Device coexistence within single user, multiple user, multiple access, and/or MIMO wireless communications

• US 8,774,124 B2
• Filed: 04/23/2012
• Issued: 07/08/2014
• Est. Priority Date: 04/24/2011
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Porat, Ron, Jindal, Nihar, Fischer, Matthew James
• Primary Examiner(s): MILLS, DONALD L
• Application Number:
  US13/454,033
• Publication Number:
  US 20120269069A1
• Time in Patent Office: 806 Days
• Field of Search: None
• US Class Current: 370/330
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2618 Reduction thereof using auxiliary subcarriers
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Device coexistence within single user, multiple user, multiple access, and/or MIMO wireless communications. Different respective communication devices operating using different respective communication channels having different respective channel bandwidths may be implemented within a given communication system. For example, different respective communication devices may belong to different basic services sets (BSSs) (e.g., a 1 MHz BSS operating using channel bandwidths of 1 MHz, and a 2 MHz BSS operating using channel bandwidths of 2 MHz). To effectuate coexistence among different respective devices operating using different respective channel bandwidths, devices but longing to the 1 MHz BSS monitor for and listen for 2 MHz wide communication activity, and those 1 MHz BSS communication devices defer to any detected communication activity on any portion of the 2 MHz channel.

Claims

1. An apparatus comprising:

a physical layer (PHY) processor configured to;

support communications with the at least one additional apparatus in accordance with a plurality of channel bandwidths, such that a first of the plurality of channel bandwidths is a sub-channel of a second of the plurality of channel bandwidths;

continuously to monitor one of the plurality of channel bandwidths for communication activity thereon; and

a baseband processor configured to;

analyze at least one signal received from the at least one additional apparatus, or at least one additional signal corresponding to the at least one signal, to identify any communication activity on any one of the plurality of channel bandwidths;

selectively direct the apparatus not to transmit any signal for a period of time when communication activity identified on any one of the plurality of channel bandwidths or allow the apparatus to support the communications with the at least one additional apparatus when no communication activity identified on any one of the plurality of channel bandwidths; and

decode the at least one signal, or the at least one additional signal corresponding to the at least one signal, to extract at least one of preamble and signal field (SIG) information therein; and

based on the at least one of preamble and SIG information, selectively decode or not decode a remainder of the at least one signal, or the at least one additional signal corresponding to the at least one signal, following the at least one of preamble and SIG information.

2. The apparatus of claim 1, wherein:

the one of the plurality of channel bandwidths is 2 MHz;

the second of the plurality of channel bandwidths is a 2 MHz bandwidth channel; and

the first of the plurality of channel bandwidths is a 1 MHz sub-channel of the 2 MHz bandwidth channel.

3. The apparatus of claim 1, wherein the baseband processing processor is further configured to:

extract signal field (SIG) length information from the at least one signal or the at least one additional signal corresponding to the at least one signal; and

selectively direct the apparatus not to transmit any signal for a counted down period of time based on the SIG length information.

4. The apparatus of claim 1 further comprising:

a laptop computer, a personal digital assistant, a personal computer, or a cellular telephone.

5. The apparatus of claim 1 further comprising:

a wireless station (STA), wherein the at least one additional apparatus is an access point (AP).

6. An apparatus comprising:

a physical layer (PHY) processor configured to support communications with at least one additional apparatus using a plurality of channel bandwidths, wherein a first of the plurality of channel bandwidths is a sub-channel of a second of the plurality of channel bandwidths; and

a baseband processor configured to;

analyze at least one signal received from the at least one additional apparatus, or at least one additional signal corresponding to the at least one signal, to identify any communication activity on any one of the plurality of channel bandwidths; and

selectively direct the apparatus not to transmit any signal for a period of time when communication activity is identified on any one of the plurality of channel bandwidths or allow the apparatus to support the communications with the at least one additional apparatus when no communication activity is identified on any one of the plurality of channel

decode the at least one signal, or the at least one additional signal corresponding to the at least one signal, to extract at least one of preamble and signal field (SIG) information therein; and

based on the at least one of preamble and SIG information, selectively decode or not decode a remainder of the at least one signal, or the at least one additional signal corresponding to the at least one signal, following the at least one of preamble and SIG information.

