Radio Access Network Reverse Link Reception Failure Handling
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Solution Overview
Problem
Conventional wireless telecommunication networks inefficiently manage resource allocation by using a fixed time period to determine contact loss with mobile stations, leading to inefficiencies as they either prematurely release resources or wait unnecessarily.
Innovation Solution
Implementing a dynamic test period based on the mobile station's transmit power level, where the network determines if the station was transmitting at maximum power and allows sufficient time for power increase before releasing resources, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed time period is used to determine contact loss, then the resource management is simple and consistent, but resources are either prematurely released or held unnecessarily long
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static fixed time period to a dynamic test period that adapts based on mobile station transmit power level. The test period is calculated as T_test = T_base + k*(P_max - P_current), where the period dynamically adjusts according to the power level difference. This allows the system to optimize resource release timing based on real-time conditions, improving both resource utilization efficiency and release timing accuracy simultaneously.
Solution Approach 2:
The patent implements parameter changes by modifying the test period duration based on the transmit power level parameter. When the mobile station is at maximum power level, the test period is shortest; when below maximum, the test period extends proportionally to the power deficit. This parameter-based adaptation resolves the contradiction by making the resource release decision both efficient and accurately timed based on actual signal conditions.
2Reliability
If the network waits for the full fixed period before releasing resources, then false call drops are reduced, but resource availability for other calls decreases
Solution Approach 1:
The dynamic test period calculation T_test = T_base + k*(P_max - P_current) enables the system to maintain high call drop accuracy while optimizing resource availability. By adjusting the test period based on actual transmit power levels, the system avoids both premature releases and unnecessary delays, ensuring resources are held only as long as needed to confirm genuine call failures.
Solution Approach 2:
The patent changes the test period parameter dynamically based on the mobile station's transmit power level. This parameter adjustment allows the system to achieve reliable call drop detection (maintaining accuracy) while minimizing the time resources are held, thereby improving overall resource availability for other calls without increasing false drops.
3Loss of time
If the network releases resources immediately upon detecting bad frames, then resource availability improves, but false call drops increase
Solution Approach 1:
The dynamic test period provides an optimized balance between resource release speed and call maintenance accuracy. Rather than immediate release or fixed-period release, the system calculates an appropriate waiting period based on transmit power levels, enabling faster resource release when appropriate while maintaining accuracy by extending the period when needed.
Solution Approach 2:
By changing the test period parameter based on the mobile station's transmit power level, the system achieves both fast resource release and high call maintenance accuracy. The parameter adjustment ensures that resources are released quickly when the mobile station is at maximum power (indicating genuine failure) while allowing sufficient monitoring time when power levels suggest potential recovery.
Data Source
AI summary
A radio access network (RAN) allocates a resource, such as a forward traffic channel, to a mobile station that is engaged in a call. During the call, the RAN monitors a reverse link signal that is received from the mobile station. If the RAN detects a reception failure, such as the receipt of an errored frame in the reverse link signal, the RAN determines the power level that the mobile station used to transmit the reverse link signal when the reception failure occurred. If the mobile station was already transmitting at its maximum power level, the RAN may immediately release the resource. Otherwise, the RAN defines a test period that is sufficient for the mobile station to increase its transmit power to the maximum level. If the reception failure continues throughout the test period, the RAN may then release the resource.