Sidelink Sync Signal Selective Transmission

Solution Overview

Problem

In wireless communication systems, there is a need to reduce power consumption and interference in remote user equipment (UE) by selectively transmitting sidelink synchronization signals (SLSS) only for discovery, as transmitting all SLSS leads to unnecessary power consumption and interference in neighboring cells.

Innovation Solution

A method where a remote UE receives configuration information related to SLSS, determines whether the signal is for sidelink communication or discovery, and transmits only the SLSS related to sidelink discovery, thereby optimizing power usage and reducing interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all SLSS are transmitted from remote UE, then synchronization coverage is improved, but power consumption increases and interference in neighboring cells worsens

Engineering Contradiction:

Improvesynchronization coverageVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments SLSS into two distinct types: SLSS for sidelink communication and SLSS for sidelink discovery. Remote UEs are configured to transmit only the discovery-type SLSS, while communication-type SLSS transmission is restricted to relay UEs. This segmentation resolves the contradiction by enabling synchronization coverage through discovery signal transmission while preventing excessive power consumption and interference by eliminating redundant communication signal transmissions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements partial action by having remote UEs transmit only a subset of SLSS (specifically, only the discovery-type SLSS) rather than all SLSS types. This partial transmission approach maintains sufficient synchronization coverage for discovery purposes while avoiding the excessive power consumption and interference that would result from transmitting all SLSS types including communication-type signals.

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If all SLSS are transmitted from remote UE, then synchronization coverage is improved, but interference in neighboring cells increases

Engineering Contradiction:

Improvesynchronization coverageVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments SLSS into two distinct types: SLSS for sidelink communication and SLSS for sidelink discovery. Remote UEs are configured to transmit only the discovery-type SLSS, while communication-type SLSS transmission is restricted to relay UEs. This segmentation resolves the contradiction by enabling synchronization coverage through discovery signal transmission while preventing excessive power consumption and interference by eliminating redundant communication signal transmissions.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If remote UE transmits SLSS for both communication and discovery, then functionality is improved, but device complexity increases

Engineering Contradiction:

ImprovefunctionalityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments SLSS into two distinct types: SLSS for sidelink communication and SLSS for sidelink discovery. Remote UEs are configured to transmit only the discovery-type SLSS, while communication-type SLSS transmission is restricted to relay UEs. This segmentation resolves the contradiction by enabling synchronization coverage through discovery signal transmission while preventing excessive power consumption and interference by eliminating redundant communication signal transmissions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements multi-functionality through relay UEs that can perform both discovery SLSS transmission and communication SLSS transmission. This universal capability allows a single UE type (relay UE) to fulfill multiple functions, maintaining system versatility while simplifying the remote UE's role to only discovery signal transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11337172B2Method for transmitting or receiving sidelink synchronization signal in wireless communication system and apparatus therefor

Publication Date: 2022.05.17 LG ELECTRONICS INC

AI summary

The present disclosure provides a method for transmitting and receiving a sidelink synchronization signal (SLSS) in a wireless communication system. In detail, the method performed by a first terminal includes receiving configuration information related to the SLSS; receiving the SLSS from a second terminal; determining whether the received SLSS is an SLSS related to sidelink communication or an SLSS related to sidelink discovery based on the received configuration information; and transmitting the received SLSS when the received SLSS is the SLSS related to sidelink discovery. Through this, the method proposed in the present disclosure has the effect of reducing unnecessary battery consumption of the first terminal and minimizing interference in the terminals of the neighboring cell.