Power optimization using scheduling request delay

• US 9,161,371 B2
• Filed: 07/18/2012
• Issued: 10/13/2015
• Est. Priority Date: 07/21/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ehsan, Navid, Klingenbrunn, Thomas
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Jangbahadur, Lakeram
• Application Number:
  US13/552,455
• Publication Number:
  US 20130021995A1
• Time in Patent Office: 1,182 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Certain aspects of the disclosure relate generally to techniques for managing scheduling requests (SRs) for resources for uplink transmission. For example, certain aspects of the present disclosure relate to a method for wireless communication including determining a transmit opportunity for transmitting SR for uplink resources based, at least in part, on a discontinuous reception (DRX) time cycle. According to certain aspects, a user equipment (UE) may delay transmitting the SR based on the DRX time cycle to prevent repeated interruption of the DRX cycle that may reduce benefits of the power-saving DRX scheme.

Claims

1. A method for wireless communications by a user equipment (UE), comprising:

selecting a scheduling request (SR) delay based, at least in part, on a length of a discontinuous reception (DRX) time cycle and a channel condition;

determining a transmission delay comprising a time interval to a first SR transmit opportunity for transmitting an SR for uplink resources that occurs after the SR delay;

selecting an SR transmit opportunity based on a comparison of the transmission delay and a delay threshold; and

transmitting the SR in the selected SR transmit opportunity.

2. The method of claim 1, wherein a length of the SR delay comprises at least a length until an end of an off duration period of the DRX time cycle.

3. The method of claim 1, wherein the first delay value is 20 msec and the second delay value is 5 msec.

4. The method of claim 1, wherein the delay threshold comprises a time value determined based, at least in part, on a general delay requirement for voice communications over the wireless communications.

5. The method of claim 1, further comprising:

modifying a DRX process based on the selected SR transmit opportunity.

6. The method of claim 1, further comprising:

determining that the UE has a data packet to send, wherein the selecting of the SR delay is in response to the determination.

7. The method of claim 1, wherein the first SR transmit opportunity is selected if the determined transmission delay does not exceed the delay threshold.

8. An apparatus for wireless communication by a user equipment (UE), comprising:

means for selecting a scheduling request (SR) delay based, at least in part, on a length of a discontinuous reception (DRX) time cycle and a channel condition, wherein the SR delay comprises a first delay value corresponding to a good channel condition or a second delay value corresponding to a bad channel condition;

means for determining a transmission delay comprising a time interval to a first SR transmit opportunity for transmitting an SR for uplink resources that occurs after the SR delay;

means for selecting an SR transmit opportunity based on a comparison of the transmission delay and a delay threshold, wherein a transmit opportunity that occurs prior to the first SR transmit opportunity is selected if the transmission delay exceeds the delay threshold; and

means for transmitting the SR in the selected SR transmit opportunity.

9. The apparatus of claim 8, wherein a length of the SR delay comprises at least a length until an end of an off duration period of the DRX time cycle.

10. The apparatus of claim 8, wherein the first delay value is 20 msec and the second delay value is 5 msec.

11. The apparatus of claim 8, wherein the delay threshold comprises a time value determined based, at least in part, on a general delay requirement for voice communications over the wireless communications.

12. The apparatus of claim 8, further comprising:

means for modifying a DRX process based on the selected SR transmit opportunity.

13. The apparatus of claim 8, further comprising:

means for determining that the UE has a data packet to send, wherein the selecting of the SR delay is in response to the determination.

14. The apparatus of claim 8, wherein the first SR transmit opportunity is selected if the determined transmission delay does not exceed the delay threshold.

15. A non-transitory computer-readable medium having computer executable code stored thereon that, when executed by at least one processor, causes the at least one processor to:

select a scheduling request (SR) delay based, at least in part, on a length of a discontinuous reception (DRX) time cycle and a channel condition, wherein the SR delay comprises a first delay value corresponding to a good channel condition or a second delay value corresponding to a bad channel condition;

determine a transmission delay comprising a time interval to a first SR transmit opportunity for transmitting an SR for uplink resources that occurs after the SR delay;

select an SR transmit opportunity based on a comparison of the transmission delay and a delay threshold, wherein a transmit opportunity that occurs prior to the first SR transmit opportunity is selected if the transmission delay exceeds the delay threshold; and

transmit the SR in the selected SR transmit opportunity.

16. An apparatus for wireless communication by a user equipment (UE), comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to;

select a scheduling request (SR) delay based, at least in part, on a length of a discontinuous reception (DRX) time cycle and a channel condition, wherein the SR delay comprises a first delay value corresponding to a good channel condition or a second delay value corresponding to a bad channel condition;

determine a transmission delay comprising a time interval to a first SR transmit opportunity for transmitting an SR for uplink resources that occurs after the SR delay;

select an SR transmit opportunity based on a comparison of the transmission delay and a delay threshold, wherein a transmit opportunity that occurs prior to the first SR transmit opportunity is selected if the transmission delay exceeds the delay threshold; and

transmit the SR in the selected SR transmit opportunity.