Method and apparatus for transmitting and receiving signaling in a wireless local area network - Patents.com

Abstract

The present invention provides a method and apparatus for transmitting radio frames in a wireless local area network. [Solution] The method includes a step of generating a radio frame, wherein the radio frame includes a high-efficiency Wi-Fi signaling field 1 (HEW-SIG1) and a high-efficiency Wi-Fi signaling field 2 (HEW-SIG2) adjacent to HEW-SIG1, HEW-SIG1 includes a frame structure indication field indicating the frame structure of the radio frame, the frame structure of the radio frame includes an uplink structure or a downlink structure, and HEW-SIG2 further includes a duration field, wherein the duration field is used to indicate the remaining duration in occupying the channel by the scheduled transmission, and a step of transmitting the radio frame.

Description

[Technical field]

[0001] The present invention relates to the field of communications, and in particular to a method and apparatus for transmitting and receiving signaling in a wireless local area network. [Background technology]

[0002] Wireless Local Area Network (omitted) Wireless LAN (WLAN) is a network system that uses radio frequency technology to transmit data wirelessly. With the widespread application of intelligent terminals, the demand for network data traffic is increasing, and using WLAN to process traffic has become one of the most important ways to transmit information and data.

[0003] In order to develop WLAN technology, it is necessary to establish, popularize, and apply standards for WLAN technology. (omitted) In the International Standards Institute for Wireless LANs (IEEE), the 802.11 series has been the primary standard for WLANs, with several generations of mainstream standards including 802.11, 802.11b / g / a, 802.11n, and 802.11ac.

[0004] WLAN technology is based on computer network and wireless communication technology. In the computer network structure, the Logical Link Control (LLC) layer and the application layer on the LLC layer are connected to various physical layers. (omitted) Therefore, WLAN standards mainly focus on the physical layer and the media access control (MAC). (omitted) The term refers to the technical specifications and standards used in the Radio Access Control (MAC) layer and includes radio frequency ranges and air interface communication protocols.

[0005] The physical layer frame of the WLAN standard is based on the physical layer convergence procedure. (omitted) (PLCP) Protocol Data Unit (omitted) It is also called PLCP header and PLCP service data unit (PPDU). (omitted) The PLCP header mainly includes a training field and a signaling (SIGNAL, abbreviated as SIG) field.

[0006] Currently being researched and implemented, 802.11ax continues to advance WLAN technology. The 802.11ax standard includes orthogonal frequency division multiple access (OFA) technology. (omitted) Transmission efficiency has been improved using OFDMA (commonly referred to as OFDMA). However, there is no OFDMA-based design solution for common signaling in WLAN systems. Summary of the Invention [Means for solving the problem]

[0007] SUMMARY OF THE PRESENT EMBODIMENTS According to an embodiment of the present invention, a method and an apparatus for transmitting and receiving signaling in a WLAN are provided to solve the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0008] To achieve the above objectives, the embodiments of the present invention provide the following solutions:

[0009] A first embodiment of the present specification provides a method for transmitting signaling in a wireless local area network WLAN, the method including: a step of generating signaling by an access point AP, the signaling having a single-user SU / multi-user MU field, the SU / MU field being used to indicate whether a scheduled transmission is a single-user transmission or a multi-user transmission, and if the SU / MU field indicates that the scheduled transmission is a single-user transmission, the signaling does not have a HEW-SIG2 having resource indication information; and a step of transmitting the signaling by the AP.

[0010] A second embodiment of the present specification provides a method for receiving signaling in a wireless local area network WLAN, the method including: a step of receiving signaling by a station, the signaling having a single-user SU / multi-user MU field, the SU / MU field being used to indicate whether a scheduled transmission is a single-user transmission or a multi-user transmission, and if the SU / MU field indicates that the scheduled transmission is a single-user transmission, the signaling does not have a HEW-SIG2 having resource indication information; and a step of transmitting and receiving data by the station according to the received signaling.

[0011] A third embodiment of the present specification is an apparatus for transmitting signaling in a wireless local area network WLAN, the apparatus comprising: a first module configured to generate signaling, the signaling comprising a single-user SU / multi-user MU field, the SU / MU field being used to indicate whether a scheduled transmission is a single-user transmission or a multi-user transmission, and if the SU / MU field indicates that the scheduled transmission is a single-user transmission, the signaling does not comprise a HEW-SIG2 comprising resource indication information; and a second module configured to transmit the signaling.

[0012] A fourth embodiment of the present specification is an apparatus for receiving signaling in a wireless local area network WLAN, the apparatus comprising: a first module configured to receive signaling, the signaling comprising a single-user SU / multi-user MU field, the SU / MU field being used to indicate whether a scheduled transmission is a single-user transmission or a multi-user transmission, and if the SU / MU field indicates that the scheduled transmission is a single-user transmission, the signaling does not comprise a HEW-SIG2 comprising resource indication information; and a second module configured to transmit and receive data in accordance with the received signaling.

[0013] According to an embodiment of the present invention, a method and an apparatus for transmitting and receiving signaling in a WLAN are provided, the method includes: generating a signaling by an AP, the signaling comprising an AP ID field, a bandwidth BW field, a guard interval GI field, a cyclic redundancy check CRC field, and a tail Tail field, where the AP ID field is used to indicate the identity of the AP, the BW field is used to indicate a bandwidth required for data transmission following the signaling, the GI is used to indicate a cyclic prefix CP length required for data transmission following the signaling, the CRC field is used to protect a field before the CRC field in the signaling, and the Tail field is used to clear in an encoder and a decoder, where the CRC field and the Tail field are the last two fields in the signaling; and transmitting the signaling by the AP. The above solution provides an OFDMA-based design solution for common signaling in a WLAN system, thereby solving the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0014] In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings necessary for describing the embodiments or the prior art are briefly described below. In the following description, it is obvious that the accompanying drawings only show some embodiments of the present invention, and those skilled in the art can derive further drawings from these accompanying drawings without creative efforts. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a physical layer frame defined in the 802.11a standard. [Diagram 2] 1 is a schematic diagram of a signaling field in 802.11a. [Diagram 3]1 is a schematic diagram of a physical layer frame in a mixed format defined in the 802.11n standard. [Figure 4] 1 is a schematic diagram of a signaling field in 802.11a. [Diagram 5] 1 is a schematic diagram of a physical layer frame defined in the 802.11ac standard. [Figure 6] 1 is a schematic diagram of a signaling field in 802.11ac. [Figure 7] 1 is a schematic diagram of a network architecture of a WLAN according to an embodiment of the present invention; [Figure 8] 2 is a schematic flowchart of a method for transmitting signaling in a WLAN according to an embodiment of the present invention; [Figure 9] FIG. 2 is a schematic diagram illustrating the location of HEW-SIG1 in a data frame according to one embodiment of the present invention. [Figure 9a] 2 is a schematic diagram of a data frame according to an embodiment of the present invention; FIG. [Figure 10] 1 is a schematic configuration diagram 1 of a HEW-SIG1 according to an embodiment of the present invention. [Figure 11] FIG. 2 is a schematic configuration diagram 2 of the HEW-SIG1 according to one embodiment of the present invention. [Figure 12] FIG. 3 is a schematic configuration diagram of a HEW-SIG1 according to an embodiment of the present invention. [Figure 13] FIG. 4 is a schematic configuration diagram of a HEW-SIG1 according to an embodiment of the present invention. [Figure 14] FIG. 5 is a schematic configuration diagram of a HEW-SIG1 according to an embodiment of the present invention. [Figure 15] FIG. 2 is a schematic diagram of an uplink frame structure format according to one embodiment of the present invention. [Figure 16] FIG. 2 is a schematic diagram of a downlink frame structure format according to one embodiment of the present invention; [Figure 17] FIG. 2 is a schematic diagram of a frame structure format cascaded downlink and uplink according to an embodiment of the present invention; [Figure 18] 2 is a schematic flowchart of a method for receiving signaling in a WLAN according to an embodiment of the present invention; [Figure 19A] 1 is a schematic flow chart illustrating the analysis of signaling HEW-SIG1 according to one embodiment of the present invention. [Figure 19B] 1 is a schematic flow chart illustrating the analysis of signaling HEW-SIG1 according to one embodiment of the present invention. [Figure 20] FIG. 2 is a schematic diagram illustrating the location of a transition point according to one embodiment of the present invention. [Figure 21] FIG. 2 is a schematic diagram illustrating a time domain location of uplink transmission resources according to an embodiment of the present invention; [Figure 22] 1 is a schematic configuration diagram 1 of an AP according to an embodiment of the present invention. [Figure 23] 2 is a schematic configuration diagram 2 of an AP according to one embodiment of the present invention. [Figure 24] 1 is a schematic configuration diagram of an STA according to one embodiment of the present invention. [Diagram 25] 2 is a schematic configuration diagram 2 of a STA according to one embodiment of the present invention. [Figure 26] 3 is a schematic configuration diagram of an AP according to an embodiment of the present invention. [Figure 27] FIG. 4 is a schematic configuration diagram of an AP according to an embodiment of the present invention. [Figure 28] 3 is a schematic configuration diagram of an STA according to one embodiment of the present invention. [Figure 29] FIG. 4 is a schematic configuration diagram of an STA according to one embodiment of the present invention. [Diagram 30] 2 is a schematic flowchart of a method for transmitting signaling in a WLAN according to an embodiment of the present invention; [Diagram 31] 6 is a schematic diagram of a HEW-SIG1 according to an embodiment of the present invention. [Diagram 32] 2 is a schematic flowchart of a method for transmitting signaling in a WLAN according to an embodiment of the present invention; [Figure 33A]1 is a schematic flow chart illustrating the analysis of signaling HEW-SIG1 according to one embodiment of the present invention. [Figure 33B] 1 is a schematic flow chart illustrating the analysis of signaling HEW-SIG1 according to one embodiment of the present invention. [Diagram 34] 2 is a schematic flowchart of a method for transmitting signaling in a WLAN according to an embodiment of the present invention; [Diagram 35] FIG. 7 is a schematic diagram of a HEW-SIG1 according to an embodiment of the present invention. [Diagram 36] FIG. 8 is a schematic diagram of a HEW-SIG1 according to an embodiment of the present invention. [Figure 37] 2 is a schematic flowchart of a method for transmitting signaling in a WLAN according to an embodiment of the present invention; [Figure 38] FIG. 5 is a schematic configuration diagram of a STA according to one embodiment of the present invention. [Figure 39] FIG. 5 is a schematic configuration diagram of an AP according to an embodiment of the present invention. [Figure 40a] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40b] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40c] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40d] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40e] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Fig. 40f] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40g] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40h]A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40i] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40j] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40k] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Fig.40l] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Figure 40m] A schematic configuration diagram of HE-SIG-A or HE-SIG-B in one embodiment of the present invention. [Diagram 41] FIG. 4 is a schematic diagram illustrating a receiving side process according to an embodiment of the present invention. [Diagram 42] FIG. 2 is another schematic diagram illustrating a receiving side processing procedure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The physical layer frame structures of the three representative generations of WLAN standards, 802.11a, 802.11n, and 802.11ac, are briefly described below.

[0017] Figure 1 shows the schematic configuration of the physical layer frame defined in the 802.11a standard. The PLCP header is a short training field. (omitted) (called STF) and the Long Training Field (omitted) The PLCP header contains a preamble (called LTF) and a SIG field. Ru Department The STF is used for data packet detection and automatic gain control. (omitted)The LTF is located after the STF and is used to perform channel estimation, more accurate frequency offset estimation, and initial time synchronization. The SIG field is located after the LTF and is used to identify the rate and length information of the data packet, and is used to perform orthogonal frequency division multiplexing (OFDM) signaling. (omitted) Contains OFDM (orthogonal frequency division multiplexing) symbols.

[0018] The SIG field of the 802.11a standard is 4 μs A single element of (3.2 μs OFDM elements and 0.8 μs Cyclic prefix of (omitted) The SIG field waveform contains 64 subcarriers, with the subcarriers in the SIG field ranging in location from -32, -31, ..., -1, 0, 1, ..., 31. The signal carrying subcarriers are located at -21, -7, 7, 21, pilot subcarriers are located at -26, -25, ..., -2, -1, 1, 2, ..., 25, 26, and the remaining 48 subcarriers carry the coded SIG bits. The remaining subcarriers located at -32, ..., -27, 27, ..., 31 are guard subcarriers, and 0 is the DC subcarrier. The SIG field is implemented using binary phase shift keying (BPS). (omitted) Since the SIG is transmitted by half-rate binary convolutional coding (abbreviated as BPSK), the SIG contains 24 information bits, as shown in Figure 2. Bits 0 to 3 are rate bits and are used to indicate the modulation and coding scheme (abbreviated as MCS) used for the data portion transmission, bit 4 is a reserved bit, and bits 5 to 16 are length bits and are used to indicate the length or amount of data. Bit 5 is the least significant bit. (omitted) 16 is the most significant bit (LSB) (omitted)Bit 17 is the check bit and is used to perform an even parity check on the first 17 bits. The last 6 bits are set to 0 to clear the encoder and decoder, since the SIG and the following data are binary convolutionally encoded separately.

