Huawei eLTE Solution for Heavy Haul Railway - ActForNet eLTE Solution for... · Huawei eLTE...
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Huawei eLTE Solution for Heavy Haul Railway
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Version No.: M3-038477-20150116-C-2.0
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Overview
Background-New Challenges for Heavy Haul Railway
The application of the capacity-increasing technology on the heavy haul
trains raises new challenges for railway mobile communications. Stable,
reliable access to mobile communications on higher capacity trains requires
larger, more reliable train-to-ground broadband to reliably extend support for
existing GSM-R services and new services. Heavy haul railway safety issues,
such as the need for comprehensive track monitoring, increases the load
on traditional mobile telecom systems. New techniques and technologies, a
new broadband telecommunications system, is needed to break through the
limitations of the old system.
The Solution-eLTE
With LTE, railway operators can start shifting their dedicated wireless
networks from GSM to LTE. The Huawei broadband eLTE network for heavy
haul railway has high reliability, high bandwidth, short delay, and excellent
mobility. It can guarantee higher capability and safer operation.
Huawei eLTE Solution for Heavy Haul Railway|1
CN Redundancy
Masterlocomotive
Slavelocomotive
Controllabletrain tail
NMS
OCU+CIR OCU+CIR
eCNS1 eCNS2
RRU
BBU
RRU
BBU
RRU
BBU
Front Middle Rear
Voice dispatchingserver
CTC server
Locomotivecontrol server
Solution&Application Scenarios
Application 1: Multi-locomotive synchronous control to improve train capacity
The increased length of heavy haul trains results in a greater distance between locomotives. The master locomotive at the front needs
to be able to communicate with the controllable tail at the back, to solve the longitudinal impulse problem of long trains. Traditional
telecommunications systems are not up to this task.
With Huawei LTE wireless system, multi-locomotive synchronization system for heavy haul trains is able to link cars over 2500m apart
and can do it with less than 100ms of delay.
The locomotive synchronization system is made up of an on-board communication unit (OCU), a controllable train-tail, a ground
wireless multi-locomotive server, and an LTE network.
Application 2: Voice dispatching to increase inter-departmental efficiency
The Huawei LTE-based communications and dispatching system not only provides all of the standard voice dispatching functions of a
GSM-R based system; it can also interwork with FAS to support dynamic group calls between locomotives. Voice dispatching can:
Enhance interdepartmental efficiency between the dispatchers, various attendants, engineers, emergency workers and other related personnel.
Provide voice dispatching services, telephone services at the station and the yard, and telephone services between stations. It supports
personal calls, emergency calls, and group or conference calls.
Include vehicle terminal CIR and handheld terminals, an FAS dispatching console, a trunking dispatching console, a trunking server, and
an LTE network.
Application 3: Video surveillance and running status monitoring to guarantee operational safety
The LTE network can be used to conduct on-board video surveillance and status recording from the command center. This surveillance can
assist in handling emergency situations and in making evaluations of responsibility after events.
Real time surveillance over important roadways
Real time on-board video surveillance
Real time running status reporting
Multi-locomotive synchronous
control
Station and yard dispatching
Driver dispatching On-board video surveillance
Train status monitoring
Command centerControllable train tail
Major Roadway video surveillance
With wide coverage, short delay, and high bandwidth, as well as its IP platform, the eLTE solution can
use a single network to support multiple functions.
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Multiple Levels of Network Redundancy
Secure and reliable communications are core issues for heavy haul railway telecommunications.
The eLTE heavy haul broadband mobile telecom system must transmit train control signals such as synchronous control signals and
controllable train tail signals. In addition, it transmits signals for dispatching commands, train number checking, and emergency calls. These
services are all necessary to ensure train safety. This is why Huawei designed an LTE solution with enhanced reliability built in on three
levels: network architecture, key network elements, boards and modules. They all have been designed with automated backup systems and
redundancies that enhance the overall reliability of the LTE system to 99.999%.
