing circuit for processing to obtain the The mapping relationship between the PPDU length indicated by the first indication information and the initial value (or initial duration) of the media synchronization delay timer;
- the processing circuit is used to determine the length of the first PPDU sent on the first link.
- the initial value of the media synchronization delay timer corresponding to the length of the first PPDU, where the initial value is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive the second indication information
- the input and output interface is used to receive the second indication information from the transceiver, and send the second indication information to the processing circuit for processing to obtain the The mapping relationship between the PPDU length indicated by the second indication information and the energy detection threshold
- the processing circuit is configured to determine the energy detection threshold corresponding to the length of the first PPDU according to the length of the first PPDU sent on the first link , the energy detection threshold is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the present application provides a second multi-link device
- the second multi-link device can exist in the form of a chip product
- the structure of the second multi-link device includes an input and output interface and a processing circuit.
- the input and output interface is used for receiving a code instruction and transmitting it to the processing circuit
- the processing circuit is used for generating first indication information, where the first indication information is used for indicating the length of the PPDU and the initial value (or initial value of the media synchronization delay timer) of the timer. duration);
- the input and output interface is used for sending the first indication information to the transceiver, and the transceiver is used for sending the first indication information.
- the I/O interface is used to receive code instructions and transmit them to the processing circuit, and the processing circuit is used to generate second indication information, where the second indication information is used to indicate the difference between the length of the PPDU and the energy detection threshold
- the mapping relationship between; the input and output interface is used for sending the second indication information to the transceiver, and the transceiver is used for sending the second indication information.
- the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is made to execute the above-mentioned first aspect, or the above-mentioned third aspect, Or the method described in the above fifth aspect, or the above seventh aspect, or the above ninth aspect, or the above tenth aspect.
- the present application provides a computer program product comprising program instructions, which, when run on a computer, enables the computer to execute the above-mentioned first aspect, or the above-mentioned third aspect, or the above-mentioned fifth aspect, or the above-mentioned seventh aspect aspect, or the method of the ninth aspect above, or the method of the tenth aspect above.
- the efficiency of channel access can be improved when the non-STR MLD is in a blind state/self-interference state.
- Fig. 1 is a schematic diagram of non-AP MLD and AP MLD communication provided by an embodiment of the present application
- FIG. 2 is a schematic structural diagram of a wireless communication system provided by an embodiment of the present application.
- 3a is a schematic structural diagram of a multi-link device provided by an embodiment of the present application.
- FIG. 3b is another schematic structural diagram of a multi-link device provided by an embodiment of the present application.
- FIG. 4 is a schematic flowchart of a channel access method for a multi-link device provided by an embodiment of the present application
- FIG. 5 is another schematic flowchart of a channel access method for a multi-link device provided by an embodiment of the present application
- 6a is a schematic diagram of a frame structure of a multi-link element provided by an embodiment of the present application.
- 6b is a schematic diagram of a frame structure of an EHT operation element provided by an embodiment of the present application.
- 6c is a schematic diagram of a frame structure of a non-STR MLD parameter set element provided by the present application.
- FIG. 7 is a schematic flowchart of a method for determining an initial duration of a media synchronization delay timer provided by an embodiment of the present application
- FIG. 8 is a schematic diagram of a mapping relationship between a PPDU length and an initial value of a media synchronization delay timer provided by an embodiment of the present application;
- FIG. 9 is a schematic flowchart of a method for determining an energy detection threshold in a CCA process provided by an embodiment of the present application.
- FIG. 10 is a schematic diagram of a mapping relationship between a PPDU length and an energy detection threshold provided by an embodiment of the present application
- FIG. 11 is a schematic structural diagram of a first multi-link device provided by an embodiment of the present application.
- FIG. 12 is a schematic structural diagram of a second multi-link device provided by an embodiment of the present application.
- the following describes the system architecture and/or application scenarios of the channel access methods for multi-link devices provided by the embodiments of the present application. It is understandable that the system architecture and/or application scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application.
- the embodiment of the present application provides a channel access method applied to a non-STR MLD, which can improve the efficiency of channel access when the non-STR MLD is in a blind state/self-interference state.
- the channel access method of the multi-link device may be implemented by a communication device in a wireless communication system or a chip or processor in the communication device, and the communication device may be a wireless communication device that supports parallel transmission of multiple links, such as , the communication device may be referred to as a multi-link device or a multi-band device. Compared with communication devices that only support single-link transmission, multi-link devices have higher transmission efficiency and greater throughput.
- a multi-link device includes one or more affiliated stations (affiliated STAs), and an affiliated station is a logical station that can work on a link or a frequency band or a channel.
- the affiliated station may be an access point (access point, AP) or a non-access point station (non-access point station, non-AP STA).
- 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 non-AP or a multi-link non-AP device or a non-AP multi-link device (non-AP multi-link device, non-AP MLD).
- a multi-link device may include multiple logical sites, each logical site works on one link, but allows multiple logical sites to work on the same link.
- FIG. 1 is a schematic diagram of communication between a non-AP MLD and an AP MLD provided by an embodiment of the present application.
- AP MLD includes AP1, AP2,...,APn;
- non-AP MLD includes STA1, STA2,...,STAn.
- AP MLD and non-AP MLD can communicate in parallel using link 1, link 2, ..., link n.
- STA1 in non-AP MLD establishes association relationship with AP1 in AP MLD
- STA2 in non-AP MLD establishes association relationship with AP2 in AP MLD
- STAn in non-AP MLD establishes association relationship with APn in AP MLD Wait.
- multi-link devices can implement wireless communication following the IEEE 802.11 series of protocols, for example, for extremely high throughput (EHT) sites, or for sites based on IEEE 802.11be or compatible with IEEE 802.11be support, Enables communication with other devices.
- EHT extremely high throughput
- the channel access method for a multi-link device can be applied to a scenario in which one node communicates with one or more nodes; it can also be applied to a single-user uplink/downlink communication scenario, and a multi-user uplink/downlink communication scenario.
- downlink communication scenarios it can also be applied to device to device (device to device, D2D) communication scenarios.
- any of the above nodes may be AP MLD or non-AP MLD.
- a scenario in which an AP MLD communicates with a non-AP MLD or a scenario in which an AP MLD communicates with an AP MLD, or a scenario in which a non-AP MLD communicates with a non-AP MLD; this embodiment of the present application does not do this. limited.
- At least one node has the capability of not being able to send and receive at the same time, that is, has the non-STR capability.
- FIG. 2 is a schematic structural diagram of a wireless communication system provided by an embodiment of the present application.
- the wireless communication system includes at least one AP MLD and at least one non-AP MLD.
- the AP MLD is a multi-link device that provides services for the non-AP MLD, and the non-AP MLD can communicate with the AP MLD using multiple links.
- An AP in an AP MLD can communicate with a STA in a non-AP MLD over a link. Understandably, the numbers of AP MLDs and non-AP MLDs in FIG. 2 are only exemplary.
- the wireless communication system includes at least one MLD capable of non-STR.
- the multi-link device (here, it can be either a non-AP MLD or an AP MLD) is a device with wireless communication function, and the device can be a device of the whole machine, or it can be installed in the device of the whole machine.
- the chips or processing systems, etc. in the device, the devices on which these chips or processing systems are installed can implement the methods and functions of the embodiments of the present application under the control of these chips or processing systems.
- the non-AP multi-link device in the embodiment of the present application has a wireless transceiver function, can support 802.11 series protocols, and can communicate with the AP multi-link device or other non-AP multi-link devices.
- a non-AP multilink device is any user communication device that allows a user to communicate with an AP and thus with a WLAN.
- the non-AP multi-link device may be a tablet, desktop, laptop, notebook, ultra-mobile personal computer (UMPC), handheld computer, netbook, personal digital assistant (personal digital assistant) , PDA), mobile phones and other user equipment that can be networked, or IoT nodes in the Internet of Things, or in-vehicle communication devices in the Internet of Vehicles, etc.; non-AP multi-link devices can also be the chips and processing systems in these terminals.
- AP multi-link equipment can provide services for non-AP multi-link equipment, and can support 802.11 series protocols.
- the AP multi-link device may be a communication entity such as a communication server, router, switch, and network bridge, or the AP multi-link device may include various forms of macro base station, micro base station, relay station, etc.
- the AP multi-link device Also chips and processing systems in these various forms of devices.
- the 802.11 protocol may be a protocol that supports 802.11be or is compatible with 802.11be.
