CN103442428A - Relative motion positioning method based on Bluetooth device names - Google Patents
Relative motion positioning method based on Bluetooth device names Download PDFInfo
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- CN103442428A CN103442428A CN2013103046977A CN201310304697A CN103442428A CN 103442428 A CN103442428 A CN 103442428A CN 2013103046977 A CN2013103046977 A CN 2013103046977A CN 201310304697 A CN201310304697 A CN 201310304697A CN 103442428 A CN103442428 A CN 103442428A
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Abstract
The invention provides a relative motion positioning method based on Bluetooth device names. The method comprises the following steps that surrounding Bluetooth devices are scanned through Bluetooth to acquire surrounding Bluetooth device names; grouped information fields in the surrounding Bluetooth device names are selected as the Bluetooth device names of grouped serial number information, and are denoted as Bluetooth device names in a group; Bluetooth device information in information domain fields of the Bluetooth device names in the group is extracted according to the preset corresponding relationship between the Bluetooth device information and the information domain fields, and the Bluetooth device information in the group is added to the information domain fields of the Bluetooth device names of the Bluetooth device information in the group. Through the method, relative motion positioning can be conveniently and fast achieved in a low-cost mode, and the problems that an existing relative motion positioning method is tedious and high in cost are solved.
Description
Technical field
The present invention relates to network communication field, be specifically related to a kind of localization method that relatively moves based on the bluetooth equipment name.
Background technology
How universal along with mobile device, utilize mobile device to be followed the tracks of the mobile subscriber and location seems very important.Wherein, a class application---the location that relatively moves is arranged, judge that some mobile subscribers are whether around specific other mobile subscribers.Such as, a guide leads an old man tourist group to go the other places tourism, and in tourist attractions, common people can be more crowded, the environment more complicated, the guide wonders whether these members do not fall behind or wander away in the crowd, whether these members also or not around oneself.Same application also comprises, teacher leads students to go spring outing etc.
For now, the location technology of main flow is the GPS(global positioning system) technology, it can find out mobile subscriber's absolute position, as latitude and longitude information, this application in location but this absolute address` is not suitable for relatively moving.With regard to above example, at first the member need to send to the guide to the absolute position of oneself, and this can bring extra communication cost; Secondly, the guide also needs to determine own position, and then is contrasted by the address of oneself with to member's address, and to determine member's relative position, this can introduce extra calculation cost.In addition, the GPS module is more expensive, and indoor because acknowledge(ment) signal is bad, this also becomes a limitation of GPS technology.Similarly the physical positioning technology also has the location based on base station, " Google in length and breadth " system as Google's release, it relies on the huge database of setting up in advance, make the corresponding positional information in each base station, when the user need to locate, user's mobile phone can be obtained No. ID of base station, place, and Google, in length and breadth according to this ID, finds corresponding position at lane database.This location technology can be in office work, and shortcoming can be brought extra communication cost except the same with GPS, also has two shortcomings: the one, locate inaccurate because the scope that base station covers has several kilometers far; The 2nd, building database in advance, this need to expend a large amount of manpower financial capacities.
In sum, the existing location technology location of all can not well supporting to relatively move, our target is a set of cheap, be easy to realize,, solution of energy-conservation that can use in indoor and outdoor---the localization method that relatively moves based on bluetooth of design.
Summary of the invention
The technical problem to be solved in the present invention, be to provide a kind of localization method that relatively moves based on the bluetooth equipment name, solves the existing position fixing process that relatively moves loaded down with trivial details, the high problem of cost.
The present invention is achieved in that
A kind of localization method that relatively moves based on the bluetooth equipment name, comprise the steps:
Step 10, the bluetooth equipment name is divided into to grouping information field and information field field, packet numbering information is write in the grouping information field of self bluetooth equipment name;
Step 20, when the scan period starts, empty the information field field in self bluetooth equipment name, according to the corresponding relation of default bluetooth equipment information and information field field, self bluetooth equipment information is write to the information field field in self bluetooth equipment name;
Bluetooth equipment around step 30, the scanning of use bluetooth, bluetooth equipment name around obtaining;
The bluetooth equipment name that around step 40, selection, in the bluetooth equipment name, the grouping information field is described packet numbering information, be designated as this group bluetooth equipment name;
Step 50, according to described corresponding relation, extract this group bluetooth equipment information in the information field field of this group bluetooth equipment name, this group bluetooth equipment information is added in the information field field of self bluetooth equipment name;
Step 60, judge whether the scan period finish, if the scan period also finishes,, after this interval scan time finishes, return to step 30;
If step 70 scan period finishes, the bluetooth equipment information around extracting that the information field field of self bluetooth equipment name comprises.
