Frequency-Interlaced Waveform Design for NR-U Sidelink

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication systems face challenges in efficiently utilizing shared radio frequency bands for sidelink communications, particularly in meeting bandwidth occupancy requirements and power spectral density limitations, especially in unlicensed spectrum scenarios.

Innovation Solution

The implementation of frequency-interlaced waveforms for sidelink communications, where a base station configures user equipment with frequency-interlaced resource pools, allowing for multiplexing of physical sidelink shared and control channels, and enabling increased bandwidth occupancy while adhering to power spectral density constraints.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional waveforms are used for sidelink communications in shared radio frequency bands, then the system can maintain simpler implementation, but bandwidth occupancy requirements cannot be met and power spectral density limitations are violated

Engineering Contradiction:

Improvebandwidth occupancy capabilityVSAvoidwaveform configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The frequency resource pool is divided into multiple frequency interlaces, where each interlace consists of non-contiguous resource blocks distributed across the frequency band. This segmentation allows the system to achieve higher bandwidth occupancy by utilizing dispersed frequency resources while maintaining manageable complexity through standardized interlace structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station dynamically configures frequency interlace parameters including the number of interlaces, resource blocks per interlace, and interlace spacing based on current bandwidth occupancy requirements and power spectral density constraints. This dynamic adaptation enables the system to optimize performance for different deployment scenarios without requiring complex device-side waveform design.

Inventive Principle:

Principle #15Dynamics

2Reliability

If higher transmit power is used to increase transmission distance and reliability, then communication reliability improves, but power spectral density limitations in unlicensed spectrum are exceeded

Engineering Contradiction:

Improvesidelink communication reliabilityVSAvoidpower spectral density

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

By segmenting the frequency resource into multiple interlaces with distributed resource blocks, the system can spread the transmit power across a wider frequency bandwidth. This allows the total transmit power to remain within regulatory limits while maintaining adequate signal strength through increased frequency diversity and bandwidth utilization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the frequency domain parameters of the waveform by using frequency interlaced resource allocation with specific spacing between resource blocks. This parameter change enables the same transmit power to achieve better effective spectral efficiency and coverage by utilizing frequency diversity, thereby meeting reliability requirements without exceeding power spectral density limits.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If frequency-interlaced waveforms are implemented to meet bandwidth occupancy requirements, then spectrum utilization efficiency improves, but implementation complexity increases

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidfrequency interlace configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The frequency resource pool is segmented into standardized frequency interlaces with defined structures including a specific number of resource blocks per interlace and standardized spacing patterns. This segmentation achieves high spectrum utilization by efficiently packing non-contiguous resource blocks while reducing implementation complexity through standardized, pre-configurable interlace templates that simplify device processing.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If non-contiguous frequency resources are allocated to increase bandwidth occupancy, then spectral efficiency improves, but signal processing complexity increases

Engineering Contradiction:

Improvebandwidth occupancyVSAvoidsignal processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The base station dynamically determines and configures the frequency interlace parameters including the number of resource blocks per interlace, the spacing between resource blocks, and the total number of interlaces based on current bandwidth occupancy requirements. This dynamic configuration allows the system to adapt to different spectral efficiency requirements while maintaining manageable signal processing complexity through centralized control and standardized interlace structures.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11677519B2Waveform design for sidelink in new radio-unlicensed (NR-U)

Publication Date: 2023.06.13 QUALCOMM INC

AI summary

Wireless communications systems and methods related to sidelink communications in a shared radio frequency band are provided. A first user equipment (UE) receives, from a base station (BS), a configuration for frequency-interlaced resources in a shared radio frequency band for sidelink communication between the first UE and a second UE. The first UE communicates, with the second UE, the sidelink communication using the frequency-interlaced resources.