WO2023036050A1

WO2023036050A1 - Communication method and apparatus

Info

Publication number: WO2023036050A1
Application number: PCT/CN2022/116586
Authority: WO
Inventors: 杨博; 陈鹏; 季晨荷; 胡寅亮
Original assignee: 华为技术有限公司
Priority date: 2021-09-08
Filing date: 2022-09-01
Publication date: 2023-03-16
Also published as: CN115801918A

Abstract

The present application relates to the field of communications, and discloses a communication method and an apparatus, which may ensure that the timing of a receiving end meets SIFS timing requirements. The communication method comprises: receiving a first PPDU; and parsing a frame header of the first PPDU, wherein the frame header comprises a first field, and the first field is used to indicate to feed back an immediate response frame. In other words, when parsing the frame header of the first PPDU, the receiving end may determine according to the indication of the first field in the frame header of the first PPDU that the immediate response frame needs to be fed back, so that the receiving end avoids only being able to determine whether the immediate response frame needs to be fed back after a MAC layer completes the parsing of an MPDU of the first PPDU,. That is to say, in the present application, it can be determined in advance that the immediate response frame needs to be fed back, so that the receiving processing of the receiving end can be more flexible, thus ensuring that the timing of the receiving end meets the SIFS timing requirements.

Description

A communication method and device

This application claims the priority of the Chinese patent application with the application number 202111052078.4 and the application name "A Communication Method and Device" submitted to the State Intellectual Property Office on September 08, 2021, the entire contents of which are incorporated in this application by reference .

technical field

The present application relates to the communication field, and in particular to a communication method and device.

Background technique

In the current wireless local area network (wireless local area network, WLAN) standard, the timing of the receiving end needs to meet the short interframe space (short interframe space, SIFS) timing requirement. The sending end sends a data frame to the receiving end. If the data frame is successfully received by the receiving end, and the sending end requests the receiving end to feed back a response frame for the data frame, then the receiving end needs to feed back a response frame to the sending end at the end of the SIFS time.

In SIFS, the receiving end needs to send and receive data frames from the sending end. Wherein, the sending and receiving process at the receiving end may include the following operations: receiving data at a physical layer (PHY), processing data at a PHY, processing data at a media access control (MAC) layer, sending data at a PHY, and converting between sending and receiving.

With the increase of the code length of the physical layer and the increase of the technical complexity of WLAN, it becomes more and more difficult for the timing of the receiving end to meet the SIFS timing requirements. How to ensure that the timing at the receiving end satisfies the SIFS timing requirements has become a technical problem that needs to be solved urgently.

Contents of the invention

The present application provides a communication method and device, which can ensure that the timing of the receiving end meets the requirement of SIFS timing.

In order to achieve the above object, the application adopts the following technical solutions:

In a first aspect, the present application provides a communication method, which can be applied to a receiving end, and the receiving end can be an access point (access point, AP) or a station (station, STA). The communication method includes: receiving a first physical layer protocol data unit (physical layer protocol data unit, PPDU); parsing the frame header of the first PPDU, the frame header includes a first field, and the first field is used to indicate that feedback is immediate frame.

Based on the communication method provided in the first aspect, when the receiving end parses the frame header of the first PPDU, it can determine that an immediate response frame needs to be fed back according to the indication of the first field in the frame header of the first PPDU, so that the receiving end avoids the MAC After the layer finishes parsing the MPDU of the first PPDU, it can determine whether to feed back an immediate response frame. That is to say, the present application can determine in advance that the immediate response frame needs to be fed back, so that the receiving process of the receiving end can be made more flexible, and the timing of the receiving end can be guaranteed to meet the SIFS timing requirement.

It should be noted that, in the embodiment of the present application, the immediate response frame (immediate response frame) may be called a response frame, or an immediate feedback frame, or an immediate response frame, etc., which is not limited in this application.

In some possible designs, after parsing the frame header of the first PPDU, the communication method described in the first aspect may further include: parsing a media access control (media access control, MAC) protocol data unit ( MAC protocol data unit, MPDU); Generate an immediate response frame according to the MPDU, and the immediate response frame is used to indicate the reception result of the MPDU.

In some possible designs, the immediate response frame may be carried in the second PPDU. Optionally, the second PPDU may also include L-STF and L-LTF. Among them, L-STF and L-LTF can be generated by the PHY of the receiving end according to the frame header of the first PPDU. The receiving and processing process of the PPDU is extended by at least 16 microseconds to ensure that the timing of the receiving end meets the SIFS timing requirements. Moreover, the processing timing requirements of the receiving end can be relaxed, so that the receiving processing of the receiving end is more flexible.

Further, the transmission bandwidth of the L-STF and the L-LTF may be indicated by a bandwidth field (bandwidth, BW) of the frame header of the first PPDU. In other words, when the receiving end sends the L-STF and L-LTF of the second PPDU, the sending bandwidth of the L-STF and L-LTF is the sending bandwidth indicated by the BW of the frame header of the first PPDU. In this way, when the receiving end parses the frame header of the first PPDU, it can obtain the transmission bandwidth of L-STF and L-LTF, and send L-STF and L-LTF according to the transmission bandwidth at the end of SIFS, which can ensure the reception The timing of the terminal meets the SIFS timing requirements.

Further, the sending power of the L-STF and the L-LTF may be determined by the receiving end, or the sending power of the L-STF and the L-LTF may be a default power, for example, the default power may be the maximum power. In this way, the receiving end can determine the transmission power of L-STF and L-LTF, and send L-STF and L-LTF according to the transmission power at the end of SIFS, which can ensure that the timing of the receiving end meets the timing requirements of SIFS and improve the efficiency of the receiving end Flexibility in sending L-STF and L-LTF.

In some possible designs, the immediate response frame may include any of the following: acknowledgment (ACKnowledgement, ACK) frame, block acknowledgment (block ACK, BA) frame, negative acknowledgment (negative acknowledgment, NACK) frame, null packet (null data packet, NDP) BA frame, BA target wake time (target wake time, TWT) TWT frame, TWT ACK frame, short (short) TWT ACK frame, quality of service (quality of service, QoS) contention-free, CF) ACK frame (QoS+CF-ACK frame). Wherein, the BA TWT frame can be referred to as the BAT frame for short, the TWT ACK frame can be referred to as the TACK for short, and the short TWT ACK frame can be referred to as the STACK frame for short.

In some possible designs, the immediate response frame may include a type field, a subtype field, and a control frame extension field.

In some possible designs, the first field is carried in any of the following: universal signaling field (universal SIG, U-SIG), extremely high throughput (extremely high throughput, EHT) signaling field (EHT signal field, EHT) -SIG) public field or EHT-SIG user field. In this way, the first field can be carried in the above field to indicate the receiving end to feed back the immediate response frame, so as to improve the utilization rate of signaling.

In some possible designs, after parsing the frame header of the first PPDU, the communication method described in the first aspect may further include: generating the second field in the second PPDU according to the first field in the frame header of the first PPDU , the second field includes L-STF and L-LTF; or, generate a second PPDU according to the first field in the frame header of the first PPDU, and the second PPDU includes the second field.

Optionally, the immediate response frame is carried in the second PPDU.

In the second aspect, the present application provides a communication method, which can be applied to a sending end, and the sending end can be an AP or a STA. The communication method includes: generating a first PPDU; a frame header of the first PPDU includes a first field, and the first field is used to indicate a feedback immediate response frame; and sending the first PPDU.

In some possible designs, the immediate response frame may be carried in the second PPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

Further, the transmission bandwidth of the L-STF and the L-LTF may be indicated by the BW of the frame header of the first PPDU.

Further, the sending power of the L-STF and the L-LTF may be determined by the receiving end, or the sending power of the L-STF and the L-LTF may be a default power, for example, the default power may be the maximum power.

In some possible designs, the immediate response frame may include any of the following: ACK frame, BA frame or NACK frame, NDP BA frame, BA TWT frame, TWT ACK frame, short TWT ACK frame, QoS+CF-ACK frame.

In some possible designs, an immediate response frame may include a type field, a subtype field, and a control frame extension field.

In some possible designs, the first field is carried by any one of the following: U-SIG, common field of EHT-SIG or user field of EHT-SIG.

In some possible designs, after sending the first PPDU, the communication method described in the second aspect may further include: receiving a second PPDU, the second PPDU includes a second field and a third field, and the second field includes an L-STF and L-LTF, the third field includes the immediate response frame.

Further, after sending the first PPDU, the communication method described in the second aspect may further include: determining a receiving result of the MPDU in the first PPDU according to the second PPDU.

It should be noted that, for the technical effect of the communication method described in the second aspect, reference may be made to the technical effect of the communication method described in the first aspect, which will not be repeated here.

In a third aspect, a communication device is provided. The communication device includes: a processing module and a transceiver module. Wherein, the transceiver module is configured to receive the first PPDU. The processing module is configured to parse the frame header of the first PPDU, where the frame header includes a first field, and the first field is used to indicate the feedback immediate response frame.

In some possible designs, the processing module is further configured to parse the MPDU in the first PPDU. The processing module is further configured to generate an immediate response frame according to the MPDU, and the immediate response frame is used to indicate a receiving result of the MPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the immediate response frame may include any of the following: ACK frame, BA frame, NACK frame, NDP BA frame, BA TWT frame, TWT ACK frame, short TWT ACK frame, QoS+CF-ACK frame.

In some possible designs, the processing module is further configured to generate the second field in the second PPDU according to the first field in the frame header of the first PPDU, where the second field includes L-STF and L-LTF; or, processing The module is further configured to generate a second PPDU according to the first field in the frame header of the first PPDU, and the second PPDU includes the second field.

Optionally, the immediate response frame is carried in the second PPDU.

Optionally, the transceiver module may include a receiving module and a sending module. Wherein, the receiving module is used to realize the receiving function of the communication device described in the third aspect, and the sending module is used to realize the sending function of the communication device described in the third aspect.

Optionally, the communication device described in the third aspect may further include a storage module, where programs or instructions are stored in the storage module. When the processing module executes the program or instruction, the communication device can execute the communication method described in the first aspect.

It should be noted that the communication device described in the third aspect may be the receiving end, or a chip (system) or other components or components set in the receiving end, or a device including the receiving end, which is not covered by this application. Do limited. The receiving end refers to a device that receives data, and the receiving end may be an AP or a STA in a communication system.

In addition, for the technical effect of the communication device described in the third aspect, reference may be made to the technical effect of the communication method described in the first aspect, which will not be repeated here.

In a fourth aspect, a communication device is provided. The communication device includes: a transceiver module and a processing module. Wherein, the processing module is configured to generate the first PPDU. Wherein, the frame header of the first PPDU includes a first field, and the first field is used to indicate that an immediate response frame is fed back. A transceiver module, configured to send the first PPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the transceiver module is further configured to receive a second PPDU, the second PPDU includes a second field and a third field, the second field includes L-STF and L-LTF, and the third field includes an immediate response frame.

Further, the processing module is further configured to determine the receiving result of the MPDU in the first PPDU according to the second PPDU.

Optionally, the transceiver module may include a receiving module and a sending module. Wherein, the receiving module is used to realize the receiving function of the communication device described in the fourth aspect, and the sending module is used to realize the sending function of the communication device described in the fourth aspect.

Optionally, the communication device described in the fourth aspect may further include a storage module, where programs or instructions are stored in the storage module. When the processing module executes the program or instruction, the communication device can execute the communication method described in the second aspect.

It should be noted that the communication device described in the fourth aspect may be the sending end, or a chip (system) or other components or components arranged in the sending end, or a device including the sending end, which is not covered by this application. Do limited. The sending end refers to a device that sends data, and the sending end may be an AP or a STA in a communication system.

In addition, for the technical effect of the communication device described in the fourth aspect, reference may be made to the technical effect of the communication method described in the second aspect, which will not be repeated here.

In a fifth aspect, a communication device is provided. The communication device is configured to execute the communication method described in any one of the implementation manners of the first aspect to the second aspect.

In this application, the communication device described in the fifth aspect may be a receiving end or a sending end, or a chip (system) or other components or components set in the receiving end or sending end, or may include a receiving end or a The device at the sending end is not limited in this application. The receiving end refers to a device that receives data, and the receiving end may be an AP or a STA in a communication system. The sending end refers to a device that sends data, and the sending end may be an AP or a STA in a communication system. Wherein, the receiving end is configured to execute the communication method described in any possible implementation manner in the first aspect, and the sending end is configured to execute the communication method described in any possible implementation manner in the second aspect.

