CN101227209B - Method and theftproof system of mobile terminal based on blue tooth submachine - Google Patents

Method and theftproof system of mobile terminal based on blue tooth submachine Download PDF

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Publication number
CN101227209B
CN101227209B CN2008100652122A CN200810065212A CN101227209B CN 101227209 B CN101227209 B CN 101227209B CN 2008100652122 A CN2008100652122 A CN 2008100652122A CN 200810065212 A CN200810065212 A CN 200810065212A CN 101227209 B CN101227209 B CN 101227209B
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China
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radio
blue tooth
frequency
signal strength
tooth submachine
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CN2008100652122A
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Chinese (zh)
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CN101227209A (en
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李红卫
李桐春
何华
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宇龙计算机通信科技(深圳)有限公司
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Priority to CN2008100652122A priority Critical patent/CN101227209B/en
Publication of CN101227209A publication Critical patent/CN101227209A/en
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    • Y02D70/42

Abstract

The invention is applied to the mobile communication field, which provides an anti-theft method of a mobile terminal end on the basis of a blue tooth sub machine, wherein the method comprises following steps: detecting strength of radiofrequency signals which are transmitted by an end to end, calculating a strength changing rate of the radiofrequency signals, and regulating the interval of the communication time of both communication sides according to the change rate of the radiofrequency signals which are obtained through calculating. The invention also provides an anti-theft system of a mobile terminal end on the basis of a blue tooth sub machine, wherein strength of radiofrequency signals which are transmitted by an end to end can be realized to detect and the strength change rate of the radiofrequency signals is calculated through arranging an arithmetic unit for the strength change rate of the radiofrequency signals and a regulating unit for communication time interval on the mobile terminal end and the blue tooth sub machine, therefore the interval of the communication time between both communication sides is self-adapted and regulated according to the strength change rate of the radiofrequency signals, thereby frequent communications which are unnecessary between both communication sides can be avoided, and the anti-theft system not only reduces power consumption of the system, but also provides effective stolen protection for the mobile terminal end.

Description

A kind of theftproof system of mobile terminal and method based on blue tooth submachine

Technical field

The invention belongs to moving communicating field, relate in particular to a kind of theftproof system of mobile terminal and method based on blue tooth submachine.

Background technology

Bluetooth is a kind of technical specification of short-distance wireless communication, and its initial target is that the wire cable that replaces on the various digital devices such as existing palmtop PC, mobile phone connects.From present should being used for, because the equipment volume based on Bluetooth technology is little, power is low and anti-interference good, it is used and has been not limited to computer peripheral equipment, almost can be integrated among any digital device, those mobile device and portable equipments not high particularly to the transfer of data rate requirement, for example, PDA (Personal Digital Assistant, personal digital assistant).

Along with the arrival of information age " information explosion ", portable terminal is being played the part of more and more important role as PDA, mobile phone etc. in daily life.Owing to have characteristics such as high-intelligentization, high speed data transfer and mass memory, more and more be subjected to people's favor, mobile terminal stores increasing user profile.Yet in case portable terminal is lost, all information that are stored in the portable terminal are stolen thereupon, bring about great losses to the user.

At the problems referred to above, a solution that prior art provides is: the user is provided with the coverage of the transmitted power of a Bluetooth RF signal with control transmission information, simultaneously, call duration time interval by portable terminal of default and wireless anti-theft supervising device, if receiving terminal is not received the message that transmitting terminal sends when this time interval arrives, then trigger alarm signal, and then carry out anti-theft feature.

The defective of technique scheme is: when call duration time is set more at interval, although can protect user's portable terminal at any time, yet, can cause the increase of system power dissipation, and then cause the shortening of mobile terminal standby time because portable terminal is frequently communicated by letter with the wireless anti-theft supervising device; When call duration time is set when longer at interval,,, and then the robber is made an escape in this section long period interval because this moment, portable terminal was not communicated by letter with the wireless anti-theft supervising device if portable terminal was lost at interval in this long period.In addition, this method also needs the user manually to set the transmitted power of Bluetooth RF signal, and then controls the coverage of transmission information.When this apart from being provided with too hour, can influence communicating by letter of portable terminal and other bluetooth equipments; And when this apart from be provided with too big the time, then can't effectively protect portable terminal.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of theftproof system of mobile terminal and method based on blue tooth submachine, be intended to solve the transmitted power that prior art can't be provided with rational call duration time interval and radiofrequency signal, thereby can not carry out effectively antitheft problem portable terminal.

