WO2019182426A1 - Method and apparatus for transmitting data through nccb in wireless lan system - Google Patents

Abstract

A method and an apparatus for transmitting data in a wireless LAN system are provided. More particularly, an AP transmits, to a STA, allocation information about a RU. The AP transmits, to the STA, data through a first NCCB band or a second NCCB band, on the basis of the allocation information about the RU. The first NCCB band is a 40 MHz or 60 MHz band which is generated by discontinuously bonding some of first to fourth 20 MHz bands included in an 80 MHz band. The allocation information about the RU includes first information and second information. When the data is transmitted through the first NCCB band, the second information includes information indicating that a first 26-RU included in some bands discontinuously bonded from among the first to fourth 20 MHz bands is not allocated. The first 26-RU is a RU adjacent to residual bands that are not discontinuously bonded from among the first to fourth 20 MHz bands.

Description

Method and apparatus for transmitting data through NCCB in WLAN system

The present disclosure relates to a technique for performing an NCCB in a WLAN system, and more particularly, to a method and apparatus for transmitting data through an NCCB in a WLAN system.

Discussion is underway for the next generation wireless local area network (WLAN). In next-generation WLANs, 1) enhancements to the Institute of Electronics and Electronics Engineers (IEEE) 802.11 physical physical access (PHY) and medium access control (MAC) layers in the 2.4 GHz and 5 GHz bands, and 2) spectral efficiency and area throughput. aims to improve performance in real indoor and outdoor environments, such as in environments where interference sources exist, dense heterogeneous network environments, and high user loads.

The environment mainly considered in the next-generation WLAN is a dense environment having many access points (APs) and a station (STA), and improvements in spectral efficiency and area throughput are discussed in such a dense environment. In addition, in the next generation WLAN, there is an interest in improving practical performance not only in an indoor environment but also in an outdoor environment, which is not much considered in a conventional WLAN.

Specifically, in the next-generation WLAN, there is a great interest in scenarios such as wireless office, smart home, stadium, hotspot, building / apartment, and AP based on the scenario. And STA are discussing about improving system performance in a dense environment with many STAs.

In addition, in the next-generation WLAN, there will be more discussion about improving system performance in outdoor overlapping basic service set (OBSS) environment, improving outdoor environment performance, and cellular offloading, rather than improving single link performance in one basic service set (BSS). It is expected. The directionality of these next-generation WLANs means that next-generation WLANs will increasingly have a technology range similar to that of mobile communications. Considering the recent situation in which mobile communication and WLAN technology are discussed together in the small cell and direct-to-direct (D2D) communication area, the technical and business convergence of next-generation WLAN and mobile communication is expected to become more active.

The present specification proposes a method and apparatus for transmitting data through an NCCB in a WLAN system.

An example of the present specification proposes a method for transmitting and receiving data through the NCCB.

This embodiment may be performed in a network environment in which a next generation WLAN system is supported. The next generation WLAN system is a WLAN system that improves the 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

In summary, the allocation information for the RU may be a PPDU or a field defined for performing NCCB in a next generation WLAN system. However, a PPDU and a field defined for performing the NCCB may be generated by using each subfield of the HE PPDU as it is to satisfy backward compatibility with the 802.11ax system.

This embodiment may be performed in a transmitting apparatus, and the transmitting apparatus may correspond to an AP. The receiver may correspond to an STA having a NCCB capability (non AP STA).

An access point (AP) transmits allocation information on a resource unit (RU) to a station (STA).

The STA transmits data through the first Non-Continuous Channel Bonding (NCCB) band or the second NCCB band based on the allocation information for the RU.

The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band. That is, when the entire band is 80 MHz, the first NCCB band may generate a 40 MHz band or a 60 MHz band by bonding discontinuous 20 MHz bands to each other. When generating a 60 MHz band, a specific 20 MHz band may be adjacent to each other. In the 80 MHz band, the number of cases in which 40 MHz and 60 MHz bands are generated by the NCCB may be five.

The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band. That is, when the entire band is 160 MHz, the second NCCB band may bond the discontinuous 20 MHz bands to each other to generate an 80 MHz band, generate a 100 MHz band, generate a 120 MHz band, or generate a 140 MHz band. The number of cases where 80 MHz, 100 MHz, 120 MHz, and 140 MHz are generated by the NCCB in the 160 band may be 64 in total.

The allocation information for the RU includes first information and second information.

The first information includes channel allocation information of the first NCCB band or the second NCCB band.

When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. .

In this case, the first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands. The first 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a first band except for the first 26 RU in the first NCCB band.

When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. . The second 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the fifth to twelfth 20 MHz bands. The second 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a second band except for the second 26 RU in the second NCCB band.

The first 26 RU and the second 26 RU may be punctured. This is to reduce the effect of interference on other channels by puncturing 26 RUs included in the boundary with other bands for coexistence with other bands other than the band for performing the NCCB.

A specific embodiment of tone allocation of the first 26 RU and the second 26 RU is as follows.

First, when data is transmitted through the first NCCB band, tone allocation positions of the first 26 RUs are as follows.

The first to fourth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 80 MHz band.

When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, the first 26 RU may be included in a boundary of the first 20 MHz band and a boundary of the fourth 20 MHz band. have. In this case, a boundary of the first 20 MHz band may be adjacent to the second 20 MHz band, and a boundary of the fourth 20 MHz band may be adjacent to the third 20 MHz band.

Assuming that the 80 MHz band includes only 26 RU, the 80 MHz band may consist of 37 26 RUs (including center 26 RU). Accordingly, the first 26 RU included in the boundary of the first 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU. The first 26 RU included in the boundary of the fourth 20 MHz band may be a 29 th 26 RU.

In addition, when the data is transmitted through the second NCCB band, the tone allocation position of the second 26 RU is as follows.

The fifth to twelfth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 160 MHz band.

When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, the second 26 RU may be bounded by the fifth 20 MHz band, bounded by the seventh 20 MHz band, and the second NCCB band. 9 may be included in the boundary of the 20MHz band. The boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, the boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, and the boundary of the ninth 20 MHz band is different from the tenth 20 MHz band. May be adjacent.

Assuming that the 160 MHz band includes only 26 RU, the 160 MHz band may consist of 37 26 RUs in the first 80 MHz band and 37 26 RUs in the second 80 MHz band (including center 26 RU). Accordingly, the second 26 RU included in the boundary of the fifth 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the seventh 20 MHz band may be the 19 th 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the ninth 20 MHz band may be the ninth 26 RU of the second 80 MHz band.

In addition, the allocation information for the RU may further include third information. The third information may further include allocation information for a null subcarrier included in the first NCCB band or the second NCCB band. The null subcarrier may be used for transmission of the data. This is because, when performing NCCB, the null subcarrier defined in the OFDMA RU allocation of 802.11ax does not need to be used for the purpose of not transmitting data.

The first NCCB band and the second NCCB band may be generated based on an orthogonal frequency division multiple access (OFDMA) tone allocation of an 802.11ax system. However, the minimum RU unit for performing the NCCB may correspond to 20 MHz (or 242 RU).

The present specification proposes a technique for transmitting and receiving data through an NCCB in a WLAN system.

According to the embodiment proposed in the present specification, the NCCB can be used to smoothly perform wideband transmission of the STA, increase channel efficiency of the WLAN system, and improve throughput of the STA. In addition, by using 26 RUs limited at the boundary of the NCCB band, it is possible to reduce the influence of interference received by other channels in the NCCB band.

1 is a conceptual diagram illustrating a structure of a wireless local area network (WLAN).

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

3 is a diagram illustrating an example of a HE PPDU.

4 is a diagram illustrating an arrangement of resource units (RUs) used on a 20 MHz band.

5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.

6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.

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

8 is a block diagram showing an example of the HE-SIG-B according to the present embodiment.

9 shows an example of a trigger frame.

10 illustrates an example of subfields included in a per user information field.

11 is a block diagram showing an example of a control field and a data field constructed according to the present embodiment.

12 is a diagram illustrating an example of a HE TB PPDU.

13 shows an NCCB combination of 40 MHz in an 80 MHz band.

14 shows an NCCB combination of 60 MHz in an 80 MHz band.

15 shows an example of a format of a PHY capability information field for performing an NCCB.

16 shows a 20 MHz band capable of performing NCCB in a 160 MHz band.

17 shows an example in which a guard tone is set in an NCCB combination of 40 MHz in an 80 MHz band.

18 shows an example in which a guard tone is set in an NCCB combination of 60 MHz in an 80 MHz band.

19 shows an example of an NCCB combination in an 80 MHz band.

20 shows an example of setting a null subcarrier in addition to a band for performing NCCB in an 80 MHz band.

21 is a diagram illustrating a procedure of transmitting data through an NCCB according to the present embodiment.

22 is a flowchart illustrating a procedure of transmitting data through an NCCB in an AP according to an embodiment.

23 is a flowchart illustrating a procedure of receiving data through an NCCB at an STA according to the present embodiment.

24 is a diagram for explaining an apparatus for implementing the method as described above.

25 illustrates a more detailed wireless device implementing an embodiment of the present invention.

1 is a conceptual diagram illustrating a structure of a wireless local area network (WLAN).

1 shows the structure of the infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.

Referring to the top of FIG. 1, the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS). The BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area. The BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.

The BSS may include at least one STA, APs 125 and 130 for providing a distribution service, and a distribution system (DS) 110 for connecting a plurality of APs.

The distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set. The ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110. APs included in one ESS 140 may have the same service set identification (SSID).

The portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).

In the BSS as shown in the upper part of FIG. 1, a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130. A network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).

1 is a conceptual diagram illustrating an IBSS.

Referring to the bottom of FIG. 1, the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. 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 the IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be mobile STAs, and access to a distributed system is not allowed, thus making a self-contained network. network).

A STA is any functional medium that includes medium access control (MAC) conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and a physical layer interface to a wireless medium. May be used to mean both an AP and a non-AP STA (Non-AP Station).

The STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.

On the other hand, the term "user" may be used in various meanings, for example, may also be used to mean an STA participating in uplink MU MIMO and / or uplink OFDMA transmission in wireless LAN communication. It is not limited to this.

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

As shown, various types of PHY protocol data units (PPDUs) have been used in the IEEE a / g / n / ac standard. Specifically, the LTF and STF fields included training signals, the SIG-A and SIG-B included control information for the receiving station, and the data fields included user data corresponding to the PSDU.

This embodiment proposes an improved technique for the signal (or control information field) used for the data field of the PPDU. The signal proposed in this embodiment may be applied on a high efficiency PPDU (HE PPDU) according to the IEEE 802.11ax standard. That is, the signals to be improved in the present embodiment may be HE-SIG-A and / or HE-SIG-B included in the HE PPDU. Each of HE-SIG-A and HE-SIG-B may also be represented as SIG-A or SIG-B. However, the improved signal proposed by this embodiment is not necessarily limited to the HE-SIG-A and / or HE-SIG-B standard, and controls / control of various names including control information in a wireless communication system for transmitting user data. Applicable to data fields.

3 is a diagram illustrating an example of a HE PPDU.

The control information field proposed in this embodiment may be HE-SIG-B included in the HE PPDU as shown in FIG. 3. The HE PPDU according to FIG. 3 is an example of a PPDU for multiple users. The HE-SIG-B may be included only for the multi-user, and the HE-SIG-B may be omitted in the PPDU for the single user.

