CN200956574Y

CN200956574Y - CDMA Wireless fixed terminal device capable of realizing automatic route switching

Info

Publication number: CN200956574Y
Application number: CNU2006201229339U
Authority: CN
Inventors: 魏巍; 周毅; 刘文斌; 刘文忠
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2006-08-02
Filing date: 2006-08-02
Publication date: 2007-10-03
Anticipated expiration: 2016-08-02

Abstract

The utility model is a CDMA wireless fixed terminal device which can realize the automatic routing switch; the device includes an outer shell, a CDMA connections module, a subscriber line interface circuit, a switching control circuit, and an interface circuit of the public switch telephone network. The CDMA connections module includes a CDMA base band processing unit and a CDMA radio frequency processing unit. The utility model has the advantage of that the device can provide the user with the PSTN wired and CDMA wireless access methods at the same time; when connected to the ordinary telephone, the device can realize the voice calling business respectively from two lines and realize the automatic routing switch of the lines; the use is convenient and economical.

Description

A kind of CDMA radio fixed terminal device of realizing that automatic route is switched

Technical field

The utility model relates to communication products, particularly a kind of code division multiple access (Code Division Multiple Access is hereinafter to be referred as CDMA) wireless fixed terminal device of realizing that automatic route is switched.

Background technology

Along with development of wireless communication devices and digital mobile cellular telecommunication net build perfect day by day, a kind of in recent years fixed wireless access terminal equipment has occupied certain market gradually, be widely used in numerous special occasions, as mountain area, the place (train) of flowing, public place (railway station), odd-job occasion (construction site) and modern fixing office or mobile office place.The advantage of fixed wireless access terminal is that it is not subjected to the constraint of traditional public switched telephone network (PSTN) (Public Switched TelephoneNetwork is hereinafter to be referred as PSTN) wired telephone line difficult wiring, mobility difference, is therefore developed rapidly.

The patent No. is US6668176, the day for announcing is on December 23rd, 2003, denomination of invention is in the United States Patent (USP) of wireless fixed terminal (FWT) definition, advantage and the composition of wireless fixed terminal to be introduced, wherein introduce system's composition of wireless fixed terminal, the characteristics of each part and the function that will finish, there were significant differences but its concrete technical scheme and actual effect are with the wireless fixed terminal device shown in the utility model.

Along with the raising gradually of further developing of wireless communication technology, particularly data service rate, the wireless access terminal has shown the incomparable advantage of traditional cable technology.But in the part occasion, such as the weak district and the blind area of wireless signal, the communication efficiency of wireless fixed terminal is subjected to great influence.In addition, owing to artificial custom, the more wireless telephonic Inherent advantages of PSTN telephone, better such as tonequality, be subjected to the influence of weather, peripheral accessory less, environmental protection, rate are lower etc., make people still be accustomed to the telephone terminal at an office and a PSTN circuit of family's reservation.

But the inconvenience of using wireless fixed terminal and PSTN telephone terminal can cause the user to use simultaneously, and also be uneconomic.

The utility model content

Main purpose of the present utility model is to provide the advantage separately of a kind of PSTN of giving full play to wire communication and fixed wireless access terminal, can realize the cdma wireless fixed terminal device that automatic route is switched.

The utility model comprises shell for the user provides a kind of cdma wireless fixed terminal device of realizing that automatic route is switched; The cdma communication module provides CDMA air interface and cdma wireless speech business transmission platform; Subscriber Line Interface Circuit (Subscriber Line Interface Circuit is called for short SLIC) is connected with above-mentioned cdma communication module, and the application interface of cdma wireless path is provided; Control switching circuit is connected with above-mentioned SLIC, and the switching of above-mentioned cdma wireless path and the wired path of PSTN is provided; The PSTN interface circuit is connected with above-mentioned control switching circuit, and above-mentioned PSTN is provided the application interface of wired path, and the detection line state; Above-mentioned cdma communication module comprises CDMA baseband processing unit and CDMA RF processing unit, and above-mentioned CDMA baseband processing unit is connected with above-mentioned SLIC.

