CN106533612A

CN106533612A - Method for transmitting high efficiency signal-B field, station and access point

Info

Publication number: CN106533612A
Application number: CN201510582984.3A
Authority: CN
Inventors: 刘晟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-09-14
Filing date: 2015-09-14
Publication date: 2017-03-22

Abstract

The invention discloses a method for transmitting a high efficiency signal-B field, a station and an access point. The method comprises the steps of receiving a first transmission block which is sent by the AP on a working channel and corresponds to a special segment of the HE-SIG-B (High Efficiency Signal-B field); judging whether the first transmission block is retransmitted or not; and when the first transmission block is retransmitted, determining at least one second transmission block which repeats the content of the first transmission block, wherein the first transmission block and the at least one second transmission block form a retransmitted dispatching information unit. According to the method for transmitting the HE-SIG-B, the station and he access point provided by the embodiment of the invention, the dispatched STA receives the transmission block corresponding to the special segment of the HE-SIG-B and determines whether the transmission block is retransmitted or not; and when it is determined that the transmission block is retransmitted, other transmission block for repetition is determined, thereby improving the transmission reliability of the special segment of the HE-SIG-B.

Description

Method, station and access point for transmitting high-efficiency signaling B field

Technical Field

The embodiment of the invention relates to the field of wireless local area networks, in particular to a method, a station and an access point for transmitting a high-efficiency signaling B field.

Background

In a next-generation WLAN system (e.g., High Efficiency wireless local area network (HEW)) system, an Access Point (AP) carries information such as resource allocation and transmission format of a scheduled Station (STA) through a High Efficiency signaling B field (HE-SIG-B) in an HEW preamble. The HE-SIG-B comprises a common segment of the HE-SIG-B and a dedicated segment of the HE-SIG-B. Wherein, the common segment of the HE-SIG-B is used for transmitting common information required by all scheduled STAs, and the dedicated segment of the HE-SIG-B is used for transmitting dedicated scheduling information of each scheduled STA.

When the SNR of a STA communicating with the AP is poor, the AP may not ensure reliable reception of the scheduling information unit corresponding to the STA even if the coding modulation scheme MCS0 is used to transmit the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA, so that the STA may lose its data because it cannot correctly decode its corresponding scheduling information unit in the HE-SIG-B. In addition, for a channel with a bandwidth of 20MHz, the common segment of the HE-SIG-B is not repeatedly transmitted in the frequency domain, and for an STA with a poor SNR, even if MCS0 is used to transmit the common segment of the HE-SIG-B, there is a possibility that reliable transmission of the common segment cannot be guaranteed, so that the STA may lose its data because the common segment of the HE-SIG-B cannot be correctly decoded.

Disclosure of Invention

The embodiment of the invention provides a method, a station and an access point for transmitting a high-efficiency signaling B field, which can improve the transmission reliability of a special segment of an HE-SIG-B.

In a first aspect, a method for transmitting a high efficiency signaling B field HE-SIG-B is provided, where an access point AP and a station STA in a wireless local area network WLAN applying the method communicate on an operating channel, and the method is performed by the STA and includes:

receiving a first transport block corresponding to the dedicated segment of the HE-SIG-B sent by the AP on the working channel;

judging whether the first transmission block is transmitted repeatedly;

when the first transport block is repeatedly transmitted, determining at least one second transport block that repeats the content of the first transport block, the first transport block and the at least one second transport block constituting a repeatedly transmitted scheduling information unit.

With reference to the first aspect, in an implementation manner of the first aspect, the determining whether the first transport block is repeatedly transmitted includes:

judging whether the modulation mode of the first transmission block is an orthogonal binary phase shift keying (QBPSK) modulation mode, determining that the first transmission block is transmitted repeatedly when the modulation mode of the first transmission block is the QBPSK modulation mode, and determining that the first transmission block is not transmitted repeatedly when the modulation mode of the first transmission block is not the QBPSK modulation mode.

With reference to the first aspect or any one of the above-mentioned respective implementations, in another implementation of the first aspect, before receiving a first transport block corresponding to a dedicated segment of the HE-SIG-B sent by the AP on the working channel, the method further includes:

receiving a high-efficiency signaling A field HE-SIG-A sent by the AP;

determining the bandwidth of the working channel to be 20MHz according to the HE-SIG-A;

receiving a common segment of the HE-SIG-B transmitted by the AP over the working channel;

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

when the common segment of the HE-SIG-B is repeatedly transmitted, parsing the common segment of the HE-SIG-B in a time-domain repeated manner;

the determining at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted includes:

and determining at least one second transmission block for repeating the content of the first transmission block according to a time domain repeating mode on the working channel.

With reference to the first aspect or any one of the above-mentioned corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, the determining at least one second transport block that repeats content of the first transport block when the first transport block is repeatedly transmitted, where the bandwidth of the operating channel is greater than 20MHz includes:

when the first transport block is repeatedly transmitted, determining at least one second transport block on the working channel according to a time domain repeating mode or a frequency domain repeating mode, wherein the second transport block is used for repeating the content of the first transport block.

With reference to the first aspect or any one of the foregoing corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

With reference to the first aspect or any one of the foregoing corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, a time domain resource occupied by the first transmission block or the second transmission block is an orthogonal frequency division multiplexing, OFDM, symbol length, and a frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

In a second aspect, a method for transmitting a high efficiency signaling B field HE-SIG-B is provided, in which an access point AP and a station STA in a wireless local area network WLAN applying the method communicate on an operating channel, the method is performed by the AP and includes:

judging whether the signal-to-noise power ratio SNR of the STA is smaller than a threshold value;

and when the SNR of the STA is smaller than a threshold value, transmitting a scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA on the working channel in a repeated manner.

With reference to the second aspect, in an implementation manner of the second aspect, the sending, in a repeated manner, a scheduling information unit of a dedicated segment of the HE-SIG-B corresponding to the STA on the working channel includes:

modulating a first transport block of the scheduling information unit and at least one second transport block for repeating contents of the first transport block by adopting an orthogonal binary phase shift keying (QBPSK) modulation mode on the working channel, and transmitting the first transport block and the at least one second transport block on the working channel.

With reference to the second aspect or any one of the foregoing corresponding implementations of the second aspect, in another implementation of the second aspect, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

With reference to the second aspect or any one of the foregoing corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, a bandwidth of the working channel is 20MHz, and the sending, in a repeated manner, a scheduling information unit of a dedicated segment of the HE-SIG-B corresponding to the STA on the working channel includes:

transmitting the scheduling information unit on the working channel in a time domain repetition mode;

the method further comprises the following steps:

transmitting the common segment of the HE-SIG-B in a time-domain repeating manner over the operating channel.

With reference to the second aspect or any one of the above corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, a bandwidth of the operating channel is greater than 20MHz, and the sending, in a repeated manner, a scheduling information unit of a dedicated segment of the HE-SIG-B corresponding to the STA on the operating channel includes:

and transmitting the scheduling information unit on the working channel in a time domain repetition mode and/or a frequency domain repetition mode.

