Mobile Transmit Diversity Phase Difference Delay Determination
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Solution Overview
Problem
Mobile communication devices lack accurate determination of system delay between transmit diversity signals and feedback signals, leading to potential beam divergence due to incorrect interpretation of phase differences, especially in fading conditions.
Innovation Solution
A method where a mobile communication device transmits multiple transmit diversity signals with varying phase differences and determines system delay by analyzing feedback signal patterns, exceeding a threshold to identify the correct delay, thereby optimizing beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standard handshake identification is used to determine system delay, then device complexity is reduced, but measurement precision deteriorates due to inadequate and unreliable delay determination
Solution Approach 1:
The patent implements a feedback-based delay determination mechanism where the mobile device transmits test signals with different phase differences and analyzes the feedback signals from the base station to identify the correct system delay. The feedback signal patterns contain information about the actual delay, which the mobile device extracts by comparing expected vs. actual feedback patterns, thereby achieving accurate delay measurement without increasing overall system complexity.
Solution Approach 2:
The mobile device autonomously determines the system delay by independently analyzing feedback signal patterns without requiring external intervention or complex network-side coordination. The device uses its own transmitted test signals and the received feedback to self-correct and identify the correct delay value, making the delay determination process self-service and avoiding additional system complexity.
2Device complexity
If system delay is not accurately determined, then device complexity remains low, but reliability deteriorates due to beam divergence in fading conditions
Solution Approach 1:
The patent applies preliminary action by having the mobile device transmit test signals with predetermined phase differences before actual data transmission. By performing this preliminary delay determination phase, the system identifies the correct system delay in advance, ensuring reliable beamforming during subsequent operations even in fading conditions, without adding complexity to the main transmission process.
Solution Approach 2:
The patent changes the phase difference parameter of transmitted signals systematically to probe different delay hypotheses. By varying the phase difference parameter across multiple test transmissions and observing corresponding feedback patterns, the mobile device identifies the correct system delay, thereby improving reliability of beamforming without requiring complex hardware modifications.
3Measurement precision
If feedback signal analysis is performed to determine system delay, then measurement precision improves, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent segments the feedback signal analysis into distinct, manageable steps: receiving feedback signals, comparing expected vs. actual patterns, identifying mismatches, and determining the correct delay. This segmentation of the complex analysis process into discrete operational stages reduces implementation complexity while maintaining high measurement precision through systematic pattern matching.
Data Source
AI summary
A mobile communication device and a method of controlling same, in which the mobile communication device transmits a plurality of transmit diversity signals comprising a first transmit signal and a second transmit signal differing at least by values of a transmit diversity parameter, receives a plurality of feedback signals from at least one base station in response to the plurality of transmit diversity signals; and determines a system delay based on detecting that a number of expected feedback signal patterns among the received plurality of feedback signals exceeds a system delay threshold.