# NetSim by Tetcos > NetSim is a network simulator and emulator for designing, simulating, and analyzing communication networks. It is used by 500+ organizations in 30+ countries for network design, protocol analysis, military communications modeling, and network R&D. The Tetcos product family consists of NetSim (network simulation, available in Pro, Standard, and Academic editions), NetSim Astra (satellite planning and RF coverage studio), and NetSim Cyber (cyberattack simulation for power and industrial networks). ## Company Tetcos is a privately held company based in Bangalore, India. Founded in 2005, Tetcos develops NetSim, the leading network simulation software. Current version: NetSim v15.0. Scientific advisory: Prof. Anurag Kumar (Indian Institute of Science, Bangalore) has reviewed the scientific correctness of NetSim's protocol implementations since 2005. Prof. Chandra R. Murthy (Indian Institute of Science, Bangalore) reviews the PHY layer, including MIMO, beamforming, channel and propagation models, and link adaptation, since 2018. Details: https://www.tetcos.com/about-us.html - Website: https://www.tetcos.com - Phone: +91 76760 54321 - Support: https://support.tetcos.com - GitHub: https://github.com/NetSim-TETCOS ## Products ### NetSim Flagship network simulation and emulation platform for designing 5G/6G, military, and satellite networks. - Network coverage and capacity studies - Govt. users: Military and Defence, Space - Enterprise users: Telecom 5G, Satellite providers, Network equipment manufacturers - Available in three editions: - **NetSim Pro** - for industry and defence R&D; access to all technology libraries with depth in 5G/6G, NTN, and military tactical radio; scales to thousands of nodes; protocol C source code and hardware emulator. URL: https://www.tetcos.com/netsim-pro.html - **NetSim Standard** - for R&D at universities; GUI plus protocol C source code you can modify and extend; faster than script-based and open-source simulators; online debugging in Visual Studio; interfaces with Python, MATLAB, SUMO, Wireshark. URL: https://www.tetcos.com/netsim-std.html - **NetSim Academic** - for university teaching and lab experimentation; 35+ inbuilt lab experiments; deeply discounted pricing. URL: https://www.tetcos.com/netsim-acad.html ### NetSim Astra Satellite Planning & RF Coverage Studio for constellation visualization, link budget analysis, and coverage prediction. - Web-based, 3D CesiumJS globe with satellite orbits, ground stations, and heatmap overlays - Link budget analysis with ITU-R P.618 atmospheric losses (rain, gas, cloud, scintillation) - 5G NTN beam and link planning with 3GPP TR 38.811 antenna models - Coverage prediction heatmaps and per-satellite footprint polygons - Constellation sources: Synthetic (Walker), Live TLEs, Fixed, GEO/IGSO - Antenna models: Gaussian, Bessel (3GPP TR 38.811), ITU-R S.672-4, Phased Array (URA) - Multibeam CINR analysis for GEO frequency-reuse payloads (FR1-FR4) - URL: https://www.tetcos.com/netsim-astra.html - Q&A on the coverage-planning workflow, and how it compares with Ansys STK and MATLAB: https://www.tetcos.com/netsim-astra-q-and-a.html ### NetSim Cyber Protocol-aware cyberattack simulation for Cyber Physical Power Systems (CPPS) and industrial networks. - Software testbed for power-grid security R&D - scalable, safe, reconfigurable without rewiring - Models IEEE C37.118, IEC 61850 (GOOSE), DNP3, Modbus and SCADA traffic - Study post-exploitation impact on substations, PMUs, and PDCs - Use cases: critical-infrastructure security research and grid resilience studies - URL: https://www.tetcos.com/netsim-cyber.html - Q&A on protocol-aware attack simulation: the Threat Agent, the attack library per protocol, testbed options with or without hardware, IDS validation and labelled OT attack datasets: https://www.tetcos.com/netsim-cyber-q-and-a.html ### NetSim Emulator Connect NetSim simulator to real hardware running live applications. - URL: https://www.tetcos.com/netsim-emulator.html ## Technology Libraries ### 5G/6G Networks Full-stack, packet-level simulation of 5G NR and emerging 6G networks. - Devices: UE, gNB (Omni, sector), 5G Core (SMF, AMF, UPF) - Features: Massive MIMO, Beamforming, Network Slicing, SA/NSA modes - Bands: FR1 (sub-6 GHz) and FR2 (mmWave) - AI/ML integration for RAN optimization - URL: https://www.tetcos.com/5g.html - Q&A on the 5G/6G implementation: 26 questions covering source-code access, PHY abstraction, SINR-MCS-BLER mapping, reference signals, propagation and antenna models, HARQ, handover and RRC events, logging, and external MATLAB/Python interfaces: https://www.tetcos.com/5g-6g-implementation-q-and-a.html - Book companion for "Understanding 5G New Radio: An Experimental Approach" (Yashvanth L, Pranav Viswanathan, Chandra R. Murthy; Springer Nature, 2026, open access): https://www.tetcos.com/5G-Book.html ### Non-Terrestrial Networks (NTN) 5G/6G satellite and aerial network simulation. - Full-stack packet-level 5G NTN: LEO (160-2000 km), MEO, GEO; transparent payload per 3GPP TR 38.821 - Constellations from live TLE data propagated by SGP4, or synthetic Walker Delta and Walker Star - Earth-fixed and Earth-moving spot beams; link budget per TR 38.821 Section 6.1.3.1; TR 38.811 channel model - Antenna models: TR 38.811 circular aperture (Bessel), ITU-R S.672, Gaussian - Configured Grant Type 1 uplink scheduling for satellite round-trip times; CIR-based and geometric interference - Validated TR 38.821 Set 1 reference scenario (19 beams, 190 UEs, LEO 600, S-band) - URL: https://www.tetcos.com/ntn.html - Q&A on 5G NTN simulation: orbits and beams, link budgets, scheduling under satellite delay, outputs, and what is not modelled: https://www.tetcos.com/netsim-ntn-q-and-a.html ### Military Radio & MANET Tactical communication network simulation for defense. - Radio types: Handheld, Manpack, Vehicular, Naval, Airborne - Bands: VHF, UHF, L-Band, S-Band, Ku, Ka, X - Dynamic TDMA waveforms - MANET routing: DSR, AODV, OLSR, ZRP - URL: https://www.tetcos.com/military-radio.html ### Mobile Ad Hoc Networks (MANET) Multi-hop wireless ad hoc network simulation. - Routing protocols: DSR, AODV, OLSR, ZRP - Full TCP/IP stack modeling - URL: https://www.tetcos.com/manet.html ### OLSRv2 Optimized Link State Routing Protocol Version 2 (RFC 7181) for MANETs. - NHDP neighbor discovery, Flooding and Routing MPRs, link metrics, TC messages - Proactive link-state routing, successor to OLSR (RFC 3626) - URL: https://www.tetcos.com/olsrv2.html ### Satellite Communication Simulate satellite networks with various frequency bands. - Ku, Ka, X band support - LEO, MEO, GEO satellite configurations - URL: https://www.tetcos.com/satellite-communication.html ### WLAN (Wi-Fi) 802.11 wireless LAN simulation. - 802.11a/b/g/n/ac/ax support - URL: https://www.tetcos.com/wlan.html ### IoT and Wireless Sensor Networks Internet of Things and WSN simulation. - 802.15.4, ZigBee, 6LoWPAN - LEACH, RPL routing - URL: https://www.tetcos.com/iot-wsn.html ### VANETs Vehicular Ad Hoc Network simulation. - V2V and V2I communication - SUMO integration for traffic simulation - URL: https://www.tetcos.com/vanets.html ### LTE and LTE-Advanced 4G cellular network simulation. - URL: https://www.tetcos.com/lte.html ### Cognitive Radio 802.22 cognitive radio network simulation. - URL: https://www.tetcos.com/cognitive-radio.html ### Software Defined Networks (SDN) SDN simulation with OpenFlow support. - URL: https://www.tetcos.com/sdn.html ### Underwater Acoustic Networks Underwater wireless network simulation. - URL: https://www.tetcos.com/underwater_networks.html ## Applications ### AI/ML with NetSim Machine learning integration for network optimization. - Generate synthetic training