Asymmetric Perturbation for Mobile Transmit Diversity
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Solution Overview
Problem
Mobile transmit diversity devices face challenges in efficiently adjusting phase differences to optimize power consumption and maintain effective communication range, particularly at the cell edge where high power is required, while minimizing battery drain and excessive power consumption.
Innovation Solution
A mobile device adjusts transmit diversity parameters, such as phase differences between multiple antennas, based on feedback signals from a base station to achieve beamforming, allowing for power savings by dynamically changing phase differences and using power amplifiers at reduced specifications when possible, and switching between diversity and non-diversity operation to conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmit diversity is used to extend communication range and achieve beamforming, then effective radiated power at base station is improved, but power consumption at mobile device increases
Solution Approach 1:
The patent applies dynamics by making the transmit diversity configuration dynamic rather than static. The mobile device alternates between diversity and non-diversity transmit configurations in time-varying manner, adapting to channel conditions and base station feedback. This dynamic switching allows the system to achieve beamforming gains when needed while conserving power during periods when diversity is less critical, thus resolving the contradiction between maintaining high effective radiated power and reducing power consumption.
Solution Approach 2:
The patent implements periodic action through cyclic switching between diversity and non-diversity transmission modes. The mobile device periodically changes its transmit configuration based on predetermined patterns or feedback-driven adaptations. This periodic switching enables the system to capture beamforming benefits during diversity phases while recovering power during non-diversity phases, effectively managing the trade-off between transmitted power and consumed power over time.
2Reliability
If phase differences are adjusted to optimize beamforming performance, then signal quality at base station is improved, but complexity of phase adjustment increases
Solution Approach 1:
The patent applies feedback by using base station responses (such as TPC commands or signal quality indicators) to guide phase difference adjustments. The mobile device transmits test signals with different phase configurations and uses the base station's feedback to determine which phase settings yield better reception. This feedback-driven approach simplifies the complexity by providing clear directional guidance for phase optimization rather than requiring exhaustive search or complex algorithms, thus improving signal quality while managing adjustment complexity.
Solution Approach 2:
The patent implements parameter changes by systematically varying phase difference parameters to optimize beamforming. Instead of adjusting multiple parameters simultaneously, the method focuses on changing phase differences in a controlled manner based on feedback. This parameter change strategy reduces complexity by isolating the optimization variable while maintaining signal quality through iterative refinement of the phase configuration.
3Use of energy by moving object
If power amplifiers operate at reduced specifications to save power, then power consumption is reduced, but transmit power capability decreases
Solution Approach 1:
The patent applies dynamics by enabling the mobile device to switch between different transmit configurations (diversity and non-diversity) with different power amplifier requirements. During non-diversity modes, reduced-specification power amplifiers can be used to save power. During diversity modes, full power capability is activated when needed for signal quality or coverage. This dynamic adaptation resolves the contradiction by matching amplifier capability to actual transmission needs rather than operating at fixed power levels.
Solution Approach 2:
The patent implements partial action by using reduced-specification power amplifiers that provide sufficient power for non-diversity transmission but would be insufficient for full-power diversity transmission. The system accepts partial power capability in exchange for power savings during normal operation, and only activates full power capability when diversity mode is engaged and absolutely necessary, thus balancing power consumption against transmit power capability.
Data Source
AI summary
A method and apparatus for selectively adjusting transmit diversity parameters in a mobile communication system including a mobile device and a base station. The mobile device transmits a signal set comprised of a plurality of signals differing only in phase from one another, receive in response an input parameter for each set, and adjust the phase difference of a subsequently transmitted signal set as a function of the input parameters.