As shown, a HE-PPDU for a multiple user (MU) includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), High efficiency-signal A (HE-SIG-A), high efficiency-signal-B (HE-SIG-B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF) It may include a data field (or MAC payload) and a PE (Packet Extension) field. Each field may be transmitted during the time period shown (ie, 4 or 8 ms, etc.).

Detailed description of each field of FIG. 3 will be described later.

4 is a diagram illustrating an arrangement of resource units (RUs) used on a 20 MHz band.

As shown in FIG. 4, resource units (RUs) corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU. For example, resources may be allocated in units of RUs shown for HE-STF, HE-LTF, and data fields.

As shown at the top of FIG. 4, 26-units (ie, units corresponding to 26 tones) may be arranged. Six tones may be used as the guard band in the leftmost band of the 20 MHz band, and five tones may be used as the guard band in the rightmost band of the 20 MHz band. In addition, seven DC tones are inserted into the center band, that is, the DC band, and 26-units corresponding to each of the 13 tones may exist to the left and right of the DC band. In addition, other bands may be allocated 26-unit, 52-unit, 106-unit. Each unit can be assigned for a receiving station, i. E. A user.

On the other hand, the RU arrangement of FIG. 4 is utilized not only for the situation for a plurality of users (MU), but also for the situation for a single user (SU), in which case one 242-unit is shown as shown at the bottom of FIG. It is possible to use and in this case three DC tones can be inserted.

In the example of FIG. 4, various sizes of RUs have been proposed, that is, 26-RU, 52-RU, 106-RU, 242-RU, and the like. Since the specific sizes of these RUs can be expanded or increased, the present embodiment Is not limited to the specific size of each RU (ie, the number of corresponding tones).

5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.

Just as RUs of various sizes are used in the example of FIG. 4, the example of FIG. 5 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like. In addition, five DC tones can be inserted at the center frequency, 12 tones are used as the guard band in the leftmost band of the 40 MHz band, and 11 tones are in the rightmost band of the 40 MHz band. This guard band can be used.

Also, as shown, the 484-RU may be used when used for a single user. Meanwhile, the specific number of RUs may be changed as in the example of FIG. 4.

6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.

Just as RUs of various sizes are used in the example of FIGS. 4 and 5, the example of FIG. 6 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, and the like. have. In addition, seven DC tones can be inserted in the center frequency, 12 tones are used as the guard band in the leftmost band of the 80 MHz band, and 11 tones in the rightmost band of the 80 MHz band. This guard band can be used. Also available is a 26-RU with 13 tones each located to the left and right of the DC band.

Also, as shown, when used for a single user, a 996-RU may be used, in which case five DC tones may be inserted.

Meanwhile, the specific number of RUs may be changed as in the example of FIGS. 4 and 5.

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

7 is another example illustrating the HE-PPDU block of FIG. 3 in terms of frequency.

The illustrated L-STF 700 may include a short training orthogonal frequency division multiplexing symbol. The L-STF 700 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.

The L-LTF 710 may include a long training orthogonal frequency division multiplexing symbol. The L-LTF 710 may be used for fine frequency / time synchronization and channel prediction.

L-SIG 720 may be used to transmit control information. The L-SIG 720 may include information about a data rate and a data length. In addition, the L-SIG 720 may be repeatedly transmitted. That is, the L-SIG 720 may be configured in a repeating format (for example, may be referred to as an R-LSIG).

The HE-SIG-A 730 may include control information common to the receiving station.

Specifically, the HE-SIG-A 730 may include 1) a DL / UL indicator, 2) a BSS color field which is an identifier of a BSS, 3) a field indicating a remaining time of a current TXOP interval, 4) 20, Bandwidth field indicating whether 40, 80, 160, 80 + 80 MHz, 5) field indicating the MCS scheme applied to HE-SIG-B, 6) dual subcarrier modulation for HE-SIG-B field indicating whether it is modulated by dual subcarrier modulation), 7) field indicating the number of symbols used for HE-SIG-B, and 8) indicating whether HE-SIG-B is generated over the entire band. Field, 9) field indicating the number of symbols of the HE-LTF, 10) field indicating the length and CP length of the HE-LTF, 11) field indicating whether additional OFDM symbols exist for LDPC coding, 12) A field indicating control information about a packet extension (PE), and 13) a field indicating information on a CRC field of the HE-SIG-A. have. Specific fields of the HE-SIG-A may be added or omitted. In addition, some fields may be added or omitted in other environments where the HE-SIG-A is not a multi-user (MU) environment.

In addition, the HE-SIG-A 730 may be composed of two parts, HE-SIG-A1 and HE-SIG-A2. HE-SIG-A1 and HE-SIG-A2 included in the HE-SIG-A may be defined in the following format structure (field) according to the PPDU. First, the HE-SIG-A field of the HE SU PPDU may be defined as follows.

In addition, the HE-SIG-A field of the HE MU PPDU may be defined as follows.

In addition, the HE-SIG-A field of the HE TB PPDU may be defined as follows.

The HE-SIG-B 740 may be included only when it is a PPDU for a multi-user (MU) as described above. Basically, the HE-SIG-A 750 or the HE-SIG-B 760 may include resource allocation information (or virtual resource allocation information) for at least one receiving STA.

8 is a block diagram showing an example of the HE-SIG-B according to the present embodiment.

As shown, the HE-SIG-B field includes a common field at the beginning, and the common field can be encoded separately from the following field. That is, as shown in FIG. 8, the HE-SIG-B field may include a common field including common control information and a user-specific field including user-specific control information. In this case, the common field may include a corresponding CRC field and may be coded into one BCC block. Subsequent user-specific fields may be coded into one BCC block, including a "user-feature field" for two users and a corresponding CRC field, as shown.

The previous field of HE-SIG-B 740 on the MU PPDU may be transmitted in duplicated form. In the case of the HE-SIG-B 740, the HE-SIG-B 740 transmitted in a part of the frequency band (for example, the fourth frequency band) is the frequency band of the corresponding frequency band (ie, the fourth frequency band). Control information for a data field and a data field of another frequency band (eg, the second frequency band) except for the corresponding frequency band may be included. In addition, the HE-SIG-B 740 of a specific frequency band (eg, the second frequency band) duplicates the HE-SIG-B 740 of another frequency band (eg, the fourth frequency band). It can be one format. Alternatively, the HE-SIG-B 740 may be transmitted in encoded form on all transmission resources. The field after the HE-SIG-B 740 may include individual information for each receiving STA that receives the PPDU.

The HE-STF 750 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.

The HE-LTF 760 may be used to estimate a channel in a MIMO environment or an OFDMA environment.

The size of the FFT / IFFT applied to the field after the HE-STF 750 and the HE-STF 750 may be different from the size of the FFT / IFFT applied to the field before the HE-STF 750. For example, the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 may be four times larger than the size of the IFFT applied to the field before the HE-STF 750. .

For example, at least one of L-STF 700, L-LTF 710, L-SIG 720, HE-SIG-A 730, HE-SIG-B 740 on the PPDU of FIG. When a field of s is called a first field, at least one of the data field 770, the HE-STF 750, and the HE-LTF 760 may be referred to as a second field. The first field may include a field related to a legacy system, and the second field may include a field related to a HE system. In this case, the FFT (fast Fourier transform) size / inverse fast Fourier transform (IFFT) size is N times the FFT / IFFT size used in the conventional WLAN system (N is a natural number, for example, N = 1, 2, 4) can be defined. That is, an FFT / IFFT of N (= 4) times size may be applied to the second field of the HE PPDU compared to the first field of the HE PPDU. For example, 256 FFT / IFFT is applied for a bandwidth of 20 MHz, 512 FFT / IFFT is applied for a bandwidth of 40 MHz, 1024 FFT / IFFT is applied for a bandwidth of 80 MHz, and 2048 FFT for a bandwidth of 160 MHz continuous or discontinuous 160 MHz. / IFFT can be applied.

In other words, the subcarrier spacing / subcarrier spacing is 1 / N times the size of the subcarrier space used in the conventional WLAN system (N is a natural number, for example, 78.125 kHz when N = 4). Can be. That is, a subcarrier spacing of 312.5 kHz, which is a conventional subcarrier spacing, may be applied to a first field of the HE PPDU, and a subcarrier space of 78.125 kHz may be applied to a second field of the HE PPDU.

Alternatively, the IDFT / DFT period applied to each symbol of the first field may be expressed as N (= 4) times shorter than the IDFT / DFT period applied to each data symbol of the second field. . That is, the IDFT / DFT length applied to each symbol of the first field of the HE PPDU is 3.2 μs, and the IDFT / DFT length applied to each symbol of the second field of the HE PPDU is 3.2 μs * 4 (= 12.8 μs Can be expressed as The length of an OFDM symbol may be a value obtained by adding a length of a guard interval (GI) to an IDFT / DFT length. The length of the GI can be various values such as 0.4 μs, 0.8 μs, 1.6 μs, 2.4 μs, 3.2 μs.

For convenience of description, although the frequency band used by the first field and the frequency band used by the second field are represented in FIG. 7, they may not exactly coincide with each other. For example, the main band of the first field (L-STF, L-LTF, L-SIG, HE-SIG-A, HE-SIG-B) corresponding to the first frequency band is the second field (HE-STF). , HE-LTF, Data) is the same as the main band, but in each frequency band, the interface may be inconsistent. 4 to 6, since a plurality of null subcarriers, DC tones, guard tones, etc. are inserted in the process of arranging the RU, it may be difficult to accurately match the interface.

The user, that is, the receiving station, may receive the HE-SIG-A 730 and may be instructed to receive the downlink PPDU based on the HE-SIG-A 730. In this case, the STA may perform decoding based on the changed FFT size from the field after the HE-STF 750 and the HE-STF 750. On the contrary, if the STA is not instructed to receive the downlink PPDU based on the HE-SIG-A 730, the STA may stop decoding and configure a network allocation vector (NAV). The cyclic prefix (CP) of the HE-STF 750 may have a larger size than the CP of another field, and during this CP period, the STA may perform decoding on the downlink PPDU by changing the FFT size.

Hereinafter, in the present embodiment, data (or frame) transmitted from the AP to the STA is called downlink data (or downlink frame), and data (or frame) transmitted from the STA to the AP is called uplink data (or uplink frame). Can be expressed in terms. In addition, the transmission from the AP to the STA may be expressed in terms of downlink transmission, and the transmission from the STA to the AP may be expressed in terms of uplink transmission.

In addition, each of the PHY protocol data units (PPDUs), frames, and data transmitted through downlink transmission may be expressed in terms of a downlink PPDU, a downlink frame, and downlink data. The PPDU may be a data unit including a PPDU header and a physical layer service data unit (PSDU) (or MAC protocol data unit (MPDU)). The PPDU header may include a PHY header and a PHY preamble, and the PSDU (or MPDU) may be a data unit including a frame (or an information unit of a MAC layer) or indicating a frame. The PHY header may be referred to as a physical layer convergence protocol (PLCP) header in another term, and the PHY preamble may be expressed as a PLCP preamble in another term.

In addition, each of the PPDUs, frames, and data transmitted through the uplink transmission may be expressed by the term uplink PPDU, uplink frame, and uplink data.

