Partial Sensing Resource Selection for Sidelink Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink communication resources, particularly in handling partial sensing for resource selection in sidelink communication systems.
Innovation Solution
A method and apparatus for a device to perform sidelink communication by triggering partial sensing-based resource selection in a Transmission Time Interval (TTI) within a sidelink resource pool, determining a set of candidate TTIs, and excluding candidate sidelink resources not monitored in a subsequent TTI to select available sidelink resources for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full sensing-based resource selection is performed in all candidate TTIs, then resource selection reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The resource selection window is divided into multiple candidate TTIs, and the sensing operations are segmented accordingly. The device performs sensing in specific candidate TTIs based on the resource selection window size, rather than uniformly sensing all TTIs. This segmentation allows the device to focus sensing efforts where they are most needed, reducing overall complexity while maintaining reliability.
Solution Approach 2:
The patent implements partial sensing by performing sensing operations in only some of the candidate TTIs rather than all of them. Specifically, when the resource selection window size is 200ms or larger, sensing is performed in the first candidate TTI and every second candidate TTI thereafter. This partial action approach reduces the number of sensing operations while still providing sufficient information for reliable resource selection.
2Measurement precision
If sensing is performed in all candidate TTIs, then resource selection accuracy is improved, but energy consumption increases
Solution Approach 1:
The device performs partial sensing by selectively sensing only in certain candidate TTIs based on the resource selection window size. When the window is 200ms or larger, sensing is performed in the first candidate TTI and every second candidate TTI, reducing the total number of sensing operations and thus energy consumption, while still maintaining sufficient accuracy for resource selection.
Solution Approach 2:
The sensing operations are performed periodically at regular intervals within the resource selection window. Instead of continuous sensing in every candidate TTI, the device senses in a periodic pattern (every second candidate TTI), which reduces energy consumption while maintaining the ability to detect resource availability accurately.
3Adaptability or versatility
If the resource selection window size is increased, then resource selection flexibility is improved, but the number of sensing operations increases
Solution Approach 1:
The sensing operation pattern is made dynamic based on the resource selection window size. When the window size is smaller than 200ms, sensing is performed in all candidate TTIs. When the window size is 200ms or larger, sensing is performed in a reduced pattern (first candidate TTI and every second candidate TTI). This dynamic adaptation allows the system to maintain flexibility for different window sizes while reducing complexity for larger windows.
Solution Approach 2:
The patent changes the sensing operation parameters based on the resource selection window size parameter. By adjusting the sensing frequency and pattern according to the window size, the system optimizes the balance between flexibility and complexity. Larger windows allow for less frequent sensing operations, reducing the total number of sensing operations required.
4Use of energy by moving object
If partial sensing is implemented by skipping candidate TTIs, then energy consumption is reduced, but resource selection reliability may deteriorate
Solution Approach 1:
The device performs sensing in the first candidate TTI of the resource selection window, which provides preliminary information about resource availability early in the window. This preliminary sensing action allows the device to make informed decisions about resource selection without needing to sense every subsequent candidate TTI, reducing energy consumption while maintaining reliability through the early establishment of baseline resource conditions.
Solution Approach 2:
The patent implements skipping of certain candidate TTIs in the sensing process, specifically skipping every other candidate TTI when the resource selection window is 200ms or larger. This skipping approach reduces the number of sensing operations and energy consumption, while the strategic selection of which TTIs to skip ensures that sufficient sampling is performed to maintain resource selection reliability.
Data Source
AI summary
A method and apparatus are disclosed for a device to perform sidelink communication. The device triggers or requests to perform partial sensing-based resource selection in a first Transmission Time Interval (TTI) in a sidelink resource pool. The device also derives or determines a set of candidate TTIs within a resource selection window in response to the trigger or request, wherein sidelink resources in the set of candidate TTIs are candidate sidelink resources. Furthermore, when the device does not perform sensing in a second TTI, the device excludes a number of candidate sidelink resources, from the candidate sidelink resources, associated with the second TTI, wherein the second TTI is after the first TTI and before the first candidate TTI of the set of candidate TTIs. The device further derives or determines a set of sidelink resources, from the candidate sidelink resources at least excluding the number of candidate sidelink resources.