Data Rate Control in Soft Handoff via Combined Base Station Commands
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Solution Overview
Problem
In wireless communication systems, especially during handoffs, there is a need to optimize data rate control to prevent resource wastage and interference, as different base stations may support varying data rates, leading to suboptimal mobile station data rates and potential system performance degradation due to lack of effective coordination between base stations.
Innovation Solution
The method involves receiving and decoding mobile station transmissions by multiple base stations, with successful base stations sending acknowledgement messages to adjust the mobile station's data rate based on combined rate control commands, which can include weighting factors to prioritize primary base stations and manage congestion, ensuring optimal data rate adjustments during handoffs and cell switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple base stations independently control data rates during handoff, then each base station can optimize for its own congestion level, but the mobile station receives conflicting rate control commands leading to suboptimal overall performance
Solution Approach 1:
The patent combines rate control commands from multiple base stations into a unified control mechanism. The mobile station aggregates rate control indicators from all active base stations and applies a combining rule (such as logical OR) to determine the final data rate, ensuring that all base stations coordinate their rate control rather than operating independently, thus resolving the conflict between independence and optimization
2Productivity
If the mobile station uses the highest data rate supported by any base station, then data throughput is maximized, but interference with other users increases and system capacity is reduced
Solution Approach 1:
The patent implements feedback-based rate control where the mobile station continuously monitors rate control commands from multiple base stations and adjusts its transmission rate accordingly. The base stations provide feedback through rate control indicators that reflect their current congestion levels, allowing the mobile station to dynamically adjust the data rate to balance throughput with interference management
3Reliability
If the mobile station increases transmit power to maintain coverage during handoff, then communication reliability is improved, but the cell coverage range is reduced due to increased interference
Solution Approach 1:
The patent changes the data rate parameter dynamically during handoff based on the combined rate control commands from multiple base stations. By adjusting the data rate according to real-time feedback from base stations about their congestion levels and the mobile station's position, the system optimizes the trade-off between maintaining communication reliability and preserving cell coverage range
Data Source
AI summary
A method and apparatus for controlling a data rate of a transmission in a wireless communication system during handoff. Controlling the data rate includes receiving transmissions from a plurality of base stations, wherein at least one of the received transmissions includes an acknowledgement message. Then determining a rate control command included within transmissions of the base station that includes the acknowledgement message and using the command to control the data rate. Controlling the data rate also includes receiving transmissions from a plurality of base stations. Then determining a plurality of rate control commands included within the received transmissions from the plurality of base stations. The rate control commands are then combined and used to control the data rate.