It should be understood that the communication device described in the fifth aspect includes corresponding modules, units, or means for implementing the communication method described in any one of the first to second aspects above, and the modules, units, or means can be Realized by hardware, realized by software, or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units for performing the functions involved in the above-mentioned communication method.

In addition, for the technical effect of the communication device described in the fifth aspect, reference may be made to the technical effect of the communication method described in any one of the first aspect to the second aspect, which will not be repeated here.

In a sixth aspect, a communication device is provided. The communication device includes: a processor, configured to execute the communication method described in any one possible implementation manner of the first aspect to the second aspect.

In a possible design solution, the communication device described in the sixth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver can be used for the communication device described in the sixth aspect to communicate with other communication devices.

In a possible design solution, the communication device described in the sixth aspect may further include a memory. The memory can be integrated with the processor or set separately. The memory may be used to store computer programs and/or data involved in the communication method described in any one of the first aspect to the second aspect.

In this application, the communication device described in the sixth aspect may be a receiving end or a sending end, or a chip (system) or other components or components set in the receiving end or sending end, or may include a receiving end or a The device at the sending end is not limited in this application. The receiving end refers to a device that receives data, and the receiving end may be an AP or a STA in a communication system. The sending end refers to a device that sends data, and the sending end may be an AP or a STA in a communication system. Wherein, the receiving end is configured to execute the communication method described in any possible implementation manner in the first aspect, and the sending end is configured to execute the communication method described in any possible implementation manner in the second aspect.

In addition, for the technical effect of the communication device described in the sixth aspect, reference may be made to the technical effect of the communication method described in any one of the implementation manners of the first aspect to the second aspect, which will not be repeated here.

In a seventh aspect, a communication device is provided. The communication device includes: a processor, the processor is coupled with the memory, and the processor is used to execute the computer program stored in the memory, so that the communication device executes any one of the possible implementation manners in the first aspect to the second aspect. communication method.

In a possible design solution, the communication device described in the seventh aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver can be used for the communication device described in the seventh aspect to communicate with other communication devices.

In this application, the communication device described in the seventh aspect may be a receiving end or a sending end, or a chip (system) or other components or components set in the receiving end or sending end, or may include a receiving end or a The device at the sending end is not limited in this application. The receiving end refers to a device that receives data, and the receiving end may be an AP or a STA in a communication system. The sending end refers to a device that sends data, and the sending end may be an AP or a STA in a communication system. Wherein, the receiving end is configured to execute the communication method described in any possible implementation manner in the first aspect, and the sending end is configured to execute the communication method described in any possible implementation manner in the second aspect.

In addition, for the technical effect of the communication device described in the seventh aspect, reference may be made to the technical effect of the communication method described in any one of the implementation manners of the first aspect to the second aspect, which will not be repeated here.

In an eighth aspect, a chip is provided, and the chip includes a processing logic circuit and an interface circuit. Wherein, the number of processing logic circuits may be one or more, and the number of interface circuits may be more than one.

Wherein, the interface circuit is used to receive code instructions and transmit them to the processing logic circuit. The processing logic circuit is configured to run the above code instructions to execute the communication method described in any one of the implementation manners of the first aspect to the second aspect.

Optionally, the chip may include a memory, and the memory may be integrated with the processing logic circuit or set separately. The memory may be used to store computer programs and/or data involved in the communication method described in any one of the first aspect to the second aspect.

In this application, the chip described in the eighth aspect may be located at the receiving end or the transmitting end, and may be located in an AP in a communication system or an STA. Wherein, when the chip is located at the receiving end, it is used to implement the communication method described in any possible implementation manner in the first aspect, and when the chip is located at the sending end, it is used to implement the communication method described in any possible implementation manner in the second aspect. method.

In addition, for the technical effect of the chip described in the eighth aspect, reference may be made to the technical effect of the communication method described in any one of the implementation manners in the first aspect to the second aspect, which will not be repeated here.

In a ninth aspect, a communication system is provided. The communication system includes a first device (receiving end) and a second device (sending end). Wherein, the first device may be an STA or an AP, and the second device may be an AP or an STA. The first device may serve as a receiving end, and the second device may serve as a sending end. The first device is configured to execute the communication method described in any possible implementation manner of the first aspect, and the second device is configured to execute the communication method described in any possible implementation manner of the second aspect.

In a tenth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium includes instructions. When the instructions are executed by a processor, the The communication method is implemented.

In an eleventh aspect, a computer program product is provided, and the computer program product includes an instruction. When the instruction is executed by a processor, the communication method described in any possible implementation manner in the first aspect to the second aspect is executed. accomplish.

For the technical effects brought about by any one of the implementation manners from the third aspect to the eleventh aspect, refer to the technical effects brought about by the corresponding implementation manners in the first aspect or the second aspect, and details are not repeated here.

According to a twelfth aspect, a communication device is provided, and the communication device includes a physical frame generation module, a physical frame demodulation module, a radio frequency transmission link module and a radio frequency reception link module, a MAC frame generation module and a MAC frame reception module. The physical frame generation module, the physical frame demodulation module, the radio frequency transmission link module, and the radio frequency reception link module are used to realize the PHY function, and the MAC frame generation module and the MAC frame reception module are used to realize the MAC layer function. Among them, the radio frequency receiving link module is used to receive the first PPDU; the physical frame demodulation module is used to analyze the frame header of the first PPDU, which includes a first field, and the first field is used to indicate that the feedback is immediate response frame.

In some possible designs, the MAC frame receiving module is configured to parse the MPDU in the first PPDU. The MAC frame generating module is configured to generate an immediate response frame according to the MPDU, and the immediate response frame is used to indicate the receiving result of the MPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the physical frame generation module is configured to generate the second field in the second PPDU according to the first field in the frame header of the first PPDU, and the second field includes L-STF and L-LTF; or, The physical frame generating module is configured to generate a second PPDU according to the first field in the frame header of the first PPDU, and the second PPDU includes the second field.

Optionally, the immediate response frame is carried in the second PPDU.

Optionally, the communication device according to the twelfth aspect may further include a storage module, where programs or instructions are stored in the storage module. When the processing module executes the program or instruction, the communication device can execute the communication method described in the first aspect.

It should be noted that the communication device described in the twelfth aspect may be the receiving end, or a chip (system) or other components or components set in the receiving end, or a device including the receiving end. No limit. The receiving end refers to a device that receives data, and the receiving end may be an AP or a STA in a communication system.

In addition, the technical effects of the communication device described in the twelfth aspect can refer to the technical effects of the communication method described in the first aspect, which will not be repeated here.

In a thirteenth aspect, a communication device is provided, and the communication device includes a physical frame generation module, a physical frame demodulation module, a radio frequency transmission link module and a radio frequency reception link module, a MAC frame generation module and a MAC frame reception module. The physical frame generation module, the physical frame demodulation module, the radio frequency transmission link module, and the radio frequency reception link module are used to realize the PHY function, and the MAC frame generation module and the MAC frame reception module are used to realize the MAC layer function. Wherein, the MAC frame generation module and the physical frame generation module are used to generate the first PPDU. Wherein, the frame header of the first PPDU includes a first field, and the first field is used to indicate that an immediate response frame is fed back. The radio frequency sending link module is configured to send the first PPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the radio frequency receiving link module is used to receive the second PPDU, the second PPDU includes a second field and a third field, the second field includes L-STF and L-LTF, and the third field includes an immediate response frame.

Further, the physical frame demodulation module is used to analyze the second PPDU; the MAC frame receiving module is used to determine the reception result of the MPDU in the first PPDU according to the MPDU in the second PPDU.

Optionally, the communication device described in the thirteenth aspect may further include a storage module, where programs or instructions are stored in the storage module. When the processing module executes the program or instruction, the communication device can execute the communication method described in the second aspect.

It should be noted that the communication device described in the thirteenth aspect may be the sending end, or a chip (system) or other components or components arranged in the sending end, or a device including the sending end. No limit. The sending end refers to a device that sends data, and the sending end may be an AP or a STA in a communication system.

In addition, for the technical effect of the communication device described in the thirteenth aspect, reference may be made to the technical effect of the communication method described in the second aspect, which will not be repeated here.

On the basis of the implementation manners provided in the foregoing aspects, the present application may further be combined to provide more implementation manners.

Description of drawings

FIG. 1 is a schematic diagram of a receiving end feeding back a response frame at the end of SIFS provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a sending and receiving process at a receiving end provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a process in which an existing receiving end sends and receives data frames from a sending end to send a response frame;

FIG. 4 is a schematic diagram of a network architecture of a communication system provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a wireless communication device supporting multiple links for parallel transmission provided by an embodiment of the present application;

FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application;

FIG. 8 is a schematic diagram of the receiving end parsing the MPDU in the first PPDU provided by the embodiment of the present application;

FIG. 9 is a schematic structural diagram of a NACK frame provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another NACK frame provided by the embodiment of the present application;

FIG. 11 is a schematic diagram of a timing sequence of sending and receiving processing at a receiving end provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of a data structure for performing PE filling on the first PPDU according to an embodiment of the present application;

FIG. 13 is a schematic diagram of another data structure for performing PE filling on the first PPDU according to the embodiment of the present application;

FIG. 14 is a schematic diagram of a data structure of a first PPDU in a second scenario provided by an embodiment of the present application;

FIG. 15 is a schematic diagram of a data structure of a second PPDU in a second scenario provided by an embodiment of the present application;

FIG. 16 is a schematic diagram of modules of a communication device provided in an embodiment of the present application;

FIG. 17 is a schematic block diagram of another communication device provided by the embodiment of the present application;

FIG. 18 is a schematic structural diagram of another communication device provided by an embodiment of the present application.

Detailed ways

In order to facilitate understanding of the solutions in the embodiments of the present application, a brief introduction of related technologies is given first.

1. Equipment that realizes the basic characteristics of EHT and equipment that does not realize the basic characteristics of EHT

The 802.11be standard under discussion includes two versions: the first version (Release 1, R1) and the second version (Release 2, R2). The difference between R1 and R2 mainly lies in the different characteristics. R1 only involves some basic characteristics, and R2 will further involve some other characteristics to be determined. In order to distinguish the two versions of equipment, the equipment of the first version can be called the equipment that implements the basic features of EHT. In the standard, the attribute value dot11EHTBaseLineFeaturesImplementedOnly in a management information base can be used to indicate that it is 1. The device of the second version can be called a device that does not implement the basic features of EHT, or a device that implements advanced features of EHT, which can be indicated by using dot11EHTBaseLineFeaturesImplementedOnly as 0, which is not limited by the solution of the present invention.

Herein, for ease of understanding, the device of the first version may be referred to as the R1 device for short, and the device of the second version may be referred to as the R2 device for short.

2. Validate and disregard in the signaling field

In various current standards, in order to leave room for modification of subsequent standards, there are generally confirm bits or confirm states, ignore bits or ignore states in the signaling field.

For example, in the 802.11be standard being discussed at this stage, the signaling field in the physical layer preamble includes: reserved/unused bits (reserved bits), and the reserved/unused bits can be divided into ignore bits and confirmation bits. The value of a (sub) field can be set to a reserved/unused state (entry), and the reserved/unused state (entry) can be divided into a ignore state and a confirmed state, which is set to a reserved/unused state A certain (sub)field of an (entry) may also be called a ignore field or a validation field. For example, in the U-SIG field of EHT sounding NDP, there are 5 ignore bits and 3 confirm bits. In the U-SIG part of the EHT-SIG field of the EHT sounding NDP, there are 2 don't care bits. In the U-SIG field of EHT sounding NDP, the joint indication of the uplink and downlink subfields and the PPDU type and compression mode subfields, there is a confirmation field.

For the don't care bits in a PPDU, the R1 device does not parse the don't care bits, nor execute the function defined by the don't care bits, but parses the PPDU according to the process defined in the R1 standard.

For the confirmation bit in a PPDU, when receiving the PPDU, the R1 device will check whether the value of the confirmation bit is the value specified in the R1 standard, if yes, parse the PPDU according to the process defined in the R1 standard; if not, stop The PPDU is parsed and discarded.

