Transmit Power Gain Control in Mobile RF Front Ends

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Solution Overview

Problem

Existing mobile communication devices face challenges in efficiently managing transmit power to minimize interference with neighboring channels while optimizing power usage, as current systems lack precise control over power gain levels, leading to suboptimal performance and battery consumption.

Innovation Solution

A mobile communication device comprising a processor, transceiver circuit, amplifier circuit, and control logic circuit that generates and controls gain signals to output transmission signals at specific power gain levels, with the transceiver adopting power gain levels in an increasing sequence and the amplifier switching power gain by no more than 1-level difference to ensure efficient power allocation and minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transmit power is increased to improve signal coverage, then signal transmission quality is improved, but interference with neighboring channels increases

Engineering Contradiction:

Improvesignal transmission qualityVSAvoidinterference with neighboring channels

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements dynamic transmit power control by allowing the mobile communication device to autonomously adjust power gain levels based on received TPC commands and channel conditions. The device switches between multiple power gain levels (first plurality for transceiver, second plurality for amplifier) to dynamically optimize signal quality while controlling interference, rather than using fixed power levels.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the power gain parameter by providing multiple discrete power gain levels (e.g., 6 dBm, 16 dBm, 22 dBm, 31 dBm) that can be selectively activated. The control logic circuit switches between these parameter values based on TPC commands, enabling precise control over transmit power to balance signal quality and interference reduction.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If power gain levels are increased to improve transmission power control precision, then power usage management is improved, but device complexity increases

Engineering Contradiction:

Improvepower gain level control precisionVSAvoidpower control system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the power control system into two distinct stages: a transceiver circuit with a first plurality of power gain levels and an amplifier circuit with a second plurality of power gain levels. This segmentation allows each stage to handle specific power adjustments, achieving fine-grained power control precision while distributing system complexity across modular components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control logic circuit acts as an intermediary that receives TPC commands from the base station and translates them into appropriate power gain level selections for both the transceiver and amplifier circuits. This intermediary component simplifies the overall control architecture by centralizing the decision-making logic for power level switching.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If power gain switching is performed rapidly to adapt to changing channel conditions, then communication performance is improved, but signal linearity deteriorates

Engineering Contradiction:

Improvechannel adaptation speedVSAvoidsignal linearity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent implements periodic power gain switching based on TPC commands received at regular intervals from the base station. Rather than continuous or rapid switching, the system periodically adjusts power levels in response to structured control commands, maintaining signal linearity while adapting to channel conditions over time.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20130142225A1Mobile communication device capable of controlling ouput power and method thereof

Publication Date: 2013.06.06 HTC CORP

AI summary

A mobile communication device and a method thereof. The mobile communication device includes a processor, a transceiver circuit, an amplifier circuit, and a control logic circuit. The processor generates a baseband signal and a gain control signal. The transceiver circuit converts the baseband signal to an analog form, and amplifies the converted baseband signal to output a first transmission signal. The amplifier circuit amplifies the first transmission signal to output a second transmission signal. The control logic circuit controls the transceiver circuit and the amplifier circuit based on the gain control signal to generate the second transmission signal. The transceiver circuit adopts one of a first plurality of power gain levels at an increasing sequence when the amplifier circuit adopts a lowest level of a second plurality of power gain levels.