The embodiment of the invention is achieved in that a kind of anti-theft method for mobile terminal based on blue tooth submachine, said method comprising the steps of:

The radio-frequency (RF) signal strength that launch A, detection opposite end is also calculated the radio-frequency (RF) signal strength rate of change, difference that described radio-frequency (RF) signal strength rate of change is the double radio-frequency (RF) signal strength that receives and call duration time ratio at interval; According to calculating gained radio-frequency (RF) signal strength rate of change, adjust the call duration time interval of communicating pair;

B, if the rate of change of the double calculating gained of the radio-frequency (RF) signal strength rate of change computing unit radio-frequency (RF) signal strength of blue tooth submachine still reduces, its radio receiving transmitting module is according to this trend, trigger its alarm unit, and the warning triggering signal is sent to the radio receiving transmitting module of portable terminal by its radio receiving transmitting module, the alarm unit of described radio receiving transmitting module triggering mobile terminals, thus make the alarm unit of portable terminal and blue tooth submachine send alarm signal simultaneously.

Another purpose of the embodiment of the invention is to provide a kind of theftproof system of mobile terminal based on blue tooth submachine, comprise portable terminal and blue tooth submachine, described portable terminal and blue tooth submachine comprise a self adaptation adjusting module respectively, described self adaptation adjusting module comprises radio-frequency (RF) signal strength rate of change computing unit and call duration time adjustment unit at interval, wherein

Radio-frequency (RF) signal strength rate of change computing unit is used to calculate the rate of change of radio-frequency (RF) signal strength;

Call duration time interval adjustment unit is used for calculating according to described radio-frequency (RF) signal strength rate of change computing unit the rate of change of gained radio-frequency (RF) signal strength, adjusts the blue tooth submachine and the communications of Mobile Terminals time interval automatically;

If the rate of change of the double calculating gained of the radio-frequency (RF) signal strength rate of change computing unit radio-frequency (RF) signal strength of blue tooth submachine still reduces, its radio receiving transmitting module is according to this trend, trigger its alarm unit, and the warning triggering signal is sent to the radio receiving transmitting module of portable terminal by its radio receiving transmitting module, the alarm unit of described radio receiving transmitting module triggering mobile terminals, thus make the alarm unit of portable terminal and blue tooth submachine send alarm signal simultaneously.

The embodiment of the invention is by being provided with radio-frequency (RF) signal strength rate of change computing unit and call duration time adjustment unit at interval on portable terminal and blue tooth submachine thereof; can realize detecting opposite end institute emitting radio frequency signal intensity and calculate the radio-frequency (RF) signal strength rate of change; thereby adjust the call duration time interval of communicating pair adaptively according to gained radio-frequency (RF) signal strength rate of change; thereby avoided the unnecessary frequent communication of both sides; both reduce the power consumption of system, provided effectively stolen protection to portable terminal again.

Description of drawings

Fig. 1 is the theftproof system of mobile terminal structural representation based on blue tooth submachine that first embodiment of the invention provides;

Fig. 2 is the theftproof system of mobile terminal structural representation based on blue tooth submachine that second embodiment of the invention provides;

Fig. 3 is the realization flow figure based on the anti-theft method for mobile terminal of blue tooth submachine that first embodiment of the invention provides.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

Among the embodiment provided by the invention, portable terminal and blue tooth submachine all comprise radio receiving transmitting module, 2.4GHz radio-frequency (RF) signal strength detecting unit, self adaptation adjusting module and alarm unit at least.Radio receiving transmitting module is responsible for the transmission and the reception of system communication both sides information, 2.4GHz the radio-frequency (RF) signal strength detecting unit is used to detect the radio-frequency (RF) signal strength that transmit leg sends, the self adaptation adjusting module comprises radio-frequency (RF) signal strength rate of change computing unit and call duration time adjustment unit at interval, be used for according to the radio-frequency (RF) signal strength that detects, calculate its rate of change and automatically adjust call duration time at interval to a reasonable value, alarm unit is used for sending when portable terminal or blue tooth submachine are stolen alarm signal.

