A Discrete-Event Network Simulator
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lte-rlc-header.cc
Go to the documentation of this file.
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/*
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* Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Manuel Requena <manuel.requena@cttc.es>
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*/
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#include "
lte-rlc-header.h
"
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#include "ns3/log.h"
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namespace
ns3
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{
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NS_LOG_COMPONENT_DEFINE
(
"LteRlcHeader"
);
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NS_OBJECT_ENSURE_REGISTERED
(LteRlcHeader);
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LteRlcHeader::LteRlcHeader
()
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: m_headerLength(0),
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m_framingInfo(0xff),
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m_sequenceNumber(0xfffa)
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{
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}
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LteRlcHeader::~LteRlcHeader
()
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{
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m_headerLength
= 0;
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m_framingInfo
= 0xff;
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m_sequenceNumber
= 0xfffb;
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}
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void
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LteRlcHeader::SetFramingInfo
(uint8_t framingInfo)
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{
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m_framingInfo
= framingInfo & 0x03;
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}
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void
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LteRlcHeader::SetSequenceNumber
(
SequenceNumber10
sequenceNumber)
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{
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m_sequenceNumber
= sequenceNumber;
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}
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uint8_t
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LteRlcHeader::GetFramingInfo
()
const
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{
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return
m_framingInfo
;
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}
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SequenceNumber10
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LteRlcHeader::GetSequenceNumber
()
const
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{
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return
m_sequenceNumber
;
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}
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void
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LteRlcHeader::PushExtensionBit
(uint8_t extensionBit)
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{
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m_extensionBits
.push_back(extensionBit);
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if
(
m_extensionBits
.size() == 1)
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{
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m_headerLength
= 2;
// Only fixed part
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}
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else
if
(
m_extensionBits
.size() % 2)
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{
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m_headerLength
+= 1;
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}
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else
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{
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m_headerLength
+= 2;
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}
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}
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void
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LteRlcHeader::PushLengthIndicator
(uint16_t lengthIndicator)
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{
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m_lengthIndicators
.push_back(lengthIndicator);
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}
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uint8_t
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LteRlcHeader::PopExtensionBit
()
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{
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uint8_t extensionBit =
m_extensionBits
.front();
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m_extensionBits
.pop_front();
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return
extensionBit;
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}
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uint16_t
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LteRlcHeader::PopLengthIndicator
()
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{
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uint16_t lengthIndicator =
m_lengthIndicators
.front();
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m_lengthIndicators
.pop_front();
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return
lengthIndicator;
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}
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TypeId
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LteRlcHeader::GetTypeId
()
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{
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static
TypeId
tid =
TypeId
(
"ns3::LteRlcHeader"
)
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.
SetParent
<
Header
>()
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.SetGroupName(
"Lte"
)
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.AddConstructor<
LteRlcHeader
>();
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return
tid;
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}
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TypeId
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LteRlcHeader::GetInstanceTypeId
()
const
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{
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return
GetTypeId
();
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}
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void
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LteRlcHeader::Print
(std::ostream& os)
const
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{
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auto
it1 =
m_extensionBits
.begin();
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auto
it2 =
m_lengthIndicators
.begin();
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os <<
"Len="
<<
m_headerLength
;
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os <<
" FI="
<< (uint16_t)
m_framingInfo
;
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os <<
" E="
<< (uint16_t)(*it1);
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os <<
" SN="
<<
m_sequenceNumber
;
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it1++;
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if
(it1 !=
m_extensionBits
.end())
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{
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os <<
" E="
;
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}
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while
(it1 !=
m_extensionBits
.end())
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{
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os << (uint16_t)(*it1);
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it1++;
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}
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if
(it2 !=
m_lengthIndicators
.end())
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{
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os <<
" LI="
;
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}
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while
(it2 !=
m_lengthIndicators
.end())
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{
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os << (uint16_t)(*it2) <<
" "
;
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it2++;
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}
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}
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uint32_t
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LteRlcHeader::GetSerializedSize
()
const
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{
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return
m_headerLength
;
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}
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void
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LteRlcHeader::Serialize
(
Buffer::Iterator
start)
const
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{
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Buffer::Iterator
i = start;
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auto
it1 =
m_extensionBits
.begin();
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auto
it2 =
m_lengthIndicators
.begin();
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i.
