CN1555141A - Device and method for realizing flexible networking used in time division duplex synchronous system - Google Patents
Device and method for realizing flexible networking used in time division duplex synchronous system Download PDFInfo
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- CN1555141A CN1555141A CNA2003101174905A CN200310117490A CN1555141A CN 1555141 A CN1555141 A CN 1555141A CN A2003101174905 A CNA2003101174905 A CN A2003101174905A CN 200310117490 A CN200310117490 A CN 200310117490A CN 1555141 A CN1555141 A CN 1555141A
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Abstract
A device for realizing flexible networking in a time-division duplex synchronous system includes three ways: the base station and a RF pulling device, the base station and a fiber direct-put station device and a base station and an active indoor cover device among which, the three devices can measure timely the time delay from the base station to one of the said three devices to be added to the emit predictor of the base station. Since the said time delay does not influence that of a space interface and the said base station controls the emitting powers of the said devices, the problem of reduction of the covered sphere is resolved and the base station controls the time-division amplifying of the front reverse amplifier of the devices the front reverse signal interference is resolved.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to the apparatus and method that realize flexible networking in time division duplex (TDD) synchro system.
Background technology
Because the up-downgoing of TDD system is with frequently, so being mode with time division duplex, it transmits data, i.e. up-downgoing data are transmissions at interval.Just because of the data of up-downgoing are to send at interval and aloft are with frequently; if so the data of base station down send after travelling carriage through very long time delay return data; be that time-delay is excessive between the up-downgoing data; just can cause the difference of up-downgoing data time-delay to surpass the interval of protecting time slot (Guard Period); thereby the next descending time slot of ascending time slot and base station that mobile phone is returned aloft bumps against with frequency or has disturbed next ascending time slot, thereby and can make the data of returning not cause loss of data in receiving slot.So there is maximum covering radius in the base station.
Because described protection time slot does not pass any information, the long utilance that will influence the air frequencies resource of protection time slot is not so described protection time slot can be long.And described protection time slot is certain, and the maximum covering radius of TDD system just is subjected to this protection restriction at interval.
For common repeater, can't be used because the time delay between base station and the repeater is unknown, time delay has also influenced covering radius between base station and the repeater, therefore the covering radius of common repeater can be less than the maximum covering radius of base station, and the covering radius of the big more common repeater of distance between base station and the common repeater just can be more little.For active indoor cladding system,, also there is same problem if feed and active indoor cladding system distance are long.
It is described base station as shown in Figure 1 and the schematic diagram that links of common repeater.Existing systems comprises a base station unit 101, and it comprises a baseband portion 1011 and a radio frequency part 1012.One repeater 103, can be that wireless discharging-directly station also can be an optical fiber repeater, it comprises the amplifier 1031 and a down link amplifier 1032 of a up link, and carries out communication with described base station unit 101 by space channel (for wireless discharging-directly station) or optical fiber (for optical fiber repeater) 102 and be connected.One travelling carriage 105 carries out communication by space channel 104 with described repeater 103 and is connected.For frequency division duplex system FDD, system shown in Figure 1 can operate as normal, but for tdd systems TDD, because preceding oppositely is same frequency range, so two amplifiers 1031 of described repeater 103 and 1032 can not be worked simultaneously, when that is to say an amplifier job, the another one amplifier must turn-off.So just, brought a stationary problem, how the reverse link amplifier carries out time-division work before that is to say.Also have a problem to be because the time-delay of space channel 102 is unknown, so the distance of described space channel 102 has also influenced the largest coverage distance of described repeater 103 to the space channel 104 between the described travelling carriage 105.
So because up-downgoing time-division characteristics, the repeater of not adopting system synchronization of traditional approach can't operate as normal.And if add that to the repeater GPS (Global Position System, global positioning system) provides system synchronization can roll up cost undoubtedly.Also there is same stationary problem in prior art for active indoor cladding system.Reverse methods such as power detection attempted controlling back emitted before the TDD system repeater before some patent was utilized in the repeater, but this method is subject to disturb, and the coverage of introducing thus reduces problem and interference problem all fails to be resolved.