See also Fig. 1, the theftproof system of mobile terminal based on blue tooth submachine that first embodiment of the invention provides for convenience of explanation, only shows the part relevant with the embodiment of the invention.This system comprises portable terminal 11 and blue tooth submachine 12, portable terminal can but to be not limited to be PDA or intelligent mobile phone.

Portable terminal 11 comprises radio receiving transmitting module 111,2.4GHz radio-frequency (RF) signal strength detecting unit 112, adaptation module 113 and alarm unit 114.Described adaptation module 113 comprises call duration time adjustment unit 1131 and radio-frequency (RF) signal strength rate of change computing unit 1132 at interval.In the present embodiment, according to the radio-frequency (RF) signal strength that detects, calculate also automatic call duration time interval to the reasonable value of adjusting of its rate of change and realize at blue tooth submachine 12.

Blue tooth submachine 12 comprises radio receiving transmitting module 121,2.4GHz radio-frequency (RF) signal strength detecting unit 122, adaptation module 123 and alarm unit 124.Described adaptation module 123 comprises call duration time adjustment unit 1231 and radio-frequency (RF) signal strength rate of change computing unit 1232 at interval.

The radio receiving transmitting module 111 of described portable terminal 11 is used for carrying out information interaction with the radio receiving transmitting module 121 of blue tooth submachine 12, and these information comprise handshake, new call duration time spacing value and warning triggering signal or the like.The 2.4GHz radio-frequency (RF) signal strength detecting unit 112 and 122 of described portable terminal 11 and blue tooth submachine 12 is respectively applied for the radiofrequency signal that detects blue tooth submachine 12 and portable terminal 11 transmissions.The alarm unit 114 and 124 of described portable terminal 11 and blue tooth submachine 12 all is used for sending alarm signal when portable terminal 11 or blue tooth submachine 12 are stolen.

First embodiment of the invention provided based on the course of work of the theftproof system of mobile terminal of blue tooth submachine can be such: the initial communication time interval that the radio receiving transmitting module 111 of portable terminal 11 sets during with system initialization sends handshake for blue tooth submachine 12, and 11 requests of expression portable terminal establish a communications link with blue tooth submachine 12; The radio receiving transmitting module 121 of blue tooth submachine 12 receives described handshake, and this request is made due response to portable terminal 11; After blue tooth submachine 12 and portable terminal 11 established a communications link, when blue tooth submachine 12 whenever received a handshake, its radio-frequency (RF) signal strength detecting unit 122 detected the radio-frequency (RF) signal strength that portable terminal 11 is sent to blue tooth submachine 12; The radio-frequency (RF) signal strength that is detected by radio-frequency (RF) signal strength detecting unit 122 when its radio-frequency (RF) signal strength rate of change computing unit 1232 receives handshake according to blue tooth submachine 12 is double is calculated the rate of change of double radio-frequency (RF) signal strength; Call duration time interval adjustment unit 1231 calculates the rate of change of gained radio-frequency (RF) signal strength according to radio-frequency (RF) signal strength rate of change computing unit 1232, adjust the call duration time interval of blue tooth submachine 12 and portable terminal 11, and new call duration time is sent at interval the radio receiving transmitting module 111 of portable terminal 11 by radio receiving transmitting module 121; The radio receiving transmitting module 111 of portable terminal 11 serves as a unit at interval with this new call duration time spacing value, sends handshake to blue tooth submachine 12, portable terminal 11 and blue tooth submachine 12 beginnings new one take turns mutual.When the radio-frequency (RF) signal strength rate of change reduced, the call duration time of blue tooth submachine 12 adjustment unit 1231 appropriateness at interval reduced call duration time at interval.In this case, if the rate of change of the radio-frequency (RF) signal strength rate of change computing unit 1232 double calculating gained radio-frequency (RF) signal strength of blue tooth submachine still reduces, its radio receiving transmitting module 121 is according to this trend, trigger its alarm unit 124, and the warning triggering signal is sent to the radio receiving transmitting module 111 of portable terminal 11 by its radio receiving transmitting module 121, the alarm unit 114 of described radio receiving transmitting module 111 triggering mobile terminals 11, thus make the alarm unit of portable terminal 11 and blue tooth submachine 12 send alarm signal simultaneously.

