Terminal Power Headroom Calculation via Subframe Set Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a lack of specific procedures described for terminal apparatuses to perform transmission power processing, including transmission power control and Power Headroom Reporting (PHR), in radio communication systems, particularly in LTE environments.
Innovation Solution
The terminal apparatus and base station apparatus are configured to use higher layer signaling to exchange information about subframe sets, allowing the terminal apparatus to calculate power headroom using different sets of parameters based on the subframe type, enabling efficient transmission power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal apparatus uses a unified set of parameters for power headroom calculation across all subframes, then the calculation procedure is simple, but the accuracy of power headroom reporting deteriorates due to inability to account for different subframe types (flexible vs. non-flexible)
Solution Approach 1:
The patent segments the subframes into different sets (first subframe set and second subframe set) based on their flexibility characteristics. The terminal apparatus is configured to use different parameter sets for power headroom calculation depending on which subframe set the current subframe belongs to. This segmentation allows accurate power headroom reporting for flexible subframes while maintaining simplicity for non-flexible subframes.
Solution Approach 2:
The patent introduces dynamic configuration where the terminal apparatus can be instructed to use different parameter sets based on the subframe type. The base station can dynamically indicate whether a subframe is flexible or non-flexible, and the terminal adjusts its power headroom calculation parameters accordingly. This dynamic adaptation enables accurate power management across varying network conditions.
2Reliability
If the terminal apparatus performs transmission power control without specific procedure guidance, then the implementation is flexible, but the reliability of transmission power management deteriorates due to lack of standardized processing procedures
Solution Approach 1:
The patent specifies parameter changes that the terminal apparatus must make when performing transmission power control. Different parameter sets are defined for different subframe types, and the terminal is instructed to select the appropriate parameters based on the subframe configuration. This standardized parameter selection procedure enhances reliability while maintaining manageable complexity through clear parameter definitions.
3Measurement precision
If the base station apparatus does not provide subframe set information through higher layer signaling, then the signaling overhead is reduced, but the terminal apparatus cannot accurately determine which parameter set to use for power headroom calculation
Solution Approach 1:
The patent uses higher layer signaling as an intermediary mechanism to convey subframe type information from the base station to the terminal apparatus. This signaling mechanism provides the necessary information about whether a subframe is flexible or non-flexible, enabling the terminal to select the correct parameter set without requiring complex direct configuration mechanisms.
Data Source
AI summary
There is provided a terminal apparatus configured to communicate with a base station apparatus. The terminal apparatus includes a reception unit configured to receive information for configuring a plurality of subframe sets and a parameter for each of the plurality of subframe sets from the base station apparatus, and a transmission unit configured to report power headroom calculated based on the parameter for a subframe set to which a subframe in which power headroom reporting is performed belongs, to the base station apparatus in the subframe. Thus, the terminal apparatus can efficiently perform a process related to a transmission power.