CN101388721A - System and method for implementing indoor covering in TD-SCDMA network - Google Patents
System and method for implementing indoor covering in TD-SCDMA network Download PDFInfo
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- CN101388721A CN101388721A CNA200810223782XA CN200810223782A CN101388721A CN 101388721 A CN101388721 A CN 101388721A CN A200810223782X A CNA200810223782X A CN A200810223782XA CN 200810223782 A CN200810223782 A CN 200810223782A CN 101388721 A CN101388721 A CN 101388721A
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Abstract
The invention discloses a method for realizing TD-SCDMA wireless signal extension and coverage and a system thereof, which are realized through adopting a network which is composed of three parts of information source access, optical fiber transmission and distal end coverage. The part of information source access finishes the introduction of information sources, the part of optical fiber transmission finishes the distribution of wireless radiofrequency signals, a wireless signal distributed network is formed by the three parts which are mutually independent and organically combined, and the purpose of target area signal coverage is achieved. The method and the system of the invention realize the network of a distributed system, changes a mode of covering wireless signals through using one single power device, provides forcible support and guarantee for indoor coverage construction of mobile communication network, simultaneously, is energy-saving and environment-friendly, and can reduce repeated construction of wireless networks.
Description
Technical field
The present invention relates to the mobile communication wireless technical field of access networks, particularly in the TD-SCDMA network, realize the system and method for indoor covering.
Background technology
Make from the business of mobile communication to be used for, because the indoor comfortable environment that provides, user's waiting time is also worn down indoor mostly, so the user also more tends in the abundant business of indoor use.At present, indoor traffic carrying capacity surpasses 70%, and along with the increase year by year of data service, and the shared proportion of indoor traffic carrying capacity is with increasing, so mobile communications network must be carried out indoor covering.
The 3G (Third Generation) Moblie standard that TD-SCDMA proposes as China (being called for short 3G), from 1998 formally since ITU (International Telecommunications Union) submits to, gone through the time more than 5 years, finished expert group assessment, ITU approval and issue, the fusion of standard, a series of International standardization work such as introducing of new technology characteristic with 3GPP (third generation partnership projects) system, thus make the TD-SCDMA standard become that first is proposed by China, based on radio communication international standard Intellectual Property Right in China, that accepted extensively in the world and approve.
Aspect the access of data service, because TD-SCDMA (hereinafter to be referred as TD) network has special advantages, and that its most of data service all occurs in is indoor, and therefore at the networking initial stage of TD, indoor covering construction is very important.At present, TD has set up commercial network in ten Olympic Games cities, the whole nation, is planning the TD networking of national provincial capital.Therefore the shared proportion of indoor traffic carrying capacity will be bigger in the city like this, the indoor covering construction emphasis that is the TD networking.
The indoor covering of TD network has two kinds of main solutions at present, and a kind of is BBU (BasebandUnit, Base Band Unit)+RRU (Remote Radio Unit, RF remote unit) mode, and another kind is base station+active dried mode of putting.Wherein, base station+active dried mode of putting is to form by information source (macrocellular, microcellulor, BBU+RRU, repeater etc.)+active device (or passive device)+devices such as feeder line+antenna, traditional RFPA (Radio Frequency Power Amplifier, radio-frequency power amplifies) technical solution that Here it is.Because the power output of TD base station itself is low, need to adopt a large amount of active dried equipment of putting.
But the RFPA technology brings various problems for construction, transformation, optimization and the upgrading etc. of existing network, such as:
Planning problem: the RFPA technology when planning not specially at indoor customization frequency range, need to carry out accurate link budget and capacity configuration before the planning, at the different threshold value of different path settings, therefore the interference level that can cause leaking is wayward, the frequency planning difficulty, be difficult to keep away and return interference, also need repeat complicated link budget when the network capacity extension and transformation, and increase because the blind area cover antenna that dilatation brings; And network just is difficult for change once planning, can not merge and split the sub-district flexibly.