3. ACK policy (policy)

In the current WLAN standard, if the sender sends a data frame to the receiver and asks the receiver to feed back a response frame for the data frame, as shown in Table 1 below, when the sender sends a data frame, it will The frame header sets an ACK policy field, which can be used to indicate whether the receiving end needs to reply the response frame of the data frame, and in what format to reply the response frame, and the response frame can indicate whether the receiving end successfully received the data frame.

Wherein, the length of the ACK policy field can be 2 bits (bit), and the current WLAN standard defines 4 kinds of values of the ACK policy field. For the specific introduction of the values of the 4 ACK policy fields, please refer to Table 1, which will not be repeated here.

Table 1

Among them, the HETP in the above Table 1 can be understood as a high efficiency (high efficiency, HE) trigger based (TB) based physical frame (HE TB PPDU), which means that the ACK, Compressed (Compressed) carried in the HE TB PPDU BA or multi-STA (multi-STA) BA. HETP ACK means an ACK frame that needs to wait for the trigger of the AP to send. HETP ACK can also be understood as: the receiving end uses HE TB PPDU to reply ACK, compressed BA or multi-STA BA after SIFS.

4. SIFS

SIFS refers to the time interval between a data frame and a response frame corresponding to the data frame. Exemplarily, as shown in Figure 1, if the sending end sends a data frame to the receiving end, and requires the receiving end to feed back a response frame (such as an ACK frame) of the data frame, then the receiving end needs to start from the time when the data frame is received , the SIFS time passes and the response frame of the data frame is fed back to the sender at the end of the SIFS time. In other words, after receiving the last sampling point of the time-domain waveform of the data frame at the antenna port and at an interval of SIFS, the receiving end needs to transmit the first sampling point of the time-domain waveform of the ACK frame from the antenna port.

In SIFS, the receiving end needs to send and receive data frames from the sending end to feed back a response frame to the sending end when the SIFS time ends. Wherein, the sending and receiving processing process of the receiving end may include the following operations: PHY receiving data, PHY processing data, MAC layer processing data, PHY sending data, sending and receiving conversion, and so on. Wherein, the PHY receiving data and the PHY processing data may be collectively referred to as PHY receiving and processing data. Correspondingly, as shown in FIG. 2 , the sending and receiving process at the receiving end may include the following processing delays: PHY receiving processing delay, MAC layer processing delay, PHY sending delay, and sending and receiving conversion delay.

Wherein, the PHY reception processing delay can be understood as: the delay experienced by the PHY at the receiving end from receiving a signal from the antenna to transmitting the information of the signal to the upper layer (such as the MAC layer). In other words, the PHY reception processing delay can be: the delay experienced by the PHY at the receiving end from receiving a useful signal from electromagnetic waves to processing the useful signal into information understandable by the upper layer. Wherein, the PHY receiving processing delay may include: PHY receiving (RX PHY) delay and PHY processing (RX processing) delay, the PHY receiving delay corresponds to the above-mentioned PHY receiving data operation, and the PHY processing delay corresponds to the above-mentioned PHY processing data operation.

The processing delay of the MAC layer can be understood as: after receiving the information of the physical layer, the time required for the MAC layer to perform operations such as MAC message parsing, verification, construction of a response frame, and sending parameters. The MAC layer processing delay corresponds to the above MAC layer processing data operation.

The PHY transmission delay can be understood as: after the PHY receives the data frame of the MAC layer, the processing delay on the PHY transmission link, including the modulation and coding of the PHY, spatial mapping, and inverse fast Fourier transformation (IFFT) ) transformation and other operations. The PHY sending delay corresponds to the above PHY sending data operation.

Transceiver switching delay can be understood as: the time required for the PHY radio frequency device to switch from the receiving state to the transmitting state, including the transmitting and receiving switching delay (RxTxSwitchTime) and the transmit ramp-up delay (TxRampOnTime). Transmitting and transmitting conversion delay corresponds to the above-mentioned transmitting and receiving conversion operation.

FIG. 3 is a process in which a conventional receiving end sends and receives data frames from a sending end to send a response frame. As shown in Figure 3, the PPDU (carrying data frame) sent by the sending end to the receiving end includes a PPDU frame header and a payload, and the payload of the PPDU includes one or more orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM ) symbol (symbol) (three OFDM symbols are taken as an example in FIG. 3), the payload of the PPDU is used to carry a MAC frame, and the frame header of the MAC frame carries an ACK policy field. In FIG. 3 , the payload of the PPDU sent by the sender is 3 OFDM symbols, which are the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol.

In Fig. 3, the process of sending and receiving data frames from the sending end at the existing receiving end is as follows:

The PHY sequentially receives the frame header and payload of the PPDU from the sender, and sequentially processes the frame header and payload of the PPDU to obtain the MAC frame carried in the payload of the PPDU; then, reports the MAC frame to the MAC layer . Wherein, the PHY reception delay is the time period AB in FIG. 3 , and the PHY processing delay is the time period BC in FIG. 3 . The MAC layer performs cyclic redundancy code (cyclic redundancy code, CRC) checking, address filtering, and ACK policy field checking on the MAC frame in sequence. After the MAC layer processes the data, the MAC layer at the receiving end needs to judge whether the ACK policy field indicates that a response frame needs to be replied. If the ACK policy field indicates that a response frame needs to be replied, then the terminal device needs to generate a response at the end of the MAC layer processing data (such as time D in Figure 3) and within the remaining time of SIFS (such as time period DE in Figure 3) frame, and send the response frame to the sender when the SIFS time ends (time E in Figure 3).

It can be seen that in FIG. 3 , SIFS is the time period BE. During this period, the reception processing at the receiving end has the following delays: PHY processing delay, MAC layer processing delay, and transmission processing delay. Among them, The transmission processing delay is very short, and the PHY processing delay and MAC layer processing delay will occupy most of the time in SIFS.

Among the PHY processing delay, MAC layer processing delay and transmission processing delay, orthogonal frequency division multiple access (OFDMA), multiple-input multiple-output (MIMO) , low density parity check (low density parity check, LDPC), dual carrier modulation (dual carrier modulation, DCM), MAC protocol data unit aggregation (aggregate MAC protocol data unit, AMPDU), BA, CRC check and other technologies are required It takes a certain amount of processing time. In addition, the analog signal processing delay and the transmission and reception conversion delay necessary for the radio frequency device itself are unavoidable. In other words, the processing timing among the PHY processing delay, MAC layer processing delay and transmission processing delay is already very tight.

However, as the physical layer rate increases, the coding length increases, and the technical complexity of WLAN increases, the PHY processing delay or MAC layer processing delay will inevitably increase. Complete the receive processing operation within. For example, with the further improvement of spectrum efficiency in new-generation standards such as 802.11be (that is, Wi-Fi7), the maximum number of coded bits carried by each OFDM symbol is 47040 bits. In the 802.11ax standard (that is, Wi-Fi6), the maximum number of encoded bits carried by each OFDM symbol is only 19600 bits. To complete the data transmission and data processing between different modules in the chip within the same time, The bus rate and processing speed of the 802.11be-compliant device must be 240% of the 802.11ax-standard chip, resulting in an inevitable increase in the PHY reception processing delay, and the timing of the receiving end is difficult to meet the SIFS timing requirements.

In short, with the increase of the physical layer rate, the increase of the coding length and the increase of the technical complexity of WLAN, it becomes more and more difficult for the timing of the receiving end to meet the SIFS timing requirements. Therefore, how to ensure that the timing of the receiving end satisfies the SIFS timing requirement has become a technical problem that needs to be solved urgently.

In order to solve the above problems, an embodiment of the present application provides a technical solution, and the technical solution includes a communication system, a communication method and a communication device applied to the communication system, and the like. The technical solutions provided by the present application will be described below with reference to the accompanying drawings.

The embodiment of the present application can be applied to the scenario of a wireless local area network, and can be applied to the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 system standard, such as the 802.11a/b/g standard, the 802.11n standard, and the 802.11ac standard , 802.11ax standard, or its next generation, such as the 802.11be standard or a later generation standard. Alternatively, the embodiments of the present application may also be applicable to wireless local area network systems such as an Internet of Things (Internet of Things, IoT) network or a Vehicle to X (V2X, V2X) network. Certainly, the embodiment of the present application can also be applicable to other possible communication systems, for example, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division) duplex, TDD), universal mobile telecommunication system (universal mobile telecommunication system, UMTS), global interconnection microwave access (worldwide interoperability for microwave access, WiMAX) communication system, fifth generation (5th generation, 5G) communication system, and future The sixth generation (6th generation, 6G) communication system and the communication system of the next generation are medium.

An embodiment of the present application provides a communication system, and the communication method described in the present application is applicable to the communication system. The communication system may include: one or more access points (access point, AP), and one or more stations (station, STA).

As an example, please refer to FIG. 4 , which is a schematic diagram of a network architecture of a communication system provided in an embodiment of the present application. In the communication system shown in FIG. 4 , APs include AP1 and AP2 , and STAs include STA1 , STA2 and STA3 . The AP can schedule radio resources for the STA, and transmit data for the STA on the scheduled radio resources. For example, in the communication system shown in FIG. 4 , AP1 may schedule wireless resources for STA1 and STA3, and transmit data for STA1 and STA3 on the scheduled wireless resources, and the data may include uplink data information and/or downlink data information.

It can be understood that one or more APs can communicate with one or more STAs. Of course, APs can communicate with each other, and STAs can communicate with each other.

It should be noted that in FIG. 4 , STA is used as a mobile phone and AP is used as a router as an example, which does not mean that the types of AP and STA in this document are limited. Moreover, the number of APs and STAs in FIG. 4 is only an example, and does not mean that the number of APs and STAs in the communication system herein is limited. The number of APs and STAs in the network architecture of the above-mentioned communication system can be more or less. few.

In the communication system described in this application, an AP may be a device deployed in a wireless communication network and providing wireless communication functions for its associated STAs. APs can be deployed in homes, buildings, and campuses, and of course, they can also be deployed outdoors. The coverage radius of an AP can be tens of meters to hundreds of meters. AP is equivalent to a bridge connecting wired network and wireless network. The role of the AP includes: connecting various wireless network clients together, and then connecting the wireless network to the Ethernet. Specifically, the AP may be a terminal device (such as a mobile phone) or a network device (such as a router) with a wireless-fidelity (wreless-fidelity, Wi-Fi) chip.

The AP can be a device supporting the 802.11be standard. The AP may also be a device supporting multiple wireless local area networks (wireless local area networks, WLAN) standards of the 802.11 family such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. The AP in this application may be an extremely high throughput (extramely high throughput, EHT) AP or a high efficient (high efficient, HE) AP, and may also be an access point applicable to a certain future generation of Wi-Fi standards. Wherein, the extremely high throughput rate may also be referred to as extremely high throughput.

The AP may include a processor and a transceiver. The processor is used to control and manage actions of the AP (such as analyzing signaling information, processing communication-related data, etc.), and the transceiver is used to receive or send information.

In the communication system described in this application, a STA may be a wireless communication chip, a wireless sensor, or a wireless communication terminal, etc., and may also be called a user (or user station). For example, STA can be a mobile phone supporting Wi-Fi communication function, a tablet computer supporting Wi-Fi communication function, a set-top box supporting Wi-Fi communication function, a smart TV supporting Wi-Fi communication function, a Wi-Fi communication function Smart wearable devices, in-vehicle communication devices supporting Wi-Fi communication functions, computers supporting Wi-Fi communication functions, etc.

Optionally, the STA can support the 802.11be standard. The STA can also support multiple wireless local area network (wireless local area networks, WLAN) standards of the 802.11 family such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. The STA in this application may be an extremely high throughput (extramely high throughput, EHT) STA or a high efficient (high efficient, HE) STA, and may also be a station applicable to a certain future generation of Wi-Fi standards.

The STA may include a processor and a transceiver. The processor is used to control and manage actions of the STA (such as analyzing signaling information, processing communication-related data, etc.), and the transceiver is used to receive or send information.