Said apparatus also comprises antenna, is connected with above-mentioned cdma communication module, is arranged at the inside or the outside of above-mentioned shell.

Said apparatus is connected with telephone set, telephone set can be placed inside or outside.The said external telephone set is external ordinary telephone set.Above-mentioned case surface has interface, is used for connecting said external telephone set, PSTN line, antenna, external power source and data-interface line etc., when said apparatus is the in-built electrical phone, can not provide external phone interface.

Advantage of the present utility model is that said apparatus can simultaneously provide PSTN wired and two kinds of access waies of cdma wireless to the user, connects ordinary telephone set and can realize respectively from the voice call service of two circuits, and is easy to use and economical.

Below in conjunction with accompanying drawing, concrete enforcement of the present utility model is described in further detail.For those skilled in the art that, from the detailed description to the utility model method, above-mentioned and other purposes of the present utility model, feature and advantage will be apparent.

Description of drawings

Fig. 1 is the communication system schematic diagram of realizing according to the utility model one embodiment.

Fig. 2 is the system construction drawing of the utility model one embodiment.

Fig. 3 is the overall work flow chart of the utility model one embodiment.

Fig. 4 is the workflow diagram of the called process of conduct of the utility model one embodiment.

Fig. 5 is the workflow diagram as the caller process of the utility model one embodiment.

Embodiment

Below in conjunction with accompanying drawing concrete enforcement of the present utility model is elaborated.

Fig. 1 represents the communication system schematic diagram of realizing cdma wireless fixed terminal device one preferred embodiment that automatic route is switched by a kind of.Above-mentioned wireless fixed terminal device 11 is connected with external ordinary telephone set 17 and PSTN network 16, its connecting line uses the AB line, PSTN network 16 is connected by the AB line with wire user 15, said apparatus 11 is connected with antenna 12, finish transmitting and receiving of data by Um mouth 18, above-mentioned cdma network 13 sends to above-mentioned data CDMA user 14 or receives data from CDMA user 14.

Fig. 2 represents an a kind of preferred embodiment structural representation of realizing the cdma wireless fixed terminal device 11 that automatic route is switched.Cdma communication module 21 comprises CDMA RF processing unit 211 and CDMA baseband processing unit 212, cdma communication module 21 is connected with SLIC22 with antenna 12, SLIC22 and PSTN interface circuit 24 are connected to control switching circuit 23, PSTN interface circuit 24 is connected to the PSTN (not shown) by the AB line, and external ordinary telephone set 17 is connected to control switching circuit 23 by the AB line.

Below each module is elaborated.

1.SLIC22

SLIC22 be for external ordinary telephone set 17 provide the wireless signal access interface core circuit, external ordinary telephone set 17 can realize by this interface and cdma communication module 21 between speech business mutual.User interface SLIC22 is responsible for receiving the analog voice signal that external ordinary telephone set 17 sends under the cdma wireless communication mode of this device 11, and this voice signal is carried out the two wires change to four lines, the voice signal after the conversion is transferred to cdma communication module 21 with the form of analog or digital signal; Also can be opposite transmission direction, cdma communication module 21 be sent the analog or digital voice signal into SLIC22, delivers to external ordinary telephone set 17 through this circuit by four lines after the conversion of two lines.In addition, SLIC22 also provides functions such as feed, ring, dislodging machine testing, simulation dislodging machine for external ordinary telephone set 17, also can realize dual-tone multifrequency (Dual Tone Multiple Frequency according to actual needs, functions such as detection abbreviation DTMF), frequency shift keying (FrequencyShift Keying is called for short FSK) caller identification and various prompt tones.

