CN2315738Y

CN2315738Y - Radio fixed station

Info

Publication number: CN2315738Y
Application number: CN97246042U
Authority: CN
Inventors: 李吉林; 周旭东; 谭志宏; 李承军
Original assignee: Shenzhen Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 1997-11-24
Filing date: 1997-11-24
Publication date: 1999-04-21
Anticipated expiration: 2007-11-24

Abstract

The utility model relates to a fixed station for single user of a wireless access system, which comprises an external power source (101), a host box (102) and a feeding system (103), wherein the host box (102) comprises a duplexer (104) and an SU main board (105), the SU main board comprises radio frequency and baseband processing. The utility model adopts the same frequency ranges of 450.5MHz and 460.5MHz to receive and transmit, and effectively avoids the disturbance of the frequency range of a BP machine, etc. The performance of the utility model is improved by additionally selecting appropriate components, the aspects of indexes of receiving sensitivity, adjacent channel selectivity, intermodulation rejection radio, etc. obtain satisfactory result.

Description

Radio fixed station

The utility model relates to wireless access system, relates more specifically to a kind of terminal equipment-radio fixed station of wireless access system.

As everyone knows, in the vast rural area of China, the mountain area, the area that telephone is not laid as yet or is difficult to lay, wireless access will become and improve a kind of effective of these district telephone popularity rates, means efficiently, and radio fixed station is a kind of terminal of wireless access system, as shown in Figure 1, fixed station (SU) is by antenna and wireless base station (BS) contact, the base station is connected into public telephone network (PSTN) by base station controller (BSC) and remote subscriber module (RSA) again, so make it not only have the wireless access flexibility of travelling carriage but also possess advantages such as telephone tonequality is better, so enjoy the rural area, users' such as mountain area parent looks at.Yet existing fixed station all waits further improvement at the speed of continuing, call reliability, billing accuracy, energy-conservation and aspect such as reduce cost.

Therefore, the purpose of this utility model promptly is the problems referred to above that exist at prior art, provides a kind of and has reduced cost, the speed that continues is fast, call reliability is high, the radio fixed station that speech quality is good.

For reaching above-mentioned purpose, the utility model radio fixed station mainly comprise be used to finish wireless and wired, call proceeding process between wireless and wireless, the SU mainboard of fully transparent two wires telephone service is provided to two wires phone port, be used to prevent to get rid of the duplexer of emission, the outside feed power supply that connects the antenna feeder of exterior antenna and described duplexer and give described mainboard internal electric source power supply to the interference effect of reception.

Described mainboard comprises the radio circuit that is used to set up on-air radio link between the base station and by the various logic that is used to control fixed station, call treatment, signaling is also sent instruction for signaling on the control radio circuit with to the various operations of two wires telephone circuit after setting up the logic control circuit of the conversation between Wireless/wired and wireless/wireless and being used to handle no line coordination, stores the baseband processing circuitry of significant data such as identity code.

Described radio frequency part comprises by multistage band pass filter (303,305), receive and emission phase-locked loop circuit (306,307,311,312,313), height/power amplifier (302,309), frequency mixer (304) and low pass filter (301,308) and the complete SMD receiving circuit and the radiating circuit that are used for special chip (320) composition of demodulation, be respectively applied for that signaling to the standard operation frequency range of base station receives and demodulation and emission and the speech finished with the up signaling of frequency range transmit.

It is 460.5～463.5MHz that described standard receives the operating frequency section, and described emission working frequency range is 450.5～453.5MHz.

Described demodulation chip (320) is a TA31136FN type intermediate frequency integrated circuit.

Described reception and emission phase-locked loop circuit are by field effect transistor 2SK 508 and PLL integrated circuit and a common reference frequency generator (313) composition.

Described reference frequency generator (313) is a temperature compensating crystal oscillator that frequency stability is high.

Described emission phase-locked loop circuit also comprises: a capister is to be modulated at speech or signaling-information on the locking frequency by it.

