Private Access Point Hand-off via Pathloss Measurement
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Solution Overview
Problem
Current wireless network hand-off methods face challenges in accurately identifying and transferring connections between macro access points and private access points, particularly when multiple private access points share similar PN offset values, leading to inefficiencies in hand-off operations.
Innovation Solution
A method that determines pathloss values between private access points and access terminals, using received power measurements and transmit power calculations to identify the most likely private access point for hand-off, and involves a private access point server to coordinate the hand-off process by requesting and analyzing pathloss values from multiple private access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional hand-off methods using PN offset values are used to identify private access points, then the hand-off process is simple, but accuracy deteriorates when multiple private access points share similar PN offset values
Solution Approach 1:
The patent changes the identification parameter from PN offset values to pathloss values. By calculating pathloss between the macro access point and each private access point based on received power measurements, the system achieves more accurate identification of the target private access point, even when multiple private access points share similar PN offset values.
Solution Approach 2:
The patent introduces a private access point server as an intermediary that coordinates the hand-off process. This server collects pathloss values from multiple private access points, determines which private access point is most likely the target based on these values, and facilitates the hand-off decision, thereby improving identification accuracy without significantly increasing overall system complexity.
2Reliability
If pathloss values are calculated and compared from multiple private access points to identify the target, then identification accuracy improves, but the hand-off process complexity increases
Solution Approach 1:
The private access point server acts as a central coordinator that manages the complexity of calculating and comparing pathloss values from multiple private access points. It collects pathloss information, determines the most likely target private access point, and coordinates the hand-off process, thereby improving reliability while containing complexity at the server level rather than distributing it across all access points.
Solution Approach 2:
The system performs preliminary pathloss calculations and comparisons before the actual hand-off execution. By determining the most likely target private access point in advance based on pathloss values, the system ensures more reliable hand-off operations while organizing the complex calculations in a structured, advance manner that reduces real-time complexity.
3Measurement precision
If received power measurements are taken at multiple private access points to determine pathloss, then hand-off accuracy improves, but the time required for hand-off increases
Solution Approach 1:
The system performs received power measurements and pathloss calculations as preliminary actions before the actual hand-off execution. By gathering and analyzing pathloss values from multiple private access points in advance, the system identifies the most likely target with high precision while organizing measurements efficiently to minimize the time impact on the final hand-off execution.
Solution Approach 2:
The private access point server coordinates the timing and collection of received power measurements from multiple private access points. It aggregates this data and performs pathloss calculations centrally, thereby achieving precise identification without requiring simultaneous measurements at all access points, which helps reduce the overall time required for the hand-off process.
Data Source
AI summary
This description relates to access terminal hand-off methods in wireless networks.