CN101035323A - Micro-wave extension method and device of the time division duplex mobile communication system - Google Patents
Micro-wave extension method and device of the time division duplex mobile communication system Download PDFInfo
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- CN101035323A CN101035323A CNA2006100226982A CN200610022698A CN101035323A CN 101035323 A CN101035323 A CN 101035323A CN A2006100226982 A CNA2006100226982 A CN A2006100226982A CN 200610022698 A CN200610022698 A CN 200610022698A CN 101035323 A CN101035323 A CN 101035323A
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Abstract
The invention discloses a methode and device of microwave zooming out with time division duplex in the mobile communication system. It has solved the problem of radio frequency zoom out with cable or optical fiber connection bwteen base station and antenna in TD-SCDMA system. The microwave transmission equipment is composed of cable and wireless base stations connected by group of separation remote microwave machine and microwave cables using the antenna amplifier. Microwave antenna amplifier synchronization is controlled by wireless base station through the cable control. Remote microwave machine and antenna amplifier synchronization and controlling is abtained by wireless control unit through the medium of space communication. Using three electric control decliners, outself-adapting control can be achieved. The invention solves the problem of TD-SCDMA super base station radio frequency zooming out.
Description
Technical field
The present invention relates to the microwave transmission method and apparatus that 3G (the 3rd third-generation mobile communication) base station equipment realizes that radio frequency zooms out.Especially relating to a kind of microwave method and device that propose to use at time division duplex mobile communication system (as the TD-SCDMA system), is to solve in the TD-SCDMA system can't connect the problem that realizes that radio frequency zoom out with cable or optical fiber fully between the base station and antenna.
Background technology
In second generation mobile communication system, in GSM and IS-95CDMA system, adopted the digital microwave extension apparatus to transmit signal between above-mentioned two equipment in a large number in order to solve the difficulty that temporarily can't set up transmission line between wireless base station and the base station controller.At present in each big city of China, employing works in the PDH of 13/15GHz frequency range or the micro-wave extension of SDH mode work is installed in the mobile radio communication in a large number.As shown in Figure 1, among the figure, 100 is base station controller, is to use a cover digital micro-wave extension device 111 and 112 to transmit the digital signal of Ab interface between it and the wireless base station 120.This microwave equipment uses a pair of carrier frequency f1 and f2, realizes transmitted in both directions with the Frequency Division Duplexing (FDD) mode.Because this microwave frequency band frequency ratio is lower, antenna size can not be very big, and radiation beam is than broad, and the number of microwave systems that can use simultaneously at the same area is restricted.
At present, in 3G (Third Generation) Moblie TD-SCDMA network, to in an area or a building, realize covering, must set up a base station (so-called macro base station or microcomputer station), solve the method that connects between base station and the base station controller in usefulness and the above-mentioned second generation mobile communication system again, use wire transmission circuit or micro-wave extension device to connect Iub interface.Because the 3G system in order to satisfy indoor covering, just need provide the signal source (using so-called little base station usually) of indoor covering in a large number, causes system cost, comprises the increase of equipment cost and engineering cost.Along with the NodeB Progress in technique, many companies all release jumbo what is called " super base station ", and its super base station of typical TD-SCDMA capacity reaches 72 (even more) contained fans.But,,, also only can use 18 contained fans even adopt the design of 3 sectors, 6 carrier waves in this base station.Certainly, can use base-band digital fiber optic stretch technology in theory, pull out several sectors again, but owing to must use special optic fibre, in fact some engineering can't set up.Like this, the big capacity of super base station can't play one's part to the full, and just may deal with problems and have only wireless radio frequency to zoom out mode.
But, have only the micro-wave extension device of Frequency Division Duplexing (FDD) in the market, it is used for but unusual difficulty of occasion that radio frequency zooms out, at first to solve high linear requirement, also to increase the conversion back and forth of frequency division/time-division, but also will waste one times frequency resource.
The major defect of above-mentioned prior art is that present digital microwave extension apparatus all adopts the Frequency Division Duplexing (FDD) mode to design, and should not be used in the TD-SCDMA system.Its reason is as follows:
1. existing digital microwave extension apparatus all is Frequency Division Duplexing (FDD) (FDD) system design, and TD-SCDMA is time division duplex (TDD) system of multi-slot.Specifically, in FDD micro-wave extension device, the radio frequency receiver of microwave machine and sender will use different carrier to work continuously; And in the TD-SCDMA system, what reception and emission were used is same carrier frequencies, but regularly works respectively by system, and this regularly may change according to system requirements in system works.
