Uplink Power Control for Multiple TTI Types
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Solution Overview
Problem
Power control for multiple time intervals in LTE and LTE-Advanced systems is challenging due to the lack of effective methods for handling power control across different types of transmission time intervals, particularly since existing solutions only address legacy TTI and not multiple types.
Innovation Solution
A communication device with a processing circuit and storage device that determines and manages power levels for multiple uplink transmissions within different time intervals, ensuring that the sum of power levels does not exceed a power limit, allowing for efficient transmission across non-overlapping intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power control is designed only for legacy TTI, then legacy transmission is supported, but multiple TTI types (shortened and legacy) cannot be handled simultaneously
Solution Approach 1:
The power control mechanism is segmented into distinct handling procedures for different TTI types. The system divides uplink transmissions into shortened TTI transmissions and legacy TTI transmissions, applying separate power control logic to each segment. This allows the system to support multiple TTI types without creating a single complex unified power control mechanism.
Solution Approach 2:
The power control mechanism is designed with multi-functionality to handle both shortened TTI and legacy TTI transmissions. By creating a universal power control framework that can adapt to different TTI types through configurable parameters and conditional logic, the system achieves versatility without proportionally increasing complexity.
2Productivity
If multiple uplink transmissions are performed in overlapping time intervals, then transmission efficiency increases, but power level limit may be exceeded
Solution Approach 1:
The system performs preliminary power level determination before executing multiple uplink transmissions. By calculating and establishing appropriate power levels for each transmission in advance, the system ensures that the sum of power levels will not exceed the power limit, preventing compliance violations before they occur.
Solution Approach 2:
The power control mechanism incorporates feedback by continuously monitoring the sum of power levels across simultaneous transmissions and adjusting individual transmission power levels accordingly. This feedback loop ensures that power level limits are maintained while allowing multiple transmissions to proceed efficiently.
3Reliability
If power levels are adjusted dynamically for different time intervals, then transmission reliability improves, but control complexity increases
Solution Approach 1:
The system implements dynamic power level adjustment for different time intervals and transmission types. Power levels are adapted in real-time based on the specific TTI type, transmission priorities, and power level constraints, improving reliability while maintaining manageable complexity through structured dynamic control.
Solution Approach 2:
The power control mechanism manages complexity by systematically changing power level parameters based on predefined conditions and transmission characteristics. By establishing clear parameter adjustment rules for different scenarios (shortened TTI vs. legacy TTI, overlapping vs. non-overlapping intervals), the system achieves reliable dynamic control without excessive complexity.
Data Source
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AI summary
A communication device for handling power control for multiple time intervals comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise determining a first power level for at least one first uplink (UL) transmission, a second power level for at least one second UL transmission and a third power level for at least one third UL transmission such that a sum of the first power level and the second power level is not greater than a power level limit of the communication device and a sum of the first power level and the at least one third power level is not greater than the power level limit.