Covering problem: the RFPA technology needs a plurality of high-power power amplifiers to drive carrying out big zone when covering, and satisfying the overlay area demand, but negative effect is to cause the lifting of making an uproar at the bottom of the base station, has a strong impact on communication quality.
Capacity problem: the RFPA technology adopts in the mode covering chamber of a plurality of power amplifiers application, makes the base station integrated noise increase, and has reduced receiving sensitivity, reduced the area that the base station covers, increased uplink load, reduced the absorption to user's telephone traffic to a certain extent, promptly capacity reduces.In the TD network, it is particularly evident that this point seems.
The indoor distribution technique of engineering problem: RFPA, not only to rent expensive machine room separately, also to solve the power issue of each node radio-frequency (RF) power amplification, also need lay thicker, unbending, expensive, that difficulty of construction is big, that the rate that reuses is low feeder line, the result who causes is exactly long construction period, repeats construction, difficulty height, poor operability, and cost of investment strengthens as a result.
In the BBU+RRU mode, BBU is positioned at machine room, is the Base-Band Processing part, and zooming out part (RRU) is Radio frequency Processing Unit, RF Processing Unit, and both form distributed base station jointly.RRU is the major part of a base station equipment in essence, and capacity can't be accomplished to separate to use with covering and consider that RRU can't share the capacity of BBU; Each RRU is exactly a sub-district, will form a plurality of sub-districts like this in large-scale place, causes the difficulty of the network planning, forms a plurality of sub-districts in the place that only needs single subdistrict originally, increases unnecessary switching and network load, transfers the words rate to increase.The RRU back still will connect traditional coaxial compartment system simultaneously, still has the problem that aforesaid RFPA exists.
Summary of the invention
In view of this, the object of the present invention is to provide in the TD-SCDMA network system and method for realizing indoor covering, be used to solve that planning difficulty, the overlay area of TD-SCDMA wireless network planning in the middle of building is little, capacity low and the big problem of engineering difficulty.
For achieving the above object, the invention provides a kind of system that realizes indoor covering in the TD-SCDMA network, this system is a tree structure, comprising:
Master unit is used for the out of band signal filtering with synchronous TD base station signal of time-division, and isolates the downlink electrical signal, is converted to output along separate routes behind the downlink optical signal; Be combined into one the tunnel after the multichannel uplink optical signal that receives is converted to the signal of telecommunication, close filtering out of band signal behind the road, send into the TD base station with downstream signal;
Far-end unit is used for downlink optical signal is converted to the signal of telecommunication, amplifies the back and closes the road with upward signal, exports behind the out of band signal in the filtering downstream signal; Out of band signal in the filtering upward signal, and isolate uplink electrical signals and amplify is exported after being converted to light signal.
The present invention also provides a kind of method that realizes indoor covering in the TD-SCDMA network, comprising:
With the out of band signal filtering in the synchronous TD base station signal of time-division, and isolate the downlink electrical signal, be converted to output along separate routes behind the downlink optical signal; Downlink optical signal is converted to the signal of telecommunication, amplifies the back and close the road, export behind the out of band signal in the filtering downstream signal with upward signal;
Out of band signal in the filtering upward signal, and isolate uplink electrical signals and amplify is exported after being converted to light signal; Be combined into one the tunnel after the multichannel uplink optical signal is converted to the signal of telecommunication, close filtering out of band signal behind the road, send into the TD base station with downstream signal.
System of the present invention need not to carry out complicated power budget when the network capacity extension and transformation because the far-end unit power output is constant, has reduced the planning difficulty; By a plurality of far-end units the overlay area is divided into a plurality of film micro areas, has improved the coverage of system; Because coverage increases, the number of users of carrying increases, and can increase the capacity of system with all users as a sub-district, has improved the utilization ratio of frequency; Equipment in the native system is small and exquisite, need not machine room, and far-end unit need not local power taking, can be long-range with the road power supply, and with respect to the radio frequency feed line small, flexible, price is low as connection cable for employing optical fiber, and it is easier to construct.
