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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>ns-3 Change Log</title>
</head>
<body>
<h1>
ns-3: API and model change history</h1>
<!--
This ChangeLog is updated in the reverse order
with the most recent changes coming first. Date format: DD-MM-YYYY
-->
<p>
ns-3 is an evolving system and there will be API or behavioral changes
from time to time. Users who try to use scripts or models across
versions of ns-3 may encounter problems at compile time, run time, or
may see the simulation output change. </p>
<p>
We have adopted the development policy that we are going to try to ease
the impact of these changes on users by documenting these changes in a
single place (this file), and not by providing a temporary or permanent
backward-compatibility software layer. </p>
<p>
A related file is the RELEASE_NOTES file in the top level directory.
This file complements RELEASE_NOTES by focusing on API and behavioral
changes that users upgrading from one release to the next may encounter.
RELEASE_NOTES attempts to comprehensively list all of the changes
that were made. There is generally some overlap in the information
contained in RELEASE_NOTES and this file. </p>
<p>
The goal is that users who encounter a problem when trying to use older
code with newer code should be able to consult this file to find
guidance as to how to fix the problem. For instance, if a method name
or signature has changed, it should be stated what the new replacement
name is. </p>
<p>
Note that users who upgrade the simulator across versions, or who work
directly out of the development tree, may find that simulation output
changes even when the compilation doesn't break, such as when a
simulator default value is changed. Therefore, it is good practice for
_anyone_ using code across multiple ns-3 releases to consult this file,
as well as the RELEASE_NOTES, to understand what has changed over time.
</p>
<p>
This file is a best-effort approach to solving this issue; we will do
our best but can guarantee that there will be things that fall through
the cracks, unfortunately. If you, as a user, can suggest improvements
to this file based on your experience, please contribute a patch or drop
us a note on ns-developers mailing list.</p>
<hr>
<h1>Changes from ns-3.21 to ns-3.22</h1>
<h2>New API:</h2>
<ul>
<li> It is now possible to print the Neighbor Cache (ARP and NDISC) by using
the RoutingProtocolHelper
</li>
<li> A TimeProbe class has been added to the data collection framework in
the stats module, enabling TracedValues emitting values of type
ns3::Time to be handled by the framework.
</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> Several deprecated classes and class methods were removed, including EmuNetDevice, RandomVariable and derived classes, Packet::PeekData(), Ipv6AddressHelper::NewNetwork(Ipv6Address, Ipv6Prefix), Ipv6InterfaceContainer::SetRouter(), Ipv4Route::GetOutputTtl(), TestCase::AddTestCase(TestCase*), and TestCase::GetErrorStatus().
</li>
<li> Print methods involving routing tables and neighbor caches, in classes Ipv4RoutingHelper and Ipv6RoutingHelper, were converted to static methods.
</li>
<li>PointerValue attribute types in class UanChannel (NoiseModel), UanPhyGen (PerModel and SinrModel), UanPhyDual (PerModelPhy1, PerModelPhy2, SinrModelPhy1, and SinrModelPhy2), and SimpleNetDevice (TxQueue), were changed from PointerValue type to StringValue type, making them configurable via the Config subsystem.
</li>
<li> WifiPhy::CalculateTxDuration() and WifiPhy::GetPayloadDurationMicroSeconds () now take an additional frequency parameter.
</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> waf was upgraded to version 1.7.16
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> The default value of the `Speed` attribute of ConstantSpeedPropagationDelayModel was changed from 300,000,000 m/s to 299,792,458 m/s (speed of light in a vacuum), causing propagation delays using this model to vary slightly.
</li>
</ul>
<hr>
<h1>Changes from ns-3.20 to ns-3.21</h1>
<h2>New API:</h2>
<ul>
<li> New "const double& SpectrumValue:: operator[] (size_t index) const".
</li>
<li> A new TraceSource has been added to TCP sockets: SlowStartThreshold.
</li>
<li> New method CommmandLine::AddValue (name, attibutePath) to provide a
shorthand argument "name" for the Attribute "path". This also has
the effect of including the help string for the Attribute in the
Usage message.
</li>
<li> The GSoC 2014 project in the LTE module has brought some additional APIs:
<ul>
<li>a new abstract class LteFfrAlgorithm, which every future
implementation of frequency reuse algorithm should inherit from</li>
<li>a new SAPs: one between MAC Scheduler and FrAlgorithm, one between
RRC and FrAlgorithm</li>
<li>new attribute to enable Uplink Power Control in LteUePhy</li>
<li>new LteUePowerControl class, an implementation of Uplink Power Control, which is
configurable by attributes. ReferenceSignalPower is sent by eNB in SIB2.
Uplink Power Control in Closed Loop Accumulative Mode is enabled by default</li>
<li>seven different Frequency Reuse Algorithms (each has its own attributes): </li>
<ul>
<li>LteFrNoOpAlgorithm</li>
<li>LteFrHardAlgorithm</li>
<li>LteFrStrictAlgorithm</li>
<li>LteFrSoftAlgorithm</li>
<li>LteFfrSoftAlgorithm</li>
<li>LteFfrEnhancedAlgorithm</li>
<li>LteFfrDistributedAlgorithm</li>
</ul>
<li>attribute in LteFfrAlgorithm to set FrCellTypeId which is used in automatic
Frequency Reuse algorithm configuration</li>
<li>LteHelper has been updated with new methods related to frequency reuse algorithm:
SetFfrAlgorithmType and SetFfrAlgorithmAttribute</li>
</ul>
</li>
<li> A new SimpleNetDeviceHelper can now be used to install SimpleNetDevices.
</li>
<li> New PacketSocketServer and PacketSocketClient apps, meant to be used in tests.
</li>
<li> Tcp Timestamps and Window Scale options have been added and are enabled by default (controllable by attribute).
</li>
<li> A new CoDel queue model has been added to the 'internet' module.
</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> "Icmpv6L4Protocol::ForgeEchoRequest" is now returning a packet with the proper IPv6 header.
</li>
<li> The TCP socket Attribute "SlowStartThreshold" has been renamed "InitialSlowStartThreshold" to
clarify that the effect is only on the initial value.