- multi-link devices can support high-speed and low-latency transmission.
- multi-link devices can also be used in more scenarios, such as sensor nodes in smart cities ( For example, smart water meters, smart electricity meters, smart air detection nodes), smart devices in smart homes (such as smart cameras, projectors, display screens, TVs, stereos, refrigerators, washing machines, etc.), nodes in the Internet of Things, entertainment Terminals (such as AR, VR and other wearable devices), smart devices in smart office (such as printers, projectors, etc.), Internet of Vehicles devices in the Internet of Vehicles, and some infrastructure in daily life scenarios (such as vending machines, commercial Super self-service navigation desk, self-service cash register equipment, self-service ordering machine, etc.).
- the specific form of the multi-link device is not limited in this embodiment of the present application, which is only an exemplary description here.
- FIG. 3a is a schematic structural diagram of a multi-link device provided by an embodiment of the present application.
- the IEEE 802.11 standard focuses on the 802.11 physical layer (PHY) and medium access control (MAC) layers in multilink devices.
- PHY physical layer
- MAC medium access control
- the multiple STAs included in the multi-link device are independent of each other at the low MAC (low MAC) layer and the PHY layer, and are also independent of each other at the high MAC (high MAC) layer.
- FIG. 3b is another schematic structural diagram of a multi-link device provided by an embodiment of the present application.
- the Non-AP multi-link device may adopt a structure in which the high MAC layers are independent of each other, or may adopt a structure shared by the high MAC layers.
- the AP multi-link device may adopt a structure shared by the high MAC layers, or may adopt a structure in which the high MAC layers are independent of each other.
- FIG. 3 a and FIG. 3 b are only exemplary descriptions.
- both the high MAC layer and the low MAC layer may be implemented by a processor in a chip system of a multi-link device, and may also be implemented by different processing modules in a chip system respectively.
- the multi-link device in this embodiment of the present application may be a single-antenna device or a multi-antenna device.
- it may be a device with more than two antennas.
- This embodiment of the present application does not limit the number of antennas included in the multi-link device.
- the multi-link device may allow services of the same access category (AC) to be transmitted on different links, and even allow the same data packets to be transmitted on different links; Services of the same access level are transmitted on different links, but services of different access levels are allowed to be transmitted on different links.
- AC access category
- the frequency band in which the multi-link device operates may include one or more frequency bands among sub 1GHz, 2.4GHz, 5GHz, 6GHz, and high frequency 60GHz.
- non-STR MLD For non-STR MLD, when it is sent on one link (such as link 1), due to channel interference, it will cause non-STR MLD to transmit on another or more links (take link 2 as an example)
- the channel state on link 2 produces incorrect judgments and affects the reception of overlapping basic service set (OBSS) frames on link 2 by the non-STR MLD.
- OBSS overlapping basic service set
- NAV network allocation vector
- NAV can be understood as a countdown timer, which gradually decreases with the passage of time. When the countdown is 0, the medium is considered to be in an idle state. Specifically, after a station receives a frame, if the receiving address of the frame is not the station, the station can update the NAV according to the duration field in the received frame. If the receiving address of the frame is this station, it means that this station is the receiving station, and the NAV cannot be updated. Before updating the NAV, it is also possible to determine whether the value of the duration field in the current frame is greater than the current NAV value of the site, and if it is greater, update the NAV; otherwise, if it is less than or equal to, then do not update the NAV. The NAV value is counted from the end of the received frame.
- the embodiment of the present application proposes a medium synchronization delay (mediumSyncDelay) mechanism.
- the mechanism is as follows: after the non-STR MLD is sent on one line (such as link 1), a timer, that is, the mediumSyncDelay timer, needs to be started on the other link. During the period indicated by the mediumSyncDelay timer, the non-STR MLD needs to use a more conservative channel access mechanism on Link 2.
- the more conservative signal access mechanism includes but is not limited to: 1) Using a lower energy detection (energy detection, ED) threshold to determine whether the channel is busy. In the channel access mechanism, -62dBm is usually used as the energy detection threshold.
- the channel is considered to be busy.
- a lower ED threshold than -62dBm is used, further signals in CCA detection will make the channel busy, so channel access is more conservative.
- the lower energy detection threshold may be -82dBm or -72dBm or the like.
- RTS request to send
- the non-STR MLD In the above-mentioned media synchronization delay mechanism, no matter what kind of frame the non-STR MLD sends on link 1, as long as the frame is sent on link 1, the non-STR MLD will use a more accurate frame on link 2. It is a conservative channel access mechanism.
- the frames sent by the non-STR MLD on link 1 are various, and may be control frames, data frames or management frames, and the data frames may be long frames or short frames. Therefore, when the length of the frame sent by the non-STR MLD on link 1 is shorter, the time that the non-STR MLD is in the blind state on link 2 is correspondingly shorter, and the non-STR MLD misses on link 2.
- the likelihood (or probability) of important information such as NAV is low.
- non-STR MLD is in a blind state on a certain link
- STA working on the link in the non-STR MLD is in a blind state
- blind state mentioned in this application may also be referred to as a "self-interference state” or a “unacceptable state” or a “deaf state”, etc.
- non-STR MLD in this application may refer to an EHT MLD that cannot transmit and receive at the same time.
- the "long frame” and “short frame” mentioned in this application are distinguished by the time length of the frame occupying the air interface.
- a “long frame” may refer to a frame occupying the air interface for a time length greater than or equal to the preset value A
- a “short frame” may refer to a frame occupying the air interface for a time length less than or equal to the preset value B.
- the preset value A and the preset value B may be the same or different.
- the preset value A may be 1ms (milliseconds)
- the preset value B may be 100us (microseconds).
- the embodiment of the present application provides a channel access method for a multi-link device, which can improve the channel access efficiency of the non-STR MLD on these links when the non-STR MLD is in a blind state/self-interference state.
- the first multi-link device in this application may be a non-STR MLD; the second multi-link device may be a STR MLD.
- the present application takes a scenario in which two MLDs communicate through two or more links as an example for description.
- two links are taken as an example to introduce the technical solution of the present application, but the technical solution of the present application is also applicable to two MLDs supporting multiple links.
- Embodiment 1 describes how to perform channel access on another link when a frame of a specific type is sent on one link.
- the second embodiment describes whether it is necessary to adopt a more conservative channel access mechanism on another link according to the length of the frame sent on one link.
- the third embodiment describes how to determine the initial duration of the mediumSyncDelay timer.
- Embodiment 4 describes how to determine the ED threshold used in the CCA process.
- Embodiments 1 to 4 are respectively described in detail below. It is understandable that the technical solutions described in Embodiment 1 to Embodiment 4 of the present application can be combined to form a new embodiment.
- Embodiment 1 of the present application introduces whether a more conservative channel access mechanism needs to be adopted on another link is determined according to the type of frames sent on one link.
- FIG. 4 is a schematic flowchart of a channel access method for a multi-link device provided by an embodiment of the present application. As shown in Figure 4, the channel access method of the multi-link device includes but is not limited to the following steps:
- the first multi-link device when the type of the first frame sent by the first multi-link device on the first link is the first type, the first multi-link device does not start the media synchronization delay timer on the second link, and the first multi-link device does not start the media synchronization delay timer on the second link.
- a multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the type of the first frame is the first type: request to send (request to send) frame, multiple user request to send (multiple user RTS) frame, power saving polling (Power save-Poll, PS-Poll) frame, clear to send (CTS) frame, status report (buffer status report, BSR) frame, bandwidth query report (bandwidth query report, BQR) frame, null data packet (null data) packet, NDP) frame, acknowledgment A (acknowledge, ACK) frame, block acknowledgement (block acknowledge, BA) frame.
- the first frame is an RTS frame or a MU-RTS frame.
- the first multi-link device sends an RTS frame or a MU-RTS frame on the first link, and the first multi-link device does not receive an allow-to-send frame within a preset time, the first multi-link device The device does not start the media synchronization delay timer (mediumSyncDelay timer) on the second link. Wherein, the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- media synchronization delay timer mediumSyncDelay timer
- the first multi-link device finishes sending the RTS/MU-RTS frame on the first link, it adds a preset time (eg, short inter-frame space, SIFS) with a The time of the slot (slot), plus the receiving delay of the physical layer, that is, a SIFS Time+a Slot Time+a RxPHYStartDelay) does not receive the CTS frame on the first link, then the first multi-link device The mediumSyncDelay timer is not started on the second link.
