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5G NR
NetSim is the industry's leading 5G NR simulation tool used by 400+ organizations across 25+ countries.
Our customers include:
- Mobile network operators (MNOs) or Cellular service providers (CSPs)
- Leverage off-the-shelf models and analysis tools provided with NetSim to investigate Network Capacity, Peak throughputs, End-to-end latencies, etc.
- Equipment manufacturers
- Test technology and network designs before production
- Generate synthetic data to train AI/ML models
- Universities and Research institutions
- Accelerate R & D
- Write your own algorithms by modifying NetSim source codes
NetSim supports the latest advances in 5G including MIMO, Beamforming, mmWave Propagation, SA/NSA modes and comes with a range of inbuilt example scenarios.
Check out NetSim Emulator to understand how NetSim Simulator can be connected to real devices running live applications.

Overview
- End-to-End simulation of 5G networks
- Devices: UE, gNB, 5G Core devices (SMF, AMF, UPF), Router, Switch, Server
- GUI based with Drag and Drop, Packet Animator and Results Dashboard
- 5G library interfaces with NetSim's proprietary TCP/IP stack providing simulation capability across all layers of the network stack
- Discrete Event Simulation (DES) with event level debugging to inspect and control the simulation
- Application Models - FTP, HTTP, Voice, Video, Email, DB, Custom and more
- Packet level simulation with detailed packet trace, event trace and NR log file
- SA and NSA architectures based on 3GPP standards
- Protocol source C code shipped along with (standard / pro versions)

Devices in NetSim 5G NR Library
- UE
- gNBs
- 5G Core: AMF, SMF, UPF
- Buildings to differentiate between outdoor and indoor propagation
Specifications
- 5G Core (Based on TS23.501, TS23.502) functions and interfaces:
- Interfaces: N1/N2, N3, N4, N6, N11, XN
- 5G NSA deployment architecture (in addition to existing SA mode) for LTE - 5G dual connectivity, to leverage existing LTE RAN/EPC deployments. Support for options 3, 3a, 4, 4a, 7 and 7a
- TM (Transparent Mode): No RLC Header, Buffering at Tx only, No Segmentation/Reassembly, No feedback (i.e, No ACK/NACK)
- UM (Unacknowledge Mode): RLC Header, Buffering at both Tx and Rx, Segmentation/Reassembly, No feedback (i.e, No ACK/NACK)
- Transfer of upper layer PDUs
- Segmentation and reassembly of RLC Service Data Units (SDU)
- RLC SDU discard
- RLC buffer
- t-reassembly
- ARQ
- t-pollRetransmit
- Protocol Data Unit (PDU)
- TMD PDU
- UMD PDU
- Transmit PDCP SDU
- PDCP Association
- Maintenance of PDCP sequence numbers
- Discard Timer
- Transmission Buffer
- PDCP Entity
- t-Reordering Timer
- Receive buffer
- Handover: New UI variables (i) Handover interruption time, (ii) Handover margin, and (iii) Time to Trigger
- Outer loop link adaptation (OLLA): Once the t-BLER is set an initial MCS is "guessed". Subsequently, the MCS is dynamically adjusted based on an outer-loop link adaptation algorithm that uses HARQ ACK-NACK messages
- Mapping between logical channels and transport channels
- Multiplexing/De-multiplexing of MAC SDUs from one or different logical channels onto transport blocks (TB) to be delivered to the physical layer on transport channels
- MAC Scheduler featuring Round Robin, Proportional Fair, Max Throughput and Strictly fair algorithms
- Link Adaptation to change MCS based on CQI
- Flexible sub-carrier spacing in the NR frame structure using multiple numerologies.
- FR1 numerology µ = 0, 1, 2
- FR2 numerology µ = 2, 3
- All FR1 and FR2 operating Bands in both TDD and FDD
- Carrier aggregation: Intra-band and Inter-band
- Radio measurements:
- SNR, RSSI, Pathloss, ShadowFading Loss, BeamformingGain
- CQI, MCS
- Uplink and downlink physical channel
- Frame structure and physical resources
- MIMO
- gNB antenna count supported 1, 2, 4, 8, 16, 32, 64, 128
- UE antenna count supported 1, 2, 4, 8, 16
- MIMO Spatial channel model
- MIMO Spatial Channel Model (SCM), i.e., the channel is represented by a matrix H, whose entry (t, r) models the channel between the t-th and the r-th antenna elements at the transmitter and the receiver, respectively
- Gaussian channel with Rayleigh fast fading: i.i.d Complex Normal (0, 1) channel (H-matrix) that changes independently every coherence time.
- Beamforming gain per the Eigen values of the Gram (Wishart) matrix
- Ability to input per gNB pathloss files from 3rd party software tools like MATLAB
- Downlink Interference: Modified Wyner model, Exact geometric
- Uplink Interference: Interference over Thermal
- HARQ with soft combining
- Block error (BLER)
- Users can set a target BLER
- BLER will be looked up from SINR-BLER data tables
- NetSim has exhaustive SINR-BLER data for various transport block sizes for all MCSs (1, 2, ..., 28) for Base graphs (1, 2) for all three tables (1, 2, 3). In total 28*3*2 = 168 files
- SINR-BLER data generated using an in-house proprietary link-level simulation program. The results have been carefully validated against published literature
- Code block segmentation: The transport block is split into code blocks (CBs). Then CBs are grouped into code block groups (CBGs) and transmitted over the air interface.
- PHY layer modulations supported
- BPSK
- QPSK
- 16QAM
- 64QAM
- 256QAM
- Log distance mean pathloss
- Log normal shadowing
- mm-Wave Propagation models (Based on 3GPPTR38.900 Channel Model)
- Environment
- Rural Macrocell
- Urban Macrocell
- Urban Microcell
- Indoor Office – Mixed office, Open office
- UE Position
- Indoor
- Outdoor
- LOS State
- LOS (Line of Sight)
- NLOS (Non-Line of Sight)
- Outdoor to indoor model
- Highloss Model
- Low Loss model
- Environment
Featured Examples
- Understand 5G simulation flow through LTENR log file
- Effect of distance on pathloss for different channel models
- Rural-Macro
- Urban-Macro
- Urban-Micro
- Effect of UE distance on throughput in FR1 and FR2
- Frequency Range - FR1
- Frequency Range - FR2
- Impact of MAC Scheduling algorithms on throughput, in a Multi UE scenario
- Round Robin
- Proportional Fair
- Max Throughput
- Fair Scheduling
- Max Throughput for various bandwidth and 𝝁 configurations
- Max Throughput for different MCS and CQI
- Outdoor vs. Indoor Propagation
- Outdoor
- Indoor
- 4G vs. 5G: Capacity analysis for video downloads
- 4G
- 5G
- 5G Peak Throughput Analysis
- 3.5 GHz n78 band
- 100-Mhz no pathloss with 4:1 DL-UL ratio
- 50-Mhz no pathloss with 4:1 DL-UL ratio
- 26 GHz n258 band
- 400-Mhz no pathloss with 4:1 DL-UL ratio
- 200-Mhz no pathloss with 4:1 DL-UL ratio
- 3.5 GHz n78 band
- gNB Cell Radius for Different Link Budgets
- 3.5 GHz n78 band (C band)
- 26 GHz n258 band (mmWave band)
- Impact of numerology on a RAN with DL/UL applications involving phones, sensors and cameras
- UE Movement vs Throughput
- 5G KPIs for single and multi-UE scenarios