CN102572685A - Mobile phone detection method for post-disaster search and rescue and proprietary mobile phone - Google Patents
Mobile phone detection method for post-disaster search and rescue and proprietary mobile phone Download PDFInfo
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- CN102572685A CN102572685A CN2011104218435A CN201110421843A CN102572685A CN 102572685 A CN102572685 A CN 102572685A CN 2011104218435 A CN2011104218435 A CN 2011104218435A CN 201110421843 A CN201110421843 A CN 201110421843A CN 102572685 A CN102572685 A CN 102572685A
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Abstract
The invention discloses a mobile phone detection method for post-disaster search and rescue, and belongs to the technical field of life detection for the post-disaster search and rescue. The method comprises the following steps that: surface layer mobile phones are positioned; a plurality of proprietary mobile phones are selected from the surface layer mobile phones, and a repeater function of each proprietary mobile phone is enabled; a base station transmits a control signal, and the proprietary mobile phones forward the control signal; mobile phones receiving the control signal issue registration access, and transmit registration access signals; the proprietary mobile phones forward the registration access signals; and the base station receives the registration access signals, and finishes registration. The invention also provides the proprietary mobile phone. The repeater function of each proprietary mobile phone is enabled, and deep layer mobile phones are detected, registered and positioned in a relay way to finally finish the registration and search and rescue of all terminals, so that the influence of limitation of maximum transmitted power of the base station and the mobile phones and receiving sensitivity of antennae on the positioning of the mobile phones can be effectively avoided, mobile phone positioning efficiency can be improved, and the detection efficiency of the post-disaster search and rescue can be improved.
Description
Technical field
The present invention relates to post-disaster search and rescue life detection technical field, particularly a kind of post-disaster search and rescue mobile phone detection method and proprietary mobile phone.
Background technology
Natural calamity has the moment generation, destroys characteristics such as violent, that monitoring and prediction is difficult, social influence is far-reaching, and for example, disasters such as destructive strong earthquake, landslide cause huge harm and loss for national economic development and people life property safety.Domestic and international natural calamity example many times proves that loss is extremely important the emergency relief technical merit for disaster mitigation after the calamity.
China is also very weak at disaster emergency relief technical elements at present, mainly relies on manpower, rescue dogs and life-detection instrument to carry out life detection, to seek the survivor.Manpower and rescue dogs detection efficient are lower, and influenced seriously by surrounding enviroment.Existing life-detection instrument all exists and receives site environment to influence big, shortcomings such as the search volume scope is little, search speed slow, the quick stationkeeping ability of shortage, has satisfied not the demand that pile things on trapped personnel in ruins is searched and rescued fast after the calamity far away on a large scale.
To receive environmental impact serious in order to solve in the prior art life-detection instrument, causes the low problem of search efficiency, a kind ofly is suggested based on life detection method and system after the calamity of mobile phone.As shown in Figure 1, this system is made up of mobile phone (portable terminal) and some life-detection instruments (base station).After the condition of a disaster takes place, bring out trapped personnel mobile phone (portable terminal) by life-detection instrument (base station) transmission message and register access, the signal that the search life-detection instrument sends is set up urgent link link.Life-detection instrument is confirmed portable terminal and is carried out positioning action according to distress signal, finally confirms the position of trapped personnel, effectively sues and labours.
In realizing process of the present invention; The inventor finds that there is following problem at least in prior art: existing based on life detection and navigation system after the calamity of bringing out mobile telephone registration; Because the restriction of mobile phone, base station maximum transmission power and antenna receiving sensitivity, in addition after the calamity under the environment of ruins signal attenuation serious, wireless environment is complicated; Make that be embedded in the ruins deep layer is buried mobile phone and be difficult to be detected, and has had a strong impact on carrying out of search-and-rescue work.