Described Base-Band Processing partly comprises: be used for the various logic control of described fixed station, call treatment, finish continuing of up call and downlink call, set up wireless and wired, the logic control circuit of a wireless and wireless conversation (401), this logic control circuit (401) are UPD78054 type microprocessor.

Described Base-Band Processing part also comprises-double-tone multi-frequency decoder (411), is used to receive the touch-tone signal that two line caps are sent here, it is translated into binary data is sent to described logic control circuit (401) and handles.

Described double-tone multi-frequency decoder is the MT8870 cake core.

Described Base-Band Processing part also comprises the path control circuit (410) that is used to control reception and sends the break-make of voice signal.

Described Base-Band Processing part comprises that also being used for finishing under the control of described logic control circuit (401) signaling data that will send here is modulated to msk signal and is sent to described radio-frequency transmissions circuit; To be sent to described logic control circuit (401) after the msk signal demodulation that receive; Realize that giving of voice signal increase the weight of and postemphasis, scramble with go scramble, compression and expansion and MSK signaling and speech processing circuit (420) by all functions of program control speech signal level.

Described MSK signaling and speech processing circuit are the AK2368 cake core.

Described Base-Band Processing part also comprises: be used to detect described reception and launch the sending and receiving letter machine lock detecting circuit (402) whether phase-locked loop circuit is in the lock state;

Be used for to two line cap feeds, ringing signal be sent to user's thick film circuit (408) of two line caps and realization dislodging machine testing;

The two wires balanced signal that is used for that two line caps are sent here converts four line unbalanced signals to, and four line unbalanced signals are converted to the two wires balanced signal and finish two/wire/four-wire converting circuit (409) of eliminating echo-signal with described user's thick film circuit (408);

Be used under described logic control circuit (401) control, producing the ringing current generator (407) that the certain amplitude ringing signal drives the phone ring;

Be used for described logic control circuit (401) control down to two line caps transmission ringing-current and with the ringing circuit of described ringing current generator synchronization action;

Be used for when high pressure appears in two line caps, play open circuit or short circuit effect, thus the over-voltage over-current protection circuit of the unlikely damage of protection components and parts;

Be used to finish conversion between CMOS level and RS-232 level and realize the RS-232 serial interface circuit (412) of communicating by letter between described logic control circuit (401) and the peripheral hardware (PC), and be used to protect various useful datas so that described logic control circuit (401) also unlikely serial EEPROM (413) of losing significant data when cutting off the power supply.

Described Base-Band Processing part also comprises: a better simply RC reset circuit (414) that is used for providing reset signal to described logic control circuit.

Described Base-Band Processing partly also comprises: be used for giving under described logic control circuit (401) control outside taximeter that the polarity inversion circuit (405) of polarity inversion signal with the control charging is provided.

Described Base-Band Processing part also comprises and is used to detect the outer power voltage state, makes described logic control circuit (401) control its indicator light circuit that sends indication (415).

Described indicator light circuit (415) comprises the operating state-standby of indication complete machine, reception and transmit status; The line under-voltage state, the indicator light of field intensity signal RSS1 search condition.

The described height of described receiving circuit is put the 3SK206 type dual-gate field-effect pipe that (302) and frequency mixer (304) are GaAs material.

The utility model has the advantages that: owing to adopt the 450MHz/460MHz frequency range, the radio wave diffraction ability is strong, is particularly suited for the Da Qu wide area and covers, and its scope can reach 20～50KM, and is not subject to the interference such as the beeper of 150MHz frequency range; Owing to adopt Common Control Channel and MSK signaling modulation technique, thereby the speed that continues is fast, it is reliable to continue, and transmission contains much information.Owing to used special-purpose baseband processing chip (AK2368) to realize voice encryption, make conversation safe and reliable, simultaneously, realize the voice companding, thereby improved voice quality, show after tested, the receiving sensitivity of the utility model fixed station≤-120dBm (12dBSINAD), adjacentchannel selectivity＞90dB, intermodulation rejection ratio＞85dB, proof the utility model fixed station performance is greatly improved, and has obtained gratifying effect.

