Communication methods and communication devices

Abstract

This application relates to the field of communications, and more particularly to PPDU transmission methods and communication devices. The solution may be applied to WLAN systems supporting next-generation Wi-Fi protocols of IEEE 802.11ax, such as 802.11be, Wi-Fi 7, or EHT, or, as another example, next-generation 802.11be protocols such as Wi-Fi 8, and may be further applied to UWB-based wireless personal area network systems and sensing systems. In the method, the ratio of the subcarrier spacing for transmitting the first part of the first PPDU to the subcarrier spacing for transmitting the first part of the second PPDU is different from the ratio of the subcarrier spacing for transmitting the second part of the first PPDU to the subcarrier spacing for transmitting the second part of the second PPDU, so that the first and second PPDUs are transmitted at high and low frequencies, respectively. In this way, the high-frequency PPDU has better transmission performance.

Description

Technical Field

[0001]

[0001] This application claims priority to Chinese Patent Application No. 202310286630.9, titled "Communication Method and Communication Device", filed with the China National Intellectual Property Administration on March 15, 2023, the entire content of which is incorporated herein by reference.

[0002]

[0002] Technical Field This application relates to the field of communication technologies, and more particularly, to communication methods and communication devices.

Background Art

[0003]

[0003] Wireless Local Area Network (WLAN) has gone through many generations in development, including low-frequency communication standards operating below 7 GHz such as 802.11a / b / g, 802.11n, 802.11ac, 802.11ax, and 802.11be, and further including high-frequency communication standards such as 802.11ad and 802.11ay operating near 60 GHz.

[0004]

[0004] Currently, in WLAN low-frequency communication, the Physical Layer Protocol Data Unit (PPDU) can be transmitted by using Orthogonal Frequency Division Multiplexing (OFDM) technology. In high-frequency communication, the preamble part of the PPDU is modulated and transmitted in single carrier (SC) mode, and only the fields after the preamble are transmitted by using OFDM technology. This achieves advantages such as a low peak-to-average power ratio (PAPR), phase noise suppression, and the like.

[0005]

[0005] However, the transmission mode in which both SC and OFDM are used in PPDU also has several drawbacks: for example, the modulation scheme in PPDU is not standardized or compatible with the low-frequency PPDU format. This does not lead to the reception and transmission of PPDU by devices. [Overview of the project]

[0006]

[0006] This application provides a communication method and communication apparatus that enable all PPDUs in high-frequency communication to be transmitted in OFDM mode, and facilitate the reception and transmission of PPDUs by devices. Furthermore, different requirements for different parts of high-frequency PPDUs with respect to subcarrier spacing can be satisfied, thereby achieving better transmission performance.

[0007]

[0007] According to a first aspect, a communication method is provided. The method may be performed by a first station or by components (e.g., chips, circuits, or modules) constructed in the first station. This is not limited to the present application.

[0008]

[0008] The method includes: generating a first physical layer protocol data unit (PPDU), the first PPDU comprising a first part and a second part, the first part of the first PPDU being positioned before the second part of the first PPDU in a frame format; and transmitting the first part of the first PPDU by using subcarriers in a first subcarrier interval and transmitting the second part of the first PPDU by using subcarriers in a second subcarrier interval.

[0009]

[0009] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0010]

[0010] The first PPDU is transmitted in the first frequency band. The second PPDU is transmitted in the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0011]

[0011] According to the above solution, both the subcarrier spacing between subcarriers for transmitting the first part of the first PPDU and the subcarrier spacing between subcarriers for transmitting the second part of the first PPDU are defined. Thus, both the first and second parts of the first PPDU are transmitted in OFDM mode, and it becomes possible to avoid using a hybrid transmission mode of SC and OFDM.

[0012]

[0012] Furthermore, it is possible to satisfy the different requirements of different parts of the first PPDU regarding subcarrier spacing and achieve better transmission performance.

[0013]

[0013] According to the first embodiment, in a partial implementation of the first embodiment, the first part of the first PPDU is transmitted repeatedly on the basic channel element of the first frequency band.

[0014]

[0014] Optionally, the first part of the first PPDU is transmitted repeatedly on the basic channel element of the first frequency band, which includes transmitting the first part of the first PPDU multiplied by a coefficient on the basic channel element.

[0015]

[0015] For example, the sequence to be transmitted repeatedly may be obtained by multiplying the initially transmitted sequence by a coefficient, for example, +1, -1, j, or -j. This can achieve phase rotation and reduce the peak-to-average power ratio (PAPR, abbreviated as peak-to-average ratio).

[0016]

[0016] According to the above solution, the frequency domain widths of different parts of the first PPDU may be the same throughout repeated transmission. This facilitates the reception and transmission of the PPDU by the device.

[0017]

[0017] With respect to the first embodiment, in some implementations of the first embodiment, the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU.

[0018]

[0018] With respect to the first embodiment, in a partial implementation of the first embodiment, the first part of the second PPDU is used to correct the carrier frequency offset.

[0019]

[0019] With respect to the first embodiment, in a partial implementation of the first embodiment, the first part of the first PPDU is used to correct the carrier frequency offset.

[0020]

[0020] In one example, the first part of the first PPDU includes a legacy short training field, which is used to correct the carrier frequency offset.

[0021]

[0021] According to the above solution, the high-frequency PPDU may be designed based on an existing low-frequency PPDU. This is simple and efficient.

[0022]

[0022] As an option, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0023]

[0023] In yet another example, the first part of the first PPDU includes a new field, and the new field is used to correct the carrier frequency offset.

[0024]

[0024] As an option, the second part of the first PPDU includes a legacy short training field.

[0025]

[0025] As an option, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is less than or equal to the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0026]

[0026] Regarding the first aspect, in some implementations of the first aspect, the frequency domain sequence of the legacy short training field in the first PPDU is different from the frequency domain sequence of the legacy short training field in the second PPDU.

[0027]

[0027] Regarding the first aspect, in some implementations of the first aspect, the second part of the first PPDU includes a data field.

[0028]

[0028] Regarding the first aspect, in some implementations of the first aspect, the second part of the second PPDU includes a data field.

[0029]

[0029] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0030]

[0030] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0031]

[0031] With respect to the first embodiment, in a partial implementation of the first embodiment, x is subject to the following conditions:

number

[0032]

[0032] With respect to the first embodiment, in some implementations of the first embodiment, the method may further include the steps of: transmitting a first part of a third PPDU by using a subcarrier in a first subcarrier interval, and transmitting a second part of the third PPDU by using a subcarrier in a fifth subcarrier interval.

[0033]

[0033] The first subcarrier interval is x times the third subcarrier interval, the fifth subcarrier interval is z times the fourth subcarrier interval, and y is not equal to z.

[0034]

[0034] The third PPDU is transmitted in the first frequency band.

[0035]

[0035] In other words, multiple PPDUs having different subcarrier intervals may be transmitted in the first frequency band.

[0036]

[0036] Optionally, the relationship between x and z is not limited in this application, and x and z may be equal or not.

[0037]

[0037] With respect to the first embodiment, in some implementations of the first embodiment, the method may include the step of transmitting first information, where the first information represents the values ​​of x and y.

[0038]

[0038] With respect to the first embodiment, in some implementations of the first embodiment, the method may further include the step of transmitting second information, where the second information represents the values ​​of x and z.

[0039]

[0039] Specifically, capability negotiation can be performed between the transmitting end device and the receiving end device to determine the format of the high-frequency PPDU or to negotiate the format in which the high-frequency PPDU should be used.

[0040]

[0040] According to a second aspect, a communication method is provided. The method may be performed by a second station or by a component (e.g., a chip, circuit, or module) constructed in the second station. This is not limited to the present application.

[0041]

[0041] The method includes the steps of: receiving a first part of a first PPDU by using a subcarrier in a first subcarrier interval; receiving a second part of a first PPDU by using a subcarrier in a second subcarrier interval; and parsing the first PPDU.

[0042]

[0042] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the first PPDU is located before the second part of the first PPDU in the frame format. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0043]

[0043] The first PPDU is transmitted in the first frequency band. The second PPDU is transmitted in the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0044]

[0044] According to a second embodiment, in a partial implementation of the second embodiment, the first part of the first PPDU is transmitted repeatedly on the basic channel element of the first frequency band.

[0045]

[0045] Optionally, the first part of the first PPDU is transmitted repeatedly on the basic channel element of the first frequency band, which includes transmitting the first part of the first PPDU multiplied by a coefficient on the basic channel element.

[0046]

[0046] With respect to a second embodiment, in some implementations of the second embodiment, the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU.

[0047]

[0047] In a second embodiment, in a partial implementation of the second embodiment, the first part of the second PPDU is used to correct the carrier frequency offset.

[0048]

[0048] In a second embodiment, in a partial implementation of the second embodiment, the first part of the first PPDU is used to correct the carrier frequency offset.

[0049]

[0049] In one example, the first part of the first PPDU includes a legacy short training field, which is used to correct the carrier frequency offset.

[0050]

[0050] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0051]

[0051] In yet another example, the first part of the first PPDU includes a new field which is used to correct the carrier frequency offset.

[0052]

[0052] Optionally, the second part of the first PPDU includes a legacy short training field.

[0053]

[0053] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is less than or equal to the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0054]

[0054] With respect to a second embodiment, in some implementations of the second embodiment, the frequency domain sequence of the legacy short training field in the first PPDU is different from the frequency domain sequence of the legacy short training field in the second PPDU.

[0055]

[0055] With respect to a second embodiment, in a partial implementation of the second embodiment, the second part of the first PPDU includes a data field.

[0056]

[0056] With respect to a second embodiment, in a partial implementation of the second embodiment, the second part of the second PPDU includes a data field.

[0057]

[0057] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0058]

[0058] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0059]

[0059] With respect to the second embodiment, in a partial implementation of the second embodiment, x is subject to the following conditions:

number

[0060]

[0060] With respect to a second embodiment, in some implementations of the second embodiment, the method may further include the steps of: receiving a first part of a third PPDU by using a subcarrier in a first subcarrier interval, and receiving a second part of the third PPDU by using a subcarrier in a fifth subcarrier interval.

[0061]

[0061] The first subcarrier interval is x times the third subcarrier interval, the fifth subcarrier interval is z times the fourth subcarrier interval, and y is not equal to z.

[0062]

[0062] The third PPDU is transmitted in the first frequency band.

[0063]

[0063] In other words, multiple PPDUs having different subcarrier intervals may be transmitted in the first frequency band.

[0064]

[0064] Optionally, the relationship between x and z is not limited in this application, and x and z may be equal or not.

[0065]

[0065] With respect to a second aspect, in some implementations of the second aspect, the method may include the step of receiving first information, where the first information represents the values ​​of x and y.

[0066]

[0066] With respect to a second aspect, in some implementations of the second aspect, the method may further include the step of receiving second information, where the second information represents the values ​​of x and z.

[0067]

[0067] Specifically, capability negotiation can be performed between the transmitting end device and the receiving end device to determine the format of the high-frequency PPDU or to negotiate the format in which the high-frequency PPDU should be used.

[0068]

[0068] It should be understood that, for the beneficial effects of the second aspect and the implementation of the second aspect, it is possible to refer to the beneficial effects of the first aspect and the implementation of the first aspect. Further details will not be explained here again.

[0069]

[0069] According to a third aspect, a communication method is provided. The method may be performed by a first station or by a component (e.g., a chip, circuit, or module) constructed in the first station. This is not limited to the present application.

[0070]

[0070] The method includes: generating a first PPDU, wherein the number of symbols occupied by a first field in the first PPDU in the time domain is greater than the number of symbols occupied by a second field in the second PPDU in the time domain, the first PPDU includes a first field which is used to correct a carrier frequency offset, and the second PPDU includes a second field which is used to correct a carrier frequency offset; and transmitting the first PPDU.

[0071]

[0071] The first PPDU is transmitted in the first frequency band, and the second PPDU is transmitted in the second frequency band.

