Method and apparatus for reducing peak-to-average power ratio

Abstract

This application relates to the field of communication technology, particularly to WIFI technology, and provides a method and apparatus for reducing a peak-to-average power ratio (PAPR) for transmitting a physical layer protocol data unit (PPDU). The method can be used for both an access point (AP) and a station (STA). The method includes the steps of operating on a first ignored bit sequence to obtain a second ignored bit sequence, the first ignored bit sequence having all bits set to "1", and transmitting a PPDU, the PPDU including the second ignored bit sequence.

Description

[Technical Field]

[0001] The present disclosure relates to wireless communication systems, and more particularly, but not exclusively, to systems and methods for reducing the peak to average power ratio (PAPR) in special fields of a physical layer protocol data unit (PPDU). [Background technology]

[0002] The universal signal (U-SIG) field is used in 802.11be to convey information about various important parameters to all receivers, including both access points (APs) and / or stations (STAs), such as the standard version (802.11be or later), bandwidth, and number of extremely high throughput (EHT) signal (EHT-SIG) symbols. The U-SIG consists of two OFDM symbols, each containing 26 information bits.

[0003] 802.11be is split into two releases, Release 1 and Release 2, with Release 2 being under research and some bits in the U-SIG field being reserved. There is agreement to divide these reserved bits into two types. Validate bits - used by the receiver to decide whether to continue receiving the packet or terminate reception. For example, a Release 1 receiver may understand that the packet is intended for a Release 2 receiver and can therefore terminate reception. · Disregard bits - Bits that are defined as "don't care."

[0004] Both the verification bit and the ignore bit may be used for other purposes within Release 2.

[0005] At this point, the ignore bit is set to a value of all "1"s (or 31 in decimal format) for multi-user (MU) PPDU types. The ignore bit is copied from the trigger-based (TB) frame in the TB PPDU (the validation bit is also set to "1").

[0006] The newly introduced ignore bit may cause some performance issues for both MU PPDU and TB PPDU. Summary of the Invention

[0007] It is an object of the present invention to provide a method and apparatus for reducing the PAPR for transmitting a PPDU, thereby improving the transmission performance of the PPDU.

[0008] These and other objects are achieved by the features of the independent claims. Further realisation forms are evident from the dependent claims, the description and the drawings.

[0009] According to a first aspect of the present disclosure, a communication device is disclosed. The communication device may be an AP or a STA. The communication device is used to transmit a PPDU to one or more receiving devices, the PPDU including a universal signal (U-SIG) field, the communication device including: a processor configured to operate on a first ignore bit sequence to obtain a second ignore bit sequence, the first ignore bit sequence having all bits set to "1"; and a transmitter configured to transmit the PPDU, the PPDU including the second ignore bit sequence.

[0010] In a further implementation of the first aspect, the U-SIG includes at least a first U-SIG symbol and a second U-SIG symbol.

[0011] In a further implementation of the first aspect, the operation on the first ignore bit sequence to obtain the second ignore bit sequence includes setting the value of the first ignore bit sequence to a sequence including at least one “0” bit, or changing the value of the verification bit immediately following the first ignore bit sequence to “0” and modifying the value of the first ignore bit sequence to a preset value, or changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit sequence, or replacing part of the first ignore bit sequence with a cyclic redundancy check (CRC).

[0012] In a further implementation of the first aspect, setting the value of the first ignore bit sequence to a sequence including at least one "0" bit comprises setting the first ignore bit sequence of the MU PPDU to one of the sequences in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"}, or setting the value of the TB for the first U-SIG symbol to a sequence including at least one "0" bit. setting the first ignore bit sequence of the PPDU to one of the sequences in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}, or setting the first ignore bit sequence of the TB PPDU for the second U-SIG symbol to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}, or The method includes setting a single global value of the first ignore bit sequence in the first U-SIG symbol for different BW values ​​for the PPDU, wherein the first ignore bit sequence is specifically set as binary "011110", or setting a single global value of the first ignore bit sequence in the second U-SIG symbol for different bandwidth values ​​for the TB PPDU, wherein the first ignore bit sequence is specifically set as binary "01001" or "11110".

[0013] In a further implementation of the first aspect, setting the value of the first ignore bit sequence to a sequence in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"} may mean that when the PPDU is transmitted on a 20 MHz bandwidth, the first ignore bit sequence is set to "00101", or when the PPDU is transmitted on a 40 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "00110", "01001", "01111", "10011"}, or when the PPDU is transmitted on a 40 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "00110", "01001", "01111", "10011"}. The first ignore bit sequence is set to one of {"00101", "01111", "10011", "11000"} when the PPDU is transmitted on an 80 MHz bandwidth, or the first ignore bit sequence is set to one of {"00101", "10101"} when the PPDU is transmitted on a 160 MHz bandwidth, or the first ignore bit sequence is set to one of {"00101", "10110"} when the PPDU is transmitted on a 320 MHz bandwidth, or the first ignore bit sequence is set to "00101" for any bandwidth.

[0014] In a further implementation of the first aspect, changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value includes setting the preset value to "01001" for a 20 MHz bandwidth.

[0015] In a further implementation of the first aspect, changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore includes moving the first ignore bit sequence after the basic service set (BSS) color field and before the TXOP field, or moving the first ignore bit sequence immediately before the BSS color field.

[0016] In a further implementation of the first aspect, replacing a portion of the first ignore bit sequence with a cyclic redundant check (CRC) includes using one bit of the first ignore bit sequence as a CRC indicator, the CRC indicator indicating that four CRC bits are included in the first ignore bit sequence.

[0017] In a further implementation of the first aspect, the four CRC bits are the LSBs of an 8-bit CRC, and the 8-bit CRC is calculated over the information bits transmitted on the first U-SIG symbol and the second U-SIG symbol.

[0018] In a further implementation of the first aspect, the 8-bit CRC is split into an LSB and an MSB, and the MSB is transmitted on the second U-SIG symbol.

[0019] In a further implementation of the first aspect, the indicator is set to "1" or "0".

[0020] In a further implementation of the first aspect, the PPDU comprises a multi-user (MU) PPDU or a trigger-based (TB) PPDU.

[0021] According to a second aspect of the present disclosure, a method for reducing a peak to average power ratio (PAPR) for transmitting a physical layer protocol data unit (PPDU) includes: operating on a first ignore bit sequence to obtain a second ignore bit sequence, the first ignore bit sequence having all bits set to "1"; and transmitting a PPDU, the PPDU including the second ignore bit sequence.

[0022] In a further implementation of the second aspect, the U-SIG includes at least a first U-SIG symbol and a second U-SIG symbol.

