Sidelink CSI Reporting with Preconfigured Resources and Delay Control
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Solution Overview
Problem
In New Radio (NR) V2X unicast communication, terminals face challenges in obtaining sidelink resources for channel state information (CSI) transmission, leading to issues such as no available resources for CSI feedback or resources that do not meet the maximum allowed transmission delay requirements.
Innovation Solution
A method for obtaining sidelink resources for CSI reporting by triggering scheduling requests (SR) and using configuration grants, along with timers and condition-based cancellation to ensure timely and relevant CSI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal uses sidelink resource for data transmission to send CSI, then the terminal can reuse existing resources, but the terminal cannot obtain resources when no data needs to be sent or the resources do not meet CSI delay requirements
Solution Approach 1:
The patent segments the sidelink resource allocation into two distinct types: Type 1 resources configured specifically for CSI reporting and Type 2 resources for data transmission. This segmentation allows the terminal to obtain dedicated CSI resources independent of data transmission needs, resolving the contradiction between resource reuse flexibility and CSI transmission reliability.
Solution Approach 2:
The base station performs preliminary configuration of Type 1 sidelink resources for CSI reporting before the terminal needs to send CSI. This advance configuration ensures that dedicated CSI resources are available when needed, without waiting for data transmission triggers, thereby ensuring reliable CSI transmission regardless of data activity.
2Ease of manufacture
If the terminal waits for data transmission to request sidelink resources, then resource allocation follows existing procedures, but CSI transmission delay exceeds maximum allowed delay
Solution Approach 1:
The base station pre-configures Type 1 sidelink resources specifically for CSI reporting purposes before the terminal needs to transmit CSI. This eliminates the need for the terminal to wait for data transmission triggers or go through complex resource request procedures, directly reducing CSI transmission delay while maintaining simple resource allocation through base station control.
Solution Approach 2:
The Type 1 sidelink resources are configured with multi-functionality, serving both as dedicated CSI reporting resources and as part of the overall sidelink resource pool managed by the base station. This universal approach simplifies resource allocation by integrating CSI resources into the existing base station scheduling framework while ensuring timely CSI transmission.
3Ease of operation
If the terminal sends CSI using scheduled sidelink resources, then resource allocation is controlled by base station, but no dedicated CSI resources are available in current prior art
Solution Approach 1:
The patent segments sidelink resources into Type 1 (CSI-dedicated) and Type 2 (data-oriented) categories. Type 1 resources are specifically allocated for CSI reporting and are managed by the base station through dedicated configuration, providing both base station control and CSI-specific resource availability that current prior art lacks.
Solution Approach 2:
The base station performs preliminary configuration of Type 1 sidelink resources for CSI reporting, establishing dedicated CSI resource pools in advance. This preliminary action enables the terminal to access CSI-specific resources under base station control without relying on data transmission triggers, directly addressing the lack of dedicated CSI resources in current systems.
Data Source
AI summary
When a first sidelink channel state information CSI report is triggered, a first terminal obtains a first sidelink resource configured by a base station for the first terminal, where the first sidelink resource can be used to transmit the sidelink CSI report. The first terminal sends the first sidelink CSI report to a second terminal on the first sidelink resource, where the first sidelink CSI report is used to feed back CSI of a sidelink between the first terminal and the second terminal.