[0072]

[0072] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0073]

[0073] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0074]

[0074] For example, the first field is the Legacy Short Training Field.

[0075]

[0075] For example, the second field is the Legacy Short Training Field.

[0076]

[0076] According to the above solution, more symbols of the first field are transmitted in the time domain, and as a result, the receiving end can have more symbols to correct the carrier frequency offset, thereby improving the offset correction accuracy.

[0077]

[0077] According to a fourth aspect, a communication method is provided. The method may be performed by a second station or by a component (e.g., a chip, circuit, or module) constructed in the second station. This is not limited to the present application.

[0078]

[0078] The method includes: receiving a first PPDU, wherein the number of symbols occupied by a first field in the first PPDU in the time domain is greater than the number of symbols occupied by a second field in the second PPDU in the time domain, the first PPDU includes a first field which is used to correct a carrier frequency offset, and the second PPDU includes a second field which is used to correct a carrier frequency offset; and analyzing the first PPDU.

[0079]

[0079] The first PPDU is transmitted in the first frequency band, and the second PPDU is transmitted in the second frequency band.

[0080]

[0080] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0081]

[0081] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0082]

[0082] For example, the first field is the Legacy Short Training Field.

[0083]

[0083] For example, the second field is the Legacy Short Training Field.

[0084]

[0084] According to the above solution, more symbols of the first field are transmitted in the time domain, and as a result, the receiving end can have more symbols to correct the carrier frequency offset, thereby improving the offset correction accuracy.

[0085]

[0085] According to a fifth aspect, a communication device is provided. The device may be a first station or a component (e.g., a chip, circuit, or module) constructed in the first station. This is not limited to the present application.

[0086]

[0086] The apparatus includes: a processing unit configured to generate a first PPDU, the first PPDU comprising a first part and a second part, the first part of the first PPDU being located before the second part of the first PPDU in a frame format; and a transceiver unit configured to transmit the first part of the first PPDU by using subcarriers at a first subcarrier interval and the second part of the first PPDU by using subcarriers at a second subcarrier interval.

[0087]

[0087] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0088]

[0088] The first PPDU is transmitted in the first frequency band. The second PPDU is transmitted in the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0089]

[0089] According to the fifth embodiment, in a partial implementation of the fifth embodiment, the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band.

[0090]

[0090] Optionally, the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band, which includes transmitting the first part of the first PPDU multiplied by a coefficient in the basic channel element.

[0091]

[0091] With respect to the fifth embodiment, in some implementations of the fifth embodiment, the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU.

[0092]

[0092] With respect to a fifth embodiment, in some implementations of the fifth embodiment, the first part of the second PPDU is used to correct the carrier frequency offset.

[0093]

[0093] With respect to a fifth embodiment, in a partial implementation of the fifth embodiment, the first part of the first PPDU is used to correct the carrier frequency offset.

[0094]

[0094] In one example, the first part of the first PPDU includes a legacy short training field, which is used to correct the carrier frequency offset.

[0095]

[0095] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0096]

[0096] In yet another example, the first part of the first PPDU includes a new field which is used to correct the carrier frequency offset.

[0097]

[0097] Optionally, the second part of the first PPDU includes a legacy short training field.

[0098]

[0098] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is less than or equal to the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0099]

[0099] With respect to the fifth aspect, in some implementations of the fifth aspect, the frequency domain sequence of the legacy short training field in the first PPDU is different from the frequency domain sequence of the legacy short training field in the second PPDU.

[0100]

[0100] With respect to the fifth aspect, in a partial implementation of the fifth aspect, the second part of the first PPDU includes a data field.

[0101]

[0101] With respect to the fifth aspect, in a partial implementation of the fifth aspect, the second part of the second PPDU includes a data field.

[0102]

[0102] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0103]

[0103] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0104]

[0104] With respect to the fifth aspect, in a partial implementation of the fifth aspect, x is subject to the following conditions:

number

[0105]

[0105] With respect to a fifth embodiment, in some implementations of the fifth embodiment, the transceiver unit is further configured to transmit a first part of a third PPDU by using a subcarrier at a first subcarrier interval and a second part of the third PPDU by using a subcarrier at a fifth subcarrier interval.

[0106]

[0106] The first subcarrier interval is x times the third subcarrier interval, the fifth subcarrier interval is z times the fourth subcarrier interval, and y is not equal to z.

[0107]

[0107] The third PPDU is transmitted in the first frequency band.

[0108]

[0108] With respect to a fifth aspect, in some implementations of the fifth aspect, the transceiver unit is further configured to transmit first information, where the first information is a value of x and y.

[0109]

[0109] With respect to a fifth aspect, in some implementations of the fifth aspect, the transceiver unit is further configured to transmit second information, where the second information is the values ​​of x and z.

[0110]

[0110] According to a sixth aspect, a communication device is provided. The device may be a second station or a component (e.g., a chip, circuit, or module) constructed in the second station. This is not limited to the present application.

[0111]

[0111] The apparatus includes: a transceiver unit configured to receive a first part of a first PPDU by using subcarriers in a first subcarrier interval and a second part of the first PPDU by using subcarriers in a second subcarrier interval; and a processing unit configured to analyze the first PPDU.

[0112]

[0112] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0113]

[0113] The first PPDU is transmitted in the first frequency band. The second PPDU is transmitted in the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0114]

[0114] According to the sixth embodiment, in a partial implementation of the sixth embodiment, the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band.

[0115]

[0115] Optionally, the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band, which includes transmitting the first part of the first PPDU multiplied by a coefficient in the basic channel element.

[0116]

[0116] With respect to the sixth embodiment, in some implementations of the sixth embodiment, the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU.

[0117]

[0117] With respect to the sixth embodiment, in a partial implementation of the sixth embodiment, the first part of the second PPDU is used to correct the carrier frequency offset.

[0118]

[0118] With respect to the sixth aspect, in a partial implementation of the sixth aspect, the first part of the first PPDU is used to correct the carrier frequency offset.

[0119]

[0119] In one example, the first part of the first PPDU includes a legacy short training field, which is used to correct the carrier frequency offset.

[0120]

[0120] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0121]

[0121] In yet another example, the first part of the first PPDU includes a new field, which is used to correct the carrier frequency offset.

[0122]

[0122] Optionally, the second part of the first PPDU includes a legacy short training field.

[0123]

[0123] Optionally, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is less than or equal to the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0124]

[0124] With respect to the sixth aspect, in some implementations of the sixth aspect, the frequency domain sequence of the legacy short training field in the first PPDU is different from the frequency domain sequence of the legacy short training field in the second PPDU.

[0125]

[0125] With respect to the sixth aspect, in a partial implementation of the sixth aspect, the second part of the first PPDU includes a data field.

[0126]

[0126] With respect to the sixth aspect, in a partial implementation of the sixth aspect, the second part of the second PPDU includes a data field.

[0127]

[0127] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0128]

[0128] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0129]

[0129] With respect to the sixth aspect, in a partial implementation of the sixth aspect, x is subject to the following conditions:

number

[0130]

[0130] With respect to a sixth aspect, in some implementations of the sixth aspect, the transceiver unit is further configured to: receive a first part of a third PPDU by using a subcarrier at a first subcarrier interval, and receive a second part of the third PPDU by using a subcarrier at a fifth subcarrier interval.

[0131]

[0131] The first subcarrier interval is x times the third subcarrier interval, the fifth subcarrier interval is z times the fourth subcarrier interval, and y is not equal to z.

[0132]

[0132] The third PPDU is transmitted in the first frequency band.

[0133]

[0133] With respect to a sixth aspect, in some implementations of the sixth aspect, the transceiver unit is further configured to receive first information, where the first information represents the values ​​of x and y.

[0134]

[0134] With respect to a sixth aspect, in some implementations of the sixth aspect, the transceiver unit is further configured to receive second information, where the second information represents the values ​​of x and z.

[0135]

[0135] According to a seventh aspect, a communication device is provided. The device may be a first station or a component (e.g., a chip, circuit, or module) constructed in the first station. This is not limited to the present application.

[0136]

[0136] The apparatus includes: a processing module configured to generate a first PPDU, wherein the number of symbols occupied by a first field in the first PPDU in the time domain is greater than the number of symbols occupied by a second field in the second PPDU in the time domain, the first PPDU includes a first field which is used to correct a carrier frequency offset, and the second PPDU includes a second field which is used to correct a carrier frequency offset; and a transceiver unit configured to transmit the first PPDU.

[0137]

[0137] The first PPDU is transmitted in the first frequency band, and the second PPDU is transmitted in the second frequency band.

[0138]

[0138] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0139]

[0139] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0140]

[0140] According to the eighth aspect, a communication device is provided. The device may be a second station or a component (e.g., a chip, circuit, or module) constructed in the second station. This is not limited to the present application.

[0141]

[0141] Apparatus: A transceiver unit configured to receive a first PPDU, wherein the number of symbols occupied by a first field in the first PPDU in the time domain is greater than the number of symbols occupied by a second field in the second PPDU in the time domain, the first PPDU includes a first field which is used to correct a carrier frequency offset, and the second PPDU includes a second field which is used to correct a carrier frequency offset; and a processing unit configured to analyze the first PPDU.

[0142]

[0142] The first PPDU is transmitted in the first frequency band, and the second PPDU is transmitted in the second frequency band.

[0143]

[0143] For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0144]

[0144] For example, the highest frequency of the second frequency band is 7 GHz or less.

[0145]

[0145] According to the ninth aspect, a communication device is provided and includes a processor, the processor being configured to call and execute computer programs stored in memory, and to control transceivers to receive or transmit signals, thereby enabling the communication device to perform a method according to any one of the first to fourth aspects or any one of the possible implementations thereof. Optionally, the communication device may further include memory configured to store computer programs. The communication device may further include transceivers.

[0146]

[0146] According to the tenth aspect, a communication device is provided and includes a processor. The processor is configured to process data and / or information so that a method according to any one of the first to fourth aspects or any one of the possible implementations of these aspects can be performed. Optionally, the communication device may further include a communication interface. The communication interface is configured to receive data and / or information and to transmit the received data and / or information to the processor. Optionally, the communication interface is further configured to output data and / or information processed by the processor.

[0147]

[0147] According to the eleventh aspect, a chip is provided and includes a processor. The processor is configured to execute a program or instructions so that the chip can perform any one of the first to fourth aspects or any one of the possible implementations of these aspects. Optionally, the chip may further include memory, which is configured to store a program or instructions. Optionally, the chip may further include a transceiver.

[0148]

[0148] According to the twelfth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer instructions. The computer instructions are used to implement any one of the first to fourth aspects or any one of the possible implementations of these aspects.

[0149]

[0149] According to the thirteenth aspect, a computer program product is provided. The computer program product includes computer program code. The computer program code is used to carry out a method according to any one of the first to fourth aspects or any one of the possible implementations of these aspects.

[0150]

[0150] According to the 14th aspect, a wireless communication system is provided which includes an apparatus according to the 5th aspect and an apparatus according to the 6th aspect, or an apparatus according to the 7th aspect and an apparatus according to the 8th aspect. [Brief explanation of the drawing]

[0151] [Figure 1]

[0151] Figure 1 is a diagram of an application scenario to which the embodiments of this application can be applied. [Figure 2]

[0152] Figure 2 shows the communication device described in this application. [Figure 3]

[0153] Figure 3 shows the PPDU format in several low-frequency communication protocols. [Figure 4]

[0154] Figure 4 is a schematic flowchart of the communication method 200 according to the embodiment of the present application. [Figure 5]

[0155] Figure 5 shows the first PPDU format and the second PPDU format according to the embodiment of the present application. [Figure 6]

[0156] Figure 6 is another diagram of the first PPDU format and the second PPDU format according to the embodiment of the present application. [Figure 7]

[0157] Figure 7 is a schematic flowchart of the communication method 300 according to the embodiment of the present application. [Figure 8]

[0158] Figure 8 is a diagram of a communication device according to an embodiment of the present application. [Figure 9]

[0159] Figure 9 shows another structure of the communication device according to the embodiment of the present application. [Figure 10]

[0160] Figure 10 shows another structure of the communication device according to the embodiment of the present application. [Figure 11]

[0161] Figure 11 is a diagram of another structure of a communication device according to an embodiment of the present application. [Modes for carrying out the invention]

[0152]

[0162] The technical solution of this application will be explained below with reference to the attached drawings.

