Terminal Device DCI Detection Across Multiple Search Spaces
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Solution Overview
Problem
In New Radio (NR) systems, the independent detection of downlink control information (DCI) in different search spaces by terminal devices affects the reliability of physical downlink control channel (PDCCH) transmission, as they cannot determine which search spaces transmit the same DCI, leading to missed combined gain opportunities.
Innovation Solution
The method involves determining and detecting DCI in multiple search spaces with shared parameters such as monitoring periodicity, time slot offset, and aggregation level, allowing for combined detection or transmission of the same DCI across different search spaces, thereby improving transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device detects DCI independently in each configured search space, then the detection process is simple and follows the configuration, but the reliability of PDCCH transmission is reduced due to missed combined gain opportunities
Solution Approach 1:
The patent merges the detection results from multiple search spaces by combining the received signals (e.g., through soft combining) before making a final detection decision. This allows the terminal to exploit the diversity gain from multiple search spaces transmitting the same DCI, thereby improving reliability while managing complexity through a structured combining approach.
Solution Approach 2:
The patent introduces preliminary action by having the terminal device identify and group search spaces that transmit the same DCI before performing the actual detection and combining. This preliminary classification enables the device to organize the detection process efficiently, reducing the complexity of handling multiple search spaces while preparing for reliable signal combining.
2Reliability
If the network device transmits the same DCI in different search spaces, then the coverage and reliability are improved, but the terminal device cannot determine which search spaces transmit the same DCI, leading to inefficient detection
Solution Approach 1:
The patent employs feedback mechanisms where the network device provides indication information to the terminal device about which search spaces transmit the same DCI. This feedback enables the terminal to correctly identify and group related search spaces, preventing information loss about DCI correlations and enabling efficient combined detection while maintaining the reliability benefits of multi-search-space transmission.
3Productivity
If the terminal device detects DCI independently in each search space without combining, then the detection process is straightforward, but the spectral efficiency is reduced due to missed combined gain opportunities
Solution Approach 1:
The patent merges the detection processes by combining the received signals from multiple search spaces before detection. This merging approach improves spectral efficiency by utilizing the combined signal energy and diversity gain, while the structured combining method manages the increased detection difficulty through systematic signal processing procedures.
Data Source
AI summary
Embodiments of the present disclosure provide a wireless communication method, a terminal device and a network device. The method includes determining, by the terminal device, a plurality of search spaces for transmitting same DCI; and detecting, by the terminal device, the DCI in the plurality of search spaces.