Terminal Power Headroom Calculation Using Subframe Set Segmentation
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Solution Overview
Problem
There is a lack of specific procedures described for terminal apparatuses to perform transmission power processing, particularly in executing transmission power control and Power Headroom Reporting (PHR) in radio communication systems.
Innovation Solution
The terminal apparatus and base station apparatus are configured to receive and transmit information about subframe sets using higher-layer signaling, allowing for the calculation of power headroom based on different sets of parameters depending on whether transmission occurs in specific subframes, and adjusting transmission accordingly based on uplink-downlink configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal apparatus uses a single set of parameters for power headroom calculation, then the processing is simple, but it cannot accurately reflect transmission power characteristics in different subframe sets with different uplink-downlink configurations
Solution Approach 1:
The patent segments the subframes into two distinct sets (first subframe set and second subframe set) with different uplink-downlink configurations. Each set uses its own dedicated parameters for power headroom calculation, allowing accurate reflection of transmission power characteristics specific to each subframe type without requiring complex dynamic adjustments.
Solution Approach 2:
The patent applies local quality by assigning different parameter sets to different subframe sets. The first set of parameters is used for subframes in the first subframe set, while the second set of parameters is used for subframes in the second subframe set. This ensures that each local context (subframe set) uses parameters optimized for its specific characteristics.
2Productivity
If the terminal apparatus dynamically adjusts transmission power based on different subframe sets, then the transmission efficiency is improved, but the processing overhead and complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring two distinct sets of parameters before transmission occurs. The terminal apparatus is provided with the first set of parameters for the first subframe set and the second set of parameters for the second subframe set in advance. This allows efficient transmission power adjustment without requiring complex real-time calculations during transmission.
Solution Approach 2:
The patent applies parameter changes by switching between different parameter sets based on the subframe set being used. The terminal apparatus selects the appropriate parameter set (first or second) according to which subframe set the current subframe belongs to, enabling dynamic adaptation to different uplink-downlink configurations while maintaining manageable processing complexity.
3Loss of information
If the terminal apparatus reports power headroom for all subframes, then complete information is provided to the base station, but the signaling overhead increases
Solution Approach 1:
The patent segments power headroom reporting into two separate reporting mechanisms corresponding to the two subframe sets. The terminal apparatus can report power headroom separately for the first subframe set using the first set of parameters and for the second subframe set using the second set of parameters. This segmentation allows the base station to receive comprehensive information while the terminal can selectively report based on which subframe set is relevant.
Data Source
AI summary
There is provided a terminal apparatus configured to communicate with a base station apparatus. The terminal apparatus is configured to: receive information indicating a subframe of a first subframe set and a subframe of a second subframe set by using a higher layer signaling. The terminal apparatus is configured to, in a case that a power headroom for a predetermined subframe for a predetermined serving cell is calculated: calculate the power headroom based on a reference format by using a first set of parameters in a case that transmission in a physical uplink shared channel is not performed in the predetermined subframe for the predetermined serving cell, and the predetermined subframe belongs to the first subframe set; and calculate the power headroom based on the reference format by using a second set of parameters in a case that the transmission in the physical uplink shared channel is not performed in the predetermined subframe for the predetermined serving cell, and the predetermined subframe belongs to the second subframe set.