CN1169802A

CN1169802A - Self-adjusting radio frequency transponders for wireless telephone systems

Info

Publication number: CN1169802A
Application number: CN 95196796
Authority: CN
Inventors: A·比斯利
Original assignee: PCS Wireless Inc
Current assignee: Allen Telecom LLC
Priority date: 1994-10-24
Filing date: 1995-10-20
Publication date: 1998-01-07

Abstract

Radio frequency repeaters that exchange transmit and receive signals between handsets and base stations of a wireless telephone system automatically compensate for attenuation losses. The radio frequency repeater includes first and second radio frequency repeater sections connected by a signal conduit, the first section interfacing with a base station, with a signal level detector for detecting a level of a transmitted signal, a microprocessor controller for quantizing and encoding the level detected by the level detector, and a modulator for modulating the signal level data and for supplying the modulated signal level data to the signal conduit. The second part has a demodulator for demodulating signal level data, an amplifier for amplifying the transmit signal, a signal level detector for detecting the level of the transmit signal amplified by the amplifier, and a microprocessor controller for comparing the demodulated signal level data with the amplified signal level and adjusting the amplifier accordingly to counteract attenuation of the transmit signal and the receive signal in the signal conduit.

Description

The self-adjusting radio-frequency (RF) repeater that is used for radio telephone system

Technical field

The present invention relates to be used for the transponder of radio telephone system, more particularly, is the transponder that is used at this system link base station and mobile wireless mobile phone, and it is applicable to time division duplex (TDD) signal and Frequency Division Duplexing (FDD) (FDD) signal.

The present invention can be used in and adopt signal pipe line (for example combination of coaxial cable, optical cable, microwave relay link, infrared link, catv line or above two or more circuits) with in the radio telephone system that links one group of radio-frequency (RF) repeater unit (for example Microcell expander) and base station.

Background technology

The base station is used to make switched telephone and radiofrequency signal interfaces, that is to say that the base station is to the radiotelephony network emission with from the radiotelephony network received RF signal.Voice link when a plurality of the net generally can be supported in the base station.

This base station has emission of radio frequency signals and receiving system and control device, and can be connected with one or more radio-frequency (RF) repeater by coaxial cable or other signal pipe line, the latter and mobile phone carry out interface, just broadcast transmitting to wireless phone from the base station with the wireless signal form, also receive wireless signal, and they are delivered to the base station from mobile phone.Therefore, radio-frequency (RF) repeater can be used for enlarging the active service zone of a base station.

Be suitable under many circumstances this radio-frequency (RF) repeater is made the device that two radio-frequency (RF) repeater part or unit constitute, just with the first of base-station interface or base station expander and with the second portion or the Microcell expander of handset port.These two parts very long distance of in fact can being separated by, for example several kilometers, and be connected by a signal pipe line such as coaxial cable or optical cable form.

In fact, the second portion of radio-frequency (RF) repeater or mobile phone part usually is several this handset ports that are placed in the different location, and they are connected to first or the base-station interface part jointly.So just having obtained making single base station is the radio-frequency (RF) repeater of several different locations service.

A problem of existing radio-frequency (RF) repeater technology is to provide the timing and level adjustment information relevant with its ad-hoc location in the signal pipe line net to the radio-frequency (RF) repeater second portion.For example, if the radio-frequency (RF) repeater second portion links to each other with its first by 100 meters coaxial cables, then its signal level of receiving has been passed through the decay of 100 meters coaxial cables, but the loss factor on this coaxial cable length will be different from the situation that another radio-frequency (RF) repeater second portion of connecting by 200 meters coaxial cables runs into greatly.In order to launch correct signal level, need to determine the specific separately loss factor of each radio-frequency (RF) repeater second portion, and it is compensated.

This problem can solve with following several diverse ways: can manually adjust the gain of each radio-frequency (RF) repeater second portion 1..In a big net, this method is also inadvisable, and no matter under which kind of situation, its efficient is all very low, unless because known radio frequency inserts loss, when existing one group to transmit, be difficult to be provided with the transmitting power of handset port.