[0019] 3 is a schematic diagram of a physical layer frame in a mixed format defined in the 802.11n standard. The PLCP Header of the mixed format in 802.11n includes two parts, namely, a legacy PLCP Header in 802.11n and a PLCP Header. (omitted) The term L mainly refers to the PLCP Header of 802.11a. Here, high throughput (omitted) The term HT (High-Threshold Multiplier) mainly refers to the PLCP Header section of 802.11n. To ensure backward compatibility, the L-Preamble section's L-STF is the same as the STF field of the 802.11a preamble, the L-LTF field is the same as the LTF field of the 802.11a preamble, and the L-SIG field is the same as the SIG field of the 802.11a preamble. The HT Preamble section includes the HT-SIG field, the HT-STF, and the HT-LTF. The HT-SIG field includes two OFDM symbols, HT-SIG1 and HT-SIG2, which contain new signaling information of the 802.11n standard and are used to perform auto-detection between 802.11n data packets and legacy 802.11a data packets. The HT-STF is used to reset the automatic gain. HT-LTF contains one or more OFDM symbols and uses it to achieve multiple-input multiple-output (omitted) In the HT-LTF, a MIMO (commonly referred to as "multiple input / output") channel estimation is performed. The HT data field is located after the HT-LTF.

[0020] The schematic diagram of two symbols, HT-SIG1 and HT-SIG2, is shown in Figure 4. The number of subcarriers and the modulation and coding mode in HT-SIG1 and HT-SIG2 are the same as those in the SIG of 802.11a, so each symbol contains 24 information bits, and the last 6 bits are set to 0 to clear the encoder and decoder. In HT-SIG1, the first 7 bits represent the MCS indication, and one MCS is selected from 0 to 76 to transmit the following data part. Bit 7 is used to indicate whether the data is transmitted in a 20 MHz bandwidth or a 40 MHz bandwidth. This information can prevent a 20 MHz bandwidth receiver from receiving a signal transmitted in a 40 MHz bandwidth, thereby reducing power consumption. Bits 8 to 23 are used to indicate the length of the data, which ranges from 0 to 65535 bytes. In HT-SIG2, the smoothing field (bit 0), the non-detection field (bit 1), and the extended spatial stream field (bits 8 to 9) are used to indicate information about beamforming transmission, because 802.11n supports beamforming transmission. Bit 2 is a reserved bit. Bit 3 is an aggregation bit, which is used to aggregate the data portion into a single MAC protocol data unit. (M PDU) or an aggregation of MPDUs (omitted) Bits 4 to 5 indicate whether the data is a space-time block coded data unit (also called A-MPDU). (omitted) The sigma stands for STBC (Stage-Temporal Code Coding), where 0 indicates that no STBC coding is performed, 3 is a reserved value, and 1 and 2 are used to indicate the difference between the number of different space-time streams and the number of different spatial streams obtained when different MCS are used. (omitted) The coding mode of the data is binary convolutional coding using the coded bits (called FEC) (omitted) BCC (Binary Code Check) or low density parity check (omitted) Bit 7 is used to indicate whether the CP of the data transmission part is a short CP (0.4 μs ) or long CP(0.8μs Bits 10 to 17 are CRC guard bits, and are used to protect bits 0 to 23 of HT-SIG1 and bits 0 to 9 of HT-SIG2.

[0021] Figure 5 is a schematic diagram of a physical layer frame defined in the 802.11ac standard. The preamble (or PLCP Header) of 802.11ac includes two parts, namely, a legacy preamble and a VHT preamble. Here, L mainly refers to the PLCP Header part of 802.11a. Here, ultra-high throughput (omitted) The term VHT (VHT Preamble) refers to the PLCP Header section of 802.11ac. To ensure backward compatibility, the L-Preamble section in the 802.11ac preamble is the same as the L-Preamble section in the 802.11n preamble. The VHT Preamble section includes a VHT-SIGA field, a VHT-STF, a VHT-LTF, and a VHT-SIGB field. The VHT-SIGA field includes two OFDM symbols, VHT-SIGA1 and VHT-SIGA2, and contains new signaling information of the 802.11ac standard, and is used to perform auto-detection between 802.11ac data packets, legacy 802.11a data packets, and 802.11n. The structure and function of VHT-STF and VHT-LTF are similar to those of HT-STF and HT-LTF. The VHT-SIGB field is a new field in the 802.11ac preamble that can be used to (omitted) MIMO (Multi-Input Multiple Output) function is supported.

[0022] The schematic structure of two symbols, VHT-SIGA1 and VHT-SIGA2, is shown in Figure 6. The number of subcarriers and modulation and coding modes of HT-SIG-A1 and VHE-SIG-A2 are the same as those of 802.11a SIGs, so each symbol contains 24 information bits, and the tail 6 bits are set to 0 to clear the encoder and decoder. In VHT-SIG-A1, bits 0 to 1 are used to indicate the transmission bandwidth after VHT-SIG-A, and 2 bits are used to indicate the bandwidth of 20 MHz, 40 MHz, 80 MHz, and 160 MHz. Bit 2 is a reserved bit, and bit 3 is used to indicate whether STBC is used. Bits 4 to 9 are used to indicate the group during MU-MIMO transmission. In single user (signal user, abbreviated as SU) transmission, the access point (omitted) Group identifier of data packets sent to the AP (omitted) The group ID of the data packet sent by the AP is 0, and the group ID of the data packet sent by the AP is 1. The remaining bits 4 to 9 indicate the group of the MU. As for bits 10 to 21, bits 10 to 12 are used to indicate the number of space time streams (abbreviated as NSTS) during SU transmission, and bits 13 to 21 are used to indicate the number of space time streams (abbreviated as NSTS) during SU transmission. (omitted) Partial Association Identifier in the STA (Stage Identifier) (omitted) The STA's AID (also called AID) is indicated, and the receiver determines whether to receive the information transmitted by the STA. During MU transmission, bits 10 to 12, bits 13 to 15, bits 16 to 18, and bits 19 to 21 are used separately to indicate the NSTS carried by the data of each user in the group. Bit 22 is used to indicate whether a non-AP STA has a transmission opportunity. (omitted) Bit 23 is a reserved bit. In VHT-SIG-A2, bit 0 is used to indicate whether the CP in the data transmission part after VHT-SIG-A is a short CP (0.4 μs ) or long CP(0.8 μs) is used. Bit 1 is used to indicate whether during short CP transmission, the symbol length exceeds a certain value. Bit 2 is used to indicate the coding mode. During SU transmission, 0 indicates BCC coding and 1 indicates LDPC coding. During MU transmission, if MU[0]NSTS, indicated by bits 10 to 12 of VHT-SIG-A1, is a non-zero value, bit 2 being 0 indicates BCC coding, bit 2 being 1 indicates LDPC coding, or if MU[0]NSTS is 0, it is a reserved bit. Bit 3 is used to indicate whether an additional OFDM symbol needs to be added when LDPC coding is used. Regarding bits 4 to 7, during SU transmission, bits 4 to 7 indicate the MCS of the data transmission, and during MU transmission, the multi-user scenario of bits 4, 5, and 6 is the same as the multi-user scenario of bit 2. Bit 8 is used to indicate whether beamforming is used during SU transmission. Bit 9 is a reserved bit. Bits 10 through 17 match bits 10 through 17 of HT-SIG2 in 802.11n, and are used to protect bits 0 through 23 of VHT-SIG-A1 and bits 0 through 9 of VHT-SIG-A2.

[0023] The following describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Certainly It is clear that the described embodiments are only a part of, but not all of, the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are included in the protection scope of the present invention.

[0024] In order to facilitate clear description of the technical solutions in the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish identical items and similar items that provide essentially the same function or purpose. Those skilled in the art can understand that terms such as "first" and "second" do not limit the number and implementation order.

[0025] EMBODIMENT 1 7 is a schematic diagram of a network architecture of a WLAN applied in this embodiment of the present invention, and the network architecture of the WLAN 10 includes an AP 20 and a plurality of STAs 30. The WLAN 10 includes an uplink between the AP 20 and the plurality of STAs 30. (omitted) (UL) or downlink (D L) MU MIMO communication is supported, and the WLAN 10 supports UL SU communication or DL ​​SU communication between the AP 20 and each of the multiple STAs 30.

[0026] The AP 20 includes a host processor 21 coupled to a network interface 22. The network interface 22 includes a MAC 23 and a PHY 24. The PHY 24 includes a number of transceivers (transmit / receive, abbreviated as TX / RX) 25, and the transceivers 25 are coupled to a number of antennas 26. In this embodiment of the present invention, the MAC 23 and the PHY 24 are configured to perform operations according to a first communication protocol (e.g., the IEEE 802.11ax standard, which is currently in the standardization process). The MAC 23 and the PHY 24 may, of course, be configured to perform operations according to a second communication protocol (e.g., the IEEE 802.11n standard, the IEEE 802.11a standard, and the IEEE 802.11ac standard, etc.). In this regard, the present embodiment of the present invention is not particularly limited. In this specification, the first communication protocol is referred to as a High Efficiency Wireless Local Area Network (HEW) protocol, and in this specification, the second communication protocol is referred to as a legacy protocol.

[0027] The STAs 30 include a host processor 31 coupled to a network interface 32, which in turn includes a MAC 33 and a PHY 34. The PHY 34 includes a number of transceivers 35, which in turn are coupled to a number of antennas 36. At least one of the STAs 30 is configured to perform operations according to the HEW protocol.

[0028] The WLAN 10 may, of course, further include an L-STA 40, where the L-STA 40 is configured to perform operations according to a legacy protocol instead of the HEW protocol, although this is not particularly limited in this embodiment of the present invention.

[0029] Those skilled in the art will easily understand that Fig. 7 merely provides a schematic diagram of a network architecture that can be implemented in a WLAN for illustrative purposes. Of course, there may be other possible architectures, and the present embodiment of the present invention is not particularly limited in this regard.

[0030] Those skilled in the art will easily understand that both the STA side and the AP side may include multiple transceivers and antennas, and Fig. 7 merely illustrates three separate transceivers and three separate antennas on the STA side and the AP side, and the number of transceivers and antennas is not limited thereto. In this regard, the present embodiment of the present invention is not particularly limited.

[0031] Those skilled in the art will easily understand that the WLAN 10 may include multiple STAs 30 and multiple L-STAs 40, and that Fig. 7 merely illustrates four STAs 30 and one L-STA 40, and the number of STAs 30 and L-STAs 40 is not limited thereto. In this regard, the present embodiment of the present invention is not particularly limited.

[0032] FIG. 8 is a method for transmitting signaling in a WLAN according to an embodiment of the present invention, which includes the following steps.

[0033] The S801.AP generates signaling, which includes an AP ID field, a Bandwidth (BW) field, a Guard Interval (GI) field, a CRC field, and a trailing t and a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the CP length required for data transmission following the signaling, the CRC field is used to protect the fields before the CRC field in the signaling, and the Tail field is used for clearing in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0034] S802. The AP transmits signaling.

[0035] In step S801 of this embodiment of the present invention, the AP ID field may preferably be the first field of signaling. Therefore, after receiving the data packet sent by the AP, the receiving STA side can first analyze the AP ID field to determine whether the received data packet is the data packet sent by the AP associated with the STA. If the received data packet is the data packet sent by the AP associated with the STA, the analysis of the data packet continues. If the received data packet is not the data packet sent by the AP associated with the STA, the analysis of the data packet is stopped, thereby saving system resources.