Now be described with reference to the accompanying drawings embodiment of the present utility model, to further specify the purpose of this utility model, advantage and effect.In the accompanying drawing:

Fig. 1 is the position view of explanation the utility model fixed station SU in wireless access system:

Fig. 2 is the general structure block diagram of an embodiment of the utility model fixed station:

Fig. 3 is the radio frequency part composition frame chart in the SU mainboard shown in Figure 2;

Fig. 4 is the composition frame chart of the baseband processing circuitry in the SU mainboard shown in Figure 2;

Fig. 5 is the detailed circuit diagram of radiating portion in the radio circuit shown in Figure 3;

Fig. 6 is the detailed circuit diagram of receiving unit in the radio circuit shown in Figure 3;

Fig. 7 is the detailed circuit diagram of each several part feed shown in Figure 4 and power feed;

Fig. 8 is the detailed circuit diagram of baseband processing circuitry shown in Figure 4;

Fig. 9 is the connection layout of Fig. 5 to the each several part detailed circuit of SU mainboard shown in Figure 8;

Figure 10 is the panel schematic diagram of mainframe box shown in Fig. 2;

Same section is represented by identical or corresponding label in the accompanying drawing, and links together with the holding wire that same-sign is represented.

Referring to Fig. 2, this illustrates the general structure schematic diagram of an embodiment of the utility model.As seen from the figure, the utility model fixed name 1 comprises interconnected external power source 101, and mainframe box 102 and antenna feeder 103, mainframe box 102 comprise duplexer 104 and SU mainboard 105, and mainboard 105 mainly is made up of radio frequency and Base-Band Processing two large divisions.Antenna feeder part 103 comprises exterior antenna (not shown) and antenna feeder, and the antenna opening of duplexer 104 is connected to exterior antenna by one 50 Ω coaxial line in this example.The panel of mainframe box 102 as shown in figure 10, wherein label 113 expression supply sockets, label 114 expression telephone sockets, label 115 is the antenna feeder interface, three indicator lights 118 are represented DC power supply indication DC, channel occupancy indication RX and radio-frequency transmissions indication TX respectively, label 119 expression serial ports sockets.Referring to Fig. 3 as can be known, the radio frequency part 31 of present embodiment comprises by low pass filter 301, high-frequency amplifier 302, the first band pass filters 303, the first frequency mixers 304, with if bandpas filter 305, receive phase-locked loop 306, the receiving circuit that voltage controlled oscillator 307 is formed; By emission low pass filter 308, power amplifier 309 promotes level 310, emission phase-locked loop 311, emission voltage controlled oscillator 312 and the radiating circuit of forming with the shared temperature compensating crystal TCXO of receiving circuit; And the squelch circuit formed of the squelch detecting circuit that has by integrated demodulation chip 320 inside and peripheral sample circuit, to produce purified signal SQL, for there being carrierfree to detect use, in this example, demodulation chip 320 is the TA31136 chip.Now contrast Fig. 3 and Fig. 5, Fig. 6 illustrates the working condition of above radio frequency each several part physical circuit.For receiving unit, at first receive useful radiofrequency signal by antenna, process duplexer 104 is to get rid of the influence of emission to receiving.This useful radiofrequency signal is input to a dual gate FET and amplifies (302) through a low pass filter 301, and amplification quantity is about 12dB.Signal after the amplification again through one 5 rank band pass filter 303 with the useless radiofrequency signal outside the filtering pass band width, obtain useful spectrum signal, this useful signal and the first local oscillation signal FL carry out secondary mixing, filtering, frequency discrimination, demodulation etc. through 455KHz through first if bandpas filter 305 and the second local oscillation signal SL again after first frequency mixer 304 carries out mixing, solve audio signal Au and be fed to Base-Band Processing part 420 through the end 4 of IC320 and handle.