In addition, when using cable television network as signal pipe line, the loss of user's tap and separator has constituted the part of whole radio frequency loss.Because the loss relevant with this class device is created in the user within doors usually, therefore be not easy to determine them from the open air.

Required gain also can change as the function of time, temperature or the like.2. can insert pilot signal in radio-frequency (RF) repeater first, to carry out traditional automatic electric-level control.This method provides a kind of general solution route, but usually is out of favour, because the insertion of pilot signal has increased the probability of launching spurious signal from radio-frequency (RF) repeater.If this is that then its frequency must be near radio frequency signal frequency because the loss of pilot signal on signal pipe line is identical with radiofrequency signal.

In some signal pipe line (for example cable television network), for the frequency band needs that obtain suitable pilot signal increase complexity.3. can use base station radio-frequency to transmit, set up a traditional automatic electric-level control system on this basis as pilot signal.This in some cases method when particularly radiofrequency signal meets single carrier time division multiplexing access (TDMA) form, but is to use other form of great use, and when for example multicarrier TDMA or frequency division multiplexing inserted (TDMA), this method just had been not suitable for very much.4. some radio frequency signaling protocol (for example CT one 2 plus) has control and the signaling channel (CSC) or the similar beacon that can be used as reference level.But CSC defines for this purposes.They may not exist during a voice link, and perhaps controling environment at adaptive power down may be to use the mode that does not conform to change level with them as reference level.

In above example, this problem is discussed with regard to transmitted power level.Also there is identical problem in received power level.If each radio-frequency (RF) repeater second portion is by signal pipe line connection RX path gain that record, that turn back to the base station is identical separately, the second portion work of this group radio-frequency (RF) repeater gets best.

Summary of the invention

Therefore an object of the present invention is to provide a kind of be used to link base station and wireless phone, improved New-type radio-frequency transponder, adjust the signal level that transmits and receives of radio-frequency (RF) repeater therein, insert loss with the radio frequency on the signal pipe line between the base-station interface part that compensates its handset port part and this wireless repeater.

The invention provides a kind of radio-frequency (RF) repeater that is used for linking radio telephone system base station and mobile phone, it comprises the first radio-frequency (RF) repeater part with base station chaining, to wireless phone emission wireless signal with receive from second radio-frequency (RF) repeater part of the wireless signal of wireless phone and be connected first and second radio-frequency (RF) repeater signal pipe line partly.

First radio-frequency (RF) repeater partly comprises a signal level detecter that is used to measure from the transmit signal power of base station.To from the measurement result of the radio-frequency emission power of base station in first radio-frequency (RF) repeater partly through quantizing, export on the control channel that is used for for example 10.7Mhz that first and second radio-frequency (RF) repeater partly communicate by letter as data then.Because control channel is not to use as pilot signal in essence, it can be a plurality of octaves of radiofrequency signal, therefore can not produce spurious emissions or other difficulty.

The base station has inner level control usually, it is hereby ensured that the mode with each carrier wave provides a known output level.Should be pointed out that multicarrier TDMA base station and FDMA base station change current carrier number according to the demand of speech business.Therefore the effective power output (each single carrier power sum just) from the base station can change in this system, makes radiofrequency signal be not suitable for use in pilot signal.

Second radio-frequency (RF) repeater part is carried out demodulation to control channel, recovers radio frequency level information.Relatively this information is exported with the signal level detecter that is positioned at second radio-frequency (RF) repeater part then.The signal level adjuster of second radio-frequency (RF) repeater part is adjusted according to comparative result, so that the transmission signal level of second radio-frequency (RF) repeater part is brought up on the predetermined ratio of the first radio-frequency (RF) repeater part transmission signal level.Although the effective radio frequency level from the base station in multicarrier TDMA and the FDMA system will change, second radio-frequency (RF) repeater part still can correctly be adjusted himself level.

By partly using predefined skew, can obtain the RX path gain by the transmission path gain information in second radio-frequency (RF) repeater.

For the TDD system, the transmission path gain is identical with the RX path gain with regard to the non-heterodyne system signal transmission on the signal pipe line, and therefore second radio-frequency (RF) repeater part can use this gain adjusting method to be used to transmit and receive the path gain adjustment simultaneously.

