CN101931465B - Light transmission bypass device of radio remote system - Google Patents
Light transmission bypass device of radio remote system Download PDFInfo
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- CN101931465B CN101931465B CN200910040470XA CN200910040470A CN101931465B CN 101931465 B CN101931465 B CN 101931465B CN 200910040470X A CN200910040470X A CN 200910040470XA CN 200910040470 A CN200910040470 A CN 200910040470A CN 101931465 B CN101931465 B CN 101931465B
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Abstract
The invention relates to a light transmission bypass device of a radio remote system, which comprises an access control unit, radio remote units of n stages, an optical fiber and n-1 numbered light bypass units, wherein the access control unit and the radio remote unit of the first stage as well as the radio remote units of two adjoining stages are connected by optical fibers. The light transmission bypass device is characterized in that each light bypass unit comprises a switch controller and an optical switch, wherein the input end of the switch controller is connected with the external control interface of the radio remote unit of the same stage, the output end of the switch controller is connected with the control end of the optical switch, the input end of the optical switch is connected with the radio remote unit of the previous stage or the access control unit, and the output end of the optical switch is respectively connected with the radio remote unit of the same stage and the radio remote unit of the next stage. Compared with the prior art, the invention has the advantages of stable and reliable performance, short switching time, less insertion loss and the like.
Description
Technical field
The present invention relates to the radio frequency stretch system of moving communicating field, particularly a kind of light transmission bypass device of radio frequency stretch system.
Background technology
The networking mode of existing digital RF far-drawing system (being RRU) includes but not limited to: star-like, daisy chain, ring-like, mixed networking mode; Wherein adopt the structure of daisy chain networking mode as shown in Figure 1, mainly comprise digital access control unit (being DAU) 101, digital radio frequency far-pulling unit (being DRU) 102, digital fiber 103, repeating transmission and reception antenna 104.Digital RF far-drawing system adopts digital if technology, has overcome the whole shortcoming that descends of signal to noise ratio snr that analog signal long-distance optical fiber attenuation causes, needed dynamic greatly, low noise advantage when having long-distance transmissions; The principle that its realization signal zooms out covering is: directly from base station equipment coupling radiofrequency signal, through behind the digital access control unit 101 radiofrequency signal being converted into digital signal, then by digital fiber 103 transmission, use the daisy chain networking mode that signal is zoomed out remote digital Remote Radio Unit 102, again digital signal is reduced into radiofrequency signal, launch by retransmitting with the big line 104 of reception, thus the expanding mobile communication coverage.
Which kind of networking mode no matter existing digital RF far-drawing system RRU adopt, and the reliability of transmission line is all poor; Particularly road is used under the daisy chain network's mode along the line, if certain one-level Remote Radio Unit DRU breaks down or power down, transmitting light path so also breaks, this certainly will have influence on the normal operation of follow-up Remote Radio Unit DRU, have influence on the operate as normal of whole link when serious, make to cover signal interruption.
In existing analog radio frequency far-drawing system, there is the poor defective of reliability equally.When certain one-level Remote Radio Unit breaks down in the far-drawing system, will have influence on the operate as normal of next stage Remote Radio Unit even whole link, thereby can't finish the covering of zooming out of signal.
Be CN 14025661A, be in the Chinese invention patent application on March 12nd, 2003 in open day at publication number, disclosed a kind of device and transmission method thereof of realizing chain group web E 1 transmission by-pass.This application for a patent for invention is in the chain networking of existing mobile communication system, increased the shunting device of E1 signal, and utilize the method for E1 transmission by-pass, realize when prime equipment breaks down, can this equipment of bypass through the E1 signal of this device transmission, directly pass to subordinate equipment, improved the reliability of chain networking.Though this application for a patent for invention has improved the reliability of communication link to a certain extent, shunting device mainly selects circuit to form the hardware configuration complexity by relay or numeral; In addition, this application for a patent for invention is applicable to carries out bypass to monitor data, and the receiving and transmitting signal that is not suitable for adopting Optical Fiber Transmission carries out bypass.
Summary of the invention
The shortcoming that the objective of the invention is to overcome prior art provides the light transmission bypass device of the radio frequency stretch system that a kind of hardware configuration is simple, Insertion Loss is little with not enough, has strengthened stability and the reliability of radio frequency stretch system transmission line.
Purpose of the present invention is achieved through the following technical solutions: the light transmission bypass device of radio frequency stretch system, comprise the access control unit, n level Remote Radio Unit, optical fiber and n-1 light by-pass unit, between access control unit and the first order Remote Radio Unit, connect by optical fiber between the adjacent two-stage radio-frequency extension unit, it is characterized in that: each light by-pass unit comprises on-off controller and optical switch, wherein the input of on-off controller is connected with the external control interface of Remote Radio Unit at the corresponding levels, the output of on-off controller is connected with the control end of optical switch, the input of optical switch is connected with higher level's Remote Radio Unit or access control unit, the output of optical switch respectively with Remote Radio Unit at the corresponding levels, subordinate's Remote Radio Unit connects.
