Methods and apparatuses for transmitting energy-saving indicator in frames

• US 8,767,598 B2
• Filed: 04/01/2008
• Issued: 07/01/2014
• Est. Priority Date: 04/01/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Rajamani, Krishnan
• Primary Examiner(s): Renner, Brandon
• Assistant Examiner(s): MUSA, ABDELNABI O
• Application Number:
  US12/060,823
• Publication Number:
  US 20090245280A1
• Time in Patent Office: 2,282 Days
• Field of Search: 370/311, 370/318, 455/343.1, 455/343.2, 455/343.5
• US Class Current: 370/311
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In embodiments, a transmitting device sends a time reference field to a receiving device when indicating that no more frames will be sent to the receiving device. The time reference informs the receiving device of the length of time that the transmitting device has committed not to transmit to the receiving device. When operating in conformance with the ECMA-368 standard, the time reference allows the transmitting device to control the length of the commitment period after the MORE FRAMES bit is set to zero. In this way, the commitment not to transmit may be made for a shorter time than the time until the beginning of the following Distributed Reservation Protocol (DRP) reservation block or the time to the beginning of the following superframe. The time reference may be added in the Medium Access Control header or included in a vendor-specific message, for example.

Claims

1. A method for sending wireless transmissions, the method comprising:

transmitting payload data from a first device to a second device in response to the payload data being available;

determining that the payload data for transmitting from the first device to the second device is unavailable;

transmitting a first value of an indicator from the first device to the second device in response to determining that the payload data for transmitting from the first device to the second device is unavailable, wherein the first value of the indicator indicates that the first device will not transmit to the second device for a first period of time;

transmitting a first time reference value from the first device to the second device, the first time reference value replacing the first period of time, and the first time reference value being transmitted in response to determining that the payload data for transmitting from the first device to the second device is unavailable, wherein the first time reference value defines a second period of time that is less than the first period of time, and wherein the first device will not transmit to the second device during the second period of time;

transmitting a second value of the indicator from the first device to the second device in response to the payload data being available, the step of transmitting the second value of the indicator being performed before the steps of transmitting the first value of the indicator and transmitting the first time reference value, wherein the second value of the indicator indicates that the first device will transmit the payload data to the second device;

wherein;

the first device is configured to transmit to the second device in accordance with ECMA-368 standard, the transmitting the first value of the indicator comprises transmitting a MORE FRAMES bit set to zero, and the transmitting the second value of the indicator comprises transmitting the MORE FRAMES bit set to one; and

the transmitting the payload data is performed in a superframe, and the transmitting the first time reference value is performed in the superframe.

2. The method of claim 1, wherein the transmitting the payload data is performed using Distributed Reservation Protocol (DRP) reservations.

3. The method of claim 1, wherein the transmitting the payload data is performed using unreserved Prioritized Contention Access (PCA).

4. The method of claim 1, wherein the transmitting the payload data is performed using Prioritized Contention Access Distributed Reservation Protocol (PCA DRP).

5. The method of claim 1, wherein the transmitting the payload data is performed using Prioritized Contention Access (PCA) transmission during soft Distributed Reservation Protocol (DRP).

6. The method of claim 1, wherein the transmitting the payload data is performed using Distributed Reservation Protocol (DRP) reservations in a first reservation block of the superframe, wherein the first period of time ends after beginning of a second reservation block of the superframe, the second reservation block beginning after the first reservation block.

7. The method of claim 1, wherein the transmitting the payload data is performed using Distributed Reservation Protocol (DRP) reservations in a reservation block of the superframe, wherein the first period of time ends before end of the reservation block.

8. The method of claim 1, wherein the transmitting the first time reference value comprises transmitting the first time reference value in an enhanced MAC header of a Zero-length Data frame.

9. The method of claim 1, wherein the transmitting the first time reference value comprises transmitting the first time reference value in an enhanced MAC header of a Command frame.

10. The method of claim 1, wherein the transmitting the first time reference value comprises transmitting the first time reference value in a vendor-specific Command Frame payload.

11. The method of claim 1, further comprising:

selecting the first time reference value from a plurality of time reference values based at least in part on patterns of traffic in a network that comprises the first and the second devices.

