RAN Adapters for Cross-Network Voice Call Completion
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Solution Overview
Problem
Current communication systems face challenges in completing voice calls between different systems, such as Land Mobile Radio (LMR) and Long-Term Evolution (LTE), due to latency delays and non-optimal resource usage, leading to issues like missed calls and inefficiencies.
Innovation Solution
A cloud-based Call Processing System with RAN Adapters and Multi-Tenant Call Processing Services that enables seamless voice call processing across multiple systems and technologies, including LMR and LTE, by providing a fallback solution for standalone operation and real-time database updates, ensuring efficient resource management and access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a completely operational communication system is implemented, then system reliability is improved, but device complexity and financial cost increase
Solution Approach 1:
The system is segmented into a core cloud-based communication system and distributed RAN adapters that interface with different radio access networks (LMR, LTE, 5G). This segmentation allows the core system to remain relatively simple while distributing operational complexity to the adapter layer, resolving the contradiction between reliability and complexity.
Solution Approach 2:
RAN adapters serve as intermediary components between the core communication system and various radio access networks. These adapters handle the complexity of interfacing with different systems (LMR, LTE, 5G) while presenting a unified interface to the core system, thereby maintaining system reliability without increasing core system complexity.
2Adaptability or versatility
If inter-system calls are supported, then adaptability is improved, but latency delays increase
Solution Approach 1:
The system performs preliminary actions by pre-establishing call paths and pre-coordinating resource allocation between different communication systems before actual calls are made. The RAN adapters maintain connection states and pre-synchronize timing information, reducing latency when inter-system calls are initiated.
Solution Approach 2:
The system implements feedback mechanisms where RAN adapters continuously monitor call states and system conditions across different networks. This real-time feedback enables dynamic adjustment of call routing and resource allocation, minimizing latency delays during inter-system calls while maintaining adaptability.
3Reliability
If subscriber information is coordinated across systems, then reliability is improved, but information loss increases
Solution Approach 1:
The system creates and maintains local copies of subscriber information and call state data at each RAN adapter and in the core system. These copies are kept synchronized through selective updates rather than continuous synchronization, reducing information loss while maintaining connection reliability across distributed system components.
Data Source
AI summary
A method and system for completing a call between a first mobile device located at a first communication system and a second mobile device located at a second communication system is provided. A call initiation request including a request to complete a call with the second mobile device is received at a Radio Access Network (RAN) Adaptor (RA) from the first mobile device. The RA determines RAN-specific access parameters for the first mobile device and the second mobile device. The RA sends a call processing call initiation request including the RAN-specific access parameters and call initiation information for the first mobile device and the second mobile device to a cloud-based group call service. The RA establishes resources specific to the RAN in the RA. The resources include first resources at the first communication system and second resources at the second communication system. The call between the first mobile device and the second mobile device is completed using the first resources and the second resources.