2.CDMA communication module 21

Cdma communication module 21 is core circuits of cdma wireless signal communication, as the platform of cdma wireless signal transmission.Cdma communication module 21 mainly comprises CDMA baseband processing unit 212 and CDMA RF processing unit 211 two parts circuit.CDMA baseband processing unit 212 directly links to each other with SLIC22.When this device 11 uses as caller, CDMA baseband processing unit 212 is through transmitting the voice signal of external ordinary telephone set 17 with SLIC22, and this signal carried out certain processing, through the modulation of CDMA RF processing unit 211 circuit, the signal after the modulation is finished the emission of data by Um Interface 18 then.When this installs 11 equipment as called use, CDMA RF processing unit 211 circuit are finished the reception of data by Um Interface 18, and the modulation signal that receives carried out demodulation, signal after the demodulation is handled via CDMA baseband processing unit 212, deliver to SLIC22 then, send to the communication that external ordinary telephone set 17 is finished the cdma wireless signal at last.

3.PSTN interface circuit 24

PSTN interface circuit 24 is core circuits that the PSTN wire signal inserts, and is mainly used in the wired access of the PSTN that finishes fixed terminal equipment.PSTN interface circuit 24 is set up the physical channel between PSTN of Local Exchange and the external ordinary telephone set 17, finishes the transmission of PSTN wire signal by the AB line.PSTN interface circuit 24 need be finished status detection such as dislodging machine, the wired path connection of PSTN and ring to the external ordinary telephone set 17 that is connected on the PSTN of Local Exchange simultaneously, and realizes the function of simulation dislodging machine.

4. control switching circuit 23

Control switching circuit 23 is used for choosing wired access of PSIN or cdma wireless access channel, realizes the path selection in the following manner: when as called use, can differentiate the incoming call type automatically, thereby realize the automatic switchover of wired incoming call of PSTN or cdma wireless incoming call; When using as caller, the cdma wireless path can directly be breathed out, and utilizes the exhalation of the wired path of PSTN then to need to add group special key before calling number.Control switching circuit 23 needs to guarantee the correct of line status, avoids making a mistake in handoff procedure.In addition, when the user did not connect local telephone to said apparatus 11, control switching circuit 23 can automatically switch to the cdma wireless path and use; And when power supply is undesired, can automatically switch to the wired path of PSTN.

Introduce its course of work respectively by the different stages below.

1. overall workflow

As shown in Figure 3, when this device 11 connects the start of externally fed power supply, at first whether automatic inspection has the PSTN circuit to insert, if do not insert, then control switching circuit 23 is selected to be communicated with the cdma wireless path, and external ordinary telephone set interface is swung to the SLIC22 side, disconnects the wired path of PSTN simultaneously, promptly disconnect being connected of PSTN interface circuit 24 and external ordinary telephone set 17, this moment, this device 11 can use as a cdma wireless fixed terminal separately; If the PSTN circuit has inserted this device 11, then control switching circuit 23 acquiescences are selected the wired path of PSTN, and disconnection cdma wireless path, whether PSTN interface circuit 24 begins monitoring at this moment has the incoming call incoming call in the PSTN line side, and cdma communication module 21 also begins to detect whether at radio path the incoming call incoming call is arranged, whether the monitoring that while PSTN interface circuit 24 is finished external ordinary telephone set 17 dislodging machine states enters caller or incoming call process with decision.

Install under 11 powering-off states at this, control switching circuit 23 is swung to the wired path of PSTN with external ordinary telephone set interface, can't switch, and cdma communication module 21 is not worked yet.

2. called process

As shown in Figure 4, whether said apparatus 11 monitorings have the incoming call incoming call, if the incoming call incoming call is arranged, whether differentiate is that the PSTN line side has the incoming call incoming call, if there is the incoming call incoming call in the PSTN line side, this device 11 at first detects bell signal, simultaneously the dislodging machine state of external ordinary telephone set 17 is monitored, if in the regular hour, detect external ordinary telephone set 17 off-hooks then enter call mode, this moment, SLIC22 realized the simulation off-hook of cdma wireless path, forbid the CDMA wireless network incoming call, realized the interlocking of cdma wireless path and the wired path of PSTN.After conversation was finished, after PSTN interface circuit 24 detected external ordinary telephone set 17 on-hooks, SLIC22 realized the simulation on-hook, discharges the cdma wireless path, allows the CDMA wireless network incoming call.

