Multiuser transreceiving method in wireless communication system and device for same

• US 10,200,175 B2
• Filed: 11/02/2015
• Issued: 02/05/2019
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Eunsung, Choi, Jinsoo, Lim, Dongguk, Cho, Hangyu, Lee, Wookbong
• Primary Examiner(s): Choudhury, Faisal
• Application Number:
  US15/523,275
• Publication Number:
  US 20170338928A1
• Time in Patent Office: 1,191 Days
• Field of Search: 370338
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for transmitting data from a station (STA) device in a wireless LAN (WLAN) system, according to one embodiment of the present invention, comprises the steps of: generating a physical protocol data unit (PPDU) including a physical preamble and a data field; and transmitting the PPDU, wherein when the data field is transmitted by using a 106-tone resource unit including first to fourth pilot tones, the positions of the first to the fourth pilot tones may be identical to the positions of four pilot tones from among eight pilot tones included in four 26-tone resource units, which are present at a position corresponding to the 106-tone resource unit, or identical to the positions of four pilot tones from among eight pilot tones included in two 52-tone resource units, which are present at a position corresponding to the 106-tone resource unit.

Claims

1. A data transmission method of a station (STA) in a wireless local area network (LAN) (WLAN) system, comprising:

generating a physical protocol data unit (PPDU) including a physical preamble and a data field; and

transmitting the PPDU,

when the data field is transmitted within a bandwidth including a 106-tone resource unit including first to fourth pilot tones,

wherein positions of the first to fourth pilot tones correspond to positions of 4 pilot tones from among 8 pilot tones included in 4 26-tone resource units at positions corresponding to the 106-tone resource unit or correspond to positions of 4 pilot tones from among 8 pilot tones included in 2 52-tone resource units at positions corresponding to the 106-tone resource unit.

2. The data transmission method according to claim 1,

wherein the position of the first pilot tone corresponds to a position of one of 2 pilot tones included in the first 26-tone resource unit,

wherein the position of the second pilot tone corresponds to a position of one of 2 pilot tones included in the second 26-tone resource unit,

wherein the position of the third pilot tones corresponds to a position of one of 2 pilot tones included in the third 26-tone resource unit, and

wherein the position of the fourth pilot tones corresponds to a position of one of 2 pilot tones included in the fourth 26-tone resource unit.

3. The data transmission method according to claim 2, wherein a first pilot sequence {1 1 1-1} is applied to the first to fourth pilot tones.

4. The data transmission method according to claim 3, wherein, when 26 tones included in each 26-tone resource unit are sequentially positioned at indices 0 to 25, 2 pilot tones included in each 26-tone resource unit are respectively positioned at the indices 6 and 20.

5. The data transmission method according to claim 4, wherein, when 106 tones included in the 106-tone resource unit are sequentially positioned at indices 0 to 105, the first pilot tone is positioned at the index 6, the second pilot tone is positioned at the index 32, the third pilot tone is positioned at the index 74, and the fourth pilot tone is positioned at the index 100.

6. The data transmission method according to claim 3, wherein, when 26 tones included in each 26-tone resource unit are sequentially positioned at indices 0 to 25, 2 pilot tones included in each 26-tone resource unit are respectively positioned at the indices 5 and 19.

7. The data transmission method according to claim 6, wherein, when 106 tones included in the 106-tone resource unit are sequentially positioned at indices 0 to 105, the first pilot tone is positioned at the index 5, the second pilot tone is positioned at the index 31, the third pilot tone is positioned at the index 73, and the fourth pilot tone is positioned at the index 99.

8. The data transmission method according to claim 1, when the data field is transmitted using a 996-tone resource unit including first to sixteenth pilot tones, and

wherein a second pilot sequence {1 1 1 −

1 −

1 1 1 1 1 1 1 −

1 −

1 1 1 1} is applied to the first to sixteenth pilot tones.

9. The data transmission method according to claim 1,

wherein the bandwidth includes two 106-tone resource units,

when the two 106-tone resource units include the first to fourth pilot tones respectively and 106 tones included in the 106-tone resource unit are positioned at indices 0 to 105 sequentially:

wherein, in one 106-tone resource unit, the first pilot tone is positioned at the index 6, the second pilot tone is positioned at the index 32, the third pilot tone is positioned at the index 74, and the fourth pilot tone is positioned at the index 100, and

wherein, in another 106-tone resource unit, the first pilot tone is positioned at the index 5, the second pilot tone is positioned at the index 31, the third pilot tone is positioned at the index 73, and the fourth pilot tone is positioned at the index 99.

10. The data transmission method according to claim 9, wherein the two 106-tone resource units are symmetrically located with DC tones as a center in the bandwidth.

