Dynamic Sub-band Configuration for CSI Feedback Overhead
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Solution Overview
Problem
The fixed configuration of sub-band sizes in 5G NR technologies is inefficient in managing channel state information feedback overhead, particularly in fluctuating wireless propagation environments, necessitating dynamic configuration to effectively utilize sounding reference signals for reduced feedback overhead.
Innovation Solution
The method involves receiving configuration information via higher-layer signaling to dynamically configure Channel State Information—Reference Signals (CSI-RS) ports and sub-band sizes, utilizing sounding reference signals for delay pre-compensation and flexible sub-band reporting, allowing for improved channel state feedback efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed sub-band size configuration is used, then system complexity is reduced, but channel state information feedback overhead efficiency deteriorates in fluctuating wireless environments
Solution Approach 1:
The patent implements dynamic sub-band size configuration where the network can adjust the number of sub-bands and their sizes based on channel conditions. The UE receives dynamic indication of sub-band sizes via DCI or RRC signaling, allowing the system to adapt to fluctuating wireless propagation environments while maintaining manageable complexity through standardized procedures.
2Loss of information
If dynamic sub-band size configuration is implemented, then channel state information feedback overhead efficiency is improved, but system complexity increases
Solution Approach 1:
The patent changes the parameter of sub-band size from fixed to dynamically configurable. The network configures the number of sub-bands (Nsb) and their sizes (K0, K1, ..., K(Nsb-1)) based on channel conditions, allowing optimization of feedback overhead while managing complexity through controlled parameter adjustment via standardized signaling mechanisms.
3Measurement precision
If sounding reference signals are utilized for delay pre-compensation, then channel state reporting accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies delay pre-compensation using sounding reference signals before channel state estimation. The network performs delay estimation based on SRS measurements and pre-compensates the channel delays, allowing the UE to observe slow variations in the channel and improve measurement accuracy while concentrating processing at the network side.
Data Source
AI summary
A wireless communication method is disclosed for a user equipment (UE) in communication with a base station (BS) in a network (NW) that includes receiving from the BS, via higher-layer signaling or downlink control information (DCI), configuration information and configuring reception of one or more Channel State Information—Reference Signals (CSI-RSs) based on the configuration information, where the configuration information includes one or more new values to configurable CSI-RS ports in Type II port-selection codebook.