Exemplarily, the above-mentioned STA and AP may be: devices applied in the Internet of Vehicles, IoT nodes, sensors, etc. in the Internet of Things (IoT, internet of things), smart cameras in smart homes, smart remote controllers, smart Water meters, sensors in smart cities, etc., as well as communication servers, routers, switches, bridges, computers, mobile phones, etc.

The APs and STAs involved in the embodiments of the present application may also be collectively referred to as WLAN communication devices. The WLAN communication device may include a hardware structure and a software module. The WLAN communication device may implement various communication functions (such as functions corresponding to the communication method in the embodiments herein) in the form of a hardware structure, a software module, or a hardware structure plus a software module. A certain function among the various communication functions may be implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module.

It should be noted that in the communication system provided by the embodiment of this application, when one device (including AP or STA) sends data to another device (including STA or AP), the device sending data is the sending end, and the device receiving data is Receiving end. Wherein, the transmitting end can implement functions such as signal generation and transmission, and can be an AP or STA; the receiving end can implement functions such as signal acquisition and processing, and can be an STA or AP. Taking Figure 4 as an example, in the uplink communication scenario, AP1 sends data to STA1, AP1 is the sender, and STA1 is the receiver; in the downlink communication scenario, STA1 sends data to AP1, AP1 is the sender, and AP1 is the receiver. Of course, in the communication system provided by the embodiment of this application, one STA can send data to another STA, in this case the sending end and the receiving end are different STAs; one AP can send data to another AP, in this case The sending end and the receiving end are different APs.

In some possible cases, the sending end can be used as the receiving end to realize functions such as signal acquisition and processing; the receiving end can be used as the sending end to realize functions such as signal generation and transmission. In other words, a physical device can be the sender, or it can be the receiver, or both.

The communication device provided in this embodiment of the present application may be a wireless communication device that supports multiple links for parallel transmission, for example, it is called a multi-link device (Multi-link device) or a multi-band device (multi-band device). Compared with devices that only support single-link transmission, multi-link devices have higher transmission efficiency and higher throughput.

A multi-link device includes one or more affiliated STAs (affiliated STAs). An affiliated STA is a logical station that can work on one link. Wherein, the affiliated station may be an access point (Access Point, AP) or a non-Access Point Station (non-Access Point Station, non-AP STA). For the convenience of description, in this application, the multi-link device whose affiliated site is AP can be called multi-link AP or multi-link AP device or AP multi-link device (AP multi-link device), and the affiliated site is non- The multi-link device of the AP STA may be called a multi-link STA or a multi-link STA device or an STA multi-link device (STA multi-link device). For the convenience of description, "the multi-link device includes the subordinate STA" is also briefly described as "the multi-link device includes the STA" in the embodiment of this application.

It should be noted that a multi-link device includes multiple logical sites, and each logical site works on one link, but allows multiple logical sites to work on the same link. The link identifier mentioned below represents a station working on a link, that is, if there is more than one station on a link, more than one link identifier is required to represent them.

Multi-link devices can follow the 802.11 series protocol to achieve wireless communication, for example, follow the extremely high throughput (Extremely High Throughput, EHT) site, or follow the 802.11be-based or compatible 802.11be-supported site to achieve communication with other devices, of course Other devices may or may not be multilink devices.

The non-AP MLD involved in this application can be a wireless communication chip, a wireless sensor or a wireless communication terminal. For example, user terminals, user devices, access devices, subscriber stations, subscriber units, mobile stations, user agents, and user equipment supporting Wi-Fi communication functions, among which, user terminals may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, internet of things (IoT) devices, computing devices or other processing devices connected to a wireless modem, and various forms of user equipment (UE), mobile station (mobile station, MS ), terminal, terminal equipment, portable communication device, handset, portable computing device, entertainment device, gaming device or system, GPS device or any other device configured for network communication via a wireless medium suitable equipment etc. In addition, the non-AP MLD can support the 802.11be standard or the next-generation WLAN standard of 802.11be. Non-AP MLD can also support multiple WLAN standards such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

The AP MLD involved in the embodiment of this application can be a device that is deployed in a wireless communication network to provide wireless communication functions for its associated non-AP, and is mainly deployed in homes, buildings, and campuses, with a typical coverage radius of tens of meters. Of course, it can also be deployed outdoors. AP MLD is equivalent to a bridge connecting the wired network and the wireless network. Its main function is to connect various wireless network clients together, and then connect the wireless network to the Ethernet. Specifically, the AP MLD can be a base station with a Wi-Fi chip, a router, a gateway, a repeater, a communication server, a switch or a bridge and other communication equipment, wherein the base station can include various forms of macro base stations, micro base station, relay station, etc. In addition, the AP MLD can support the 802.11be standard or the next-generation WLAN standard of 802.11be. AP MLD can also support WLAN standards such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

For example, FIG. 5 is a schematic structural diagram of a wireless communication device supporting multiple links for parallel transmission according to an embodiment of the present application.

The embodiments of the present application do not limit the protection scope and applicability of the claims. Those skilled in the art may make adaptive changes to the functions and deployment of elements involved in the present application, or omit, substitute or add various processes or components as appropriate without departing from the scope of the embodiments of the present application.

The communication system provided by the present application has been introduced above, and the communication method provided by the embodiment of the present application will be described below with reference to the accompanying drawings.

The communication method provided in the embodiment of the present application may be applied to the above-mentioned communication system, and may be executed by the sending end and/or the receiving end in the above-mentioned communication system. Please refer to Fig. 6, which is a schematic flowchart of a communication method provided by an embodiment of the present application. The communication method includes S601-S603, which will be described in sequence below.

S601. The sender generates a first PPDU.

Wherein, the frame header of the first PPDU may include a first field, and the first field is used to indicate that an immediate response frame is fed back. In some possible embodiments, the first field may also be used to indicate that the first field is ignored, or used to indicate whether an immediate response frame needs to be fed back according to the ACK policy field in the MPDU, which is not limited in this application. In other words, the first field can indicate two situations, including situation 1 and situation 2. In case 1, the first field can indicate the feedback immediate response frame; in case 2, the first field can indicate that the first field is ignored, in other words, case 2 is used to indicate whether to feedback an immediate response according to the ACK policy field in the MPDU frame.

For example, assuming that the length of the first field is 1 bit, when the first field indicates 1, the receiver is instructed to feed back an immediate response frame; when the first field indicates 0, the receiver is instructed to ignore the first field. Of course, when the first field indicates 0, the receiver is instructed to feed back an immediate response frame; when the first field indicates 1, the receiver is instructed to ignore the first field, which is not limited in this application. In addition, the first field in this embodiment of the present application may be called an immediate response indication field, or a similar concept such as an immediate response indication field, which is not limited in this application.

Optionally, the above-mentioned first field may be implemented in the following manner: the first field is carried in any one of U-SIG, EHT-SIG common field (common field) or EHT-SIG user field (user field). In this way, the first field can be carried in the above field to indicate the receiving end to feed back the immediate response frame, so as to improve the utilization rate of signaling. Exemplarily, the implementation manner of the first field is introduced below in conjunction with manner 1 to manner 3, which is not limited here.

Mode 1, the first field is carried in the U-SIG. In some possible embodiments, the reserved field in the U-SIG may be defined as the first field, that is, the U-SIG in the frame header of the first PPDU includes the first field. Exemplarily, in the 802.11be standard, as shown in Table 2 below, one or more bits in B20-B24 or B25 of the first symbol of the U-SIG may be defined as the first field. For example, the B20 of the first symbol of U-SIG is defined as the first field. In this case, it can be further defined that when the B20 of the first symbol of U-SIG indicates 1, it indicates a feedback immediate response frame; when U - When the B20 indication of the first symbol of the SIG is 0, it indicates that the B20 of the first symbol of the U-SIG is ignored. Or, define B20-B24 of the first symbol of U-SIG as the first field. In this case, it can be further defined that when the B20-B24 of the first symbol of U-SIG indicates all 1s (that is, B20 - When B24 are all 1), indicate feedback immediate response frame; when B20-B24 of the first symbol of U-SIG is not indicated as all 1, indicate to ignore B20-B24 of the first symbol of U-SIG. Alternatively, the B25 of the first symbol of U-SIG is defined as the first field. In this case, it can be further defined that when the B25 of the first symbol of U-SIG indicates 1, it indicates that the immediate response frame is fed back; when When the B25 indication of the first symbol of the U-SIG is 0, it indicates that the B20 of the first symbol of the U-SIG is ignored.

Table 2

For ease of understanding, the explanation of Bx-By in this paper is as follows: Bx is used to represent the xth bit, By is used to represent the yth bit, Bx-By is used to represent the xth bit to the yth bit, x and y are integers, And x≥0, y≥0, y≥x. For example, B20-B24 represent the 21st to 25th bits.

Mode 2, the first field is carried in the public field of EHT-SIG. In some possible embodiments, the reserved field in the common field of the EHT-SIG may be defined as the first field, that is, the common field of the EHT-SIG in the frame header of the first PPDU includes the first field. Exemplarily, in the 802.11be standard, as shown in Table 3 below, B13-B16 of the public field of the EHT-SIG may be defined as the first field. For example, define the B13 of the public field of EHT-SIG as the first field, in this case, it can be further defined that when the B13 of the public field of EHT-SIG indicates 1, it indicates that the immediate response frame is fed back; when the EHT-SIG When the B13 indication of the public field of the EHT-SIG is 0, it indicates that the B13 of the public field of the EHT-SIG is ignored. Or, define B13-B16 of the public field of EHT-SIG as the first field, in this case, it can be further defined that when B13-B16 of the public field of EHT-SIG indicates all 1s (that is, B13-B16 When both are 1), it indicates to feed back an immediate response frame; when B13-B16 of the common field of the EHT-SIG is not indicated as all 1, it indicates to ignore B13-B16 of the common field of the EHT-SIG.

table 3

Mode 3, the first field is carried in the user field of the EHT-SIG. In some possible embodiments, the reserved field in the EHT-SIG user field may be defined as the first field, that is, the EHT-SIG user field in the frame header of the first PPDU includes the first field. Among them, the user field of EHT-SIG can be used to indicate user-related information for each receiving end, such as user identification (STA-ID), modulation and coding scheme (modulation and coding scheme, MCS), coding method, spatial stream information wait. Exemplarily, in the 802.11be standard, in the user field of the non-multi-user multiple-input multiple-output (MU-MIMO) type EHT-SIG, B15 (bit 15) is reserved field. B15 of the user field of non-MU-MIMO EHT-SIG can be defined as the first field. In this case, it can be further defined that when B15 of the user field of EHT-SIG indicates 1, it indicates that the feedback immediate response frame ; When B15 of the user field of the EHT-SIG indicates 0, it indicates that B15 of the user field of the EHT-SIG is ignored. In this way, the sending end can more finely determine which receiving ends need to feed back the immediate response frame, and which receiving ends ignore the indication of the first field, so that the sending end can more flexibly schedule the receiving end.

It should be noted that, the implementation manners of the first field shown in the foregoing manners 1 to 3 may be applicable to the 802.11 system standard, such as the 802.11be standard or the next-generation standard, which is not limited in this application.

Optionally, in the above S601, generating the first PPDU at the sending end may include: if the first condition or the second condition is satisfied, generating the first PPDU, the frame header of the first PPDU includes the first field, the first field Used to indicate Feedback Immediate Response frame. In other words, when the first condition or the second condition is satisfied, the sending end requires the receiving end to feed back the immediate response frame of the first PPDU.

Wherein, the first condition may include: the number of the receiving end is one, and the sending end requires the receiving end to feed back an immediate response frame. The second condition may include: the number of receiving ends is multiple, and each receiving end does not use MU-MIMO, and the sending end requires each receiving end to feed back an immediate response frame, and the sending end requires each receiving end to use the first The frequency resource feedback used by PPDU is the immediate response frame. Further, the second condition may also include that the sending end requires each receiving end to use the default power feedback to immediately respond to the frame.

The aforementioned sending end requesting the receiving end to feed back an immediate response frame can be understood as: when sending a data frame to the receiving end, the sending end expects the receiving end to reply the immediate response frame of the data frame. For example, in the data frame sent from the sender to the receiver, the ACK policy of at least one MPDU is set to normal ACK, implicit BAR or HETP ACK.