2. having the method for using the micro-wave extension device in second generation mobile radio communication now all is that the transmission base station is to the signal between the base station controller, and the message transmission rate that needs very low (general 1 E1) to several 2Mbps, the signal strength signal intensity relative fixed, dynamic range is also smaller, so simple PDH micro-wave extension device just can meet the demands.And the radio frequency that is used in the TD-SCDMA system is when zooming out, and needed message transmission rate may be high tens times, and dynamic range of signals may require 60-70dB, and traditional PDH and SDH microwave equipment all are difficult to meet the demands.
3. existing digital microwave extension apparatus all is the work of Frequency Division Duplexing (FDD) mode, is not suitable for transmitting the signal of time division duplex mobile communication system.
4. when widely-used micro-wave extension device realizes that radio frequency zooms out in the city, certainly exist radio frequency interference in each microwave system, use than low-frequency range and will limit the quantity that the micro-wave extension device uses.
Summary of the invention
One of purpose of the present invention provides a kind of micro-wave extension device that is fit to be used in the TD-SCDMA system.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of time division duplex mobile communication system micro-wave extension device, described micro-wave extension device by the near-end microwave machine that is connected with cable group with the wireless base station, distal portion from the remote microwave machine form with the antenna amplifier antennafire that cable group is connected with the remote microwave machine; Controlling by cable by the wireless base station with control synchronously of near-end microwave machine, the synchronous and control of remote microwave machine and antenna amplifier antennafire is realized by space communication by wireless energy control units; In the micro-wave extension device, use 3 automatically controlled adjustable attenuators to realize adaptive gain control at least.
The cable group that described wireless base station is connected with the near-end microwave machine comprises the cable of a transmission intermediate frequency signal; Article one, transmit the control line that control near-end microwave machine receives or launches, the near-end microwave machine is synchronous with the transmitting-receiving of wireless base station by this control line realization; One group of data wire and clock line of the near-end microwave machine being carried out monitoring; , a service cable; , an earth connection.
The cable group that described wireless base station is connected with the near-end microwave machine also comprises a reference clock line.
The cable group that described remote microwave machine is connected with antenna amplifier antennafire comprises the cable of a transmitting radio frequency signal; Article one, transmission control antenna amplifier receives or the control line of emission; One group of data wire and clock line of antenna amplifier antennafire being carried out monitoring; , a service cable; And earth connection.
2G Transmit-Receive Unit and cable group interface end in the described near-end microwave machine are provided with the loss of at least one automatically controlled adjustable mean frequency attenuator with the compensating cable group, the attenuation of this attenuator is controlled according to the down transmitting power level that the output port in the microwave transmitting and receiving unit records by near-end microwave machine inner control unit, guarantees that this transmitted power level is a fixed value.
Be provided with at least one automatically controlled adjustable mean frequency attenuator in the described near-end microwave machine in the up receiving lines with the space attenuation between the compensation microwave antenna, the attenuation of this attenuator is controlled according to the up received power level that records before the attenuator at 2G Transmit-Receive Unit and cable group interface end place by near-end microwave machine inner control unit, guarantees that this maximal received power level is no more than a fixed value.
Be provided with at least one automatically controlled adjustable attenuator in the microwave transmitting and receiving equipment unit of described remote microwave machine with the loss of compensating cable group and the space attenuation between the microwave antenna, the attenuation of this attenuator is controlled according near the down transmitting power level that records output interface by antenna amplifier antennafire or remote microwave machine inner control unit, guarantees that this transmitted power level is a fixed value.
Near-end microwave machine in the described micro-wave extension device is the time division duplex heterodyne system transceiver of double conversion, realize adaptive gain control with two automatically controlled adjustable attenuators, reception and emission work in same carrier frequencies, receive and dispatch timing controlled by the wireless base station, realize time division duplex; The remote microwave machine is the time division duplex heterodyne system transceiver of single-conversion, realizes adaptive gain control with an automatically controlled adjustable attenuator; Antenna amplifier antennafire is a pair of power amplifier and low noise amplifier, works in the mobile communication carrier frequency; Described remote microwave machine works in same carrier frequencies with the reception and the emission of the remote equipment of antenna amplifier antennafire that is connected with cable group and antenna formation, transmitting-receiving is regularly by placing the wireless energy control units in above-mentioned antenna amplifier antennafire or the remote microwave machine to produce and control, realize time division duplex, and the assurance remote equipment can be worked under the unified monitoring of mobile communication system webmaster.
