Assign entire symbols in a round-robin fashion. More...

#include "nr-mac-scheduler-tdma-rr.h"

Inheritance diagram for ns3::NrMacSchedulerTdmaRR:

Collaboration diagram for ns3::NrMacSchedulerTdmaRR:

Public Member Functions
	NrMacSchedulerTdmaRR ()
	NrMacSchedulerTdmaRR constructor.

	~NrMacSchedulerTdmaRR () override
	~NrMacSchedulerTdmaRR deconstructor

Public Member Functions inherited from ns3::NrMacSchedulerTdma
	NrMacSchedulerTdma ()
	NrMacSchedulerTdma constructor.

	~NrMacSchedulerTdma () override
	NrMacSchedulerTdma deconstructor.

Public Member Functions inherited from ns3::NrMacSchedulerNs3
	NrMacSchedulerNs3 ()
	NrMacSchedulerNs3 default constructor.

	NrMacSchedulerNs3 (const NrMacSchedulerNs3 &other)=delete
	NrMacSchedulerNs3 copy constructor (deleted) More...

	~NrMacSchedulerNs3 () override
	NrMacSchedulerNs3 deconstructor.

int64_t	AssignStreams (int64_t stream) override
	Assign a fixed random variable stream number to the random variables used by this model. Return the number of streams (possibly zero) that have been assigned. More...

void	DoCschedCellConfigReq (const NrMacCschedSapProvider::CschedCellConfigReqParameters &params) override
	Cell configuration. More...

void	DoCschedLcConfigReq (const NrMacCschedSapProvider::CschedLcConfigReqParameters &params) override
	Configure a logical channel for a UE. More...

void	DoCschedLcReleaseReq (const NrMacCschedSapProvider::CschedLcReleaseReqParameters &params) override
	Release a LC. More...

void	DoCschedUeConfigReq (const NrMacCschedSapProvider::CschedUeConfigReqParameters &params) override
	Register an UE. More...

void	DoCschedUeReleaseReq (const NrMacCschedSapProvider::CschedUeReleaseReqParameters &params) override
	Release an UE. More...

void	DoSchedDlCqiInfoReq (const NrMacSchedSapProvider::SchedDlCqiInfoReqParameters &params) override
	Received a DL CQI message. More...

void	DoSchedDlRachInfoReq (const NrMacSchedSapProvider::SchedDlRachInfoReqParameters &params) override
	RACH information. More...

void	DoSchedDlRlcBufferReq (const NrMacSchedSapProvider::SchedDlRlcBufferReqParameters &params) override
	RLC informs of DL data. More...

void	DoSchedDlTriggerReq (const NrMacSchedSapProvider::SchedDlTriggerReqParameters &params) override
	Decide how to fill the frequency/time of a DL slot. More...

void	DoSchedSetMcs (uint32_t mcs) override
	Set a fixed MCS. More...

void	DoSchedUlCqiInfoReq (const NrMacSchedSapProvider::SchedUlCqiInfoReqParameters &params) override
	Received a UL CQI message. More...

void	DoSchedUlMacCtrlInfoReq (const NrMacSchedSapProvider::SchedUlMacCtrlInfoReqParameters &params) override
	Evaluate different types of control messages (only BSR for the moment) More...

void	DoSchedUlSrInfoReq (const NrMacSchedSapProvider::SchedUlSrInfoReqParameters &params) override
	Save the SR list into m_srList. More...

void	DoSchedUlTriggerReq (const NrMacSchedSapProvider::SchedUlTriggerReqParameters &params) override
	Decide how to fill the frequency/time of a UL slot. More...

void	EnableHarqReTx (bool enableFlag)
	Enable HARQ ReTx function. More...

Time	GetCqiTimerThreshold () const
	Get the CqiTimerThreshold. More...

Ptr< const NrAmc >	GetDlAmc () const
	Get the AMC for DL. More...

uint8_t	GetDlCtrlSyms () const override
	Retrieve the number of DL ctrl symbols configured in the scheduler. More...

std::vector< uint8_t >	GetDlNotchedRbgMask () const
	Get the notched (blank) RBGs Mask for the DL. More...

int8_t	GetMaxDlMcs () const
	Get the maximum DL MCS index. More...

uint8_t	GetSrsCtrlSyms () const
	Get the configured value for the SRS symbols. More...

uint8_t	GetStartMcsDl () const
	Get the DL MCS starting value. More...

uint8_t	GetStartMcsUl () const
	Get the DL MCS starting value. More...