Service Prioritization
Service prioritization ensures that when the system is overloaded, important services are preferentially guaranteed. Various LTE QoS
mechanisms are implemented so that, when the network is congested, eNodeBs and the evolved packet core (EPC) use mechanisms such
as admission control, congestion control, and service pre-emption to ensure that high-priority services such as locomotive synchronization
control, train tail control, and emergency calls remain unaffected.
Railway Voice Dispatching over IP
The LTE QoS mechanism guarantees reliability of CS services over the PS bearer, and has allowed for trunking dispatching communications
performance to reach that over GSM-R, with some performance indexes even better. Moreover, it provides other railway-specific functions
such as functional number, cell location based routing, call matrix, and emergency call. The railway trunking dispatching solution is highly
reliable. It provides a trunking dispatching server with dual-center functionality. In order to better satisfy the requirements for convenient
operation of heavy haul rail, group call for multi-locomotive train drivers has been introduced to allow drivers to quickly establish high
quality VoIP connections with each other. New safety measures have been introduced as well. During construction or in emergency
scenarios, there is an 800 meter buffer zone with temporary group call which can be effectively extended beyond that.
Dual-Network Coverage
A dual network load sharing design is employed to ensure that heavy haul railway safety services are never interrupted and to double the
frequency usage. When a transmission link between a UE, eNodeB, or the EPC, malfunctions, dual-network redundancy guarantees that
synchronization control and train tail services continue uninterrupted. Two networks can bear voice dispatching services for different CIRs
and handheld devices. In addition, this dual network design provides twice the bandwidth utilization of the traditional active-plus-standby
network configuration and more robust support for network services.
Robust Network
The eLTE solution is based on advanced LTE technology, and can achieve downlink data rate of 100 Mbit/s and uplink data rate of 50 Mbit/s. The
system uses the cell combination feature to reduce the total number of handovers and extend cell coverage areas. This extends the single
site coverage and reduces the probability of service drops because handovers or cell reselections are not required when UEs move between
the coverage areas of the RRUs. Moreover, the ability to reduce interference has improved significantly through interference rejection
combining (IRC) advanced receiver technology, effectively increasing network quality.
Interworking with FAS and CTC
The connection between the PoC server and the FAS switching center provides unified dispatching between wired and wireless systems. The
PoC trunking server is connected to the EPC and interconnects with the FAS through the E1 port. A handheld trunking terminal can access
the LTE network, the PoC trunk server and the FAS primary systems to establish a VoIP connection between the PoC handheld terminal and
the FAS dispatching system.
To guarantee that each locomotive is bound to a specific IP, the system needs to assign fixed IP addresses to end terminals so that, during
load sharing between base stations or EPCs, IP addresses remain static. Huawei eLTE solution uses proprietary technologies to assign static
IP addresses in such scenarios and interconnect the LTE system and the railway CTC system.
To guarantee safe and efficient operations, LTE for heavy haul railway flexibly adapts to the varying
demands of each LTE public network with a variety of high tech solutions.
Solution Highlights
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The network management system provides carrier level management for a wide range of wireless network elements, including the eNodeBs and core network(eCNS600).
Performance management Fault management Configuration management Security management Log management Resource management Alarm Management
The MDS6800 application server is a POC server for voice dispatching.TDM/IP dual-network architecture: supports the circuit /IP dual network frameworkHigh reliability: the dual standby mechanism, all modules support the hot standby and hot pluggingMaintainability: convenient and reliable upgrading of services Safety protection design: class III lightning protection, high resistance to electromagnetic interferenceHigh quality design: EMC/EMI, heat dissipation, dustproof design, MTBF>=37 yearsHigh capacity, high performance: BHCA value >680000 times/H, call loss <1/100000Terminal diversification: supports a series of dispatching terminals
Network Management System
M2000/U2000Application Server
MDS6800
The EM350 is a Mini PCIe data module based on the TD-LTE technology, used for secondary development of terminals for customers.
