Sidelink Radio Resource Intersection for Hidden Node Mitigation

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Solution Overview

Problem

Existing device-to-device (D2D) communication systems face challenges with the hidden node problem and inefficient resource allocation, particularly in directional radio communications, leading to increased latency and resource loss.

Innovation Solution

A method where a first radio device determines and communicates radio resources based on received signals to a second radio device, using spatial streams and status messages to avoid collisions and optimize resource use, thereby mitigating the hidden node problem and improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If distributed scheduling is used for V2X communication, then device autonomy and flexibility are improved, but the hidden node problem occurs leading to resource conflicts and increased latency

Engineering Contradiction:

Improvedevice autonomyVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by having transmitting devices perform channel sensing and resource selection in advance before actual data transmission. The device autonomously selects radio resources from a pre-configured pool based on sensing results, preparing the transmission path beforehand to avoid conflicts and reduce latency during actual communication.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where transmitting devices monitor the channel for signals from receiving devices indicating successful reception or resource availability. This feedback loop allows the transmitting device to adjust its resource selection and retransmission strategy, improving communication reliability while maintaining autonomous operation.

Inventive Principle:

Principle #23Feedback

2Reliability

If contention window mechanism is used to mitigate hidden node problem, then collision avoidance is improved, but radio resource loss and latency increase

Engineering Contradiction:

Improvecollision avoidanceVSAvoidcommunication latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of using contention windows that delay transmission, the patent applies preliminary action by having devices perform channel sensing and autonomously select resources before transmission. This allows the device to proceed with transmission immediately after resource selection without waiting for contention window expiration, reducing latency while avoiding collisions through intelligent resource selection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables self-service by allowing transmitting devices to autonomously select their own radio resources from a pre-configured pool based on channel sensing results, without relying on centralized scheduling or contention window mechanisms. This self-service approach eliminates the time loss associated with contention windows while maintaining collision avoidance through distributed intelligence.

Inventive Principle:

Principle #25Self-service

3Productivity

If directional radio transmission is used for V2X communication, then communication efficiency is improved, but the hidden node problem persists even with neighboring nodes

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidhidden node mitigation

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by having each transmitting device independently sense the channel and select radio resources based on its local observations and the specific directional communication requirements. Each device adapts its resource selection to its local environment and transmission direction, allowing efficient directional communication while mitigating hidden node problems through localized decision-making.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses preliminary action by having devices perform channel sensing and resource selection before directional transmission. This advance preparation allows the device to identify suitable resources that avoid conflicts with other directional transmissions, maintaining both communication efficiency and reliability in directional V2X scenarios.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12574959B2Technique for device-to-device communication based on radio signals received from one or more radio sources

Publication Date: 2026.03.10 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A second user equipment can be configured to communicate with a first user equipment via sidelink. The second user equipment can receive, from the first user equipment, a first set of preferred radio resources. The second user equipment can determine a second set of radio resources based on radio signals received at the second user equipment. The second user equipment can select at least one radio resource for transmitting data to the first user equipment from within an intersection of the first set of preferred radio resources and the second set of radio resources.