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802.11-WLAN

Wi-Fi White Papers

Overview:

Users can design, model and simulate wireless networks using Access Point, Wireless Node, Router, Wired Node, Switch.
A drag & drop GUI enables users to quickly create the network and set properties with a simple right click.

WLAN Protocol Capabilites

NetSim WLAN NetSim WLAN

MAC Layer:

  • IEEE802.11e – Quality of Service based on EDCA
  • Rate Adaptation – Minstrel, Generic
  • CSMA/CA - protocol with RTS / CTS exchange, DIFS, Backoff and collisions, SIFS and ACK
  • Infrastructure - BSS mode and DCF mode
  • MPDU aggregation in 802.11n and 802.11ac

PHY Layer:

  • IEEE802.11a
    • Transmission Type – OFDM
    • Bandwidth – 20MHz
    • Frequency Band – 5GHz, supporting standard channels
    • Base Rate (Control Rate) – 6Mbps
    • PHY Rates - 9Mbps,12Mbps,18Mbps,24Mbps,36Mbps, 48Mbps and 54Mbps
  • IEEE802.11b
    • Transmission Type – DSSS
    • Bandwidth – 20MHz
    • Frequency Band – 2.4GHz, supporting standard channels
    • Base Rate (Control Rate) – 1Mbps
    • PHY Rates - 2 Mbps, 5.5 Mbps and 11 Mbps
  • IEEE802.11g
    • Transmission Type – OFDM
    • Bandwidth – 20MHz
    • Frequency Band – 2.4GHz, supporting standard channels
    • Base Rate (Control Rate) - 6Mbps
    • PHY Rates - 9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps and 54Mbps
  • IEEE802.11n
    • Transmission Type – HT, supports packet aggregation and MIMO with upto 4*4 transmitting and receiving antennae
    • Bandwidth – 20/40MHz
    • Frequency Bands – 2.4/5GHz, supporting standard channels
    • Base Rate (Control Rate) – 7.2Mbps
    • PHY Rates - upto 288.8Mbps for 20MHz bandwidth and 600Mbps for 40MHz bandwidth
    • Guard Interval – 400/800ns
  • IEEE802.11ac
    • Transmission Type – VHT, supports packet aggregation and MIMO with upto 8*8 transmitting and receiving antennae
    • Bandwidth – 20/40/80/160MHz
    • Frequency Band – 5GHz, supporting standard channels
    • Base Rate (Control Rate) – 7.2Mbps
    • PHY Rates - upto 346.8Mbps for 20MHz bandwidth, 800Mbps for 40MHz bandwidth, 1733.2Mbps for 80MHz bandwidth and 3466.8Mbps for 160MHz bandwidth
    • Guard Interval – 400/800ns
  • IEEE802.11p
    • Transmission Type – OFDM
    • Bandwidth – 10MHz
    • Frequency Band – 5GHz, supporting standard channels

PHY States: RX_OFF, RX_ON_IDLE, RX_ON_BUSY, TRX_ON_BUSY, SLEEP

SNR / BER / PER Calculation
Each packet received is probabilistically evaluated for successful or failed reception. The probability depends on the modulation and on the signal to interference noise ratio for the packet.

Received Signal strength is calculated as transmit power less RF propagation losses. The propagation losses include pathloss, fading and shadowing.

Interference is calculated by keeping tracks of all other received signals, thereby computing interference power for each packet when a reception decision has to be made.

The bit error rate (BER) is the number of bit errors divided by the total number of transferred bits. BER is calculated using as SNR – BER tables for different modulation schemes.

Path Loss Models:

  • Friis Free Space
  • Log Distance
  • COST231 HATA Suburban
  • COST231 HATA Urban
  • HATA Urban
  • HATA Suburban
  • Indoor Office
  • Indoor Factory
  • Indoor Home

Fading Models

  • Rayleigh,
  • Nakagami

Shadowing Models

  • Log-Normal
  • Constant

Not Supported / Limitations

  1. Association, probing, beaconing
  2. MSDU aggregation
  3. Directional Antennas
  4. Beamforming
  5. PLCP preamble reception
  6. Propagation model source codes are not open to user
  7. SNR – BER modulation tables source codes are not open to user

Source Code: Protocol Source C code with DLL interfacing for simulation in the loop debugging.

Traffic Generator

  • File Transfer Protocol (FTP)
  • Database Application
  • Voice Traffic
  • Video Traffic
  • Custom Model: Users can develop custom application model based on Packet size and inter-arrival time available in the following probability distributions
  • Email
  • HTTP
  • Peer to Peer
  • CBR
  • Application encryption using AES and DES algorithms

Background: Grid / Map

Simulation Results

  • Network Metrics, Link metrics Application metrics, Protocol Specific metrics for each protocol, and Forwarding tables.
  • Metrics include throughputs, Delays, Data & control packet information and protocol specific Results
  • Graphical plots over time for link and application throughputs and TCP congestion window

Command Line Interface – CLI

  • CLI mode of running for more concise and powerful means of control
  • Facilitates use of automated scripts for running batch simulations
  • Model network configurations using XML based configuration files

Packet Animation

  • Animates packet flow over wired and wireless links, as well as node movement
  • Color variation for data, control and error packets
  • Animation settings via play, pause and time-slide
  • 25+ info fields now available with packet animator.
  • Wide range of animation options including plots, battery level, graphs, tables and more.
  • Visualization with inbuilt graphs for link and application throughput.
  • Graph controls with Colouring, XY Axis settings, Grid Settings, Zoom and more.