The IP2Nic module acts as a bridge between the IP network layer and the cellular (LTE/NR) protocol stack. It exhibits slightly different behavior when operating in the UE compared to the BS. Its main functionalities include:

• Registering itself as an interface for accessibility from upper layers (e.g., IP Layer).
• Adding control information to IP packets (5-tuple) in the downstream direction. Additionally, in the BS module, it appends the destination ID to the control information to ensure packets are sent to the correct UE.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Parameters

Name	Type	Default value	Description
nodeType	string
interfaceTableModule	string
interfaceName	string	"cellular"
routingTableModule	string
binderModule	string	"binder"
handoverManagerModule	string	""

Properties

Name	Value	Description
display	i=block/layer

Gates

Name	Direction	Size	Description
upperLayerIn	input		connection to network layer. These gate names are recognized by the network layer (same as the ones in the INetworkInterface interface)
upperLayerOut	output
stackNic	inout		connection to the cellular stack

Source code

//
// The IP2Nic module acts as a bridge between the IP network layer and the cellular (LTE/NR) protocol stack.
// It exhibits slightly different behavior when operating in the UE compared to the BS.
// Its main functionalities include:
// - Registering itself as an interface for accessibility from upper layers (e.g., IP Layer).
// - Adding control information to IP packets (5-tuple) in the downstream direction. Additionally, in the BS
//   module, it appends the destination ID to the control information to ensure packets are sent to the correct UE.
//
simple IP2Nic like INetworkLayer2CellularNic
{
    parameters:
        string nodeType;
        string interfaceTableModule;
        string interfaceName = default("cellular");
        string routingTableModule;
        string binderModule = default("binder");
        string handoverManagerModule = default("");
        @display("i=block/layer");
    gates:
        // connection to network layer.
        // These gate names are recognized by the network layer (same as the ones in the INetworkInterface interface)
        input upperLayerIn;
        output upperLayerOut;

        // connection to the cellular stack
        inout stackNic @labels(IPDatagram);
}

File: src/stack/ip2nic/IP2Nic.ned

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