NED File src/nodes/PgwStandard.ned

Name	Type	Description
PgwStandard	compound module	This module implements a simplified model of the EPC PDN Gateway (P-GW) of a 4G LTE network. It serves as the entry point to the core network of an LTE network, thus bridging it to the rest of the Internet. Packets arriving from the Internet are tunneled to the appropriate next hop in the core network (e.g., the eNodeB that will transmit the packet to the destination User Equipment through the radio access network) using the GPRS Tunneling Protocol (GTP). Conversely, packets received from the core network are detunneled and sent to the Internet (e.g., towards a remote server). To accomplish this, it utilizes a GtpUser module that handles GTP (de)tunneling, along with the TrafficFlowFilter module, which classifies incoming packets.

Source code

//
//                  Simu5G
//
// Authors: Giovanni Nardini, Giovanni Stea, Antonio Virdis (University of Pisa)
//
// This file is part of a software released under the license included in file
// "license.pdf". Please read LICENSE and README files before using it.
// The above files and the present reference are part of the software itself,
// and cannot be removed from it.
//
package simu5g.nodes;

import inet.common.MessageDispatcher;
import inet.linklayer.ppp.PppInterface;
import inet.transportlayer.udp.Udp;
import inet.node.base.NetworkLayerNodeBase;
import simu5g.corenetwork.gtp.GtpUser;
import simu5g.corenetwork.trafficFlowFilter.TrafficFlowFilter;

//
// This module implements a simplified model of the EPC PDN Gateway (P-GW) of a 4G LTE network.
// It serves as the entry point to the core network of an LTE network, thus bridging it to the rest
// of the Internet. Packets arriving from the Internet are tunneled to the appropriate next hop in
// the core network (e.g., the ~eNodeB that will transmit the packet to the destination User Equipment
// through the radio access network) using the GPRS Tunneling Protocol (GTP). Conversely, packets
// received from the core network are detunneled and sent to the Internet (e.g., towards a remote server).
// To accomplish this, it utilizes a ~GtpUser module that handles GTP (de)tunneling, along with the
// ~TrafficFlowFilter module, which classifies incoming packets.
//
module PgwStandard extends NetworkLayerNodeBase
{
    parameters:
        @display("bgb=1350,750;i=device/mainframe");
        @figure[applicationLayer](type=rectangle; pos=250,6; size=1000,130; lineColor=#808080; cornerRadius=5; fillColor=#ffff00; fillOpacity=0.1);
        @figure[applicationLayer.title](type=text; pos=1245,11; anchor=ne; text="application layer");
        @figure[transportLayer](type=rectangle; pos=250,156; size=1000,130; fillColor=#ff0000; lineColor=#808080; cornerRadius=5; fillOpacity=0.1);
        @figure[transportLayer.title](type=text; pos=1245,161; anchor=ne; text="transport layer");
        @figure[submodules];

        string nodeType = "PGW";

        forwarding = default(true);
        multicastForwarding = default(false);
        // numPppInterfaces = 1;

    gates:
        inout filterGate @labels(PppFrame-conn);

    submodules:
        pppIf: PppInterface {
            parameters:
                @display("p=1150,525");
        }
        udp: Udp {
            parameters:
                @display("p=330,206");
        }
        trafficFlowFilter: TrafficFlowFilter {
            parameters:
                @display("p=675,80");
                ownerType = parent.nodeType;
        }
        gtp_user: GtpUser {
            parameters:
                @display("p=525,80");
        }
        tn: MessageDispatcher {
            parameters:
                @display("p=750,300;b=1000,5,,,,1");
        }
        at: MessageDispatcher {
            parameters:
                @display("p=750,146;b=1000,5,,,,1");
        }

    connections:

        gtp_user.socketOut --> at.in++;
        gtp_user.socketIn <-- at.out++;

        pppIf.upperLayerOut --> trafficFlowFilter.internetFilterGateIn;
        pppIf.upperLayerIn <-- gtp_user.pppGate;

        trafficFlowFilter.gtpUserGateOut --> gtp_user.trafficFlowFilterGate;

        // at dispatcher to transport layer connections
        at.out++ --> udp.appIn;
        at.in++ <-- udp.appOut;

        // transport layer to tn dispatcher connections
        udp.ipOut --> tn.in++;
        udp.ipIn <-- tn.out++;

        // tn dispatcher to network layer connections
        tn.out++ --> ipv4.transportIn if hasIpv4;
        tn.in++ <-- ipv4.transportOut if hasIpv4;

        tn.out++ --> ipv6.transportIn if hasIpv6;
        tn.in++ <-- ipv6.transportOut if hasIpv6;

        tn.out++ --> generic.transportIn if hasGn;
        tn.in++ <-- generic.transportOut if hasGn;

        tn.out++ --> nl.in++;
        tn.in++ <-- nl.out++;

        pppIf.phys <--> filterGate;
}