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lte: Added a fake header to RLC SM to be able to measure the layer-to-layer delay

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This commit is contained in:
Natale Patriciello
2019-03-20 18:41:46 +01:00
parent f20674cead
commit a5fa8efd13
1 changed files with 83 additions and 5 deletions
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88
src/lte/model/lte-rlc.cc
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@@ -32,6 +32,80 @@ namespace ns3 {
NS_LOG_COMPONENT_DEFINE ("LteRlc");
/**
* Tag to calculate the per-PDU delay from eNb RLC to UE RLC
*/
class RlcSmHeader : public Header
{
public:
/**
* \brief Get the type ID.
* \return the object TypeId
*/
static TypeId GetTypeId (void);
virtual TypeId GetInstanceTypeId (void) const;
/**
* Create an empty RLC tag
*/
RlcSmHeader ();
virtual void Serialize (Buffer::Iterator i) const;
virtual uint32_t Deserialize (Buffer::Iterator i);
virtual uint32_t GetSerializedSize () const;
virtual void Print (std::ostream &os) const;
};
RlcSmHeader::RlcSmHeader () : Header ()
{
// Nothing to do here
}
TypeId
RlcSmHeader::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::RlcSmTag")
.SetParent<Header> ()
.SetGroupName("Lte")
.AddConstructor<RlcSmHeader> ();
return tid;
}
TypeId
RlcSmHeader::GetInstanceTypeId (void) const
{
return GetTypeId ();
}
uint32_t
RlcSmHeader::GetSerializedSize (void) const
{
return 1;
}
void
RlcSmHeader::Serialize (Buffer::Iterator i) const
{
// Arbitrary value. It is not used anywhere.
i.WriteU8 (8U);
}
uint32_t
RlcSmHeader::Deserialize (Buffer::Iterator i)
{
uint8_t v = i.ReadU8 ();
NS_UNUSED (v);
return 1;
}
void
RlcSmHeader::Print (std::ostream &os) const
{
os << "RlcSmTag";
}
/// LteRlcSpecificLteMacSapUser class
class LteRlcSpecificLteMacSapUser : public LteMacSapUser
@@ -223,8 +297,8 @@ LteRlcSm::DoReceivePdu (LteMacSapUser::ReceivePduParameters rxPduParams)
// RLC Performance evaluation
RlcTag rlcTag;
Time delay;
NS_ASSERT_MSG (rxPduParams.p->PeekPacketTag (rlcTag), "RlcTag is missing");
rxPduParams.p->RemovePacketTag (rlcTag);
bool ret = rxPduParams.p->FindFirstMatchingByteTag (rlcTag);
NS_ASSERT_MSG (ret, "RlcTag is missing");
delay = Simulator::Now() - rlcTag.GetSenderTimestamp ();
NS_LOG_LOGIC (" RNTI=" << m_rnti
<< " LCID=" << (uint32_t) m_lcid
@@ -238,7 +312,13 @@ LteRlcSm::DoNotifyTxOpportunity (LteMacSapUser::TxOpportunityParameters txOpPara
{
NS_LOG_FUNCTION (this << txOpParams.bytes);
LteMacSapProvider::TransmitPduParameters params;
params.pdu = Create<Packet> (txOpParams.bytes);
RlcSmHeader header;
RlcTag tag (Simulator::Now ());
params.pdu = Create<Packet> (txOpParams.bytes - header.GetSerializedSize ());
params.pdu->AddHeader (header);
params.pdu->AddByteTag (tag, 1, header.GetSerializedSize ());
params.rnti = m_rnti;
params.lcid = m_lcid;
params.layer = txOpParams.layer;
@@ -246,8 +326,6 @@ LteRlcSm::DoNotifyTxOpportunity (LteMacSapUser::TxOpportunityParameters txOpPara
params.componentCarrierId = txOpParams.componentCarrierId;
// RLC Performance evaluation
RlcTag tag (Simulator::Now());
params.pdu->AddPacketTag (tag);
NS_LOG_LOGIC (" RNTI=" << m_rnti
<< " LCID=" << (uint32_t) m_lcid
<< " size=" << txOpParams.bytes);