CN104469802A - Underground coal mine distributed base station system based on TD-SCDMA - Google Patents
Underground coal mine distributed base station system based on TD-SCDMA Download PDFInfo
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- CN104469802A CN104469802A CN201410725487.XA CN201410725487A CN104469802A CN 104469802 A CN104469802 A CN 104469802A CN 201410725487 A CN201410725487 A CN 201410725487A CN 104469802 A CN104469802 A CN 104469802A
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- coal mine
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to an underground coal mine distributed base station system based on TD-SCDMA. The underground coal mine distributed base station system based on the TD-SCDMA comprises a base station controller and radio frequency units. The base station controller is connected with the radio frequency units through optical fibers. A superior interface of the base station controller receives baseband signals transmitted by a ground device, the baseband signals are processed through a central processing module, and the processed baseband signals are transmitted to the radio frequency units through subordinate interfaces. After the central processing unit of the base station controller receives the baseband signals transmitted by the radio frequency units through the subordinate interfaces, the baseband signals are fed back to the ground after being processed. The base station controller is provided with the multiple subordinate interfaces. Each subordinate interface is cascaded with multiple radio frequency units. A first optical module receives the baseband signals transmitted by the base station controller. A digital processing module outputs radio frequency signals obtained after the baseband signals are processed. A radio frequency receiving and transmitting module is in charge of transmitting the radio frequency signals and providing wireless coverage of a TD-SCDMA network.
Description
Technical field
The present invention relates to networking technology area, particularly a kind of underground coal mine distributed base station system based on TD-SCDMA.
Background technology
TD-SCDMA (TD-SCDMA (Time Division-Synchronous Code Division Multiple Access)) is the third generation (3G) mobile communication standard proposed by China, in May, 2000 first by International Telecommunication Association (ITU) approval, and one of three main standard being third place in the world third-generation mobile communication by 3GPP accreditation March calendar year 2001.This technology have employed a series of new and high technologies such as smart antenna, software radio, joint-detection, baton handover, high-speed packet access, and TD-SCDMA has that the availability of frequency spectrum is high, power system capacity is large, be applicable to Develop Data business, system cost is low, meet the outstanding advantages such as mobile technology developing direction.
The radio frequency unit remote technology used in TD-SCDMA, super base station is made to become possibility, it can connect the Transmit Receive Unit that several even dozens of is arranged in the radio-frequency front-end equipment of far-end, in order to connect an antenna or multiple antenna, support several to dozens of macrocell, Microcell and picocell simultaneously.When doing wireless network planning, can neatly according to coverage requirement composition mobile radio communication, this communication network cost is low, covering is good.Be particularly suitable for the various application occasions such as hot zones benefit is blind, in-door covering, underworkings covering.
As shown in Figure 1, be standard TD-SCDMA network structural representation traditionally.As can be seen from Figure 1, standard TD – SCDMA network is made up of equipment of the core network (CN), radio network controller (RNC), baseband processing unit (BBU) and remote radio unit (RRU) (RRU) several unit.Base Band Unit (BBU) can connect the Transmit Receive Unit that several even dozens of is arranged in the radio-frequency front-end equipment of far-end, supports several to dozens of macrocell, Microcell and picocell simultaneously.When doing wireless network planning, neatly according to coverage requirement, good mobile radio communication can be covered.
Along with colliery wireless communication system is to wireless speech, the demand of wireless video and wireless data service gets more and more.Need to design a set of wireless communication system being suitable for underground coal mine reliably and using, adopt TD-SCDMA technology to be good solution.
But, if the TD-SCDMA system of standard is directly applied to down-hole have Railway Project:
1) in order to system debug is convenient, equipment of the core network (CN), radio network controller (RNC) and Base Band Unit (BBU) three equipment need to be arranged in ground machine room, and remote radio unit (RRU) is arranged in down-hole.If networking so as can be seen from Figure 1, need Fiber connection between ground and down-hole, actual needs is how many remote radio unit (RRU)s, just needs how much to organize optical fiber.Wiring is complicated, and reliability reduces.
