Uplink Power Control Across Variable-Length 5G TTIs
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Solution Overview
Problem
There is currently no effective solution for uplink power control in the context of short Transmission Time Intervals (TTIs) in 5G communication systems, which is crucial for reducing latency and ensuring reliable transmission while minimizing interference and battery consumption.
Innovation Solution
An uplink power control method and apparatus that adjusts transmission power based on power control parameters, including power accumulation and offset amounts, specifically for TTIs of varying lengths, ensuring accurate power determination even when data and Demodulation Reference Signals (DMRS) are transmitted in different TTIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If TTI length is reduced to achieve ultra-low latency, then transmission delay is reduced, but uplink power control becomes ineffective and transmission reliability deteriorates
Solution Approach 1:
The patent segments the TTI into two distinct parts: a first TTI for transmitting DMRS (demodulation reference signal) and a second TTI for transmitting data. This segmentation allows the power control mechanism to operate effectively on the DMRS transmission while the data transmission benefits from the shortened overall TTI structure, thereby reducing latency without sacrificing reliability.
Solution Approach 2:
The patent applies preliminary action by transmitting the DMRS in the first TTI before the data in the second TTI. The power control parameter is determined based on the DMRS transmission, allowing the system to establish power control settings in advance before data transmission occurs. This ensures that power control remains effective even as the overall TTI length is reduced for latency optimization.
2Measurement precision
If power accumulation amount is continuously updated for each TTI, then power control precision is improved, but system complexity increases when TTI lengths vary
Solution Approach 1:
The patent applies local quality by treating the DMRS transmission and data transmission differently in terms of power control. The power accumulation amount is specifically updated based on the DMRS transmission characteristics, and this localized power control approach is then applied to the data transmission. This allows precise power control for the critical DMRS portion without requiring complex power control mechanisms for the entire variable-length TTI structure.
Data Source
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AI summary
Provided by the present invention are an uplink power control method and apparatus, the method comprising: a UE side acquiring a power control parameter when an uplink channel is transmitted using one TTl length among multiple TTl lengths or an uplink channel is transmitted using one timing among multiple timings; and determining a transmission power of the uplink channel according to the power control parameter, the uplink channel being a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). Thus, the problem of controlling uplink power using TTIs of different lengths which is present in existing technology may be solved by means of the steps in the present invention.