Sidelink Resource Selection Windows for Dynamic Type 2 LBT Timing
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Solution Overview
Problem
The increasing demand for mobile broadband communication and V2X services in wireless communication systems necessitates efficient resource allocation and channel access mechanisms, particularly in unlicensed bands, to address the overhead of base stations and ensure reliable, low-latency transmissions.
Innovation Solution
A method and device for performing wireless communication that involves obtaining information on the duration of type 2 listen before talk (LBT)-based transmissions, triggering resource selection, and determining a selection window for sidelink candidate resources based on sensing, enabling the selection of optimal transmission resources within this window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If type 2 listen before talk (LBT)-based transmission is performed in unlicensed bands, then channel access efficiency is improved, but transmission timing flexibility is reduced due to fixed time duration constraints
Solution Approach 1:
The patent applies dynamics by making the selection window size configurable and adaptable. The window size can be adjusted based on the number of LBT-based transmissions, allowing the system to transition from fixed to dynamic resource selection. This resolves the contradiction by enabling timing flexibility (adaptability) while maintaining the efficiency benefits of LBT-based transmission.
Solution Approach 2:
The patent changes the parameter of selection window size based on transmission conditions. When the number of LBT-based transmissions exceeds a threshold, the window size is adjusted to a different value than when the threshold is not exceeded. This parameter adaptation allows the system to optimize between channel access efficiency and transmission timing flexibility depending on current network conditions.
2Reliability
If resource selection is triggered frequently to adapt to changing channel conditions, then transmission reliability is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple selection window sizes and establishing threshold values for the number of LBT-based transmissions. The UE is provided with a set of selection window sizes and configured with a threshold through higher layer signaling in advance. This allows the system to make reliable resource selections without complex real-time calculations, reducing processing complexity while maintaining transmission reliability.
3Measurement precision
If a larger selection window is used to provide more sidelink candidate resources, then resource selection accuracy is improved, but latency increases due to extended sensing period
Solution Approach 1:
The patent applies dynamics by adjusting the selection window size based on the number of LBT-based transmissions. When the number of transmissions is below a threshold, a larger window size is used for better resource selection accuracy. When the threshold is exceeded, a smaller window size is used to reduce sensing latency. This dynamic adaptation resolves the contradiction between selection accuracy and latency.
Solution Approach 2:
The patent changes the selection window size parameter according to transmission conditions. The UE is configured with multiple window sizes and selects appropriate sizes based on whether the number of LBT-based transmissions exceeds the threshold. This parameter variation allows the system to optimize the balance between resource selection accuracy and sensing latency for different traffic conditions.
Data Source
AI summary
Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise: obtaining information related to a time duration which a type 2 listen before talk (LBT)-based transmission is performed; triggering a resource selection; determining a selection window based on the resource selection being triggered; and determining a set of sidelink (SL) candidate resources within the selection window based on sensing. For example, a first SL transmission resource among the set of SL candidate resources may selected within the time duration within the selection window.