Ptr< const NrAmc >	GetUlAmc () const
	Get the AMC for UL. More...

uint8_t	GetUlCtrlSyms () const override
	Retrieve the number of UL ctrl symbols configured in the scheduler. More...

std::vector< uint8_t >	GetUlNotchedRbgMask () const
	Get the notched (blank) RBGs Mask for the UL. More...

void	InstallDlAmc (const Ptr< NrAmc > &dlAmc)
	Install the AMC for the DL part. More...

void	InstallUlAmc (const Ptr< NrAmc > &ulAmc)
	Install the AMC for the DL part. More...

bool	IsDlMcsFixed () const
	Check if the MCS in DL is fixed. More...

bool	IsHarqReTxEnable () const
	Is HARQ ReTx enable function. More...

bool	IsSrsInFSlots () const
	Check if the F slots are allowed for SRS transmission. More...

bool	IsSrsInUlSlots () const
	Check if the UL slots are allowed for SRS transmission. More...

bool	IsUlMcsFixed () const
	Check if the MCS in UL is fixed. More...

void	SetCqiTimerThreshold (const Time &v)
	Set the CqiTimerThreshold. More...

void	SetDlCtrlSyms (uint8_t v)
	Set the number of DL ctrl symbols. More...

void	SetDlNotchedRbgMask (const std::vector< uint8_t > &dlNotchedRbgsMask)
	Set the notched (blank) RBGs Mask for the DL. More...

void	SetFixedDlMcs (bool v)
	Set if the MCS in DL is fixed (in case, it will take the starting value) More...

void	SetFixedUlMcs (bool v)
	Set if the MCS in UL is fixed (in case, it will take the starting value) More...

void	SetLcSched (const TypeId &type)
	Set LC Scheduler Algorithm model type. More...

void	SetMaxDlMcs (int8_t v)
	Set the maximum index for the DL MCS. More...

void	SetSrsCtrlSyms (uint8_t v)
	Set the number of UL SRS symbols. More...

void	SetSrsInFSlots (bool v)
	Set if the F slots are allowed for SRS transmission. More...

void	SetSrsInUlSlots (bool v)
	Set if the UL slots are allowed for SRS transmission (if True, UL and F slots may carry SRS, if False, SRS are transmitted only in F slots) More...

void	SetStartMcsDl (uint8_t v)
	Set the starting value for the DL MCS. More...

void	SetStartMcsUl (uint8_t v)
	Set the starting value for the UL MCS. More...

void	SetUlCtrlSyms (uint8_t v)
	Set the number of UL ctrl symbols. More...

void	SetUlNotchedRbgMask (const std::vector< uint8_t > &ulNotchedRbgsMask)
	Set the notched (blank) RBGs Mask for the UL. More...

Public Member Functions inherited from ns3::NrMacScheduler
	NrMacScheduler ()
	NrMacScheduler constructor.

	~NrMacScheduler () override
	NrMacScheduler deconstructor.

NrMacCschedSapProvider *	GetMacCschedSapProvider ()
	Get the MacCschedSapProvider pointer. More...

NrMacSchedSapProvider *	GetMacSchedSapProvider ()
	Get the MacSchedSapProvider pointer. More...

void	SetMacCschedSapUser (NrMacCschedSapUser *sap)
	SetMacCschedSapUser. More...

void	SetMacSchedSapUser (NrMacSchedSapUser *sap)
	Set the MacSchedSapUser pointer. More...

Static Public Member Functions
static TypeId	GetTypeId ()
	GetTypeId. More...

Static Public Member Functions inherited from ns3::NrMacSchedulerTdma
static TypeId	GetTypeId ()
	GetTypeId. More...

Static Public Member Functions inherited from ns3::NrMacSchedulerNs3
static TypeId	GetTypeId ()
	GetTypeId. More...

Static Public Member Functions inherited from ns3::NrMacScheduler
static TypeId	GetTypeId ()
	Get the type id. More...