The first local oscillation signal FL is the key that produces first intermediate frequency herein, and the quality of local oscillation signal directly has influence on the quality that receives index, so adopted VCO307 commonly used to add the PLL306 mode.VCO307 forms free-running circuit by a field effect transistor 2SK508, the reference frequency that this frequency of oscillation is input to behind PLL306 and 12.8MHz (TCXO) frequency division compares detection, and produce a direct voltage after through a low pass filter according to low-frequency phase signal of phase place situation output, this voltage control transfiguration diode, to proofread and correct free oscillation frequency it is drawn close to locking frequency, and finally be locked on the setpoint frequency.PLL adopts MB1511 monolithic PLL chip in this example, and inside is integrated gives frequency division, phase discriminator, internal register circuit.

PLL has adopted a temperature compensating crystal oscillator TCXO 313 as benchmark frequency of oscillation 12.8MHz, and this crystal has＜the temperature frequency drift characteristic of 3PPM, stability is quite high.Make frequency stability in whole operating temperature range, reach ± 3PPM in.PLL306 can carry out frequency lock control to VCO307 according to the programming of MCU401 (Fig. 4) and the reference frequency of 12.8MHz.Demodulation chip 320 is mainly used in and carries out two mixing, the filtering of 455KHz, and frequency discrimination, demodulation, noise elimination is indicated and is carried out field intensity and detect.The output line of label 5 expression field intensity strength signal RSSI, the output line of label 3 expression purified signal SQL.

Intermediate-frequency filter 305 has adopted UMF-7086 (45.1MHz) crystal filter of UNIDEN.It has within ± 6KHZ, and (3dB) bandwidth has the suppression characteristic of 30dB on the ± 25KHZ.

Above-mentioned receiving loop is operated in 460.5～463.5MHZ scope, the consistency because of considering to produce during design, and receiving feature is adjusted to one, and (3dB) bandwidth is in the 10MHz left and right sides scope of 457.0～467.0MHz.Adopt the 3SK206 of GaAs material to put pipe and mixer tube, to obtain low noise, the transmission characteristic of high-gain as height.

For radiating portion, emission VCO312 and launch the same in PLL311 and the receiving unit is so repeat no more.Emission VCO312 output signal is amplified through promoting level 310, delivers to low pass filter 308 again and remove second harmonic after power amplifier 309 amplifies, " to reach the above power of 4W and to export duplexer 104 to.Promote level 310 in this example and adopt UPC2710T, power amplifier 309 adopts M67749H.

Figure middle-end 1 is a modulation signal MOD input/output terminal.

The figure shows the block diagram and the detailed circuit thereof of the Base-Band Processing part on the SU mainboard referring to Fig. 4 and Fig. 8.Now, describe the basic condition of its each several part circuit in detail to two figure like this.

Logic control circuit 401 is used to finish the various logic control of fixed station, call treatment is set up Wireless/wired, wireless/wireless this example of conversing has been selected the large scale integrated circuit microprocessor UPD78P054GC of NEC Corporation for use, its clock adopts external crystal-controlled oscillation 4.43MHz, this microprocessor following (being called for short MCU) inside has the ROM of 32K byte and the RAM of IK byte, thus the outside need not EPROM and RAM can meet the demands.UPD78P054GC is with 69 I/O mouths, and wherein P00 and P07 are the I mouth, has four N raceway grooves to open drain electrode I/O mouth, and these four mouths are respectively: P60, P61, P63, P64.Wherein two I/O mouths are used for realizing " high, medium and low " three grades of power controls.Should add when using these four mouths and draw resistance.UPD78P054GC also has 8 middle fractures, 8 A/D mouths and two D/A mouths, because it has abundant I/O mouth, it is very convenient that it should be used, and do not need the expansion I/O mouth just can realize huge function basically.

Peripheral storage circuit 413 is mainly used to store some important data, and such as identity code, system number, frequency parameter etc., purpose is to lose for these data are unlikely after the power down.Peripheral memory 413 is selected 24C65 for use, and its capacity is the 8K byte.24C65 is connected with uPD78P054 by serial ports.Under uPD78P054 control, can write data to 24C65 also can be from the 24C65 reading of data.Its sequential operation is described referring to thereafter Primary Component and sequential.Reset circuit is selected the RC constant circuit for use, chooses suitable R C value, guarantees enough resetting times.

