Compact Downlink Control Information for URLLC Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DCI designs are inefficient for ultra-reliable and low-latency communications (URLLC) due to their large size, which affects reliability and increases blocking probability, and are not suitable for high-latency sensitive transmissions, requiring a compact DCI design to meet stringent reliability requirements.
Innovation Solution
The proposed solution involves determining a compact DCI format with reduced FD-RA bits by adjusting the granularity of the start and length of resource allocation, allowing for improved reliability and reduced blocking probability through careful design of bit-fields in the resource allocation field, enabling efficient resource block assignment in the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal DCI format is used for URLLC transmissions, then comprehensive control information can be conveyed, but DCI size becomes large which reduces reliability and increases blocking probability
Solution Approach 1:
The patent extracts only the essential control information fields needed for URLLC transmissions, removing unnecessary fields from the normal DCI format. This creates a compact DCI format that contains only the critical parameters for ultra-reliable low-latency communications, thereby reducing overall DCI size while maintaining necessary control functionality.
Solution Approach 2:
The patent applies different DCI format designs for different service types. Instead of using a single universal DCI format, it creates specialized compact DCI formats optimized specifically for URLLC transmissions, allowing the control information structure to be locally adapted to the specific requirements of latency-sensitive applications.
2Reliability
If aggregation level is increased to maintain reliability with normal DCI size, then control reliability may be maintained, but blocking probability increases
Solution Approach 1:
By extracting and removing redundant control information fields from the normal DCI format, the patent reduces the overall DCI size. This size reduction allows URLLC transmissions to achieve the same reliability without requiring higher aggregation levels, thereby maintaining lower blocking probability while still meeting strict reliability requirements.
3Reliability
If compact DCI design is implemented to reduce DCI size, then reliability improves and blocking probability decreases, but resource allocation flexibility may be reduced
Solution Approach 1:
The patent implements dynamic resource allocation mechanisms within the compact DCI format, allowing the system to adapt resource allocation based on current transmission conditions and requirements. This dynamic approach maintains flexibility despite the reduced DCI size by enabling real-time adjustments to resource block assignments and transmission parameters.
Solution Approach 2:
The patent changes key parameters of the DCI format specifically for URLLC services, such as reducing the number of resource allocation bits and modifying field structures. These parameter changes are tailored to the specific needs of ultra-reliable transmissions, maintaining sufficient flexibility for resource allocation while optimizing for the stricter reliability and latency requirements of URLLC.
Data Source
AI summary
Various solutions for frequency domain-resource allocation (FD-RA) for compact downlink control information (DCI) design and operations with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine at least one of a first step size corresponding to a start of a FD-RA, a second step size corresponding to a length of the FD-RA, and a number of FD-RA bits. The apparatus may determine resources blocks (RBs) according to at least one of the first step size, the second step size, and the number of FD-RA bits. The apparatus may perform a downlink or uplink transmission according to the RBs.