See also Fig. 2, the theftproof system of mobile terminal based on blue tooth submachine that second embodiment of the invention provides for convenience of explanation, only shows the part relevant with the embodiment of the invention.This system comprises portable terminal 21 and blue tooth submachine 22, portable terminal can but to be not limited to be PDA or other intelligent mobile phones.

Portable terminal 21 comprises radio receiving transmitting module 211,2.4GHz radio-frequency (RF) signal strength detecting unit 212, adaptation module 213 and alarm unit 214.Described adaptation module 213 comprises call duration time adjustment unit 2131 and radio-frequency (RF) signal strength rate of change computing unit 2132 at interval.In the present embodiment, according to the radio-frequency (RF) signal strength that detects, calculate also automatic call duration time interval to the reasonable value of adjusting of its rate of change and realize at portable terminal 21.

Blue tooth submachine 22 comprises radio receiving transmitting module 221,2.4GHz radio-frequency (RF) signal strength detecting unit 222, adaptation module 223 and alarm unit 224.Described adaptation module 223 comprises call duration time adjustment unit 2231 and radio-frequency (RF) signal strength rate of change computing unit 2232 at interval.

The radio receiving transmitting module 211 of described portable terminal 21 is used for carrying out information interaction with the radio receiving transmitting module 221 of blue tooth submachine 22, and these information comprise handshake, new call duration time spacing value and warning triggering signal or the like.The 2.4GHz radio-frequency (RF) signal strength detecting unit 212 and 222 of described portable terminal 21 and blue tooth submachine 22 is respectively applied for the radiofrequency signal that detects blue tooth submachine 22 and portable terminal 21 transmissions.The alarm unit 214 and 224 of described portable terminal 21 and blue tooth submachine 22 all is used for sending alarm signal when portable terminal 21 or blue tooth submachine 22 are stolen.

Second embodiment of the invention provided based on the course of work of the theftproof system of mobile terminal of blue tooth submachine can be such: the initial communication time interval that the radio receiving transmitting module 221 of blue tooth submachine 22 sets during with system initialization sends handshake for portable terminal 21, and 22 requests of expression blue tooth submachine establish a communications link with portable terminal 21.The radio receiving transmitting module 211 of portable terminal 21 receives described handshake, and this request is made due response to blue tooth submachine 22; After portable terminal 21 and blue tooth submachine 22 established a communications link, 2.4GHz radio-frequency (RF) signal strength detecting unit 212 detected the radio-frequency (RF) signal strength that blue tooth submachine 22 is sent to portable terminal 21.The radio-frequency (RF) signal strength that is detected by 2.4GHz radio-frequency (RF) signal strength detecting unit 212 when radiofrequency signal rate of change computing unit 2132 receives handshake according to portable terminal 21 is double is calculated the rate of change of radio-frequency (RF) signal strength.Call duration time interval adjustment unit 2131 calculates the rate of change of gained radio-frequency (RF) signal strength according to radio-frequency (RF) signal strength rate of change computing unit 2132, adjust the call duration time interval of portable terminal 21 and blue tooth submachine 22, and new call duration time is sent at interval the radio receiving transmitting module 221 of blue tooth submachine 22 by radio receiving transmitting module 211.The radio receiving transmitting module 221 of blue tooth submachine 22 is spaced apart at interval unit with this new call duration time, sends handshake to portable terminal 21, blue tooth submachine 21 and portable terminal 22 beginnings new one take turns mutual.When the radio-frequency (RF) signal strength rate of change reduced, the call duration time of portable terminal 21 adjustment unit 2131 appropriateness at interval reduced call duration time at interval.In this case, if the rate of change of the radio-frequency (RF) signal strength rate of change computing unit 2132 double calculating gained radio-frequency (RF) signal strength of portable terminal 21 still reduces, its radio receiving transmitting module 211 is according to this trend, trigger its alarm unit 214, and the warning triggering signal is sent to the radio receiving transmitting module 221 of blue tooth submachine 22 by its radio receiving transmitting module 211, described radio receiving transmitting module 221 triggers the alarm unit 224 of blue tooth submachine 22, thereby the warning device of blue tooth submachine 22 and portable terminal 21 sends alarm signal simultaneously.