11. The data transmission method according to claim 9,

when the bandwidth is a 20 MHz bandwidth:

wherein the 20 MHz includes 6 left guard tones, a first 106-tone resource unit, a first 13-tone resource unit, 7 DC (Direct Current) tones, a second 13-tone resource unit, a second 106-tone resource unit and 5 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 7 DC tones, indices from +1 to +127 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

128 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

116, the second pilot tone is positioned at the index −

90, the third pilot tone is positioned at the index −

48, and the fourth pilot tone is positioned at the index −

22, and

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index +22, the second pilot tone is positioned at the index +48, the third pilot tone is positioned at the index +90, and the fourth pilot tone is positioned at the index +116.

12. The data transmission method according to claim 11, wherein the first 106-tone resource unit corresponds to the one 106-tone resource unit, and the second 106-tone resource unit corresponds to the another 106-tone resource unit.

13. The data transmission method according to claim 9,

when the bandwidth is a 40 MHz bandwidth:

wherein the 40 MHz includes 12 left guard tones, 1 leftover tone, a first 106-tone resource unit, 1 leftover tone, a first 26-tone resource unit, 1 leftover tone, a second 106-tone resource unit, 1 leftover tone, 5 DC (Direct Current) tones, 1 leftover tone, a third 106-tone resource unit, 1 leftover tone, a second 26-tone resource unit, 1 leftover tone, a fourth 106-tone resource unit, 1 leftover tone, and 11 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 5 DC tones, indices +1 to +255 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

256 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

238, the second pilot tone is positioned at the index −

212, the third pilot tone is positioned at the index −

170, and the fourth pilot tone is positioned at the index −

144,

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index −

104, the second pilot tone is positioned at the index −

78, the third pilot tone is positioned at the index −

36, and the fourth pilot tone is positioned at the index −

10,

wherein, in the third 106-tone resource unit, the first pilot tone is positioned at the index +10, the second pilot tone is positioned at the index +36, the third pilot tone is positioned at the index +78, and the fourth pilot tone is positioned at the index +104, and

wherein, in the fourth 106-tone resource unit, the first pilot tone is positioned at the index +144, the second pilot tone is positioned at the index +170, the third pilot tone is positioned at the index +212, and the fourth pilot tone is positioned at the index +238.

14. The data transmission method according to claim 13, wherein the first and the second 106-tone resource units correspond to the another 106-tone resource unit, and the third and the fourth 106-tone resource units correspond to the one 106-tone resource unit.

15. The data transmission method according to claim 9,

when the bandwidth is a 80 MHz bandwidth:

wherein the 80 MHz includes 12 left guard tones, 1 leftover tone, a first 106-tone resource unit, 1 leftover tone, a first 26-tone resource unit, 1 leftover tone, a second 106-tone resource unit, 2 leftover tones, a third 106-tone resource unit, 1 leftover tone, a second 26-tone resource unit, 1 leftover tone, a fourth 106-tone resource unit, 1 leftover tone, a first 13-tone resource unit, 7 DC (Direct Current) tones, a second 13-tone resource unit, 1 leftover tone, a fifth 106-tone resource unit, 1 leftover tone, a third 26-tone resource unit, 1 leftover tone, a sixth 106-tone resource unit, 2 leftover tones, a seventh 106-tone resource unit, 1 leftover tone, a fourth 26- tone resource unit, 1 leftover tone, a eighth 106-tone resource unit, 1 leftover tone, and 11 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 5 DC tones, indices +1 to +511 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

512 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

494, the second pilot tone is positioned at the index −

468, the third pilot tone is positioned at the index −

426, and the fourth pilot tone is positioned at the index −

400,

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index −

360, the second pilot tone is positioned at the index −

334, the third pilot tone is positioned at the index −

292, and the fourth pilot tone is positioned at the index −

266,

wherein, in the third 106-tone resource unit, the first pilot tone is positioned at the index −

252, the second pilot tone is positioned at the index −

226, the third pilot tone is positioned at the index −

184, and the fourth pilot tone is positioned at the index −

158,

wherein, in the fourth 106-tone resource unit, the first pilot tone is positioned at the index −

118, the second pilot tone is positioned at the index −

92, the third pilot tone is positioned at the index −

50, and the fourth pilot tone is positioned at the index −

24,

wherein, in the fifth 106-tone resource unit, the first pilot tone is positioned at the index +24, the second pilot tone is positioned at the index +50, the third pilot tone is positioned at the index +92, and the fourth pilot tone is positioned at the index +118,

wherein, in the sixth 106-tone resource unit, the first pilot tone is positioned at the index +158, the second pilot tone is positioned at the index +184, the third pilot tone is positioned at the index +226, and the fourth pilot tone is positioned at the index +252,

wherein, in the seventh 106-tone resource unit, the first pilot tone is positioned at the index +266, the second pilot tone is positioned at the index +292, the third pilot tone is positioned at the index +334, and the fourth pilot tone is positioned at the index +360, and

wherein, in the eighth 106-tone resource unit, the first pilot tone is positioned at the index +400, the second pilot tone is positioned at the index +426, the third pilot tone is positioned at the index +468, and the fourth pilot tone is positioned at the index +494.

