LteMacUe¶

compound module LteMacUe

Extends the LteMacBase module by providing specific MAC functions at the User Equipment (UE) side. For uplink connections, this module manages the initiation of the Random Access procedure (RAC) and the sending of Buffer Status Reports (BSRs) to the eNodeBs. Once it receives an uplink scheduling grant from the eNodeB, it is responsible for managing the local connections’ scheduler and constructing MAC Protocol Data Units (PDUs) to be transmitted to the physical layer.

Inheritance diagram¶

Known subclasses¶

Name	Type	Description
LteMacUeD2D	compound module	Extends LTE MAC functionalities at the User Equipment side to support device-to-device (D2D) communications. Specifically, it customizes LteMacUe functionalities to support the transmission and reception of MAC Protocol Data Units (PDUs), Channel Status Information (CSI), and Buffer Status Reports (BSRs) over a D2D link. It supports D2D multicast transmission to nearby UEs belonging to a given multicast group.
NrMacUe	compound module	Provides functionalities for the Medium Access Control (MAC) of the New Radio (NR) protocol stack at the User Equipment (UE) side. In particular, it extends the LteMacUe module by redefining functions to support different numerology parameterizations.

Extends¶

Name	Type	Description
LteMacBase	compound module	Base module for the Medium Access Control (MAC) layer of the LTE protocol stack.

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
isNr	bool	false	True for the NR leg (set by NrNicUe on the nrMac submodule)
collectorModule	string	“”
numPreambles	int	64	Number of RACH preambles available for contention-based random access
maxRacAttempts	int	10	preambleTransMax; max RAC attempts (0 = give up after first failure)
racBackoffMin	int	0	Min random backoff (TTIs) after failed RAC
racBackoffMax	int	20	Max random backoff (TTIs) after failed RAC (0 = no backoff, instant retry)
raResponseWindow	int	3	ra-ResponseWindow: TTIs to wait before retrying RAC
retxBsrTimer	int	40	retxBSR-Timer: BSR retransmission timer (TTIs; 0 = disabled)

Properties¶

Name	Value	Description
class	LteMacUe
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
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
macBufferOverFlowDl
macBufferOverFlowUl
macCellPacketLossDl
macCellPacketLossUl
macDelayDl
macDelayUl
macPacketLossDl
macPacketLossUl
macPduAcked
macPduDiscarded
macThroughputDl
macThroughputUl
receivedPacketFromLowerLayer
receivedPacketFromUpperLayer
rlcPduDiscarded
sentPacketToLowerLayer
sentPacketToUpperLayer
ulMacPduArrived

Statistics¶

Name	Title	Source	Record	Unit	Interpolation Mode
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
macBufferOverFlowDl	Mac buffer overflow as function of time	macBufferOverFlowDl	mean	Byte/s
macBufferOverFlowUl	Mac buffer overflow as function of time	macBufferOverFlowUl	mean	Byte/s
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 the ~LteMacBase module by providing specific MAC functions
// at the User Equipment (UE) side.
// For uplink connections, this module manages the initiation of the Random Access procedure (RAC)
// and the sending of Buffer Status Reports (BSRs) to the eNodeBs. Once it receives an uplink scheduling
// grant from the eNodeB, it is responsible for managing the local connections' scheduler and
// constructing MAC Protocol Data Units (PDUs) to be transmitted to the physical layer.
//
module LteMacUe extends LteMacBase
{
    parameters:
        @class("LteMacUe");
        bool isNr = default(false);            // True for the NR leg (set by NrNicUe on the nrMac submodule)
        string collectorModule = default("");

        int numPreambles = default(64);        // Number of RACH preambles available for contention-based random access
        int maxRacAttempts = default(10);      // preambleTransMax; max RAC attempts (0 = give up after first failure)
        int racBackoffMin = default(0);        // Min random backoff (TTIs) after failed RAC
        int racBackoffMax = default(20);       // Max random backoff (TTIs) after failed RAC (0 = no backoff, instant retry)
        int raResponseWindow = default(3);     // ra-ResponseWindow: TTIs to wait before retrying RAC
        int retxBsrTimer = default(40);        // retxBSR-Timer: BSR retransmission timer (TTIs; 0 = disabled)
}

File: src/simu5g/stack/mac/LteMacUe.ned