Terminal Uplink Power Control for PUSCH and sPUSCH
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Solution Overview
Problem
Conventional transmit power control methods in communication systems, such as those using LTE, often fail to achieve efficient communication due to inefficiencies in power management and scheduling.
Innovation Solution
A terminal apparatus and method that include a receiver for Downlink Control Information (DCI) formats with Transmission Power Control (TPC) commands, allowing for the transmission of Physical Uplink Shared Channel (PUSCH) and shortened PUSCH (sPUSCH) with specific timing and power corrections based on the TPC commands, optimizing power control within identical uplink power control subframe sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmit power control methods are used, then power management is simplified, but communication efficiency deteriorates
Solution Approach 1:
The patent segments the power control process by introducing separate power control procedures for PUSCH and sPUSCH transmissions. When sPUSCH is detected in subframe m+B (where B<A), a separate power correction is applied specifically to sPUSCH rather than applying uniform power control to all uplink transmissions. This segmentation allows optimized power management for different transmission types, improving communication efficiency while maintaining manageable complexity through structured separation of control mechanisms.
2Productivity
If uniform power control is applied to all uplink transmissions, then control simplicity is maintained, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies local quality by implementing differential power control for different uplink transmission types. Specifically, when sPUSCH is transmitted in subframe m+B (earlier than PUSCH in subframe n+A), a second correction value from the TPC command is applied specifically to sPUSCH power, while the first correction value is applied to PUSCH power. This localized differentiation of power control parameters for different transmission types optimizes transmission efficiency without requiring complete redesign of the power control system.
3Measurement precision
If TPC commands are applied to both PUSCH and sPUSCH with same timing, then processing simplicity is maintained, but power control precision deteriorates
Solution Approach 1:
The patent implements dynamic power control by adapting the power correction application based on the timing relationship between PUSCH and sPUSCH transmissions. When sPUSCH transmission timing (m+B) is earlier than PUSCH transmission timing (n+A), the system dynamically applies the second correction value to sPUSCH power. This dynamic adaptation allows precise power control that responds to real-time transmission scheduling conditions, improving power control precision while maintaining processing simplicity through condition-based decision logic.
Data Source
AI summary
Included is an uplink power control unit configured not to apply a first correction value obtained from a TPC command included in a first DCI format to transmit power for a PUSCH and applies a second correction value obtained from a TPC command included in a second DCI format to transmit power for an sPUSCH, in a case that a subframe m is later than a subframe n, that a subframe m+B for transmitting the sPUSCH is earlier than a subframe n+A for transmitting the PUSCH, and that a transmission subframe for the PUSCH and a transmission subframe for the sPUSCH belong to an identical uplink power control subframe set in a first serving cell.