Summary of the invention
In order to solve the restriction of in the prior art because base station and mobile phone maximum transmission power and antenna receiving sensitivity, influence deep layer and buried the problem that Mobile Phone Locating is surveyed, the embodiment of the invention provides a kind of post-disaster search and rescue mobile phone detection method and proprietary mobile phone.Said technical scheme is following:
A kind of post-disaster search and rescue mobile phone detection method, said method comprises:
Top layer, location mobile phone;
From the mobile phone of said top layer, select several proprietary mobile phones, the repeater function of opening said proprietary mobile phone;
The base station control signal, said proprietary mobile phone is transmitted said control signal;
The mobile phone initiation registration of receiving said control signal inserts, and sends registration access signal;
Said proprietary mobile phone is transmitted said registration and is inserted signal;
Said base station receives said registration and inserts signal, accomplishes registration.
Said base station receives said registration and inserts signal, comprising:
The registration that said base station receives the same said mobile phone transmission of different said proprietary mobile phone forwardings inserts signal, writes down the time that these registrations insert signals arrival, in conjunction with the position of said proprietary mobile phone, obtains the positioning result of said mobile phone.
The said positioning result that obtains said mobile phone comprises:
After the registration that said mobile phone sends inserts the said proprietary mobile phone forwarding of signal process, arrive the time of said base station
Wherein, t is that said mobile phone sends the time that registration inserts signal, t
jFor said base station receives the time that said registration inserts signal, j=1,2,3,4
Set said proprietary mobile phone E
jCoordinate is respectively (X
j, Y
j, Z
j), said mobile phone coordinate is that (x, y z), choose at least 4 proprietary mobile phone E
jRelated data, group of equations
Obtain the coordinate of said mobile phone; Wherein, said D
jBe proprietary mobile phone E
jAnd the distance between the said base station.
Said proprietary mobile phone is transmitted said registration when inserting signal, carries self information; Or
Close the repeater function of said proprietary mobile phone one by one, to confirm that said base station receives registration and inserts the pairing proprietary mobile phone of signal.
Said several proprietary mobile phones of from the mobile phone of said top layer, selecting, the repeater function of opening said proprietary mobile phone comprises:
From the top layer mobile phone of said positioned, several proprietary mobile phones of picked at random;
The repeater control signal is sent in the base station, and the proprietary mobile phone that control is chosen is opened the repeater function.
The repeater function of said proprietary mobile phone also comprises:
Amplify the control signal of said base station and the registration of said mobile phone initiation and insert signal.
A kind of proprietary mobile phone has the communication function of existing mobile phone, and this proprietary mobile phone also comprises the unit, repeater, is used to receive and registration access signal that the control signal of repeating base station emission and mobile phone send.
Unit, said repeater also is used to amplify the control signal of said base station and the registration of mobile phone transmission inserts signal.
Said proprietary mobile phone also comprises control unit, is used to receive said base station and sends the repeater control signal, controls the open and close of unit, said repeater.
Said proprietary mobile phone also comprises information unit, is used to store self information;
Unit, said repeater also is used for when the registration of transmitting said mobile phone transmission inserts signal, obtains the self information and the transmission of proprietary mobile phone from said information unit.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
The embodiment of the invention is carried out the layering processing, the location that utilizes tradition to accomplish the top layer mobile phone based on the localization method that brings out the mobile phone registration through the size of utilizing the terminal forward link attenuation to burying the terminal.After the location of accomplishing all mobile phones of top layer, select the repeater function that several have been accomplished the proprietary mobile phone of location and have opened them, send with the base stations control information amplification that receives and to deeper mobile phone.The deep layer mobile phone receives from the descending amplification of proprietary mobile phone and after the base stations control information of coming, sends registration and insert message, after the up amplification of proprietary mobile phone, sends to the base station and is used for the location to the deep layer mobile phone.Like this, utilize the repeater function of proprietary mobile phone, accomplish relay communication, finally adopt location algorithm can accomplish location all mobile phones to the deep layer mobile phone.The scheme that the embodiment of the invention provides can effectively be avoided because the influence that the restriction of base station and mobile phone maximum transmission power and antenna receiving sensitivity causes Mobile Phone Locating, thereby improve Mobile Phone Locating efficient, the detection efficient of collecting after the raising calamity.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is based on life-detection system sketch map after the calamity of mobile phone in the prior art;
