Coordinated Multi-Cell Transmission via Dynamic Cooperating Sets
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Solution Overview
Problem
In LTE-A systems, the complexity of coordinated multi-cell transmission is high due to the need for dynamic management of channel and user data sharing across cells, leading to inefficiencies in inter-cell interference reduction and throughput enhancement.
Innovation Solution
A method where a central controller determines candidate cooperating sets and broadcasts this information to User Equipments (UEs), allowing UEs to select their cooperating sets based on channel conditions, which are then fed back for central controller scheduling, thereby reducing complexity and improving coordination gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all cells in the super-cell participate in coordinated transmission simultaneously, then inter-cell interference is reduced and system throughput is improved, but the complexity of coordinated operation increases due to the need to share large amounts of channel and user data information
Solution Approach 1:
The patent segments the super-cell into multiple cooperating sets, where each set contains a subset of cells that participate in coordinated transmission together. This segmentation reduces the complexity of information sharing and coordination while maintaining the interference reduction benefits through selective participation of cell groups.
2Device complexity
If the cooperating set is defined in advance in the super-cell, then the coordinated operation complexity is reduced, but the flexibility is lost and high coordinated gain cannot be obtained due to different channel conditions of users
Solution Approach 1:
The patent implements dynamic determination of cooperating sets based on real-time channel conditions and user requirements. The central controller dynamically adjusts the composition of cooperating sets according to varying channel states, ensuring optimal coordination performance while maintaining manageable complexity through structured dynamic adaptation.
Solution Approach 2:
The system employs feedback mechanisms where channel condition information is continuously reported to the central controller, which then uses this feedback to dynamically adjust the cooperating set configurations. This feedback-driven approach enables the system to adapt to changing conditions while maintaining controlled complexity through centralized decision-making.
3Productivity
If different users select different cooperating sets according to their channel conditions, then the coordinated transmission performance is improved, but the number of cooperating sets increases resulting in high scheduling complexity
Solution Approach 1:
The patent introduces a central controller as an intermediary that manages and coordinates the selection of cooperating sets for different users. This central controller receives channel condition information from users, determines appropriate cooperating sets, and schedules transmissions, thereby reducing the scheduling complexity that would otherwise arise from distributed user selections while maintaining performance optimization.
Data Source
AI summary
Embodiments of the present invention disclose a method for coordinated multi-cell transmission, a central controller and a User Equipment (UE). In one embodiment, the method includes: determining, by a central controller, at least one candidate cooperating set in a super-cell, wherein each cell in the super-cell belongs to at least one candidate cooperating set, and broadcasting information of the at least one candidate cooperating set determined to all UEs in the super-cell; selecting, by each UE, a candidate cooperating set from the at least one candidate cooperating set as a cooperating set of the UE, and feeding back information of the cooperating set selected to the central controller; and determining, by the central controller, all cooperating sets in the super-cell and UEs participating in cooperation in each cooperating set according to the information of the selected cooperating set fed back by each UE.