[0153]

[0163] The technical solutions provided in the embodiments of this application support wireless local area network (WLAN) scenarios, such as the 802.11a / b / g, 802.11n, 802.11ac, and 802.11ax standards of the Institute of Electrical and Electronics Engineers (IEEE), and next-generation Wi-Fi protocols such as IEEE 802.11be, Wi-Fi 7, and extremely high throughput (VHS). Applicable to next-generation standards of 802.11be, such as 802.11ad, 802.11ay, or 802.11bf, or, as another example, Wi-Fi 8; potentially applicable to ultra-wideband (UWB) based wireless personal area network systems, such as the 802.15 series standards; and potentially applicable to sensing systems, such as the 802.11bf series standards. The 802.11n standard is called high throughput (HT), the 802.11ac standard is called very high throughput (VHT), the 802.11ax standard is called high efficiency (HE), and 802.11be is called extremely high throughput (EHT). 802.11bf includes two main categories of standards: low-frequency (e.g., sub-7 GHz) standards and high-frequency (e.g., 60 GHz) standards. Sub-7 GHz implementations primarily rely on 802.11ac, 802.11ax, 802.11be, and next-generation standards. 60 GHz implementations primarily rely on 802.11ad, 802.11ay, and next-generation standards.802.11ad is sometimes called the directional multi-gigabit (DMG) standard, and 802.11ay is sometimes called the enhanced directional multi-gigabit (EDMG) standard.

[0154]

[0164] In the embodiments of this application, examples are used for illustrative purposes in which a WLAN network, in particular a network to which the IEEE 802.11 system standard applies, is deployed. However, it will be readily apparent to those skilled in the art that the various aspects of the embodiments of this application may be extended to other networks using various standards or protocols, such as high-performance radio local area networks (HIPERLAN), wireless wide area networks (WWAN), wireless personal area networks (WPAN), or other networks that are known or planned to be developed in the future. Accordingly, the various aspects provided in the embodiments of this application are applicable to any suitable wireless network, regardless of the coverage area used and the wireless access protocol used.

[0155]

[0165] The technical solutions in the embodiments of this application may be further applied to various communication systems, such as WLAN communication systems, wireless fidelity (Wi-Fi) systems, long-term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunications systems (UMTS), worldwide interoperability for microwave access (WiMAX) communication systems, 5th generation (5G) systems or new radio (NR) systems, future 6th generation (6G) systems, Internet of Things (IoT) networks, or vehicle-to-x (V2X) systems.

[0156]

[0166] The above-mentioned communication systems to which this application is applicable are merely illustrative examples, and are not limited to those to which this application is applicable. This is stated uniformly in this application and will not be explained again below.

[0157]

[0167] Figure 1 is a diagram illustrating application scenarios to which the embodiments of the present application can be applied. As shown in Figure 1, the communication method provided in the present application is applicable to data communication between stations (STAs). A station may be an access point (AP) station or a non-access point station (non-AP STA). Access point stations and non-access point stations are abbreviated as AP and non-AP stations, respectively. Specifically, the solution of the present application is applicable to data communication between an AP and one or more non-AP stations (e.g., data communication between AP1, non-AP STA1, and non-AP STA2), as well as to data communication between APs (e.g., data communication between AP1 and AP2), and data communication between non-AP STAs (e.g., data communication between non-AP STA2 and non-AP STA3).

[0158]

[0168] An access point may be a node that a device (e.g., a mobile phone) passes through when accessing a wired (or wireless) network, and may be primarily located in homes, buildings, or campuses, or naturally outdoors, with a typical coverage radius ranging from tens of meters to over 100 meters. An access point is equivalent to a bridge connecting a wired network and a wireless network, and is primarily intended to connect wireless network clients to each other and then connect wireless networks to Ethernet.

[0159]

[0169] Specifically, an access point may be a terminal or network device having a Wi-Fi chip. A network device may be a server, router, switch, bridge, computer, mobile phone, relay station, in-vehicle device, wearable device, network device in a 5G network, network device in a 6G network, network device in a public land mobile network (PLMN), or similar. This is not limited to the embodiments of this application. An access point may be a device that supports Wi-Fi standards. For example, an access point may alternatively support one or more of the following IEEE 802.11 series standards: 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11ad, and 802.11ay.

[0160]

[0170] A non-AP station may be a wireless communication chip, wireless sensor, wireless communication terminal, or similar, and may be referred to as a user, user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile console, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment. A non-AP station may be a mobile phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, Internet of Things device, wearable device, terminal device in a 5G network, terminal device in a 6G network, terminal device in a PLMN, or similar. This is not limited to the embodiments of this application. A non-AP station may be a device that supports the WLAN standard. For example, a non-AP station may support one or more of the following IEEE 802.11 series standards: 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11ad, and 802.11ay.

[0161]

[0171] For example, a non-AP station may be a mobile phone, tablet computer, set-top box, smart TV, smart wearable device, in-car communication device, computer, Internet of Things (IoT) node, sensor, smart home device (e.g., smart camera, smart remote control, or smart water / electricity meter), or sensor in a smart city.

[0162]

[0172] An AP or non-AP station may include a transmitter, receiver, memory, processor, and similar components. The transmitter and receiver are configured to transmit and receive packet structures, respectively. The memory is configured to store signaling information and pre-agreed preset values, among other things. The processor is configured to parse the signaling information and process related data, among other things.

[0163]

[0173] For example, Figure 2 shows a communication device according to the present application. The device shown in Figure 2 may be an AP or a non-AP station. A medium access control (MAC) layer processing module, a physical (PHY) layer processing module, a radio frequency / antenna, and similar components are configured to implement the associated functions of the transmitter and receiver described above. As shown in Figure 2, in addition to the MAC layer processing module, PHY layer processing module, radio frequency / antenna, memory, and processor, the device may further include a controller and a scheduler.

[0164]

[0174] It should be understood that Figure 2 merely illustrates an example of the apparatus provided in this application and does not constitute a limitation of this application. For example, the apparatus may, alternatively, not include a controller and / or scheduler.

[0165]

[0175] In orthogonal frequency division multiplexing (OFDM) technology, a frequency domain resource is divided into several sub-resources. Each sub-resource in the frequency domain is called a subcarrier. A subcarrier may be understood as the smallest granularity of the frequency domain resource. The frequency difference between adjacent subcarriers is called the subcarrier spacing. The solution of this application may be applicable to systems in which OFDM technology is used.

[0166]

[0176] Currently, in WLAN low-frequency communications, physical layer protocol data units (PPDUs) can be transmitted using OFDM technology.

[0167]

[0177] For example, Figure 3 shows the PPDU format in several low-frequency communication protocols. Figures 3(a), (b), and (c) show the PPDU format in the 802.11ac (i.e., VHT) protocol, the single-user (SU) PPDU format in the 802.11ax (HE) protocol, and the multi-user (MU) PPDU format in the 802.11be (EHT) protocol, respectively.

[0168]

[0178] As shown in Figure 3(a), VHT PPDU is Legacy Short Training Field (L-STF) Legacy Long Training Field (L-LTF) Legacy signal field (L-SIG), VHT signal A field (VHT-SIG-A) VHT Short Training Field (VHT-STF) VHT Long Training Field (VHT-LTF) VHT signal B field (VHT-signal B field, VHT-SIG-B), and Includes a Data field.

[0169]

[0179] As shown in Figure 3(b), HE SU PPDU is L-STF, L-LTF, L-SIG, Repeated legacy signal field (RL-SIG), HE signal A field (HE-SIG-A) HE Short Training Field (HE-STF) HE Long Training Field (HE-Long Training Field, HE-LTF) Data field, and Includes the packet extension (PE) field.

[0170]

[0180] As shown in Figure 3(c), EHT MU PPDU is L-STF, L-LTF, L-SIG, RL-SIG, Universal signal field (U-SIG), EHT Short Training Field (EHT-STF) EHT Long Training Field (EHT-LTF) Data field, and Includes the packet extension (PE) field.

[0171]

[0181] It should be understood that Figure 3 is just one example. The PPDU format in other low-frequency communication protocols is basically the same as that in Figure 3, and the PPDU basically includes legacy preambles (including L-STF, L-LTF, and L-SIG), new generation preambles (e.g., U-SIG, EHT-STF, or EHT-LTF), and a data field.

[0172]

[0182] In high-frequency communications, OFDM technology is not used at the beginning of a PPDU. Specifically, in high-frequency communications, multiple fields within the preamble are first modulated in single-carrier (SC) mode, and only the fields after the preamble are transmitted using OFDM technology. This achieves advantages such as a low peak-to-average power ratio (PAPR), phase noise suppression, and so on. However, the transmission mode in which both SC and OFDM are used in PPDUs also has some drawbacks: for example, the modulation scheme in the PPDU is not unified or compatible with the format of low-frequency PPDUs. This introduces extra complexity to devices that implement both low and high frequencies.

[0173]

[0183] Therefore, high-frequency PPDUs can be transmitted by using an "upclocking" version based on low-frequency PPDUs.

[0174]

[0184] The following example uses L-STF in VHT PPDU to explain "upclocking".

[0175]

[0185] For example, the L-STF sequence format of a VHT PPDU in the frequency domain may be represented by the following formula:

number

[0176]

[0186] s -26,26 This represents a sequence of -26 to 26 subcarriers, where each value within {} corresponds to a single subcarrier in the frequency domain.

[0177]

[0187] In OFDM transmission, the number of L-STF subcarriers is 64, but at legacy low frequencies, information is usually transmitted only in a portion of the subcarriers. Therefore, subcarriers 26 to 26 are shown in the above equation, and sequence s -26,26 The 11 zeros on the left and right sides are not given. 64 subcarriers are used, and each subcarrier corresponds to 0.05 microseconds, so the period corresponding to the 64 subcarriers is 3.2 microseconds. Based on the relationship that periodicity and subcarrier intervals are reciprocals of each other, the subcarrier interval corresponding to the aforementioned sequence is 312.5 kHz (i.e., 1 / 3.2 microseconds).

[0178]

[0188] "Upclocking" means shortening the time interval between adjacent subcarriers. If the number of subcarriers used for transmission remains constant, the periodicity corresponding to the same number of subcarriers is shortened. Since periodicity is inversely related to subcarrier spacing, subcarrier spacing increases.

[0179]

[0189] For example, in the case of a VHT PPDU (as shown in Figure 3(a)), the subcarrier spacing of all fields in the PPDU is 312.5 kHz. When 4x upclocking is used, the subcarrier spacing of the 4x upclocking version of the VHT PPDU (i.e., 4x802.11ac PPDU) is 1.25 MHz (i.e., 312.5 kHz × 4). When 8x upclocking is used, the subcarrier spacing of the 8x upclocking version of the VHT PPDU (i.e., 8x802.11ac PPDU) is 2.5 MHz (i.e., 312.5 kHz × 8).

[0180]

[0190] Regarding another example, in the case of an EHT MU PPDU (as shown in Figure 3(c)), the subcarrier spacing of all fields prior to EHT-STF (including the L-STF field, L-LTF field, L-SIG field, RL-SIG field, and U-SIG field) is 312.5 kHz, while the subcarrier spacing of EHT-STF and subsequent fields (including the EHT-STF field, EHT-LTF field, data field, and PE field) changes to 78.125 kHz, with each 20 MHz containing 256 subcarriers. When 16x upclocking is used, in the 16x upclocking version of the EHT MU PPDU (i.e., 16x802.11 PPDU), the subcarrier spacing of the field prior to the EHT-STF is 5 MHz (i.e., 312.5 kHz × 16), and the subcarrier spacing of the EHT-STF and subsequent fields, such as the data field, is 1.25 MHz (i.e., 78.125 kHz × 16).