</li>
<li> all schedulers were updated to interact with FR entity via FFR-SAP. Only PF, PSS, CQA,
FD-TBFQ, TD-TBFQ schedulers supports Frequency Reuse functionality. In the beginning
of scheduling process, schedulers ask FR entity for avaiable RBGs and then ask if UE
can be scheduled on RB</li>
<li> eNB RRC interacts with FFR entity via RRC-FFR SAP</li>
<li> new DL-CQI generation approach was implemented. Now DL-CQI is computed from control channel as signal
and data channel (if received) as interference. New attribute in LteHelper was added to specify
DL-CQI generation approach. New approach is default one in LteHelper </li>
<li> RadioEnvironmentMap can be generated for Data or Control channel and for specified RbId;
Data or Control channel and RbId can be configured by new attributes in RadioEnvironmentMapHelper </li>
<li> lte-sinr-chunk-processor refactored to lte-chunk-processor. Removed all lte-xxx-chunk-processor
implementations</li>
<li> BindToNetDevice affects also sockets using IPv6.</li>
<li> BindToNetDevice now calls implicitly Bind (). To bind a socket to a NetDevice and to a specific address,
the correct sequence is Bind (address) - BindToNetDevice (device). The opposite will raise an error.</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> None for this release. </li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> Behavior will be changed due to the list of bugs fixed (listed in RELEASE_NOTES); users are requested to review that list as well.
</ul>
<hr>
<h1>Changes from ns-3.19 to ns-3.20</h1>
<h2>New API:</h2>
<ul>
<li> Models have been added for low-rate, wireless personal area networks
(LR-WPAN) as specified by IEEE standard 802.15.4 (2006). The current
emphasis is on the unslotted mode of 802.15.4 operation for use in Zigbee,
and the scope is limited to enabling a single mode (CSMA/CA) with basic
data transfer capabilities. Association with PAN coordinators is not yet
supported, nor the use of extended addressing. Interference is modeled as
AWGN but this is currently not thoroughly tested. The NetDevice Tx queue
is not limited, i.e., packets are never dropped due to queue becoming full.
They may be dropped due to excessive transmission retries or channel access
failure. </li>
<li> A new IPv6 routing protocol has been added: RIPng. This protocol is
an Interior Gateway Protocol and it is available in the Internet module. </li>
<li> A new LTE MAC downlink scheduling algorithm named Channel and QoS
Aware (CQA) Scheduler is provided by the new "ns3::CqaFfMacScheduler" object.
</li>
<li> Units may be attached to Time objects, to facilitate specific output
formats (see Time::As()) </li>
<li> FlowMonitor "SerializeToXml" functions are now directly available
from the helper. </li>
<li> Access to OLSR's HNA table has been enabled </li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> The SixLowPan model can now use uncompressed IPv6 headers. An option to
define the minimum compressed packet size has been added. </li>
<li> MinDistance wsa replaced by MinLoss in FriisPropagationLossModel, to
better handle conditions outside of the assumed far field region. </li>
<li> In the DSR model, the attribute DsrOptionRerrHeader::ErrorType" has
been removed. </li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> Python 3.3 is now supported for Python bindings for ns-3. Python 3.3
support for API scanning is not supported. Python 3.2 is not supported.</li>
<li> Enable selection of high precision int64x64_t implementation
at configure time, for debugging purposes.</li>
<li> Optimized builds are now enabling signed overflow optimization
(-fstrict-overflow) and for gcc 4.8.2 and greater, also warning for cases
where an optimizization may occur due to compiler assumption that
overflow will not occur. </li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> The Internet FlowMonitor can now track IPv6 packets. </li>
<li> Ipv6Extension::m_dropTrace has been removed. Ipv6L3Protocol::m_dropTrace
is now fired when appropriate. </li>
<li> IPv4 identification field value is now dependent on the protocol
field. </li>
<li> Point-to-point trace sources now contain PPP headers </li>
</ul>
<hr>
<h1>Changes from ns-3.18.1 to ns-3.19</h1>
<h2>New API:</h2>
<ul>
<li> A new wifi extension for vehicular simulation support is available in the
src/wave directory. The current code represents an interim capability to
realize an IEEE 802.11p-compliant device, but without the WAVE extensions
(which are planned for a later patch). The WaveNetDevice modelled herein
enforces that a WAVE-compliant physical layer (at 5.9 GHz) is selected, and
does not require any association between devices (similar to an adhoc WiFi
MAC), but is otherwise similar (at this time) to a WifiNetDevice. WAVE
capabililties of switching between control and service channels, or using
multiple radios, are not yet modelled.
</li>
<li>New SixLowPanNetDevice class providing a shim between
IPv6 and real NetDevices. The new module implements 6LoWPAN:
"Transmission of IPv6 Packets over IEEE 802.15.4 Networks" (see
<a href="http://www.ietf.org/rfc/rfc4944.txt">RFC 4944</a> and
<a href="http://www.ietf.org/rfc/rfc6262.txt">RFC 6262</a>),
resulting in a heavy header compression for IPv6 packets.
The module is intended to be used on 802.15.4 NetDevices, but
it can be used over other NetDevices. See the manual for
further discussion.
</li>
<li> LteHelper has been updated with some new APIs:
<ul>
<li>new overloaded Attach methods to enable UE to automatically determine
the eNodeB to attach to (using initial cell selection);</li>
<li>new methods related to handover algorithm: SetHandoverAlgorithmType
and SetHandoverAlgorithmAttribute;</li>
<li>a new attribute AnrEnabled to activate/deactivate Automatic Neighbour
Relation (ANR) function; and</li>
<li>a new method SetUeDeviceAttribute for configuring LteUeNetDevice.</li>
</ul>
</li>
<li> The GSoC 2013 project in the LTE module has brought some additional APIs:
<ul>
<li>a new abstract class LteHandoverAlgorithm, which every future
implementation of automatic handover trigger should inherit from;</li>
<li>new classes LteHandoverAlgorithm and LteAnr as sub-modules of
LteEnbNetDevice class; both interfacing with the LteEnbRrc sub-module
through Handover Management SAP and ANR SAP;</li>
<li>new attributes in LteEnbNetDevice and LteUeNetDevice classes related
to Closed Subscriber Group (CSG) functionality in initial cell
selection;</li>
<li>new attributes in LteEnbRrc for configuring UE measurements' filtering
coefficient (i.e., quantity configuration);</li>
<li>a new public method AddUeMeasReportConfig in LteEnbRrc for setting up
custom UE measurements' reporting configuration; measurement reports
can then be captured from the RecvMeasurementReport trace source;
and</li>
<li>new trace sources in LteUeRrc to capture more events, such as System
Information messages (MIB, SIB1, SIB2), initial cell selection, random
access, and handover.</li>
</ul>
</li>
<li>A new parallel scheduling algorithm based on null messages, a common
parallel DES scheduling algorithm, has been added. The null message
scheduler has better scaling properties when running on some scenarios
with large numbers of nodes since it does not require a global
communication.
