DCI Size Alignment Using RBG Allocation for URLLC Control
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Solution Overview
Problem
There is a need for a new Downlink Control Information (DCI) format in New Radio (NR) that is well-suited for Ultra-Reliable Low-Latency Communication (URLLC) services, requiring a smaller DCI size for robust transmission and efficient resource utilization, while maintaining reliability.
Innovation Solution
The method involves adjusting the frequency-domain resource allocation in the new DCI format by scaling or configuring Resource Block Group (RBG) sizes to align its size with existing DCI formats 0-0 and 1-0, using RBG parameters to adjust the granularity of the frequency-domain resource allocation, and potentially adding or removing fields to achieve size alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new DCI format is designed with smaller size for URLLC services, then transmission reliability and resource utilization are improved, but the complexity of DCI format management and decoding complexity increase due to multiple DCI format sizes
Solution Approach 1:
The patent changes the size parameter of the new DCI format by adjusting the frequency-domain resource allocation field to use RBG (Resource Block Group) based allocation instead of PRB (Physical Resource Block) based allocation. This parameter change reduces the number of bits required for resource allocation, thereby reducing the overall DCI size while maintaining the ability to specify resource allocations accurately for URLLC services
2Manufacturing precision
If the frequency-domain resource allocation uses fine granularity (PRB-based), then resource allocation precision is improved, but the number of bits required increases leading to larger DCI size
Solution Approach 1:
The patent segments the frequency-domain resources into groups called RBG (Resource Block Group), where each RBG consists of multiple contiguous PRBs. Instead of allocating resources at the individual PRB level, the system allocates at the RBG level. This segmentation reduces the number of bits required for resource allocation while maintaining sufficient precision for URLLC resource allocation needs
Solution Approach 2:
The patent transitions from one-dimensional PRB-based allocation to a two-dimensional approach by introducing RBG as an intermediate layer. The frequency domain is first divided into RBGs, and then resource allocation specifies which RBGs are allocated. This dimensional change allows for more efficient bit representation while preserving allocation precision
Data Source
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AI summary
Embodiments of a method of operation of a wireless device for providing Downlink Control Information (DCI) format size alignment between a first DCI format a second DCI format and corresponding embodiments of a wireless device are disclosed herein. In some embodiments, the method of operation of the wireless device comprises determining one or more Resource Block Group (RBG) parameters for interpreting a frequency-domain resource allocation for the first DCI format. The RBG parameter(s) are either a RBG scaling factor(s) or a RBG size(s). The RBG parameter(s) adjust a granularity of the frequency-domain resource allocation for the first DCI format such that a size of the first DCI format is aligned with a size of the second DCI format. The method further comprises receiving DCI having the first DCI format and interpreting the frequency-domain resource allocation of the DCI in accordance with the one or more RBG parameters.