- a preset time eg, short inter-frame space, SIFS
- the fact that the first multi-link device does not start the mediumSyncDelay timer on the second link can be understood (or can be described as): when the first multi-link device performs channel competition on the second link, the CCA operation
- the adopted energy detection threshold is the first threshold; or, after the first multi-link device backs off to 0 on the second link, it is allowed to directly send other frames except RTS and MU-RTS frames, in other words, the first After the multi-link device backs off to 0 on the second link, it does not send an RTS/MU-RTS frame to perform channel protection/test for channel availability.
- the first threshold may be -62dBm.
- the reason why the first multi-link device does not receive the CTS frame within the preset time may be: (a) the first multi-link device The sent RTS frame collided with a frame sent by another device. (b) The receiver corresponding to the RTS frame sent by the first multi-link device fails to successfully receive the RTS frame. (c) The receiver corresponding to the RTS frame sent by the first multi-link device is in a busy state.
- the first multi-link device closes (or stops, or cancels) the mediumSyncDelay timer.
- the first multi-link device may start the mediumSyncDelay timer.
- the first multi-link device starts the mediumSyncDelay timer on the second link, which can be understood (or can be described as): the first multi-link device adopts a more conservative channel access mechanism on the second link . That is, a lower energy detection threshold (referring to a lower energy detection threshold than -62dBm, such as -82dBm) is used to determine whether the channel is busy, and RTS/MU-RTS frames must be sent to test channel availability.
- the number of times (or the number of times of sending the RTS/MU-RTS frame) of the trial can only be one, or a limited number of times.
- the "RTS frame or MU-RTS frame" in the first implementation manner above can be replaced with a success rate saving polling (Power save-Poll, PS-Poll) frame, and the "CTS frame” can be replaced with a data frame or An acknowledgement (ACK) frame. Therefore, the above-mentioned first implementation manner can also be described as: if the first multi-link device sends a PS-Poll frame on the first link, and the first multi-link device does not receive a data frame within the preset time or confirmation frame, the first multi-link device does not start the media synchronization delay timer on the second link.
- a success rate saving polling Power save-Poll, PS-Poll
- ACK An acknowledgement
- the first multi-link device sends a PS-Poll frame on the first link, and the first multi-link device receives a data frame or an acknowledgment frame within the preset time, the first multi-link device
- the mediumSyncDelay timer can be started.
- the non-STR MLD that is, the first multi-link device
- the second link Do not start the mediumSyncDelay timer on the second link, so that the non-STR MLD performs ordinary channel competition on the second link, that is, the energy detection threshold used in CCA operation is -62dBm, or RTS/CTS frames can be used for channel protection.
- the channel access efficiency or channel access success rate of the non-STR MLD on the second link is improved, or the channel access opportunity of the non-STR MLD on the second link is improved.
- the first frame is a CTS frame.
- the first multi-link device receives RTS frames or MU-RTS frames on the first link, and replies/transmits CTS frames on the first link, media synchronization is not enabled on the second link Delay timer (mediumSyncDelay timer).
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the second multilink device transmits RTS frames or MU-RTS frames on the first link.
- the first multi-link device receives the RTS frame or the MU-RTS frame on the first link, and replies/transmits the CTS frame on the first link. After the first multi-link device sends the CTS frame on the first link, it does not start the mediumSyncDelay timer on the second link.
- the fact that the first multi-link device does not start the mediumSyncDelay timer on the second link can be understood (or can be described as): when the first multi-link device performs channel competition on the second link, the CCA operation
- the adopted energy detection threshold is the first threshold; or, after the first multi-link device backs off to 0 on the second link, it is allowed to directly send other frames except RTS and MU-RTS frames, in other words, the first After the multi-link device backs off to 0 on the second link, it does not send an RTS/MU-RTS frame to perform channel protection/test for channel availability.
- the first threshold may be -62dBm.
- the first multi-link device if the first multi-link device has started the mediumSyncDelay timer on the second link after sending the CTS frame on the first link, the first multi-link device is closed (or stopped, or canceled) The mediumSyncDelay timer.
- the "RTS/CTS frame" in the second implementation manner above may be replaced with a status report poll trigger (buffer status report poll trigger, BSRP Trigger) frame/status report (buffer status report, BSR) frame, or Bandwidth query report poll trigger (bandwidth query report poll trigger, BQRP Trigger) frame/bandwidth query report (BQR), or beamforming report poll trigger (beamforming report poll trigger, BFRP Trigger) frame/null data packet (null data packet, NDP) frame, or data frame/acknowledge (ACK) frame, or management frame/ACK frame, or data frame/block acknowledge (BA) frame.
- a status report poll trigger buffer status report poll trigger, BSRP Trigger
- Bandwidth query report poll trigger bandwidth query report poll trigger, BQRP Trigger
- beamforming report poll trigger beamforming report poll trigger
- BFRP Trigger frame/null data packet (null data packet, NDP) frame, or data frame/acknowledge (ACK) frame, or management frame/ACK frame
- the above-mentioned step S201 can also be described as: the first multi-link device receives the BSRP Trigger frame on the first link, and replies/transmits the BSR frame on the first link; Receive a BQRP Trigger frame on the first link, and reply/transmit a BQR frame on the first link; or, the first multi-link device receives a BFRP Trigger frame on the first link, and sends a reply/send NDP frames on the first link; or, the first multi-link device receives data frames or management frames on the first link, and replies/sends ACK frames on the first link; or, the first multi-link device Data frames are received on the first link and BA frames are replied/transmitted on the first link.
- the above-mentioned second implementation manner can also be described as: after the first multi-link device sends a BSR frame or a BQR frame or an NDP frame on the first link, the media synchronization delay is not enabled on the second link. timer.
- the first multi-link device replies/sends a CTS frame, or an NDP frame, or a BSR frame, or a BQR frame, or an ACK frame, or a BA frame on the first link
- the first multi-link device is The first link is in the receiving state, so the reception on the first link does not affect the channel contention on the second link.
- the first multi-link device can perform common channel competition on the second link, that is, the energy detection threshold used in the CCA operation is -62dBm, or the RTS/CTS frame may not be used for channel protection.
- the non-STR MLD that is, the first multi-link device
- the mediumSyncDelay timer can improve the channel access efficiency or channel access success rate of the non-STR MLD on the second link, or improve the channel access opportunity of the non-STR MLD on the second link.
- the media synchronization delay timer when a specific type of frame is sent, the media synchronization delay timer is not started on the second link, and the non-STR MLD can be improved when the non-STR MLD is in a blind state/self-interference state.
- the second implementation of this application introduces how the non-STR MLD performs channel access on the second link when the length of the PPDU sent by the non-STR MLD on the first link is less than the preset value.
- FIG. 5 is another schematic flowchart of a channel access method for a multi-link device provided by an embodiment of the present application. As shown in Figure 5, the channel access method of the multi-link device includes but is not limited to the following steps:
- the first multi-link device when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value, the first multi-link device does not start the media synchronization delay timer on the second link , wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the fact that the first multi-link device does not start the mediumSyncDelay timer on the second link can be understood (or can be described as): when the first multi-link device performs channel competition on the second link, the CCA operation
- the adopted energy detection threshold is the first threshold; or, after the first multi-link device backs off to 0 on the second link, it is allowed to directly send other frames except RTS and MU-RTS frames, in other words, the first After the multi-link device backs off to 0 on the second link, it does not send an RTS/MU-RTS frame to perform channel protection/test for channel availability.
- the first threshold may be -62dBm.
- the first multi-link device if the first multi-link device has started the mediumSyncDelay timer on the second link after sending the first PPDU on the first link, it is determined that the length of the first PPDU is less than or equal to the first PPDU. value, the first multilink device closes (or stops, or cancels) the mediumSyncDelay timer.
- the first multi-link device when the media synchronization delay timer on the second link has been started, if the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value , the first multi-link device does not update the media synchronization delay timer on the second link.
- the first A multi-link device needs to update the media synchronization delay timer on the second link.
- the first multi-link device updates the media synchronization delay timer on the second link, it can be understood as: updating the media synchronization delay timer on the second link to the media synchronization delay timer
- the initial value when turned on is equivalent to restarting the media synchronization delay timer on the second link.
- the first multi-link device does not update the media synchronization delay timer on the second link, which can be understood as: it does not update the media synchronization delay timer on the second link to the media synchronization delay The initial value when the timer starts.