</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> It is now possible to use Ipv6PacketInfoTag from UDP applications in the
same way as with Ipv4PacketInfoTag. See Doxygen for current limitations in
using Ipv[4,6]PacketInfoTag to set IP properties.</li>
<li>A change is introduced for the usage of the EpcHelper
class. Previously, the EpcHelper class included both the API
definition and its (only) implementation; as such, users would
instantiate and use the EpcHelper class directly in their
simulation programs. From now on,
EpcHelper is just the base class defining the API, and the
implementation has been moved to derived classes; as such,
users are now expected to use one of the derived classes in
their simulation program. The implementation previously
provided by the EpcHelper class has been moved to the new
derived class PointToPointEpcHelper.</li>
<li> The automatic handover trigger and ANR functions in LTE module have been
moved from LteEnbRrc class to separate classes. As a result, the related
attributes, e.g., ServingCellHandoverThreshold, NeighbourCellHandoverOffset,
EventA2Threshold, and EventA4Threshold have been removed from LteEnbRrc
class. The equivalent attributes are now in A2A4RsrqHandoverAlgorithm and
LteAnr classes.</li>
<li> Master Information Block (MIB) and System Information Block Type 1 (SIB1)
are now transmitted as LTE control messages, so they are no longer part of
RRC protocol.</li>
<li> UE RRC state model in LTE module has been considerably modified and is
not backward compatible with the previous state model.</li>
<li> Additional time units (Year, Day, Hour, Minute) were added to the time
value class that represents simulation time; the largest unit prior to
this addition was Second.
</li>
<li> SimpleNetDevice and SimpleChannel are not so simple anymore. SimpleNetDevice can be now a
Broadcast or PointToPoint NetDevice, it can have a limited bandwidth and it uses an output
queue.
</li>
</ul>
<h2>Changes to build system:</h2>
<h2>Changed behavior:</h2>
<ul>
<li> For the TapBridge device, in UseLocal mode there is a MAC learning function. TapBridge has been waiting for the first packet received from tap interface to set the address of the bridged device to the source address of the first packet. This has caused problems with WiFi. The new behavior is that after connection to the tap interface, ns-3 learns the MAC address of that interface with a system call and immediately sets the address of the bridged device to the learned one. See <a href="https://www.nsnam.org/bugzilla/show_bug.cgi?id=1777">bug 1777</a> for more details.</li>
<li> TapBridge device now correctly implements IsLinkUp() method.</li>
<li> IPv6 addresses and routing tables are printed like in Linux "route -A inet6" command.</li>
<li> A change in Ipv[4,6]Interface enforces the correct behaviour of IP
when a device do not support the minimum MTU requirements.
This is set to 68 and 1280 octects respectively. IP simulations that
may have run over devices with smaller MTUs than 68 or 1280, respectively,
will no longer be able to use such devices.</li>
</ul>
<hr>
<h1>Changes from ns-3.18 to ns-3.18.1</h1>
<h2>New API:</h2>
<ul>
<li> It is now possible to randomize the time of the first beacon from an
access point. Use an attribute "EnableBeaconJitter" to enable/disable
this feature.
</li>
<li> A new FixedRoomPositionAllocator helper class is available; it
allows one to generate a random position uniformly distributed in the
volume of a chosen room inside a chosen building.
</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> Logging wildcards: allow "***" as synonym for "*=**" to turn on all logging.
</li>
<li> The log component list ("NS_LOG=print-list") is now printed alphabetically.
</li>
<li> Some deprecated IEEE 802.11p code has been removed from the wifi module
</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> The Python API scanning system (./waf --apiscan) has been fixed (bug 1622)
</li>
<li> Waf has been upgraded from 1.7.11 to 1.7.13
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> Wifi simulations have additional jitter on AP beaconing (see above) and some bug fixes have been applied to wifi module (see RELEASE_NOTES)
</li>
</ul>
<hr>
<h1>Changes from ns-3.17 to ns-3.18</h1>
<h2>New API:</h2>
<ul>
<li>New features have been added to the LTE module:
<ul>
<li>PHY support for UE measurements (RSRP and RSRQ)</li>
<li>RRC support for UE measurements (configuration, execution, reporting)</li>
<li>Automatic Handover trigger based on RRC UE measurement reports</li>
</ul>
<li>Data collection components have been added in the 'src/stats' module.
Data collection includes a Probe class that attaches to ns-3 trace
sources to filter their output, and two Aggregator classes for
marshaling probed data into text files or gnuplot plots. The ns-3
tutorial has been extended to illustrate basic functionality. </li>
<li>In 'src/wifi', several changes were made to enable partial 802.11n support:
<ul>
<li>A new helper (HtWifiMacHelper) was added to set up a high throughput (HT) MAC entity</li>
<li>New attributes were added to help the user setup a high throughpt (HT) PHY entity. These attributes can be set using the YansWifiPhyHelper</li>
<li>A new standard value has been added that enables the new 11n data rates.</li>
<li>New 11n preambles has been added (Mixed format and greenfield). To be able to change Tx duration according to the preamble used, a new class TxVector has been added to carry the transmission parameters (mode, preamble, stbc,..). Several functions have been updated to allow the passage of TxVector instead of WifiMode in MacLow, WifiRemoteStationManager, WifiPhy, YansWifiPhy,.. </li>
<li>A new information element has been added: HTCapabilities. This information element is added to the MAC frame header if the node is an HT node. This HTCapabilites information element is used to advertise the HT capabilites of the node to other nodes in the network</li>
</ul>
<li>InternetStackHelper has two new functions:<tt>SetIpv4ArpJitter (bool enable)</tt>
and <tt>SetIpv6NsRsJitter (bool enable)</tt> to enable/disable
the random jitter on the tranmission of IPv4 ARP Request and IPv6 NS/RS. </li>
<li>Bounds on valid time inputs for time attributes can now be enabled.
