Deferral Information in Postambles and Midambles

• US 20160197755A1
• Filed: 01/06/2016
• Published: 07/07/2016
• Est. Priority Date: 01/07/2015
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Barriac, Gwendolyn Denise, Cherian, George, Merlin, Simone, Asterjadhi, Alfred, Zhou, Yan, Tian, Qingjiang, Ding, Gang, Tian, Bin
• Application Number:
  US14/989,576
• Publication Number:
  US 20160197755A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Certain aspects of the present disclosure relate to including deferral information in postambles and midambles. An apparatus for wireless communications may generally include a processing system configured to generate a first frame having at least one of a midamble or a postamble that provides an indication of a request for a device to defer transmitting for a duration and an interface configured to output the first frame for transmission. Another apparatus for wireless communications may generally include a processing system configured to generate a frame having at least one of a midamble or a postamble designed to allow a device, after exiting a low-power state, to perform synchronization to the frame and an interface for outputting the frame for transmission. Including midambles and postambles in a frame allow for more reliable responses and may reduce throughput losses and interference.

Claims

1. An apparatus for wireless communications, comprising:

a processing system configured to generate a first frame having at least one of a midamble or a postamble that provides an indication of a request for a device to defer transmitting for a duration; and

an interface configured to output the first frame for transmission.

2. The apparatus of claim 1, wherein the duration is associated with a portion of the first frame and a response to the first frame to be transmitted.

3. The apparatus of claim 2, wherein the response to the first frame comprises an acknowledgment (ACK) or a clear-to-send (CTS) message.

4. The apparatus of claim 1, wherein:

the at least one of the midamble or the postamble comprises a bit indicating the request for the device to defer, and

the duration is defined by the apparatus and the device, is defined in a standard, or is a default value.

5. The apparatus of claim 1, wherein:

the at least one of the midamble or the postamble comprises a plurality of bits indicating the request for the device to defer, and at least one of a basic service set (BSS) color, a duration of the remainder of the first frame, a duration for a response to the first frame to be transmitted, a type of the response, a modulation and coding scheme (MCS) of the response, or a request for overlapping BSSs (OBSSs) to defer.

6. The apparatus of claim 1, wherein:

the first frame has a midamble and a postamble, and

the processing system is configured to include different information in the midamble than in the postamble.

7. The apparatus of claim 1, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs).

8. The apparatus of claim 1, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs) and one or more long training fields (LTFs).

9. The apparatus of claim 1, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs), one or more long training fields (LTFs), and one or more signal (SIG) fields.

10. The apparatus of claim 1, wherein:

the processing system is further configured to generate a second frame comprising the postamble, and

the interface is further configured to output the second frame for transmission to the device.

11. The apparatus of claim 10, wherein the interface is configured to output the second frame for transmission a short interframe space (SIFS) time after the first frame.

12. An apparatus for wireless communications, comprising:

an interface configured to obtain a frame having at least one of a midamble or a postamble that provides an indication of a request for a device to defer transmitting on a medium for a duration; and

a processing system configured to defer transmitting on the medium based on the duration.

13. The apparatus of claim 12, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs), and

the processing system is configured to sense the one or more STFs based on as it would sense a legacy STF.

14. The apparatus of claim 13, wherein the processing system is configured to determine presence of the at least one of a midamble or a postamble based on absence of both long training fields (LTFs) and signal (SIG) fields.

15. The apparatus of claim 13, wherein the processing system is configured to determine information about the duration based on at least one of:

a number of STFs in the frame or in phase information in the one or more STFs.

16. The apparatus of claim 12, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs) and one or more long training fields (LTFs), and

the processing system is configured to determine presence of the at least one of a midamble or a postamble based on absence of a signal (SIG) field.

17. The apparatus of claim 12, wherein:

the at least one of a midamble or a postamble comprises one or more short training fields (STFs), one or more long training fields (LTFs), and one or more signal (SIG) fields, and

the processing system is configured to sense the one or more STFs, the one or more LTFs, and the one or more SIG fields as it would sense a legacy STF, a legacy LTF, and a legacy SIG.

18. The apparatus of claim 17, wherein the one or more SIG fields comprise at least a legacy SIG field that indicates the duration requested for deferral.

19. An apparatus for wireless communications, comprising:

an interface configured to obtain a frame having at least one of a midamble or a postamble; and

a processing system configured to exit a low-power state and perform synchronization, after exiting the low-power state, based on the at least one of a midamble or a postamble.

20. The apparatus of claim 19, wherein:

the obtained frame comprises a multiple user (MU) aggregated medium access control (MAC) protocol data unit (AMPDU) intended for the apparatus; and

the processing system is configured to process the AMPDU after performing the synchronization.

21. The apparatus of claim 19, wherein:

the processing system is configured to determine when to transmit a response to the frame based on the synchronization; and

the interface is further configured to output the response for transmission in accordance with the determination.

22. An apparatus for wireless communications, comprising:

a processing system configured to generate a frame having at least one of a midamble or a postamble designed to allow a device, after exiting a low-power state, to perform synchronization to the frame; and

an interface for outputting the frame for transmission.

23. The apparatus of claim 22, wherein the generated frame comprises a multiple user (MU) aggregated medium access control (MAC) protocol data unit (AMPDU) having an MPDU intended for the device.

24-77. -77. (canceled)