Uplink Power Control for Shortened TTI in Multi-Cell Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently controlling power for shortened Transmission Time Intervals (TTIs), particularly in multi-cell environments, leading to inefficiencies in uplink signal transmission.
Innovation Solution
A method for power control in wireless communication systems that involves receiving downlink signals from multiple cells at different time points and transmitting uplink signals after processing times, with prioritization of uplink transmission power based on the timing of received downlink signals, ensuring efficient power allocation even with varying processing times across cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink signals are transmitted simultaneously through multiple cells with different processing times, then transmission efficiency is improved, but power allocation becomes complex and unreliable
Solution Approach 1:
The patent applies preliminary action by determining a priority order for uplink signals before simultaneous transmission occurs. The terminal device pre-establishes the priority sequence based on processing times of different cells, ensuring that power allocation follows a predetermined reliable pattern rather than being decided dynamically during transmission, thus resolving the contradiction between transmission efficiency and power allocation reliability
Solution Approach 2:
The patent changes the parameter of power allocation from equal distribution to priority-based distribution. By adjusting the power allocation parameter according to the priority order determined by processing times, the system ensures that cells with longer processing times receive sufficient power first, making the power allocation reliable while maintaining simultaneous transmission efficiency
2Speed
If processing time is reduced for shortened TTI, then transmission speed is improved, but power control accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining the priority order of uplink signals based on processing times before the actual transmission occurs. This advance planning allows the system to maintain accurate power control decisions even when the actual transmission time is shortened, as the power allocation strategy is already optimized before the reduced TTI execution begins
Solution Approach 2:
The patent introduces dynamics by adapting the power control strategy to different processing time scenarios. The system dynamically adjusts power allocation based on the priority order derived from processing times, allowing flexible and accurate power control that adapts to the shortened TTI requirements while maintaining transmission speed
Data Source
AI summary
The present application discloses a method for transmitting uplink signals through multiple cells in a wireless communication system. Particularly, the uplink signal transmission method comprises: a step of receiving a first downlink signal at a first timing through a first cell and receiving a second downlink signal at a second timing through a second cell; a step of transmitting a first uplink signal, corresponding to the first downlink signal, through the first cell after a first processing time has elapsed since the first timing; and a step of transmitting a second uplink signal, corresponding to the second downlink signal, through the second cell after a second processing time has elapsed since the second timing, wherein, if the first uplink signal and the second uplink signal are transmitted at the same timing, uplink transmission power is allocated first to the uplink signal corresponding to the downlink signal received at the preceding timing between the first timing and the second timing.