Method and device for transmitting data for plurality of stations through plurality of bands in wireless LAN system

• US 10,461,901 B2
• Filed: 01/22/2016
• Issued: 10/29/2019
• Est. Priority Date: 01/22/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jinsoo, Cho, Hangyu, Lee, Wookbong, Ryu, Kiseon
• Primary Examiner(s): Renner, Brandon M
• Assistant Examiner(s): Vogel, Jay L
• Application Number:
  US15/545,664
• Publication Number:
  US 20180006781A1
• Time in Patent Office: 1,376 Days
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2628 Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators H04L27/2634 takes precedence
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Proposed are a method and a device for transmitting a signal including a data field in a wireless LAN. For example, an access point (AP) allocates, to a second station, a second frequency band adjacent to a first frequency band, wherein the second frequency band can include a plurality of resource units. In addition, a signal including the data field can be transmitted to the second station through the allocated second frequency band. Furthermore, when the first frequency band is allocated to the first station, the AP can allocate, to the second station, as a null resource unit, a resource unit adjacent to the first frequency band among the plurality of resource units.

Claims

1. A method for transmitting a signal in a wireless LAN, comprising:

allocating, by an access point (AR) including in a first basic service set (BSS), a first frequency band and a second frequency band,

wherein a non-contiguous band exits between the first and second frequency band,

wherein the non-contiguous band is overlapped with a hearable interfering source that can

be received from a second BSS, and

wherein the second BSS is an overlapping basic service set (QBSS) for the first BSS; and

transmitting, by the AR, a first signal to a first station through the first frequency band and a second signal to a second station through the second frequency band,

wherein a first leftover tone is inserted in a resource unit (RU) closest to the non contiguous band in the first frequency band,

wherein a second leftover tone is inserted in a RU closest to the non-contiguous band in

the second frequency band,

wherein the first and second leftover tones have 8 tones respectively,

wherein a first frequency resource through which the first signal is transmitted in the first frequency band has 234 tones, and

wherein a second frequency resource through which the second signal is transmitted in the second frequency band has 234 tones.

2. The method of claim 1, wherein a neighboring AP is included in the second BSS.

3. The method of claim 1, wherein each of the first frequency band and the second frequency band relates to a 20 MHz bandwidth.

4. The method of claim 1, wherein, in case the AP allocates a third frequency band being adjacent to the second frequency band to a third station, among a plurality of resource units being included in the third frequency band, a resource unit being adjacent to the second frequency band is used as a data signal for the third station, and

in case a neighboring AP allocates a third frequency band being adjacent to the second frequency band to the third station, among a plurality of resource units being included in the third frequency band, a resource unit being adjacent to the second frequency band is allocated as a null resource unit.

5. The method of claim 1, wherein the first signal or the second signal is included in a PPDU including a first part and a second part, wherein a first part of the PPDU is configured by a first point FFT calculation, wherein a second part of the PPDU is configured by a second point IFFT calculation, and wherein frequency bandwidths of the first part of the PPDU and the second part of the PPDU are configured to be equal to one another.

6. The method of claim 1,

wherein a control signal and a training signal is transmitted through the first and second leftover tones, and

wherein the first signal, the second signal, the control signal and the training signal are not transmitted through the null resource unit.

7. An access point (AP) included in a first basic service set (BSS) for transmitting a signal in a wireless LAN, the AP comprising:

a radio frequency (RF) unit transmitting and receiving radio signals; and

a processor being operatively connected to the RF unit,

wherein the processor is configured to;

allocate a first frequency band and a second frequency band,

wherein a non-contiguous band exits between the first and second frequency band,

wherein the non-contiguous band is overlapped with a hearable interfering source

that can be received from a second BSS, and

wherein the second BSS is an overlapping basic service set (QBSS) for the first BSS; and

transmit a first signal to a first station through the first frequency band and a

second signal to a second station through the second frequency band,

wherein a first leftover tone is inserted in a resource unit (RU) closest to the non contiguous band in the first frequency band,

wherein a second leftover tone is inserted in a RU closest to the non-contiguous band in the second frequency band,

wherein the first and second leftover tones have 8 tones respectively,

wherein a first frequency resource through which the first signal is transmitted in the first frequency band has 234 tones, and

wherein a second frequency resource through which the second signal is transmitted in the second frequency band has 234 tones.

8. The AP of claim 7, wherein a neighboring AP is included in the second BSS.

9. The AP of claim 7, wherein each of the first frequency band and the second frequency band relates to a 20 MHz bandwidth.

10. The AP of claim 7, wherein, in case the AP allocates a third frequency band being adjacent to the second frequency band to a third station, among a plurality of resource units being included in the third frequency band, a resource unit being adjacent to the second frequency band is used as a data signal for the third station, and

in case a neighboring AP allocates a third frequency band being adjacent to the second frequency band to the third station, among a plurality of resource units being included in the third frequency band, a resource unit being adjacent to the second frequency band is allocated as a null resource unit.

11. The AP of claim 7, wherein the first signal or the second signal is included in a PPDU including a first part and a second part, wherein a first part of the PPDU is configured by a first point FFT calculation, wherein a second part of the PPDU is configured by a second point IFFT calculation, and wherein frequency bandwidths of the first part of the PPDU and the second part of the PPDU are configured to be equal to one another.

12. The AP of claim 7,

wherein a control signal and a training signal is transmitted through the first and second leftover tones, and

wherein first signal, the second signal, the control signal and the training signal are not transmitted through the null resource unit.