Method and apparatus for resolving time domain conflict in device-to-device communication

• US 10,231,239 B2
• Filed: 07/20/2016
• Issued: 03/12/2019
• Est. Priority Date: 07/20/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Iyer, Ashish, Santhanam, Arvind, Balasubramanian, Srinivasan, Amerga, Daniel, Hoover, Scott, Park, Cheol Hee, Rajagopalan, Srinivasan, Maheshwari, Shailesh, Shahidi, Reza
• Primary Examiner(s): Renner, Brandon M
• Application Number:
  US15/215,340
• Publication Number:
  US 20180027559A1
• Time in Patent Office: 965 Days
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

Device-to-device operations are scheduled based on receive and transmit pools that may have a conflict in time domain. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus for resolving time domain conflict in device-to-device communication are provided. The apparatus may compute a first block rate metric for a first device-to-device communication on a first frequency and a second block rate metric for a second device-to-device communication on a second frequency. The apparatus may detect a time-domain conflict between the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency. The apparatus may prioritize the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency based on the first block rate metric and the second block rate metric.

Claims

1. A method of wireless communication, comprising:

computing a first block rate metric for a first device-to-device communication on a first frequency and a second block rate metric for a second device-to-device communication on a second frequency, wherein the first block rate metric or the second block rate metric is a cumulative measure over a period of time of a number of resource blocks that have been assigned but are lost for use by the respective first device-to-device communication or the second device-to-device communication due to time-domain conflicts between the first device-to-device communication and the second device-to-device communication, wherein the number of resource blocks that have been assigned but are lost for use changes over the period of time;

detecting a time-domain conflict between the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency; and

prioritizing the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency based on the first block rate metric and the second block rate metric.

2. The method of claim 1, wherein the first device-to-device communication is a device-to-device transmit operation and the second device-to-device communication is a device-to-device receive operation.

3. The method of claim 2, wherein the device-to-device transmit operation on the first frequency is prioritized over the device-to-device receive operation on the second frequency when the first block rate metric is greater than or equal to a threshold.

4. The method of claim 2, wherein the device-to-device receive operation on the second frequency is prioritized over the device-to-device transmit operation on the first frequency when the first block rate metric is less than the threshold.

5. The method of claim 1, wherein the first device-to-device communication is a first device-to-device receive operation and the second device-to-device communication is a second device-to-device receive operation.

6. The method of claim 5, wherein the first device-to-device receive operation on the first frequency is prioritized over the second device-to-device receive operation on the second frequency when the first block rate metric is greater than the second block rate metric.

7. The method of claim 5, wherein one of the first device-to-device receive operation on the first frequency and the second device-to-device receive operation on the second frequency is randomly selected to prioritize over another one of the first device-to-device receive operation on the first frequency and the second device-to-device receive operation on the second frequency when the first block rate metric is equal to the second block rate metric.

8. The method of claim 1, further comprising:

performing one of the first device-to-device communication on the first frequency or the second device-to-device communication on the second frequency that has a higher priority during subframes in which the time-domain conflict occurs; and

abstaining from performing one of the first device-to-device communication on the first frequency or the second device-to-device communication on the second frequency that has a lower priority during subframes in which the time-domain conflict occurs.

9. The method of claim 1, wherein at least one of the first block rate metric or the second block rate metric is computed based on a number of resource blocks lost in eligible monitoring subframes for a device-to-device receive operation during a fixed period of time and a number of monitoring attempts for the device-to-device receive operation during the fixed period of time.

10. The method of claim 1, wherein one of the first block rate metric or the second block rate metric is computed based on a number of resource blocks lost in selected transmit subframes for a device-to-device transmit operation during a fixed period of time and a total number of the selected transmit subframes for the device-to-device transmit operation during the fixed period of time.

11. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

compute a first block rate metric for a first device-to-device communication on a first frequency and a second block rate metric for a second device-to-device communication on a second frequency, wherein the first block rate metric or the second block rate metric is a cumulative measure over a period of time of a number of resource blocks that have been assigned but are lost for use by the respective first device-to-device communication or the second device-to-device communication due to time-domain conflicts between the first device-to-device communication and the second device-to-device communication, wherein the number of resource blocks that have been assigned but are lost for use changes over the period of time;

detect a time-domain conflict between the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency; and

prioritize the first device-to-device communication on the first frequency and the second device-to-device communication on the second frequency based on the first block rate metric and the second block rate metric.

12. The apparatus of claim 11, wherein the first device-to-device communication is a device-to-device transmit operation and the second device-to-device communication is a device-to-device receive operation.

13. The apparatus of claim 12, wherein the device-to-device transmit operation on the first frequency is prioritized over the device-to-device receive operation on the second frequency when the first block rate metric is greater than or equal to a threshold.

14. The apparatus of claim 12, wherein the device-to-device receive operation on the second frequency is prioritized over the device-to-device transmit operation on the first frequency when the first block rate metric is less than the threshold.

15. The apparatus of claim 11, wherein the first device-to-device communication is a first device-to-device receive operation and the second device-to-device communication is a second device-to-device receive operation.

16. The apparatus of claim 15, wherein the first device-to-device receive operation on the first frequency is prioritized over the second device-to-device receive operation on the second frequency when the first block rate metric is greater than the second block rate metric.

17. The apparatus of claim 15, wherein one of the first device-to-device receive operation on the first frequency and the second device-to-device receive operation on the second frequency is randomly selected to prioritize over another one of the first device-to-device receive operation on the first frequency and the second device-to-device receive operation on the second frequency when the first block rate metric is equal to the second block rate metric.

18. The apparatus of claim 11, wherein the at least one processor is further configured to:

perform one of the first device-to-device communication on the first frequency or the second device-to-device communication on the second frequency that has a higher priority during subframes in which the time-domain conflict occurs; and

abstain from performing one of the first device-to-device communication on the first frequency or the second device-to-device communication on the second frequency that has a lower priority during subframes in which the time-domain conflict occurs.

19. The apparatus of claim 11, wherein at least one of the first block rate metric or the second block rate metric is computed based on a number of resource blocks lost in eligible monitoring subframes for a device-to-device receive operation during a fixed period of time and a number of monitoring attempts for the device-to-device receive operation during the fixed period of time.

20. The apparatus of claim 11, wherein one of the first block rate metric or the second block rate metric is computed based on a number of resource blocks lost in selected transmit subframes for a device-to-device transmit operation during a fixed period of time and a total number of the selected transmit subframes for the device-to-device transmit operation during the fixed period of time.