[0023] In a further implementation of the second aspect, operating on the first ignore bit sequence to obtain the second ignore bit sequence includes setting the value of the first ignore bit sequence to a sequence including at least one “0” bit, or changing the value of the verification bit immediately following the first ignore bit sequence to “0” and modifying the value of the first ignore bit sequence to a preset value, or changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit sequence, or replacing part of the first ignore bit sequence with a cyclic redundancy check (CRC).

[0024] In a further implementation of the second aspect, setting the value of the first ignore bit sequence to a sequence including at least one "0" bit comprises setting the first ignore bit sequence of the MU PPDU to one of the sequences in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"}, or setting the value of the TB for the first U-SIG symbol to a sequence including at least one "0" bit. setting the first ignore bit sequence of the PPDU to one of the sequences in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}, or setting the first ignore bit sequence of the TB PPDU for the second U-SIG symbol to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}, or The method includes setting a single global value of the first ignore bit sequence in the first U-SIG symbol for different BW values ​​for the PPDU, wherein the first ignore bit sequence is specifically set as binary "011110", or setting a single global value of the first ignore bit sequence in the second U-SIG symbol for different bandwidth values ​​for the TB PPDU, wherein the first ignore bit sequence is specifically set as binary "01001" or "11110".

[0025] In a further implementation of the second aspect, setting the value of the first ignore bit sequence to a sequence in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"} may mean that when the PPDU is transmitted on a 20 MHz bandwidth, the first ignore bit sequence is set to "00101", or when the PPDU is transmitted on a 40 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "00110", "01001", "01111", "10011"}, or when the PPDU is transmitted on a 40 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "00110", "01001", "01111", "10011"}. The first ignore bit sequence is set to one of {"00101", "01111", "10011", "11000"} when the PPDU is transmitted on an 80 MHz bandwidth, or the first ignore bit sequence is set to one of {"00101", "10101"} when the PPDU is transmitted on a 160 MHz bandwidth, or the first ignore bit sequence is set to one of {"00101", "10110"} when the PPDU is transmitted on a 320 MHz bandwidth, or the first ignore bit sequence is set to "00101" for any bandwidth.

[0026] In a further implementation of the second aspect, changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value includes setting the preset value to "01001" for a 20 MHz bandwidth.

[0027] In a further implementation of the second aspect, changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore includes moving the first ignore bit sequence after the basic service set (BSS) color field and before the TXOP field, or moving the first ignore bit sequence immediately before the BSS color field.

[0028] In a further implementation of the second aspect, replacing a portion of the first ignore bit sequence with a cyclic redundant check (CRC) includes using one bit of the first ignore bit sequence as a CRC indicator, the CRC indicator indicating that four CRC bits are included in the first ignore bit sequence.

[0029] In a further implementation of the second aspect, the four CRC bits are the LSBs of an 8-bit CRC, and the 8-bit CRC is calculated over the information bits transmitted on the first U-SIG symbol and the second U-SIG symbol.

[0030] In a further implementation of the second aspect, the 8-bit CRC is split into an LSB and an MSB, and the MSB is transmitted on the second U-SIG symbol.

[0031] In a further implementation of the second aspect, the indicator is set to "1" or "0".

[0032] In a further implementation of the second aspect, the PPDU comprises a multi-user (MU) PPDU or a trigger-based (TB) PPDU.

[0033] According to a third aspect of the present disclosure, there is provided a computer-readable storage medium storing instructions that, when executed on a computer, enable the computer to perform a method for reducing PAPR according to the second aspect or any one of the possible implementation manners of the second aspect.

[0034] According to a fourth aspect of the present disclosure, there is provided a computer program product comprising instructions, which, when executed on a computer, enable the computer to perform a method for reducing PAPR according to the second aspect or any one of the possible implementations of the second aspect.

[0035] According to a fifth aspect of the present disclosure, there is provided a communication system including a plurality of communication devices, each of which includes an AP and a STA, configured to support a method for reducing PAPR according to the second aspect or any one of possible implementations of the second aspect.

[0036] According to the sixth aspect of the present disclosure, any one computer storage medium or computer program product of the method for reducing PAPR is configured to execute the corresponding method provided above, and therefore, for the beneficial effects that can be achieved by the device, the computer storage medium or the computer program product, reference may be made to the beneficial effects of the corresponding method provided above, and details will not be described again here.

[0037] Other devices, methods, features, and advantages of the present disclosure will be or become apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional devices, methods, features, and advantages be included within this description, be within the scope of the present disclosure, and be protected by the accompanying claims.

[0038] Unless defined otherwise, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art with respect to the embodiments. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the embodiments, exemplary methods and / or materials are described below. In case of conflict, the patent specification, including definitions, will control. Furthermore, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting. [Brief explanation of the drawings]

