Radio Node D2D Discovery Resource Selection

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Solution Overview

Problem

Existing D2D discovery techniques in cellular networks face challenges such as beacon signal collisions and inefficient resource utilization, particularly when the number of devices exceeds the available discovery resources, leading to difficulties in device detection and decoding.

Innovation Solution

A method where a radio node calculates SINR values for each resource based on received beacon signals and selects the resource that maximizes the number of capable discovering nodes or achieves the highest average SINR, allowing for autonomous and decentralized peer discovery resource selection without network assistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If devices randomly select Peer Discovery Resources (PDR) for beacon signaling, then resource selection is simple and fast, but beacon signal collisions occur making discovery difficult or impossible

Engineering Contradiction:

Improvediscovery speedVSAvoidbeacon signal detectability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the selection criterion from random to SINR-based. Each device calculates SINR values for available PDRs and selects the resource with the highest SINR, transforming the selection parameter from random chance to quality-based metric, thereby reducing collisions while maintaining simple operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Devices autonomously measure SINR on available PDRs and select their own resources without network assistance. This self-service mechanism allows each device to independently choose the best resource based on local measurements, reducing collisions while keeping the system simple and fast

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If greedy selection of PDRs is used to maximize distance separation, then resource utilization improves, but the technique requires complex measurements per peer discovery resource and per neighbor node

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidmeasurement capability requirement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the complex distance-based selection parameter with SINR measurements. Instead of calculating Euclidean distances between nodes, devices measure SINR values which inherently account for spatial separation and interference, simplifying the measurement requirement while maintaining resource utilization efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the mechanical/geometric distance measurement system with an electromagnetic field-based SINR measurement system. SINR measurements naturally capture the effectiveness of spatial separation without requiring explicit distance calculations, reducing device complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Quantity of substance

If the number of nodes exceeds the number of available discovery resources, then all PDRs are being used leading to collisions, but reducing the number of resources decreases discovery capacity

Engineering Contradiction:

Improvenumber of discovered devicesVSAvoidbeacon signal interference

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by allowing different devices to use different PDRs based on their local SINR measurements. Instead of uniform resource allocation, each device selects the PDR with the best local SINR condition, creating a distributed resource allocation pattern that reduces collisions while maintaining high discovery capacity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic resource selection where devices can change their selected PDR based on changing SINR conditions. This dynamic adaptation allows the system to respond to varying network conditions and device distributions, optimizing both discovery capacity and interference reduction

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9949281B2Method and radio node for managing resources for D2D discovery in an ad-hoc radio communication network

Publication Date: 2018.04.17 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method and a radio node (110) for managing resources for D2D discovery in an ad-hoc radio communication munication network (100). The radio node (110) receives beacon signals from a number of further radio nodes (120, 130, 140). A respective beacon signal includes values indicating power received at the respective further radio node (120, 130, 140) for each resource of the amount of resources. The radio node (110) calculates, for each respective further radio node (120, 130, 140), values of SINR based on the values indicating power received at the respective further radio node (120, 130, 140). The radio node (110) selects at least one resource out of the amount of resources to increase number of discovering further radio nodes (120, 30, 140) and/or to increase average SINRover the further radio nodes (120, 130, 40). The radio node (110) broadcasts a further beacon signal on the selected at least one resource.