Therefore, obviously there is defective in prior art, and awaits being improved.
Goal of the invention
The object of the present invention is to provide a kind of method and apparatus that is applied to realize in the time division duplex synchro system flexible networking, its base station can be with one or more radio frequencies to zoom out or optical fiber repeater or active indoor cladding system, and amplify by the preceding reverse timesharing that the synchronous control signal that the preceding reverse timesharing that base station side in the optical fiber transmits is amplified is controlled radio frequency extension apparatus or optical fiber direct amplification station arrangement or active indoor cladding system, proposes a kind of simply, the method that increases system cost hardly solves the optical fiber repeater of TDD set forth above system, the maximum coverage range problem and the stationary problem of active indoor cladding system.
Technical scheme of the present invention is as follows:
A kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more radio frequency extension apparatus, wherein,
Its base station comprise baseband portion and with an Optical Fiber Interface Board of radio frequency extension apparatus interface, described baseband portion comprises the processing and the control section of base band;
Its radio frequency extension apparatus comprises Optical Fiber Interface Board and base station transceiver, high power amplifier, radio-frequency front-end and the low noise amplifier with described base-station interface;
One optical fiber, connect described base station and described radio frequency extension apparatus, its transmission of digital signals, be used for the service-data oriented of base band clock signal, control signal and TDD system of system passed to described radio frequency extension apparatus from described base station, and the reverse traffic data of reverse control signal and TDD system are passed to described base station from described radio frequency extension apparatus;
Described reverse control signal also comprises the synchronous control signal of the preceding oppositely timesharing of control amplification, the control signal and the signal of communication of measurement time delay.
Described device, wherein, described signal of communication is used for controlling the scaled power and the transmit frequency band of radio frequency extension apparatus.
Described device, wherein, described radio frequency clock signal can be by the phase-locked recovery of the dagital clock signal of described base band.
A kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more optical fiber direct amplification station arrangements, wherein,
Its base station comprise baseband portion, base station transceiver and with the Optical Fiber Interface Board of optical fiber direct amplification station interface, described base band comprises the processing and the control section of base band;
Its optical fiber repeater comprises Optical Fiber Interface Board and high power amplifier, radio-frequency front-end and the low noise amplifier with base-station interface;
One optical fiber, connect described base station and described optical fiber repeater, its transmission of analogue signal, be used for the service-data oriented of clock signal, control signal and TDD system of system passed to described optical fiber repeater from described base station, and the reverse traffic data of reverse control signal and TDD system are passed to described base station from described optical fiber repeater;
Described reverse control signal comprises the synchronous control signal of the preceding oppositely timesharing of control amplification, the control signal and the signal of communication of measurement time delay.
A kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more active indoor cladding systems, wherein,
Its base station comprises baseband portion and radio frequency part, and described baseband portion comprises Base-Band Processing and control section, and described radio frequency part comprises base station transceiver, high power amplifier, radio-frequency front-end and low noise amplifier;
Its active indoor cladding system comprises master unit and a plurality of far-end unit;
Be connected oppositely the timesharing control signal of amplifying, control signal and the signal of communication of measuring time delay before the service signal of transmission TDD system and the control between described base station and the described active indoor cladding system between described base station and the described active indoor covering by optical fiber or cable.
Described device, wherein, described base station is zoomed out the station by a repeater or a radio frequency and is substituted.