Protected Member Functions
void	AssignedDlResources (const UePtrAndBufferReq &ue, const FTResources &assigned, const FTResources &totAssigned) const override
	Update the UE representation after a symbol (DL) has been assigned to it. More...

void	AssignedUlResources (const UePtrAndBufferReq &ue, const FTResources &assigned, const FTResources &totAssigned) const override
	Update the UE representation after a symbol (DL) has been assigned to it. More...

void	BeforeDlSched (const UePtrAndBufferReq &ue, const FTResources &assignableInIteration) const override
	Prepare UE for the DL scheduling. More...

void	BeforeUlSched (const UePtrAndBufferReq &ue, const FTResources &assignableInIteration) const override
	Prepare UE for the UL scheduling. More...

std::shared_ptr< NrMacSchedulerUeInfo >	CreateUeRepresentation (const NrMacCschedSapProvider::CschedUeConfigReqParameters &params) const override
	Create an UE representation of the type NrMacSchedulerUeInfoRR. More...

std::function< bool(const NrMacSchedulerNs3::UePtrAndBufferReq &lhs, const NrMacSchedulerNs3::UePtrAndBufferReq &rhs)>	GetUeCompareDlFn () const override
	Return the comparison function to sort DL UE according to the scheduler policy. More...

std::function< bool(const NrMacSchedulerNs3::UePtrAndBufferReq &lhs, const NrMacSchedulerNs3::UePtrAndBufferReq &rhs)>	GetUeCompareUlFn () const override
	Return the comparison function to sort UL UE according to the scheduler policy. More...

void	NotAssignedDlResources (const UePtrAndBufferReq &ue, const FTResources &notAssigned, const FTResources &totalAssigned) const override
	Update the UE representation after a symbol (DL) has been assigned to other UE. More...

void	NotAssignedUlResources (const UePtrAndBufferReq &ue, const FTResources &notAssigned, const FTResources &totalAssigned) const override
	Update the UE representation after a symbol (UL) has been assigned to other UE. More...

Protected Member Functions inherited from ns3::NrMacSchedulerTdma
BeamSymbolMap	AssignDLRBG (uint32_t symAvail, const ActiveUeMap &activeDl) const override
	Assign the available DL RBG to the UEs. More...

BeamSymbolMap	AssignULRBG (uint32_t symAvail, const ActiveUeMap &activeUl) const override
	Assign the available UL RBG to the UEs. More...

void	ChangeDlBeam ([[maybe_unused]] PointInFTPlane *spoint, [[maybe_unused]] uint32_t symOfBeam) const override
	Not doing anything, moving forward the spoint is done by CreateDci. More...

void	ChangeUlBeam ([[maybe_unused]] PointInFTPlane *spoint, [[maybe_unused]] uint32_t symOfBeam) const override
	Not doing anything, moving forward the spoint is done by CreateDci. More...

std::shared_ptr< DciInfoElementTdma >	CreateDlDci (PointInFTPlane *spoint, const std::shared_ptr< NrMacSchedulerUeInfo > &ueInfo, uint32_t maxSym) const override
	Create a DL DCI starting from spoint and spanning maxSym symbols. More...

std::shared_ptr< DciInfoElementTdma >	CreateUlDci (PointInFTPlane *spoint, const std::shared_ptr< NrMacSchedulerUeInfo > &ueInfo, uint32_t maxSym) const override
	Create a UL DCI starting from spoint and spanning maxSym symbols. More...

uint8_t	GetTpc () const override
	Returns TPC command.