In a WLAN system to which the present embodiment is applied, the entire bandwidth may be used for downlink transmission to one STA and uplink transmission to one STA based on single (or single) -orthogonal frequency division multiplexing (SUDM) transmission. Do. In addition, in the WLAN system to which the present embodiment is applied, the AP may perform downlink (DL) multi-user (MU) transmission based on multiple input multiple output (MU MIMO), and such transmission is referred to as DL MU MIMO transmission. It can be expressed as.

In addition, in the WLAN system according to the present embodiment, an orthogonal frequency division multiple access (OFDMA) based transmission method is preferably supported for uplink transmission and / or downlink transmission. That is, uplink / downlink communication may be performed by allocating data units (eg, RUs) corresponding to different frequency resources to the user. In more detail, in the WLAN system according to the present embodiment, the AP may perform DL MU transmission based on OFDMA, and such transmission may be expressed by the term DL MU OFDMA transmission. When DL MU OFDMA transmission is performed, the AP may transmit downlink data (or downlink frame, downlink PPDU) to each of the plurality of STAs through each of the plurality of frequency resources on the overlapped time resources. The plurality of frequency resources may be a plurality of subbands (or subchannels) or a plurality of resource units (RUs). DL MU OFDMA transmission may be used with DL MU MIMO transmission. For example, DL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) on a specific subband (or subchannel) allocated for DL MU OFDMA transmission is performed. Can be.

In addition, in the WLAN system according to the present embodiment, UL MU transmission (uplink multi-user transmission) may be supported that a plurality of STAs transmit data to the AP on the same time resource. Uplink transmission on the overlapped time resource by each of the plurality of STAs may be performed in a frequency domain or a spatial domain.

When uplink transmission by each of the plurality of STAs is performed in the frequency domain, different frequency resources may be allocated as uplink transmission resources for each of the plurality of STAs based on OFDMA. The different frequency resources may be different subbands (or subchannels) or different resource units (RUs). Each of the plurality of STAs may transmit uplink data to the AP through different frequency resources allocated thereto. Such a transmission method through different frequency resources may be represented by the term UL MU OFDMA transmission method.

When uplink transmission by each of a plurality of STAs is performed on the spatial domain, different space-time streams (or spatial streams) are allocated to each of the plurality of STAs, and each of the plurality of STAs transmits uplink data through different space-time streams. Can transmit to the AP. The transmission method through these different spatial streams may be represented by the term UL MU MIMO transmission method.

The UL MU OFDMA transmission and the UL MU MIMO transmission may be performed together. For example, UL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) may be performed on a specific subband (or subchannel) allocated for UL MU OFDMA transmission.

In a conventional WLAN system that did not support MU OFDMA transmission, a multi-channel allocation method was used to allocate a wider bandwidth (for example, a bandwidth exceeding 20 MHz) to one UE. The multi-channel may include a plurality of 20 MHz channels when one channel unit is 20 MHz. In the multi-channel allocation method, a primary channel rule is used to allocate a wide bandwidth to the terminal. If the primary channel rule is used, there is a constraint for allocating a wide bandwidth to the terminal. Specifically, according to the primary channel rule, when a secondary channel adjacent to the primary channel is used in an overlapped BSS (OBSS) and 'busy', the STA may use the remaining channels except the primary channel. Can not. Accordingly, the STA can transmit the frame only through the primary channel, thereby being limited to the transmission of the frame through the multi-channel. That is, the primary channel rule used for multi-channel allocation in the existing WLAN system may be a big limitation in obtaining high throughput by operating a wide bandwidth in the current WLAN environment where there are not many OBSS.

In the present embodiment to solve this problem is disclosed a WLAN system supporting the OFDMA technology. That is, the above-described OFDMA technique is applicable to at least one of downlink and uplink. In addition, the above-described MU-MIMO technique may be additionally applied to at least one of downlink and uplink. When OFDMA technology is used, a plurality of terminals may be used simultaneously instead of one terminal without using a primary channel rule. Therefore, wide bandwidth operation is possible, and the efficiency of the operation of radio resources can be improved.

As described above, when uplink transmission by each of a plurality of STAs (eg, non-AP STAs) is performed in the frequency domain, the AP has different frequency resources for each of the plurality of STAs based on OFDMA. It may be allocated as a link transmission resource. In addition, as described above, different frequency resources may be different subbands (or subchannels) or different resource units (RUs).

Different frequency resources for each of the plurality of STAs are indicated through a trigger frame.

9 shows an example of a trigger frame. The trigger frame of FIG. 9 allocates resources for uplink multiple-user transmission and may be transmitted from the AP. The trigger frame may consist of a MAC frame and may be included in a PPDU. For example, it may be transmitted through the PPDU shown in FIG. 3, through the legacy PPDU shown in FIG. 2, or through a PPDU specifically designed for the trigger frame. If transmitted through the PPDU of FIG. 3, the trigger frame may be included in the illustrated data field.

Each field shown in FIG. 9 may be partially omitted, and another field may be added. In addition, the length of each field may be varied as shown.

The frame control field 910 of FIG. 9 includes information on the version of the MAC protocol and other additional control information, and the duration field 920 may include time information for NAV configuration or an identifier of the terminal (eg, For example, information about AID may be included.

In addition, the RA field 930 includes address information of the receiving STA of the corresponding trigger frame and may be omitted as necessary. The TA field 940 includes address information of an STA (for example, an AP) that transmits a corresponding trigger frame, and the common information field 950 is common to be applied to a receiving STA that receives the corresponding trigger frame. Contains control information. For example, a field indicating the length of the L-SIG field of the uplink PPDU transmitted in response to the trigger frame, or the SIG-A field of the uplink PPDU transmitted in response to the trigger frame (that is, HE-SIG-A). Information to control the content of the field). In addition, the common control information may include information about the length of the CP of the uplink PPDU transmitted in response to the trigger frame or information about the length of the LTF field.

In addition, it is preferable to include the per user information field (960 # 1 to 960 # N) corresponding to the number of receiving STAs receiving the trigger frame of FIG. The individual user information field may be called an "assignment field".

In addition, the trigger frame of FIG. 9 may include a padding field 970 and a frame check sequence field 980.

Each of the per user information fields 960 # 1 to 960 # N shown in FIG. 9 preferably includes a plurality of subfields.

10 shows an example of a subfield included in a common information field. Some of the subfields of FIG. 10 may be omitted, and other subfields may be added. In addition, the length of each illustrated subfield may be modified.

The trigger type field 1010 of FIG. 10 may indicate the trigger frame variant and the encoding of the trigger frame variant. The trigger type field 1010 may be defined as follows.

The UL BW field 1020 of FIG. 10 indicates a bandwidth in the HE-SIG-A field of a HE trigger based (TB) PPDU. The UL BW field 1020 may be defined as follows.

The Guard Interval (GI) and LTF Type fields 1030 of FIG. 10 indicate the GI and HE-LTF types of the HE TB PPDU response. The GI and LTF type fields 1030 may be defined as follows.

In addition, when the GI and LTF type field 1030 has a value of 2 or 3, the MU-MIMO LTF mode field 1040 of FIG. 10 indicates an LTF mode of a UL MU-MIMO HE TB PPDU response. In this case, the MU-MIMO LTF mode field 1040 may be defined as follows.

If the trigger frame allocates an RU that occupies the entire HE TB PPDU bandwidth and the RU is assigned to one or more STAs, the MU-MIMO LTF mode field 1040 may indicate a HE single stream pilot HE-LTF mode or a HE masked HE-LTF sequence mode. It is directed to either.

If the trigger frame does not allocate an RU occupying the entire HE TB PPDU bandwidth and the RU is not allocated to one or more STAs, the MU-MIMO LTF mode field 1040 is indicated in the HE single stream pilot HE-LTF mode. The MU-MIMO LTF mode field 1040 may be defined as follows.

11 illustrates an example of subfields included in an individual user information field. Some of the subfields of FIG. 11 may be omitted, and other subfields may be added. In addition, the length of each illustrated subfield may be modified.

The User Identifier field (or AID12 field, 1110) of FIG. 11 indicates an identifier of an STA (ie, a receiving STA) to which per user information corresponds. An example of the identifier is all or the AID. It can be part of it.

In addition, the RU Allocation field 1120 may be included. That is, when the receiving STA identified by the user identifier field 1110 transmits an uplink PPDU in response to the trigger frame of FIG. 9, the corresponding uplink PPDU through the RU indicated by the RU Allocation field 1120. Send. In this case, the RU indicated by the RU Allocation field 1120 preferably indicates the RUs shown in FIGS. 4, 5, and 6. The configuration of the specific RU allocation field 1120 will be described later.

The subfield of FIG. 11 may include a (UL FEC) coding type field 1130. The coding type field 1130 may indicate a coding type of an uplink PPDU transmitted in response to the trigger frame of FIG. 9. For example, when BCC coding is applied to the uplink PPDU, the coding type field 1130 is set to '1', and when LDPC coding is applied, the coding type field 1130 is set to '0'. Can be.

The subfield of FIG. 11 may include a UL MCS field 1140. The MCS field 1140 may indicate an MCS scheme applied to an uplink PPDU transmitted in response to the trigger frame of FIG. 9.

In addition, the subfield of FIG. 11 may include a trigger dependent user info field 1150. When the trigger type field 1010 of FIG. 10 indicates a basic trigger variant, the trigger dependent user information field 1150 may include an MPDU MU Spacing Factor subfield (2 bits), a TID Aggregation Limit subfield (3 bits), and a Reserved sub. Field (1 bit) and a Preferred AC subfield (2 bits).

Hereinafter, the present specification proposes an example of improving the control field included in the PPDU. The control field improved by the present specification includes a first control field including control information required for interpreting the PPDU and a second control field including control information for demodulating the data field of the PPDU. do. The first and second control fields may be various fields. For example, the first control field may be the HE-SIG-A 730 illustrated in FIG. 7, and the second control field may be the HE-SIG-B 740 illustrated in FIGS. 7 and 8. Can be.

Hereinafter, a specific example of improving the first or second control field will be described.

In the following example, a control identifier inserted into a first control field or a second control field is proposed. The size of the control identifier may vary, for example, may be implemented with 1-bit information.

The control identifier (eg, 1 bit identifier) may indicate whether 242-RU is allocated, for example when 20 MHz transmission is performed. As shown in FIGS. 4 to 6, RUs of various sizes may be used. These RUs can be broadly divided into two types of RUs. For example, all of the RUs shown in FIGS. 4 to 6 may be classified into 26-type RUs and 242-type RUs. For example, a 26-type RU may include 26-RU, 52-RU, 106-RU, and the 242-type RU may include 242-RU, 484-RU, and larger RUs.

The control identifier (eg, 1 bit identifier) may indicate that 242-type RU has been used. That is, it may indicate that 242-RU is included or 484-RU or 996-RU is included. If the transmission frequency band in which the PPDU is transmitted is a 20 MHz band, 242-RU is a single RU corresponding to the full bandwidth of the transmission frequency band (ie, 20 MHz) band. Accordingly, the control identifier (eg, 1 bit identifier) may indicate whether a single RU corresponding to the full bandwidth of the transmission frequency band is allocated.

For example, if the transmission frequency band is a 40 MHz band, the control identifier (eg, 1 bit identifier) is assigned a single RU corresponding to the entire band (ie, 40 MHz band) of the transmission frequency band. Can be indicated. That is, it may indicate whether the 484-RU has been allocated for the transmission of 40MHz.

