Terminal Power Headroom Reporting Threshold Mechanism
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Solution Overview
Problem
In mobile communication systems, the frequent transmission of power headroom information is inefficient, especially when the base station allocates fewer transmission resources, and abrupt changes in path loss or power headroom may not require continuous reporting.
Innovation Solution
A method and apparatus that reduce the frequency of power headroom information transmission by using two conditions: Condition 1, which checks for changes in path loss or Channel Quality Information, and Condition 2, which considers the amount of data stored in the terminal, to determine when power headroom information should be generated and transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power headroom information is transmitted frequently to ensure accurate scheduling information, then scheduling accuracy is improved, but uplink transmission resources are wasted
Solution Approach 1:
The patent changes the transmission parameter from frequent fixed-interval reporting to event-triggered reporting based on path loss change thresholds. The terminal monitors path loss variations and only transmits power headroom information when changes exceed a predetermined threshold, thereby adapting the transmission frequency to actual channel conditions and reducing unnecessary resource consumption.
Solution Approach 2:
The patent implements dynamic transmission behavior where the terminal adaptively determines whether to report power headroom information based on real-time path loss changes. Instead of static periodic reporting, the system dynamically activates transmission only when channel conditions warrant it, optimizing the balance between scheduling accuracy and resource efficiency.
2Productivity
If power headroom information is transmitted only when necessary to conserve resources, then resource efficiency is improved, but scheduling accuracy may deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the terminal continuously monitors path loss changes and compares them against predetermined thresholds. This feedback loop ensures that power headroom information is transmitted whenever channel conditions change significantly, maintaining scheduling accuracy by providing timely updates only when necessary, thus avoiding both excessive transmission and insufficient reporting.
Data Source
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AI summary
A method for transmitting power headroom information by a terminal in a mobile communication system, the method comprising: receiving, by the terminal, information on an allocated uplink transmission resource and information on a threshold; determining whether a path loss has changed more than the threshold after transmitting last power headroom information, when the terminal has the allocated uplink transmission resource; if the path loss has changed more than the threshold when the terminal has the allocated uplink transmission resource, determining a transmission of the power headroom information; and transmitting an uplink packet including the power headroom information using the allocated uplink transmission resource, wherein the power headroom information is obtained based on a difference between a maximum transmission power of the terminal and a transmission power of the terminal, and wherein the transmission power of the terminal is obtained using the path loss and information related to a Modulation Coding Scheme, MCS.