CN101754435A - Terminal location method applicable to wireless local area network (WLAN) - Google Patents
Terminal location method applicable to wireless local area network (WLAN) Download PDFInfo
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- CN101754435A CN101754435A CN201010034551A CN201010034551A CN101754435A CN 101754435 A CN101754435 A CN 101754435A CN 201010034551 A CN201010034551 A CN 201010034551A CN 201010034551 A CN201010034551 A CN 201010034551A CN 101754435 A CN101754435 A CN 101754435A
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Abstract
The invention discloses a terminal location method applicable to a wireless local area network (WLAN). In an extended service area of the WLAN at least comprising a location server, the method at least comprises the following steps that: a user terminal or a client application end initiates a location service request to a location server; after receiving the request of the location server, the user terminal detects identifier information and signal intensity of all possible access points (AP); the user terminal sends a detected list of the identifier information and signal intensity of AP to the location server; after receiving the list, the location server calculates to obtain the location information of the user terminal; and finally, the location server returns the obtained location information to an object which initiates the location information request initially, namely, the user terminal or the client application end. The user terminal location method provided by the invention can locate the user terminal simply and fast without the need of modifying a wireless local area network protocol.
Description
Technical field
The present invention relates to a kind of localization method, belong to wireless communication field, particularly the WLAN technical field user terminal based on the WLAN technology.
Background technology
WLAN (wireless local area network) WLAN is a kind of high-speed radio IP network communication technology that grows up for 20 end of the centurys, and it is a kind of based on the 802.11b/a standard, the technology that can provide high speed wireless data to insert in more among a small circle.WLAN has two kinds of networking modes: reciprocity networking and basic schema networking.The equity networking does not need AP, communicates with one another between all wireless terminals (STA); The basic schema networking then needs WAP (wireless access point), and all signals that wireless terminal sends and data all will send to AP earlier, are transmitted to the purpose terminal by AP then.At present, a kind of networking model in back is more common in WLAN.
Wireless location technology produces for the navigation request that satisfies long-range navigation at first, extensive use along with WLAN (wireless local area network) and mobile communication technology, for more colourful service is provided to the user, operator is constantly releasing new business, wherein some new business is exactly to obtain required user's current location information, promptly the active user is positioned, typical application comprises: for the user provides the surrounding enviroment information inquiry, location or tracking special objective, path navigation, location-based recreation etc.
With regard to technological means, wireless location technology mainly comprises gps satellite location technology, mobile cellular network location technology, WLAN location technology and RFID location technology etc.In recent years along with the rise of WLAN, it is as broadband access scheme and the complementary developing state that merges of 3G, and the popularizing of portable terminal of supporting WLAN, and has also caused the extensive concern of Chinese scholars based on the wireless location technology of WLAN.
The WLAN location technology is meant in WLAN to go out the position at testee place according to specific algorithm computation by some parameters that receive are analyzed.The WLAN transmission rate is fast, capacity is big, coverage is little, has only tens meters, compares the mobile cellular network location technology, can access higher positioning accuracy.For this reason, how effectively utilizing the characteristics of WLAN (wireless local area network) self to come the design terminal localization method, is the problem that needs solution.
Summary of the invention
The object of the present invention is to provide a kind of method of locating terminal that is applicable to WLAN (wireless local area network) WLAN, user terminal is located fast and effectively realizing easily.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of locating terminal that is applicable to WLAN (wireless local area network) WLAN, in the expansion service district of the WLAN (wireless local area network) that comprises a location-server at least, this method comprises the steps:
Step 1, user terminal or application client terminal are initiated request for location services to location-server;
After step 2, user terminal received the request of location-server, this user terminal detected the signal strength signal intensity of identification information and the AP of all possible access point AP;
Step 3, this user terminal will detect the identification information of AP and the signal strength list of AP is sent to location-server;
After step 4, this location-server receive the tabulation of described user terminal transmission, calculate the positional information of user terminal;
Step 5, this location-server return to the positional information of gained object, user terminal or client's application end of initial initiation position information of user's terminal request.
Before the step 1, can directly or carry out data via WLAN (wireless local area network) and transmit between described user terminal and the described location-server as mentioned above.
Described access point identity information is the sign of each access point in expansion service district of unique identification.
Before the step 1, described location-server carries out record to the identification information of all AP of this service area and the corresponding relation of positional information as mentioned above.
In the step 2, detect the signal strength signal intensity of identification information and the AP of all possible AP by described user terminal as mentioned above.
As mentioned above in the step 2, when described user terminal detects the signal strength signal intensity of the identification information of all possible AP and AP, set the time of a detection, if official hour does not detect AP, then detect failure, position fixing process finishes; Otherwise carry out described step 3 immediately.