Described on-off controller is logic control circuit, and this logic control circuit comprises the input that is connected with Remote Radio Unit at the corresponding levels, the output that is connected with optical switch, earth terminal.
Described smooth by-pass unit also comprises modulator-demodulator; Described on-off controller is the monitoring slave, and this monitoring slave comprises as the port RS485_A of input and port RS485_B, as port CTR1 and the port CTR2 of output, and an earth terminal; Its middle port RS485_A is connected with Remote Radio Unit at the corresponding levels with port RS485_B, and port CTR1 is connected with optical switch, and port CTR2 is connected with the modulator-demodulator of light by-pass unit.
Described on-off controller is digital slave, and this numeral slave comprises as the port RS485_A of input and port RS485_B, as the port CTR1 of output, and an earth terminal; Its middle port RS485_A is connected with Remote Radio Unit at the corresponding levels with port RS485_B, and port CTR1 is connected with optical switch.
Bypath principle of the present invention is: when certain one-level Remote Radio Unit operate as normal, the light by-pass unit that is connected with this grade Remote Radio Unit enters into the next stage Remote Radio Unit after making light path successfully enter this grade Remote Radio Unit again.When the situation of power down or abnormal work appearred in certain one-level Remote Radio Unit, the light by-pass unit made light path skip this grade Remote Radio Unit, directly entered into the next stage Remote Radio Unit through optical switch.As seen, when certain the one-level remote termination power down in the radio frequency stretch system or operation irregularity, the present invention is not interrupted system light path and is automatically switched to the next stage remote termination by the control optical switch, has guaranteed the normal operation of whole far-drawing system.
By above technical scheme and bypath principle as can be known, the present invention has following advantage and effect with respect to prior art:
1, the light by-pass unit only by monitoring and simple hardware circuit, is controlled switching by optical switch to light path, has stable performance, reliable, advantage such as switching time is short, Insertion Loss is less; Wherein Insertion Loss is 1dB only, makes the present invention can not cause harmful effect to the long-distance transmissions of far-drawing system.Of the present invention down auxiliary, mobile base station and whole far-drawing system are stablized, operation reliably.
2, of the present invention having wide range of applications: can be applicable to the GSM digital RF far-drawing system, the CDMA digital RF far-drawing system, the base station with the RRU system in; Also can be applied in the analog radio frequency far-drawing system.
Description of drawings
Fig. 1 is the structural representation of the digital RF far-drawing system of existing employing daisy chain networking;
Fig. 2 is the structural representation of digital RF far-drawing system of the present invention;
Fig. 3 is the principle assumption diagram of devices at full hardware light by-pass unit;
Fig. 4 is the circuit structure diagram of logic control circuit among Fig. 3;
Fig. 5 is the principle assumption diagram with light by-pass unit of monitoring slave;
Fig. 6 is the circuit structure diagram of monitoring slave among Fig. 5;
Fig. 7 is the circuit structure diagram of digital slave.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment 1
Fig. 2 is the daisy chain networking structure schematic diagram according to digital RF far-drawing system of the present invention.As shown in Figure 2, the present invention mainly is made up of with reception antenna 204, digital fiber 205 digital access control unit (being DAU) 201, n stages of digital Remote Radio Unit (being DRU) 202, a n-1 light by-pass unit (being called for short OB in the present invention) 203, a n repeating transmission; Each light by-pass unit 203 is connected with subordinate digital radio frequency far-pulling unit with higher level's digital radio frequency far-pulling unit, digital radio frequency far-pulling at the corresponding levels unit respectively.Wherein light by-pass unit OB can adopt the mode of monitoring slave, digital slave, devices at full hardware to realize.Light by-pass unit OB is for adopting the OB of devices at full hardware, structurally as shown in Figure 3 in the present embodiment.Each light by-pass unit OB comprises logic control circuit and optical switch; Wherein the input of optical switch is end points 1, and has three outputs, is respectively end points 2, end points 3 and end points 4, and end points 1 is connected with prime DRU or digital access control unit, and end points 2 is connected with DRU at the corresponding levels with end points 4, and end points 3 is connected with the DRU of subordinate.