For example, if the transmission frequency band is an 80 MHz band, the control identifier (eg, 1-bit identifier) is assigned a single RU corresponding to the entire band of the transmission frequency band (ie, 80 MHz band). Can be indicated. That is, it may indicate whether the 996-RU has been allocated for the transmission of 80MHz.

Various technical effects can be achieved through the control identifier (eg, 1 bit identifier).

First of all, when a single RU corresponding to the entire band of the transmission frequency band is allocated through the control identifier (eg, a 1-bit identifier), it is possible to omit allocation information of the RU. That is, since only one RU is allocated to all bands of the transmission frequency band instead of the plurality of RUs, it is possible to omit allocation information of the RU.

It can also be used as signaling for full-band multi-user full bandwidth MU-MIMO (MIMO). For example, when a single RU is allocated over the full bandwidth of the transmission frequency band, multiple users may be allocated to the single RU. That is, signals for each user are not spatially and spatially distinct, but other techniques (eg, spatial multiplexing) may be used to multiplex the signals for multiple users in the same single RU. Accordingly, the control identifier (eg, 1 bit identifier) may also be used to indicate whether to use the full-band multi-user MIMO as described above.

The common field included in the second control field HE-SIG-B 740 may include an RU allocation subfield. According to the PPDU bandwidth, the common field may include a plurality of RU allocation subfields (including N RU allocation subfields). The format of the common field may be defined as follows.

The RU allocation subfield included in the common field of the HE-SIG-B is configured with 8 bits, and can be indicated as follows for a 20 MHz PPDU bandwidth. The RU allocation to be used in the data portion in the frequency domain indicates the size of the RU and the placement of the RU in the frequency domain as an index. The mapping of the 8-bit RU allocation subfield for the RU allocation and the number of users per RU may be defined as follows.

The user-specific field included in the second control field HE-SIG-B 740 may include a user field, a CRC field, and a tail field. The format of the user-specific field may be defined as follows.

In addition, the user-specific field of the HE-SIG-B is composed of a plurality of user fields. Multiple user fields are located after the common field of the HE-SIG-B. The location of the RU allocation subfield of the common field and the user field of the user-specific field together identify the RU used to transmit data of the STA. Multiple RUs designated as a single STA are not allowed in the user-specific field. Thus, signaling that allows the STA to decode its data is carried in only one user field.

As an example, assume that the RU allocation subfield is indicated by 8 bits of 01000010 indicating that one 26-tone RU is followed by five 26-tone RUs, and that the 106-tone RU includes three user fields. . At this time, the 106-tone RU may support multiplexing of three users. The eight user fields contained in the user-specific fields are mapped to six RUs, the first three user fields are assigned MU-MIMO in the first 106-tone RU, and the remaining five user fields are five 26- It may indicate that it is allocated to each of the tone RU.

The user field included in the user-specific field of the HE-SIG-B may be defined as follows. First, the user field for non-MU-MIMO allocation is as follows.

User fields for MU-MIMO allocation are as follows:

12 is a diagram illustrating an example of a HE TB PPDU. The PPDU of FIG. 12 represents an uplink PPDU transmitted in response to the trigger frame of FIG. 9. At least one STA receiving the trigger frame from the AP may check the common information field and the individual user information field of the trigger frame and simultaneously transmit the HE TB PPDU with the other STA that received the trigger frame.

As shown, the PPDU of FIG. 12 includes various fields, each field corresponding to the fields shown in FIGS. 2, 3, and 7. Meanwhile, as shown, the HE TB PPDU (or uplink PPDU) of FIG. 12 may include only the HE-SIG-A field and not the HE-SIG-B field.

The PHY transmit / receive procedure in Wi-Fi may have a different packet configuration method, but is as follows. It looks like this: For simplicity, we will use only 11n and 11ax as examples, but 11g / ac follows a similar procedure.

That is, the PHY transmit procedure converts a MAC protocol data unit (MPDU) or an A-MPDU (A-MPDU) into a single PSDU (PHY service data unit) at the PHY stage, and preamble and tail bits and padding bits (if necessary). ) Is transmitted by inserting it).

The PHY receive procedure usually looks like this: When energy detection and preamble detection (L / HT / VHT / HE-preamble detection for each Wifi version), the information on PSDU configuration is obtained from PHY header (L / HT / VHT / HE-SIG) to read MAC header and data Read

Hereinafter, the PPDU transmission in which the preamble is punctured will be described.

Preamble puncturing may be signaled by the Bandwidth field of the HE-SIG-A field (see Table 2) of the HE MU PPDU.

In detail, the transmitter transmits the HE MU PPDU together with the preamble puncturing at 80 MHz. In this case, when the primary 20 MHz channel and the secondary 40 MHz channel are idle during the PIFS interval immediately before the start of the TXOP, only the secondary 20 MHz is punctured. (When Bandwidth field is set to 4)

In addition, the transmitter transmits the HE MU PPDU with preamble puncturing at 80 MHz. In this case, when one of the two 20 MHz subchannels of the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 40 MHz is idle during the PIFS interval immediately before the start of the TXOP, only one of the two 20 MHz subchannels of the secondary 40 MHz is punctured. (If Bandwidth field is set to 5)

In addition, the transmitter transmits the HE MU PPDU with preamble puncturing at 160 MHz or 80 + 80 MHz. In this case, when at least one of the four 20 MHz sub-channels in the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 80 MHz is idle during the PIFS interval immediately before the start of the TXOP, only the primary 20 MHz of the preamble is punctured. (When Bandwidth field is set to 6)

In addition, the transmitter transmits the HE MU PPDU with preamble puncturing at 160 MHz or 80 + 80 MHz. In this case, when at least one of the four 20 MHz sub-channels in the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 80 MHz is idle during the PIFS interval immediately before the start of the TXOP, only the primary 80 MHz of the preamble exists. (When Bandwidth field is set to 7)

It is optional for the HE STA to receive a preamble punctured HE PPDU having a Bandwidth field in the HE-SIG-A set to 4 to 7. FIG. Using the Punctured Preamble Rx subfield in the HE PHY Capabilities Information field of the HE Capabilities field, indicates that the HE STA can receive a preamble punctured HE PPDU having a bandwidth field in the HE-SIG-A set to 4 to 7. .

1. Applicable to the present invention Example

In a WLAN system, the STA may transmit signals using wide bandwidth (ex. 80MHz, 160Mhz). However, when one 20MHz channel in the wide bandwidth is busy, the channel cannot be used because of the busy one channel, or because the signal is transmitted only by using the continuous idle channel such as 20MHz or 40MHz. not. In addition, since only one channel or band is allocated to the STA to transmit a signal, it is difficult to provide high throughput when the wide bandwidth cannot be used. Therefore, in the present specification, in order to smoothly perform wide bandwidth transmission of an STA, the channel efficiency of the WLAN system is increased by proposing a method of transmitting and receiving a signal using bonding (NCCB (non-continuous channel bonding)) for a non continuous channel band in a band. And to improve throughput for the STA.

13 shows an NCCB combination of 40 MHz in an 80 MHz band.

14 shows an NCCB combination of 60 MHz in an 80 MHz band.

In order to provide high throughput using wide bandwidth, a plurality of bands or channels are allocated to one STA, and a method of transmitting WLAN signals by bonding the allocated channels or bands is proposed. In this case, at least one channel and band allocated to the STA are not adjacent to each other. For example, within 80mhz, the NCCB may use a channel combination as shown in FIGS. 13 and 14 according to the bandwidth size. In this case, the position of the channel may vary within 80MHz.

In order to transmit a signal using an NCCB using a channel configured as shown in FIGS. 13 and 14 in a WLAN band (ie 2.4 GHz and 5 GHz), an AP and an STA support a NCCB using a PHY capability information field during association or negotiation. The PHY capability information field for the NCCB may be configured as shown in FIG. 15.

15 shows an example of a format of a PHY capability information field for performing an NCCB.

Referring to FIG. 15, NCCB support sets the field to 1 when the NCCB is supported as an indication for defining whether the NCCB is supported or 0 when the NCCB is supported.

As shown in FIG. 15, the PHY capability field is configured by adding a capability field for supporting the NCCB. In this case, as the NCCB support field is added to the capability field, encoding and encoding of the following fields (channel width set and punctured preamble RX) are performed. The definition can be defined as follows. For example, indication information for each bit can be defined as follows. That is, it can be seen that the channel width set field of FIG. 15 includes information indicating not only a continuous channel but also a non-continuous channel.

B0 for support for a continuous 40MHz channel width in 2.4GHz

B1 for support for a non-continuous 40MHz in 80MHz width in 2.4GHz

B2 for support for a non-continuous 60MHz in 80MHz width in 2.4GHz

B3 for support for a continuous 40MHz and 80MHz channel width in 5GHz

B4 for support for a non-continuous 40MHz in 80MHz width in 5GHz

B5 for support for a non-continuous 60MHz in 80MHz width in 5GHz

B6 for support for 242-tone RUs in a 40MHz HE MU PPDU in the 2.4GHz

B7 for support for 242-tone RUs in a 40MHz and 80MHz HE MU PPDU in the 5GHz

B8 for support for 242-tone RUs in a 40MHz, 80MHz, 160MHz, 80 + 80 MHz HE MU PPDU in the 5GHz

B9 for support for a non-continuous 80MHz in 160MHz width in 5GHz

B10 for support for a non-continuous 100MHz in 160MHz width in 5GHz

B11 for support for a non-continuous 120MHz in 160MHz width in 5GHz

B12 for support for a non-continuous 140MHz in 160MHz width in 5GHz

B13 for support for a non-continuous 40MHz in 80MHz width in 5GHz

B14 for support for a non-continuous 60MHz in 80MHz width in 5GHz

B15 for support for a non-continuous 80MHz in 160MHz width in 5GHz

B16 for support for a non-continuous 100MHz in 160MHz width in 5GHz

B17 for support for a non-continuous 120MHz in 160MHz width in 5GHz

B18 for support for a non-continuous 140MHz in 160MHz width in 5GHz

In addition, when transmitting a signal using a non continuous channel, a Punctured Preamble Rx indicating whether to support preamble reception of a non continuous channel is configured with 6 bits. For example, by using the bit information, an STA may perform the following method. It indicates the preamble of a non continuous channel that can be received.

B0 for support for the reception of an 80 MHz preamble where one 20MHz subchannel is punctured.

B1 for support for the reception of an 80 MHz preamble where the two 20 MHz subchannels is punctured.

B2 for support for the reception of a 160 MHz preamble where the one 20 MHz subchannels is punctured

B3 for support for the reception of a 160 MHz preamble where the two 20 MHz subchannels is punctured

B4 for support for the reception of a 160 MHz preamble where the three 20 MHz subchannels is punctured

B5 for support for the reception of a 160 MHz preamble where the four 20 MHz subchannels is punctured

The bits allocated for the channel width set and punctured preamble RX in the PHY capability field for the NCCB are just one example and can be used by assigning different numbers of bits for various future extensions.

The AP may determine whether the STA supports non-continuous channel through the PHY capability field information. The AP may use the 11x OFDMA numerology to transmit and receive a signal by bonding a non continuous channel to an STA supporting NCCB. Non continuous channel bonding may be performed by the following method.

