Radio Base Station Carrier Selection for Unlicensed Band Interference
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Solution Overview
Problem
Current radio base stations and user terminals face challenges in efficiently utilizing unlicensed frequency bands for LTE systems, particularly in selecting optimal component carriers to minimize interference and ensure fair coexistence with other communication systems like Wi-Fi, due to limitations in interference power management and carrier aggregation techniques.
Innovation Solution
A radio base station and user terminal configuration that selects a target component carrier based on interference power levels and interference from same-type communication systems, using a controller to determine the optimal carrier for transmitting reference signals and instructing user terminals to perform sensing, thereby optimizing channel utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio base station transmits reference signals on all component carriers in an unlicensed frequency band, then the coverage and signal availability are improved, but the interference with other communication systems (Wi-Fi, Bluetooth) increases
Solution Approach 1:
The base station dynamically changes the transmission parameter by selecting different component carriers for reference signal transmission based on measured interference power levels. When interference exceeds a threshold, the system switches to an alternative component carrier, thereby adapting the transmission parameters to minimize harmful interference while maintaining signal availability.
Solution Approach 2:
The invention introduces an intermediary mechanism (interference measurement and carrier selection controller) that mediates between the reference signal transmission and other communication systems. By measuring interference power on each component carrier and selectively activating carriers below the threshold, the intermediary enables coexistence with Wi-Fi and Bluetooth while maintaining LTE service.
2Object-affected harmful factors
If the base station selects component carriers with low interference power for reference signal transmission, then the interference with other systems is reduced, but the complexity of carrier selection and interference management increases
Solution Approach 1:
The base station performs self-service by autonomously measuring interference power on each component carrier and automatically selecting appropriate carriers for reference signal transmission without external intervention. The system monitors its own transmission environment and adjusts carrier selection independently, reducing the need for complex external coordination mechanisms.
Solution Approach 2:
The invention implements a feedback loop where the base station continuously measures interference power on component carriers and uses this feedback information to make real-time carrier selection decisions. The interference measurement results feed back to the carrier selection controller, enabling dynamic adaptation to changing radio conditions while maintaining simple decision logic based on threshold comparison.
3Productivity
If multiple component carriers are used for carrier aggregation in unlicensed bands, then the network capacity and throughput are improved, but the difficulty of ensuring fair coexistence with other communication systems increases
Solution Approach 1:
The invention segments the unlicensed frequency band into multiple component carriers and applies interference measurement and selection independently to each segment. By dividing the frequency band into discrete carrier units that can be individually activated or deactivated, the system achieves fine-grained control over interference management while maintaining high network capacity through carrier aggregation of multiple selected carriers.
Data Source
AI summary
A radio base station according to an embodiment is a radio base station configured to use a specific frequency band which includes a plurality of component carriers having a predetermined bandwidth and which is allowed to be utilized by a plurality of network operators or a plurality of communication systems. The radio base station comprises: a controller configured to select, from among the plurality of component carriers, a target component carrier in which a reference signal used in the specific frequency band should be transmitted; and a transmitter configured to use the target component carrier to transmit the reference signal. The controller selects, as the target component carrier, a first component carrier that satisfies a first condition. The first condition is that an interference power amount falls below a predetermined threshold value.