Two of purpose of the present invention provides a kind of microwave transmission method that adapts to TDD digital micro-wave extension device.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of microwave transmission method of using TDD digital micro-wave extension device, the near-end microwave machine, remote microwave machine and antenna amplifier antennafire constantly will be in the base station state simultaneously at a descending time slot, constantly then be in the base station accepting state simultaneously at another ascending time slot, at descending time slot, armed high-speed digital signal from above-mentioned wireless base station, use QPSK, 16QAM or other modes are carried out digital modulation and are changed intermediate-freuqncy signal into and deliver to transmitter in the near-end microwave machine by the immediate frequency cable in the described cable group through numeral to analogue converter again, frequency conversion is amplified the back and is emitted to the remote microwave machine by microwave antenna, amplifying frequency conversion in this remote microwave machine is the frequency of mobile communication work, deliver to described antenna amplifier antennafire by described cable group again, in described antenna amplifier antennafire, be amplified to required launching electrical level, launch by antennal interface; At ascending time slot, amplify through described antenna amplifier antennafire by the small-signal that described antennal interface receives, deliver to described remote microwave machine by described cable group, in this remote microwave machine, amplify and be converted to microwave frequency, reach described near-end microwave machine by described microwave antenna, in this near-end microwave machine, amplify and downconvert to the intermediate-freuqncy signal of modulation, deliver to the receiving terminal of wireless base station again by above-mentioned cable group.
The radio-frequency (RF) transceiver of the wireless energy control units in described antenna amplifier antennafire or the remote microwave machine and the coupling of the 2GHz radiofrequency signal of transmission, when this antenna amplifier antennafire power supply opening, to be in accepting state, above-mentioned wireless energy control units is searched for residing sub-district immediately, to obtain initial synchronisation and to sign in in the network, obtain the working status parameter of this microwave system then from network management center, after above-mentioned acquisition synchronously, time difference dT between the initial moment of DwPTS that measures and UpPTS, according to the frame structure of TD-SCDMA standard, can calculate the time delay of this micro-wave extension system:
T=(150-dT)/2 (microsecond) (1)
And downlink enables zero-time Tx
Tx=To+275+nx675-2xT-6 (microsecond) (2)
Enable zero-time Rx with up reception
Rx=To+80 (microsecond) (3)
Above various in, dT is the measured time difference;
To is the measured initial moment of DwPTS;
Tx enables zero-time for the remote equipment downlink;
Rx is that the up reception of remote equipment enables zero-time;
N is the ascending time slot number;
Like this, the remote equipment of this micro-wave extension is normally pressed the work of system requirements time division duplex, in the course of the work, also will be by the requirement of webmaster, the operating state of equipment and ambient conditions are measured and reported, when the uplink and downlink timeslot ratio of system changed, the downlink of this microwave equipment enabled zero-time and also uses above-mentioned formula
(2) result calculated changes.
The present invention proposes tdd systems in a kind of 3-G (Generation Three mobile communication system) (as TD-SCDMA) and use the method for designing that TDD digital micro-wave extension device realizes that radio frequency zooms out and the square law device of system works, this micro-wave extension device by the near-end microwave machine that is connected with cable group with the wireless base station and distal portion from the remote microwave machine form with the antenna amplifier antennafire that is connected with cable group with it, the near-end microwave machine synchronously and control control by cable by the wireless base station; Being realized by space communication by wireless energy control units with control synchronously of remote microwave machine and antenna amplifier antennafire uses 3 automatically controlled adjustable attenuators to realize adaptive gains control.
Description of drawings
Fig. 1. existing micro-wave extension device using method schematic diagram in mobile communication;
Fig. 2 system equipment block diagram of the present invention;
Fig. 3 cable group constitutes schematic diagram;
Fig. 4 is in the method for fiber optic stretch far end box switching IF interface;
Fig. 5 near-end microwave machine design frame chart;
Fig. 6 remote microwave machine design frame chart;
The design frame chart of the automatically controlled adjustable mean frequency attenuator of Fig. 7 near-end microwave machine;
The design frame chart of the adjustable 2G attenuator 3221 of the dynamo-electric control of Fig. 8 remote microwave.
