Defense against false detection of semi-persistent scheduling (SPS) activation or release

Patent metadata

Field	Value
Publication number	US-10123224-B2
Application number	US-201414504569-A
Country	US
Kind code	B2
Filing date	Oct 2, 2014
Priority date	Oct 4, 2013
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

Certain aspects of the present disclosure provide techniques for defending against false semi-persistent scheduling (SPS) activation detection and/or missed SPS release. According to certain aspects, a user equipment (UE) may detect one or more conditions for a semi-persistent scheduling (SPS) activation or release are met based on a downlink transmission, generate one or more metrics related to downlink transmission, and determine a valid SPS activation or release has occurred if the one or more metrics satisfy one or more criteria. According to certain aspects, a UE may determine a valid semi-persistent scheduling (SPS) activation has occurred, detect a number of PDSCH CRC failures, and implicitly declare an SPS release based on the detection.

First claim

What is claimed is:

1. A method for wireless communications by a user equipment (UE), comprising:
detecting one or more conditions for a semi-persistent scheduling (SPS) activation or release are met based on a downlink transmission;
generating one or more metrics related to the downlink transmission, wherein the one or more metrics comprise a decoding quality metric; and
determining a valid SPS activation or release has occurred if the one or more metrics satisfy one or more criteria, wherein the one or more criteria comprise the decoding quality metric exceeding a threshold value.

2. The method of claim 1 , wherein:
the decoding quality metric is generated based on a physical downlink control channel (PDCCH) with a payload transmitted in a manner satisfying the one or more conditions.

3. The method of claim 1 , wherein:
the decoding quality metric is generated based on an SPS-Cell-Radio Network Temporary Identifier (C-RNTI) grant; and
the threshold value is based on an decoding quality metric of another grant in a same subframe.

4. The method of claim 1 , wherein the decoding quality metric comprises at least one of an LLR energy metric, a hamming distance, or some other metric that indicates an aggregate quality of a relation between decoded bits and input soft bits.

5. The method of claim 1 , wherein the decoding quality metric provides an indication of a probability that the detected one or more conditions correspond to an SPS activation or release.

6. A method for wireless communications by a user equipment (UE), comprising:
determining a valid semi-persistent scheduling (SPS) activation has occurred;
detecting a number of Physical Downlink Shared Control Channel (PDSCH) Cyclic Redundancy Check (CRC) failures; and
implicitly declaring an SPS release based on the detected number of PDSCH CRC failures.

7. The method of claim 6 , wherein the detecting comprises detecting a number of consecutive PDSCH CRC failures.

8. The method of claim 6 , wherein implicitly declaring the SPS release is also based on at least one of: a reference signal receive power (RSRP), reference signal receive quality (RSRQ), or a symbol error rate (SER).

9. The method of claim 6 , wherein implicitly declaring the SPS release is based on at least one of a comparison between the RSRP and a Cell-Radio Network Temporary Identifier (C-RNTI) decode success rate or a comparison between the RSRQ and the C-RNTI decode success rate.

10. An apparatus for wireless communications by a user equipment (UE), comprising:
at least one processor configured to:
detect one or more conditions for a semi-persistent scheduling (SPS) activation or release are met based on a downlink transmission;
generate one or more metrics related to the downlink transmission, wherein the one or more metrics comprise a decoding quality metric; and
determine a valid SPS activation or release has occurred if the one or more metrics satisfy one or more criteria, wherein the one or more criteria comprise the decoding quality metric exceeding a threshold value; and
a memory coupled with the at least one processor.

11. The apparatus of claim 10 , wherein:
the decoding quality metric is generated based on a physical downlink control channel (PDCCH) with a payload transmitted in a manner satisfying the one or more conditions.

12. The apparatus of claim 10 , wherein:
the decoding quality metric is generated based on an SPS-C-RNTI grant; and
the threshold value is based on an decoding quality metric of another grant in a same subframe.

13. The apparatus of claim 10 , wherein the decoding quality metric comprises at least one of an LLR energy metric, a hamming distance, or some other metric that indicates an aggregate quality of a relation between decoded bits and input soft bits.

14. The apparatus of claim 10 , wherein the decoding quality metric provides an indication of a probability that the detected one or more conditions correspond to an SPS activation or release.

15. An apparatus for wireless communications by a user equipment (UE), comprising:
at least one processor configured to:
determine a valid semi-persistent scheduling (SPS) activation has occurred;
detect a number of Physical Downlink Shared Control Channel (PDSCH) Cyclic Redundancy Check (CRC) failures; and
implicitly declare an SPS release based on the detected number of PDSCH CRC failures; and

a memory coupled with the at least one processor.

16. The apparatus of claim 15 , wherein the detecting comprises detecting a number of consecutive PDSCH CRC failures.

17. The apparatus of claim 15 , wherein the at least one processor is configured to implicitly declare the SPS release also based on at least one of: a reference signal receive power (RSRP), reference signal receive quality (RSRQ), or a symbol error rate (SER).

18. The apparatus of claim 15 , wherein implicitly declaring the SPS release is based on at least one of a comparison between the RSRP and a Cell-Radio Network Temporary Identifier (C-RNTI) decode success rate or a comparison between the RSRQ and the C-RNTI decode success rate.

Assignees

• Qualcomm Inc

Inventors

• Ramkumar Vasanth Kumar
• Bressanelli Dominique Francois
• Burdge Brandon Allen
• Krishnamoorthi Deepak
• Wang Kevin Shaokwan
• Rajagopalan Srinivasan

Classifications

• H04W72/54 Primary

  based on quality criteria · CPC title

• H04L1/20

  using signal quality detector · CPC title

• H04J11/0079

  Acquisition of downlink reference signals, e.g. detection of cell-ID · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W72/08

  Electricity · mapped topic