Terminal Transmit Power Control for Short TTI Latency
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Solution Overview
Problem
In wireless communication systems, determining transmission power efficiently for user equipment (UE) supporting multiple transmission time intervals (TTIs), processing times, or numerologies in a carrier aggregation (CA) system is challenging, particularly in reducing latency for next-generation mobile communication systems like new radio access technology (NR) and long-term evolution (LTE).
Innovation Solution
A method and apparatus for determining transmission power in a wireless communication system, where a terminal efficiently controls transmission power by configuring shortened transmission time intervals (sTTIs) and adjusting power control parameters for different TTI lengths and numerologies, enabling effective power management and latency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a plurality of transmission time intervals (TTIs) and numerologies are supported to reduce latency, then communication speed and responsiveness are improved, but device complexity and power management difficulty increase
Solution Approach 1:
The patent segments the transmission power control by introducing a separate power control parameter (delta_P) for each TTI length and numerology configuration. This allows independent power adjustment for each segment (TTI type) rather than using a unified power control mechanism, thereby managing the complexity of multi-TTI support through structured division.
Solution Approach 2:
The patent changes the power control parameters dynamically based on TTI length and numerology configuration. By introducing configurable parameters (delta_P values) that can be set differently for each TTI type, the system adapts power control to match the specific requirements of each transmission interval, resolving the contradiction between supporting multiple configurations and maintaining manageable complexity.
2Measurement precision
If transmission power is controlled for multiple TTI lengths and numerologies, then power management accuracy is improved, but control complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific power control parameters (delta_P) to each TTI length and numerology configuration individually. Each configuration receives tailored power control settings optimized for its specific characteristics, rather than applying a uniform power control approach, thereby achieving accurate local power management for each transmission type.
Solution Approach 2:
The patent introduces configurable power control parameters that can be independently adjusted for each TTI length and numerology. This parameter-based approach allows precise control of transmission power for each configuration while maintaining a standardized control framework, balancing accuracy with manageable complexity.
3Loss of time
If shortened TTIs are configured to reduce latency, then response time is improved, but power control difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring power control parameters (delta_P values) for different TTI lengths before actual transmission occurs. The base station and terminal agree on these parameters in advance through RRC signaling, so that when shortened TTIs are activated for low-latency communication, the power control settings are already prepared and immediately applicable, avoiding complex real-time calculations.
Solution Approach 2:
The patent changes power control parameters based on TTI length configuration. By introducing delta_P as a configurable parameter that varies with TTI length, the system adapts power control to the specific timing requirements of shortened TTIs, achieving both low latency and manageable power control through parameter-based adaptation.
Data Source
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AI summary
Disclosed is a method for determining transmit power in a wireless communication system according to one embodiment of the present invention. The method, which is performed by a terminal, comprises the steps of: receiving a semi-persistent scheduling (SPS) setting of a short transmission time interval (sTTI); receiving control information for SPS-related transmit power control according to the received setting; and determining an SPS-related transmit power by using a transmit power control (TPC) command included in the received control information, wherein the control information may include a TPC command for each of a plurality of TTI lengths, which includes an SPS-related TPC command of the sTTI.