Fig. 2 is an embodiment of the invention operation principle sketch map;
Fig. 3 is the post-disaster search and rescue mobile phone detection method principle flow chart that the embodiment of the invention 1 provides;
Fig. 4 is that the proprietary mobile phone in location that the embodiment of the invention 2 provides inserts signal relation method sketch map with registration;
Fig. 5 is the proprietary handset structure sketch map that the embodiment of the invention 4 provides.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
After natural calamities such as earthquake took place, it was stranded or buried to have a large amount of personnel in the ruins that heavy construction is collapsed, and these buried person person's mobile phone distributing positions are uncertain, also unbalanced.For example; The mobile phone that has is embedded in the top layer in ruins; Be easy to and can get in touch with the base station, the mobile phone that has then is embedded in the deep layer in ruins, because ruins itself are to the decay of wireless signal; The mobile phone that is embedded in deep layer can't be got in touch with the base station of life detection, thereby also just can't know the information such as position, quantity of deep layer mobile phone.In life detection and the navigation system, mobile phone terminal to be positioned only when the intensity that receives forward link signal reaches correct decoding request, just can be brought out to initiate to register and inserted after based on the calamity of bringing out mobile phone terminal registration access.Thereby; Its principle of the control method of the embodiment of the invention is: the location (proprietary mobile phone need possess controlled wireless discharging-directly station function) that the base station utilizes tradition to accomplish the top layer mobile phone based on the localization method that brings out mobile phone registration under the prerequisite of the repeater function that does not activate proprietary mobile phone, so-called top layer refer to communicating by letter between base station and mobile phone and can not fail because of link attenuation.After the location of accomplishing all mobile phones of top layer (being that mobile phone is received the registration completion message from the base station); Select the repeater function that several have been accomplished the proprietary mobile phone of location and have opened them, the base station that receives is sent in the message amplification of pilot channel, synchronizing channel and broadcast channel and to deeper mobile phone.The deep layer mobile phone receives from the descending amplification of proprietary mobile phone and after the base station message of coming, sends register request message, after the up amplification of proprietary mobile phone, sends to the base station and is used for the location to the deep layer mobile phone.Like this, utilize the repeater function of proprietary mobile phone, accomplish relay communication, finally adopt location algorithm can accomplish location all mobile phones to the deep layer mobile phone.Concrete work signal is as shown in Figure 2, and wherein light color is regular handset, and dark is proprietary mobile phone.
The embodiment of the invention is based on a kind of based on life detection method and system after the calamity of mobile phone; Detection base station in the embodiment of the invention can be based on the life-detection instrument in the life detection method of mobile phone, also can be other signal generation apparatus with corresponding function.
Embodiment 1
The post-disaster search and rescue mobile phone detection method that the embodiment of the invention 1 provides is specifically as shown in Figure 3, comprises the steps:
Step 10, top layer, location mobile phone.
Here, we set in the ruins after proprietary mobile phone and regular handset one are embedded in calamity.And the top layer mobile phone comprises proprietary mobile phone and regular handset.The top layer mobile phone refers to locating base station and exists line of sight link or just can obtain pinpoint mobile phone through common location algorithm, these mobile phones to be usually located at the top layer in ruins after the calamity, thereby is called as the top layer mobile phone.Corresponding, being embedded in the deep layer in ruins or can not directly and searching and rescuing the mobile phone of getting in touch the base station owing to the loss of various wireless environments becomes the deep layer mobile phone.
Concrete location algorithm can be with reference to following process: establishing the position fixing of treating of waiting to search and rescue the terminal is that (Z), the coordinate of k life-detection instrument is respectively for X, Y
The relative time clock deviation at life-detection instrument and terminal does
C is a radio wave propagation speed, t
iThe registering signal that measures mobile phone for each life-detection instrument synchronization arrives time delay, then
The quilt that can calculate the three-dimensional information at terminal in view of the above buries the position.
Step 20 is selected several proprietary mobile phones, the repeater function of opening proprietary mobile phone from accomplish the top layer mobile phone.
The proprietary mobile phone here is to possess the proprietary mobile phone that the repeater function is arranged, and except the communication function that possesses general mobile phone, also has the function of repeater.The repeater function can be opened or close through the corresponding repeater of base station control signal.