16. The data transmission method according to claim 15, wherein the first to the fourth 106-tone resource units correspond to the another 106-tone resource unit, and the fifth to the eighth 106-tone resource units correspond to the one 106-tone resource unit.

17. A station (STA) in a wireless local area network (LAN) (WLAN) system, comprising:

an RF unit configured to transmit and receive RF signals; and

a processor configured to control the RF unit,

wherein the processor is further configured to generate a physical protocol data unit (PPDU) including a physical preamble and a data field and to transmit the PPDU,

when the data field is transmitted within a bandwidth including a 106-tone resource unit including first to fourth pilot tones,

wherein positions of the first to fourth pilot tones correspond to positions of 4 pilot tones from among 8 pilot tones included in 4 26-tone resource units at positions corresponding to the 106-tone resource unit or correspond to positions of 4 pilot tones from among 8 pilot tones included in 2 52-tone resource units at positions corresponding to the 106-tone resource unit.

18. The STA according to claim 17, wherein a first pilot sequence {1 1 1−

1} is applied to the first to fourth pilot tones.

19. The STA according to claim 18, wherein, when 26 tones included in each 26-tone resource unit are sequentially positioned at indices 0 to 25, 2 pilot tones included in each 26-tone resource unit are respectively positioned at the indices 6 and 20.

20. The STA according to claim 18, wherein, when 26 tones include in each 26-tone resource unit are sequentially positioned at indices 0 to 25, 2 pilot tones included in each 26-tone resource unit are respectively positioned at the indices 5 and 19.

21. The STA according to claim 19, wherein, when 106 tones included in the 106-tone resource unit are sequentially positioned at indices 0 to 105, the first pilot tone is positioned at the index 6, the second pilot tone is positioned at the index 32, the third pilot tone is positioned at the index 74, and the fourth pilot tone is positioned at the index 100.

22. The STA according to claim 20, wherein, when 106 tones included in the 106-tone resource unit are sequentially positioned at indices 0 to 105, the first pilot tone is positioned at the index 5, the second pilot tone is positioned at the index 31, the third pilot tone is positioned at the index 73, and the fourth pilot tone is positioned at the index 99.

23. The STA according to claim 17, when the data field is transmitted using a 996-tone resource unit including first to sixteenth pilot tones, and

wherein a second pilot sequence {1 1 1 −

1 −

1 1 1 1 1 1 1 −

1 −

1 1 1 1} is applied to the first to sixteenth pilot tones.

24. The STA according to claim 17,

wherein the bandwidth includes two 106-tone resource units,

when the two 106-tone resource units include the first to fourth pilot tones respectively and 106 tones included in the 106-tone resource unit are positioned at indices 0 to 105 sequentially:

wherein, in one 106-tone resource unit, the first pilot tone is positioned at the index 6, the second pilot tone is positioned at the index 32, the third pilot tone is positioned at the index 74, and the fourth pilot tone is positioned at the index 100, and

wherein, in another 106-tone resource unit, the first pilot tone is positioned at the index 5, the second pilot tone is positioned at the index 31, the third pilot tone is positioned at the index 73, and the fourth pilot tone is positioned at the index 99.

25. The STA according to claim 24, wherein the first to fourth pilot tones in the one 106-tone resource unit and the first to fourth pilot tones in the another 106-tone resource unit are symmetrically located with DC tones as a center in the specific bandwidth.

26. The STA according to claim 24,

when the bandwidth is a 20 MHz bandwidth:

wherein the 20 MHz includes 6 left guard tones, a first 106-tone resource unit, a first 13-tone resource unit, 7 DC (Direct Current) tones, a second 13-tone resource unit, a second 106-tone resource unit and 5 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 7 DC tones, indices from +1 to +127 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

128 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

116, the second pilot tone is positioned at the index −

90, the third pilot tone is positioned at the index −

48, and the fourth pilot tone is positioned at the index −

22, and

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index +22, the second pilot tone is positioned at the index +48, the third pilot tone is positioned at the index +90, and the fourth pilot tone is positioned at the index +116.

27. The STA according to claim 26, wherein the first 106-tone resource unit corresponds to the one 106-tone resource unit, and the second 106-tone resource unit corresponds to the another 106-tone resource unit.