In some possible embodiments, the receiving end may use the second PPDU to feed back an immediate response frame (relevant descriptions may refer to the following S604-S609, which will not be described in detail here). In this case, the above-mentioned sending end requires each The receiving end uses the frequency resources used by the first PPDU to feed back the immediate response frame, which can be understood as: the sending end requires each receiving end to use the frequency resources used by the first PPDU to feed back the L-STF and L-LTF of the second PPDU; the above-mentioned sending end Requiring each receiving end to use the default power to feed back the immediate response frame may be understood as: the sending end requires each receiving end to use the default power to feed back the L-STF and L-LTF of the second PPDU. In other words, the transmission bandwidth may be the frequency resource used by the first PPDU, and the transmission power of the L-STF and L-LTF of the second PPDU may be the default power (such as the maximum power).

In actual application, the sending end may use the BW of the frame header of the first PPDU to indicate the sending bandwidth of the L-STF and L-LTF of the second PPDU. Optionally, the sending end may use the BW of the frame header of the first PPDU to indicate that the sending bandwidth of the L-STF and L-LTF of the second PPDU is the frequency resource used by the first PPDU.

It can be understood that the above-mentioned first condition can be realized in a first scenario, and the first scenario refers to a scenario in which a sending end communicates with a receiving end, and the first scenario can also be referred to as a send-and-receive scenario. The above-mentioned second condition can be realized in the second scenario. The second scenario refers to a scenario in which a sender communicates with multiple receivers. In the second scenario, the sender is an AP and multiple receivers are STAs. The second scenario It can also be called a send-multiple-receive scenario. Regarding the implementation manners of the sending end and the receiving end in the first scenario and the second scenario, reference may be made to the relevant description below, and details are not repeated here.

It should be noted that, for the relevant description of the immediate response frame in S601 above, reference may be made to the relevant description of S606 below, and details are not repeated here.

S602. The sending end sends the first PPDU to the receiving end.

The receiving end receives the first PPDU from the sending end.

S603. The receiving end parses the frame header of the first PPDU.

Exemplarily, the PHY at the receiving end may parse the frame header of the first PPDU to obtain the STA-ID field in the first field and the user field. One or more STA-IDs may be included in the user field of the frame header of a PPDU. Wherein, for a detailed description of the first field, reference may be made to relevant expressions in S601 above, and details are not repeated here. The STA-ID is used to indicate the identity of the STA, and can help the STA determine whether the received PPDU is a PPDU sent to the STA. For example, referring to Figure 4, assuming that STA2 receives a PPDU, after parsing, it is determined that there is a STA-ID consistent with the STA-ID of STA2 in the frame header of the PPDU, then it means that the PPDU is a PPDU sent to STA2, and STA2 can further Parse the payload portion of the PPDU.

In the above S601-S603, the first PPDU is sent from the sending end to the receiving end, and the STA-ID consistent with the STA-ID of the receiving end exists in the first PPDU. In addition, the sending end needs the receiving end to feed back the immediate response frame of the MAC frame in the first PPDU, therefore, the first field in the frame header of the first PPDU is used to indicate to feed back the immediate response frame. From the perspective of the sender, the sender can determine that the first field in the first PPDU is used to indicate the feedback immediate response frame, and there is a STA-ID consistent with the STA-ID of the receiver in the first PPDU, but from the perspective of the receiver, The receiving end cannot pre-determine this information. Therefore, after the receiving end parses the frame header of the first PPDU and obtains the STA-ID field in the first field and the user field, it can perform the following

steps

1 and 2 to determine whether immediate feedback is required. response frame.

Step 1, determine the information indicated by the first field of the frame header of the first PPDU, if the first field indicates a feedback immediate response frame, then perform the following step 2; if the first field indicates to ignore the first field, then ignore the first field.

In some possible embodiments, if the first field of the frame header of the first PPDU indicates to ignore the first field, then the receiving end can parse the MPDU in the first PPDU to obtain the ACK policy field in the MPDU, and according to the ACK policy The indication of the field determines whether an immediate response frame is fed back.

Step 2, judge whether the STA-ID field in the user field of the frame header of the first PPDU includes the STA-ID of the receiving end, if the STA-ID field in the user field includes the STA-ID of the receiving end, then it is determined that it needs to be generated and fed back immediately Response frame; if the STA-ID field in the user field does not include the STA-ID of the receiving end, it can be determined that the first PPDU is not sent to the receiving end, and the first field can be ignored, which can also be understood as ignoring the first PPDU.

Of course, the

above steps

1 and 2 can also be replaced by the following steps 3 and 4.

Step 3, judge whether the STA-ID field in the user field of the frame header of the first PPDU includes the STA-ID of the receiving end, if the STA-ID field in the user field includes the STA-ID of the receiving end, then perform step 4; if the user The STA-ID field in the field does not include the STA-ID of the receiving end, then the first PPDU can be ignored.

Step 4. Determine the information indicated by the first field. If the first field indicates that an immediate response frame is fed back, it is determined that an immediate response frame needs to be generated and fed back; if the first field indicates that the first field is ignored, the first field is ignored.

Those skilled in the art should understand that the above step 1 and step 2, step 3 and step 4 are only to better explain the details of the implementation of the method of this application, and in the actual PPDU analysis, the internal implementation steps and sequence are not limited , it only needs to be able to realize the above functions, and there is no limitation in this embodiment of the present application.

In the above S601-S603, the sending end may send the first PPDU to the receiving end, and the frame header of the first PPDU carries a first field, and the first field is used to indicate to feed back an immediate response frame. In this way, when parsing the frame header of the first PPDU, the receiving end may determine that an immediate response frame needs to be fed back according to the indication of the first field in the frame header of the first PPDU. However, in the current technology, the receiving end needs to complete the analysis of the MPDU of the first PPDU at the MAC layer before determining that an immediate response frame needs to be fed back. That is to say, the present application can determine in advance that an immediate response frame needs to be fed back, so that The receiving processing of the receiving end can be made more flexible, and the timing of the receiving end can be guaranteed to meet the SIFS timing requirement.

Wherein, when the receiving end determines that an immediate response frame needs to be generated and fed back, the PHY of the receiving end may start to generate a second PPDU, and the second PPDU is used to carry the immediate response frame. For related descriptions, refer to S604-S609 below.

Optionally, FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application. As shown in FIG. 7, after the communication method S603 shown in FIG. 6 above, the following S604-S609 may also be included, the following Introduce separately.

S604. The receiving end generates the second field in the second PPDU according to the first field in the frame header of the first PPDU.

Wherein, the second PPDU is used to carry the immediate response frame, and the second PPDU may include two parts of fields, which are respectively the second field and the third field. Optionally, the second field may be a field generated by the PHY at the receiving end according to the frame header of the first PPDU when generating the second PPDU, wherein the second field may also be understood as a fixed sequence in the PPDU that has nothing to do with the MAC layer information, such as It can be the non-HT preamble (Non-HT preamble) of the start field of the physical frame, including L-STF and L-LTF. For the description of the third field, reference may be made to the following S607, which will not be repeated here.

Exemplarily, after the PHY of the receiving end completes the parsing of the frame header of the first PPDU, if the first field indicates feedback of an immediate response frame, the PHY of the receiving end may generate the second field according to the indication of the first field without waiting for the MAC layer to The analysis result of the MPDU in the first PPDU, that is, the time when the PHY of the receiving end generates the second field may be before or after the MAC layer parses the MPDU in the first PPDU. At this time, the receiving end can continue to receive and The operation of parsing data improves processing efficiency.

In some possible embodiments, the second field is usually located at the frame header of the second PPDU. Optionally, the above-mentioned second field may include L-STF and L-LTF of the frame header of the second PPDU, where the L-STF and L-LTF may be generated by the PHY at the receiving end according to the frame header of the first PPDU. That is to say, the second PPDU includes L-STF and L-LTF. When the second field includes L-STF and L-LTF, the receiving end needs 16 microseconds of sending time when sending L-STF and L-LTF, so that the process of receiving and processing the first PPDU at the receiving end can be extended by at least 16 microseconds, to ensure that the timing of the receiving end meets the SIFS timing requirements. Moreover, the processing timing requirements of the receiving end can be relaxed, so that the receiving processing of the receiving end is more flexible.

Optionally, the above-mentioned sending bandwidth of the second field may be indicated by the BW of the frame header of the first PPDU. Taking the example that the second field includes L-STF and L-LTF, the transmission bandwidth of L-STF and L-LTF may be indicated by the bandwidth field of the frame header of the first PPDU. Wherein, the bandwidth field of the frame header of the first PPDU may indicate that the transmission bandwidth of the L-STF and L-LTF of the second PPDU is the frequency resource used by the first PPDU. In other words, the receiving end may use the frequency resources used by the first PPDU to send the second field to the sending end.

Optionally, the above-mentioned sending power of the second field may be determined by the receiving end, or the above-mentioned sending power of the L-STF and L-LTF may be a default power, for example, the default power may be the maximum power. In this way, the receiving end can determine the sending power of the second field, and send the second field according to the sending power at the end of SIFS, which can ensure that the timing of the receiving end meets the timing requirements of SIFS and improve the flexibility of sending the second field at the receiving end.

It should be noted that, in this embodiment of the application, the second PPDU refers to the PPDU carrying the immediate response frame, the second field refers to the first part of the field in the second PPDU, and the third field refers to the second part of the second PPDU field, the second part of the field is the remaining fields in the second PPDU other than the first part of the field. Wherein, unless otherwise specified, the second field includes L-STF and L-LTF, and the third field includes an immediate response frame, which will be described uniformly here and will not be repeated hereafter.

S605. The receiving end parses the MPDU in the first PPDU.

The number of MPDUs contained in the payload in the first PPDU may be one or more, and the type of MPDU contained in the payload in the first PPDU may be MPDU, A-MPDU, S-MPDU, etc., which is not limited in this application.

Exemplarily, as shown in Figure 8, the PHY of the receiving end can parse the load in the first PPDU, which contains at least one MPDU (hereinafter denoted as the first MPDU), and then transfer the load to the MAC layer of the receiving end; receiving The MAC layer at the end can perform operations such as frame check sequence (frame check sequence, FCS) checking, ACK policy field inspection, etc. to the at least one first MPDU, and obtain at least one MPDU (hereinafter referred to as the second MPDU) that requires feedback of an immediate response frame. The FCS check result. Wherein, the second MPDU refers to: the MPDU in which the ACK policy field in at least one first MPDU included in the payload of the first PPDU indicates to feed back an immediate response frame.

In S605, the receiving end may obtain at least one second MPDU after parsing the MPDU in the first PPDU.

S606, the receiving end generates an immediate response frame according to the MPDU.

Wherein, the immediate response frame is used to indicate the receiving result of the third MPDU, and the third MPDU indicates the MPDU that the sending end instructs the receiving end to feed back, which is not limited in this application. Exemplarily, if the second MPDU is a BAR, then the third MPDU may include an MPDU in which the second MPDU indicates that an immediate response frame needs to be fed back; if the second MPDU is not a BAR, then the third MPDU may be the second MPDU.

Optionally, the above immediate response frame may include any of the following: ACK frame, BA frame, NACK frame, NDP BA frame, BA TWT frame, TWT ACK frame, short TWT ACK frame, QoS+CF-ACK frame. Wherein, the ACK frame may be used to indicate that the MPDU in the first PPDU is successfully received, and the BA frame may be used to indicate the receiving result of multiple third MPDUs. A NACK frame may be used to indicate that the third MPDU was not successfully received. The NDP BA frame may be used to indicate the reception result of one or more third MPDUs, the short TWT ACK frame may be used to indicate the reception result of the third MPDU, and the TWT ACK frame may be used to indicate the reception result of the third MPDU. The BA TWT frame may be used to indicate the reception result of a plurality of third MPDUs. The QoS+CF-ACK frame may be used to indicate the reception result of the third MPDU.

