DCI Detection Grouping for 5G Terminal Blind Search
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Solution Overview
Problem
In current 5G communications, terminal devices face high complexity in blind detection of downlink control information (DCI) due to the lack of knowledge about the current transmission mode and the quantity of DCI pieces, leading to the need for blind detection across all possible search spaces.
Innovation Solution
The proposed solution involves generating a configuration parameter that groups candidate resources such that each group carries only one piece of DCI. This configuration parameter is sent to the terminal device, allowing it to stop blind detection once a DCI is detected within each group of candidate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs blind detection on all possible search spaces to ensure correct detection of DCI, then the reliability of DCI detection is improved, but the complexity of blind detection is greatly increased
Solution Approach 1:
The patent segments the search space into multiple groups, where each group corresponds to a specific transmission mode (multipoint or single-station). The terminal device is configured with multiple search space groups, and it performs blind detection only on the group corresponding to the current transmission mode. This segmentation resolves the contradiction by maintaining detection reliability through proper grouping while reducing complexity by limiting the detection scope to one group at a time.
2Reliability
If the terminal device performs blind detection on all candidate resources regardless of transmission mode, then all DCI can be correctly detected, but the detection time is increased
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple search space groups corresponding to different transmission modes before the terminal device performs blind detection. The network side configures the search space groups and indicates the current active group to the terminal device. This allows the terminal device to directly start detection on the correct group without searching through all possible search spaces, thus maintaining detection completeness while significantly reducing detection time.
Data Source
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AI summary
This application provides a DCI detection method, a PDCCH configuration method, and a communications apparatus. The method includes: generating and sending, by a network side device, a configuration parameter, where the configuration parameter is used to configure at least one group of candidate resources, and each group of candidate resources carries one piece of DCI; and when one piece of DCI is blindly detected from each group of candidate resources, stopping, by the terminal device, the blind detection on the group of candidate resources. In embodiments of this application, the candidate resources are grouped by using the configuration parameter, and each group of candidate resources carries only one piece of DCI. Therefore, once the terminal device blindly detects the DCI on each group of candidate resources, the terminal device may stop the blind detection on the group of candidate resources, thereby avoiding blind detection on remaining resources, reducing complexity of the blind detection, and improving network performance.