阅读说明：本技术 在无线lan系统中的发送设备及其方法 (Transmitting apparatus in wireless LAN system and method thereof ) 是由 朴恩成 崔镇洙 赵汉奎 于 2016-08-05 设计创作，主要内容包括：公开了一种在无线LAN系统中的发送设备及其方法。该STF信号被包括在用于改进MIMO传输的AGC估计的字段中。该STF信号的一部分用于发送上行链路,并且可用于从多个STA发送的上行链路MU PPDU。例如,所公开的STF信号用于40MHz频带或80MHz频带,可取地可用于40MHz频带,并且可基于重复预定M序列的序列来生成。所述预定M序列可以是长度为15比特的二进制序列。(A transmitting apparatus in a wireless LAN system and a method thereof are disclosed. The STF signal is included in a field for improving AGC estimation for MIMO transmission. A portion of the STF signal is used for transmitting uplink and may be used for uplink MU PPDUs transmitted from a plurality of STAs. For example, the disclosed STF signal is for a 40MHz band or an 80MHz band, desirably is available for a 40MHz band, and may be generated based on a sequence that repeats a predetermined M sequence. The predetermined M-sequence may be a binary sequence having a length of 15 bits.)

1. A method in a wireless local area network, LAN, system, the method comprising the steps of:

generating, by a transmitting device, a Short Training Field (STF) signal; and

transmitting the STF signal to a receiving device by the transmitting device,

wherein the STF signal is generated based on an STF sequence including an M sequence,

wherein the STF sequence is defined as follows:

{ M,1, -M,0, -M,1, -M } (1+ j)/sqrt (2), where sqrt () represents a square root, where "j" represents an imaginary number, and

wherein the M sequence has a length of 15 bits and is defined as follows:

M＝{-1,-1,-1,1,1,1,-1,1,1,1,-1,1,1,-1,1}。

2. the method of claim 1, wherein the { M,1, -M,0, -M,1, -M } × (1+ j)/sqrt (2) sequence is set at intervals of 16 tones starting from a lowest tone having a tone index-496 until a highest tone having a tone index + 496.

3. The method of claim 1, wherein the transmitting device selects a first frequency tone spacing or a second frequency tone spacing, and wherein the transmitting device configures the STF signal based on the selected frequency tone spacing.

4. The method of claim 3, wherein the first frequency tone spacing is equal to 8, and wherein the second frequency tone spacing is equal to 16.

5. The method of claim 1, wherein the STF signal is generated for an 80MHz band.

6. The method of claim 1, wherein the STF signal is used for automatic gain control, AGC, estimation in a multiple-input multiple-output, MIMO, transmission.

7. A transmission apparatus of a wireless local area network, LAN, system, the transmission apparatus comprising:

a Radio Frequency (RF) unit that transmits or receives a radio signal; and

a processor controlling the RF unit,

wherein the processor is configured to:

generating a Short Training Field (STF) signal; and is

Transmitting the STF signal to a receiving device,

wherein the STF signal is generated based on an STF sequence including an M sequence,

wherein the STF sequence is defined as follows:

{ M,1, -M,0, -M,1, -M } (1+ j)/sqrt (2), where sqrt () represents a square root, where "j" represents an imaginary number, and

wherein the M sequence has a length of 15 bits and is defined as follows:

M＝{-1,-1,-1,1,1,1,-1,1,1,1,-1,1,1,-1,1}。

8. the transmitting device of claim 7, wherein the { M,1, -M,0, -M,1, -M } (1+ j)/sqrt (2) sequence is set at intervals of 16 tones starting from a lowest tone having a tone index-496 until a highest tone having a tone index + 496.

9. The transmitting device of claim 7, wherein the transmitting device selects a first frequency tone spacing or a second frequency tone spacing, and wherein the transmitting device configures the STF signal based on the selected frequency tone spacing.

10. The transmitting device of claim 9, wherein the first frequency tone spacing is equal to 8, and wherein the second frequency tone spacing is equal to 16.

11. The transmission device of claim 7, wherein the STF signal is generated for an 80MHz band.

12. The transmission apparatus of claim 7, wherein the STF signal is used for Automatic Gain Control (AGC) estimation in a multiple-input multiple-output (MIMO) transmission.

Technical Field

The present specification relates to a method of generating a sequence for a training field in a wireless LAN system, and more particularly, to a method and apparatus of generating a Short Training Field (STF) sequence usable in multiple frequency bands in a wireless LAN system.