WriteU8
(((
m_framingInfo
<< 3) & 0x18) | (((*it1) << 2) & 0x04) |
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((
m_sequenceNumber
.
GetValue
() >> 8) & 0x0003));
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i.
WriteU8
(
m_sequenceNumber
.
GetValue
() & 0x00FF);
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it1++;
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while
(it1 !=
m_extensionBits
.end() && it2 !=
m_lengthIndicators
.end())
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{
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uint16_t oddLi;
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uint16_t evenLi;
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uint8_t oddE;
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uint8_t evenE;
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oddE = *it1;
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oddLi = *it2;
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it1++;
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it2++;
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if
(it1 !=
m_extensionBits
.end() && it2 !=
m_lengthIndicators
.end())
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{
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evenE = *it1;
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evenLi = *it2;
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i.
WriteU8
(((oddE << 7) & 0x80) | ((oddLi >> 4) & 0x007F));
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i.
WriteU8
(((oddLi << 4) & 0x00F0) | ((evenE << 3) & 0x08) | ((evenLi >> 8) & 0x0007));
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i.
WriteU8
(evenLi & 0x00FF);
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it1++;
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it2++;
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}
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else
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{
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i.
WriteU8
(((oddE << 7) & 0x80) | ((oddLi >> 4) & 0x007F));
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i.
WriteU8
((oddLi << 4) & 0x00F0);
// Padding is implicit
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}
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}
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}
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uint32_t
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LteRlcHeader::Deserialize
(
Buffer::Iterator
start)
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{
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Buffer::Iterator
i = start;
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uint8_t byte_1;
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uint8_t byte_2;
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uint8_t byte_3;
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uint8_t extensionBit;
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byte_1 = i.
ReadU8
();
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byte_2 = i.
ReadU8
();
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m_headerLength
= 2;
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m_framingInfo
= (byte_1 & 0x18) >> 3;
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m_sequenceNumber
= ((byte_1 & 0x03) << 8) | byte_2;
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extensionBit = (byte_1 & 0x04) >> 2;
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m_extensionBits
.push_back(extensionBit);
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if
(extensionBit ==
DATA_FIELD_FOLLOWS
)
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{
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return
GetSerializedSize
();
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}
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uint16_t oddLi;
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uint16_t evenLi;
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uint8_t oddE;
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uint8_t evenE;
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bool
moreLiFields = (extensionBit ==
E_LI_FIELDS_FOLLOWS
);
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while
(moreLiFields)
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{
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byte_1 = i.
ReadU8
();
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byte_2 = i.
ReadU8
();
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oddE = (byte_1 & 0x80) >> 7;
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oddLi = ((byte_1 & 0x7F) << 4) | ((byte_2 & 0xF0) >> 4);
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moreLiFields = (oddE ==
E_LI_FIELDS_FOLLOWS
);
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m_extensionBits
.push_back(oddE);
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m_lengthIndicators
.push_back(oddLi);
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m_headerLength
+= 2;
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if
(moreLiFields)
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{
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byte_3 = i.
ReadU8
();
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evenE = (byte_2 & 0x08) >> 3;
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evenLi = ((byte_2 & 0x07) << 8) | (byte_3 & 0xFF);
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moreLiFields = (evenE ==
E_LI_FIELDS_FOLLOWS
);
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m_extensionBits
.push_back(evenE);
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m_lengthIndicators
.push_back(evenLi);
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m_headerLength
+= 1;
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}
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}
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return
GetSerializedSize
();
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}
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};
// namespace ns3
ns3::Buffer::Iterator
iterator in a Buffer instance
Definition
buffer.h:89
ns3::Buffer::Iterator::ReadU8
uint8_t ReadU8()
Definition
buffer.h:1016
ns3::Buffer::Iterator::WriteU8
void WriteU8(uint8_t data)
Definition
buffer.h:870
ns3::Header
Protocol header serialization and deserialization.
Definition
header.h:33
ns3::LteRlcHeader
The packet header for the Radio Link Control (RLC) protocol packets.
Definition
lte-rlc-header.h:30
ns3::LteRlcHeader::Serialize
void Serialize(Buffer::Iterator start) const override
Definition
lte-rlc-header.cc:156
ns3::LteRlcHeader::m_framingInfo
uint8_t m_framingInfo
2 bits
Definition
lte-rlc-header.h:121
ns3::LteRlcHeader::m_extensionBits
std::list< uint8_t > m_extensionBits
Includes extensionBit of the fixed part.
