IMS Emergency Call Routing Using Relay Terminal Location
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Solution Overview
Problem
Emergency call failures occur when a remote terminal initiates an IMS emergency call through a relay terminal due to the inability of the network to obtain the remote terminal's location, leading to rejection by the E-CSCF.
Innovation Solution
A network-side device obtains an identifier of a relay terminal corresponding to the remote terminal and sends a second emergency call request carrying this identifier to a network element, enabling location information retrieval based on the relay terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a remote terminal initiates an IMS emergency call through a relay terminal, then network coverage is expanded to cell edge or outside coverage areas, but the emergency call fails because the network cannot obtain the remote terminal's location information
Solution Approach 1:
The patent uses the relay terminal as an intermediary to transmit location information. When a remote terminal cannot provide its own location, the relay terminal's location information is used as a substitute to enable the E-CSCF to proceed with emergency call handling. This mediator approach resolves the contradiction by allowing emergency calls to succeed in relay scenarios while maintaining expanded network coverage.
2Measurement precision
If the E-CSCF requires location information from the remote terminal, then emergency call security and routing accuracy are improved, but emergency call failure occurs when the remote terminal is connected via relay terminal without network registration
Solution Approach 1:
Instead of requiring the remote terminal to provide its own location information, the patent inverts the approach by using the relay terminal's location information. The E-CSCF is configured to accept location data from the relay terminal when the remote terminal cannot provide valid location information, thereby resolving the contradiction between location accuracy requirements and emergency call success in relay scenarios.
3Ease of operation
If the network uses relay terminals to provide service data forwarding, then connectivity for remote terminals is improved, but the remote terminal cannot be registered with the 4G or 5G network, causing location retrieval failure
Solution Approach 1:
The relay terminal serves as an intermediary that bridges the gap between the remote terminal and the network. By using the relay terminal's registered location information to represent the remote terminal's location, the system maintains both the connectivity benefit of relay terminals and the location information required for emergency call handling.
Data Source
AI summary
An emergency call handling method, includes: receiving, by a first network element, a first emergency call request sent by a remote terminal; obtaining, by the first network element, an identifier of a relay terminal corresponding to the remote terminal; and sending, by the first network element, a second emergency call request to a second network element, where the second emergency call request carries the identifier of the relay terminal.