Transmit Diversity Probe Initialization for Mobile Base Station Registration

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Solution Overview

Problem

In transmit diversity systems, the lack of feedback from the base station during initial registration of a mobile device hinders efficient beamforming and reduces the extended range potential, especially when using multiple sub-power power amplifiers to conserve current.

Innovation Solution

A method where a mobile communication device initiates communication by transmitting probe signals using a low power amplifier, then switches to a high power amplifier if no acknowledgement is received, and finally uses both amplifiers with varying transmit diversity parameters to optimize signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If multiple sub-power power amplifiers are used to conserve current, then power consumption is reduced, but the communication range and signal strength are insufficient for initial base station registration

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication range

Core Design Contradiction:

Use of energy by moving objectVSLength of moving object

Solution Approach 1:

The patent segments the power amplification function into multiple sub-power power amplifiers (e.g., two amplifiers each providing half the power of a single full-power amplifier). These segmented amplifiers can be operated independently or simultaneously, allowing the system to conserve power by using only one amplifier when possible, while still achieving full power output when both are used together for extended range communication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects which power amplifiers to activate based on communication needs. During initial registration when range is critical, both sub-power amplifiers are activated simultaneously to achieve maximum effective radiated power. During normal operation with feedback available, the system can dynamically adjust and use only one amplifier, thereby conserving power while maintaining adequate communication performance.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If transmit diversity parameters are adjusted without feedback from base station, then initial registration can proceed, but beamforming efficiency and range extension are reduced

Engineering Contradiction:

Improveinitial registration capabilityVSAvoidbeamforming efficiency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by having the mobile device transmit probe signals using multiple sub-power power amplifiers simultaneously during initial registration, before receiving feedback from the base station. This preliminary transmission with enhanced power (achieved by combining multiple amplifiers) enables the mobile device to establish initial contact and register with the base station even in the absence of feedback, thereby solving the chicken-and-egg problem of needing feedback to optimize parameters that are needed for successful registration.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9210672B2Method and apparatus for random access channel probe initialization using transmit diversity

Publication Date: 2015.12.08 GOOGLE LLC

AI summary

Embodiments of the present invention may separately utilize transmit paths of a mobile transmit diversity device to initialize communication with a base station over a random access channel, particularly where the transmit paths have power amplifiers with different characteristics, e.g., different power amplification.