LteMacEnbD2D¶

compound module LteMacEnbD2D

Extends LTE MAC functionalities at the eNodeB side to support device-to-device (D2D) communications. Specifically, it enhances resource allocation procedures to enable direct communication between User Equipments (UEs), i.e., it allocates resources for D2D transmissions. Network-assisted D2D is only implemented (out-of-coverage D2D is not supported).

Inheritance diagram¶

Extends¶

Name	Type	Description
LteMacEnb	compound module	Extends the LteMacBase module by providing specific MAC functions on the eNodeB side. Specifically, it initializes and manages the scheduling classes responsible for resource allocation operations in both uplink and downlink directions, while also supporting Carrier Aggregation (CA). It manages the Random Access procedure (RAC) and the reception of Buffer Status Reports (BSRs) from UEs, as well as the transmission of scheduling grants to UEs allocated within the uplink bandwidth. For downlink connections, it notifies the Radio Link Control (RLC) layer when it is ready to receive MAC Service Data Units (SDUs) to build MAC Protocol Data Units (PDUs) and transmit them to the physical layer.

Parameters¶

Name	Type	Default value	Description
macNodeId	int		MacNodeId of the stack leg this MAC belongs to (set by the NIC)
binderModule	string	“binder”
queueSize	int	2MiB	MAC Buffers queue size
harqProcesses	int	8
maxHarqRtx	int	3
harqFbEvaluationTimer	int	4	Number of slots for sending back HARQ FB
statDisplay	bool	false
rlcMuxModule	string	“^.rlcMux”	Module references for accessing other stack layers
bearerManagementModule	string	“^.rrc.bearerManagement”
amcType	string	“LteAmcD2D”	AMC Type: “LteAmc”, “NrAmc” (the D2D NICs swap in the “LteAmcD2D”/”NrAmcD2D” leaves)
amcMode	string	“AUTO”	AMC pilot mode; supported values depend on the AMC implementation (LteAmc: “AUTO”, “D2D”)
rbAllocationType	string	“localized”	Resource allocation type (“distributed” or “localized”)
summaryLowerBound	double	5ms	Summary feedback confidence function lower bound
summaryUpperBound	double	20ms	Summary feedback confidence function upper bound
fbhbCapacityDl	int	5	Feedback historical base capacity in DL (number of stored feedback samples per UE)
fbhbCapacityUl	int	5	Feedback historical base capacity in UL (number of stored feedback samples per UE)
cqiWeight	double	0.0	Wideband CQI generation parameter (0.0 means “use the mean value”)
eNodeBCount	int	0	Number of eNodeBs - set to 0 if unknown
schedulingDisciplineDl	string	“MAXCI”	Scheduling discipline. See LteCommon.h for discipline meaning. ALLOCATOR_BESTFIT is the D2D frequency-reuse allocator: it is only constructible by the D2D uplink schedulers, so selecting it requires ulSchedulerType = LteSchedulerEnbUlD2D or NrSchedulerGnbUlD2D (and hence the Simu5G_D2D feature). Any other scheduler raises an error at setup.
schedulingDisciplineUl	string	“MAXCI”
ulSchedulerType	string	“LteSchedulerEnbUlD2D”	Scheduler Types
dlSchedulerType	string	“LteSchedulerEnbDl”
pfAlpha	double	0.95	Proportional Fair parameters
pilotMode	string	“ROBUST_CQI”
numPreambles	int	64	Number of RACH preambles available for contention-based random access
cellInfoModule	string
d2dBinderModule	string	“d2dBinder”	The network’s D2dBinder, which holds the D2D state
connectionControlModule	string	“^.rrc.connectionControl”	The node’s control-plane entry point, which knows the UEs handing over
fbhbCapacityD2D	int	5	Feedback historical base capacity in D2D (number of stored feedback samples per UE)
usePreconfiguredTxParams	bool	false
d2dCqi	int	7
reuseD2D	bool	false	Frequency reuse parameters
reuseD2DMulti	bool	false
conflictGraphUpdatePeriod	double	1s
conflictGraphThreshold	double	90	dBm
conflictGraphD2DInterferenceRadius	double	-1.0m	Meters
conflictGraphD2DMultiTxRadius	double	-1.0m	Meters
conflictGraphD2DMultiInterferenceRadius	double	-1.0m	Meters
msHarqInterrupt	bool	true	Handling of D2D mode switch
msClearRlcBuffer	bool	true