A kind of method that is applied to realize in the time division duplex synchro system flexible networking, it is applied to, and the base station adds radio frequency extension apparatus or the base station adds optical fiber repeater or the base station adds active indoor cladding system, and this method may further comprise the steps:
A) signal that will measure time delay passes to radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by optical fiber from the base station, after receiving the delay time signal that records, radio frequency extension apparatus or optical fiber repeater or active indoor cladding system at once this signal is returned to described base station, time delay is measured according to the signal that this returns in described base station, and being described base stations with the time delay measured divided by 2 zooms out or the time delay of described optical fiber repeater or active indoor cladding system to described radio frequency;
B) add the time delay of the above base station in the lead of described base station to radio frequency extension apparatus or optical fiber repeater or active indoor cladding system;
C) in this base station, control the transmitting power of radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by the signal of communication in the described optical fiber;
D) synchronous control signal that preceding reverse timesharing is amplified in described base station side passes to described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by described optical fiber, and then controls the timesharing amplification of the preceding sign-changing amplifier of said apparatus.
A kind of method and apparatus that is applied to realize in the time division duplex synchro system flexible networking provided by the invention, since in the TDD system radio frequency zoom out or optical fiber repeater or active indoor cladding system zoom out the fiber lengths covering radius that can not have the greatest impact, and this adds optical fiber repeater or wireless discharging-directly station in conventional base station or active indoor cladding system can't be finished, this also makes can use under the long situation of optical fiber that radio frequency zooms out or optical fiber repeater or active indoor cladding system, and fiber lengths herein is not subject to maximum covering radius, therefore base station of the present invention can be with a plurality of radio frequencies to zoom out or optical fiber repeater or active indoor cladding system, if count from the position of base band, base station of the present invention is because had radio frequency to zoom out or optical fiber repeater, and its total covering radius strengthens than the radius of the conventional base station of TDD system.
The synchronous control signal that amplifies owing to the preceding reverse timesharing of transmitting by base station side in the optical fiber in the inventive method is controlled the preceding reverse timesharing amplification of radio frequency extension apparatus or optical fiber direct amplification station arrangement or active indoor cladding system in addition, this method is not subject to disturb, when increasing coverage, overcome the influence of disturbing, realize the maximum coverage range of flexible networking and don't minimizing system, and solved stationary problem.
Description of drawings
In the accompanying drawing,
Fig. 1 is the base station of prior art and the schematic diagram that links of common direct discharging station;
Fig. 2 is the schematic diagram that links that TDD of the present invention base station adds radio frequency extension apparatus and travelling carriage;
Fig. 3 is the schematic diagram that links that TDD of the present invention base station adds optical fiber direct amplification station arrangement and travelling carriage;
Fig. 4 is the schematic diagram that links that TDD of the present invention base station adds active indoor cladding system and travelling carriage;
Fig. 5 is the time chart of signal emission, reception between device of the present invention and the travelling carriage.
Embodiment
Describe in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Central principle of the present invention is, because radio frequency extension apparatus or optical fiber direct amplification station arrangement or active indoor cladding system can be measured the time delay of base station to this radio frequency extension apparatus or optical fiber repeater or active indoor cladding system in real time, thereby can add this section time delay in this base station lead, the transmitting power of described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system can be controlled by described base station.Because it is that the base station transmitting power (base station transmitting power of issuing mobile phone in this message be come according to the scaled power of described radio frequency extension apparatus or described optical fiber repeater antenna opening fixed) and the received power of this mobile phone according to this mobile phone is issued in the base station in message calculated with a certain path loss formula that the time that mobile phone returned before is synchronously judged, after being somebody's turn to do synchronously, can adjust aerial return time by regularly adjusting mechanism, so can not influence the time delay situation of air interface the time of delay of optical fiber.But the time interval that transmits and receives that arrives base band through optical fiber can increase, because preceding reverse signal is with receiving and dispatching two different optical fiber or receiving and dispatching an optical fiber but be the light wave transmissions of different frequency with the ripple of different wave length, can carry out simultaneously so in optical fiber, transmit and receive data, thereby can not influence covering radius.
Method and apparatus of the present invention can be realized flexible networking and don't reduce the maximum coverage range of system and solve stationary problem that the device of TDD system of the present invention can have following three kinds of forms: the base station adds radio frequency extension apparatus, the base station adds the optical fiber direct amplification station arrangement and the base station adds active indoor cladding system.