- the above-mentioned first value may be a fixed value specified by the protocol, such as 50us, or 100us, or 200us, or the like.
- the first value may be 28us, which is the PPDU length when the CTS and ACK frames are sent in the 24Mbps Non-HT PPDU format, or when the CTS and ACK frames are sent in the 24Mbps Non-HT duplicate PPDU format. PPDU length.
- the first value may be 32us, which is the length of the PPDU when the BA (block acknowledgment, block ACK) frame with a bitmap length of 64 is sent in the Non-HT PPDU format or Non-HT duplicate PPDU format of 24Mbps. .
- the first value may be 44us, which is the PPDU length when the CTS and ACK frames are sent in the 6Mbps Non-HT PPDU format, or when the CTS and ACK frames are sent in the 6Mbps Non-HT duplicate PPDU format. PPDU length.
- the first value may be 40us, where 40us is the PPDU length when the BA frame with the bitmap length of 256 is sent in the Non-HT PPDU format or Non-HT duplicate PPDU format of 24Mbps.
- the first value may be 36us, where 36us is the PPDU length when the QoS-Null frame is sent in the Non-HT PPDU format or Non-HT duplicate PPDU format of 24Mbps.
- the first value may be 68us, where 68us is the PPDU length when a BA frame with a bitmap length of 64 is sent in a 6Mbps Non-HT PPDU format or a Non-HT duplicate PPDU format.
- the above-mentioned first value may also be determined by the access point (or AP MLD) and sent to the station (that is, the non-AP MLD).
- the channel access method for a multi-link device in this embodiment of the present application may further include: step S202, the second multi-link device sends indication information, where the indication information is used to indicate the first value.
- the first multilink device receives the indication information.
- the indication information may be carried in a beacon (beacon) frame, and may also be carried in an association response frame or a reassociation response frame.
- the above-mentioned first multi-link device may be a non-STR MLD, specifically a non-AP MLD of a non-STR.
- the above-mentioned second multi-link device may be an STR MLD, specifically an AP MLD of an STR.
- the indication information may be located in a multi-link element (multi-link element).
- FIG. 6a is a schematic diagram of a frame structure of a multi-link element provided by an embodiment of the present application.
- the multi-link element may include an element ID (element ID) field, a length (length) field, an element ID extension (element ID extension) field, a multi-link control (multi-link control) field, a media Sync delay timer threshold (mediumSyncDelay timer threshold) field, optional subelement (optional subelements) field, etc.
- the media synchronization delay timing threshold field is used to indicate the first value.
- the indication information may be located in an EHT operation element.
- FIG. 6b is a schematic diagram of a frame structure of an EHT operation element provided by an embodiment of the present application.
- the EHT operation element may include an element ID (element ID) field, a length (length) field, an element ID extension (element ID extension) field, and a media synchronization delay timer threshold (mediumSyncDelay Timer Threshold) field, etc. .
- the media synchronization delay timing threshold field is used to indicate the first value.
- a new information unit may also be defined to carry the indication information.
- This new information element is used to carry the configuration parameters of the non-STR MLD.
- the new information element may be referred to as a non-STR MLD parameter set element. It is understandable that the new information unit may have other names, which are not limited in this embodiment of the present application.
- FIG. 6c is a schematic diagram of a frame structure of a non-STR MLD parameter set element provided by an embodiment of the present application.
- the non-STR MLD parameter set element may include an element ID (element ID) field, a length (length) field, an element ID extension (element ID extension) field, and a media synchronization delay timer threshold (mediumSyncDelay timer). threshold) field, etc.
- the media synchronization delay timing threshold field is used to indicate the first value.
- the first multi-link device may start a media synchronization delay timer on the second link.
- the first multi-link device may use a more conservative channel access mechanism on the second link.
- the more conservative signal access mechanism includes but is not limited to: 1) Using a lower energy detection threshold (here refers to an ED threshold lower than -62dBm) to determine whether the channel is busy. 2) RTS frames must be sent to test channel availability.
- the number of trials (or the number of times of sending an RTS frame) can only be one, or a limited number of times.
- the operation of the first multi-link device may either not start the media synchronization delay timer on the second link;
- the media synchronization delay timer is started on the road, and the embodiment of the present application may set the operation of the first multi-link device when the length of the first PPDU is equal to the first value according to the actual situation.
- the first multi-link device may determine the initial value of the media synchronization delay timer corresponding to the length of the first PPDU. value, and then start the media synchronization delay timer on the second link. It is understandable that the initial value of the media synchronization delay timer started by the first multi-link device on the second link is the initial value corresponding to the determined length of the first PPDU.
- the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer may be specified in the standard protocol.
- the second multi-link device before the first multi-link device sends the first PPDU on the first link, the second multi-link device sends the first indication information, and accordingly, the first multi-link device receives the first indication information, and the first multi-link device sends the first indication information.
- An indication message is used to indicate the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer.
- the first multi-link device determines the energy detection threshold corresponding to the length of the first PPDU, and performs a When channel contention is performed on the second link, the energy detection threshold used in the CCA operation is set to the threshold value corresponding to the length of the first PPDU.
- the mapping relationship between the length of the PPDU and the energy detection threshold may be specified in the standard protocol. Or, before the first multi-link device sends the first PPDU on the first link, the second multi-link device sends the second indication information, and accordingly, the first multi-link device receives the second indication information, and the first multi-link device sends the second indication information.
- the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold.
- the above-mentioned first indication information and the above-mentioned second indication information may be one indication information, that is, one indication information simultaneously indicates the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer, and the mapping relationship between PPDU length and energy detection threshold.
- the above-mentioned first indication information and the above-mentioned second indication information are carried in one frame.
- the CCA adopts The energy detection threshold is set to -62dBm, or RTS frames are not required to be used for channel protection/channel availability testing on another link, thereby improving the channel access efficiency or channel access efficiency of non-STR MLD on another link. increase the access success rate, or improve the channel access opportunity of the non-STR MLD on another link.
- the above-mentioned "length of the first PPDU” can be replaced with "the length of a medium access control (medium access control, MAC) frame in the first PPDU (unit is bytes or bits)".
- the above step S301 can be replaced with: when the length of the MAC frame in the first PPDU sent by the first multi-link device on the first link is less than or equal to the second value, the first multi-link device is in the second The media synchronization delay timer is not enabled on the link, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the channel access methods provided in the first embodiment and the second embodiment can also be applied to a scenario of a single link and multiple access channels. Taking two channels as an example, it is assumed that the AP can use two channels for channel access, but can only complete access on one of the channels at a time, and cannot access two channels at the same time. Specifically, the AP performs channel contention on a primary channel such as the first channel. When the primary channel is busy, the AP can switch to another channel (such as the second channel) for channel contention, and use the second channel for channel contention. After backoff to 0, transmission is performed on this second channel.
- a primary channel such as the first channel.
- the AP can switch to another channel (such as the second channel) for channel contention, and use the second channel for channel contention. After backoff to 0, transmission is performed on this second channel.
- the embodiment of the present application proposes: when the AP sends a short frame (for example, an RTS frame, a CTS frame, a block acknowledgement (BA) frame, a BSR frame on the second channel frame, BQR frame, PS-Poll frame, NDP frame, etc.), the AP does not start a timer on the first channel.
- the timer may be a media synchronization delay timer.
- the embodiment of the present application further proposes: the AP sends the first PPDU on the second channel; when the PPDU length of the first PPDU is less than or equal to the first value, the AP does not enable media synchronization on the first channel Delay timer.
- the fact that the AP does not start the timer on the first channel can be understood as (which can be described as): when the AP performs channel competition on the first channel, the energy detection threshold used by the CCA operation is the first threshold; or, the AP After backing off to 0 on the first channel, it is allowed to directly send other frames except RTS and MU-RTS frames. In other words, the AP does not send RTS/MU-RTS frames after backing off to 0 on the first channel.
- the first threshold may be -62dBm.
- the second channel in this embodiment of the present application is equivalent to the first link in the foregoing first and second embodiments, and the first channel in this embodiment of the present application is equivalent to the foregoing first and second embodiments. the second link.
- the channel access method provided in the embodiments of the present application can also be applied to the scenarios of single link and multiple access channels, which expands the scenarios of the method and can also improve the channel access efficiency or channel access efficiency of the AP on the first channel. Access success rate.
- the third embodiment of the present application provides a method for determining the initial duration of a media synchronization delay timer.