As shown in Figure 2, the course of work that the present invention carries out the light transmission is as follows: for down link, the signal of numeral access control unit 201 coupling base station BTS, and the signal that coupling is come is carried out DSP such as filtering, frequency conversion, A/D variations handle, and then carry out after electric light conversion becomes light signal; Optical signals digital fiber 205 is sent to light by-pass unit 203 earlier, and then passes in the digital radio frequency far-pulling unit 202, carry out a series of processing such as opto-electronic conversion, DSP processing, D/A conversion, frequency conversion, radio frequency amplification, filtering after, become radiofrequency signal; Radiofrequency signal sends to the cellphone subscriber finally by crossing to retransmit with reception antenna 204.For up link, retransmit the signal that receives the cellphone subscriber with reception antenna 204; The 202 pairs of signals that receive in digital radio frequency far-pulling unit carry out processing such as filtering, frequency conversion, A/D conversion, DSP; Signal transmits light by-pass unit 203 earlier by digital fiber 205 then, pass to 201 li of digital access control unit again and carry out a series of processing such as opto-electronic conversion, DSP processing, D/A conversion, frequency conversion, radio frequency amplification, filtering, after becoming radiofrequency signal, be coupled to the base station again.
Whether be example, the principle that adopts the OB of devices at full hardware to carry out the light transmission by-pass to the present invention is described as follows: as shown in Figure 3, the end points 2 and 4 of optical switch is normal off if breaking down with first order Remote Radio Unit.In the implementation of devices at full hardware, on-off controller adopts logic control circuit, need not self-powered or battery, and it is a kind of very simple and practical light shunting device.When first order Remote Radio Unit DRU1 does not occur under the situation of power down or operation irregularity, first order Remote Radio Unit DRU1 sends the logic control circuit of high level by OB1 and makes optical switch end points 1 and 2 closures, end points 3 and 4 closures, controlling end points 1 and 3 simultaneously disconnects, light path can enter first order Remote Radio Unit DRU1 normally, makes light path can be transferred to next stage DRU.When the DRU1 power down of first order Remote Radio Unit or work when undesired, first order Remote Radio Unit DRU1 sends the logic control circuit of low level by OB1 and makes optical switch end points 1 and 3 closures, makes light path can be transferred to next stage DRU.So well guaranteed certain grade of DRU power down appears or abnormal situation of working under, the DRU light path of link can not interrupted thereafter, has realized the function of light transmission by-pass preferably.
As shown in Figure 4, the logic control circuit among Fig. 3 comprises the input CTR1 that is connected with DRU at the corresponding levels, the output CTR2 that is connected with optical switch, earth terminal GND.Give low level of input CTR1 during corresponding levels DRU operate as normal, thereby the output CTR2 that makes logic control circuit produces a high level and removes to control optical switch, during corresponding levels DRU fault, produce a high level by input CTR1 and remove to control optical switch, this principle simple possible.
The present embodiment difference from Example 1 is: light by-pass unit OB is for adopting the OB of monitoring slave, structurally as shown in Figure 5.Each light by-pass unit OB comprises modulator-demodulator, monitoring slave and optical switch, and the structure of optical switch is identical with embodiment's 1.
Whether be example, the principle that adopts the OB of monitoring slave to carry out the light transmission by-pass to the present invention is described as follows: as shown in Figure 5, the end points 2 and 4 of optical switch is normal off if breaking down with first order Remote Radio Unit.Adopt the OB of monitoring slave, its on-off controller adopts the monitoring slave, and needing charged source or battery is its power supply.When first order Remote Radio Unit DRU1 does not occur under the situation of power down or operation irregularity, principal and subordinate's monitoring communications mouth between first order Remote Radio Unit DRU1 and first light by-pass unit OB1 will be controlled end points 1 and 2 closures, end points 3 and 4 closures of optical switch, control end points 1 and 3 simultaneously and disconnect, light path can enter first order Remote Radio Unit DRU1 normally.When the DRU1 power down of first order Remote Radio Unit or work when undesired, the monitoring host computer of first order Remote Radio Unit DRU1 sends an information by its external control interface and is given to the monitoring slave, the information that the monitoring slave sends according to the DRU1 external control interface goes to control end points 1 and 3 closures of optical switch, the monitoring slave of OB sends the monitoring host computer that an information is given to DRU1 by its master-slave communication interface simultaneously, make monitoring host computer by its wireless Modem fault be reported network management center, inform that simultaneously the bypass of webmaster light enables.Light path does not enter first order Remote Radio Unit DRU1, but directly zooms out in second level Remote Radio Unit DRU2 and the follow-up Remote Radio Unit.So well guaranteed certain grade of DRU power down appears or abnormal situation of working under, the DRU light path of link can not interrupted thereafter, has realized the function of light transmission by-pass preferably.