[0036] Illustratively, an example where the signaling generated by the AP is called HEW-SIG1 is used for explanation. The position of HEW-SIG1 in the data frame is shown in Figure 9, where it is assumed that HEW-SIG1 is located after the L-Preamble. Therefore, the decoding of HEW-SIG1 is based on the channel estimation of the L-Preamble, and the transmission parameters of SIG / SIGA in 802.11a, 802.11n, and 802.11ac are still inherited. In a bandwidth of 20 MHz, 52 subcarriers in 64 subcarriers are used as effective subcarriers, including 4 pilot subcarriers. They are consistent with the transmission parameters of the L-Preamble. HEW-SIG1 is transmitted using MCS0, which is BPSK / Quadrature Binary Phase Shift Keying. (omitted) The OFDM symbol is modulated using quadrature BPSK (quadrature-based hop-shift keying) modulation and half-rate BCC coding, so that one OFDM symbol carries 24 bits of information.

[0037] As shown in Figure 10, excluding the 8-bit CRC field and the 6-bit Tail field used to clear the codec, if HEW-SIG1 has only one OFDM symbol, only 10 bits are available for the AP ID field, BW field, and GI field. The BW field and GI field each require 2 bits, and the AP ID field requires 6 bits, which means 64 different APs can be assigned. 6 This can be used to distinguish between different IDs.

[0038] The specific contents of the fields carried by the OFDM symbols of HEW-SIG1 are shown in Table 1. The 6-bit AP ID field is used to identify 64 different APs, i.e., 2 6A 2-bit BW field is used to indicate the bandwidth using the scenarios 20 MHz, 40 MHz, 80 MHz, and 160 MHz, a 2-bit GI field is used to indicate four CP lengths, where 0.8 and 1.6 are fixed values ​​and the remaining two can be 0.4, 2.4, and 3.2, etc., and the CRC and Tail fields are consistent with the SIG / SIGA fields of 802.11n and 802.11ac.

[0039] [Table 1]

[0040] Those skilled in the art will readily appreciate that Fig. 10 merely provides an exemplary schematic diagram of a possible implementation in the HEW-SIG1. The fields in the HEW-SIG1 may of course also be arranged in other configurations, and are not particularly limited in this regard in the present embodiment of the present invention.

[0041] Also, since the information bits to be transmitted are limited, the CRC bits may be compressed, for example, a CRC check is performed using 6 bits, and in this case, 12 bits can be used to carry the valid information. As shown in FIG. 11, a 2-bit BW, a 2-bit GI, and a 7-bit AP ID may be carried, and another field that may exist in the signaling may be further carried, or the remaining 1 bit may be reserved. If the check is performed using 4 bits, the valid information may of course be carried using 14 bits. Except for the 2-bit BW, 2-bit GI, and 7-bit AP ID that are carried, 3-bit may be further used to carry additional information, or it may be used as a reserved field. In this regard, there is no particular limitation in this embodiment of the present invention.

[0042] In addition, in the method for transmitting signaling in a WLAN according to an embodiment of the present invention, the signaling generated in step S801 further comprises at least one of the following fields, namely, a next signaling MCS field, a next signaling length field, a frame structure indication field, a SU / MU field, a transition time field, a duration field, a forward error correction FEC coding field, a STA number field, or a station identifier (STA the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, the SU / MU field is used to indicate whether this scheduled transmission is a SU transmission or a MU transmission, the transition time field is used to indicate the transition point from downlink to uplink, the duration field is used to indicate the remaining duration when the channel is occupied by this scheduled transmission, the FEC coding field is used to indicate the data coding mode in this scheduled transmission, the STA number field is used to indicate the number of STAs in this scheduled transmission, and the STAID length field is used to indicate the length of the STAID of the STA in this scheduled transmission.

[0043] Specifically, in addition to the AP ID field, the BW field, the GI field, the CRC field, and the Tail field, there may be several other fields in the HEW-SIG1.

[0044] For illustrative purposes, an example in which the next signaling of HEW-SIG1 is HEW-SIG2 is used for explanation. Similarly, the position of HEW-SIG1 in the data frame is shown in FIG. 9, and one OFDM symbol carries 24-bit information, and HEW-SIG1 is divided into two 4 μsIt is assumed that the HEW-SIG1 contains OFDM symbols. As shown in Figure 12, the HEW-SIG1 contains an AP ID field, a BW field, a GI field, a HEW-SIG2 MCS field, a HEW-SIG2 length field, a frame structure indication field, a transition time field, a SU / MU field, a CRC field, and a Tail field. Figure 12 shows the order of the fields and the number of bits in each field.

[0045] The specific contents of the fields carried by the first and second OFDM symbols of HEW-SIG1 are shown in Tables 2 and 3, respectively. A 7-bit AP ID field is used to identify 128 different APs, i.e., 2 7 a 2-bit BW field is used to indicate the bandwidth using the scenarios of 20 MHz, 40 MHz, 80 MHz, and 160 MHz; a 2-bit GI field is used to indicate four CP lengths, where 0.8 and 1.6 are fixed values ​​and the remaining two can be 0.4, 2.4, and 3.2; the HEW-SIG2 MCS field and the HEW-SIG2 length field indicate the transmission MCS and length of the HEW-SIG2; a frame structure indication field is used to indicate the uplink / downlink transmission method of the frame in this scheduling transmission; a transition time field is used to indicate the transition time from downlink to uplink; a SU / MU field is used to indicate whether this scheduling transmission is a SU transmission or a MU transmission; and the CRC and Tail fields are consistent with the SIG / SIGA fields of 802.11n and 802.11ac.

[0046] [Table 2]

[0047] [Table 3]

[0048] Those skilled in the art will readily appreciate that Fig. 12 merely provides an exemplary schematic diagram of a possible implementation of HEW-SIG1. Of course, HEW-SIG1 may further include other fields, and the fields within HEW-SIG1 may further be arranged in other forms. In this regard, the present embodiment of the present invention is not particularly limited.

[0049] For example, a schematic configuration diagram of HEW-SIG1 may be shown in Fig. 13. Compared with HEW-SIG1 shown in Fig. 12, a duration field and an FEC encoding field are added to HEW-SIG1 shown in Fig. 13, and a frame structure indication field and a transition time field are deleted.

[0050] Alternatively, for example, a schematic diagram of the HEW-SIG1 can be shown in FIG. 14, where the HEW-SIG1 has three 4 μs In this regard, the present embodiment of the present invention is not particularly limited.

[0051] It should be noted that the reserved field of HEW-SIG1 in the schematic diagram of the HEW-SIG1 above can be used to indicate other signaling, although this is not particularly limited in this embodiment of the present invention.

[0052] In this embodiment of the present invention, a partial field of the HEW-SIG1 can be reused. For example, in the schematic configuration diagram of the HEW-SIG1 shown in FIG. 12, when the frame structure indication field indicates whether the frame structure of this scheduling transmission is an uplink structure or a downlink structure, the transition time field is unnecessary. In this case, the 6 bits of the transition time field are, for example, an acknowledgment character. (omitted) Alternatively, the MCS may be reused as another signaling bit for information such as MCS for transmitting a ACK (referred to as ACK). In this regard, the present embodiment of the present invention is not particularly limited.

[0053] In addition, the STA field may be used to indicate whether the scheduled transmission is a SU transmission or a MU transmission. For example, if the value of the STA field is 1, it may indicate that the scheduled transmission is a SU transmission, or if the value of the STA field is not 1, it may indicate that the scheduled transmission is a MU transmission.

[0054] In addition, in the method for sending signaling in a WLAN according to this embodiment of the present invention, when the frame structure indication field indicates that the frame structure of this scheduling transmission is an uplink structure, after the AP sends the signaling (step S802), the method includes: receiving, by an AP, an uplink data packet transmitted by a STA; sending an acknowledgement message by the AP to the STA, the acknowledgement message being used to indicate that the AP has received the uplink data packet; It may further include.

[0055] Specifically, in this embodiment of the present invention, when there is only an uplink data packet, the frame structure format may be shown in FIG. 15. First, the AP sends a channel reservation packet to enter the scheduling transmission phase. (omitted)The AP then sends an L-Preamble and an HEW Preamble, where the HEW Preamble includes HEW-SIG1, HEW-STF, HEW-LTF, and HEW-SIG2. The HEW-SIG2 includes a resource allocation instruction in the uplink transmission stage. The STA performs uplink transmission on the indicated resource in the next uplink transmission timeslot according to the resource allocation instruction of the HEW-SIG2. If there is still only uplink data in the next uplink transmission timeslot, after the first uplink transmission timeslot ends, the AP sends an ACK for the uplink data just received, and indicates the resource allocation status of the next uplink timeslot. When the uplink data transmission ends, the AP only sends an ACK for the uplink data just received.

[0056] Media Access Protocol in Figure 15 (omitted) A Resource Allocation Instruction (MAP) is a resource allocation instruction.

[0057] In the method for sending signaling in a WLAN according to this embodiment of the present invention, when the frame structure indication field indicates that the frame structure of this scheduling transmission is a downlink structure, after the AP sends the signaling (step S802), the method includes: transmitting, by the AP, a downlink data packet for a STA; receiving, by the AP, an acknowledgement message sent by the STA, where the acknowledgement message is used to indicate that the STA will receive a downlink data packet; may further be included as necessary.

[0058] Specifically, in this embodiment of the present invention, when there is only a downlink data packet, the frame structure format may be shown in Figure 16. First, the AP sends a CRP to enter the scheduling transmission phase. Then, the AP sends downlink data, where the beginning part of the downlink data includes an L-Preamble and a HEW Preamble. The HEW Preamble includes a HEW-SIG1, a HEW-STF, a HEW-LTF, and a HEW-SIG2. The downlink data is sent immediately after the HEW Preamble. The HEW-SIG2 includes a resource allocation instruction in the downlink transmission phase and / or a resource instruction regarding a response to an ACK in the uplink. The STA receives the downlink data on the corresponding resource according to the resource allocation instruction of the HEW-SIG2. After the downlink data transmission is finished, the STA sends an ACK of the downlink data received just before.

[0059] In the method for sending signaling in a WLAN according to this embodiment of the present invention, when the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, after the AP sends the signaling (step S802), the method includes: transmitting, by the AP, a downlink data packet for a STA; receiving, by the AP, an uplink data packet transmitted by the STA and a first acknowledgement message, the first acknowledgement message being used to indicate that the STA receives a downlink data packet; sending a second acknowledgement message by the AP to the STA, the second acknowledgement message being used to indicate that the AP will receive the uplink data packet; may further be included as necessary.

[0060] Specifically, in this embodiment of the present invention, when both downlink data packets and uplink data packets exist, the frame structure format may be shown in FIG. 17. First, the AP sends a CRP to enter the scheduling transmission stage. Then, the AP sends an L-Preamble and an HEW Preamble. The HEW Preamble includes HEW-SIG1, HEW-STF, HEW-LTF, and HEW-SIG2. The HEW-SIG2 includes a resource location for receiving data in a downlink transmission timeslot at the STA side and transmitting data in an uplink transmission timeslot at the STA side. After one downlink transmission and uplink transmission are finished, if there is still downlink data and uplink data, the downlink transmission and uplink transmission are continued in a manner starting from the downlink data after the uplink data is finished. In the uplink transmission period, the transmission of an ACK reply to the downlink data is included, and in the downlink transmission period, the transmission of an ACK for the uplink data is included. As shown in the last part of FIG. 17, if the transmission finally ends up in an uplink timeslot, it must be performed after the AP's ACK reply to the uplink transmission.

[0061] If the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, after the AP sends signaling (step S802), of course, the method includes: receiving, by an AP, an uplink data packet transmitted by a STA; sending, by the AP, a downlink data packet and a second acknowledgement message to the STA, where the second acknowledgement message is used to indicate that the AP receives the uplink data packet; receiving, by the AP, a first acknowledgement message transmitted by the STA, the first acknowledgement message being used to indicate that the STA will receive a downlink data packet; It may further include.

[0062] This embodiment of the present invention does not impose any particular limitations thereon.

[0063] Also, if the transition time field from downlink to uplink is T, the value M of the transition time field is calculated by the following formula (1): M = (T - end time of next signaling) / time domain length of each resource unit during this scheduling, It is as follows.

[0064] Specifically, for 20MHz data transmission and 256-point Fast Fourier Transform (FFT), the symbol length is 12.8 μs This gives us 0.8. μs However, for 20MHz data transmission and 256-point FFT, the shortest OFDM symbol length is 13.6 μs The maximum length that can be specified in the SIG of the L-Preamble is 5484. μs 20 μs The L-Preamble length is subtracted, and the remaining 5464 μs The preamble and data of the HEW part are transmitted using M = 5464 / 13.6 / n. Assuming that the time domain of the resource unit in the scheduling phase contains n OFDM symbols, the maximum number of possible downlink to uplink switch points is M = 5464 / 13.6 / n. Assuming that n = 8, the maximum number of downlink to uplink switch points is M = 5464 / 13.6 / 8 ≈ 50. If the transition time field occupies 6 bits, 2 6In this case, n=64 switch points are indicated, and all the switch points from downlink to uplink that exist when n=8 can be indicated. If the time domain of the resource unit contains different numbers of OFDM symbols, the number of bits required by the transition time field will of course be different. In this regard, this embodiment of the present invention is not particularly limited.