- the initial duration of the media synchronization delay timer is determined by the length of the frame sent on the first link (or the second channel).
- FIG. 7 is a schematic flowchart of a method for determining an initial duration of a media synchronization delay timer provided by an embodiment of the present application. As shown in FIG. 7 , the method for determining the initial duration of the media synchronization delay timer includes but is not limited to the following steps:
- the second multilink device sends first indication information, where the first indication information is used to indicate the mapping relationship between the length of the PPDU/byte length and the initial value (or initial duration) of the media synchronization delay timer.
- the second multi-link device may be an AP MLD, and the AP MLD has the STR capability.
- the link through which the AP MLD sends the first indication information may be the first link or another link, which is not limited in this embodiment of the present application.
- the above-mentioned first indication information may be used to indicate the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer.
- FIG. 8 is a schematic diagram of a mapping relationship between a PPDU length and an initial value of a media synchronization delay timer provided by an embodiment of the present application.
- the length of the PPDU is in the range of 0 to 100us (microseconds) (ie interval [0,100us], or interval (0,100us), or interval (0,100us], or interval [0,100us))
- the media The initial value of the synchronization delay timer is 0ms.
- the media synchronization delay timer When the length of the PPDU is in the range of 100us to 1ms (that is, the interval [100us, 1000us], or the interval (100us, 1000us), or the interval (100us, 1000us], or the interval [100us, 1000us)), the media synchronization delay timer The initial value is 3ms. When the length of the PPDU is greater than or equal to 1ms, the initial value of the media synchronization delay timer is 6ms.
- mapping relationship shown in FIG. 8 can be summarized as shown in Table 1 below.
- mapping relationships shown in FIG. 8 and Table 1 are only examples, and in practical applications, the mapping relationships may be determined according to actual application scenarios.
- the initial value of the media synchronization delay timer is 0ms; when the length of the PPDU is greater than or equal to 50us and less than or equal to 200us, the initial value of the media synchronization delay timer is 1ms;
- the initial value of the media synchronization delay timer is 3ms; when the PPDU length is greater than or equal to 500us, the initial value of the media synchronization delay timer is 5ms. This embodiment of the present application does not limit this.
- the foregoing first indication information may include an array.
- the array (0,100,0) indicates that when the length of the PPDU is in the range of 0 to 100us, the initial value of the media synchronization delay timer is 0ms; the array (100,1000,3) indicates that the length of the PPDU is in the range of 100us to 1ms. , the initial value of the media synchronization delay timer is 3ms; array (1000, maximum PPDU length, 6), indicating that when the PPDU length is within the range of 1ms to the maximum PPDU length, the initial value of the media synchronization delay timer is 6ms.
- the maximum PPDU length is specified by the standard protocol.
- the above-mentioned first indication information may include two fields, the first field is used to determine N intervals, and the second field is used to indicate the media synchronization delay timer corresponding to each interval in the N intervals. initial value.
- the first field may include N+1 subfields, the values of the N+1 subfields increase monotonically, and the values of two adjacent subfields may determine an interval, so N+1 subfields may determine N an interval.
- the value of the first subfield is 0; the value of the N+1th subfield is the maximum PPDU length, or a value larger than the maximum PPDU length, such as 6ms.
- the first subfield (or the N+1th subfield) may not be carried in the first field.
- the second field includes N subfields, and the value of one subfield represents the initial value of the media synchronization delay timer corresponding to one interval.
- the first multilink device receives the first indication information.
- the first multi-link device determines, according to the length of the first PPDU sent on the first link, an initial value of the media synchronization delay timer corresponding to the length of the first PPDU, where the initial value is used to determine the second Whether the media synchronization delay timer is enabled on the link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the first multi-link device may be a non-AP MLD, and the non-AP MLD has a non-STR capability.
- the first multilink device may determine the first multilink device according to the mapping relationship between the PPDU length indicated by the first indication information and the initial value (or initial duration) of the media synchronization delay timer, and the PPDU length of the first PPDU.
- the initial value (or initial duration) of the media synchronization delay timer corresponding to the PPDU length of a PPDU.
- the mapping relationship is shown in Table 1 above. Assuming that the length of the first PPDU is 200us, the initial value (or initial duration) of the media synchronization delay timer is 3ms.
- the first multi-link device determines whether to enable the media synchronization delay timer on the second link according to the initial value (or initial duration) of the media synchronization delay timer corresponding to the length of the first PPDU. device.
- the first multi-link device does not start the media synchronization delay timer on the second link. If the initial value (or initial duration) of the media synchronization delay timer is greater than 0, the first multi-link device starts the media synchronization delay timer on the second link, and the initial value of the media synchronization delay timer is The value/initial duration is the value determined in the above step S404.
- the first multi-link device when the first multi-link device starts the mediumSyncDelay timer on the second link, it can be understood (or can be described as): during the period of time counted by the mediumSyncDelay timer, the first multi-link device can start the mediumSyncDelay timer on the second link.
- a more conservative channel access mechanism is used on the link.
- a more conservative signal access mechanism includes but is not limited to: 1) Using a lower energy detection threshold (here refers to an ED threshold lower than -62dBm) to determine whether the channel is busy. 2) RTS frames must be sent to test channel availability.
- the number of trials (or the number of times of sending an RTS frame) can only be one, or a limited number of times.
- the first multi-link device does not start the mediumSyncDelay timer on the second link, which can be understood as (or can be described as): when the first multi-link device performs channel contention on the second link, the CCA operation adopts the
- the energy detection threshold is the first threshold; or, after the first multi-link device backs off to 0 on the second link, it is allowed to directly send other frames except the RTS and MU-RTS frames.
- the first threshold may be -62dBm.
- the method for determining the initial duration of the media synchronization delay timer may also be applied to a scenario of a single link and multiple access channels.
- the first channel in the scenario of single link and multiple access channels is equivalent to the above-mentioned second link
- the second channel in the scenario of single link and multiple access channels is equivalent to the above-mentioned first link, It will not be repeated here.
- the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer, so that the first multi-link device can make the first multi-link device according to this mapping relationship and the first
- the length of the first PPDU sent on a link determines the initial value of the media synchronization delay timer corresponding to the length of the first PPDU, and when the initial value is equal to 0, the mediumSyncDelay timer is not started on the second link , when the initial value is greater than 0, start the mediumSyncDelay timer on the second link.
- Different PPDU lengths correspond to different initial values of the mediumSyncDelay timer, which makes the setting of the mediumSyncDelay timer more flexible and can improve the channel access efficiency.
- the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer may be specified in a standard protocol.
- the method for determining the initial duration of the media synchronization delay timer shown in FIG. 7 may not include steps S301 and S302. That is, the method for determining the initial duration of the media synchronization delay timer may include step S303.
- Embodiment 4 of the present application provides a method for determining an energy detection threshold in a CCA process.
- the method for determining the energy detection threshold in the CCA process determines the ED threshold used in the CCA process when backoff is performed on the second link during the mediumSyncDelay period by the length of the frame sent on the first link (or the second channel). the size of.
- FIG. 9 is a schematic flowchart of a method for determining an energy detection threshold in a CCA process provided by an embodiment of the present application. As shown in Figure 9, the method for determining the energy detection threshold in the CCA process includes but is not limited to the following steps:
- the second multi-link device sends second indication information, where the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold.
- the second multi-link device may be an AP MLD, and the AP MLD has the STR capability.
- the link through which the AP MLD sends the second indication information may be the first link or another link, which is not limited in this embodiment of the present application.
- the above-mentioned second indication information may be used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold.
- FIG. 10 is a schematic diagram of a mapping relationship between a PPDU length and an energy detection threshold provided by an embodiment of the present application.
- the energy The detection threshold is -62dBm.
- the energy detection threshold is -72dBm.
- the energy detection threshold is -82dBm.
- mapping relationship shown in FIG. 10 can be summarized as shown in Table 2 below.
- mapping relationships shown in FIG. 10 and Table 2 are only examples, and in practical applications, the mapping relationships may be determined according to actual application scenarios.
- the energy detection threshold is -62dBm
- the energy detection threshold is -67dBm
- the PPDU length is greater than or equal to 200us and less than or equal to At 500us
- the energy detection threshold is -72dBm
- the energy detection threshold is -82dBm. This embodiment of the present application does not limit this.
- the foregoing second indication information may include an array.
