Sidelink Carrier Reselection Frequency Optimization

Solution Overview

Problem

Current wireless communication systems face inefficiencies in transmitting sidelink signals when multiple carriers are configured, particularly in device-to-device communication scenarios, where the process of reselecting transmission resources and serving carriers is not optimized, leading to suboptimal performance.

Innovation Solution

A method and apparatus for user equipment to efficiently transmit sidelink signals by configuring a plurality of carriers, periodically setting up an SL resource pool, selecting a serving carrier, and transmitting using a selected transmission resource, with the frequency of reselecting the serving carrier being lower than reselecting the transmission resource, and performing resource reselection based on specific conditions such as packet priority and latency requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the procedure of reselecting the serving carrier is performed at the same frequency as reselecting the transmission resource, then the system can adapt quickly to changing channel conditions, but the signaling overhead and processing complexity increase

Engineering Contradiction:

Improveadaptability to channel conditionsVSAvoidreselection procedure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic reselection mechanisms where the serving carrier and transmission resource are reselected at different frequencies based on system state. The transmission resource reselection occurs more frequently than serving carrier reselection, allowing the system to adapt to changing channel conditions while managing complexity through differentiated reselection rates.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the frequency parameter of reselection procedures by introducing different reselection periods for serving carrier versus transmission resource. This parameter differentiation allows optimized adaptation where transmission resources can be adjusted more frequently than carrier selections, balancing responsiveness with system complexity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the serving carrier is reselected frequently, then the system can maintain optimal transmission performance, but the signaling overhead and processing load increase

Engineering Contradiction:

Improvetransmission performanceVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent implements dynamic reselection mechanisms where the serving carrier and transmission resource are reselected at different frequencies based on system state. The transmission resource reselection occurs more frequently than serving carrier reselection, allowing the system to adapt to changing channel conditions while managing complexity through differentiated reselection rates.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the frequency parameter of reselection procedures by introducing different reselection periods for serving carrier versus transmission resource. This parameter differentiation allows optimized adaptation where transmission resources can be adjusted more frequently than carrier selections, balancing responsiveness with system complexity.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple carriers are configured for sidelink communication, then the system capacity and flexibility increase, but the resource management complexity increases

Engineering Contradiction:

Improvesystem flexibilityVSAvoidresource management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the resource management process by separating transmission resource selection from serving carrier selection. Each has its own independent reselection procedure with different frequency and criteria, allowing multi-carrier sidelink communication to be managed through modular, independent processes rather than a monolithic complex system.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11265872B2Method and apparatus for transmitting sidelink signal in wireless communication system

Publication Date: 2022.03.01 LG ELECTRONICS INC

AI summary

The present invention relates to a wireless communication system and, specifically, to a method and an apparatus therefor, the method comprising: a step of configuring a plurality of carriers to which an SL communication is applied, wherein an SL resource pool is periodically configured in each carrier; a step of selecting one of the plurality of carriers as a serving carrier; a step of selecting a transmission resource among the SL resource pool in the selected carrier; and a step of transmitting the SL signal using the transmission resource, wherein a frequency of a process of reselecting the serving carrier is less than a frequency of a process of reselecting the transmission resource among the SL resource pool in the preselected carrier.