As shown in Figure 2 be TDD of the present invention base station and the schematic diagram that links of radio frequency extension apparatus.Wherein, described base station 201 comprise the processing of base band and control section 2011 and with the Optical Fiber Interface Board 2012 of described radio frequency extension apparatus 203 interfaces, what the base station 101 of base station 201 described here and prior art was different is the radio frequency part 1012 that this base station 201 does not have base station transceiver TRX, high power amplifier, radio-frequency front-end and low noise amplifier etc., and many Optical Fiber Interface Boards 2012 with described radio frequency extension apparatus interface promptly are equivalent to radio frequency part is zoomed out.This radio frequency extension apparatus 203 also comprises and the Optical Fiber Interface Board 2032 of described base station 201 interfaces and the radio frequency part 2031 that comprises base station transceiver TRX, high power amplifier, radio-frequency front-end and low noise amplifier etc.Described base station 201 is connected by an optical fiber 202 with described radio frequency extension apparatus 203, transmission is digital signal in this optical fiber 202, this optical fiber 202 will be passed to described radio frequency extension apparatus 203 to the service-data oriented of base band clock signal, control signal and the TDD system of system from described base station 201, and wherein said radio frequency clock signal can be by the phase-locked recovery of the dagital clock signal of described base band.Described optical fiber 202 also will be passed to described base station 201 to the reverse traffic data of reverse control signal and TDD system from described radio frequency extension apparatus 203, and wherein said reverse control signal comprises synchronous control signal, the control signal of measuring time delay and the signal of communication etc. that the preceding oppositely timesharing of control is amplified.One travelling carriage 105 is connected with described radio frequency extension apparatus 203 communications by space channel 104.
As shown in Figure 3 be TDD of the present invention base station and the schematic diagram that links of optical fiber direct amplification station arrangement.Base station 301 shown in the figure, the common part 3011 of processing, control section and base station transceiver TRX and one and the Optical Fiber Interface Board 3012 of optical fiber repeater 303 interfaces that comprises base band, it is different with described base station 201 is that it has comprised base station transceiver TRX and described base station 201 does not comprise TRX, promptly be equivalent to TRX is moved on in the base station, after thereby signal to be transmitted is handled through this TRX, what described base station 301 Optical Fiber Interface Boards 3012 sent is analog signal, and Optical Fiber Interface Board 2032 transmissions of described base station 201 is digital signal; What described base station 301 and described base station 101 were different is that this base station 301 does not comprise high power amplifier, radio-frequency front-end and low noise amplifier 1012, and many Optical Fiber Interface Boards 3012.Described optical fiber repeater 303, it comprises and the Optical Fiber Interface Board 3032 of described base station 301 interfaces and high power amplifier, radio-frequency front-end and low noise amplifier promptly 3031, what described optical fiber repeater 303 and repeater of the prior art 103 were different is that this optical fiber repeater 303 requires to have the Optical Fiber Interface Board 3032 that is connected with described base station 301, and described repeater 103 can not have this part, and it is by the be coupled aerial signal of a part of base station of antenna feeder.What connect described base station 301 and described optical fiber repeater 303 is optical fiber 302, what transmit in this optical fiber 302 as mentioned above is analog signal, this optical fiber 302 will send the service-data oriented of the clock signal of system, control signal and TDD system to described optical fiber repeater 303 from described base station 301, and this optical fiber also will be passed to described base station 301 to the reverse traffic data of reverse control signal and TDD system from described optical fiber repeater 303.Wherein said reverse control signal comprises synchronous control signal, the control signal of measuring time delay and the signal of communication etc. that the preceding oppositely timesharing of control is amplified.Described travelling carriage 105 is connected with described optical fiber repeater 303 communications by space channel 104.
