Multi-Cell DCI Size Alignment for Lower Blind Detection Complexity
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Solution Overview
Problem
The fragmentation of frequency resources in 5G NR technology leads to inconsistent sizes of multi-cell downlink control information (MC-DCI) across different scheduled cells, causing complexity in blind detection and deteriorating PDCCH transmission performance.
Innovation Solution
A method for determining a target size of MC-DCI by deducing the alignment performed by the base station, allowing terminals to receive and parse MC-DCI based on this aligned size, thereby ensuring consistent MC-DCI sizes across cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MC-DCI is used to schedule data of multiple cells, then the frequency spectrum utilization is improved, but the size inconsistency of DCI across cells increases detection complexity
Solution Approach 1:
The patent applies homogeneity by aligning the sizes of MC-DCI across different scheduled cells. The base station performs size alignment so that MC-DCI messages scheduling multiple cells have consistent sizes, enabling the terminal to use a unified detection method for all cells, thereby reducing detection complexity while maintaining improved frequency spectrum utilization through multi-cell scheduling
2Device complexity
If MC-DCI size alignment is performed across multiple cells, then blind detection complexity is reduced, but the PDCCH transmission performance deteriorates
Solution Approach 1:
The patent applies local quality by performing size alignment only for the control portion of MC-DCI while allowing the data portion to remain cell-specific. This selective alignment reduces blind detection complexity for the control information without compromising the transmission performance of the actual data payloads, thus resolving the contradiction between detection simplicity and transmission reliability
Data Source
AI summary
A downlink control information (DCI) receiving method is performed by a terminal and includes: determining multiple cells scheduled by multi-cell downlink control information (MC-DCI); determining a target size of the MC-DCI for the multiple cells; and receiving and parsing the MC-DCI in a scheduling cell based on the target size of the MC-DCI.