NR Sidelink Resource Alignment With LTE Subframe Boundaries

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In a coexistence scenario of LTE and NR systems, NR transmissions with higher sub-carrier spacing affect LTE transmission reliability due to power issues in the latter half of LTE subframes, and existing multi-slots solutions fail to align boundaries, causing interference.

Innovation Solution

The method involves obtaining LTE resource pool information, including configuration, location, or boundary, to ensure NR SL transmission either fully overlaps or does not overlap with LTE subframes in time domain, using resource selection based on LTE resource pool information to prevent interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If NR transmissions use higher sub-carrier spacing to improve transmission efficiency, then NR transmission speed increases, but LTE transmission reliability deteriorates due to power issues in the latter half of LTE subframes

Engineering Contradiction:

ImproveNR transmission speedVSAvoidLTE transmission reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent segments the time domain resources by introducing a virtual subframe structure that divides the actual transmission into separate segments. NR transmissions are confined to specific time segments (virtual subframes) that do not overlap with LTE subframes, thereby preventing interference while maintaining high NR transmission speeds through appropriate sub-carrier spacing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a virtual subframe dimension that maps NR transmissions to time resources in a way that avoids conflict with LTE subframes. By using virtual subframe indices and mapping them to actual time slots, the system enables NR high-speed transmissions while preserving LTE reliability through dimensional separation of resource allocation

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If existing multi-slots solutions are used for NR transmission, then resource utilization improves, but boundary alignment fails causing interference with LTE transmission

Engineering Contradiction:

Improveresource utilizationVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic boundary alignment by configuring virtual subframe lengths and NR transmission slot positions based on the specific SCS configuration. The system dynamically adjusts the mapping between virtual subframes and actual time slots to ensure that NR multi-slot transmissions always align with LTE subframe boundaries, preventing interference while maximizing resource utilization

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of sub-carrier spacing (SCS) configuration to determine the relationship between virtual subframes and NR transmission slots. By selecting specific SCS values (30 kHz or higher) and configuring corresponding virtual subframe parameters, the system achieves both high resource utilization and proper boundary alignment with LTE subframes

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250374309A1SL Transmission Method, and Terminal and Non-Transitory Readable Storage Medium

Publication Date: 2025.12.04 VIVO MOBILE COMM CO LTD

AI summary

An SL transmission method includes obtaining, by a first terminal, LTE resource pool information, and performing, by the first terminal, NR SL transmission based on the LTE resource pool information. The LTE resource pool information includes at least one of the following; an LTE resource pool configuration, a location of a resource in an LTE resource pool, or a boundary of an LTE subframe in the LTE resource pool.