Downlink Control Information Homogeneity for UE Power Reduction
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Solution Overview
Problem
In wireless communications systems, existing methods for downlink control information (DCI) transmission across different bandwidth resources lead to increased power consumption in user equipment (UE) due to repeated detection of DCI across multiple bandwidth resources during cross-bandwidth-resource scheduling.
Innovation Solution
The method involves sending DCI with a consistent size (L1_1 or L1_2) on either the first or second bandwidth resource, where the DCI includes resource allocation information that adapts in length based on the number of bandwidth resources, using RRC signaling to indicate resource allocations, and employing bitmaps or resource indicator values to efficiently allocate and configure resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI is transmitted on multiple bandwidth resources with different sizes, then resource allocation flexibility is improved, but UE power consumption increases due to repeated detection
Solution Approach 1:
The patent applies homogeneity by ensuring that DCI messages transmitted on different bandwidth resources have the same size. This is achieved by padding shorter DCI messages with dummy bits to match the size of DCI messages on other bandwidth resources. By making DCI messages homogeneous in size across different bandwidth resources, the UE can efficiently detect and process DCI without needing to perform separate size checks for each bandwidth resource, thereby reducing power consumption while maintaining resource allocation flexibility
2Manufacturing precision
If DCI size varies across different bandwidth resources, then resource allocation precision is improved, but device complexity increases
Solution Approach 1:
The patent applies homogeneity by standardizing DCI message sizes across different bandwidth resources. Instead of allowing DCI sizes to vary according to the specific bandwidth resource, the system pads all DCI messages to a uniform size. This eliminates the need for complex size-matching logic in both the network device and UE, reducing processing complexity while still allowing flexible resource allocation through the content of the DCI messages rather than their size
3Adaptability or versatility
If DCI detection is performed on multiple bandwidth resources, then scheduling coverage is improved, but detection time increases
Solution Approach 1:
The patent applies homogeneity by making DCI messages on different bandwidth resources identical in size and structure. This allows the UE to use the same detection parameters and processing logic for all bandwidth resources, enabling more efficient parallel or sequential detection. The uniform structure reduces the time required for each detection attempt and allows the UE to quickly move between bandwidth resources, improving overall scheduling coverage without proportionally increasing detection time
4Loss of information
If resource allocation information length varies, then information efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The patent applies homogeneity by standardizing the length of resource allocation information within DCI messages across different bandwidth resources. Instead of varying the information length to match the specific resource allocation needs, the system uses a fixed-length format with padding where necessary. This eliminates the need for precise measurement and matching of information lengths, reducing the precision requirements for DCI processing while maintaining efficient resource allocation through the standardized format
Data Source
AI summary
This application provides a downlink control information transmission method, an apparatus, and a system. The method includes: sending, by a gNB, downlink control information (DCI) to UE on a first bandwidth resource, where the DCI is used for data transmission between the gNB and the UE on the first bandwidth resource or data transmission between the gNB and the UE on a second bandwidth resource; and if the DCI is used for data transmission between the gNB and the UE on the first bandwidth resource, a size of the DCI is L1_1, or if the DCI is used for data transmission between the gNB and the UE on the second bandwidth resource, a size of the DCI is L1_2, where L1_1 is equal to L1_2, and L1_1 and L1_2 are integers greater than or equal to 1.