- the array (0,100,-62) indicates that when the PPDU length is in the range of 0 to 100us, the energy detection threshold is -62dBm;
- the array (100,1000,-72) indicates that when the PPDU length is in the range of 100us to 1ms, the energy detection threshold is -62dBm;
- the detection threshold is -72dBm;
- the array (1000, the maximum PPDU length, -82) indicates that when the PPDU length is within the range of 1ms to the maximum PPDU length, the energy detection threshold is -62dBm.
- the maximum PPDU length is specified by the standard protocol.
- the above-mentioned second indication information may include two fields, the first field is used to determine N intervals, and the second field is used to indicate the energy detection threshold corresponding to each interval in the N intervals.
- the first field may include N+1 subfields, the values of the N+1 subfields increase monotonically, and the values of two adjacent subfields may determine an interval, so N+1 subfields may determine N an interval.
- the value of the first subfield is 0; the value of the N+1th subfield is the maximum PPDU length, or a value larger than the maximum PPDU length, such as 6ms.
- the first subfield (or the N+1th subfield) may not be carried in the first field.
- the second field includes N subfields, and the value of one subfield represents an energy detection threshold corresponding to an interval.
- the first multilink device receives the second indication information.
- the first multi-link device determines, according to the length of the first PPDU sent on the first link, an energy detection threshold corresponding to the length of the first PPDU, where the energy detection threshold is used to determine whether the first PPDU is sent on the second link. Start the media synchronization delay timer.
- the first multi-link device may be a non-AP MLD, and the non-AP MLD has a non-STR capability.
- the first multilink device may determine the energy detection threshold corresponding to the length of the first PPDU according to the mapping relationship between the length of the PPDU indicated by the second indication information and the energy detection threshold and the length of the first PPDU. For example, the mapping relationship is shown in Table 2 above. Assuming that the length of the first PPDU is 200us, the energy detection threshold is -72dBm.
- the first multi-link device determines whether to start the media synchronization delay timer on the second link according to an energy detection threshold corresponding to the length of the first PPDU. Specifically, if the energy detection threshold determined in the above step S403 is equal to -62dBm, the first multi-link device does not start the media synchronization delay timer on the second link. If the energy detection threshold determined in the above step S403 is less than -62dBm, the first multi-link device starts the media synchronization delay timer on the second link.
- the energy detection threshold used by the CCA is set to the energy detection threshold corresponding to the length of the first PPDU (that is, the energy detection threshold determined in step S504 above).
- the first multi-link device starts the mediumSyncDelay timer on the second link, which can be understood (or can be described as): during the mediumSyncDelay period, the first multi-link device can use a more conservative method on the second link.
- channel access mechanism includes but is not limited to: 1) Using a lower energy detection threshold (here refers to an ED threshold lower than -62dBm) to determine whether the channel is busy. 2) RTS frames must be sent to test channel availability.
- the number of trials (or the number of times of sending an RTS frame) can only be one, or a limited number of times.
- the first multi-link device does not start the mediumSyncDelay timer on the second link, which can be understood as (or can be described as): when the first multi-link device performs channel contention on the second link, the CCA operation adopts the
- the energy detection threshold is the first threshold; or, after the first multi-link device backs off to 0 on the second link, it is allowed to directly send other frames except the RTS and MU-RTS frames.
- the first threshold may be -62dBm.
- the method for determining the energy detection threshold in the CCA process can also be applied to a scenario of a single link and multiple access channels.
- the first channel in the scenario of single link and multiple access channels is equivalent to the above-mentioned second link
- the second channel in the scenario of single link and multiple access channels is equivalent to the above-mentioned first link
- the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold, so that the first multi-link device sends the length of the first PPDU on the first link according to the mapping relationship and the first link. , determine the energy detection threshold corresponding to the length of the first PPDU, and when the energy detection threshold is equal to -62dBm, do not start the mediumSyncDelay timer on the second link, when the energy detection threshold is less than -62dBm, on the second link Start the mediumSyncDelay timer.
- Different PPDU lengths correspond to different energy detection thresholds, so that the channel access mechanism on the second link is more flexible, and the channel access efficiency can be improved.
- the mapping relationship between the PPDU length and the energy detection threshold may be specified in a standard protocol.
- the method for determining the energy detection threshold in the CCA process shown in FIG. 9 may not include steps S401 and S402. That is, the method for determining the energy detection threshold in the CCA process may include step S403.
- the first indication information in the foregoing Embodiment 3 and the second indication information in the foregoing Embodiment 4 may be the same indication information, or the first indication information and the second indication information are carried in the same frame. Therefore, the foregoing third embodiment and the foregoing fourth embodiment may be combined into one embodiment.
- the second multi-link device sends indication information, the indication information is used to indicate the mapping relationship between the PPDU length and the initial value (or initial duration) of the media synchronization delay timer, and the relationship between the PPDU length and the energy detection threshold
- the first multi-link device receives the indication information; the first multi-link device sends the first PPDU on the first link; the first multi-link device determines the first PPDU according to the length of the first PPDU The initial value of the media synchronization delay timer corresponding to the length of a PPDU, and the energy detection threshold corresponding to the length of the first PPDU.
- the first multi-link device may also determine whether to use the second link according to the energy detection threshold corresponding to the length of the first PPDU or the initial value of the media synchronization delay timer corresponding to the length of the first PPDU. Whether to enable the media synchronization delay timer on the road.
- the communication device may be divided into functional modules according to the foregoing method examples.
- 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. 11 is a schematic structural diagram of a first multi-link device provided by an embodiment of the present application.
- the first multi-link device includes: a transceiver unit 11 and a processing unit 12 .
- the processing unit 12 is configured to, when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value, when media synchronization is not enabled on the second link delay timer, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the above-mentioned processing unit 12 is specifically configured to set the energy detection threshold used in the CCA operation as the first threshold when performing channel competition on the second link.
- the above-mentioned transceiver unit 11 is configured to send frames other than RTS and MU-RTS frames after backing off to 0 on the second link.
- the first threshold may be -62dBm.
- first multi-link device in this design can correspondingly execute the foregoing second embodiment, and the above-mentioned operations or functions of each unit in the first multi-link device are respectively for realizing the first multi-link in the foregoing second embodiment. Corresponding operations of the link device are not repeated here for brevity.
- the processing unit 12 is configured to, when the type of the first frame sent by the first multi-link device on the first link is the first type, the first multi-link device does not The media synchronization delay timer is started, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the above-mentioned processing unit 12 is specifically configured to set the energy detection threshold used in the CCA operation as the first threshold when performing channel competition on the second link.
- the above-mentioned transceiver unit 11 is further configured to send frames other than RTS and MU-RTS frames after backing off to 0 on the second link.
- the first threshold may be -62dBm.
- first multi-link device in this design can correspondingly execute the foregoing first embodiment, and the above-mentioned operations or functions of each unit in the first multi-link device are respectively for realizing the first multi-link in the foregoing embodiment 1. Corresponding operations of the link device are not repeated here for brevity.
- the transceiver unit 11 is used to receive first indication information, where the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value of the media synchronization delay timer; the processing unit 12 is used to The length of the first PPDU sent on the first link, to determine the initial value of the media synchronization delay timer corresponding to the length of the first PPDU, and the initial value is used to determine whether to enable the media synchronization on the second link Delay timer.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the processing unit 12 is further configured to determine whether to enable the media synchronization delay timer on the second link according to the initial value of the media synchronization delay timer corresponding to the length of the first PPDU.
- the above processing unit 12 is specifically configured to: if the determined initial value of the media synchronization delay timer is equal to 0, do not start the media synchronization delay timer on the second link; if the determined initial value of the media synchronization delay timer is equal to 0 If the initial value of the media synchronization delay timer is equal to 0, the media synchronization delay timer is started on the second link.
- first multi-link device in this design can correspondingly execute the foregoing third embodiment, and the above-mentioned operations or functions of each unit in the first multi-link device are respectively for realizing the first multi-link in the foregoing third embodiment. Corresponding operations of the link device are not repeated here for brevity.
- the transceiver unit 11 is used to receive second indication information, the second indication information is used to indicate the mapping relationship between the length of the PPDU and the energy detection threshold; the processing unit 12 is used to transmit according to the first link.
- the length of the first PPDU is determined, and the initial value of the media synchronization delay timer corresponding to the length of the first PPDU is determined.
- the communication device cannot transmit and receive simultaneously on the first link and the second link.