The above receiving result can be understood as: whether at least one third MPDU sent by the sender is successfully received. Taking the BA frame as an example, if N third MPDUs are successfully received and M third MPDUs are not successfully received, then the BA frame can be used to indicate that the N third MPDUs were successfully received and the M third MPDUs were not successfully received. Three MPDUs, N can be a positive integer greater than or equal to 0, M can be a positive integer greater than or equal to 0, other types of immediate response frames are taken as an example, and will not be repeated here. Exemplarily, the BA frame can be indicated in the form of a bitmap (bitmap), and the bitmap can include multiple bits, each bit corresponds to an MPDU, and each bit can be used to indicate the reception result of an MPDU, for example, setting A bit of 0 indicates that the MPDU corresponding to this bit has not been successfully received, and a bit set to 1 indicates that the MPDU corresponding to this bit has been successfully received. In a possible example, assuming that the bitmap in the BA frame is 011000, and the bits in 011000 correspond to MPDU1~MPDU6 in order from left to right, then the bitmap can indicate that MPDU1, MPDU4~MPDU6 were not successfully received, and MPDU2 , MPDU3 is successfully received.

Exemplarily, the receiving end may generate an immediate response frame according to the FCS check result of at least one third MPDU. Specifically, taking an ACK frame, a BA frame and a NACK frame as an example, when the FCS check result is that the FCS check of the third MPDU is correct, an ACK frame or a BA frame is generated; when the FCS check result is the FCS of all the third MPDU check error, then generate a NACK frame or a BA frame, the bitmap (bitmap) of the BA frame is used to indicate that all the third MPDUs have not been successfully received, for example, the bitmap of the BA frame can be all 0, to indicate that all the third MPDU Three MPDUs were not successfully received.

Optionally, the above-mentioned immediate response frame may include a frame control (frame control) field, and the frame control field may include a type field, a subtype field, and a control frame extension field. Wherein, when the receiving end generates the NACK frame, it can use the type field, the subtype field and the control frame extension field to jointly indicate that the immediate response frame is a NACK frame. The implementation methods may include the following modes 4 to 5, which will be introduced respectively below.

Mode 4, using the type field and the subtype field to indicate: the type of the immediate response frame is indicated by the extension field of the control frame. In some possible embodiments, if the type field indicates 1 and the subtype field indicates 6, then the type indicating the immediate response frame is indicated by the control frame extension field. Wherein, when the type of the immediate response frame is indicated by the extension field of the control frame, the reserved value in the extension field of the control frame may be used to indicate that the type of the immediate response frame is a NACK frame. Specifically, as shown in Table 4, the type field indicates 1, the subtype field indicates 6, and indicates that the type of the immediate response frame is indicated by the control frame extension field, wherein, when the control frame extension field indicates 0000, 0001 or 1011～ When one or more of 1111 are selected, it may indicate that the type of the immediate response frame is a NACK frame, indicating that the receiving end has received the first PPDU but failed to receive it. Wherein, when the type field indicates 1, the subtype field indicates 6, and the control frame extension field indicates one or more of 0000, 0001 or 1011-1111, the format of the NACK frame may be as shown in FIG. 9 .

Table 4

In mode 5, the type field and the subtype field are used to indicate the type of the immediate response frame. In some possible embodiments, when the type field indicates 1 and the subtype field indicates one or more of 0, 1, 2 or 15, it indicates that the type of the immediate response frame is a NACK frame, indicating that the receiving end receives to the first PPDU, but failed to receive. Wherein, when the type field indicates 1, and the subtype field indicates one or more of 0, 1, 2 or 15, the format of the NACK frame may be as shown in FIG. 10 .

In some possible embodiments, if the MPDU in the first PPDU is not successfully received, the receiving end may not generate an immediate response frame, that is, neither generate the third field nor send the third field in the second PPDU. In this way, when the sending end does not receive the third field within the specified time, it can determine that the immediate response frame is a NACK frame, and the receiving end fails to receive the first PPDU after receiving the first PPDU. This implicitly indicates that the immediate response frame is a NACK frame.

S607. The receiving end generates a third field in the second PPDU according to the immediate response frame.

Wherein, the third field is another part of fields in the second PPDU, and the third field includes an immediate response frame, that is, the immediate response frame can be carried in the second PPDU. Exemplarily, if the above-mentioned second field includes L-LTF and L-STF, then the third field may include the remainder of the frame header of the second PPDU and a PHY service data unit (PHY service data unit, PSDU), the PSDU includes The immediate response frame above.

Exemplarily, the third field may be a field generated by the PHY of the receiving end according to the MAC layer transmission parameter indication and the MAC layer payload (including the immediate response frame) when generating the second PPDU. Specifically, when the receiving end generates the third field, the MAC layer of the receiving end can generate the MAC layer load (including the immediate response frame) and the sending parameter indication of the MAC layer according to the analysis result of the MPDU of the first PPDU, and then send the MAC layer to the PHY Layer payload and MAC layer transmission parameter indication; the PHY at the receiving end may generate the third field according to the MAC layer payload from the MAC layer and the MAC layer transmission parameter indication. Wherein, the transmission parameter indication of the MAC layer can be understood as: transmission parameters such as transmission bandwidth, transmission power, and MCS, and the MAC layer payload can be understood as an MPDU generated by the MAC layer, that is, including an immediate response frame.

S608. The receiving end sends the second PPDU to the sending end.

The sending end receives the second PPDU from the receiving end.

In combination with the above description, the second PPDU may include the second field and the third field, and when sending the second PPDU, the receiving end may send the second field and the third field of the second PPDU in sequence.

For the second field of the second PPDU, taking the second field including L-STF and L-LTF as an example, the PHY at the receiving end may send the L-STF and L-LTF of the second PPDU to the sending end when the SIFS ends.

For the third field of the second PPDU, the receiving end may send the third field in the second PPDU to the sending end when the sending time of the second field ends. Wherein, the transmission power of the third field may be indicated by the Triggered Response Scheduling (triggered response scheduling, TRS) control (Control) field in the trigger (Trigger) frame or MPDU, and the transmission bandwidth of the third field may be indicated by the MPDU contained in the first PPDU The resource unit indication (RU allocation) field in the RU allocation field indicates, for example, the transmission bandwidth of the third field is indicated by the RU allocation field in the Trigger frame, or indicated by the RU allocation field in the TRS control field in the MPDU.

In S601-S608, the sending end may send a first PPDU to the receiving end, where a frame header of the first PPDU carries a first field, and the first field is used to indicate that an immediate response frame is fed back. In this way, during the process of sending the second field of the second PPDU, the receiving end can continue to receive and process the first PPDU, such as parsing the first PPDU to generate the third field, that is, it can continue to execute the above S605- One or more steps in S607. In other words, the end time of the reception process of the first PPDU by the receiving end may be before the end of the sending time of the second field. However, in the prior art, the end time of the receiving process of the first PPDU needs to be before the end of the SIFS. Therefore, this application can relax the PHY processing delay, MAC layer processing delay and transmission processing delay, that is, it can prolong the reception and processing time of the PPDU at the receiving end, and ensure that the processing timing of the receiving end meets the SIFS timing requirements, and can pass Relaxing the processing timing requirements of the receiving end makes the receiving processing of the receiving end more flexible.

It should be noted that those skilled in the art should understand that the above S603-S608 are only for better explaining the implementation details of the method of this application, and do not limit the actual analysis of the first PPDU and the sending of the second PPDU. The implementation steps and sequence are only required to implement the above functions, which are not limited in this embodiment of the present application.

In some possible embodiments, the above S604 and S608 may be summarized as sending the second PPDU according to the first field in the frame header of the first PPDU, and the second PPDU includes the second field. The above S607 and S608 can be summarized as sending the second PPDU according to the immediate response frame, and the second PPDU includes the third field, which is not limited in this application.

S609. The sending end determines a receiving result of the MPDU in the first PPDU according to the second PPDU.

Exemplarily, the sending end may parse the immediate response frame in the second PPDU, and determine the reception result of the MPDU in the first PPDU according to the immediate response frame.

Exemplarily, if the immediate response frame in the second PPDU is an ACK frame, it may be determined that the MPDU in the first PPDU is sent successfully.

If the immediate response frame in the second PPDU is a BA frame, it may be determined which MPDUs are successfully sent and which MPDUs are failed to be sent according to the indication of the bitmap in the BA frame.

If the sending end does not support the NACK frame, and does not analyze that the immediate response frame in the second PPDU is an ACK frame, it can be determined that the MPDU in the first PPDU fails to be sent.

If the sending end supports NACK frames, and the immediate response frame in the second PPDU is a NACK frame, it can be determined that the MPDU in the first PPDU fails to be sent.

In some possible embodiments, the receiving end may not generate an immediate response frame, that is, the third field is not generated, and the third field in the second PPDU is not sent. Therefore, if the sending end supports NACK frames and specifies If the third field is not received within the time, it can be determined that the MPDU in the first PPDU fails to be sent.

The PPDU in this embodiment of the present application includes the above-mentioned first PPDU and second PPDU. The first PPDU may be an EHT PPDU or a PPDU of a later version, and the second PPDU may be a PPDU of any format.

In the embodiment of the present application, the type of the MAC frame in the above-mentioned first PPDU can be any of the following: data frame, request to send (request to send, RTS) frame, power save poll (power save poll, PS-Poll) frame , high throughput (high throughput, HT) explicit (null data packet, NDP) frame, very high throughput (very high throughput, VHT) null data packet announcement (null data packet announcement, NDPA) And NDP frame (can be represented by VHT NDPA+NDP frame), VHT beamforming report poll (beamforming report poll, BFRP) frame, basic (Basic) trigger (Trigger) frame, BFRP Trigger frame, multi-user request to send (multi -user request to send, MU-RTS) Trigger frame, multi-user block ack request (multi-user block ack request, MU-BAR) Trigger frame, buffer status report poll (buffer status report poll, BSRP) Trigger frame, group Broadcast retransmission (group-cast retry, GCR) MU-BAR Trigger frame, bandwidth query report poll (bandwidth query report poll, BQRP) Trigger frame, NDP feedback report poll (NDP feedback report poll, NFRP) Trigger frame. The type of the above-mentioned immediate response frame can be any of the following: ACK frame, clear to send frame (CTS), beamforming report (beamforming report, BFR) frame, VHT compressed (compressed) BFR frame, quality of service (quality of service, QoS) data (Data) frame, high efficiency (high efficiency, HE) compressed BFRP frame, BA frame, multi STA-BA (MultiSTA-BA) frame, QoS empty (Null) Data frame, NDP feedback (feedback )frame. Among them, Table 5 is the corresponding relationship between the type of the MAC frame in the first PPDU and the type of the immediate response frame, as shown in Table 5 below, taking the type of the MAC frame in the first PPDU as an RTS frame as an example, the immediate response frame corresponding to the RTS frame The type of can be a CTS frame, that is, when the MAC frame in the first PPDU is an RTS frame, the immediate response frame fed back by the receiving end can be a CTS frame.

table 5

第一PPDU中MAC帧的类型Type of MAC frame in the first PPDU	立即响应帧的类型Type of immediate response frame
数据帧Data Frame	ACK帧ACK frame
RTS帧RTS frame	CTS帧CTS frame
PS-Poll帧PS-Poll frame	ACK帧ACK frame
HT explicit NDP帧HT explicit NDP frame	BFR帧BFR frame
VHT NDPA+NDP帧VHT NDPA+NDP frame	VHT Compressed BFR帧VHT Compressed BFR frame
VHT BFRP帧VHT BFRP frame	VHT Compressed BFR帧VHT Compressed BFR frame
Basic Trigger帧Basic Trigger frame	QoS Data帧QoS Data frame
BFRP Trigger帧BFRP Trigger frame	HE compressed BFRP帧HE compressed BFRP frame
MU-RTS Trigger帧MU-RTS Trigger frame	CTS帧CTS frame
MU-BAR Trigger帧MU-BAR Trigger frame	BA帧或MultiSTA-BA帧BA frame or MultiSTA-BA frame
BSRP Trigger帧BSRP Trigger frame	QoS Null Data帧QoS Null Data frame
GCR MU-BAR Trigger帧GCR MU-BAR Trigger frame	BA帧BA frame
BQRP Trigger帧BQRP Trigger frame	QoS Null Data帧QoS Null Data frame
NFRP Trigger帧NFRP Trigger frame	NDP feedback帧NDP feedback frame

FIG. 11 is a schematic diagram of a timing sequence of sending and receiving processing at the receiving end provided by an embodiment of the present application. The above-mentioned processes of S601 to S609 will be described below with reference to FIG. 11 .