[0065] According to the present embodiment of the present invention, the method for transmitting signaling in a WLAN includes: generating a signaling by an AP, the signaling comprising an AP ID field, a BW field, a GI field, a CRC field, and a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the GI is used to indicate the CP length required for the data transmission following the signaling, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and the decoder, where the CRC field and the Tail field are the last two fields in the signaling; and transmitting the signaling by the AP. The above solution provides an OFDMA-based design solution for common signaling in a WLAN system, thereby solving the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0066] FIG. 18 is a method for receiving signaling in a WLAN according to one embodiment of the present invention, which includes the following steps.

[0067] S1801.STA receives signaling transmitted by an access point AP, the signaling having an AP ID field, a BW field, a GI field, a CRC field, and a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the CP length required for data transmission following the signaling, the CRC field is used to protect fields before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0068] S1802.STA parses the AP ID field, the BW field, and the GI field to obtain the ID of the AP, and the bandwidth and CP length required for data transmission following the signaling, respectively.

[0069] If the ID of the AP does not match the AP ID associated with the STA, parsing stops for fields after the AP ID field.

[0070] Specifically, for a schematic configuration diagram of the signaling received by the STA in step S1801 in this embodiment of the present invention, reference can be made to FIG. 10, and detailed description thereof will not be repeated in this embodiment of the present invention.

[0071] In step S1801 of this embodiment of the present invention, the AP ID field may preferably be the first field of the signaling. Therefore, after receiving a data packet sent by an AP, the STA can first analyze the AP ID field to determine whether the received data packet is a data packet sent by an AP associated with the STA. If the received data packet is a data packet sent by an AP associated with the STA, the analysis of the data packet continues. If the received data packet is not a data packet sent by an AP associated with the STA, the analysis of the data packet is stopped, thereby saving system resources.

[0072] Also, in the method of receiving signaling in a WLAN according to this embodiment of the present invention, the signaling may further comprise at least one of the following fields: A transmission MCS field of the next signaling, a next signaling length field, a frame structure indication field, a SU / MU field, a transition time field, a duration field, an FEC coding field, a number of STAs field, or a STA ID length field in the signaling, in which the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, and the SU / MU field is used to indicate whether this scheduled transmission is a SU transmission or a MU transmission. The transition time field is used to indicate the transition time from downlink to uplink, the duration field is used to indicate the remaining duration of occupying the channel by this scheduling transmission, the FEC coding field is used to indicate the data coding mode in this scheduling transmission, the STA number field is used to indicate the number of STAs in this scheduling transmission, and the STAID length field is used to indicate the length of the STAID of the STA in this scheduling transmission, where the frame structure of this scheduling transmission includes an uplink structure, a downlink structure, or a cascaded downlink and uplink structure.

[0073] According to this embodiment of the present invention, a method for receiving signaling in a WLAN includes the steps of: Parsing at least one of the following fields by the STA to obtain at least one of the following information: The method may further include steps including the MCS of the next signaling, the length of the next signaling, the frame structure of the scheduling transmission, whether the scheduling transmission is a SU transmission or a MU transmission, the transition point from downlink to uplink, the remaining duration for occupying the channel by the scheduling transmission, the data coding mode in the scheduling transmission, the number of STAs in the scheduling transmission, or the length of the STA ID of the STA in the scheduling transmission.

[0074] Specifically, in this embodiment of the present invention, reference can be made to Figures 12 to 14 for schematic configuration diagrams of the signaling received by the STA, so detailed descriptions will not be repeated in this embodiment of the present invention.

[0075] Also, a method for receiving signaling in a WLAN according to this embodiment of the present invention includes: reading, by a STA, resource indication information in an upcoming signaling; determining, by the STA, a resource location of the STA according to the resource indication information; transmitting, by a STA, an uplink data packet and / or a downlink data packet at a resource location; It may further include.

[0076] Illustratively, the AP ID field is the first field of the signaling, and the schematic configuration diagram of the signaling received by the STA is specifically shown in Figure 12, a schematic flow chart is shown here to represent the analysis of the signaling HEW-SIG1 by the STA after receiving the data packet. As shown in Figure 19A and Figure 19B, the procedure includes the following steps:

[0077] S1901.STA parses the AP ID field to obtain the ID of the AP.

[0078] S1902. The STA determines whether the received data packet is a data packet sent by the AP associated with the STA according to the ID of the AP.

[0079] If the received data packet is a data packet transmitted by an AP associated with the STA, step S1903 is executed, otherwise, if the received data packet is not a data packet transmitted by an AP associated with the STA, the procedure ends.

[0080] S1903.STA analyzes the BW field, GI field, HEW-SIG2 transmission MCS field, and HEW-SIG2 length field to obtain the bandwidth and CP length required for subsequent data transmission of HEW-SIG1, the transmission MCS of HEW-SIG2, and the length of HEW-SIG2, respectively.

[0081] S1904.STA parses the frame structure indication field to obtain the frame structure of this scheduling transmission.

[0082] S1905.STA determines whether the frame structure of this scheduling transmission is a cascaded downlink and uplink structure.

[0083] If the frame structure of this scheduling transmission is the structure cascaded downlink and uplink, step S1906 is executed, or if the frame structure of this scheduling transmission is not the structure cascaded downlink and uplink, step S1907 is executed.

[0084] S1906.STA analyzes the transition time field to obtain the transition time point from downlink to uplink.

[0085] S1907.STA analyzes the SU / MU field to determine whether this scheduled transmission is a SU transmission or a MU transmission.

[0086] If the scheduled transmission is a SU transmission, step S1908 is executed; otherwise, if the scheduled transmission is a MU transmission, step S1909 is executed.

[0087] S1908. If the scheduled transmission is a SU transmission, data is transmitted and received according to the carrier allocation format for the SU transmission.

[0088] S1909. If this scheduled transmission is a MU transmission, the STA reads the resource indication information of the HEW-SIG2.

[0089] S1910.STA specifies the resource location where the STA transmits and receives data according to the resource instruction information of HEW-SIG2, and transmits and receives data at the corresponding resource location.

[0090] At this point the procedure for analyzing the signaling HEW-SIG1 is finished.

[0091] In addition, when SU ​​transmission is performed, the subsequent transmission resources are used by only one user, so the resource indication information of HEW-SIG2 is not required. However, when MU transmission is performed, the location where the STA receives (downlink) data and transmits (uplink) data needs to be indicated by HEW-SIG2, and when MU transmission is performed, pilots are set as reliably as possible so that they exist in both the receiving unit and the transmitting unit of each STA in order to ensure the transmission and reception quality. Therefore, the allocation structure of subcarriers is different between SU ​​transmission and MU transmission, and more pilot design is required for MU transmission compared with SU transmission. In conclusion, a SU / MU field can be added to indicate whether this scheduled transmission is SU transmission or MU transmission.

[0092] In addition, when the signaling includes a transition time field, the STA may analyze the transition time field to obtain a transition time point from the downlink to the uplink. A step of determining, by the STA, a transition time from downlink to uplink according to the value of the transition time field, a time domain length of the resource unit, and an end time of the signaling by referring to a preset formula, the preset formula being: Equation (2): Transition time point = value of transition time field × time domain length of resource unit + end time of next signaling; The steps are In particular:

[0093] For example, if the value of the transition time field is 010100, which is converted to a decimal number as 20, and the time domain of each resource unit in this scheduling includes 8 OFDM symbols, the time domain length of each resource unit in this scheduling is 13.6×8=108.8. μs According to equation (2), the transition time from downlink to uplink during this scheduling = the end time of HEW-SIG2 + 20 × 108.8 μs =HEW-SIG2+2176 μs The location of the transition point is shown in FIG.

[0094] Also, when the signaling further comprises a frame structure indication field, and the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, the time domain location of the uplink transmission resource is expressed by Equation (3): Transmission time of uplink transmission resource = transition time + switching time from receiving to transmitting + uplink time indicated by next signaling It is as follows.

[0095] For the sake of example, the above embodiment is still used, and the transition time from downlink to uplink during this scheduling is the end time of HEW-SIG2 + 20 × 108.8 μs = End time of HEW-SIG2 + 2176 μsand the switching time from receive to transmit is 16 μs and the transmission time of the STA indicated by HEW-SIG2 after the uplink transmission is started is 25 μs Assuming that, according to equation (3), the transmission time of the uplink transmission resource = the end time of HEW-SIG2 + 2176 μs +16 μs +25 μs =End time of HEW-SIG2 + 2217 μs , The time domain location of the uplink transmission resource is shown in Figure 21, where the receive / transmit transition gap (abbreviated as RTG) in Equation (3) is the switch time from receive to transmit, and the uplink time indicated by HEW-SIG2 in Equation (3) is the uplink time indicated by the next signaling. The STA can obtain the time domain location of the uplink transmission resource by calculating according to Equation (3).

[0096] A method for receiving signaling in a WLAN according to this embodiment of the present invention includes the steps of receiving, by a STA, a signaling transmitted by an access point (AP), the signaling comprising an AP ID field, a BW field, a GI field, a CRC field, and a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the CP length required for data transmission following the signaling, the CRC field is used to protect fields before the CRC field in the signaling, and the Tail field is used to clear in the encoder and the decoder, where the CRC field and the Tail field are the last two fields in the signaling; and analyzing, by the STA, the AP ID field, the BW field, and the GI field to obtain the ID of the AP, and the bandwidth and CP length required for data transmission following the signaling, respectively, where if the ID of the AP does not match the AP ID associated with the STA, the analysis for the fields after the AP ID field is stopped. The above solution provides an OFDMA-based design solution for common signaling in a WLAN system, thereby resolving the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0097] EMBODIMENT 2 In this embodiment of the present invention, there is provided an AP 2200. Specifically, as shown in FIG.

[0098] The generating unit 2202 is configured to generate a signaling, the signaling including an AP ID field, a bandwidth BW field, a guard interval GI field, a cyclic redundancy check CRC field, and a terminal Tailand a Tail field, where the AP ID field is used to indicate the ID of the AP2200, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the CP length required for data transmission following the signaling, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0099] The sending unit 2203 is configured to send the signaling.

[0100] Preferably, the AP ID field is the first field in the signaling.

[0101] The signaling further comprises at least one of the following fields: a next signaling MCS field, a next signaling length field, a frame structure indication field, a SU / MU field, a transition time field, a duration field, a forward error correction FEC coding field, a number of STAs field, or a STA ID length field, where the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, and the SU / MU field is used to indicate whether this scheduled transmission is a SU transmission. The scheduling transmission may be a downlink or an MU transmission, the transition time field may be used to indicate the transition point from downlink to uplink, the duration field may be used to indicate the remaining duration of occupying the channel by this scheduling transmission, the FEC coding field may be used to indicate the data coding mode in this scheduling transmission, the STA number field may be used to indicate the number of STAs in this scheduling transmission, and the STAID length field may be used to indicate the length of the STAID of the STA in this scheduling transmission, where the frame structure of this scheduling transmission includes an uplink structure, a downlink structure, or a cascaded downlink and uplink structure.

[0102] Moreover, as shown in FIG. 23, the AP 2200 further includes a receiving unit 2204.

[0103] The receiving unit 2204 is configured to receive an uplink data packet sent by the STA after the sending unit 2203 sends the signaling when the frame structure indication field indicates that the frame structure of this scheduling transmission is an uplink structure; The sending unit 2203 is further configured to send an acknowledgement message to the STA, where the acknowledgement message is used to indicate that the AP 2200 receives the uplink data packet.

[0104] As shown in FIG. 23, the AP 2200 may further include a receiving unit 2204, if necessary.

[0105] The sending unit 2203 is further configured to, when the frame structure indication field indicates that the frame structure of the scheduling transmission is a downlink structure, send a downlink data packet to the STA after sending the signaling; The receiving unit 2204 is configured to receive an acknowledgement message sent by the STA, where the acknowledgement message is used to indicate that the STA receives the downlink data packet.

[0106] As shown in FIG. 23, the AP 2200 may further include a receiving unit 2204, if necessary.

