Uplink Power Amplifier Mode Switching for Longer UE Battery Life
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE-Advanced, consume excessive power due to the requirement of multiple power amplifiers for multiple antenna transmission modes, which reduces battery life in user equipment (UE).
Innovation Solution
Implementing a reduced power amplifier (PA) mode that allows user equipment to operate with a subset of power amplifiers, enabling multiple antenna transmission while minimizing power consumption by using either one antenna mode, antenna selection mode, or LTE mode, and allowing user equipment to send preference signals to eNodeB for transitioning to these modes based on battery status and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power amplifiers are used for multiple antenna transmission modes in LTE-Advanced, then transmission capability and data rate are improved, but power consumption increases significantly
Solution Approach 1:
The system dynamically switches between full PA mode (all PAs active) and reduced PA mode (subset of PAs active) based on real-time channel conditions and traffic requirements. This dynamic adaptation allows the transmission capability to be adjusted according to actual needs, reducing power consumption when full capability is not required while maintaining high performance when needed.
Solution Approach 2:
The invention changes the operational parameter of power amplifier activation state. By transitioning from a state where all PAs are active to a state where only a subset is active, the system reduces power consumption while maintaining acceptable transmission capability through intelligent selection of which PAs to activate based on channel conditions and traffic patterns.
2Reliability
If multiple power amplifiers are activated for SU-MIMO and MU-MIMO modes, then uplink transmission performance is improved, but battery life in user equipment is reduced
Solution Approach 1:
Instead of always activating all power amplifiers for SU-MIMO and MU-MIMO modes, the system applies partial action by activating only the necessary subset of PAs required for the current transmission mode and channel conditions. This reduces power consumption and extends battery life while maintaining sufficient uplink transmission performance through intelligent PA selection and mode switching.
Solution Approach 2:
The system dynamically adjusts the number of active power amplifiers based on real-time assessment of channel conditions, traffic requirements, and battery status. This dynamic adaptation allows the system to extend battery life during periods of low activity or good channel conditions while maintaining high transmission performance when needed, resolving the contradiction between reliability and duration.
3Adaptability or versatility
If the system supports multiple transmission modes (T×D, SU-MIMO, MU-MIMO), then adaptability and transmission versatility are improved, but device complexity increases
Solution Approach 1:
The system implements a universal power amplifier selection mechanism that can handle multiple transmission modes (T×D, SU-MIMO, MU-MIMO) through a unified framework. This universal approach reduces device complexity by using a single intelligent selection algorithm and control structure that adapts to different modes, rather than requiring separate complex control mechanisms for each transmission mode.
Solution Approach 2:
The invention manages complexity by changing the operational parameters (which PAs are active, which transmission mode is used) rather than changing the fundamental system architecture. This parameter-based control allows the system to support multiple transmission modes with reduced complexity, as the same hardware and control structure can adapt to different modes through parameter adjustment rather than requiring dedicated complex subsystems for each mode.
Data Source
AI summary
A user equipment (UE) that supports multiple antenna transmission via multiple power amplifiers may operate in a reduced power amplifier (PA) mode. When operating in the reduced PA mode, a subset of the UE's power amplifiers are used to transmit uplink signals. A UE may send a preference signal to an e-Node B to request that the UE operate in the reduced PA mode.