Wireless Modem Intermediary for Protocol Translation
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Solution Overview
Problem
In communication systems, when a host equipment tries to obtain internet connectivity via a modem using a point-to-multipoint link protocol, compatibility issues arise if the cellular network expects a point-to-point connection, leading to preclusion of user data traffic due to the lack of a physical identifier for the gateway, especially when the modem connects to a single gateway.
Innovation Solution
The modem intercepts messages between the gateway and the host, generates a substitute address identifying its interface, and communicates this address to the host, allowing it to operate as a router and resolve the physical address requirement, enabling point-to-multipoint connections even when the cellular network expects point-to-point connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a point-to-multipoint link protocol is used between the host and modem, then the modem can support multiple potential connections and provide greater connectivity flexibility, but the cellular network gateway expects a point-to-point connection and precludes user data traffic due to lack of physical address compatibility
Solution Approach 1:
The modem acts as an intermediary device between the host terminal and the cellular network gateway. It intercepts Neighbor Advertisement messages from the gateway, generates substitute Link Layer Addresses that identify its own interfaces, and communicates these addresses to the host. This mediation resolves the protocol incompatibility by translating between point-to-multipoint requirements (host side) and point-to-point expectations (gateway side), enabling user data transmission while maintaining connectivity flexibility.
2Adaptability or versatility
If the modem generates and uses a substitute address identifying its interface, then physical address compatibility is achieved for point-to-multipoint protocols, but the system complexity increases due to message interception and address substitution operations
Solution Approach 1:
The modem performs self-service by autonomously generating substitute Link Layer Addresses that identify its own interfaces. Instead of requiring external address assignment or complex address translation tables, the modem creates its own addresses and uses them to communicate with both the host terminal and the cellular network gateway. This self-service approach reduces the need for additional address management infrastructure while maintaining protocol compatibility.
Data Source
AI summary
An apparatus comprising a wireless modem for use at a terminal, the modem being adapted to connect to the terminal via a first connection, and to connect via a second, wireless connection to a gateway between a wireless cellular network and a further, packet-based network. The modem is operable to connect to the gateway via the second connection using a point-to-point link protocol that does not require a physical address for the gateway, and is operable to connect to the host terminal via the first connection using a point-to-multipoint link protocol that supports point-to-multipoint connection and does require a physical address for the gateway. The modem is configured to intercept a message being conveyed between the gateway and the terminal, to generate a substitute address that identifies an interface of the modem, and in response to intercepting the message to communicate the substitute address to the terminal.