LteHarqUnitTx Class Reference¶
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Simu5G
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#include <LteHarqUnitTx.h>
Public Member Functions | |
| LteHarqUnitTx (Binder *binder, unsigned char acid, Codeword cw, LteMacBase *macOwner, LteMacBase *dstMac) | |
| virtual void | insertPdu (Packet *pdu) |
| virtual void | markSelected () |
| virtual Packet * | extractPdu () |
| virtual bool | pduFeedback (HarqAcknowledgment fb) |
| virtual bool | isEmpty () |
| virtual bool | isReady () |
| virtual bool | selfNack () |
| virtual void | dropPdu () |
Protected Attributes | |
| Packet * | pdu_ = nullptr |
| Carried sub-burst. | |
| long | pduId_ = -1 |
| Omnet ID of the pdu. | |
| int64_t | pduLength_ |
| PDU size in bytes. | |
| Codeword | cw_ |
| H-ARQ codeword identifier. | |
| unsigned char | transmissions_ = 0 |
| Number of (re)transmissions for current pdu (N.B.: values are 1,2,3,4) | |
| simtime_t | txTime_ |
| TTI at which the pdu has been transmitted. | |
Detailed Description
An LteHarqUnit is an HARQ mac pdu container, a harqBuffer is made of harq processes which are made of harq units.
LteHarqUnit manages transmissions and retransmissions. Contained PDU may be in one of four statuses:
IDLE PDU READY
TXHARQ_PDU_BUFFERED: no present locally ready for rtx TXHARQ_PDU_WAITING: no copy present not ready for tx TXHARQ_PDU_EMPTY: yes not present not ready for tx TXHARQ_PDU_SELECTED: no present will be tx
Constructor & Destructor Documentation
◆ LteHarqUnitTx()
| LteHarqUnitTx | ( | Binder * | binder, |
| unsigned char | acid, | ||
| Codeword | cw, | ||
| LteMacBase * | macOwner, | ||
| LteMacBase * | dstMac ) |
Constructor.
- Parameters
-
id unit identifier
Member Function Documentation
◆ insertPdu()
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virtual |
Inserts a pdu in this harq unit.
When a new pdu is inserted into an H-ARQ unit, its status is TX_HARQ_PDU_SELECTED, so it will be extracted and sent at this same TTI.
- Parameters
-
pdu MacPdu to be inserted
◆ markSelected()
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virtual |
Transition from BUFFERED to SELECTED status: the pdu will be extracted when the buffer is inspected.
◆ extractPdu()
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virtual |
Returns the macPdu to be sent and increments transmissions_ counter.
The H-ARQ process containing this unit must call this method in order to extract the pdu the Mac layer will send. Before extraction, control info is updated with transmission counter and ndi.
Reimplemented in LteHarqUnitTxD2D.
◆ pduFeedback()
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virtual |
Manages ACK/NACK.
- Parameters
-
fb ACK or NACK for this H-ARQ unit
- Returns
- true if the unit has become empty, false if it is still busy
Reimplemented in LteHarqUnitTxD2D.
◆ isEmpty()
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virtual |
Tells if this unit is currently managing a pdu or not.
◆ isReady()
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virtual |
Tells if the PDU is ready for retransmission (the pdu can then be marked to be sent)
◆ selfNack()
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virtual |
If, after evaluating the pdu, it cannot be retransmitted because there isn't enough frame space, a selfNack can be issued to advance the unit status. This avoids a large pdu that cannot be retransmitted (because the channel changed), from locking an H-ARQ unit indefinitely. Must simulate selection, extraction and nack reception. N.B.: txTime is also updated so firstReadyForRtx returns a different pdu
- Returns
- true if the unit reset as a result of self nack, false otherwise
◆ dropPdu()
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virtual |
Resets unit but throws an error if the unit is not in BUFFERED state.
Member Data Documentation
◆ pdu_
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protected |
Carried sub-burst.
◆ pduId_
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protected |
Omnet ID of the pdu.
◆ pduLength_
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protected |
PDU size in bytes.
◆ cw_
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protected |
H-ARQ codeword identifier.
◆ transmissions_
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protected |
Number of (re)transmissions for current pdu (N.B.: values are 1,2,3,4)
◆ txTime_
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protected |
TTI at which the pdu has been transmitted.
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