Multi-AP Joint Transmission Weight Updates for Higher Effective Rate
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Solution Overview
Problem
In joint transmission by multiple APs, the overhead of weight notification leads to a decrease in effective rate, particularly when the weight applied to each AP changes during subsequent joint transmissions, causing interference and reduced communication quality.
Innovation Solution
A wireless base station generates and notifies another wireless base station of weight update information, including capability information and target data, to efficiently update weights for joint transmission, reducing overhead and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight notification is performed in joint transmission by multiple APs, then beamforming coordination is achieved, but overhead increases and effective rate decreases
Solution Approach 1:
The system performs weight notification only when weight changes are detected, rather than notifying before every joint transmission. The sharing AP determines whether weight update is necessary based on changes in receiver terminals or channel conditions, and only notifies other APs when updates are required. This preliminary assessment action reduces unnecessary notification overhead while maintaining communication quality.
2Adaptability or versatility
If weight is updated frequently to adapt to receiver changes, then communication quality is maintained, but notification overhead increases
Solution Approach 1:
The system implements a feedback mechanism where the sharing AP monitors changes in receiver terminals and channel conditions, and only triggers weight notification when actual changes are detected. The other APs also provide feedback about their weight usage status. This feedback-driven approach ensures weight adaptation occurs only when necessary, reducing unnecessary notification overhead while maintaining adaptability to receiver changes.
3Measurement precision
If channel state information is fed back every time beamforming is performed, then latest weight accuracy is improved, but overhead increases and effective rate hardly improves
Solution Approach 1:
Instead of performing channel state information feedback and weight notification every time beamforming is performed, the system adopts a periodic approach where updates occur only when specific conditions are met (receiver terminal changes or channel condition changes). This periodic action maintains measurement precision when needed while significantly reducing overhead and improving effective rate.
Data Source
AI summary
The present technology improves an effective rate in a case where joint transmission is performed once in multi-APs that perform joint transmission, and then a weight is changed and joint transmission is performed again. A wireless base station includes a wireless control unit and a communication unit. The wireless control unit generates weight update information for updating a first weight to a second weight, the first weight being a weight used in joint transmission previously performed with another wireless base station, the second weight being a weight used for performing the joint transmission after the joint transmission using the first weight. The communication unit notifies the another wireless base station of the weight update information.