It is TDD of the present invention base station as shown in Figure 4 and the schematic diagram that links of active indoor cladding system.Base station 401 shown in the figure is a feed, and this base station 401 comprises baseband portion and radio frequency part, and baseband portion comprises Base-Band Processing and control section, and radio frequency part comprises TRX, high power amplifier, radio-frequency front-end and low noise amplifier etc.The described base station 401 here is the feed of the indoor covering of available other types also, as repeater, radio frequency zoom out station etc. all can, can and measure the signal of time delay and service signal is delivered to active indoor covering and can be delivered to the base station to corresponding inverse signal and gets final product the control amplifying signal but whichsoever all will have.Described active indoor cladding system 403 comprises master unit (MU) and a plurality of far-end unit (RU) etc.Be connected with cable or optical fiber 402 between described base station 401 and the described indoor covering 403, the service signal that this cable or optical fiber 402 not only will transmit the TDD system also will transmit before the control control signal, the control signal of measuring time delay and the signal of communication etc. that oppositely timesharing is amplified.Described travelling carriage 105 is connected by active indoor cladding system 403 communications of space channel 104 and this.
As shown in Figure 5, be time chart between described TDD base station of the present invention and radio frequency extension apparatus or optical fiber repeater or active indoor cladding system and the travelling carriage.It is that time slot with TD-SCDMA (time division SCDMA) base station is divided into embodiment and introduces that TDD base station time slot described here is divided.Wherein TD-SCDMA subframe structure 501～506 is represented the signal timing relation of uplink and downlink link respectively, and their subframe structure is identical, is that example describes with subframe structure 501.Time slot TS0 (Time Slot0) is a descending time slot, and that it transmits is Common Control Physical Channel (CCPCH).DwPTS is a descending pilot frequency time slot, and UpPTS is a uplink pilot time slot, and GP (Guard Period) is the protection time slot between descending pilot frequency time slot DwPTS and the uplink pilot time slot UpPTS, and protection time slot GP is 75 microseconds.TS1～TS6 is 6 conventional time slots, and wherein they are distribution that ascending time slot or descending time slot depend on the time slot transfer point.Only drawn TS1 and TS6 among Fig. 5, other time slot replaces with ellipsis.
The limited resource and the reason of covering radius among the concrete analysis TD-SCDMA below: as previously mentioned, because the up-downgoing of described TDD system is with frequently, so the data of up-downgoing are to send at interval.Just because of the data of up-downgoing are to send at interval and are to be with frequently aloft; if so the data of base station down send after travelling carriage through very long time delay return data; be that time-delay is excessive between the up-downgoing data; cause the difference of up-downgoing data time-delay to surpass the interval of protecting time slot (Guard Period); the next descending time slot of ascending time slot and base station that mobile phone is returned aloft bumps against with frequency or has disturbed next ascending time slot, and can make the data of returning can not cause loss of data in receiving slot.
For fear of this phenomenon, just there is a maximum covering radius described TDD base station.Shown in the subframe structure among Fig. 5 501; its theoretical maximum covering radius carries out not interference calculation mutually: UpPTS and DwPTS according to uplink downlink is separated by that promptly to protect time slot GP be 75 microseconds to 96 chips; (75*10^-6) * (3*10^8)/2/1000=11.25Km is then arranged; wherein 3*10^8 is the light velocity; unit is m/s; be meant double distance divided by 2, promptly the theoretical coverage radius of TD-SCDMA base station can not surpass 11.25Km.Light wave transmits reason electromagnetic waves such as reflection owing to barrier, refraction aloft much not according to straightline propagation, so the actual covering radius of TD-SCDMA base station is also littler than 11.25 kilometers.Through after the uplink synchronous, the time interval GP of 16 chips should not be the factor of restriction covering radius between each time slot, and multidiameter delay surpasses 16GP and has less probability.