Further, in step 20, described default corresponding relation is specially the figure place of the sequencing of arranging according to the bluetooth equipment information in grouping, if there is this equipment, at the inverse of the binary expression formula of information field field, the binary digit of above-mentioned figure place is designated as 1;
This group bluetooth equipment information in the information field field of this group of the extraction bluetooth equipment name in step 50, the concrete steps of this group bluetooth equipment information being added in the information field field of self bluetooth equipment name are: the information field field of the information field field of this group bluetooth equipment name and self bluetooth equipment name is carried out after the binary system exclusive disjunction being recorded to again in the information field field of self bluetooth equipment name.
Further, between described step 50 and step 60, further comprising the steps of:
Self bluetooth equipment name before having added self bluetooth equipment name after this group facility information and having added is compared, if equate, the next interval scan time is lengthened, otherwise, by next interval scan time shorten.
Further, wherein the next interval scan time is lengthened and is specially one times of lengthening, wherein next interval scan time shorten is specially and shortens half.
Further, between described step 50 and step 60, further comprising the steps of:
If the bluetooth equipment information that self the bluetooth equipment name after adding comprises has comprised the bluetooth equipment information in default all groupings, no longer scanning in this scan period.
Further, in arbitrary step of step 60, increase following steps: this interval scan time is added to a random time in step 30.
Further, described random time is-12 seconds to+12 seconds.
The present invention has following advantage: utilize a kind of so cheap, simple mode of bluetooth equipment name to communicate alternately, can realize mobile subscriber's relative position is positioned and follows the tracks of, the prior art this respect is almost blank.The Bluetooth transmission data can be suitable for various occasions, no matter indoor or outdoor, not based on specific infrastructure as base station, WAP (wireless access point).Bluetooth module is very cheap, and a large amount of mobile devices all carry bluetooth module, thereby are easy to the realization of system.Bluetooth transmission is free, and the user does not need the outer communication cost of amount paid.Information exchange is crossed the bluetooth equipment name and is transmitted, and does not need to connect in advance, and can save the cost that maintains connection.By the adjustment to the bluetooth equipment interval scan time, thus the energy consumption of saving mobile device.
The accompanying drawing explanation
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
The application scenarios schematic diagram that Fig. 1 is the inventive method one embodiment;
The implementor name that Fig. 2 is the inventive method one embodiment is cut apart schematic diagram;
Fig. 3 is that the present invention saves the method flowchart that plant capacity consumes;
The system construction drawing that Fig. 4 is one embodiment of the invention.
Embodiment
The present invention is directed to the application with the location that relatively moves, proposed the solution based on bluetooth equipment.For the convenience of setting forth, the present invention first defines two titles.The first " member ", it refers to the mobile subscriber that need to be positioned or follow the tracks of, old man or student as previously mentioned.It two is " with reference to persons ", and it refers to the mobile subscriber of the members reference that need to be positioned or follow the tracks of, as previously mentioned guide or teacher.The member can have a plurality of, with reference to the person, also can have a plurality ofly, for the convenience of setting forth, in embodiments of the invention, with a plurality of members and an example with reference to the person, need to indicate, and according to the present invention, is easy to be generalized in a plurality of application with reference to the person.
In the present invention, all mobile subscribers carry the equipment with bluetooth module, and this can be the portable appliances such as smart mobile phone, PDA (personal digital assistant), notebook computer, and bluetooth equipment is arranged to " can be searched " pattern.Each bluetooth equipment has an implementor name, and according to the agreement of bluetooth international norm, this name one has 248 bytes.The bluetooth equipment name can arbitrarily be arranged by the user, and effect is to find it to connect to set up bluetooth for the ease of bluetooth equipment on every side, as transfer files.The present invention utilizes the name of bluetooth equipment to carry out propagation data between bluetooth equipment, that is to say, the present invention carries out specifically encoding to realize the information interaction between bluetooth equipment to the name of bluetooth equipment.Specifically, in the time of the bluetooth equipment around a bluetooth equipment scanning, it just can obtain the information of bluetooth equipment on every side, simultaneously, it can the information of these new collections together with self information together recompile to the device name of oneself, when it is arrived by other device scan, its information has also just been blazed abroad like this.By the mode of this transmission of information, these bluetooth equipments have formed the mobile network of a multi-hop just.The member can perceive oneself whether around reference person, with reference to the person also can the perception member whether around own.
The present invention will be divided into the cycle one by one the time, and each cycle becomes takes turns, and the length in this cycle can arrange as required, and generally take minute is unit, to the application of time-sensitive, can arrange shorter.As the cycle is set to 10 minutes, just explanation can know that with reference to the person whether the member who is positioned is movable around oneself in nearest 10 minutes.
