Handoff Decision Using Mean RSS and Fast Power Control
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Solution Overview
Problem
Conventional hard handoff methods in wireless communication systems suffer from a 'ping-pong phenomenon' and deteriorated call quality due to sudden changes in Received Signal Strength (RSS) thresholds, leading to inefficient handoffs.
Innovation Solution
Implementing a method that uses downlink fast power control and calculates the mean of Received Signal Strengths (RSSs) to determine when to perform a handoff, thereby stabilizing channel quality and reducing unnecessary handoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hard handoff is performed based on RSS threshold comparison, then handoff decision is simple and fast, but ping-pong phenomenon occurs and call quality deteriorates
Solution Approach 1:
The system performs preliminary actions by continuously monitoring RSS values and pre-calculating mean RSS before handoff decisions are critical. The mean RSS calculation is performed in advance based on multiple measured RSS values, creating a more stable baseline for handoff decisions and reducing the likelihood of premature or incorrect handoff triggers.
Solution Approach 2:
The patent introduces mean RSS calculation as an intermediary between raw RSS measurements and handoff decisions. Instead of directly comparing instantaneous RSS values to thresholds, the system uses the mean of multiple RSS measurements as an intermediate value, which filters out transient fluctuations and provides a more reliable basis for handoff determination.
2Device complexity
If RSS threshold is used for handoff decision, then the method is simple to implement, but unnecessary handoffs occur due to signal fluctuations
Solution Approach 1:
The system performs preliminary actions by continuously monitoring RSS values and pre-calculating mean RSS before handoff decisions are critical. The mean RSS calculation is performed in advance based on multiple measured RSS values, creating a more stable baseline for handoff decisions and reducing the likelihood of premature or incorrect handoff triggers.
Solution Approach 2:
The patent introduces mean RSS calculation as an intermediary between raw RSS measurements and handoff decisions. Instead of directly comparing instantaneous RSS values to thresholds, the system uses the mean of multiple RSS measurements as an intermediate value, which filters out transient fluctuations and provides a more reliable basis for handoff determination.
3Reliability
If downlink fast power control is applied, then channel quality is stabilized, but additional control mechanisms increase system complexity
Solution Approach 1:
The system implements dynamic downlink fast power control that adjusts transmission power in real-time based on current channel conditions. The power control mechanism dynamically modifies the downlink power level when RSS falls below the threshold, creating a stabilizing effect that maintains channel quality without requiring complete handoff execution.
Solution Approach 2:
The patent changes the power parameter of the downlink signal dynamically based on RSS conditions. When the mean RSS falls below the threshold, the system adjusts the downlink power level as a compensating parameter change, allowing the serving base station to maintain adequate signal strength and avoid unnecessary handoffs.
Data Source
AI summary
Provided are an apparatus and a method for performing a handoff in a wireless communication system. The method includes executing a downlink fast power control when a Received Signal Strength (RSS) of a serving Base Station (BS) is less than a threshold; calculating a mean of RSSs subject to the downlink fast power control, and comparing the calculated mean with the threshold; and performing the handoff to a neighbor BS when the mean of the RSSs is less than the threshold.