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

• US 8,582,485 B2
• Filed: 06/16/2010
• Issued: 11/12/2013
• 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): Thier, Michael
• Assistant Examiner(s): Alia, Curtis A
• Application Number:
  US12/817,118
• Publication Number:
  US 20100309871A1
• Time in Patent Office: 1,245 Days
• Field of Search: 370/221, 370/312, 370/338, 370/448, 370/445, 370/447, 370/334, 370/336, 455/434, 455/450, 455/453
• US Class Current: 370/312
• 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. An apparatus, comprising:

a baseband processing module for generating a multi-user request to send (mRTS) frame, wherein the mRTS frame includes a plurality of clear to send (CTS) response instructions corresponding respectively to each of a plurality of wireless communication devices and further includes cluster information for a plurality of clusters for use, respectively, by the plurality of wireless communication devices, wherein each cluster of the plurality of clusters is based upon a tone mapping of at least one channel, the at least one channel being situated with a band of a plurality of bands; and

a plurality of antennae;

transmitting the mRTS frame to the plurality of wireless communication devices; and

in response to the mRTS frame, receiving a plurality of CTS responses, based on a respective scheduling of each of the plurality of CTS response instructions, from the plurality of wireless communication devices or from a subset of the plurality of wireless communication devices to provide an airtime reservation with the each of the plurality of wireless communication devices or the subset thereof.

2. The apparatus 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 apparatus 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 apparatus of claim 1, wherein:

the plurality of CTS responses being received 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 apparatus 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 apparatus of claim 1, wherein:

after the apparatus receiving the plurality of CTS responses and based thereon, the baseband processing module generating at least one of a multi-user multiple input multiple output (MU-MIMO) frame and an orthogonal frequency division multiple access (OFDMA) frame; and

the plurality of antennae transmitting the at least one of the MU-MIMO frame and the 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.

7. The apparatus of claim 6, wherein:

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

8. The apparatus of claim 1, wherein:

the mRTS frame including beamforming vector signaling information corresponding to at least one of the plurality of wireless communication devices.

9. The apparatus of claim 1, 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 a second of the plurality of clusters.

10. The apparatus of claim 1, wherein:

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

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

11. The apparatus of claim 1, wherein:

the apparatus simultaneously receiving at least two of the plurality of CTS responses.

12. The apparatus of claim 1, wherein:

the apparatus firstly receiving one of the plurality of CTS responses; and

the apparatus secondly receiving all remaining other of the plurality of CTS responses.

13. The apparatus of claim 1, wherein:

the baseband processing module generating a plurality of request to send (RTS) frames;

the plurality of antennae;

simultaneously transmitting the plurality of RTS frames respectively to the plurality of wireless communication devices such that each of the plurality of RTS frames corresponding respectively to one of the plurality of wireless communication devices; and

receiving at least one additional plurality of CTS responses from the plurality of wireless communication devices, from the subset of the plurality of wireless communication devices, or from at least one additional subset of the plurality of wireless communication devices; and

each of the plurality of RTS frames including a respective one of the plurality of CTS response instructions corresponding respectively to one of the plurality of wireless communication devices.

14. The apparatus of claim 1, wherein:

the apparatus being an access point (AP); and

the plurality of wireless communication devices being a plurality of wireless stations (STAs).

15. An apparatus, comprising:

a baseband processing module for generating a multi-user request to send (mRTS) frame, wherein the mRTS frame includes a plurality of clear to send (CTS) response instructions corresponding respectively to each of the plurality of wireless communication devices and further includes cluster information for a plurality of clusters for use, respectively, by the plurality of wireless communication devices, wherein each cluster of the plurality of clusters is based upon a tone mapping of at least one channel being situated with a band of a plurality of bands; and

a plurality of antennae;

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

in response to the mRTS, receiving a plurality of CTS responses, based on a respective scheduling of each of the plurality of CTS response instructions, from the plurality of wireless communication devices or from a first subset of the plurality of wireless communication devices to provide an airtime reservation with the each of the plurality of wireless communication devices or the first subset thereof; and

wherein;

after the apparatus receiving the plurality of CTS responses and based thereon, the baseband processing module generating at least one of a multi-user multiple input multiple output (MU-MIMO) frame and an orthogonal frequency division multiple access (OFDMA) frame;

the plurality of antennae transmitting the at least one of the MU-MIMO frame and the OFDMA frame to the plurality of wireless communication devices, to the first subset of the plurality of wireless communication devices, or to a second subset of the plurality of wireless communication devices via the airtime reservation; and

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

16. The apparatus of claim 15, wherein:

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

17. The apparatus of claim 15, 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.

18. The apparatus of claim 15, wherein:

the plurality of CTS responses being received 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.

19. The apparatus of claim 15, wherein:

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

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

20. The apparatus of claim 15, wherein:

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

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

21. The apparatus of claim 15, wherein:

the apparatus being an access point (AP); and

the plurality of wireless communication devices being a plurality of wireless stations (STAs).

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

generating a multi-user request to send (mRTS) frame, wherein the mRTS frame including a plurality of clear to send (CTS) response instructions corresponding respectively to each of a plurality of wireless communication devices and further including cluster information for a plurality of clusters for use, respectively, by the plurality of wireless communication devices, wherein each cluster of the plurality of clusters is based upon a tone mapping of at least one channel being situated with a band of a plurality of bands;

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

in response to the mRTS frame, receiving a plurality of CTS responses, based on a respective scheduling of each of the plurality of CTS response instructions, from the plurality of wireless communication devices or from a subset of the plurality of wireless communication devices to provide an airtime reservation with each of the plurality of wireless communication devices or the subset thereof.

23. The method of claim 22, wherein:

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

24. The method of claim 22, 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.

25. The method of claim 22, 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.

26. The method of claim 22, further comprising:

after receiving the plurality of CTS responses and based thereon, generating at least one of a multi-user multiple input multiple output (MU-MIMO) frame and an orthogonal frequency division multiple access (OFDMA) frame; and

operating the plurality of antennae transmitting the at least one of the MU-MIMO frame and the 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.

27. The method of claim 22, 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 a second of the plurality of clusters.

28. The method of claim 22, wherein:

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

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

29. The method of claim 22, wherein:

the wireless communication device being an access point (AP); and

the plurality of wireless communication devices being a plurality of wireless stations (STAs).