Timeout Value Configuration for MTC Uplink Synchronization
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Solution Overview
Problem
Machine-type communication devices (MTC devices) in cellular radio communication systems face challenges with power consumption and uplink synchronization due to infrequent transmissions, leading to inefficient power use and increased interference, as they frequently lose uplink synchronization and struggle with accurate uplink transmission power control.
Innovation Solution
The method involves setting a timeout value for radio transmission parameters based on mobility information, allowing MTC devices to update these values less frequently, thereby reducing power consumption and improving uplink synchronization and power control efficiency by extending DRX sleep periods and using cached values for longer periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices perform frequent transmissions to maintain uplink synchronization, then uplink synchronization is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the timeout value configurable and adaptable based on device mobility characteristics. The system dynamically adjusts the timeout value - using longer timeouts for stationary devices and shorter timeouts for mobile devices - allowing the uplink synchronization mechanism to adapt its behavior to match actual device conditions, thereby reducing unnecessary synchronization attempts for stationary devices while maintaining reliability for mobile ones
Solution Approach 2:
The patent changes the timeout parameter from a fixed value to a configurable value that can be adjusted based on mobility information. By modifying this key parameter, the system enables stationary devices to maintain synchronization for longer periods without frequent updates, directly reducing power consumption while maintaining uplink synchronization reliability
2Reliability
If MTC devices update radio transmission parameters frequently, then uplink synchronization is maintained, but power consumption and interference increase
Solution Approach 1:
The system dynamically adjusts the timeout value based on device mobility - using longer timeouts for stationary devices and shorter timeouts for mobile devices. This dynamic adaptation reduces unnecessary parameter updates from stationary devices, thereby reducing uplink interference while maintaining synchronization reliability
Solution Approach 2:
By changing the timeout parameter from fixed to configurable, the system reduces the frequency of parameter updates for stationary devices. This parameter change directly reduces the number of uplink transmissions needed for synchronization, thereby reducing interference while maintaining reliability
3Device complexity
If MTC devices use fixed timeout values, then system complexity is reduced, but power efficiency and synchronization accuracy deteriorate
Solution Approach 1:
The patent changes the timeout parameter from fixed to configurable, allowing the system to optimize power efficiency and synchronization accuracy for different device types. The network can configure appropriate timeout values based on device mobility characteristics, achieving better power efficiency without significantly increasing system complexity
Solution Approach 2:
The system enables devices to self-identify their mobility characteristics and receive appropriate timeout configurations from the network. This self-service approach allows devices to operate efficiently with optimized timeout values without requiring complex centralized control, balancing power efficiency with manageable system complexity
4Device complexity
If MTC devices use fixed timeout values, then system complexity is reduced, but synchronization accuracy for mobile devices deteriorates
Solution Approach 1:
The system dynamically adjusts timeout values based on device mobility - using shorter timeouts for mobile devices to maintain synchronization accuracy. This dynamic adaptation ensures that mobile devices receive timely synchronization updates without requiring complex manual configuration, maintaining accuracy while keeping system complexity manageable
Solution Approach 2:
By changing the timeout parameter from fixed to configurable, the system can optimize synchronization accuracy for mobile devices through appropriate parameter selection. The network can configure shorter timeout values for mobile devices to ensure timely synchronization updates, achieving better accuracy without significantly increasing system complexity
Data Source
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AI summary
A method in a user equipment (110) and a user equipment (110) for setting a timeout value, indicative of a duration during which a value related to radio transmissions is to be reused by the user equipment, are provided. The user equipment obtains a timeout value, which is based on mobility information indicating mobility of the user equipment. Then, the user equipment sets the timeout value. Furthermore, a method in a radio network node (120) and a radio network node (120) for setting a timeout value, indicative of a duration during which a value related to radio transmissions is to be reused by the radio network node, are provided. The radio network node obtains a timeout value, which is based on mobility information indicating mobility of the user equipment. Then, the radio network node sets the timeout value for the user equipment.