IMS Emergency Call Relay Identification for Remote UE Location
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Solution Overview
Problem
Emergency call failures occur when a remote terminal initiates an IP multimedia subsystem (IMS) emergency call through a relay terminal due to the inability of the location retrieval function to obtain the remote terminal's location, causing the emergency call session control function to reject the call.
Innovation Solution
A network-side device obtains an identifier of a relay terminal corresponding to the remote terminal and sends an emergency call request carrying this identifier to another network element, enabling the retrieval of location information based on the relay terminal for successful emergency call handling.
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 location retrieval function cannot obtain the remote terminal's location information causing emergency call failure
Solution Approach 1:
The patent uses the relay terminal as an intermediary to bridge the communication gap between the remote terminal and the network. When the remote terminal cannot be directly accessed by the network for location retrieval, the relay terminal acts as a mediator that forwards emergency call requests and carries location information between the remote terminal and network elements like E-CSCF and LRF, enabling successful emergency calls while maintaining expanded network coverage
Solution Approach 2:
The patent implements preliminary action by having the relay terminal obtain and store location information of the remote terminal before the emergency call is initiated. The relay terminal proactively retrieves location data through location services and makes it available in advance, so when an emergency call occurs, the location information is already prepared and can be immediately provided to the E-CSCF, preventing call failure due to missing location data
Data Source
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AI summary
The present application belongs to the technical field of wireless communications. Disclosed are a method and apparatus for processing an emergency call, and a network-side device. The method comprises: a first network element receiving a first emergency call request which is sent by a remote user equipment; the first network element acquiring an identifier of a relay user equipment corresponding to the remote user equipment; and the first network element sending a second emergency call request to a second network element, wherein the second emergency call request carries the identifier of the relay user equipment.