- the above processing unit 12 is further configured to determine whether to enable the media synchronization delay timer on the second link according to the energy detection threshold corresponding to the length of the first PPDU.
- the above-mentioned processing unit 12 is specifically configured to: if the determined energy detection threshold is equal to -62dBm, the first multi-link device does not start the media synchronization delay timer on the second link; The energy detection threshold is less than -62dBm, then the first multi-link device starts the media synchronization delay timer on the second link.
- first multi-link device in this design can correspondingly execute the foregoing fourth embodiment, and the above operations or functions of each unit in the first multi-link device are respectively to implement the first multi-link in the foregoing fourth embodiment. Corresponding operations of the link device are not repeated here for brevity.
- FIG. 12 is a schematic structural diagram of a second multi-link device provided by an embodiment of the present application.
- the second multi-link device includes: a processing unit 21 and a transceiver unit 22 .
- the processing unit 21 is used to generate first indication information, where the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value (or initial duration) of the media synchronization delay timer; the transceiver unit 22, for sending the first indication information.
- the second multi-link device in this design can correspondingly execute the foregoing third embodiment, and the above-mentioned operations or functions of each unit in the second multi-link device are to implement the second multi-link device in the foregoing third embodiment, respectively. Corresponding operations of the link device are not repeated here for brevity.
- the processing unit 21 is used to generate second indication information, where the second indication information is used to indicate the mapping relationship between the PPDU length and the energy detection threshold; the transceiver unit 22 is used to send the second indication information .
- the second multi-link device in this design can correspondingly execute the foregoing Embodiment 4, and the above operations or functions of each unit in the second multi-link device are to implement the second multi-link device in the foregoing Embodiment 4 respectively. Corresponding operations of the link device are not repeated here for brevity.
- the first multi-link device and the second multi-link device according to the embodiments of the present application have been described above, and possible product forms of the first and second multi-link devices are described below. It should be understood that any product that has the function of the first multi-link device described in FIG. 11 and any product that has the function of the second multi-link device described in FIG. 12 falls into the category. The protection scope of the embodiments of the present application. It should also be understood that the following description is only an example, and the product forms of the first multi-link device and the second multi-link device in the embodiments of the present application are not limited thereto.
- the first multi-link device and the second multi-link device described in the embodiments of the present application may be implemented by a general bus architecture.
- a first multilink device includes a processor and a transceiver in interconnected communication with the processor.
- the processor is configured to disable media synchronization delay timing on the second link when the length of the first PPDU sent by the first multi-link device on the first link is less than or equal to the first value.
- a device wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is configured to send the first PPDU on the first link;
- the processor is configured to not start the media synchronization delay timer on the second link when the type of the first frame sent by the first multi-link device on the first link is the first type, The first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive first indication information, and the first indication information is used to indicate the mapping relationship between the length of the PPDU and the initial value of the media synchronization delay timer; the processor is used to The length of the first PPDU sent on the second link determines the initial value of the media synchronization delay timer corresponding to the length of the first PPDU, and the initial value is used to determine whether to enable the media synchronization delay timer on the second link. .
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive second indication information, and the second indication information is used to indicate the mapping relationship between the PPDU length/byte length and the energy detection threshold;
- the length of the first PPDU is determined, and the initial value of the media synchronization delay timer corresponding to the length of the first PPDU is determined.
- the communication device cannot transmit and receive simultaneously on the first link and the second link.
- a second multilink device includes a processor and a transceiver in interconnected communication with the processor.
- the processor is used to generate first indication information, and the first indication information is used to indicate the mapping relationship between the PPDU length and the initial value (or initial duration) of the media synchronization delay timer; the transceiver is used for Send the first indication information.
- the processor is configured to generate second indication information, where the second indication information is used to indicate the mapping relationship between the PPDU length and the energy detection threshold; the transceiver is used to send the second indication information.
- the first multi-link device and the second multi-link device described in the embodiments of the present application may be implemented by chips.
- the chip implementing the first multi-link device includes a processing circuit and an input and output interface that is internally connected and communicated with the processing circuit.
- the I/O interface is used to receive code instructions and transmit them to the processing circuit, and the processing circuit is used to disable media synchronization on the second link when the length of the first PPDU is less than or equal to the first value A delay timer, wherein the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the input and output interface is used to receive code instructions and transmit them to the processing circuit, and the processing circuit is used for when the type of the first frame sent by the first multi-link device on the first link is the first type When the first multi-link device does not start the media synchronization delay timer on the second link, the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive the first indication information
- the input and output interface is used to receive the first indication information from the transceiver, and send the first indication information to the processing circuit for processing to obtain the first indication
- the mapping relationship between the length of the PPDU indicated by the information and the initial value (or initial duration) of the media synchronization delay timer; the processing circuit is used to determine the first PPDU according to the length of the first PPDU sent on the first link
- the initial value of the media synchronization delay timer corresponding to the length of , where the initial value is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the transceiver is used to receive the second indication information
- the input and output interface is used to receive the second indication information from the transceiver, and send the second indication information to the processing circuit for processing to obtain the second indication
- the mapping relationship between the length of the PPDU indicated by the information and the energy detection threshold; the processing circuit is used to determine the energy detection threshold corresponding to the length of the first PPDU according to the length of the first PPDU sent on the first link.
- the detection threshold is used to determine whether to start the media synchronization delay timer on the second link.
- the first multi-link device cannot transmit and receive simultaneously on the first link and the second link.
- the chip implementing the second multi-link device includes a processing circuit and an input and output interface that is internally connected and communicated with the processing circuit.
- the input and output interface is used to receive code instructions and transmit them to the processing circuit, and the processing circuit is used to generate first indication information, and the first indication information is used to indicate the length of the PPDU and the media synchronization delay timer.
- the input and output interface is used to receive code instructions and transmit them to the processing circuit, and the processing circuit is used to generate second indication information, where the second indication information is used to indicate the difference between the length of the PPDU and the energy detection threshold.
- a mapping relationship the input and output interface is used for sending the second indication information to the transceiver, and the transceiver is used for sending the second indication information.
- the first multi-link device and the second multi-link device described in the embodiments of the present application may also be implemented using the following: one or more FPGAs (Field Programmable Gate Arrays), A PLD (Programmable Logic Device), controller, state machine, gate logic, discrete hardware components, any other suitable circuit, or any combination of circuits capable of performing the various functions described throughout this application.
- FPGAs Field Programmable Gate Arrays
- PLD Programmable Logic Device
- controller state machine
- gate logic discrete hardware components
- discrete hardware components any other suitable circuit, or any combination of circuits capable of performing the various functions described throughout this application.
- Embodiments of the present application further provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer can execute the method in any of the foregoing embodiments.
- Embodiments of the present application also provide a computer program product, which, when the computer program product runs on a computer, causes the computer to execute the method in any of the foregoing embodiments.
- An embodiment of the present application further provides a communication device, which can exist in the form of a chip, and the structure of the device includes a processor and an interface circuit, and the processor is used to communicate with other devices through a receiving circuit, so that the device performs the above-mentioned The method of any of the embodiments.
- the steps of the methods or algorithms described in conjunction with the disclosure of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions.
- the software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (Random Access Memory, RAM), flash memory, Erasable Programmable Read-Only Memory (Erasable Programmable ROM, EPROM), electrically erasable programmable Programmable read-only memory (Electrically EPROM, EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM), or any other form of storage medium known in the art.
- An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium.
- the storage medium can also be an integral part of the processor.
- the processor and storage medium may reside in an ASIC.
- the ASIC may be located in the core network interface device.
- the processor and the storage medium may also exist in the core network interface device as discrete components.
- the functions described in this application may be implemented in hardware, software, firmware, or any combination thereof.
- the functions When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
- Computer-readable media includes both computer-readable storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
- a storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.
