Method and apparatus for measuring D2D signal or selecting relay in wireless communication system

• US 10,462,692 B2
• Filed: 04/18/2016
• Issued: 10/29/2019
• Est. Priority Date: 04/17/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chae, Hyukjin, Seo, Hanbyul, Lee, Seungmin
• Primary Examiner(s): Patel, Parth
• Application Number:
  US15/564,422
• Publication Number:
  US 20180139640A1
• Time in Patent Office: 1,289 Days
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

An embodiment of the present invention relates to a method for performing measurement by a terminal in a wireless communication system, the method comprising the steps of: receiving D2D signals transmitted by a plurality of relay terminals; and performing measurement using at least one signal among the D2D signals, wherein the D2D signal subjected to the measurement is a D2D signal having a valid CRC.

Claims

1. A method of performing measurement by a user equipment (UE) in a wireless communication system, the method comprising:

receiving Device-to-Device (D2D) signals transmitted by a plurality of relay UEs;

performing first measurement using a Cyclic Redundancy Check (CRC)-passed D2D signal of a first ID;

performing second measurement using a CRC-passed D2D signal of a second ID;

wherein a result of the first measurement is used after updating by using a result of the second measurement, when the first ID is same with the second ID, and

wherein the result of the first measurement is used without the updating by using the result of the second measurement, when the first ID is different from the second ID.

2. The method according to claim 1, wherein the D2D signals are Physical Sidelink Discovery Channels (PSDCHs) and the first and second measurements are calculated of an average of received powers of Demodulation Reference Signal (DMRS) Resource Elements (REs) of the PSDCHs.

3. The method according to claim 1, wherein a period in which the PDSCHs are transmitted is one of {40 ms, 80 ms, 70 ms, 140 ms, 280 ms, 60 ms, 120 ms, and 240 ms}.

4. The method according to claim 1, wherein the UE measures a D2D Received Signal Strength Indicator (RSSI) on symbols in a subframe except for a first symbol and a last symbol of the subframe.

5. A User Equipment (UE) for performing measurement in a wireless communication system, the UE comprising:

a transmitter and a receiver; and

a processor,

wherein the processor configured to receive Device-to-Device (D2D) signals transmitted by a plurality of relay UEs, to perform first measurement using a Cyclic Redundancy Check (CRC)-passed D2D signal of a first ID, to perform second measurement using a CRC-passed D2D signal of a second ID; and

wherein a result of the first measurement is used after updating by using a result of the second measurement, when the first ID is same with the second ID, and

wherein the result of the first measurement is used without the updating by using the result of the second measurement, when the first ID is different from the second ID.

6. The UE according to claim 5, wherein the D2D signals are Physical Sidelink Discovery Channels (PSDCHs) and the first and second measurements are calculated of an average of received powers of Demodulation Reference Signal (DMRS) Resource Elements (REs) of the PSDCHs.

7. The UE according to claim 5, wherein a period in which the PDSCHs are transmitted is one of {40 ms, 80 ms, 70 ms, 140 ms, 280 ms, 60 ms, 120 ms, and 240 ms}.

8. The UE according to claim 5, wherein the UE measures a D2D Received Signal Strength Indicator (RSSI) on symbols in a subframe except for a first symbol and a last symbol of the subframe.