See <tt>attribute-test-suite.cc</tt> for an example.</li>
<li>New generic hash function interface provided in the simulation core.
Two hash functions are provided: murmur3 (default), and the venerable
FNV1a. See the Hash Functions section in the ns-3 manual.</li>
<li>New Mac16Address has been added. It can be used with IPv6 to make
an Autoconfigured address.</li>
<li>Mac64Address support has been extended. It can now be used with
IPv6 to make an Autoconfigured address.</li>
<li>IPv6 can now detect and use Path-MTU. See
<tt>examples/ipv6/fragmentation-ipv6-two-MTU.cc</tt> for an example.</li>
<li>Radvd application has a new Helper. See the updated
<tt>examples/ipv6/radvd.cc</tt> for an example.</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> The Ipv6InterfaceContainer functions to set a node in forwarding state (i.e., a router)
and to install a default router in a group of nodes have been extensively changed.
The old function <tt>void Ipv6InterfaceContainer::SetRouter (uint32_t i, bool router)</tt>
is now DEPRECATED.
</li>
<li> The documentation's IPv6 addresses (2001:db8::/32, RFC 3849) are now
dropped by routers.
</li>
<li> The 'src/tools' module has been removed, and most files migrated to
'src/stats'. For users of these programs (the statistics-processing
in average.h, or the gnuplot support), the main change is likely to be
replacing the inclusion of "tools-module.h" with "stats-module.h".
Users of the event garbage collector, previously in tools, will now
include it from the core module.
</li>
<li> The Ipv6 UnicastForwardCallback and MulticastForwardCallback
have a new parameter, the NetDevice the packet has been received from.
Existing Ipv6RoutingProtocols should update their RouteInput function
accordingly, e.g., from <tt>ucb (rtentry, p, header);</tt> to <tt>ucb (idev, rtentry, p, header);</tt>
</li>
<li> The previous buildings module relied on a specific MobilityModel called
BuildingsMobilityModel, which supported buildings but only allowed
static positions. This mobility model has been removed. Now, the
Buildings module instead relies on a new class called
MobilityBuildingInfo which can be aggregated to any MobilityModel. This
allows having moving nodes in presence of buildings with any of
the existing MobilityModels.
</li>
<li>All functions in WifiRemoteStationManager named GetXxxMode have been changed to GetXxxTxVector </li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> Make references to bug id's in doxygen comments with
<tt>\bugid{num}</tt>, where <tt>num</tt> is the bug id number. This
form will generate a link to the bug in the bug database.
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> Now it is possible to request printing command line arguments to the
desired output stream using PrintHelp or operator <<
<pre>
CommandLine cmd;
cmd.Parse (argc, argv);
...
std::cerr << cmd;
</pre>
or
<pre>
cmd.PrintHelp (std::cerr);
</pre>
</li>
<li>Command line boolean arguments specified with no integer value (e.g. <tt>"--boolArg"</tt>) will toggle the value from the default, instead of always setting the value to true.
</li>
<li>IPv4's ARP Request and IPv6's NS/RS are now transmitted with a random delay.
The delay is, by default, a uniform random variable in time between 0 and 10ms.
This is aimed at preventing reception errors due to collisions during wifi broadcasts when the sending behavior is synchronized (e.g. due to applications starting at the same time on several different nodes).
This behaviour can be modified by using ArpL3Protocol's
<tt>RequestJitter</tt> and Icmpv6L4Protocol's <tt>SolicitationJitter</tt>
attributes or by using the new InternetStackHelper functions.
</li>
<li>AODV Hellos are disabled by default. The performance with Hellos enabled and disabled are almost identical. With Hellos enabled, AODV will suppress hellos from transmission, if any recent broadcast such as RREQ was transmitted. The attribute <tt>ns3::aodv::RoutingProtocol::EnableHello</tt> can be used to enable/disable Hellos.
</ul>
<hr>
<h1>Changes from ns-3.16 to ns-3.17</h1>
<h2>New API:</h2>
<ul>
<li>New TCP Westwood and Westwood+ models
<li>New FdNetDevice class providing a special NetDevice that is able to read
and write traffic from a file descriptor. Three helpers are provided
to associate the file descriptor with different underlying devices:
<ul>
<li> EmuFdNetDeviceHelper (to associate the |ns3| device with a physical
device in the host machine). This helper is intended to
eventually replace the EmuNetDevice in src/emu. </li>
<li> TapFdNetDeviceHelper (to associate the ns-3 device with the file
descriptor from a tap device in the host machine) </li>
<li> PlanteLabFdNetDeviceHelper (to automate the creation of tap devices
in PlanetLab nodes, enabling |ns3| simulations that can send and
receive traffic though the Internet using PlanetLab resource.</li>
</ul>
</li>
<li>In Ipv4ClickRouting, the following APIs were added:
<ul>
<li>Ipv4ClickRouting::SetDefines(), accessible through ClickInternetStackHelper::SetDefines(), for the user to set Click defines from the ns-3 simulation file.</li>
<li>SIMCLICK_GET_RANDOM_INT click-to-simulator command for ns-3 to drive Click's random number generation.</li>
</ul>
</li>
<li>LTE module
<ul>
<li> New user-visible LTE API
<ul>
<li>Two new methods have been added to LteHelper to enable the X2-based handover functionality: AddX2Interface, which setups the X2 interface between two eNBs, and HandoverRequest, which is a convenience method that schedules an explicit handover event to be executed at a given point in the simulation. </li>
<li>the new LteHelper method EnablePhyTraces can now be used to enable the new PHY traces</li>
</ul>
</li>
<li> New internal LTE API
<ul>
<li>New LTE control message classes DlHarqFeedbackLteControlMessage,
RachPreambleLteControlMessage, RarLteControlMessage, MibLteControlMessage</li>
<li>New class UeManager
<li>New LteRadioBearerInfo subclasses LteSignalingRadioBearerInfo,
LteDataRadioBearerInfo</li>
<li>New LteSinrChunkProcessor subclasses LteRsReceivedPowerChunkProcessor,
LteInterferencePowerChunkProcessor</li>
</ul>
</li>
</ul>
</li>
<li>New DSR API
<ul>
<li>Added PassiveBuffer class to save maintenance packet entry for passive acknowledgment option</li>
<li>Added FindSourceEntry function in RreqTable class to keep track of route request entry received from same source node</li>