[0181]

[0191] Table 1 shows the parameters for 4×802.11ac PPDU, 8×802.11ac PPDU, and 16×802.11be PPDU. The parameters include: available bandwidth for transmission, subcarrier spacing, discrete Fourier transform (DFT) / inverse discrete Fourier transform (IDFT) period, and IDFT / DFT size. The IDFT / DFT size is sometimes referred to as the number of points or subcarriers in the IDFT / DFT. For example, an IDFT size of 64 indicates a 64-point or 64-subcarrier IDFT: Table 1 [Table 1]

[0182]

[0192] The above sequences -26,26In this case, there are three zeros between the non-null subcarriers. If we do not consider that "the non-null subcarriers are separated by three zeros," the number of subcarriers is 16 (specifically, the bolded subcarriers in the sequence above). The periodicity corresponding to 16 subcarriers is 0.8 microseconds. Specifically, the period is one-quarter of the original period. When zeros are considered, the number of subcarriers is greater than when zeros are not considered, which is equivalent to extending the transmission time. Thus, in practice, there are 4 L-STF symbols per 3.2 microseconds. In other words, the L-STF field of the PPDU occupies 4 symbols in the time domain.

[0183]

[0193] In this application, the subcarrier interval is four times the subcarrier interval shown in the aforementioned formula, without considering that "non-null subcarriers are separated by three zeros." For simplicity, in L-STF, the subcarrier interval when "non-null subcarriers are separated by three zeros" is considered is called the nominal subcarrier interval, and the subcarrier interval when "non-null subcarriers are separated by three zeros" is not considered is called the actual subcarrier interval. Thus, the period corresponding to the 64 subcarriers in the L-STF sequence is 3.2 microseconds, and the nominal subcarrier interval is 312.5 kHz (i.e., 1 / 3.2 microseconds). In practice, each L-STF symbol lasts for 0.8 microseconds, and the actual subcarrier interval is 1.25 MHz (i.e., 1 / 0.8 microseconds). In the aforementioned explanation of "upclocking," the nominal subcarrier interval is used as the basis for calculations. However, the actual subcarrier spacing may be used as the basis for calculations instead. For example, in the case of a VHT PPDU (shown in Figure 3(a)), the actual subcarrier spacing for all fields of the PPDU is 1.25 MHz. If 4x upclocking is used, the actual subcarrier spacing for the 4x upclocked version of the VHT PPDU (i.e., 4x802.11ac PPDU) is 5 MHz (i.e., 1.25 MHz × 4).

[0184]

[0194] For simplicity, unless otherwise specified, the subcarrier interval may be the nominal subcarrier interval.

[0185]

[0195] It should be understood that L-STF can be used for symbol detection, carrier frequency offset (CFO) correction, and other purposes. The maximum range of CFO correction is half the actual subcarrier interval. Specifically, the offset for which CFO correction can be performed is from -1 / 2 subcarrier interval to 1 / 2 subcarrier interval. Therefore, in L-STF, the CFO that can be corrected ranges from -612.5 kHz to +612.5 kHz.

[0186]

[0196] Furthermore, the L-STF in the VHT PPDU is the L-STF sequence corresponding to 20 MHz. In low-frequency communications, during the transmission of PPDUs at 40 MHz, 80 MHz, 160 MHz, or even 320 MHz, the L-STF is repeatedly transmitted (duplicated) over each 20 MHz. "Duplicating" may mean completely identical or overlapping content. The actual sequence may be obtained by multiplying the L-STF sequence by a coefficient (e.g., +1, -1, j, or -j). This can achieve phase rotation and reduce PAPR.

[0187]

[0197] In the explanation above, it should be further understood that "PPDU subcarrier spacing" or "field subcarrier spacing" refers to the subcarrier spacing between subcarriers used to transmit the PPDU or field.

[0188]

[0198] As explained above, in the current "upclocking" version of PPDU, a unified "upclocking" mode is sampled and used. Specifically, the same multiplier of "upclocking" is used for different parts of the PPDU. However, the unified upclocking version is not the optimal choice. For example, since the CFO correction range is half the actual subcarrier spacing, a larger subcarrier spacing will certainly show a larger offset correction range, while a smaller subcarrier spacing will show higher correction accuracy. Thus, as the subcarrier spacing increases, the correction accuracy is affected accordingly. In another example, in the data field part, since offset correction is performed, if the number of subcarriers remains constant, a larger subcarrier spacing will show less interference between subcarriers and therefore show higher performance gain.

[0189]

[0199] In view of this, the present application provides a communication method and communication apparatus that enable all PPDUs in high-frequency communication to be transmitted in OFDM mode, thereby facilitating the reception and transmission of PPDUs by a device. Furthermore, it is possible to satisfy the different requirements of different parts of a high-frequency PPDU regarding subcarrier spacing and achieve better transmission performance.

[0190]

[0200] Figure 4 is a schematic flowchart of the communication method 200 according to an embodiment of the present application. Method 200 is illustrated by using, as an example, an interaction between a first station and a second station. Method 200 may include the following steps:

[0191]

[0201] S210: The first station generates the first physical layer protocol data unit (PPDU).

[0192]

[0202] In this application, the first station may be a network-side device, such as an AP; or the first station may be a terminal-side device, such as a non-AP station.

[0193]

[0203] The first PPDU includes a first part and a second part, with the first part of the first PPDU positioned before the second part of the first PPDU in the frame format.

[0194]

[0204] It should be understood that a PPDU may contain one or more fields. In this application, a PPDU can be divided in terms of frame format. At least one field located near the front in the frame format may be called the first part of the first PPDU. At least one field located near the rear in the frame format may be called the second part of the first PPDU.

[0195]

[0205] Furthermore, the first PPDU may or may not include additional parts in addition to the first and second parts. This is not limited to the present application.

[0196]

[0206] In this application, the "first part of the PPDU" may also be referred to as the "first field part of the PPDU," and the "second part of the PPDU" may also be referred to as the "second field part of the PPDU."

[0197]

[0207] S220: The first station transmits the first part of the first PPDU by using a subcarrier in the first subcarrier interval and transmits the second part of the first PPDU by using a subcarrier in the second subcarrier interval. Correspondingly, the second station receives the first part of the first PPDU by using a subcarrier in the first subcarrier interval and receives the second part of the first PPDU by using a subcarrier in the second subcarrier interval.

[0198]

[0208] In this application, the second station may be a network-side device, such as an AP; or the second station may be a terminal-side device, such as a non-AP station. In other words, Method 200 is applicable to the scenario shown in Figure 1.

[0199]

[0209] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0200]

[0210] In other words, the ratio (i.e., x) of the subcarrier spacing corresponding to the subcarrier used to transmit the first part of the first PPDU (i.e., the first subcarrier spacing) to the subcarrier spacing corresponding to the subcarrier used to transmit the first part of the second PPDU (i.e., the third subcarrier spacing) is different from the ratio (i.e., y) of the subcarrier spacing corresponding to the subcarrier used to transmit the second part of the first PPDU (i.e., the second subcarrier spacing) to the subcarrier spacing corresponding to the subcarrier used to transmit the second part of the second PPDU (i.e., the fourth subcarrier spacing); and the subcarrier spacing corresponding to the subcarrier used to transmit the first part of the first PPDU (i.e., the first subcarrier spacing) is different from the subcarrier spacing corresponding to the subcarrier used to transmit the first part of the second PPDU (i.e., the third subcarrier spacing).

[0201]

[0211] Optionally, the third subcarrier interval and the fourth subcarrier interval may be the same or different.

[0202]

[0212] It should be understood that all of the aforementioned subcarrier intervals may be actual or nominal subcarrier intervals. This is not limited to the present application.

[0203]

[0213] As an option, the terms "subcarrier interval" as used in "first subcarrier interval," "second subcarrier interval," "third subcarrier interval," and "fourth subcarrier interval" have the same meaning. For example, "subcarrier interval" refers to the actual subcarrier interval. In another example, "subcarrier interval" refers to the nominal subcarrier interval.

[0204]

[0214] In this application, “transmission” includes sending and / or receiving. For example, “transmitting a PPDU” could mean sending a PPDU, or receiving a PPDU, or sending and receiving a PPDU. Accordingly, the subcarrier spacing between subcarriers used to transmit a second PPDU could include the subcarrier spacing between subcarriers used to transmit a second PPDU, or the subcarrier spacing between subcarriers used to receive a second PPDU.

[0205]

[0215] The first PPDU is transmitted on the first frequency band, and the second PPDU is transmitted on the second frequency band.

[0206]

[0216] In other words, the first PPDU is transmitted or received on the first frequency band, and the second PPDU is transmitted or received on the second frequency band.

[0207]

[0217] The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0208]

[0218] For example, the first frequency band is a "high frequency" band as defined in any one of the IEEE 802.11 standards. For example, the lowest frequency of the first frequency band is 45 GHz or higher.

[0209]

[0219] For example, the second frequency band is a "low frequency" band as defined in any one of the IEEE 802.11 standards. For example, the highest frequency of the second frequency band is 7 GHz or less.

[0210]

[0220] According to the aforementioned solution, the present application defines both the subcarrier spacing between subcarriers for transmitting the first part of the first PPDU and the subcarrier spacing between subcarriers for transmitting the second part of the first PPDU. Thus, both the first and second parts of the first PPDU are transmitted in OFDM mode, avoiding the use of a hybrid transmission mode of SC and OFDM. Furthermore, it becomes possible to satisfy the different requirements of different parts of the first PPDU regarding subcarrier spacing, achieving better transmission performance.

[0211]

[0221] For example, the first part of the first PPDU is transmitted with a small subcarrier interval to improve the offset correction performance of the first part of the first PPDU; the second part of the first PPDU is transmitted with a large subcarrier interval to improve the decoding performance of the second part of the first PPDU. In summary, the packet error rate of the first PPDU can be reduced through transmission with an appropriate subcarrier interval.

[0212]

[0222] Optionally, Method 200 includes the following steps: S230: The second station analyzes the first PPDU.

[0213]

[0223] For example, a second station can analyze each field in the first PPDU and acquire the data transported by the first PPDU.

[0214]

[0224] Optionally, the first part of the second PPDU does not overlap with the fundamental channel elements of the second frequency band.

[0215]

[0225] Optionally, the second part of the second PPDU also does not overlap with the fundamental channel elements of the second frequency band.

[0216]

[0226] In this application, the basic channel element is determined based on the channel design of the first or second frequency band. The basic channel element may be called channel granularity, bandwidth granularity, or similar, and is the minimum available channel in the first or second frequency band, or the minimum bandwidth available for PPDU in the first or second frequency band.

[0217]

[0227] For example, if the first frequency band is a “high frequency” band as defined in any one of the IEEE 802.11 standards, the fundamental channel element of the first frequency band could be 2.16 GHz or 1.08 GHz.

[0218]

[0228] Optionally, the fundamental channel element of the first frequency band may be an integer multiple of the fundamental channel element of the second frequency band.

[0219]

[0229] In another example, if the second frequency band is a “low frequency” band as defined in any one of the IEEE 802.11 standards, the fundamental channel element of the second frequency band may be 20 MHz in 802.11n, 11g, 11ac, 11ax, or 11be.

[0220]

[0230] Optionally, the fundamental channel element of the first frequency band may be an integer multiple of 20 MHz, for example, 20 MHz, 40 MHz, 80 MHz, 160 MHz, 320 MHz, or 640 MHz.

[0221]

[0231] Optionally, in one implementation, the first part of the first PPDU is duplicated (reproduced) in the fundamental channel element of the first frequency band.

