Portable Terminal Network Switching for Barred LTE Calls
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Solution Overview
Problem
In densely populated areas, the LTE network base stations experience overload, leading to call barring in both data and voice services due to their inability to support circuit-switched voice calls, resulting in users being unable to originate calls from their portable terminals.
Innovation Solution
A method and apparatus that allow a portable terminal to switch to a second network (such as a 2G or 3G network) if call originating is barred in the LTE network, by receiving a message barring call originating from the base station, storing system information block messages, selecting a cell with a higher power level, and switching communication modes to originate the call in the selected cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LTE base station processes large amounts of data calls in densely populated areas, then network capacity is improved, but call originating service becomes unavailable due to overload
Solution Approach 1:
The patent segments the communication network into multiple types (LTE network and second network such as 2G/3G networks). When the LTE network becomes overloaded and bars call originating, the portable terminal automatically switches to the second network for voice calls, thereby maintaining service availability while allowing the LTE network to focus on data traffic handling.
2Device complexity
If LTE network supports only packet switching, then network simplicity is improved, but voice call capability is lost
Solution Approach 1:
The portable terminal is designed with multi-functionality to support both packet-switched LTE networks and circuit-switched second networks. The terminal can automatically select the appropriate network type based on service requirements and network status, enabling it to perform both data calls and voice calls across different network infrastructures.
3Power
If call barring message is implemented, then network load control is improved, but user convenience deteriorates
Solution Approach 1:
The portable terminal implements automatic self-service functionality by monitoring call barring messages from the LTE network and autonomously switching to the second network for voice calls. This eliminates the need for manual user intervention, as the terminal automatically detects network conditions and performs the necessary network switching to maintain service availability.
4Adaptability or versatility
If base station processes both data and voice calls, then service versatility is improved, but base station overload increases
Solution Approach 1:
The patent segments traffic handling between different networks: LTE network for data calls and second network for voice calls. This segmentation allows the LTE base station to focus exclusively on data traffic, reducing its load, while voice traffic is handled by the second network, thereby maintaining overall service versatility without overloading the LTE infrastructure.
Data Source
AI summary
A portable terminal and a method for originating a call through a substituted network when originating a call is barred due to overload of a first network is disclosed herein. A call may be originated by automatically switching the communication mode of the portable terminal from the first network such as an LTE network to a second network such as a 3G network or a 2G network, when originating a call is barred in the first network. The information of the cell of the second network is searched from a second network database stored in advance, which allows the time to search for a cell and time to register in the second network decrease. The searched cell with the highest power level may be selected and the call is originated through the selected cell of the second network.