Downlink Control Information Size Alignment for 5G NR Blind Detection
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the alignment of downlink control information (DCI) sizes for group-common DCI formats is challenging due to the '3+1' DCI size budget constraint, leading to increased blind detection efforts and complexity for user equipment (UEs).
Innovation Solution
The proposed solution involves aligning the DCI sizes by adjusting the payload of group-common DCI formats using padding or truncation of bits in the frequency domain resource assignment field, ensuring that the total number of distinct DCI sizes monitored by UEs does not exceed the '3+1' budget, thereby maintaining efficient decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DCI size alignment is performed to meet the '3+1' budget constraint, then the number of distinct DCI sizes monitored by UEs is reduced, but the complexity of blind detection and decoding increases due to multiple decoding attempts required for different DCI sizes
Solution Approach 1:
The patent applies parameter changes by adjusting the payload size of group-common DCI formats through padding or truncation of bits in the frequency domain resource assignment field. This modifies the DCI size parameter to align different DCI formats (e.g., DCI format 2_0 and DCI format 2_1) to the same size, enabling UEs to monitor fewer distinct DCI sizes while maintaining the '3+1' budget constraint.
Solution Approach 2:
The patent implements partial action by selectively applying size alignment only to group-common DCI formats that exceed the budget constraint, rather than uniformly adjusting all DCI formats. The base station determines which DCI formats need alignment based on their individual sizes and applies padding or truncation only where necessary to meet the '3+1' limit.
2Adaptability or versatility
If multiple DCI sizes are monitored to accommodate different frequency regions, then the coverage and flexibility of the system is improved, but the blind detection overhead and decoding time increase
Solution Approach 1:
The patent applies universality by creating a unified DCI size that can serve multiple frequency regions. By aligning the sizes of DCI formats for different frequency regions (e.g., first and second frequency regions), the system enables a single DCI size to be used across multiple regions, reducing the need for separate decoding attempts for each region while maintaining flexible coverage.
3Reliability
If DCI size alignment is performed by padding or truncation, then the DCI size budget is complied with, but the information content or resource allocation precision may be affected
Solution Approach 1:
The patent applies local quality by making targeted modifications to specific fields within the DCI payload, particularly the frequency domain resource assignment field. The padding or truncation is applied locally to this field to adjust the overall DCI size without affecting other critical information fields, thereby maintaining information integrity while achieving size alignment for budget compliance.
Data Source
AI summary
Embodiments of the present disclosure relate to DCI size alignment. According to some embodiments of the disclosure, a method may include: receiving RRC signaling for configuring a first frequency region, wherein the first frequency region is within the frequency resource of each UE of a group of UEs including the UE; determining a size of a first DCI format according to the first frequency region; determining a size of a second DCI format according to a second frequency region; in response to the size of the first DCI format being inequal to that of the second DCI format, receiving the first DCI format within the first frequency region according to the size of the second DCI format; and receiving a first PDSCH within the first frequency region, wherein the first PDSCH is scheduled by the first DCI format.