<li>Added NotifyDataReciept function in DsrRouting class to notify the data receipt of the next hop from link layer. This is used for the link layer acknowledgment.</li>
</ul>
</li>
<li>New Tag, PacketSocketTag, to carry the destination address of a packet and the packet type</li>
<li>New Tag, DeviceNameTag, to carry the ns3 device name from where a packet is coming</li>
<li>New Error Model, BurstError model, to determine which bursts of packets are errored corresponding to an underlying distribution, burst rate, and burst size</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li>ns3::Object and subclasses DoStart has been renamed to DoInitialize</li>
<li>ns3::Object and subclasses Start has been renamed to Initialize</li>
<li>EnergySource StartDeviceModels renamed to InitializeDeviceModels</li>
<li>A typo was fixed in an LTE variable name. The variable ns3::AllocationRetentionPriority::preemprionVulnerability was changed to preemptionVulnerability.</li>
<li>Changes in TestCase API
<ul>
<li>TestCase has new enumeration TestDuration containing QUICK, EXTENSIVE, TAKES_FOREVER</li>
<li>TestCase constructor now requires TestDuration, old constructor marked deprecated</li>
</ul>
</li>
<li>Changes in LTE API
<ul>
<li> User-visible LTE API
<ul>
<li>The previous LteHelper method ActivateEpsBearer has been now replaced by two alternative methods: ActivateDataRadioBearer (to be used when the EPC model is not used) and ActivateDedicatedEpsBearer (to be used when the EPC model is used). In the case where the EPC model is used, the default EPS bearer is not automatically activated without the need for a specific method to be called.</li>
</ul>
</li>
<li> Internal LTE API
<ul>
<li>EpcHelper added methods AddUe, AddX2Interface. Method AddEnb now requires a cellId. Signature of ActivateEpsBearer changed to void ActivateEpsBearer (Ptr<NetDevice> ueLteDevice, uint64_t imsi, Ptr<EpcTft> tft, EpsBearer bearer)</li>
<li>LteHelper added methods EnableDlPhyTraces, EnableUlPhyTraces, EnableDlTxPhyTraces, EnableUlTxPhyTraces, EnableDlRxPhyTraces, EnableUlRxPhyTraces</li>
<li>LteHelper removed methods EnableDlRlcTraces, EnableUlRlcTraces, EnableDlPdcpTraces, EnableUlPdcpTraces</li>
<li>RadioBearerStatsCalculator added methods (Set/Get)StartTime, (Set/Get)Epoch, RescheduleEndEpoch, EndEpoch</li>
<li>RadioBearerStatsCalculator removed methods StartEpoch, CheckEpoch</li>
<li>RadioBearerStatsCalculator methods UlTxPdu, DlRxPdu now require a cellId</li>
<li>EpcEnbApplication constructor now requires Ipv4Addresses enbS1uAddress and sgwS1uAddress as well as cellId</li>
<li>EpcEnbApplication added methods SetS1SapUser, GetS1SapProvider, SetS1apSapMme and GetS1apSapEnb</li>
<li>EpcEnbApplication removed method ErabSetupRequest</li>
<li>EpcSgwPgwApplication added methods SetS11SapMme, GetS11SapSgw, AddEnb, AddUe, SetUeAddress</li>
<li>lte-common.h new structs PhyTransmissionStatParameters and PhyReceptionStatParameters used in TracedCallbacks</li>
<li>LteControlMessage new message types DL_HARQ, RACH_PREAMBLE, RAR, MIB</li>
<li>LteEnbCmacSapProvider new methods RemoveUe, GetRachConfig, AllocateNcRaPreamble, AllocateTemporaryCellRnti</li>
<li>LteEnbPhy new methods GetLteEnbCphySapProvider, SetLteEnbCphySapUser, GetDlSpectrumPhy, GetUlSpectrumPhy, CreateSrsReport</li>
<li>LteEnbPhy methods DoSendMacPdu, DoSetTransmissionMode, DoSetSrsConfigurationIndex, DoGetMacChTtiDelay, DoSendLteControlMessage, AddUePhy, DeleteUePhy made private</li>
<li>LteEnbPhySapProvider removed methods SetBandwidth, SetTransmissionMode, SetSrsConfigurationIndex, SetCellId</li>
<li>LteEnbPhySapUser added methods ReceiveRachPreamble, UlInfoListElementHarqFeeback, DlInfoListElementHarqFeeback</li>
<li>LtePdcp added methods (Set/Get)Status</li>
<li>LtePdcp DoTransmitRrcPdu renamed DoTransmitPdcpSdu</li>
<li>LteUeRrc new enum State. New methods SetLteUeCphySapProvider, GetLteUeCphySapUser, SetLteUeRrcSapUser, GetLteUeRrcSapProvider, GetState, GetDlEarfcn, GetDlBandwidth, GetUlBandwidth, GetCellId, SetUseRlcSm . GetRnti made const.</li>
<li>LteUeRrc removed methods ReleaseRadioBearer, GetLcIdVector, SetForwardUpCallback, DoRrcConfigurationUpdateInd</li>
<li>LtePdcpSapProvider struct TransmitRrcPduParameters renamed TransmitPdcpSduParameters. Method TransmitRrcPdu renamed TransmitPdcpSdu </li>
<li>LtePdcpSapUser struct ReceiveRrcPduParameters renamed ReceivePdcpSduParameters. Method ReceiveRrcPdu renamed TransmitPdcpSdu</li>
<li>LtePdcpSpecificLtePdcpSapProvider method TransmitRrcPdu renamed TransmitPdcpSdu</li>
<li>LtePdcpSpecificLtePdcpSapUser method ReceiveRrcPdu renamed ReceivePdcpSdu. Method ReceiveRrcPdu renamed ReceivePdcpSdu</li>
<li>LtePhy removed methods DoSetBandwidth and DoSetEarfcn</li>
<li>LtePhy added methods ReportInterference and ReportRsReceivedPower</li>
<li>LteSpectrumPhy added methods SetHarqPhyModule, Reset, SetLtePhyDlHarqFeedbackCallback, SetLtePhyUlHarqFeedbackCallback, AddRsPowerChunkProcessor, AddInterferenceChunkProcessor</li>
<li>LteUeCphySapProvider removed methods ConfigureRach, StartContentionBasedRandomAccessProcedure, StartNonContentionBasedRandomAccessProcedure</li>
<li>LteUeMac added method AssignStreams</li>
<li>LteUeNetDevice methods GetMac, GetRrc, GetImsi made const</li>
<li>LteUeNetDevice new method GetNas</li>
<li>LteUePhy new methods GetLteUeCphySapProvider, SetLteUeCphySapUser, GetDlSpectrumPhy, GetUlSpectrumPhy, ReportInterference, ReportRsReceivedPower, ReceiveLteDlHarqFeedback</li>
<li>LteUePhy DoSendMacPdu, DoSendLteControlMessage, DoSetTransmissionMode, DoSetSrsConfigurationIndex made private</li>
<li>LteUePhySapProvider removed methods SetBandwidth, SetTransmissionMode, SetSrsConfigurationIndex</li>
<li>LteUePhySapProvider added method SendRachPreamble</li>
</ul>
</li>
</ul>
<li>AnimationInterface method EnableIpv4RouteTracking returns reference to calling AnimationInterface object</li>
<li>To make the API more uniform across the various
PropagationLossModel classes, the Set/GetLambda methods of the
FriisPropagationLossModel and TwoRayGroundPropagationLossModel
classes have been changed to Set/GetFrequency, and now a Frequency
attribute is exported which replaces the pre-existing Lambda
attribute. Any previous user code setting a value for Lambda should
be changed to set instead a value of Frequency = C / Lambda, with C
= 299792458.0. </li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li>Waf shipped with ns-3 has been upgraded to version 1.7.10 and custom
pkg-config generator has been replaced by Waf's builtin tool.