If the base station adds common repeater, because the distance between base station and the common repeater is unknown, this part further reduces the covering radius of repeater apart from meeting, analyzes further below that base station that the present invention proposes adds that radio frequency zooms out or optical fiber repeater or active indoor cladding system can not reduce the reason of covering radius.501,503,505 3 pack modules (these modules indicate the vertical bar line) are as shown in Figure 5 represented the signal timing relation of the down link of base station transmission respectively, they represent that successively signal is in the baseband transmission time of base station (Node B base band Tx) 501, signal is in the launch time of radio-frequency antenna mouth (Node B RF Tx) 503, and signal is in the time of mobile phone reception place (UE Rx) 505.506,504,502 3 pack modules (these modules indicate the horizontal stripe line) are represented the signal timing relation of the up link of mobile phone transmission respectively, they represent that successively signal is in the time of mobile phone emission place (UE Tx) 506, signal is at base band radio-frequency antenna mouth time of reception (Node B RF Rx) 504, and signal is at the base band time of reception (Node B base band Rx) 502 of base station.Wherein signal is the same time at the time of mobile phone reception place (UE Rx) 505 and signal in the time of mobile phone emission place (UE Tx) 506.The dot-dash vertical line 507 of original position is the system synchronization time among Fig. 5, and described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system are aimed at the system synchronization time strictness that this chain-dotted line 507 indicates in antenna opening launch time.
Suppose that described base station is TF to the time delay of described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system, as shown in Figure 5, baseband module must shift to an earlier date framing for this reason, time in advance should equal TF, i.e. the present invention measure in real time from described base station to the time of delay of the optical fiber of described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system.If TA is the propagation time from described radio frequency extension apparatus or optical fiber direct amplification station antenna to described travelling carriage, this travelling carriage receives described signal of base station behind system time delay TA duration so.Described travelling carriage is a benchmark with the moment that receives described signal of base station, to described base station transmit signals.Described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system antenna receive the upward signal of described travelling carriage after postponing 2TA, this signal again from Optical Fiber Transmission to described baseband module, postponed the TF time again.The baseband module of described like this base station time of 2TA+TF behind system time receives the upward signal of described travelling carriage.With respect to the baseband transmission time, postponed for 2 (TA+TF) times, the hysteresis that this delay will cause base station baseband to be handled.
Because it is that transmitting power (scaled power of radio frequency extension apparatus or optical fiber repeater or active indoor cladding system antenna opening) and its received power according to the base station of this mobile phone is issued in described base station in message calculated according to a certain path loss formula that the return time of mobile phone is judged, so can not influence air interface time delay situation the time of delay of optical fiber.But, the time interval that transmits and receives that arrives base band through optical fiber can increase, because preceding reverse signal is with receiving and dispatching two different optical fiber or receiving and dispatching an optical fiber but be the light wave transmissions of different frequency with the ripple of different wave length, can carry out simultaneously so transmit and receive data in the optical fiber, thereby can not influence covering radius.So according to the present invention, radio frequency extension apparatus or optical fiber repeater or active indoor cladding system zooms out fiber lengths and can not influence covering radius in the TDD system.And this adds optical fiber repeater or wireless discharging-directly station in conventional base station or active indoor cladding system can't be finished.Because a plurality of radio frequency extension apparatus or optical fiber repeater can be with in base station of the present invention, if count from the position of base band, described base station of the present invention is because had described radio frequency extension apparatus or optical fiber repeater, and its total covering radius strengthens than the radius of the conventional base station of TDD system.
Can realize flexible networking in the described TDD of the present invention system and don't reduce the maximum coverage range of system and solve the method for stationary problem that concrete steps are as follows:
The first step: the present invention passes to described radio frequency extension apparatus or optical fiber direct amplification station arrangement or active indoor cladding system to the signal of measuring time delay by optical fiber from described base station, at once this signal is returned described base station after described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system receive signal, time delay is measured by the signal that this returns in this base station.To be described base stations divided by 2 zoom out or the time delay TF of optical fiber direct amplification station arrangement or active indoor cladding system to described radio frequency the time delay of measuring.The time T F here can be measured in real time by programmable logic device, also can measure with additive method, and these are all within protection scope of the present invention.The time T F here can be the average result of repeatedly measuring, and is familiar with all knowing of industry those of ordinary skill, all should be within protection scope of the present invention through processing such as certain statistical averages with thought of the present invention.