[0222]

[0232] The repeated transmission of a first part of a first PPDU in the fundamental channel element of a first frequency band may be understood as multiple first parts of a first PPDU being transmitted in the fundamental channel element of a first frequency band.

[0223]

[0233] In this case, "duplicating" may mean being exactly the same, or it may mean that only the content is duplicated. Specifically, there may be multiple duplicated contents (i.e., multiple first parts of the first PPDU) within the basic channel element of the first frequency band, but a phase rotation may be performed on the same content (the first part of the first PPDU), specifically, the same content may be multiplied by different coefficients.

[0224]

[0234] Therefore, as an option, the repeated transmission of the first part of the first PPDU in the fundamental channel element of the first frequency band may be replaced by: the transmission of the first part of the first PPDU multiplied by a specific coefficient in the fundamental channel element.

[0225]

[0235] For example, a repeatedly transmitted sequence may be obtained by multiplying the basic sequence by a coefficient, such as +1, -1, j, or -j. This can perform phase rotation and reduce the peak-to-average power ratio (PAPR, or simply peak-to-average ratio).

[0226]

[0236] Since OFDM symbols are obtained by superimposing multiple independently modulated subcarrier signals, it should be understood that if the phases of the subcarriers are the same or similar, the superimposed signals will be modulated using the same initial phase signal, resulting in high PAPR. Therefore, when the first part of a first PPDU is transmitted repeatedly, the first transmitted sequence (i.e., the initial phase signal) can be multiplied by a coefficient, such as +1, -1, j, or -j, to perform a phase rotation and reduce PAPR.

[0227]

[0237] Furthermore, it should be understood that the aforementioned coefficients are merely examples and should not be interpreted as limitations on this application. The coefficients may be specified as any value in the application.

[0228]

[0238] Furthermore, the repeatedly transmitted sequence may, alternatively, be slightly modified based on the base sequence. For example, the values ​​of some subcarriers in the base sequence may be changed. In another example, some subcarriers may be removed from or added to the base sequence. The fine-tuning may be understood as a repeated transmission.

[0229]

[0239] In this implementation, x and y satisfy the following relationship: x is less than y.

[0230]

[0240] Specifically, x is smaller than y, and therefore the frequency domain width of the first part of the first PPDU is smaller than the frequency domain width of the second part of the first PPDU. The first part of the first PPDU is transmitted iteratively in the basic channel element of the first frequency band, and as a result, the transmission bandwidth requirement of the first PPDU can be met.

[0231]

[0241] The total number of times the first part of the first PPDU is transmitted in the fundamental channel element of the first frequency band may be y / x.

[0232]

[0242] Specifically, x is less than y, and therefore the ratio of the frequency domain width of the first part of the first PPDU to the frequency domain width of the second part of the first PPDU is x / y. To ensure that different parts of the PPDU correspond to the same transmission bandwidth, the total number of times the first part of the first PPDU is transmitted in the basic channel element of the first frequency band may be y / x times.

[0233]

[0243] Optionally, in another implementation, the size of the data carried in the second part of the first PPDU within the basic channel element of the first frequency band is larger than the size of the data carried in the second part of the second PPDU. Thus, the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU; in other words, some fields within the second part of the first PPDU are transmitted iteratively within the basic channel element of the first frequency band.

[0234]

[0244] In this implementation, x and y satisfy the following relationship: x is greater than y.

[0235]

[0245] Specifically, x is greater than y, and therefore the frequency domain width of the first part of the first PPDU is greater than the frequency domain width of the second part of the first PPDU. The frequency domain width of the second part of the first PPDU is complemented to be the same as the frequency domain width of the first part of the first PPDU, thereby satisfying the transmission bandwidth requirements of the first PPDU.

[0236]

[0246] The total number of times the second part of the first PPDU is transmitted in the fundamental channel element of the first frequency band may be x / y.

[0237]

[0247] Specifically, x is greater than y, and therefore the ratio of the frequency domain width of the first part of the first PPDU to the frequency domain width of the second part of the first PPDU is y / x. To ensure that different parts of the PPDU correspond to the same transmission bandwidth, the total number of times the second part of the first PPDU is transmitted in the basic channel element of the first frequency band may be x / y times.

[0238]

[0248] Optionally, the second part of the first PPDU includes data fields.

[0239]

[0249] It should be understood that during the transmission of the second part of the first PPDU, some fields within the second part of the first PPDU (e.g., signal fields) may be transmitted repeatedly, and the data carried in the data fields within the second part of the first PPDU may change each time. In other words, the data fields in the first PPDU can carry more data than the data fields in the second PPDU.

[0240]

[0250] Optionally, the first part of the second PPDU is used to correct the CFO.

[0241]

[0251] For example, the second PPDU is any one of the VHT PPDU, HE PPDU, and EHT PPDU. Specifically, the second PPDU may be a PPDU in the VHT, HE, or EHT standard. This is specifically illustrated in Figure 3. Furthermore, the second PPDU may alternatively be a PPDU in a later version of 802.11, or a next-generation PPDU in 802.11. The first part of the second PPDU may include the L-STF of the PPDU. The second part of the second PPDU may include all fields in the PPDU other than the L-STF.

[0242]

[0252] It should be understood that in this application, the use of the first part of the second PPDU for correcting the CFO is used as an example. However, the first part of the second PPDU may also be used to implement other functions, such as PPDU discovery, coarse synchronization, and automatic gain control. This is not limited to this application.

[0243]

[0253] Optionally, the first part of the first PPDU is used to correct the CFO.

[0244]

[0254] It should be understood that in this application, the first part of the first PPDU is used as an example to correct the CFO. However, the first part of the first PPDU may also be used to implement other functions, such as PPDU discovery, coarse synchronization, and automatic gain control.

[0245]

[0255] For example, in this application, the first part of the first PPDU and the first part of the second PPDU may have similar functions, or they may have several of the same functions.

[0246]

[0256] In possible implementations, the first PPDU may be obtained based on the second PPDU.

[0247]

[0257] For example, the first part of the first PPDU and the first part of the second PPDU contain the same field, for instance, both containing an L-STF field. The difference lies in the subcarrier spacing between subcarriers used to transmit the field in the first PPDU being different from the subcarrier spacing between subcarriers used to transmit the field in the second PPDU.

[0248]

[0258] Optionally, the second part of the first PPDU includes data fields.

[0249]

[0259] In one example, the first part of the first PPDU includes L-STF, which is used to correct CFO.

[0250]

[0260] For example, Figure 5 shows the format of the first PPDU and the format of the second PPDU according to the embodiment of this application. Hereinafter, this embodiment will be described in detail using Figure 5 as an example. In Figure 5, it is assumed that the fundamental channel element of the low-frequency band is 20 MHz and the fundamental channel element of the high-frequency band is 320 MHz. In Figure 5, 'a' in parentheses represents the actual subcarrier spacing.

[0251]

[0261] As shown in Figure 5, PPDU#2 (an example of a second PPDU) is a VHT PPDU (as shown in Figure 3(a)). The first part of PPDU#2 includes the L-STF, and the second part of PPDU#2 includes fields other than the L-STF. PPDU#2 is transmitted over a low-frequency band of 20 MHz with a fundamental channel element of 20 MHz. The actual subcarrier spacing between subcarriers used to transmit all fields within PPDU#2 is 1.25 MHz.

[0252]

[0262] The fields contained in PPDU#1 (an example of the first PPDU) are the same as the fields contained in PPDU#2. The first part of PPDU#1 contains the L-STF, and the second part of PPDU#1 contains fields other than the L-STF. PPDU#1 is transmitted in the high-frequency band. The actual subcarrier spacing between subcarriers used for the L-STF in PPDU#1 may be 10 MHz, which is 8 times the actual subcarrier spacing between subcarriers used to transmit the L-STF in PPDU#2. The actual subcarrier spacing between subcarriers used for fields in PPDU#1 other than the L-STF may be greater than 10 MHz, for example, 20 MHz, which is 16 times the actual subcarrier spacing between subcarriers used to transmit fields in PPDU#2 other than the L-STF. Since 8 times is less than 16 times, the frequency domain width of the L-STF in PPDU#1 (160 MHz = 20 MHz × 8) is smaller than the frequency domain width of another field (320 MHz = 20 MHz × 16). To satisfy transmission in a 320 MHz bandwidth, the L-STF in PPDU#1 can be transmitted repeatedly within 320 MHz. Therefore, as shown in Figure 5, the L-STF in PPDU#1 may be duplicated twice within 320 MHz (specifically, the L-STF in PPDU#1 is divided into two lines in the frequency domain), with a frequency domain width of 160 MHz occupied each time. The reason for performing the duplication twice is that 16 / 8 = 2.

[0253]

[0263] The fields contained in PPDU#3 (another example of the first PPDU) are the same as the fields contained in PPDU#2. The first part of PPDU#3 contains the L-STF, and the second part of PPDU#3 contains fields other than the L-STF. PPDU#3 is transmitted in the high-frequency band. The actual subcarrier spacing between subcarriers used for the L-STF in PPDU#3 may be 20 MHz, which is 16 times the actual subcarrier spacing between subcarriers used to transmit the L-STF in PPDU#2. The actual subcarrier spacing between subcarriers used for fields in PPDU#3 other than the L-STF may be less than 20 MHz, for example, 10 MHz, which is 8 times the actual subcarrier spacing between subcarriers used to transmit fields in PPDU#2 other than the L-STF. Since 16 times is greater than 8 times, the frequency domain width of L-STF in PPDU#3 (320 MHz = 20 MHz × 16) is greater than the frequency domain width of the other fields (160 MHz = 20 MHz × 8). To satisfy the transmission requirement of a 320 MHz bandwidth, the frequency domain widths of the fields in PPDU#3 other than L-STF can be complemented to be the same as that of L-STF. Therefore, as shown in Figure 5, the fields in PPDU#3 other than L-STF may be transmitted twice within 320 MHz (specifically, L-LTF, L-SIG, VHT-SIG-A, VHT-STF, VHT-LTF, VHT-SIG-B, and the data field in PPDU#3 are each divided into two lines in the frequency domain), with a frequency domain width of 160 MHz occupied each time. The reason for transmitting twice is that 16 / 8 = 2. It should be understood that the data fields within PPDU#3 may carry different data each time it is transmitted.

[0254]

[0264] In Figure 5, the field used to correct the CFO in PPDU#1, PPDU#2, and PPDU#3 is L-STF, and this field is located in the first part of PPDU#1, PPDU#2, and PPDU#3.

[0255]

[0265] According to the aforementioned solution, high-frequency PPDUs may be designed based on existing low-frequency PPDUs. This is simple and efficient.

[0256]

[0266] In Figure 5, it should be understood that some fields in PPDU#1 and PPDU#3 are split into two lines. This simply indicates an increase in the number of replications or subcarriers in the frequency domain. The naming and format of the fields within the first PPDU (e.g., PPDU#1 or PPDU#3) are not limited in this application. Specifically, the fields split into two lines may be referred to as two fields or as one field. The field names may be the same as those in PPDU#2, or they may be different, newly defined names. This is not limited. For example, in the case of PPDU#1 in Figure 5, the PPDU may be referred to as containing two L-STF fields, each occupying 160 MHz, or the PPDU may be referred to as containing one L-STF field at 320 MHz.

[0257]

[0267] Optionally, in this example, the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

[0258]

[0268] For example, a legacy low-frequency PPDU (an example of the second PPDU) includes 10 L-STF symbols. In this case, during high-frequency transmission, more L-STF symbols, for example, 15 or 20 L-STF symbols, may be transmitted in the high-frequency PPDU (an example of the first PPDU).

[0259]

[0269] In the present application, it should be understood that one field occupies one or more symbols in the time domain, and different fields may occupy the same amount of symbols or different amounts of symbols.

