D2D Signal Reception via PRB Quality Thresholding

Solution Overview

Problem

In device-to-device (D2D) communication, the existing methods for receiving discovery signals or scheduling assignment signals result in increased complexity and power consumption due to unnecessary computations from blind decoding across all possible frequency regions, leading to inefficiencies in resource usage and energy consumption.

Innovation Solution

A method where a terminal measures signal quality for each physical resource block (PRB) region and performs demodulation only on candidate PRB regions with signal quality greater than or equal to a threshold, using single carrier frequency division multiple access (SC-FDMA) and fast Fourier transform (FFT), thereby reducing unnecessary computations and focusing demodulation efforts on optimal signal regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If blind decoding is performed in all frequency regions where discovery signal or SA signal can exist, then signal reception reliability is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidreceiver complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing signal quality measurement in advance before blind decoding. The receiving terminal measures signal quality for each PRB region first, identifies candidate regions with sufficient quality, and then performs blind decoding only in those candidate regions. This preliminary quality assessment prevents unnecessary blind decoding operations in low-quality regions, reducing complexity while maintaining reliable signal reception where quality is adequate.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the frequency region into multiple PRB (Physical Resource Block) regions and evaluates each segment independently for signal quality. By dividing the overall frequency spectrum into discrete PRB segments and measuring signal quality per segment, the system can selectively process only those segments that meet quality thresholds, avoiding uniform processing of all frequency regions and thereby reducing overall receiver complexity.

Inventive Principle:

Principle #1Segmentation

2Reliability

If blind decoding is performed in all frequency regions where discovery signal or SA signal can exist, then signal reception reliability is improved, but power consumption increases

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by performing signal quality measurement in advance before blind decoding. The receiving terminal measures signal quality for each PRB region first, identifies candidate regions with sufficient quality, and then performs blind decoding only in those candidate regions. This preliminary quality assessment prevents unnecessary blind decoding operations in low-quality regions, reducing complexity while maintaining reliable signal reception where quality is adequate.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies partial action by performing blind decoding not in all frequency regions, but only in candidate PRB regions that meet signal quality thresholds. This partial processing approach processes only the necessary subset of regions where successful reception is likely, avoiding wasteful power consumption in regions where signal quality is insufficient for reliable decoding.

Inventive Principle:

Principle #16Partial or excessive action

3Use of energy by moving object

If signal quality measurement and candidate region selection is performed, then power consumption is reduced, but processing time increases

Engineering Contradiction:

Improvepower consumptionVSAvoidsignal processing time

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent performs signal quality measurement as a preliminary step before blind decoding. Although this adds an initial measurement phase, it prevents numerous unsuccessful blind decoding attempts in low-quality regions, which would consume both time and power. The measurement-then-select approach filters out futile decoding operations early, reducing overall processing time for successful signal acquisition.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10028223B2Method of receiving signal based on signal quality in device to device (D2D) communication

Publication Date: 2018.07.17 LG ELECTRONICS INC

AI summary

One disclosure of the present specification provides a method of receiving a signal based on signal quality in a device to device (D2D) communication. The method may include: receiving a signal from the other terminal; measuring signal quality for each of a plurality of physical resource block (PRB) regions included in a frequency region in which the signal can be received; choosing a candidate PRB region for which demodulation is performed among the plurality of PRB regions on the basis of the measured signal quality; and performing demodulation on the candidate PRB region.