Priority-Based Sidelink Channel Access Over Unlicensed Bands

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing channel access procedures for sidelink (SL) transmissions over unlicensed bands, leading to potential resource wastage and delayed signal acquisition.

Innovation Solution

A user equipment (UE) and base station (BS) are equipped with processors and transceivers to determine channel availability and occupy it based on SL ProSe per packet priority (PPPP) for a specified time duration, enabling efficient SL communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the channel access procedure uses fixed time durations for sensing and occupation, then the procedure is simple to implement, but it cannot adapt to different priority levels causing resource wastage and delayed signal acquisition

Engineering Contradiction:

Improveadaptability to different priority levelsVSAvoidcomplexity of channel access procedure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the sensing time duration and channel occupation time dynamic parameters that vary based on SL PPPP priority levels. Instead of fixed durations, the system adjusts these time parameters dynamically according to the priority of the sidelink communication, allowing high-priority traffic to use shorter sensing times and low-priority traffic to use longer sensing times for better channel assessment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters of the channel access procedure (sensing time duration, channel occupation time) based on the SL PPPP priority level. Different priority levels map to different parameter sets, enabling the system to adapt its behavior to the urgency and importance of the communication without requiring complex decision logic.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the sensing time duration is extended to ensure channel availability, then channel access reliability improves, but signal acquisition time increases causing delays

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidsignal acquisition time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent resolves this contradiction by changing the sensing time parameter based on priority levels. For high-priority sidelink communications, the sensing time is reduced to enable faster signal acquisition, while for low-priority communications, the sensing time is extended to ensure higher channel access reliability. This parameter adaptation allows the system to optimize the trade-off between reliability and speed based on the specific communication requirements.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the channel occupation time is increased to ensure complete transmission, then transmission reliability improves, but resource efficiency decreases due to prolonged channel blocking

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidresource efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by adjusting the channel occupation time duration according to SL PPPP priority levels. High-priority transmissions are allocated longer occupation times to ensure complete and reliable transmission, while low-priority transmissions use shorter occupation times to minimize channel blocking and improve overall resource efficiency. This dynamic parameter adjustment optimizes both reliability and productivity based on traffic priority.

Inventive Principle:

Principle #35Parameter changes

4Speed

If the sensing time is reduced for faster access, then signal acquisition speed improves, but channel assessment accuracy decreases leading to potential collisions

Engineering Contradiction:

Improvesignal acquisition speedVSAvoidchannel assessment accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent resolves this contradiction by changing the sensing time parameter based on priority levels. For high-priority communications requiring fast signal acquisition, the sensing time is reduced to improve speed, accepting slightly lower assessment accuracy. For low-priority communications where collisions are less critical, the sensing time is extended to improve measurement precision. This priority-based parameter adaptation allows the system to optimize speed for urgent traffic while maintaining adequate assessment accuracy for non-urgent traffic.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12484087B2Channel access procedure for SL transmission over unlicensed band

Publication Date: 2025.11.25 SAMSUNG ELECTRONICS CO LTD

AI summary

Methods and apparatuses for a channel access in a wireless communication systems. A method of a UE in a wireless communication system, the method comprising: determining whether, for a first time duration, a channel is sensed as an idle state for a channel access procedure; occupying the channel for a second time duration based on a determination that the channel is sensed as the idle state; and transmitting, for at least a portion of the second time duration, a signal on the channel, wherein the first time duration and the second time duration are based on a SL PPPP for a SL communication.