METHOD FOR TRANSMITTING AND RECEIVING FRAME

• US 20150334708A1
• Filed: 05/08/2015
• Published: 11/19/2015
• Est. Priority Date: 05/09/2014
• Status: Active Grant

• Current Assignee: Atlas Global Technologies LLC (Acacia Research Corporation)
• Original Assignee: Newracom Inc.
• Inventors: LEE, ILGU, YU, Changwahn
• Granted Patent: US 10,057,899 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A frame transmission method is provided by a device in a wireless communication network. The device generates a signal field including a symbol using a 64 FFT and carrying signaling information, and generates a data field including a symbol using a FFT having a larger size than the 64 FFT and carrying data. The device transmits a frame including the signal field and the data field.

Claims

1. A method of transmitting a frame by a device in a wireless communication network, the method comprising:

generating a first signal field including a symbol having first subcarrier spacing, the first signal field carrying signaling information;

generating a data field including a symbol having the second subcarrier spacing narrower than the first subcarrier spacing, the data field carrying data; and

transmitting a frame including the first signal field and the data field.

2. The method of claim 1, wherein the second subcarrier spacing is ¼

of the first subcarrier spacing.

3. The method of claim 1, wherein an FFT period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing.

4. The method of claim 3, wherein a set of allowable guard intervals for the symbol having the second subcarrier spacing includes 0.8 μ

s, 1.6 μ

s, and 3.2 μ

s.

5. The method of claim 1, further comprising generating a long training field following the first signal field and used for channel estimation,

wherein the long training field includes a symbol having the second subcarrier spacing.

6. The method of claim 1, wherein an entire bandwidth is divided in to a plurality of bands each having a predetermined bandwidth,

wherein the first signal is duplicated and transmitted on the plurality of bands, and

wherein the entire bandwidth is divided into a plurality of resource blocks for a plurality of users in the data field, and a bandwidth narrower than the predetermined bandwidth is allowed for the plurality of resource blocks.

7. The method of claim 6, further comprising a legacy preamble preceding the first signal field and being compatible with a previous version wireless communication network,

wherein the legacy preamble includes a short training field, a long training field, and a second signal field, and

wherein the short training field, the long training field, and the second signal field are duplicated and transmitted on the plurality of bands.

8. A method of transmitting a frame by a device in a wireless communication network, the method comprising:

dividing a band into a plurality of subbands;

transmitting on the band a first part including a legacy preamble compatible with a previous version wireless communication network and a signal field carrying signaling information; and

transmitting a second part including a data field carrying data on a corresponding subband among the plurality of subbands.

9. The method of claim 8, wherein the second part further includes a long training field following the signal field and used for channel estimation.

10. The method of claim 8, wherein the first part further includes a short training field following the signal field and used for an automatic gain control.

11. The method of claim 8, wherein a symbol of the first part and a symbol of the second part have the same subcarrier spacing.

12. The method of claim 8, wherein subcarrier spacing of a symbol of the second part is narrower than subcarrier spacing of a symbol of the second part.

13. The method of claim 12, wherein a first FFT is used in the first part and a second FFT having the larger size than the first FFT is used in the second part.

14. The method of claim 12, further comprising allocating pilots to the second part to allow a phase tracking to be performed by a symbol period unit including a plurality of consecutive symbols.

15. A method of receiving a frame by a device in a wireless communication network, the method comprising:

receiving a first part having first subcarrier spacing and including a first signal carrying signaling information;

decoding a symbol of the first part on a basis of the first subcarrier spacing;

receiving a second part having second subcarrier spacing narrower than the first subcarrier spacing and including a data signal carrying data; and

decoding a symbol of the second part on a basis of the second subcarrier spacing.

16. The method of claim 15, wherein the second subcarrier spacing is ¼

of the first subcarrier spacing.

17. The method of claim 15, wherein an FFT period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing.

18. The method of claim 15, wherein a set of allowable guard intervals for the symbol having the second subcarrier spacing includes 0.8 μ

s, 1.6 μ

s, and 3.2 μ

s.

19. The method of claim 15, wherein receiving the first part includes receiving the first part on a band which is assigned to the device, and

receiving the second part includes receiving the second part on a subband that corresponds to the device among a plurality of subbands into which the band is divided.

20. The method of claim 18, further comprising performing a phase tracking by extracting pilots by a symbol period unit including a plurality of consecutive symbols.