Background
Shenzhen is one of the largest city in china and Top 10 worldwide busiest metro with more than 1 billion passengers every year. The high traffic volume requires a stable and powerful communication system to offer a smooth passenger transportation experience.
Hytera was awarded the contract , Shenzhen metro phase III ( Line 7,9,11) with total 108KM and 69 metro stations, to deliver a tetra digital radio communication system(800Mhz) with ACCESSNET-T IP technology for Train routing operation and DMR trunking system(400Mhz) for station service management.
User
Shenzhen Metro, China
Market Segment
Metro
Project Time
2014
Product
ACCESSNET-T IP
72 DS6210
The Challenge
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Providing a cross-system radio communication interface between phase III TETRA radio system and existing lines' TETRA radio system built by the other manufacturer was the first problem Hytera met. .
Besides this , the Integration of TETRA system to new control center NOCC and Migration of the existing Line network and control center during Metro operation is also a big challenge.
The Solution
Hytera ACCESSNET-T IP mobile radio system for the Shenzhen metro mainly consists of:
--72 base station are connected to the switching node via the IP backbone.
--2 set IPN switch nodes are switched redundant to each other , Based on the additional geographic redundancy, even the failure of an entire IPN site does not limit the radio operation.
--The newly-built OCC includes 27 multi-user customized dispatcher systems to meet their high level requirements.
-- 1500 portable , 80 fixed station and 266 train-borne
Hytera will also provide DMR trunking production used for station service management like security , cleaning and station staff, with 1 set DMR switch center, 72 BS, 1950 portable.
Both Tetra and DMR signal will be combined transmitting by leaky coaxial cables (LCX) along whole elevated viaduct and underground tunnel trackside to ensure good signal coupling and constant line of sight between transmitter and receiver.
Highlights
1/ Comprehensive range of redundancy
The particularity of the system for Shenzhen Metro is the high level of reliability which is achieved by Geographical redundancy of the switching unit, redundancy of control channel and fallback operation of the base stations , it allow continuously voice and data communication even in the event of failure of entire sites.
2/ One-Stop Service
Whatever the needs or the challenges of the MRT customers they have, Hytera can offer sincere and tailored solutions for their radio communications with complete MRT product line, including the standard TETRA infrastructure, dispatcher & train-borne, plus abundant coverage design and on-site experience in the process of construction.
3/Interface to other TETRA system
A strong point of our solution is that necessary voice/message service between the existing network and Hytera TETRA network can be realized, using the client's existing mobile radio terminal connected to our multifunctional server equipped with A-CAPI software interface.
