Terminal Control for Multi-Cell Scheduling With Single DCI
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Solution Overview
Problem
Existing methods do not support scheduling of multiple cells using single control information in radio communication systems, particularly in dynamic spectrum sharing scenarios.
Innovation Solution
A terminal equipped with a receiving unit and a control unit that can identify and schedule a single or multiple carriers based on first and second information received from a base station, allowing for cross-carrier scheduling using a single DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cells are scheduled individually using separate DCI, then scheduling control precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent merges multiple DCI messages into a single DCI that schedules multiple cells simultaneously. The single DCI includes a carrier indicator field (CIF) that identifies multiple target carriers, allowing the terminal to schedule resources across multiple cells with one control message rather than separate DCI for each cell, thus reducing processing complexity while maintaining scheduling precision
Solution Approach 2:
The DCI structure is enhanced to perform multiple functions: it not only schedules a single cell but can simultaneously schedule multiple cells by including multiple carrier indicator field values. This multi-functional DCI design allows one control message to serve multiple scheduling purposes, reducing the number of control messages needed
2Loss of information
If single DCI is used to schedule multiple cells, then signaling overhead is reduced, but scheduling flexibility and precision deteriorate
Solution Approach 1:
The patent segments the carrier indication into multiple independent carrier indicator field values within the single DCI. Each carrier indicator field value corresponds to a specific target carrier, allowing the system to selectively schedule different combinations of cells. This segmentation maintains scheduling flexibility while consolidating control information into a single DCI message
Solution Approach 2:
The DCI structure is designed to be dynamic in terms of the number of carrier indicator field values it can contain. The single DCI can adaptively include one or multiple carrier indicator field values depending on the scheduling requirements, providing flexibility in scheduling different numbers of cells with a single control message
3Productivity
If cross-carrier scheduling is enhanced for dynamic spectrum sharing, then frequency utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent combines cross-carrier scheduling functionality with multi-cell scheduling in a unified DCI structure. By merging these functions, the system achieves enhanced frequency utilization through dynamic spectrum sharing while avoiding the complexity of separate control mechanisms for cross-carrier and multi-cell scheduling
Solution Approach 2:
The enhanced DCI structure serves as a universal control mechanism that handles both cross-carrier scheduling and multi-cell scheduling requirements. This multi-functional design eliminates the need for separate control protocols, reducing system complexity while maintaining the frequency utilization benefits of dynamic spectrum sharing
Data Source
AI summary
A terminal includes: a receiving unit of receiving first information for configuring scheduling and second information for executing scheduling from a base station; and a control unit that identifies a single scheduled carrier or a plurality of scheduled carriers, based on the first information and the single second information.