Radio Base Station Measurement Indication for User Terminal Load Reduction
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Solution Overview
Problem
In radio communication systems with multiple component carriers in small cells within a macro cell, user terminals face increased measurement loads and information reporting requirements, leading to potential communication interruptions and decreased throughput.
Innovation Solution
A radio base station transmits measurement indication information to user terminals, allowing them to measure and report the received power of a specific component carrier, assuming similar power levels for other carriers, thereby reducing the measurement load and information reporting burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user terminal measures and reports the received quality of measurement signals for all component carriers in small cells, then the network can make accurate handover decisions, but the measurement load and information reporting amount increase in the user terminal
Solution Approach 1:
The patent extracts only the necessary measurement parameter (received power of a specific component carrier) from the complete set of measurements (received quality of all component carriers). The network side then calculates the received quality for all carriers based on this extracted power measurement, thereby reducing the user terminal's measurement load while maintaining measurement accuracy for handover decisions
Solution Approach 2:
The received power measurement of a single component carrier serves multiple functions: it directly indicates the signal strength for that carrier, and simultaneously serves as a basis for the network to calculate received quality metrics for all component carriers in the small cell. This multi-functional use of a single measurement reduces overall measurement requirements
2Measurement precision
If the user terminal reports the received quality of measurement signals for all component carriers, then the network can make accurate handover decisions, but the amount of information to report increases in the user terminal
Solution Approach 1:
The patent extracts only the essential information (received power of one specific component carrier) from the complete information set (received quality of all component carriers). This extracted power measurement is transmitted to the network, which then derives all necessary quality metrics, thereby minimizing the information reporting burden on the user terminal
Solution Approach 2:
The network creates copies of the power measurement information for all component carriers by calculating received quality metrics based on the single reported power value. This allows the network to have complete quality information for all carriers without requiring the user terminal to measure and report each one individually
3Loss of information
If the user terminal performs measurements on all component carriers in small cells, then comprehensive measurement data is obtained, but communication interruptions increase and throughput decreases
Solution Approach 1:
The patent extracts the critical power measurement from a reduced set of measurements (one component carrier instead of all carriers). This extraction approach maintains sufficient measurement data for handover decisions while reducing the time required for measurements, thereby minimizing communication interruptions and maintaining higher throughput
Solution Approach 2:
The patent applies partial action by measuring only one specific component carrier's received power instead of performing exhaustive measurements on all component carriers. This partial measurement approach provides sufficient information for network decisions while reducing measurement time and avoiding excessive impact on communication throughput
Data Source
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AI summary
The present invention is designed so that, in a radio communication system in which a plurality of component carriers (CCs) are used in each small cell within a macro cell, the load of measurements, the amount of information to report and so on in user terminals are reduced. The macro base station of the present invention transmits, to a user terminal, measurement indication information that includes a measurement indication for the received power of a measurement signal of a specific CC in each small cell, and receives, from the user terminal, a measurement report that includes the received power of the measurement signal of the specific CC. Also, the macro base station calculates the received quality of the measurement signals of the plurality of CCs based on the received power of the measurement signal of the specific CC.