Specifically, the present specification proposes a tone allocation and data encoding method for an NCCB when a signal is transmitted using an NCCB to increase spectrum efficiency and provide a high throughput to an STA using a wide bandwidth.

WLAN uses wide bandwidth to provide high throughput. However, wide bandwidth is available only when all 20MHz channels corresponding to wide bandwidth are continuously idle due to channel contention, so wide bandwidth cannot be effectively used. Accordingly, the present specification proposes a tone allocation method for using wide bandwidth by non continuous channel bonding and a data encoding method according to the tone allocation.

The NCCB may be performed using a non continuous channel (for example, 20 MHz may be the minimum unit) within a bandwidth of 80 MHz / 160 MHz, and the BWs available through the NCCB in the BW are as follows.

1. In 80MHz band, 40MHz, 60MHz can be a band capable of NCCB.

2. In the 160MHz band, 80MHz, 100MHz, 120MHz, and 140MHz can be NCCB bands.

The bandwidth for the NCCB may be configured as shown in FIGS. 13, 14, and 16.

16 shows a 20 MHz band capable of performing NCCB in a 160 MHz band.

The band used for the NCCB at 160 MHz may be configured as shown in FIG. 16, similarly to the band for performing the 80 MHz band NCCB of FIGS. 13 and 14. For example, when each 20MHz channel within 160MHz is configured with FIG. 16, the BW formed through the NCCB is shown in the table below. That is, Table 14 shows an example of the channel configuration for each NCCB BW within 160MHz.

Bandwidth Configuration Sets 80 MHz 20 MHz + 60 MHz {1, (345)}, {1, (456)}, {1, (567)}, {1, (678)}, {2, (456)}, {2, (567)}, {2 , (678)}, {3, (567)}, {3, (678)}, {4, (678)}, {5, (123)}, {6, (123)}, {6, ( 234)}, {7, (123)}, {7, (234)}, {7, (345)}, {8, (123)}, {8, (234)}, {8, (345) }, {8, (456)}, 80 MHz 40 MHz + 40 MHz {(12), (45)}, {(12), (56)}, {(12), (67)}, {(12), (78)}, {(23), (56)}, {(23), (67)}, {(23), (78)}, {(34), (67)}, {(34), (78)}, {(45), (78)}, 100 MHz 20 MHz + 80 MHz {1, (3456)}, {1, (4567)}, {1, (5678)}, {2,4567), {2, (5678)}, {3, (5678)}, {6 , (1234)}, {7, (1234)}, {7, (2345)}, {8, (1234)}, {8, (2345)}, {8, (3456)}, 100 MHz 40 MHz + 60 MHz {(12), (456)}, {(12), (567)}, {(12), (678)}, {(23), (567)}, {(23), (678)}, {(34), (678)}, {(56), (123)}, {(67), (123)}, {(67), (234)}, {(78), (123)}, {(78), (234)}, {(78), (345)}, 120 MHz 20 MHz + 100 MHz {1, (34567)}, {1, (45678)}, {1, (5678)}, 120 MHz 40 MHz + 80 MHz {(12), (4567)}, {(12), (5678)}, {(1234), (78)}, {(2345), (78)}, 120 MHz 60 MHz + 60 MHz {(123), (567)}, {(123), (678)}, {(234), (678)}, 140 MHz 20 MHz + 120 MHz {1, (345678)}, {8, (123456)}, 140 MHz 40 MHz + 100 MHz {(12), (45678)}, {(12345), (78)}, 140 MHz 60 MHz + 80 MHz {(123), (5678)}, {(1234), (678)},

The notation of Sets in Table 14 is as follows. For example, when an NCCB having an 80 MHz band configured as 20 MHz + 60 MHz is represented by {1, 345}, 20M_1, 20M_3, 20M_4, and 20M_5 (20 MHz + 60 MHz) of FIG. 16 are bonded to each other. That is, the bands performing the NCCB in the entire 160 MHz band are 20M_1, 20M_3, 20M_4, and 20M_5.

As another example, if the NCCB having a size of 140 MHz band composed of 60 MHz + 80 MHz is represented by {(123), (5678)}, 20M_1, 20M_2, 20M_3 and 20M_5, 20M_6, 20M_7, 20M_8 (60MHz + 80MHz) of FIG. It is bonded to each other. That is, the bands performing the NCCB in the entire 160MHz band are 20M_1, 20M_2, 20M_3 and 20M_5, 20M_6, 20M_7, 20M_8.

The NCCB may be used by using the channel configuration as described above. In this case, the STA may use tone allocation of 11ac or 11ax for transmitting and receiving the NCCB. Tone allocation for each channel combination according to a system used for NCCB may be configured as follows.

2.1. 11ac  using numerology NCCB  If you do

○ STA / AP transmitting / receiving signals using NCCB uses tone allocation of 80 MHz / 160 Hz of 11ac to perform NCCB. In order to reduce signal interference for an STA or AP transmitting and receiving a signal through a channel not included in the NCCB, or to reduce the influence of interference by another channel when transmitting a signal using the NCCB, a guard is provided near the channel. The tone is allocated to reduce the influence of interference on other channels and interference by other channels.

17 shows an example in which a guard tone is set in an NCCB combination of 40 MHz in an 80 MHz band.

18 shows an example in which a guard tone is set in an NCCB combination of 60 MHz in an 80 MHz band.

For example, referring to the left diagram of FIG. 17, when 40 MHz is configured using 40 MHz NCCB, that is, 20 MHz_1 and 20 MHz_4 at 80 MHz, a guard tone is set to a tone adjacent to 20 MHz_2 and 20 MHz_3. Therefore, when configuring 40MHz using NCCB within 80MHz, the lower 3 tone / 4tone of 20MHz_1 is described as a guard tone, and in the case of 20MHz_4, the upper 4 / 3tone is set as a guard tone to configure bandwidth.

The number of guard tones may be set in consideration of tone allocation of 20 MHz transmission, and the guard tones may be configured using the number of tones of left guard / right guard of 20 MHz.

17 and 18 illustrate an example of 80 MHz, and NCCB may be performed by allocating a guard tone in the same manner with respect to 160 MHz.

In the case of 160MHz, channels of various sizes may exist between two channels performing channel bonding, and other STA / AP may transmit using these bandwidths. Therefore, in order to reduce interference between a channel used for NCCB and an unused channel, the number of guard tones set according to the channel size between bonding channels may be defined differently.

For example, when the bandwidth between bonding channels is 40/80 MHz, channel bonding may be performed by allocating 6/5 tones as guard tones to adjacent channels in consideration of 40/80 MHz tone allocation. However, due to the large number of guard tone assignments, the number of available tones is reduced and the data rate is slowed down. Therefore, in order to reduce data rate reduction, channel bonding may be performed by allocating a minimum guard tone (eg, guard tone according to 20 MHz tone allocation).

○ For NCCB transmission, AP / STA uses STF / LTF sequence defined for 80MHz / 160MHz transmission for STF / LTF transmission and transmits only STF / LTF corresponding to allocated channel or resource.

○ The pilot sequence used for tracking during NCCB can be composed using the pilot sequences of 80MHz / 160MHz and can consist only of the pilot sequence corresponding to the assigned channel.

2.2. 11ax  using numerology NCCB  Tone allocation for performance

○ Channel bonding using OFDMA tone allocation

In 11ax, different tone allocations are set and used to perform OFDMA according to BW. Therefore, channel bonding is performed as follows to use 11A OFDMA tone allocation.

19 shows an example of an NCCB combination in an 80 MHz band.

STA / AP performing channel bonding performs channel bonding based on 80 MHz / 160 MHz OFDMA tone allocation. For example, when OFDMA is used within 80 MHz, tone allocation is as shown in FIG. 6. In this case, when 40 MHz or 60 MHz is transmitted using the NCCB, the NCCB channel may be configured as shown in FIG. 19.

For example, when 40 MHz or 60 MHz is configured using NCCB within 80 MHz, the configuration of FIG. 19 is the same as in FIG. 19. RUs are not allocated (not shown except for 26 RUs in FIG. 19).

For example, for case1 (see Table 15 below) that uses 40HMz to send NCCB to NCCB within 80MHz, RU allocation for 80MHz is used for channel bonding.In this case, the 9th 26 RU tone corresponding to 20MHz_1 and 20MHz_4 Do not use the corresponding 29th 26 RU tone. The null subcarrier defined in 11ax OFDMA allocation corresponding to 20MHz_1 and 20MHz4 used for channel bonding is used for data transmission during channel bonding.

When performing the NCCB within 80 MHz, the RU size limited for each case is based on 26 RU tones, and the 26 RU tone index limited at this time is shown in the following table. The limited sequence number or index of 26 RUs may be determined from the lowest frequency (or the lowest index subcarrier) assuming only 26 RUs are used on the 80 MHz band as shown in FIG. 6.

Restricted 26 RU index 40 MHz _case1 9 ^th , 29 ^th 40 MHz _case2 9 ^th , 28 ^th 40 MHz _case3 10 ^th , 29 ^th 60 MHz _case1 9 ^th 60 MHz _case2 29 ^th

The channel used for the NCCB for the 160MHz as described above performs channel bonding except for 26 RU adjacent to other channels when performing the NCCB, and the null subcarrier included in the NCCB is used for data transmission during the NCCB. 40MHz_case and 60MHz_case of Table 15 may correspond to the case illustrated in FIG. 19. In addition, it can be seen that 60MHz_case of Table 15 is limited to only one 26 RU, because the center 26 RU is included in the boundary of the other channel. The center 26 RU is originally not used for transmission and is left blank.

For example, when the 80MHz band is configured using the NCCB for the entire 160MHz band, the restricted 26 RU is as follows. The limited sequence number or index of 26 RUs may be determined from the lowest frequency (or the lowest index subcarrier) assuming only 26 RUs are used on the 80 MHz band as shown in FIG. 6. The entire 160 MHz band includes 1 ^st 80 MHz (denoted as 1 ^st 80M in Table 16) and 2 ^nd 80 MHz (denoted as 2 ^nd 80M in Table 16), thus representing an index of 26 RUs limited in each 80 MHz band. In addition, the following table describes all cases in which an NCCB having a size of 80 MHz band configured as 20 MHz + 60 MHz in a total 160 MHz band exists.

