UE Ranging Response Control via Channel Busy Ratio

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Solution Overview

Problem

In Vehicle-to-Everything (V2X) communication, accurate inter-user equipment (UE) ranging is challenging due to issues like half-duplex problems, signal collision, and performance degradation when multiple UEs are concentrated, necessitating effective load and congestion control methods.

Innovation Solution

A method for a user equipment (UE) to determine the maximum number of ranging response signals based on the channel busy ratio (CBR), prioritize responses based on reception power, transmission period, and service priority, and adjust transmission resources and power to manage congestion and interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple ranging response signals are transmitted to all successfully decoded ranging request signals, then measurement precision is improved, but device complexity increases and energy consumption increases

Engineering Contradiction:

Improveranging accuracyVSAvoidsignal processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies partial action by transmitting ranging response signals selectively to only some of the successfully decoded ranging request signals rather than all of them. The UE determines a maximum number of response signals based on CBR measurements, and when the number of decoded requests exceeds this maximum, it prioritizes which requests to respond to based on reception power, transmission period, or service priority, thereby reducing complexity while maintaining adequate ranging accuracy

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the parameter of response signal transmission by dynamically adjusting the maximum number of response signals based on channel busy ratio (CBR) measurements. The CBR value determines the threshold for responding to ranging requests, allowing the system to adapt transmission parameters to current channel conditions and reduce unnecessary signaling complexity

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple ranging response signals are transmitted to all successfully decoded ranging request signals, then measurement precision is improved, but use of energy increases

Engineering Contradiction:

Improveranging accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent reduces energy consumption by transmitting ranging response signals to only a limited number of prioritized requests rather than all decoded requests. The UE selectively responds based on priority criteria, performing partial action that conserves energy while still providing sufficient ranging responses for accurate distance measurement

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent dynamically changes the transmission parameter of response signal quantity based on CBR measurements. When CBR is high indicating congested channels, the maximum number of response signals is reduced, thereby lowering energy consumption during periods of high network activity

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If ranging request signals are transmitted in concentrated situations, then measurement precision is improved, but object-generated harmful factors increase

Engineering Contradiction:

Improveranging accuracyVSAvoidsignal collision

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent implements feedback mechanisms where UEs measure channel busy ratio (CBR) and use this information to control the transmission of ranging request signals. The CBR measurement provides feedback about channel congestion, and this feedback is used to adjust transmission behavior, reducing signal collision in concentrated situations while maintaining ranging accuracy through selective response transmission

Inventive Principle:

Principle #23Feedback

4Measurement precision

If ranging request signals are transmitted in concentrated situations, then measurement precision is improved, but reliability decreases

Engineering Contradiction:

Improveranging accuracyVSAvoidcommunication reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent uses CBR measurement feedback to dynamically adjust ranging signal transmission parameters. When channel congestion is detected through CBR measurements, the system reduces the number of response signals transmitted, thereby improving reliability by avoiding overwhelming the channel while still maintaining adequate ranging accuracy through selective responses

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11516692B2Distance measurement method of user equipment in wireless communication system and terminal using method

Publication Date: 2022.11.29 LG ELECTRONICS INC

AI summary

A distance measurement method of user equipment in a wireless communication system is provided. The method comprises receiving a plurality of ranging request signals and transmitting a plurality of ranging response signals for the plurality of ranging request signals, wherein the number of transmitted ranging response signals is less than or equal to a maximum response signal number, and the maximum response signal number is determined on the basis of a channel busy ratio (CBR) measured by the terminal.