Femto Node Signal Quality Measurement for Interference Avoidance
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Solution Overview
Problem
Unplanned deployment of low power base stations, such as femto nodes, often leads to interference among nearby stations due to the lack of coordinated signal quality management, resulting in suboptimal wireless coverage and service quality.
Innovation Solution
Implementing a method where low power base stations measure signal quality and compare it to a threshold, determining whether to transmit based on this measurement, either autonomously or through a centralized entity, to avoid interference and ensure fair access to transmission opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If low power base stations are deployed to provide robust wireless coverage, then wireless coverage is improved, but interference among nearby stations increases
Solution Approach 1:
The patent implements a feedback mechanism where low power base stations measure received signal quality from other stations and use this information to determine whether to transmit. This feedback loop allows stations to adjust their transmission behavior based on real-time interference conditions, resolving the contradiction between providing coverage and avoiding interference.
Solution Approach 2:
The patent changes the transmission parameter (transmission decision) based on the measured signal quality parameter. By dynamically adjusting whether to transmit or not based on the measured received signal quality from neighboring stations, the system optimizes the balance between coverage and interference avoidance.
2Productivity
If low power base stations transmit continuously to provide service, then service availability is improved, but interference to other stations increases
Solution Approach 1:
The patent implements periodic measurement and evaluation cycles where low power base stations periodically measure signal quality and determine transmission eligibility. This periodic action allows stations to provide service when conditions permit while avoiding continuous transmission that would cause interference.
Solution Approach 2:
The low power base stations autonomously measure signal quality and determine their own transmission eligibility without requiring external coordination. This self-service mechanism allows each station to independently manage its transmissions to avoid interfering with others while maintaining service availability.
3Object-generated harmful factors
If signal quality measurement is performed continuously, then interference avoidance is improved, but energy consumption increases
Solution Approach 1:
The patent specifies that signal quality measurement should be performed at predetermined time intervals rather than continuously. This periodic measurement approach maintains effective interference avoidance while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The patent performs signal quality measurement before making transmission decisions. This preliminary measurement action allows the system to assess interference conditions in advance and make informed transmission decisions, avoiding the need for continuous monitoring while still achieving effective interference avoidance.
Data Source
AI summary
Methods and apparatuses are provided that include deploying a femto node in a wireless network. The femto node can measure received signal quality upon initialization in a wireless network and/or according to a timing. The femto node can determine whether to communicate in the wireless network based on comparing the received signal quality to a threshold signal quality. The timing can be determined based on various factors to ensure fairness among femto nodes initializing in the wireless network. A centralized entity can be used to determine the timing and/or whether a femto node should communicate.