In the present embodiment, the 2.4GHz radio-frequency (RF) signal strength detecting unit that comprises of portable terminal 21 and blue tooth submachine 22 is respectively applied for the radiofrequency signal that detects the other side.When not receiving the radiofrequency signal of (rather than the radio-frequency (RF) signal strength rate of change reduces) the other side transmission fully a side, the recipient initiatively triggers local alarm unit, and alarm unit sends alarm signal, reminds customer mobile terminal or blue tooth submachine to meet with theft.

As Fig. 3, the theftproof system of mobile terminal based on blue tooth submachine that provides with first embodiment of the invention is an example, describes the operation principle of burglary-resisting system in detail.The operation principle based on the theftproof system of mobile terminal of blue tooth submachine that second embodiment of the invention provides is similar with it, repeats no more.

Step S301 carries out the initialization setting to system.

In embodiment provided by the invention, the system initialization setting comprises: the initial communication time interval of setting between portable terminal and the blue tooth submachine is 0.1 second, the rate of change of radio-frequency (RF) signal strength is 0, and portable terminal and the blue tooth submachine transmitting power when sending anti-theft signal is 4dBm.Call duration time of the present invention is spaced apart one and changes parameter, determines when its initial value carries out initialization in system, is adjusted adaptively by the rate of change of blue tooth submachine according to radio-frequency (RF) signal strength more afterwards.

Step S302, portable terminal is spaced apart unit at interval with the call duration time that obtains, and sends handshake to blue tooth submachine.

0.1 second initial communication time interval that portable terminal is set during at first with system initialization is a unit at interval, sends handshake to blue tooth submachine and establishes a communications link with it with request.In the later stage, for example after step S308 or the step S313, blue tooth submachine is after making the self adaptation adjustment at interval to call duration time, and portable terminal will be spaced apart unit at interval with new call duration time, resend handshake, and request establishes a communications link with blue tooth submachine.

Step S303, blue tooth submachine calculates the rate of change of radio-frequency (RF) signal strength.

The handshake that portable terminal of the every reception of blue tooth submachine sends, utilize its 2.4GHz radio-frequency (RF) signal strength detecting unit to detect the signal strength signal intensity of the radiofrequency signal of portable terminal transmission, get double detection gained radio-frequency (RF) signal strength, then can obtain the rate of change of radio-frequency (RF) signal strength, concrete computational methods are as follows:

Ratio (i)=(P (i)-P (i-1))/T interval

Wherein, P (i-1)The detected radio-frequency (RF) signal strength of blue tooth submachine when the expression portable terminal sends handshake the i-1 time, P (i)Blue tooth submachine is picked up the radio-frequency (RF) signal strength that measures, T to expression portable terminal the i time (promptly being right after the i-1 time afterwards once) when sending handshake IntervalThe expression portable terminal is at the i-1 time and the i time call duration time interval double to the time interval of blue tooth submachine transmission handshake, that the call duration time of setting when also being system initialization interval or later stage are obtained when the blue tooth submachine self adaptation is adjusted.Ratio (i)Be illustrated in i call duration time interval T IntervalThe rate of change of interior radio-frequency (RF) signal strength.For example, the initial communication time interval during system initialization is 0.1 second, and the detected radio-frequency (RF) signal strength of blue tooth submachine is P when supposing the 1st transmission of portable terminal handshake 1, the detected radio-frequency (RF) signal strength of blue tooth submachine was P when portable terminal sent handshake the 2nd time 2, then within 0.1 second initial communication time interval, the rate of change of radio-frequency (RF) signal strength is exactly (P 2-P 1)/0.1.

Step S304, the rate of change of more continuous two call duration times radio-frequency (RF) signal strength at interval.

In the embodiment of the invention, by the rate of change Ratio of more continuous two call duration times radio-frequency (RF) signal strength at interval (i)And Ratio (i-1)Size, determine whether call duration time is adjusted at interval.Ratio (i)And Ratio (i-1)Definition described identical with step S303.

Step S305 adjusts adaptively at interval call duration time, and feeds back to portable terminal to step S308.

In embodiment provided by the invention, if the rate of change Ratio of i call duration time radio-frequency (RF) signal strength at interval (i)Rate of change Ratio greater than i-1 call duration time radio-frequency (RF) signal strength at interval (i-1), then in order to reduce the power consumption that portable terminal and blue tooth submachine are frequently communicated by letter, appropriateness increases call duration time (step S305) at interval, and judges that whether new call duration time is at interval greater than a default time T (step S306).

