UE Emergency Access via NG-RAN Satellite Cells
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Solution Overview
Problem
Existing systems face delays and limitations in establishing seamless connectivity for emergency services when a User Equipment (UE) moves between Terrestrial Network (TN) and Non-Terrestrial Network (NTN) coverage areas, leading to compromised user safety due to delayed connections and inability to access emergency services in certain conditions.
Innovation Solution
A method and system for handling emergency services at a UE via NG-RAN satellite cells, allowing access to PLMNs not allowed in the current location, maintaining NAS signaling connections, and enabling parallel signaling requests for emergency services, even during regular service establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows conventional procedures for service request and registration, then the system maintains proper protocol compliance and network management, but the UE experiences delays in accessing emergency services when moving between TN and NTN coverage areas
Solution Approach 1:
The system performs preliminary actions by pre-establishing NAS signaling connections and maintaining registration states before emergency services are needed. When the UE enters an NTN coverage area, the connection is already prepared, allowing immediate emergency service access without waiting for conventional registration procedures to complete.
Solution Approach 2:
The patent allows the UE to skip certain conventional registration steps and directly access emergency services when in NTN coverage. The service request procedure is expedited by bypassing normal registration requirements, rushing through the connection establishment process to provide emergency services immediately.
2Reliability
If the UE restricts access to PLMNs not allowed in current location, then the system maintains proper network authorization and security, but the UE cannot access emergency services in NTN coverage areas where only such PLMNs are available
Solution Approach 1:
The system applies different PLMN selection rules based on location quality. In NTN coverage areas, the UE is allowed to access PLMNs that would normally be restricted in terrestrial areas. This local quality adjustment enables emergency service access in NTN while maintaining normal security restrictions in TN coverage areas.
Solution Approach 2:
Instead of applying the normal restriction rule that blocks PLMNs not allowed in current location, the system inverts the logic for emergency services in NTN. The UE is explicitly permitted to access such PLMNs when emergency services are required and NTN coverage is detected, reversing the conventional access control approach.
3Reliability
If the UE waits for ongoing service request procedures to complete before initiating emergency services, then the system maintains proper procedure sequencing, but the UE experiences delays in emergency service connection
Solution Approach 1:
The system prepares emergency service connections in advance by maintaining NAS signaling connections and pre-authorizing emergency access. When emergency services are needed, the connection is already established or can be rapidly activated without waiting for other service procedures to complete.
Solution Approach 2:
The system dynamically adjusts procedure sequencing based on service type. For emergency services, the UE is permitted to initiate and prioritize emergency service requests even when other service procedures are ongoing. The system dynamically switches to emergency mode, allowing parallel or interrupted processing to ensure emergency services receive priority treatment.
Data Source
AI summary
A method for handling one or more emergency services at a User Equipment (UE) via a New Generation-Radio Access Technology (NG-RAN) satellite cell, includes: receiving, from one or more applications associated with the UE, a request to access the one or more emergency services; determining a Public Land Mobile Network (PLMN) from one or more lists of PLMNs, wherein the one or more lists of PLMNs comprises at least a list of PLMNs not allowed to operate in a current location of the UE; and accessing the one or more emergency services by establishing a connection with the NG-RAN satellite cell associated with the determined PLMN.