Channel Access Switching in Wireless Systems

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing channel access switching, particularly in shared spectrum environments, where Listen-Before-Talk (LBT) mechanisms are not optimally adapted to varying resource allocations and transmission success rates, leading to suboptimal performance in 5G networks.

Innovation Solution

A method and apparatus for determining whether and how to perform LBT based on resource allocation thresholds, previous transmission success rates, and LBT outcomes, allowing devices to dynamically adjust LBT strategies for CSI-RS transmission, either by DCI indication or RRC configuration, to optimize channel access in shared spectrum environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LBT is performed for all CSI-RS transmissions, then channel access reliability is improved, but transmission latency increases and channel access efficiency deteriorates

Engineering Contradiction:
Improvechannel access reliabilityVSAvoidtransmission latency
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the LBT execution decision based on the resource allocation size. When the resource allocation is below a threshold, LBT is skipped; when above the threshold, LBT is performed. This conditional parameter change resolves the contradiction by adapting the channel access behavior to the specific transmission requirements, ensuring reliability for large allocations while reducing latency for small allocations.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by making the LBT execution decision flexible and adaptive rather than static. The base station dynamically determines whether to perform LBT based on real-time resource allocation conditions indicated by DCI or RRC configuration. This dynamic approach allows the system to optimize between reliability and latency depending on the current transmission scenario.

Inventive Principle:
Principle #15Dynamics

2Adaptability or versatility

If LBT is performed for all CSI-RS transmissions, then fair spectrum usage is improved, but channel access efficiency deteriorates

Engineering Contradiction:
Improvefair spectrum usageVSAvoidchannel access efficiency
Core Design Contradiction:
Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent changes the operational parameter of LBT execution from a fixed mandatory action to a conditional action based on resource allocation size. This parameter change enables the system to maintain fair spectrum usage for significant transmissions while improving channel access efficiency by skipping LBT for minor transmissions, thus resolving the contradiction between fairness and efficiency.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies partial action by performing LBT only when necessary (for larger resource allocations) rather than for all transmissions. This selective approach ensures fair spectrum usage is maintained for substantial transmissions while avoiding the excessive overhead of LBT for every single transmission, thereby improving overall channel access efficiency.

Inventive Principle:
Principle #16Partial or excessive action

3Productivity

If resource allocation threshold for LBT is increased, then channel access efficiency is improved, but transmission reliability for small allocations deteriorates

Engineering Contradiction:
Improvechannel access efficiencyVSAvoidtransmission reliability for small allocations
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent uses parameter changes by establishing a specific threshold value for resource allocation that determines LBT execution. This threshold parameter is carefully selected to balance efficiency and reliability, ensuring that small allocations below the threshold can proceed without LBT (maintaining efficiency) while larger allocations above the threshold perform LBT (maintaining reliability).

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS20230199836A1Method and apparatus for channel access switch in a wireless communication system
Publication Date: 2023.06.22 ASUSTEK COMPUTER INC
  • US20230199836A1 patent drawing
  • US20230199836A1 patent drawing
  • US20230199836A1 patent drawing

AI summary

Methods and apparatuses are provided for channel access switching in a wireless communication system, with or without Listen-Before-Talk (LBT), and/or with different types of efficiently operated LBT. A device, including a User Equipment (UE) or a base station, can determine whether and/or how to perform LBT for a transmission based on a property of the transmission. The property could be a resource allocation for the transmission. The property could be a way to allocate resources for the transmission. The property could be a length or size of resource allocated for the transmission. The property could be an amount of resources allocated for the transmission. The resource allocation could be a time domain resource allocation and/or a frequency domain resource allocation.