UE Channel State Feedback Adaptation for 5G Spectrum Efficiency
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Solution Overview
Problem
In 5G systems, existing methods for uplink control information (UCI) feedback in wireless communication systems, particularly for URLLC services, face challenges in efficiently utilizing various reference signals and adapting to changing channel conditions, leading to suboptimal spectrum efficiency and incorrect reception of channel state information.
Innovation Solution
A method where a User Equipment (UE) receives a reference signal in a time-frequency resource set and transmits information indicating the type of channel state information, allowing adaptive feedback of CQI and PMI based on channel measurements, and utilizing other reference signals to improve spectrum efficiency by reducing the density of CSI-RS configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE feeds back detailed channel state information (CQI and PMI) for every reference signal measurement, then the channel state information accuracy is improved, but the uplink control overhead increases
Solution Approach 1:
The patent changes the parameter of feedback content by dynamically selecting between full CSI feedback (CQI+PMI) and reduced feedback (CQI only) based on the reference signal type. For non-CSI-RS reference signals, only CQI is fed back, while for CSI-RS, both CQI and PMI are fed back, thus adapting the feedback parameter set to the specific measurement context
Solution Approach 2:
The patent introduces dynamic adaptation of feedback behavior based on the reference signal type. The UE dynamically determines whether to feed back PMI or only CQI by evaluating the reference signal type (CSI-RS vs. non-CSI-RS), making the feedback mechanism flexible and context-dependent rather than static
2Adaptability or versatility
If the UE uses multiple types of reference signals for channel measurement, then the adaptability to different channel conditions is improved, but the complexity of determining feedback content increases
Solution Approach 1:
The patent enables the UE to autonomously determine the appropriate feedback content based on the reference signal type it receives. The UE self-services by automatically identifying whether the reference signal is CSI-RS or non-CSI-RS and independently deciding the feedback composition without requiring complex external coordination or configuration
3Measurement precision
If the density of CSI-RS configuration is increased to improve channel state information quality, then the measurement precision is improved, but the spectrum efficiency deteriorates
Solution Approach 1:
The patent makes non-CSI-RS reference signals (such as DMRS and PTRS) multi-functional by using them not only for their primary purposes (demodulation and phase tracking) but also for channel state information measurement and feedback. This universal utilization of reference signals reduces the need for dedicated CSI-RS resources
Solution Approach 2:
The patent effectively creates a copy of CSI-RS functionality by enabling other reference signal types to serve as alternative sources for channel measurement and CSI feedback, reducing the reliance on and density of actual CSI-RS configurations
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE receives a first reference signal in a first time-frequency resource set, and transmits first information and second information; the first information indicates the first time-frequency resource set from Q candidate time-frequency resource sets; at least two of the Q candidate time-frequency resource sets correspond to a first type and a second type respectively; a channel measurement for the first reference signal is used for determining the second information; and a type of channel state information included in the second information is related to a type corresponding to the first time-frequency resource set. A relationship is established between the type corresponding to the first time-frequency resource set and the content of the second information, thus improving the feedback precision and efficiency of channel state information.