Exemplarily, as shown in FIG. 11 , the first PPDU (carrying a data frame) sent by the sending end to the receiving end includes a PPDU frame header and a payload, and the payload of the PPDU includes one or more OFDM symbols (represented in FIG. 11 as 3 OFDM symbols as an example), the payload of the PPDU is used to carry a MAC frame, and the frame header of the MAC frame carries an ACK policy field. In FIG. 11 , the payload of the PPDU sent by the sender is 3 OFDM symbols, which are the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol.

At time A in FIG. 11 , the receiving end completes the parsing of the PHY frame header of the first PPDU, and obtains the first field in the frame header of the first PPDU, and the first field indicates a feedback immediate response frame. The receiving end may generate the second field according to the indication of the first field, and send the second field when the SIFS ends (time D in FIG. 11 ).

Before the end of the sending time of the second field, within the time period AE in Figure 11, the receiving end can perform the following operations: the PHY of the receiving end can receive and process the first PPDU, including receiving and processing the 3 OFDM symbols in the first PPDU, and obtain The MPDU in the first PPDU is sent to the MAC layer; the MAC layer at the receiving end performs a MAC receiving processing operation to parse the MPDU in the first PPDU to generate an immediate response frame; the MAC layer at the receiving end instructs the PHY layer to generate a third field, which The third field is used to carry the immediate response frame.

Finally, the MAC layer at the receiving end may send the third field when the sending time of the second field ends (time E in FIG. 11 ). In short, the end time of receiving processing of the first PPDU by the receiving end may be located before the second field. However, in the prior art, the end time of receiving processing of the first PPDU at the receiving end needs to be before the end of the SIFS. In this way, the present application can extend the receiving and processing time of the PPDU at the receiving end, ensure that the processing timing of the receiving end meets the SIFS timing requirement, and relax the processing timing requirement of the receiving end, making the receiving and processing of the receiving end more flexible.

Optionally, in FIG. 11 , after the MAC layer processing delay, a sending processing delay (not shown in FIG. 11 ) may also be included, and the sending processing delay is located between the MAC layer processing delay and time E. During the sending processing delay, the receiving end may perform a sending processing operation of the third field of the second PPDU, so as to send the third field of the second PPDU at time E.

As a feasible implementation manner, in the above S601, when the sending end generates the first PPDU, the sending end may perform MAC padding on the first PPDU. The details are as follows: when generating the MAC frame of the first PPDU, the MAC layer of the sending end may add a padding field after the valid data of the MAC frame, that is, add a part of invalid data bits after the MAC frame as a new MAC frame. As shown in FIG. 12 , after receiving valid data in the MAC frame (shown as DATA in FIG. 12 ), the receiving end can perform data verification and generate an immediate response frame. Then, after receiving all the data in the MAC frame (including valid data and filling fields), the receiving end sends an immediate response frame to the sending end through SIFS. In this way, the receiving and processing time of the PPDU at the receiving end can be further extended, the processing timing of the receiving end can be guaranteed to meet the SIFS timing requirement, and the processing timing requirement of the receiving end can be relaxed, making the receiving and processing of the receiving end more flexible.

As a feasible implementation manner, in the above S601, when the sending end generates the first PPDU, the sending end may perform packet extension (packet extension, PE) padding on the first PPDU. details as follows:

The PHY at the sending end may add a PE padding field at the end of the first PPDU after generating the first PPDU. When receiving the first PPDU, the receiving end may send the obtained MPDU to the MAC layer after receiving the data other than the PE filling field in the first PPDU, and the MAC layer of the receiving end performs data verification and generates an immediate response frame. After receiving all the data in the first PPDU, the PHY at the receiving end sends an immediate response frame to the sending end through SIFS. In this way, the receiving and processing time of the PPDU at the receiving end can be further extended, the processing timing of the receiving end can be guaranteed to meet the SIFS timing requirement, and the processing timing requirement of the receiving end can be relaxed, making the receiving and processing of the receiving end more flexible.

Wherein, as shown in FIG. 13, when sending the first PPDU at the PHY layer, in order to align the OFDM symbol boundary, the sender may add feedforward error correction (forward error correction, FEC) output bits (FEC output bits) at the PHY layer Post FEC padding of a certain length, this part of the data does not need to be encoded by LDPC/base station color code (binary convolutional code, BCC) as a placeholder, but OFDM modulation is required, and the FEC output bits and post FEC padding go through After modulation, the data field (data field) is obtained; after the data field (that is, the effective PPDU) is sent, an additional PE padding field of a certain length can be added. The PE padding field does not need to be coded and modulated by the physical layer, and is used by the physical layer. Arbitrary sequence constructs. When receiving the first PPDU, the receiving end can infer the length of post FEC padding according to the pre-FEC padding factor (pre-FEC padding factor) information in HE-SIG-A or EHT-SIG; according to the PPE threshold present (PPE threshold present) field and the length of the nominal packet padding (nominal packet padding) field to infer the length of the PE; according to the length of the L-length (L-length) to infer the length of the data field (that is, valid data), after receiving the data field (also That is valid data) after the last bit, check the data and generate an immediate response frame. Among them, the length of post FEC padding is not fixed and is related to the length of the data to be sent.

Among them, the maximum length of PE is 16us/20us. In this way, an additional 16us/20us processing delay can be obtained for the receiving end.

In some possible embodiments, in the above S601, during the process of generating the first PPDU at the sending end, the sending end may not perform MAC padding or PE padding on the first PPDU, which can improve transmission efficiency.

In some possible embodiments, the communication method provided in the embodiment of the present application may be applicable to the following two scenarios.

In the first scenario, a sender communicates with a receiver.

Referring to FIG. 4 above, take the communication between AP1 and STA1 as an example, AP1 is the sending end, and STA1 is the receiving end. AP1 may use S601 to generate a first PPDU, where a frame header of the first PPDU carries a first field, and the first field is used to indicate that an immediate response frame is fed back. AP1 sends the first PPDU to STA1 (as in S602 above).

STA1 analyzes the first PPDU from AP1 and determines that the first field in the frame header of the first PPDU indicates an immediate response frame, and can generate the second field in the second PPDU. The specific implementation process can refer to the above S603-S604 .

STA1 can further analyze the MPDU of the first PPDU, generate an immediate response frame based on the MPDU, and generate the third field in the second PPDU based on the immediate response frame. For the specific implementation process, refer to the above S605-S607.

STA1 may send the second PPDU to AP1, that is, send the second field and the third field of the second PPDU to AP1 in sequence, wherein the transmission power of the second field is determined by STA1, for example, the transmission power is determined to be the maximum power, the second The transmission bandwidth of the second field is the transmission bandwidth indicated by the BW of the frame header of the first PPDU. For example, the transmission bandwidth indicated by the BW of the frame header of the first PPDU is 20MHz, then the transmission bandwidth of the second field is 20MHz, that is, the transmission bandwidth of the first PPDU The sending bandwidth of the second field may be the same as the sending bandwidth of the first PPDU. The transmission power of the third field may be determined by STA1, and the transmission bandwidth of the third field may be the transmission bandwidth indicated by the BW of the frame header of the first PPDU, and the specific implementation process may refer to the above S608.

AP1 may determine the receiving result of the MPDU in the first PPDU according to the third field, as in S609 above.

Wherein, it should be noted that, in the first scenario, the sending end may be an AP or an STA, and the receiving end may be an AP or an STA, which is not limited in this application.

In the second scenario, one sender communicates with multiple receivers, the sender is an AP, and the multiple receivers are STAs.

Referring to the above FIG. 4 , it is taken as an example that AP1 communicates with STA1 ~ STA3 respectively, AP1 is the sending end, and STA1 ~ STA3 are receiving ends. AP1 can use S601 to generate the first PPDU, as shown in Figure 14, the frame header of the first PPDU can carry the first field, the first field is used to indicate that STA1~STA3 need to feed back the immediate response frame, and, in the first PPDU The PPDU also includes A-MPDUs sent to STA1-STA3 respectively. AP1 sends the first PPDU to STA1-STA3 (such as S602 above). STA1~STA3 need to analyze the first PPDU and feed back an immediate response frame to AP1. As shown in Figure 15, STA1~STA3 feed back the second PPDU to AP1 in OFDMA transmission mode, and the second PPDU replied by STA1~STA3 Both include an immediate response frame (BA frame in FIG. 15 ). The process is explained below by taking STA2 as an example. It can be understood that the execution process of STA1 and STA3 can refer to the execution process of STA2.

For STA2, STA2 can analyze the first PPDU from AP1, and when it is determined that the first field in the frame header of the first PPDU indicates that STA2 feeds back an immediate response frame, it can generate the second field in the second PPDU and send it to AP1 For the second field, the specific implementation process can refer to the above S603-S604.

STA2 can further analyze the A-MPDU of the first PPDU, generate an immediate response frame based on the A-MPDU, and generate the third field in the second PPDU based on the immediate response frame. For specific implementation processes, refer to the above S605-S607.

STA2 may send the second PPDU to AP1, that is, send the second field and the third field of the second PPDU to AP1 in sequence, where the transmission power of the second field may be determined by STA2, for example, determine that the transmission power is the maximum power, The transmission bandwidth of the second field is indicated by the BW field and RU allocation field of the frame header of the first PPDU. For example, the transmission bandwidth indicated by the BW of the frame header of the first PPDU is 26-tone RU 1, then the transmission bandwidth of the second field It is 20MHz where 26-tone RU 1 is located. The transmission bandwidth of the third field can be indicated by the RU allocation field in the MPDU contained in the first PPDU. For example, the transmission bandwidth of the third field is indicated by the RU allocation field in the Trigger frame, or by the RU in the TRS control field in the MPDU The allocation field indicates that the transmission power of the third field can be indicated by the TRS Control field or the Trigger frame in the A-MPDU. Wherein, the value indicated by the RU allocation field in the MPDU is the same as the value indicated by the RU allocation field in the frame header of the first PPDU, and the specific implementation process can refer to the above S608.

AP1 may determine the receiving result of the A-MPDU in the first PPDU according to the third field, as in S609 above.

It can be understood that the second scenario is a downlink OFDMA scenario, and each STA does not use MU-MIMO.

In the above-mentioned embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspectives of the receiving end and the sending end respectively. In order to realize the various functions in the method provided by the above embodiments of the present application, the receiving end and the transmitting end may include a hardware structure and a software module, and realize the above-mentioned functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. A certain function among the above-mentioned functions may be implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module.

Please refer to FIG. 16 . FIG. 16 is a schematic diagram of modules of a communication device provided by an embodiment of the present application. The communication device 1600 may include a processing module 1601 and a transceiver module 1602 . The processing module 1601 of the communication device 1600 may be a processor, and the transceiver module 1602 of the communication device 1600 may be a transceiver.

As a possible implementation manner, the communications apparatus 1600 may be a receiving end. The communication device 1600 may be, for example, an access point or a station, or the communication device is deployed at an access point or a station.

Wherein, the transceiver module 1602 is configured to receive the first PPDU. The processing module 1601 is configured to parse the frame header of the first PPDU, where the frame header includes a first field, and the first field is used to indicate that an immediate response frame is fed back.

In some possible designs, the processing module 1601 is also configured to parse the MPDU in the first PPDU. The processing module 1601 is further configured to generate an immediate response frame according to the MPDU, where the immediate response frame is used to indicate a receiving result of the MPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the processing module 1601 is further configured to generate the second field in the second PPDU according to the first field in the frame header of the first PPDU, where the second field includes L-STF and L-LTF; or, The processing module 1601 is further configured to generate a second PPDU according to the first field in the frame header of the first PPDU, where the second PPDU includes the second field.

Optionally, the immediate response frame is carried in the second PPDU.

As another possible implementation manner, the communications apparatus 1600 may be a sending end. The communication device 1600 may be, for example, an access point or a station, or the communication device is deployed at an access point or a station.

Wherein, the processing module 1601 is configured to generate the first PPDU. Wherein, the frame header of the first PPDU includes a first field, and the first field is used to indicate that an immediate response frame is fed back. A transceiver module 1602, configured to send the first PPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the transceiver module 1602 is also configured to receive a second PPDU, the second PPDU includes a second field and a third field, the second field includes L-STF and L-LTF, and the third field includes an immediate response frame .

Further, the processing module 1601 is further configured to determine the receiving result of the MPDU in the first PPDU according to the second PPDU.

