P-CSCF IP Address Mapping for Emergency IMS Routing
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Solution Overview
Problem
In complex wireless networks, address recognition mismatches during network modifications can lead to delayed or failed emergency communications, such as 911 calls, due to unsynchronized IP address authorization across network components.
Innovation Solution
The P-CSCF overrides or configures unauthorized IP addresses for emergency communications by mapping or adding them to the set of authorized addresses, ensuring seamless routing to emergency services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network components are upgraded or equipment is replaced during network modifications, then network capabilities and configurations are improved, but address recognition mismatches occur between different network components leading to routing failures
Solution Approach 1:
The patent applies preliminary action by having the P-CSCF proactively detect IP address authorization status before emergency communications fail. The system checks whether a UE's IP address is authorized in the IMS network before routing attempts, and pre-configures or overrides unauthorized addresses to prevent routing failures. This advance detection and correction mechanism ensures emergency communications can be established without delay despite ongoing network modifications.
2Reliability
If IP addresses are propagated throughout the network during modifications, then address synchronization is improved, but communication delays occur during the propagation process
Solution Approach 1:
The patent employs an intermediary approach by introducing a detection and override mechanism at the P-CSCF that acts as a mediator between the core network and the IMS network. Rather than waiting for IP address propagation to complete throughout the entire network, the P-CSCF detects unauthorized IP addresses locally and overrides them with authorized addresses from its own authorization set. This intermediary action eliminates the need to wait for full network propagation, thereby avoiding communication delays while ensuring address synchronization.
3Measurement precision
If the P-CSCF checks IP address authorization for every communications request, then routing accuracy is improved, but processing overhead increases
Solution Approach 1:
The patent applies local quality by having the P-CSCF perform IP address authorization checks selectively rather than uniformly for all communications requests. The system focuses its verification efforts specifically on emergency communications requests, where routing accuracy is critical, while relying on standard authorization mechanisms for non-emergency traffic. This localized approach to verification maintains high routing accuracy for time-sensitive emergency calls without imposing excessive processing overhead on routine communications.
Data Source
AI summary
The authorized IP addresses configured at components in an IMS network may become out of sync with the authorized IP address provided by a core network to UEs. This may result in emergency communications being received at the IMS network from a UE using a core network-authorized address that is not recognized by the IMS network. An IMS component may be configured to map an unauthorized address from an emergency communications to an authorized address and route the communications within the IMS network using the authorized address. An IMS component may also, or instead, add an unauthorized address from an emergency communications to a listing of authorized addresses so that the communications can be routed normally. An IMS component may also, or instead, transmit an authorized address to the UE via a policy component for configuration at the UE so that subsequent emergency communications will be authorized.