Embodiment
Use TDD digital micro-wave extension device to realize that the design method that radio frequency zooms out is: a kind of time division duplex mobile communication system micro-wave extension device, with reference to the accompanying drawings 2, wireless base station 200 is connected to near-end microwave machine 220 by cable group 210, at far-end, there is remote microwave machine 240 to be connected by another cable group 250 with antenna amplifier antennafire 260.Intercom mutually by a pair of microwave antenna 230 between near-end microwave machine 220 and the remote microwave machine 240.The antennal interface 270 of antenna amplifier antennafire 260 can connect the mobile communication antenna that covers a sub-district, sets up a sub-district; Also can connect a cover indoor covering system, as the signal source of this indoor covering system.System design of the present invention is to all adopting cable group 210 to be connected with 250 respectively between wireless base station 200 and the near-end microwave machine 220 and between remote microwave machine 240 and the antenna amplifier antennafire 260, make above-mentioned each equipment, comprise wireless base station 200, near-end microwave 220, remote microwave machine 240, can be installed in different positions according to requirement of engineering with antenna amplifier antennafire 260,, can use and various occasions for actual engineering provides high flexibility.
Because during practical engineering application, the length of cable group 210 and cable group 250 is set according to requirement of engineering, the distance of microwave antenna also is that requirement of engineering is determined, so the loss of above-mentioned cable group and the space attenuation between the microwave antenna all are unknown; On the other hand, the dynamic range of received signal itself is just very big in the TDD mobile communication system, and the dynamic range of microwave machine is always limited.For solving above-mentioned contradiction, one aspect of the present invention is exactly the adaptive method that the loss and the space attenuation between the microwave antenna 230 of cable group 210 and 250 are compensated how: 1). in near-end microwave machine 220 and cable group 210 interface end automatically controlled adjustable mean frequency attenuators 5131 of design (attenuator 1) with the loss of compensating cable group 210, the attenuation of this attenuator be subjected to near-end microwave machine 220 inner control unit according to microwave antenna 230 interfaces near the down transmitting power level that records control, guarantee that this transmitted power level is a fixed value (see figure 7); 2). in near-end microwave machine 220, design an automatically controlled adjustable mean frequency attenuator 5132 (attenuator 2) in the up receiving lines with the space attenuation between the compensation microwave antenna 230, the attenuation of this attenuator is controlled according to the up received power level that records before above-mentioned attenuator 1 by near-end microwave machine 220 inner control unit, guarantees that this maximal received power level is no more than a fixed value (see figure 7); 3). an automatically controlled adjustable attenuator 3221 of design (attenuator 3) is with the loss of compensating cable group 250 and the space attenuation between the microwave antenna 230 in the microwave transmitting and receiving equipment unit 322 of remote microwave machine 240, the attenuation of this attenuator be subjected to antenna amplifier antennafire 260 inner control unit according to output interface 270 near the down transmitting power level that records control, guarantee that this transmitted power level is a fixed value (see figure 8).
A significant design method among the present invention is the design of two groups of cable group (among Fig. 2 210 and 250) as shown in Figure 3.Fig. 3 A shows the formation of the cable group that connects between wireless base station (among Fig. 2 200, among Fig. 3 200) and the near-end microwave machine (among Fig. 2 220, among Fig. 3 220) (among Fig. 2 210).As shown in Figure 3: the cable group 210 that connects wireless base station 200 and near-end microwave machine 220 comprises the cable 301 of a transmission intermediate frequency signal; Article one, transmit the control line 302 that control near-end microwave machine 220 receives or launches, the near-end microwave machine is synchronous with the transmitting-receiving of base station by this control line realization; One group of data wire 303 and clock line 304 of near-end microwave machine 220 being carried out monitoring; Article one, service cable 305; Article one, earth connection 306; And the reference clock line 307 that may need.Fig. 3 B shows the formation of the cable group that connects between remote microwave machine (among Fig. 2 240, among Fig. 3 240) and the antenna amplifier antennafire (among Fig. 2 260, among Fig. 3 260) (among Fig. 2 250).The cable group 250 of its connection remote microwave machine 240 and antenna amplifier antennafire 260 comprises the cable 311 of a transmitting radio frequency signal, article one, transmission control antenna amplifier 260 receives or the control line 312 of emission, one group of data wire 313 and clock line 314 of antenna amplifier antennafire 260 being carried out monitoring, article one, service cable 315, and an earth connection 316.Each equipment in the system, comprise that the wireless base station is (among Fig. 2 200, among Fig. 3 200), the near-end microwave machine is (among Fig. 2 220, among Fig. 3 220), remote microwave machine (among Fig. 2 240, among Fig. 3 240) and antenna amplifier antennafire are (among Fig. 2 260, among Fig. 3 260) all must provide the connection of each cable according to above-mentioned requirement shown in Figure 3 design corresponding interface.
