Uplink Control Signal Reference Mapping for Channel Estimation
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Solution Overview
Problem
There is a need to improve the performance of signal processing based on reference signals, specifically the Demodulation Reference Signal (DMRS), in the context of NR Coverage Enhancement to enhance signal reception and data demodulation accuracy.
Innovation Solution
A terminal and radio communication method that includes a reception section for receiving control information and a control section for controlling the transmission of an uplink control signal with a reference signal mapped over multiple transmission time units, enabling joint channel estimation across multiple slots to improve channel estimation accuracy and data demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal is mapped within a single transmission time unit, then transmission time is reduced, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent combines reference signals from multiple transmission time units (slots) into a single uplink control signal by mapping the reference signal across these multiple time units. This merging allows the receiver to perform joint channel estimation across the combined signals, improving channel estimation accuracy while maintaining efficient transmission timing.
2Measurement precision
If reference signal is mapped over multiple transmission time units, then channel estimation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The uplink control signal is designed to serve multiple functions simultaneously: it carries both data information and reference signal information for channel estimation. By mapping the reference signal within the same uplink control signal structure rather than as a separate entity, the patent reduces the number of separate processing chains needed, thereby managing complexity while achieving improved channel estimation.
3Measurement precision
If reference signal is mapped over multiple transmission time units, then data demodulation accuracy is improved, but transmission resource overhead increases
Solution Approach 1:
The patent merges the reference signal with the uplink control signal, allowing the same transmission resources to carry both data and reference information. By mapping the reference signal across multiple transmission time units within the control signal structure, the system achieves better demodulation accuracy without requiring separate dedicated reference signal resources, thus controlling resource overhead.
Data Source
AI summary
A terminal according to the present invention comprises: a reception unit that receives control information; and a control unit that controls the transmission of an uplink control signal including a reference signal allocated across multiple transmission time units on the basis of the control information.