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li>DSR link layer notification has changed. The model originally used
"TxErrHeader" in Ptr<WifiMac> to indicate the transmission
error of a specific packet in link layer; however, it was not working
correctly. The model now uses a different path to implement
the link layer notification mechanism; specifically, looking into the
trace file to find packet receive events. If the model finds one
receive event for the data packet, it is used as the indicator for
successful data delivery.</li>
</ul>
<hr>
<h1>Changes from ns-3.15 to ns-3.16</h1>
<h2>New API:</h2>
<ul>
<li>In the Socket class, the following functions were added:
<ul>
<li>(Set/Get)IpTos - sets IP Type of Service field in the IP headers.</li>
<li>(Set/Is)IpRecvTos - tells the socket to pass information about IP ToS up the stack (by adding SocketIpTosTag to the packet).</li>
<li>(Set/Get)IpTtl - sets IP Time to live field in the IP headers.</li>
<li>(Set/Is)RecvIpTtl - tells the socket to pass information about IP TTL up the stack (by adding SocketIpTtlTag to the packet).</li>
<li>(Set/Is)Ipv6Tclass - sets Traffic Class field in the IPv6 headers.</li>
<li>(Set/Is)Ipv6RecvTclass - tells the socket to pass information about IPv6 TCLASS up the stack (by adding SocketIpv6TclassTag to the packet).</li>
<li>(Set/Get)Ipv6HopLimit - sets Hop Limit field in the IPv6 headers.</li>
<li>(Set/Is)Ipv6RecvHopLimit - tells the socket to pass information about IPv6 HOPLIMIT up the stack (by adding SocketIpv6HoplimitTag to the packet).</li>
</ul>
A user can call these functions to set/get the corresponding socket option. See examples/socket/socket-options-ipv4.cc and examples/socket/socket-options-ipv6.cc for examples.
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li>In the MobilityHelper class, the functions EnableAscii () and EnableAsciiAll () were changed to use output stream wrappers rather than standard C++ ostreams. The purpose of this change was to make them behave analogously to other helpers in ns-3 that generate ascii traces. Now, the file stream that is open in MobilityHelper is closed nicely upon asserts and program exits.</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li>It's now possible to use distcc when building ns-3. See tutorial for details.</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li>Sending a packet through Ipv4RawSocket now supports checksum in the Ipv4Header. It is still not possible to manually put in arbitrary checksum as the checksum is automatically calculated at Ipv4L3Protocol. The user has to enable checksum globally for this to work. Simply calling Ipv4Header::EnableChecksum() for a single Ipv4Header will not work.</li>
<li>Now MultiModelSpectrumChannel allows a SpectrumPhy instance to change SpectrumModel at runtime by issuing a call to MultiModelSpectrumChannel::AddRx (). Previously, MultiModelSpectrumChannel required each SpectrumPhy instance to stick with the same SpectrumModel for the whole simulation.
</li>
</ul>
<hr>
<h1>Changes from ns-3.14 to ns-3.15</h1>
<h2>New API:</h2>
<ul>
<li>A RandomVariableStreamHelper has been introduced to assist with
using the Config subsystem path names to assign fixed stream numbers
to RandomVariableStream objects.</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li>Derived classes of RandomVariable (i.e. the random variable
implementations) have been ported to a new RandomVariableStream base class.
<li>For a given distribution DistributionVariable (such as UniformVariable),
the new class name is DistributionRandomVariable (such as
UniformRandomVariable). </li>
<li>The new implementations are also derived from class ns3::Object and
are handled using the ns-3 smart pointer (Ptr) class. </li>
<li>The new variable classes also have a new attributed called "Stream"
which allows them to be assigned to a fix stream index when assigned
to the underlying pseudo-random stream of numbers.</li>
</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li></li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li>Programs using random variables or models that include random variables
may exhibit changed output for a given run number or seed, due to a possible
change in the order in which random variables are assigned to underlying
pseudo-random sequences. Consult the manual for more information regarding
this.</li>
</ul>
<hr>
<h1>Changes from ns-3.13 to ns-3.14</h1>
<h2>New API:</h2>
<ul>
<li>The new class AntennaModel provides an API for modeling the radiation pattern of antennas.
</li>
<li>The new buildings module introduces an API (classes, helpers, etc)
to model the presence of buildings in a wireless network topology.
</li>
<li>The LENA project's implementation of the LTE Mac Scheduler Interface Specification
standardized by the Small Cell Forum (formerly Femto Forum) is now available for
use with the LTE module.