A kind of TDD digital micro-wave extension device of the present invention is by constituting proximal device with the wireless base station with near-end microwave machine and the microwave antenna that cable group is connected, with antenna and remote microwave machine and constitute remote equipment with the antenna amplifier antennafire that cable group is connected and form.The near-end microwave machine is the time division duplex heterodyne system transceiver of double conversion, realizes adaptive gain control with two automatically controlled adjustable attenuators, and reception and emission work in same carrier frequencies, receive and dispatch timing controlled by the wireless base station, realize time division duplex; The remote microwave machine is the time division duplex heterodyne system transceiver of single-conversion, realizes adaptive gain control with an automatically controlled adjustable attenuator; Antenna amplifier antennafire is a pair of power amplifier and low noise amplifier, works in the mobile communication carrier frequency; The reception and the emission of said distal ends equipment work in same carrier frequencies, transmitting-receiving is regularly by placing the wireless energy control units in the above-mentioned antenna amplifier antennafire to produce and control, realize time division duplex, and the assurance remote equipment can be worked under the unified monitoring of mobile communication system webmaster.Illustrated below in conjunction with accompanying drawing.In the following description, all based on using the 18/23/38GHz frequency range as an example, traditionally, the 18/23GHz frequency range claims Ku frequency range, and 38GHz is a millimeter wave frequency band.For the sake of simplicity, be generally called the Ku frequency range below.The intermediate frequency that uses in the following describes, 96MHz, 2GHz etc. as using in near-end, the remote microwave machine also treat as an example, can adopt other IF-FRE fully.
Fig. 5 block diagram shows the near-end microwave machine in a kind of TDD digital micro-wave extension device of the present invention.This microwave machine is by 2G Transmit-Receive Unit 513, microwave transmitting and receiving unit 512, and microwave local oscillation unit 511, critical pieces such as control unit 514 and power module 515 constitute.2G Transmit-Receive Unit 513 is finished the 96MHz intermediate-freuqncy signal of wireless base station indoor heating system 200 to frequency conversion and amplification between second intermediate frequency (2GHz), and include aforesaid attenuator 1 (5131) and attenuator 2 (5132), adjust with the transmitting-receiving gain-adaptive of realizing the near-end microwave machine; Frequency conversion and the amplification between second intermediate frequency and the microwave (ku wave band) finished in microwave transmitting and receiving unit 512; Microwave local oscillation unit 511 provides high-quality local vibration source for microwave transmitting and receiving unit 512; Control unit 514 is according to the transmitting-receiving timing controlled from wireless base station indoor heating system 200, monitored instruction is (by the control line in the cable group among Fig. 3 210 302,303 and 304) and the transmitting-receiving power level of measuring in real time, complete machine reception and emission are enabled, gain and output level are controlled, monitoring complete machine working condition and environmental parameter and to 200 reports of wireless base station indoor heating system; 515 bases of power module provide the power supply that respectively needs from the main power source (by the power line in the cable group among Fig. 3 210 305) of wireless base station indoor heating system 200 for complete machine.96MHz intermediate-freuqncy signal from wireless base station indoor heating system 200, enter near-end machine 2G Transmit-Receive Unit 513 through cable set 210, through up-conversion to the second intermediate frequency (2GHz), and amplify, second intermediate-freuqncy signal after the amplification is delivered to microwave transmitting and receiving unit 512 again, and up-conversion is to microwave frequency (Ku wave band) and amplify, deliver to antenna, be sent to remote termination.Then at first amplifying in microwave transmitting and receiving unit 512 with frequency conversion from the received signal of antenna becomes second intermediate frequency (2GHz) signal, by 2G Transmit-Receive Unit 513, downconverts to the 96MHz intermediate frequency, and amplifies again, delivers to wireless base station indoor heating system 200 then.This near-end microwave machine can provide reference clock by the reference clock line 307 in the cable group among Fig. 3 210, also can oneself equip the clock of high stable.
Fig. 6 block diagram shows the remote equipment in a kind of TDD digital micro-wave extension device of the present invention, comprises remote microwave machine 240 and antenna amplifier antennafire 260 and stube cable group 250.This remote microwave machine 240 can require to be installed in respectively identical or different geographical position according to rules with antenna amplifier antennafire 260.The antennal interface 270 of antenna amplifier antennafire 260 can connect mobile communication antenna, to cover a sub-district; Also can connect indoor covering system, for indoor covering system provides signal source.