With reference to the second aspect or any one of the foregoing corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, a time domain resource occupied by the first transmission block or the second transmission block is an orthogonal frequency division multiplexing, OFDM, symbol length, and a frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

In a third aspect, a station STA is provided, the STA communicating with an access point AP on an operating channel in a wireless local area network WLAN, the STA comprising:

a receiving module, configured to receive a first transport block corresponding to a dedicated segment of a high efficiency signaling B field HE-SIG-B sent by the AP on the working channel;

a judging module, configured to judge whether the first transport block received by the receiving module is repeatedly transmitted;

a processing module configured to determine at least one second transport block that repeats a content of the first transport block when the first transport block is repeatedly transmitted, the first transport block and the at least one second transport block constituting a repeatedly transmitted scheduling information unit.

With reference to the third aspect, in an implementation manner of the third aspect, the determining module is specifically configured to:

With reference to the third aspect or any one of the above corresponding implementations of the third aspect, in another implementation of the third aspect, the receiving module is further configured to:

before receiving a first transport block corresponding to a dedicated segment of the HE-SIG-B sent by the AP on the working channel, receiving a high efficiency signaling A field HE-SIG-A sent by the AP;

the processing module is further configured to:

the receiving module is further configured to:

the judging module is further configured to:

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

the processing module is further configured to:

the processing module determining at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted, comprising:

With reference to the third aspect or any one of the foregoing corresponding implementation manners of the third aspect, in another implementation manner of the third aspect, a bandwidth of the working channel is greater than 20MHz, and the processing module is specifically configured to:

With reference to the third aspect or any one of the above corresponding implementations of the third aspect, in another implementation of the third aspect, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

With reference to the third aspect or any one of the foregoing corresponding implementation manners of the third aspect, in another implementation manner of the third aspect, a time domain resource occupied by the first transmission block or the second transmission block is an orthogonal frequency division multiplexing, OFDM, symbol length, and a frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

In a fourth aspect, an access point AP is provided, the AP communicating with a station STA on an operating channel in a wireless local area network WLAN, the AP comprising:

the judging module is used for judging whether the signal-to-noise power ratio SNR of the STA is smaller than a threshold value;

a sending module, configured to send, in a repeated manner, a scheduling information unit of a dedicated segment of a high efficiency signaling B field HE-SIG-B corresponding to the STA on the working channel when the SNR of the STA is less than a threshold.

With reference to the fourth aspect, in an implementation manner of the fourth aspect, the sending module sends, in a repeated manner, a scheduling information unit of a dedicated segment of a high efficiency signaling B field HE-SIG-B corresponding to the STA on the working channel, and includes:

With reference to the fourth aspect or any one of the foregoing corresponding implementations of the fourth aspect, in another implementation of the fourth aspect, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

With reference to the fourth aspect or any one of the foregoing corresponding implementation manners of the fourth aspect, in another implementation manner of the fourth aspect, a bandwidth of the working channel is 20MHz, and the sending module sends, in a repeated manner, a scheduling information unit of a dedicated segment of a high efficiency signaling B field HE-SIG-B corresponding to the STA on the working channel, where the scheduling information unit includes:

the sending module is further configured to:

With reference to the fourth aspect or any one of the foregoing corresponding implementation manners of the fourth aspect, in another implementation manner of the fourth aspect, a bandwidth of the operating channel is greater than 20MHz, and the sending module sends, in a repeated manner, a scheduling information unit of a dedicated segment of a high efficiency signaling B field HE-SIG-B corresponding to the STA on the operating channel, where the scheduling information unit includes:

With reference to the fourth aspect or any one of the foregoing corresponding implementation manners of the fourth aspect, in another implementation manner of the fourth aspect, a time domain resource occupied by the first transmission block or the second transmission block is an orthogonal frequency division multiplexing, OFDM, symbol length, and a frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

Based on the technical features, in the method, the station and the access point for transmitting the high-efficiency signaling B field according to the embodiments of the present invention, the scheduled STA receives the transport block corresponding to the dedicated segment of the HE-SIG-B, determines whether the transport block is repeatedly transmitted, and determines other transport blocks for repetition when it is determined that the transport block is repeatedly transmitted, so that the transmission reliability of the dedicated segment of the HE-SIG-B can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a typical application scenario of a WLAN.

Fig. 2 is a schematic diagram of the physical layer packet structure of the 802.11ax protocol.

FIG. 3 is a schematic diagram of the structure of HE-SIG-B.

Fig. 4A and 4B are schematic diagrams of a scheduling information unit.

Fig. 5 is a schematic flow chart of a method of transmitting HE-SIG-B of one embodiment of the present invention.

Fig. 6 is a schematic diagram of HE-SIG-B transmission when the bandwidth of the operating channel is 20MHz according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of HE-SIG-B transmission when the bandwidth of the working channel is 80MHz according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a constellation of BPSK and QBPSK.

Fig. 9 is a schematic flow chart of a method of transmitting HE-SIG-B according to another embodiment of the present invention.

Fig. 10 is a schematic diagram of a determination procedure of the STA for the HE-SIG-B repeated transmission according to an embodiment of the present invention.

Fig. 11 is a schematic block diagram of an STA according to an embodiment of the present invention.

Fig. 12 is a schematic block diagram of an AP according to an embodiment of the present invention.

Fig. 13 is a schematic block diagram of an STA according to another embodiment of the present invention.

Fig. 14 is a schematic block diagram of an AP according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

First, a Wireless Local Area Network (WLAN) and a High Efficiency Wireless local Area Network (HEW) referred to herein will be briefly described.

Fig. 1 is a schematic diagram of a typical application scenario of a WLAN. As shown in fig. 1, the WLAN includes an Access Point (AP) and a Station (STA). The AP is responsible for bi-directional communication with multiple STAs, e.g., the AP shown in fig. 1 sends downlink data to STAs (e.g., STA1 and STA2 in fig. 1) or the AP receives uplink data from STAs (e.g., STA3 in fig. 1). It should be understood that the number of APs and STAs shown in fig. 1 is merely illustrative and that any number of APs and STAs may be included in a WLAN.

Existing WLAN standards based on Orthogonal Frequency-Division Multiplexing (OFDM) technology are composed of versions of 802.11a, 802.11n, 802.11ac, and the like, which are evolved gradually. The IEEE 802.11 standards organization has now initiated a new generation of WLAN standard called HEW, 802.11ax, for standardization. The 802.11ax standard supports Orthogonal Frequency-Division Multiple Access (OFDMA) technology. The OFDMA divides a channel into a plurality of subcarriers orthogonal to each other in a frequency domain and allocates different subcarriers to different users, thereby implementing orthogonal multiplexing transmission of the plurality of users.

