Urban Rail Signal DCS Network Solution

  • The Data Communication System (DCS) network carries both wired and wireless network services. The wired network services include automatic train supervision (ATS), automatic train protection (ATP), interlocking, and Maintain Support System (MSS) services, which are carried through Layer 2 private networks. According to the requirements of customers and integrators, several services can be carried on one Layer 2 private network or on separate Layer 2 private networks. Wireless network services are generally carried in WiFi or Long Term Evolution (LTE) mode. The E2E L3VPN solution is recommended for the LTE network. The E2E VPN solution is mature for the LTE network, and the Layer 3 solution prevents broadcast storms.
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The traditional vehicle-ground wireless communication network adopts Wi-Fi. Wi-Fi uses an open frequency band, which is vulnerable to interference. The Wi-Fi solution is evolving towards Long Term Evolution (LTE). The DCS subsystem provides data communication channels, including the ground wired network, vehicle-ground wireless network, and vehicle communication network, for the CBTC system.

  1. The DCS network carries both wired and wireless network services. The wired network services include ATS, ATP, interlocking, and MSS services, which are carried through Layer 2 private networks. According to the requirements of customers and integrators, several services can be carried on one Layer 2 private network or on separate Layer 2 private networks.
  2. Wireless network services are generally carried in Wi-Fi or LTE mode. The Wi-Fi bearer solution is the same as the bearer solution for wired network services. The E2E L3VPN solution is recommended for the LTE network. The E2E VPN solution is mature for the LTE network, and the Layer 3 solution prevents broadcast storms.
  3. The Atom GPS + 1588v2/G.8275.1 solution provides time synchronization and renders simple deployment and a low cost.
  4. CTBC services are carried over GRE tunnels between Train Access Units (TAUs) and border routers (BRs) to isolate main line services (CBTC) from testing line services, ensuring train operation security.
  5. Passenger information system (PIS) multicast services are also carried over GRE tunnels between TAUs and BRs. This compensates for the drawback of multicast-incapable core network devices and facilitates multicast deployment and O&M.

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