Background

A discussion of the next generation of Wireless Local Area Networks (WLANs) is ongoing. In the next-generation WLAN, the purpose is 1) to improve an Institute of Electrical and Electronics Engineers (IEEE)802.11 Physical (PHY) layer and a Medium Access Control (MAC) layer in frequency bands of 2.4GHz and 5GHz, 2) to increase spectrum efficiency and area throughput, 3) to improve performance in actual indoor and outdoor environments (e.g., an environment where an interference source exists, a dense heterogeneous network environment, and an environment where a high user load exists), and the like.

The environment mainly considered in the next generation WLAN is a dense environment where there are a large number of Access Points (APs) and Stations (STAs), and under such dense environment, improvements in spectrum efficiency and area throughput are discussed. In addition, in the next generation WLAN, significant performance improvement is focused on an outdoor environment that is not much considered in the existing WLAN, in addition to an indoor environment.

In detail, scenes such as wireless offices, smart homes, stadiums, hotspots, and buildings/apartments are mainly focused on in the next-generation WLANs, and discussions are being made on system performance improvement in a dense environment where there are a large number of APs and STAs based on the corresponding scenes.

In the next generation WLAN, it is expected to actively discuss the improvement of system performance in an Overlapping Basic Service Set (OBSS) environment and the improvement of outdoor environment performance and cellular offloading, rather than the improvement of single link performance in one Basic Service Set (BSS). The directionality of the next generation means that the next generation WLAN gradually has a similar technical range as the mobile communication. When considering the situation in which mobile communication and WLAN technology are discussed in the small cell and direct-to-direct (D2D) communication area in recent years, the technology and commercial convergence of next generation WLAN and mobile communication is expected to be more active.

Disclosure of Invention

Technical purpose

The present specification proposes a method and apparatus for configuring a sequence for a training field in a wireless LAN system.

Examples of the present specification propose a technical solution for enhancing the problems existing in the prior art in the sequence for the STF field.

Technical scheme

Examples of the present specification propose a transmission method applicable to a wireless LAN system, and more particularly, a method and apparatus for configuring an STF signal supporting at least any one of a plurality of frequency bands supported by the wireless LAN system.

A transmission apparatus according to an example of the present invention generates a Short Training Field (STF) signal corresponding to a first frequency band and transmits a Physical Protocol Data Unit (PPDU) including the STF signal.

The STF signal corresponding to the first frequency band may be generated based on a sequence repeating a predetermined M sequence.

The repeated sequence may be defined as { M, -1, -M0, M, -1, M } (1+ j)/sqrt (2).

The predetermined M-sequence may correspond to a binary sequence having a length of 15 bits. In this case, the M sequence may correspond to M { -1, -1, -1,1,1,1, -1,1,1,1, -1,1,1 }.

Effects of the invention

According to an example of the present specification, a method of generating an STF signal usable in a wireless LAN system is proposed herein.

The method of generating an STF signal proposed in the examples of the present specification solves the problems existing in the prior art.

Drawings

Fig. 1 is a conceptual diagram illustrating the structure of a Wireless Local Area Network (WLAN).

Fig. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.

Fig. 3 is a diagram illustrating an example of an HE PDDU.

Fig. 4 is a diagram illustrating a layout of Resource Units (RUs) used in a frequency band of 20 MHz.

Fig. 5 is a diagram illustrating a layout of Resource Units (RUs) used in a frequency band of 40 MHz.

Fig. 6 is a diagram illustrating a layout of Resource Units (RUs) used in a frequency band of 80 MHz.

Fig. 7 is a diagram illustrating another example of the HE PPDU.

Fig. 8 is a block diagram illustrating one example of an HE-SIG-B according to an embodiment.

Fig. 9 shows an example of a trigger frame.

Fig. 10 shows an example of the common information field.

Fig. 11 shows an example of subfields included in the per-user information field.

Fig. 12 is a block diagram illustrating an example of an uplink MU PPDU.

Fig. 13 illustrates 1x HE-STF tones in a per-channel PPDU transmission according to an exemplary embodiment of the present invention.

Fig. 14 illustrates 2x HE-STF tones in a per-channel PPDU transmission according to an exemplary embodiment of the present invention.

Fig. 15 shows an example of a repeating M sequence.

Fig. 16 is an example illustrating the repetitive structure of fig. 15 in more detail.

Fig. 17 shows an example of a repeating M sequence.

Fig. 18 is an example illustrating the repetitive structure of fig. 17 in more detail.

Fig. 19 is a diagram indicating the above-described example of PAPR in an RU unit used in a 20MHz band.

Fig. 20 is a diagram indicating the above-described example of PAPR in an RU unit used in a 40MHz band.

Fig. 21 is a diagram indicating the above-described example of PAPR in an RU unit used in a left side band of an 80MHz band.

Fig. 22 is a diagram indicating the above-described example of PAPR in an RU unit used in a right-side band of an 80MHz band.