Fig. 2 is a schematic diagram of the physical layer packet structure of the 802.11ax protocol. The first part of the physical layer packet structure of the 802.11ax protocol is a conventional preamble, which consists of a conventional short Training field (L-STF), a conventional Long Training field (L-LTF), and a conventional signaling field (L-SIG). The last part of the physical layer packet structure of the 802.11ax protocol is the data field. Between the legacy preamble and the data field is a preamble specifically defined by the 802.11ax protocol, i.e., HEW preamble. The HEW preamble includes Repeated Legacy signaling field (RL-SIG), High Efficiency signaling a field (HE-SIG-a), High Efficiency signaling B field (HE-SIG-B), High Efficiency Short Training field (HE-STF), and High Efficiency Long Training field (HE-LTF).

Wherein, the data field is used for transmitting data; fields such as L-SIG, RL-SIG, HE-SIG-A and HE-SIG-B are respectively used for transmitting different types of physical layer signaling; the fields of L-STF, L-LTF, HE-STF, HE-LTF and the like are mainly used for the purposes of timing, frequency synchronization, automatic gain control, channel estimation and the like of a receiving end. The OFDM symbols of the traditional preamble, RL-SIG, HE-SIG-A and HE-SIG-B adopt sub-carrier bandwidth of 312.5KHz, and for channels with bandwidths of 20MHz, 40MHz, 80MHz, 160MHz and the like, 64, 128, 256 and 512 sub-carriers are respectively corresponding. Wherein an OFDM symbol of 20MHz bandwidth comprises 48 or 52 data subcarriers for transmitting corresponding signaling information.

In the HEW preamble, the HE-SIG-B is usually included in the downlink physical layer packet and is mainly used to carry information such as resource allocation and transmission format of the scheduled STA, and the uplink physical layer packet usually does not include the HE-SIG-B. For downlink data transmission, a scheduled STA acquires whether the physical layer packet includes downlink data sent by an AP to itself, and information such as channel resources and transmission formats used for transmitting the downlink data, by receiving HE-SIG-B, so as to receive its own downlink data according to the information; for uplink data transmission, the scheduled STA receives HE-SIG-B to know whether the AP allows itself to transmit uplink data, and information such as channel resources and transmission formats used for transmitting uplink data, so as to transmit its uplink data according to the information.

FIG. 3 is a schematic diagram of the structure of HE-SIG-B. As shown in FIG. 3, the HE-SIG-B is divided into two segments, including a common segment (HE-SIGB-common) of the HE-SIG-B and a dedicated segment (HE-SIGB-dedicated) of the HE-SIG-B. The common segment of the HE-SIG-B is used to transmit Basic Service Set Identifier (BSSID), length of the HE-SIGB dedicated segment, symbol length of HE-LTF, Guard Interval (GI), and other information, which are common information that all scheduled STAs need to use. The 802.11ax standard supports channels with different bandwidths of 20MHz, 40MHz, 80MHz, 160MHz and the like, the common segment of the HE-SIG-B is the same as the traditional preamble, RL-SIG, HE-SIG-A and the like, and is coded and modulated in the channel with the 20MHz bandwidth, and the channels with the bandwidths of 40MHz, 80MHz and 160MHz are repeated on each 20MHz frequency band, namely the same content is transmitted on each 20MHz frequency band. Thus, the receiving end can combine the signals of the signaling fields on each 20MHz band, thereby improving the reliability of receiving the signaling fields.

The dedicated segment of the HE-SIG-B is used to transmit dedicated scheduling information of each scheduled STA, such as STA identifier, Resource Unit (RU) on the frequency domain allocated to the STA, Modulation and Modulation Scheme (MCS), and number of spatial streams. These information are specific to the STAs, i.e., each scheduled STA only needs to receive transmission control information belonging to itself in the dedicated segment of HE-SIG-B, and does not need to receive transmission control information of other scheduled STAs. The special segment of the HE-SIG-B consists of a plurality of scheduling information units, each scheduled STA has a corresponding scheduling information unit in the special segment of the HE-SIG-B, and each scheduling information unit can transmit special scheduling information of one STA or transmit special scheduling information of a plurality of STAs. Thus, each scheduled STA only needs to receive the scheduling information unit belonging to itself in the dedicated segment of the HE-SIG-B, and does not need to receive other scheduling information units.

Each scheduling information unit is an independent coded modulation unit. For the information bits in each scheduling information unit, Cyclic Redundancy Check (CRC) bits are first generated, and then channel coding and modulation are performed by using a certain MCS, where the CRC bits are used by a receiving end to determine whether the information bits in the scheduling information unit have been correctly received. Typically, one scheduling information unit is coded and modulated within a channel of 20MHz bandwidth for a time length of 1 or 2 OFDM symbols, as shown in fig. 4A and 4B. For example, if the dedicated scheduling information for each STA includes 24 uncoded bits (including CRC), the transmission may be performed using MCS number 0 (i.e., MCS0), i.e., using convolutional coding with a coding rate of 1/2 to generate 48 coded bits, then using Binary Phase Shift Keying (BPSK) modulation to generate 48 modulation symbols, and transmitting the 48 modulation symbols by 48 data subcarriers within a 20MHz bandwidth of 1 OFDM symbol, with a time length of 1 OFDM symbol. As shown in fig. 4A, the scheduling information unit may transmit dedicated scheduling information of only one STA at this time. If MCS number 1 (i.e., MCS1) is used for transmission, since MCS1 may transmit a total of 48 uncoded bits (including CRC) using convolutional coding with a coding rate of 1/2 and Quadrature Phase Shift Keying (QPSK) modulation, one scheduling information unit may transmit dedicated scheduling information for 2 STAs at the same time, with a time length of still 1 OFDM symbol, as shown in fig. 4A. If one schedule information unit transmits the dedicated schedule information of 2 STAs simultaneously for 48 uncoded bits (including CRC) but still using MCS0 for transmission, it needs to be transmitted by 48 data subcarriers within a 20MHz bandwidth of 2 OFDM symbols for a length of 2 OFDM symbols, as shown in fig. 4B.

It should be understood that each scheduling information unit may include at least one transport block, and typically the scheduling information unit is transmitted in a non-repetitive manner, i.e. one scheduling information unit corresponds to one transport block. When the scheduling information unit is transmitted in an m-fold repeated manner, the repeated scheduling information unit corresponds to m transport blocks, and each transport block transmits the same scheduling information. When receiving the special segment of the HE-SIG-B, the STA receives all the transmission blocks by taking the transmission blocks as units, namely all the scheduling information units, and then analyzes the scheduling information units to find the corresponding scheduling information units. A transport block may also be referred to as a transport unit or control block.

In order to ensure that each scheduled STA can reliably receive the corresponding scheduling information units in the common segment of HE-SIG-B and the dedicated segment of HE-SIG-B, the Packet Error Rate (PER) of each scheduled STA receiving these two portions should be generally less than 1%. In contrast, the PER of the data field typically does not exceed 10%. For this, the common segment of the HE-SIG-B in the related art is transmitted using MCS0, and the scheduling information element uses a lower order MCS than the uplink and downlink data transmissions of the STA. Table 1 shows a MCS list commonly used in the WLAN, and as the MCS number increases, the MCS goes from a lower order to a higher order, the higher the transmission data rate, but the higher the Signal to Noise Ratio (SNR) required for reception. Thus, if the AP transmits downlink data to a specific station STA1 using MCS3, the scheduling information element corresponding to STA1 is transmitted using at least a lower order MCS than MCS3, e.g., MCS 1.

