Sidelink Interface States for V2X Radio Link Failure Detection

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Solution Overview

Problem

Current V2X communication systems lack defined states for sidelink interfaces, leading to delayed detection of radio link failures and increased latency in unicast connections under poor radio conditions, as they rely solely on upper layer signaling which may take time to recognize issues.

Innovation Solution

Defining Sidelink-CONNECTED and non-Sidelink-CONNECTED states for wireless communication devices to manage sidelink channel connections, allowing for timely transition between these states based on radio link quality and triggering events like Radio Link Failure, enabling proactive reestablishment of connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If upper layer signaling is used to detect radio link failures in V2X communications, then the system can maintain simplicity in the sidelink interface, but the detection latency increases and reliability decreases under poor radio conditions

Engineering Contradiction:

Improveradio link failure detection reliabilityVSAvoiddetection latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the detection function by introducing a dedicated physical layer monitoring mechanism (PSCCH/PSSCH reception monitoring) that operates independently from upper layer signaling. This segmentation allows the physical layer to detect radio link failures autonomously, reducing detection latency and improving reliability without requiring complex cross-layer interactions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by establishing state transition criteria and procedures before radio link failures occur. The device proactively monitors physical layer conditions and transitions states based on pre-defined thresholds, enabling faster response to deteriorating radio conditions without waiting for upper layer detection.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If no defined states are established for sidelink interfaces, then the system complexity remains low, but the ability to manage connections under poor radio conditions deteriorates

Engineering Contradiction:

Improveconnection management adaptabilityVSAvoidstate management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by introducing state transitions that allow the sidelink interface to adapt its behavior based on radio conditions. The device dynamically switches between Sidelink-CONNECTED and non-Sidelink-CONNECTED states, enabling flexible connection management that responds to changing radio conditions while maintaining manageable complexity through well-defined transition criteria.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameter of the sidelink interface by defining distinct states (Sidelink-CONNECTED and non-Sidelink-CONNECTED) with specific characteristics. This parameterization allows the system to adapt to different radio conditions by transitioning between states, improving connection management versatility without significantly increasing device complexity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If timely transition between states is enabled based on radio link quality, then the reliability of unicast connections improves, but the complexity of state monitoring and transition increases

Engineering Contradiction:

Improveunicast connection reliabilityVSAvoidstate monitoring complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where the device continuously monitors physical layer reception conditions (PSCCH/PSSCH) and uses this feedback to determine state transitions. This feedback loop enables reliable connection management by automatically transitioning states based on measured radio conditions, balancing reliability improvement with manageable monitoring complexity through clear threshold-based decision rules.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20220217802A1Sidelink interface states for control signaling in v2x

Publication Date: 2022.07.07 KYOCERA CORP

AI summary

The methods, devices, and systems discussed herein define sidelink interface (e.g. PCS) states for a unicast connection between two wireless communication devices. A Sidelink-CONNECTED state is a sidelink interface state in which a first wireless communication device establishes and maintains a sidelink channel connection with a second wireless communication device. The first and second wireless communication devices can transmit sidelink unicast transmissions to each other over the sidelink channel connection while operating in the Sidelink-CONNECTED state. A non-Sidelink-CONNECTED state is a sidelink interface state other than the Sidelink-CONNECTED state. The first and second wireless communication devices transition from the Sidelink-CONNECTED state to the non-Sidelink-CONNECTED state upon the occurrence of a triggering event such as a Radio Link Failure.