[0260]

[0270] According to the above solution, the receiving end has more L-STF symbols for correcting the CFO, and the offset correction accuracy can be improved.

[0261]

[0271] As an option, in this example, the frequency domain sequence of the L-STF in the first PPDU may be the same as or different from the frequency domain sequence of the L-STF in the second PPDU.

[0262]

[0272] In other words, in the present application, the frequency domain sequence of the field used to correct the CFO in the high-frequency PPDU may be the same as or different from that in the low-frequency PPDU.

[0263]

[0273] In another example, the first part of the first PPDU includes a new field, and the new field is used to correct the CFO.

[0264]

[0274] The new field may also be called the third field and may implement functions such as CFO correction and symbol detection.

[0265]

[0275] As an option, in this example, the first PPDU may not include L-STF.

[0266]

[0276] As an option, in this example, the first PPDU may alternatively include an L-SFT, and the L-STF is located after the new field in the frame format. For example, the L-STF may be arranged within the second part of the first PPDU.

[0267]

[0277] In one implementation, when the first PPDU includes an L-SFT, the number of symbols occupied by the L-STF in the first PPDU in the time domain is less than or equal to the amount of symbols occupied by the L-STF in the second PPDU in the time domain.

[0268]

[0278] Specifically, the new field may implement functions such as CFO correction and symbol detection, and since the L-STF also has similar functions, the L-STF in the first PPDU may be shortened or deleted.

[0269]

[0279] For example, a legacy low-frequency PPDU (an example of the second PPDU) includes 10 L-STFs. In this case, during high-frequency transmission, fewer L-STFs, such as 5 to 3 L-STFs, may be transmitted in the high-frequency PPDU (an example of the first PPDU).

[0270]

[0280] For example, Figure 6 shows the format of a first PPDU and a format of a second PPDU according to an embodiment of the present application. This embodiment will be described in detail below using Figure 6 as an example. In Figure 6, it is assumed that the fundamental channel element of the low-frequency band is 20 MHz and the fundamental channel element of the high-frequency band is 320 MHz. In Figure 6, 'a' in parentheses represents the actual subcarrier spacing. As shown in Figure 6, PPDU#2 (an example of the second PPDU) is a VHT PPDU (as shown in Figure 3(a)). The first part of PPDU#2 includes the L-STF, and the second part of PPDU#2 includes fields other than the L-STF. PPDU#2 is transmitted over the 20 MHz low-frequency band with 20 MHz as the fundamental channel element. The actual subcarrier spacing between subcarriers used to transmit all fields in PPDU#2 is 1.25 MHz.

[0271]

[0281] PPDU#4 (another example of the first PPDU) includes a new field and fields that are the same as the fields in PPDU#2 (where the fields that are the same as the fields in PPDU#2 include the L-STF). The first part of PPDU#4 includes the new field, and the second part of PPDU#4 includes fields that are the same as the fields in PPDU#2. PPDU#4 is transmitted in the high-frequency band. The actual subcarrier spacing between subcarriers used for the new field in PPDU#4 may be 10 MHz, which is 8 times the actual subcarrier spacing between subcarriers used to transmit the L-STF in PPDU#2. The actual subcarrier spacing between subcarriers used for the fields in PPDU#4 that are the same as the fields in PPDU#2 may be greater than 10 MHz, for example, 20 MHz, which is 16 times the actual subcarrier spacing between subcarriers used to transmit the fields in PPDU#2 other than the L-STF. Since 8 times is less than 16 times, the frequency domain width of the new field in PPDU#4 (160MHz = 20MHz × 8) is smaller than the frequency domain width of another field (320MHz = 20MHz × 16). To satisfy transmission in a 320MHz bandwidth, the new field in PPDU#4 can be transmitted repeatedly within 320MHz. Therefore, as shown in Figure 6, the new field in PPDU#4 may be duplicated twice within 320MHz (specifically, the new field in PPDU#4 is divided into two lines in the frequency domain), with a frequency domain width of 160MHz occupied each time. The reason for performing the duplication twice is that 16 / 8 = 2.

[0272]

[0282] PPDU#5 (another example of the first PPDU) includes a new field and fields that are the same as the fields in PPDU#2 (where the fields that are the same as the fields in PPDU#2 include the L-STF). The first part of PPDU#5 includes the new field, and the second part of PPDU#5 includes fields that are the same as the fields in PPDU#2. PPDU#5 is transmitted in the high-frequency band. The actual subcarrier spacing between subcarriers used for the new field in PPDU#5 may be 20 MHz, which is 16 times the actual subcarrier spacing between subcarriers used to transmit the L-STF in PPDU#2. The actual subcarrier spacing between subcarriers used for the fields in PPDU#5 that are the same as the fields in PPDU#2 may be less than 20 MHz, for example, 10 MHz, which is 8 times the actual subcarrier spacing between subcarriers used to transmit the fields in PPDU#2 other than the L-STF. Since 16 times is greater than 8 times, the frequency domain width of the new field in PPDU#5 (320MHz = 20MHz × 16) is greater than the frequency domain width of another field (160MHz = 20MHz × 8). To satisfy transmission in a 320 MHz bandwidth, the frequency domain width of the field in PPDU#5 that is the same as the field in PPDU#2 can be complemented to be the same as the frequency domain width of the new field. Thus, as shown in Figure 6, the field in PPDU#5 that is the same as the field in PPDU#2 may be transmitted twice within 320MHz (specifically, the L-STF, L-LTF, L-SIG, VHT-SIG-A, VHT-STF, VHT-LTF, VHT-SIG-B, and data fields in PPDU#5 are each divided into two lines in the frequency domain), with a frequency domain width of 160MHz occupied each time. The reason for transmitting twice is that 16 / 8 = 2. It should be understood that the data fields within PPDU#5 may carry different data each time it is transmitted.

[0273]

[0283] In Figure 6, the field used to correct the CFO in PPDU#2 is L-STF, and this field is located within the first part of PPDU#2. However, the field used to correct the CFO in PPDU#4 and PPDU#5 is a new field, and this new field is located within the first part of PPDU#4 and PPDU#5. Furthermore, the L-STF in PPDU#4 and PPDU#5 is located within the second part.

[0274]

[0284] In Figure 6, it should be understood that some fields in PPDU#4 and PPDU#5 are split into two lines. This simply indicates an increase in the number of copies or subcarriers in the frequency domain. The names and formats of the fields within the first PPDU (e.g., PPDU#4 or PPDU#5) are not limited in this application. Specifically, the fields split into two lines may be referred to as two fields or as one field. The names of the fields may be the same as the names in PPDU#2, or they may be different, newly defined names. This is not limited. For example, in the case of PPDU#5 in Figure 6, the PPDU may be referred to as containing two data fields, each occupying 160 MHz, or the PPDU may be referred to as containing one data field occupying 320 MHz.

[0275]

[0285] Optionally, in Figure 6, the number of symbols occupied in the time domain by L-STFs contained in PPDU#4 and PPDU#5 is less than the number of symbols occupied in the time domain by L-STFs contained in PPDU#2.

[0276]

[0286] As an option, PPDU#4 and PPDU#5 in Figure 6 may not contain L-STF.

[0277]

[0287] According to the aforementioned solution, when designing high-frequency PPDUs, it is possible to ensure the integrity of low-frequency PPDUs at high frequencies and facilitate demodulation.

[0278]

[0288] It should be understood that Figures 5 and 6 are merely examples. PPDU#2 may alternatively include other fields, and at least one of PPDU#1, PPDU#3, PPDU#4, and PPDU#5 may alternatively include other fields. This is not limited to the present application.

[0279]

[0289] Furthermore, in Figures 5 and 6, an example where PPDU#2 is a VHT PPDU is used for illustrative purposes. PPDU#2 may alternatively be any PPDU operating on the high-frequency band. For example, PPDU#2 may be a HE SU PPDU as shown in Figure 3(b). In another example, PPDU#2 may be an EHT MU PPDU as shown in Figure 3(c).

[0280]

[0290] It should be further understood that in this application, the field used to amend the CFO is used as an example to refer to a legacy-short training field (L-STF). This is merely an example, and the field used to amend the CFO may have a different name, for example, a short training field (STF) or a training field (TF). This is not limited to this application.

[0281]

[0291] In FIGS. 5 and 6, it should be further understood that the actual sub-carrier spacing is used as an example for explanation. This is merely an example and is not to be construed as a limitation on the present application. For example, when determining the sub-carrier spacing of the first PPDU, the nominal sub-carrier spacing of the second PPDU may alternatively be used, and the corresponding result is the nominal sub-carrier spacing of the first PPDU.

[0282]

[0292] As an option, in the present application, the frequency domain sequence of the new field may be the same as or different from the frequency domain sequence of the L-STF in the second PPDU. This is not limited in the present application.

[0283]

[0293] In other words, in the present application, the frequency domain sequence of the field used to correct the CFO in the high-frequency PPDU may be the same as or different from that in the low-frequency PPDU.

[0284]

[0294] x satisfies the following conditions:

Number

[0285]

[0295] In Equation (1), f a is the highest frequency of the first frequency band, e is the maximum error allowed for a device operating in the first frequency band, and Δf is the third sub-carrier spacing.

[0286]

[0296] e is the maximum error of the device for the first frequency band as defined by the standard. However, in actual application, the maximum error of devices manufactured by each manufacturer may be less than e. For example, the maximum error allowed for the first station in CFO correction may be e or less than e. Similarly, the maximum error allowed for the second station in CFO correction may be e or less than e.

[0287]

[0297] For example, in a WLAN, the device error in CFO correction does not typically need to exceed 20 ppm in millionths, i.e., 20 ppm. Therefore, e = 20 ppm. Assume the highest frequency of the first frequency band is 70 GHz. In extreme cases, the subcarrier frequency offset between devices at both ends can reach 70 GHz × 2 × 20 ppm = ±2.8 MHz. Since the range of CFO correction is half the actual subcarrier spacing, the actual subcarrier spacing at high frequencies should be at least 5.6 MHz. The actual subcarrier spacing of the L-STF in a low-frequency PPDU (an example of a third subcarrier spacing) is 312.5 × 4 kHz = 1.25 MHz. Therefore, the multiplier (i.e., x) by which the first subcarrier spacing in the high-frequency PPDU needs to be increased to satisfy the offset correction capability of the high-frequency PPDU is at least 5.6 MHz / 1.25 MHz, i.e., 4.48. It should be understood that both the first and third subcarrier intervals in this case are actual subcarrier intervals.

[0288]

[0298] According to the aforementioned solution, the offset correction requirement for the first PPDU at high frequencies can be guaranteed, thereby improving the transmission performance of the first PPDU.

[0289]

[0299] Optionally, both x and y are positive integers.

[0290]

[0300] For example, x is an integer when equation (1) above is satisfied.

[0291]

[0301] Optionally, in an implementation scenario, method 200 includes: a third station transmits the first part of the third PPDU by using a subcarrier of the first subcarrier interval and transmits the second part of the third PPDU by using a subcarrier of the fifth subcarrier interval. Correspondingly, a fourth station receives the first part of the third PPDU by using a subcarrier of the first subcarrier interval and receives the second part of the third PPDU by using a subcarrier of the fifth subcarrier interval.

[0292]

[0302] The first subcarrier interval is x times the third subcarrier interval, the fifth subcarrier interval is z times the fourth subcarrier interval, and y is not equal to z.

[0293]

[0303] The third PPDU is transmitted over the first frequency band.

[0294]

[0304] In other words, multiple PPDUs with different subcarrier spacings may be transmitted on the first frequency band.

[0295]

[0305] Optionally, x and z may be equal or unequal. The relationship between x and z is not limited in this application.

[0296]

[0306] For example, the value of x may be 8, the value of y may be 16, and the value of z may be 8.

[0297]

[0307] It should be understood that the third station and the first station may be the same or different. This is not limited to the present application.