</li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> The Ipv6RawSocketImpl "IcmpFilter" attribute has been removed. Six
new member functions have been added to enable the same functionality.
</li>
<li> IPv6 support for TCP and UDP has been implemented. Socket functions
that take an address [e.g. Send (), Connect (), Bind ()] can accept an
ns3::Ipv6Address or a ns3::Address in addition to taking an ns3::Ipv4Address.
(Note that the ns3::Address must contain a ns3::Ipv6Address or a ns3::Ipv4Address,
otherwise these functions will return an error).
Internally, the socket now stores the remote address as a type "ns3::Address"
instead of a type "ns3::Ipv4Address". The IPv6 Routing Header extension is not
currently supported in ns3 and will not be reflected in the TCP and UDP checksum
calculations per RFC 2460. Also note that UDP checksums for IPv6 packets are
required per RFC, but remain optional and disabled by default in ns3 (in the
interest of performance).
</li>
<li>
When calling Bind () on a socket without an address, the behavior remains the
same: it will bind to the IPv4 "any" address (0.0.0.0). In order to Bind () to
the IPv6 "any" address in a similar fashion, use "Bind6 ()".
</li>
<li>
The prototype for the RxCallback function in the Ipv6EndPoint was changed.
It now includes the destination IPv6 address of the end point which was
needed for TCP. This lead to a small change in the UDP and ICMPv6 L4
protocols as well.
</li>
<li>
Ipv6RoutingHelper can now print the IPv6 Routing Tables at specific
intervals or time. Exactly like Ipv4RoutingHelper do.
</li>
<li>
New "SendIcmpv6Redirect" attribute (and getter/setter functions) to
Ipv6L3Protocol. The behavior is similar to Linux's conf "send_redirects",
i.e., enable/disable the ICMPv6 Redirect sending.
</li>
<li> The SpectrumPhy abstract class now has a new method
<pre>virtual Ptr<AntennaModel> GetRxAntenna () = 0;</pre>
that all derived classes need to implement in order to integrate properly with the newly added antenna model. In addition, a new member variable "Ptr<AntennaModel> txAntenna" has been added to SpectrumSignalParameters in order to allow derived SpectrumPhy classes to provide information about the antenna model used for the transmission of a waveform.
</li>
<li> The Ns2CalendarScheduler event scheduler has been removed.
</li>
<li>
ErrorUnit enum has been moved into RateErrorModel class, and symbols EU_BIT, EU_BYTE and EU_PKT have been renamed to RateErrorModel::ERROR_UNIT_BIT, RateErrorModel::ERROR_UNIT_BYTE and RateErrorModel::ERROR_UNIT_PACKET. RateErrorModel class attribute "ErrorUnit" values have also been renamed for consistency, and are now "ERROR_UNIT_BIT", "ERROR_UNIT_BYTE", "ERROR_UNIT_PACKET".
</li>
<li>
QueueMode enum from DropTailQueue and RedQueue classes has been unified and moved to Queueu class. Symbols DropTailQueue::PACKETS and DropTailQueue::BYTES are now named Queue::QUEUE_MODE_PACKETS and DropTailQueue::QUEUE_MODE_BYTES. In addition, DropTailQueue and RedQueue class attributes "Mode" have been renamed for consistency from "Packets" and "Bytes" to "QUEUE_MODE_PACKETS" and "QUEUE_MODE_BYTES".
</li>
<li>
The API of the LTE module has undergone a significant redesign with
the merge of the code from the LENA project. The new API is not
backwards compatible with the previous version of the LTE module.
</li>
<li> The Ipv6AddressHelper API has been aligned with the Ipv4AddressHelper API.
The helper can be set with a call to Ipv6AddressHelper::SetBase
(Ipv6Address network, Ipv6Prefix prefix) instead of NewNetwork
(Ipv6Address network, Ipv6Prefix prefix). A new NewAddress (void) method
has been added. Typical usage will involve calls to SetBase (), NewNetwork (),
and NewAddress (), as in class Ipv4AddressHelper.
</li>
</ul>
<h2>Changes to build system:</h2>
<ul>
<li> The following files are removed:
<pre>
src/internet/model/ipv4-l4-protocol.cc
src/internet/model/ipv4-l4-protocol.h
src/internet/model/ipv6-l4-protocol.cc
src/internet/model/ipv6-l4-protocol.h
</pre>
and replaced with:
<pre>
src/internet/model/ip-l4-protocol.cc
src/internet/model/ip-l4-protocol.h
</pre>
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> Dual-stacked IPv6 sockets are implemented. An IPv6 socket can accept
an IPv4 connection, returning the senders address as an IPv4-mapped address
(IPV6_V6ONLY socket option is not implemented).
</li>
<li>
The following examples/application/helpers were modified to support IPv6:
<pre>
csma-layout/examples/csma-star [*]
netanim/examples/star-animation [*]
point-to-point-layout/model/point-to-point-star.cc
point-to-point-layout/model/point-to-point-grid.cc
point-to-point-layout/model/point-to-point-dumbbell.cc
examples/udp/udp-echo [*]
examples/udp-client-server/udp-client-server [*]
examples/udp-client-server/udp-trace-client-server [*]
applications/helper/udp-echo-helper
applications/model/udp-client
applications/model/udp-echo-client
applications/model/udp-echo-server
applications/model/udp-server
applications/model/udp-trace-client
[*] Added '--useIpv6' flag to switch between IPv4 and IPv6
</pre>
</li>
</ul>
<hr>
<h1>Changes from ns-3.12 to ns-3.13</h1>
<h2>Changes to build system:</h2>
<ul>
<li> The underlying version of waf used by ns-3 was upgraded to 1.6.7.
This has a few changes for users and developers:
<ul>
<li> by default, "build" no longer has a subdirectory debug or optimized.
