Mobile Station Beam Selection Threshold Management
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Solution Overview
Problem
Switching beams in mobile stations can disrupt communications and is undesirable, particularly when the mobile station would need to transmit at a high power level to maintain balance between forward and reverse links.
Innovation Solution
The mobile station computes the necessary transmit power to balance forward and reverse link path losses and switches beams only if this power exceeds a predefined threshold, otherwise staying with the current beam regardless of its receive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mobile station switches to a beam with higher receive power, then the receive signal strength is improved, but communication stability deteriorates due to beam switching disruptions
Solution Approach 1:
The system changes the beam selection criterion from purely receive power-based to a composite criterion that includes both receive power and required transmit power. This parameter change resolves the contradiction by considering both signal strength improvement and communication stability through the threshold comparison mechanism.
Solution Approach 2:
The system uses feedback from the base station regarding required transmit power levels to inform beam selection decisions. This feedback loop allows the mobile station to adjust beam selection based on both receive quality and power consumption considerations, preventing unnecessary beam switches that would disrupt communication.
2Reliability
If the mobile station stays with the current beam, then communication stability is maintained, but receive signal strength may be suboptimal
Solution Approach 1:
The system modifies the beam selection parameters by introducing a threshold-based decision criterion that combines receive power and required transmit power. This allows the system to maintain stability when appropriate while still enabling improvements when beneficial.
Solution Approach 2:
The system performs preliminary evaluation of both receive power and required transmit power before making beam selection decisions. This preliminary assessment prevents premature beam switching and ensures that stability is maintained unless both criteria indicate improvement is warranted.
3Reliability
If the mobile station transmits at high power to balance forward and reverse links, then link balance is improved, but energy consumption increases
Solution Approach 1:
The system changes the operational parameters by introducing a threshold on required transmit power. When the calculated required power exceeds this threshold, the system selects an alternative beam even if it has slightly lower receive power, thereby avoiding excessive energy consumption while maintaining acceptable link balance.
Solution Approach 2:
The threshold value acts as an intermediary parameter that mediates between link balance requirements and energy consumption constraints. By comparing required transmit power against this threshold, the system finds a compromise solution that satisfies both objectives without requiring extreme power levels.
Data Source
AI summary
A method and apparatus for managing beam selection in a mobile station. The mobile station determines that, using a currently selected beam, the mobile station would have to transmit at too high of a power level in order to maintain a balance between a forward link path and a reverse link path. The mobile station computes a transmit power on the currently selected beam and compares the computed transmit power to a predefined threshold value. If the computed transmit power exceeds the predefined threshold value, the mobile station may switch to another beam. Otherwise, the mobile station will stay with the current beam, regardless of whether the current beam has the highest receive power.