Uplink Signal Transmission Priority for Short TTI Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency for uplink transmission operations, particularly in supporting multiple transmission time intervals, subcarrier spacings, and processing times, which affects the efficiency of user equipment (UE) communication with the base station (eNB).
Innovation Solution
The proposed method involves a terminal that receives downlink control information with uplink grants and, when transmission timings overlap, prioritizes transmission on channels with shorter transmission time intervals (TTIs), using physical uplink control channels (PUCCH) or shortened PUCCH, and adjusts transmission power accordingly to manage overlapping signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits uplink signals on both the first channel and the second channel when their transmission timings overlap, then the data transmission completeness is improved, but the transmission power requirement increases and may exceed maximum power limits
Solution Approach 1:
The patent extracts the uplink signal from the first channel and relocates it to the second channel for transmission. When transmission timings overlap and power limits are exceeded, the terminal transmits only the second channel's signal, effectively removing the conflicting first channel transmission to resolve the power contradiction.
Solution Approach 2:
The patent changes the transmission parameter by selecting different channels based on TTI length. When the first channel has a longer TTI than the second channel, the terminal modifies its transmission strategy to use only the second channel, thereby adapting to power constraints while maintaining essential data transmission.
2Loss of time
If the terminal prioritizes transmission on the second channel with shorter TTI length, then the latency is reduced and transmission efficiency is improved, but the data transmission completeness may be compromised
Solution Approach 1:
The patent changes the transmission parameter by selecting different channels based on TTI length. When the first channel has a longer TTI than the second channel, the terminal modifies its transmission strategy to use only the second channel, thereby adapting to power constraints while maintaining essential data transmission.
Solution Approach 2:
The patent extracts the uplink signal from the first channel and relocates it to the second channel for transmission. When transmission timings overlap and power limits are exceeded, the terminal transmits only the second channel's signal, effectively removing the conflicting first channel transmission to resolve the power contradiction.
3Adaptability or versatility
If the terminal supports multiple TTI lengths and subcarrier spacings, then the adaptability and communication efficiency are improved, but the device complexity increases
Solution Approach 1:
The terminal dynamically adjusts transmission parameters including TTI length and subcarrier spacing based on channel conditions and network requirements. By configuring different TTI lengths (e.g., first TTI and second TTI with different durations) and subcarrier spacings, the system achieves adaptability while managing complexity through standardized parameter sets.
Solution Approach 2:
The patent introduces dynamic transmission timing adjustment mechanisms where the terminal can switch between different TTI lengths and subcarrier spacings. The transmission timing of uplink signals is dynamically configured based on the selected TTI length, allowing the system to adapt to varying latency requirements and channel conditions without requiring completely separate transmission paths.
Data Source
AI summary
An uplink transmitting method for a user equipment (UE) for supporting a short transmission time interval (TTI) in a wireless communication includes receiving downlink control information including uplink grant, and when a transmitting timing of an uplink signal corresponding to the uplink grant and a transmission timing of a semi-persistent (SPS) uplink signal overlap with each other, if a TTI length of a first channel in which the uplink signal corresponding to the uplink grant is to be transmitted is longer than a TTI length of a second channel in which the SPS uplink signal is to be transmitted, performing uplink signal transmission only on the second channel of the first channel and the second channel at the transmission timing.