NR V2X Transport Block Sizing by PSCCH Resource Exclusion

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Solution Overview

Problem

In wireless communication systems, particularly in V2X scenarios, there is a need to efficiently determine the transport block size (TBS) for data transmission over sidelink channels, as existing methods are inadequate for optimizing resource allocation and ensuring reliable communication.

Innovation Solution

A method and apparatus for determining TBS in NR V2X communication, involving the calculation of resource elements based on the number of REs in a slot and the PSCCH resource, considering code rate, modulation order, and layer number, while excluding PSCCH resources to optimize TBS determination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing TBS determination methods are used in V2X sidelink communication, then resource allocation can be performed, but resource utilization is not optimized and communication reliability is insufficient

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidresource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts and excludes PSCCH resource elements from the total RE count when determining TBS. By separating control channel resources from data channel resources, the method ensures that TBS calculation only considers REs actually available for data transmission, thereby optimizing resource utilization and improving communication reliability in V2X sidelink scenarios

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent modifies the TBS determination parameters by dynamically calculating the number of available REs based on slot structure and PSCCH resource configuration. This parameter adjustment ensures accurate TBS calculation that reflects actual available resources, resolving the contradiction between reliable communication and efficient resource usage

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If PSCCH resources are included in TBS calculation, then calculation is simplified, but resource allocation accuracy deteriorates

Engineering Contradiction:

ImproveTBS determination accuracyVSAvoidcalculation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the total REs into distinct categories: PSCCH control resources and PSSCH data resources. By applying separate counting rules for each segment, the method achieves precise TBS determination without excessive complexity, as the segmentation follows clear structural boundaries in the sidelink frame

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250247840A1Method and device for determining transport block size in NR v2x

Publication Date: 2025.07.31 LG ELECTRONICS INC

AI summary

Provided are a method for a first device carrying out wireless communication, and a device supporting same. The method may comprise the steps of: determining the number of resource elements (REs) for determining a Transport Block Size (TBS) on the basis of the number of REs in a single slot and the number of REs on a Physical Sidelink Control Channel (PSCCH) resource in the single slot; acquiring an intermediate number associated with the TBS by multiplying the number of REs for determining the TBS, a code rate, a modulation order and the number of layers; quantizing the intermediate number; determining the TBS on the basis of the quantized intermediate number; and transmitting a sidelink (SL) to a second device on the basis of the determined TBS. Here, the number of REs for determining the TBS may be determined by excluding the number of REs on the PSCCH resource.