Definition
lte-rlc-header.h:124
ns3::LteRlcHeader::GetSerializedSize
uint32_t GetSerializedSize() const override
Definition
lte-rlc-header.cc:150
ns3::LteRlcHeader::PushExtensionBit
void PushExtensionBit(uint8_t extensionBit)
Push extension bit.
Definition
lte-rlc-header.cc:59
ns3::LteRlcHeader::m_sequenceNumber
SequenceNumber10 m_sequenceNumber
sequence number
Definition
lte-rlc-header.h:122
ns3::LteRlcHeader::Print
void Print(std::ostream &os) const override
Definition
lte-rlc-header.cc:117
ns3::LteRlcHeader::DATA_FIELD_FOLLOWS
@ DATA_FIELD_FOLLOWS
Definition
lte-rlc-header.h:95
ns3::LteRlcHeader::E_LI_FIELDS_FOLLOWS
@ E_LI_FIELDS_FOLLOWS
Definition
lte-rlc-header.h:96
ns3::LteRlcHeader::GetSequenceNumber
SequenceNumber10 GetSequenceNumber() const
Get sequence number.
Definition
lte-rlc-header.cc:53
ns3::LteRlcHeader::m_headerLength
uint16_t m_headerLength
header length
Definition
lte-rlc-header.h:120
ns3::LteRlcHeader::SetSequenceNumber
void SetSequenceNumber(SequenceNumber10 sequenceNumber)
Set sequence number.
Definition
lte-rlc-header.cc:41
ns3::LteRlcHeader::GetInstanceTypeId
TypeId GetInstanceTypeId() const override
Get the most derived TypeId for this Object.
Definition
lte-rlc-header.cc:111
ns3::LteRlcHeader::SetFramingInfo
void SetFramingInfo(uint8_t framingInfo)
Set framing info.
Definition
lte-rlc-header.cc:35
ns3::LteRlcHeader::m_lengthIndicators
std::list< uint16_t > m_lengthIndicators
length indicators
Definition
lte-rlc-header.h:125
ns3::LteRlcHeader::Deserialize
uint32_t Deserialize(Buffer::Iterator start) override
Definition
lte-rlc-header.cc:202
ns3::LteRlcHeader::PopExtensionBit
uint8_t PopExtensionBit()
Pop extension bit.
Definition
lte-rlc-header.cc:83
ns3::LteRlcHeader::~LteRlcHeader
~LteRlcHeader() override
Definition
lte-rlc-header.cc:27
ns3::LteRlcHeader::LteRlcHeader
LteRlcHeader()
Constructor.
Definition
lte-rlc-header.cc:20
ns3::LteRlcHeader::PopLengthIndicator
uint16_t PopLengthIndicator()
Pop length indicator.
Definition
lte-rlc-header.cc:92
ns3::LteRlcHeader::GetTypeId
static TypeId GetTypeId()
Get the type ID.
Definition
lte-rlc-header.cc:101
ns3::LteRlcHeader::GetFramingInfo
uint8_t GetFramingInfo() const
Get framing info.
Definition
lte-rlc-header.cc:47
ns3::LteRlcHeader::PushLengthIndicator
void PushLengthIndicator(uint16_t lengthIndicator)
Push length indicator.
Definition
lte-rlc-header.cc:77
ns3::SequenceNumber10
SequenceNumber10 class.
Definition
lte-rlc-sequence-number.h:23
ns3::SequenceNumber10::GetValue
uint16_t GetValue() const
Extracts the numeric value of the sequence number.
Definition
lte-rlc-sequence-number.h:69
ns3::TypeId
a unique identifier for an interface.
Definition
type-id.h:48
ns3::TypeId::SetParent
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition
type-id.cc:1001
uint32_t
NS_LOG_COMPONENT_DEFINE
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition
log.h:191
NS_OBJECT_ENSURE_REGISTERED
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition
object-base.h:35
lte-rlc-header.h
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
src
lte
model
lte-rlc-header.cc
Generated on Fri Dec 13 2024 09:20:44 for ns-3 by
1.11.0