As shown in Figure 6, the circuit structure of monitoring slave comprises that 2 are respectively RS485_A and RS485_B as the RS485 port of input among Fig. 5, and 2 output CTR1, CTR2 and an earth terminal GND; Its operation principle is: port RS485_A and port RS485_B be responsible for and DRU at the corresponding levels between communicate, by RS485_A and RS485_B fault message is transferred to the monitoring chip of OB after DRU at the corresponding levels breaks down, the monitoring chip of OB produces control signal at output CTR1 and removes to control optical switch and make it produce bypass functionality then; Simultaneously output CTR2 is transferred to the modulator-demodulator (being Modem) of OB with fault message, and then with fault information reporting.After DRU fault at the corresponding levels solves, by port RS485_A and RS485_B information is transferred to the monitoring chip of OB again, the monitoring chip of OB produces control signal at output CTR1 and removes to control optical switch and make it not produce bypass functionality then; Simultaneously output CTR2 is transferred to the Modem of OB with the discharged information of fault, and then the discharged information of fault is reported, and OB tells to DRU at the corresponding levels by the information that RS485_A and RS485_B have cancelled the light bypass functionality of OB simultaneously.
Embodiment 3
The light by-pass unit OB of present embodiment is for adopting the OB of digital slave, and structurally similar with Fig. 5, difference is that on-off controller adopts digital slave, rather than the monitoring slave; In addition, the light by-pass unit of present embodiment can not have modulator-demodulator.
The circuit structure of numeral slave comprises that 2 are respectively RS485_A and RS485_B as the RS485 port of input as shown in Figure 7, and output CTR, an earth terminal GND; Its operation principle is consistent with the principle of monitoring slave, and difference is to have lacked the function that local Modem reports.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. the light transmission bypass device of radio frequency stretch system, comprise the access control unit, n level Remote Radio Unit, optical fiber and n-1 light by-pass unit, between access control unit and the first order Remote Radio Unit, connect by optical fiber between the adjacent two-stage radio-frequency extension unit, it is characterized in that: each light by-pass unit comprises on-off controller and optical switch, wherein the input of on-off controller is connected with the external control interface of Remote Radio Unit at the corresponding levels, the output of on-off controller is connected with the control end of optical switch, the input of optical switch is connected with higher level's Remote Radio Unit or access control unit, the output of optical switch respectively with Remote Radio Unit at the corresponding levels, subordinate's Remote Radio Unit connects.
2. the light transmission bypass device of radio frequency stretch system according to claim 1, it is characterized in that: described on-off controller is logic control circuit, and this logic control circuit comprises the input that is connected with Remote Radio Unit at the corresponding levels, the output that is connected with optical switch, earth terminal.
3. the light transmission bypass device of radio frequency stretch system according to claim 1, it is characterized in that: described smooth by-pass unit also comprises modulator-demodulator; Described on-off controller is the monitoring slave, and this monitoring slave comprises as the port RS485_A of input and port RS485_B, as port CTR1 and the port CTR2 of output, and an earth terminal; Its middle port RS485_A is connected with Remote Radio Unit at the corresponding levels with port RS485_B, and port CTR1 is connected with optical switch, and port CTR2 is connected with the modulator-demodulator of light by-pass unit.
4. the light transmission bypass device of radio frequency stretch system according to claim 1, it is characterized in that: described on-off controller is digital slave, this numeral slave comprises as the port RS485_A of input and port RS485_B, as the port CTR1 of output, and an earth terminal; Its middle port RS485_A is connected with Remote Radio Unit at the corresponding levels with port RS485_B, and port CTR1 is connected with optical switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910040470XA CN101931465B (en) | 2009-06-23 | 2009-06-23 | Light transmission bypass device of radio remote system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910040470XA CN101931465B (en) | 2009-06-23 | 2009-06-23 | Light transmission bypass device of radio remote system |
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| CN101931465A CN101931465A (en) | 2010-12-29 |
| CN101931465B true CN101931465B (en) | 2013-07-03 |
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| CN200910040470XA Expired - Fee Related CN101931465B (en) | 2009-06-23 | 2009-06-23 | Light transmission bypass device of radio remote system |
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| JP6158818B2 (en) * | 2011-11-07 | 2017-07-05 | ダリ システムズ カンパニー リミテッド | Virtualized wireless network |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060115268A1 (en) * | 2004-11-19 | 2006-06-01 | Zirnheld Mark E | System and method for bypassing a faulty node in an optical network |
| CN1885750A (en) * | 2005-06-23 | 2006-12-27 | 上海华为技术有限公司 | Far-end RF module and its method for transmitting signal |
| CN101369849A (en) * | 2008-10-17 | 2009-02-18 | 北京北方烽火科技有限公司 | Method for switching optical fibre remote radio module cascade nodes |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060115268A1 (en) * | 2004-11-19 | 2006-06-01 | Zirnheld Mark E | System and method for bypassing a faulty node in an optical network |
| CN1885750A (en) * | 2005-06-23 | 2006-12-27 | 上海华为技术有限公司 | Far-end RF module and its method for transmitting signal |
| CN101369849A (en) * | 2008-10-17 | 2009-02-18 | 北京北方烽火科技有限公司 | Method for switching optical fibre remote radio module cascade nodes |
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