12. The method of claim 1:

selecting the first time reference value from a plurality of time reference values based at least in part on sensitivity of application generating the payload data to latency and to throughput of the payload data.

13. The method of claim 1, further comprising:

storing at the first device a plurality of time reference values;

selecting the first time reference value from the plurality of time reference values;

in response to the payload being unavailable upon expiration of the second period of time, (1) transmitting the first value of the indicator from the first device to the second device, (2) selecting a second time reference value from the plurality of time reference values, the second time reference value being different from the first time reference value, and (3) transmitting the second time reference value from the first device to the second device;

wherein the transmitting the first value in response to the payload being unavailable upon expiration of the second period of time indicates that the first device will not transmit the payload data to the second device for a third period of time, the third period of time having a length defined by the second time reference value.

14. A wireless apparatus comprising:

a memory;

a receiver;

a transmitter;

a controller coupled to the receiver, the transmitter, and the memory, and wherein the controller is configured to;

transmit payload data from a first device to a second device in response to the payload data being available;

determine that the payload data for transmitting from the wireless apparatus to a wireless device is unavailable,

transmit a first value of an indicator from the wireless apparatus to the wireless device when the payload data is determined to be unavailable, wherein the first value of the indicator indicates that the wireless apparatus will not transmit to the wireless device for a first period of time,

transmit a first time reference value from the wireless apparatus to said wireless device, the first time reference value replacing the first period of time, and the first time reference value being transmitted when the payload data is determined to be unavailable, wherein the first time reference value defines a second period of time that is less than the first period of time, and wherein the wireless apparatus will not transmit to the wireless device during the second period of time;

wherein the controller is further configured to transmit a second value of the indicator from the wireless apparatus to the wireless device if the payload data is available, before transmitting the first value of the indicator and the first time reference value, and wherein the second value of the indicator indicates that the wireless apparatus will transmit the payload data to the wireless device; and

,

wherein;

the wireless apparatus is configured to transmit to the wireless device in accordance with ECMA-368 standard, the indicator is a MORE FRAMES bit, the first value of the indicator is zero, and the second value of the indicator is one; and

the controller is configured to transmit the payload data and the first time reference value in a superframe.

15. The wireless apparatus of claim 14, wherein the controller is configured to transmit the payload data using Distributed Reservation Protocol (DRP) reservations.

16. The wireless apparatus of claim 14, wherein the controller is configured to transmit the payload data using unreserved Prioritized Contention Access (PCA).

17. The wireless apparatus of claim 14, wherein the controller is configured to transmit the payload data using Prioritized Contention Access Distributed Reservation Protocol (PCA DRP).

18. The wireless apparatus of claim 14, wherein the controller is configured to transmit the payload data using Prioritized Contention Access (PCA) transmission during soft Distributed Reservation Protocol (DRP).

19. The wireless apparatus of claim 14, wherein the controller is configured to transmit the first time reference value in an enhanced MAC header of a Zero-length Data frame.

20. The wireless apparatus of claim 14, wherein the controller is configured to transmit the first time reference value in an enhanced MAC header of a Command frame.

21. The wireless apparatus of claim 14, wherein the controller is configured to transmit the first time reference value in a vendor-specific Command Frame payload.

22. The wireless apparatus of claim 14, wherein the controller is further configured to select the first time reference value from a plurality of time reference values based at least in part on patterns of traffic in a network that comprises the wireless apparatus and the wireless device.

23. The wireless apparatus of claim 14, wherein the controller is further configured to select the first time reference value from a plurality of time reference values based at least in part on sensitivity to power savings of the wireless device and to current battery charge level of the wireless device.

24. The wireless apparatus of claim 14, wherein the controller is further configured to:

select the first time reference value from a plurality of time reference values; and

in response to unavailability of the payload data upon expiration of the second period of time, (1) transmit the first value of the indicator from the wireless apparatus to the wireless device, (2) select a second time reference value from the plurality of time reference values, the second time reference value being different from the first time reference value, and (3) transmit the second time reference value from the wireless apparatus to the wireless device, wherein transmission of the first value in response to unavailability of the payload data upon the expiration of the second period of time indicates that the wireless apparatus will not transmit the payload data to the wireless device for a third period of time, the third period of time having a length defined by the second time reference.