The repeater function here, employed repeater in the similar and general communication system is mainly used in the control signal of reception and repeating base station emission and the registration of mobile phone initiation and inserts signal, also is used to amplify these signals.That is to say that generally, the repeater can receive the control signal of base station and the registration of mobile phone initiation inserts signal, transmits after amplifying again.
For the location of top layer mobile phone, comprise regular handset and proprietary mobile phone that the top layer is all naturally, these proprietary mobile phones to guarantee certain quantity.From the top layer mobile phone of accomplishing the location, the proprietary mobile phone of selection part is at random opened their repeater function.General, for follow-up location algorithm needs, need choose 4 proprietary mobile phones usually and open their repeater function.
Step 30, the base station control signal, proprietary mobile phone is transmitted said control signal.
Here, the base station needs emissioning controling signal for accomplishing the location, receives that in order to control the mobile phone initiation of signal inserts registration.The control signal here is actually one and brings out signal, is similar to the information that existing ordinary base station is sent on pilot channel, synchronizing channel and broadcast channel, and main purpose is to make the mobile phone that receives this signal to initiate the process that registration inserts.The proprietary mobile phone of having opened the repeater function amplifies and transmits this control signal after receiving this control signal.
Step 40 receives that the mobile phone of control signal is initiated the registration access, sends registration and inserts signal.
Here,, can not initiate to respond to control signal again, have only the mobile phone that receives control signal for the first time just can initiate registration and insert because the mobile phone on top layer has been accomplished the location.General, all be to receive the control signal of transmitting through proprietary mobile phone.These mobile phones will be initiated registration and inserted after receiving control signal.
The registration that step 50, proprietary mobile phone are transmitted regular handset inserts signal.
The registration that mobile phone is initiated inserts, and signal can't directly send to the base station, thereby needs proprietary mobile phone to transmit once more, and the registration after the forwarding inserts signal and can be received by the base station
Step 60, the base station receives registration and inserts signal, accomplishes registration.
Here, register corresponding mobile phone after receiving registration access signal the base station.
In the present embodiment,, the control signal of base station is transmitted, originally can not be received that the deep layer mobile phone of base station control signal also can receive the control signal of forwarding thereby make through opening the repeater function of proprietary mobile phone.Again mobile phone is initiated to register the signal that inserts and transmit,, like this,, just can accomplish location for the deep layer mobile phone through the relay of proprietary mobile phone so that the base station can receive through the repeater function of proprietary mobile phone.
In the scheme that the embodiment of the invention 2 provides, after the control signal of base station was transmitted through proprietary repeater cell phone function, the mobile phone that receives began to initiate registration and inserts.The signal that registration inserts also need pass through the forwarding of proprietary repeater cell phone function.And the registration that the same mobile phone that the different proprietary mobile phone of the process that the base station receives is transmitted sends inserts signal, must combine these registrations to insert the times that signals arrive and the position of corresponding proprietary mobile phone, just can calculate the positioning result of detailed mobile phone.
General; In order to distinguish the difference that registration that different proprietary mobile phones transmits inserts signal; The information that can after proprietary mobile phone is transmitted registration access signal, add self; Like this, the signal that different proprietary mobile phones are transmitted can be distinguished through the information of proprietary mobile phone in the base station that receives signal, and combines the position of proprietary mobile phone to come the particular location of locating cellphone.
Special; The base station receives that the registration access information of certain deep layer mobile phone passes to each base station behind the proprietary mobile phone relaying of difference; Because the information that receives is identical, causing the base station can not distinguish its correspondence is from which proprietary mobile phone, to come then, thereby can't position.This just need close the repeater function of proprietary mobile phone one by one, thus corresponding proprietary mobile phone one by one and the relation of registering the access signal.
