Adaptive Sync Timer Control for LTE Mobile Stations
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Solution Overview
Problem
Existing wireless communication systems in LTE set timer lengths based on the highest mobile station speed, leading to incorrect judgment of synchronization states for slower-moving stations, causing increased latency and potential collisions due to non-orthogonal resource allocation.
Innovation Solution
Adaptive control of timer lengths for each mobile station based on its actual speed and synchronization state, minimizing incorrect synchronization judgments and reducing latency by ensuring accurate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timer lengths are set based on the highest mobile station speed, then synchronization reliability for high-speed stations is improved, but slower-moving stations are incorrectly judged out-of-sync causing increased latency
Solution Approach 1:
The patent dynamically adjusts the timer length parameter based on the mobile station's speed characteristics. High-speed stations receive longer timer lengths to maintain synchronization reliability, while slow-moving stations receive shorter timer lengths to enable faster synchronization state transitions and reduce latency. This parameter adaptation resolves the contradiction by making the timer length variable rather than fixed for all stations.
Solution Approach 2:
The system transitions from a static timer length configuration to a dynamic one where the timer length is adjusted according to the mobile station's speed and synchronization state. The base station monitors station speed and adaptively modifies the timer length, enabling the system to respond to changing conditions and optimize performance for different station types.
2Device complexity
If a fixed reference time period is used for all mobile stations, then system simplicity is maintained, but synchronization accuracy deteriorates for stations with different speeds
Solution Approach 1:
The patent applies different timer length values to different mobile stations based on their individual speed characteristics and synchronization states. Instead of using a uniform reference time period for all stations, the system tailors the timer length to each station's local conditions, improving synchronization timing accuracy for both high-speed and slow-moving stations while managing complexity through automated adaptation.
3Ease of operation
If timer timeout is used to judge out-of-sync state, then synchronization management is simplified, but slower-moving stations experience false out-of-sync judgments causing resource allocation issues
Solution Approach 1:
The patent modifies the timer length parameter based on mobile station speed to prevent false out-of-sync judgments. Slow-moving stations are assigned shorter timer lengths that are appropriate for their speed characteristics, preventing the timer from expiring due to normal timing variations. This maintains the simplicity of timer-based synchronization management while improving the reliability of synchronization state accuracy.
Data Source
AI summary
A wireless communication system is provided for reducing the probability that latency before data transmission increases when a mobile station that is actually in sync is judged to be out of sync. A base station causes the timing calculation part to calculate the timing advance (TA) of a transmit timing from the mth mobile station; causes the timer adaptive control part to obtain the traveling speed or the time variation in TA of the mth mobile station and, adaptively determines and outputs as the timer update information the length of the mth first timer within an M number in total of synchronization timers and the length of the second timer of the mth mobile station and update the length of the mth first timer; and transmits from the downlink transmission part a downlink signal which contains timer update information.