Wireless PBX Trunk Sharing Through Dynamic SIM-to-Radio Mapping
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Solution Overview
Problem
Businesses require multiple phone lines for different employees or departments, but traditional PBX systems with limited trunk groups often lead to underutilization of lines due to concurrent usage limitations, resulting in inefficient resource allocation and higher costs.
Innovation Solution
A Multi-SIM Active/Standby (MSMA/S) device manages a plurality of SIMs and radios, allowing a limited number of concurrent calls by using a hunt group algorithm and switching to WiFi calling when maximum radio usage is reached, enabling cost-effective management of wireless connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a limited number of wireless channels are allocated to a group of phone numbers, then cost is reduced, but call setup success rate deteriorates when maximum concurrent calls are reached
Solution Approach 1:
The patent introduces WiFi as an intermediary communication path between the wireless PBX and the external network. When all wireless channels are occupied, overflow calls are redirected through WiFi gateway to establish alternative communication paths, thereby maintaining call setup success rate while using a limited number of wireless channels.
2Device complexity
If multiple SIMs are supported with a limited number of radios, then device complexity is reduced, but call handling capability deteriorates
Solution Approach 1:
The patent implements dynamic SIM-to-radio mapping where the association between SIM cards and physical radios is not fixed but can be dynamically reassigned. When a radio becomes available, the system dynamically assigns it to handle new calls from different SIMs, enabling a limited number of radios to serve multiple SIMs effectively without increasing device complexity.
Solution Approach 2:
Each radio in the system is designed to be universal and can serve any SIM card in the group, rather than being dedicated to a specific SIM. This multi-functionality allows the limited number of radios to be flexibly allocated across multiple SIMs based on real-time demand, maximizing concurrent call handling capability without increasing the number of physical radios.
3Quantity of substance
If traditional PBX with limited trunk group is used, then cost is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent ensures continuous utilization of wireless channels by implementing a hunt group algorithm that continuously directs incoming calls to available channels. When channels are freed up, the system immediately reallocates them to new calls, eliminating idle time and ensuring continuous useful action, thereby improving line utilization efficiency with a limited number of trunk lines.
Data Source
AI summary
Aspects of the subject disclosure may include, for example, facilitating communication sessions such as voice calls over a plurality of radios of the wireless PBX via one or more carriers, where the wireless PBX includes a plurality of Subscriber Identity Modules (SIMs) and a plurality of radios, wherein there are a maximum number of concurrent communication sessions permitted that are fewer than a number of the plurality of SIMs; determining that the maximum number of concurrent communication sessions has been reached; and responsive to reaching the maximum number of concurrent communication sessions, facilitating establishing an outgoing voice call via a WiFi connection. Other embodiments are disclosed.