A kind of cable tunnel communication system based on LTE WiMAXTechnical field
The present invention relates to a kind of cable tunnel communication systems based on LTE WiMAX.
Background technique
With the continuous improvement of urban power load density, in addition coherence request of the urban planning to power transmission line corridorIt is increasingly stringenter.The highest form that cable tunnel is laid as ultra-high-tension power transmission line, because its is environmental-friendly, section transmission capacity andThe features such as feeder number is big has been more and more widely used in the power grid construction of large- and-medium size cities.
It, at least can configuration surroundings condition, fire-fighting, water level, pernicious gas inspection in the high-tension cable Tunnel Engineering to have put into operationSurvey, entrance it is antitheft and its detection etc. a series of sensors, several synthetical collection devices are configured as unit of region and acquire thisThe information of a little sensors, and the system host of main control room is transmitted to by several acquisition devices by wired system, for dataBackground monitoring after processing analysis.
Since tunnel has the characteristics that long-distance distributed, cause number of sensors very huge, synthetical collection device also needsIt largely to configure.According to engineering reality, sensor, the control signal wire cable of collector and optical cable investment have been even more than sensorWith collector itself, construction efficiency is low.
Current cable tunnel monitor supervision platform has following defect:
1. data are converged to master control room host process decision by sensor and collector, inefficiency redundancy is low.
2. amount of wiring is big, affiliated facility accounts for gross investment ratio height, repair and maintenance heavy workload.
3. function expansibility is poor, if to increase sensor or collector newly, new route and installation communication equipment is needed, is constrainedThe opening and scalability of system.
4. sensor and collector due to being all uploaded to master control room host, lack information sharing between sensor, in host orIt cannot play a role after station level communication failure, be unsatisfactory for the requirement of power information redundancy, constrain Internet of Things in cable tunnelIn application.
Therefore, it is necessary to design a kind of novel cable tunnel communication system.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of cable tunnel communication system based on LTE WiMAX,The cable tunnel communication system based on LTE WiMAX is easy to implement, and scalability is strong, and signal coverage rate is high, and capacity is big.
The technical solution of invention is as follows:
A kind of cable tunnel communication system based on LTE WiMAX, including LTE system core network device, leakage electricityCable and multiple sensors；The sensor is used to acquire the status information in tunnel；
LTE system core network device is connected with leakage cable；It reveals cable and issues wireless signal；Leakage cable is equipped withConvenient for disseminating the fluting of wireless signal；Sensor and leakage cable wireless communication connect.
The sensor includes environmental conditions ensor (such as Temperature Humidity Sensor), fire-fighting sensor (such as cigarette propagated sensationSensor incudes the sensor etc. of open fire), water level sensor, harmful gas sensor (such as nitric oxide sensor), entranceAt least one of antitheft and detection sensor (human body sensor, such as infrared sensor).
Tunnel whole process lays single leaky cable.
The working frequency range 223.025-235Mhz of cable tunnel communication system, using TDD duplex mode, radio-frequency channel bandwidth8.5Mhz。
It reveals cable and also wirelessly communicates connection with the controller of cable tunnel monitoring system；The controller and cable tunnelThe collector of road monitoring system is connected；If collector has wireless communication function, collector and leakage inductance can be directly wirelessCommunication connection.
Acquisition control is cable tunnel monitoring system, and collector refers to acquisition cable tunnel operation initial data, controllerFinger summarizes multiple collector data and is controlled.
LTE system core network device is deployed in high voltage substation communications equipment room or main control room, LTE system core netNetwork integration of equipments has the network unit for supporting SGSN&MME, GGSN&S/P-GW, CG, DNS, HLR&HSS and PCRF.
LTE system core network device has the interface of energy direct-coupling leaky cable, is also equipped with optical fiber interface, describedOptical fiber interface zooms out device or distributed base station RRU+BBU for zooming out signal to far end radio frequency, by remote radio device or dividesCloth base station RRU+BBU is coupled to another leakage coaxial cable, completes relaying of the information in leaky cable.That is LTE systemCore network device is available to be directly connected with leakage coaxial cable, can also be connected by optical fiber interface with leaky cable.
Leakage cable is discrete type leakage coaxial cable.It is divided into multistage along its length, slotted section and does not openThe section of slot is arranged alternately
LTE system core network device and cable tunnel monitoring system (the referred to host of system) communicate to connect.
230M is the dedicated frequency ranges of industries such as Ministry of Industry and Information's authorization electric power, belongs to valuable low-frequency range resource, and LTE standard is mature to transportDevelopment of the commercialization in major operator 4G network, with electric system to wireless communication needs, it is necessary to introduce superior LTEPower grid automation field.
