RAN System Information Block for Emergency Network Selection
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Solution Overview
Problem
In a multi-operator core network arrangement, user equipment (UE) faces challenges in determining which core network supports emergency services, leading to inefficient resource consumption and repeated attempts to attach to networks that do not support emergency services, causing unnecessary utilization of resources during emergency calls.
Innovation Solution
A radio access network (RAN) device generates a System Information Block (SIB) with identifiers and indicators of core networks that support emergency services, enabling the UE to select a suitable network and prioritize service types, thereby directing emergency calls to supported networks and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RAN device shares multiple core networks without providing emergency service indicators, then network resource utilization is improved, but the UE cannot determine which core network supports emergency services, leading to repeated attachment attempts and resource waste
Solution Approach 1:
The RAN device performs preliminary action by including emergency service support indicators in system information blocks before the UE attempts to attach. This allows the UE to identify supported core networks in advance, preventing repeated attachment attempts to unsupported networks and ensuring reliable emergency service connectivity.
2Speed
If the UE attempts to attach to any available core network without emergency service indicators, then network access speed is improved, but resource consumption increases due to repeated attachment attempts to networks that do not support emergency services
Solution Approach 1:
The system performs preliminary action by providing emergency service support indicators in system information blocks before attachment attempts. This enables the UE to identify suitable core networks in advance, achieving both fast attachment and efficient resource utilization by avoiding repeated failed attempts.
3Reliability
If the RAN device provides detailed information about core network emergency service support, then the UE can select appropriate networks for emergency calls, but the system information complexity increases
Solution Approach 1:
The RAN device applies local quality by providing differentiated information in system information blocks - including emergency service support indicators specifically for core networks that may support emergency services. This targeted approach provides necessary information for reliable emergency call setup while minimizing overall system information complexity.
Data Source
AI summary
A network device may receive network data identifying core networks supported by the network device and emergency service data identifying one or more of the core networks that support emergency services. The network device may generate, based on the network data and the emergency service data, system information that includes identifiers of the core networks and indicators of whether the core networks support emergency services. The network device may provide the system information to a user equipment to inform the user equipment about which of the core networks support emergency services.