CN101741470A - System and method for realizing indoor coverage in GSM network - Google Patents
System and method for realizing indoor coverage in GSM network Download PDFInfo
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- CN101741470A CN101741470A CN200810226894A CN200810226894A CN101741470A CN 101741470 A CN101741470 A CN 101741470A CN 200810226894 A CN200810226894 A CN 200810226894A CN 200810226894 A CN200810226894 A CN 200810226894A CN 101741470 A CN101741470 A CN 101741470A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a system for realizing indoor coverage in a GSM network. The system comprises a main unit and at least one remote unit, wherein the main unit is used for converting one path of GSM radio frequency electrical signal received into an optical signal and dividing the optical signal into a plurality of paths of same optical signals for output, and converting the plurality of paths of optical signals received into electrical signals respectively and combining the electrical signals into one path of electrical signal for output; and the at least one remote unit is used for converting the received optical signal into the electrical signal and filtering the electrical signal to filter out a GSM signal, outputting the GSM signal after power amplification, and filtering the received electrical signal to filter out and amplify the GSM signal and converting the amplified signal into the optical signal for output. The invention also discloses a method for realizing the indoor coverage in the GSM network. The system and the method realize networking of a distribution system, change the mode of performing wireless signal coverage dependent on a single common-frequency power amplification device, provide powerful support and guarantee for indoor coverage construction of a mobile communication network, are energy-saving and environment-friendly, and can reduce repeated construction of a wireless network.
Description
Technical field
The present invention relates to the mobile communication wireless technical field of access networks, particularly in the GSM network, realize the system and method for indoor covering.
Background technology
The high speed development of present mobile communication technology, make the covering of domestic mobile communications network more and more perfect, the user is also in large-scale increase, domestic up to now mobile communication subscriber surpasses 600,000,000, mobile phone is held rate and has been accounted for more than 46%, the huge market value that whole moving communicating field is containing.For supporting operator's development and that depend on for existence is this 600,000,000 cellphone subscriber, can know that by analyzing its behavior the ratio of indoor communications is more and more higher, indoor user has become the chief value place of operator.Therefore,, build the indoor wireless Access Network well, the networking emphasis that to improve indoor distributed network quality be operator in order to attract more indoor user.
The GSM mobile communications network is the digital mobile communication network of a frequency division+time-division, and it is 8 time slots that each carrier wave of gsm system is divided into, and each carrier occupancy 200kHz can realize cellphone subscriber's mobile communication demand, comprises voice communication, low speed data communication etc.The networking initial stage mainly adopts honeycomb to carry out outdoor area and covers, and the outdoor covering of network has at present reached communication requirement substantially.But blocking of indoor because building, the non-constant of signal only depends on outdoor signal can't satisfy the communication requirement of indoor user.So begin to obtain to pay attention at indoor GSM mobile communication wireless access network construction, in all kinds of buildings, as hotel, office building, market, station, airport, residential quarter etc. all in the construction of carrying out internal home network successively.
In GSM mobile communication wireless access network construction, for indoor covering, unique realization technological means is RFPA (radio-frequency (RF) power amplification) technology at present, and its main feature is that the high-power of dependence equipment promotes, and reaches the purpose that wireless signal covers.But the RFPA technology is brought various problems in the processes such as construction, transformation, optimization and upgrading of existing GSM mobile communication wireless access network, such as:
Can only transmit narrow band signal: be subject to power amplifier technology, can not carry out the broadband and amplify, RFPA technology gsm wireless Access Network scheme can only be transmitted narrow band signal;
The introducing noise is big: the introducing of high power active equipment, bring bigger noise to system, lifting the end of information source make an uproar, reduced network quality;
Transmission range is near: radiofrequency signal loss in coaxial feeder is big, is difficult to realize the long Distance Transmission of signal, causes compartment system can't cover large-area place;
Integrated cost is higher: high-power active equipment is many, power consumption is big, take that the machine room resource is big, coaxial transmission feeder line cost height, engineering construction difficulty cause property to coordinate that cost increases, engineering construction cost height greatly;
Electromagnetic pollution is serious, high energy consumption, not environmental protection: the introducing of high power, multi-modulation scheme active equipment, cause space electromagnetic environment complexity, phase mutual interference, pollute big, high power RF multiplying arrangement power consumption itself is just high, causes the mobile phone transmitting power to improve when the Radio Access Network signal quality is bad again, makes power consumption serious.
