Compact DCI Signaling for Low-Latency URLLC 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 tailored tables for URLLC operations, allowing for efficient scheduling and transmission optimization, including cross-carrier scheduling and dynamic repetition configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DCI formats are used for URLLC, then comprehensive control information can be provided, but payload size increases and latency increases
Solution Approach 1:
The patent extracts only the essential control information fields needed for URLLC operations from the complete DCI format. By taking out non-critical fields and retaining only crucial elements (such as resource allocation, modulation and coding scheme, and hybrid automatic repeat request information), the DCI payload size is reduced while maintaining sufficient control functionality for reliable URLLC communication.
Solution Approach 2:
The patent changes the parameter structure of DCI by introducing a compact format with modified field configurations. This includes using fewer bits for certain parameters, implementing dynamic field inclusion based on operational needs, and optimizing the overall DCI structure to achieve smaller payload size while preserving the essential control functions required for URLLC reliability.
2Reliability
If traditional DCI formats are used for URLLC, then complete control signaling can be provided, but payload size increases
Solution Approach 1:
The patent extracts only the essential control information fields needed for URLLC operations from the complete DCI format. By taking out non-critical fields and retaining only crucial elements (such as resource allocation, modulation and coding scheme, and hybrid automatic repeat request information), the DCI payload size is reduced while maintaining sufficient control functionality for reliable URLLC communication.
Solution Approach 2:
The patent implements partial action by including only the necessary subset of control information fields for URLLC rather than transmitting the complete DCI format. This partial inclusion of fields reduces the payload size while providing adequate control signaling for URLLC operations, applying the principle of doing just enough rather than everything.
3Loss of time
If compact DCI format is used, then payload size is reduced and latency is reduced, but control information completeness may be compromised
Solution Approach 1:
The patent changes the parameter structure of DCI by introducing a compact format with modified field configurations. This includes using fewer bits for certain parameters, implementing dynamic field inclusion based on operational needs, and optimizing the overall DCI structure to achieve smaller payload size while preserving the essential control functions required for URLLC reliability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring certain parameters and control information through higher-layer signaling (such as RRC configuration) before actual data transmission. This allows the compact DCI format to omit some information that has already been established, reducing payload size and latency while maintaining control information completeness through the combination of pre-configured and dynamically signaled parameters.
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.