When remote termination receives microwave signal from near-end microwave machine 220, in microwave transmitting and receiving equipment unit 322, amplify and be down-converted to the needed carrier frequency of mobile communication (for example a certain carrier frequency of TD-SCDMA system), rf signal line 311 in cable set 250 enters the power amplifier in the 2G Transmit-Receive Unit 261 in the antenna amplifier antennafire 260, be amplified to needed level, launch by antenna port 270.The signal that antenna port 270 is received, then be amplified to needed level by the low noise amplifier in the 2G Transmit-Receive Unit 261, rf signal line 311 in cable set 250 enters in the remote microwave machine 240 and to amplify in the microwave transmitting and receiving equipment unit 322 and upconvert to microwave frequency, is launched by microwave antenna again.
In Fig. 2, above-mentioned micro-wave extension device is realized the microwave transmission method that radio frequency zooms out, and the operation principle of said system is as follows: near-end microwave machine 220, remote microwave machine 240 and antenna amplifier antennafire 260 all are time division duplexs, complete synchronous working.That is to say that above-mentioned three parts will be in the base station state simultaneously in a moment (descending time slot), another moment (ascending time slot) then is in the base station accepting state simultaneously.The synchronous method of this realization is narrated in back of the present invention.At descending time slot (time slot of wireless base station emission), armed high-speed digital signal from above-mentioned wireless base station 200, use QPSK, 16QAM or other modes are carried out digital modulation and are passed through numeral to analogue converter (DAC) again and change intermediate-freuqncy signal into and deliver to transmitter in the above-mentioned near-end microwave machine 220 by the immediate frequency cable in the above-mentioned cable group 210, frequency conversion is amplified the back and is emitted to remote microwave machine 240 by microwave antenna 230, amplifying frequency conversion in this remote microwave machine 240 is the frequency of mobile communication work, deliver to above-mentioned antenna amplifier antennafire 260 by above-mentioned cable group 250 again, in above-mentioned antenna amplifier antennafire 260, be amplified to required launching electrical level, launch by antennal interface 270.At ascending time slot (time slot that the wireless base station receives), amplify through above-mentioned antenna amplifier antennafire 260 by the small-signal that above-mentioned antennal interface 270 receives, deliver to said distal ends microwave machine 240 by above-mentioned cable group 250, in this remote microwave machine 240, amplify and be converted to microwave frequency, reach above-mentioned near-end microwave machine 220 by above-mentioned microwave antenna 230, in this near-end microwave machine 220, amplify and downconvert to the intermediate-freuqncy signal of modulation, deliver to the receiving terminal of wireless base station 200 again by above-mentioned cable group 210.
At present, industry has been extensive use of base band fiber optic stretch technology, and how the present invention also provides on the basis of fiber optic stretch, implements the method for micro-wave extension of the present invention.See accompanying drawing 4 for details, among the figure, the 400th, industry is generally used improved fiber optic stretch far end box, it is connected with indoor base station with optical fiber, 410 is existing opto-electronic conversion/data multiplexing in the former fiber optic stretch cabinet/funtion parts such as control, 411,412 ..., 41n is existing digital intermediate frequency and digital-to-analogue/analog to digital conversion circuit in the former fiber optic stretch cabinet, 4 to 8 circuit are provided in a cabinet usually, be said n=4 to 8, the interface circuit that each signal among Fig. 3 A is provided 431,432 that need to increase,, 43n.Analog radio frequency front end in the former fiber optic stretch cabinet and amplifier etc. all can save, and funtion parts 410 such as the interior existing control of former fiber optic stretch cabinet are wanted corresponding modify software.Like this, former fiber optic stretch far end box just is transformed into the interface of micro-wave extension cabinet is provided.