[0107] The sending unit 2203 is further configured to, when the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, send a downlink data packet to the STA after sending the signaling; The receiving unit 2204 is configured to receive an uplink data packet and a first acknowledgement message sent by the STA, where the first acknowledgement message is used to indicate that the STA receives the downlink data packet; The sending unit 2203 is further configured to send a second acknowledgement message to the STA, where the second acknowledgement message is used to indicate that the AP 2200 has received the uplink data packet; or The receiving unit 2204 is further configured to receive an uplink data packet sent by the STA after the sending unit 2203 sends the signaling, when the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure; The transmitting unit 2203 is further configured to transmit a downlink data packet and a second acknowledgment message to the STA, where the second acknowledgment message is used to indicate that the AP2200 has received the uplink data packet, and the receiving unit 2204 is further configured to receive a first acknowledgment message transmitted by the STA, where the first acknowledgment message is used to indicate that the STA has received the downlink data packet.

[0108] Also, if the transition time from downlink to uplink is T, the value M of the transition time field is M = (T - end time of next signaling) / time domain length of each resource unit during this scheduling, It is as follows.

[0109] Specifically, for the method of transmitting signaling by using an AP in a WLAN, the description in embodiment 1 can be referred to, so detailed description will not be repeated in this embodiment of the present invention.

[0110] Since the AP of this embodiment can be configured to execute the method of embodiment 1 above, for the technical effects obtained in this embodiment, reference can be made to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0111] EMBODIMENT 3 In this embodiment of the present invention, there is provided a STA 2400. Specifically, as shown in FIG.

[0112] The receiving unit 2401 is configured to receive a signaling sent by an access point AP, the signaling including an AP identifier ID field, a bandwidth BW field, a guard interval GI field, a cyclic redundancy check CRC field, and a trailing t and a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the cyclic prefix CP length required for data transmission following the signaling, the CRC field is used to protect fields before the CRC field in the signaling, and the Tail field is used for clearing in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0113] The parsing unit 2402 is configured to parse the AP ID field, the BW field, and the GI field to obtain the ID of the AP, and the bandwidth and CP length required for data transmission following the signaling, respectively.

[0114] If the AP's ID does not match the AP ID associated with the STA 2400, parsing for fields after the AP ID field is stopped.

[0115] Preferably, the AP ID field is the first field in the signaling.

[0116] And the signaling further comprises at least one of the following fields: A field of the transmission modulation and coding scheme MCS of the next signaling in the signaling, a next signaling length field, a frame structure indication field, a single user SU / multi-user MU field, a transition time field, a duration field, a forward error correction FEC coding field, a number of STA2400s field, or a STA2400 ID length field, in which the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, and the SU / MU field is used to indicate that this scheduled transmission is a SU transmission. the transition time field is used to indicate the transition point from downlink to uplink, the duration field is used to indicate the remaining duration for occupying the channel by this scheduling transmission, the FEC coding field is used to indicate the data coding mode in this scheduling transmission, the STA2400 number field is used to indicate the number of STAs in this scheduling transmission, and the STAID length field is used to indicate the length of the STAID of the STA in this scheduling transmission, where the frame structure of this scheduling transmission includes an uplink structure, a downlink structure, or a cascaded downlink and uplink structure.

[0117] The parsing unit 2402 is configured to parse at least one of the following fields to obtain at least one of the following information, respectively, namely: The transmission MCS of the next signaling, the length of the next signaling, the frame structure of this scheduling transmission, whether this scheduling transmission is a SU transmission or a MU transmission, the transition point from downlink to uplink, the remaining duration when occupying the channel by this scheduling transmission, the data coding mode in this scheduling transmission, the number of STAs in this scheduling transmission, or the length of the STA ID of the STA in this scheduling transmission.

[0118] Also, as shown in FIG. 25, the STA 2400 includes a reading unit 2403, a determining unit 2404, and a transmitting unit 2405.

[0119] The reading unit 2403 is configured to read resource indication information of the upcoming signaling; The determining unit 2404 is configured to determine a resource location of the STA 2400 according to the resource indication information; The receiving unit 2401 is configured to receive downlink data packets at the resource location; or The sending unit 2405 is configured to send an uplink data packet at the resource location.

[0120] Also, when the signaling further comprises a transition time field, the parsing unit 2402 may: Specifically configured to determine a transition time from downlink to uplink according to a value of the transition time field, a time domain length of the resource unit, and an end time of the signaling by referring to a preset formula, the preset formula being: Transition time point = value of transition time field x time domain length of resource unit + end time of next signaling, It is as follows.

[0121] In addition, when the signaling further includes a frame structure indication field, and the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, the time domain location of the uplink transmission resource is: Transmission time of uplink transmission resource = transition time + switching time from receiving to transmitting + uplink time indicated by next signaling; It is as follows.

[0122] Specifically, for the method of receiving signaling by using a STA in a WLAN, the description in embodiment 1 can be referred to, so detailed description will not be repeated in this embodiment of the present invention.

[0123] Since the STA of this embodiment can be configured to execute the method of embodiment 1 above, for the technical effects obtained in this embodiment, reference can be made to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0124] EMBODIMENT 4 In this embodiment of the present invention, there is provided an AP 2600. Specifically, as shown in FIG.

[0125] The processor 2601 is further configured to generate signaling, the signaling including an AP ID field, a bandwidth BW field, a guard interval GI field, a cyclic redundancy check CRC field, and a trailing tand a Tail field, where the AP ID field is used to indicate the ID of the AP2600, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the length of the CP required for data transmission following the signaling, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0126] The transmitter 2602 is configured to transmit signaling.

[0127] Preferably, the AP ID field is the first field in the signaling.

[0128] And the signaling further comprises at least one of the following fields: a next signaling MCS field, a next signaling length field, a frame structure indication field, a SU / MU field, a transition time field, a duration field, a forward error correction FEC coding field, a number of STAs field, or a STA ID length field, in which the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, the SU / MU field is used to indicate whether this scheduled transmission is a SU transmission or a MU transmission, and the transition The time field is used to indicate a transition time from downlink to uplink, the duration field is used to indicate the remaining duration of occupying the channel by this scheduling transmission, the FEC coding field is used to indicate the data coding mode in this scheduling transmission, the STA number field is used to indicate the number of STAs in this scheduling transmission, and the STAID length field is used to indicate the length of the STAID of the STA in this scheduling transmission, where the frame structure of this scheduling transmission includes an uplink structure, a downlink structure, or a cascaded downlink and uplink structure.

[0129] As shown in FIG. 27, the AP 2600 further includes a receiver 2603.

[0130] The receiver 2603 is configured to receive an uplink data packet transmitted by the STA after the transmitter 2602 transmits the signaling when the frame structure indication field indicates that the frame structure of this scheduling transmission is an uplink structure; The transmitter 2602 is further configured to send an acknowledgement message to the STA, where the acknowledgement message is used to indicate that the AP 2600 has received the uplink data packet.

[0131] As shown in FIG. 27, the AP 2600 may further include a receiver 2603, if necessary. The transmitter 2602 is further configured to, when the frame structure indication field indicates that the frame structure of the scheduling transmission is a downlink structure, send a downlink data packet to the STA after sending the signaling; The receiver 2603 is configured to receive an acknowledgement message transmitted by a STA, where the acknowledgement message is used to indicate that the STA has received a downlink data packet.

[0132] As shown in FIG. 27, the AP 2600 may further include a receiver 2603, if necessary. The transmitter 2602 is further configured to, when the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, send a downlink data packet to the STA after sending the signaling; The receiver 2603 is configured to receive an uplink data packet and a first acknowledgement message transmitted by the STA, where the first acknowledgement message is used to indicate that the STA receives a downlink data packet; The transmitter 2602 is further configured to send a second acknowledgement message to the STA, where the second acknowledgement message is used to indicate that the AP 2600 has received the uplink data packet; or The receiver 2603 is further configured to receive an uplink data packet transmitted by the STA after the transmitter 2602 transmits the signaling when the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure; The transmitter 2602 is further configured to transmit the downlink data packet and a second acknowledgement message to the STA, where the second acknowledgement message is used to indicate that the AP 2600 has received the uplink data packet; The receiver 2603 is further configured to receive a first acknowledgement message transmitted by the STA, where the first acknowledgement message is used to indicate that the STA is to receive the downlink data packet.

[0133] Also, if the transition time from downlink to uplink is T, the value M of the transition time field is M=(T-end time of next signaling) / time domain length of each resource unit during this scheduling.

[0134] Specifically, for the method of transmitting signaling by using an AP in a WLAN, the description in embodiment 1 can be referred to, so detailed description will not be repeated in this embodiment of the present invention.

[0135] Since the AP of this embodiment can be configured to execute the method of embodiment 1 above, for the technical effects obtained in this embodiment, reference can be made to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0136] EMBODIMENT 5 In this embodiment of the present invention, there is provided a STA 2800. Specifically, as shown in FIG.

[0137] The receiver 2801 is configured to receive signaling transmitted by an access point AP, the signaling including an AP identifier ID field, a bandwidth BW field, a guard interval GI field, a cyclic redundancy check CRC field, and a trailing tand a Tail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the GI is used to indicate the cyclic prefix CP length required for data transmission following the signaling, the CRC field is used to protect fields before the CRC field in the signaling, and the Tail field is used for clearing in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0138] The processor 2802 is configured to analyze the AP ID field, the BW field, and the GI field to obtain an ID of the AP, a bandwidth required for data transmission following the signaling, and a CP length, respectively; If the AP's ID does not match the AP ID associated with the STA 2800, parsing for fields after the AP ID field is stopped.

[0139] Preferably, the AP ID field is the first field in the signaling.

[0140] And the signaling further comprises at least one of the following fields: A field of a transmission modulation and coding scheme MCS of the next signaling in the signaling, a next signaling length field, a frame structure indication field, a single user SU / multi-user MU field, a transition time field, a duration field, a forward error correction FEC coding field, a number of STAs field, or a STA ID length field, where the next signaling MCS field is used to indicate the transmission MCS of the next signaling, the next signaling length field is used to indicate the length of the next signaling, the frame structure indication field is used to indicate the frame structure of this scheduled transmission, and the SU / MU field is used to indicate that this scheduled transmission is a SU transmission. the transition time field is used to indicate the transition point from downlink to uplink, the duration field is used to indicate the remaining duration for occupying the channel by this scheduling transmission, the FEC coding field is used to indicate the data coding mode in this scheduling transmission, the STA number field is used to indicate the number of STAs in this scheduling transmission, and the STAID length field is used to indicate the length of the STAID of the STA in this scheduling transmission, where the frame structure of this scheduling transmission includes an uplink structure, a downlink structure, or a cascaded downlink and uplink structure.

[0141] The processor 2802 is further configured to parse at least one of the following fields to obtain at least one of the following information, namely: The transmission MCS of the next signaling, the length of the next signaling, the frame structure of this scheduling transmission, whether this scheduling transmission is a SU transmission or a MU transmission, the transition point from downlink to uplink, the remaining duration when this scheduling transmission occupies the channel, the data coding mode in this scheduling transmission, the number of STAs in this scheduling transmission, or the length of the STA ID of the STA in this scheduling transmission.

[0142] The STA 2800 further includes a transmitter 2803.

[0143] The processor 2802 is further configured to read resource indication information in the upcoming signaling, and identify a resource location of the STA 2800 according to the resource indication information; The receiver 2801 is further configured to receive a downlink data packet at the resource location; or The transmitter 2803 is configured to transmit uplink data packets at the resource locations.

[0144] Also, if the signaling comprises a transition time field, the processor 2802 Specifically configured to determine a transition time from downlink to uplink according to a value of the transition time field, a time domain length of the resource unit, and an end time of the signaling by referring to a preset formula, the preset formula being: Transition time point = value of transition time field x time domain length of resource unit + end time of next signaling, It is as follows.

[0145] In addition, when the signaling further includes a frame structure indication field, and the frame structure indication field indicates that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, the time domain location of the uplink transmission resource is: The transmission time of the uplink transmission resource = transition time + switching time from receiving to transmitting + uplink time indicated by the next signaling.

[0146] Specifically, for the method of receiving signaling by using a STA in a WLAN, the description in embodiment 1 can be referred to, so detailed description will not be repeated in this embodiment of the present invention.

