Aqua-Sim is a underwater network simulator which supports a vast amount of protocols and features. Originally developed on the basis of NS-2, Aqua-Sim can effectively simulate acoustic signal attenuation and packet collisions in underwater sensor networks (UWSN). Moreover, Aqua-Sim supports three-dimensional deployment. This work consists of rewriting and porting Aqua-Sim to NS-3 to improve upon current simulation issues such as memory leakage and usage simplicity.
Work supported by the UWSN Lab at University of Connecticut.
- Discrete-event driven network simulator
- Support 3D networks and mobile networks
- Simulate underwater acoustic channels with high fidelity
- Implement a complete protocol stack from physical layer to application layer
This code is meant to be an add-on to current NS-3 software and therefore requires NS-3 and all pre-requirements of said software.
Current recommended NS-3 version is 3.40. The following system requirements must be met:
gcc-11,g++-11or higher for Linuxclangversion15.0.0for Mac OScmakeversion3.16or higher
To build current version of aqua-sim-ng, please follow these steps:
- download and install
ns-3.40:
mkdir workspace
cd workspace
wget https://www.nsnam.org/releases/ns-allinone-3.40.tar.bz2
tar xvf ns-allinone-3.40.tar.bz2
cd ns-allinone-3.40/ns-3.40/
./ns3 clean
./ns3 configure --build-profile=debug --enable-examples --enable-tests --disable-python --disable-werror
./ns3 build
- after the initial NS-3 build, copy
aqua-sim-ngcode intosrc/folder:
cd src/
git clone https://github.com/rmartin5/aqua-sim-ng.git
- reconfigure ns-3 project and build the new module:
cd ..
./ns3 configure --build-profile=debug --enable-examples --enable-tests --disable-python --disable-werror
./ns3 build
After that, you should be able to run example scripts located under src/aqua-sim-ng/examples/ folder.
LIBRA MAC protocol is a MAC protocol for UWSNs with multi-hop transmission range control capabilities, powered by Reinforcement Learning for adaptive route selection. More description can be found in the paper [1] (See References section down below).
To run LIBRA simulations, execute libra_grid_test.cc script from examples/ folder by running:
./ns3 run "LibraGridTest --lambda=0.01 --packet_size=800 --grid_size=10000 --range=3000 --n_nodes=128 --tx_power=60 --simStop=10000 --RngRun=0"
where:
LibraGridTest: name of the simulation script that refers to libra_grid_test.cc
--lambda: application traffic rate, following Poisson distribution, pkts/sec
--packet_size: user packet size, bytes
--grid_size: size of the node allocation area, X by X meters
--range: maximum transmission range, meters
--n_nodes: number of nodes to allocate
--tx_power: maximum Tx power, Watts
--simStop: total simulation time, seconds
--RngRun: seed for random generator
After successful run, the script should generate a simulation trace-file with the following name: libra-density-trace-0.01-128-0.asc
The trace-file contains raw simulation logs with every Tx/Rx event traced in a specific format. To extract useful data from the trace-file, such as network throughput, PDR, and more, please refer to print_results_libra.py script, located under scripts/ folder.
After executing the script, the parsed .txt file should be generated that will contain network metrics. An example of the parsed libra-density-0.01.txt content is the following:
Density NodesNumber Lambda TxPackets RxPackets TxCount RxCount CollisionCount TotalEnergyConsumption EnergyPerBit TotalThroughput PDR AvgHopCount
1.28 128 0.01 12871 8936 22730 152065 174667 69036.9 0.0012 5709733134989.97 0.69 1.89
Similar to LIBRA simulations described above, the following scripts are available for ALOHA and SFAMA protocols: aloha_grid_test.cc and sfama_grid_test.cc.
The simulation commands are similar to LIBRA as well:
./ns3 run "AlohaGridTest --lambda=0.01 --packet_size=800 --grid_size=10000 --range=3000 --n_nodes=128 --tx_power=60 --simStop=10000 --RngRun=0"
and
./ns3 run "SfamaGridTest --lambda=0.01 --packet_size=800 --grid_size=10000 --range=3000 --n_nodes=128 --tx_power=60 --simStop=10000 --RngRun=0"
To process raw trace-files after simulations, similar Python-scripts are available: print_results_aloha.py and print_results_sfama.py.