LTE is the abbreviation of English Long Term Evolution.LTE is also known as 3.9G by popular, has 100MbpsData download capabilities, be considered the mainstream technology from 3G to 4G evolution.It improves and enhances the aerial access technology of 3G, adoptsUse OFDM and MIMO as the sole criterion of its wireless network evolution.Downlink is capable of providing under 20MHz spectral bandwidthThe peak rate of 100Mbit/s and uplink 50Mbit/s.
For system global structure figure referring to Fig. 1, LTE core network equipment is the hinge of whole system, its one end passes through EthernetIt accesses " cable tunnel monitoring system "；The other end is handed over by the communication that leaky cable completes the underlying devices such as sensor, collectorIt changes.
Since cable tunnel is relative to other industrial buildings, information content is less and terminal is fixed, therefore selects low side tightGather type LTE system core network device, which is mainly responsible for the mobile management of control plane, including on userHereafter with moving condition management, distributing user temporary identifications, authentication management etc..Compact core net is according to electric system featureIt is deployed in high voltage substation communications equipment room or main control room, equipment of the core network cabinet, which should integrate, supports SGSN&MME, GGSN&S/Multiple network elements such as P-GW, CG, DNS, HLR&HSS and PCRF reduce computer room land occupation, drop to improve the integrated level of equipment of the core networkLow equipment cost.
Equipment of the core network carries multiple interfaces mode, can couple directly to leakage coaxial cable of the present invention,Have optical fiber interface to zoom out to distal end distributed base station RRU+BBU, the leakage coaxial cable be coupled to by RRU+BBU,Complete transmission of the information in leaky cable.
By its slot, outwardly radiated electromagnetic wave is arranged in cable tunnel top layer cable to exchange information to leaky cableBracket outer, completes the transmission and wireless transmission of signal, and tunnel whole process lays single leaky cable., realize tunnel radio communicationAll standing.All IED equipment in tunnel(intelligent electronic device)As sensor, controller and collector can pass through leakage electricityThe wireless signal that cable disseminates accesses " cable tunnel monitoring system " by equipment of the core network.
" cable tunnel monitoring system " refers to computer supervisory control system a set of in this way, is generally divided into station level equipment and processLayer equipment.Wherein station level equipment contains various processing servers, communication interface server, by two-way with aforementioned equipment of the core networkInformation realization and process layer devices combined network communication are exchanged, finally by the smart machines such as all the sensors, controller in cable tunnelInformation concentrated collection and centralized decision-making system；Process layer devices it is common configuration generally comprise: video monitoring, fire alarm,HVAC, gaseous environment, security protection etc. are drained, they complete the measurement and control of essential information, such as obtain video information or startingExhaust system etc., process layer devices are obtained by embedded or external CPE (wireless terminal accessing device) from leakage coaxial electricalThe wireless signal distributed in cable, is transmitted to equipment of the core network above-mentioned therewith after two-way exchange, above see off control layer analysis decision orExecute down order.
The type selecting of leaky cable
The present invention fully takes into account the discreteness of cable tunnel monitored object, and the special distribution extremely low with insertion loss is let outCoaxial cable is leaked, i.e. leakage coaxial cable is had the place of information requirement to slot by coaxial cable in cable tunnel, is formed and is corresponded toIn the discrete type leakage coaxial cable of monitored object, theoretical loss is about 0.25dB, structure such as Fig. 2 institute in cable tunnelShow.
The present invention uses the leakage coaxial cable for the design of dedicated frequency range, usually solid under the frequency multi-band environment of lte230MThe loss for determining frequency leakage cable comprehensively considers diectric attenuation+attenuation+conductor itself decaying, the decaying of leakage coaxial cableConstant α can be taken as 2.2dBkm, and system loss is α max.=α s+M=α × L+Lc+M then L=(α max.-Lc-M) ÷ α, withFor 230Mhz, consider surplus M=45dB, coupling loss Lc=75, design maximum system loss α max.=135dB whenIt waits, obtains L=(135dB-75dB-45dB) ÷ 2.2dB/KM=6.82km；
By the above theory analysis, the theory effectively coverage distance of monomer system is about 6.82km, it is contemplated that tunnel closingDome structure itself helps increasing effect to leaky cable coupling performance, and actual transmissions Distance Theory value is able to satisfy up to 7km or soThe requirement of most cities cable tunnel.
Specifications
Working frequency range 223.025-235Mhz of the present invention, using TDD duplex mode, radio-frequency channel bandwidth 8.5Mhz can be propped upHold the online user number of maximum 2000 information points, user refers to the end of the needs wireless communications such as controller above-mentioned, sensorEnd equipment, design sensitivity -120dB, terminal cpe side hardware circuit solution 1.85Mbps.Cable tunnel monitoring system can be metIn all process layer devices to transmission bandwidth, quality and sensitivity requirement.
