Downlink Channel Distance Reporting for Massive MIMO Estimation
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Solution Overview
Problem
In massive MIMO systems, efficiently reporting channel estimation of downlink channels is challenging, leading to waste in radio resources, computation overhead, and storage overhead.
Innovation Solution
A method where a receiving apparatus reports information about the distance between the downlink channel and a reference channel, decoupling pairing and precoder matrix computation, and transmitting this information at specific time offsets to reduce signaling and computational overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation reporting methods are used in massive MIMO systems, then complete channel information can be obtained, but radio resource waste, computation overhead, and storage overhead increase significantly
Solution Approach 1:
The patent extracts only the essential channel information (distance between DL channel and reference channel) rather than reporting complete channel estimation data. This selective extraction reduces the amount of data that needs to be transmitted and processed while maintaining sufficient accuracy for precoder computation, thereby reducing radio resource waste without completely sacrificing measurement precision.
Solution Approach 2:
The channel information is segmented into a reference channel component and a distance metric component. By separating the channel representation into these two parts, the system can leverage the reference channel (which can be obtained in advance) and only report the incremental distance information, reducing overall reporting overhead while maintaining channel estimation accuracy.
2Measurement precision
If complete channel estimation information is reported, then accurate channel knowledge is available at the transmitter, but computation overhead and storage overhead increase
Solution Approach 1:
The reference channel information is obtained in advance by the transmitting apparatus before the actual channel estimation reporting occurs. This preliminary acquisition of reference information allows the system to compute channel estimates using only the incremental distance data from the UE, significantly reducing the computation overhead at the transmitter compared to processing complete channel estimation data.
Solution Approach 2:
The patent extracts only the essential channel information (distance between DL channel and reference channel) rather than reporting complete channel estimation data. This selective extraction reduces the amount of data that needs to be transmitted and processed while maintaining sufficient accuracy for precoder computation, thereby reducing radio resource waste without completely sacrificing measurement precision.
3Measurement precision
If channel information is reported frequently to maintain accuracy, then channel estimation remains up-to-date, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel information (distance between DL channel and reference channel) rather than reporting complete channel estimation data. This selective extraction reduces the amount of data that needs to be transmitted and processed while maintaining sufficient accuracy for precoder computation, thereby reducing radio resource waste without completely sacrificing measurement precision.
Data Source
AI summary
Embodiments of the present application provide a method and an apparatus for communications. A receiving apparatus receives first information that is for triggering a report of information of a downlink (DL) channel, and the receiving apparatus transmits the information of the DL channel based on the first information. The information of the DL channel indicates a distance between the DL channel and a reference channel.