S-SSB Transmission Timing in NR V2X Sidelink

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently transmitting sidelink synchronization signal blocks (S-SSBs) between user equipment (UEs) in vehicle-to-everything (V2X) scenarios, particularly in terms of timing synchronization and data transmission efficiency.

Innovation Solution

A method and apparatus for wireless communication that involve receiving information about the time offset and time interval for S-SSB transmission from a base station, allowing UEs to transmit S-SSBs within a defined period based on this information, ensuring efficient sidelink communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UEs transmit S-SSBs without base station coordination, then transmission flexibility is improved, but timing synchronization deteriorates

Engineering Contradiction:

Improvetransmission flexibilityVSAvoidtiming synchronization

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The base station acts as an intermediary that provides timing reference information to UEs. The UE receives timing offset information from the base station and uses it to determine the transmission timing of S-SSBs, thereby maintaining synchronization while allowing flexible transmission configurations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The base station pre-configures timing offset information and S-SSB period parameters to the UE before the UE transmits S-SSBs. This preliminary configuration enables the UE to autonomously determine transmission timing without real-time coordination, achieving both flexibility and synchronization.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If S-SSB transmission period is extended, then synchronization coverage is improved, but transmission latency increases

Engineering Contradiction:

Improvesynchronization coverageVSAvoidtransmission latency

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The S-SSB transmission is segmented into multiple occasions within a period, with the first S-SSB transmitted at a determined offset and subsequent S-SSBs transmitted at regular intervals. This segmentation allows the system to balance coverage area and latency by adjusting the number and spacing of transmissions within the period.

Inventive Principle:

Principle #1Segmentation

3Reliability

If multiple S-SSBs are transmitted within a period, then synchronization reliability is improved, but resource overhead increases

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system transmits a configurable number of S-SSBs within each period based on coverage requirements and channel conditions. The base station can adjust the S-SSB period and offset parameters to transmit the minimum necessary number of S-SSBs to achieve reliable synchronization, avoiding excessive resource consumption.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11470566B2Method and device for transmitting and receiving S-SSB in NR V2X

Publication Date: 2022.10.11 LG ELECTRONICS INC

AI summary

Provided are a method for performing wireless communication by a first device and a device for supporting same. The method may comprise the steps of: receiving, from a base station, information associated with time offset from a start of a sidelink synchronization signal block (S-SSB) period to a first S-SSB; receiving, from the base station, information associated with a time interval between S-SSBs; and on the basis of at least one of the time offset or the time interval, transmitting one or more S-SSBs to a second device within the S-SSB period.