Joint DCI Field for Multi-CC Scheduling Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in managing downlink control information (DCI) for multi-component carrier (CC) scheduling, particularly in carrier aggregation configurations, where transmitting separate DCIs for each component carrier increases signaling overhead and reduces spectral efficiency.
Innovation Solution
The system transmits a joint field in the DCI that includes rate matching (RM) and zero power channel state information reference signal (ZP-CSI-RS) indications for multiple CCs, allowing for common or per-CC RMR configurations, and using a set identifier for shared ZP-CSI-RS resources, enabling efficient communication across multiple CCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate DCIs are transmitted for each component carrier in carrier aggregation configuration, then each CC can be individually scheduled and controlled, but signaling overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent combines multiple separate DCI messages into a single joint DCI that schedules multiple component carriers simultaneously. This merging approach reduces the total number of DCI transmissions while maintaining the ability to individually configure each CC through separate fields within the joint DCI structure, thereby reducing signaling overhead without sacrificing scheduling flexibility
Solution Approach 2:
The joint DCI structure is designed to serve multiple component carriers with a single message, making it a universal scheduling mechanism. The DCI includes multiple fields that can independently configure different CCs, allowing one DCI to perform the function of multiple separate DCIs, thus improving spectral efficiency while maintaining adaptability
2Ease of operation
If separate DCIs are transmitted for each component carrier, then detailed control information can be provided for each CC, but spectral efficiency is reduced due to increased overhead
Solution Approach 1:
Multiple detailed control fields for different CCs are merged into a single joint DCI message. Each field within the joint DCI maintains the detailed control information needed for its specific CC, but all fields are transmitted together in one message, reducing the total transmission overhead and improving spectral efficiency while preserving operational detail
3Quantity of substance
If a joint field is used in DCI for multiple CCs, then signaling overhead is reduced and spectral efficiency is enhanced, but the DCI structure becomes more complex
Solution Approach 1:
The joint DCI structure is segmented into distinct fields, each corresponding to a specific component carrier. This segmentation allows the complex joint DCI to be organized into manageable, independently interpretable units, making it easier for the UE to parse and process the information while still achieving reduced overhead compared to separate DCIs
Solution Approach 2:
Different fields within the joint DCI are designed with local quality appropriate for each specific CC's requirements. Each field can have different formats, sizes, and configurations tailored to the specific needs of its associated CC, allowing the overall structure to handle complexity locally while maintaining a unified joint message format
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit downlink control information (DCI) to a user equipment (UE) indicating a joint field for at least a first component carrier (CC) and a second CC of a carrier aggregation configuration. For example, the joint field may include a rate matching (RM) indication for the first CC and the second CC, a zero power channel state information reference signal (ZP-CSI-RS) indication for the first CC and the second CC, or both. In some cases, the RM indication may include a common RM resource (RMR) configuration applicable for both the first CC and the second CC or per-CC RMR configurations that indicate separate RMRs for each of the CCs. Additionally, the ZP-CSI-RS indication may include a set identifier that indicates a resource set for ZP-CSI-RS resources for both the first CC and the second CC.