A User Equipment and a Method for Link Quality Determination

Patent metadata

Field	Value
Publication number	US-2017126338-A1
Application number	US-201615037928-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Apr 2, 2015
Publication date	May 4, 2017
Grant date	—

Abstract

The disclosed embodiments relates to a method performed by an D2D capable UE ( 800 ) and also relates to the D2D capable UE ( 800 ) for determining link quality of a D2D signal or D2D channel. The method includes receiving ( 710 ) a D2D signal or channel transmitted from another D2D capable UE; if detection ( 720 ) of the D2D signal or channel is determined to be successful; identifying ( 730 ) the identity of the other D2D capable UE; measuring ( 740 ) received signal power on resources of the D2D signal or channel; measuring ( 750 ) signal strength indicator on resources of the D2D signal or channel or on other resources different from the resources of the D2D signal or channel; and determining ( 760 ) link quality based on the measured received signal power and based on the measured signal strength indicator.

First claim

1 - 13 . (canceled)

14 . A method in a Device-to-Device (D2D)-capable User Equipment (UE) for determining a link quality of a D2D signal or channel, the method comprising:
receiving the D2D signal or channel transmitted from another D2D-capable UE; responsive to successful detection of the D2D signal or channel, identifying the other D2D-capable UE; measuring a received signal power on resources of the D2D signal or channel; measuring a signal strength indicator on the resources of the D2D signal or channel or on other resources different from the resources of the D2D signal or channel; and determining the link quality based on the measured received signal power and based on the measured signal strength indicator.

15 . The method according to claim 14 , wherein receiving the D2D signal or channel comprises receiving a discovery signal from the other D2D-capable UE.

16 . The method according to claim 14 , wherein measuring the signal strength indicator comprises measuring the signal strength indicator on resources associated with the successfully detected D2D signal or channel.

17 . The method according to claim 14 , wherein measuring the signal strength indicator comprises measuring the signal strength indicator on resources for a data signal or on resources for a scheduling assignment (SA), wherein the resources for the data signal or the resources for the SA are different from the resources over which the received signal power of the received D2D signal or channel is measured.

18 . The method according to claim 14 , wherein determining the link quality comprises determining the link quality according to:
the link quality=N PRB ×(the measured received signal power/the measured signal strength indicator), where N PRB is a number of physical resource blocks (PRB) over a measurement bandwidth used for D2D communication.

19 . The method according to claim 14 , wherein measuring the received signal power on the resources of the D2D signal or channel comprises measuring a Reference Signal Receive Power (RSRP) of the D2D signal or channel, and wherein measuring the signal strength indicator on the resources of the D2D signal or channel or on the other resources different from the resources of the D2D signal or channel comprises measuring a Received Signal Strength Indicator (RSSI), and wherein determining the link quality based on the measured RSRP and based on the measured RSSI comprises measuring a Reference Signal Received Quality (RSRQ) of the D2D signal or channel.

20 . A Device-to-Device (D2D)-capable User Equipment (UE) configured to determine a link quality of a D2D signal or channel, the D2D-capable UE comprising:
a transceiver circuit configured to receive the D2D signal or channel transmitted from another D2D-capable UE; and a processing circuit configured to:
responsive to successful detection of the D2D signal or channel, identify the other D2D-capable UE;
measure a received signal power on resources of the D2D signal or channel;
measure a signal strength indicator on the resources of the D2D signal or channel or on other resources different from the resources of the D2D signal or channel; and
determine the link quality based on the measured received signal power and based on the measured signal strength indicator.

21 . The D2D-capable UE according to claim 20 , wherein the D2D signal or channel is a discovery signal received from the other D2D-capable UE.

22 . The D2D-capable UE according to claim 20 , wherein the processing circuit is configured to measure the signal strength indicator on resources associated with the successfully detected D2D signal or channel.

23 . The D2D-capable UE according to claim 20 , wherein the processing circuit is configured to measure the signal strength indicator on resources for a data signal or on resources for a scheduling assignment (SA), wherein the resources for the data signal or the resources for the SA are different from the resources over which the received signal power of the received D2D signal or channel is measured.

24 . The D2D-capable UE according to claim 20 , wherein the processing circuit is configured to determine the link quality according to:
the link quality=N PRB ×(the measured received signal power/the measured signal strength indicator), where N PRB is a number of physical resource blocks (PRB) over a measurement bandwidth used for D2D communication.

25 . The D2D-capable UE according to claim 20 , wherein the measured received signal power is a Reference Signal Receive Power (RSRP) of the D2D signal or channel, and wherein the measured signal strength indicator is a Received Signal Strength Indicator (RSSI), and wherein the link quality is a Reference Signal Received Quality (RSRQ) of the D2D signal or channel.

26 . A non-transitory computer-readable storage medium storing a computer program comprising program instructions that, when executed by a processing circuit of a Device-to-Device (D2D)-capable UE, cause the D2D-capable UE to:
receive a D2D signal or channel transmitted from another D2D-capable UE; responsive to successful detection of the D2D signal or channel, identify the other D2D-capable UE; measure a received signal power on resources of the D2D signal or channel; measure a signal strength indicator on the resources of the D2D signal or channel or on other resources different from the resources of the D2D signal or channel; and determine a link quality of the D2D signal or channel based on the measured received signal power and based on the measured signal strength indicator.

Assignees

• ERICSSON TELEFON AB L M (publ)
• ERICSSON TELEFON AB L M (publ)

Inventors

• Zaidi Ali
• Sorrentino Stefano

Classifications

• H04W8/005 Primary

  Discovery of network devices, e.g. terminals · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W24/08

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

• H04W76/14

  Direct-mode setup · CPC title

• H04L1/0035

  evaluation of received explicit signalling · CPC title