Case Restricted 26 RU index {1, (345)}, 1 ^st 80M_9 ^th , 19 ^th , 2 ^nd 80M_9 ^th {1, (456)}, 1 ^st 80M_9 ^th , 29 ^th , 2 ^nd 80M_19 ^th {1, (567)}, 1 ^st 80M_9 ^th , 2 ^nd 80M_28 ^th {1, (678)}, 1 ^st 80M_9 ^th , 2 ^nd 80M_10 ^th {2, (456)}, 1 ^st 80M_10 ^th , 19 ^th , 29 ^th 2 ^nd 80M_19 ^th {2, (567)}, 1 ^st 80M_10 ^th , 19 ^th , 2 ^nd 80M_28 ^th {2, (678)}, 1 ^st 80M_10 ^th , 19 ^th , 2 ^nd 80M_10 ^th {3, (567)}, 1 ^st 80M_19 ^th , 28 ^th , 2 ^nd 80M_28 ^th {3, (678)}, 1 ^st 80M_19 ^th , 28 ^th , 2 ^nd 80M_10 ^th {4, (678)}, 1 ^st 80M_29 ^th , 2 ^nd 80M_10 ^th {5, (123)}, 1 ^st 80M_28 ^th , 2 ^nd 80M_9 ^th {6, (123)}, 1 ^st 80M_28 ^th , 2 ^nd 80M_10 ^th , 19 ^th {6, (234)}, 1 ^st 80M_10 ^th , 2 ^nd 80M_10 ^th , 19 ^th {7, (123)}, 1 ^st 80M_28 ^th , 2 ^nd 80M_19 ^th , 28 ^th {7, (234)}, 1 ^st 80M_10 ^th , 2 ^nd 80M_28 ^th , 19 ^th {7, (345)}, 1 ^st 80M_19 ^th , 2 ^nd 80M_9 ^th , 19 ^th, 28 ^th {8, (123)}, 1 ^st 80M_28 ^th , 2 ^nd 80M_29 ^th {8, (234)}, 1 ^st 80M_10 ^th , 2 ^nd 80M_20 ^th {8, (456)}, 1 ^st 80M_29 ^th 2 ^nd 80M_19 ^th

The notation of Case of Table 16 is the same as that of Sets of Table 14. For example, when an NCCB having an 80 MHz band configured as 20 MHz + 60 MHz is represented by {1, 345}, 20M_1, 20M_3, 20M_4, and 20M_5 (20 MHz + 60 MHz) of FIG. 16 are bonded to each other. That is, the bands performing the NCCB in the entire 160MHz band are 20M_1, 20M_3, 20M_4, and 20M_5. In this case, in the 1 ^st 80 MHz band (corresponding to 20M_1 to 20M_4 in FIG. 16), the ninth 26 RU and the 19 th 26 RU include boundaries of other channels and thus are not used (assigned) for NCCB transmission. Also, the 2 ^nd 80MHz band (Fig. 16 corresponds to the 20M_5 to 20M_8) 9 beonjjae 26 RU also because it contains a boundary of another channel not used in the NCCB transfer (assign).

BW for NCCB In order to reduce the influence of interference as in the above example, 26 RU tone is used as a guard tone at the boundary of the channel used for NCCB, and a null subcarrier configured for OFDMA transmission is set to an available tone during channel bonding. do.

20 shows an example of setting a null subcarrier in addition to a band for performing NCCB in an 80 MHz band.

○ Unlike the above, the NCCB uses tone allocation for full bandwidth, and a tone corresponding to a channel not used for the NCCB may be considered as a null subcarrier and transmitted. For example, in case 1 (60 MHz_case1 in Table 15) transmitting using an NCCB using an NCCB within 80 MHz, all of the tones corresponding to 20 MHz_2 that are not allocated in the tone allocation using all 80 MHz are null subcarriers. Do not transmit the NCCB signal.

○ In order to configure the above tone allocation, when performing NCCB, the channel bandwidth field indicates a value for full bandwidth, and an indication of the available tone within the full bandwidth is performed using 242 RU empty info (01110001) of the RU allocation field. (If the RU allocation field is set to 01110001 in Table 9, it can be seen that the corresponding 20MHz band can be set to 242-tone RU empty).

○ In other way, the indication of 242 RU not used for transmission within full bandwidth can be given to configure tone allocation in the same way as above, and the reserved information of 8 bit allocation is used for unused 242 RU indication in BW. It can be indicated as follows.

For example, a reserved bit (011101x1x0) may be used for an indication within 80 MHz (the RU allocation field is set to 011101x1x0 in Table 9, which is still reserved) and indicates an empty 242 using a value of x1x0.

Value Indication 0 1 ^st 242 RU empty One 2 ^nd 242 RU empty 2 3 ^rd 242 RU empty 3 4 ^th 242 RU empty

As another example, a reserved bit (01111y2y1y0) may be used for an indication within 160 MHz and an empty 242 is indicated using a value of y2y1y0.

Value Indication 0 1 ^st 242 RU empty One 2 ^nd 242 RU empty 2 3 ^rd 242 RU empty 3 4 ^th 242 RU empty 4 5 ^th 242 RU empty 5 6 ^th 242 RU empty 6 7 ^th 242 RU empty 7 8 ^th 242 RU empty

○ In case of performing NCCB above, STF / LTF can use STF / LTF set for 11MHz 80MHz / 160MHz transmission. In this case, STF / LTF sequence corresponding to unused band or channel (242 RU empty) is transmitted. I never do that. In order to prevent interference with 242RU that is not transmitted, a guard tone (ex. Left = 4, right = 3) other than the 242RU tone is additionally set to null so that a signal is not transmitted to the corresponding tone.

In the present specification, for example, in consideration of the complexity of channel bonding, two channels are described by bonding and transmitting, but the signal may be transmitted by applying the method proposed in the above embodiment regardless of the number of bonding.

21 is a diagram illustrating a procedure of transmitting data through an NCCB according to the present embodiment.

NCCB is a channel bonding technique that transmits and receives data by bonding non-contiguous channels (minimum unit 20 MHz) in a broadband such as 80 MHz or 160 MHz.

Referring to FIG. 21, in order to perform NCCB in a WLAN band such as 2.4 GHz or 5 GHz, an AP and an STA may first transmit a PHY Capabilities Information field at association / negotiation. The PHY Capabilities Information field may include information on whether NCCB is supported, channel bandwidth, and whether NCCB supports preamble reception. A detailed description of the PHY Capabilities Information field has been described with reference to FIG. 15.

Referring to FIG. 21, the AP transmits allocation information (or tone allocation information) for the RU to the STA (2120). The allocation information for the RU includes channel allocation information of the NCCB band and information that 26 RUs included in the boundary of the NCCB band are punctured. The present specification proposes an embodiment in which the NCCB band uses 26 RUs limited at the boundary of the NCCB band to reduce the influence of interference received by other channels (bands not included in the NCCB band). A detailed description of 26 RU tone allocation limited to the NCCB band boundary will be described later with reference to FIGS. 22 and 23.

The AP or the STA may transmit / receive data through a band excluding the limited 26 RU from the NCCB band determined based on the allocation information for the RU (2130).

22 is a flowchart illustrating a procedure of transmitting data through an NCCB in an AP according to an embodiment.

22 may be performed in a network environment in which a next generation WLAN system is supported. The next generation WLAN system is a WLAN system that improves the 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

In summary, the allocation information for the RU may be a PPDU or a field defined for performing NCCB in a next generation WLAN system. However, a PPDU and a field defined for performing the NCCB may be generated by using each subfield of the HE PPDU as it is to satisfy backward compatibility with the 802.11ax system.

An example of FIG. 22 may be performed in a transmitter, and the transmitter may correspond to an AP. The receiving device of FIG. 22 may correspond to an STA having a NCCB capability (non AP STA).

In step S2210, the access point (AP) transmits allocation information on a resource unit (RU) to a station (STA).

In step S2220, the STA transmits data through the first Non-Continuous Channel Bonding (NCCB) band or the second NCCB band based on the allocation information about the RU.

The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band. That is, when the entire band is 80 MHz, the first NCCB band may generate a 40 MHz band or a 60 MHz band by bonding discontinuous 20 MHz bands to each other. When generating a 60 MHz band, a specific 20 MHz band may be adjacent to each other. In the 80 MHz band, the number of cases in which 40 MHz and 60 MHz bands are generated by the NCCB may be five.

The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band. That is, when the entire band is 160 MHz, the second NCCB band may bond the discontinuous 20 MHz bands to each other to generate an 80 MHz band, generate a 100 MHz band, generate a 120 MHz band, or generate a 140 MHz band. The number of cases where 80 MHz, 100 MHz, 120 MHz, and 140 MHz are generated by the NCCB in the 160 band may be 64 in total.

The allocation information for the RU includes first information and second information.

The first information includes channel allocation information of the first NCCB band or the second NCCB band.

When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. .

In this case, the first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands. The first 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a first band except for the first 26 RU in the first NCCB band.

When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. . The second 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the fifth to twelfth 20 MHz bands. The second 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a second band except for the second 26 RU in the second NCCB band.

The first 26 RU and the second 26 RU may be punctured. This is to reduce the effect of interference on other channels by puncturing 26 RUs included in the boundary with other bands for coexistence with other bands other than the band for performing the NCCB.

A specific embodiment of tone allocation of the first 26 RU and the second 26 RU is as follows.

First, when data is transmitted through the first NCCB band, tone allocation positions of the first 26 RUs are as follows.

The first to fourth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 80 MHz band.

When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, the first 26 RU may be included in a boundary of the first 20 MHz band and a boundary of the fourth 20 MHz band. have. In this case, a boundary of the first 20 MHz band may be adjacent to the second 20 MHz band, and a boundary of the fourth 20 MHz band may be adjacent to the third 20 MHz band.

Assuming that the 80 MHz band includes only 26 RU, the 80 MHz band may consist of 37 26 RUs (including center 26 RU). Accordingly, the first 26 RU included in the boundary of the first 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU. The first 26 RU included in the boundary of the fourth 20 MHz band may be a 29 th 26 RU.

In addition, when the data is transmitted through the second NCCB band, the tone allocation position of the second 26 RU is as follows.

The fifth to twelfth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 160 MHz band.

When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, the second 26 RU may be bounded by the fifth 20 MHz band, bounded by the seventh 20 MHz band, and the second NCCB band. 9 may be included in the boundary of the 20MHz band. The boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, the boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, and the boundary of the ninth 20 MHz band is different from the tenth 20 MHz band. May be adjacent.

Assuming that the 160 MHz band includes only 26 RU, the 160 MHz band may consist of 37 26 RUs in the first 80 MHz band and 37 26 RUs in the second 80 MHz band (including center 26 RU). Accordingly, the second 26 RU included in the boundary of the fifth 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the seventh 20 MHz band may be the 19 th 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the ninth 20 MHz band may be the ninth 26 RU of the second 80 MHz band.

In addition, the allocation information for the RU may further include third information. The third information may further include allocation information for a null subcarrier included in the first NCCB band or the second NCCB band. The null subcarrier may be used for transmission of the data. This is because, when performing NCCB, the null subcarrier defined in the OFDMA RU allocation of 802.11ax does not need to be used for the purpose of not transmitting data.

The first NCCB band and the second NCCB band may be generated based on an orthogonal frequency division multiple access (OFDMA) tone allocation of an 802.11ax system. However, the minimum RU unit for performing the NCCB may correspond to 20 MHz (or 242 RU).

Hereinafter, signaling information for performing the NCCB will be described in detail.

The first information may further include NCCB indication information on whether or not NCCB can be performed. For example, the NCCB indication information may be set to 1 if the NCCB transmission can be performed, and the NCCB indication information may be set to 0 if the MU transmission of 802.11ax can be simply performed.

The first information may further include NCCB bandwidth information of a band to be used for transmitting the PPDU among the first NCCB band and the second NCCB band. If the first information is set to the first value, the band to be used for transmitting the data may be determined as the first NCCB. If the first information is set to a second value, a band to be used for transmitting the data may be determined as the second NCCB.

In addition, the second information may be included in resource unit (RU) allocation information in a common field of the HE-SIG B.

When the band to be used for transmitting the data is determined as the first NCCB, the third information may be set as bit information of 01111y2y1y0 for the 80MHz band. The bit information of 01111y2y1y0 may include channel allocation information of the 40 MHz or 60 MHz band. That is, the number of cases of NCCBs in up to eight 80 MHz bands may be indicated through y2y1y0 of the eight bits. In fact, since the number of NCCBs in the 80 MHz band is five, it can be sufficiently indicated through the bit information of 01111y2y1y0.