TABLE 1 MCS commonly used in WLANs

MCS sequence number

Modulation system

Coding rate

0	BPSK	1/2
			1	QPSK	1/2
2	QPSK	3/4
			3	16QAM	1/2
4	16QAM	3/4
			5	64QAM	2/3
6	64QAM	3/4
			7	64QAM	5/6
8	256QAM	3/4
			9	256QAM	5/6

However, in some cases, the SNR of a STA communicating with the AP is poor, so that even if MCS0 is used to transmit the scheduling information unit of the dedicated segment of HE-SIG-B corresponding to the STA, reliable transmission of the scheduling information unit corresponding to the STA cannot be guaranteed, thereby causing the STA to possibly lose its data because it cannot correctly decode its corresponding scheduling information unit in HE-SIG-B. In addition, for a channel with a bandwidth of 20MHz, the common segment of the HE-SIG-B is not repeatedly transmitted in the frequency domain, and for an STA with a poor SNR, even if MCS0 is used to transmit the common segment of the HE-SIG-B, there is a possibility that reliable transmission of the common segment cannot be guaranteed, so that the STA may lose its data because the common segment of the HE-SIG-B cannot be correctly decoded.

The present invention has been made to solve the above problems.

Fig. 5 is a schematic flow chart of a method 100 of transmitting HE-SIG-B in one embodiment of the invention. An access point AP and a station STA in a wireless local area network WLAN applying the method 100 communicate on an operating channel, the method 100 being performed by the AP and comprising:

s110, determining whether the signal-to-noise power ratio SNR of the STA is less than a threshold value;

and S120, when the SNR of the STA is smaller than the threshold value, repeatedly transmitting the scheduling information unit of the special segment of the HE-SIG-B corresponding to the STA on the working channel.

The threshold is determined by a PER performance curve when the scheduling information unit is transmitted using MCS0, for example, the threshold is selected as an SNR value corresponding to a PER of 1%, so that when the SNR of the STA is greater than the threshold, the requirement for reliable transmission of the scheduling information unit can be met using MCS0, and therefore, repeated transmission is not needed, but when the SNR of the STA is less than the threshold, the PER exceeds 1%, that is, the requirement for reliable transmission of the scheduling information unit cannot be met, and therefore, repeated transmission is needed. When the SNR of the STA is equal to the threshold, the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA may be repeatedly transmitted, or may not be repeatedly transmitted, and whether to repeatedly transmit may be determined according to experience, specific conditions of method implementation, or a size selected by the threshold, which is not limited in the embodiment of the present invention.

Therefore, in the method for transmitting the HE-SIG-B according to the embodiment of the present invention, when there is an STA with an SNR smaller than the threshold among the scheduled STAs, the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA with the SNR smaller than the threshold cannot be reliably received, and the scheduling information unit is repeatedly transmitted, so that the transmission reliability of the dedicated segment of the HE-SIG-B can be improved.

Optionally, as an embodiment, the bandwidth of the working channel is 20MHz, and the S120 repeatedly sends the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA on the working channel, including:

the method 100 further comprises:

the common segment of the HE-SIG-B is transmitted in a time-domain repeating manner over the operating channel.

Specifically, for an operating channel with a bandwidth of 20MHz, when the AP schedules STAs with SNR smaller than the threshold for downlink data transmission and/or uplink data transmission, a lower order MCS (typically MCS0) needs to be used for transmission to ensure reliability of data transmission. Correspondingly, in order to ensure the reliability of transmission of the scheduling information unit corresponding to the STA in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B of the physical layer packet, the scheduling information unit corresponding to the STA in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B is transmitted in a time-domain repetition mode. Wherein, the repetition multiple m is greater than or equal to 2, and preferably, the repetition multiple m is equal to 2 to ensure the reliability of transmission.

It should be understood that the repetition multiple m may be set by a standard, for example, m may be fixedly selected to be 2 in the standard. The repetition multiple m may also be indicated with 1 or 2 bits in the HE-SIG-a. The following may be set in the standard. For example, when the bandwidth of the working channel is 20MHz, the repeated transmission of the scheduling information units in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B occurs continuously in a time domain repetition manner; when the bandwidth of the working channel is greater than 20MHz, the repeated transmission of the scheduling information unit in the dedicated segment of the HE-SIG-B may be in a time-domain repeated manner (occurring continuously, i.e., repeatedly transmitting the transport block in the time domain), a frequency-domain repeated manner (m occupied 20MHz frequency bands have a specific relationship specified by the standard, i.e., repeatedly transmitting the transport block in the frequency domain), and so on.

Fig. 6 is a schematic diagram of an HE-SIG-B transmitted over an operating channel with a bandwidth of 20MHz according to an embodiment of the present invention. For the case that the bandwidth of the working channel is 20MHz, if the common field of the HE-SIG-B adopts repeated transmission, it means that at least one scheduling information unit transmitted in a repeated manner is in the dedicated segment of the HE-SIG-B.

It should be noted that the embodiment of the present invention does not limit the repetition manner used by the common field and the scheduling information unit of the HE-SIG-B. For example, a direct repetition m times mode may be adopted, that is, a signal modulated by a common field or a scheduling information unit of the HE-SIG-B is transmitted m times; the information may also be repeatedly transmitted on different transport blocks by using different mapping manners of modulation symbols and data subcarriers, that is, repeatedly transmitted in a manner that the content (the transmitted information, i.e., the common field or the scheduling information unit of the HE-SIG-B) is the same but the transmission signal is different. For example, if the dedicated scheduling information of the STA includes 24 uncoded bits (including CRC), 48 modulation symbols are generated after coded modulation by using MCS0, and are transmitted by 48 data subcarriers (e.g., the first transport block) of 1 OFDM symbol, the repeated signal also includes 1 OFDM symbol, and the 48 data subcarriers also transmit the 48 modulation symbols (e.g., the second transport block), but the mapping manner of the 48 modulation symbols is different from that of the 48 data subcarriers, and compared with direct repetition, such an advantage is that a frequency diversity gain can be obtained.

Accordingly, the first transport block and the second transport block are repeated on the transport block by adopting different mapping modes of modulation symbols and data subcarriers.

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and the S120 repeatedly transmits the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA on the working channel, including:

the scheduling information unit is transmitted in a time-domain repetition manner and/or in a frequency-domain repetition manner on the operating channel.

