Power Control Loops for Physical Channels in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing power control for physical channels with short transmission time intervals (TTIs), which are necessary for reducing latency and improving radio resource efficiency, especially in LTE and 5G networks.
Innovation Solution
The implementation of faster closed loop power control for physical channels with different TTI lengths, including separate or common power control loops for short and normal TTIs, reduces memory requirements and enables efficient power management across various TTI durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional power control methods are used for physical channels with short TTIs, then power control regulation speed is insufficient, but implementing faster power control increases system complexity
Solution Approach 1:
The patent segments the power control system into separate power control loops for different TTI lengths (e.g., one loop for short TTIs and another for normal TTIs). Each loop independently manages power control parameters specific to its TTI type, enabling faster regulation for short TTIs without complicating the overall system by isolating the complexity into modular, manageable segments.
2Measurement precision
If separate power control loops are implemented for different TTI lengths, then power control precision is improved, but memory requirements increase
Solution Approach 1:
The patent implements a unified power control framework where a single power control loop can serve multiple TTI lengths by dynamically adjusting its parameters. This multi-functional approach allows the system to maintain high power control precision for different TTI types while avoiding the need for completely separate loops, thereby reducing memory requirements through parameter sharing and reuse.
3Loss of time
If shorter TTIs are used to reduce latency, then packet data latency is reduced, but power control management becomes more difficult
Solution Approach 1:
The patent employs dynamic power control mechanisms that adapt to varying TTI lengths in real-time. The power control parameters and loop configurations are dynamically adjusted based on the active TTI type, enabling the system to achieve low latency with short TTIs while managing complexity through adaptive, context-dependent control strategies rather than static, rigid configurations.
Data Source
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AI summary
Systems and methods for performing power control of physical channels in a communication system are provided. In one exemplary embodiment, a method in a wireless device (105, 200, 300, 400, 600) for performing power control of physical channels in a wireless communication system (100) may include determining (503, 703) transmission powers for transmissions (123a-d, 133a-b) on physical channels (121, 131) having different transmission time interval lengths (125, 135) according to respective power control loops. Further, the loops may specify the transmission powers for the physical channels based on a parameter (111) whose value is commonly updated or separately updated for the loops.