Second step: add the described time delay TF of above-mentioned base station in the baseband transmission lead of described base station to described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system.
The 3rd step: the present invention controls the transmitting power of described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system in described base station by signal of communication in the optical fiber.Mobile phone judges that aerial time delay was to calculate according to a certain path loss formula in transmitting power (radio frequency zooms out or the power of the above-mentioned channel of optical fiber direct amplification station arrangement antenna opening) and its received power that BCH or DwPTS issue its base station according to described base station before synchronously.The present invention here controls the transmitting power of described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system with the base station, so that mobile phone can correctly be estimated the TA time delay.Synchronously, can adjust aerial return time by regularly adjusting mechanism.
The 4th step: the synchronous control signal that the present invention amplifies preceding reverse timesharing in described base station side passes to described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by optical fiber, and then controls the timesharing amplification of the preceding sign-changing amplifier of said apparatus.
For common repeater or active indoor cladding system, can't be used owing to time delay between base station and repeater or the active indoor cladding system is unknown, time delay has also influenced covering radius between base station and repeater or the active indoor cladding system, therefore the actual covering radius of common repeater or active indoor cladding system can be less than the maximum covering radius of base station, and the big more common repeater of distance between base station and common repeater or the active indoor cladding system or the covering radius of active indoor cladding system just can be more little.
And described radio frequency extension apparatus of the present invention or optical fiber repeater or active indoor cladding system can be measured the time delay of described base station to described radio frequency extension apparatus or optical fiber direct amplification station arrangement or active indoor cladding system in real time, thereby can add in the baseband transmission lead that this section time delay, described radio frequency zoom out or the transmitting power of optical fiber direct amplification station arrangement or active indoor cladding system can be controlled by described base station.Because it is that transmitting power (transmitting power of issuing the base station of this mobile phone in the message be come according to the scaled power of described radio frequency extension apparatus or optical fiber direct amplification station arrangement antenna opening fixed) and its received power according to the base station of this mobile phone is issued in described base station in message calculated according to a certain path loss formula that the return time of mobile phone is judged, so can not influence air interface time delay situation the time of delay of optical fiber.But the time interval that transmits and receives that arrives base band through optical fiber can increase, because preceding reverse signal is with receiving and dispatching two different optical fiber or receiving and dispatching an optical fiber but be the light wave transmissions of different frequency with the ripple of different wave length, can carry out simultaneously so transmit and receive data in the optical fiber, thereby can not influence covering radius.
According to the present invention, radio frequency extension apparatus or optical fiber repeater or active indoor cladding system zooms out the maximum covering radius that fiber lengths can not influence the base station in described TDD system.And this adds in optical fiber repeater or wireless discharging-directly station or the active indoor cladding system and can't realize in conventional base station.This also makes uses radio frequency extension apparatus or optical fiber repeater or active indoor cladding system and becomes possible (fiber lengths herein is not subject to maximum covering radius) under the long situation of optical fiber.Because base station of the present invention can be with a plurality of radio frequencies to zoom out or optical fiber repeater or active indoor cladding system, if count from the position of base band, base station of the present invention is because had radio frequency extension apparatus or optical fiber repeater, and its total covering radius strengthens than the radius of the conventional base station of TDD system.
According to the inventive method above-mentioned steps, the synchronous control signal that the i.e. preceding reverse timesharing of transmitting by base station side described in the optical fiber is amplified is controlled the preceding reverse timesharing of radio frequency extension apparatus or optical fiber repeater or active indoor cladding system and is amplified, reverse signal phase mutual interference before avoiding, the inventive method is not subject to the influence disturbed, and the coverage of introducing thus reduces problem and interference problem has obtained fine solution.
Above embodiment is that example is in order to analyze time delay relation and technical scheme of the present invention more clearly with TD-SCDMA, method and apparatus of the present invention is suitable equally to other TDD system, those skilled in the art that should be understood that the various corrections of embodiments of the invention and change and should drop in design of the present invention and the claims limited range.