The present invention utilizes the transmission carrier wave of light signal as the super wideband wireless radiofrequency signal, with the traffic carrier signal in all radio band scopes, be modulated on the light signal and transmit, thus realize ultra broadband, super low consumption, low cost, multinode, on a large scale, high quality transmission distribution requirement.
Description of drawings
Fig. 1 is a system construction drawing of realizing indoor covering in the embodiments of the invention in the TD-SCDMA network;
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
The system that the embodiment of the invention provides need not to carry out complicated power budget when the network capacity extension and transformation because the far-end unit power output is constant, has reduced the planning difficulty; By a plurality of far-end units the overlay area is divided into a plurality of film micro areas, has improved the coverage of system; Because coverage increases, the number of users of carrying increases, and can increase the capacity of system with all users as a sub-district, has improved the utilization ratio of frequency; Equipment in the native system is small and exquisite, need not machine room, and far-end unit need not local power taking, can be long-range with the road power supply, and with respect to the radio frequency feed line small, flexible, price is low as connection cable for employing optical fiber, and it is easier to construct.。
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 embodiment of the invention realizes indoor covering in the TD-SCDMA network a system construction drawing, and this system specifically describes as follows:
Whole system is tree structure, and master unit (Main Uint, be called for short MU) provides a plurality of minutes support interfaces downwards, can hang down a plurality of expanding elements (Expansion Unit, EU) or far-end unit (RemoteUnit, RU).For realizing that more far-end units more flexibly insert, system supports multistage expansion.The one-level expanding element provides a plurality of minutes support interfaces downwards, can hang a plurality of secondary expanding elements or far-end unit down.Secondary expanding element master unit provides a plurality of minutes support interfaces downwards again, can hang a plurality of three grades of expanding elements or far-end unit down, forms multistage expansion thus.Simultaneously, master unit can be not connect far-end unit by expanding element under directly, or by connecing far-end unit under the multistage expanding element, system can realize large-scale flexible Application like this.Wherein the structure of the expanding element of expanding element heterogeneous networks node location, function are identical, are just distinguished because of the node location in the network topology of living in is different.
As shown in Figure 2, the concrete structure of master unit is: on down direction, comprising:
Filter adopts cavity band-pass filter, is used for the out of band signal of filtering TD base station signal, makes signal pure, filtering interference signals.
Mixer adopts annular device, is used for isolating the downlink radio frequency signal of telecommunication from the up-downgoing time division duplex signal of TD base station.Why uplink and downlink signals is separated into two-way and is for the ease of carrying out signal processing respectively, the amplification power demand of two paths of signals is different.
Electrical optical converter adopts the simulated light transmitter module, and being used for the downlink radio frequency electrical signal conversion after separating is light signal.Light emission module utilizes the electrical signal conversion of front to export for light signal.
Optical branching device is used for the light signal after the conversion is carried out shunt more than 1 minute, formation multichannel downlink optical signal branch, thereby but a plurality of expanding elements of the second line of a couplet or far-end unit.
On up direction, comprise
The multichannel photoelectric transformer, a plurality of simulated light receiver modules are used for and will be transformed into multi-channel electric signal from a plurality of expanding elements or the next uplink optical signal of far-end unit.
Signal combiner adopts general wave multiplexer spare, is used for described multi-channel electric signal directly superposeed closing the road, forms one tunnel signal of telecommunication that mixes.
Mixer adopts annular device that upward signal and downstream signal are closed the road.To close the road and be in order to dock with the output interface (Tx/Rx) of TD base station, this interface comprises the signal that the road is closed in up-downgoing.Described uplink and downlink signals all is meant the radiofrequency signal of TD.
Filter adopts cavity band-pass filter, is used for sending into the TD base station behind the out of band signal of filtering TD upward signal, makes signal pure, filtering interference signals.
The major function of master unit is to finish the access of source signal, and the radiofrequency signal of information source is sent to next stage expanding element or far-end unit by after the electric light conversion.
As shown in Figure 3, be the structure chart of expanding element in the embodiment of the invention, concrete structure is: on down direction, comprise
Photoelectric transformer is used for the light signal of input is carried out light/electric conversion, converts the signal of telecommunication to.