Summary of the invention
In view of this, the object of the present invention is to provide in the GSM network system and method for realizing indoor covering, be used to solve station access network in the middle of the gsm wireless network planning construction and construct and implement that the bandwidth of existence is little, noise is big, transmission range is short, cost is high and disturb big problem.
For achieving the above object, the invention provides a kind of system that in the GSM network, realizes indoor covering, comprising:
Master unit, the road GSM rf signal that is used for receiving is converted to light signal, and is shunted to identical multipath light signal output; The multipath light signal that receives is converted to the signal of telecommunication respectively, exports after closing the Lu Chengyi road signal of telecommunication;
At least one far-end unit, the light signal that is used for receiving is converted to the signal of telecommunication, and to described signal of telecommunication filtering, leaches the GSM signal, and described GSM signal is carried out exporting after the power amplification; With the signal of telecommunication filtering that receives, leach the GSM signal and amplify, be light signal output with the conversion of signals after amplifying.
The present invention also provides a kind of method that realizes indoor covering in the GSM network, comprising:
The road GSM rf signal that receives is converted to light signal, and is shunted to identical multipath light signal output; The multipath light signal that receives is converted to the signal of telecommunication respectively, exports after closing the Lu Chengyi road signal of telecommunication;
The light signal that receives is converted to the signal of telecommunication, and, leaches the GSM signal, described GSM signal is carried out exporting after the power amplification described signal of telecommunication filtering; With the signal of telecommunication filtering that receives, leach the GSM signal and amplify, be light signal output with the conversion of signals after amplifying.
The present invention adopts the whole network Optical Fiber Transmission, multilayered structure, the output of far-end micropower.System's master unit is modulated to light signal with the GSM micro-power radio frequency signal of information source output and transmits, and makes full use of that fibre loss is little, the characteristics of long transmission distance, carries out long-distance transmissions, covers on a large scale.Only just light signal is converted to the micro-power radio frequency signal in the whole wireless access network, finishes the covering of appointed area at far-end unit.
The input of micropower information source, the output of micro-power radio frequency signal have guaranteed that whole network electromagnetic pollutes reduction greatly, energy consumption is little, and the whole system noise is low, the signal quality height; Information source can be concentrated placement, and the network synthesis cost is low.
In addition, because optical fiber softness, very thin, the enforcement of engineering is more convenient.
Description of drawings
Fig. 1 is the system construction drawing that access, transmission and the signal of realization GSM signal in the embodiments of the invention covers;
Fig. 2 is the structure chart of master unit in the embodiments of the invention;
Fig. 3 is the structure chart of expanding element in the embodiments of the invention;
Fig. 4 is the structure chart of far-end unit in the embodiments of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the system construction drawing that access, transmission and the signal of realization GSM signal in the embodiment of the invention covers, and specifically describes as follows:
Whole system is tree topology, and master unit (Main Unit is called for short MU) provides a plurality of optical branch interfaces downwards, is used to connect expanding element (Expansion Unit is called for short EU) or far-end unit (Remote Unit is called for short RU).For realizing that more far-end units more flexibly insert, system supports multistage expansion, and simultaneously, master unit can directly not hung far-end unit down by expanding element, or by hanging far-end unit under the multistage expanding element, the residence network of different scales can be set up flexibly in system like this.Wherein the structure of the expanding element of heterogeneous networks position, function are identical, are just distinguished level of hierarchy because of the position in the network topology of living in is different.