For some TDD system (for example using the CT-2 Plus of TDD-FDMA technology or the DECT of use TDD-TDMA technology), the base station provides clocklike, is in certain level and by the RF pulse string (for example CSC channel in the CT-2 Plus system or the beacon signal in the DECT system) of certain rule, thereby makes first radio-frequency (RF) repeater clearly discern these pulse trains.In this case, can be from order to derive the send-receive timing relationship the signal level detecter that partly carries out level measurement in first radio-frequency (RF) repeater.

For the TDD system, also can provide main timing information.

The accompanying drawing summary

From the following description of embodiment being carried out with reference to accompanying drawing, those skilled in the art will more clearly understand the present invention.These accompanying drawings have:

Fig. 1 represents the block diagram of a radio telephone system;

Fig. 2 represents the base station expander block diagram of pie graph 1 a telephone system part;

Fig. 3 represents the Microcell expander block diagram of pie graph 1 a telephone system part;

Fig. 4 a and 4b represent pie graph 3 Microcell expanders (when the supporting the TDD signal) amplifier of a part and the change over switch of two kinds of different switching modes;

Fig. 5 represents a kind of improvement to Fig. 1 telephone system;

Fig. 6 represents a kind of improvement to Fig. 3 Microcell expander that is used for Frequency Division Multiplexing system;

Fig. 7 represents the amplifier block diagram of pie graph 6 Microcell expander parts.

All the other modes are described

Fig. 1 represents a telephone system, it comprises the base station 10 that is used for public switched telephone network (not marking) interfaces, more particularly, the base station receives the baseband transmit signals from public switched telephone network, sends aspect with time division duplex (TDD) or Frequency Division Duplexing (FDD) (FDD) again and exports them; Also in the future convert the baseband signal that is sent to public switched telephone network in addition to TDD or FDD received signal.This technically base station is well-known, and is therefore not for a more detailed description here.

Base station 10 links to each other with a radio-frequency (RF) repeater, in an embodiment of the present invention, the latter comprises the first radio-frequency (RF) repeater part of base station expander (BEX) form, it partly links to each other with second radio-frequency (RF) repeater of Microcell expander (MEX) 18 and 19 forms by the signal pipe line of coaxial cable 14 and 16 forms, and the latter has the antenna 20 that is used for transmitting and receiving with the exchange of wireless signal form with mobile wireless mobile phone 22 signal.

The advantage of above-mentioned radio-frequency (RF) repeater is, if mobile phone 22 is positioned at the area of coverage of Microcell expander 18 or 19, only need a base station 10 and mobile phone 22 exchanges transmit and receive signal, therefore two Microcell expanders 18 and 19 use have enlarged effective overlay area of base station 10.For a person skilled in the art, obviously know that this telephone system is not limited to only use two Microcell

expanders

18 and 19, it can comprise a plurality of Microcell expanders of its covering area overlapping, to form the roaming passage that a mobile phone 22 can be roamed when communicating by letter with base station 10.

But, because coaxial cable 14 is different with 16 length, through coaxial cable 14 and 16 and the suffered decay and inequality that transmits of base station expander 12 and Microcell expander 18,19 decay, corresponding different signal level loss between base station expander 12 and Microcell expander 18 and 19.Insert radio-frequency separator to form the Microcell expander subnet that for example breaks away from coaxial cable 16, can aggravate this asymmetric on the attenuation loss.Equally, received signal is sent to base station 10 from antenna 20 and also can be subjected to different decay.As described below, the invention provides the device that these loss of signal are compensated.

Below with reference to the Fig. 2 that illustrates in greater detail base station expander 12, the joint 24 that links to each other with base station 10 links to each other with separator 32 with second capacitance 30 by capacitance 26, high pass filter 28, and separator 32 has two coaxial fittings 34 that are used to connect coaxial cable 14 and 16.

For example, when telephone system is carried out under the situation of work according to CT-2 PLUS standard (TDD-FDMA), the base station will be exported 1 millisecond with 944MHz and be transmitted, and receive 1 millisecond of received signal with 944MHz again.The transmission signal level of base station 10 is higher usually, 10mW for example, and the received signal power level is lower usually, for example 1nW.