Specifically, for the working channels with larger bandwidths of 40MHz, 80MHz, 160MHz, etc., when the AP schedules the STA with SNR smaller than the threshold to perform downlink data transmission and/or uplink data transmission, the downlink data transmission and/or uplink data transmission of the STA needs to be transmitted by using a lower-order MCS (typically, MCS0) to ensure reliability of data transmission. Correspondingly, the scheduling information unit corresponding to the STA in the special segment of the HE-SIG-B of the physical layer packet is transmitted in a repeated mode on a time domain or a frequency domain, wherein the repetition multiple m is more than or equal to 2. Wherein, the repetition multiple m is greater than or equal to 2, and preferably, the repetition multiple m is equal to 2 to ensure the reliability of transmission.

It should be noted that the embodiment of the present invention does not limit the repetition manner used by the scheduling information unit. For example, if the scheduling information unit is transmitted in a time domain repetition mode on the working channel, the scheduling information unit may be transmitted in a direct repetition mode, or may be repeatedly transmitted in a mapping mode of different modulation symbols and data subcarriers; if the scheduling information unit is transmitted in a frequency-domain repeating manner on the operating channel, the scheduling information unit may be directly repeated (i.e., transmit the same signal) on a plurality of different 20MHz frequency bands, and a frequency diversity gain may be obtained.

Fig. 7 is a schematic diagram of HE-SIG-B transmitted over an operating channel with a bandwidth of 80MHz according to an embodiment of the present invention. As shown in fig. 7, in a specific example, the bandwidth of the operating channel is 80MHz, and the SNRs of the STAs corresponding to the scheduling information unit 1 and the scheduling information unit 2 are less than the threshold. When the STAs corresponding to the scheduling information element 1 and the scheduling information element 2 perform downlink data transmission and/or uplink data transmission, a lower MCS (typically MCS0) needs to be used for transmission to ensure the reliability of data transmission. In order to ensure reliable reception of their respective corresponding scheduling information units 1 and 2, the scheduling information units 1 are transmitted in a time-domain repetitive manner (repeated in the time domain with two transport blocks) and the scheduling information units 2 are transmitted in a frequency-domain repetitive manner (repeated in the frequency domain with two transport blocks).

It should be understood that, when the repetition multiple m is greater than 2 in the embodiment of the present invention, the scheduling information unit may be transmitted in a time domain repetition manner and a frequency domain repetition manner, which is not limited in the embodiment of the present invention.

It should also be understood that, in the embodiment of the present invention, the time domain repetition mode may preferably be a mode of continuously repeating in the time domain, that is, a mode of continuously repeating OFDM symbols. As shown in fig. 7, the scheduling information unit 1 is transmitted in a manner of 2 times repetition in the time domain, and occupies the time length of 2 consecutive transmission blocks (corresponding to 2 non-repeated scheduling information units) in the time domain. The frequency domain repeating manner is such that m 20MHz frequency bands occupied by the repeatedly transmitted scheduling information elements have a certain relationship. That is, once a STA determines the first 20MHz band occupied by repeatedly transmitted scheduling information, it knows the locations of the other 20MHz bands it occupies. As shown in fig. 7, the scheduling information unit 2 is transmitted in a 2-fold repetition manner in the frequency domain, two transmission blocks are occupied in the frequency domain, and the relationship between the occupied 220 MHz frequency bands is specific. For example, each 20MHz band of an 80MHz channel is numbered 1, 2, 3, and 4 in sequence, and a scheduling information unit transmitted in a frequency domain repeating manner always appears in the 1 st and 2 nd, 2 nd and 3 rd, 3 rd and 4 th, or 4 th and 1 st 20MHz bands.

In the embodiment of the invention, when the AP transmits the scheduling information units of the common segment of the HE-SIG-B or the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel, the AP shall notify the corresponding scheduled STA whether some scheduling information units in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B are transmitted in a time domain repeated manner and/or a frequency domain repeated manner, so that the scheduled STA can perform corresponding receiving processing.

In the embodiment of the present invention, the AP may add a certain number of signaling bits in an explicit manner, that is, in a common segment of the HE-SIG-a or the HE-SIG-B, to indicate whether the common segment of the HE-SIG-B is repeated, which scheduling information units in a dedicated segment of the HE-SIG-B are repeated (including whether the scheduling information units are repeated in a time domain or a frequency domain, etc.). On one hand, however, when there are more scheduling information units transmitted in a repetition manner, the explicit signaling manner will cause a larger signaling overhead; on the other hand, in the current standardization process, whether the HE-SIG-a or the common segment of the HE-SIG-B is short (typically only one OFDM symbol long), the number of signaling bits that can be transmitted is very limited, and therefore, it is difficult to effectively implement the AP to notify the corresponding scheduled STA in an explicit signaling manner.

To this end, in embodiment S120 of the present invention, the repeatedly sending the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA on the working channel may include: modulating a first transport block of the scheduling information unit and at least one second transport block for repeating contents of the first transport block by using a Quadrature Binary Phase Shift Keying (QBPSK) modulation scheme on the working channel, and transmitting the first transport block and the at least one second transport block on the working channel.

Specifically, the common segment of HE-SIG-B is typically transmitted using MCS 0. For the dedicated segment of HE-SIG-B, when there is an STA whose SNR is smaller than the threshold among the scheduled STAs, reliable reception of the scheduling information unit corresponding to the STA by the STA cannot be guaranteed even by using MCS0, and therefore, transmission needs to be performed in a repeated manner. Therefore, the scheduling information unit transmitted in the repetition mode is modulation-coded by MCS0, and the modulation mode is unlikely to be QPSK or even higher. Therefore, in the embodiment of the invention, QBPSK modulation is adopted for scheduling information units in the common segment of the HE-SIG-B transmitted in a repeated mode and the special segment of the HE-SIG-B transmitted in a repeated mode. That is, when the scheduling information unit is repeated, it includes at least two transport blocks, for example, a first transport block and a second transport block, and both the first transport block and the second transport block are modulated by using the QBPSK modulation scheme.

Fig. 8 shows a schematic diagram of constellations of Binary Phase Shift Keying (BPSK) and QBPSK. In the example shown in fig. 8, QBPSK and BPSK have the same modulation order, and both transmit 1-bit information in one modulation symbol. The constellation points of the BPSK modulated signal are distributed only on the I branch (In-phase), and the signal on the Q branch (Quadrature) is zero. The constellation diagram of QBPSK is rotated by 90 degrees, the constellation points of the modulated signal are distributed on the Q branch only, and the signal on the I branch is zero. In the embodiment of the invention, QBPSK is adopted to modulate a transmission block (namely a data subcarrier of an OFDM symbol) corresponding to a scheduling information unit in a repeatedly transmitted common segment of the HE-SIG-B and a repeatedly transmitted special segment of the HE-SIG-B. Therefore, the STA can determine whether to repeat transmission by determining whether the signal carried by the transmission block is QBPSK-modulated signal by using the feature that the QBPSK constellation is rotated by 90 degrees, so as to perform corresponding receiving processing.

