Uplink Timing Control via Periodic Sleep Mode
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Solution Overview
Problem
Conventional wireless communication systems face challenges in efficiently managing uplink timing adjustments, particularly in MIMO systems, where power consumption and transmission overhead are high due to continuous monitoring for timing updates, and existing methods either consume excessive power or incur high overhead.
Innovation Solution
A method and apparatus that enter a sleep mode for a predetermined period, wake to check for timing adjustment commands, and adjust uplink timing as needed, reducing unnecessary power usage and transmission overhead by only updating when required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous monitoring for timing adjustment commands is performed, then uplink timing accuracy is improved, but power consumption increases
Solution Approach 1:
The mobile device transitions between active and sleep modes periodically, monitoring for timing adjustment commands only at scheduled intervals rather than continuously. The device wakes from sleep mode to check for commands and returns to sleep mode when no commands are present, reducing power consumption while maintaining timing accuracy when needed.
2Measurement precision
If continuous monitoring for timing adjustment commands is performed, then uplink timing accuracy is improved, but transmission overhead increases
Solution Approach 1:
The system extracts and processes only the essential timing adjustment commands from the downlink signals, rather than continuously monitoring and processing all downlink transmissions. The mobile device selectively monitors for specific timing adjustment commands only when in active mode, reducing the amount of data processing and transmission overhead required.
3Loss of time
If the mobile device wakes frequently to check for timing adjustment commands, then timing update timeliness is improved, but power consumption increases
Solution Approach 1:
The mobile device dynamically adjusts its monitoring behavior based on operational conditions, transitioning between active and sleep modes as needed. The device remains in sleep mode to conserve power and only wakes when timing updates are actually required, making the monitoring process adaptive rather than fixed, thus balancing timeliness with power efficiency.
Data Source
AI summary
Systems and methodologies are described that facilitate evaluating and utilizing timing updates in a wireless communications network. A base station can transmit timing adjustment commands to mobile devices as needed as opposed to a periodic timing update where timing adjustment commands are always sent within a certain period. However, the mobile devices need to stay awake to monitor the timing adjustment message resulting in high power consumption. On the other hand with periodic update, the mobile devices can wake up to check whether there is a timing adjustment for itself and, if not, return to a sleep mode. With the proposed method, a mobile device can sleep for a period of time to check for timing adjustment commands upon waking. Thus, both the mobile power consumption and downlink signaling overhead are reduced.