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RLC header

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This commit is contained in:
Manuel Requena
2011-09-07 15:49:37 +02:00
parent dc9cda21b9
commit bef9f65167
2 changed files with 353 additions and 0 deletions
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256
src/lte/model/lte-rlc-header.cc Normal file
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Manuel Requena <manuel.requena@cttc.es>
*/
#include "ns3/log.h"
#include "ns3/lte-rlc-header.h"
NS_LOG_COMPONENT_DEFINE ("LteRlcHeader");
namespace ns3 {
NS_OBJECT_ENSURE_REGISTERED (LteRlcHeader);
LteRlcHeader::LteRlcHeader ()
: m_headerLength (0),
m_framingInfo (0xff),
m_sequenceNumber (0xfffa)
{
}
LteRlcHeader::~LteRlcHeader ()
{
m_headerLength = 0;
m_framingInfo = 0xff;
m_sequenceNumber = 0xfffb;
}
void
LteRlcHeader::SetFramingInfo (uint8_t framingInfo)
{
m_framingInfo = framingInfo & 0x03;
}
void
LteRlcHeader::SetSequenceNumber (uint16_t sequenceNumber)
{
m_sequenceNumber = sequenceNumber & 0x03FF;
}
uint8_t
LteRlcHeader::GetFramingInfo () const
{
return m_framingInfo;
}
uint16_t
LteRlcHeader::GetSequenceNumber () const
{
return m_sequenceNumber;
}
void
LteRlcHeader::PushExtensionBit (uint8_t extensionBit)
{
m_extensionBits.push_back (extensionBit);
if (m_extensionBits.size() == 1)
{
m_headerLength = 2; // Only fixed part
}
else if (m_extensionBits.size() % 2)
{
m_headerLength += 1;
}
else
{
m_headerLength += 2;
}
}
void
LteRlcHeader::PushLengthIndicator (uint16_t lengthIndicator)
{
m_lengthIndicators.push_back (lengthIndicator);
}
uint8_t
LteRlcHeader::PopExtensionBit (void)
{
uint8_t extensionBit = m_extensionBits.front ();
m_extensionBits.pop_front ();
return extensionBit;
}
uint16_t
LteRlcHeader::PopLengthIndicator (void)
{
uint16_t lengthIndicator = m_lengthIndicators.front ();
m_lengthIndicators.pop_front ();
return lengthIndicator;
}
TypeId
LteRlcHeader::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::LteRlcHeader")
.SetParent<Header> ()
.AddConstructor<LteRlcHeader> ()
;
return tid;
}
TypeId
LteRlcHeader::GetInstanceTypeId (void) const
{
return GetTypeId ();
}
void LteRlcHeader::Print (std::ostream &os) const
{
std::list <uint8_t>::const_iterator it1 = m_extensionBits.begin ();
std::list <uint16_t>::const_iterator it2 = m_lengthIndicators.begin ();
uint16_t i = 1;
os << "Len=" << m_headerLength;
os << " FI=" << (uint16_t)m_framingInfo;
os << " E=" << (uint16_t)(*it1);
os << " SN=" << m_sequenceNumber;
for (it1++; *it1 && *it2; i++, it1++, it2++)
{
os << " E(" << i << ")=" << (uint16_t)(*it1);
os << " LI(" << i << ")=" << (uint16_t)(*it2);
}
}
uint32_t LteRlcHeader::GetSerializedSize (void) const
{
return m_headerLength;
}
void LteRlcHeader::Serialize (Buffer::Iterator start) const
{
Buffer::Iterator i = start;
std::list <uint8_t>::const_iterator it1 = m_extensionBits.begin ();
std::list <uint16_t>::const_iterator it2 = m_lengthIndicators.begin ();
i.WriteU8 ( ((m_framingInfo << 3) & 0x18) |
(((*it1) << 2) & 0x04) |
((m_sequenceNumber >> 8) & 0x0003) );
i.WriteU8 ( m_sequenceNumber & 0x00FF );
it1++;
while ( it1 != m_extensionBits.end () &&
it2 != m_lengthIndicators.end () )
{
uint16_t oddLi, evenLi;
uint8_t oddE, evenE;
oddE = *it1;
oddLi = *it2;
it1++;
it2++;
if ( it1 != m_extensionBits.end () &&
it2 != m_lengthIndicators.end () )
{
evenE = *it1;
evenLi = *it2;
i.WriteU8 ( ((oddE << 7) & 0x80) | ((oddLi >> 4) & 0x007F) );