[0147] Since the STA of this embodiment can be configured to execute the method of embodiment 1 above, for the technical effects obtained in this embodiment, reference can be made to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0148] EMBODIMENT 6 According to this embodiment of the present invention, a method for transmitting signaling in a WLAN is provided, and the method is particularly applied to a scenario where there is only SU transmission. As shown in Figure 30, the method includes the following steps:

[0149] S3001.AP generates signaling, which includes an AP ID field, a BW field, a SU / MU field, a GI field, a STAID field, a field for MCS of the data in the non-preamble part, an FEC encoding field, an STBC field, a Number of Spatial Streams field (NSS), an aggregation field, a smoothing field, a CRC field, and a Tail field.

[0150] The AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the SU / MU field is used to indicate that this transmission is a SU transmission, the GI field is used to indicate the CP length required for the data transmission following the signaling, the STAID field is used to indicate the identifier of the STA in this scheduled transmission, the transmission modulation and coding scheme MCS field of the data in the non-preamble part is used to indicate the transmission MCS of the data in the non-preamble part, the FEC coding field is used to indicate the data coding mode of the data in the non-preamble part, and the STBC field is used to indicate the data coding mode of the data in the non-preamble part. The NSS field is used to indicate whether the data transmission following the signaling in the SU transmission is performed using the STBC method, the NSS field is used to indicate the number of streams used in the SU transmission, the aggregation field is used to indicate whether the data in the non-preamble part is a single MPDU or an aggregation of MPDUs, the smoothing field is used to indicate information regarding transmission using the beamforming method, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0151] S3002. The AP transmits signaling.

[0152] Specifically, an embodiment will be described in which the signaling generated by the AP is called HEW-SIG1. The location of HEW-SIG1 in the data frame is shown in FIG. 9, and one OFDM symbol carries 24-bit information, and HEW-SIG1 is divided into two 4 μsAs shown in FIG. 31, in a scenario where there is only SU transmission, HEW-SIG1 includes an AP ID field, a BW field, a SU / MU field, a GI field, a STAID field, a field of MCS in the non-preamble part, an FEC coding field, an STBC field, an NSS field, an aggregation field, a smoothing field, a CRC field, and a trailing t The order of the fields and the number of bits in each field are shown in Figure 31.

[0153] In this embodiment, the NSS field is indicated using 3 bits, and may be designed such that 000 represents one spatial stream, 001 represents two spatial streams, 010 represents three spatial streams, 011 represents four spatial streams, 100 represents five spatial streams, 101 represents six spatial streams, 110 represents seven spatial streams, and 111 represents eight spatial streams.

[0154] In this embodiment, the smoothing field is used to indicate information regarding transmission using the beamforming method, and specifically, the receiving side may be instructed to determine whether channel smoothing can be performed depending on whether beamforming has been performed.

[0155] In this embodiment of the present invention, the method of indicating the transmission MCS field of the data in the non-preamble part is the same as the method of indicating the MCS field of the current standard (802.11a, 802.11n, or 802.11ac, etc.), the method of indicating the STBC field is the same as the method of indicating the STBC field of the current standard (802.11n or 802.11ac, etc.), and the method of indicating the aggregated field and the smoothed field is the same as the method of indicating the aggregated field and the smoothed field of the current standard (802.11n, etc.). This is not particularly limited in this embodiment of the present invention.

[0156] It should be noted that the configuration shown in FIG. 31 is applicable to both uplink transmission and downlink transmission. Specifically, whether uplink transmission or downlink transmission has been performed can be determined by the AP ID, the STA ID, and the received / transmitted signal. For example, when the STA is the receiver and the AP is the sender, after receiving and analyzing the signaling transmitted by the AP, the STA can confirm that the AP ID included in the signaling is consistent with the ID of the AP associated with the STA, and thus determine that the downlink transmission has been performed. If necessary, a UL / DL indication field can be further added to FIG. 31. This is not particularly limited in this embodiment of the present invention.

[0157] In addition, the structural design solution of HEW-SIG1 is illustrated in Fig. 31 as an example. The positions of specific fields in Fig. 31, the symbols in which the specific fields are located, and the number of bits used by each field may of course all be adjusted, for example, the STAID field may be indicated using 5 to 10 bits, and the NSS field may be indicated using 2 or 4 bits. In this regard, there is no particular limitation in this embodiment of the present invention.

[0158] According to this embodiment of the present invention, a method for transmitting signaling in a WLAN is provided, and the method is particularly applied to a scenario where there is only SU transmission. As shown in Figure 32, the method includes the following steps:

[0159] S3201.STA receives signaling transmitted by the AP, and the signaling includes an AP ID field, a BW field, a SU / MU field, a GI field, a STA ID field, an MCS field for the data in the non-preamble portion, an FEC encoding field, an STBC field, an NSS field, an aggregation field, a smoothing field, a CRC field, and a Tail field.

[0160] The AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the SU / MU field is used to indicate that this transmission is a SU transmission, the GI field is used to indicate the CP length required for the data transmission following the signaling, the STAID field is used to indicate the identifier of the STA in this scheduled transmission, the transmission modulation and coding scheme MCS field of the data in the non-preamble part is used to indicate the transmission MCS of the data in the non-preamble part, the FEC coding field is used to indicate the data coding mode of the data in the non-preamble part, and the STBC field is used to indicate the data coding mode of the data in the non-preamble part. The NSS field is used to indicate whether the data transmission following the signaling in the SU transmission is performed using the STBC method, the NSS field is used to indicate the number of streams used in the SU transmission, the aggregation field is used to indicate whether the data in the non-preamble part is a single MPDU or an aggregation of MPDUs, the smoothing field is used to indicate information regarding transmission using the beamforming method, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0161] The S3202.STA analyzes the AP ID field, the BW field, the SU / MU field, the GI field, the STA ID field, the MCS field of the data in the non-preamble part, the FEC coding field, the STBC field, the NSS field, the aggregation field, and the smoothing field to obtain the following information, respectively, which are: the ID of the AP, the bandwidth and CP length required for the data transmission following the signaling, whether this transmission is a SU transmission, the identifier of the STA in this scheduled transmission, the transmission MCS of the data in the non-preamble part, the data coding mode of the data in the non-preamble part, whether the data transmission following the signaling in the SU transmission is performed in the STBC method, the number of streams used in the SU transmission, whether the data in the non-preamble part is a single MPDU or an aggregate of MPDUs, and information on beamforming; If the ID of the AP does not match the AP ID associated with the STA, parsing stops for fields after the AP ID field.

[0162] Specifically, in this embodiment of the present invention, reference can be made to Figure 31 for a schematic configuration diagram of the signaling received by the STA, so detailed descriptions will not be repeated in this embodiment of the present invention.

[0163] Assume that the schematic configuration diagram of the signaling received by the STA is shown in Figure 31. A schematic flow chart showing the analysis of the signaling HEW-SIG1 by the STA after receiving a data packet is shown here. As shown in Figures 33A and 33B, the procedure includes the following steps:

[0164] S3301. The AP ID field is parsed to obtain the ID of the AP that the STA uses when performing the current transmission.

[0165] S3302. According to the ID of the AP, determine whether the received data packet is a data packet sent by the AP associated with the STA.

[0166] If the received data packet is a data packet transmitted by the AP associated with the STA, step S3303 is executed; otherwise, the received data packet is: If the data packet is not sent by the AP associated with the STA, the procedure ends.

[0167] The S3303.BW field is parsed to obtain the bandwidth required for subsequent data transmissions of HEW-SIG1.

[0168] S3304. Parse the SU / MU field to see if this transmission is a SU transmission.

[0169] The S3305.STAID field is read to obtain information regarding the identifier of the STA in this transmission.

[0170] S3306. Analyze the transmission MCS field and the FEC encoding field of the data in the non-preamble portion to determine information regarding the transmission MCS and data encoding mode that is part of the data in the non-preamble portion of the transmission.

[0171] S3307. Analyze the STBC and NSS fields to determine whether the subsequent data transmissions of HEW-SIG1 in this transmission were performed in the STBC manner and the information on the number of streams used in the SU transmission.

[0172] S3308. Analyze the aggregation field and the smoothing field to determine whether the data in the non-preamble part is a single MPDU or an aggregation of MPDUs, and information regarding beamforming.

[0173] S3309. Receive subsequent data of HEW-SIG1 in this transmission according to analysis information regarding the transmission MCS and data coding mode which are part of the data in the non-preamble part of this transmission, analysis information regarding whether the subsequent data transmission of HEW-SIG1 in this transmission was performed using the STBC method, analysis information regarding the number of streams used in the SU transmission, analysis information regarding whether the data in the non-preamble part is a single MPDU or an aggregation of MPDUs, and analysis information regarding beamforming.

[0174] It should be noted that if the transmission is a MU transmission, the STA may receive the data according to the carrier allocation format of the MU, which is not particularly limited in this embodiment of the present invention.

[0175] In the method for transmitting signaling in a WLAN according to this embodiment of the present invention, in a scenario of SU transmission, the signaling may be generated by a STA, and the AP receives the signaling transmitted by the STA, where the structure of the signaling is similar to that of Fig. 31, and the schematic flow chart representing the analysis of the signaling HEW-SIG1 by the AP after receiving the signaling is similar to that of Fig. 33A and Fig. 33B. The difference is that when the AP analyzes the signaling HEW-SIG1, the description in step S3302 of "determine according to the ID of the AP whether the received data packet is a data packet transmitted by the AP associated with the STA" needs to be replaced with "determine according to the ID of the AP whether the data packet has been transmitted to the AP". This case is not described in this embodiment of the present invention, but the description of the above embodiment can be referred to for details.

[0176] The above solution provides an OFDMA-based design solution for common signaling in a WLAN system, thereby resolving the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0177] EMBODIMENT 7 According to this embodiment of the present invention, a method for transmitting signaling in a WLAN is provided. As shown in Figure 34, the method includes the following steps:

[0178] S3401. The AP generates signaling, which includes an AP ID field, a BW field, a GI field, a frame structure indication field, a downlink / uplink STA number field, a CRC field, and a Tail field.

[0179] The AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the GI is used to indicate the CP length required for the data transmission following the signaling, the frame structure indication field is used to indicate that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, the downlink / uplink STA number field is used to indicate the number of downlink / uplink users in this scheduling transmission, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0180] S3402. The AP transmits signaling.

[0181] In this embodiment of the present invention, a downlink / uplink STA number field is specifically introduced. When the frame structure indication field indicates that the frame structure of this scheduling transmission is cascaded downlink and uplink, the downlink / uplink STA number field in this transmission is read, and judge whether the signaling of resource indication information indicates downlink transmission resource or uplink transmission resource.

[0182] In addition, the signaling in this embodiment of the present invention may further include another field in addition to the AP ID field, the BW field, the GI field, the frame structure indication field, the downlink / uplink STA number field, the CRC field, and the Tail field. In this regard, the present embodiment of the present invention is not particularly limited.

[0183] An example will be described in which the signaling generated by the AP is called HEW-SIG1. The location of HEW-SIG1 in the data frame is shown in FIG. 9, and one OFDM symbol carries 24-bit information, and HEW-SIG1 is divided into two 4 μs It is assumed that the OFDM symbol includes the following fields: AP ID field, BW field, SU / MU field, GI field, frame structure indication field, downlink STA number field, transition time field, HEW-SIG2 MCS field, HEW-SIG2 length field, CRC field, and end field. t The order of the fields and the number of bits in each field are shown in Figure 31.

[0184] For example, as shown in FIG. 36, HEW-SIG1 has three 4 μs Assuming that the OFDM symbols are included in the above, HEW-SIG1 includes an AP ID field, a duration field, a BW field, a SU / MU field, a GI field, a HEW-SIG2 MCS field, a HEW-SIG2 MCS field, a frame structure indication field, a STA number field, a downlink STA number field, a STA ID length field, a transition time field, a CRC field, and a trailing digit. t The order of the fields and the number of bits in each field are shown in Figure 36.

[0185] 35 and 36 show the structural design solution of HEW-SIG1 as an example. The positions of specific fields in Fig. 35 and Fig. 36, the symbols in which the specific fields are located, and the number of bits used by each field may of course be adjusted. This is not particularly limited in this embodiment of the present invention.

[0186] According to this embodiment of the present invention, a method for transmitting signaling in a WLAN is provided. As shown in Figure 37, the method includes the following steps:

[0187] S3701.STA receives signaling transmitted by the AP, and the signaling includes an AP ID field, a BW field, a GI field, a frame structure indication field, a downlink / uplink STA number field, a CRC field, and a Tail field.