In the GSM networking, according to target area environment and area size, determine user capacity, determine networking structure, and then the root node master unit in definite network, child node expanding node, the quantity of frontier node distant-end node and the distance of Optical Fiber Transmission, a station access network built into.Determine the carrier number that the information source base station provides according to user capacity.For superhuge overlay area, if information source can not provide enough number of carriers, then need subregion is carried out in the overlay area, in multiplexing mode, increase network capacity, satisfy user's demand.
Figure 2 shows that the structure chart of master unit in the example of the present invention, concrete structure is: on down direction,
Electrical optical converter adopts electrooptic conversion module, is used for the GSM rf signal is converted to light signal.
Optical branching device is used for described light signal demultiplexing light signal output, and every road light signal comprises identical information.
In down link, the GSM rf signal inserts master unit inside by the master unit interface; Master unit is converted to light signal by electrooptic conversion module with the GSM rf signal; Light signal is divided into multipath light signal through optical branching device, and every road light signal comprises identical information, and the light signal after outputs to the expanding element or the far-end unit of next stage by the master unit optical interface along separate routes.
On up direction,
The multichannel photoelectric transformer adopts photoelectric conversion module, and multichannel GSM light signal is converted to the signal of telecommunication respectively.
Signal combiner is used for the multi-channel electric signal after the conversion is closed the road, synthetic one road signal of telecommunication output.
In up link, master unit receives GSM light signal from expanding element or far-end unit by optical interface, and multipath light signal becomes the signal of telecommunication by opto-electronic conversion, and multi-channel electric signal is combined into one the tunnel after by signal combiner, exports by the master unit interface.
Figure 3 shows that the structure chart of expanding element in the example of the present invention, concrete structure is: on down direction,
Photoelectric transformer adopts photoelectric conversion module, and the road GSM light signal that receives is converted to the signal of telecommunication.
Signal compensation circuit is used for the energy and the linear distortion of the signal of telecommunication are compensated.Because signal in transmission course energy loss and distorted signals can take place, signal compensation circuit is exactly in order to carry out corresponding compensation.
Electrical optical converter adopts electrooptic conversion module, is light signal with electrical signal conversion.With the electrical signal conversion after the compensation is light signal, thereby carries out the shunt transmission.
Optical branching device is used for described light signal demultiplexing GSM light signal output, and every road light signal comprises identical information.
In down link, come the GSM light signal of independent unit or upper level expanding element to be linked into expanding element inside through interface, photoelectric conversion module by expanding element is converted to the signal of telecommunication, compensate through signal compensation circuit again, the signal of telecommunication after compensation becomes light signal through opto-electronic conversion, through optical branching device demultiplexing GSM light signal, the interface by expanding element exports next stage expanding element or far-end unit to.
On up direction,
The multichannel photoelectric transformer adopts photoelectric conversion module, and the multichannel GSM light signal that receives is converted to the signal of telecommunication respectively.
Signal combiner is used for the multi-channel electric signal after the conversion is closed the road, synthetic one road signal of telecommunication.
Signal compensation circuit is used for the energy and the linear distortion of the signal of telecommunication are compensated.
Photoelectric transformer adopts electrooptic conversion module, and being used for the electrical signal conversion after the compensation is light signal.
In up link, the multipath light signal that expanding element receives from next stage expanding element or far-end unit, become the signal of telecommunication respectively through opto-electronic conversion, close the road through signal combiner again, after the compensating circuit compensation, be converted to light signal through electrooptic conversion module again, export by the expanding element interface.
Figure 4 shows that the structure chart of far-end unit in the example of the present invention, concrete structure is: on down direction,
Photoelectric transformer adopts electrooptic conversion module, will be converted to the signal of telecommunication from the light signal that expanding element or master unit receive.
The GSM traffic filter is used for the signal of telecommunication is carried out filtering, selects the GSM signal, and the filtering band is outer to be disturbed and noise.
The GSM power amplifier adopts power amplifier module, and the GSM signal is amplified, and makes RU have one to satisfy the suitable down output power that film micro area covers, and to overcome the signal attenuation in the space, satisfies cellphone subscriber's communication requirement.
