RoF Base Station Grouping by Propagation Delay
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Solution Overview
Problem
In IEEE802.11ay standard RoF communication systems, varying propagation delay times between centralized station apparatuses and access points lead to unequal opportunities for radio communications by wireless terminals, as beamforming training is affected by the number of selectable time slots, resulting in reduced success rates.
Innovation Solution
The centralized station apparatus groups access points with similar propagation delay times within a threshold value, allowing them to perform connection processing in synchronized groups, ensuring equal opportunities for wireless terminals to complete beamforming training and establish communication connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If access points are connected via optical fibers with different lengths, then the system can support more flexible station placement and larger coverage area, but the propagation delay times vary causing unequal opportunities for wireless terminals in beamforming training
Solution Approach 1:
The patent segments the beamforming training process into multiple opportunities within the A-BFT period. Wireless terminals are given multiple time slots to attempt connection, compensating for propagation delay variations. This segmentation allows terminals connected via longer optical fibers (with higher propagation delay) to still succeed in beamforming training by utilizing additional time slot opportunities.
Solution Approach 2:
The patent performs preliminary allocation of multiple beamforming training opportunities to wireless terminals before the actual training process begins. The centralized station apparatus pre-calculates and assigns multiple A-BFT period opportunities to each terminal based on expected propagation delay characteristics, ensuring that terminals with longer fiber connections have sufficient chances to complete training successfully.
2Productivity
If the A-BFT period is kept short to maintain system efficiency, then productivity is improved, but terminals with longer propagation delay times cannot complete beamforming training
Solution Approach 1:
The patent implements periodic action by providing multiple beamforming training opportunities at regular intervals within the A-BFT period. Instead of a single continuous training window, the system creates multiple discrete time slots periodically distributed throughout the A-BFT period, allowing terminals with different propagation delays to find suitable training opportunities without extending the overall period excessively.
Solution Approach 2:
The patent introduces dynamics by making the beamforming training opportunity allocation adaptive to propagation delay conditions. The centralized station apparatus dynamically adjusts the number and distribution of training opportunities based on the specific propagation delay characteristics of each wireless terminal, optimizing the balance between system efficiency and connection success rate.
Data Source
AI summary
A base station apparatus includes a centralized station apparatus and a plurality of access points connected to the centralized station apparatus via optical fibers. Based on propagation delay times in the optical fibers, the centralized station apparatus performs grouping such that access points, among a plurality of access points, with a difference in propagation delay time within a threshold value, belong to the same group. The plurality of access points perform connection processing for each of the groups, to communicate with wireless terminals subordinate to the plurality of access points.