Terminal Power Headroom Calculation for Uplink Control
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Solution Overview
Problem
There is a lack of specific procedures described for terminal apparatuses to perform transmission power processing, particularly for transmission power control and Power Headroom Reporting (PHR) in radio communication systems, such as LTE.
Innovation Solution
The terminal apparatus and base station apparatus are configured to calculate and manage type 2 power headroom using specific parameters for transmission in physical uplink control and shared channels, and adjust transmissions based on uplink-downlink configurations, enabling efficient power control and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal apparatus uses different parameters for power headroom calculation based on subframe set membership, then the power control accuracy is improved, but the processing complexity increases
Solution Approach 1:
The patent divides the uplink subframes into two distinct sets (first subframe set and second subframe set) with different power control parameter configurations. This segmentation allows the terminal to apply appropriate parameters for each subframe type, improving power headroom calculation accuracy while managing complexity through structured classification
Solution Approach 2:
Different power control parameters (first parameter for PUSCH in first subframe set, second parameter for PUSCH in second subframe set) are assigned to different subframe sets based on their specific characteristics. This local differentiation ensures optimal power control for each subframe type without requiring complete reconfiguration of the power control system
2Adaptability or versatility
If the terminal apparatus maintains multiple parameter sets for different subframe sets, then the adaptability to dynamic TDD is improved, but the information management complexity increases
Solution Approach 1:
The patent enables dynamic adaptation to TDD configurations by allowing the base station to flexibly assign subframes to different sets based on traffic conditions. The terminal apparatus adapts its power control parameters according to the dynamically changing subframe set assignments, maintaining versatility while following clear signaling from the base station
Solution Approach 2:
The base station provides higher layer signaling to indicate which subframes belong to which set, creating a feedback mechanism that guides the terminal's parameter selection. This feedback loop allows the system to adapt to changing conditions while keeping the terminal's decision-making process straightforward
3Reliability
If the terminal apparatus calculates type 2 power headroom using set-specific parameters, then the transmission reliability is improved, but the calculation time increases
Solution Approach 1:
The terminal apparatus pre-configures itself with multiple parameter sets (first parameter, second parameter, third parameter) corresponding to different subframe sets. When a power headroom calculation is needed, the terminal can immediately select the appropriate pre-configured parameters based on the current subframe set, avoiding time-consuming parameter search or derivation while maintaining reliable calculations
Data Source
AI summary
There is provided a terminal apparatus configured to: receive information indicating subframes of first and second subframe sets by using a higher layer signaling. The terminal apparatus is configured to, in a case that a power headroom for a predetermined subframe is calculated: calculate the power headroom by using a third parameter related to transmission power control for transmission in a physical uplink control channel and a first parameter related to transmission power control for transmission in a physical uplink shared channel in the predetermined subframe in a case that the predetermined subframe belongs to the first subframe set; and calculate the power headroom by using the third parameter and a second parameter related to transmission power control in a physical uplink shared channel in the predetermined subframe in a case that the predetermined subframe belongs to the second subframe set. Thus, it is possible to efficiently perform a process related to a transmission power.