TRUMAC is a token-ring based MAC protocol for UWNs that leverages spatial-temporary diversity of underwater channel to improve channel utilization under high traffic loads. Please refer to [TBD] for more details.
To repeat simulations from [TBD], trumac_test.cc simulation script is available. The script compares TRUMAC, TDMA, and ALOHA against various network sizes and traffic rates. Here is an example:
./ns3 run "TrumacTest --seed=0 --psize=100 --nodes=40 --simStop=1000 --mac=trumac --rate=120 --dist=120 --algo=0"
where:
--seed: seed for pseudo-random generator function
--psize:: packet size, bytes
--nodes:: number of nodes in network
--simStop: total simulation time, seconds
--mac: select between trumac, tdma, or aloha protocols
--rate: rate of CBR traffic, bps
--dist:: average distance between any pair of nodes
--algo: next-sender-selection algorithm for TRUMAC: 0 - random selection; 1 - nearest-neighbor TSP algorithm
After running the script, a simulation-summary results_trumac.txt file should appear. The summary contains 7 columns, with the following metrics:
1 - total number of packets originated
2 - total number of packets received by the app
3 - total number of packets transmitted to PHY
4 - total number of packets received from PHY
5 - total number of collisions at PHY
6 - average MAC send-queue size
7 - average E2E packet delay, ms
To run multiple simulation instances, and aggregate the results, please refer to scripts/runTRUMAC.py script.
Jamming MAC (JMAC) protocol is a security-focused MAC protocol for UWSNs that aims to provide communication security in a shared unencrypted underwater channel. JMAC computes a pair-sequence of transmission schedules that are recoverable in desirable area, and not recoverable in the adversary area. Please refer to [TBD] for more details.
To repeat simulations from [TBD], jmac_test.cc simulation script is available. The script compares JMAC and ALOHA protocols in a specific simulation setting with N sensor nodes and M gateways, staticly allocated at the bottom and the surface, correspondingly. The script compares performance of JMAC and ALOHA in terms of PDR, throughput, and communication security (vulnerable area) provided. Here is an example:
./ns3 run "JmacTest --seed=1 --psize=400 --rate=120 --nodes=4 --mac=jmac --sinks=1 --simStop=1000 --center_x=1000 --center_z=1000 --radius=300 --depth=400 --epochTime=10"
where:
--seed: seed for pseudo-random generator function
--psize:: packet size, bytes
--rate: rate of CBR traffic, bps
--nodes:: number of nodes in network
--mac: select between jmac, or aloha protocols
--sinks:: number of gateways / sinks
--simStop: total simulation time, seconds
--center_x:: center of a circular bottom: x-coordinate, meters
--center_z:: center of a circular bottom: z-coordinate, meters
--radius:: radius of random nodes at bottom, meters
--depth:: depth of the bottom, meters
--epochTime:: Time in-between 2 CC-requests at a node, seconds
After running the script, a simulation-summary jmac_results.txt file should appear. The summary contains 9 columns, with the following metrics:
1 - total size of vulnerable area
2 - total energy consumed, joules
3 - total number of packets originated
4 - total number of packets received by the app
5 - total number of packets scheduled for transmission at MAC (JMAC only)
6 - total number of packets sent to PHY
7 - total number of packets received from PHY
8 - average MAC send-queue size
9 - average E2E packet delay, ms
To run multiple simulation instances, and aggregate the results, please refer to scripts/runJMAC.py script.
Note: Current JMAC implementation (see line 553 in aqua-sim-mac-jmac.cc) does not have the auction algorithm presented in the paper [TBD]. For the instructions on how to implement the auction algorithm, please refer to [TBD], and to the MATLAB code [TBD].
