Scheduled clear to send (CTS) for multiple user, multiple access, and/or MIMO wireless communications

• US 9,337,986 B2
• Filed: 09/27/2013
• Issued: 05/10/2016
• Est. Priority Date: 06/05/2009
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Fischer, Matthew James, Amini, Peiman, Erceg, Vinko, Lauer, Joseph Paul, Kim, Joonsuk
• Primary Examiner(s): Alia, Curtis A
• Application Number:
  US14/039,712
• Publication Number:
  US 20140029543A1
• Time in Patent Office: 956 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

Scheduled clear to send (CTS) for multiple user, multiple access, and/or MIMO wireless communications. Before sending transmissions, a request to send (RTS)/clear to send (CTS) exchange takes place between a transmitting wireless communication device and multiple receiving wireless communication devices may take place therein. The transmitting wireless communication device (e.g., an AP) may generate and transmit a multi-user request to send (mRTS) frame to a number of receiving wireless communication devices (e.g., STAs). The mRTS frame can include information and instructions therein to direct the manner by which all or a subset of the receiving wireless communication devices are to provide CTS responses back to the transmitting wireless communication device. The mRTS frame may be an OFDMA frame, a MU-MIMO frame, or a combination thereof. The CTS responses may be received in accordance with any one or combination of OFDM signaling, OFDMA signaling, and MU-MIMO signaling.

Claims

1. A wireless communication device, comprising:

a baseband processing module; and

memory coupled to the baseband processing module to store operational instructions that, when executed, cause the baseband processing module to;

receive a multi-user request to send (mRTS) frame that is operable to effectuate multiple clear to send (CTS) response transmissions to a subset of a plurality of wireless communication devices including the wireless communication device, the mRTS frame including a plurality of CTS response instructions with operational parameters to govern a manner by which the multiple CTS response transmissions are to be transmitted, each of the plurality of CTS response instructions directed to a corresponding one the subset of the plurality of the wireless communication devices, the operational parameters including scheduling information for a CTS response order based at least in part on a receive capability of each of the subset of the plurality of wireless communication devices; and

transmit, in response to a respective CTS response instruction of the mRTS frame, a clear to send (CTS) response.

2. The wireless communication device of claim 1, wherein:

the mRTS frame being a multi-user multiple input multiple output (MU-MIMO) frame or an orthogonal frequency division multiple access (OFDMA) frame.

3. The wireless communication device of claim 1, wherein:

the mRTS frame being an orthogonal frequency division multiple access/multi-user multiple input multiple output (OFDMA/MU-MIMO) frame including a plurality of request to send (RTS) frames.

4. The wireless communication device of claim 1, wherein:

the plurality of CTS responses transmitted from the plurality of wireless communication devices in accordance with at least one of orthogonal frequency division multiplexing (OFDM) signaling, orthogonal frequency division multiple access (OFDMA) signaling, and multi-user multiple input multiple output (MU-MIMO) signaling.

5. The wireless communication device of claim 1, wherein:

the plurality of wireless communication devices including at least one multiple input multiple output (MU-MIMO) wireless communication device and at least one orthogonal frequency division multiple access (OFDMA) wireless communication device.

6. The wireless communication device of claim 1, wherein the operational instructions further cause the baseband processing module to:

receive at least one of a MU-MIMO frame and an OFDMA frame directed to the subset of the plurality of wireless communication devices, or to at least one additional subset of the plurality of wireless communication devices.

7. The wireless communication device of claim 6, wherein the operational instructions further cause the baseband processing module to:

apply a plurality of beamforming vectors to the at least one of the MU-MIMO frame and the OFDMA frame.

8. A wireless communication device, comprising:

a baseband processing module; and

memory coupled to the baseband processing module and configured to store operational instructions that, when executed, cause the baseband processing module to;

receive a multi-user request to send (mRTS) frame, the mRTS frame operable to effectuate multiple clear to send (CTS) transmissions by a plurality of wireless communication devices, which plurality includes the wireless communication device, the mRTS frame including a plurality of CTS response instructions with operational parameters to govern a manner by which the multiple CTS transmissions are to be transmitted, each of the plurality of CTS response instructions directed to a corresponding one subset of the plurality of the wireless communication devices, the operational parameters including scheduling information for a CTS response order based at least in part on a receive capability of each of the subset of the plurality of wireless communication devices; and

in response to the mRTS frame transmit a CTS response, wherein;

receive at least one of a multi-user multiple input multiple output (MU-MIMO) frame and an orthogonal frequency division multiple access (OFDMA) frame, the wireless communication device belonging to a first subset of the plurality of wireless communication devices, or to a second subset of the plurality of wireless communication devices;

the plurality of the CTS response instructions including cluster information indicating a plurality of clusters for use in providing the plurality of CTS responses by the first subset or the second subset of the plurality of wireless communication devices.