If CDMA wireless network has the incoming call incoming call, cdma communication module 21 is at first judged type of call, if be speech business, then control switching circuit 23 is communicated with SLIC22 and external ordinary telephone set 17, produce ring, enter the cdma wireless call mode behind the receiver off-book, and control PSTN interface circuit 24 realization PSTN simulation off-hooks, forbid the wired path incoming call of PSTN; After conversation was finished, this installed 11 on-hooks 21 controls of cdma communication module, and PSTN interface circuit 24 is realized the simulation on-hook.Control switching circuit 23 disconnects the cdma wireless path, and external ordinary telephone set interface is swung to the wired path of PSTN.

3. caller process

As shown in Figure 5, behind user's off-hook, control switching circuit 23 switches to the cdma wireless circuit side with external ordinary telephone set 17 automatically, circuit send dialing tone to external ordinary telephone set 17, whether at first begin to distinguish whether circuit will be switched to the wired side of PSTN with special key according to calling number, if there is not special key, then be the CDMA caller, if special key is arranged, then switch to the wired side of PSTN.As be the CDMA caller, enter cdma wireless caller process and control the simulation off-hook that PSTN interface circuit 24 is realized the PSTN circuit.As be the PSTN caller, then control switching circuit 23 selects to be communicated with the wired path of PSTN, and disconnects the cdma wireless path, enters PSTN caller process and controls the simulation off-hook that SLIC22 realizes the cdma wireless path.No matter be which kind of caller, after finishing conversation or call failure, control the wired path of PSTN that another road is simulated on-hook and switched to acquiescence.

Realize that more than the maximum difficulty of terminal hardware design that PSTN is wired and cdma wireless inserts is the isolation processing of line status supervisory circuit to PSTN side two lines (AB line), if isolate bad, directly introducing power frequency disturbs, cause at PSTN that background noise increases under the wired and cdma wireless mode, influence communication effect, disturbance state is judged simultaneously.So directly utilize the higher device of isolation to isolate the interference signal of PSTN interface circuit 24 in fixed terminal PSTN interface circuit 24 parts.

The above is preferred embodiment of the present utility model only, is not to be used for limiting practical range of the present utility model; Every equivalence of being done according to the utility model content changes and revises, and is all contained by claim of the present utility model.

Claims

1. the CDMA radio fixed terminal device that can realize that automatic route is switched is characterized in that, comprises

Shell,

The CDMA communication module is used to provide cdma air interface and CDMA radio speech business transmission platform,

Subscriber Line Interface Circuit is connected with above-mentioned CDMA communication module, is used to provide the application interface of CDMA radio path,

Control switching circuit is connected with above-mentioned Subscriber Line Interface Circuit, is used to provide the switching of above-mentioned CDMA radio path and the wired path of public switch telephone network,

The public switch telephone network interface circuit is connected with above-mentioned control switching circuit, is used to provide the application interface of the wired path of above-mentioned public switch telephone network, and the detection line state,

Above-mentioned CDMA communication module comprises code division multiple access baseband processing unit and code division multiple access RF processing unit, and above-mentioned code division multiple access baseband processing unit links to each other with above-mentioned Subscriber Line Interface Circuit.

2. wireless fixed terminal device according to claim 1 is characterized in that said apparatus comprises antenna, is connected with above-mentioned CDMA communication module, is arranged at the inside or the outside of above-mentioned shell.

3. wireless fixed terminal device according to claim 2 is characterized in that said apparatus is connected with telephone set.

4. wireless fixed terminal device according to claim 3 is characterized in that above-mentioned case surface has interface, is used for connecting above-mentioned telephone set, antenna, external power source and data-interface line.