Electric amplifier is used for the signal of telecommunication after the conversion is amplified output.Because the electrical signal intensity after the conversion a little less than, can't directly carry out electric light conversion along separate routes, so need amplify earlier.
Electrical optical converter is used for the described signal of telecommunication is carried out the electric light conversion, is converted to light signal.
Optical branching device is used for one road light signal is shunted to multipath light signal output.
On up direction, comprising:
The multichannel photoelectric transformer, the uplink optical signal that is used for coming from a plurality of far-end unit transmission is transformed into multi-channel electric signal through light/electricity respectively.
Signal combiner is used for described multi-channel electric signal is closed the road, forms one tunnel signal of telecommunication that mixes.
Electric amplifier is used for described one road signal of telecommunication is amplified output.Because close behind the road electrical signal intensity a little less than, can not directly carry out electric light conversion, it need be amplified.
Electrical optical converter is used for the described signal of telecommunication is carried out the electric light conversion, is converted to light signal output.
The major function of expanding element is the signal that receives upper level equipment, and relaying is given next stage equipment after amplifying the back demultiplexing.
Fig. 4 is the structure chart of far-end unit in the embodiment of the invention, and its concrete structure is: on down direction, comprise
Photoelectric transformer is used for and will be transformed into the signal of telecommunication through light/electricity from expanding element or the next downlink optical signal of master unit.
Electric amplifier is used for the downlink electrical signal is amplified back output.Because the electrical signal amplitude of exporting after the opto-electronic conversion is too small, so need amplify.
Switch switch, the employing time is switched switch, exports after the TD downstream signal of time division duplex and upward signal are closed the road.Because the far-end unit back need connect antenna, and antenna transmit-receive sharing normally, so need to carry out the road of closing of uplink and downlink signals here.Described to switch function and the mixer in the master unit that switch finishes similar, but switch the up-downgoing isolation height of switch, can avoid downstream signal to play a reversed role into disturbing up normal reception in up.
Filter adopts the out of band signal in the cavity band-pass filter filtering downstream signal, makes signal pure, filtering interference signals.
On up direction, comprising:
Filter adopts the out of band signal in the cavity band-pass filter filtering upward signal, makes signal pure, filtering interference signals.
Switch switch, the employing time is switched switch, is used for isolating upward signal from the TD uplink and downlink signals.
Electric amplifier is used for uplink electrical signals is amplified back output.Because the electrical signal amplitude of up input is too small, so need amplify.
Electrical optical converter, being used for electrical signal conversion is light signal.
The major function of far-end unit is that light signal is reduced to radiofrequency signal, amplifies back output again.
At indoor customization frequency, the far-end unit power output can be controlled by software, is easy to control and leaks, and reduces and disturbs; And, need not to carry out complicated power budget when the network capacity extension and transformation because the far-end unit power output is constant.And the discharge technique of making an uproar of the preposition end of far-end unit has improved upstream noise, has promoted the quality of reception of system.
Utilize above system, can improve upstream noise, reduce the influence that traffic is absorbed.A plurality of frequencies can be combined in the sub-district and use, use in a plurality of sub-districts respectively than same a plurality of frequencies and can improve capacity.
In addition, the equipment in the native system is small and exquisite, need not machine room; Far-end unit need not local power taking, can long-rangely power with the road.With respect to the radio frequency feed line small, flexible, price is low as connection cable for employing optical fiber, and construction easily.
Fig. 1 signal processing is as follows: downstream signal becomes light signal at information source side input master unit by the electric light conversion, sends into expanding element by optical fiber then; Expanding element amplifies the back to signal compensation and sends into next stage expanding element or far-end unit by optical fiber; Far-end unit becomes the signal of telecommunication to light signal again, amplifies back output at last.It is big to carry out LNA behind the upward signal input far-end unit, becomes light signal by the electric light conversion, sends into expanding element by optical fiber then; Expanding element amplifies the back to signal compensation and sends into upper level expanding element or master unit by optical fiber; Master unit is exported after again light signal being become the signal of telecommunication.