Important component part of the present invention is to be provided with wireless energy control units 262 in the remote equipment (antenna amplifier antennafire 260 or remote microwave machine 240).This wireless energy control units 262 can adopt the terminal mould of mobile communication system fast, increases interface and revises application layer software.Below, be example with the TD-SCDMA system, describe the work of this module in detail.This wireless energy control units 262 is by TD-SCDMA system terminal radio-frequency (RF) transceiver, the baseband digital signal processor, and MCU and respective memory constitute.Its radio-frequency (RF) transceiver is coupled with the 2GHz radiofrequency signal of transmitting in above-mentioned antenna amplifier antennafire 262.When this antenna amplifier antennafire power supply opening, will be in accepting state, above-mentioned wireless energy control units 262 is searched for residing sub-district immediately as same the terminal of opening electricity, to obtain initial synchronisation and to sign in in the network.Then, obtain the working status parameter of this microwave system from network management center, as the transmitted power level of needs, uplink and downlink timeslot number or the like.After above-mentioned acquisition synchronously, the time difference dT between the initial moment of DwPTS that measures and UpPTS, according to the frame structure of TD-SCDMA standard, can calculate the time delay of this micro-wave extension system:
T=(150-dT)/2 (microsecond) (1)
And downlink enables zero-time Tx
Tx=To+275+nx675-2xT-6 (microsecond) (2)
Enable zero-time Rx with up reception
Rx=To+80 (microsecond) (3)
Above various in, dT is the measured time difference;
To is the measured initial moment of DwPTS;
Tx enables zero-time for the remote equipment downlink;
Rx is that the up reception of remote equipment enables zero-time;
N is the ascending time slot number;
Like this, the remote equipment of this micro-wave extension (comprising remote microwave machine and antenna amplifier antennafire) just can normally be pressed the work of system requirements time division duplex.In the course of the work, also will be by the requirement of webmaster, the operating state of equipment and ambient conditions are measured and reported.When the uplink and downlink timeslot ratio of system changed, the downlink of this microwave equipment enabled zero-time and also uses above-mentioned formula (2) result calculated to change.
Claims (10)
1, a kind of time division duplex mobile communication system micro-wave extension device is characterized in that: described micro-wave extension device by the near-end microwave machine (220) that is connected with cable group (210) with wireless base station (200), distal portion from remote microwave machine (240) form with the antenna amplifier antennafire (260) that cable group (250) is connected with remote microwave machine (240); By cable (210) control, the synchronous and control of remote microwave machine (240) and antenna amplifier antennafire (260) is realized by space communication by wireless energy control units by wireless base station (200) in the synchronous and control of near-end microwave machine (220); In the micro-wave extension device, use 3 automatically controlled adjustable attenuators to realize adaptive gain control at least.
2, time division duplex mobile communication system micro-wave extension device as claimed in claim 1 is characterized in that: the cable group (210) that wireless base station (200) are connected with near-end microwave machine (220) comprises the cable (301) of a transmission intermediate frequency signal; Article one, transmit the control line (302) that control near-end microwave machine (301) receives or launches, the near-end microwave machine is synchronous with the transmitting-receiving of wireless base station (200) by this control line (302) realization; One group of data wire (303) and clock line (304) of near-end microwave machine (220) being carried out monitoring; , a service cable (305); , an earth connection (306).
3, time division duplex mobile communication system micro-wave extension device as claimed in claim 2 is characterized in that: the cable group (210) that wireless base station (200) are connected with near-end microwave machine (220) also comprises a reference clock line (307).
4, time division duplex mobile communication system micro-wave extension device as claimed in claim 1 is characterized in that: the cable group (250) that remote microwave machine (240) is connected with antenna amplifier antennafire (260) comprises the cable (311) of a transmitting radio frequency signal; Article one, transmission control antenna amplifier (260) receives or the control line (312) of emission; One group of data wire (313) and clock line (314) of antenna amplifier antennafire (260) being carried out monitoring; , a service cable (315); An and earth connection (316).
5. time division duplex mobile communication system micro-wave extension device as claimed in claim 1, it is characterized in that: 2G Transmit-Receive Unit (513) in near-end microwave machine (220) and cable group (210) interface end are provided with the loss of at least one automatically controlled adjustable mean frequency attenuator (5131) with the compensating cable group, the attenuation of this attenuator (5131) is controlled according to the down transmitting power level that the output port in microwave transmitting and receiving unit (512) records by near-end microwave machine (220) inner control unit (514), guarantees that this transmitted power level is a fixed value.
6. time division duplex mobile communication system micro-wave extension device as claimed in claim 1, it is characterized in that: in near-end microwave machine (220), be provided with at least one automatically controlled adjustable mean frequency attenuator (5132) in the up receiving lines with the space attenuation between the compensation microwave antenna (230), the attenuation of this attenuator (5132) is subjected to near-end microwave machine (220) inner control unit according to controlling at the preceding up received power level that records of attenuator (5131) at 2G Transmit-Receive Unit (513) and cable group (210) interface end place, guarantees that this maximal received power level is no more than a fixed value.
7. time division duplex mobile communication system micro-wave extension device as claimed in claim 1, it is characterized in that: in the microwave transmitting and receiving equipment unit (322) of remote microwave machine (240), be provided with at least one automatically controlled adjustable attenuator (3221) with the loss of compensating cable group (250) and the space attenuation between the microwave antenna (230), the attenuation of this attenuator is controlled according near the down transmitting power level that records output interface (270) by antenna amplifier antennafire (260) or remote microwave machine (240) inner control unit, guarantees that this transmitted power level is a fixed value.
