MAC CE Based CSI Report Configuration for Low Latency Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring channel state information (CSI) reports, particularly for UEs traveling across geographical regions, where existing methods like RRC messaging incur high overhead and latency, especially for high-mobility UEs.
Innovation Solution
The use of Medium Access Control (MAC) Control Element (CE) messages to update CSI report configurations, which include identifiers for channel and interference measurement resources, allowing for quick and low-overhead updates of CSI resource indications, thereby facilitating efficient CSI measurement and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC messaging is used to configure CSI reports, then configuration completeness is improved, but overhead and latency increase
Solution Approach 1:
The configuration is divided into two parts: essential parameters are configured via RRC messaging for completeness, while dynamic resource indications are updated through MAC CE messages for efficiency. This segmentation allows the system to maintain configuration reliability while reducing latency for updates.
Solution Approach 2:
MAC CE messages serve as an intermediary mechanism between full RRC reconfiguration and simple ACK/NACK responses. This intermediary approach enables efficient updates of CSI resource indications without the overhead of complete RRC messaging, thereby reducing latency while maintaining necessary configuration updates.
2Measurement precision
If RRC messaging is used to update CSI resource indications, then configuration accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential resource indication fields from the complete RRC configuration and updates them through compact MAC CE messages. This extraction approach maintains configuration accuracy for critical parameters while significantly reducing signaling overhead compared to transmitting full RRC messages.
Solution Approach 2:
The system dynamically selects the update mechanism based on what needs to be changed: static parameters are configured once via RRC, while dynamic resource indications are updated via MAC CE. This dynamic approach optimizes the balance between accuracy and overhead based on actual configuration needs.
3Measurement precision
If frequent RRC updates are performed for mobile UEs, then tracking accuracy is improved, but system efficiency deteriorates
Solution Approach 1:
Instead of continuous RRC updates, the system implements periodic or event-triggered MAC CE updates for CSI resource indications. This periodic action maintains tracking accuracy for mobile UEs while avoiding the inefficiency of frequent full RRC reconfiguration cycles.
Solution Approach 2:
The MAC CE messages contain simplified copies or references to the full RRC configuration, allowing the system to update critical tracking information without transmitting complete configuration sets. This copying approach maintains tracking accuracy while preserving system efficiency.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for channel state information report configuration. One method (600) includes transmitting (602) a medium access control control element message corresponding to a channel state information report configuration, wherein the medium access control control element message comprises: a channel state information report configuration identifier; and a channel state information resource configuration identifier for channel measurement.