Terminal Precoder Reporting via Partial Segmentation
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Solution Overview
Problem
Conventional communication schemes face difficulties in specifying and applying a preferred precoder due to limitations in reporting precoding matrix information, which hinders transmission efficiency.
Innovation Solution
The proposed solution involves a terminal device that calculates and reports multiple partial precoder information elements to a base station, allowing for efficient specification and application of precoder information, thereby improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single code book with one precoding matrix information is used, then the device complexity is reduced, but the transmission efficiency deteriorates
Solution Approach 1:
The code book is divided into multiple segments (first code book and second code book), each containing different precoding matrix information. The terminal device selects precoding matrix information from different code book segments based on channel conditions, enabling more flexible and efficient precoder specification while maintaining manageable system complexity through modular organization.
2Productivity
If multiple partial precoder information elements are reported, then the precoder specification efficiency is improved, but the information reporting overhead increases
Solution Approach 1:
Precoder information is segmented into multiple partial elements (first PMI and second PMI) that can be reported separately. This segmentation allows the terminal to provide detailed precoder preferences without overwhelming the reporting channel, as each partial element can be optimized for specific reporting requirements and can be combined at the base station to reconstruct the complete precoder specification.
Solution Approach 2:
Instead of reporting complete precoding matrix information in a single element, the system uses multiple partial precoder information elements that collectively provide the necessary precision. This partial action approach reduces the burden on any single reporting instance while achieving the same or better precision through aggregation of multiple smaller information elements.
Data Source
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AI summary
A terminal device communicating with a base station device includes: switching means for switching between a first feedback mode in which one precoder information specifying a preferred precoder and a reception quality indicator specifying a preferred transmission rate are reported periodically to the base station device and a second feedback mode in which first partial precoder information among first and second partial precoder information specifying the preferred precoder and a set of the second partial precoder information and the reception quality indicator are reported periodically to the base station device; and report means using, in the second feedback mode, a periodic resource for reporting the precoder information and reception quality indicator in the first feedback mode, for reporting one of the first partial precoder information and the set of the second partial precoder information and the reception quality indicator alternately and in a period two times a report period of the precoder information and reception quality indicator in the first feedback mode.