As mentioned above in the step 4, after location-server receives the tabulation that described user terminal sends, and, adopt following algorithm to obtain the positional information of user terminal according to identification information and the positional information of the AP of storage in advance:
If only contain the signal strength signal intensity of identification information and the AP of an AP in the described tabulation, then the positional information of described AP is the position of user terminal;
If contain the signal strength signal intensity of identification information and the AP of two or more AP in the described tabulation, be that the center of circle, the corresponding propagation distance of AP signal strength signal intensity are radius with each AP respectively then, signal strength signal intensities such as work circles, get each etc. the signal strength signal intensity circle center of occuring simultaneously as the position of user terminal; Wherein, be meant that etc. the signal strength signal intensity circle the more any signal strength signal intensity of AP on this circle all equates.
The invention provides a kind of method of locating terminal that is applicable to WLAN (wireless local area network) WLAN, have following advantage and characteristics:
1) this method is to be collected the signal strength signal intensity of identification information and the AP of AP by user terminal, sends it to location-server then, according to the signal strength signal intensity of AP and the positional information of AP, calculates the position of user terminal by location-server.
2) coverage of wireless local network connecting point is generally 20～100 meters, under opposite extreme situations, when promptly user terminal only detects an AP, also can be positioned at the user in 20～100 meters the accuracy rating.
3) user terminal of WLAN (wireless local area network) itself has the ability that detects AP, thereby need not WLAN terminal device and AP are made amendment, and realizes simple and convenient.
Description of drawings
Fig. 1 is that system of the present invention forms structure chart;
The basic handling flow chart of Fig. 2 among the present invention user terminal being positioned;
Fig. 3 is for realizing the embodiment schematic diagram of user terminal location among the present invention;
Fig. 4 calculates the principle schematic of user terminal location for location-server among the present invention.
Embodiment
The present invention will be described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, Fig. 1 is that system of the present invention forms structured flowchart, and described system mainly comprises terminal, AP and location-server.
Described terminal has following basic function: 1) and between the location-server can directly or carry out data via WLAN (wireless local area network) and transmit; 2) accept the Location Request of location-server; 3) detect the identification information of the possible AP of institute and the signal strength signal intensity of AP; 4) identification information of detected AP and the signal strength list of AP are sent to location-server.
Described location-server has following basic function: the request for location services of 1) accepting systems such as user terminal or client's application end; 2) store the database of the corresponding relation of the identification information of AP and positional information; 3) calculate the position of user terminal according to the signal strength list of the identification information of AP and AP; 4) restoring to normal position is replied the terminal to the request of sending.
As shown in Figure 2, Fig. 2 is the basic handling flow chart of the method for locating terminal that is applicable to WLAN (wireless local area network) of the present invention's proposition, and its treatment step is as follows:
Step 1, need learn the positional information of certain user terminal when client's application end, or user terminal is need learn self-position information the time, this client's application end or user terminal are initiated request for location services to location-server, location-server receives and handles this request, and whether for example, differentiating this request is request for location services, whether have the authority of learning this position information of user's terminal etc., location-server is sent to this user terminal with Location Request then if differentiating user terminal or client's application end;
Step 2 after this user terminal receives the request of location-server, begins to detect the signal strength signal intensity of identification information and the AP of all possible access point AP, set the time of a detection simultaneously, if official hour does not detect AP, then detect failure, position fixing process finishes; Otherwise carry out described step 3 immediately;
Step 3, this user terminal is sent to location-server with the identification information of detected AP and the signal strength list of AP;
After step 4, this location-server receive the tabulation of described user terminal transmission, calculate the positional information of user terminal;
Step 5, this location-server returns to initial initiation position information of user's terminal request system with the positional information of gained, if the request that user terminal self sends, then location-server returns to user terminal with the positional information of gained; If the request that client's application end is initiated, then location-server sends to client's application end with the positional information of gained.
Described location-server is according to identification information and the positional information of the AP that stores in advance, and the method for the position of calculating user terminal is as follows:
If only contain the signal strength signal intensity of identification information and the AP of an AP in the described tabulation, then the identification information with AP in the tabulation is an index, the identification information of the AP that the Search and Orientation server is stored in advance and positional information, the positional information of gained AP is the position of user terminal;
If contain the signal strength signal intensity of identification information and the AP of two or more AP in the described tabulation, be that the center of circle, the corresponding propagation distance of AP signal strength signal intensity are radius with each AP respectively then, signal strength signal intensities such as work circles, get each etc. the signal strength signal intensity circle center of occuring simultaneously as the position of user terminal; Wherein, be meant that etc. the signal strength signal intensity circle the more any signal strength signal intensity of AP on this circle all equates.
