Home Base Station Interference Control via Network Device Selection
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Solution Overview
Problem
Current methods are inefficient in identifying and reducing downlink interference from home cells to macro user equipment, as they require complex frameworks and excessive time to select the source of interference among multiple home cells.
Innovation Solution
A mobile communication system that includes a network device capable of selecting and reconfiguring home base stations based on radio resource information and uplink interference, allowing for the adjustment of transmission power to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RNC instructs the HNB cell to adjust transmission power based on interference reports from MUE, then downlink communication quality of MUE is improved, but the complexity of identifying the source home cell increases significantly
Solution Approach 1:
The patent implements a feedback mechanism where the MUE measures downlink interference from home cells and reports this information to the RNC. The RNC then uses this feedback to identify the interfering home cell by comparing reported interference characteristics with stored configuration information, and instructs the identified HNB to adjust its transmission power. This closed-loop feedback system resolves the contradiction by providing a structured method to handle interference identification complexity while maintaining communication quality improvement.
Solution Approach 2:
The RNC acts as an intermediary between the MUE and the HNB cells. Instead of directly identifying the interfering home cell through complex MUE measurements or requiring direct MUE-HNB communication, the RNC receives interference reports from the MUE, processes this information against stored configuration data, and mediates the identification process by determining which HNB is the interference source. This intermediary role simplifies the overall system complexity while maintaining effective interference management.
2Ease of operation
If the system uses a simple interference report mechanism from MUE to RNC, then the operation simplicity is improved, but the precision of identifying the interfering home cell deteriorates
Solution Approach 1:
The system performs preliminary actions by having the RNC store configuration information about multiple home cells (including cell identities, frequency information, and other characteristics) before interference occurs. When the MUE reports interference, the RNC can immediately compare the reported interference characteristics against this pre-stored information to accurately identify the interfering home cell. This preliminary preparation maintains operational simplicity while ensuring precise identification.
Solution Approach 2:
The patent replaces complex physical measurement and identification mechanisms with information processing. Instead of requiring the MUE to physically track or identify the interfering cell through complex radio measurements, the system substitutes this with an information-based approach: the MUE reports interference characteristics, and the RNC uses stored configuration data to identify the source. This substitution maintains ease of operation while achieving precise identification through data comparison rather than physical measurement.
Data Source
AI summary
In order to reduce interference to a macro user equipment by easily selecting a home cell serving as the source of interference to the macro user equipment and adjusting a transmission power or the like, a plurality of base stations (10—1 to 10—3) that constitute a mobile communication system (1) respectively form cells (11—1 to 11—3) for radio communication. A network device (50) causes candidates for a first base station that should perform reconfiguration of the cell among the base stations (10—1 to 10—3) to execute the reconfiguration. The candidates for the first base station are selected based on radio resources used by each of the base stations (10—1 to 10—3) at the time of forming the cells (11—1 to 11—3). Alternatively, the first base station is selected based on uplink interference to each of the base stations (10—1 to 10—3).