V2X Scheduling Information Transmission Using DMRS Cyclic Shift Indexing

Solution Overview

Problem

In wireless communication systems, especially in V2X operations, the reception UE faces challenges with blind decoding (BD) due to unclear service targeting, leading to increased latency and power consumption, as it must perform multiple blind decodings for various assumptions without predefined configurations.

Innovation Solution

A method where the UE transmits scheduling information based on repeated transmission of a basic unit or predefined resource, using index information related to a sequence applied to a reference signal, which is configured through higher layer or physical layer signaling, reducing the number of blind decodings by explicitly conveying transmission timing and repetition number.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the reception UE performs blind decoding for various assumptions to determine service targeting, then the system can support multiple services with different requirements, but the latency and power consumption increase significantly

Engineering Contradiction:

Improveservice support capabilityVSAvoiddecoding latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The transmission UE performs preliminary actions by applying different cyclic shift values to DMRS sequences based on the number of repeated transmissions and transmission timing. This preliminary encoding allows the reception UE to identify service type and transmission parameters without performing multiple blind decodings, thus reducing latency while maintaining multi-service support capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the cyclic shift parameter of the DMRS sequence according to the number of repeated transmissions and transmission timing. By varying this parameter, the system can indicate different service types and transmission configurations, allowing the reception UE to determine service targeting without exhaustive blind decoding, thereby reducing decoding latency

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the reception UE performs blind decoding for various assumptions to determine service targeting, then the system can support multiple services with different requirements, but the power consumption increases significantly

Engineering Contradiction:

Improveservice support capabilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The transmission UE performs preliminary actions by applying different cyclic shift values to DMRS sequences based on the number of repeated transmissions and transmission timing. This preliminary encoding allows the reception UE to identify service type and transmission parameters without performing multiple blind decodings, thus reducing power consumption while maintaining multi-service support capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the cyclic shift parameter of the DMRS sequence according to the number of repeated transmissions and transmission timing. By varying this parameter, the system can indicate different service types and transmission configurations, allowing the reception UE to determine service targeting without exhaustive blind decoding, thereby reducing power consumption

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the UE transmits scheduling information with repeated transmissions to improve reliability, then the transmission reliability increases, but the complexity of determining transmission parameters increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidparameter determination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the cyclic shift parameter of the DMRS sequence according to the number of repeated transmissions and transmission timing. This parameter change provides an explicit indication mechanism that helps the reception UE determine transmission parameters without increasing complexity, while maintaining improved transmission reliability through repeated transmissions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The cyclic shift value acts as an intermediary that conveys information about the number of repeated transmissions and transmission timing. Instead of requiring the reception UE to complexly analyze multiple parameters, the cyclic shift serves as a mediator that encodes this information in a readily identifiable manner, reducing determination complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11924824B2Method for transmitting scheduling information related to V2X operation in wireless communication system and terminal using method

Publication Date: 2024.03.05 LG ELECTRONICS INC

AI summary

The present disclosure provides a method for transmitting scheduling information in a wireless communication system performed by a user equipment (UE) that supports a vehicle-to-everything (V2X) operation, including transmitting the scheduling information based on a predefined resource or a repeated transmission of a basic unit, wherein the UE transmits the scheduling information by reflecting index information of a sequence applied to a reference signal related to the transmission of the scheduling information, and wherein the index information has different values depending on the number of the repeated transmissions, a transmission timing of the scheduling information, or a transmission type.