(concrete how many positions can be according to security needs by the some positions in the implementor name of oneself for each mobile device on the same group, figure place is more, more be not easy be cracked and disturb, what our example adopted is 8) be set to the grouping information field, write in advance in this field and only have the grouping information (Group_ID) that in group, personnel just know, field remaining in implementor name is as the information field field, is used for the information (Payload) of this group equipment around encoded recording.Like this by the grouping information of grouping information field, whether when obtaining on every side the bluetooth equipment name, telling is the bluetooth equipment name of this group, the interference of having avoided other bluetooth equipment name to locate this group bluetooth equipment.The grouping information field also can be used as the cipher authentication of security consideration, avoids illegal equipment to get the locating information of this group equipment.
Each takes turns the cycle at first, each mobile device is by the information zero clearing of other recorded mobile devices, then start bluetooth module according to certain algorithm (having a detailed description in following embodiment) and scan mobile device on the same group on every side, then the mobile device information of this group found is gone in the implementor name of oneself together with the own information recording carried itself, when other equipment finds it like this, the information of other equipment that also it can be found finds in the lump.When each takes turns end cycle, with reference to the person can according to the own information that record within a cycle know which member in this cycle own on every side or which member not around oneself.
Because the energy comparison of mobile device is limited, and the scan operation of bluetooth equipment is the operation of consuming energy most in the present invention, therefore the present invention has also designed the algorithm of an energy efficient, automatically regulate the interval of inquiry with the information according to inquiring, reduce as much as possible the number of times of bluetooth equipment scanning to save energy.Main thought is: the information of the surrounding devices newly found when bluetooth equipment before this and during no record, illustrates that the user who holds this equipment may move more active, and we increase the frequency of its scanning; If all recorded before this otherwise newly scan the facility information obtained, illustrate that this user moves inactive, we reduce the frequency of its scanning.(method details back further describes).
Below in conjunction with embodiment, method of the present invention is elaborated.
An application scenarios in one embodiment as shown in Figure 1, in this application scenarios, has 1 with reference to person and 4 members, as shown in the figure, with reference to the person, can find member B at present, also can find member A by member B, but can not find member C and D, and C and D can find mutually the other side.When any one among C and D (supposing C) moves to reference near person's (Bluetooth transmission distance in, general 10 meters left and right), with reference to the person, just can know that C and D are in oneself on every side, because C has carried the information of D with it.Below will describe this process that how to realize in detail.
As shown in Figure 2, be the coded system of the present embodiment bluetooth equipment name.The bluetooth equipment name is divided into to grouping information field and information field field, bluetooth equipment name one has 248 bytes, 8 of the fronts of implementor name byte is used as the grouping information field, write grouping information (Group_ID) on this field, the grouping information field is in the present embodiment: 0xfdfdfdfdfdfdfdfd is 0xfdfdfdfdfdfdfdfd with reference to the grouping information field of person, A, B, C, D.240 remaining bytes, as the information field field, are used for writing this group bluetooth equipment information (Payload).Certainly, in other embodiments, longer grouping information field can be set as required, as by front 48 byte representation grouping information fields, 200 remaining bytes are as the information field field.
In the present embodiment, when the scan period starts, empty the information field field, according to the corresponding relation of default bluetooth equipment information and information field field, self bluetooth equipment information is write to the information field field in self bluetooth equipment name.The figure place that the corresponding relation of bluetooth equipment information and information field field is the sequencing arranged according to the bluetooth equipment information in grouping, if there is this equipment, at the inverse of the binary expression formula of information field field, the binary digit of above-mentioned figure place is designated as 1.Concrete being achieved in that to each member in group with reference to the person distributes a unique sequence number, this sequence number distributes in order since 1, as reference person is designated as No. 1, A is designated as No. 2, B is designated as No. 3, C is designated as No. 4, and D is designated as No. 5, and this distribution list is prestored in each bluetooth equipment.If there is this equipment, at the inverse of the binary expression formula of information field field, the binary digit of above-mentioned figure place is designated as 1, the information field field of each equipment 5 binary systems of inverse of binary expression formula be used for meaning whether above-mentioned equipment is scanned.For each equipment, due to own, concerning own, certainly can scan,, when each cycle starts, after emptying information field information, in each facility information territory field, should on the corresponding position of oneself, write 1.For reference person, when every cycle of taking turns starts, five of the inverses of its initial information territory field are designated as 00001, A be 00010, B be 00100, C be 01000, D be 10000.240 bytes of information field field represent 1920 positions (bits), and therefore bluetooth equipment of each correspondence can support 1920 bluetooth equipments.
