LTE / LTE - Advanced

Overview

NetSim Long-Term Evolution (LTE) Model Library provides high fidelity simulation of 4G / 4.5G cellular networks based on the 3GPP TS 36.xxx standards.
It includes models of nodes called MME (Mobility Management Entity), eNodeB (Base Station), Relay and UE (Mobile Station) and each has detailed MAC and PHY models. NetSim comes with source C code and features.

Devices

LTE comes with some LTE Specific devices like MME, eNB, UE and Relay along with Router, access point, L2 / L3 Switch switch, wired and wireless node.

LTE covers the following features:

  • Physical Layer
    • Protocol: LTE/LTE-Advanced. Standard: 3GPP 36 TS 36.213
    • Frequency Band: 700 MHz to 2.7 GHz
    • Bandwidth: 5/10/15/20 MHz
    • Modulation Techniques: QPSK, 16QAM, 64QAM
    • Downlink Access Scheme: OFDMA
    • Uplink Access Scheme: SC-FDMA
    • Duplexing: FDD
    • Frame Duration: 10 ms
    • SubFrame Duration: 1 ms
    • Slot Duration: 0.5 ms
    • Subcarrier Spacing: 15 kHz
    • OFDMA symbols per slot: 7
    • Transmission Mode Index: 0/1/2/3/4
    • Carrier Aggregation: Intra Band Contiguous/ Intra Band Non-contiguous/ Inter Band Non-contiguous
    • eNB antenna count support Tx, 1, 2, 4 and Rx 1, 2, 4
    • UE antenna count support Tx, 1, 2 and Rx 1, 2
    • No of Resource Blocks: 25 for 5 MHz BW, 50 for 10 MHz BW, 75 for 15 MHz BW, 100 for 20 MHz BW
  • MAC Layer
    • Types of Scheduling: Round Robin, Max Throughput, Proportional Fair
    • Multiplexing of MAC SDUs from one or different logical channels onto transport blocks (TB) to be delivered to the physical layer on transport channels
    • Demultiplexing of MAC SDUs from one or different logical channels from transport blocks (TB) delivered from the physical layer on transport channels
  • RLC (based on specification 36.322)
    • RLC Entity
      • TM (Transparent Mode): No RLC Header, Buffering at Tx only, No Segmentation/Reassembly, No feedback (i.e, No ACK/NACK)
      • UM (Unacknowledged Mode): RLC Header, Buffering at both Tx and Rx, Segmentation/Reassembly, No feedback (i.e, No ACK/NACK)
      • AM (Acknowledged Mode): RLC Header, RLC AM Buffer
    • Transfer of upper layer PDUs
    • RLC SDU discard
    • t-reassembly
    • t-pollRetransmit
    • Protocol Data Unit (PDU)
      • TMD PDU
      • UMD PDU
      • AMD PDU
  • PDCP based on specification 36.323
    • PDCP Entity
    • Transmit PDCP SDU
      • Sets the PDCP Sequence Number
      • Adds RLC Header
      • Calls RLC service primitive
    • PDCP Association
    • PDCP Discard, Header Compression, Maintenance of PDCP sequence numbers
    • Transmission Buffer
    • Receive buffer
    • Timers
      • t-Reordering Timer
      • Discard Timer
  • Channel Model
    • Propagation models (Based on 3GPPTR38.901)
    • 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
    • Shadow Fading: Log Normal
  • Network Layer
    • IPv4
  • Transport Layer
    • TCP with different variants (like Old Tahoe, Tahoe, Reno, New Reno, BIC CUBIC)
    • UDP
  • Application Layer
    • Different application protocols can be modelled here such as HTTP, CBR, Email, Video, Voice, FTP etc.
    • Routing Protocols for MME are RIP and OSPF
  • Mobility Model: Random Walk, Random Way Point, Group Mobility and File Based Mobility

Output Performance Metrics:

A variety of network performance is reported including
  • Network Metrics
  • LTE Metrics
  • IP metrics, TCP / UDP Metrics etc.
  • Application Metrics
  • Dynamic metrics (Graphical plot of an attribute over time) is available for application throughputs and individual link throughput also.

Additional Information

LTE Documentation (see the User Manual and LTE and LTE-A library)
Knowledgebase Q&A
File Exchange Link