Mobile Station Interference Control via Attenuation Estimation
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Solution Overview
Problem
Current methods for controlling uplink interference in wireless communication networks are complex, costly, or penalize non-interfering mobile stations, failing to accurately identify and mitigate interference sources efficiently.
Innovation Solution
A method that involves selecting neighbor base stations, estimating signal attenuation levels, and calculating an interference level to inform mobile stations of a maximum transmitted signal strength, allowing them to adjust their transmission power and reduce interference without affecting other users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency planning is used to deploy base stations with different carrier frequencies, then interference between base stations is reduced, but deployment costs increase significantly
Solution Approach 1:
The patent changes the parameter of carrier frequency assignment dynamically. Instead of static frequency planning, the system allows base stations to operate on the same frequency and dynamically adjusts transmit power levels based on real-time interference conditions, eliminating the need for costly frequency separation while maintaining interference control
2Object-affected harmful factors
If interference cancellation technique is used with increased receiving antennas and complex signal processing, then interference from mobile stations is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the interference control function from the receiving end to the transmitting end. Instead of processing complex signals at the base station receiver, the mobile station itself calculates and adjusts its transmit power based on received signal strength measurements, simplifying the base station's receiving equipment while maintaining interference control effectiveness
3Object-affected harmful factors
If the number of users in a cell is limited to control average interference level, then interference on neighbor cells is reduced, but network capacity is penalized by restricting non-interfering users
Solution Approach 1:
The patent applies local quality control by individualizing interference management for each mobile station. Instead of applying a uniform user limit to all users in a cell, each mobile station's transmit power is independently adjusted based on its specific interference impact on neighboring cells, allowing non-interfering users to maintain full capacity while restricting only those causing problems
4Measurement precision
If complex statistical calculation with field intensity and bit error rate measurement is used, then interference state is accurately determined, but measurement time and algorithm convergence time increase
Solution Approach 1:
The patent uses simple, quick measurements of received signal strength (RSS) as a substitute for complex, time-consuming bit error rate measurements. The RSS measurements provide sufficient information for interference control decisions without requiring long measurement periods or complex statistical calculations, enabling rapid response to changing interference conditions
Data Source
AI summary
The present invention concerns a method for controlling the interference level generated by a mobile station comprising at least steps: selecting at least one neighbor base station; estimating a first attenuation value between the mobile station and a current base station, and at least a second attenuation value between the mobile station (MS) and the neighbor base station; estimating an interference level: I_level=BS0_RSS+L0−L wherein BS0_RSS is a first received signal strength at the base station, from the mobile station, L0 is the first attenuation value, and L is one second attenuation value estimated in preceding step, comparing the interference level to a reference interference level, and according to the result of the comparison, sending to the mobile station at least information relative to a maximum transmitted signal strength.