[0039] Certain embodiments are now described, by way of example only, with reference to the accompanying drawings. Referring now specifically to the drawings in detail, it is emphasized that the details shown are by way of example and for illustrative purposes only. In this regard, the description taken together with the drawings will make apparent to those skilled in the art how the embodiments may be practiced. [Figure 1] 1 illustrates a system for reducing PAPR in a field of a PPDU, according to some embodiments of the present disclosure. [Figure 2] This shows the U-SIG design for MU PPDU in 802.11be Release 1. [Figure 3] This shows the U-SIG design for TB PPDU in 802.11be Release 1. [Figure 4] 10 shows the complimentary cumulative density function (CCDF) of the PAPR of the first U-SIG symbol for 20 MHz BW with MU PPDU. [Figure 5] 1 shows the CCDF of the PAPR of the first U-SIG symbol for 20 MHz BW with MU PPDU. [Figure 6] 2 is a schematic diagram of a possible logical structure of a communication device in the present disclosure, according to some embodiments. [Figure 7] 1 shows the PAPR when the ignore bit sequence is set to "00101" for a 20MHz MU PPDU. [Figure 8] The CCDF of the PAPR of the first U-SIG symbol for 20 MHz BW is shown. [Figure 9] 10 shows the CCDF of the PAPR of the second U-SIG symbol with 20 MHz BW. [Figure 10] 10 shows the PAPR of the first symbol for a 40 MHz MU PPDU with the ignore bit sequence set to decimal 5. [Figure 11]10 shows the PAPR of the second symbol for a 40 MHz MU PPDU with the ignore bit sequence set to one of decimal 5, 6, 15, or 19. [Figure 12] 10 shows the CCDF of the PAPR of the first U-SIG symbol for 40 MHz BW with the ignore bit sequence set to one of decimal 19, 30, 31 or 52 for the TB PPDU. [Figure 13] 10 shows the CCDF of the PAPR of the second U-SIG symbol for 40 MHz BW with the ignore bit sequence set to one of 30, 39, 45, or 54 in decimal format. [Figure 14] 10 shows the PAPR for an 80 MHz MU PPDU of the first U-SIG symbol with the ignore bit sequence set to one of decimal 5, 15, or 24. [Figure 15] 10 shows the PAPR for an 80 MHz MU PPDU of the second U-SIG symbol with the ignore bit sequence set to one of decimal 5 or 19. [Figure 16] 10 shows the PAPR for an 80 MHz TB PPDU of the first U-SIG symbol with the ignore bit sequence set to one of decimal 30, 44, or 56. [Figure 17] 10 shows the PAPR of the second symbol for an 80 MHz TB PPDU having an ignore bit sequence set to decimal 30 in the first U-SIG symbol and one of decimal 9, 26, 27, 30, or 31 for the second U-SIG symbol. [Figure 18] 10 shows the PAPR of the second symbol for a 160 MHz MU PPDU with the ignore bit sequence set to decimal 5 or 21 in the first U-SIG symbol. [Figure 19] 1 shows the PAPR of the first symbol for a 160 MHz TB PPDU having the ignore bit sequence set to one of decimal 30, 51, or 57 in the first U-SIG symbol. [Figure 20] 10 shows the PAPR of the first symbol for a 320 MHz MU PPDU with the ignore bit sequence set to decimal 5 or 22 in the first U-SIG symbol. [Figure 21] 10 shows the PAPR of the second symbol for a 320 MHz MU PPDU with the ignore bit sequence set to 5 or 19 or 21. [Figure 22] 10 shows the PAPR of the first U-SIG symbol for a 320 MHz TB PPDU having an ignore bit sequence set to one of decimal 18, 30, 31, 37, or 56 in the first U-SIG symbol. [Figure 23] 10 shows the PAPR of the second U-SIG symbol for a 320 MHz TB PPDU with an ignored bit sequence. [Figure 24] 10 shows the PAPR of the second symbol for a 160 MHz TB PPDU having an ignore bit sequence set to decimal 30 in the first U-SIG symbol and one of decimal 9, 15, 29, or 30 in the second U-SIG symbol. [Figure 25] 1 shows the CCDF for a 20 MHz MU PPDU with the validation bit set to binary '0' and the ignore bit sequence set to decimal 9. [Figure 26] 10 shows the structure of the MU PPDU after rearrangement of the ignored bit sequence after the BSS color field. [Figure 27] 10 shows the PAPR for a 20 MHz MU PPDU of the first U-SIG symbol by rearranging the ignore bit sequence after the BSS color field. [Figure 28] 10 shows the PAPR for a 20 MHz MU PPDU of the second U-SIG symbol by rearranging the ignore bit sequence after the BSS color field. [Figure 29] 10 shows the structure of the MU PPDU after rearrangement of the ignore bit sequence before the BSS color field. [Figure 30]10 shows the PAPR for a 20 MHz MU PPDU of the first U-SIG symbol by rearranging the ignore bit sequence before the BSS color field. [Figure 31] 10 shows the PAPR for a 20 MHz MU PPDU of the second U-SIG symbol by rearranging the ignore bit sequence before the BSS color field. [Figure 32] Indicates that the ignored bit sequence in the first U-SIG symbol is replaced by an indicator and the four LSB CRC bits. [Figure 33] 1 shows the PAPR for the 20 MHz MU PPDU of the first U-SIG symbol by replacing the ignored bit sequence of the first U-SIG symbol with the four LSB CRC bits and one indicator bit. [Figure 34] 10 shows the PAPR for a 20 MHz MU PPDU of the second U-SIG symbol by replacing the ignored bit sequence of the second U-SIG symbol with the four MSB CRC bits. DETAILED DESCRIPTION OF THE INVENTION

[0040] Before describing at least one embodiment in detail, it is to be understood that the embodiments are not necessarily limited in their application to the details of construction and arrangement of components and / or methods set forth in the following description and / or illustrated in the drawings and / or examples. Implementations described herein are capable of other embodiments or of being practiced or carried out in various ways.

[0041] FIG. 1 illustrates a system for reducing PAPR in a field of a PPDU according to some embodiments of the present disclosure. System 100 includes an access point (AP) 101 and one or more stations (STAs), such as STA 102, STA 103, and STA 104 shown in FIG. 1 . System 100 is also referred to as a basic service set (BSS) in this disclosure. AP 101 and / or STAs in system 100 are both referred to as communication devices. In some embodiments, a communication device may function as an AP, and in some other embodiments, a communication device may function as a STA. In system 100, the AP and STAs communicate on both the downlink and the uplink. The arrow between the AP and STAs shown in FIG. 1 indicates only the downlink, but this should not be understood as a transmission limitation.

[0042] Although system 100 shows only one AP in the system, the system may include more than one AP in the system, and the APs in the system may perform cooperative transmissions.

[0043] The system 100 in this disclosure includes, but is not limited to, a wireless fidelity (WIFI) communication system, a narrowband internet of things (NB-IoT) system, a long term evolution (LTE) system, a fifth generation mobile communication system (5G) or later, a machine to machine (M2M) communication system, etc. The LTE system and the 5G or later may be integrated with the WIFI system.

[0044] In the present disclosure, the communication device may be an AP 101 or a STA, and the STA may be, for example, a mobile phone, an intelligent terminal, a tablet computer, a notebook computer, a video game console, a multimedia player, a vehicle that supports WIFI, a device-to-device (D2D) device, or any smart device. The AP and / or the STA may be a fixed or mobile device.

[0045] The WIFI system may support all Institute of Electrical and Electronic Engineers (IEEE) 802.11 serial standards, including but not limited to 802.11a / b / g, 802.11n, 802.11ac, 802.11be, 802.11ax, or later.

[0046] Figure 2 shows the U-SIG design for the MU PPDU in 802.11be Release 1. The bits included in the first symbol of the U-SIG of the MU PPDU convey information such as the physical layer (PHY) version (e.g., 802.11be or a later version of the standard), the bandwidth (BW) (e.g., 20 MHz, 40 MHz, etc.), whether it is a downlink (DL) or uplink (UL) transmission, a BSS color that is possibly used to distinguish between different adjacent BSS values, a transmission opportunity (TXOP) that may include the duration of the TXOP, and / or how long the transmitter is utilizing the channel resources.

[0047] The bits included in the second symbol of the U-SIG for the MU PPDU convey information about the PPDU type (e.g., MU PPDU, TB PPDU) and compression (e.g., non-OFDMA PPDU with reduced signaling), channel puncturing, the modulation and coding scheme (MCS) used for the EHT-SIG field, and the number of OFDM symbols used for the EHT-SIG field, a CRC, and six zero-tail bits used for the convolutional code.