2) each remote radio unit (RRU) is in order to increase coverage, and design power is very large.But underground coal mine is not suitable for arranging powerful device for security needs, and this is a contradiction.
3) remote radio unit (RRU) wireless signal covers large, and coal mine tunnel structure is complicated.The wireless signal of wide coverage is owing to being subject to tunnel structure impact decay clearly, and actual coverage effect is not good.
Summary of the invention
For solving the problem of prior art, the present invention proposes a kind of underground coal mine distributed base station system based on TD-SCDMA, solves TD-SCDMA wireless communication system traditionally and directly applies to safety problem that underground coal mine occurs and the not good problem of wireless signal coverage effect.
For achieving the above object, the invention provides a kind of underground coal mine distributed base station system based on TD-SCDMA, described underground coal mine distributed base station system comprises ground installation and underground equipment, it is characterized in that, described underground equipment comprises base station controller and radio frequency unit, and described base station controller is connected by optical fiber with radio frequency unit;
Described base station controller, comprises central processing module, higher level's interface and subordinate's interface; The baseband signal that described in described higher level's interface, ground installation transmits, described baseband signal processes by described central processing module, by subordinate's interface by the extremely described radio frequency unit of the base band signal transmission after process, complete the configuration management of radio frequency unit, and the baseband signal that described central processing module is transmitted by radio frequency unit described in described subordinate interface, baseband signal processes by described central processing module, by higher level's interface by process after base band signal transmission to ground installation; Wherein, described base station controller has multiple subordinates interface, and described subordinate interface connects described radio frequency unit, the multiple radio frequency unit of each subordinate's interface cascade;
Described radio frequency unit, comprises the first optical module, the second optical module, digital signal processing module and radio-frequency (RF) receiving and transmission module; The radio signal transmission extremely described digital signal processing module that described radio-frequency (RF) receiving and transmission module will receive, described digital signal processing module exports baseband signal by after described radiofrequency signal process, and described baseband signal transfers to described base station controller through the second optical module; Described first optical module accepts the baseband signal of described base station controller transmission, and described digital signal processing module exports radiofrequency signal to after base band signal process, and emission of radio frequency signals is gone out by described radio-frequency (RF) receiving and transmission module, is responsible for the wireless coverage providing TD-SCDMA network.
Preferably, described radio frequency unit also comprises expansion interface; Described expansion interface, comprises personnel positioning interface and state instruction interface, for receiving other application messages, and expansion underground coal mine TD-SCDMA network application function.
Preferably, described higher level's interface and subordinate's interface realize by programmable gate array.
Technique scheme has following beneficial effect: solve traditional remote radio unit (RRU) low in underground coal mine wireless signal covering efficiency, constructional difficulties, the problems such as equipment power dissipation is large.Base station controller (RXU) and all dexterous miniaturization of radio frequency unit (DRU) design, this kind of distributed coal mine down-hole TD-SCDMA constructing communication network technology, have single base station signal area coverage wide (800m), maximumly zoom out distance 2km, single system can be overall length 33.6km tunnel and provides continuous covering.Down-hole just can descend flexible deployment up to 42 radio frequency units by base station controller.Not only arrange to underground equipment and bring convenience, also improve the coverage effect of downhole wireless signal greatly.And, remote radio unit (RRU) is more complicated than the remote radio unit (RRU) be made up of base station controller (RXU) and radio frequency unit (DRU) designed traditionally, the technical program reduces input cost, is applicable to the application of underground coal mine particular surroundings.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is standard TD-SCDMA network structural representation traditionally;
Fig. 2 is the underground coal mine distributed base station system fundamental diagram based on TD-SCDMA of the present invention;
Fig. 3 is that the present invention proposes a kind of underground coal mine distributed base station system based on TD-SCDMA;
Fig. 4 is of the present invention based on the base station controller block diagram in the underground coal mine distributed base station system of TD-SCDMA;
