D2D Service Continuity via PC5 Sidelink State Handover

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Solution Overview

Problem

Current mechanisms for maintaining service continuity in direct device-to-device communication are inadequate when devices move out of range, leading to disrupted connections.

Innovation Solution

Implementing methods and systems for improved service continuity through direct device-to-device communication by utilizing PC5 interfaces, QoS models, and notification procedures to manage sidelink state transitions and ensure seamless handover between devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If direct device-to-device communication is established, then communication speed and efficiency are improved, but connection reliability deteriorates when devices move out of range

Engineering Contradiction:

Improvecommunication speedVSAvoidconnection reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent introduces a base station as an intermediary to establish indirect communication paths between devices. When direct device-to-device communication is no longer viable due to out-of-range conditions, the base station mediates the communication by receiving data from one device and forwarding it to the other, thereby maintaining connection reliability while preserving the efficiency benefits of direct communication when available

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements dynamic path selection that adapts to changing communication conditions. The system continuously monitors device proximity and communication quality, switching between direct device-to-device paths and indirect base station paths based on real-time conditions, thus maintaining both speed and reliability across varying scenarios

Inventive Principle:

Principle #15Dynamics

2Reliability

If service continuity mechanisms are added to maintain connections, then connection reliability is improved, but system complexity increases

Engineering Contradiction:

Improveservice continuityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables devices to autonomously determine their communication status and initiate appropriate actions without complex centralized control. Devices self-monitor their proximity to other devices and automatically switch between direct and indirect communication modes, reducing the need for complex service continuity mechanisms while maintaining reliability

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The base station serves multiple functions simultaneously: it acts as a relay for indirect communication, provides network management, and coordinates resource allocation. This multi-functionality reduces the need for separate dedicated service continuity mechanisms, thereby improving reliability without proportionally increasing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12501497B2Methods, architectures, apparatuses and systems directed to improved service continuity for out of range proximity wireless transmit/receive devices

Publication Date: 2025.12.16 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products directed to improved service continuity in connection with wireless transmit/receive devices not remaining within proximity/range of each other to continue device-to-device (D2D) communications are provided.