Sidelink Resource Selection for D2D CSI and Data
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Solution Overview
Problem
Current LTE and 5G NR V2X communication systems face challenges in efficiently managing resource allocation for device-to-device (D2D) transmissions, particularly in sidelink (SL) Mode 4, where there is no central node for scheduling, leading to issues like half-duplex constraints, resource fragmentation, and inter-modulation distortion.
Innovation Solution
The proposed method involves identifying overlapping CSI selection windows and data selection windows for D2D transmissions, allowing for the coordinated use of resources to minimize conflicts and optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If autonomous resource selection is used in SL Mode 4, then device complexity is reduced and ease of operation is improved, but resource fragmentation and inter-modulation distortion occur
Solution Approach 1:
The patent combines CSI report transmission and data transmission into a single resource allocation process. By identifying overlapping selection windows for both CSI and data, the system merges previously separate resource selection procedures, allowing coordinated resource selection that prevents fragmentation while maintaining autonomous operation.
Solution Approach 2:
The patent performs preliminary identification of overlapping selection windows between CSI reports and data transmissions before actual resource allocation. This advance planning allows the system to pre-determine resources that satisfy both CSI periodicity requirements and data transmission needs, preventing resource fragmentation before it occurs.
2Ease of operation
If autonomous resource selection is used in SL Mode 4, then device complexity is reduced and ease of operation is improved, but inter-modulation distortion occurs
Solution Approach 1:
The patent merges the resource selection processes for CSI reports and data transmissions by identifying overlapping selection windows. This unified approach ensures that resources allocated for CSI transmission do not create harmful interference with data transmissions, eliminating inter-modulation distortion while preserving autonomous resource selection benefits.
3Reliability
If separate resource allocation is used for CSI reports and data transmissions, then resource conflicts are avoided, but resource utilization efficiency decreases
Solution Approach 1:
The patent merges separate resource allocation procedures for CSI reports and data into a unified process. By identifying overlapping selection windows, the system simultaneously allocates resources for both functions, ensuring conflict-free operation while maximizing resource utilization efficiency through coordinated selection.
Solution Approach 2:
The patent performs preliminary identification of overlapping selection windows before resource allocation. This advance coordination ensures that resources are selected to satisfy both CSI periodicity requirements and data transmission needs simultaneously, achieving both conflict avoidance and high resource utilization.
4Reliability
If CSI selection window and data selection window are separated, then resource conflicts are avoided, but resource utilization efficiency decreases
Solution Approach 1:
The patent combines previously separated CSI selection window and data selection window into an overlapping structure. This merging allows the system to identify common time-frequency resources that satisfy both CSI reporting requirements and data transmission needs, achieving conflict-free operation with improved resource utilization.
Data Source
AI summary
A method of operating a user equipment, UE, for device-to-device, D2D, transmission of a channel state information, CSI, report and/or a CSI reference signal, CSI-RS, is provided. The method may include identifying a CSI selection window containing candidate resources for use in D2D transmission of the CSI report and/or CSI-RS. The method may include identifying a data selection window containing candidate resources for use in D2D transmission of data and which at least partially overlaps a region of the CSI selection window. The method may include controlling transmission of data and the CSI report and/or CSI-RS to use at least one resource that is selected within the overlapping region of the CSI selection window and the data selection window.