Uplink Power Control for MRAB Voice Data Connections
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Solution Overview
Problem
In wireless communication systems, simultaneous voice and data connections (MRAB calls) often result in dropped calls due to limited transmit power being divided across multiple channels, leading to increased rates of connection drops.
Innovation Solution
A method is implemented in wireless terminals to detect a power limited mode, suspend transmission of uplink control channel data, and reassign power from the control channel to data channels during MRAB calls, thereby maintaining connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmit power is divided across multiple channels for simultaneous voice and data connections, then multiple RAB connections are supported, but connection reliability deteriorates due to power limitation
Solution Approach 1:
The patent implements dynamic power allocation that adjusts power distribution between voice and data channels based on channel conditions and traffic requirements. The system continuously monitors power availability and reassigns power dynamically, transitioning between different power allocation states to maintain connection reliability while supporting multiple RAB connections.
Solution Approach 2:
The system changes power allocation parameters adaptively, adjusting the power split between control channels and data channels based on detected power limitations. When power limitation is detected, the system modifies transmission parameters including power levels and channel prioritization to maintain reliable connections.
2Productivity
If transmit power is allocated to multiple channels simultaneously, then data transmission capability is improved, but power availability per channel deteriorates
Solution Approach 1:
The patent employs dynamic power allocation that continuously adjusts power distribution between voice and data channels based on real-time channel conditions and traffic requirements. This dynamic approach allows the system to optimize power usage, allocating more power to data channels when available while maintaining voice connection stability.
Solution Approach 2:
The system applies different power allocation strategies to different channels based on their specific requirements. Control channels receive guaranteed minimum power to maintain connection stability, while data channels receive variable power allocation optimized for their transmission needs, creating localized quality differences in power distribution.
Data Source
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AI summary
In some implementations of the present invention, improvement of connection quality and reduction of dropped connection rate are achieved by suspending the transmission of High Speed Dedicated Physical Control Channel (HS-DPCCH) data when a wireless terminal detects a power limiting mode during multi-radio access bearer (MRAB) connections and voice RAB is present, and correspondingly increasing uplink transmission power to voice and signaling data channels. In some implementations, the suspension of HS-DPCCH data can be complete or partial. When fully suspended, no data is sent on the HS-DPCCH. When partially suspended, no channel quality indicator (CQI) is transmitted. In both partial and full suspension schemes, the CQI transmission is suspended until the terminal detects that entry conditions to this state has been terminated.