25. A computer-readable storage device comprising instructions, wherein when the instructions are executed by at least one controller of a wireless apparatus, the instructions cause the wireless apparatus to perform:

transmiting payload data from a first device to a second device in response to the payload data being available;

determining that the payload data for transmitting from the wireless apparatus to a wireless device is unavailable,

transmiting a first value of an indicator from the wireless apparatus to the wireless device when the payload data is determined to be unavailable, wherein the first value of the indicator indicates that the wireless apparatus will not transmit to the wireless device for a first period of time, and

transmiting a first time reference value from the wireless apparatus to said wireless device, the first time reference value replacing the first period of time, and the first time reference value being transmitted when the payload data is determined to be unavailable, wherein the first time reference value defines a second period of time that is less than the first period of time, and wherein the wireless apparatus will not transmit to the wireless device during the second period of time;

transmitting a second value of the indicator from the wireless apparatus to the wireless device in response to the payload data being available, the transmitting the second value of the indicator being performed before the transmitting the first value of the indicator and transmitting the first time reference value, and wherein the second value of the indicator indicates that the wireless apparatus will transmit the payload data to the wireless device;

transmiting to the wireless device in accordance with ECMA-368 standard, the transmitting the first value of the indicator comprises transmitting a MORE FRAMES bit set to zero, and the transmitting the second value of the indicator comprises transmitting the MORE FRAMES bit set to one; and

the transmitting the payload data is performed in a superframe, and the transmitting the first time reference value is performed in the superframe.

26. The computer-readable storage device of claim 25, wherein the transmitting the payload data is performed using Distributed Reservation Protocol (DRP) reservations.

27. The computer-readable storage device of claim 25, wherein the transmitting the payload data is performed using unreserved Prioritized Contention Access (PCA).

28. The computer-readable storage device of claim 25, wherein the transmitting the payload data is performed using Prioritized Contention Access Distributed Reservation Protocol (PCA DRP).

29. The computer-readable storage device of claim 25, wherein the transmitting the payload data is performed using Prioritized Contention Access (PCA) transmission during soft Distributed Reservation Protocol (DRP).

30. The computer-readable storage device of claim 25, wherein the transmitting the first time reference value comprises transmitting the first time reference value in an enhanced MAC header of a Zero-length Data frame.

31. The computer-readable storage device of claim 25, wherein the transmitting the first time reference value comprises transmitting the first time reference value in an enhanced MAC header of a Command frame.

32. The computer-readable storage device of claim 25, wherein the transmitting the first time reference value comprises transmitting the first time reference value in a vendor-specific Command Frame payload.

33. The computer-readable storage device of claim 25, wherein the instructions further cause the wireless apparatus to perform:

selecting the first time reference value from a plurality of time reference values based at least in part on patterns of traffic in a network that comprises the wireless apparatus and the wireless device.

34. The computer-readable storage device of claim 25, wherein the instructions further cause the wireless apparatus to perform:

selecting the first time reference value from a plurality of time reference values based at least in part on sensitivity to power savings of the wireless device and to current battery charge level of the wireless device.

35. The computer-readable storage device of claim 25, wherein the instructions further cause the wireless apparatus to perform:

selecting the first time reference value from a plurality of time reference values stored at the wireless apparatus;

in response to unavailability of the payload data upon expiration of the second period of time, (1) transmitting the first value of the indicator from the wireless apparatus to the wireless device, (2) selecting a second time reference value from the plurality of time reference values, the second time reference value being different from the first time reference value, and (3) transmitting the second time reference value from the wireless apparatus to the wireless device;

wherein the step of transmitting the first value in response to the unavailability of the payload data upon the expiration of the second period indicates that the wireless apparatus will not transmit the payload data to the wireless device for a third period of time, the third period of time having a length defined by the second time reference value.