Sending and receiving letter machine lock detecting circuit 402 is used to detect sending and receiving and believes whether the frequency synthesizer of machine is in the lock state.This partial circuit is finished receiver lock-in detection and sender lock-in detection by two triode RN1403 respectively as inverter in this example.When promptly collecting mail locking, export 51 pin of a CMOS low level to uPD78P054, during launch lock, output low level is to 64 pin of uPD78P054, if losing lock, then above-mentioned level is a high level.

Voltage detection circuit 403 is used to detect the outer power voltage state, this circuit carries out 1/4th sampling+13.8V voltages by two resistance in this example, the A/D mouth of sending into uPD78P054 after the sampling is 77 pin, when voltage be lower than+during 10.8V, MCU401 provides low pressure indication drive low pressure indicator light.If converse this moment, then send alerting tone prompting user to the user, when voltage was lower than limiting value+10.2V, MCU401 cut off all other power supplys, and MCU is in sleep state, returns to normally up to voltage.

Over-voltage over-current protection circuit 404 is used for when high pressure appears in two line caps in this example, thereby this circuit plays open circuit or short circuit effect protection components and parts exempt from damage.Adopt piezo-resistance 10D271K and thermistor TXP-1 in this example.Wherein two thermistors are gone here and there respectively on subscribers feeder, a piezo-resistance and on subscribers feeder, and when on any wire or two lines high pressure being arranged, protective circuit all can be protected the unlikely damage of internal circuit components and parts.

Polarity inversion circuit 405 utilizes the disconnection and the closed variation that realizes two wires terminal voltage polarity of relay.Behind callee's off-hook, under the control of MCU401, make the relay adhesive, thereby the polarity of voltage of user's line end is reversed, promptly polarity inversion signal is provided and starts outside taximeter and begin to charge to two line caps, this circuit discharges and finishes to charge after the on-hook.

Ringing circuit 406 is to utilize the disconnection of relay and adhesive to reach to user's line end to send ringing-current and stop sending the purpose of ringing-current equally.Whether it and ringing signal are finished by MCU401 control synchronously.

Ringing current generator circuit 407 is used for producing the ringing signal driving phone ringing of certain amplitude under MCU401 control, with ringing circuit 406 synchronization actions.In this example by middle power tube TIP31C, NAND gate 74LS02 and ringing-current transformer DB19F266 and peripheral circuit constitute, its working method adopts both-end push-pull type, and both-end is recommended drive signal and produced through the NOR gate buffer compartment from rear drive power tube TIP31C by two I/O mouths of MCU.After boosting, the ringing-current transformer produces required ringing signal again.

SH729D user's thick film piece that user's thick film circuit 408 adopts Shenzhen Huawei Company to produce, this thick film piece adopts the constant current source power supply mode, and the subscribers feeder feed current is 25mA.On this thick film piece two photocouplers are arranged.Be used for detecting normal off-hook and the off-hook of ring phase respectively.Direct current and ringing-current are superimposed and give the user line end during the phone ring, user's thick film circuit also provides the matching network that the echo-signal that disappears is arranged with two/wire/four-wire converting circuit simultaneously, at the receiver off-book state, see it all is balanced impedances about 600 Ω from the audio frequency transformer two ends.

Two/wire/four-wire converting circuit 409 is made of with external circuit audio frequency transformer EP13H and double operational LM358D, pass through (19) pin of sending into SH729D after one-level LM358D isolation is amplified from the two wires signal that path control circuit MC14066 electronic switch is sent here, by the inner matching network of SH729D, on the one hand signal is delivered to that audio frequency transformer is secondary to be sent to secondary user's end through audio frequency transformer, finished four line signals and hold conversion to two wires signal merchant merchant; A part of on the other hand signal is delivered to (3) pin of amplifier LM358D, exports the signal mutual superposition of (1) pin with secondary through amplifier through amplifier output (1) pin, with the elimination echo-signal.The signal of sending here from two line ends is transferred to through audio frequency transformer elementary and delivers to path control circuit MC14046 electronic switch after secondary amplifier LM358D isolates and be sent to AK2368 and carry out speech and handle, and finishes the conversion from the two wires signal to four line signals.