Protected Member Functions inherited from ns3::NrMacSchedulerNs3
virtual void	ChangeDlBeam (PointInFTPlane *spoint, uint32_t symOfBeam) const =0
	Perform a custom operation on the starting point each time all the UE of a DL beam have been scheduled. More...

virtual void	ChangeUlBeam (PointInFTPlane *spoint, uint32_t symOfBeam) const =0
	Perform a custom operation on the starting point each time all the UE of an UL beam have been scheduled. More...

virtual LCPtr	CreateLC (const LogicalChannelConfigListElement_s &config) const
	Create a logical channel starting from a configuration. More...

virtual LCGPtr	CreateLCG (const LogicalChannelConfigListElement_s &config) const
	Create a logical channel group starting from a configuration. More...

uint16_t	GetBandwidthInRbg () const

uint16_t	GetBwpId () const
	Get the bwp id of this MAC. More...

uint16_t	GetCellId () const
	Get the cell id of this MAC. More...

uint64_t	GetNumRbPerRbg () const
	Private function that is used to get the number of resource blocks per resource block group and also to check whether this value is configured. More...

virtual uint8_t	ScheduleDlHarq (NrMacSchedulerNs3::PointInFTPlane startingPoint, uint8_t symAvail, const ActiveHarqMap &activeDlHarq, const std::unordered_map< uint16_t, UePtr > &ueMap, std::vector< DlHarqInfo > dlHarqToRetransmit, const std::vector< DlHarqInfo > &dlHarqFeedback, SlotAllocInfo *slotAlloc) const
	Giving the input, append to slotAlloc the allocations for the DL HARQ retransmissions. More...

virtual uint8_t	ScheduleUlHarq (NrMacSchedulerNs3::PointInFTPlane startingPoint, uint8_t symAvail, const std::unordered_map< uint16_t, UePtr > &ueMap, std::vector< UlHarqInfo > ulHarqToRetransmit, const std::vector< UlHarqInfo > &ulHarqFeedback, SlotAllocInfo *slotAlloc) const
	Giving the input, append to slotAlloc the allocations for the DL HARQ retransmissions. More...

virtual void	SortDlHarq (ActiveHarqMap *activeDlHarq) const
	Sort the DL HARQ retransmission. More...

virtual void	SortUlHarq (ActiveHarqMap *activeUlHarq) const
	Sort the UL HARQ retransmission. More...

Additional Inherited Members
Public Types inherited from ns3::NrMacSchedulerNs3
typedef std::unordered_map< BeamId, HarqVectorIteratorList, BeamIdHash >	ActiveHarqMap
	Map between a beamID and the HARQ of that beam.

typedef std::unordered_map< BeamId, std::vector< UePtrAndBufferReq >, BeamIdHash >	ActiveUeMap
	Map between a BeamId and a vector of UE (the UE are in that beam)

typedef std::unordered_map< BeamId, uint32_t, BeamIdHash >	BeamSymbolMap
	Map between a BeamId and the symbol assigned to that beam.

typedef PointInFTPlane	FTResources
	Represent an amount of RBG/symbols that can be, or is, assigned.

using	HarqVectorIterator = NrMacHarqVector::iterator

using	HarqVectorIteratorList = std::vector< HarqVectorIterator >

typedef std::pair< UePtr, uint32_t >	UePtrAndBufferReq
	Pair between a pointer to NrMacSchedulerUeInfo and its buffer occupancy.

Protected Attributes inherited from ns3::NrMacSchedulerNs3
Ptr< NrAmc >	m_dlAmc
	AMC pointer.

Ptr< NrAmc >	m_ulAmc
	AMC pointer.

Protected Attributes inherited from ns3::NrMacScheduler
NrMacCschedSapProvider *	m_macCschedSapProvider {nullptr}
	SAP Provider.

NrMacCschedSapUser *	m_macCschedSapUser {nullptr}
	SAP User.

NrMacSchedSapProvider *	m_macSchedSapProvider {nullptr}
	SAP Provider.

NrMacSchedSapUser *	m_macSchedSapUser {nullptr}
	SAP user.

Detailed Description

Assign entire symbols in a round-robin fashion.

Each UE will receive a proportional number of symbols. With UE, each one will receive:

$sym_{i} = \frac{totSym}{n}$

If , then there will be UEs which will not have any symbol assigned. The class does not remember the UEs which did not get any symbol in the previous slot, so this opens the door to a possible starvation.

See also: NrMacSchedulerUeInfoRR

Introspection did not find any typical Config paths.
No Attributes are defined for this type.