[0188] The AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the GI is used to indicate the CP length required for the data transmission following the signaling, the frame structure indication field is used to indicate that the frame structure of this scheduling transmission is a cascaded downlink and uplink structure, the downlink / uplink STA number field is used to indicate the number of downlink / uplink users in this scheduling transmission, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0189] S3702.STA analyzes the AP ID field, the BW field, the GI field, the frame structure indication field, and the downlink / uplink STA number field to obtain the following information respectively, which are: The ID of the AP, the bandwidth and CP length required for data transmission following the signaling, whether the frame structure of this scheduling transmission is a cascade downlink and uplink structure, and the number of downlink / uplink users in this scheduling transmission; If the ID of the AP does not match the AP ID associated with the STA, parsing stops for fields after the AP ID field.

[0190] Specifically, in this embodiment of the present invention, reference can be made to Figures 35 and 36 for schematic configuration diagrams of the signaling received by the STA, so detailed descriptions will not be repeated in this embodiment of the present invention.

[0191] Specifically, assuming that the schematic configuration diagram of the signaling received by the STA is particularly shown in Figure 35, after reading the frame structure indication field of HEW-SIG1 and confirming that the frame structure of this scheduling transmission is structure cascade downlink and uplink, the STA further reads the downlink STA number field and identifies the number of users scheduled in the downlink. For example, if k users are scheduled in the downlink, when reading the resource allocation information and reading the first k resource allocation information in the STA, the STA confirms that the information allocated at this time is downlink information, and the information allocated after the k resource allocation information is uplink information. Therefore, in each resource allocation information of the STA, it is not necessary to indicate whether the allocation information is downlink allocation information or uplink allocation information.

[0192] In the signaling structure shown in FIG. 35, the downlink STA number field may of course be replaced by the uplink STA number field. The uplink STA number field is used to indicate the number of uplink users in this scheduling transmission, i.e., the number of users scheduled in the uplink. After reading the frame structure indication field of HEW-SIG1 and confirming that the frame structure of this scheduling transmission is a cascade downlink and uplink structure, the STA further reads the uplink STA number field and identifies the number of users scheduled in the uplink. Assuming that k users are scheduled in the uplink, when reading the resource allocation information and reading the first k resource allocation information in the STA, the STA confirms that the information allocated at this time is uplink information, and the information allocated after the k resource allocation information is downlink information. Similarly, in each resource allocation information of the STA, there is no need to indicate whether the allocation information is downlink allocation information or uplink allocation information.

[0193] Specifically, assuming that the schematic configuration diagram of the signaling received by the STA is particularly shown in Figure 36, the STA determines whether the resource allocation instruction information is a downlink instruction or an uplink instruction according to the STA number field and the downlink STA number field, so there is no need to add an instruction indicating whether the assignment information is downlink assignment information or uplink assignment information to the resource allocation instruction information for each assignment information. For example, if the number of scheduled STAs is 16 and the number of downlink STAs is 8, the first 8 pieces of resource allocation information are instructions for downlink assignment information, and the remaining 8 pieces of resource allocation information are instructions for uplink assignment information.

[0194] Similarly, the downlink STA number field in FIG. 36 may be replaced with the uplink STA number field. The uplink STA number field is used to indicate the number of uplink users in this scheduling transmission, i.e., the number of users scheduled in the uplink. The principle of use is the same as the above method. For example, if the number of scheduled STAs is 16 and the number of uplink STAs is 8, the first 8 resource allocation information pieces are indications of uplink allocation information, and the remaining 8 resource allocation information pieces are indications of downlink allocation information. In this way, a state can be realized in which it is not necessary to add an indication of whether the allocation information is downlink allocation information or uplink allocation information to the resource allocation indication information for each allocation information.

[0195] The above solution provides an OFDMA-based design solution for common signaling in a WLAN system, thereby resolving the problem in the prior art that there is no OFDMA-based design solution for common signaling in a WLAN system.

[0196] EMBODIMENT 8 In this embodiment of the present invention, a STA 3800 is provided. As shown in FIG.

[0197] The generating unit 3801 is configured to generate signaling when the transmission is a SU transmission, the signaling including an access point identifier AP identifier ID field, a bandwidth BW field, a SU / multi-user MU field, a guard interval GI field, a station identifier STAID field, a transmission modulation and coding scheme MCS field for data in the non-preamble part, a forward error correction FEC coding field, a space-time block coding STBC field, a number of spatial streams NSS field, an aggregation field, a smoothing field, a cyclic redundancy check CRC field, and a trailing tand a .ail field, where the AP ID field is used to indicate the ID of the AP, the BW field is used to indicate the bandwidth required for the data transmission following the signaling, the SU / MU field is used to indicate that this transmission is a SU transmission, the GI field is used to indicate the cyclic prefix CP length required for the data transmission following the signaling, the STA ID field is used to indicate the identifier of the STA in this scheduling transmission, the transmission modulation and coding scheme MCS field of the data in the non-preamble part is used to indicate the transmission MCS of the data in the non-preamble part, the FEC coding field is used to indicate the data coding mode of the data in the non-preamble part, and the STBC field is used to indicate The signaling in the SU transmission indicates whether the data transmission following is performed in the STBC method, the NSS field is used to indicate the number of streams used in the SU transmission, the aggregation field is used to indicate whether the data in the non-preamble part is a single media access control protocol data unit MPDU or an aggregation of MPDUs, the smoothing field is used to indicate information regarding transmission in the beamforming method, the CRC field is used to protect the field before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0198] The transmitting unit 3802 is configured to transmit signaling.

[0199] Since the STA3800 of this embodiment can be configured to execute the method of embodiment 6 above, the technical effects obtained in this embodiment can be referred to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0200] EMBODIMENT 9 In this embodiment of the present invention, there is provided an AP 3900. As shown in FIG 39, the AP 3900 includes a receiving unit 3901 and an analyzing unit 3902.

[0201] The receiving unit 3901 is configured to receive signaling transmitted by the station STA when the transmission is a single-user SU transmission, the signaling including an AP identifier ID field, a bandwidth BW field, a SU / multi-user MU field, a guard interval GI field, a station identifier STAID field, a transmission modulation and coding scheme MCS field for data in the non-preamble part, a forward error correction FEC coding field, a space-time block coding STBC field, a number of spatial streams NSS field, an aggregation field, a smoothing field, a cyclic redundancy check CRC field, and a trailing edge 111 field. tand a sigil field, in which the AP ID field is used to indicate the ID of the AP3900, the BW field is used to indicate the bandwidth required for data transmission following the signaling, the SU / MU field is used to indicate that this transmission is a SU transmission, the GI field is used to indicate the cyclic prefix CP length required for data transmission following the signaling, the STAID field is used to indicate the identifier of the STA in this scheduling transmission, the transmission modulation and coding scheme MCS field of the data in the non-preamble part is used to indicate the transmission MCS of the data in the non-preamble part, the FEC coding field is used to indicate the data coding mode of the data in the non-preamble part, and the ST The BC field is used to indicate whether the data transmission following the signaling in the SU transmission is performed using the STBC method, the NSS field is used to indicate the number of streams used in the SU transmission, the aggregation field is used to indicate whether the data in the non-preamble part is a single MPDU or an aggregation of MPDUs, the smoothing field is used to indicate information regarding transmission using the beamforming method, the CRC field is used to protect the fields before the CRC field in the signaling, and the Tail field is used to clear in the encoder and decoder, where the CRC field and the Tail field are the last two fields in the signaling.

[0202] The parsing unit 3902 is configured to parse the AP ID field, the BW field, the GI field, the SU / MU field, the STA ID field, the field of the transmission MCS of the data in the non-preamble part, the FEC coding field, the STBC field, the NSS field, the aggregation field, and the smoothing field to obtain the following information respectively, which are: The ID of the AP3900, the bandwidth and CP length required for data transmission following the signaling, whether this transmission is a SU transmission, the identifier of the STA in this scheduling transmission, the transmission MCS of the data in the non-preamble part, the data coding mode of the data in the non-preamble part, whether the data transmission following the signaling in the SU transmission was performed using the STBC method, the number of streams used in the SU transmission, whether the data in the non-preamble part is a single MPDU or an aggregate of MPDUs, and information regarding beamforming, If the ID of the AP does not match the AP ID of the AP, parsing stops for fields after the AP ID field.

[0203] Since the AP3900 of this embodiment can be configured to execute the method of embodiment 6 above, the technical effects obtained in this embodiment can be referred to the description of the above embodiment, and therefore detailed descriptions will not be repeated here.

[0204] The above description is merely a specific implementation of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications or replacements that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be within the scope of protection of the claims.

[0205] Those skilled in the art can understand that in addition to Fig. 9, a frame structure related to the present invention can be further shown in Fig. 9a, where in an uplink frame or a downlink frame, a signaling HEW-SIG1 is located after a legacy preamble, or a signaling HEW-SIG2 is further included, and the signaling HEW-SIG1 can include a HE-SIG-A, or further includes a HE-SIG-B. Specifically, an uplink frame can also include a legacy preamble (L preamble) and a signaling HEW SIG1. The HEW-SIG2 of the downlink frame and the L preamble, HEW-SIG1, or HEW-SIG2 of the uplink frame are optionally provided. The HE-SIG-A or HE-SIG-B of the HEW-SIG1 are also optionally provided.

[0206] In the downlink frame, the HEW SIG1 may be divided into two parts. A fixed MCS with a fixed symbol length and number of symbols is used to transmit the first part (which may be called HE-SIG-A) to transmit basic signaling and to determine whether the radio frame is within the frame format of 11ax. For the second part (which may be called HE-SIG-B), a variable number of symbols with a variable length may be used, where variable length means that the CP length is selected according to the channel environment. The CP length and number of symbols of HE-SIG-B may be indicated in HE-SIG-A. In the SU scenario, for HE-SIG-B, the symbol length and number of symbols may be variable, or the CP length may be fixed, or the number of symbols may be fixed, or both the CP length and the number of symbols are fixed. Signaling for a specific STA may also be located at the beginning of the resources allocated by the STA, for example, HEW-SIG2 of the downlink frame in FIG. 9a.

[0207] In the MU scenario, when the first signaling HE-SIG-A is repeatedly transmitted in the 802.11a subcarrier allocation manner in each 20 MHz bandwidth of the channel in the BSS set by the AP, the fields of the first signaling HE-SIG-A may be in the format shown in Figure 40a, Figure 40b, and Figure 40c. As shown in Figure 41, a schematic flow chart showing the analysis of the signaling HEW-SIG-A by the receiving side after receiving the data packet is exemplarily shown here. In the MU scenario, for the indication method of HE-SIG-A shown in Figure 40a, Figure 40b, and Figure 40c, resource indication information and configuration parameters for specific data parts, such as transmission MCS, STAID / GID, transmitted space-time stream number, indication on specific resource location, indication for each STA and indicating whether LDPC was used, or indication indicating whether STBC was used, are placed in the HE-SIG-B for indication purposes.

[0208] As shown in Fig. 41, Fig. 41 is a schematic flow chart showing the analysis of the signaling HEW-SIG-A by the STA. In general, the STA sequentially analyzes the content in the HEW-SIG-A, and performs corresponding operations according to the content obtained by the analysis, and the detailed description is not repeated here.

[0209] Of course, the implementation of the present invention may further include other specific frame structures. For example, when the SU / MU field indicates SU transmission, i.e., in the SU scenario, in each 20 MHz bandwidth of the channel in the BSS set by the AP, when the first signaling HE-SIG-A is repeatedly transmitted in the subcarrier allocation manner of 802.11a, the first signaling HE-SIG-A may include two OFDM symbols, and the signaling information carried in each OFDM symbol is shown in Figure 40d. The HE-SIG-A may include four OFDM symbols as required, where the second OFDM symbol has the content of the first OFDM symbol, and the fourth OFDM symbol has the content of the third OFDM symbol, which means that the second OFDM symbol and the fourth OFDM symbol are respectively repeated in the time domain of the first OFDM symbol and the third OFDM symbol. In this case, the content carried in the first, second, third and fourth symbols is shown in Figure 40e. Each OFDM symbol may also be repeated in the frequency domain as necessary, with each OFDM symbol carrying 12-bits of information. The content of the HE-SIG-A carried using four OFDM symbols repeated in the frequency domain may be shown using Figure 40e.