Path control circuit 410 mainly is the break-make control that is used for realizing receiving and sending speech channel, this example adopts the inner integrated package MC14066 that comprises four electronic switches, resistance during its conducting has only tens ohm, produces the break-make that control signal is controlled each electronic switch by MCU401.Because the MC14066 electronic switch can only pass through the interior signal of 0～VDD (power supply) scope, during application must input add mid-point voltage (+1/2VDD) so that signal pass through undistortedly.

Double-tone multi-frequency decoder circuit 411 adopts MT8870DS.MT8870DS is the special-purpose integrated package of DTMF decoder, and the dtmf signal that user's line end is sent here is translated into the tetrad number of it is believed that and is sent to logic control element and handles, and realizes that the storage of subscriber dialing is transmitted.

MSK signaling and speech treatment circuit 420 adopts the special-purpose integrated package AK2368 of AKM companies, the modulation of this chipset MSK signaling, separate be in harmonious proportion voice signal preemphasis with postemphasis, scramble with go scramble compression and expanded function in one.Its inside of while also has volume and deposits controller, and electrical speech level can flexiblely be set, and the AK2368 chip provides the interface circuit that directly is connected with MCU401, can directly operate on it with MCU401.

Indicating circuit 411 shows the operating state of complete machine, comprises holding state, receives and transmit status line under-voltage state, RSS1 search condition etc.Three indicator lights 118 shown in this circuit control based on direct control chart 10 on mainframe box 102 panels, more particularly for example the operate as normal lamp is red green indicator light, redness will be represented operate as normal, abnormal working positions such as yellow expression line under-voltage; The green indicating lamp of receiver work light, carrier wave is just being received in bright green expression on channel; The sender work light is a red led, and red bright expression has the emission carrier wave.

RS-232 serial port circuit 412 has been selected the MAX232A integrated package for use, this IC belongs to+the 5V power supply, and there is power converting circuit inside, and it comprises that two-way sends and receives, the RS-232 level that is about to receive becomes the CMOS level, the CMOS level is become the RS-232 level send.Realize communicating by letter between MCU401 and the peripheral hardware, can write the various parameters of the required setting of fixed station to MCU and EEPROM by the RS-232 serial port, as identity code, transmitting-receiving frequency etc., for fixed station, RS-232 interface mainly is used for writing sign indicating number and test usefulness, and the available single, double worker that it is finished radio frequency, each function of base band tests.

Serial EEPROM 413 is in order to preserve various useful datas, make to be unlikely after the MCU401 power down to lose some significant data, MCU401 by the I/O mouth in the mode of 12C to EEPROM reading and writing, data.

Reset circuit 414 be by power supply under the power or power-down situation, produce a reseting pulse signal, logic control unit (MCU) 401 is produced resets, reinitialize.What use now is a fairly simple RC reset circuit.

Fig. 7 shows the detailed circuit of feed 430 of each several part shown in Fig. 4 and power feed 431.Referring to Fig. 7 and Fig. 4 as can be known, each several part feed 430 shown in Figure 4 and power feed 431 comprise ± 5V power supply and-24 power supplys and sending and receiving power circuit.

Behind one+13.8V of the outside feed-in power supply 432,13.8V mainly offers transmitter module, and this part needs the electric current of nearly 2A, and 13.8V also offers ringing current generator 407, to produce the ringing-current voltage of nearly 80V.

By adopting LM2575S-ADJ module and peripheral LC filter circuit to constitute-the 24V power source generator.This power supply belongs to Switching Power Supply, and LM2575S-ADJ is pwm pulse width modulated technology and DC/DC conversion module.Its operation principle is: the voltage of output is fed back to the builtin voltage comparator and reference voltage+1.23V compares through sampling, produced the different pwm signal of pulse duration according to comparative result, the pulse duration then output voltage decline that narrows down; Pulse broadens, and output voltage rises.-24V circuit mainly is to use to outside phone feed.+ 5V power supply is produced by a 78L05, mainly gives MCU401 and the power supply of some baseband circuits, has also adopted two 78L05 to produce relay 5V power supply and transmitter module 5V driving voltage.