[0048] Figure 3 shows the U-SIG design for the TB PPDU in 802.11be Release 1. The bits included in the first symbol of the U-SIG for the TB PPDU convey information about the PHY version (e.g., 802.11be or a later version of the standard), the BW (e.g., 20 MHz, 40 MHz, etc.), whether it is a DL or UL transmission, the BSS color that potentially distinguishes between different adjacent BSS values, the TXOP, which may include the duration of the TXOP, and / or how long the transmitter is utilizing the channel resource. The bits included in the second symbol of the U-SIG for the TB PPDU convey information about the PPDU type (e.g., MU, TB), the spatial reuse (e.g., spatial reuse 1 and spatial reuse 2) that allows multiple transmitters to transmit simultaneously on the same resource, the MCS used for the EHT-SIG field, the number of OFDM symbols used for the EHT-SIG field, the CRC, and six zero-tail bits used for the convolutional code.

[0049] As shown in both Figures 2 and 3, the ignored bits are located in the first U-SIG symbol (and also in the second U-SIG symbol for the TB PPDU), but since the CRC is calculated as a function of all preceding bits including both the first and second U-SIG symbols, the value of the CRC bits (located in the second U-SIG symbol) is a function of the ignored bits located in the first U-SIG symbol.

[0050] It should be noted that in some embodiments of the present disclosure, ignore bits are also referred to as ignore bit sequences. Ignored bits and ignore bit sequences may be used interchangeably in the present disclosure.

[0051] In the current protocol, the ignore bit sequence is 5 bits, and in the MU PPDU type, all bits are set to "1", or in other words, the ignore bit sequence in the MU PPDU is set to 31 in decimal format.

[0052] In 802.11ax, the trigger frame contains nine reserved bits, all nine of which are set to "1." The nine reserved bits are copied to the second symbol of the HE-SIG-A field of the TB PPDU. In the current stage of 802.11be development, for the TB PPDU, there are six ignore bits in the first U-SIG symbol and five ignore bits in the second U-SIG symbol. All ignore bits are currently (in the current stage of 802.11be development) defined as being copied from the trigger frame (similar to 802.11ax operation). Keeping the same design in 11be as in 11ax, the ignore bits copied from the trigger frame are set to "1."

[0053] Although the structure of the trigger frame is not presented in this disclosure, the ignored bit sequences within the trigger frame, MU PPDU, and TB PPDU contain consecutive binary "1" bits that may result in a high PAPR, with the performance of the U-SIG field for the MU PPDU and TB PPDU being affected as a result (e.g., with a lower PAPR, the power amplifier backoff can be reduced, thereby increasing efficiency).

[0054] Figure 4 shows the complementary cumulative density function (CCDF) of the PAPR of the first U-SIG symbol for 20 MHz bandwidth for an MU PPDU. SIG-1 in Figure 4 refers to the first symbol of the U-SIG field. In prior art designs, the PAPR of the U-SIG symbol is high for all bandwidth scenarios. For example, for 20 MHz, the CCDF of the PAPR of the first U-SIG symbol is compared with that of the data portion (assuming MCS 0 = BPSK rate 1 / 2) and the legacy signal (L-SIG) field.

[0055] As shown in Figure 4, the PAPR of U-SIG-1 is, on average, higher than that of the data for most ranges. Also, due to the large number of fixed bits, it is not smooth (contains "steps"), which means that the central limit theorem does not apply and therefore the distribution of the time-domain signal is not complex Gaussian.

[0056] Figure 5 shows the CCDF of the PAPR of the first U-SIG symbol for 40 MHz BW. U-SIG-1 in Figure 5 refers to the first symbol of the U-SIG field. Current standards specify that the pre-EHT field, which is replicated every 20 MHz (e.g., L-SIG, U-SIG, etc.), undergoes a phase rotation every 20 MHz to reduce the PAPR. However, as shown in Figure 5 for the first U-SIG symbol in the 40 MHz case, the PAPR of the U-SIG is higher than both the data and L-SIG, which means that it is a limiting factor for performance (power amplifier backoff may be defined).

[0057] Therefore, based on the simulation results from Figures 4 and 5, it can be seen that it is important to reduce the PAPR of the U-SIG field.

[0058] To solve the above problems, the present disclosure provides a method and / or apparatus for reducing the PAPR of a trigger frame, a MU PPDU, and a TB PPDU. The present disclosure also provides a communications device including: a processor configured to operate on a first ignore bit sequence to obtain a second ignore bit sequence, where the first ignore bit sequence has all bits set to "1"; and a transmitter configured to transmit a PPDU, where the PPDU includes the second ignore bit sequence. It should be noted that the method and / or apparatus provided in the present disclosure may not be limited to being used for any other PPDU or frame having the same problem.

[0059] Embodiments present in this disclosure may be systems, methods and / or computer program products, which may include a computer-readable storage medium (or media) having computer-readable program instructions for causing a processor to perform aspects of the embodiments.

[0060] A computer-readable storage medium may be a tangible device that can hold and store instructions for use by an instruction-execution device. The computer-readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above.

[0061] A non-exhaustive list of more specific examples of computer-readable storage media includes portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM, or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital versatile disk (DVD), memory stick, floppy disk, and any suitable combination of the above.

[0062] As used herein, computer-readable storage media should not be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., light pulses passing through a fiber optic cable), or electrical signals transmitted through wires.

[0063] The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to the respective computing / processing device or to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. A network adapter card or network interface within each computing / processing device may receive the computer-readable program instructions from the network and transfer the computer-readable program instructions for storage in a computer-readable storage medium within the respective computing / processing device.

[0064] Computer readable program instructions for carrying out operations of embodiments may be either assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" programming language or similar programming languages.

[0065] The computer readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection to the external computer may be made (e.g., through the Internet using an Internet Service Provider).

[0066] In some embodiments, electronic circuitry including, for example, a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA) may execute computer-readable program instructions by utilizing state information of the computer-readable program instructions to personalize the electronic circuitry to perform aspects of the embodiments.

[0067] 6 is a schematic diagram of a possible logical structure of a communication device in the present disclosure, according to some embodiments. The communication device includes a processor 602. In some embodiments of the present disclosure, the processor 602 may be configured to control and manage one or more actions of the communication device, such as executing code to operate on the first ignored bit sequence to reduce PAPR and / or to process data transmitted and / or received at an AP. Optionally, the communication device may further include a memory 601 and a communication interface 603. The processor 602, the communication interface 603, and the memory 601 may be connected to each other or may be connected to each other using a bus 604. The communication interface 603 is configured to support the communication device in performing communications, and the memory 601 is configured to store program code and data for the communication device. The processor 602 invokes code stored in the memory 601 to perform control and management. The memory 601 may or may not be coupled to the processor 602.

[0068] The processor 602 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The processor 602 may implement or execute various exemplary logic blocks, modules, and circuits described with reference to the subject matter disclosed in this disclosure. Alternatively, the processor 602 may be a combination of processors that implement computing functions, such as a combination of one or more microprocessors, or a combination of a digital signal processor and a microprocessor. The bus 604 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be categorized as an address bus, a data bus, a control bus, or the like.

