NR DCI Size Matching for Manageable Blind Decoding
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Solution Overview
Problem
The limited DCI size budget in 5G NR systems constrains the number of different DCI sizes a UE can monitor, requiring precise alignment of DCI formats to maintain manageable blind decoding procedures and ensure consistent understanding between the UE and the network.
Innovation Solution
A set of systematic DCI size matching procedures, including rules for determining DCI sizes based on bandwidth parts and search space configurations, ensure accurate alignment of DCI sizes within the specified budget, allowing for consistent decoding and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI sizes are supported to accommodate different scheduling scenarios, then the system flexibility and adaptability are improved, but the complexity of blind decoding procedures increases and the number of DCI sizes to monitor becomes unmanageable
Solution Approach 1:
The patent applies universality by enabling a single DCI size (first DCI size) to serve multiple scheduling scenarios that would traditionally require different DCI sizes. The gNodeB transmits the first DCI size with a first indication information that can indicate either first or second time resources, allowing one DCI format to perform the function of multiple formats. This reduces the number of DCI sizes the UE must monitor while maintaining system flexibility.
Solution Approach 2:
The patent merges multiple DCI sizes into a single DCI size by combining the scheduling information for different time resources into one DCI structure. The first DCI size incorporates indication information that can point to either first or second time resources, effectively merging what would have been separate DCI formats into a unified structure that reduces blind decoding complexity.
2Device complexity
If the number of different DCI sizes to be monitored is reduced, then the blind decoding complexity is reduced, but the ability to support multiple scheduling scenarios is limited
Solution Approach 1:
The patent applies dynamics by making the DCI size selection adaptive based on the actual scheduling scenario. The gNodeB dynamically chooses whether to use the first DCI size with first indication information or the second DCI size with second indication information, and the UE dynamically determines which size to monitor based on the indicated time resources. This dynamic adaptation allows the system to support multiple scenarios while keeping the monitored DCI sizes manageable.
Solution Approach 2:
The patent segments the scheduling scenarios into distinct categories (first scheduling scenario with first time resources, second scheduling scenario with second time resources) and assigns different DCI sizes to each segment. This segmentation allows the UE to monitor a limited number of DCI sizes while the gNodeB uses the appropriate segmented DCI size for each specific scheduling scenario, maintaining both simplicity and versatility.
3Reliability
If consistent DCI size matching procedures are implemented, then the understanding of DCI contents between UE and network is improved, but the flexibility in DCI configuration is reduced
Solution Approach 1:
The patent applies parameter changes by establishing clear rules for determining which DCI size to use based on parameter comparisons (comparing time resource characteristics to determine first or second DCI size). This systematic parameter-based approach ensures consistent DCI size matching between UE and network, improving reliability while the gNodeB retains flexibility in choosing which parameter comparison to apply based on the specific scheduling scenario.
Data Source
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AI summary
Systematic size matching procedures for downlink control information, DCI, provide exact instructions on how DCI size matching is to be performed in a NR wireless system, to meet predetermined limits for how many different DCI sizes may be monitored by a user equipment, UE. With these procedures, consistent and exact DCI size matching can be performed while keeping blind decoding procedures manageable, ensuring common understanding of DCI contents between the UE and the network.