Down link, light signal enters inner photoelectric conversion module through the interface of far-end unit, becomes the signal of telecommunication through conversion, and the signal of telecommunication filters the outer interference signal of band by the GSM filter; The GSM signal is exported by the interface of far-end unit after the GSM power amplifier amplifies.
On up direction,
The GSM traffic filter is used for the signal of telecommunication that receives is carried out filtering, selects the GSM signal, and the filtering band is outer to be disturbed and noise.
The GSM low noise amplifier adopts the LNA module, and the GSM signal is amplified, and makes RU that a suitable up power output be arranged, so that carry out opto-electronic conversion.
Electrical optical converter adopts electrooptic conversion module, is light signal output with electrical signal conversion.
Up link, the GSM rf signal enters inner GSM filter by the interface of far-end unit, filters the outer interference signal of band, and amplifies through the GSM low noise amplifier, becomes light signal by electrooptic conversion module again, exports by the far-end unit interface.
Above system adopts the whole network Optical Fiber Transmission, multilayered structure, the output of far-end micropower.System's master unit is modulated to light signal with the GSM micro-power radio frequency signal of information source output and transmits, and makes full use of that fibre loss is little, the characteristics of long transmission distance, carries out long-distance transmissions, covers on a large scale.Only just light signal is converted to the micro-power radio frequency signal in the whole wireless access network, finishes the covering of appointed area at far-end unit.
Adopt the input of micropower information source, the output of micro-power radio frequency signal, guaranteed that whole network electromagnetic pollutes reduction greatly, energy consumption is little, the whole system noise is low, the signal quality height; Information source can be concentrated placement, and the network synthesis cost is low.In addition, because optical fiber softness, very thin, engineering construction is more convenient.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1. a system that realizes indoor covering in the GSM network is characterized in that, comprising:
Master unit, the road GSM rf signal that is used for receiving is converted to light signal, and is shunted to identical multipath light signal output; The multipath light signal that receives is converted to the signal of telecommunication respectively, exports after closing the Lu Chengyi road signal of telecommunication;
At least one far-end unit, the light signal that is used for receiving is converted to the signal of telecommunication, and to described signal of telecommunication filtering, leaches the GSM signal, and described GSM signal is carried out exporting after the power amplification; With the signal of telecommunication filtering that receives, leach the GSM signal and amplify, be light signal output with the conversion of signals after amplifying.
2. system according to claim 1 is characterized in that, this system further comprises:
Expanding element, the road light signal that is used for receiving are converted to the signal of telecommunication and carry out signal compensation, are light signal with the conversion of signals after the compensation, and are shunted to the identical light signal output of multichannel; The multipath light signal that receives is converted to the signal of telecommunication respectively, carries out signal compensation behind synthetic one road signal of telecommunication, be converted to light signal output again.
3. system according to claim 1 and 2 is characterized in that, described master unit specifically comprises: on down direction,
Electrical optical converter is used for one road GSM rf signal is converted to light signal;
Optical branching device is used for described light signal demultiplexing light signal output, and every road light signal comprises identical information;
On up direction,
The multichannel photoelectric transformer is used for multichannel GSM light signal is converted to the signal of telecommunication respectively;
Signal combiner is used for the multi-channel electric signal after the described conversion is closed the road, synthetic one road signal of telecommunication output.
4. system according to claim 3 is characterized in that, described far-end unit specifically comprises: on down direction,
Photoelectric transformer, the light signal that is used for receiving is converted to the signal of telecommunication;
The GSM traffic filter is used for the described signal of telecommunication is carried out filtering, leaches the GSM signal, and the filtering band is outer to be disturbed and noise;
The GSM power amplifier is used for described GSM signal is amplified output;
On up direction,
The GSM traffic filter is used for the signal of telecommunication that receives is carried out filtering, leaches the GSM signal, and the filtering band is outer to be disturbed and noise;
The GSM low noise amplifier is used for described GSM signal is amplified;
Electrical optical converter, being used for the GSM conversion of signals after the described amplification is light signal output.
