Uplink Interference Identification in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous networks, low-power base stations face challenges in identifying uplink interfering user terminals, as they cannot detect or differentiate the interfering users, and high-power base stations are also unaware of the interference caused by user terminals to low-power stations.
Innovation Solution
A communication control method that involves transmitting interference information from low-power base stations to high-power base stations, allowing them to change the radio environment around the coverage area by controlling transmission directivity or power, and identifying interfering user terminals based on reported radio environment information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low-power base station receives uplink interference from user terminals, then the interference can be detected, but the interfering user terminal cannot be identified
Solution Approach 1:
The patent introduces the high-power base station as an intermediary that collects radio environment information from multiple user terminals and processes this information to identify the interfering terminal. The low-power base station cannot directly identify the interferer, but through the intermediary's aggregation and analysis of measurement data from all connected terminals, the interfering user terminal can be pinpointed by analyzing which terminal's reported radio environment matches the interference pattern detected by the low-power base station.
2Ease of operation
If a high-power base station and connected user terminals are unaware of uplink interference to low-power base stations, then normal communication continues, but interference mitigation cannot be performed
Solution Approach 1:
The patent establishes a feedback mechanism where the low-power base station reports detected interference information to the high-power base station, and the high-power base station collects radio environment information from its connected user terminals. This feedback loop enables the high-power base station to identify which of its connected terminals is causing interference to the low-power base station, allowing for targeted interference mitigation while maintaining normal operation for non-interfering terminals.
3Productivity
If user terminals transmit uplink signals in heterogeneous networks, then communication service is provided, but uplink interference occurs at low-power base stations
Solution Approach 1:
The patent extracts the interfering element (specific user terminal) from the overall system by identifying and isolating the source of interference. Through the feedback mechanism and radio environment information analysis, the high-power base station can identify which specific user terminal is causing harm to the low-power base station, enabling targeted handover or power control actions to remove the interfering element while preserving normal communication for other terminals.
Data Source
AI summary
A communication control method in a mobile communication system having a first base station and a second base station having a smaller coverage area than the first base station, comprises: a step A of transmitting information indicating interference in uplink detected by the second base station, from the second base station to the first base station; a step B of performing processing by the first base station and/or the second base station to change a radio environment around the boundary of a coverage area of the second base station; and a step C of identifying an interfering user terminal in the uplink by the first base station, from first user terminals being connected with the first base station, based on radio environment information reported by the first user terminals.