i.WriteU8 ( ((oddLi << 4) & 0x00F0) | ((evenE << 3) & 0x08) | ((evenLi >> 8) & 0x0007) );
i.WriteU8 ( evenLi & 0x00FF );
it1++;
it2++;
}
else
{
i.WriteU8 ( ((oddE << 7) & 0x80) | ((oddLi >> 4) & 0x007F) );
i.WriteU8 ( ((oddLi << 4) & 0x00F0) ); // Padding is implicit
}
}
}
uint32_t LteRlcHeader::Deserialize (Buffer::Iterator start)
{
Buffer::Iterator i = start;
uint8_t byte_1;
uint8_t byte_2;
uint8_t byte_3;
uint8_t extensionBit;
byte_1 = i.ReadU8 ();
byte_2 = i.ReadU8 ();
m_headerLength = 2;
m_framingInfo = (byte_1 & 0x18) >> 3;
m_sequenceNumber = ((byte_1 & 0x03) << 8) | byte_2;
extensionBit = (byte_1 & 0x04) >> 2;
m_extensionBits.push_back (extensionBit);
if (extensionBit == DATA_FIELD_FOLLOWS)
{
return GetSerializedSize ();
}
uint16_t oddLi, evenLi;
uint8_t oddE, evenE;
bool moreLiFields = (extensionBit == E_LI_FIELDS_FOLLOWS);
while (moreLiFields)
{
byte_1 = i.ReadU8 ();
byte_2 = i.ReadU8 ();
oddE = (byte_1 & 0x80) >> 7;
oddLi = ((byte_1 & 0x7F) << 4) | ((byte_2 & 0xF0) >> 4);
moreLiFields = (oddE == E_LI_FIELDS_FOLLOWS);
m_extensionBits.push_back (oddE);
m_lengthIndicators.push_back (oddLi);
m_headerLength += 2;
if (moreLiFields)
{
byte_3 = i.ReadU8 ();
evenE = (byte_2 & 0x08) >> 3;
evenLi = ((byte_2 & 0x07) << 8) | (byte_3 & 0xFF);
moreLiFields = (evenE == E_LI_FIELDS_FOLLOWS);
m_extensionBits.push_back (evenE);
m_lengthIndicators.push_back (evenLi);
m_headerLength += 1;
}
}
return GetSerializedSize ();
}
}; // namespace ns3

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src/lte/model/lte-rlc-header.h Normal file
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Manuel Requena <manuel.requena@cttc.es>
*/
#ifndef LTE_RLC_HEADER_H
#define LTE_RLC_HEADER_H
#include "ns3/header.h"
#include <list>
namespace ns3 {
/**
* \ingroup lte
* \brief The packet header for the Radio Link Control (RLC) protocol packets
*
* This class has fields corresponding to those in an RLC header as well as
* methods for serialization to and deserialization from a byte buffer.
* It follows 3GPP TS 36.322 Radio Link Control (RLC) protocol specification.
*/
class LteRlcHeader : public Header
{
public:
/**
* \brief Constructor
*
* Creates a null header
*/
LteRlcHeader ();
~LteRlcHeader ();
void SetFramingInfo (uint8_t framingInfo);
void SetSequenceNumber (uint16_t sequenceNumber);
uint8_t GetFramingInfo () const;
uint16_t GetSequenceNumber () const;
void PushExtensionBit (uint8_t extensionBit);
void PushLengthIndicator (uint16_t lengthIndicator);
uint8_t PopExtensionBit (void);
uint16_t PopLengthIndicator (void);
typedef enum {
DATA_FIELD_FOLLOWS = 0,
E_LI_FIELDS_FOLLOWS = 1
} ExtensionBit_t;
typedef enum {
FIRST_BYTE = 0x00,
NO_FIRST_BYTE = 0x02
} FramingInfoFirstByte_t;
typedef enum {
LAST_BYTE = 0x00,
NO_LAST_BYTE = 0x01
} FramingInfoLastByte_t;
static TypeId GetTypeId (void);
virtual TypeId GetInstanceTypeId (void) const;
virtual void Print (std::ostream &os) const;
virtual uint32_t GetSerializedSize (void) const;
virtual void Serialize (Buffer::Iterator start) const;
virtual uint32_t Deserialize (Buffer::Iterator start);
private:
uint16_t m_headerLength;
uint8_t m_framingInfo; // 2 bits
uint16_t m_sequenceNumber; // 10 bits TODO Maybe should be SequenceNumber10 or similar
std::list <uint8_t> m_extensionBits; // Includes extensionBit of the fixed part
std::list <uint16_t> m_lengthIndicators;
};
}; // namespace ns3
#endif // LTE_RLC_HEADER_H