The present invention adopts fiber medium to transmit, and has ultra broadband, super low consumption, dielectric property cheaply, and the transmission of finishing from the information source convergence point to each signal access point distributes.When solving the distribution of wireless signal, the frequency resource that the repetition resource characteristics that has utilized wireless signal to be had in the short space scope is brought is reused advantage, and the low-cost characteristic of signal processing, the overlay area is divided into a plurality of film micro areas, solve the distribution problem of signal.The low-cost characteristic here is that the signal processing cost is low because far-end unit adopts the micropower power amplifier module, and optical fiber replaces coaxial cable, and the cost of optical fiber is lower than coaxial cable; By multilevel hierarchy of the present invention, terminal RU quantity is many, and each RU can be divided into a film micro area.The present invention utilizes the transmission of Optical Fiber Transmission and radio frequency cable to compare itself just to possess high bandwidth and low-loss characteristic, the transmission carrier wave of light signal as the super wideband wireless radiofrequency signal, with the traffic carrier signal in all radio band scopes, be modulated on the light signal and transmit, thus realize ultra broadband, super low consumption, low cost, multinode, on a large scale, high quality transmission distribution requirement.
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 (9)
1, a kind of system that realizes indoor covering in the TD-SCDMA network is characterized in that this system is a tree structure, comprising:
Master unit is used for the out of band signal filtering with synchronous TD base station signal of time-division, and isolates the downlink electrical signal, is converted to output along separate routes behind the downlink optical signal; Be combined into one the tunnel after the multichannel uplink optical signal that receives is converted to the signal of telecommunication, close filtering out of band signal behind the road, send into the TD base station with downstream signal;
Far-end unit is used for downlink optical signal is converted to the signal of telecommunication, amplifies the back and closes the road with upward signal, exports behind the out of band signal in the filtering downstream signal; Out of band signal in the filtering upward signal, and isolate uplink electrical signals and amplify is exported after being converted to light signal.
2, system according to claim 1 is characterized in that, this system further comprises:
Expanding element, the downlink optical signal that is used for receiving amplifies after being converted to the signal of telecommunication, is converted to light signal again and exports along separate routes; The multichannel uplink optical signal that receives is converted to the signal of telecommunication respectively and closes the road, be converted to light signal output after the amplification again.
3, system according to claim 2 is characterized in that, described master unit specifically comprises: on down direction,
Filter is used for the out of band signal of filtering TD base station signal;
Mixer is used for isolating the downlink radio frequency signal of telecommunication from the TD base station signal;
Electrical optical converter, being used for the downlink radio frequency electrical signal conversion after separating is light signal;
Optical branching device is used for described light signal is carried out shunt the demultiplexing downlink optical signal;
On up direction,
The multichannel photoelectric transformer, the multichannel uplink optical signal that is used for receiving from a plurality of expanding elements or far-end unit is transformed into the signal of telecommunication respectively;
Signal combiner is used for multi-channel electric signal is closed the Lu Chengyi road signal of telecommunication;
Filter is used for sending to the TD base station behind the out of band signal of described one road signal of telecommunication of filtering.
4, according to claim 2 or 3 described systems, it is characterized in that described master unit further comprises: on up direction,
Mixer is used for described upward signal and the downstream signal that closes the road signal of telecommunication behind the road closed the road.
5, according to claim 2 or 3 described systems, it is characterized in that described expanding element specifically comprises: on down direction,
Photoelectric transformer, the converting optical signals that is used for receiving becomes the signal of telecommunication;
Electric amplifier is used for the described signal of telecommunication is amplified output;
Electrical optical converter, being used for the electrical signal conversion after the described amplification is light signal;
Optical branching device is used for described light signal is shunted to multipath light signal output;
On up direction, comprising:
The multichannel photoelectric transformer, the light signal that is used for receiving from a plurality of far-end units is transformed into the signal of telecommunication respectively.
