Fast Secure Handover on Layer 3 CBTC Networks

  • For long-range rail lines, the wayside network consists of several subnets distributed across multiple base stations. The risks of CBTC service can be minimized by using redundant links to each train. A radio CBTC network consists of onboard radio and wayside radio APs. Wayside APs are connected to different subnets by linking physically to station routers. Onboard the train, two clients are placed at each end of the train for redundancy. Each client associates with different wayside APs, and only one radio link is active at a time. To secure communications across subnets, Moxa’s L3 wireless access controller (WAC-2004) enables a Layer-3 handover delay of less than 50 ms, seamlessly exchanging the data needed for safe operations between train and ground.

    Layer 3 CBTC
  • Network Requirements

    • Layer 3 roaming (handoff <50 ms) for cross-subnet mobility
    • Adaptable to various wayside antenna scenarios:
      ▫ Waveguide scenario: waveguides or leaky cables are
         installed along the track
      ▫ Free propagation scenario: antennas are positioned at
         distinct points along the track
  • Moxa Solutions

    • Rugged trackside wireless unit
      ▫ Complete integration solution of dual radios, managed fiber    Ethernet switch with AC power supply.
    • Sub-50 ms Layer 3 Turbo Roaming:
      ▫ WAC-2004 Layer 3 wireless access controller enables    crosssubnet roaming
      ▫ Inter-controller roaming
      ▫ IEEE 802.11i-compliant wireless security
      ▫ Redundancy via hot standby controller
    • Universal roaming scheme up to support a variety of wayside propagation modes

EN 50155 Products:

    TAP-6226 Series Rugged Trackside Wireless Unit
    TAP-6226 Series
    Rugged Trackside Wireless Unit
  • Two dual-band IEEE 802.11a/b/g compliant
  • Railway approved IP68 housing
  • Controller-based Turbo Roaming
  • Two fiber ports with Turbo Chain and four M12 ports with PoE
  • High transmit power for extended reach
  • -40 to 75°C operating temperature range
  • Compliant with essential sections of EN 50155
    WAC-2004 Layer 3 Wireless Access Controller
    WAC-2004
    Layer 3 Wireless Access Controller
  • 2-in-1 AP controller and Mobile IP home agent
  • Millisecond-level controller-based Turbo Roaming
  • IEEE 802.11i-compliant wireless security
  • Layer-3 Mobile IP technology
  • Up to 450 Mbps throughput for tunneling
  • Scalable tunneling capacity
    AWK-3121-RTG Series Industrial IEEE 802.11a/b/g Wireless AP/Client
    AWK-3121-RTG Series
    Industrial IEEE 802.11a/b/g Wireless AP/Client
  • QoS (WMM) and VLAN for efficient network traffic
  • Supports controller-based Turbo Roaming
  • Compliant with essential sections of EN 50155
  • M12 anti-vibration connectors (AWK-3121-M12-RTG)
  • -40 to 75°C operating temperature range (T models)
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