For apart from longer cable tunnel, the transmission range for revealing cable due to one section is limited, need using one orMultiple remote radio devices are relayed, referring to Fig. 3, remote radio device be arranged in core equipment (such as combiner) wire transmission away fromFrom interior, remote radio device can also be connected by optical fiber with core equipment, and the power supply of remote radio device is derived from tunnel intraoral illumination electricityRelaying of the signal in leaky cable is completed in source.
The utility model has the advantages that
Cable tunnel communication system based on LTE WiMAX of the invention is a communication system platform, is had followingAdvantage:
(1) it supports cable tunnel acquisition layer to realize that information uploads and information exchange is shared, supports Internet of Things in cable tunnelIn application.
(2) wireless communication coverage needed for this system solves cable tunnel monitoring system with low cost.
(3) the LTE core network equipment of 230M frequency range is used, is wirelessly communicated dedicated for the cable tunnel of electric system.
LTE230 is ratified based on Ministry of Industry and Information to the dedicated frequency range of 230M of the systems such as electric power, low-frequency transmission distance, safety andFrequency range electromagnetic interference will not be caused to other wireless systems.
(4) in the case where selecting 230Mhz to determine frequency leakage coaxial cable, the discrete fluting way arranged using the present invention,Leakage coaxial cable transmission range can be made up to 7km, such covering radius is highly suitable as cable tunnel monitoring systemThe communications platform of system takes full advantage of the dedicated low-frequency resources of the distinctive 230M of power industry.
(5), the system expandability is strong, capacity is big, meets a variety of auxiliary monitoring systems of large tunnel to real-time communication, peaceThe requirement of full property and reliability.
System of the invention can further genralrlization into city integrated piping lane.Underground pipe gallery refers to be used in Urban UndergroundIn the public tunnel for concentrating the municipal pipelines such as laying electric power, communication, radio and television, water supply, draining, heating power, combustion gas.
Detailed description of the invention
Fig. 1 is the general structure schematic diagram of the cable tunnel communication system based on LTE WiMAX；
Fig. 2 is the structural schematic diagram of leaky cable.
Fig. 3 is the general structure schematic diagram for having the cable tunnel communication system of radio frequency remoto module.
Specific embodiment
The present invention is described in further details below with reference to the drawings and specific embodiments:
Embodiment 1:
Such as Fig. 1-3, a kind of cable tunnel communication system based on LTE WiMAX, including LTE system core network are setStandby, leakage cable and multiple sensors；The sensor is used to acquire the status information in tunnel；
LTE system core network device is connected with leakage cable；It reveals cable and issues wireless signal；Leakage cable is equipped withConvenient for disseminating the fluting of wireless signal；Sensor and leakage cable wireless communication connect.
The sensor includes environmental conditions ensor (such as Temperature Humidity Sensor), fire-fighting sensor (such as cigarette propagated sensationSensor incudes the sensor etc. of open fire), water level sensor, harmful gas sensor (such as nitric oxide sensor), entranceAntitheft and detection sensor (human body sensor, such as infrared sensor).
Tunnel whole process lays single leaky cable.
The working frequency range 223.025-235Mhz of cable tunnel communication system, using TDD duplex mode, radio-frequency channel bandwidth8.5Mhz。
It reveals cable and also wirelessly communicates connection with the controller of cable tunnel monitoring system；The controller and cable tunnelThe collector of road monitoring system is connected；If collector has wireless communication function, collector and leakage inductance can be directly wirelessCommunication connection.
Acquisition control is cable tunnel monitoring system, and collector refers to acquisition cable tunnel operation initial data, controllerFinger summarizes multiple collector data and is controlled.
LTE system core network device is deployed in high voltage substation communications equipment room or main control room, LTE system core netNetwork integration of equipments has the network unit for supporting SGSN&MME, GGSN&S/P-GW, CG, DNS, HLR&HSS and PCRF.
LTE system core network device has the interface of energy direct-coupling leaky cable, is also equipped with optical fiber interface, describedOptical fiber interface zooms out device or distributed base station RRU+BBU for zooming out signal to far end radio frequency, by remote radio device or dividesCloth base station RRU+BBU is coupled to another leakage coaxial cable, completes relaying of the information in leaky cable.That is LTE systemCore network device is available to be directly connected with leakage coaxial cable, can also be connected by optical fiber interface with leaky cable.
Leakage cable is discrete type leakage coaxial cable.It is divided into multistage along its length, slotted section and does not openThe section of slot is arranged alternately；LTE system core network device and cable tunnel monitoring system communicate to connect.