CSI Reporting Latency Bounds for Dual-Carrier Channel Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing channel state information (CSI) report latency, which affects the efficiency and reliability of data transmission in mobile networks.
Innovation Solution
Implementing mechanisms to optimize the reporting of CSI by reducing latency through enhanced protocol stack configurations and adaptive channel management strategies, including reflective mapping and dynamic scheduling, to improve data flow and reduce latency in NR user planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional CSI reporting mechanisms are used, then the system maintains standard protocol operation, but CSI report latency increases and data transmission efficiency decreases
Solution Approach 1:
The patent implements dynamic CSI reporting where the UE adapts reporting timing and content based on channel conditions and network requirements. The network can dynamically adjust reporting configurations through RRC signaling, allowing the system to optimize between latency and overhead based on current operational needs, thereby reducing CSI report latency while maintaining efficient data transmission.
Solution Approach 2:
The patent changes key parameters of CSI reporting including reporting timing, frequency, and content based on channel state and network conditions. By dynamically adjusting these parameters, the system reduces latency-critical reporting delays while optimizing data transmission efficiency, resolving the contradiction between timely CSI feedback and overall transmission performance.
2Measurement precision
If CSI reporting frequency is increased to improve accuracy, then channel state information quality improves, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent implements partial CSI reporting where the UE reports only the most critical channel state parameters or a subset of CSI elements based on channel conditions and network requirements. This approach maintains sufficient measurement precision for effective scheduling while significantly reducing signaling overhead and processing complexity compared to full CSI reporting.
Solution Approach 2:
The network dynamically adjusts CSI reporting parameters including the granularity and detail level of reported information based on current channel conditions and network load. When channel conditions are stable, less frequent or coarser reporting suffices, reducing overhead. When conditions change rapidly, more detailed reporting is triggered to maintain accuracy, thus balancing measurement precision with signaling overhead.
3Productivity
If reflective mapping is implemented for data flow, then data transmission efficiency improves, but protocol configuration complexity increases
Solution Approach 1:
The patent implements reflective mapping where the UE autonomously determines uplink data flow characteristics based on downlink channel conditions and self-configures appropriate reporting parameters without extensive network intervention. This self-service approach improves data transmission efficiency through adaptive resource allocation while minimizing protocol configuration complexity by reducing the need for complex network-side configuration and management.
Data Source
AI summary
A first wireless device transmits, to a second wireless device one or more RRC messages indicating a time duration of a latency bound for reporting a CSI of first and second carriers. An expiration of the time duration is associated with a cancellation of reporting of the CSI and the latency bound is associated with one or more resource pools of each carrier. The first device transmits, to the second wireless device and via the first carrier, respective first and second SCIs requesting CSIs of each carrier, and receives respective first and second MAC CEs comprising the CSIs of each carrier before expiration of the time duration after the transmitting the SCIs.