When the band to be used for transmitting the data is determined as the second NCCB, the third information may be set to bit information of 111x4x3x2x1x0 per 80MHz for the 160MHz band. The bit information of 111x4x3x2x1x0 may include allocation information per 80 MHz for channel allocation in the 80 MHz, 100 MHz, 120 MHz, or 140 MHz band. That is, x4x3x2x1x0 bits may be used for the first 80 MHz band of the 160 MHz band, and x4x3x2x1x0 bits may be used for the second 80 MHz band, so that the total number of cases of NCCBs in the 160 MHz band of 1024 (32 * 32) Can be directed. In fact, since the number of NCCBs in the 160 MHz band is 64, it can be sufficiently indicated through the two 111x4x3x2x1x0 bit information.

The 01111y2y1y0 and the 111x4x3x2x1x0 may be included in a reserved bit of the RU allocation information.

In addition, the AP may transmit physical capability information to the STA to perform the NCCB.

The physical capability information may include third information, fourth information, and fifth information.

The third information may be NCCB support information (NCCB support field) on whether the NCCB can be supported.

The fourth information may be channel bandwidth information (Channel width set field) of a continuous or discontinuous channel at 2.4 GHz and 5 GHz frequencies. The channel bandwidth information may also include channel bandwidths for the first NCCB band and the second NCCB band.

The fifth information may be information on a 20 MHz band punctured in the 80 MHz band and the 160 MHz band (Punctured preamble RX field). The first NCCB band and the second NCCB band may be generated except for the punctured 20 MHz band.

According to the above method, the NCCB can be used to smoothly perform wideband transmission of the STA, increase channel efficiency of the WLAN system, and improve throughput of the STA. In addition, by using 26 RUs limited at the boundary of the NCCB band, it is possible to reduce the influence of interference received by other channels in the NCCB band.

23 is a flowchart illustrating a procedure of receiving data through an NCCB at an STA according to the present embodiment.

An example of FIG. 23 may be performed in a network environment in which a next generation WLAN system is supported. The next generation WLAN system is a WLAN system that improves the 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

In summary, the allocation information for the RU may be a PPDU or a field defined for performing NCCB in a next generation WLAN system. However, a PPDU and a field defined for performing the NCCB may be generated by using each subfield of the HE PPDU as it is to satisfy backward compatibility with the 802.11ax system.

An example of FIG. 23 may be performed in a receiving apparatus and may correspond to an STA having a NCCB capability (non AP STA). The transmitter of FIG. 23 may correspond to an AP.

In operation S2310, allocation information about a resource unit (RU) is received from an access point (AP).

In step S2320, the one STA receives data from the AP through a first Non-Continuous Channel Bonding (NCCB) band or a second NCCB band based on allocation information on the RU.

The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band. That is, when the entire band is 80 MHz, the first NCCB band may generate a 40 MHz band or a 60 MHz band by bonding discontinuous 20 MHz bands to each other. When generating a 60 MHz band, a specific 20 MHz band may be adjacent to each other. In the 80 MHz band, the number of cases in which 40 MHz and 60 MHz bands are generated by the NCCB may be five.

The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band. That is, when the entire band is 160 MHz, the second NCCB band may bond the discontinuous 20 MHz bands to each other to generate an 80 MHz band, generate a 100 MHz band, generate a 120 MHz band, or generate a 140 MHz band. The number of cases where 80 MHz, 100 MHz, 120 MHz, and 140 MHz are generated by the NCCB in the 160 band may be 64 in total.

The allocation information for the RU includes first information and second information.

The first information includes channel allocation information of the first NCCB band or the second NCCB band.

When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. .

In this case, the first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands. The first 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a first band except for the first 26 RU in the first NCCB band.

When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. . The second 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the fifth to twelfth 20 MHz bands. The second 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a second band except for the second 26 RU in the second NCCB band.

The first 26 RU and the second 26 RU may be punctured. This is to reduce the effect of interference on other channels by puncturing 26 RUs included in the boundary with other bands for coexistence with other bands other than the band for performing the NCCB.

A specific embodiment of tone allocation of the first 26 RU and the second 26 RU is as follows.

First, when data is transmitted through the first NCCB band, tone allocation positions of the first 26 RUs are as follows.

The first to fourth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 80 MHz band.

When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, the first 26 RU may be included in a boundary of the first 20 MHz band and a boundary of the fourth 20 MHz band. have. In this case, a boundary of the first 20 MHz band may be adjacent to the second 20 MHz band, and a boundary of the fourth 20 MHz band may be adjacent to the third 20 MHz band.

Assuming that the 80 MHz band includes only 26 RU, the 80 MHz band may consist of 37 26 RUs (including center 26 RU). Accordingly, the first 26 RU included in the boundary of the first 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU. The first 26 RU included in the boundary of the fourth 20 MHz band may be a 29 th 26 RU.

In addition, when the data is transmitted through the second NCCB band, the tone allocation position of the second 26 RU is as follows.

The fifth to twelfth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 160 MHz band.

When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, the second 26 RU may be bounded by the fifth 20 MHz band, bounded by the seventh 20 MHz band, and the second NCCB band. 9 may be included in the boundary of the 20MHz band. The boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, the boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, and the boundary of the ninth 20 MHz band is different from the tenth 20 MHz band. May be adjacent.

Assuming that the 160 MHz band includes only 26 RU, the 160 MHz band may consist of 37 26 RUs in the first 80 MHz band and 37 26 RUs in the second 80 MHz band (including center 26 RU). Accordingly, the second 26 RU included in the boundary of the fifth 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the seventh 20 MHz band may be the 19 th 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the ninth 20 MHz band may be the ninth 26 RU of the second 80 MHz band.

In addition, the allocation information for the RU may further include third information. The third information may further include allocation information for a null subcarrier included in the first NCCB band or the second NCCB band. The null subcarrier may be used for transmission of the data. This is because, when performing NCCB, the null subcarrier defined in the OFDMA RU allocation of 802.11ax does not need to be used for the purpose of not transmitting data.

The first NCCB band and the second NCCB band may be generated based on an orthogonal frequency division multiple access (OFDMA) tone allocation of an 802.11ax system. However, the minimum RU unit for performing the NCCB may correspond to 20 MHz (or 242 RU).

Hereinafter, signaling information for performing the NCCB will be described in detail.

The first information may further include NCCB indication information on whether or not NCCB can be performed. For example, the NCCB indication information may be set to 1 if the NCCB transmission can be performed, and the NCCB indication information may be set to 0 if the MU transmission of 802.11ax can be simply performed.

The first information may further include NCCB bandwidth information of a band to be used for transmitting the PPDU among the first NCCB band and the second NCCB band. If the first information is set to the first value, the band to be used for transmitting the data may be determined as the first NCCB. If the first information is set to a second value, a band to be used for transmitting the data may be determined as the second NCCB.

In addition, the second information may be included in resource unit (RU) allocation information in a common field of the HE-SIG B.

When the band to be used for transmitting the data is determined as the first NCCB, the third information may be set as bit information of 01111y2y1y0 for the 80MHz band. The bit information of 01111y2y1y0 may include channel allocation information of the 40 MHz or 60 MHz band. That is, the number of cases of NCCBs in up to eight 80 MHz bands may be indicated through y2y1y0 of the eight bits. In fact, since the number of NCCBs in the 80 MHz band is five, it can be sufficiently indicated through the bit information of 01111y2y1y0.

When the band to be used for transmitting the data is determined as the second NCCB, the third information may be set to bit information of 111x4x3x2x1x0 per 80MHz for the 160MHz band. The bit information of 111x4x3x2x1x0 may include allocation information per 80 MHz for channel allocation in the 80 MHz, 100 MHz, 120 MHz, or 140 MHz band. That is, x4x3x2x1x0 bits may be used for the first 80 MHz band of the 160 MHz band, and x4x3x2x1x0 bits may be used for the second 80 MHz band, so that the total number of cases of NCCBs in the 160 MHz band of 1024 (32 * 32) Can be directed. In fact, since the number of NCCBs in the 160 MHz band is 64, it can be sufficiently indicated through the two 111x4x3x2x1x0 bit information.

The 01111y2y1y0 and the 111x4x3x2x1x0 may be included in a reserved bit of the RU allocation information.

In addition, the AP may transmit physical capability information to the STA to perform the NCCB.

The physical capability information may include third information, fourth information, and fifth information.

The third information may be NCCB support information (NCCB support field) on whether the NCCB can be supported.

The fourth information may be channel bandwidth information (Channel width set field) of a continuous or discontinuous channel at 2.4 GHz and 5 GHz frequencies. The channel bandwidth information may also include channel bandwidths for the first NCCB band and the second NCCB band.

The fifth information may be information on a 20 MHz band punctured in the 80 MHz band and the 160 MHz band (Punctured preamble RX field). The first NCCB band and the second NCCB band may be generated except for the punctured 20 MHz band.

According to the above method, the NCCB can be used to smoothly perform wideband transmission of the STA, increase channel efficiency of the WLAN system, and improve throughput of the STA. In addition, by using 26 RUs limited at the boundary of the NCCB band, it is possible to reduce the influence of interference received by other channels in the NCCB band.

3. Device Configuration

24 is a diagram for explaining an apparatus for implementing the method as described above.

The wireless device 100 of FIG. 24 is a transmission device capable of implementing the above-described embodiment and may operate as an AP STA. The wireless device 150 of FIG. 24 is a reception device capable of implementing the above-described embodiment and may operate as a non-AP STA.

The transmitter 100 may include a processor 110, a memory 120, and a transceiver 130, and the receiver device 150 may include a processor 160, a memory 170, and a transceiver 180. can do. The transceiver 130 and 180 may transmit / receive a radio signal and may be executed in a physical layer such as IEEE 802.11 / 3GPP. The processors 110 and 160 are executed in the physical layer and / or the MAC layer and are connected to the transceivers 130 and 180.

The processors 110 and 160 and / or the transceivers 130 and 180 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processors. The memory 120, 170 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage unit. When an embodiment is executed by software, the method described above can be executed as a module (eg, process, function) that performs the functions described above. The module may be stored in the memories 120 and 170 and may be executed by the processors 110 and 160. The memories 120 and 170 may be disposed inside or outside the processes 110 and 160, and may be connected to the processes 110 and 160 by well-known means.

The processors 110 and 160 may implement the functions, processes, and / or methods proposed herein. For example, the processors 110 and 160 may perform operations according to the above-described embodiment.

The operation of the processor 110 of the transmitter is specifically as follows. The processor 110 of the transmitting apparatus generates and transmits allocation information for an RU for performing the NCCB, and transmits data to the STA through the NCCB based on the allocation information for the RU.

The operation of the processor 160 of the receiving apparatus is as follows. The processor 160 of the receiving device receives allocation information about the RU from the AP, and receives and decodes data through the corresponding NCCB based on the allocation information about the RU.

25 illustrates a more detailed wireless device implementing an embodiment of the present invention. The present invention described above with respect to the transmitting apparatus or the receiving apparatus can be applied to this embodiment.

The wireless device includes a processor 610, a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, a transceiver 630. ), One or more antennas 631, speakers 640, and microphones 641.