Base station expander 12 also has a power input line 36 that connects AC power (not marking) and power supply 38, and power supply 38 is by heart yearn output direct current or the low frequency ac of separator 32 to coaxial cable 34, to drive far-end Microcell expander 18 and 19.

Be connected to a directional coupler 40 between capacitance 26 and high pass filter 28, it is sent to a part of base station transmit signals first signal level detecter 42 that comprises a standard diode testing circuit.As long as 1 millisecond of signal of base station, the signal level on the detector 42 just produces 1 millisecond of pulse, and pulse height is directly proportional with the amplitude of transmitting from base station 10.This pulse is fed to microprocessor controller 44, as following more detailed description, microprocessor controller quantizes pulse height and is encoded into the signal level data of representing pulse height in the data flow, these data by frequency shift keying (FSK) modulators modulate to the 10.7MHz subcarrier.The modulated signal level data arrives the directional coupler 50 that is connected between high pass filter 28 and the capacitance 30 through low pass filter 48 then, to deliver to Microcell expander 18 and 19 by coaxial cable 14 and 16.In embodiments of the present invention, microprocessor controller 44 is realized by the Motorala 68HCll microprocessor that has analogue-digital converter in the chip.

The directivity that should be understood that directional coupler 40 helps detecting from the transmitting of base station 10, and is unfavorable for detecting the received signal from mobile phone 22.This directivity adds the difference that transmits and receives signal, makes microprocessor controller 44 be easy to distinguish and transmits and received signal.Owing to can identify transmit signal pulse and received pulse, microprocessor controller 44 can utilize level detector 42 to be identified for the synchronously required emission/reception of second radio-frequency (RF) repeater part regularly.This derivation transmitting-receiving method regularly is only just useful when mobile phone is set up signal link (that is to say the effective transmitted pulse that detects from the base station) with the base station.It is not suitable for there is not the base station usually-situation of mobile phone link.

When not having this link, can use CSC or beacon signal to provide regularly from the base station.Therefore, for example in the CT-2 plus agreement, when not existing base station-mobile phone to link, guarantee to have standard radio frequency burst signal (CSC) from the base station.Therefore, for CT-2plus, when using, the timing that CSC obtains during voice connect to provide whole emissions to receive regularly between the apparition at all signals.

Microprocessor controller 44 is encoded to the send-receive timing information in the fsk data stream.

Represented Microcell expander 18 in Fig. 3 block diagram in more detail, it is used to adopt under the TDD mode of CT-2 plus agreement works, and should know that Microcell expander 18 and 19 is identical each other.

As shown in Figure 3, Microcell expander 18 input that has coaxial fitting 52 forms is connected with coaxial cable 14.Coaxial fitting 52 is connected with band (wide being subjected to) limit TDD amplifier 62 inputs by capacitance 54, directional coupler 56, high pass filter 58 and variable attenuator 60.As described below, variable attenuator 60 and amplifier 62 constitute adjusts the signal level adjuster that transmits and receives signal level.The output of band limit TDD amplifier 62 is received on the antenna 20 by the output of directional coupler 64 and Microcell expander 18.

Coaxial fitting 52 also is connected with dc switch pressurizer 64, and the latter is output as that all electronic circuits provide direct current power among Fig. 3.

Directional coupler 56 is sent to 10.7MHz FSK demodulator 68 from the input signal of coaxial cable 14 via being suitable for most the low pass filter 66 that the 10.7MHz signal passes through with a part, and signal level data and the send-receive synchrodata that is provided by base station expander 12 as mentioned above is provided the demodulator output packet.

The part output of band limit TDD amplifier 62 is delivered to second level detector 70 by directional coupler 64, and the latter detects the emitted signal power level that is added to after the amplification on the antenna 20, and this level is offered the control device of microprocessor controller 72 forms.

Level detector 70 is by realizing with the similar circuit of Fig. 2 level detector, i.e. the standard diode testing circuit.This usually can reduce the constraint of temperature, tolerance and the linearity, because use identical level detector 70 and 42 generally can eliminate these distortions.

