LBT Resource Selection Using COT-Aware Sensing Windows
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel access and resource allocation, particularly in unlicensed bands, which affect data transmission rates and latency, especially in emerging technologies like 6G that require high data rates and low latency.
Innovation Solution
A method for performing wireless communication by a first device, involving obtaining channel occupancy time (COT) information, triggering a resource selection procedure, and selecting resources based on sensing, to optimize transmission in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Listen-Before-Talk (LBT) procedure is used for channel access in unlicensed bands, then channel access efficiency is improved, but transmission latency increases due to channel sensing and backoff requirements
Solution Approach 1:
The patent applies preliminary action by performing channel sensing and LBT procedures in advance before actual data transmission. The transmitting device senses the channel status and completes backoff requirements beforehand, so that when transmission is ready, the channel is already confirmed available, reducing actual transmission latency while maintaining access efficiency
Solution Approach 2:
The patent implements dynamics by making the LBT procedure configurable with different types (Type 1, Type 2A, Type 2B, Type 2C) and adjustable parameters such as sensing slot durations and contention window sizes. This allows the system to dynamically adapt the strictness of channel access based on traffic conditions, balancing access efficiency and latency requirements
2Reliability
If channel sensing and LBT procedures are implemented, then channel access reliability is improved, but data transmission rate decreases due to time spent on channel assessment
Solution Approach 1:
The patent applies partial action by implementing different LBT types with varying degrees of channel sensing strictness. Type 2C requires no sensing, Type 2B requires minimal sensing, Type 2A requires moderate sensing, and Type 1 requires extensive sensing with random backoff. This allows the system to apply only the necessary level of channel assessment for each transmission, maintaining reliability when needed while maximizing transmission rate when possible
Solution Approach 2:
The patent implements parameter changes by allowing dynamic adjustment of LBT parameters including sensing slot duration (9 microseconds or 25 microseconds), contention window size, and maximum channel occupancy time. These parameters can be modified based on channel conditions and traffic requirements, enabling the system to optimize the balance between access reliability and transmission rate
3Productivity
If resource selection is based on sensing in a selection window, then resource allocation efficiency is improved, but device complexity increases due to sensing and selection procedures
Solution Approach 1:
The patent applies segmentation by dividing the channel access process into distinct phases: channel sensing phase, resource selection phase, and transmission phase. The selection window is segmented into multiple sensing opportunities, allowing the device to incrementally gather channel information and make resource selections based on accumulated data, reducing overall complexity through structured processing
Data Source
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AI summary
Proposed is a method for a first device carrying out wireless communication and a device supporting same. For example, the first device may acquire COT-related information. For example, the first device may trigger a resource selection-related procedure. For example, the first device may select a resource in a selection window on the basis of sensing. For example, the first device may carry out transmission on the basis of the selected resource. For example, the selection window may be determined on the basis of the COT-related information.