Adapting Transient Time for Variable TTI Patterns
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Solution Overview
Problem
Current LTE systems face performance reduction due to the fixed transient time for ON/OFF power transitions, which becomes significant with shorter Transmission Time Intervals (TTIs), particularly affecting system performance when using TTIs shorter than 1 ms.
Innovation Solution
Adapting the transient time for transmit power level changes based on the specific TTI duration, allowing for dynamic adjustment of transient times for different TTI patterns, thereby optimizing power transition durations for various TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed transient time is used for ON/OFF power transitions, then the system maintains simplicity in power management, but system performance degrades when using shorter TTIs
Solution Approach 1:
The patent implements dynamic transient time adjustment by mapping different TTI durations to specific transient time values. The transient time is no longer fixed but adapts based on the TTI pattern being used, allowing the power management system to optimize performance for each TTI length while maintaining manageable complexity through predefined mappings.
Solution Approach 2:
The patent changes the transient time parameter based on the TTI duration. By establishing a relationship where transient time varies with TTI length, the system can achieve better performance for shorter TTIs while maintaining appropriate power transition characteristics for different transmission scenarios.
2Reliability
If the transient time is reduced for shorter TTIs, then system performance improves, but the power transition may become insufficiently stable
Solution Approach 1:
The patent adjusts the transient time parameter specifically for shorter TTIs to optimize performance, while maintaining separate, appropriately longer transient times for longer TTIs. This parameter adaptation allows the system to achieve performance improvements for short TTIs without compromising the stability requirements of other transmission scenarios.
3Productivity
If different transient times are used for different TTI patterns, then operational efficiency is enhanced, but device complexity increases
Solution Approach 1:
The patent implements a dynamic transient time selection mechanism that automatically adjusts the transient time based on the active TTI pattern. This dynamic approach enhances operational efficiency by optimizing power transitions for each TTI type while managing complexity through automated selection rather than manual configuration.
Solution Approach 2:
The patent creates a universal transient time management system that handles multiple TTI patterns through a single adaptive mechanism. The same power management infrastructure serves multiple TTI durations by dynamically selecting appropriate transient times, avoiding the need for separate dedicated systems for each TTI type.
Data Source
AI summary
A wireless device (810) obtains (904) a first transmission time interval (TTI) for transmitting a first signal, and determines (908), based on the first TTI, a first transient time associated with the first TTI that defines a first duration during which a transmit power level of the wireless device changes. The wireless device transmits (912) the first signal using the first transient time. The wireless device obtains (916) a second TTI for transmitting a second signal, wherein a length of the second TTI is different from a length of the first TTI. The wireless device determines (920), based on the second TTI, a second transient time associated with the second TTI that defines a second duration during which the transmit power level of the wireless device changes that is different from the first transient time. The wireless device transmits (924) the second signal using the second transient time.