Output in the microprocessor controller 72 with from the signal level data of demodulator 68 and to compare from the quantization level of level detector 70, to determine the poor of expander 12 places, base station and Microcell expander 18 place's transmission signal level, 82 pairs of variable attenuators of microprocessor controller 60 are done corresponding the adjustment, keep certain specific ratio, for example 1: 1 so that deliver to the transmission signal level of antenna 20 after amplifying with the transmission signal level that records by Fig. 2 level detector 42.

Therefore the Microcell expander will be adjusted its output, for example make the signal level at antenna 20 places equal the signal level that export base station 10 substantially.The transmission signal level at Microcell expander 19 antennas 20 places also is the same.

Directional coupler 64 is more conducive to transmit signal power is sent to power detector 70, and is unfavorable for transmitting received signal power.

Below with reference to Fig. 4 a and 4b, they have represented to comprise pair of

series amplifier

72 and 74 in more detail, and divide bilateral amplifier 62 in limited time by the band that band limiting filter 76 connects between amplifier 72 and 74.The input of the output of amplifier 74 and amplifier 72 with usually be connected by the corresponding end of the change over switch of code name 78 expressions.Antenna 20 links to each other with the other two ends of change over switch 78 with the lead 80 that is extended out by variable attenuator 60.

Change over switch 78 has two kinds of transition statuses.Shown in Fig. 4 a, at first kind of transition status, just in the accepting state of received signal from mobile phone 22 by antenna 20 receptions, change over switch 78 connects the input of antenna 20 and amplifier 72, the input and the variable attenuator 60 that also connect amplifier 78, make received signal be amplified by

amplifier

72 and 74, variable attenuator 60 ride gains are to offset the decay between antenna 20 and the base station.

In second kind of transition status of change over switch 78, shown in Fig. 4 b, link to each other with amplifier 72 inputs, and amplifier 74 is exported and is linked to each other with antenna 20 from the lead 80 of variable attenuator 60.Therefore, in this emission state, transmit after variable attenuator 60 decay, be exaggerated

device

72 and 74 and amplify, to offset the loss of signal between the base station 10 and antenna 20 as mentioned above.

The control output control that the variation of change over switch 78 states is regularly produced from transmitting and receiving the signal gained by microprocessor controller 72 bases.

Therefore,

amplifier

72 and 74 both had been used for the amplifying emission signal, was used to amplify received signal again, transmitted and received gain and equated.Amplifier shown in Fig. 4 A and the 4B and switching device thereby can make Microcell expander 18 compensation 10 losses and of transmitting automatically from the base station from antenna 20 received signal loss of 10 to the base station to antenna 20.

Fig. 5 represents a kind of improvement to telephone system shown in Figure 1.More particularly, in improvement shown in Figure 5, be connected between base station expander 12 and the Microcell expander 19 with Microcell expander 18 and the 19 similar amplifier units 90 of connecting, be used to amplify the signal that transmits and receives, and the signal forwarding of pressing after original situation will be amplified is given Microcell expander 19 or base station expander 12 by coaxial cable 16.

Series connection amplifier unit 90 and Microcell expander shown in Figure 3 18 are similar, have just saved antenna 20, and have replaced coaxial fitting 91 (Fig. 3) to link to each other with the coaxial cable 16A (Fig. 5) that extends to Microcell expander 19.This device allows Microcell expander 19 to link to each other with the base station by the coaxial cable that reality is longer so loss is bigger.

As shown in Figure 3, have the bypass lead 92 connection

coaxial fittings

52 and 91 of switch 94, the input and output of the amplifier unit of promptly connecting.Switch 94 closures are delivered to joint 91 to 107MHz subcarrier and power by joint 52, thereby arrive Microcell expander 19.

When using this cascaded structure, the output level of operated by rotary motion series connection amplifier unit 90 is preferably lower than common launching electrical level.So just can be fully control cascade intermodulation budget (intermodulation budget) to series connection amplifier unit 90 and line end Microcell expander by the line end performance.Therefore be in operation, the closure of microcontroller 72 sense switches 94 is also adjusted variable attenuator 60, to guarantee that the signal level that joint 91 places record generally is 1/10th of base station 10 output signal levels.The series connection transmitting gain equals the receiving gain of connecting.