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Abstract
Description
PPDU长度 | 媒体同步时延计时器的初始值(或初始时长) |
<=100us | 0 |
>=100us且<=1ms | 3ms |
>=1ms | 6ms |
PPDU时长 | 能量检测门限 |
<=100us | -62dBm |
>=100us且<=1ms | -72dBm |
>=1ms | -82dBm |
Claims (30)
- 一种多链路设备的信道接入方法,其特征在于,包括:当第一多链路设备在第一链路上发送的第一物理层协议数据单元PPDU的长度小于或等于第一值时,所述第一多链路设备在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种多链路设备的信道接入方法,其特征在于,包括:在第二链路上的媒体同步计时器已经开启的情况下,如果第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值,则所述第一多链路设备不更新所述第二链路上的媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 根据权利要求1所述的方法,其特征在于,所述第一多链路设备在第二链路上不开启媒体同步时延计时器包括:将第二链路上的空闲信道评估CCA所采用的能量检测门限设置为第一门限,所述第一门限为-62dBm;或者,所述第一多链路设备在所述第二链路上的退避计数器退避到0后,发送除RTS帧和MU-RTS帧之外的其他帧。
- 根据权利要求1-3任一项所述的方法,其特征在于,所述方法还包括:所述第一多链路设备接收第一值,所述第一值携带在信标帧、或关联响应帧、或重关联响应帧中。
- 根据权利要求1-4任一项所述的方法,其特征在于,所述方法还包括:当所述第一PPDU的长度大于所述第一值时,所述第一多链路设备确定所述第一PPDU的长度对应的媒体同步时延计时器的初始值,并在所述第二链路上以所述初始值开启所述媒体同步时延计时器。
- 根据权利要求5所述的方法,其特征在于,所述方法还包括:第一多链路设备接收第一指示信息,所述第一指示信息用于指示PPDU长度与媒体同步时延计时器的初始值之间的映射关系。
- 根据权利要求1-6任一项所述的方法,其特征在于,所述方法还包括:当所述第一PPDU的长度大于所述第一值时,所述第一多链路设备在所述第二链路上开启所述媒体同步延时计时器;在所述媒体同步延时计时器计时的时间段内,若所述第一多链路设备在所述第二链路上进行信道竞争,则将所述第二链路上的CCA所采用的能量检测门限设置为所述第一PPDU的长度对应的门限值。
- 根据权利要求7所述的方法,其特征在于,所述第一多链路设备在第一链路上发送第 一PPDU之前,所述方法还包括:第一多链路设备接收第二指示信息,所述第二指示信息用于指示PPDU长度与能量检测门限之间的映射关系。
- 一种多链路设备的信道接入方法,其特征在于,包括:当第一多链路设备在第一链路上发送的第一帧的类型为第一类型时,所述第一多链路设备在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 根据权利要求9所述的方法,其特征在于,所述第一帧为以下任一帧时,所述第一帧的类型为第一类型:请求发送RTS帧、多用户请求发送MU-RTS帧、功率节省轮询PS-Poll帧、允许发送CTS帧、状态报告BSR帧、带宽查询报告BQR帧、空数据分组NDP帧、确认ACK帧、块确认BA帧。
- 根据权利要求9或10所述的方法,其特征在于,所述第一多链路设备在第二链路上不开启媒体同步时延计时器包括:将第二链路上的空闲信道评估CCA所采用的能量检测门限设置为第一门限,所述第一门限为-62dBm;或者,所述第一多链路设备在所述第二链路上的退避计数器退避到0后,发送除RTS帧和MU-RTS帧之外的其他帧。
- 一种第一多链路设备,其特征在于,包括:处理单元,用于当所述第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值时,在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括:处理单元,用于在第二链路上的媒体同步计时器已经开启的情况下,当第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值时,不更新所述第二链路上的媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 根据权利要求12所述的第一多链路设备,其特征在于,所述处理单元具体用于:将第二链路上的空闲信道评估CCA所采用的能量检测门限设置为第一门限,所述第一门限为-62dBm;或者,所述第一多链路设备还包括收发单元,所述收发单元,用于在所述第二链路上的退避计数器退避到0后,发送除RTS帧和MU-RTS帧之外的其他帧。
- 根据权利要求12-14中任一项所述的第一多链路设备,其特征在于,所述第一多链路设备还包括收发单元,所述收发单元,用于接收第一值,所述第一值携带在信标帧、或关联响应帧、或重关联响应帧中。
- 根据权利要求12-15任一项所述的第一多链路设备,其特征在于,所述处理单元还用于:当所述第一PPDU的长度大于所述第一值时,确定所述第一PPDU的长度对应的媒体同步时延计时器的初始值,并在所述第二链路上以所述初始值开启所述媒体同步时延计时器。
- 根据权利要求16所述的第一多链路设备,其特征在于,所述第一多链路设备还包括 收发单元,所述收发单元用于接收第一指示信息,所述第一指示信息用于指示PPDU长度与媒体同步时延计时器的初始值之间的映射关系。
- 根据权利要求12-17任一项所述的第一多链路设备,其特征在于,所述处理单元,还用于:当所述第一PPDU的长度大于所述第一值时,在所述第二链路上开启所述媒体同步延时计时器;在所述媒体同步延时计时器计时的时间段内,若所述通信装置在所述第二链路上进行信道竞争,则将所述第二链路上的CCA所采用的能量检测门限设置为所述第一PPDU的长度对应的门限值。
- 根据权利要求18所述的第一多链路设备,其特征在于,所述第一多链路设备还包括收发单元,所述收发单元,用于接收第二指示信息,所述第二指示信息用于指示PPDU长度与能量检测门限之间的映射关系。
- 一种第一多链路设备,其特征在于,包括:处理单元,用于当所述第一多链路设备在第一链路上发送的第一帧的类型为第一类型时,所述第一多链路设备在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 根据权利要求20所述的第一多链路设备,其特征在于,所述第一帧为以下任一帧时,所述第一帧的类型为第一类型:请求发送RTS、多用户请求发送帧MU-RTS、功率节省轮询PS-Poll帧、CTS帧、状态报告BSR帧、带宽查询报告BQR帧、空数据分组NDP帧、确认ACK帧、块确认BA帧。
- 根据权利要求20或21所述的第一多链路设备,其特征在于,所述处理单元具体用于将第二链路上的空闲信道评估CCA所采用的能量检测门限设置为第一门限,所述第一门限为-62dBm;或者,所述第一多链路设备还包括收发单元,所述收发单元,用于在所述第二链路上的退避计数器退避到0后,发送除RTS帧和MU-RTS帧之外的其他帧。
- 一种第一多链路设备,其特征在于,包括处理器,所述处理器用于当所述第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值时,在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括处理器,所述处理器用于当所述第一多链路设备在第一链路上发送的第一帧的类型为第一类型时,所述第一多链路设备在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括处理器,所述处理器用于在第二链路上的媒体同步计时器已经开启的情况下,当第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值时,不更新所述第二链路上的媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括输入输出接口和处理电路,所述输入输出接口用于接收代码指令并传输至所述处理电路,所述处理电路用于当第一PPDU的长度小于或等于第一值时,在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括输入输出接口和处理电路,所述输入输出接口用于接收代码指令并传输至所述处理电路,所述处理电路用于当所述第一多链路设备在第一链路上发送的第一帧的类型为第一类型时,在第二链路上不开启媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种第一多链路设备,其特征在于,包括输入输出接口和处理电路,所述输入输出接口用于接收代码指令并传输至所述处理电路,所述处理电路用于在第二链路上的媒体同步计时器已经开启的情况下,当第一多链路设备在第一链路上发送的第一PPDU的长度小于或等于第一值时,不更新所述第二链路上的媒体同步时延计时器,其中所述第一多链路设备在所述第一链路和所述第二链路上不能同时收发。
- 一种计算机可读存储介质,所述计算机可读存储介质中存储有程序指令,当所述程序指令在计算机上运行时,使得所述计算机执行如权利要求1-11任一项所述的方法。
- 一种包含程序指令的计算机程序产品,当所述程序指令在计算机上运行时,使得所述计算机执行如权利要求1-11任一项所述的方法。
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WO2024043694A1 (ko) * | 2022-08-24 | 2024-02-29 | 현대자동차주식회사 | Mlsr 동작을 지원하는 무선랜에서 저전력 동작을 위한 방법 및 장치 |
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US10135651B2 (en) * | 2015-06-24 | 2018-11-20 | Newracom, Inc. | Enhanced clear channel assessment |
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CN114143900A (zh) | 2022-03-04 |
JP2023540326A (ja) | 2023-09-22 |
CN116508394A (zh) | 2023-07-28 |
AU2021336597B2 (en) | 2024-08-22 |
CN116390264A (zh) | 2023-07-04 |
JP7524468B2 (ja) | 2024-07-29 |
MX2023002630A (es) | 2023-06-08 |
EP4195857A4 (en) | 2024-01-17 |
AU2021336597A1 (en) | 2023-04-13 |
US20230209600A1 (en) | 2023-06-29 |
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EP4195857A1 (en) | 2023-06-14 |
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