7. The apparatus of claim 6, wherein:

a largest channel bandwidth of any of the plurality of channel bandwidths is 2 MHz;

the second of the plurality of channel bandwidths is a 2 MHz bandwidth channel; and

the first of the plurality of channel bandwidths is a 1 MHz sub-channel of the 2 MHz bandwidth channel.

8. The apparatus of claim 6, wherein:

the PHY continuously to monitor one of the plurality of channel bandwidths for communication activity thereon.

9. The apparatus of claim 6, wherein the baseband processing processor is further configured to:

extract signal field (SIG) length information from the at least one signal or the at least one additional signal corresponding to the at least one signal; and

selectively direct the apparatus not to transmit any signal for a counted down period of time based on the SIG length information.

10. The apparatus of claim 6 further comprising:

a laptop computer, a personal digital assistant, a personal computer, or a cellular telephone.

11. The apparatus of claim 6, wherein the PHY processor is further configured to:

perform signal detection of the at least one signal received from the at least one additional apparatus based on a first portion of a signal field (SIG) field within the at least one signal having a phase rotation relative to a second portion of a SIG field within the at least one signal.

12. The apparatus of claim 6 further comprising:

a communication device within a 2 MHz basic services set (BSS) self-imposing 1 MHz communications on at least one of a first 1 MHz bandwidth channel and a 2 MHz bandwidth channel adjacent thereto within a 2 MHz channel bandwidth.

13. The apparatus of claim 6 further comprising:

a wireless station (STA), wherein the at least one additional apparatus is an access point (AP).

14. A method for execution by a communication device, the method comprising:

operating a physical layer (PHY) of the communication device to support communications with at least one additional communication device in accordance with a plurality of channel bandwidths, such that a first of the plurality of channel bandwidths is a sub-channel of a second of the plurality of channel bandwidths;

analyzing at least one signal received from the at least one additional communication device, or at least one additional signal corresponding to the at least one signal, to identify any communication activity on any one of the plurality of channel bandwidths;

selectively not transmitting any signal for a period of time when communication activity identified on any one of the plurality of channel bandwidths or allowing communications with the at least one additional communication device when no communication activity identified on any one of the plurality of channel bandwidths;

decoding the at least one signal, or the at least one additional signal corresponding to the at least one signal, to extract at least one of preamble and signal field (SIG) information therein; and

based on the at least one of preamble and SIG information, selectively decoding or not decoding a remainder of the at least one signal, or the at least one additional signal corresponding to the at least one signal, following the at least one of preamble and SIG information.

15. The method of claim 14, wherein:

a largest channel bandwidth of any of the plurality of channel bandwidths is 2 MHz;

the second of the plurality of channel bandwidths is a 2 MHz bandwidth channel; and

the first of the plurality of channel bandwidths is a 1 MHz sub-channel of the 2 MHz bandwidth channel.

16. The method of claim 14 further comprising:

operating the PHY to monitor continuously one of the plurality of channel bandwidths for communication activity thereon.

17. The method of claim 14 further comprising:

extracting signal field (SIG) length information from the at least one signal or the at least one additional signal corresponding to the at least one signal; and

selectively not transmitting any signal for a counted down period of time based on the SIG length information.

18. The method of claim 14, wherein the communication device is a laptop computer, a personal digital assistant, a personal computer, or a cellular telephone.

19. The method of claim 14 further comprising:

performing signal detection of the at least one signal received from the at least one additional communication device based on a first portion of a signal field (SIG) field within the at least one signal having a phase rotation relative to a second portion of a SIG field within the at least one signal.

20. The method of claim 14, wherein the communication device is an access point (AP), and the at least one additional communication device is a wireless station (STA).