Wireless Timer Configuration for RTT Alignment
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Solution Overview
Problem
Inconsistent default timer configurations in 3G mobile communications systems lead to inefficient resource utilization and delayed reset procedures due to mismatched timer values relative to round trip time (RTT), causing unnecessary delays in retransmissions and signaling processes.
Innovation Solution
Setting default values of timers Timer_RST and Timer_Poll to a value equal to or greater than the Round Trip Time (RTT) to ensure timely retransmission and polling operations, thereby optimizing system efficiency and reducing resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timer values are set larger than RTT to cover processing variance, then reliability of retransmission is improved, but transmission delay increases
Solution Approach 1:
The patent changes the timer parameter values from fixed large values (300ms, 500ms) to dynamically adjusted values based on measured RTT. The timer is set to RTT plus a fixed offset (e.g., RTT+20ms or RTT+40ms), optimizing the balance between reliability and delay by adapting to actual network conditions rather than using conservative fixed values.
2Adaptability or versatility
If inconsistent default timer values are used across specifications, then compatibility with different implementations is maintained, but system efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic timer adjustment where the timer value is no longer fixed but adapts based on measured RTT. The system dynamically calculates optimal timer values (RTT+20ms or RTT+40ms) based on actual network conditions, allowing the timer to adapt to varying network latencies while maintaining consistent behavior across different implementations.
Data Source
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AI summary
A method for setting default values of timers in a wireless communications system includes setting default values of timers Timer_RST and Timer_Poll to be a first value (302). The timers Timer_RST and Timer_Poll are used to respectively hold retransmission of a reset signaling packet and a polling until an expected response is received.