The meaning of default time T is to be controlled at call duration time amplification at interval among the step S305.New call duration time is excessive at interval, then system will occur and the same defective of prior art scheme, so, amplification is excessive at interval when call duration time, so that surpassed default time T (the "Yes" branch of step S306), show that then this call duration time is unreasonable at interval, blue tooth submachine adjusts again, with default time T as new call duration time (step S307) at interval; Otherwise, with the step S305 gained time interval be new call duration time (the "No" branch of step S306) at interval, and the call duration time that this is new at interval feeds back to portable terminal (step S308) by radio receiving transmitting module, and portable terminal is spaced apart at interval with this new call duration time that unit sends handshake to blue tooth submachine.

Step S309 is to step S311, and appropriateness reduces call duration time at interval.

If the rate of change Ratio of i call duration time radio-frequency (RF) signal strength at interval (i)Less than in the rate of change Ratio of i-1 call duration time radio-frequency (RF) signal strength at interval (i-1)(the "No" branch of step S304), should not determine that then portable terminal is stolen, may be set in the initial communication time interval improper or radio-frequency (RF) signal strength change too small due to, therefore, blue tooth submachine adjusts call duration time exploratoryly at interval, appropriateness reduces call duration time (step S309) at interval, simultaneously, the call duration time that this is new feeds back to portable terminal (step S310) at interval, and portable terminal is spaced apart the interval unit with this new call duration time and sends handshake (step S311) to blue tooth submachine.

Step S312, blue tooth submachine calculates the rate of change of new radio-frequency (RF) signal strength.

Blue tooth submachine calculates the rate of change of new radio-frequency (RF) signal strength, and its computational methods are identical with step S303, and just call duration time changes at interval to some extent, and the call duration time that sets with step S309 is spaced apart new call duration time at interval.

Step S313 under new call duration time interval, judges the rate of change of the radio-frequency (RF) signal strength that blue tooth submachine receives to step S315, makes the selection of whether reporting to the police.

In an embodiment of the present invention, if the rate of change Ratio of radio-frequency (RF) signal strength (i+1)Rate of change Ratio less than radio-frequency (RF) signal strength (i)(the "Yes" branch of step S313) promptly, reduced under the call duration time situation at interval (step S309), with the Ratio among the step S304 at blue tooth submachine (i)And Ratio (i-1)Compare the rate of change Ratio of radio-frequency (RF) signal strength (i+1)Still reducing, then having sufficient reason to think that portable terminal meets with theft.Blue tooth submachine sends the warning triggering signal, and the warning device that triggers local terminal also is sent to the warning triggering signal portable terminal (step S314) of far-end, and portable terminal triggers warning device, sends alarm signal (step S315).

If the rate of change Ratio of radio-frequency (RF) signal strength (i+1)Rate of change Ratio greater than radio-frequency (RF) signal strength (i)(the "No" branch of step S313), the rate of change that then shows the radio-frequency (RF) signal strength among the step S304 reduces (the "No" branch of step S304) and belongs to fortuitous phenomena, be not that portable terminal meets with due to the theft, show also simultaneously that the call duration time adjustment at interval among the step S309 is reasonably, system will be with the running again at interval of this new call duration time.

Because the both sides of system can detect the intensity of radiofrequency signal mutually, therefore, in embodiment provided by the invention, when a side does not receive the radiofrequency signal of (rather than the radio-frequency (RF) signal strength rate of change reduces) the other side transmission fully, the recipient initiatively triggers local alarm unit, alarm unit sends alarm signal, reminds customer mobile terminal or blue tooth submachine to meet with theft.