[0069] According to the communication device provided above, in some embodiments, the U-SIG may include at least a first U-SIG symbol and a second U-SIG symbol.

[0070] In some embodiments, the operation on the first ignore bit sequence to obtain the second ignore bit sequence may include setting the value of the first ignore bit sequence to a sequence including at least one "0" bit, or changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value, or changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit sequence, or replacing a portion of the first ignore bit sequence with a cyclic redundancy check (CRC).

[0071] The first ignore bit sequence in this disclosure may be a predefined bit sequence in the prior art, e.g., current IEEE protocols. In some embodiments, the first ignore bit sequence may be 5 or 6 bits, e.g., all bits set as binary "1" in an MU PPDU or a TB PPDU. The first ignore bit sequence may indicate 6 ignore bits in the first U-SIG symbol in the TB PPDU and / or 5 ignore bits in the second U-SIG symbol in the TB PPDU. It should be noted that the ignore bit sequence may include other numbers of binary bits, and 5 or 6 bits is not a limitation of this disclosure.

[0072] In one embodiment, the value of the first ignore bit sequence is set to a sequence that includes at least one "0" bit of a binary number. Optionally, the first ignore bit sequence may further include at least one "1" bit of a binary number. The at least one "0" bit of the binary number may be any bit of the ignore bit sequence.

[0073] The first ignore bit sequence being set to a sequence including at least one binary "0" bit means that the first ignore bit sequence of the MU PPDU is set to one of the sequences in the binary set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"}, or the TB for the first U-SIG symbol. The first ignore bit sequence of the PPDU is set to one of the sequences in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}, or the first ignore bit sequence of the TB PPDU for the second U-SIG symbol is set to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}, or the first ignore bit sequence of the TB PPDU for the second U-SIG symbol is set to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"} This may include setting a single global value for the first ignore bit sequence in the first U-SIG symbol for different BW values ​​for the PPDU, with the first ignore bit sequence being specifically set as binary "011110", or setting a single global value for the first ignore bit in the second U-SIG symbol for different bandwidth values ​​for the TB PPDU, with the first ignore bit sequence being specifically set as binary "01001" or "11110".

[0074] If the first ignore bit sequence of the TB PPDU for the first U-SIG symbol is set to one of the sequences in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}, the first ignore bit sequence of the TB PPDU for the second U-SIG symbol may be copied from the trigger frame. It should be understood that the first ignored bit sequence of the TB PPDU for the second U-SIG symbol may be set to any other value within the set, for example, {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}. The value of the first ignored bit sequence of the TB PPDU for the second U-SIG symbol is not limited to this case.

[0075] If the first ignored bit sequence of the TB PPDU for the second U-SIG symbol is set to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}, the first ignored bit sequence of the TB PPDU for the first U-SIG symbol may be set to, for example, binary "011110" (decimal 30). It should be understood that the first ignore bit sequence of the TB PPDU for the first U-SIG symbol may be set to any other value in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}.

[0076] In one embodiment, for a 20 MHz MU PPDU, the ignore bit sequence may be set to, for example, "00101" (5 in decimal format). For the ignore bit sequence of the first symbol of a TB PPDU, it may include 6 bits, and the MSB or LSB bit may be set to binary "0" or "1", depending on the definition of the standard.

[0077] Figure 7 shows the PAPR when the ignore bit sequence is set to "00101" for a 20MHz MU PPDU. It can be seen that the PAPR is significantly improved when the ignore bit sequence contains at least one binary "0".

[0078] In one embodiment, for a TB PPDU with 20 MHz BW, replace the sequence of six ignore bits in the first U-SIG symbol with one of the binary numbers {"010100", "011101", "011110", "011111"} (decimal numbers 20, 29, 30 and 31 respectively) and copy the five ignore bits in the second U-SIG symbol from the trigger. It should be noted that the set of binary numbers {"010100", "011101", "011110", "011111"} is a subset of {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}.

[0079] Selecting a disregard bit sequence with decimal 31 or 30 in the first U-SIG symbol also results in a lower PAPR in the second U-SIG symbol.

[0080] Figure 8 shows the CCDF of the PAPR of the first U-SIG symbol for 20 MHz BW. The ignored bits in the second U-SIG symbol are assumed to be all 1's (e.g., "11111").

[0081] In one embodiment, for a TB PPDU with 20 MHz BW, the six ignored bits in the first U-SIG symbol are replaced with the binary number "011110" (30 in decimal format) and the five ignored bits in the second U-SIG symbol are replaced with one of the set {"01001", "11010", "11011", "11110"} (9, 26, 27 and 30 in decimal format, respectively).

[0082] FIG. 9 shows the CCDF of the PAPR of the second U-SIG symbol with 20 MHz BW.

[0083] In one embodiment, for a 40 MHz MU PPDU, the ignore bit sequence of the first symbol may be set to, for example, binary "00101" (5 in decimal format) or binary "01001" (9 in decimal format).

[0084] 10 shows the PAPR of the first symbol for a 40 MHz MU PPDU with the ignore bit sequence set to decimal 5. It can be seen that the ignore bit sequence of this embodiment can improve the PAPR of the first symbol.

[0085] The ignore bit sequence of the MU PPDU may be set to, for example, one of the binary set {"00101", "00110", "01111", "10011"} (decimal values ​​5, 6, 15 and 19, respectively), thereby improving the PAPR of the second U-SIG symbol.

[0086] Figure 11 shows the PAPR of the second symbol for a 40 MHz MU PPDU with the ignore bit sequence set to one of the decimal numbers 5, 6, 15, or 19. It can be seen that the PAPR is significantly improved when the ignore bit sequence is set to one of the binary numbers {"00101", "00110", "01111", "10011"}.

[0087] In one embodiment, for a TB PPDU with a 40 MHz bandwidth, the 6-bit ignore bit sequence in the first U-SIG symbol may be replaced with {"010011", "011110", "011111", "110100"} (19, 30, 31, and 52 in decimal format, respectively), and the 5-bit ignore bit sequence in the second U-SIG symbol may be copied from the trigger frame. Figure 12 shows the CCDF of the PAPR of the first U-SIG symbol for a 40 MHz bandwidth with the ignore bit sequence set to one of decimal numbers 19, 30, 31, or 52 for a TB PPDU. In this case, the PAPR of the first symbol for a 40 MHz bandwidth can be improved. It should be noted that the set of binary numbers {"010100", "011101", "011110", "011111"} is a subset of {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}.

[0088] Figure 13 shows the CCDF of the PAPR of the second U-SIG symbol for 40 MHz BW with the ignore bit sequence set to one of decimal formats 30, 39, 45, or 54. It can be seen that selecting the ignore bit sequence set to decimal 30 in the first U-SIG symbol also results in a lower PAPR in the second U-SIG symbol. Other values ​​for reducing the PAPR of the second U-SIG symbol are also noted.