Standard mini PCIe slot, handy adaption for PDA, Pad, video camera and other industrial devices, supports trunking and data transfer by wireless data interface400MHz/800MHz/1.4GHz/1.8GHz/3.5GHz Supports industry customized secondary development and flexible uplink and downlink timeslot ratios: 1:3, 2:2 and 3:1
Mini PCIe Data Module
EM350
The eCNS600 is a compact EPC which integrates the functions of MME, S-GW/P-GW and HSS into only one subrack. It provides large throughput and subscriber management ability to meet railway needs.
Maximum subscribers: 200,000 Maximum eNodeBs: 1,500 Maximum throughput: 40Gbps (1024 bytes per packet) Dimensions (H x W x D): 620 mm x 442 mm x 437 mm Geographic redundancy, charging, roaming
The DBS3900 is an eLTE distributed base station. It is composed of two basic modules: BBU and RRU, which can be flexibly deployed to meet diverse deployment requirements.
Frequency (Hz): TDD 1.4G/1.8G/2.3G/2.6G/3.5G/3.7G Bandwidth (Hz): 5M/10M/15M/20M Weight: BBU < 12 kg, RRU < 24 kg One BBU supports 12 RRUs Installation mode: Mounted on tower/on pole/against wall/on rooftop
Core Network
eCNS600Base Station
DBS3900CPE
eA660
The eA660 is an outdoor LTE CPE for broadband access, featuring remote management for easy deployment of current and future broadband resources and centralized fault detection and recovery.
Frequency (Hz): TDD 1.8G/2.3G/2.6G/3.5G/3.7G Dimensions (H x W x D) : 280 mm x 250 mm x 90 mm Ingress protection rating: IP67 Working temperature: -40ºC to 65ºC Shock proof: IEC61373 & MIL-STD-810F Power consumption: < 25W
The eH701 is a professional trunking terminal.Supporting T9 keyboard Technical standard: LTE 3GPP Release 9 Size: 140x60x35 mm (not including external antenna) Weight: ≤ 360g with battery Working temperature: -25ºC to +60ºC Battery: LI-ion, 3.7v, 4000mAH Peak power consumption : < 4W
Handheld Terminal
eH701
Products
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The nearly 600-km long Shuohuang Railway is the longest heavy
haul railway ever constructed by the Shenhua Group, the world’s
largest coal supplier and a Fortune 500 company. In order to
service the Chinese economy’s demand for coal, the Shuohuang
Railway must see an increase in annual transportation capacity
to 350 million tons, meaning the capacity of a single train trip
needs to increase from 5,000 tons to 25,000 tons. Operating such
huge, heavy haul trains requires synchronization between multiple
locomotives. Meanwhile, the controllable train tail must be jointly
acted with locomotive braking to solve the longitudinal impulse
problem of heavy haul trains. This extends the communication
distance requirement between the master and slave locomotives to
over 2,500m. The existing analog communications system cannot
meet this requirement.
World’s First LTE Network in a 25,000-ton Heavy Haul Train
With wide coverage, short delay, and high bandwidth, the Huawei
eLTE solution for the Shuohunag Railway uses a TDD LTE network
to successfully implement multiple-locomotive control over the
25,000-ton trains, extending transmission distance and reducing
latency. To achieve high levels of reliability, the Huawei eLTE network
provides a fully redundant solution to ensure 99.999 percent system
availability. Innovative dual-network coverage and multiple-priority
QoS mechanisms contribute to preventing any interruptions in
railway operations. Meanwhile, the Shuohuang Railway has also
achieved whole-line dispatching and driver room video surveillance,
significantly enhancing dispatching efficiency and operational
safety. The successful application of Huawei’s eLTE system in the
Shuohuang railway is an innovation in the field of heavy haul rail
communications, and serves as a role model in both China and the
world for the development and operation of heavy haul rail.
The LTE network has established a good
foundation for the future transportation
capacity of more than 350 million tons,
along with enhanced communication and
network security.
Cao Yanping
Deputy General Manager of
Shuohuang Railway Development Co., Ltd.
Voice of the customer
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