Properties¶

Name	Value	Description
class	LteMacEnbD2D
display	i=block/mac

Gates¶

Name	Direction	Description
upperLayerIn	input	From RLC
upperLayerOut	output	To RLC
phyIn	input	From PHY
phyOut	output	To PHY

Signals¶

Name	Type	Unit	Description
avgServedBlocksDl
avgServedBlocksUl
grantSent
harqErrorRate_1st_Dl
harqErrorRate_1st_Ul
harqErrorRate_2nd_Dl
harqErrorRate_2nd_Ul
harqErrorRate_3rd_Dl
harqErrorRate_3rd_Ul
harqErrorRate_4th_Dl
harqErrorRate_4th_Ul
harqErrorRateDl
harqErrorRateUl
harqTxAttemptsDl
harqTxAttemptsUl
macBufferOverFlowD2D
macBufferOverFlowDl
macBufferOverFlowUl
macCellPacketLossD2D
macCellPacketLossDl
macCellPacketLossUl
macDelayDl
macDelayUl
macPacketLossDl
macPacketLossUl
macPduAcked
macPduDiscarded
macThroughputDl
macThroughputUl
receivedPacketFromLowerLayer
receivedPacketFromUpperLayer
rlcPduDiscarded
sentPacketToLowerLayer
sentPacketToUpperLayer
ulMacPduArrived

Statistics¶

Name	Title	Source	Record	Unit	Interpolation Mode
avgServedBlocksDl	Average number of allocated Resource Blocks in the Dl	avgServedBlocksDl	mean,vector	blocks
avgServedBlocksUl	Average number of allocated Resource Blocks in the Dl	avgServedBlocksUl	mean,vector	blocks
harqErrorRate_1st_Dl	Harq Error Rate Dl (1st tx)	harqErrorRate_1st_Dl	mean,vector
harqErrorRate_1st_Ul	Harq Error Rate Ul (1st tx)	harqErrorRate_1st_Ul	mean,vector
harqErrorRate_2nd_Dl	Harq Error Rate Dl (2nd tx)	harqErrorRate_2nd_Dl	mean,vector
harqErrorRate_2nd_Ul	Harq Error Rate Ul (2nd tx)	harqErrorRate_2nd_Ul	mean,vector
harqErrorRate_3rd_Dl	Harq Error Rate Dl (3rd tx)	harqErrorRate_3rd_Dl	mean,vector
harqErrorRate_3rd_Ul	Harq Error Rate Ul (3rd tx)	harqErrorRate_3rd_Ul	mean,vector
harqErrorRate_4th_Dl	Harq Error Rate Dl (4th tx)	harqErrorRate_4th_Dl	mean,vector
harqErrorRate_4th_Ul	Harq Error Rate Ul (4th tx)	harqErrorRate_4th_Ul	mean,vector
harqErrorRateDl	Harq Error Rate Dl	harqErrorRateDl	mean,vector
harqErrorRateUl	Harq Error Rate Ul	harqErrorRateUl	mean,vector
harqTxAttemptsDl	Harq Tx Attempts Dl	harqTxAttemptsDl	mean,vector
harqTxAttemptsUl	Harq Tx Attempts Ul	harqTxAttemptsUl	mean,vector
macBufferOverFlowD2D	Mac buffer overflow as function of time	macBufferOverFlowD2D	mean	Byte/s
macBufferOverFlowDl	Mac buffer overflow as function of time	macBufferOverFlowDl	mean	Byte/s
macBufferOverFlowUl	Mac buffer overflow as function of time	macBufferOverFlowUl	mean	Byte/s
macCellPacketLossD2D	Mac Cell Packet Loss D2D	macCellPacketLossD2D	mean
macCellPacketLossDl	Mac Cell Packet Loss Dl	macCellPacketLossDl	mean
macCellPacketLossUl	Mac Cell Packet Loss Ul	macCellPacketLossUl	mean
macDelayDl	Delay at the MAC layer UL	macDelayDl	mean,vector	s
macDelayUl	Delay at the MAC layer UL	macDelayUl	mean,vector	s
macPacketLossDl	Mac Packet Loss Dl	macPacketLossDl	mean
macPacketLossUl	Mac Packet Loss Ul	macPacketLossUl	mean
macThroughputDl	Throughput at the MAC layer DL	macThroughputDl	simu5g_rateavg	Bps
macThroughputUl	Throughput at the MAC layer UL	macThroughputUl	simu5g_rateavg	Bps
receivedPacketFromLowerLayer		receivedPacketFromLowerLayer	count,”sum(packetBytes)”,”vector(packetBytes)”		none
receivedPacketFromUpperLayer		receivedPacketFromUpperLayer	count,”sum(packetBytes)”,”vector(packetBytes)”		none
sentPacketToLowerLayer		sentPacketToLowerLayer	count,”sum(packetBytes)”,”vector(packetBytes)”		none
sentPacketToUpperLayer		sentPacketToUpperLayer	count,”sum(packetBytes)”,”vector(packetBytes)”		none