[0298]

[0308] It should be understood that the fourth station and the second station may be the same or different. This is not limited to the present application. In other words, the receiving end device of the third PPDU may be the second station or any other station.

[0299]

[0309] In this implementation scenario, the method may further include: the first station transmits first information to the second station, where the first information indicates the values ​​of x and y.

[0300]

[0310] In this implementation scenario, the method may further include: a third station transmits second information to a fourth station, where the second information indicates the values ​​of x and z.

[0301]

[0311] Specifically, capability negotiation is performed between the transmitting and receiving devices to determine the format of the high-frequency PPDU, or to negotiate the format that the high-frequency PPDU should use.

[0302]

[0312] The first information and / or the second information may be transmitted over the first frequency band or the second frequency band. This is not limited to the present application.

[0303]

[0313] Optionally, the fields included in the first part of the first PPDU are the same as the fields included in the first part of the third PPDU.

[0304]

[0314] In other words, in order for different devices to recognize high-frequency PPDUs in different formats, one or more fields preceding the high-frequency PPDU may be in a unified format.

[0305]

[0315] For example, the second PPDU is a VHT PPDU (as shown in Figure 3(a)), and the first part of the second PPDU includes L-STF, L-LTF, and L-SIG, and the first PPDU is produced by using method 200, and the first part of the first PPDU includes L-STF, L-LTF, and L-SIG. In this case, the first part of the third PPDU also includes L-STF, L-LTF, and L-SIG.

[0306]

[0316] Figure 7 is a schematic flowchart of the communication method 300 according to an embodiment of the present application. The method 300 is illustrated by using, as an example, an interaction between a first station and a second station. The method 300 may include the following steps:

[0307]

[0317] S310: The first station generates the first PPDU.

[0308]

[0318] In the time domain, the number of symbols occupied by the first field in the first PPDU is greater than the number of symbols occupied by the second field in the second PPDU in the time domain.

[0309]

[0319] The first PPDU includes a first field, which is used to correct the CFO. The second PPDU includes a second field, which is used to correct the CFO.

[0310]

[0320] The first PPDU is transmitted on the first frequency band, and the second PPDU is transmitted on the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0311]

[0321] S320: The first station transmits the first PPDU. In response, the second station receives the first PPDU.

[0312]

[0322] For example, the first field is L-STF.

[0313]

[0323] For example, the second field is L-STF.

[0314]

[0324] For example, a legacy low-frequency PPDU (an example of a second PPDU) contains 10 L-STF symbols. In this case, during high-frequency transmission, more L-STF symbols, for example, 15 to 20 L-STF symbols, may be transmitted in the high-frequency PPDU (an example of a first PPDU).

[0315]

[0325] According to the aforementioned solution, more symbols in the first field are transmitted in the time domain, and as a result, the receiving end can obtain more symbols, correct the CFO, and improve the offset correction accuracy.

[0316]

[0326] Optionally, the subcarrier spacing between subcarriers used to transmit the first PPDU may be a multiple of the subcarrier spacing between subcarriers used to transmit the second PPDU. The multiplier may be greater than 1 or equal to 1.

[0317]

[0327] In one implementation, the subcarrier spacing between subcarriers used to transmit the first part of the first PPDU may be a multiple of the subcarrier spacing between subcarriers used to transmit the first part of the second PPDU. The multiplier may be greater than 1 or equal to 1.

[0318]

[0328] In one implementation, the subcarrier spacing between subcarriers used to transmit the second part of the first PPDU may be a multiple of the subcarrier spacing between subcarriers used to transmit the second part of the second PPDU. The multiplier may be greater than 1 or equal to 1.

[0319]

[0329] Optionally, the multiplier between the subcarrier interval used to transmit the first part of the first PPDU and the subcarrier interval used to transmit the first part of the second PPDU may be the same as or different from the multiplier between the subcarrier interval used to transmit the second part of the first PPDU and the subcarrier interval used to transmit the second part of the second PPDU.

[0320]

[0330] The first PPDU includes a first part and a second part, with the first part of the first PPDU positioned before the second part of the first PPDU in the frame format. The second PPDU includes a first part and a second part, with the first part of the second PPDU positioned before the second part of the second PPDU in the frame format.

[0321]

[0331] Optionally, method 300 may further include the following step: S330: A second station analyzes the first PPDU.

[0322]

[0332] For example, a second station can analyze each field within the first PPDU and acquire the data transported by the first PPDU.

[0323]

[0333] It should be understood that for explanations of terms such as "first frequency band" and "second frequency band," please refer to Method 200. Further details will not be explained here.

[0324]

[0334] The above describes an embodiment of the method in the present application, and a brief description of the corresponding apparatus embodiment follows. It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for parts not described in detail, please refer to the method embodiment.

[0325]

[0335] Figure 8 is a diagram of a communication device according to an embodiment of the present application. As shown in Figure 8, the communication device 1000 may include a transceiver unit 1010 and / or a processing unit 1020. The transceiver unit 1010 may communicate with the outside, and the processing unit 1020 is configured to process data / information. The transceiver unit 1010 may also be called a communication interface or communication unit.

[0326]

[0336] In possible implementations, the communication device 1000 may be the first station in Method 200, or it may be a chip configured to implement the functions of the first station in Method 200. The communication device 1000 is capable of performing processes performed by the first station in Method 200. The processing unit 1020 is configured to perform the processing-related operations of the first station in Method 200, and the transceiver unit 1010 is configured to perform the transmit / receive-related operations of the first station in Method 200.

[0327]

[0337] For example, processing unit 1020 is configured to generate a first physical layer protocol data unit (PPDU), the first PPDU comprising a first part and a second part, the first part of the first PPDU occupying a frame format prior to the second part of the first PPDU. Transceiver unit 1010 is configured to transmit the first part of the first PPDU by using subcarriers in a first subcarrier interval and the second part of the first PPDU by using subcarriers in a second subcarrier interval.

[0328]

[0338] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0329]

[0339] The first PPDU is transmitted on the first frequency band. The second PPDU is transmitted on the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0330]

[0340] It should be understood that the above is used merely as an example for comprehension. The communication device 1000 may further perform other steps, actions, or methods related to the first station in the method 200 described above. Details are not described again here.

[0331]

[0341] In another possible implementation, the communication device 1000 is capable of performing the processes performed by the second station in the method embodiment 200, and the transceiver unit 1010 is configured to perform the transmit / receive related operations of the second station in the method embodiment 200.

[0332]

[0342] Optionally, in this implementation, the communication device 1000 may further include a processing unit 1020, which is configured to perform processing-related operations of the second station in embodiment 200 of the method.

[0333]

[0343] For example, the transceiver unit 1010 is configured to receive the first part of the first physical layer protocol data unit (PPDU) by using subcarriers in a first subcarrier interval and the second part of the first PPDU by using subcarriers in a second subcarrier interval. The processing unit 1020 is configured to analyze the first PPDU.

[0334]

[0344] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0335]

[0345] The first PPDU is transmitted on the first frequency band. The second PPDU is transmitted on the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0336]

[0346] It should be understood that the above is used merely as an example for comprehension. The communication device 1000 may further perform other steps, actions, or methods related to the second station in the method 200 described above. Details are not described again here.

[0337]

[0347] In another possible implementation, the communication device 1000 may perform steps, actions, or methods related to the first station in the method 300 described above, or steps, actions, or methods related to the second station in the method 300 described above. Details relating to the communication device 1000 performing the method 300 described above have been described in embodiments of the method described above. For the sake of brevity, the details are not described again here.

[0338]

[0348] It should be understood that the communication device 1000 in this case is embodied in the form of a functional unit. The term “unit” in this case may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor configured to run one or more software or firmware programs (e.g., a shared processor, a dedicated processor, or a group processor), memory, merged logic circuits, and / or other appropriate components that support the functions described above.

[0339]

[0349] The communication device 1000 has the function of performing a corresponding step performed by the first station in the method described above, or the communication device 1000 has the function of performing a corresponding step performed by the second station in the method described above. The function may be performed by hardware, or by hardware running corresponding software. The hardware or software includes one or more modules corresponding to the function described above. For example, a transceiver unit may be replaced with a transceiver (for example, a transmitting unit in a transceiver unit may be replaced with a transmitter, and a receiving unit in a transceiver unit may be replaced with a receiver), and another unit, for example, a processing unit may be replaced with a processor, which separately perform the transmit / receive operation and the associated processing operation in the embodiment of the method.

[0340]

[0350] Furthermore, the transceiver unit may alternatively be a transceiver circuit (for example, including a receiver circuit and a transmitter circuit), and the processing unit may be a processing circuit. In the embodiments of this application, the communication device 1000 may be the first station or the second station in the embodiments described above, or it may be a chip or a chip system, such as a system-on-a-chip (SoC). The transceiver unit may be an input / output circuit or a communication interface. The processing unit may be a processor, a microprocessor, or an integrated circuit on a chip, but is not limited to this.

[0341]

[0351] Figure 9 shows another structure of a communication device according to an embodiment of the present application. As shown in Figure 9, the communication device 2100 includes at least one processor 2110 and at least one transceiver 2120. The processor 2110 is coupled to memory and configured to execute instructions stored in memory and to control the transceiver 2120 to transmit and / or receive signals. Optionally, the communication device 2100 further includes memory 2130 configured to store instructions.

[0342]

[0352] In one example, processor 2110 is configured to generate a first PPDU, which includes a first part and a second part, where the first part of the first PPDU is positioned before the second part of the first PPDU in the frame format. Transceiver 2120 is configured to transmit the first part of the first PPDU by using subcarriers in a first subcarrier interval and the second part of the first PPDU by using subcarriers in a second subcarrier interval.

[0343]

[0353] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0344]

[0354] The first PPDU is transmitted on the first frequency band. The second PPDU is transmitted on the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0345]

[0355] It should be understood that the above is used merely as an example for comprehension. The communication device 2100 may further perform other steps, actions, or methods related to the first station in the method 200 described above. Details are not described again here.

[0346]

[0356] In another possible implementation, the communication device 2100 may perform steps, actions, or methods related to the first station in the method 300 described above. Details relating to performing the aforementioned method 300 by the communication device 2100 are described in embodiments of the aforementioned method. For the sake of brevity, the details are not described again here.

[0347]

[0357] Figure 10 shows another structure of a communication device according to an embodiment of the present application. As shown in Figure 10, the communication device 2200 includes at least one transceiver 2220 configured to transmit and / or receive signals. Optionally, the communication device 2200 further includes at least one processor 2210. The processor 2210 is coupled to memory and is configured to execute instructions stored in memory to control the transceiver 2220 to transmit and / or receive signals. Optionally, the communication device 2200 further includes memory 2230 configured to store instructions.

[0348]

[0358] In one example, transceiver 2220 is configured to receive a first part of a first physical layer protocol data unit (PPDU) by using subcarriers in a first subcarrier interval and a second part of the first PPDU by using subcarriers in a second subcarrier interval. Optionally, processor 2210 is configured to parse the first PPDU.

[0349]

[0359] The first subcarrier interval is x times the third subcarrier interval. The second subcarrier interval is y times the fourth subcarrier interval. The third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU. The fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU. The first part of the first PPDU is located before the second part of the first PPDU in the frame format. The first part of the second PPDU is located before the second part of the second PPDU in the frame format. x is not equal to y, and x is not equal to 1.

[0350]

[0360] The first PPDU is transmitted on the first frequency band. The second PPDU is transmitted on the second frequency band. The lowest frequency of the first frequency band is greater than or equal to the highest frequency of the second frequency band.

[0351]

[0361] It should be understood that the above is used merely as an example for comprehension. The communication device 2200 may further perform other steps, actions, or methods related to the second station in the method 200 described above. Details are not described again here.

[0352]

[0362] In another possible implementation, the communication device 2200 may perform steps, actions, or methods related to the second station in the method 300 described above. Details relating to performing the aforementioned method 300 by the communication device 2200 are described in embodiments of the aforementioned method. For the sake of brevity, the details are not described again here.

