NR V2X Resource Grid Alignment for UL and Sidelink BWPs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource allocation for sidelink (SL) communication in NR V2X scenarios, particularly in scenarios where different sub-carrier spacings (SCS) for uplink (UL) and SL transmissions lead to misaligned resource block boundaries, causing inefficiencies and potential delays.
Innovation Solution
A method and device for determining UL and SL resource grids based on different SCS, allowing for synchronized UL and SL transmissions by aligning or deactivating bandwidth parts (BWPs) to ensure efficient communication, even when RB boundaries do not match, and providing mechanisms for out-of-coverage UEs to utilize pre-configured resource pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different sub-carrier spacings (SCS) are used for uplink and sidelink transmissions, then communication flexibility and adaptability are improved, but resource block boundary misalignment occurs causing transmission delays and inefficiencies
Solution Approach 1:
The patent applies dynamics by enabling dynamic switching between different numerologies (SCS configurations) for UL and SL transmissions. The system can adaptively select whether to use matching or non-matching SCS based on transmission requirements, allowing flexible resource allocation while managing boundary alignment issues through configurable parameter adjustments.
Solution Approach 2:
The patent changes physical parameters by allowing different sub-carrier spacing values for UL and SL transmissions. By configuring separate SCS parameters for each transmission type, the system optimizes resource utilization while addressing boundary misalignment through parameter-based alignment mechanisms or deactivation conditions when mismatches occur.
2Productivity
If resource block boundaries are aligned between uplink and sidelink transmissions, then transmission efficiency is improved, but system flexibility and adaptability to different SCS configurations are reduced
Solution Approach 1:
The system dynamically adjusts resource grid configuration based on transmission needs. When SCS values differ between UL and SL, the system can deactivate SL BWP or adjust resource allocation strategies, providing flexible adaptation while maintaining efficiency through conditional alignment mechanisms.
Solution Approach 2:
The patent segments the resource allocation into separate UL and SL bandwidth parts with independent SCS configurations. This segmentation allows each transmission type to use optimal parameters while managing boundary issues through separate control, enabling both efficiency and flexibility through independent optimization.
3Reliability
If sidelink bandwidth part is deactivated when SCS do not match, then transmission reliability is improved by avoiding misalignment errors, but communication availability and connectivity are reduced
Solution Approach 1:
The system implements feedback mechanisms where the gNodeB monitors SCS configuration and provides instructions to UEs about appropriate resource grid usage. When mismatches are detected, the system can provide corrective feedback through reconfiguration or deactivation instructions, ensuring reliable transmission while maintaining availability through network-coordinated resource allocation.
Data Source
AI summary
According to one embodiment of the present disclosure, a method by which a first device performs wireless communication is provided. The method comprises the steps of: determining a UL resource grid in a UL BWP of a carrier on the basis of a first SCS; determining an SL resource grid in an SL BWP of the carrier on the basis of a second SCS; and allowing UL transmission to a base station or SL transmission to a second device on the basis of the UL resource grid or the SL resource grid, wherein the SL BWP or the UL BWP can be deactivated on the basis of the first SCS and the second SCS being the same and the RB boundary of the UL resource grid and the RB boundary of the SL resource grid not matching.