Source code¶

//
// Extends LTE MAC functionalities at the eNodeB side to support device-to-device (D2D)
// communications. Specifically, it enhances resource allocation procedures to enable direct
// communication between User Equipments (UEs), i.e., it allocates resources for D2D transmissions.
// Network-assisted D2D is only implemented (out-of-coverage D2D is not supported).
//
module LteMacEnbD2D extends LteMacEnb
{
    parameters:
        @class("LteMacEnbD2D");
        string d2dBinderModule = default("d2dBinder");  // The network's ~D2dBinder, which holds the D2D state
        string connectionControlModule = default("^.rrc.connectionControl");  // The node's control-plane entry point, which knows the UEs handing over

        // Use the D2D-capable AMC leaf
        amcType = default("LteAmcD2D");

        // Use the D2D-capable uplink scheduler leaf
        ulSchedulerType = default("LteSchedulerEnbUlD2D");

        // Feedback historical base capacity in D2D (number of stored feedback samples per UE)
        int fbhbCapacityD2D = default(5);

        bool usePreconfiguredTxParams = default(false);
        int d2dCqi = default(7);

        // Frequency reuse parameters
        bool reuseD2D = default(false);
        bool reuseD2DMulti = default(false);
        double conflictGraphUpdatePeriod @unit(s) = default(1s);

        // CG thresholds can be defined in either dBm or meters
        // if distances are set to -1.0, then dBm thresholds are used,
        // otherwise distances have priority on dBm thresholds
        double conflictGraphThreshold = default(90);                       // dBm
        double conflictGraphD2DInterferenceRadius @unit(m) = default(-1.0m);         // Meters
        double conflictGraphD2DMultiTxRadius @unit(m) = default(-1.0m);              // Meters
        double conflictGraphD2DMultiInterferenceRadius @unit(m) = default(-1.0m);    // Meters

        // Handling of D2D mode switch
        bool msHarqInterrupt = default(true);
        bool msClearRlcBuffer = default(true);

        @signal[macCellPacketLossD2D];
        @statistic[macCellPacketLossD2D](title="Mac Cell Packet Loss D2D"; unit=""; source="macCellPacketLossD2D"; record=mean);
        @signal[macBufferOverFlowD2D];
        @statistic[macBufferOverFlowD2D](title="Mac buffer overflow as function of time"; unit="Byte/s"; source="macBufferOverFlowD2D"; record=mean);
}

File: src/simu5g/stack/d2d/mac/LteMacEnbD2D.ned