Fig. 5 is of the present invention based on one of radio frequency unit block diagram in the underground coal mine distributed base station system of TD-SCDMA;
Fig. 6 is of the present invention based on the radio frequency unit block diagram two in the underground coal mine distributed base station system of TD-SCDMA;
Fig. 7 be the present embodiment based on the base station controller block diagram in the underground coal mine distributed base station system of TD-SCDMA;
Fig. 8 be the present embodiment based on the radio frequency unit block diagram in the underground coal mine distributed base station system of TD-SCDMA.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, for of the present invention based on the underground coal mine distributed base station system fundamental diagram of TD-SCDMA.The operation principle of the technical program is: it is two physical equipments that the remote radio unit (RRU) RRU device in standard TD-SCDMA constructing communication network technology is redesigned, base station controller RXU and radio frequency unit DRU.The base station controller RXU of the technical program can have multiple light mouth to connect radio frequency unit DRU, and each light mouth can multi-stage cascade.Such as: base station controller RXU has 7 light mouths, the 6 grades of cascades of each light mouth, such stylobate station control can manage at most 42 stylobate stations (i.e. radio frequency unit DRU), and the tunnel length that the radio frequency unit of the technical program covers can reach 33.6 kilometers.And the remote radio unit (RRU) RRU before not improving only can cover the tunnel of 2 kilometers.So this scheme remote radio unit (RRU) RRU being designed to base station controller RXU and radio frequency unit DRU, just can the equipment of a very large transmitting power, be scattered in the equipment that many transmitting powers are less, not only greatly reduce production cost, be also more applicable to underground coal mine quorum sensing inhibitor and use.Not only cost performance is high, and owing to being distributed installation, so underground construction is convenient.
As shown in Figure 3, for the present invention proposes a kind of underground coal mine distributed base station system based on TD-SCDMA, described underground coal mine distributed base station system comprises ground installation 201 and underground equipment 202, and described underground equipment 202 comprises: base station controller 2021 and radio frequency unit 2022.
As shown in Figure 4, for of the present invention based on the base station controller block diagram in the underground coal mine distributed base station system of TD-SCDMA.Described base station controller 2021, comprises central processing module 1, higher level's interface 2 and subordinate's interface 3; Described higher level's interface 2 receives the baseband signal that described ground installation 201 transmits, described baseband signal processes by described central processing module 1, by subordinate's interface 3 by the extremely described radio frequency unit 2022 of the base band signal transmission after process, complete the configuration management of radio frequency unit 2022, and described central processing module 1 receives by described subordinate interface 3 baseband signal that described radio frequency unit 2022 transmits; Wherein, described base station controller 2021 has multiple subordinates interface 3, and described subordinate interface 3 connects described radio frequency unit 2022, the multiple radio frequency unit 2022 of each subordinate interface 3 cascade.
As shown in Figure 5, for of the present invention based on the radio frequency unit block diagram in the underground coal mine distributed base station system of TD-SCDMA.Described radio frequency unit 2022, comprises the first optical module 1`, the second optical module 2`, digital signal processing module 3` and radio-frequency (RF) receiving and transmission module 4`; The radio signal transmission extremely described digital signal processing module 3` that described radio-frequency (RF) receiving and transmission module 4` will receive, described digital signal processing module 3` exports baseband signal by after described radiofrequency signal process, and described baseband signal transfers to described base station controller 2021 through the second optical module 2`; Described first optical module 1` accepts the baseband signal of described base station controller 2021 transmission, described digital signal processing module 3` exports radiofrequency signal to after base band signal process, emission of radio frequency signals is gone out by described radio-frequency (RF) receiving and transmission module 4`, is responsible for the wireless coverage providing TD-SCDMA network.
As shown in Figure 6, for of the present invention based on the radio frequency unit block diagram two in the underground coal mine distributed base station system of TD-SCDMA.On the basis of Fig. 3, described radio frequency unit 2022 also comprises expansion interface 5`; Described expansion interface 5`, comprises personnel positioning interface 51` and state instruction interface 52`, for receiving other application messages, and expansion underground coal mine TD-SCDMA network application function.