Attributes defined in parent class ns3::NrMacSchedulerNs3

CqiTimerThreshold: The time while a CQI is valid
- Set with class: ns3::TimeValue
- Underlying type: Time –9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +1000000000.0ns
- Flags: construct write read
FixedMcsDl: Fix MCS to value set in StartingMcsDl
- Set with class: BooleanValue
- Underlying type: bool
- Initial value: false
- Flags: construct write read
FixedMcsUl: Fix MCS to value set in StartingMcsUl
- Set with class: BooleanValue
- Underlying type: bool
- Initial value: false
- Flags: construct write read
StartingMcsDl: Starting MCS for DL
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 0
- Flags: construct write read
StartingMcsUl: Starting MCS for UL
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 0
- Flags: construct write read
DlCtrlSymbols: Number of symbols allocated for DL CTRL
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 1
- Flags: construct write read
UlCtrlSymbols: Number of symbols allocated for UL CTRL
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 1
- Flags: construct write read
DlAmc: The DL AMC of this scheduler
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::NrAmc>
- Initial value: 0
- Flags: construct write read
UlAmc: The UL AMC of this scheduler
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::NrAmc>
- Initial value: 0
- Flags: construct write read

No TraceSources are defined for this type.
Size of this type is 504 bytes (on a 64-bit architecture).

Definition at line 30 of file nr-mac-scheduler-tdma-rr.h.

Member Function Documentation

◆ AssignedDlResources()

void ns3::NrMacSchedulerTdmaRR::AssignedDlResources	(	const UePtrAndBufferReq &	ue,
		const FTResources &	assigned,
		const FTResources &	totAssigned
	)		const

overrideprotectedvirtual

Update the UE representation after a symbol (DL) has been assigned to it.

Parameters

ue	UE to which a symbol has been assigned
assigned	the amount of resources assigned
totAssigned	the total amount of resources assigned in the slot

Update DL metrics by calling NrMacSchedulerUeInfoRR::UpdateDlMetric

Implements ns3::NrMacSchedulerTdma.

Definition at line 49 of file nr-mac-scheduler-tdma-rr.cc.

References ns3::NrMacSchedulerNs3::m_dlAmc.

◆ AssignedUlResources()

void ns3::NrMacSchedulerTdmaRR::AssignedUlResources	(	const UePtrAndBufferReq &	ue,
		const FTResources &	assigned,
		const FTResources &	totAssigned
	)		const

overrideprotectedvirtual

Update the UE representation after a symbol (DL) has been assigned to it.

Parameters

ue	UE to which a symbol has been assigned
assigned	the amount of resources assigned
totAssigned	the total amount of resources assigned in the slot

Update DL metrics by calling NrMacSchedulerUeInfoRR::UpdateUlMetric

Implements ns3::NrMacSchedulerTdma.

Definition at line 59 of file nr-mac-scheduler-tdma-rr.cc.

References ns3::NrMacSchedulerNs3::m_ulAmc.

◆ BeforeDlSched()

void ns3::NrMacSchedulerTdmaRR::BeforeDlSched	(	const UePtrAndBufferReq &	ue,
		const FTResources &	assignableInIteration
	)		const

inlineoverrideprotectedvirtual

Prepare UE for the DL scheduling.

Parameters

ue	UE that is eligible for an assignation in any iteration round
assignableInIteration	Resources that can be assigned in each iteration

The default implementation is empty, but a subclass can specialize the behaviour, e.g., to calculate some value before the choice of RBG to assign to each UE is done.

Implements ns3::NrMacSchedulerTdma.

Definition at line 114 of file nr-mac-scheduler-tdma-rr.h.

◆ BeforeUlSched()

void ns3::NrMacSchedulerTdmaRR::BeforeUlSched	(	const UePtrAndBufferReq &	ue,
		const FTResources &	assignableInIteration
	)		const

inlineoverrideprotectedvirtual

Prepare UE for the UL scheduling.

Parameters

ue	UE that is eligible for an assignation in any iteration round
assignableInIteration	Resources that can be assigned in each iteration

The default implementation is empty, but a subclass can specialize the behaviour, e.g., to calculate some value before the choice of RBG to assign to each UE is done.

Implements ns3::NrMacSchedulerTdma.

Definition at line 119 of file nr-mac-scheduler-tdma-rr.h.