Therefore, the method for transmitting the HE-SIG-B according to the embodiment of the present invention selectively transmits the scheduling information units in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B in a time domain repetition or frequency domain repetition manner for channel conditions with different bandwidths, where the selectivity refers to performing repeated transmission specifically when there are STAs with SNR less than the threshold among the scheduled STAs, and when reliable reception cannot be guaranteed even by using MCS0, the scheduling information units corresponding to the common segment of the HE-SIG-B (only 20MHz bandwidth) and the STAs with SNR less than the threshold cannot be guaranteed, so that the transmission reliability of the HE-SIG-B can be improved.

The method of transmitting HE-SIG-B according to the embodiment of the present invention is described in detail above from the perspective of the AP, and is described below from the perspective of the STA.

Fig. 9 is a schematic flow chart diagram of a method 200 of transmitting HE-SIG-B in accordance with another embodiment of the invention. An access point AP and a station STA in a wireless local area network WLAN applying the method 200 communicate on an operating channel, the method 200 is performed by the STA and includes:

s210, receiving a first transport block corresponding to the dedicated segment of the HE-SIG-B sent by the AP on the working channel;

s220, judging whether the first transmission block is repeatedly transmitted or not;

s230, when the first transport block is repeatedly transmitted, determining at least one second transport block that repeats the content of the first transport block, the first transport block and the at least one second transport block constituting a repeatedly transmitted scheduling information unit.

Therefore, in the method for transmitting HE-SIG-B according to the embodiment of the present invention, the scheduled STA receives the transport block corresponding to the dedicated segment of HE-SIG-B, determines whether the transport block is repeatedly transmitted, and determines another transport block for repetition when it is determined that the transport block is repeatedly transmitted, thereby improving the transmission reliability of the dedicated segment of HE-SIG-B.

Specifically, the AP may add a certain number of signaling bits in an explicit manner, that is, in the common segment of the HE-SIG-a or the HE-SIG-B, to indicate whether the common segment of the HE-SIG-B is repeated, which scheduling information units are repeated in the dedicated segment of the HE-SIG-B (including whether the scheduling information units are repeated in the time domain or the frequency domain, etc.). The STA determines whether the common segment or the scheduling information unit of the HE-SIG-B is repeatedly transmitted according to the signaling bits.

Preferably, the determining of whether the first transport block is repeatedly transmitted S220 may include:

judging whether the modulation mode of the first transmission block is an orthogonal binary phase shift keying (QBPSK) modulation mode, determining that the first transmission block is repeatedly transmitted when the modulation mode of the first transmission block is the QBPSK modulation mode, and determining that the first transmission block is not repeatedly transmitted when the modulation mode of the first transmission block is not the QBPSK modulation mode.

Specifically, 48 or 52 data subcarriers may be included in one OFDM symbol of each transport block of the HE-SIG-B, and the STA first compares the total energy of the I and Q branches of the received signal on all the data subcarriers of each transport block of the HE-SIG-B. Considering the influence of the received noise, for the BPSK modulation signal, the total energy of the signal I branch on all the data subcarriers is far greater than that of the signal Q branch; for modulation signals such as QPSK, 16QAM and 64QAM, the total energy of the I branch and the total energy of the Q branch of the signal on all data subcarriers are close to each other due to the even distribution of the constellation; for the QBPSK modulation signal, the total energy of the Q branch of the signal on all the data subcarriers is far greater than that of the I branch. QAM is Quadrature Amplitude Modulation (Quadrature Amplitude Modulation).

Therefore, for each transmission block, the difference between the total energy of the Q branch and the total energy of the I branch of the signal on all the data subcarriers of 1 OFDM symbol may be used as a decision quantity, and compared with a set threshold, so as to determine whether the signal on the data subcarrier of the transmission block is a QBPSK modulated signal. Particularly, for the scheduling information units in the common segment of the HE-SIG-B and the dedicated segment of the HE-SIG-B, if the length of the scheduling information units is 2 or more than 2 OFDM symbols, the difference between the total energy of the Q branch and the total energy of the I branch of the signal on all data subcarriers of all OFDM symbols can be further used as a decision quantity, so that the accuracy of the judgment is further improved.

It should be understood that different modulation symbols and data sub-carriers mapping manners are used for repeating on different transport blocks (for example, the first transport block and the second transport block) on the transport block, or may be directly repeated, which is not limited in this embodiment of the present invention. Preferably, the time domain resource occupied by the first transmission block or the second transmission block is one OFDM symbol length, and the frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

Optionally, as an embodiment, before receiving, at S210, a first transport block corresponding to the dedicated segment of the HE-SIG-B sent by the AP on the working channel, the method 200 further includes:

receiving a high-efficiency signaling A field HE-SIG-A sent by the AP;

receiving the common segment of the HE-SIG-B transmitted by the AP on the working channel;

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

when the common segment of the HE-SIG-B is repeatedly transmitted, resolving the common segment of the HE-SIG-B in a time domain repeated manner;

s230, when the first transport block is repeatedly transmitted, determining at least one second transport block that repeats the content of the first transport block, including:

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and when the first transport block is repeatedly transmitted, the determining at least one second transport block that repeats the content of the first transport block in S230 includes:

when the first transport block is repeatedly transmitted, at least one second transport block that repeats the content of the first transport block is determined on the operating channel according to a time-domain repeating manner or according to a frequency-domain repeating manner.

Optionally, in this embodiment of the present invention, a time domain resource occupied by the first transmission block or the second transmission block is an OFDM symbol length, and a frequency domain resource occupied by the first transmission block or the second transmission block is 20 MHz.

Fig. 10 is a diagram illustrating a determination flow of the STA repeating transmission to the HE-SIG-B. In a specific example, a decision flow 300 for the STA to repeat transmission of the HE-SIG-B is described below with reference to fig. 10.

And S310, determining the bandwidth of the working channel according to the HE-SIG-A. In the prior art, the HE-SIG-a carries indication information of the bandwidth of the working channel, so that the bandwidth of the working channel of the STA can be determined according to the HE-SIG-a.

And S320, when the bandwidth of the working channel is 20MHz, judging the modulation mode of the signal on the data subcarrier of the OFDM symbol in the common field length of the HE-SIG-B. For example, the difference between the total energy of the Q branch and the total energy of the I branch of the signals on all data subcarriers is used as a decision amount to compare with a set threshold. And if the physical layer packet is judged to be QBPSK modulated, the common field of the HE-SIG-B of the physical layer packet adopts a repeated transmission mode, so that corresponding receiving processing is carried out. For example, an OFDM symbol with a length of 1 in the common field of the HE-SIG-B is determined, and if the modulation scheme of the signal on the data subcarrier on the OFDM symbol is determined to be QBPSK modulation, the common field of the HE-SIG-B is transmitted by using a repetition side, that is, the 2 nd OFDM symbol after the OFDM symbol also belongs to the common field of the HE-SIG-B, and the STA may perform corresponding receiving processing on the repeatedly transmitted common field of the HE-SIG-B.

