Signal Quality Measurement for Device-To-Device Communication

Patent metadata

Field	Value
Publication number	US-2016204885-A1
Application number	US-201514893135-A
Country	US
Kind code	A1
Filing date	Oct 9, 2015
Priority date	Oct 10, 2014
Publication date	Jul 14, 2016
Grant date	—

Abstract

According to some embodiments, a method in a wireless device comprises measuring power of a Device-to-Device (D2D) signal used by the wireless device for D2D operation; determining a power difference between the measured power of the D2D signal and a physical Device-to-Device Synchronization Signal (D2DSS); estimating power of a D2DSS using the measured power of the D2D signal and the determined power difference; and performing a D2D operation using the estimated power of the D2DSS.

First claim

1 . A method in a wireless device, the method comprising:
measuring power of a Device-to-Device (D2D) signal used by the wireless device for D2D operation; determining a power difference between the measured power of the D2D signal and a physical Device-to-Device Synchronization Signal (D2DSS); estimating power of a D2DSS using the measured power of the D2D signal and the determined power difference; and performing a D2D operation using the estimated power of the D2DSS.

2 . The method of claim 1 , wherein the D2D signal comprises a signal of a Physical Device-to-Device Shared Channel (PD2DSCH).

3 . The method of claim 2 , wherein the signal of the PD2DSCH is a Demodulation Reference Signal (DMRS).

4 . The method of claim 2 , wherein the signal of the PD2DSCH is a physical resource.

5 . The method of claim 1 , wherein the D2D signal is a DMRS for a Scheduling Assignment (SA) or a DMRS for a D2D data transmission.

6 . The method of claim 1 , wherein the D2D signal is a physical resource for a SA or a physical resource for a D2D data transmission.

7 . The method of claim 5 , further comprising disabling open-loop power control for the SA and the D2D data transmission.

8 . The method of claim 1 , wherein determining a power difference between the measured power of the D2D signal and the D2DSS comprises determining a power difference between a DMRS for a PD2DSCH and the physical D2DSS.

9 . A method in a wireless device, the method comprising:
identifying a set of wireless devices performing Device-to-Device (D2D) data communication or D2D discovery; identifying a set of Device-to-Device Synchronization Signals (D2DSS) transmitted by the identified wireless devices performing D2D data communication or D2D discovery; measuring power of a D2DSS from the identified set of D2DSS; and performing a D2D operation using the measured power of the D2DSS.

10 . The method of claim 9 , wherein:
identifying a set of wireless devices performing D2D data communication or D2D discovery comprises: measuring a power level of a plurality of Device-to-Device Shared Channel (D2DSCH) resources; and determining, using the measured power level of the plurality of D2DSCH resources, whether a wireless device associated with each of the plurality of D2DSCH resources is performing D2D data communication or D2D discovery; and identifying a set of D2DSS transmitted by the identified wireless devices performing D2D data communication or D2D discovery comprises identifying a D2DSS paired with each of the PD2DSCH determined to be associated with a wireless device performing D2D data communication or D2D discovery.

11 . The method of claim 9 , wherein identifying a set of wireless devices performing D2D data communication or D2D discovery comprises:
measuring a power level of a plurality of D2DSS resources; and determining, using a statistical distribution of the measured power level of the plurality of D2DSS resources, whether a wireless device associated with each of the plurality of D2DSS resources is performing D2D data communication or D2D discovery.

12 . A wireless device comprising a processor operable to:
measure power of a Device-to-Device (D2D) signal used by the wireless device for D2D operation; determine a power difference between the measured power of the D2D signal and a physical Device-to-Device Synchronization Signal (D2DSS); estimate power of a D2DSS using the measured power of the D2D signal and the determined power difference; and perform a D2D operation using the estimated power of the D2DSS.

13 . The wireless device of claim 12 , wherein the D2D signal comprises a signal of a Physical Device-to-Device Shared Channel (PD2DSCH).

14 . The wireless device of claim 13 , wherein the signal of the PD2DSCH is a Demodulation Reference Signal (DMRS).

15 . The wireless device of claim 13 , wherein the signal of the PD2DSCH is a physical resource.

16 . The wireless device of claim 12 , wherein the D2D signal is a DMRS for a Scheduling Assignment (SA) or a DMRS for a D2D data transmission.

17 . The wireless device of claim 12 , wherein the D2D signal is a physical resource for a SA or a physical resource for a D2D data transmission.

18 . The wireless device of claim 16 , wherein the processor is further operable to disable open-loop power control for the SA and the D2D data transmission.

19 . The wireless device of claim 12 , wherein the processor operable to determine a power difference between the measured power of the D2D signal and the D2DSS is operable to determine a power difference between a DMRS for a PD2DSCH and the physical D2DSS.

20 . A wireless device comprising a processor operable to:
identify a set of wireless devices performing Device-to-Device (D2D) data communication or D2D discovery; identify a set of Device-to-Device Synchronization Signals (D2DSS) transmitted by the identified wireless devices performing D2D data communication or D2D discovery; measure power of a D2DSS from the identified set of D2DSS; and perform a D2D operation using the measured power of the D2DSS.

21 . The wireless device of claim 20 , wherein the processor operable to identify a set of wireless devices performing D2D data communication or D2D discovery is operable to:
measure a power level of a plurality of Device-to-Device Shared Channel (D2DSCH) resources; and determine, using the measured power level of the plurality of D2DSCH resources, whether a wireless device associated with each of the plurality of D2DSCH resources is performing D2D data communication or D2D discovery; and the processor operable to identify a set of D2DSS transmitted by the identified wireless devices performing D2D data communication or D2D discovery is operable to identify a D2DSS paired with each of the PD2DSCH determined to be associated with a wireless device performing D2D data communication or D2D discovery.

22 . The method of claim 20 , wherein the processor operable to identify a set of wireless devices performing D2D data communication or D2D discovery is operable to:
measure a power level of a plurality of D2DSS resources; and determine, using a statistical distribution of the measured power level of the plurality of D2DSS resources, whether a wireless device associated with each of the plurality of D2DSS resources is performing D2D data communication or D2D discovery.

23 . A wireless device comprising a measuring module, a determining module, an estimating module, and a D2D communications module;
the measuring module is operable to measure power of a Device-to-Device (D2D) signal used by the wireless device for D2D operation; the determining module is operable to determine a power difference between the measured power of the D2D signal and a physical Device-to-Device Synchronization Signal (D2DSS); the estimating module is operable to estimate power of a D2DSS using the measured power of the D2D signal and the determined power difference; and the D2D communications module is operable to perform a D2D operation using the estimated power of the D2DSS.

24 . A wireless device comprising an identifying module, a measuring module, and a D2D communications module;
the identifying module is operable to: identify a set of wireless devices performing Device-to-Device (D2D) data communication or D2D discovery; and identify a set of Device-to-Device Synchronization Signals (D2DSS) transmitted by the identified wireless devic

Assignees

• Ericsson Telefon Ab L M

Inventors

• Sorrentino Stefano
• Song Xinghua

Classifications

• H04W52/16

  Deriving transmission power values from another channel · CPC title

• H04W52/383 Primary

  power control in peer-to-peer links · CPC title

• H04W72/04

  Wireless resource allocation · CPC title

• H04W76/14

  Direct-mode setup · CPC title

• H04B17/328

  Reference signal received power [RSRP]; Reference signal received quality [RSRQ] · CPC title