Femtocell Transmission Power Adjustment for Interference and QoS
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Solution Overview
Problem
Femtocells face challenges in maintaining Quality of Service (QoS) and reducing energy consumption due to limited transmission power, which can lead to reduced transmission radius and interference issues with macrocells and other femtocells.
Innovation Solution
A transmission power setting apparatus and method for femtocells that computes a suitable transmission power range based on minimum permissible levels for QoS and maximum permissible levels for interference, adjusting power levels in response to requests from macrocells or neighboring femtocells, and controlling communication terminals to hand off or suspend operations when power exceeds permissible limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power of femtocell is set low to prevent interference with macrocell and other femtocells, then interference is reduced, but transmission radius is reduced and QoS cannot be satisfied
Solution Approach 1:
The patent implements dynamic transmission power adjustment by continuously monitoring interference levels from macrocells and other femtocells, and adapting the transmission power accordingly. The system transitions from static power settings to dynamic control, allowing the femtocell to optimize its power level in real-time based on current network conditions, thus preventing interference while maintaining QoS.
Solution Approach 2:
The patent employs feedback mechanisms where the femtocell receives information about interference levels and power settings from macrocells and neighboring femtocells. This feedback loop enables the system to adjust transmission power based on actual network conditions, ensuring that interference is minimized while QoS requirements are met through continuous optimization.
2Object-affected harmful factors
If transmission power of femtocell is set low to prevent interference, then interference is reduced, but energy consumption is not sufficiently reduced
Solution Approach 1:
The patent changes the power parameter dynamically based on network conditions rather than using a fixed low power setting. By adjusting the transmission power parameter according to actual interference levels and QoS requirements, the system achieves energy efficiency without unnecessarily limiting transmission capability, thus avoiding waste of energy while preventing interference.
Solution Approach 2:
The system transitions from static power configuration to dynamic power adjustment, allowing the femtocell to optimize energy consumption by setting transmission power only as high as necessary to meet QoS requirements while preventing interference. This dynamic approach ensures energy is not wasted on excessive power transmission.
3Reliability
If transmission power of femtocell is increased to maintain QoS, then QoS is satisfied, but interference with macrocell and other femtocells increases
Solution Approach 1:
The patent uses feedback from macrocells and neighboring femtocells about current interference levels and power settings to determine the appropriate transmission power. This feedback mechanism allows the system to increase power only when necessary to maintain QoS while immediately responding to conditions that would cause interference, thus balancing QoS satisfaction with interference prevention.
Solution Approach 2:
The system dynamically adjusts transmission power based on real-time network conditions rather than using fixed high power settings. This allows the femtocell to maintain QoS when necessary while minimizing interference by reducing power when network conditions permit, achieving a dynamic balance between these conflicting requirements.
4Reliability
If transmission power is dynamically adjusted to optimize QoS and energy consumption, then QoS is maintained and energy efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the femtocell autonomously adjusts its transmission power based on feedback information received from macrocells and neighboring femtocells. The system performs self-optimization without requiring complex centralized control or manual intervention, reducing the operational complexity while achieving dynamic QoS maintenance and energy efficiency.
Solution Approach 2:
The system performs preliminary actions by pre-configuring power adjustment ranges and thresholds based on QoS requirements and interference constraints. This preliminary setup simplifies the real-time decision-making process by providing pre-defined parameters for power adjustment, reducing the complexity of dynamic control while maintaining optimization capabilities.
Data Source
AI summary
An apparatus and method for setting a transmission power of a femtocell are provided. A range of a transmission power may be computed, and a minimum amount of power to be used by at least one communication terminal located within a cell coverage may be computed. Additionally, a suitable transmission power for communication may be determined using the computed range of the transmission power and the computed minimum amount of power.