As mentioned above, transmitting and receiving signal is the time division duplex aspect.But be easy to above-mentioned Fig. 1,2 become the Frequency Division Duplexing (FDD) mode with 3 plant modification.

For this reason, as shown in Figure 6, the band of Fig. 3 limit TDD amplifier 62 is replaced by band limit FDD amplifier 100.The other parts of Microcell expander shown in Figure 6 are identical with Fig. 3, therefore represent with same code name, do not remake description here.

Understand the band limit FDD amplifier 100 of Fig. 6 among Fig. 7 in more detail.

As shown in Figure 7, lead 60 from variable attenuator 60 links to each other with duplexer 104, this duplexer is delivered to emission amplifier 108 transmitting through band limiting filter 106, and receiving received signal from band limiting filter 110 and receiving signal amplifier 112, received signal arrives variable attenuators 60 through lead 102 then.

The output of amplifier 108 of transmitting links to each other with another duplexer 114 with filter 110, and this duplexer links to each other with antenna 20 by directional coupler 64.

If necessary,

duplexer

104 and 114 can use radio-frequency separator/combiner to replace.

In the FDD configuration, emission amplifier 108 and filter 106 are in fact completely different with reception amplifier 112 and filter 110.Because transmission signal level exceeds a plurality of orders of magnitude than received signal level amplitude usually, microprocessor controller 72 uses power detector 42 (Fig. 2) and 70 (Fig. 3) can be easy to distinguish transmitted power level and received signal power level.If known Fig. 7 reception amplifier 112 is with respect to the gain of emission amplifier 108, according to the signal level adjustment of the gain that is used to transmit also can control well and definite antenna 20 and base station 10 between RX path gain.

The operation of microprocessor controller 44 may further comprise the steps: 1. the level of measuring self-detector 42.2. if the corresponding signal greater than 1/10th milliwatts of this level thinks that it represents a transmitted pulse.

If this level, thinks that it represents a received pulse less than 1/10th milliwatts.3., this level data is delivered to FSK modulator 46, so that be transferred to all second radio-frequency (RF) repeater parts if transmitted pulse exists.

If received pulse exists, partly send information " received pulse existence " to all second radio-frequency (RF) repeater.4. if transmitted pulse exists, but preceding one-shot measurement indication received pulse is labeled as this measurement result " initial transmitted pulse ".5. should " initial transmitted pulse " data deliver to FSK modulator 46, so that be transferred to all second radio-frequency (RF) repeater parts.6. repeat level measurement and (just return step 1).

In concrete CT-2 plus example, 1 millisecond of launch time and 1 millisecond of time of reception are arranged, given this when order, Fig. 3 microprocessor controller 72 usually in the following manner: 1. from fsk demodulator 68 reading of data.2. if read in data for " initial transmitted pulse ", start software counter, change over switch 78 is placed on receiving position after 1 millisecond, it is placed on transmitting site after 2 milliseconds.3., read in the level of current time from level detector 70 if data provide transmission signal level.4. if switch 94 closures (series system) will multiply by 10 by the signal level of level detector 70 records.

If switch 94 disconnects (line end mode), will multiply by 1 by the signal level of level detector 70 records.5. if the level from level detector 70 is higher than the level that reads on demodulator 68, with a very little increment of decay raising at variable attenuator 60 places.

If the level from 70 is lower than the level that reads on demodulator 68, with a very little increment of decay reduction at variable attenuator 60 places.6. repeat above-mentioned steps 1.

Attention is when beginning to power on, and these software steps may make radio-frequency (RF) repeater cisco unity malfunction in 200 or 300 milliseconds, and is just fully normal after this.In fact this not become it be a problem.

Certainly, can adopt more complicated program.For example:

Judge when " initial transmitted pulse " or launching electrical level actual value appear and before, the microprocessor controller among Fig. 3 can be averaged to measurement result repeatedly.

As what once mentioned, CT-2 plus does not provide CSC pulse train when having voice link.Comprise three 1 millisecond of pulse trains in per 72 milliseconds of the CSC.

