Radio Terminal MBMS Reception Using Enhanced Coverage Level Information
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Solution Overview
Problem
In mobile communication systems, especially for MBMS, existing technologies face challenges in providing reliable and efficient coverage for Machine Type Communication (MTC) and IoT services, particularly in terms of low cost, wide coverage, and low power consumption, especially when using enhanced coverage functions like repetition and power boosting.
Innovation Solution
The implementation of a radio terminal and base station configuration that utilizes an enhanced coverage function, where the base station transmits MBMS signals with level information to the radio terminal, allowing the terminal to perform cell reselection based on radio quality rankings to ensure continuous reception of MBMS signals, even in scenarios requiring enhanced coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If enhanced coverage function is used to extend base station coverage area, then coverage area is improved, but power consumption increases
Solution Approach 1:
The base station transmits MBMS signals using periodic repetition across multiple subframes instead of continuous transmission. The repetition factor indicates how many times the same signal is transmitted in sequence, allowing terminals with different reception capabilities to benefit from the coverage enhancement while the base station can adjust the repetition factor to balance coverage and power consumption.
Solution Approach 2:
The system dynamically adjusts the enhanced coverage level based on terminal capability and service requirements. The base station can configure different repetition factors for different MBMS services and different terminal types, allowing flexible optimization of coverage area versus power consumption according to actual network conditions and terminal capabilities.
2Reliability
If enhanced coverage function with repetition is applied, then reception reliability is improved, but transmission time increases
Solution Approach 1:
The system applies partial repetition based on terminal capability. Terminals with enhanced reception capability can decode MBMS signals with fewer repetitions, while terminals requiring enhanced coverage benefit from additional repetitions. The base station configures the repetition factor according to the terminal's enhanced coverage capability, avoiding unnecessary time consumption for terminals that don't require full repetition.
Solution Approach 2:
The repetition factor is changed dynamically based on terminal capability and service requirements. The base station can adjust the number of repetitions for different MBMS services and different terminal types, allowing optimization of reception reliability versus transmission time by selecting appropriate repetition levels rather than always using maximum repetition.
3Duration of action of stationary object
If cell reselection is performed frequently to maintain MBMS signal reception, then service continuity is improved, but power consumption increases
Solution Approach 1:
The terminal performs cell reselection in advance to find a suitable cell for MBMS reception before the current cell becomes unsuitable. By monitoring cell conditions and proactively reselecting cells that can provide MBMS service, the terminal avoids service interruption and reduces the frequency of emergency reselection operations, thereby lowering power consumption while maintaining service continuity.
Data Source
AI summary
A radio terminal according to one embodiment is a radio terminal for a mobile communication system supporting MBMS. The radio terminal comprises a receiver configured to receive level information from a base station; and a controller configured to perform a process of receiving an MBMS signal from the base station, based on the level information. The MBMS signal is transmitted from the base station using an enhanced coverage function for enhancing a coverage of the base station. The level information is information on an enhanced coverage level corresponding to the MBMS signal.