Fig. 23 shows an example of a repeating M sequence.

Fig. 24 is an example illustrating the repetitive structure of fig. 23 in more detail.

Fig. 25 is a diagram indicating the above-described example of PAPR in an RU unit used in a 20MHz band.

Fig. 26 is a diagram indicating the above-described example of PAPR in an RU unit used in a 40MHz band.

Fig. 27 is a diagram indicating the above-described example of PAPR in an RU unit used in a left side band of an 80MHz band.

Fig. 28 is a diagram indicating the above-described example of PAPR in an RU unit used in a right-side band of an 80MHz band.

FIG. 29 is a process flow diagram to which the above example may be applied.

Fig. 30 is a diagram illustrating PAPR for an RU used in a 20MHz band.

Fig. 31 is a diagram illustrating PAPR for an RU used in a 40MHz band.

Fig. 32 and 33 are diagrams respectively illustrating PAPR of RUs used in an 80MHz band.

Fig. 34 is a block diagram showing a wireless device to which exemplary embodiments of the present invention can be applied.

Detailed Description

Fig. 1 is a conceptual diagram illustrating the structure of a Wireless Local Area Network (WLAN).

The upper part of fig. 1 shows the structure of an infrastructure Basic Service Set (BSS) of Institute of Electrical and Electronics Engineers (IEEE) 802.11.

Referring to the upper part of fig. 1, the wireless LAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter referred to as BSSs). BSSs 100 and 105, which are a set of an Access Point (AP) and a station (STA1) (e.g., AP 125 and STA 100-1) that successfully synchronize to communicate with each other, are not concepts that indicate a particular area. The BSS 105 may include one or more STAs 105-1 and 105-2 that may join an AP 130.

The BSS may include at least one STA, an AP providing distributed services, and a Distributed System (DS)110 connecting a plurality of APs.

The distributed system 110 may implement an Extended Service Set (ESS)140 that is extended by connecting multiple BSSs 100 and 105. ESS 140 may be used as a term indicating a network configured by connecting one or more APs 125 or 130 via distribution system 110. APs included in one ESS 140 may have the same Service Set Identification (SSID).

The portal 120 may serve as a bridge connecting a wireless LAN network (IEEE 802.11) with another network (e.g., 802. X).

In the BSS shown in the upper portion of fig. 1, a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, the network is configured even between STAs to perform communication without the APs 125 and 130. A network that performs communication by configuring a network even between STAs without the APs 125 and 130 is defined as an ad hoc network or an Independent Basic Service Set (IBSS).

The lower part of fig. 1 shows a conceptual diagram illustrating an IBSS.

Referring to the lower part of fig. 1, the IBSS is a BSS operating in an ad hoc mode. Since the IBSS does not include an Access Point (AP), there is no centralized management entity that performs a management function in the center. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-4 and 155-5 are managed in a distributed manner. In an IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be constituted by mobile STAs and are not allowed to access the DS to constitute a self-contained network.

As a predetermined functional medium including a Medium Access Control (MAC) compliant with an Institute of Electrical and Electronics Engineers (IEEE)802.11 standard and a physical layer interface for a radio medium, the STA can be used as a meaning including all APs and non-AP Stations (STAs).

A STA may be referred to by various names such as mobile terminal, wireless device, wireless transmit/receive unit (WTRU), User Equipment (UE), Mobile Station (MS), mobile subscriber unit, or simply user.

Furthermore, the term user may be used in a variety of meanings, e.g., in wireless LAN communications, the term may be used to refer to STAs participating in uplink MU MIMO and/or uplink OFDMA transmissions. However, the meaning of the term is not limited thereto.

Fig. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.

As shown in FIG. 2, various types of PHY Protocol Data Units (PPDUs) may be used in standards such as IEEE a/g/n/ac. In detail, the LTF and STF fields include training signals, SIG-a and SIG-B include control information for the receiving station, and the data field includes user data corresponding to the PSDU.

In an embodiment, an improved technique associated with a signal (alternatively, a control information field) for a data field of a PPDU is provided. The signals provided in the embodiments may be applied to a high efficiency ppdu (he ppdu) according to the IEEE 802.11ax standard. That is, the improved signal in embodiments may be HE-SIG-a and/or HE-SIG-B included in the HE PPDU. HE-SIG-A and HE-SIG-B may even be denoted as SIG-A and SIG-B, respectively. However, the improved signal proposed in the embodiments is not particularly limited to the HE-SIG-a and/or HE-SIG-B standards, and may be applied to control/data fields having various names (including control information in a wireless communication system transmitting user data).

Fig. 3 is a diagram illustrating an example of an HE PDDU.