Can use bluetooth scanning bluetooth equipment on every side, bluetooth equipment name around obtaining; Around selecting in the bluetooth equipment name grouping information field be 0xfdfdfdfdfdfdfdfd, be designated as this group bluetooth equipment name.After scanning, the information field field of the information field field of this group bluetooth equipment name and self bluetooth equipment name is carried out after the binary system exclusive disjunction being recorded to again in the information field field of self bluetooth equipment name.As reference person can scan A, because the initial value of A is 00010, with reference to initial value itself, be 00001, carrying out after exclusive disjunction is 00011, and this 00011 is recorded in the implementor name of self, result 00011 show around scanning to have with reference to and A.C can scan D's, and the initial value that is 01000, D due to the initial value of C is 10000, and C scans after D and carries out exclusive disjunction and obtain 11000.Realize information updating between equipment by an OR operation in the present embodiment, effectively simple.
In other embodiments, the method for salary distribution can be organized interior verbal contract, also can take other methods of salary distribution.In other embodiments, can regard each byte in 240 bytes as a numeral from 0-9, these 240 bytes can mean one from 0 to (10 altogether like this
240-1) numeral, we are converted into this numeral in binary mode and mean.In this binary number, by equipment in each corresponding group, corresponded manner is the sequence number according to equipment, and such as sequence number is i, the i position started from binary low level is exactly the corresponding position of this equipment.Specific implementation is such, and the beginning of taking turns at each, be set to 1 by information bit, the i position that then this information bit moved to left, and i is exactly the sequence number that this equipment is corresponding.Only having like this this correspondence position is 1, and other positions are all 0.Our specified states 1 means to have found the equipment of this correspondence, is that 0 expression is not found.In group when a device scan around obtaining after equipment, only need simply the information bit of newfound implementor name and the information bit of oneself to be done to an OR operation, then result is saved in the grouping information field, is designated as new information bit (Payload) and gets final product.Use this coded system, can support log
2(10
240-1)=787 mobile subscribers, this can be applicable to the demand of most mobile groups.
Judge whether the scan period finish, if the scan period also finishes,, after this interval scan time finishes, continue to start scanning.If the scan period finishes, the bluetooth equipment information around extracting that the information field field of self bluetooth equipment name comprises.Multiple-Scan by one scan in the cycle, just can get with reference to all bluetooth equipment information around the person.
In the scanning for the first time of a scan period, A sweep obtains information field field 00110 to B, and B scans A and obtains 00111 with reference to the person, scans B with reference to the person and obtains 00101, C scanning D and obtain 11000, D scanning C and obtain 11000.In scanning, owing to being 00111 in B, with reference to the person, again scanning B and obtain 00111 for the second time, with reference to the person, also known A nearby.During afterwards certain once scans, C has moved to the scope that can scan with reference to the person, with reference to the person, scans C and obtains 11111, and in the group, all equipment all is not referenced person scanning and obtains, with reference to person's no longer scanning in this scan period.
All devices, before operation, need to carry out clock synchronous, to guarantee last round of data, can not be brought to next round.Method of the present invention can not need very accurate clock synchronous, to allow all mobile devices start (the namely end in last round of cycle) last second in every cycle of taking turns and can not scan in latter one second, then only the clock synchronous of all devices need to be got final product within 1 second to error, owing to every, taking turns the cycle at first, equipment can be reset the information field field of oneself, last round of data with regard to not can by other device scans to and bring next round into.
Fig. 3 is the concrete grammar in each scan period, and the method is introduced exponential backspace mechanism.The initial single interval scan time is a smaller value (as 20 seconds), usually can be set to 50 seconds.Each cycle at first, every an interval scan time time device run-down, the information field field of newfound equipment and own information field field are carried out to one or operation, then result is updated in the information field field of oneself, if new information field field equals (2
n-1) illustrate that this equipment has found equipment in all groups within this cycle, therefore will no longer scan within this cycle.Fresh information territory field equates with the information field field before scanning else if, illustrate that this scanning, without new discovery, increases its sweep spacing and is twice (can not surpass the scan period), otherwise found new equipment, illustrate that this user is more active, its sweep spacing is reduced to one times.Move according to the user situation of enlivening by the method and come self adaptation to regulate sweep spacing, the fallback mechanism of introducing can greatly reduce the consumption of energy.
Therefore in scanning, be can not found by other bluetooth equipments due to bluetooth equipment, will avoid equipment to scan simultaneously as far as possible, the way that the present invention takes be to add that one between the random time of-12 seconds to+12 seconds the time of scanning at every turn.
