CSI-RS Validity Determination via Paging Parameters
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Solution Overview
Problem
In wireless communication systems, determining the effectiveness of channel state information-reference signals (CSI-RS) within a downlink subframe is challenging, particularly when different cells transmit paging messages at varying intervals, affecting data demodulation efficiency.
Innovation Solution
A method is introduced where a first parameter, specific to a cell, is used to determine the validity of CSI-RS by identifying subframes where the CSI-RS is not valid, allowing for accurate demodulation of downlink data by distinguishing it from a second parameter used by another cell, which indicates the number of subframes for paging messages during a reference time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different cells use different parameters for paging message transmission intervals, then communication flexibility and adaptability are improved, but determining CSI-RS validity becomes more complex and error-prone
Solution Approach 1:
The patent introduces a first parameter as an intermediary indicator that indirectly represents CSI-RS validity information. Instead of directly signaling complex validity patterns, the first parameter serves as a mediator that allows the UE to determine CSI-RS validity based on paging message transmission intervals, simplifying the determination process while maintaining adaptability across different cells
Solution Approach 2:
The patent inverts the traditional approach by using paging message transmission interval information (originally intended for paging purposes) to convey CSI-RS validity information. Instead of adding dedicated signaling for CSI-RS validity, the system repurposes existing paging parameter signaling to carry dual functionality, thereby reducing overall signaling overhead and complexity
2Measurement precision
If CSI-RS validity is not accurately determined, then demodulation accuracy deteriorates, but implementing complex validity checking mechanisms increases processing complexity
Solution Approach 1:
The patent performs preliminary determination of CSI-RS validity by checking whether the current subframe satisfies the paging message transmission condition indicated by the first parameter before attempting demodulation. This preliminary check ensures that demodulation is only performed when CSI-RS is valid, maintaining high demodulation accuracy without requiring complex real-time validity verification mechanisms during the demodulation process itself
Data Source
AI summary
A method of receiving downlink data in a wireless communication system according to an embodiment of the present invention includes: receiving a first parameter, for determining the effectiveness of a channel state information-reference signal (CSI-RS) from a special cell, from a first cell; and obtaining information on a sub frame having non-effective CSI-RS by using the number of sub frames to which the paging message of a second cell is transmitted for a reference time, and the first parameter may be different from a second parameter that is transmitted by the second cell and indicates the number of sub frames to which the paging message of the second cell is transmitted for the reference time.