To get different build directories for different build types, you can use
the waf configure -o <argument> option, e.g.:
<pre>
./waf configure -o shared
./waf configure --enable-static -o static
</pre>
</li>
<li> (for developers) the ns3headers taskgen needs to be created with a
features parameter name:
<pre>
- headers = bld.new_task_gen('ns3header')
+ headers = bld.new_task_gen(features=['ns3header'])
</pre>
<li> no longer need to edit src/wscript to add a module, just create your
module directory inside src and ns-3 will pick it up
<li> In WAF 1.6, adding -Dxxx options is done via the DEFINES env. var.
instead of CXXDEFINES
<li> waf env values are always lists now, e.g. env['PYTHON'] returns
['/usr/bin/python'], so you may need to add [0] to the value in some places
</ul>
</ul>
<h2>New API:</h2>
<ul>
<li> In the mobility module, there is a new MobilityModel::GetRelativeSpeed() method returning the relative speed of two objects. </li>
<li> A new Ipv6AddressGenerator class was added to generate sequential
addresses from a provided base prefix and interfaceId. It also will detect
duplicate address assigments. </li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> In the spectrum module, the parameters to SpectrumChannel::StartTx () and SpectrumPhy::StartRx () methods are now passed using the new struct SpectrumSignalParameters. This new struct supports inheritance, hence it allows technology-specific PHY implementations to provide technology-specific parameters in SpectrumChannel::StartTx() and SpectrumPhy::StartRx(), while at the same time keeping a set of technology-independent parameters common across all spectrum-enabled PHY implementations (i.e., the duration and the power spectral density which are needed for interference calculation). Additionally, the SpectrumType class has been removed, since now the type of a spectrum signal can be inferred by doing a dynamic cast on SpectrumSignalParameters. See the <A href="http://mailman.isi.edu/pipermail/ns-developers/2011-October/009495.html" >Spectrum API change discussion on ns-developers</A> for the motivation behind this API change.
</li>
<li> The WifiPhyStandard enumerators for specifying half- and quarter-channel
width standards has had a change in capitalization:
<ul>
<li> WIFI_PHY_STANDARD_80211_10Mhz was changed to WIFI_PHY_STANDARD_80211_10MHZ
<li> WIFI_PHY_STANDARD_80211_5Mhz was changed to WIFI_PHY_STANDARD_80211_5MHZ
</ul>
<li> In the SpectrumPhy base class, the methods to get/set the
MobilityModel and the NetDevice were previously working with
opaque Ptr<Object>. Now all these methods have been
changed so that they work with Ptr<NetDevice>
and Ptr<MobilityModel> as appropriate. See <A href="https://www.nsnam.org/bugzilla/show_bug.cgi?id=1271">Bug 1271</A> on
bugzilla for the motivation.
</li>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> TCP bug fixes
<ul>
<li> Connection retries count is a separate variable with the retries limit, so cloned sockets can reset the count
<li> Fix bug on RTO that may halt the data flow
<li> Make TCP endpoints always holds the accurate address:port info
<li> RST packet is sent on closed sockets
<li> Fix congestion window sizing problem upon partial ACK in TcpNewReno
<li> Acknowledgement is sent, rather than staying silent, upon arrival of unacceptable packets
<li> Advance TcpSocketBase::m_nextTxSequence after RTO
</ul>
<li> TCP enhancements
<ul>
<li> Latest RTT value now stored in variable TcpSocketBase::m_lastRtt
<li> The list variable TcpL4Protocol::m_sockets now always holds all the created, running TcpSocketBase objects
<li> Maximum announced window size now an attribute, ns3::TcpSocketBase::MaxWindowSize
<li> TcpHeader now recognizes ECE and CWR flags (c.f. RFC3168)
<li> Added TCP option handling call in TcpSocketBase for future extension
<li> Data out of range (i.e. outsize acceptable range of receive window) now computed on bytes, not packets
<li> TCP moves from time-wait state to closed state after twice the time specified by attribute ns3:TcpSocketBase::MaxSegLifeTime
<li> TcpNewReno supports limited transmit (RFC3042) if asserting boolean attribute ns3::TcpNewReno::LimitedTransmit
<li> Nagle's algorithm supported. Default off, turn on by calling TcpSocket::SetTcpNoDelay(true)
</ul>
</ul>
<hr>
<h1>Changes from ns-3.11 to ns-3.12</h1>
<h2>Changes to build system:</h2>
<ul>
</ul>
<h2>New API:</h2>
<ul>
<li> New method, RegularWifiMac::SetPromisc (void), to set the interface
to promiscuous mode.
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li> The spelling of the attribute 'IntialCellVoltage' from LiIonEnergySource
was corrected to 'InitialCellVoltage'; this will affect existing users who
were using the attribute with the misspelling.
<li> Two trace sources in class WifiPhy have had their names changed:
<ul>
<li> 'PromiscSnifferRx' is now 'MonitorSnifferRx'
<li> 'PromiscSnifferTx' is now 'MonitorSnifferTx'
</ul>
</ul>
<h2>Changed behavior:</h2>
<ul>
<li> IPv4 fragmentation is now supported.
</ul>
<hr>
<h1>Changes from ns-3.10 to ns-3.11</h1>
<h2>Changes to build system:</h2>
<ul>
<li><b>Examples and tests are no longer built by default in ns-3</b>
<p>
You can now make examples and tests be built in ns-3 in two ways.
<ol>
<li> Using build.py when ns-3 is built for the first time:
<pre>
./build.py --enable-examples --enable-tests
</pre>
<li> Using waf once ns-3 has been built:
<pre>
./waf configure --enable-examples --enable-tests
</pre>
</ol>
</p></li>
<li><b> Subsets of modules can be enabled using the ns-3 configuration file</b>
<p>A new configuration file, .ns3rc, has been added to ns-3 that
specifies the modules that should be enabled during the ns-3 build.
See the documentation for details.
</p></li>
</ul>
<h2>New API:</h2>
<ul>
<li><b>int64x64_t</b>
<p>The <b>int64x64_t</b> type implements all the C++ arithmetic operators to behave like one of the
C++ native types. It is a 64.64 integer type which means that it is a 128bit integer type with
64 bits of fractional precision. The existing <b>Time</b> type is now automatically convertible to
<b>int64x64_t</b> to allow arbitrarily complex arithmetic operations on the content of <b>Time</b>
objects. The implementation of <b>int64x64_t</b> is based on the previously-existing
<b>HighPrecision</b> type and supercedes it.
</p></li>
</ul>
<h2>Changes to existing API:</h2>
<ul>
<li><b>Wifi TX duration calculation moved from InterferenceHelper to WifiPhy</b>
<p>The following static methods have been moved from the InterferenceHelper class to the WifiPhy class: