Selective IMS Service Control for Non-Terrestrial Network Endpoints
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Solution Overview
Problem
Voice-centric devices automatically scan for alternative networks when voice services are not available, leading to a risk of no communication services in geographic locations where only non-terrestrial networks are available, which are resource-constrained.
Innovation Solution
Implement a policy configuration at the Session Border Gateway (SBG) or P-CSCF to reject voice call attempts from devices originating from specific restricted networks by checking the P-Access-Network-Information header and the 'Accept-contact' header, returning appropriate SIP error codes to prevent devices from scanning for alternate networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voice-centric devices automatically scan for alternative networks when voice services are not available, then devices can find alternative networks, but this leads to disconnection in geographic locations where only non-terrestrial networks are available
Solution Approach 1:
The patent applies preliminary anti-action by proactively blocking voice call attempts from non-terrestrial networks before devices can scan for alternative networks. The SBG or P-CSCF receives SIP invite messages, checks the P-Access-Network-Information header to identify non-terrestrial networks, and returns SIP error codes (e.g., 503) to reject voice calls. This preventive blocking stops the harmful scanning behavior before it can cause disconnection, ensuring devices remain connected to non-terrestrial networks for non-voice services only.
2Loss of energy
If non-terrestrial networks provide resource-constrained services, then network resources are conserved, but voice services cannot be reliably provided
Solution Approach 1:
The patent applies parameter changes by modifying the service parameters based on network type. The SBG or P-CSCF checks the P-Access-Network-Information header to identify non-terrestrial networks and dynamically adjusts service availability by blocking voice services (changing the service parameter from available to blocked) while allowing non-voice services to continue. This parameter modification ensures resource conservation in non-terrestrial networks by preventing voice call attempts that would consume scarce network resources.
3Loss of energy
If devices are blocked from voice calls on non-terrestrial networks, then network resources are conserved, but devices may lose communication capability
Solution Approach 1:
The patent applies local quality by differentiating service availability based on the specific network type and service type. The SBG or P-CSCF checks the P-Access-Network-Information header to identify non-terrestrial networks and applies selective blocking: voice services are blocked (changing quality for voice), while non-voice services like messaging remain available (maintaining quality for other services). This localized differentiation ensures that blocking voice calls conserves network resources without completely disabling device communication capability.
Data Source
AI summary
Methods and systems for restricting communication services over a network. The method includes detecting a Session Initiation Protocol (SIP) register message originating from a specific network Public Land Mobile Network (PLMN) that is included in a restricted PLMN list identified by a P-Access-Network-Information header (P-ANI). The method further includes implementing a policy to remove RCS and presence capability feature tags from a subsequent SIP register message. The lack of feature tags to Serving Call Session Control Function (S-CSCF) will prohibit triggering of Third Party Registration to different application servers.