data - AI/ML algorithms for RAN - Python interface - URL: https://www.tetcos.com/machine-learning-netsim.html ### Cyber Security Network security simulation and attack modeling. - URL: https://www.tetcos.com/cyber-security.html ### Drone Swarm Communications UAV and drone network simulation. - URL: https://www.tetcos.com/drone-swarm-comm.html - URL: https://www.tetcos.com/drone-manet-comm.html - URL: https://www.tetcos.com/uav-drone-communication.html ### Network Slicing 5G network slicing simulation (eMBB, URLLC, MIoT, V2X). - URL: https://www.tetcos.com/network-slicing.html ## Simulation Studies with Published Results These pages carry original, quantified results produced in NetSim, presented as HTML tables rather than downloads. ### 3GPP TR 38.821 NTN reference scenario Validated Set 1 reference scenario (19 beams, 190 UEs, LEO 600 km, S-band) with per-percentile UE throughput, satellite capacity, and spectral efficiency per TRxP. - URL: https://www.tetcos.com/ntn-reference-scenario.html ### 5G scheduling: throughput and fairness Scheduling algorithms compared on throughput and fairness in a multi-gNB, multi-UE scenario with full-buffer and non-full-buffer traffic, user mobility, and channel fading. Includes the gNB, UE, and application parameter tables used. - URL: https://www.tetcos.com/5g-scheduling-throughput-and-fairness.html ### 5G load balancing using cell individual offset Case study with a mobile network operator using Cell Individual Offset to balance UE association across base stations without changing hardware or the physical network. Includes topology, simulation parameters, and results. - URL: https://www.tetcos.com/5G-Load-Balancing.html ### Simulating 5G heterogeneous networks How to build a multi-tier HetNet in NetSim, with sparse high-power macro base stations and dense low-power small cells in the same or different frequency bands, followed by a worked example with system model and results. - URL: https://www.tetcos.com/simulating-5G-HetNets.html ## Editions, Licensing and Releases ### Version comparison Feature and scale matrix across the Pro, Standard, and Academic editions, including node-count ceilings. - URL: https://www.tetcos.com/version-comparison.html ### Technology libraries The protocol libraries a NetSim licence is assembled from, and what each contains. - URL: https://www.tetcos.com/technology-libraries.html ### Licensing Cloud floating and on-premises floating licence models, and how to choose between them. - URL: https://www.tetcos.com/netsim-licensing.html ### New releases Release notes and what changed in each NetSim and NetSim Cyber version. - URL: https://www.tetcos.com/new-releases.html ## Technical Documentation Complete technical documentation for NetSim v15.0: ### User Manual Comprehensive guide covering installation, GUI usage, simulation setup, and all NetSim features. - URL: https://www.tetcos.com/downloads/v15.0/NetSim_User_Manual.pdf ### Experiments Manual Step-by-step lab experiments for academic use covering networking concepts and protocols. - URL: https://www.tetcos.com/downloads/v15.0/NetSim_Experiment_Manual.pdf ### 5G NR Technical documentation for 5G New Radio simulation including gNB, UE, MIMO, beamforming, scheduling, and 5G Core modeling. - URL: https://www.tetcos.com/downloads/v15.0/5G-NR.pdf ### 5G NTN (Non-Terrestrial Networks) Documentation for 5G satellite and aerial network simulation with LEO/MEO/GEO configurations. - URL: https://www.tetcos.com/downloads/v15.0/5G-NTN.pdf ### MANETs Mobile Ad Hoc Network simulation covering DSR, AODV, OLSR, ZRP routing protocols and wireless propagation. - URL: https://www.tetcos.com/downloads/v15.0/MANETs.pdf ### Satellite Communication Satellite network modeling including Ku, Ka, X band frequencies and orbital configurations. - URL: https://www.tetcos.com/downloads/v15.0/Satellite-Communication.pdf ### LTE