For the condition that the bandwidth of the working channel is 20MHz, if the repeated transmission is adopted for the public field of the HE-SIG-B, at least one scheduling information unit adopting the repeated transmission is adopted in the special segment of the HE-SIG-B, therefore, if the repeated transmission is adopted for the public field of the HE-SIG-B, whether the repeated transmission is adopted for the scheduling information unit in the special segment of the HE-SIG-B is judged, and if not, whether the repeated transmission is adopted for the scheduling information unit in the special segment of the HE-SIG-B is not required to be judged.

And S330, judging the signal modulation mode on the data subcarrier of each transmission block of the special segment of the HE-SIG-B by taking each transmission block as a unit. If the transmission block is judged to be QBPSK modulated, the signal modulation mode on the data subcarrier of the next transmission block on the 20MHz frequency band where the transmission block is located is further judged, if the transmission block is judged to be QBPSK modulated, the scheduling information unit is transmitted in a time domain repetition mode, otherwise, the scheduling information unit is not transmitted repeatedly.

S340, when the bandwidth of the working channel is more than 20MHz, the signal modulation mode on the data subcarrier of each transmission block is judged for the special segment of the HE-SIG-B. If the transmission block is judged to be QBPSK modulated, the signal modulation mode of the transmission block corresponding to the data subcarrier of the transmission block on other 20MHz frequency bands is further judged, and if the transmission block is judged to be QBPSK modulated, the scheduling information unit is transmitted in a frequency domain repetition mode; otherwise, S350 is performed.

S350, further determining a signal modulation mode on a data subcarrier of a next transmission block in the 20MHz band where the transmission block is located, if the transmission block is determined to be QBPSK modulated, transmitting the scheduling information unit in a time-domain repeating mode, otherwise, transmitting the scheduling information unit without repeating.

It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present invention.

The method of transmitting the HE-SIG-B according to the embodiment of the present invention is described in detail above with reference to fig. 5 to 10, and the STA and the AP according to the embodiment of the present invention will be described below with reference to fig. 11 and 14.

Fig. 11 shows an STA400 according to an embodiment of the present invention. The STA400 communicates with the AP over an operating channel in the WLAN, as shown in fig. 11, the STA400 includes:

a receiving module 410, configured to receive a first transport block corresponding to a dedicated segment of a high efficiency signaling B field HE-SIG-B sent by the AP on the working channel;

a determining module 420, configured to determine whether the first transport block received by the receiving module 410 is repeatedly transmitted;

a processing module 430, configured to determine at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted, where the first transport block and the at least one second transport block constitute a repeatedly transmitted scheduling information unit.

Therefore, the STA according to the embodiment of the present invention receives a transport block corresponding to the dedicated segment of the HE-SIG-B, determines whether the transport block is repeatedly transmitted, and determines other transport blocks for repetition when it is determined that the transport block is repeatedly transmitted, thereby improving the transmission reliability of the dedicated segment of the HE-SIG-B.

Optionally, as an embodiment, the determining module 420 is specifically configured to:

Optionally, as an embodiment, the receiving module 410 is further configured to:

before receiving a first transport block corresponding to the special segment of the HE-SIG-B transmitted by the AP on the working channel, receiving a high efficiency signaling A field HE-SIG-A transmitted by the AP;

the processing module 430 is further configured to:

the receiving module 410 is further configured to:

the determining module 420 is further configured to:

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

the processing module 430 is further configured to:

the processing module 430 determines at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted, including:

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and the processing module 430 is specifically configured to:

Optionally, in this embodiment of the present invention, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

It should be understood that the STA400 according to the embodiment of the present invention may correspond to an execution body in the embodiment of the method of the present invention, and the above and other operations and/or functions of each module in the STA400 are respectively for implementing corresponding flows of each method in fig. 5 to fig. 10, and are not described herein again for brevity.

Fig. 12 shows an AP 500 according to an embodiment of the invention. The AP 500 communicates with STAs on an operating channel in a WLAN, as shown in fig. 12, and the AP 500 includes:

a determining module 510, configured to determine whether a signal-to-noise power ratio SNR of the STA is smaller than a threshold;

a transmitting module 520, configured to transmit, in a repeated manner, a scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA on the working channel when the SNR of the STA is less than the threshold.

Therefore, in the AP according to the embodiment of the present invention, when there is an STA with an SNR less than the threshold among the scheduled STAs, the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA with the SNR less than the threshold cannot be reliably received, and the AP repeatedly transmits the scheduling information unit, so that the transmission reliability of the dedicated segment of the HE-SIG-B can be improved.

Optionally, as an embodiment, the sending module 520 sends, in a repeated manner, the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA on the working channel, where the scheduled information unit includes:

modulating a first transport block of the scheduling information unit and at least one second transport block for repeating the contents of the first transport block by using an orthogonal binary phase shift keying (QBPSK) modulation scheme on the working channel, and transmitting the first transport block and the at least one second transport block on the working channel.

Optionally, as an embodiment, the bandwidth of the working channel is 20MHz, and the sending module 520 sends the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA in a repeated manner on the working channel, where the scheduling information unit includes:

the sending module 520 is further configured to:

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and the sending module 520 sends the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA in a repeated manner on the working channel, where the scheduling information unit includes:

It should be understood that the AP 500 according to the embodiment of the present invention may correspond to an execution subject in the method embodiment of the present invention, and the above and other operations and/or functions of each module in the AP 500 are respectively for implementing corresponding flows of each method in fig. 5 to fig. 10, and are not described herein again for brevity.

As shown in fig. 13, an embodiment of the present invention further provides an STA 600, where the STA 600 communicates with an AP on an operating channel in a WLAN, and includes: a processor 610, a memory 620, a bus system 630, and a transceiver 640. The processor 610, the memory 620 and the transceiver 640 are connected through the bus system 630, the memory 620 is used for storing instructions, and the processor 610 is used for executing the instructions stored in the memory 620 to control the transceiver 640 to transmit or receive signals; wherein,

the transceiver 640 is used for: receiving a first transmission block corresponding to the special segment of the HE-SIG-B sent by the AP on the working channel;

the processor 610 is configured to:

judging whether the first transmission block is transmitted repeatedly;

when the first transport block is repeatedly transmitted, at least one second transport block that repeats the contents of the first transport block is determined, the first transport block and the at least one second transport block constituting a repeatedly transmitted scheduling information unit.

It should be understood that, in the embodiment of the present invention, the processor 610 may be a Central Processing Unit (CPU), and the processor 610 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 620 may include both read-only memory and random access memory, and provides instructions and data to the processor 610. A portion of the memory 620 may also include non-volatile random access memory. For example, the memory 620 may also store device type information.

The bus system 630 may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 630.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 610. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 620, and the processor 610 reads the information in the memory 620 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

Optionally, as an embodiment, the determining, by the processor 610, whether the first transport block is repeatedly transmitted includes:

Optionally, as an embodiment, before receiving the first transmission block corresponding to the dedicated segment of the HE-SIG-B transmitted by the AP on the working channel, the transceiver 640 is further configured to:

receiving a high-efficiency signaling A field HE-SIG-A sent by the AP;

the processor 610 is further configured to:

the transceiver 640 is also for:

the processor 610 is further configured to:

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

the processor 610, when the first transport block is repeatedly transmitted, determines at least one second transport block that repeats the content of the first transport block, including:

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and the processor 610 determines at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted, including:

Optionally, as an embodiment, the first transport block and the second transport block are repeated on the transport block by using different mapping manners of modulation symbols and data subcarriers.

