Coordinated Transmission via Beam Division Multiple Access
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Solution Overview
Problem
In a beam division multiple access environment, interference at cell boundaries in MIMO wireless communication systems is not effectively mitigated by conventional base station coordination methods, particularly when using antennas with pattern/polarization characteristics, leading to unstable service delivery.
Innovation Solution
A coordinated transmission method that divides the service target region into beam sectors using antenna arrays with pattern/polarization characteristics, performing macro diversity, coordinated silence, or coordinated beamforming operations based on interference levels, with specific requests and operations coordinated between the serving base station and peripheral base stations to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional base station coordination methods are used in beam division multiple access environment, then device complexity is reduced, but interference mitigation capability deteriorates
Solution Approach 1:
The service target region is divided into multiple beam sectors using antenna arrays with pattern/polarization characteristics. This segmentation allows coordinated transmission to be performed on a per-beam-sector basis, enabling precise interference mitigation at cell boundaries while maintaining manageable system complexity through localized coordination.
Solution Approach 2:
Different coordination operations (macro diversity, coordinated silence, coordinated beamforming) are selectively applied to different beam sectors based on local interference conditions. This local quality approach ensures that each beam sector receives the most appropriate coordination treatment, maximizing interference mitigation effectiveness while avoiding unnecessary complexity in low-interference areas.
2Area of stationary object
If antennas with pattern/polarization characteristics are used, then space utilization improves, but coordination method applicability deteriorates
Solution Approach 1:
The coordination mechanism is designed to work with antenna arrays utilizing pattern/polarization characteristics by incorporating beam sector division as a universal preprocessing step. The same coordination operations (macro diversity, coordinated silence, coordinated beamforming) can be applied across different beam sectors formed by pattern/polarization antennas, making the coordination method universally applicable to this antenna type while leveraging their space-efficient properties.
Solution Approach 2:
The patent introduces beam sector division as an additional spatial dimension for coordination. By dividing the service region into beam sectors based on antenna pattern/polarization characteristics, the system adds a directional dimension to traditional coordination methods, enabling them to effectively handle interference in space-efficient antenna configurations.
3Reliability
If coordinated transmission operations are performed based on interference levels, then service stability improves, but processing complexity increases
Solution Approach 1:
The coordination operation selection is made dynamic based on real-time interference level measurements. The base station determines whether to perform macro diversity, coordinated silence, or coordinated beamforming operations by comparing measured interference levels against threshold values. This dynamic adaptation ensures service stability under varying interference conditions while keeping processing complexity manageable through simple threshold-based decision logic.
Solution Approach 2:
The system implements feedback-based coordination where interference levels are continuously measured and used to select appropriate coordination operations. The base station receives feedback about interference conditions from user terminals and adjusts coordination strategies accordingly, ensuring stable service delivery while maintaining reasonable processing complexity through feedback-driven adaptive control.
Data Source
AI summary
A coordinated transmission method based on beam division multiple access and an apparatus performing the same are disclosed. The coordinated transmission method in a beam division multiple access environment, which divides a service target region into a plurality of beam sectors through a plurality of antenna arrays having at least one of a pattern characteristic and a polarization characteristic, includes receiving a coordination request from a user terminal located in the service target region and performing any one among a macro diversity operation, a coordinated silence operation, and a coordinated beamforming operation for the user terminal based on an interference level included in the coordination request.