For the relevant content of the foregoing communication device embodiments, reference may be made to the relevant content of the foregoing method embodiments. No more details here.

Please refer to Figure 17, Figure 17 is a block diagram of another communication device provided by the embodiment of the present application, the communication device 1700 includes a physical frame generation module 1703, a physical frame demodulation module 1704, a radio frequency transmission link module 1705 and a radio frequency A link module 1706 , a MAC frame generating module 1701 and a MAC frame receiving module 1702 . The physical frame generation module 1703, the physical frame demodulation module 1704, the radio frequency transmission link module 1705, and the radio frequency reception link module 1706 are used to realize the PHY function, and the MAC frame generation module 1701 and the MAC frame reception module 1702 are used to realize the MAC layer function.

As a possible implementation, the radio frequency receiving link module 1706 is configured to receive the first PPDU; the physical frame demodulation module 1704 is configured to parse the frame header of the first PPDU, the frame header includes a first field, the first PPDU One field is used to indicate feedback immediate response frame.

In some possible designs, the MAC frame receiving module 1702 is configured to parse the MPDU in the first PPDU. The MAC frame generating module 1701 is configured to generate an immediate response frame according to the MPDU, and the immediate response frame is used to indicate the receiving result of the MPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the physical frame generation module 1703 is configured to generate the second field in the second PPDU according to the first field in the frame header of the first PPDU, where the second field includes L-STF and L-LTF; or , a physical frame generating module 1703, configured to generate a second PPDU according to the first field in the frame header of the first PPDU, where the second PPDU includes the second field.

Optionally, the immediate response frame is carried in the second PPDU.

As another possible implementation manner, the MAC frame generating module 1701 and the physical frame generating module 1703 are configured to generate the first PPDU. Wherein, the frame header of the first PPDU includes a first field, and the first field is used to indicate that an immediate response frame is fed back. The radio frequency sending link module 1705 is configured to send the first PPDU.

Optionally, the second PPDU may also include L-STF and L-LTF.

In some possible designs, the radio frequency receiving link module 1706 is configured to receive the second PPDU, the second PPDU includes a second field and a third field, the second field includes L-STF and L-LTF, and the third field includes immediate response frame.

Further, the physical frame demodulation module 1704 is configured to parse the second PPDU; the MAC frame receiving module 1702 is configured to determine a receiving result of the MPDU in the first PPDU according to the MPDU in the second PPDU.

For ease of description, refer to FIG. 18 . FIG. 18 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The communication device 1800 includes a processor 1801 and a transceiver 1802 . The communication device 1800 may be the first MLD or the second MLD, or a chip therein. FIG. 18 shows only the main components of the communication device 1800 . In addition to the processor 1801 and the transceiver 1802, the communication device may further include a memory 1803 and an input and output device (not shown in the figure).

Wherein, the processor 1801 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process data of the software programs. The memory 1803 is mainly used to store software programs and data. The transceiver 1802 may include a radio frequency circuit and an antenna, and the radio frequency circuit is mainly used for converting a baseband signal to a radio frequency signal and processing the radio frequency signal. Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.

Wherein, the processor 1801, the transceiver 1802, and the memory 1803 may be connected through a communication bus.

When the communication device is turned on, the processor 1801 can read the software program in the memory 1803, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1801 performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1801, and the processor 1801 converts the baseband signal into data and processes the data deal with.

In another implementation, the radio frequency circuit and the antenna can be set independently from the processor for baseband processing. For example, in a distributed scenario, the radio frequency circuit and antenna can be arranged remotely from the communication device. . The present application also provides a chip, which can realize the functions of any one of the above method embodiments by executing computer programs or instructions.

A communication device may be a stand-alone device or may be part of a larger device. For example the communication device may be:

(1) Stand-alone integrated circuits ICs, or chips, or chip systems or subsystems;

(2) A set of one or more ICs, optionally, the set of ICs may also include storage components for storing data and instructions;

(3) ASIC, such as modem (Modem);

(4) Modules that can be embedded in other devices;

(5) Receivers, smart terminals, wireless devices, handsets, mobile units, vehicle-mounted devices, cloud devices, artificial intelligence devices, etc.;

(6) Others and so on.

When the specific implementation of the communication device in the embodiment of the present application is a chip, the chip can be implemented by a processor, and the processor can be used to perform, for example but not limited to, baseband-related processing, and the chip can also include a transceiver, the transceiver Transceivers may be used to perform, for example but not limited to, radio frequency transceiving. The above-mentioned devices may be respectively arranged on independent chips, or at least partly or all of them may be arranged on the same chip. For example, processors can be further divided into analog baseband processors and digital baseband processors. Wherein, the analog baseband processor can be integrated with the transceiver on the same chip, and the digital baseband processor can be set on an independent chip. With the continuous development of integrated circuit technology, more and more devices can be integrated on the same chip. For example, a digital baseband processor can be combined with a variety of application processors (such as but not limited to graphics processors, multimedia processors, etc.) integrated on the same chip. Such a chip can be called a system chip (system on chip). Whether each device is independently arranged on different chips or integrated and arranged on one or more chips often depends on the specific needs of product design. The embodiment of the present invention does not limit the specific implementation forms of the foregoing devices.

The present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer-readable storage medium is executed by a computer, the functions of any one of the above method embodiments are realized.

The present application also provides a computer program product, which implements the functions of any one of the above method embodiments when executed by a computer.

The present application also provides a chip or a chip system. The chip or system-on-a-chip includes processing logic circuits and interface circuits. Wherein, the number of processing logic circuits may be one or more, and the number of interface circuits may be one or more. Wherein, the interface circuit is used to receive code instructions and transmit them to the processing logic circuit. The processing logic circuit is configured to run the above-mentioned code instructions to realize the functions of any one of the above-mentioned method embodiments.

Optionally, the chip may include a memory, and the memory may be integrated with the processing logic circuit or set separately. The memory may be used to store computer programs and/or data involved in any of the above method embodiments.

In this application, the chip or the chip system may be located at the receiving end or the transmitting end, and may be located in an AP in a communication system or an STA. Wherein, when the chip is located at the receiving end, it is used to realize the functions of the receiving end in any of the above method embodiments, and when the chip is located at the sending end, it is used to realize the functions of the sending end in any of the above method embodiments.

The terms "first", "second" and "third" in the specification and claims of the present application and the above drawings are used to distinguish different objects, rather than to limit a specific order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations or illustrations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete manner.

"Multiple" means two or more than two, and other quantifiers are similar. "And/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. Furthermore, the singular forms "a", "an" and "the" do not mean "one or only one" but "one or more" unless the context clearly dictates otherwise. in one". For example, "a device" means reference to one or more such devices. Furthermore, at least one (at least one of)......." means one or any combination of subsequent associated objects, such as "at least one of A, B and C" includes A, B, C, AB, AC, BC, or ABC.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (random access memory, RAM), flash memory, read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM) , PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or known in the art any other form of storage medium. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC can be located in a network device or a terminal device. Certainly, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media. Described usable medium can be magnetic medium, for example, floppy disk, hard disk, magnetic tape; It can also be optical medium, for example, digital video disc (digital video disc, DVD); It can also be semiconductor medium, for example, solid state drive (solid state drive) , SSD).

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

In this application, unless otherwise specified, the parts that are the same or similar among the various embodiments can be referred to each other. In the various embodiments in this application, and the various implementation methods/implementation methods/implementation methods in each embodiment, if there is no special description and logical conflict, different embodiments, and each implementation method/implementation method in each embodiment The terms and/or descriptions between implementation methods/implementation methods are consistent and can be referred to each other. Different embodiments, and the technical features in each implementation manner/implementation method/implementation method in each embodiment are based on their inherent Logical relationships can be combined to form new embodiments, implementation modes, implementation methods, or implementation methods. The following embodiments of the present application are not intended to limit the protection scope of the present application.

It is to be understood that references to "an embodiment" throughout the specification mean that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, various embodiments are not necessarily referring to the same embodiment throughout the specification. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments. It can be understood that in various embodiments of the present application, the serial numbers of the processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes no limitation.

Claims

A communication method, characterized in that the method comprises:

receiving a first physical layer protocol data unit PPDU;

Parsing the frame header of the first PPDU, where the frame header includes a first field, and the first field is used to indicate that an immediate response frame is fed back.
The method according to claim 1, wherein, after parsing the frame header of the first PPDU, the method further comprises:

Parsing the media access control MAC protocol data unit MPDU in the first PPDU;

The immediate response frame is generated according to the MPDU, and the immediate response frame is used to indicate a receiving result of the MPDU.
A communication method, characterized in that the method comprises:

Generate a first physical layer protocol data unit PPDU; the frame header of the first PPDU includes a first field, and the first field is used to indicate a feedback immediate response frame;

sending the first PPDU.
The method according to any one of claims 1-3, wherein the immediate response frame is carried in the second PPDU.
The method according to claim 4, wherein the second PPDU further includes a traditional short training field L-STF and a traditional long training field L-LTF.
The method according to claim 5, wherein the transmission bandwidth of the L-STF and the L-LTF is indicated by a bandwidth field of a frame header of the first PPDU.
The method according to any one of claims 1-6, wherein the immediate response frame includes any one of the following: acknowledgment ACK frame, block acknowledgment BA frame, negative acknowledgment NACK frame, empty data packet NDP BA frame , BA target wake-up time TWT frame, TWT ACK frame, short TWT ACK frame, quality of service QoS+ contention-free CF-ACK frame.
The method according to any one of claims 1-7, wherein the immediate response frame includes a type field, a subtype field and a control frame extension field.
The method according to any one of claims 1-8, wherein the first field is carried in any one of the following: the general signaling field U-SIG, the extremely high throughput signaling field EHT-SIG Public fields or user fields of the EHT-SIG.
A communication device, characterized in that the communication device includes: a processing module and a transceiver module;

The transceiver module is used to receive the first physical layer protocol data unit PPDU;

The processing module is configured to parse the frame header of the first PPDU, where the frame header includes a first field, and the first field is used to indicate a feedback immediate response frame.
The device according to claim 10, wherein the processing module is further configured to parse the Media Access Control MAC Protocol Data Unit (MPDU) in the first PPDU;

The processing module is further configured to generate the immediate response frame according to the MPDU, and the immediate response frame is used to indicate a receiving result of the MPDU.
A communication device, characterized in that the communication device includes: a processing module and a transceiver module;

The processing module is configured to generate a first physical layer protocol data unit PPDU; the frame header of the first PPDU includes a first field, and the first field is used to indicate a feedback immediate response frame;

The transceiver module is configured to send the first PPDU.
The device according to any one of claims 10-12, wherein the immediate response frame is carried in the second PPDU.
The device according to claim 13, wherein the second PPDU further includes a traditional short training field L-STF and a traditional long training field L-LTF.
The device according to claim 14, wherein the transmission bandwidth of the L-STF and the L-LTF is indicated by a bandwidth field of a frame header of the first PPDU.
The device according to any one of claims 10-15, wherein the immediate response frame includes any one of the following: acknowledgment ACK frame, block acknowledgment BA frame, negative acknowledgment NACK frame, empty data packet NDP BA frame , BA target wake-up time TWT frame, TWT ACK frame, short TWT ACK frame, quality of service QoS+ contention-free CF-ACK frame.
The device according to any one of claims 10-16, wherein the immediate response frame includes a type field, a subtype field and a control frame extension field.
The device according to any one of claims 10-17, wherein the first field is carried in any one of the following: the general signaling field U-SIG, the extremely high throughput signaling field EHT-SIG Common field or user field of the very high throughput signaling field EHT-SIG.
A communication device, characterized by comprising: a processor and a transceiver, and when the processor executes a computer program or an instruction in a memory, the method described in any one of claims 1-9 is executed.
A computer-readable storage medium, wherein computer instructions are stored in the computer-readable storage medium, and the computer instructions instruct a communication device to execute the method according to any one of claims 1-9.
A computer program product, characterized in that the computer program product includes instructions, and when the instructions are executed by a processor, the method according to any one of claims 1-9 is executed.
A chip, characterized in that the chip includes a logic circuit and an interface circuit, and when the logic circuit executes the computer program or instructions in the memory, the method described in any one of claims 1-9 is executed.