Preferably, described higher level's interface 2 and subordinate's interface 3 realize by programmable gate array.
As shown in Figure 7, for the present embodiment based on TD ?SCDMA underground coal mine distributed base station system in base station controller block diagram.Enhancement mode 32 microcontrollers based on ARM core that the main control MCU of base station controller RXU is selected, the main task of this MCU realizes tcp/ip communication by higher level's optical fiber interface and baseband processing unit BBU, complete the bookkeeping of baseband processing unit BBU to base station controller RXU, and by subordinate's optical fiber interface, configuration management is completed to each radio frequency unit DRU; Realize optical fiber interface between baseband processing unit BBU and base station controller RXU, and the Primary Component realizing interface between base station controller RXU and radio frequency unit DRU uses the FPGA of ALTERA company.
In the present embodiment, base station controller RXU devises 8 optical module interfaces, and light mouth 7 adopts speed to be that 2.5Gbps optical fiber connects with BBU and communicates, and is higher level's light mouth, other 7 (light mouth 0 ~ light mouth 6) is all adopt speed to be that 1.25G optical fiber connects with DRU and communicates, and is subordinate Guang Kou; DRU design under each subordinate light mouth supports 6 grades of cascades at most, jointly completes RRU function with RXU.
As shown in Figure 8, for the present embodiment based on the radio frequency unit block diagram in the underground coal mine distributed base station system of TD-SCDMA.In radio frequency unit, logic function mainly comprises the first/the second optical module interface section, digital intermediate frequency part and RF signal receiving and s ending part.Radio frequency unit DRU major function launches radio frequency signal, is responsible for the wireless coverage providing TD-SCDMA network.Completed access and the transmission of radio links function of mobile subscriber by air interface, be connected with base station control interface by optical interface, report measurement information, transmitting system information broadcasting, coordinate RXU to complete the function of whole underground part.
Radio frequency unit DRU is divided into several part, each several part and major function as follows:
Digital signal processing module: use ALTERA company EP4CGX15BF chip and EPM240T chip to coordinate the data transmit-receive achieving optical interface, completing control and management and I/Q data processing, realize digital-to-analogue conversion, is core in DRU system; Realize the function such as Local or Remote configuration, monitoring, test, alarm, upgrading of system.
Power management module: can realize 12V-36V wide region and power, can adapt to the power supply environment of the complexity of underground coal mine; Rated power is less than 6W, can be tested by essential safety.
Radio-frequency (RF) receiving and transmission module: wherein mainly comprise attenuator, frequency mixer, local oscillator, amplifier, filter, dielectric filter; Radio-frequency (RF) receiving and transmission module has two operating frequencies, is respectively 1880-1920MHz and 2010-2025MHz; Two stand-alone antenna configurations, frequency is the integral multiple of 200KHz.Power output stepping 1dB, receiving gain stepping 1dB; Support 1:5,2:4,3:3,4:2,5:1 time slot proportion;
The first/the second optical module: 2.5G optical module, provides the interface of upper and lower cascade;
Personnel positioning interface: 1 RS485 communication interface, can connecting downhole personnel location system.
The radio frequency unit course of work is as follows:
In the downstream direction, the baseband signal be carried on optical fiber that radio frequency unit utilizes the first optical module reception base station controller (RXU) to transmit, base band I/Q signal is up-converted to digital medium-frequency signal at numeric field by digital signal processing module, then by DAC, digital medium-frequency signal is converted to analog if signal, become radiofrequency signal further, finally by two independently radio-frequency (RF) receiving and transmission module signal is amplified to certain power level, gone out by antenna transmission after filtering.
A radio frequency unit is equipped with two radio-frequency modules, and so just can install two the different directions radiation signals of two directional antennas to tunnel, a radio-frequency module coverage of comparing adds one times.
