UE Power Control for Cell Edge Signaling Reliability
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Solution Overview
Problem
In cellular mobile communication systems, conventional power control methods often reduce transmission power at the cell edge to mitigate interference, which can obstruct crucial control signaling like handover and buffer reporting, leading to increased interference and call drop rates due to inadequate signal strength.
Innovation Solution
The user equipment employs different transmission power control mechanisms for various signals, disregarding neighboring cell power control information for critical control signals like handover and RRC messages, ensuring they reach the serving cell base station, while other signals are adjusted based on neighboring cell interference notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If transmission power is reduced at cell edge to mitigate interference, then interference with neighboring cells is reduced, but control signaling reliability deteriorates
Solution Approach 1:
The patent applies different power control strategies to different types of signals. Control signals (handover, buffer reporting) are transmitted with higher power disregarding neighboring cell interference, while data signals are subject to normal interference-based power control. This local differentiation ensures critical signaling reliability while maintaining overall interference management.
2Reliability
If transmission power is increased for control signals, then control signaling reliability is improved, but interference with neighboring cells increases
Solution Approach 1:
The patent segments the uplink transmission into two categories: control signals and data signals. Each category is subject to different power control rules. Control signals use power control that disregards neighboring cell interference information, while data signals use power control that considers neighboring cell interference. This segmentation allows the system to prioritize control signaling reliability without excessively increasing overall interference.
3Device complexity
If uniform power control is applied to all signals, then power control simplicity is maintained, but critical control signals may be lost due to power reduction
Solution Approach 1:
The patent implements local quality differentiation in power control by applying distinct power control mechanisms to different signal types. Control signals receive enhanced power control treatment with higher transmission power regardless of neighboring cell interference, while data signals follow standard interference-based power control. This approach ensures critical control signal delivery while maintaining reasonable overall system complexity.
Data Source
AI summary
A user equipment is provided for a telecommunications system comprising at least a first radio base station. The user equipment controls its transmission power to a first value for a first set of one or more signals sent over a physical channel between the user equipment and the first radio base station, and to a second value for a second set of one or more signals sent over the physical channel between the user equipment and the first radio base station. The first value and said second value are different. In alternative embodiments, the second set of signals are transmitted taking into account information from the serving cell and a neighboring cell, while the first set of signals are transmitted taking into account information from the serving cell only.