Processor 610 may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of the air interface protocol may be implemented in the processor 610. The processor 610 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The processor may be an application processor (AP). The processor 610 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of processor 610 include SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, A Series processors manufactured by Apple®, HELIOTM series processors manufactured by MediaTek®, INTEL® It may be an ATOMTM series processor or a corresponding next generation processor manufactured by.

The power management module 611 manages power of the processor 610 and / or the transceiver 630. The battery 612 supplies power to the power management module 611. The display 613 outputs the result processed by the processor 610. Keypad 614 receives input to be used by processor 610. Keypad 614 may be displayed on display 613. SIM card 615 is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and its associated keys used to identify and authenticate subscribers in mobile phone devices such as mobile phones and computers. You can also store contact information on many SIM cards.

The memory 620 is operatively coupled with the processor 610 and stores various information for operating the processor 610. The memory 620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. When an embodiment is implemented in software, the techniques described herein may be implemented as modules (eg, procedures, functions, etc.) that perform the functions described herein. The module may be stored in the memory 620 and executed by the processor 610. The memory 620 may be implemented inside the processor 610. Alternatively, the memory 620 may be implemented outside the processor 610 and communicatively connected to the processor 610 through various means known in the art.

The transceiver 630 is operatively coupled with the processor 610 and transmits and / or receives a radio signal. The transceiver 630 includes a transmitter and a receiver. The transceiver 630 may include a baseband circuit for processing radio frequency signals. The transceiver controls one or more antennas 631 to transmit and / or receive wireless signals.

The speaker 640 outputs a sound related result processed by the processor 610. The microphone 641 receives a sound related input to be used by the processor 610.

In the case of a transmitting apparatus, the processor 610 generates and transmits allocation information for an RU for performing an NCCB, and transmits data to an STA through an NCCB based on the allocation information for the RU.

In the case of a receiving apparatus, the processor 610 of the receiving apparatus receives the allocation information on the RU from the AP, and receives and decodes the data through the corresponding NCCB based on the allocation information on the RU.

The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band. That is, when the entire band is 80 MHz, the first NCCB band may generate a 40 MHz band or a 60 MHz band by bonding discontinuous 20 MHz bands to each other. When generating a 60 MHz band, a specific 20 MHz band may be adjacent to each other. In the 80 MHz band, the number of cases in which 40 MHz and 60 MHz bands are generated by the NCCB may be five.

The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band. That is, when the entire band is 160 MHz, the second NCCB band may bond the discontinuous 20 MHz bands to each other to generate an 80 MHz band, generate a 100 MHz band, generate a 120 MHz band, or generate a 140 MHz band. The number of cases where 80 MHz, 100 MHz, 120 MHz, and 140 MHz are generated by the NCCB in the 160 band may be 64 in total.

The allocation information for the RU includes first information and second information.

The first information includes channel allocation information of the first NCCB band or the second NCCB band.

When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. .

In this case, the first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands. The first 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a first band except for the first 26 RU in the first NCCB band.

When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. . The second 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the fifth to twelfth 20 MHz bands. The second 26 RU is a resource unit consisting of 26 tones.

That is, the data may be transmitted in a second band except for the second 26 RU in the second NCCB band.

The first 26 RU and the second 26 RU may be punctured. This is to reduce the effect of interference on other channels by puncturing 26 RUs included in the boundary with other bands for coexistence with other bands other than the band for performing the NCCB.

A specific embodiment of tone allocation of the first 26 RU and the second 26 RU is as follows.

First, when data is transmitted through the first NCCB band, tone allocation positions of the first 26 RUs are as follows.

The first to fourth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 80 MHz band.

When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, the first 26 RU may be included in a boundary of the first 20 MHz band and a boundary of the fourth 20 MHz band. have. In this case, a boundary of the first 20 MHz band may be adjacent to the second 20 MHz band, and a boundary of the fourth 20 MHz band may be adjacent to the third 20 MHz band.

Assuming that the 80 MHz band includes only 26 RU, the 80 MHz band may consist of 37 26 RUs (including center 26 RU). Accordingly, the first 26 RU included in the boundary of the first 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU. The first 26 RU included in the boundary of the fourth 20 MHz band may be a 29 th 26 RU.

In addition, when the data is transmitted through the second NCCB band, the tone allocation position of the second 26 RU is as follows.

The fifth to twelfth 20 MHz bands may be arranged in the order of low frequency to high frequency in the 160 MHz band.

When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, the second 26 RU may be bounded by the fifth 20 MHz band, bounded by the seventh 20 MHz band, and the second NCCB band. 9 may be included in the boundary of the 20MHz band. The boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, the boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, and the boundary of the ninth 20 MHz band is different from the tenth 20 MHz band. May be adjacent.

Assuming that the 160 MHz band includes only 26 RU, the 160 MHz band may consist of 37 26 RUs in the first 80 MHz band and 37 26 RUs in the second 80 MHz band (including center 26 RU). Accordingly, the second 26 RU included in the boundary of the fifth 20 MHz band (assuming that the 26 RU corresponding to the lowest frequency is the first 26 RU) may be the ninth 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the seventh 20 MHz band may be the 19 th 26 RU of the first 80 MHz band. The second 26 RU included in the boundary of the ninth 20 MHz band may be the ninth 26 RU of the second 80 MHz band.

In addition, the allocation information for the RU may further include third information. The third information may further include allocation information for a null subcarrier included in the first NCCB band or the second NCCB band. The null subcarrier may be used for transmission of the data. This is because, when performing NCCB, the null subcarrier defined in the OFDMA RU allocation of 802.11ax does not need to be used for the purpose of not transmitting data.

The first NCCB band and the second NCCB band may be generated based on an orthogonal frequency division multiple access (OFDMA) tone allocation of an 802.11ax system. However, the minimum RU unit for performing the NCCB may correspond to 20 MHz (or 242 RU).

Claims (15)

In the method for transmitting data in a WLAN system, Transmitting, by an access point (AP), allocation information on a resource unit (RU) to a station (STA); And The AP transmitting data to the STA through a first non-continuous channel bonding (NCCB) band or a second NCCB band based on allocation information on the RU; The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band, Allocation information for the RU includes first information and second information, The first information includes channel allocation information of the first NCCB band or the second NCCB band, When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. , The first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands, and The first 26 RU is a resource unit consisting of 26 tones Way. The method of claim 1, The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band, When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. , The second 26 RU is an RU adjacent to the remaining bands not discontinuously bonded in the fifth to twelfth 20 MHz bands, and The second 26 RU is a resource unit consisting of 26 tones Way. The method of claim 2, The data is transmitted on a first band except for the first 26 RU in the first NCCB band, or The data is transmitted in a second band except for the second 26 RU in the second NCCB band. Way. The method of claim 3, The first 26 RU and the second 26 RU are puncturing. Way. The method of claim 1, The first to fourth 20MHz bands are arranged in the order of low frequency to high frequency in the 80MHz band, When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, The first 26 RU is included at the boundary of the first 20 MHz band and the boundary of the fourth 20 MHz band, A boundary of the first 20 MHz band is adjacent to the second 20 MHz band, The boundary of the fourth 20 MHz band is adjacent to the third 20 MHz band. Way. The method of claim 2, The fifth to twelfth 20 MHz bands are arranged in the order of low frequency to high frequency in the 160 MHz band, When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, The second 26 RU is included at a boundary of the fifth 20 MHz band, a boundary of the seventh 20 MHz band, and a boundary of the ninth 20 MHz band, A boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, A boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, The boundary of the ninth 20 MHz band is adjacent to the tenth 20 MHz band. Way. The method of claim 1, Allocation information for the RU further includes third information, The third information further includes allocation information for a null subcarrier included in the first NCCB band or the second NCCB band. The null subcarrier is used for the transmission of the data. Way. The method of claim 1, The first NCCB band and the second NCCB band are generated based on an orthogonal frequency division multiple access (OFDMA) tone allocation of an 802.11ax system. Way. In an access point (AP) for transmitting data in a WLAN system, Memory; Transceiver; And A processor operatively coupled with the memory and the transceiver, the processor comprising: Transmitting allocation information on a resource unit (RU) to a station (STA); And And transmitting data to the STA through a first non-continuous channel bonding (NCCB) band or a second NCCB band based on allocation information about the RU. The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band, Allocation information for the RU includes first information and second information, The first information includes channel allocation information of the first NCCB band or the second NCCB band, When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. , The first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands, and The first 26 RU is a resource unit consisting of 26 tones Wireless device. The method of claim 9, The second NCCB band is an 80 MHz, 100 MHz, 120 MHz, or 140 MHz band generated by discontinuously bonding some of the fifth to twelfth 20 MHz bands included in the 160 MHz band, When the data is transmitted through the second NCCB band, the second information includes information that a second 26 RU included in some bands that are discontinuously bonded among the fifth to twelfth 20 MHz bands is not allocated. , The second 26 RU is an RU adjacent to the remaining bands not discontinuously bonded in the fifth to twelfth 20 MHz bands, and The second 26 RU is a resource unit consisting of 26 tones Wireless device. The method of claim 10, The data is transmitted on a first band except for the first 26 RU in the first NCCB band, or The data is transmitted in a second band except for the second 26 RU in the second NCCB band. Wireless device. The method of claim 11, The first 26 RU and the second 26 RU are puncturing. Wireless device. The method of claim 9, The first to fourth 20MHz bands are arranged in the order of low frequency to high frequency in the 80MHz band, When the first NCCB band is generated by bonding the first 20 MHz band and the fourth 20 MHz band, The first 26 RU is included at the boundary of the first 20 MHz band and the boundary of the fourth 20 MHz band, A boundary of the first 20 MHz band is adjacent to the second 20 MHz band, The boundary of the fourth 20 MHz band is adjacent to the third 20 MHz band. Wireless device. The method of claim 10, The fifth to twelfth 20 MHz bands are arranged in the order of low frequency to high frequency in the 160 MHz band, When the second NCCB band is generated by bonding the fifth 20 MHz band and the seventh to ninth 20 MHz bands, The second 26 RU is included at a boundary of the fifth 20 MHz band, a boundary of the seventh 20 MHz band, and a boundary of the ninth 20 MHz band, A boundary of the fifth 20 MHz band is adjacent to the sixth 20 MHz band, A boundary of the seventh 20 MHz band is adjacent to the sixth 20 MHz band, The boundary of the ninth 20 MHz band is adjacent to the tenth 20 MHz band. Wireless device. In the method for receiving data in a WLAN system, Receiving, by a station (STA), allocation information for a resource unit (RU) from an access point (AP); Receiving, by the STA, data from the AP through a first Non-Continuous Channel Bonding (NCCB) band or a second NCCB band based on allocation information about the RU, The first NCCB band is a 40 MHz or 60 MHz band generated by discontinuously bonding some of the first to fourth 20 MHz bands included in the 80 MHz band, Allocation information for the RU includes first information and second information, The first information includes channel allocation information of the first NCCB band or the second NCCB band, When the data is transmitted through the first NCCB band, the second information includes information that a first 26 RU included in some bands that are discontinuously bonded among the first to fourth 20 MHz bands is not allocated. , The first 26 RU is an RU adjacent to the remaining bands that are not discontinuously bonded among the first to fourth 20 MHz bands, and The first 26 RU is a resource unit consisting of 26 tones Way.

Images