Forwards the downlink a handover source holds for a UE leg to the target base station over X2-U, and delivers what arrives from a source to this node's HandoverPacketHolderEnb: the data forwarding of the handover, between the source's and the target's packet holders, through the LteX2Manager. The handover's signaling is the base stations' control plane's (ConnectionControlEnb).

Inheritance diagram

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

Used in compound modules

Name	Type	Description
LteNicEnb	compound module	The LteNicEnb module is a network interface that provides LTE connectivity within an eNodeB. It implements the data and signaling planes of the LTE stack, which includes the PDCP, RLC, MAC, and PHY layers. The parameters and submodules allow customization of the eNodeB's behavior, including whether it supports D2D communication, CoMP (Coordinated MultiPoint), or dual connectivity.

Parameters

Name	Type	Default value	Description
losslessHandover	bool	false

Properties

Name	Value	Description
display	i=block/cogwheel
class	HandoverX2Forwarder

Gates

Name	Direction	Size	Description
x2ManagerIn	input
x2ManagerOut	output
tunnelOut	output		Data packets received via the X2 tunnel during handover
dataIn	input		Data packets from HandoverPacketHolder to forward via X2

Source code

//
// Forwards the downlink a handover source holds for a UE leg to the target base
// station over X2-U, and delivers what arrives from a source to this node's
// ~HandoverPacketHolderEnb: the data forwarding of the handover, between the source's
// and the target's packet holders, through the ~LteX2Manager. The handover's
// signaling is the base stations' control plane's (~ConnectionControlEnb).
//
simple HandoverX2Forwarder like IHandoverX2Forwarder
{
    parameters:
        @display("i=block/cogwheel");
        @class("HandoverX2Forwarder");

        bool losslessHandover = default(false);

    gates:
        //# Connections to the X2 Manager
        input x2ManagerIn;
        output x2ManagerOut;

        output tunnelOut; // Data packets received via the X2 tunnel during handover
        input dataIn; // Data packets from HandoverPacketHolder to forward via X2
}

File: src/simu5g/stack/handoverX2Forwarder/HandoverX2Forwarder.ned

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