[0210] In order to ensure the reliability of the transmission of HE-SIG-A, when the symbols of HE-SIG-A are repeated in the time domain during the SU transmission, only two repeated symbols may be used to carry the information of HE-SIG-A. As shown in Fig. 40f, the second OFDM symbol is a repeat of the first OFDM symbol in the time domain. Each symbol may be repeated in the frequency domain of the symbol as necessary, in which case the content of HE-SIG-A carried in two symbols may be shown using Fig. 40f. When HE-SIG-A is carried using only two symbols repeated in the time domain or frequency domain as shown in Fig. 40f, some common signaling needs to be indicated in HE-SIG-B. HE-SIG-B may not be transmitted in the time domain or frequency domain repetitive transmission method, but is transmitted separately on each symbol. HE-SIG-B may be transmitted using a higher MCS as necessary. HE-SIG-B may not be repeatedly transmitted in each 20 MHz bandwidth, if necessary, but is transmitted on all channels of the BSS set by the AP. HE-SIG-B may be repeatedly transmitted in each 20 MHz bandwidth, if necessary. When HE-SIG-B is transmitted in a 20 MHz bandwidth using MCS0, the content carried in HE-SIG-B may be shown in Figures 40g and 40h. In Figure 40g, HE-SIG-B is shown carried using only one symbol during SU transmission, and in Figure 40h, the content of HE-SIG-B is shown carried using two symbols during SU transmission. When HE-SIG-B is transmitted using a higher MCS than MCS0 or using a bandwidth higher than 20 MHz, some or all of the content carried by HE-SIG-B may be consistent with Figures 40g and 40h, and only the combination of fields in the OFDM symbols may be different.

[0211] During SU transmission, the content of HE-SIG-A may be carried using three OFDM symbols, where each symbol is repeated in the frequency domain, so that each OFDM symbol can carry 12-bit information. The content of HE-SIG-A carried in the three OFDM symbols may be shown separately in Figure 40i, Figure 40j, and Figure 40l. When using HE-SIG-A shown in Figure 40i, the HE-SIG-B part may not be necessary. When using HE-SIG-A shown in Figure 40j, the HE-SIG-B part is needed to supplement the signaling indication during SU transmission. HE-SIG-B may not be transmitted in a time domain repetitive transmission method or a frequency domain repetitive transmission method, but is transmitted individually on each symbol. HE-SIG-B may be transmitted using a higher MCS, if necessary. HE-SIG-B may not be transmitted repeatedly in each 20 MHz bandwidth, if necessary, but is transmitted on all channels of the BSS set by the AP. HE-SIG-B may be repeatedly transmitted on each 20 MHz bandwidth as needed. When HE-SIG-B is transmitted on a 20 MHz bandwidth using MCS0, the content carried on HE-SIG-B may be shown in Figure 40k, where one OFDM symbol is used to carry the content of HE-SIG-B. When HE-SIG-B is transmitted using a higher MCS than MCS0 or using a bandwidth higher than 20 MHz, some or all of the content carried by HE-SIG-B may be consistent with Figure 40k, and only the combination of fields in the OFDM symbol may be different. When SU ​​transmission is in progress and HE-SIG-A shown in Figure 40l is used, the HE-SIG-B part is needed to supplement the signaling indication during SU transmission. HE-SIG-B may not be transmitted in a time domain repetitive transmission method or a frequency domain repetitive transmission method, but is transmitted individually on each symbol. HE-SIG-B may be transmitted using a higher MCS as needed.HE-SIG-B may not be repeatedly transmitted in each 20 MHz bandwidth, if necessary, but is transmitted on all channels of the BSS configured by the AP. HE-SIG-B may be repeatedly transmitted in each 20 MHz bandwidth, if necessary. If HE-SIG-B is transmitted in a 20 MHz bandwidth using MCS0, the content carried in HE-SIG-B may be shown in Figure 40m, where two OFDM symbols are used to carry the content of HE-SIG-B. If HE-SIG-B is transmitted using a higher MCS than MCS0, if necessary, or using a bandwidth higher than 20 MHz, some or all of the content carried by HE-SIG-B may be consistent with Figure 40m, and only the combination of fields in the OFDM symbols may be different.

[0212] While the signaling structure of HE-SIG-1 is shown in Figures 40f to 40m, Figure 42 shows an exemplary schematic flowchart illustrating the analysis of signaling HEW-SIG-1 by the receiving side after receiving a data packet, and detailed descriptions will not be repeated here.

[0213] In another embodiment, in the structure shown in Figure 9a, and in the case of SU transmission, the structure, fields, or sequence of HE-SIG-1 in the downlink frame may be similar to that of the uplink frame. The content, structure, and sequence of HE-SIG-1 in the downlink frame in the case of MU transmission have been described in the above embodiment, but the structure, fields, or sequence of HE-SIG-1 in the uplink frame, particularly the structure, fields, or sequence of HE-SIG-A, may be consistent with that of HE-SIG-A in the downlink frame, but the specific carried content may be different.

[0214] Specifically, during uplink transmission, the HE-SIG-A is repeatedly transmitted in the 802.11a subcarrier allocation manner in each 20 MHz bandwidth of the channel in the BSS set by the AP. During uplink multi-user transmission, the STAs performing uplink multi-user transmission must transmit identical content in the HE-SIG-A and ensure that the waveform of the air interface formed is consistent, so that the AP and / or another STA can analyze the HE-SIG-A. To form the same wavelength, the identical waveforms transmitted by multiple STAs are overlapped in the air. In this case, the HE-SIG-A of each STA carries the same content. Only after analyzing the HE-SIG-A, the STA or AP checks whether this transmission is a downlink transmission or an uplink transmission, so the number of symbols, fields, and structure of the HE-SIG-A transmitted in the uplink must be consistent with those of the HE-SIG-A transmitted in the downlink.

[0215] In order to ensure that the waveforms of the HE-SIG-As transmitted in the uplink by all STAs in multi-user transmission are consistent, the contents of the fields of the HE-SIG-As transmitted by all STAs need to be identical. Since the scheduling is performed by the AP in the uplink transmission, and the receiver of the uplink transmission is the AP, the AP checks the relevant parameter information and resource configuration information of the uplink transmission. In this way, the transmission parameters and resource configuration information of the HE-SIG-A in the uplink multi-user transmission can be configured by initial setting, for example, the field values ​​in the HE-SIG-As of all STAs in the uplink multi-user transmission are set to 0 or a specific prescribed field or sequence.

[0216] However, some fields need to indicate corresponding information to the receiving side or other STAs, so the fields cannot be set to default values, but need to indicate corresponding information according to the actual state. These fields include, but are not limited to, SU / MU indication field, AP ID field, TXOP transmission duration field, etc. The SU / MU indication field needs to indicate whether the upcoming radio frame is a single-user transmission SU or a multi-user transmission MU, so that the indication needs to be made according to the actual state, so that the receiving side can receive with a correct frame format. The AP ID field is used to indicate the information of the AP related to the radio packet, so that another AP or STA judges whether the radio frame is related to the AP or STA. If the radio frame is related to the AP or STA, the AP or STA continues to receive and analyze the radio packet. If the radio frame is not related to the AP or STA, the AP or STA immediately ends reception or stops analyzing. Therefore, the AP ID field also needs to indicate according to the actual state, and it cannot be arbitrarily configured by default. The TXOP transmission duration field is used to indicate the remaining duration in the current scheduling period of the AP, so that another AP or STA can obtain information about the remaining duration when occupying the channel and configure NAV information. Therefore, the TXOP transmission duration field also needs to be configured according to the actual situation, rather than being arbitrarily configured by default.

[0217] It should be noted that, even though the SU / MU indication field, AP ID field, TXOP transmission duration field, etc. need to indicate according to the actual state and cannot be arbitrarily configured, the configuration of the fields of the STA in uplink multi-user transmission needs to be the same, which means that the contents carried by the SU / MU indication field, AP ID field, and TXOP transmission duration field of the STA in uplink multi-user transmission need to be the same. The SU / MU indication field is used to indicate whether it is single-user transmission or multi-user transmission, so the SU / MU indication fields of the STA in uplink multi-user transmission are easily matched with each other. The AP ID field is used to indicate the information of the AP related to the next radio frame, and the STA in uplink multi-user transmission performs uplink transmission to the same AP, so the AP ID fields of the STA in uplink multi-user transmission are easily matched with each other. The TXOP transmission duration field is used to indicate the remaining duration in the current scheduling period of the AP, so that another AP or STA obtains information about the remaining duration when occupying the channel and configures NAV information. For STAs in uplink multi-user transmission, the information is consistent, but needs to be calculated according to the TXOP transmission duration indicated in the SIG part of the downlink frame and the duration of the downlink frame. Further calculations need to be made for the intermediate frame duration in the transition from the downlink frame to the uplink frame, and the preamble duration before the downlink frame and / or the uplink frame (the preamble may include two parts, i.e., the legacy preamble and the HEW preamble), depending on the circumstances.

[0218] Note that SU here means that only one station (user) performs transmission, and MU means that multiple stations (users) perform transmission simultaneously, including but not limited to methods such as MU-MIMO and OFDMA. The above figures and their descriptions are merely examples of content carried by HE-SIG-A or HE-SIG-B, and thus the specific order of the fields may be adjusted, or only some fields or some combinations of fields may be carried. [Explanation of symbols]

[0219] 10 Wireless Local Area Networks (WLANs) 20 Access Points (AP) 21 Host Processor 22 Network Interface 23 Media Access Control (MAC) 24 Physical layer (PHY) 25 Transceiver (TX / RX) 26 Antenna 30 Station (STA) 31 Host Processor 32 Network Interface 33 Media Access Control (MAC) 34 Physical layer (PHY) 35 Transceiver (TX / RX) 36 Antenna 40 L-STA 2200 Access Point (AP) 2202 Generator Unit 2203 Transmitter Unit 2204 receiving unit 2400 Station (STA) 2401 Receiver Unit 2402 Analysis Unit 2403 Reading Unit 2404 Judgment Unit 2405 Transmitter Unit 2600 Access Point (AP) 2601 Processor 2602 Transmitter 2603 Receiver 2800 Station (STA) 2801 Receiver 2802 processor 2803 Transmitter 3800 Station (STA) 3801 Generator Unit 3802 Transmitter Unit 3900 Access Point (AP) 3901 Receiver Unit 3902 Analysis Unit

Claims

1. 1. A method for transmitting wireless frames in a wireless local area network (WLAN), the method comprising: generating, by an access point (AP), a radio frame, the radio frame including a high efficiency Wi-Fi signaling field 1 (HEW-SIG1) and a high efficiency Wi-Fi signaling field 2 (HEW-SIG2) adjacent to the HEW-SIG1, the HEW-SIG1 including a frame structure indication field indicating a frame structure of the radio frame, the frame structure of the radio frame including an uplink structure or a downlink structure, the HEW-SIG1 further including a duration field, the duration field being used to indicate a remaining duration in occupying a channel by a scheduled transmission; transmitting the wireless frame by the AP; A method comprising:

2. The method of claim 1 , wherein the radio frame is for multi-user transmission.

3. The method according to claim 1 or 2, wherein the HEW-SIG2 further includes resource indication information indicating a resource position for transmitting and receiving data, and the HEW-SIG1 further includes a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field indicating a transmission MCS of the HEW-SIG2.

4. The method of claim 3, wherein the resource indication information in the HEW-SIG2 comprises resource locations for transmitting and receiving data by multiple users.

5. The method according to claim 1 , wherein the method is used in an 802.11ax system.

6. 1. A method for receiving a radio frame in a wireless local area network (WLAN), the method comprising: receiving, by a station, a radio frame, the radio frame including a high efficiency Wi-Fi signaling field 1 (HEW-SIG1) and a high efficiency Wi-Fi signaling field 2 (HEW-SIG2) adjacent to the HEW-SIG1, the HEW-SIG1 including a frame structure indication field indicating a frame structure of the radio frame, the frame structure of the radio frame including an uplink structure or a downlink structure, the HEW-SIG1 further including a duration field, the duration field being used to indicate a remaining duration in occupying a channel by a scheduled transmission; receiving, by said station, data in said radio frames according to said HEW-SIG1 and said HEW-SIG2; A method comprising:

7. The method of claim 6 , wherein the radio frame is for multi-user transmission.

8. The method according to claim 6 or 7, wherein the HEW-SIG2 further includes resource indication information indicating a resource position for transmitting and receiving data, and the HEW-SIG1 further includes a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field indicating a transmission MCS of the HEW-SIG2.

9. The method of claim 8, wherein the resource indication information in the HEW-SIG2 comprises resource locations for transmitting and receiving data by multiple users.

10. The method according to any one of claims 6 to 9, wherein the method is used in an 802.11ax system.

11. An Access Point (AP) configured to perform the method according to any one of claims 1 to 5.

12. A station configured to carry out the method according to any one of claims 6 to 10.

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