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This ns3 module implements a bidirectional coupling to the road traffic simulator SUMO. It dynamically synchronizes the positions of SUMO vehicles with corresponding ns3 nodes. Additionally, the state of SUMO vehicles can be controlled via ns3, e.g. for changing the speed. The module is built up on the TraCI API of the SUMO simulator. The module prerequisites a SUMO installation of version 1.1.0, but no additional sources.

Copy the traci/ and traci-applications/ directory into your <ns3-root>/src/ directory. If you copy the folders in the new <ns3-root>/contrib/ directory of ns-3.29, then you have to adapt the path for the example in traci-applications/examples/ns3-sumo-coupling-simple.cc.

Build/rebuild your ns3 simulator with the new module and run the example.

$ cd <ns3-root>/
$ ./waf configure --enable-examples
$ ./waf build
$ ./waf --run ns3-sumo-coupling-simple

To visualize the scenario in ns3 use

$ ./waf --run ns3-sumo-coupling-simple --vis

To visualize the scenario additionally with sumo-gui set the attribute in the example ns3-sumo-coupling-simple.cc to

client->SetAttribute("SumoGUI", BooleanValue(true));

The example can be found in traci-applications/examples/ns3-sumo-coupling-simple.cc.

ns3 is not considered to support dynamic node generation and destruction; everything should be defined BEFORE the simulation starts. Hence, for all SUMO scenarios with a fixed number of vehicles, created at the beginning of the simulation, no dynamic ns3 node generation/destruction is necessary. However, most SUMO scenarios include and exlude vehicles during the simulation, which requires ns3 to define a "node pool" before simulation starts (see example ns3-sumo-coupling-simple.cc). It is crucial to ensure an appropriate functionality for node inclusion and exclusion in ns3 to avoid unwanted packet transmissions within the "node pool". Therefore, additional functions in the application and other layers should be implemented.

The module uses the source code of SUMO (version 1.1.0) for compiling the TraCI API. The following steps are necessary for updating the used SUMO sources e.g. if there are changes in the TraCI API. Unpack the SUMO sources and copy the required headers to the ns3 traci module and rename them to avoid name conflicts.

$ cp <sumo-root>/src/config.h <ns3-root>/src/traci/model/sumo-config.h
$ cp <sumo-root>/src/foreign/tcpip/socket.h <ns3-root>/src/traci/model/sumo-socket.h
$ cp <sumo-root>/src/foreign/tcpip/socket.cpp <ns3-root>/src/traci/model/sumo-socket.cpp
$ cp <sumo-root>/src/foreign/tcpip/storage.h <ns3-root>/src/traci/model/sumo-storage.h
$ cp <sumo-root>/src/foreign/tcpip/storage.cpp <ns3-root>/src/traci/model/sumo-storage.cpp
$ cp <sumo-root>/src/utils/traci/TraCIAPI.h <ns3-root>/src/traci/model/sumo-TraCIAPI.h
$ cp <sumo-root>/src/utils/traci/TraCIAPI.cpp <ns3-root>/src/traci/model/sumo-TraCIAPI.cpp
$ cp <sumo-root>/src/traci-server/TraCIConstants.h <ns3-root>/src/traci/model/sumo-TraCIConstants.h
$ cp <sumo-root>/src/libsumo/TraCIDefs.h <ns3-root>/src/traci/model/sumo-TraCIDefs.h

Adapt the corresponding lines in the files to the new file names.

• sumo-socket.h:

#include "storage.h" → #include "sumo-storage.h"

• sumo-socket.cc:

#include "socket.h" → #include "sumo-socket.h"

• sumo-storage.cc:

#include "storage.h" → #include "sumo-storage.h"

• sumo-TraCIAPI.h:

#include <config.h> → #inlcude “sumo-config.h”
#include <foreign/tcpip/socket.h> → #include "sumo-socket.h"
#include <traci-server/TraCIConstants.h> → #include "sumo-TraCIConstants.h"
#include <libsumo/TraCIDefs.h> → #include "sumo-TraCIDefs.h"

• sumo-TraCIAPI.cc:

#include <config.h> → #inlcude “sumo-config.h”
#include "TraCIAPI.h" → #include "sumo-TraCIAPI.h"

This module was tested on the following system:

• ns3: 3.29
• SUMO: 1.1.0
• Ubuntu: 18.04 LTS
• gcc: 7.3.0

[1] Y. Pigné, G. Danoy & P. Bouvry, "A platform for realistic online vehicular network management," 2010 IEEE Globecom Workshops, Miami, FL, 2010, pp. 595-599.

[2] Wegener, Axel & Piorkowski, Michal & Raya, Maxim & Hellbrück, Horst & Fischer, Stefan & Hubaux, Jean-Pierre. (2008). TraCI: An Interface for Coupling Road Traffic and Network Simulators. Proceedings of the 11th Communications and Networking Simulation Symposium, CNS'08.

Patrick Schmager, TU Dresden, Vodafone Chair, [email protected]

Sebastian Kühlmorgen, TU Dresden, Vodafone Chair, [email protected]