9. The wireless communication device of claim 8, wherein:

the mRTS frame being a multi-user multiple input multiple output (MU-MIMO) frame or an orthogonal frequency division multiple access (OFDMA) frame.

10. The wireless communication device of claim 8, wherein:

the mRTS frame being an orthogonal frequency division multiple access/multi-user multiple input multiple output (OFDMA/MU-MIMO) frame including a plurality of request to send (RTS) frames.

11. The wireless communication device of claim 8, wherein:

the plurality of CTS responses being transmitted in accordance with at least one of orthogonal frequency division multiplexing (OFDM) signaling, orthogonal frequency division multiple access (OFDMA) signaling, and multi-user multiple input multiple output (MU-MIMO) signaling.

12. The wireless communication device of claim 8, wherein the plurality of clusters further comprising:

a first of the plurality of clusters being composed of at least one channel within a first band; and

a second of the plurality of clusters being composed of at least one channel within a second band.

13. The wireless communication device of claim 8, wherein the plurality of clusters further comprising:

a first of the plurality of clusters being composed of a first plurality of channels among a first band and a second band; and

a second of the plurality of clusters being composed of a second plurality of channels among a third band and a fourth band.

14. A method for operating a wireless communication device, the method comprising:

generating a multi-user request to send (mRTS) frame that includes a plurality of clear to send (CTS) response instructions with operational parameters to govern a manner by which a corresponding plurality of CTS response transmissions are to be transmitted by a plurality of wireless communication devices, the plurality of CTS response instructions corresponding respectively to each of the plurality of wireless communication devices that include the wireless communication device or a subset of the plurality of the wireless communication devices, the operational parameters including scheduling information for a CTS response order based at least in part of a receive capability of the each of the plurality of the wireless communication devices;

operating a plurality of antennae for transmitting the mRTS frame to the plurality of wireless communication devices; and

receiving, based on the plurality of the CTS response instructions and the operational parameters of the mRTS frame, a plurality of clear to send (CTS) responses from the plurality of wireless communication devices or from the subset of the plurality of wireless communication devices.

15. The method of claim 14, wherein:

the mRTS frame being a multi-user multiple input multiple output (MU-MIMO) frame or an orthogonal frequency division multiple access (OFDMA) frame.

16. The method of claim 14, wherein:

the mRTS frame being an orthogonal frequency division multiple access/multi-user multiple input multiple output (OFDMA/MU-MIMO) frame including a plurality of request to send (RTS) frames.

17. The method of claim 14, further comprising:

receiving the plurality of CTS responses from the plurality of wireless communication devices in accordance with at least one of orthogonal frequency division multiplexing (OFDM) signaling, orthogonal frequency division multiple access (OFDMA) signaling, and multi-user multiple input multiple output (MU-MIMO) signaling.

18. The method of claim 14, further comprising:

receiving, in response to the CTS responses, at least one of a multi-user multiple input multiple output (MU-MIMO) frame and an orthogonal frequency division multiple access (OFDMA) frame to the plurality of wireless communication devices, to the subset of the plurality of wireless communication devices, or to at least one additional subset of the plurality of wireless communication devices.

19. The method of claim 14, wherein:

the plurality of CTS response instructions including scheduling information directing the plurality of wireless communication devices for providing the plurality of CTS responses; and

the plurality of CTS response instructions including cluster information indicating a plurality of clusters for use, respectively, by the plurality of wireless communication devices for providing the plurality of CTS responses.

20. The method of claim 19, wherein:

the cluster information directing a first of the plurality of wireless communication devices for providing a first of the plurality of CTS responses via a first of the plurality of clusters; and

the cluster information directing a second of the plurality of wireless communication devices for providing a second of the plurality of CTS responses via second of the plurality of clusters.