V2X User Equipment CSI Addressing Through SCI and MAC Headers
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Solution Overview
Problem
The challenge in Vehicle to Everything (V2X) communication is determining the address information for Channel State Information (CSI) reports and ensuring the timeliness of these reports.
Innovation Solution
A method for user equipment (UE) to determine address information for CSI reports by carrying a CSI request trigger in sidelink control information (SCI) and scheduling a physical sidelink shared channel (PSSCH) transmission, with the UE decoding the transfer block (TB) to associate address information with the CSI report, and using layer-1 or layer-2 IDs to confirm the validity and timeliness of the CSI request trigger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE transmits CSI request trigger in SCI and schedules PSSCH transmission, then the address information for CSI report can be determined, but the complexity of the addressing mechanism increases
Solution Approach 1:
The patent uses the MAC subheader as an intermediary element that carries address information between the SCI transmission and the CSI report generation. The MAC subheader acts as a mediator that links the CSI request trigger to the corresponding CSI report, allowing the receiving UE to determine the correct address without complex direct addressing mechanisms.
Solution Approach 2:
The patent applies preliminary action by embedding the address information in the MAC subheader before the CSI report is generated and transmitted. This allows the receiving UE to have the address information ready in advance, eliminating the need for complex real-time address determination mechanisms.
2Reliability
If the UE determines address information from MAC PDU, then the CSI report can be properly routed, but the time required for address determination increases
Solution Approach 1:
The address information is preliminarily embedded in the MAC subheader during the initial PSSCH transmission, allowing the receiving UE to extract and store this information immediately without requiring additional processing time when generating the CSI report.
Solution Approach 2:
The MAC subheader structure is designed to be self-descriptive, containing the necessary address information that the receiving UE can automatically extract and use without requiring complex external lookup tables or additional signaling messages.
3Duration of action of moving object
If the CSI report validity period is extended, then more time is available for report transmission, but the timeliness of the CSI information decreases
Solution Approach 1:
The patent implements periodic action by associating the CSI report with a specific time reference from the SCI transmission. The validity period is structured as a fixed duration from this reference point, creating a predictable periodic pattern that allows the system to balance between extended validity and timeliness requirements.
Solution Approach 2:
The time reference for determining CSI report validity is preliminarily established in the SCI transmission, allowing the receiving UE to calculate the validity period in advance and manage the timeliness of CSI information without requiring continuous validation checks.
Data Source
AI summary
Provided in the present invention is a method performed by user equipment, and user equipment. The method performed by user equipment is a method, performed by user equipment, for determining address information to which a CSI report belongs or corresponds. The method includes the following steps: carrying, by user equipment, a CSI request trigger in SCI, and scheduling transmission of a PSSCH carrying a TB in the SCI, wherein the TB includes an MAC PDU, and an MAC subheader of the MAC PDU includes address information; receiving, by another user equipment, the SCI, receiving the transmission of the PSSCH according to the information in the SCI, and decoding the TB; and generating, by another user equipment, a CSI report, wherein address information of the CSI report is determined by the address information of the CSI request trigger corresponding to the CSI report.