In this case, if " initial transmitted pulse " expression in front is current to be launch time, but the level data that reads in is opposite with last result, be " received signal existence ", the microprocessor controller 72 of Fig. 2 will add the step of " the initial transmitted pulse " that produce self in step 2.

More than to microprocessor controller 72 and 44 the operation descriptions, all carry out with regard to the TDD mode.In fact can use identical software for the operation of the relevant level of FDD control, but timing controlled software can only limit to be used in the FDD-TDMA system, to select to be used for particular time-slot to certain group membership's broadcasting/reception.

Within the scope and spirit of claims, can carry out various changes to said apparatus.For example using heterodyne technology in some cases in the radio-frequency (RF) repeater of Fig. 4 or 7 is of great use.In addition, be suitable for using a variable gain amplifier to replace adjusting as mentioned above the variable attenuator and the amplifier of signal level under some situation.

Claims

One kind in radio telephone system to cell phone broadcasting transmitting and send radio-frequency (RF) repeater device from the base station from the received signal of mobile phone to the base station, comprise: with the first radio-frequency (RF) repeater part of base-station interface, be separated with first radio-frequency (RF) repeater and have antenna so that transmit and receive the second radio-frequency (RF) repeater part of signal with wireless signal form and handset switch, and the signal pipe line that connects first and second radio-frequency (RF) repeater part; It is characterized in that,

First radio-frequency (RF) repeater partly comprises first level detector of the signal level that transmits that is used to detect this first radio-frequency (RF) repeater part and is used for being modulated on the carrier wave to be transferred to second radio-frequency (RF) repeater modulator partly by signal pipe line surveying signal level; Second radio-frequency (RF) repeater partly comprises: the signal level adjuster that is used for the amplifying emission signal, be used to detect second level detector by the transmission signal level after the amplification of signal level adjuster, be used for the demodulator of demodulation from the signal level of first radio-frequency (RF) repeater part, comparison restituted signal level and second level detector institute detection signal level controller to provide control to export to the signal level adjuster is provided, and is used for antenna to the mobile phone broadcast transmission signal; Described signal level adjuster changes its gain according to control output, so that second level detector institute detection signal level is brought up on the predetermined ratio of first level that level detector is detected.
2. radio-frequency (RF) repeater device as claimed in claim 1 is characterized in that the signal level adjuster comprises one alternately transmitting and received signal is linked change over switch on the signal level adjuster, and to transmit and receive the gain that signal amplifies identical thereby make.
3. radio-frequency (RF) repeater device as claimed in claim 1, it is characterized in that first radio-frequency (RF) repeater partly comprises is used for processor that first level detector output is quantized and encodes, and be used for obtaining the device that transmits with the received signal timing from first level detector, control this modulator by this processor.
4. radio-frequency (RF) repeater device as claimed in claim 1, it is characterized in that first radio-frequency (RF) repeater partly comprises is used for transmitting and received signal is coupled to the coupler of first level detector, this coupler is made up of a directional coupler, it is beneficial to most is coupled on first level detector transmitting, and transmits and received signal to help processor to distinguish.
5. radio-frequency (RF) repeater device as claimed in claim 1 is characterized in that controller comprises and is used for when not having the link of base station-cell phone obtaining device regularly from control and signaling channel or from the beacon signal of base station.
6. radio-frequency (RF) repeater device as claimed in claim 1, it is characterized in that, the signal level adjuster comprises respectively and to transmit and receive transition status alternately transmitting and received signal is linked a change over switch on the signal level adjuster, thereby the gain that transmits and receives the signal amplification is identical, and controller comprises the device that signal timing changes the change over switch state that transmits and receives according to it.
7. radio-frequency (RF) repeater device as claimed in claim 1, it is characterized in that, also comprise a series connection amplifier unit that partly is connected by signal pipe line and the base station and second radio-frequency (RF) repeater, this series connection amplifier comprises another signal level adjuster that is used for the amplifying emission signal, be used to detect another level detector of the signal level after this signal level adjuster amplifies, be used for the demodulator of demodulation from the first radio-frequency (RF) repeater part signal level data, be used for comparison restituted signal level data and this another level detector measured signal level so that for this another signal level adjuster provides another another controller that control is exported, the gain of this another signal level adjuster changes so that the signal level that this another level detector detected is brought up on the predetermined ratio of first level that level detector detects according to this another control output.
8. radio-frequency (RF) repeater device as claimed in claim 7, it is characterized in that, this another signal level adjuster comprises being used for alternately connecting and transmits and the change over switch of received signal to this another signal level adjuster, and to transmit and receive the gain that signal amplifies identical thereby make.
9. radio-frequency (RF) repeater device as claimed in claim 6, the amplifier that it is characterized in that connecting have an input, output, one to be used for power and carrier wave are connected to from input the switch of output the bypass lead channels between the input and output and one in the bypass lead channels.
10. radio-frequency (RF) repeater device as claimed in claim 1, it is characterized in that second radio-frequency (RF) repeater partly comprises the demodulator that is used for the restituted signal level data, the amplifier that is used for amplifying emission and received signal, transmission signal level after this signal level detecter detecting amplifier amplifies and from the received signal level of antenna, variable attenuator is connected between signal pipe line and the amplifier, this controller comprises that one is used for comparison restituted signal level data and secondary signal transmission signal level that level detector is surveyed, and correspondingly adjust attenuator and transmit and receive the microprocessor controller of the decay of signal on signal pipe line with counteracting, this second microprocessor controller is connected with amplifier to provide from the timing that transmits and receives signal to it.
11. radio-frequency (RF) repeater device as claimed in claim 10, it is characterized in that amplifier has an input, an output and a change over switch, this change over switch is by being controlled from the timing of second microprocessor controller, so that alternately connect this output to this antenna after amplifying with broadcasting transmit be connected this antenna to this input amplifying received signal, transmit and received signal has been passed through same amplification thereby make.
12. radio-frequency (RF) repeater device as claimed in claim 9, it is characterized in that, be used to connect and transmit and receive the directional coupler of signal to first and second level detectors, it is configured to help be coupled to first and second level detectors transmitting, transmit and received signal to help first and second microprocessor controllers to distinguish, so that from transmit, obtain timing information.
13. one kind in radio telephone system to cell phone broadcasting transmitting and send method from the base station from the received signal of mobile phone to the base station, use comprises the radio-frequency (RF) repeater with the lower part: with the first radio-frequency (RF) repeater part of base-station interface, the second radio-frequency (RF) repeater part of partly separating with first radio-frequency (RF) repeater, this second radio-frequency (RF) repeater is partly with the antenna that transmits and receives signal with wireless signal form and handset switch, and connect first radio-frequency (RF) repeater part and second radio-frequency (RF) repeater signal pipe line partly, it is characterized in that;

