Cell State Control via Group Segmentation in Dual Connectivity
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Solution Overview
Problem
In heterogeneous networks, the inconsistency in cell state management between base station apparatuses leads to inefficient scheduling and reduced throughput due to difficulties in grasping the states of cells managed by other base station apparatuses during dual connectivity, especially with delayed backbone lines.
Innovation Solution
A technique that divides cells into groups based on control information from the base station apparatus, allowing for efficient activation or deactivation of cell states using bit information, thereby improving state control efficiency and reducing inconsistencies between base station apparatuses and terminal apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed packet scheduling is performed between base station apparatuses in dual connectivity, then scheduling flexibility and responsiveness are improved, but inconsistency in cell state management occurs between base station apparatuses
Solution Approach 1:
The patent segments cell groups and assigns specific cells to different base station apparatuses, allowing each base station to independently manage its assigned cells while maintaining overall system coordination. This segmentation enables distributed packet scheduling to improve responsiveness while preventing state inconsistency through clear demarcation of management responsibilities.
Solution Approach 2:
The patent implements feedback mechanisms where terminal apparatuses report cell state information to base station apparatuses, and base station apparatuses exchange scheduling information. This feedback loop ensures that distributed base station apparatuses maintain consistent understanding of cell states, resolving the reliability issue while preserving scheduling flexibility.
2Reliability
If centralized packet scheduling control is performed by one base station apparatus, then cell state consistency is maintained, but scheduling responsiveness to wireless conditions deteriorates due to backbone line delay
Solution Approach 1:
The patent divides cell management responsibilities among multiple base station apparatuses through cell group segmentation. Each base station apparatus can independently make scheduling decisions for its assigned cells, eliminating the bottleneck caused by centralized control and backbone line delays, while maintaining consistency through coordinated management.
Solution Approach 2:
The patent introduces the terminal apparatus as an intermediary that receives scheduling information from multiple base station apparatuses and provides feedback. This intermediary role enables distributed base station apparatuses to coordinate their actions without requiring direct high-speed communication between them, thus improving responsiveness while maintaining consistency.
3Adaptability or versatility
If base station apparatuses manage different cells independently in distributed scheduling, then scheduling flexibility is improved, but it becomes difficult to grasp states of cells managed by other base station apparatuses
Solution Approach 1:
The patent creates a universal cell state management framework where each base station apparatus, while managing its specific cells independently, operates within a standardized system that allows all apparatuses to understand and coordinate regarding all cell states. This multi-functionality enables flexible independent management while preventing information loss through standardized state representation.
Solution Approach 2:
The patent implements feedback channels where base station apparatuses share cell state information with each other and with terminal apparatuses. This feedback mechanism ensures that while each base station maintains scheduling flexibility for its assigned cells, all apparatuses remain informed about overall system state, preventing information loss.
Data Source
AI summary
Provided is a technique related to a terminal apparatus, a base station apparatus, a communication system, a control method, and an integrated circuit which realize procedure of efficiently controlling a state of a cell for a plurality of cells. The terminal apparatus using a plurality of cells divides the plurality of cells into groups based on group identification information transmitted from the base station apparatus, receives control information indicating a change of a cell state of at least one of the cells, and controls the state of the cell based on bit map information and the group identification information, which are included in the control information and indicate the cell the state of which is to be changed.