Terminal DCI Detection via Payload Size Segmentation
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Solution Overview
Problem
In the LTE and 5G communication systems, the complexity of blind detection for downlink control information (DCI) is increased due to the variety of DCI formats and payload sizes, leading to a high number of blind detections and increased computational complexity for terminals.
Innovation Solution
A method and system where a terminal obtains indication information for candidate DCI payload sizes, allowing it to perform blind detection on a physical downlink control channel (PDCCH) based on the indicated size, reducing the number of blind detections and complexity by aligning payload sizes and using predefined correspondence relationships between payload sizes and DCI formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal traverses all CCEs to perform blind detection on PDCCH, then the terminal can detect all possible DCI formats, but the computational complexity and number of blind detections increase significantly
Solution Approach 1:
The patent segments the blind detection process by dividing DCI formats into two categories: first DCI formats with payload sizes matching a first size, and second DCI formats with payload sizes matching a second size. The terminal performs separate blind detections for each category, reducing the complexity compared to traversing all possible formats uniformly. This segmentation allows the terminal to handle different payload sizes in an organized manner, reducing unnecessary computational overhead.
Solution Approach 2:
The patent applies preliminary action by having the network device transmit indication information in advance that specifies which DCI formats are used for scheduling downlink data. The terminal uses this prior information to determine the payload size category before performing blind detection, thereby avoiding the need to check all possible DCI formats. This preliminary indication reduces the number of blind detections required while ensuring reliable detection of the actual DCI format.
2Adaptability or versatility
If the terminal performs blind detection on all DCI formats with different payload sizes, then all DCI formats can be detected, but the number of blind detections increases
Solution Approach 1:
The patent segments DCI formats based on payload size characteristics, grouping them into first DCI formats (matching first size) and second DCI formats (matching second size). This segmentation enables the terminal to perform targeted blind detections for each group rather than checking all formats, thereby maintaining adaptability to different DCI formats while significantly improving detection efficiency by reducing the total number of blind detections required.
Solution Approach 2:
The network device performs preliminary action by transmitting indication information that specifies which DCI formats are being used for downlink data scheduling. The terminal uses this advance information to narrow down the search space to only relevant DCI format categories, maintaining versatility in handling different formats while improving productivity by avoiding unnecessary blind detections on incompatible formats.
Data Source
AI summary
The present disclosure discloses a downlink control information detecting method, a downlink control information transmitting method, a terminal and a network device. The method includes: obtaining indication information for indicating a candidate downlink control information (DCI) payload size; according to the candidate DCI payload size indicated by the indication information, performing blind detection on a physical downlink control channel (PDCCH) and determining DCI transmitted in the PDCCH.