The 5V power supply mainly is to use to LM358, is finished by a LM79L05.

Fig. 9 shows the connection of Fig. 5 to SU mainboard each several part detailed circuit shown in Figure 8, and wherein the same-sign end should link together.

The handshaking procedure of the utility model fixed station SU is finished according to the ETS signaling and in Dedicated Control Channel.Table one and table two illustrate the signaling time-sequence of the utility model fixed station calling and called process respectively, and be existing in conjunction with this this two handshaking procedure of two tables explanation.

The master exhales handshaking procedure: after SU scans control channel, wait on control channel, BSC issues ALH (N) signaling and invites SU to send visit information.When user's off-hook, hear the dialing sound, the user dialled number by " # " after, SU sends out the request of RQST signaling and carries out call on a certain time slot, and forwarding front three telephone number, when the BSC analysis condition that continues is set up, the base station issues AHYC, require follow-up telephone number, the last SAMIS signaling additional data frames of sending out of SU is transmitted follow-up telephone number, after BSC finishes follow-up number analysis, SU is distributed traffic channel, BSC issues the GTC signaling and specifies SU to transfer on the traffic channel of appointment, when SU shifts the traffic channel success, sends out S﹠amp on traffic channel; The I signaling is confirmed, when BSC receives S﹠amp; Start channel device after the I signaling and launch, BSC sets up traffic channel, called subscriber's ring, BSC is to caller SU ring-back tone, and when called off-hook, BSC issues MAINTSET signaling SU user session and sets up, SU carries out reversed polarity after receiving the MAINTSET signaling, enters talking state then.After conversation was finished, if the on-hook of SU elder generation, then SU went up and sends out on-hook signaling MAINTOFF, and after BSC received MSINTOFF, BSC sent busy tone to the called subscriber, and BSC issues CLEAR signaling SU and transfers to control channel, and BSC will remove traffic channel this moment.Behind talk-through, as wired first on-hook, then BSC issues CLEAR signaling SU and transfers to control channel, and BSC removes traffic channel simultaneously.SU send busy tone to the user, and turns back to control channel.

SU is exhaled handshaking procedure: SU waits on control channel, when wired calling SU, the BSC condition analysis that at first continues, when the condition that continues was set up, BSC issued AHYG signaling paging SU, after SU receives the AHYC signaling, go up an ACHY and reply, after BSC receives ACKY, issue the GTC signaling SU is distributed traffic channel, after SU shifts the traffic channel success, on traffic channel, send out S﹠amp; The I signaling confirms that BSC receives S﹠amp; Behind the I, start channels transmit, SU ring this moment, BSC send ring-back tone to caller.Behind the SU off-hook, the last MAINTON signaling of sending out of SU, BSC sets up speech channel, converses.Behind the end of conversation, as the on-hook of SU elder generation, then SU goes up and sends out the MAINOFF signaling, and after BSC received MAINTOFF, BSC issued CLEAR notice SU and turns back to control channel, and BSC removes control channel.

On-hook behind the end of conversation, then BSC issues the CLEAR signaling, and removes traffic channel, and SU turns back to control channel.

Table one

Table two

Claims

1, a kind of radio fixed station that is used as the terminal of wireless access system, comprise main frame, power supply and antenna feeder is characterized in that: described main frame (102) comprises and is used to receive from the radiofrequency signal of described antenna feeder and isolates the duplexer (104) of emission influence and be used for the sending and receiving signaling and speech and being handled and the two-way SU mainboard (105) that is connected to described duplexer.

2, according to the radio fixed station of claim 1, it is characterized in that: described SU mainboard (105) comprises the radio frequency part that is used for setting up the on-air radio link between the base station of described connecting system and is used to handle the wireless demodulation signaling, and sends signaling on the described radio frequency part of commands for controlling and to the Base-Band Processing part of the various operations of two wires telephone circuit.