[0089] In one embodiment, for an 80 MHz MU PPDU considering the first U-SIG symbol, the ignore bit sequence may be set to one of the binary numbers {"00101", "01111", "11000"} (5, 15 and 24 in decimal format, respectively).

[0090] Figure 14 shows the PAPR for an 80 MHz MU PPDU of the first U-SIG symbol with the ignore bit sequence set to one of the decimal values ​​5, 15 or 24. It can be seen that the ignore bit sequence set to one of the decimal values ​​5, 15 or 24 improves the PAPR of the first U-SIG symbol.

[0091] In one embodiment, for an 80 MHz MU PPDU considering the second U-SIG symbol, the ignore bit sequence may be set to the binary numbers {"00101", "10011"} (5 and 19 in decimal format, respectively).

[0092] Figure 15 shows the PAPR for an 80 MHz MU PPDU of the second U-SIG symbol with the ignore bit sequence set to one of decimal 5 or 19. It can be seen that the ignore bit sequence set to decimal 5 or 19 can improve the PAPR of the second U-SIG symbol.

[0093] To improve the PAPR of both the first and second U-SIG symbols, the optimal ignore bit sequence may be set to binary "00101" for the 80 MHz MU PPDU.

[0094] In one embodiment, for a TB PPDU with 80 MHz BW, the 6-bit ignore bit sequence in the first U-SIG symbol may be replaced with binary numbers {"011100", "011111", "100010", "111000"} (decimal numbers 28, 31, 34 and 56 respectively), and the 5-bit ignore bit sequence in the second U-SIG symbol may be copied from the trigger frame. It should be noted that the set of binary numbers {"010100", "011101", "011110", "011111"} is a subset of {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}.

[0095] Figure 16 shows the PAPR for an 80 MHz TB PPDU of the first U-SIG symbol with the ignore bit sequence set to one of decimal 30, 44, or 56. The ignore bit sequence set to one of decimal 30, 44, or 56 can improve the PAPR of the first U-SIG symbol. The ignore bit sequence in the second U-SIG symbol is all binary "1's."

[0096] In one embodiment, for a TB PPDU with 80 MHz BW, the 6-bit ignore bit sequence in the first U-SIG symbol is replaced with the binary number "011110" (30 in decimal format), and the 5-bit ignore bit sequence in the second U-SIG symbol is replaced with one of the binary numbers {"001001", "011010", "011011", "011110", "011111"} (9, 26, 27, 30 and 31 in decimal format, respectively).

[0097] Figure 17 shows the second symbol PAPR for an 80 MHz TB PPDU with the ignore bit sequence set to decimal 30 in the first U-SIG symbol and one of decimal 9, 26, 27, 30, or 31 for the second U-SIG symbol. It can be seen that the PAPR can be improved by having the ignore bit sequence set to decimal 30 in the first U-SIG symbol and one of decimal 9, 26, 27, 30, or 31 for the second U-SIG symbol.

[0098] In one embodiment, for a 160 MHz MU PPDU, the ignore bit sequence may be set to one of the binary values ​​{"00101", "10101"} (5 and 21 in decimal format, respectively). Figure 18 shows the PAPR of the second symbol for a 160 MHz MU PPDU with the ignore bit sequence set to decimal values ​​5 or 21 in the first U-SIG symbol. The decimal value 21 provides the best improvement for the second U-SIG symbol, and the decimal value 5 provides a similar (almost good) improvement.

[0099] In one embodiment, for a TB PPDU with 160 MHz BW, the 6-bit ignore bit sequence in the first U-SIG symbol may be replaced with binary numbers {"011110", "110011", "111001"} (decimal numbers 30, 51 and 57 respectively), and the 5-bit ignore bits in the second U-SIG symbol may be copied from the trigger frame. It should be noted that the set of binary numbers {"010100", "011101", "011110", "011111"} is a subset of {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "'011111", "100101", "100010", "110100", "111000", "111001"}.

[0100] Figure 19 shows the PAPR of the first symbol for a 160 MHz TB PPDU with the ignore bit sequence set to one of decimal 30, 51, or 57 in the first U-SIG symbol. In this case, the PAPR for the first U-SIG symbol can be improved. The ignore bits in the second U-SIG symbol are assumed to be all set to binary "1."

[0101] In one embodiment, for a TB PPDU with 160 MHz BW, the 6-bit ignore bit sequence in the first U-SIG symbol is replaced with binary "011110" (30 in decimal format), and the 5-bit ignore bit sequence in the second U-SIG symbol is replaced with one of {"01001", "01111", "11101", "11110"} (9, 15, 29 and 30 in decimal format, respectively).

[0102] In one embodiment, for a 320 MHz MU PPDU, the ignore bit sequence may be set to one of the binary values ​​{"00101", "10110"} (5 and 22 in decimal format, respectively). Figure 20 shows the first symbol PAPR for a 320 MHz MU PPDU with the ignore bit sequence set to decimal values ​​5 or 22 in the first U-SIG symbol. Figure 21 shows the second symbol PAPR for a 320 MHz MU PPDU with the ignore bit sequence set to 5, 19, or 21. The decimal value 19 provides the best improvement for the second U-SIG symbol, and the decimal value 5 provides a similar (almost good) improvement.

[0103] In one embodiment, for a TB PPDU with 320 MHz BW, the 6-bit ignore bit sequence in the first U-SIG symbol may be replaced with binary numbers {"010010", "011110", "011111", "100101", "111000"} (decimal numbers 18, 30, 31, 37, 56 respectively), and the 5-bit ignore bits in the second U-SIG symbol may be copied from the trigger frame. It should be noted that the set of binary numbers {"010010", "011110", "011111", "100101", "111000"} is a subset of {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "'011111", "100101", "100010", "110100", "111000", "111001"}.

[0104] Figure 22 shows the first symbol PAPR for a 320 MHz TB PPDU with the ignore bit sequence set to one of decimal 18, 30, 31, 37, or 56 in the first U-SIG symbol. In this case, the PAPR for the first U-SIG symbol can be improved. The ignore bits in the second U-SIG symbol are assumed to be all set to binary "1."

[0105] In one embodiment, for a TB PPDU with a 320 MHz bandwidth, the 6-bit ignore bit sequence in the first U-SIG symbol is replaced with binary "011110" (30 in decimal format), and the 5-bit ignore bit sequence in the second U-SIG symbol is replaced with one of {"01001", "01101", "11110"} (9, 13, and 30 in decimal, respectively). Figure 23 shows the PAPR of the second U-SIG symbol for a 320 MHz TB PPDU with the ignore bit sequence set to one of 9, 13, or 30 in the second U-SIG symbol when the ignore bit sequence in the first U-SIG symbol is set to 30 (in decimal format). In this case, the PAPR for the second U-SIG symbol can be improved.