Concrete method comprises: from the proprietary mobile phone of accomplishing the location, select 4 and open the repeater function, the downstream signal of base station is amplified send to the deep layer mobile phone and initiate registration and insert to bring out the deep layer mobile phone.Send the amplification of up registration access signal to the deep layer mobile phone afterwards and send to the base station, time and intensity that base station statistics article one registration message arrives.(supposing that selected 4 proprietary mobile phones can guarantee that the time delay expansion that receives the registration access information does not overlap here).The repeater function of one of them proprietary mobile phone is turned off, time and intensity that base station this registration message of statistics arrives in the base station before mobile phone sends next bar registration access information.Repeat above-mentioned steps; Possesses the repeater function up to surplus next proprietary mobile phone; The registration that so far can obtain 4 time domain expansions inserts the pairing proprietary mobile phone of signal; It is corresponding one by one that registration access signal that just will receive and the proprietary mobile phone of transmitting it have been accomplished, and then just can accomplish the location to the deep layer mobile phone.Concrete sketch map is seen Fig. 4.
In the embodiment of the invention 3, need the particular location of mobile phone be positioned.That adopt usually is a kind of time of advent of poor (Time Difference Of Arrival; TDOA) localization method; Be called hyperbolic fix again; Belong to the passive location method, arrive time difference of the antenna element of different monitoring systems, come the emission source of transmitted radio signal is positioned through measuring radio signal.The basic principle of TDOA comprises: measure the time difference that same signal arrives different receivers, confirm a hyperbolic locus according to the time difference, many hyperbolic locus find intersections then can be realized the location to impact point.
The concrete location algorithm for mobile phone is following:
Being located at the deep layer mobile phone, to send the time that the 1st registration insert message be t.A certain base station B is receiving through proprietary mobile phone E
jThe moment that the 1st registration of amplifying inserts message is t
j, and then obtain the 1st registration access information through E
jThe time that arrives this base station does
If proprietary mobile phone E
jAnd the distance between the B of base station is D
j, the distance between deep layer mobile phone and the proprietary mobile phone then
If proprietary mobile phone E
jCoordinate is respectively (X
j, Y
j, Z
j), deep layer mobile phone coordinate is that (x, y z), then have
Ask deep layer mobile phone and proprietary mobile phone E respectively
jRange difference can obtain equation group:
Separate obtain deep layer mobile phone coordinate (x, y, z).
Through this algorithm, can calculate the coordinate position of concrete deep layer mobile phone, also just accomplished location for the deep layer mobile phone.
Embodiment 4
As shown in Figure 5, the embodiment of the invention 4 provides a kind of proprietary mobile phone, on the basis of the communication function with existing mobile phone, also comprises unit, repeater 100, is used to receive with the control signal of repeating base station emission and the registration of mobile phone transmission insert signal.
Here; Proprietary mobile phone at first has the communication function that any mobile phone had in the prior art; Can be GSM mobile handset or the CDMA mobile phone of 2G; Also can be CDMA2000 handset, WCDMA mobile phone or the TD-SCDMA mobile phone among the 3G, also can be corresponding mobile phone with it after the communication system upgrading of various standards.
Concrete; The proprietary feature of proprietary mobile phone is mainly reflected in the process that is used for life detection after the calamity; In order to adapt to this special application; Proprietary mobile phone need possess unit, a repeater 100, realizes and the similar reception forwarding capability for signal of existing repeater function, here mainly in order to the reception and the forwarding of the registration access signal realizing sending for the control signal of base station and mobile phone.
Special; For unit, repeater 100; Also possess the signal that receives is amplified the function that transmit the back, mainly comprise and transmitting after the control signal of the base station that receives amplified again, it also is to transmit behind same the amplification that the registration of sending for the mobile phone that receives inserts signal again.
Special, above-mentioned proprietary mobile phone also comprises control unit 200, is used to receive the base station and sends the repeater control signal, the open and close of control unit, repeater 100.
Special, above-mentioned proprietary mobile phone also comprises information unit 300, is used to store self information;
Unit, repeater 100 also is used for when the registration of transmitting the mobile phone transmission inserts signal, obtains the self information and the transmission of proprietary mobile phone from information unit 300.
Proprietary mobile phone in the present embodiment is mainly used in the application scenarios of above-mentioned several embodiment.Certainly, in other application scenarios, as long as need proprietary mobile phone to transmit and when amplifying, can use the proprietary mobile phone that present embodiment provides for signal.