[0353]

[0363] It should be understood that in communication device 2100 or communication device 2200, the processor and memory may be combined into a single processing unit, and the processor is configured to execute program code stored in memory to perform the aforementioned functions. In specific implementations, the memory may, alternatively, be integrated into the processor or be independent of the processor.

[0354]

[0364] It should be further understood that transceiver 2120 or transceiver 2220 may include a receiver (or referred to as a receiver device) and a transmitter (or referred to as a transmitter device). Transceiver 2120 or transceiver 2220 may further include an antenna, and one or more antennas may be present. Transceiver 2120 or transceiver 2220 may also be a communication interface or interface circuit.

[0355]

[0365] The processor referred to in the embodiments of this application may be a central processing unit (CPU), or another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the same. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the same.

[0356]

[0366] It should be further understood that the memory referred to in the embodiments of this application may be volatile memory and / or non-volatile memory. Non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM). For example, RAM may be used as an external cache. As an example, rather than an exhaustive list, RAM includes multiple forms such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchlink dynamic random access memory (synchlink DRAM, SLDRAM), and direct rambus random access memory (direct rambus RAM, DR RAM).

[0357]

[0367] It should be noted that if the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, then memory (storage modules) may be integrated into the processor.

[0358]

[0368] It should be noted that the memory described in this specification is intended to include, but is not limited to, these types of memory and other appropriate types of memory.

[0359]

[0369] Figure 11 is a diagram of a chip system 3000 according to an embodiment of the present application. The chip system 3000 (which may also be called a processing system) includes a logic circuit 3010 and an input / output interface 3020.

[0360]

[0370] The logic circuit 3010 may be a processing circuit within the chip system 3000. The logic circuit 3010 calls instructions in the memory unit, enabling the chip system 3000 to implement the methods and functions of the embodiments of this application. The input / output interface 3020 may be an input / output circuit within the chip system 3000, which can output information processed by the logic circuit 3010 or input data or signaling information to be processed into the logic circuit 3010 for processing.

[0361]

[0371] For example, logic circuit 3010 is configured to generate a first PPDU, which includes a first part and a second part, with the first part of the first PPDU positioned before the second part of the first PPDU in the frame format. Input / output interface 3020 is configured to transmit the first part of the first PPDU by using subcarriers in a first subcarrier interval and the second part of the first PPDU by using subcarriers in a second subcarrier interval.

[0362]

[0372] In another example, the input / output interface 3020 is configured to receive the first part of the first physical layer protocol data unit (PPDU) by using subcarriers in a first subcarrier interval and the second part of the first PPDU by using subcarriers in a second subcarrier interval. The logic circuit 3010 is configured to analyze the first PPDU.

[0363]

[0373] It should be understood that details regarding the implementation of the aforementioned method by the input / output interface 3020 and the logic circuit 3010 are described in detail in the embodiments of the aforementioned method. For the sake of brevity, the details are not described again here.

[0364]

[0374] According to the method provided in the embodiments of the present application, the present application further provides a computer program product, which includes computer program code. When the computer program code is executed on a computer, the computer becomes capable of performing the method in the embodiments of the aforementioned method.

[0365]

[0375] According to the method provided in the embodiments of the present application, the present application further provides a computer-readable medium. The computer-readable medium stores program code. When the program code is executed on a computer, the computer becomes capable of performing the method in the embodiments of the above-described method.

[0366]

[0376] According to the method provided in the embodiments of the present application, the present application further provides a system including the aforementioned first station and / or second station.

[0367]

[0377] In this specification, the term "at least one of..." refers to all or any combination of the listed items. For example, "at least one of A, B, and C" could refer to any of the following six cases: only A is present, only B is present, only C is present, both A and B are present, both B and C are present, or all of A, B, and C are present. In this specification, "at least one" refers to one or more items, and "multiple" refers to two or more items.

[0368]

[0378] The terms "and / or" in this specification simply describe the relationship between related subjects, indicating that three relationships are possible. For example, A and / or B could represent three cases: A exists only, both A and B exist, and B exists only. Furthermore, the letter " / " in this specification typically indicates an "or" relationship between related subjects.

[0369]

[0379] In the embodiments of this application, it should be understood that “B corresponding to A” indicates that B is associated with A and that B may be determined based on A. However, it should be further understood that determining B based on A does not mean that B is determined solely based on A, and that B may alternatively be determined based on A and / or other information. The terms “includes,” “equipment,” “possess,” and their variations all mean “includes, but not limited to,” unless specifically emphasized otherwise.

[0370]

[0380] It should be understood that in the various embodiments of this application, the terms "first," "second," and various numbers are intended merely as distinctions for the sake of clarity and do not limit the scope of the embodiments of this application. For example, these terms are intended to distinguish different information.

[0371]

[0381] A person skilled in the art will recognize that the units and algorithmic steps in the examples described with reference to the embodiments disclosed in this specification may be implemented by electronic hardware or by a combination of computer software and electronic hardware. Whether the functions are performed by hardware or by software depends on the specific application and design constraints of the technical solution. A person skilled in the art may use different methods to implement the described functions for each specific application. However, it should not be assumed that such implementations extend beyond the scope of this application.

[0372]

[0382] For the sake of ease and conciseness of explanation, it will be readily apparent to those skilled in the art that the detailed operating processes of the aforementioned systems, apparatus, and units may be described by referring to the corresponding processes in the embodiments of the methods described above. Further details will not be described here.

[0373]

[0383] It should be understood that, in some embodiments provided in this application, the systems, apparatus, and methods disclosed may be implemented in other ways. For example, the embodiments of the apparatus described are merely examples. For example, the division into multiple units is merely a logical functional division. In actual implementation, a different division method may be used. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not performed. Furthermore, mutual coupling, direct coupling, or communication connection illustrated or described may be implemented through some interface. Indirect coupling or communication connection between apparatus or units may be implemented in electrical, mechanical, or other forms.

[0374]

[0384] Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, specifically, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to the actual requirements in order to achieve the objectives of the solution of the embodiment.

[0375]

[0385] Furthermore, the functional units in the embodiments of this application may be integrated into a single processing unit, or each unit may exist physically independently, or two or more units may be integrated into a single unit.

[0376]

[0386] When a function is implemented in the form of a software function unit and sold or used as a standalone product, the function may be stored on a computer-readable storage medium. Based on such understanding, the technical solution of the present application, or a portion of the technical solution that contributes to the prior art, may be implemented in the form of a software product. A computer software product is stored on a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, server, network device, or similar) to perform all or part of the steps of the method in the embodiment of the present application. The storage medium is any medium capable of storing program code, including, for example, a USB flash drive, a removable hard disk drive, read-only memory (ROM), random access memory (RAM), a magnetic disk, or a compact disk.

[0377]

[0387] The foregoing description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any modifications or substitutions readily conceived by a person skilled in the art within the scope of the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Accordingly, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. It is a method of communication: A step of generating a first physical layer protocol data unit (PPDU), wherein the first PPDU comprises a first part and a second part, the first part of the first PPDU being located before the second part of the first PPDU in a frame format; and The step of transmitting the first part of the first PPDU by using a subcarrier in a first subcarrier interval, and the second part of the first PPDU by using a subcarrier in a second subcarrier interval, wherein the first subcarrier interval is x times the third subcarrier interval, the second subcarrier interval is y times the fourth subcarrier interval, the third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU, the fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU, the first part of the second PPDU is located before the second part of the second PPDU in the frame format, x is not equal to y, and x is not equal to 1; A method comprising the first PPDU being transmitted in a first frequency band, the second PPDU being transmitted in a second frequency band, and the lowest frequency of the first frequency band being greater than or equal to the highest frequency of the second frequency band.

2. It is a method of communication: Steps include receiving a first part of a first physical layer protocol data unit (PPDU) by using a subcarrier in a first subcarrier interval, and receiving a second part of the first PPDU by using a subcarrier in a second subcarrier interval, wherein the first part of the first PPDU is located before the second part of the first PPDU in the frame format, the first subcarrier interval is x times the third subcarrier interval, the second subcarrier interval is y times the fourth subcarrier interval, the third subcarrier interval is the subcarrier interval between subcarriers for transmitting the first part of the second PPDU, the fourth subcarrier interval is the subcarrier interval between subcarriers for transmitting the second part of the second PPDU, the first part of the second PPDU is located before the second part of the second PPDU in the frame format, x is not equal to y, and x is not equal to 1; and Steps to analyze the first PPDU; A method comprising the first PPDU being transmitted in a first frequency band, the second PPDU being transmitted in a second frequency band, and the lowest frequency of the first frequency band being greater than or equal to the highest frequency of the second frequency band.

3. A method according to claim 1 or 2, wherein the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band.

4. In the method of claim 3, the first part of the first PPDU is transmitted repeatedly in the basic channel element of the first frequency band: A method comprising transmitting the first part of the first PPDU multiplied by a coefficient in the basic channel element.

5. A method according to claim 1 or 2, wherein the frequency domain width of the second part of the first PPDU is supplemented to be the same as the frequency domain width of the first part of the first PPDU.

6. A method according to any one of claims 1 to 5, wherein the first part of the second PPDU is used to correct a carrier frequency offset.

7. A method according to any one of claims 1 to 6, wherein the first part of the first PPDU is used to correct a carrier frequency offset.

8. A method according to claim 6 or 7, wherein the first part of the first PPDU includes a legacy short training field, the legacy short training field is used to correct the carrier frequency offset.

9. The method according to claim 8, wherein the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is greater than the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

10. A method according to claim 6 or 7, wherein the first part of the first PPDU includes a novel field, the novel field being used to correct the carrier frequency offset.

11. The method according to claim 10, wherein the second part of the first PPDU includes a legacy short training field.

12. The method according to claim 11, wherein the number of symbols occupied by the legacy short training field in the first PPDU in the time domain is less than or equal to the number of symbols occupied by the legacy short training field in the second PPDU in the time domain.

13. A method according to any one of claims 10 to 12, wherein the frequency domain sequence of the new field differs from the frequency domain sequence of the legacy short training field in the second PPDU.

14. A method according to any one of claims 1 to 13, wherein the second part of the first PPDU includes a data field.

15. A method according to any one of claims 1 to 14, wherein the second part of the second PPDU includes a data field.

16. A method according to any one of claims 1 to 15, wherein the lowest frequency of the first frequency band is 45 GHz or higher.

17. A method according to any one of claims 1 to 16, wherein the highest frequency of the second frequency band is 7 GHz or less.

18. In the method according to any one of claims 1 to 17, x is subject to the following conditions: [Math 1] It satisfies f a A method in which is the highest frequency of the first frequency band, e is the maximum error allowed for a device operating in the first frequency band, and Δf is the third subcarrier interval.

19. A method according to any one of claims 1 to 18, wherein the second PPDU is any one of the ultra-high throughput VHT protocol PPDU, high-efficiency HE protocol PPDU, and extremely high throughput HET protocol PPDU.

20. A communication device comprising a unit or module that performs the method described in claim 1 or any one of claims 3 to 19.

21. A communication device comprising a unit or module that performs the method described in any one of claims 2 to 19.

22. A communication device including a processor, wherein the processor is configured to execute a computer program or instruction stored in memory so that the communication device can perform the method according to claim 1 or any one of claims 3 to 19.

23. A communication device including a processor, wherein the processor is configured to execute a computer program or instruction stored in memory so that the communication device can perform the method according to any one of claims 2 to 19.

24. A computer-readable storage medium that stores a computer program or instruction, and when the computer program or instruction is executed by a communication device, the communication device is able to perform the method according to claim 1 or any one of claims 3 to 19, or the method according to any one of claims 2 to 19.

25. A computer program product comprising a computer program or instruction for performing the method described in claim 1 or any one of claims 3 to 19, or a computer program or instruction for performing the method described in any one of claims 2 to 19.

Images