◆ CreateUeRepresentation()

std::shared_ptr< NrMacSchedulerUeInfo > ns3::NrMacSchedulerTdmaRR::CreateUeRepresentation ( const NrMacCschedSapProvider::CschedUeConfigReqParameters & params ) const

overrideprotectedvirtual

Create an UE representation of the type NrMacSchedulerUeInfoRR.

Parameters

params parameters

Returns: NrMacSchedulerUeInfoRR instance

Implements ns3::NrMacSchedulerNs3.

Definition at line 38 of file nr-mac-scheduler-tdma-rr.cc.

References ns3::NrMacSchedulerNs3::GetNumRbPerRbg(), and ns3::NrMacCschedSapProvider::CschedUeConfigReqParameters::m_beamId.

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◆ GetTypeId()

TypeId ns3::NrMacSchedulerTdmaRR::GetTypeId ( )

static

GetTypeId.

Returns: The TypeId of the class

Definition at line 23 of file nr-mac-scheduler-tdma-rr.cc.

Referenced by ns3::NrHelper::NrHelper().

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◆ GetUeCompareDlFn()

std::function< bool(const NrMacSchedulerNs3::UePtrAndBufferReq &lhs, const NrMacSchedulerNs3::UePtrAndBufferReq &rhs)> ns3::NrMacSchedulerTdmaRR::GetUeCompareDlFn ( ) const

overrideprotectedvirtual

Return the comparison function to sort DL UE according to the scheduler policy.

Returns: a pointer to NrMacSchedulerUeInfoRR::CompareUeWeightsDl

Implements ns3::NrMacSchedulerTdma.

Definition at line 70 of file nr-mac-scheduler-tdma-rr.cc.

References ns3::NrMacSchedulerUeInfoRR::CompareUeWeightsDl().

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◆ GetUeCompareUlFn()

std::function< bool(const NrMacSchedulerNs3::UePtrAndBufferReq &lhs, const NrMacSchedulerNs3::UePtrAndBufferReq &rhs)> ns3::NrMacSchedulerTdmaRR::GetUeCompareUlFn ( ) const

overrideprotectedvirtual

Return the comparison function to sort UL UE according to the scheduler policy.

Returns: a pointer to NrMacSchedulerUeInfoRR::CompareUeWeightsUl

Implements ns3::NrMacSchedulerTdma.

Definition at line 77 of file nr-mac-scheduler-tdma-rr.cc.

References ns3::NrMacSchedulerUeInfoRR::CompareUeWeightsUl().

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◆ NotAssignedDlResources()

void ns3::NrMacSchedulerTdmaRR::NotAssignedDlResources	(	const UePtrAndBufferReq &	ue,
		const FTResources &	notAssigned,
		const FTResources &	totalAssigned
	)		const

inlineoverrideprotectedvirtual

Update the UE representation after a symbol (DL) has been assigned to other UE.

Parameters

ue	UE to which a symbol has not been assigned
notAssigned	the amount of resources not assigned
totalAssigned	the amount of total resources assigned until now

Implements ns3::NrMacSchedulerTdma.

Definition at line 102 of file nr-mac-scheduler-tdma-rr.h.

◆ NotAssignedUlResources()

void ns3::NrMacSchedulerTdmaRR::NotAssignedUlResources	(	const UePtrAndBufferReq &	ue,
		const FTResources &	notAssigned,
		const FTResources &	totalAssigned
	)		const

inlineoverrideprotectedvirtual

Update the UE representation after a symbol (UL) has been assigned to other UE.

Parameters

ue	UE to which a symbol has not been assigned
notAssigned	the amount of resources not assigned
totalAssigned	the amount of total resources assigned until now

Implements ns3::NrMacSchedulerTdma.

Definition at line 108 of file nr-mac-scheduler-tdma-rr.h.

The documentation for this class was generated from the following files:

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Attributes defined in parent class ns3::NrMacSchedulerNs3

Member Function Documentation

◆ AssignedDlResources()

◆ AssignedUlResources()

◆ BeforeDlSched()

◆ BeforeUlSched()

◆ CreateUeRepresentation()

◆ GetTypeId()

◆ GetUeCompareDlFn()

◆ GetUeCompareUlFn()

◆ NotAssignedDlResources()

◆ NotAssignedUlResources()