PDCCH Aggregation-Level Mapping for Lower DCI Blind Detection
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Solution Overview
Problem
The complexity of blind detection on multiple pieces of downlink control information (DCI) is high due to the limited capability of terminal devices to monitor physical downlink control channel (PDCCH) candidates, leading to inefficient communication and resource utilization.
Innovation Solution
A correspondence is established between aggregation levels (AL) sets associated with different PDCCH candidates, allowing the terminal device to monitor only specific ALs corresponding to DCI, reducing the number of blind detection times and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs blind detection on all possible PDCCH candidate locations for multiple pieces of DCI, then the DCI can be reliably received, but the complexity of blind detection becomes relatively high
Solution Approach 1:
The patent segments the blind detection process by dividing PDCCH candidates into different sets (first PDCCH candidate set and second PDCCH candidate set) with different aggregation level configurations. The terminal device performs blind detection on a reduced number of candidates in the first set, and only on specific candidates in the second set based on correspondence relationships, rather than exhaustively searching all possible candidates. This segmentation reduces blind detection complexity while maintaining reliable DCI reception.
2Reliability
If the terminal device monitors multiple pieces of DCI separately, then all DCI can be detected, but the quantity of blind detection times increases
Solution Approach 1:
The patent merges the monitoring of multiple DCI pieces by establishing correspondence relationships between aggregation levels of different DCI messages. The terminal device uses the detection result of DCI in the first set to determine which DCI in the second set needs to be monitored, combining multiple separate detection tasks into a coordinated process. This merging approach reduces the total quantity of blind detection times while ensuring complete DCI detection.
3Reliability
If the terminal device performs blind detection on all PDCCH candidates with all aggregation levels, then no DCI is missed, but communication resource utilization deteriorates
Solution Approach 1:
The patent introduces dynamic adaptation in the blind detection process by establishing correspondence relationships between aggregation levels that can be configured based on channel conditions and traffic requirements. The terminal device dynamically determines which PDCCH candidates to monitor in the second set based on the detection results and correspondence relationships, rather than statically monitoring all candidates. This dynamic approach improves communication resource utilization while maintaining DCI detection accuracy.
Data Source
AI summary
This application provides an information transmission method and a communications apparatus. The method includes: determining a correspondence between a first aggregation level (AL) set associated with a plurality of first physical downlink control channel (PDCCH) candidates and a second AL set associated with a plurality of second PDCCH candidates; and monitoring at least one of the plurality of first PDCCH candidates and/or at least one of the plurality of second PDCCH candidates based on the correspondence.