Partly detect transmission signal level in first radio-frequency (RF) repeater, institute's detection signal level is modulated on the carrier wave to be transferred to the second radio-frequency (RF) repeater part by signal pipe line, at the second radio-frequency (RF) repeater part amplifying emission signal, detect the transmission signal level after amplifying, demodulation is from the signal level of first radio-frequency (RF) repeater part, and relatively the restituted signal level and the second radio-frequency (RF) repeater part institute detection signal level are to provide the control output of control amplification process and transmitting after mobile phone broadcasting is amplified.
14. as method as described in the claim 13, it is characterized in that, alternately connect transmit and received signal to amplifier be exaggerated with identical gain so that transmit and receive signal.
15., it is characterized in that, partly obtain the timing that transmits and receives signal in first radio-frequency (RF) repeater, so that make first and second radio-frequency (RF) repeater part synchronously as method as described in the claim 13.
16. as method as described in the claim 15, it is characterized in that, first radio-frequency (RF) repeater partly use directional coupler so that advantageously coupling transmit, transmit and received signal thereby distinguish.
17. as method as described in the claim 13, it is characterized in that, when having base station-cell phone link, do not obtain regularly from control and signaling channel or from the beacon signal of base station.
18. as method as described in the claim 13, it is characterized in that, according to the first radio-frequency (RF) repeater part institute detection signal level amplifying emission and received signal on the position between first and second radio-frequency (RF) repeater part.