[0106] In one embodiment, a single global value of ignore bits is used in the first U-SIG symbol to reduce the PAPR for all BW values ​​for the TB PPDU. For example, looking at the results from the previous embodiment, replacing the first ignore bit sequence with decimal 30 can result in an improvement in the PAPR for all BW values.

[0107] In one embodiment, a single global value of ignore bits is used in the second U-SIG symbol to reduce the PAPR for all BW values ​​for the TB PPDU. For example, looking at the results from the previous section, replacing the first ignore bit sequence with decimal 9 or 30 can result in an improvement in the PAPR for all BW values.

[0108] Figure 24 shows the PAPR of the second symbol for a 160 MHz TB PPDU with the ignore bit sequence set to decimal 30 in the first U-SIG symbol and one of decimal 9, 15, 29, or 30 in the second U-SIG symbol, which can improve the PAPR for the second U-SIG symbol.

[0109] In one embodiment, a single global value of ignore bits is used to reduce the PAPR for all BW values ​​for the MU PPDU. For example, looking at the results from the previous embodiment, an improvement in PAPR can be obtained for all BW values ​​by using the decimal ignore bit sequence "00101" (decimal 5).

[0110] In one embodiment, the operation on the first ignore bit sequence may include changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value. For example, for a 20 MHz MU PPDU, using an ignore bit sequence of binary "01001" (decimal 9) and a verification bit of binary "0" results in an improvement in PAPR. Figure 25 shows the CCDF for a 20 MHz MU PPDU with the verification bit set to binary "0" and the ignore bit sequence set to decimal 9.

[0111] In one embodiment, the action on the first ignore bit sequence may include changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit. The first ignore bit sequence may be moved after the basic service set (BSS) color field and before the TXOP field, or may be moved immediately before the BSS color field.

[0112] One option is a combination of rearranging the ignore bit sequence and changing the value of the ignore bit sequence such that the PAPR is reduced, for example, by moving the ignore bit sequence of the MU PPDU after the BSS Color field and before the TXOP field. Figure 26 shows the structure of the first symbol of the U-SIG field for the MU PPDU after rearranging the ignore bit sequence after the BSS Color field.

[0113] Figure 27 shows the PAPR for the 20MHz MU PPDU of the first U-SIG symbol by rearranging the ignore bit sequence after the BSS color field, and Figure 28 shows the PAPR for the 20MHz MU PPDU of the second U-SIG symbol by rearranging the ignore bit sequence after the BSS color field. It can be seen that the PAPR of both symbols is improved. The ignore bit sequence is set to a different value, which can be seen from Figures 27 and 28.

[0114] It should be understood that the changed values ​​for the first ignore bit sequence in Figures 27 and 28 are only examples for a 20 MHz MU PPDU, but it is easy for those skilled in the art to understand that the values ​​used for the first ignore bit sequence for both the MU PPDU and / or the TB PPDU for different BW values ​​may be any of the values ​​presented in the previous embodiments.

[0115] Another possible option is to move the ignore bit sequence of the MU PPDU before the BSS color field. Figure 29 shows the structure of the MU PPDU after rearranging the ignore bit sequence before the BSS color field.

[0116] Figure 30 shows the PAPR for the 20 MHz MU PPDU of the first U-SIG symbol by rearranging the ignore bit sequence before the BSS color field, and Figure 31 shows the PAPR for the 20 MHz MU PPDU of the second U-SIG symbol by rearranging the ignore bit sequence before the BSS color field. It can be seen that the PAPR results are even better than the previous rearrangement, and that an ignore bit sequence value of decimal 16 yields good PAPR results for both symbols.

[0117] In one embodiment, the operation on the first ignore bit sequence may include replacing a portion of the first ignore bit sequence with a cyclic redundancy check (CRC). This operation may replace the 5-bit ignore bit sequence in the first U-SIG symbol with a single bit set to "1" to indicate that it is followed by four CRC LSB bits (of an 8-bit CRC). Alternatively, it may be set to "0" to indicate that it is followed by four CRC LSB bits. Alternatively, the LSB bit of the ignore bit sequence is used to indicate that the four MSB bits of the ignore bit sequence are used for the four CRC LSB bits. It should be understood that the remaining four bits, excluding the indication bit of the ignore bit sequence, may also be used to carry the four CRC MSB bits. This disclosure uses the four CRC LSB bits to be carried in the ignore bit sequence of the first U-SIG symbol as an example.

[0118] An 8-bit CRC is calculated over two U-SIG symbols from which the four CRC LSB bits are extracted. The 8-bit CRC is calculated over 38 bits including PHY version, BW, DL / UL, BSS color, TXOP, "1", verify, PPDU type, verify, punctured channel, verify, EHT SIG MCS, and #EHT Sig symbol. The 8-bit CRC is then split across the two U-SIG symbols.

[0119] 32 shows that the ignored bit sequence of the first U-SIG symbol is replaced by an indicator and four LSB CRC bits. It should be understood that the indicator bit may also be set as "0", the four CRC LSB bits in the first U-SIG symbol may also be four CRC MSB bits, and the four CRC MSB bits in the second U-SIG symbol may also be four CRC LSB bits.

[0120] Figure 33 shows the PAPR for a 20 MHz MU PPDU of the first U-SIG symbol by replacing the ignored bit sequence of the first U-SIG symbol with four LSB CRC bits and one indicator bit. Figure 34 shows the PAPR for a 20 MHz MU PPDU of the second U-SIG symbol by replacing the ignored bit sequence of the first U-SIG symbol with four LSB CRC bits. While the PAPR is not significantly reduced for the first U-SIG symbol, it is much smoother than before replacing the ignored bits with four LSB CRC bits and one indicator bit. The PAPR for the second U-SIG symbol is consistently reduced and smoother. Using this modification further reduces false alarms for U-SIG detection because the CRC transmitted is longer.

[0121] The description of various embodiments is presented for illustrative purposes, but is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or technical improvements over technologies found in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0122] The words "comprises," "comprising," "includes," "including," "having," and their conjugations mean "including but not limited to."

[0123] As used herein, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include a plurality of compounds, including mixtures of compounds.

[0124] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments and / or to exclude the incorporation of features from other embodiments.

[0125] The word "optionally" is used herein to mean "provided in some embodiments and not provided in other embodiments." Any particular embodiment may include multiple "optional" features unless such features are inconsistent.

[0126] Throughout this application, various embodiments may be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the embodiments.

[0127] It will be appreciated that certain features of embodiments that are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of an embodiment that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as appropriate in any other described embodiment. Certain features described in the context of various embodiments should not be considered essential features of those embodiments unless the embodiment is inoperable without those elements.