A system construction drawing as shown in Figure 4, this system configuration has realized a system prototype based on C# language on the windows of Microsoft mobile6.0 platform.In fact, our system can be transplanted on any platform, because we use, is all the most basic operation of bluetooth equipment.This prototype is divided 3 modules, scanning algorithm module, scan module, data module.The scanning algorithm module is responsible for determining when scan according to historical data; Scan module is responsible for controlling bluetooth module and is completed scan operation, and upgrades the grouping information field, and the data that simultaneously will newly scan preserve with document form by data module, think that the scanning algorithm module provides data, is convenient to algorithm for design.
If the equipment around bluetooth equipment scanning, illustrate that this bluetooth equipment can be used as a medium of communicating by letter between the member, and, for the member, the bluetooth equipment that they hold not necessarily requires to scan other equipment, they can be passive being found by other equipment.Because if need the words of bluetooth equipment scanning, need to install control software on equipment, and not all bluetooth equipment can mounting software, system of the present invention is also supported these equipment, because only need to change their implementor name, does not need them to carry out extra operation.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present invention; those of ordinary skill in the art are in modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (7)
1. the localization method that relatively moves based on the bluetooth equipment name, is characterized in that: comprise the steps:
Step 10, the bluetooth equipment name is divided into to grouping information field and information field field, packet numbering information is write in the grouping information field of self bluetooth equipment name;
Step 20, when the scan period starts, empty the information field field in self bluetooth equipment name, according to the corresponding relation of default bluetooth equipment information and information field field, self bluetooth equipment information is write to the information field field in self bluetooth equipment name;
Bluetooth equipment around step 30, the scanning of use bluetooth, bluetooth equipment name around obtaining;
The bluetooth equipment name that around step 40, selection, in the bluetooth equipment name, the grouping information field is described packet numbering information, be designated as this group bluetooth equipment name;
Step 50, according to described corresponding relation, extract this group bluetooth equipment information in the information field field of this group bluetooth equipment name, this group bluetooth equipment information is added in the information field field of self bluetooth equipment name;
Step 60, judge whether the scan period finish, if the scan period also finishes,, after this interval scan time finishes, return to step 30;
If step 70 scan period finishes, the bluetooth equipment information around extracting that the information field field of self bluetooth equipment name comprises.
2. a kind of localization method that relatively moves based on the bluetooth equipment name according to claim 1 is characterized in that: in step 20:
Described default corresponding relation is specially the figure place of the sequencing of arranging according to the bluetooth equipment information in grouping, if there is this equipment, at the inverse of the binary expression formula of information field field, the binary digit of above-mentioned figure place is designated as 1;
This group bluetooth equipment information in the information field field of this group of the extraction bluetooth equipment name in step 50, the concrete steps of this group bluetooth equipment information being added in the information field field of self bluetooth equipment name are: the information field field of the information field field of this group bluetooth equipment name and self bluetooth equipment name is carried out after the binary system exclusive disjunction being recorded to again in the information field field of self bluetooth equipment name.
3. the localization method that relatively moves based on the bluetooth equipment name according to claim 1 is characterized in that: between described step 50 and step 60, further comprising the steps of:
Self bluetooth equipment name before having added self bluetooth equipment name after this group facility information and having added is compared, if equate, the next interval scan time is lengthened, otherwise, by next interval scan time shorten.
4. the localization method that relatively moves based on the bluetooth equipment name according to claim 3, is characterized in that: wherein the next interval scan time is lengthened and is specially one times of lengthening, wherein next interval scan time shorten is specially and shortens half.
5. the localization method that relatively moves based on the bluetooth equipment name according to claim 1 is characterized in that: between described step 50 and step 60, further comprising the steps of:
If the bluetooth equipment information that self the bluetooth equipment name after adding comprises has comprised the bluetooth equipment information in default all groupings, no longer scanning in this scan period.
6. according to the arbitrary described localization method that relatively moves based on the bluetooth equipment name of claim 1 to 5, it is characterized in that: in step 30, in arbitrary step of step 60, increase following steps: this interval scan time is added to a random time.
7. the localization method that relatively moves based on the bluetooth equipment name according to claim 6, it is characterized in that: described random time is-12 seconds to+12 seconds.
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| CN104158570A (en) * | 2014-09-01 | 2014-11-19 | 厦门美图移动科技有限公司 | Method for rapidly transmitting information through Bluetooth |
| CN106485881A (en) * | 2015-08-26 | 2017-03-08 | 中兴通讯股份有限公司 | A kind of method and device of wireless network emergency alarm |
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