Sidelink Transmission Configuration for Shared-Carrier Interference Mitigation

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Solution Overview

Problem

In shared carrier scenarios, sidelink and uplink communications in 5G networks experience interference due to differing timing references and resource overlap, leading to potential interference and inefficiencies.

Innovation Solution

Implementing interference mitigation strategies such as configuring guard times, reserving unused subcarriers, and enhancing power control to separate sidelink and uplink transmissions in time, frequency, and power domains, using methods like shortening synchronization signal blocks and adjusting power levels based on pathloss compensation factors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If sidelink and uplink communications share the same carrier, then resource utilization is improved, but interference between the two communication types increases

Engineering Contradiction:

Improveresource utilizationVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The shared carrier resources are segmented into distinct time slots, frequency subcarriers, and power levels for sidelink and uplink communications. Guard times are inserted to separate transmissions in time domain, specific subcarriers are reserved and excluded from sidelink usage in frequency domain, and power control mechanisms allocate different power levels to different communication types, thereby reducing interference while maintaining resource sharing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different quality parameters are applied to different portions of the shared carrier resources. Certain subcarriers are designated as unused or protected with higher quality standards to prevent sidelink interference, while other subcarriers allow more flexible usage. Power control parameters are locally adjusted based on the specific communication type and channel conditions, enabling optimized resource allocation with reduced interference

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If guard times are configured to separate sidelink and uplink transmissions, then interference is reduced, but communication efficiency decreases

Engineering Contradiction:

ImproveinterferenceVSAvoidcommunication efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Instead of applying guard times uniformly across all resources, the patent applies guard times partially - only in specific time slots where interference is most likely to occur. Similarly, not all subcarriers are protected, only those most susceptible to interference. This partial application of protection mechanisms reduces the overall impact on communication efficiency while still providing adequate interference mitigation where needed

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

Guard times and resource protection mechanisms are applied periodically rather than continuously. The system dynamically activates protection mechanisms during periods when both sidelink and uplink transmissions are scheduled to overlap, and deactivates them during periods when interference is less likely, thereby maintaining communication efficiency while providing interference protection when necessary

Inventive Principle:

Principle #19Periodic action

3Object-affected harmful factors

If power control is enhanced to mitigate interference, then communication quality is improved, but system complexity increases

Engineering Contradiction:

ImproveinterferenceVSAvoidsystem complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The power control mechanism incorporates feedback from the network element regarding interference levels and channel conditions. The network element monitors the shared carrier and provides feedback signals to user equipment, enabling dynamic adjustment of transmission power to mitigate interference while avoiding the need for complex distributed power control algorithms at each device

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

User equipment automatically adjusts its transmission power based on pre-configured parameters and simple feedback from the network, without requiring complex real-time calculations or coordination with other devices. The power control logic is designed to be self-executing with minimal network intervention, reducing overall system complexity while maintaining effective interference mitigation

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12362892B2Interference mitigation for sidelink transmissions in shared carrier

Publication Date: 2025.07.15 NOKIA TECHNOLOGIES OY

AI summary

Systems, methods, apparatuses, and computer program products for sidelink transmission interference mitigation in shared carrier scenarios are provided. For example, a method can include receiving, at a user equipment, a configuration of sidelink communication from a network element. The method can also include communicating, by the user equipment, using the sidelink communication based on the received configuration. The configuration can be configured to mitigate interference between the sidelink communication and uplink communication.