8. time division duplex mobile communication system micro-wave extension device as claimed in claim 1, it is characterized in that: the near-end microwave machine in the micro-wave extension device is the time division duplex heterodyne system transceiver of double conversion, realize adaptive gain control with two automatically controlled adjustable attenuators, reception and emission work in same carrier frequencies, receive and dispatch timing controlled by the wireless base station, realize time division duplex; The remote microwave machine is the time division duplex heterodyne system transceiver of single-conversion, realizes adaptive gain control with an automatically controlled adjustable attenuator; Antenna amplifier antennafire is a pair of power amplifier and low noise amplifier, works in the mobile communication carrier frequency; Described remote microwave machine works in same carrier frequencies with the reception and the emission of the remote equipment of antenna amplifier antennafire that is connected with cable group and antenna formation, transmitting-receiving is regularly by placing the wireless energy control units in above-mentioned antenna amplifier antennafire or the remote microwave machine to produce and control, realize time division duplex, and the assurance remote equipment can be worked under the unified monitoring of mobile communication system webmaster.
9. an application rights requires the micro-wave extension method of 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 described devices, it is characterized in that: near-end microwave machine (220), remote microwave machine (240) and antenna amplifier antennafire (260) constantly will be in the base station state simultaneously at a descending time slot, constantly then be in the base station accepting state simultaneously at another ascending time slot, at descending time slot, armed high-speed digital signal from above-mentioned wireless base station (200), use QPSK, 16QAM or other modes are carried out digital modulation and are passed through numeral to analogue converter (DAC) again and change intermediate-freuqncy signal into and deliver to transmitter in the near-end microwave machine (220) by the immediate frequency cable in the described cable group (210), frequency conversion is amplified the back and is emitted to remote microwave machine (240) by microwave antenna (230), amplifying frequency conversion in this remote microwave machine (240) is the frequency of mobile communication work, deliver to described antenna amplifier antennafire (260) by described cable group (250) again, in described antenna amplifier antennafire (260), be amplified to required launching electrical level, launch by antennal interface (270); At ascending time slot, amplify through described antenna amplifier antennafire (260) by the small-signal that described antennal interface (270) receives, deliver to described remote microwave machine (240) by described cable group (250), in this remote microwave machine (240), amplify and be converted to microwave frequency, reach described near-end microwave machine (220) by described microwave antenna (230), in this near-end microwave machine (220), amplify and downconvert to the intermediate-freuqncy signal of modulation, deliver to the receiving terminal of wireless base station (200) again by above-mentioned cable group (210).
10. as claims 9 described micro-wave extension methods, it is characterized in that: the radio-frequency (RF) transceiver of the wireless energy control units (262) in described antenna amplifier antennafire (260) or the remote microwave machine (240) and the coupling of the 2GHz radiofrequency signal of transmission, when this antenna amplifier antennafire power supply opening, to be in accepting state, above-mentioned wireless energy control units (262) is searched for residing sub-district immediately, to obtain initial synchronisation and to sign in in the network, obtain the working status parameter of this microwave system then from network management center, after above-mentioned acquisition synchronously, time difference dT between the initial moment of DwPTS that measures and UpPTS, according to the frame structure of TD-SCDMA standard, can calculate the time delay of this micro-wave extension system:
T=(150-dT)/2 (microsecond) (1)
And downlink enables zero-time Tx
Tx=To+275+nx675-2xT-6 (microsecond) (2)
Enable zero-time Rx with up reception
Rx=To+80 (microsecond) (3)
Above various in, dT is the measured time difference;
To is the measured initial moment of DwPTS;
Tx enables zero-time for the remote equipment downlink;
Rx is that the up reception of remote equipment enables zero-time;
N is the ascending time slot number;
Like this, the remote equipment of this micro-wave extension is normally pressed the work of system requirements time division duplex, in the course of the work, also will be by the requirement of webmaster, the operating state of equipment and ambient conditions are measured and reported, when the uplink and downlink timeslot ratio of system changed, the downlink of this microwave equipment enabled zero-time and also uses above-mentioned formula (2) result calculated to change.
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| CNA2006100226982A CN101035323A (en) | 2006-12-29 | 2006-12-29 | Micro-wave extension method and device of the time division duplex mobile communication system |
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