Cross-PLMN Sidelink Resource Scheduling for Collision-Free D2D

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Solution Overview

Problem

Current LTE standards lack mechanisms for coordinating sidelink resource sharing and scheduling between different public land mobile networks (PLMNs) for Device to Device (D2D) communications, particularly in multi-PLMN scenarios, leading to inefficiencies in V2X services like road safety and traffic information applications.

Innovation Solution

A method where a first network node sends transmission configurations and scheduling information to a second network node to enable coordinated sidelink resource management across different PLMNs, allowing UEs to operate in a network scheduled mode or autonomous mode for collision-free direct wireless transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If D2D communication is implemented without coordination between different PLMNs, then device autonomy and communication speed are improved, but resource conflicts and interference between networks worsen

Engineering Contradiction:

Improvecommunication speedVSAvoidresource coordination reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent introduces a serving PLMN as an intermediary that coordinates sidelink resource allocation between UEs from different PLMNs. The serving PLMN receives resource requests, determines appropriate resources, and provides them to the requesting UE, thereby mediating resource conflicts between networks while maintaining fast D2D communication

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the resource management function by separating the serving PLMN (which handles coordination) from the controlling PLMN (which provides resource pools). This segmentation allows each PLMN to maintain its resource management autonomy while enabling coordinated access through the serving PLMN

Inventive Principle:

Principle #1Segmentation

2Productivity

If sidelink resources are shared across multiple PLMNs, then resource utilization efficiency is improved, but scheduling complexity and coordination overhead worsen

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidscheduling coordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements self-service by allowing the serving PLMN to autonomously determine and allocate sidelink resources based on available resource pools from the controlling PLMN. The serving PLMN independently manages resource requests from multiple UEs without requiring complex inter-PLMN negotiation, thereby simplifying coordination while improving resource utilization

Inventive Principle:

Principle #25Self-service

3Loss of time

If UEs use autonomous mode for sidelink transmission, then scheduling overhead is reduced, but resource collision probability increases

Engineering Contradiction:

Improvescheduling overhead timeVSAvoidcollision-free transmission reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent applies preliminary action by having the network (serving PLMN) pre-allocate sidelink resources to UEs before autonomous transmission occurs. This preliminary resource allocation ensures that UEs have designated collision-free resources while still operating in autonomous mode, eliminating the need for real-time coordination during actual data transmission

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3622765B1Resource configurations and scheduling of direct transmissions in multi-network environments

Publication Date: 2025.09.03 MALIKIE INNOVATIONS LTD

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AI summary

In some examples, a first network node of a first network sends, in response to a request from a user equipment (UE) served by a second network, a transmission configuration to a second network node of the second network, the transmission configuration relating to a configuration used for a direct wireless transmission between the UE and a wireless device. The first network node sends scheduling information granting a resource for use by the UE in the direct wireless transmission.