LTE Router Proxy for Non-UICC VoIP via SIP Signaling Conversion
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Solution Overview
Problem
Non-Universal Integrated Circuit Card (UICC) devices are unable to directly access LTE access networks, limiting their ability to utilize Voice over Internet Protocol (VoIP) services provided by Internet Protocol Multimedia Subsystem (IMS) networks, as they lack the necessary protocol compliance and capabilities.
Innovation Solution
An LTE mobile router with a UICC functions as a proxy for non-UICC client devices, intercepting and modifying Session Initiation Protocol (SIP) signaling to convert it into 3GPP IMS compliant signaling, enabling access to IMS networks and providing necessary functionalities such as bearer management and resource reservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-UICC devices are used to access LTE networks, then device compatibility and ease of operation improve, but the ability to directly access IMS networks and use VoIP services deteriorates due to lack of protocol compliance
Solution Approach 1:
The LTE mobile router acts as an intermediary device between non-UICC client devices and the IMS network. It receives SIP signaling from non-UICC devices, converts it into 3GPP IMS compliant signaling, and forwards it to the IMS network. This mediator approach allows non-UICC devices to access IMS services without requiring them to natively support the required protocols, thus resolving the contradiction between device compatibility and network access capability.
2Adaptability or versatility
If non-UICC devices register directly with IMS networks, then device autonomy improves, but protocol compliance and network access reliability deteriorate
Solution Approach 1:
The router serves as a protocol translation intermediary that maintains device autonomy while ensuring protocol compliance. Non-UICC devices can operate with their existing SIP protocol implementations without modification, while the router handles the complex protocol conversion to 3GPP IMS compliant signaling, thus preserving both device versatility and network access reliability.
Solution Approach 2:
Instead of requiring client devices to adapt to IMS protocol requirements, the solution inverts the adaptation burden by having the router adapt to the client devices' protocol capabilities. The router converts standard SIP from non-UICC devices into the specialized 3GPP IMS signaling format, reversing the traditional model where the client must comply with network protocols.
3Adaptability or versatility
If LTE mobile router acts as proxy for non-UICC devices, then service coverage and adaptability improve, but system complexity increases due to signaling interception and modification
Solution Approach 1:
The LTE mobile router performs multiple functions: it acts as a cellular network interface, provides Wi-Fi/LAN connectivity for client devices, performs SIP signaling interception, converts signaling protocols, and manages bearer resources. By consolidating these diverse functions into a single multi-functional device, the system achieves broad service coverage while managing complexity through functional integration rather than adding separate systems.
Data Source
AI summary
In one embodiment a router connects to a cellular network using at least one authentication credential stored on a smart card of the router. The router receives, from a client device coupled to the router, a Session Initiation Protocol (SIP) request to register with an Internet Protocol Multimedia Subsystem (IMS) network coupled to the cellular network. The router sends a SIP registration request for the client device to the IMS network, the SIP registration request comprising authorization information associated with the router, wherein the authorization information associated with the router is used by the IMS network to register the client device with the IMS network.