Coordinator Handover in Wireless Personal Area Networks
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Solution Overview
Problem
In wireless personal area networks (WPANs), the hand-over process between coordinators is not efficiently managed, as existing methods do not prioritize stations based on their capabilities, leading to suboptimal role transfers.
Innovation Solution
A method and apparatus for performing hand-over in a personal basic service set (PBSS) that determines priority for coordinator role transfer based on stations' capabilities, including power source, channel time allocation, and network clustering functions, ensuring the role is handed over to a more capable station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hand-over is performed without prioritizing stations based on capabilities, then the hand-over process is simple, but network performance deteriorates due to suboptimal role transfers
Solution Approach 1:
The patent applies preliminary action by having stations pre-register their capabilities (power source type, channel time allocation function, network clustering function) with the coordinator before hand-over is needed. This capability information is stored and used when hand-over occurs, allowing the system to make informed decisions without complex real-time assessments during the hand-over process itself.
Solution Approach 2:
The patent changes the parameter of hand-over selection from arbitrary or round-robin to capability-based prioritization. By introducing capability parameters (continuous power supply capability, channel time allocation function, network clustering function) as selection criteria, the system transforms the hand-over process into a parameter-driven decision-making process that optimizes network performance.
2Stability of the object's composition
If coordinator role is transferred to any station, then role transfer is flexible, but network stability deteriorates due to transferring to inappropriate stations
Solution Approach 1:
The patent applies local quality by assigning different weights to different capability parameters based on network conditions and requirements. For example, continuous power supply capability may be given higher priority in stable network conditions, while other capabilities may be prioritized in different scenarios. This allows the system to maintain stability by selecting coordinators with appropriate local qualities for specific network contexts.
3Reliability
If capability information is collected from all stations, then coordinator selection is optimized, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential capability parameters needed for coordinator selection (power source type, channel time allocation function, network clustering function) from the full station profile. By taking out only these specific capability indicators rather than collecting all possible station information, the system reduces communication overhead while maintaining sufficient data for optimized coordinator selection.
Data Source
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AI summary
A method of performing hand-over in a personal basic service set (PBSS) including a plurality of stations and one coordinator is provided. An association request frame comprising PCP capability information, and requesting to associate to the PBSS, is received from each of the stations. The PCP capability information comprises information regarding at least one of whether each of the stations supports a power source capability of continuous power supply, whether each of the stations supports a channel time allocation function, and whether each of the stations supports a network clustering function. An association response frame, indicating whether the association request received from each of the stations is approved, is transmitted to each of the stations, and a priority to be a coordinator of the stations is determined based on the PCP capability information. Hand-over is performed with one of the stations according to the determined priority.