Multi-Cell DCI Search Space Allocation With Lower Control Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing network resource allocation for multi-cell scheduling, particularly in deriving user-specific search spaces and counting candidates for multi-cell DCI formats, leading to increased control overhead.
Innovation Solution
The implementation of a multi-cell scheduling downlink control information (MC-DCI) mechanism that includes configuring user-specific search spaces and determining resource allocation across multiple cells, using carrier indicator fields and search space identifiers to optimize DCI size and blind decode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If single-cell scheduling is used per DCI, then control overhead is reduced, but the ability to simultaneously schedule multiple cells is limited
Solution Approach 1:
The patent combines multiple cell scheduling capabilities into a single DCI message by merging the scheduling functions. The MC-DCI format integrates carrier indicator fields, search space identifiers, and resource allocation information for multiple cells, allowing simultaneous scheduling of multiple component carriers through one control message rather than requiring separate DCI messages for each cell.
2Productivity
If multi-cell scheduling with single DCI is implemented, then resource utilization efficiency is improved, but deriving user-specific search spaces and counting candidates becomes complex
Solution Approach 1:
The patent segments the search space configuration into cell-specific components. Each scheduled cell has its own search space identifier (SSB-SS) that can be independently derived using cell-specific parameters such as the physical cell identity and carrier indicator field. This segmentation allows the UE to separately determine search spaces for each cell while maintaining overall multi-cell scheduling efficiency.
Solution Approach 2:
The patent performs preliminary configuration of search space parameters through higher-layer signaling before actual scheduling occurs. The network pre-configures SSB-SS, carrier indicator fields, and other search space-related parameters, allowing the UE to efficiently derive search spaces without complex real-time calculations during scheduling operations.
3Device complexity
If carrier indicator fields are used for multi-cell scheduling, then DCI size optimization is achieved, but the number of blind decode operations increases
Solution Approach 1:
The patent applies local quality by making the carrier indicator field optional rather than mandatory in all cases. The CIF is included in the DCI message only when actually needed for distinguishing between multiple scheduled cells. When a single cell is scheduled or when the search space configuration makes CIF unnecessary, the field can be omitted, thereby reducing the DCI size and the number of blind decode operations required.
Data Source
AI summary
The present disclosure describes methods, system, and devices for resource determination mechanism with a multi-cell scheduling downlink control information (MC-DCI). One method includes receiving a configuration including a value for a first set of cells, a first user-specific search space (USS) of a multi-cell scheduling downlink control information (MC-DCI) on a scheduling cell, a second USS on a scheduled cell associated with the first USS; and determining resource of the first and second USS on the scheduling cell.