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Implementation of the strongest cell handover algorithm, based on RSRP measurements and Event A3. More...

#include "nr-a3-rsrp-handover-algorithm.h"

Inheritance diagram for ns3::NrA3RsrpHandoverAlgorithm:

Collaboration diagram for ns3::NrA3RsrpHandoverAlgorithm:

Public Member Functions
	NrA3RsrpHandoverAlgorithm ()
	Creates a strongest cell 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< NrA3RsrpHandoverAlgorithm >
	let the forwarder class access the protected and private members

Detailed Description

Implementation of the strongest cell handover algorithm, based on RSRP measurements and Event A3.

The algorithm utilizes Event A3 (Section 5.5.4.4 of 3GPP TS 36.331) UE measurements and the Reference Signal Reference Power (RSRP). It is defined as the event when the UE perceives that a neighbour cell's RSRP is better than the serving cell's RSRP.

Handover margin (a.k.a. hysteresis) and time-to-trigger (TTT) can be configured to delay the event triggering. The values of these parameters apply to all attached UEs.

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::NrA3RsrpHandoverAlgorithm");
nrHelper->SetHandoverAlgorithmAttribute ("Hysteresis",
                                          DoubleValue (3.0));
nrHelper->SetHandoverAlgorithmAttribute ("TimeToTrigger",
                                          TimeValue (MilliSeconds (256)));
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

Hysteresis: Handover margin (hysteresis) in dB (rounded to the nearest multiple of 0.5 dB)
- Set with class: ns3::DoubleValue
- Underlying type: uint8_t 0:15
- Initial value: 3
- Flags: construct write read
TimeToTrigger: Time during which neighbour cell's RSRP must continuously higher than serving cell's RSRP in order to trigger a handover
- Set with class: ns3::TimeValue
- Underlying type: Time -9.22337e+18ns:+9.22337e+18ns
- Initial value: +2.56e+08ns
- Flags: construct write read

No TraceSources are defined for this type.
Size of this type is 112 bytes (on a 64-bit architecture).

Definition at line 51 of file nr-a3-rsrp-handover-algorithm.h.

Constructor & Destructor Documentation

◆ NrA3RsrpHandoverAlgorithm()

ns3::NrA3RsrpHandoverAlgorithm::NrA3RsrpHandoverAlgorithm ( )

Creates a strongest cell handover algorithm instance.

Definition at line 24 of file nr-a3-rsrp-handover-algorithm.cc.

References MemberNrHandoverManagementSapProvider< NrA3RsrpHandoverAlgorithm >.

◆ ~NrA3RsrpHandoverAlgorithm()

ns3::NrA3RsrpHandoverAlgorithm::~NrA3RsrpHandoverAlgorithm ( )

override

Definition at line 32 of file nr-a3-rsrp-handover-algorithm.cc.

Member Function Documentation

◆ DoDispose()

void ns3::NrA3RsrpHandoverAlgorithm::DoDispose ( )

overrideprotected

Definition at line 103 of file nr-a3-rsrp-handover-algorithm.cc.

◆ DoInitialize()

void ns3::NrA3RsrpHandoverAlgorithm::DoInitialize ( )

overrideprotected

Definition at line 79 of file nr-a3-rsrp-handover-algorithm.cc.

◆ DoReportUeMeas()

void ns3::NrA3RsrpHandoverAlgorithm::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 110 of file nr-a3-rsrp-handover-algorithm.cc.

References ns3::NrRrcSap::MeasResults::haveMeasResultNeighCells, ns3::NrRrcSap::MeasResults::measId, ns3::NrRrcSap::MeasResults::measResultListEutra, ns3::NrRrcSap::MeasResults::measResultPCell, ns3::NrRrcSap::MeasResultPCell::rsrpResult, and ns3::NrHandoverManagementSapUser::TriggerHandover().

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