In embodiments of the present invention, utilize 2.4GHz radio-frequency (RF) signal strength detecting unit to detect radio-frequency (RF) signal strength,, compare the magnitude relationship of the rate of change of gained radio-frequency (RF) signal strength by calculating the rate of change of radio-frequency (RF) signal strength.Under or the situation that increases constant at the rate of change of radio-frequency (RF) signal strength, appropriateness increases call duration time at interval; Under the situation that the rate of change of radio-frequency (RF) signal strength reduces, appropriateness reduces call duration time at interval.When reducing the call duration time interval,, think that then portable terminal meets with theft, triggers alarm unit if the rate of change of double calculating gained radio-frequency (RF) signal strength continues to reduce.The transmitting power that technical scheme provided by the invention does not need the user to set radiofrequency signal prevents that portable terminal is stolen; simultaneously; variation along with the rate of change of radio-frequency (RF) signal strength; adjust call duration time adaptively at interval; avoided the unnecessary frequent communication of both sides; both reduce the power consumption of system, provided effectively stolen protection to portable terminal again.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. the anti-theft method for mobile terminal based on blue tooth submachine is characterized in that, said method comprising the steps of:
The radio-frequency (RF) signal strength that launch A, detection opposite end is also calculated the radio-frequency (RF) signal strength rate of change, difference that described radio-frequency (RF) signal strength rate of change is the double radio-frequency (RF) signal strength that receives and call duration time ratio at interval; According to calculating gained radio-frequency (RF) signal strength rate of change, adjust the call duration time interval of communicating pair;
B, if the rate of change of the double calculating gained of the radio-frequency (RF) signal strength rate of change computing unit radio-frequency (RF) signal strength of blue tooth submachine still reduces, its radio receiving transmitting module is according to this trend, trigger its alarm unit, and the warning triggering signal is sent to the radio receiving transmitting module of portable terminal by its radio receiving transmitting module, the alarm unit of described radio receiving transmitting module triggering mobile terminals, thus make the alarm unit of portable terminal and blue tooth submachine send alarm signal simultaneously.
2. the anti-theft method for mobile terminal based on blue tooth submachine as claimed in claim 1 is characterized in that, also comprises step before described steps A:
The mutual handshake of blue tooth submachine and portable terminal is set up communicating to connect between the two.
3. the anti-theft method for mobile terminal based on blue tooth submachine as claimed in claim 2, it is characterized in that, described blue tooth submachine and portable terminal are spaced apart the at interval mutual handshake of unit with described call duration time, detect the radio-frequency (RF) signal strength that the opposite end sent during each mutual handshake.
4. the anti-theft method for mobile terminal based on blue tooth submachine as claimed in claim 1 is characterized in that, if the rate of change of described calculating gained radio-frequency (RF) signal strength increases, then increases the call duration time interval of communicating pair; If the rate of change of described calculating gained radio-frequency (RF) signal strength reduces, then reduce the call duration time interval of communicating pair.
5. the anti-theft method for mobile terminal based on blue tooth submachine as claimed in claim 4, it is characterized in that, after the call duration time interval of described increase communicating pair, if the new call duration time of gained is at interval more than or equal to the default time, then with the default time as new call duration time at interval, otherwise, be spaced apart new call duration time at interval with the call duration time of the communicating pair of described increase.
6. theftproof system of mobile terminal based on blue tooth submachine, comprise portable terminal and blue tooth submachine, it is characterized in that, described portable terminal and blue tooth submachine comprise a self adaptation adjusting module respectively, described self adaptation adjusting module comprises radio-frequency (RF) signal strength rate of change computing unit and call duration time adjustment unit at interval, wherein
Radio-frequency (RF) signal strength rate of change computing unit is used to calculate the rate of change of radio-frequency (RF) signal strength;
Call duration time interval adjustment unit is used for calculating according to described radio-frequency (RF) signal strength rate of change computing unit the rate of change of gained radio-frequency (RF) signal strength, adjusts the blue tooth submachine and the communications of Mobile Terminals time interval automatically;
If the rate of change of the double calculating gained of the radio-frequency (RF) signal strength rate of change computing unit radio-frequency (RF) signal strength of blue tooth submachine still reduces, its radio receiving transmitting module is according to this trend, trigger its alarm unit, and the warning triggering signal is sent to the radio receiving transmitting module of portable terminal by its radio receiving transmitting module, the alarm unit of described radio receiving transmitting module triggering mobile terminals, thus make the alarm unit of portable terminal and blue tooth submachine send alarm signal simultaneously.
7. the theftproof system of mobile terminal based on blue tooth submachine as claimed in claim 6 is characterized in that, mutual information comprises handshake, call duration time interval and warning triggering signal between described portable terminal and the blue tooth submachine.
CN2008100652122A 2008-01-25 2008-01-25 Method and theftproof system of mobile terminal based on blue tooth submachine CN101227209B (en)

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