28. The STA according to claim 24,

when the bandwidth is a 40 MHz bandwidth:

wherein the 40 MHz includes 12 left guard tones, 1 leftover tone, a first 106-tone resource unit, 1 leftover tone, a first 26-tone resource unit, 1 leftover tone, a second 106-tone resource unit, 1 leftover tone, 5 DC (Direct Current) tones, 1 leftover tone, a third 106-tone resource unit, 1 leftover tone, a second 26-tone resource unit, 1 leftover tone, a fourth 106-tone resource unit, 1 leftover tone, and 11 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 5 DC tones, indices +1 to +255 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

256 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

238, the second pilot tone is positioned at the index −

212, the third pilot tone is positioned at the index −

170, and the fourth pilot tone is positioned at the index −

144,

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index −

104, the second pilot tone is positioned at the index −

78, the third pilot tone is positioned at the index −

36, and the fourth pilot tone is positioned at the index −

10,

wherein, in the third 106-tone resource unit, the first pilot tone is positioned at the index +10, the second pilot tone is positioned at the index +36, the third pilot tone is positioned at the index +78, and the fourth pilot tone is positioned at the index +104, and

wherein, in the fourth 106-tone resource unit, the first pilot tone is positioned at the index +144, the second pilot tone is positioned at the index +170, the third pilot tone is positioned at the index +212, and the fourth pilot tone is positioned at the index +238.

29. The STA according to claim 28, wherein the first and the second 106-tone resource units correspond to the another 106-tone resource unit, and the third and the fourth 106-tone resource units correspond to the one 106-tone resource unit.

30. The STA according to claim 24,

when the bandwidth is a 80 MHz bandwidth:

wherein the 80 MHz includes 12 left guard tones, 1 leftover tone, a first 106-tone resource unit, 1 leftover tone, a first 26-tone resource unit, 1 leftover tone, a second 106-tone resource unit, 2 leftover tones, a third 106-tone resource unit, 1 leftover tone, a second 26-tone resource unit, 1 leftover tone, a fourth 106-tone resource unit, 1 leftover tone, a first 13-tone resource unit, 7 DC (Direct Current) tones, a second 13-tone resource unit, 1 leftover tone, a fifth 106-tone resource unit, 1 leftover tone, a third 26-tone resource unit, 1 leftover tone, a sixth 106-tone resource unit, 2 leftover tones, a seventh 106-tone resource unit, 1 leftover tone, a fourth 26-tone resource unit, 1 leftover tone, a eighth 106-tone resource unit, 1 leftover tone, and 11 right guard tones, sequentially,

when an index 0 is allocated to a central DC tone among the 5 DC tones, indices +1 to +511 are sequentially allocated to tones located on a right side of the central DC tone in a right direction, and indices −

1 to −

512 are sequentially allocated to tones located on a left side of the central DC tone in a left direction;

wherein, in the first 106-tone resource unit, the first pilot tone is positioned at the index −

494, the second pilot tone is positioned at the index −

468, the third pilot tone is positioned at the index −

426, and the fourth pilot tone is positioned at the index −

400,

wherein, in the second 106-tone resource unit, the first pilot tone is positioned at the index −

360, the second pilot tone is positioned at the index −

334, the third pilot tone is positioned at the index −

292, and the fourth pilot tone is positioned at the index −

266,

wherein, in the third 106-tone resource unit, the first pilot tone is positioned at the index −

252, the second pilot tone is positioned at the index −

226, the third pilot tone is positioned at the index −

184, and the fourth pilot tone is positioned at the index −

158,

wherein, in the fourth 106-tone resource unit, the first pilot tone is positioned at the index −

118, the second pilot tone is positioned at the index −

92, the third pilot tone is positioned at the index −

50, and the fourth pilot tone is positioned at the index −

24,

wherein, in the fifth 106-tone resource unit, the first pilot tone is positioned at the index +24, the second pilot tone is positioned at the index +50, the third pilot tone is positioned at the index +92, and the fourth pilot tone is positioned at the index +118,

wherein, in the sixth 106-tone resource unit, the first pilot tone is positioned at the index +158, the second pilot tone is positioned at the index +184, the third pilot tone is positioned at the index +226, and the fourth pilot tone is positioned at the index +252,

wherein, in the seventh 106-tone resource unit, the first pilot tone is positioned at the index +266, the second pilot tone is positioned at the index +292, the third pilot tone is positioned at the index +334, and the fourth pilot tone is positioned at the index +360, and

wherein, in the eighth 106-tone resource unit, the first pilot tone is positioned at the index +400, the second pilot tone is positioned at the index +426, the third pilot tone is positioned at the index +468, and the fourth pilot tone is positioned at the index +494.

31. The STA according to claim 30, wherein the first to the fourth 106-tone resource units correspond to the another 106-tone resource unit, and the fifth to the eighth 106-tone resource units correspond to the one 106-tone resource unit.