and LTE-A 4G LTE and LTE-Advanced cellular network simulation documentation. - URL: https://www.tetcos.com/downloads/v15.0/LTE-and-LTE-A.pdf ### Cellular Networks General cellular network concepts and simulation in NetSim. - URL: https://www.tetcos.com/downloads/v15.0/Cellular-Networks.pdf ### IoT and WSN Internet of Things and Wireless Sensor Network simulation covering 802.15.4, ZigBee, 6LoWPAN, LEACH, and RPL. - URL: https://www.tetcos.com/downloads/v15.0/IoT-WSN.pdf ### VANETs Vehicular Ad Hoc Network simulation with V2V, V2I communication and SUMO traffic integration. - URL: https://www.tetcos.com/downloads/v15.0/VANETs.pdf ### Software Defined Networks SDN simulation with OpenFlow controller integration. - URL: https://www.tetcos.com/downloads/v15.0/Software-Defined-Networks.pdf ### Cognitive Radio 802.22 Cognitive Radio network simulation for dynamic spectrum access. - URL: https://www.tetcos.com/downloads/v15.0/Cognitive-Radio.pdf ### Underwater Acoustic Networks (UWAN) Underwater wireless network simulation with acoustic propagation modeling. - URL: https://www.tetcos.com/downloads/v15.0/UWAN.pdf ### Internetworks TCP/IP networking, routing, and switching simulation documentation. - URL: https://www.tetcos.com/downloads/v15.0/Internetworks.pdf ### Advanced Routing Advanced routing protocols and algorithms documentation. - URL: https://www.tetcos.com/downloads/v15.0/Advanced-Routing.pdf ### Legacy Networks Documentation for legacy network protocols and technologies. - URL: https://www.tetcos.com/downloads/v15.0/Legacy-Networks.pdf ### Propagation Models RF propagation models including path loss, shadowing, fading, and 3GPP channel models. - URL: https://www.tetcos.com/downloads/v15.0/Propagation-Models.pdf ### Emulator NetSim Emulator documentation for connecting simulations to real hardware and live applications. - URL: https://www.tetcos.com/downloads/v15.0/Emulation.pdf ### NetSim-Cyber Cyber attack and cyber security simulation in NetSim, including attack workflows, intrusion modeling, and protocol-level threat analysis. - URL: https://www.tetcos.com/downloads/v15.0/Cyber.pdf ## Online Documentation Interactive HTML documentation with detailed technical specifications and practical examples for NetSim v15.0: ### 5G-NR Complete 5G New Radio implementation details including PHY/MAC/RLC/PDCP layers, MIMO, beamforming, schedulers, HARQ, and network slicing. - Model Features: https://www.tetcos.com/documentation/v15.0/5G-NR/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/5G-NR/Featured_Examples.html ### 5G-NTN 5G Non-Terrestrial Networks with satellite and aerial platform simulation for LEO, MEO, and GEO configurations. - Model Features: https://www.tetcos.com/documentation/v15.0/5G-NTN/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/5G-NTN/Featured_Examples.html ### MANETs Mobile Ad Hoc Network simulation with DSR, AODV, OLSR, ZRP routing protocols, energy models, and mobility patterns. - Model Features: https://www.tetcos.com/documentation/v15.0/MANETs/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/MANETs/Featured_Examples.html ### LTE-and-LTE-A 4G LTE and LTE-Advanced cellular network modeling with eNodeB, UE, EPC, handover, and scheduling algorithms. - Model Features: https://www.tetcos.com/documentation/v15.0/LTE-and-LTE-A/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/LTE-and-LTE-A/Featured_Examples.html ### IoT-WSN Internet of Things and Wireless Sensor Networks with 802.15.4, ZigBee, 6LoWPAN, LEACH, and RPL protocols. - Model Features: https://www.tetcos.com/documentation/v15.0/IoT-WSN/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/IoT-WSN/Featured_Examples.html ### VANETs Vehicular Ad Hoc Networks with V2V, V2I communication, IEEE 802.11p/WAVE, and SUMO traffic integration. - Model Features: https://www.tetcos.com/documentation/v15.0/VANETs/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/VANETs/Featured_Examples.html ### Satellite-Communication Satellite network simulation with Ku, Ka, X band frequencies, orbital mechanics, and link budget calculations. - Model Features: https://www.tetcos.com/documentation/v15.0/Satellite-Communication/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Satellite-Communication/Featured_Examples.html ### Cognitive-Radio IEEE 802.22 Cognitive Radio networks with spectrum sensing, dynamic spectrum access, and PUE attack modeling. - Model Features: https://www.tetcos.com/documentation/v15.0/Cognitive-Radio/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Cognitive-Radio/Featured_Examples.html ### Software-Defined-Networks SDN simulation with OpenFlow protocol, controller integration, and programmable network behavior. - Model Features: https://www.tetcos.com/documentation/v15.0/Software-Defined-Networks/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Software-Defined-Networks/Featured_Examples.html ### UWAN Underwater Acoustic Wireless Networks with acoustic propagation, TDMA MAC, and underwater channel modeling. - Model Features: https://www.tetcos.com/documentation/v15.0/UWAN/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/UWAN/Featured_Examples.html ### Internetworks TCP/IP protocol stack, Ethernet, switching, and basic routing simulation for wired networks. - Model Features: https://www.tetcos.com/documentation/v15.0/Internetworks/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Internetworks/Featured_Examples.html ### Advanced-Routing Advanced routing protocols including OSPF, RIP, BGP, and custom routing algorithm development. - Model Features: https://www.tetcos.com/documentation/v15.0/Advanced-Routing/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Advanced-Routing/Featured_Examples.html ### Legacy-Networks Legacy network technologies including Token Ring, FDDI, and older protocol implementations. - Model Features: https://www.tetcos.com/documentation/v15.0/Legacy-Networks/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Legacy-Networks/Featured_Examples.html ### Cellular-Networks General cellular network concepts, cell planning, frequency reuse, and mobile network fundamentals. - Model Features: https://www.tetcos.com/documentation/v15.0/Cellular-Networks/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Cellular-Networks/Featured_Examples.html ### Propagation-Models RF propagation models including free space, log-distance, Hata, COST-231, and 3GPP 38.901 channel models. - Model Features: https://www.tetcos.com/documentation/v15.0/Propagation-Models/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Propagation-Models/Featured_Examples.html ### Emulation Hardware-in-the-loop emulation for connecting NetSim to real devices, applications, and external traffic. - Model Features: https://www.tetcos.com/documentation/v15.0/Emulation/Model_Features.html - Featured Examples: https://www.tetcos.com/documentation/v15.0/Emulation/Featured_Examples.html ### Cyber Cyber attack and cyber security simulation including attack workflows, intrusion modeling, and protocol-level threat analysis. - Index: https://www.tetcos.com/documentation/v15.0/Cyber/index.html ## Documentation Portal - All Documentation: https://www.tetcos.com/netsim-documentation.html - Knowledge Base: https://support.tetcos.com ## Customers NetSim is used by enterprise, government, defense, and academic organizations including: - Verizon (USA) - Idaho National Laboratories (USA) - ETRI (Korea) - CAIR DRDO (India) - HAL (India) - Philips (Netherlands) - IMDA (Singapore) - University of Sydney (Australia) - Full customer list: https://www.tetcos.com/customers.html ## Contact - Contact form: https://www.tetcos.com/contact.html - Support tickets: https://tetcos.freshdesk.com/support/tickets - Videos: https://www.youtube.com/user/Tetcos/videos