Claims (7)
1, a kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more radio frequency extension apparatus, wherein,
Its base station comprise baseband portion and with an Optical Fiber Interface Board of radio frequency extension apparatus interface, described base band comprises the processing and the control section of base band;
Its radio frequency extension apparatus comprises Optical Fiber Interface Board and base station transceiver, high power amplifier, radio-frequency front-end and the low noise amplifier with described base-station interface;
One optical fiber, connect described base station and described radio frequency extension apparatus, its transmission of digital signals, be used for the service-data oriented of base band clock signal, control signal and TDD system of system passed to described radio frequency extension apparatus from described base station, and the reverse traffic data of reverse control signal and TDD system are passed to described base station from described radio frequency extension apparatus;
Described reverse control signal also comprises the synchronous control signal of the preceding oppositely timesharing of control amplification, the control signal and the signal of communication of measurement time delay.
2, device according to claim 1 is characterized in that, described signal of communication is used for controlling the scaled power and the transmit frequency band of radio frequency extension apparatus.
3, device according to claim 2 is characterized in that, described radio frequency clock signal can be by the phase-locked recovery of the dagital clock signal of described base band.
4, a kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more optical fiber direct amplification station arrangements, wherein,
Its base station comprise baseband portion, base station transceiver and with the Optical Fiber Interface Board of optical fiber direct amplification station interface, described base band comprises the processing and the control section of base band;
Its optical fiber repeater comprises Optical Fiber Interface Board and high power amplifier, radio-frequency front-end and the low noise amplifier with base-station interface;
One optical fiber, connect described base station and described optical fiber repeater, its transmission of analogue signal, be used for the service-data oriented of clock signal, control signal and TDD system of system passed to described optical fiber repeater from described base station, and the reverse traffic data of reverse control signal and TDD system are passed to described base station from described optical fiber repeater;
Described reverse control signal comprises the synchronous control signal of the preceding oppositely timesharing of control amplification, the control signal and the signal of communication of measurement time delay.
5, a kind of device that is applied to realize in the time division duplex synchro system flexible networking, it is that a base station adds one or more active indoor cladding systems, wherein,
Its base station comprises baseband portion and radio frequency part, and described baseband portion comprises Base-Band Processing and control section, and described radio frequency part comprises base station transceiver, high power amplifier, radio-frequency front-end and low noise amplifier;
Its active indoor cladding system comprises master unit and a plurality of far-end unit;
Be connected oppositely the timesharing control signal of amplifying, control signal and the signal of communication of measuring time delay before the service signal of transmission TDD system and the control between described base station and the described active indoor cladding system between described base station and the described active indoor covering by optical fiber or cable.
6, device according to claim 5 is characterized in that, described base station is zoomed out the station by a repeater or a radio frequency and substituted.
7, a kind of method that is applied to realize in the time division duplex synchro system flexible networking, it is applied to, and the base station adds radio frequency extension apparatus or the base station adds optical fiber repeater or the base station adds active indoor cladding system, and this method may further comprise the steps:
A) signal that will measure time delay passes to radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by optical fiber from the base station, after receiving the delay time signal that records, radio frequency extension apparatus or optical fiber repeater or active indoor cladding system at once this signal is returned to described base station, time delay is measured according to the signal that this returns in described base station, and being described base stations with the time delay measured divided by 2 zooms out or the time delay of described optical fiber repeater or active indoor cladding system to described radio frequency;
B) add the time delay of the above base station in the lead of described base station to radio frequency extension apparatus or optical fiber repeater or active indoor cladding system;
C) in this base station, control the transmitting power of radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by the signal of communication in the described optical fiber;
D) synchronous control signal that preceding reverse timesharing is amplified in described base station side passes to described radio frequency extension apparatus or optical fiber repeater or active indoor cladding system by described optical fiber, and then the preceding sign-changing amplifier timesharing of the said apparatus of controlling is amplified.
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