36. A method of operating a wireless device, the method comprising:

receiving payload data from a wireless apparatus;

receiving an indicator from the wireless apparatus;

determining that the indicator has a first value that indicates that the wireless apparatus will not transmit to the wireless device for a first length of time;

receiving a time reference value from the wireless apparatus, the time reference value replacing the first length of time, and the time reference value being transmitted in response to the indicator having the first value, wherein the time reference value defines a second length of time that is less than the first length of time, and wherein the wireless apparatus will not transmit to the wireless device during the second length of time;

selecting the second length of time corresponding to the time reference value;

turning at least part of a receiver of the wireless device to an off state for the second length of time; and

turning said at least part of the receiver to an on state upon expiration of the second length of time;

transmitting a second value of the indicator from the first device to the second device in response to the payload data being available, the step of transmitting the second value of the indicator being performed before the steps of transmitting the first value of the indicator and transmitting the first time reference value, wherein the second value of the indicator indicates that the first device will transmit the payload data to the second device;

wherein;

the first device is configured to transmit to the second device in accordance with ECMA-368 standard, the transmitting the first value of the indicator comprises transmitting a MORE FRAMES bit set to zero, and the transmitting the second value of the indicator comprises transmitting the MORE FRAMES bit set to one; and

the transmitting the payload data is performed in a superframe, and the transmitting the first time reference value is performed in the superframe.

37. A wireless device comprising:

a memory;

a receiver;

a transmitter; and

a controller coupled to the receiver, the transmitter, and the memory, the controller is configured to;

receive payload data from a wireless apparatus;

receive an indicator from the wireless apparatus;

determine that the indicator has a first value that indicates that the wireless apparatus will not transmit to the wireless device for a first length of time;

receive a time reference value from the wireless apparatus, the time reference value replacing the first length of time, and the time reference value being transmitted in response to the indicator having the first value, wherein the time reference value defines a second length of time that is less than the first length of time, and wherein the wireless apparatus will not transmit to the wireless device during the second length of time;

select the second length of time corresponding to the time reference value;

turn at least part of a receiver of the wireless device to an off state for the second length of time; and

turn said at least part of the receiver to an on state upon expiration of the second length of time;

wherein the controller is further configured to transmit a second value of the indicator from the wireless apparatus to the wireless device if the payload data is available, before transmitting the first value of the indicator and the first time reference value, and wherein the second value of the indicator indicates that the wireless apparatus will transmit the payload data to the wireless device; and

,

wherein;

the wireless apparatus is configured to transmit to the wireless device in accordance with ECMA-368 standard, the indicator is a MORE FRAMES bit, the first value of the indicator is zero, and the second value of the indicator is one; and

the controller is configured to transmit the payload data and the first time reference value in a superframe.

38. A non-transitory computer-readable storage device comprising instructions, wherein when the instructions are executed by at least one controller of a wireless device, the instructions cause the wireless device to perform:

receiving payload data from a wireless apparatus;

receiving an indicator from the wireless apparatus;

determining that the indicator has a first value that indicates that the wireless apparatus will not transmit to the wireless device for a first length of time;

receiving a time reference value from the wireless apparatus, the time reference value replacing the first length of time, and the time reference value being transmitted in response to the indicator having the first value, wherein the time reference value defines a second length of time that is less than the first length of time, and wherein the wireless apparatus will not transmit to the wireless device during the second length of time;

selecting the second length of time corresponding to the time reference value;

turning at least part of a receiver of the wireless device to an off state for the second length of time; and

turning said at least part of the receiver to an on state upon expiration of the second length of time;

transmitting a second value of the indicator from the wireless apparatus to the wireless device in response to the payload data being available, the transmitting the second value of the indicator being performed before the transmitting the first value of the indicator and transmitting the first time reference value, and wherein the second value of the indicator indicates that the wireless apparatus will transmit the payload data to the wireless device;

transmiting to the wireless device in accordance with ECMA-368 standard, the transmitting the first value of the indicator comprises transmitting a MORE FRAMES bit set to zero, and the transmitting the second value of the indicator comprises transmitting the MORE FRAMES bit set to one; and

the transmitting the payload data is performed in a superframe, and the transmitting the first time reference value is performed in the superframe.