Terminal Power Reservation for Short TTI Uplink Signals
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Solution Overview
Problem
In communication systems, when transmitting uplink signals with different transmission time interval (TTI) lengths simultaneously, there is a power shortage issue due to insufficient allocation of transmission power, leading to unbalanced power distribution, where longer TTIs frequently use remaining power intended for shorter TTIs, causing inefficiencies.
Innovation Solution
A terminal is equipped with a receiving unit for downlink control information, a transmission power determination unit that reserves power for shorter TTIs within longer TTIs based on decoding completion before transmission, and a transmitting unit that allocates determined power for both TTIs, ensuring proper power distribution by prioritizing higher-priority signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TTIs with different TTI lengths are transmitted simultaneously, then communication flexibility and adaptability are improved, but transmission power shortage occurs leading to unbalanced power distribution
Solution Approach 1:
The patent applies preliminary action by determining transmission power for shorter TTIs before the actual transmission occurs. The base station calculates and notifies the terminal of the transmission power for shorter TTIs in advance, allowing the terminal to reserve appropriate power resources before simultaneous transmission begins, thereby preventing power shortage and unbalanced power distribution.
2Ease of operation
If transmission power is allocated without prior reservation, then power distribution simplicity is maintained, but power shortage occurs for shorter TTIs causing transmission failures
Solution Approach 1:
The patent implements preliminary action by having the base station determine and notify the terminal of transmission power for shorter TTIs before transmission. This advance determination ensures that power is reserved appropriately for shorter TTIs, preventing transmission failures while maintaining relatively simple power distribution through base station control.
3Device complexity
If power is allocated based on remaining power after longer TTI allocation, then allocation simplicity is maintained, but shorter TTIs suffer from insufficient power leading to unbalanced distribution
Solution Approach 1:
The patent applies preliminary action by determining transmission power for shorter TTIs before longer TTI transmission occurs. The base station calculates the required power for shorter TTIs in advance and notifies the terminal, ensuring that power is reserved appropriately before allocation, thereby achieving balanced power distribution without excessive complexity.
Data Source
AI summary
A DCI receiving unit receives downlink control information (DCI) indicative of allocation of an uplink (UL) signal of a first TTI (long TTI) or an uplink signal of a second TTI (sTTI) having a shorter TTI length than the first TTI; a transmission power determination unit determines transmission power of the uplink signal of the first TTI and transmission power of the uplink signal of the second TTI; and a transmitting unit transmits the uplink signal of the first TTI and the uplink signal of the second TTI by using the determined transmission power on the basis of the downlink control information. The transmission power determination unit reserves desired transmission power for the uplink signal of the second TTI in the first TTI in a case where decoding of the downlink control information indicative of allocation of the uplink signal of the second TTI to be transmitted within the first TTI (e.g., a subframe) is completed before start of transmission of the uplink signal of the first TTI.