Older tested and supported versions of NS-3 included 3.24, 3.26, 3.27, 3.33 and 3.37. Older documentation, installation steps, example script walk through, and protocol creation guides can be found under Aqua-Sim NG Documentation.
Full publication of Aqua-Sim NG is currenlty underway and earlier versions of this paper will be available soon.
Aqua-Sim NG core continues to support basic underwater functions seen in Aqua-Sim 1.0, such as half-duplex, long propagation delays, and acoustic signal attenuation. Current protocol support includes: (MAC layer:) BroadcastMAC, Underwater ALOHA, CopeMAC, Underwater FAMA, Underwater Slotted FAMA, GOAL, UWAN, RMac, Tmac, (Routing Layer:) DBR, Residual-DBR, Static, Dynamic, Dummy, Flooding, DDoS-Restriction, VBF, and VBVA.
-
NS3 Architecture Support
- Core Aqua-Sim revamp and API integration
- Example and helper scripts addition
-
Protocol Port
- Extensive protocol port
-
Real-World Features
- Synchronization support
- Localization support
- Busy terminal model integration
- Fluctuating SNR
- Enhanced channel model support
- Transmission range uncertainty module
- Security features and module support
- Trace driven support for channel layer
-
Information-Centric Integration
- Adapted Named Data Network components
- Helper and test scripts integrated
- Specialized protocols addition
Expanded channel models to support multi-channel simulation, differentiated noise generator classes, and additional propagation model support. Our goal here is to depict better accuracy to real world scenarios in our simulation results.
By implementing a trace driven simulation we are able to control certain conditions throughout iterations of testing. An example of this could be applying channel readings from an ocean test directly into the simulator and depicting the given parameters throughout each test. This can be beneficial in cases such as ensuring channel conditions remain the same during protocol testing. While this channel consistency is not guaranteed in real world scenarios, it does add additional control when running simulations.
Synchronization and localization are two critical components for ensuring accurate underwater simulation. Past Aqua-Sim work does not support a dedicated module for these two features which places the burden instead on the developer. For this work, we incorporate location features such as range-based or range-free localization support. For time synchronization, we incorporate features to better integrate clock-skew and offset. The goal for these features is to allow for easier protocol integration for users and developers alike.
Real system features is an encompassing category which will better mimic the scenarios seen in UWSNs. Due to the uncertainty of channel conditions, we implement link asymmetry and heterogeneity. This allows the channel to simulate conditions such as fluctuating signal-to-noise ratios. Furthermore, these environmental factors in UWSNs may lead to acoustic transmission range uncertainty, which must be taken into account for more accurate results. Another unique feature which we see in UWSNs is the busy terminal problem. The two main factors contributing to this busy terminal problem are acoustic communication speed and the half-duplex nature of UWSNs. By demonstrating these components in Aqua-Sim Next Generation we can further strengthen our simulation of a real system.
Like any other network type, UWSN are susceptible to attacks. By implementing jamming, denial of service, packet spoofing, sinkhole and wormhole components, we can assist simulating potential underwater security threats. Our goal is to allow easier integration of these types of attacks by maliciously created nodes and easier analysis support.
We implement adapted Named Data Networking (NDN) techniques alongside specialized NDN protocols for UWSNs. By implementing these features, we can better depict and evaluate the improvements NDN can have in this environment. This integration consists of introducing interest and data structured packets, Pending Interest Tables, Forwarding Information Bases, and Context Storages for overall NDN inclusion that is specialized for underwater. Additionally, we implement this module through a packet demux on the physical layer, allowing for protocols to implement certain NDN features without completely revamping how our simulator functions.
[1] Dugaev, D.; Peng, Z.; Luo, Y.; Pu, L. Reinforcement-Learning Based Dynamic Transmission Range Adjustment in Medium Access Control for Underwater Wireless Sensor Networks. Electronics 2020, 9, 1727. https://doi.org/10.3390/electronics9101727
Copyright (c) 2017 UWSN Lab at the University of Connecticut. All rights reserved.
Robert Martin : [email protected]
Zheng Peng, Ph.D : [email protected]
Dmitrii Dugaev : [email protected]