3, according to the radio fixed station of claim 2, it is characterized in that: described radio frequency part comprises by multistage band pass filter (303,305), receive and emission phase-locked loop circuit (306,307,311,312,313), height/power amplifier (302,309), frequency mixer (304) and low pass filter (301,308) and the receiving circuit and the radiating circuit that are used for special chip (320) composition of demodulation, be respectively applied for that signaling to the standard operation frequency range of base station receives and demodulation and emission and the speech finished with the up signaling of frequency range transmit.

4, according to the radio fixed station of claim 3, it is characterized in that: it is 460.5～463.5MHz that described standard receives the operating frequency section, and described emission working frequency range is 450.5～453.5MHz.

5, according to the radio fixed station of claim 3, it is characterized in that: described demodulation chip (320) is a TA31136FN type intermediate frequency integrated circuit.

6, according to the radio fixed station of claim 3, it is characterized in that: described reception and emission phase-locked loop circuit are by field effect transistor 2SK508 and PLL integrated circuit and a common reference frequency generator (313) composition.

7, according to the radio fixed station of claim 6, it is characterized in that: described reference frequency generator (313) is a temperature compensating crystal oscillator that frequency stability is high.

8, according to the radio fixed station of claim 7, it is characterized in that: described emission phase-locked loop circuit also comprises: a capister is to be modulated at speech or signaling-information on the locking frequency by it.

9, according to the radio fixed station of claim 2, it is characterized in that: described Base-Band Processing partly comprises: be used for the various logic control of described fixed station, call treatment, finish continuing of up call and downlink call, set up wireless and wired, the logic control circuit of a wireless and wireless conversation (401), this logic control circuit (401) are UPD78054 type microprocessor.

10, according to the radio fixed station of claim 9, it is characterized in that: described Base-Band Processing part also comprises a double-tone multifrequency translator (411), be used to receive the touch-tone signal that two line caps are sent here, it be translated into binary data be sent to described logic control circuit (401) and handle.

11, according to the radio fixed station of claim 10, it is characterized in that: described double-tone multi-frequency decoder is the MT8870 cake core.

12, according to the radio fixed station of claim 11, it is characterized in that: described Base-Band Processing part also comprises the path control circuit (410) that is used to control reception and sends the break-make of voice signal.

13, according to the radio fixed station of claim 12, it is characterized in that: described Base-Band Processing part comprises that also being used for finishing under the control of described logic control circuit (401) signaling data that will send here is modulated to msk signal and is sent to described radio-frequency transmissions circuit; Be sent to described logic control circuit (401) after the msk signal demodulation that will receive: realize that giving of voice signal increase the weight of and postemphasis, scramble with go scramble, compression and expansion and MSK signaling and speech processing circuit (420) by all functions of program control speech signal level.

14, according to the radio fixed station of claim 13, it is characterized in that: described MSK signaling and speech processing circuit are the AK2368 cake core.

15, according to the radio fixed station of claim 14, it is characterized in that: described Base-Band Processing part also comprises: be used to detect described reception and launch the sending and receiving letter machine lock detecting circuit (402) whether phase-locked loop circuit is in the lock state;

16, according to the radio fixed station of claim 15, it is characterized in that: described Base-Band Processing part also comprises: a better simply RC reset circuit (414) that is used for providing reset signal to described logic control circuit.

17, according to the radio fixed station of claim 16, it is characterized in that: described Base-Band Processing partly also comprises: be used for giving under described logic control circuit (401) control outside taximeter that the polarity inversion circuit (405) of polarity inversion signal with the control charging is provided.

18, according to the radio fixed station of claim 17, it is characterized in that: described Base-Band Processing part also comprises and is used to detect the outer power voltage state, makes described logic control circuit (401) control send the indicator light circuit (411) of indication.

19, according to the radio fixed station of claim 18, it is characterized in that: described indicator light circuit (411) comprises the operating state-standby of indication complete machine, reception and transmit status; The line under-voltage state, the indicator light of field intensity signal RSS1 search condition.

20, according to the radio fixed station of claim 3, it is characterized in that: the described height of described receiving circuit is put the 3SK206 type dual-gate field-effect pipe that (302) and frequency mixer (304) are GaAs material.