Signal combiner is used for multi-channel electric signal is closed the Lu Chengyi road signal of telecommunication;
Electric amplifier is used for described one road signal of telecommunication is amplified output;
Electrical optical converter, being used for the electrical signal conversion after the described amplification is light signal output.
6, according to claim 2 or 3 described systems, it is characterized in that described far-end unit specifically comprises: on down direction,
Photoelectric transformer, the converting optical signals that is used for receiving from expanding element or master unit becomes the signal of telecommunication;
Electric amplifier is used for the described signal of telecommunication is amplified back output;
Filter is used for the out of band signal of the signal of telecommunication after the described amplification of filtering;
On up direction, comprising:
Filter is used for the out of band signal of filtering electric signal;
Electric amplifier is used for the described signal of telecommunication is amplified back output;
Electrical optical converter, being used for the electrical signal conversion after the described amplification is light signal output.
7, according to claim 2 or 3 described systems, it is characterized in that this system further comprises:
Switch switch, on down direction, export after being used for the TD downstream signal of the signal of telecommunication after amplifying and upward signal closed the road; On up direction, be used for the described filtered signal of telecommunication is carried out Signal Separation, from TD upward signal and downstream signal, isolate upward signal.
8, a kind of method that realizes indoor covering in the TD-SCDMA network is characterized in that, comprising:
With the out of band signal filtering in the synchronous TD base station signal of time-division, and isolate the downlink electrical signal, be converted to output along separate routes behind the downlink optical signal; Downlink optical signal is converted to the signal of telecommunication, amplifies the back and close the road, export behind the out of band signal in the filtering downstream signal with upward signal;
Out of band signal in the filtering upward signal, and isolate uplink electrical signals and amplify is exported after being converted to light signal; Be combined into one the tunnel after the multichannel uplink optical signal is converted to the signal of telecommunication, close filtering out of band signal behind the road, send into the TD base station with downstream signal.
9, method according to claim 8 is characterized in that, this method further comprises:
Amplify after downlink optical signal is converted to the signal of telecommunication, be converted to light signal again and export along separate routes; The multichannel uplink optical signal is converted to the signal of telecommunication respectively and closes the road, be converted to light signal output after the amplification again.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810223782XA CN101388721A (en) | 2008-10-13 | 2008-10-13 | System and method for implementing indoor covering in TD-SCDMA network |
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| CNA200810223782XA CN101388721A (en) | 2008-10-13 | 2008-10-13 | System and method for implementing indoor covering in TD-SCDMA network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651873A (en) * | 2011-02-23 | 2012-08-29 | 中国移动通信集团公司 | Signal transmission method, system and equipment for indoor distribution system |
| US8750171B2 (en) | 2011-12-02 | 2014-06-10 | Huawei Technologies Co., Ltd. | Femtocell/WLAN communication device |
| CN104617995A (en) * | 2014-12-29 | 2015-05-13 | 三维通信股份有限公司 | Method for resisting interference of small cell uplink signal to indoor DAS (Data Acquisition Station) system based on antenna selection |
-
2008
- 2008-10-13 CN CNA200810223782XA patent/CN101388721A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651873A (en) * | 2011-02-23 | 2012-08-29 | 中国移动通信集团公司 | Signal transmission method, system and equipment for indoor distribution system |
| CN102651873B (en) * | 2011-02-23 | 2014-12-10 | 中国移动通信集团公司 | Signal transmission method, system and equipment for indoor distribution system |
| US8750171B2 (en) | 2011-12-02 | 2014-06-10 | Huawei Technologies Co., Ltd. | Femtocell/WLAN communication device |
| CN104617995A (en) * | 2014-12-29 | 2015-05-13 | 三维通信股份有限公司 | Method for resisting interference of small cell uplink signal to indoor DAS (Data Acquisition Station) system based on antenna selection |
| CN104617995B (en) * | 2014-12-29 | 2018-04-03 | 三维通信股份有限公司 | A kind of indoor DAS system based on day line options resists small uplink signal of base station interference method |
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