Wireless Channel State Reporting for High Mobility Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel state information (CSI) aging and reference signal (RS) overhead, particularly in scenarios with high mobility and large round-trip time, leading to improper scheduling and increased signaling overhead.
Innovation Solution
The implementation of advanced channel state estimating and reporting schemes that include transmitting and receiving channel state report messages with fields indicative of parameter values and change rates, allowing for flexible reporting configurations and reduced overhead through optimized reporting triggers and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional channel state reporting schemes are used, then signaling overhead is reduced, but scheduling accuracy deteriorates in high mobility scenarios
Solution Approach 1:
The patent implements dynamic channel state reporting by introducing multiple reporting modes (mode 1 for absolute CQI, mode 2 for differential CQI) that can be selected based on channel conditions and mobility characteristics. The network can dynamically configure the reporting mode through RRC signaling, allowing the system to adapt between detailed reporting (when channel is stable) and compact reporting (when mobility is high), thus resolving the contradiction between scheduling accuracy and CSI aging.
Solution Approach 2:
The patent changes the parameter representation in channel state reports by introducing differential CQI reporting where instead of reporting absolute CQI values, the UE reports differential values relative to a reference CQI. This parameter transformation reduces the number of bits required for reporting while maintaining scheduling accuracy, directly addressing the CSI aging problem in high mobility scenarios.
2Reliability
If frequent channel state reporting is implemented, then scheduling accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel state information needed for scheduling by implementing differential CQI reporting. Instead of reporting complete channel state matrices, the system extracts and reports only the CQI differential values, which contain the critical information for scheduling decisions while significantly reducing signaling overhead.
Solution Approach 2:
The patent applies partial action by reporting only the necessary portion of channel state information (differential CQI) rather than complete channel state data. This partial reporting approach provides sufficient information for accurate scheduling while minimizing the signaling overhead, avoiding the excessive action of reporting all possible channel parameters.
3Manufacturing precision
If detailed channel state information is reported, then scheduling precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the channel state reporting into two parts: a reference CQI (reported less frequently or implicitly known) and differential CQI (reported frequently with reduced bits). This segmentation allows the system to maintain scheduling precision through the reference value while reducing device complexity through the compact differential representation.
Data Source
AI summary
Methods, systems, and devices for channel state estimating and reporting schemes in wireless communication are described. In one aspect, a wireless communication method is provided to include transmitting, by a communication device, a channel state report message that includes at least one of a first field indicative of a value of a parameter or a second field that includes a deviation or a change rate of the parameter.