To sum up, the embodiment of the invention is carried out the layering processing, the location that utilizes tradition to accomplish the top layer mobile phone based on the localization method that brings out the mobile phone registration through the size of utilizing the terminal forward link attenuation to burying the terminal.After the location of accomplishing all mobile phones of top layer, select the repeater function that several have been accomplished the proprietary mobile phone of location and have opened them, send with the base stations control information amplification that receives and to deeper mobile phone.The deep layer mobile phone receives from the descending amplification of proprietary mobile phone and after the base stations control information of coming, sends registration and insert message, after the up amplification of proprietary mobile phone, sends to the base station and is used for the location to the deep layer mobile phone.Like this, utilize the repeater function of proprietary mobile phone, accomplish relay communication, finally adopt location algorithm can accomplish location all mobile phones to the deep layer mobile phone.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. post-disaster search and rescue mobile phone detection method is characterized in that said method comprises:
Top layer, location mobile phone;
From the mobile phone of said top layer, select several proprietary mobile phones, the repeater function of opening said proprietary mobile phone;
The base station control signal, said proprietary mobile phone is transmitted said control signal;
The mobile phone initiation registration of receiving said control signal inserts, and sends registration access signal;
Said proprietary mobile phone is transmitted said registration and is inserted signal;
Said base station receives said registration and inserts signal, accomplishes registration.
2. the method for claim 1 is characterized in that, said base station receives said registration and inserts signal, comprising:
The registration that said base station receives the same said mobile phone transmission of different said proprietary mobile phone forwardings inserts signal, writes down the time that these registrations insert signals arrival, in conjunction with the position of said proprietary mobile phone, obtains the positioning result of said mobile phone.
3. method as claimed in claim 2 is characterized in that, the said positioning result that obtains said mobile phone comprises:
After the registration that said mobile phone sends inserts the said proprietary mobile phone forwarding of signal process, arrive the time of said base station
Wherein, t is that said mobile phone sends the time that registration inserts signal, t
jFor said base station receives the time that said registration inserts signal, j=1,2,3,4
Set said proprietary mobile phone E
jCoordinate is respectively (X
j, Y
j, Z
j), said mobile phone coordinate is that (x, y z), choose at least 4 proprietary mobile phone E
jRelated data, group of equations
Obtain the coordinate of said mobile phone; Wherein, said D
jBe proprietary mobile phone E
jAnd the distance between the said base station.
4. like claim 2 or 3 described methods, it is characterized in that said proprietary mobile phone is transmitted said registration when inserting signal, carries self information; Or
Close the repeater function of said proprietary mobile phone one by one, to confirm that said base station receives registration and inserts the pairing proprietary mobile phone of signal.
5. the method for claim 1 is characterized in that, said several proprietary mobile phones of from the mobile phone of said top layer, selecting, and the repeater function of opening said proprietary mobile phone comprises:
From the top layer mobile phone of said positioned, several proprietary mobile phones of picked at random;
The repeater control signal is sent in the base station, and the proprietary mobile phone that control is chosen is opened the repeater function.
6. like claim 1 or 5 described methods, it is characterized in that the repeater function of said proprietary mobile phone also comprises:
Amplify the control signal of said base station and the registration of said mobile phone initiation and insert signal.
7. proprietary mobile phone has the communication function of existing mobile phone, it is characterized in that this proprietary mobile phone also comprises the unit, repeater, is used to receive and registration access signal that the control signal of repeating base station emission and mobile phone send.
8. proprietary mobile phone as claimed in claim 7 is characterized in that, unit, said repeater also is used to amplify the control signal of said base station and the registration of mobile phone transmission inserts signal.
9. like claim 7 or 8 described proprietary mobile phones, it is characterized in that said proprietary mobile phone also comprises control unit, be used to receive said base station and send the repeater control signal, control the open and close of unit, said repeater.
10. like claim 7 or 8 described proprietary mobile phones, it is characterized in that said proprietary mobile phone also comprises information unit, is used to store self information;
Unit, said repeater also is used for when the registration of transmitting said mobile phone transmission inserts signal, obtains the self information and the transmission of proprietary mobile phone from said information unit.
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