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Handover algorithm implementation based on RSRQ measurements, Event A2 and Event A4. More...

#include "nr-a2-a4-rsrq-handover-algorithm.h"

Inheritance diagram for ns3::NrA2A4RsrqHandoverAlgorithm:

Collaboration diagram for ns3::NrA2A4RsrqHandoverAlgorithm:

Public Member Functions
	NrA2A4RsrqHandoverAlgorithm ()
	Creates an A2-A4-RSRQ handover algorithm instance.

NrHandoverManagementSapProvider *	GetNrHandoverManagementSapProvider () override
	Export the "provider" part of the Handover Management SAP interface.

void	SetNrHandoverManagementSapUser (NrHandoverManagementSapUser *s) override
	Set the "user" part of the Handover Management SAP interface that this handover algorithm instance will interact with.

Static Public Member Functions
static TypeId	GetTypeId ()
	Get the type ID.

Static Public Member Functions inherited from ns3::NrHandoverAlgorithm
static TypeId	GetTypeId ()
	Get the type ID.

Protected Member Functions
void	DoDispose () override

void	DoInitialize () override

void	DoReportUeMeas (uint16_t rnti, NrRrcSap::MeasResults measResults) override
	Implementation of NrHandoverManagementSapProvider::ReportUeMeas.

Protected Member Functions inherited from ns3::NrHandoverAlgorithm
void	DoDispose () override

Friends
class	MemberNrHandoverManagementSapProvider< NrA2A4RsrqHandoverAlgorithm >
	let the forwarder class access the protected and private members

Detailed Description

Handover algorithm implementation based on RSRQ measurements, Event A2 and Event A4.

Handover decision made by this algorithm is primarily based on Event A2 measurements (serving cell's RSRQ becomes worse than threshold). When the event is triggered, the first condition of handover is fulfilled.

Event A4 measurements (neighbour cell's RSRQ becomes better than threshold) are used to detect neighbouring cells and their respective RSRQ. When a neighbouring cell's RSRQ is higher than the serving cell's RSRQ by a certain offset, then the second condition of handover is fulfilled.

When the first and second conditions above are fulfilled, the algorithm informs the eNodeB RRC to trigger a handover.

The threshold for Event A2 can be configured in the ServingCellThreshold attribute. The offset used in the second condition can also be configured by setting the NeighbourCellOffset attribute.

The following code snippet is an example of using and configuring the handover algorithm in a simulation program:

Ptr<NrHelper> nrHelper = CreateObject<NrHelper> ();

NodeContainer gnbNodes;
// configure the nodes here...

nrHelper->SetHandoverAlgorithmType ("ns3::NrA2A4RsrqHandoverAlgorithm");
nrHelper->SetHandoverAlgorithmAttribute ("ServingCellThreshold",
                                          UintegerValue (30));
nrHelper->SetHandoverAlgorithmAttribute ("NeighbourCellOffset",
                                          UintegerValue (1));
NetDeviceContainer nrGnbDevs = nrHelper->InstallGnbDevice (gnbNodes);

Note: Setting the handover algorithm type and attributes after the call to NrHelper::InstallGnbDevice does not have any effect to the devices that have already been installed.

Introspection did not find any typical Config paths.

Attributes

ServingCellThreshold: If the RSRQ of the serving cell is worse than this threshold, neighbour cells are consider for handover. Expressed in quantized range of [0..34] as per Section 9.1.7 of 3GPP TS 36.133.
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:34
- Initial value: 30
- Flags: construct write read
NeighbourCellOffset: Minimum offset between the serving and the best neighbour cell to trigger the handover. Expressed in quantized range of [0..34] as per Section 9.1.7 of 3GPP TS 36.133.
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 1
- Flags: construct write read

No TraceSources are defined for this type.
Size of this type is 176 bytes (on a 64-bit architecture).

Definition at line 68 of file nr-a2-a4-rsrq-handover-algorithm.h.

Constructor & Destructor Documentation

◆ NrA2A4RsrqHandoverAlgorithm()

ns3::NrA2A4RsrqHandoverAlgorithm::NrA2A4RsrqHandoverAlgorithm ( )

Creates an A2-A4-RSRQ handover algorithm instance.

Definition at line 32 of file nr-a2-a4-rsrq-handover-algorithm.cc.

References MemberNrHandoverManagementSapProvider< NrA2A4RsrqHandoverAlgorithm >.

◆ ~NrA2A4RsrqHandoverAlgorithm()

ns3::NrA2A4RsrqHandoverAlgorithm::~NrA2A4RsrqHandoverAlgorithm ( )

override

Definition at line 42 of file nr-a2-a4-rsrq-handover-algorithm.cc.

Member Function Documentation

◆ DoDispose()

void ns3::NrA2A4RsrqHandoverAlgorithm::DoDispose ( )

overrideprotected

Definition at line 117 of file nr-a2-a4-rsrq-handover-algorithm.cc.

◆ DoInitialize()

void ns3::NrA2A4RsrqHandoverAlgorithm::DoInitialize ( )

overrideprotected

Definition at line 89 of file nr-a2-a4-rsrq-handover-algorithm.cc.

◆ DoReportUeMeas()

void ns3::NrA2A4RsrqHandoverAlgorithm::DoReportUeMeas	(	uint16_t	rnti,
		NrRrcSap::MeasResults	measResults
	)

overrideprotectedvirtual

Implementation of NrHandoverManagementSapProvider::ReportUeMeas.

Parameters

rnti	Radio Network Temporary Identity, an integer identifying the UE where the report originates from
measResults	a single report of one measurement identity

Implements ns3::NrHandoverAlgorithm.

Definition at line 124 of file nr-a2-a4-rsrq-handover-algorithm.cc.

References ns3::NrRrcSap::MeasResults::haveMeasResultNeighCells, ns3::NrRrcSap::MeasResults::measId, ns3::NrRrcSap::MeasResults::measResultListEutra, ns3::NrRrcSap::MeasResults::measResultPCell, and ns3::NrRrcSap::MeasResultPCell::rsrqResult.