In the upstream direction, the radiofrequency signal that the terminal that antenna receives by radio-frequency (RF) receiving and transmission module is sent carries out filtering and amplification, the radiofrequency signal that radio-frequency (RF) receiving and transmission module sends over by digital signal processing module down-converts to analog if signal, then be digital medium-frequency signal by analog-to-digital conversion, finally at numeric field, digital medium-frequency signal is converted to baseband signal, and sends baseband signal to base station controller by the optical fiber of the second optical module.
Underground coal mine compares with outdoor open-air atmosphere, just can cover a very large plane, but underworkings space is linear arrangement in the high-power base station of outdoor application.One is that in down-hole, use has strict restriction to powerful device, even if two is employ high-power base station, down-hole runs into the environment of turning, and base station coverage has heavy losses.So we redesign into two physical equipments traditional remote radio unit (RRU) RRU in down-hole: base station controller (RXU) and radio frequency unit (DRU).Each radio frequency unit is as a base station coverage 800m tunnel, and every stylobate station control can manage 42 radio frequency units at most simultaneously.This kind of distributed coal mine down-hole TD-SCDMA constructing communication network technology, radio frequency unit (DRU) is by optical fiber and base station controller (RXU) is maximum zooms out distance 3km, and single system can be overall length 33.6km tunnel and provides continuous covering.Not only greatly reduce production cost, be also more applicable to underground coal mine quorum sensing inhibitor and use.This system, at the voice of underground coal mine and transmission of video, can reach raising communication transmission quality, improves labor productivity, improves calamity emergency dispatch control ability, the object reducing casualty loss and prevent and reduce natural disasters.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the underground coal mine distributed base station system based on TD-SCDMA, described underground coal mine distributed base station system comprises ground installation and underground equipment, it is characterized in that, described underground equipment comprises base station controller and radio frequency unit, and described base station controller is connected by optical fiber with radio frequency unit;
Described base station controller, comprises central processing module, higher level's interface and subordinate's interface; The baseband signal that described in described higher level's interface, ground installation transmits, described baseband signal processes by described central processing module, by subordinate's interface by the extremely described radio frequency unit of the base band signal transmission after process, complete the configuration management of radio frequency unit, and the baseband signal that described central processing module is transmitted by radio frequency unit described in described subordinate interface, baseband signal processes by described central processing module, by higher level's interface by process after base band signal transmission to ground installation; Wherein, described base station controller has multiple subordinates interface, and described subordinate interface connects described radio frequency unit, the multiple radio frequency unit of each subordinate's interface cascade;
Described radio frequency unit, comprises the first optical module, the second optical module, digital signal processing module and radio-frequency (RF) receiving and transmission module; The radio signal transmission extremely described digital signal processing module that described radio-frequency (RF) receiving and transmission module will receive, described digital signal processing module exports baseband signal by after described radiofrequency signal process, and described baseband signal transfers to described base station controller through the second optical module; Described first optical module accepts the baseband signal of described base station controller transmission, and described digital signal processing module exports radiofrequency signal to after base band signal process, and emission of radio frequency signals is gone out by described radio-frequency (RF) receiving and transmission module, is responsible for the wireless coverage providing TD-SCDMA network.
2. underground coal mine distributed base station system as claimed in claim 1, it is characterized in that, described radio frequency unit also comprises expansion interface; Described expansion interface, comprises personnel positioning interface and state instruction interface, for receiving other application messages, and expansion underground coal mine TD-SCDMA network application function.
3. underground coal mine distributed base station system as claimed in claim 1, it is characterized in that, described higher level's interface and subordinate's interface realize by programmable gate array.
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| CN201410725487.XA CN104469802A (en) | 2014-12-03 | 2014-12-03 | Underground coal mine distributed base station system based on TD-SCDMA |
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| CN201410725487.XA CN104469802A (en) | 2014-12-03 | 2014-12-03 | Underground coal mine distributed base station system based on TD-SCDMA |
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