User Terminal Power Allocation for Varying TTI Lengths
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Solution Overview
Problem
In existing LTE systems, the fixed 1 ms TTI duration leads to challenges in controlling transmission power when signals of varying TTI lengths are transmitted simultaneously, potentially reducing communication throughput and degrading received quality.
Innovation Solution
A user terminal is equipped with a transmission section for signals using varying TTI lengths and a control section that allocates transmission power preferentially to either signal when their combined power exceeds the maximum, using priority rules to manage power allocation between long and short TTIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TTIs of varying lengths are transmitted simultaneously, then communication flexibility and service diversity are improved, but transmission power control becomes difficult and communication quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power allocation based on TTI length parameters. Different TTI lengths (short TTI for low latency services, long TTI for high throughput services) are assigned different power allocation ratios. The base station configures power control parameters including power offset values and priority levels for each TTI type, allowing the system to adapt power distribution to match the specific requirements of each service type while maintaining overall communication quality.
2Ease of operation
If transmission power is allocated equally to all TTIs, then power control simplicity is maintained, but power-limited states occur and throughput is reduced
Solution Approach 1:
The patent implements local quality by applying differentiated power control strategies to different TTI types based on their specific characteristics. Short TTIs (used for low-latency services like URLLC) are assigned higher power priority and larger power offsets to ensure reliable rapid transmission. Long TTIs (used for high-throughput services like eMBB) are assigned appropriate power levels for their extended duration. This localized power quality adjustment ensures each TTI type receives optimal power allocation for its specific function, preventing power-limited states while maintaining efficient power control.
Data Source
AI summary
The present invention is designed so that transmission power is controlled adequately even when communication is performed using a plurality of transmission time intervals (TTIs) of varying lengths. According to one aspect of the present invention, a user terminal has a transmission section that transmits signals using a plurality of transmission time intervals (TTIs) of varying lengths, and a control section that controls the transmission power of a first signal that is transmitted in a first TTI, and the transmission power of a second signal that is transmitted in a second TTI having a shorter TTI duration than the first TTI, and, when the total transmission power of the first signal and the second signal that are transmitted in an overlapping manner exceeds the maximum transmission power, the control section exerts control so that transmission power is preferentially allocated to one of the first signal and the second signal.