CSI Prediction Algorithm for Cross-Carrier Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies due to the need for channel state information reference signals (CSI-RS) on all component carriers, which increases overhead and reduces system efficiency.
Innovation Solution
A method and device for predicting channel state information on a component carrier without receiving CSI-RS by determining a mapping between time-frequency resources of different component carriers using a prediction algorithm, allowing CSI reports to be generated and sent based on measured CSI from one carrier to predict CSI on another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS is transmitted on all component carriers, then channel state information measurement accuracy is improved, but signaling overhead increases and system efficiency decreases
Solution Approach 1:
The patent divides component carriers into two groups: primary component carrier(s) where CSI-RS is transmitted, and secondary component carrier(s) where CSI-RS is not transmitted. This segmentation allows the system to obtain channel state information for all carriers while transmitting reference signals only on selected carriers, thereby reducing overhead while maintaining measurement capability.
Solution Approach 2:
The patent introduces a prediction algorithm as an intermediary mechanism that translates channel state information measured from the primary component carrier to estimate channel state information for secondary component carriers. This intermediary process enables indirect acquisition of CSI for carriers without direct CSI-RS transmission.
2Loss of information
If CSI-RS is transmitted on all component carriers, then channel state information availability is improved, but resource utilization decreases
Solution Approach 1:
The patent makes the primary component carrier serve multiple functions: it is used for both data transmission and as a reference for predicting channel state information of secondary component carriers. This multi-functionality reduces the need for separate CSI-RS transmissions on each carrier while maintaining comprehensive CSI availability.
Solution Approach 2:
The patent performs channel state information measurement on the primary component carrier in advance, and uses this pre-acquired information to predict CSI for secondary carriers. This preliminary action on the primary carrier enables subsequent carriers to avoid CSI-RS transmission while still obtaining necessary channel state information.
3Productivity
If the number of component carriers is increased to increase data rate, then throughput is improved, but CSI-RS overhead increases proportionally
Solution Approach 1:
The patent segments the set of component carriers into primary and secondary groups, where only primary carriers receive CSI-RS transmissions. This segmentation ensures that when the total number of component carriers increases to boost data rate, the CSI-RS overhead increases only with the number of primary carriers, not proportionally with all carriers.
Data Source
AI summary
Aspects of the disclosure relate to determining channel state information (CSI) on a component carrier. In an example operation, a device determines a mapping between first time-frequency resources corresponding to a first component carrier (CC) and second time-frequency resources corresponding to a second CC using a prediction algorithm. The device receives, from a base station, a channel state information reference signal (CSI-RS) on the first time-frequency resources corresponding to the first CC and measures first CSI on the first time-frequency resources corresponding to the first CC based on the received CSI-RS. The device further predicts second CSI on the second time-frequency resources corresponding to the second CC based on the measured first CSI using the prediction algorithm. The device then generates a CSI report based on the predicted second CSI and sends the CSI report to the base station.