5. system according to claim 2 is characterized in that, described expanding element specifically comprises: on down direction,
Photoelectric transformer, the road light signal that is used for receiving is converted to the signal of telecommunication;
Signal compensation circuit is used for the energy and the linear distortion of the described signal of telecommunication are compensated;
Electrical optical converter, being used for the electrical signal conversion after the described compensation is light signal;
Optical branching device is used for described light signal is divided into identical multipath light signal output;
On up direction,
The multichannel photoelectric transformer, the multipath light signal that is used for receiving is converted to multi-channel electric signal respectively;
Signal combiner is used for described multi-channel electric signal is closed the road, synthetic one road signal of telecommunication;
Signal compensation circuit is used for the energy and the linear distortion of described one road signal of telecommunication are compensated;
Photoelectric transformer, being used for the electrical signal conversion after the described compensation is light signal output.
6. a method that realizes indoor covering in the GSM network is characterized in that, comprising:
The road GSM rf signal that receives is converted to light signal, and is shunted to identical multipath light signal output; The multipath light signal that receives is converted to the signal of telecommunication respectively, exports after closing the Lu Chengyi road signal of telecommunication;
The light signal that receives is converted to the signal of telecommunication, and, leaches the GSM signal, described GSM signal is carried out exporting after the power amplification described signal of telecommunication filtering; With the signal of telecommunication filtering that receives, leach the GSM signal and amplify, be light signal output with the conversion of signals after amplifying.
7. method according to claim 6 is characterized in that, this method further comprises:
The road light signal that receives is converted to the signal of telecommunication and carries out signal compensation, is light signal with the conversion of signals after the compensation, and is shunted to the identical light signal output of multichannel; The multipath light signal that receives is converted to the signal of telecommunication respectively, carries out signal compensation behind synthetic one road signal of telecommunication, be converted to light signal output again.
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| CN200810226894A CN101741470A (en) | 2008-11-19 | 2008-11-19 | System and method for realizing indoor coverage in GSM network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386978A (en) * | 2011-10-24 | 2012-03-21 | 江苏科技大学 | Communication control circuit device based on EPON (Ethernet passive optical network) and working method thereof |
| CN102547778A (en) * | 2012-01-06 | 2012-07-04 | 京信通信系统（中国）有限公司 | Wireless communication system of flat network architecture, method and expansion unit |
| CN110278572A (en) * | 2019-06-24 | 2019-09-24 | 京信通信系统（中国）有限公司 | Data transmission method, main computer unit, expanding element and base station system |
-
2008
- 2008-11-19 CN CN200810226894A patent/CN101741470A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386978A (en) * | 2011-10-24 | 2012-03-21 | 江苏科技大学 | Communication control circuit device based on EPON (Ethernet passive optical network) and working method thereof |
| CN102386978B (en) * | 2011-10-24 | 2014-06-04 | 江苏科技大学 | Communication control circuit device based on EPON (Ethernet passive optical network) and working method thereof |
| CN102547778A (en) * | 2012-01-06 | 2012-07-04 | 京信通信系统（中国）有限公司 | Wireless communication system of flat network architecture, method and expansion unit |
| WO2013102368A1 (en) * | 2012-01-06 | 2013-07-11 | 京信通信系统（中国）有限公司 | Wireless communication system and method and expansion unit of flat network architecture |
| CN102547778B (en) * | 2012-01-06 | 2014-12-10 | 京信通信系统（中国）有限公司 | Wireless communication system of flat network architecture, method and expansion unit |
| US9838885B2 (en) | 2012-01-06 | 2017-12-05 | Comba Telecom Systems (China) Ltd. | Wireless communication system and method and expansion unit of flat network architecture |
| CN110278572A (en) * | 2019-06-24 | 2019-09-24 | 京信通信系统（中国）有限公司 | Data transmission method, main computer unit, expanding element and base station system |
| US10939451B2 (en) | 2019-06-24 | 2021-03-02 | Comba Telecom Technology (Guangzhou) Limited | Data transmission method, host unit, extension unit, and base station system |
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Open date: 20100616 |