Protection mechanism for multi-user transmission

• US 10,701,686 B1
• Filed: 06/15/2016
• Issued: 06/30/2020
• Est. Priority Date: 06/15/2015
• Status: Active Grant

• Current Assignee: Atlas Global Technologies LLC (Acacia Research Corporation)
• Original Assignee: Newracom Inc.
• Inventors: Kwon, Young Hoon, Noh, Yujin
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Reyes, Hector
• Application Number:
  US15/183,570
• Time in Patent Office: 1,476 Days
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Protecting a shared wireless channel for use by an access point may be accomplished by generating, by the access point, a control frame that is addressed to a plurality of wireless devices, wherein generating the control frame includes providing a group address in one or more fields of the control frame, and transmitting, by the access point, the control frame to the plurality of wireless devices, wherein the control frame solicits a Clear-to-Send frame from any wireless device in the plurality of wireless devices that satisfies a set of conditions, wherein each Clear-to-Send frame authorizes the access point to perform a downlink transmission on the shared wireless channel.

Claims

1. A method for protecting a shared wireless channel for use by an access point, the method comprising:

generating, by the access point, a control frame that is addressed to a plurality of wireless devices, includes first information, and solicits a response, the first information including an indication of a transmission bandwidth of the control frame;

transmitting, by the access point, the control frame to the plurality of wireless devices; and

receiving, by the access point, a plurality of Clear-to-Send frames respectively transmitted in response to the control frame by respective wireless devices in the plurality of wireless devices that satisfy a set of conditions, wherein each Clear-to-Send frame authorizes the access point to perform a downlink transmission on the shared wireless channel, and wherein each Clear-to-Send frame is received at a same time and on a same frequency resource,

wherein the plurality of Clear-to-Send frames are RF-combined,

wherein each of the Clear-to-Send frames includes second information, the second information indicating the transmission bandwidth of the control frame indicated in the first information, and

wherein information included in each of the Clear-to-Send frames consists of information identical to information included in each of the other Clear-to-Send frames.

2. The method of claim 1, wherein the control frame is a Request-to-Send (RTS) frame or a multi-user (MU) RTS frame.

3. The method of claim 2, wherein the control frame is addressed to the plurality of wireless devices using a group address associated with the plurality of wireless devices and provided in a Receiver Address field of the control frame.

4. The method of claim 2, wherein the control frame is addressed to the plurality of wireless devices using one or more Association Identification fields located in a payload section of the control frame.

5. The method of claim 1, wherein one condition of the set of conditions is that the receiving device of the control frame has buffered data to transmit to the access point.

6. The method of claim 1, wherein one condition in the set of conditions is that the access point has buffered data to transmit to the receiving device of the control frame.

7. The method of claim 2, wherein one condition in the set of conditions is that a receiving device of the control frame is seeking a random access channel for an uplink transmission.

17. The method of claim 1, wherein one or more of the plurality of Clear-to-Send frames was transmitted on a bandwidth less than the transmission bandwidth of the control frame indicated in the first information.

18. The method of claim 1, wherein each wireless devices in the plurality of wireless devices is to determine whether to respond to the control frame by determining whether the set of conditions is satisfied.

8. A method for protecting a shared wireless channel for use by a wireless device, the method comprising:

analyzing, by the wireless device, a control frame from an access point, the control frame being addressed to a plurality of wireless devices, the plurality of wireless devices including the wireless device, wherein the control frame includes first information and solicits a Clear-to-Send frame from each wireless device in the plurality of wireless devices that satisfies a set of conditions, wherein the first information including an indication of a transmission bandwidth of the control frame, wherein each Clear-to-Send frame authorizes the access point to perform a downlink transmission on the shared wireless channel;

determining whether the set of conditions is satisfied; and

transmitting, by the wireless device, a Clear-to-Send frame in response to the control frame and in response to matching a field of the control frame with an address associated with the wireless device and determining that the set of conditions is satisfied, the Clear-to-Send frame including includes second information, the second information indicating the transmission bandwidth of the control frame indicated in the first information,

wherein the Clear to Send frame is transmitted at a same time and on a same frequency resource as another Clear-to-Send frame transmitted by another wireless device of the plurality of wireless devices so as to RF-combine with the other Clear-to-Send frame,

wherein information included in each of the simultaneously transmitted Clear-to-Send frames, including the Clear-to-Send frame transmitted by the wireless device, consists of information identical to information included in each of the other Clear-to-Send frames.

9. The method of claim 8, wherein the control frame is a Request-to-Send (RTS) frame or a multi-user (MU) RTS frame.

10. The method of claim 9, wherein the control frame is addressed to the plurality of wireless devices using a group address associated with the wireless device and provided in a Receiver Address field of the control frame.

11. The method of claim 9, wherein the control frame is addressed to the plurality of wireless devices using one or more Association Identification fields including an Association Identifier associated with the wireless device and located in a payload section of the control frame.

12. The method of claim 8, wherein one condition of the set of conditions is that the device that receives the control frame has buffered data to transmit to the access point.

13. The method of claim 8, wherein one condition in the set of conditions is that the access point has buffered data to transmit to the device that receives the control frame.

14. The method of claim 9, wherein one condition in the set of conditions is that a device that receives the control frame is seeking a random access channel for an uplink transmission.

15. The method of claim 8, wherein the Clear-to-Send frame is transmitted on a bandwidth less than the transmission bandwidth of the control frame indicated in the first information.

16. The method of claim 8, further comprising:

receiving the control frame on a plurality of 20 MHz channels;

performing Clear Channel Assessment of the plurality of 20 MHz channels; and

in response to a Network Allocation Vector indicating idle and the Clear Channel Assessment determining the one or more channels of the plurality of channels has been idle, transmitting the Clear to Send frame on the one or more channels determined to have been idle.

19. A method for protecting a shared wireless channel for use by an access point, the method comprising:

generating, by the access point, a control frame that is addressed to a plurality of wireless devices, includes first information, and solicits a response, the first information including an indication of a state from a set of states, the set of states respectively indicating a condition based on availabilities of secondary channels;

transmitting, by the access point, the control frame to the plurality of wireless devices; and

receiving, by the access point, a plurality of Clear-to-Send frames respectively transmitted in response to the control frame by respective wireless devices in the plurality of wireless devices that satisfy a set of conditions including the condition based on the availabilities of the secondary channels indicated in the first information, wherein each Clear-to-Send frame authorizes the access point to perform a downlink transmission on the shared wireless channel, and wherein each Clear-to-Send frame is received at a same time and on a same frequency resource,

wherein the plurality of Clear-to-Send frames are RF-combined,

wherein each of the Clear-to-Send frames includes second information, the second information including fields set according to the state indicated in the first information, and

wherein information included in each of the Clear-to-Send frames consists of information identical to information included in each of the other Clear-to-Send frames.

20. The method of claim 19,

wherein when the first information indicates a first state of the set of states, each of the Clear-to-Send frames is to be transmitted by a respective wireless device only when the Network Allocation Vector of the respective wireless device indicates idle;

and

wherein when the first information indicates a second state from the set of states, each of the Clear-to-Send frames is to be transmitted by the respective wireless device only when a Network Allocation Vector of the respective wireless device indicates idle and a Clear Channel Assessment of the respective wireless device has been idle for all secondary channels in the channel width occupied by the control frame.