PROTECTION METHODS FOR WIRELESS TRANSMISSIONS

• US 20170230155A1
• Filed: 04/25/2017
• Published: 08/10/2017
• Est. Priority Date: 10/12/2015
• Status: Active Grant

• Current Assignee: Atlas Global Technologies LLC (Acacia Research Corporation)
• Original Assignee: Newracom Inc.
• Inventors: LEE, Dae Won, NOH, Yujin, MOON, Sungho, KWON, Young Hoon, HEDAYAT, Ahmad Reza
• Granted Patent: US 10,020,919 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless device receives a Multi-User Request-To-Send (MU-RTS) frame, descrambles first scrambled data in the MU-RTS frame using a first scrambling sequence, generates second scrambled data using a second scrambling sequence, and transmits a Clear-to-Send (CTS) frame including the second scrambled data in response to receiving the MU-RTS frame. The second scrambling sequence is an N-bit left cyclic shift of the first scrambling sequence. Another wireless device generates first scrambled data using a first scrambling sequence and transmits an MU-RTS frame including the first scrambled data. The wireless device receives a CTS frame transmitted in response to the MU-RTS frame, and descrambles second scrambled data in the CTS frame using a second scrambling sequence. The second scrambling sequence is an N-bit left cyclic shift of the first scrambling sequence. In either device, N may be 7, and lengths of the first and second scrambling sequences may be 127 bits.

Claims

1. A method performed by a wireless device, the method comprising:

receiving a Null Data Packet Announcement (NDPA), the NDPA including one or more station information fields;

determining a number of the one or more station information fields in the NDPA;

receiving a Null Data Packet (NDP); and

when the number of the one or more station information fields in the NDPA is one, transmitting first Channel State Information (CSI) feedback in response to receiving the NDP.

2. The method of claim 1, further comprising:

when the number of the one or more station information fields in the NDPA is greater than one;

receiving a first trigger frame; and

transmitting the first CSI feedback in response to receiving the first trigger frame.

3. The method of claim 2, wherein transmitting the first CSI feedback in response to receiving the NDP comprises:

transmitting the first CSI feedback a first predetermined interframe space (IFS) after receiving the NDP.

4. The method of claim 3, wherein transmitting the first CSI feedback in response to receiving the first trigger frame comprises:

transmitting the first CSI feedback a second predetermined IFS after receiving the first trigger frame.

5. The method of claim 2, wherein transmitting the first CSI feedback in response to receiving the NDP comprises:

transmitting the first CSI feedback in a single user transmission in response to receiving the NDP.

6. The method of claim 5, wherein transmitting the first CSI feedback in response to receiving the first trigger frame comprises:

transmitting the first CSI feedback in a multi user transmission in response to receiving the first trigger frame.

7. The method of claim 6, wherein the first trigger frame comprises resource assignment information.

8. The method of claim 7, wherein transmitting the first CSI feedback in a multi user transmission comprises:

participating in the multi user transmission based on the resource assignment information to transmit the first CSI feedback in response to receiving the first trigger frame.

9. The method of claim 2, further comprising:

when the number of one or more station information fields in the NDPA is greater than one;

receiving a second trigger frame; and

transmitting second CSI feedback in response to receiving the second trigger frame.

10. The method of claim 1, further comprising:

receiving a sounding poll frame; and

transmitting the first CSI feedback in response to receiving the sounding poll frame.

11. A method performed by a wireless device, the method comprising:

transmitting a Null Data Packet Announcement (NDPA), the NDPA including one or more station information fields;

transmitting a Null Data Packet (NDP); and

when a number of the one or more station information fields in the NDPA is one, receiving first Channel State Information (CSI) feedback in response to transmitting the NDP.

12. The method of claim 11, further comprising:

when the number of the one or more station information fields in the NDPA is greater than one;

transmitting a first trigger frame; and

receiving the first CSI feedback in response to transmitting the first trigger frame.

13. The method of claim 12, wherein receiving the first CSI feedback in response to transmitting the NDP comprises:

receiving the first CSI feedback a first predetermined interframe space (IFS) after transmitting the NDP.

14. The method of claim 13, wherein receiving the first CSI feedback in response to transmitting the first trigger frame comprises:

receiving the first CSI feedback a second predetermined IFS after transmitting the first trigger frame.

15. The method of claim 12, wherein receiving the first CSI feedback in response to transmitting the NDP comprises:

receiving the first CSI feedback in a single user transmission in response to transmitting the NDP.

16. The method of claim 15, wherein receiving the first CSI feedback in response to transmitting the first trigger frame comprises:

receiving the first CSI feedback in a multi user transmission in response to transmitting the first trigger frame.

17. The method of claim 16, wherein the first trigger frame comprises resource assignment information.

18. The method of claim 17, wherein receiving the first CSI feedback in a multi user transmission comprises:

participating in the multi user transmission based on the resource assignment information to receive the first CSI feedback in response to transmitting the first trigger frame.

19. The method of claim 12, further comprising:

when the number of one or more station information fields in the NDPA is greater than one;

transmitting a second trigger frame; and

receiving second CSI feedback in response to transmitting the second trigger frame.

20. The method of claim 11, further comprising:

transmitting a sounding poll frame; and

receiving the first CSI feedback in response to transmitting the sounding poll frame.