Frequency-Domain Resource Assignment to Reduce Multi-Carrier DCI Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the New Radio (NR) system, scheduling multiple carriers with a single piece of downlink control information (DCI) results in a large frequency domain resource assignment field overhead, leading to an excessively large DCI size.
Innovation Solution
A method for frequency domain resource assignment that involves joint coding and limiting candidates for multiple carriers, cells, or bandwidth parts, reducing the overhead by using methods such as joint coding of start and length, or start and end positions, and limiting frequency domain scheduling to reduce the assignment overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one piece of DCI is used to schedule multiple carriers, cells, or bandwidth parts, then the PDCCH overhead is reduced, but the frequency domain resource assignment field size becomes excessively large
Solution Approach 1:
The frequency domain resource assignment field is segmented into multiple parts, each corresponding to different carriers, cells, or bandwidth parts. Instead of using a single large field to indicate all frequency resources, the field is divided into smaller sub-fields or resource indication values (RIVs) that can be independently decoded for each scheduled entity, thereby reducing the overall field size while maintaining multi-carrier scheduling capability
Solution Approach 2:
The patent introduces a new dimension for resource indication by using resource indication values (RIVs) that encode both start position and length information in a compact form. This dimensional transformation allows the frequency domain resources to be indicated more efficiently, reducing the field size from what would be required for explicit resource block indexing to a compressed RIV representation
2Measurement precision
If separate frequency domain resource assignment fields are used for each carrier, cell, or bandwidth part, then resource assignment precision is maintained, but the DCI size becomes too large
Solution Approach 1:
Multiple frequency domain resource assignment fields for different carriers, cells, or bandwidth parts are merged into a single unified frequency domain resource assignment field. This unified field uses a common resource indication mechanism (such as RIV encoding) that can represent frequency resources across multiple entities, thereby maintaining precise resource assignment while significantly reducing the total field size compared to using separate fields for each entity
Solution Approach 2:
The frequency domain resource assignment field is designed to serve multiple functions simultaneously - it can indicate frequency resources for one or more carriers, cells, or bandwidth parts within the same field structure. This multi-functional design allows the field to adapt to different scheduling scenarios (single-carrier or multi-carrier) without requiring separate fields, thus maintaining precision while reducing DCI size
Data Source
AI summary
A frequency domain resource assignment method includes: receiving downlink control information for scheduling a plurality of carriers, cells, or bandwidth parts; and determining, based on a frequency domain resource assignment field in the downlink control information, frequency domain resources of the terminal on at least part of the plurality of carriers, cells, or bandwidth parts.