Optionally, as an embodiment, a time domain resource occupied by the first transport block or the second transport block is an orthogonal frequency division multiplexing, OFDM, symbol length, and a frequency domain resource occupied by the first transport block or the second transport block is 20 MHz.

It should be understood that the STA 600 according to the embodiment of the present invention may correspond to the STA400 in the embodiment of the present invention, and may correspond to a corresponding main body in executing the method according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the STA 600 are respectively for implementing corresponding flows of each method in fig. 5 to fig. 10, and are not described herein again for brevity.

As shown in fig. 14, an embodiment of the present invention further provides an AP 700, where the AP 700 communicates with STAs in a WLAN on an operating channel, and includes: a processor 710, a memory 720, a bus system 730, and a transceiver 740. The processor 710, the memory 720 and the transceiver 740 are connected via the bus system 730, the memory 720 is used for storing instructions, and the processor 710 is used for executing the instructions stored in the memory 720 to control the transceiver 740 to transmit or receive signals; wherein,

the processor 710 is configured to:

the transceiver 740 is configured to:

and when the SNR of the STA is smaller than the threshold value, transmitting the scheduling information unit of the special segment of the HE-SIG-B corresponding to the STA in a repeated mode on the working channel.

It should be understood that, in the embodiment of the present invention, the processor 710 may be a Central Processing Unit (CPU), and the processor 710 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 720 may include both read-only memory and random-access memory, and provides instructions and data to the processor 710. A portion of memory 720 may also include non-volatile random access memory. For example, memory 720 may also store device type information.

The bus system 730 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 730.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 710. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 720, and the processor 710 reads the information in the memory 720 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

Optionally, as an embodiment, the transceiver 740 transmits the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel, including:

Optionally, as an embodiment, the bandwidth of the working channel is 20MHz, and the transceiver 740 sends the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel, including:

the transceiver 740 is further configured to:

Optionally, as an embodiment, the bandwidth of the working channel is greater than 20MHz, and the transceiver 740 transmits the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel, including:

It should be understood that the AP 700 according to the embodiment of the present invention may correspond to the AP 500 in the embodiment of the present invention, and may correspond to a corresponding main body in executing the method according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the AP 700 are respectively for implementing corresponding flows of each method in fig. 5 to fig. 10, and are not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of transmitting a high efficiency signaling B field (HE-SIG-B) in a Wireless Local Area Network (WLAN) in which the method is applied, wherein an Access Point (AP) and a Station (STA) communicate on an operating channel, the method being performed by the STA, comprising:

judging whether the first transmission block is transmitted repeatedly;

2. The method of claim 1, wherein the determining whether the first transport block is repeatedly transmitted comprises:

3. The method of claim 1 or 2, wherein prior to receiving a first transport block corresponding to the dedicated segment of the HE-SIG-B transmitted by the AP on the working channel, the method further comprises:

receiving a high-efficiency signaling A field HE-SIG-A sent by the AP;

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

4. The method of claim 1 or 2, wherein the bandwidth of the operating channel is greater than 20MHz, and wherein determining at least one second transport block that repeats the content of the first transport block when the first transport block is repeatedly transmitted comprises:

5. The method according to any of claims 1 to 4, wherein the first transport block and the second transport block are repeated on a transport block using different mapping of modulation symbols to data subcarriers.

6. The method according to any of claims 1 to 5, wherein the time domain resource occupied by the first transmission block or the second transmission block is one OFDM symbol length, and the frequency domain resource occupied by the first transmission block is 20 MHz.

7. A method of transmitting a high efficiency signaling B field (HE-SIG-B) in a Wireless Local Area Network (WLAN) in which an Access Point (AP) and a Station (STA) communicate on an operating channel, the method performed by the AP, comprising:

8. The method of claim 7, wherein the transmitting the scheduling information element of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel comprises:

9. The method of claim 8, wherein the first transport block and the second transport block are repeated on a transport block using different mapping of modulation symbols and data subcarriers.

10. The method according to any one of claims 7 to 9, wherein the bandwidth of the working channel is 20MHz, and the transmitting the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel comprises:

the method further comprises the following steps:

11. The method according to any one of claims 7 to 9, wherein a bandwidth of the working channel is greater than 20MHz, and wherein the transmitting the scheduling information unit of the dedicated segment of the HE-SIG-B corresponding to the STA in a repeated manner on the working channel comprises:

12. The method according to claim 8 or 9, wherein the time domain resource occupied by the first transmission block or the second transmission block is one OFDM symbol length, and the frequency domain resource occupied by the first transmission block is 20 MHz.

13. A Station (STA) that communicates with an Access Point (AP) on an operating channel in a Wireless Local Area Network (WLAN), comprising:

14. The STA of claim 13, wherein the determining module is specifically configured to:

15. The STA of claim 13 or 14, wherein the receiving module is further configured to:

the processing module is further configured to:

the receiving module is further configured to:

the judging module is further configured to:

judging whether the common segment of the HE-SIG-B is transmitted repeatedly;

the processing module is further configured to:

16. The STA of claim 13 or 14, wherein the bandwidth of the working channel is greater than 20MHz, and wherein the processing module is specifically configured to:

17. The STA of any one of claims 13-16, wherein the first transport block and the second transport block are repeated on a transport block using different modulation symbol to data subcarrier mappings.

18. The STA of any one of claims 13 to 17, wherein the time domain resource occupied by the first transport block or the second transport block is one OFDM symbol length, and the frequency domain resource occupied by the first transport block is 20 MHz.

19. An access point, AP, in a wireless local area network, WLAN, to communicate with a station, STA, over an operating channel, the AP comprising:

20. The AP of claim 19, wherein the transmitting module transmits the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA in a repeated manner on the working channel, and wherein the transmitting module comprises:

21. The AP of claim 20, wherein the first transport block and the second transport block are repeated on a transport block using different mapping of modulation symbols and data subcarriers.

22. The AP of any one of claims 19 to 21, wherein the bandwidth of the working channel is 20MHz, and the sending module sends the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA in a repeated manner on the working channel, including:

the sending module is further configured to:

23. The AP of any one of claims 19 to 21, wherein the bandwidth of the working channel is greater than 20MHz, and wherein the sending module sends the scheduling information unit of the dedicated segment of the high efficiency signaling B field HE-SIG-B corresponding to the STA in a repeated manner on the working channel, and comprises:

24. The AP of claim 20 or 21, wherein the time domain resource occupied by the first transmission block or the second transmission block is one OFDM symbol length, and the frequency domain resource occupied by the first transmission block is 20 MHz.