[0128] While the embodiments have been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and broad scope of the appended claims.

[0129] Although this disclosure describes a solution for reducing PAPR from the perspective of an apparatus, it is clear that one skilled in the art will understand that the problem to be addressed in this disclosure can also be realized by a method and / or a system. Methods for reducing PAPR will not be detailed to avoid redundancy.

[0130] It is the intention of the applicants that all publications, patents, and patent applications referenced in this specification be incorporated by reference in their entirety into this specification as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference herein. Furthermore, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the embodiments. To the extent section headings are used, they should not be construed as necessarily limiting.

Claims

1. 1. A communications device used to transmit a physical layer protocol data unit (PPDU) to one or more receiving devices, the PPDU including a universal signaling (U-SIG) field, comprising: a processor configured to operate on the first disregard bit sequence to obtain a second disregard bit sequence, the first disregard bit sequence having all bits set to "1" and the second disregard bit sequence including at least one binary "0"; a transmitter configured to transmit the PPDU, the PPDU including the second ignore bit sequence; a communication device including

2. The communications device of claim 1 , wherein the U-SIG field includes at least a first U-SIG symbol and a second U-SIG symbol.

3. The operation on the first ignore bit sequence to obtain the second ignore bit sequence comprises: setting the value of the first ignore bit sequence to a sequence containing at least one "0" bit; or changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value; or changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit sequence; or replacing a portion of the first ignored bit sequence with a cyclic redundancy check (CRC); 3. A communication device according to claim 1 or 2, comprising:

4. Setting the value of the first ignore bit sequence to a sequence including at least one "0" bit includes: setting the first ignore bit sequence of the MU PPDU to one of the sequences in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"}; or setting the first ignored bit sequence of a TB PPDU for a first U-SIG symbol to one of the sequences in the set {"010010", "010011", "010100", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}; or setting the first ignore bit sequence of the TB PPDU for the second U-SIG symbol to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}; or setting a single global value of the first ignore bit sequence in the first U-SIG symbol for different BW values ​​for TB PPDU, the first ignore bit sequence being specifically set as binary "011110"; or Setting a single global value of the first ignore bit sequence in the second U-SIG symbol for different bandwidth values ​​for TB PPDU, the first ignore bit sequence being specifically set as binary "01001" or "11110". The communication device of claim 3 , comprising:

5. Setting the value of the first ignore bit sequence of a MU PPDU to one of the sequences in the set {"00101", "00110", "01001", "01111", "10011", "10101", "11000", "10110"}, When the PPDU is transmitted on a 20 MHz bandwidth, the first ignore bit sequence is set to "00101", or When the PPDU is transmitted on a 40 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "00110", "01001", "01111", "10011"}; or When the PPDU is transmitted on an 80 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "01111", "10011", "11000"}; or When the PPDU is transmitted on a 160 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "10101"}; or When the PPDU is transmitted on a 320 MHz bandwidth, the first ignore bit sequence is set to one of {"00101", "10110"}; or the first ignore bit sequence is set to "00101" for any bandwidth; Including, setting the first ignored bit sequence of a TB PPDU for a first U-SIG symbol to one of the sequences in the set {"010010", "010011", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}; the first ignore bit sequence of a TB PPDU for the first U-SIG symbol is set to one of the sequences in the set {"010010", "010011", "010101", "011100", "011101", "011110", "011111", "100101", "100010", "110100", "111000", "111001"}; and the first ignore bit sequence of a TB PPDU for the second U-SIG symbol is copied from a trigger frame; setting the first ignored bit sequence of a TB PPDU for a second U-SIG symbol to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}; 5. The communications device of claim 4, wherein the first ignored bit sequence of a TB PPDU for the second U-SIG symbol is set to one of the sequences in the set {"01001", "01101", "01111", "11010", "11011", "11101", "11110", "11111"}, and the first ignored bit sequence of a TB PPDU for the first U-SIG symbol is set to binary "011110".

6. Changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value includes:

4. The communication device of claim 3, wherein the preset value is set to "01001" for a 20 MHz bandwidth.

7. Changing the position of the first ignore bit sequence in a U-SIG field and changing the value of the first ignore bit sequence includes: moving the first ignore bit sequence after a basic service set (BSS) color field and before a TXOP field; or The communication device of claim 3 , further comprising moving the first ignore bit sequence immediately before a BSS color field.

8. Replacing a portion of the first ignored bit sequence with a cyclic redundancy check (CRC) 4. The communication device of claim 3, wherein one bit of the first ignore bit sequence is a CRC indicator, and the CRC indicator indicates that four CRC bits are included in the first ignore bit sequence.

9. 9. The communications device of claim 8, wherein the four CRC bits are LSBs of an 8-bit CRC, the 8-bit CRC being calculated over information bits transmitted on a first U-SIG symbol and a second U-SIG symbol.

10. 10. The communications device of claim 9, wherein the 8-bit CRC is split into a least significant bit (LSB) and an most significant bit (MSB), and the most significant bit (MSB) is transmitted on the second U-SIG symbol.

11. A communication device according to any one of claims 8 to 10, wherein the indicator is set to "1" or "0".

12. 12. The communications device of claim 1, wherein the PPDU comprises a multi-user (MU) PPDU or a trigger-based (TB) PPDU.

13. 1. A method for reducing peak-to-average power ratio (PAPR) for transmitting a physical layer protocol data unit (PPDU), comprising: operating on the first ignore bit sequence to obtain a second ignore bit sequence, the first ignore bit sequence having all bits set to "1" and the second ignore bit sequence including at least one binary "0"; transmitting the PPDU, the PPDU including the second ignore bit sequence; A method comprising:

14. The method of claim 13 , wherein the U-SIG field includes at least a first U-SIG symbol and a second U-SIG symbol.

15. Operating on the first ignored bit sequence to obtain the second ignored bit sequence comprises: setting the value of the first ignore bit sequence to a sequence containing at least one "0" bit; or changing the value of the verification bit immediately following the first ignore bit sequence to "0" and modifying the value of the first ignore bit sequence to a preset value; or changing the position of the first ignore bit sequence in the U-SIG field and changing the value of the first ignore bit sequence; or 15. The method of claim 13 or 14, comprising replacing the first ignored bit sequence with a cyclic redundancy check (CRC).

16. A non-transitory machine-readable storage medium having processor-executable instructions stored thereon, 16. A non-transitory machine-readable storage medium, the processor-executable instructions, when executed by a processor of a communications device, causing the communications device to implement the method for reducing peak-to-average power ratio (PAPR) for transmitting physical layer protocol data units (PPDUs) of any one of claims 13 to 15.

17. 1. A computer program having computer readable instructions, comprising: A computer program, wherein the computer readable instructions are executable by a computerized device including processing hardware to perform the method of any one of claims 13 to 15.

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