Compact URLLC DCI Signaling for Low-Latency Reliable Scheduling
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Solution Overview
Problem
Current wireless communication technologies, such as 5G NR, face challenges in efficiently managing downlink control information (DCI) for ultra-reliable low-latency communications (URLLC), requiring improved reliability and reduced latency, which existing DCI formats struggle to achieve due to increased payload size and complexity.
Innovation Solution
A compact DCI format is introduced, utilizing a carrier indicator field (CIF) and rate-matching indicator field, with reduced bit usage and separate CIF tables for URLLC and eMBB, allowing for compressed signaling that enhances reliability and flexibility in scheduling transmissions across component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DCI formats are used for URLLC scheduling, then comprehensive control information can be provided, but payload size increases and latency requirements cannot be met
Solution Approach 1:
The patent extracts only the essential control information fields needed for URLLC scheduling, removing unnecessary fields from traditional DCI formats. This creates a compact DCI format that reduces payload size and transmission time while maintaining the critical functions needed for reliable URLLC communication.
Solution Approach 2:
The patent applies different DCI format configurations for different service types (URLLC vs. eMBB). The compact DCI format is specifically optimized for URLLC requirements with tailored field selections and bit allocations, while traditional formats remain for other services. This localized optimization ensures URLLC gets the precise control signaling it needs without compromising other services.
2Adaptability or versatility
If comprehensive DCI fields are included for flexible scheduling, then scheduling versatility is improved, but DCI payload size and complexity increase
Solution Approach 1:
The patent segments the DCI format into essential and optional fields. The compact format includes only the mandatory fields needed for basic URLLC scheduling, while maintaining the ability to add optional fields when specific functionality is required. This segmentation allows the system to maintain low complexity for common cases while preserving versatility when needed.
Solution Approach 2:
The compact DCI format is designed to handle multiple URLLC scheduling scenarios using a unified set of fields. Rather than creating separate formats for different cases, the patent uses a universal compact format that can accommodate various scheduling requirements through flexible field interpretations and configurations.
3Measurement precision
If separate CIF tables are used for URLLC and eMBB, then scheduling precision is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements dynamic CIF table selection where the appropriate CIF table (URLLC or eMBB) is chosen based on the service type of the scheduled transmission. This dynamic approach allows the system to use the compact URLLC CIF table when scheduling URLLC traffic, reducing overhead, while using the comprehensive eMBB CIF table when needed for enhanced mobile broadband services.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for compact downlink control information (DCI) signaling design for ultra-reliable low-latency communications (URLLC). A method for wireless communications performed by a base station (BS) is provided. The method generally includes generating DCI, the DCI scheduling at least one transmission, according to a first DCI format. The first DCI format is compressed relative to a second DCI format and includes a carrier indicator field (CIF) and/or a rate-matching indicator field. The BS transmits the DCI to a user equipment (UE). The UE communicates with the BS based on the received DCI.