Sidelink CSI Reporting With Preconfigured Resources for NR V2X
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Solution Overview
Problem
In NR V2X unicast communication, terminals face challenges in obtaining sidelink resources for CSI transmission, leading to issues such as no available resources when data is absent or resources not meeting maximum allowed transmission delay, rendering CSI useless.
Innovation Solution
A method for obtaining sidelink resources by triggering scheduling requests and utilizing configuration grants to ensure timely CSI feedback, including predefined SR configurations and timers to manage resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal requests sidelink resource by triggering sidelink BSR and SR when sidelink data is absent, then the terminal can obtain sidelink resource for CSI transmission, but this causes resource wastage and increases signaling overhead
Solution Approach 1:
The terminal autonomously selects sidelink resources from a pre-configured resource pool without needing to request resources through BSR/SR procedures. This self-service mechanism eliminates unnecessary signaling overhead while ensuring the terminal can obtain resources for CSI transmission when needed.
Solution Approach 2:
The base station pre-configures a resource pool for sidelink communication before the terminal needs to transmit CSI. This preliminary action ensures resources are readily available when CSI transmission is required, eliminating the need for on-demand resource requests and reducing signaling overhead.
2Reliability
If the terminal uses sidelink resource allocated for data transmission to send CSI, then the terminal can transmit CSI, but the transmission delay exceeds the maximum allowed delay making CSI useless
Solution Approach 1:
The base station pre-configures a dedicated resource pool for sidelink communication that can be immediately used for CSI transmission. This preliminary resource preparation ensures that when CSI needs to be transmitted, the terminal can do so without waiting for data transmission opportunities, thereby meeting the maximum allowed delay requirement.
Solution Approach 2:
The pre-configured sidelink resource pool serves multiple purposes: it can be used for both data transmission and CSI feedback. This multi-functionality ensures that resources are always available for CSI transmission regardless of whether data transmission is occurring, thereby meeting delay requirements while avoiding resource wastage.
3Ease of operation
If the terminal requests sidelink resource through BSR and SR procedures, then the terminal can obtain resource allocation, but the resource allocation cannot meet the maximum allowed transmission delay of CSI
Solution Approach 1:
The terminal autonomously selects resources from a pre-configured pool without needing to go through BSR/SR procedures. This self-service approach eliminates the time-consuming resource request and allocation process, enabling the terminal to immediately transmit CSI within the maximum allowed delay.
Solution Approach 2:
The base station performs preliminary resource configuration by setting up a resource pool in advance. This preliminary action eliminates the need for real-time resource allocation procedures like BSR/SR, allowing the terminal to immediately use pre-approved resources for CSI transmission and meet delay requirements.
Data Source
AI summary
Embodiments of this application provide a method for sending a sidelink channel state information report, an apparatus, and a system. The solution includes: 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 feedback CSI of a sidelink between the first terminal and the second terminal. The solution may be applied to fields such as unmanned driving, automated driving, driver assistance, intelligent driving, connected driving, intelligent network driving, car sharing, and artificial intelligence.