Analyze using method of the present invention with a typical embodiment below.
As shown in Figure 3, in comprising the expansion service district ESS of a location-server, there are access point AP1, AP2, AP3 and AP4, user terminal A and client's application end.In the location-server identification information of AP1, AP2, AP3 and four access points of AP4 and the corresponding relation of positional information are carried out record, described identification information is the sign of each access point in the unique identification ESS.Can directly or carry out data via WLAN (wireless local area network) and transmit between user terminal and the described location-server.
When client's application end need be learned the positional information of described terminal A, initiate request for location services to location-server; After this terminal A receives the Location Request of location-server, begin to detect might AP identification information and the signal strength signal intensity of AP, in this example, terminal A can only detect AP1 and AP2; This terminal A will comprise the tabulation of AP1, AP2 identification information and signal strength signal intensity and send to location-server; The position that location-server calculates described terminal A according to this tabulation; At last, location-server returns to the system that initiates Location Request with the positional information of described terminal A, and in the present embodiment, what initiate request for location services is client's application end.
When described terminal A detects the signal strength signal intensity of identification information that institute might AP and AP, set the time of a detection, if official hour does not detect AP, then detect failure, the position fixing process end; Otherwise continue to carry out following step.
Comprise two access points of AP1 and AP2 in the identification information of the described AP that described terminal A returns and the signal strength list of AP, location-server calculates described terminal A according to this tabulation the method for position is as follows: with the corresponding propagation distance of the signal strength signal intensity of AP1 be R
1, with the corresponding propagation distance of the signal strength signal intensity of AP2 be R2, as shown in Figure 4, be the center of circle, R with AP1
1Justify for radius, be designated as round C
AP1, be the center of circle with AP2, R
2Justify for radius, be designated as round C
AP2, circle C
AP1With circle C
AP2Meet at A, B 2 points, get the position of the mid point P of A, 2 lines of B as described terminal A.
Need to prove circle C
AP1With circle C
AP2The signal strength signal intensity circle such as be, promptly the circle signal strength signal intensity that goes up arbitrarily any all equates.
It should be noted last that the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1. a method of locating terminal that is applicable to WLAN (wireless local area network) WLAN is characterized in that, in the expansion service district of the WLAN (wireless local area network) that comprises a location-server at least, this method comprises the steps:
Step 1, user terminal or client's application end are initiated request for location services to location-server;
After step 2, user terminal received the request of location-server, this user terminal detected the signal strength signal intensity of identification information and the AP of all possible access point AP;
Step 3, this user terminal will detect the identification information of AP and the signal strength list of AP is sent to location-server;
After step 4, this location-server receive the tabulation of described user terminal transmission, calculate the positional information of user terminal;
Step 5, this location-server return to the positional information of gained object, user terminal or the application client terminal of initial initiation position information of user's terminal request.
2. localization method according to claim 1 is characterized in that, before the described step 1, can directly or carry out data via WLAN (wireless local area network) and transmit between described user terminal and the described location-server.
3. localization method according to claim 1 is characterized in that, described access point identity information is the sign of each access point in expansion service district of unique identification.
4. localization method according to claim 1 is characterized in that, before the described step 1, described location-server carries out record to the identification information of all AP of this service area and the corresponding relation of positional information.
5. localization method according to claim 1 is characterized in that, in the described step 2, is detected the signal strength signal intensity of identification information and the AP of all possible AP by described user terminal.
6. localization method according to claim 1, it is characterized in that, in the described step 2, when described user terminal detects the signal strength signal intensity of the identification information of all possible AP and AP, set the time of a detection, if official hour does not detect AP, then detect failure, position fixing process finishes; Otherwise carry out described step 3 immediately.
7. localization method according to claim 1, it is characterized in that, in the described step 4, after location-server receives the tabulation of described user terminal transmission, and, adopt following algorithm to obtain the positional information of user terminal according to the identification information and the positional information of AP of storage in advance:
If only contain the signal strength signal intensity of identification information and the AP of an AP in the described tabulation, then the positional information of described AP is the position of user terminal;
If contain the signal strength signal intensity of identification information and the AP of two or more AP in the described tabulation, be that the center of circle, the corresponding propagation distance of AP signal strength signal intensity are radius with each AP respectively then, signal strength signal intensities such as work circles, get each etc. the signal strength signal intensity circle center of occuring simultaneously as the position of user terminal; Wherein, be meant that etc. the signal strength signal intensity circle the more any signal strength signal intensity of AP on this circle all equates.
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| CN102075353A (en) * | 2010-12-29 | 2011-05-25 | 北京星网锐捷网络技术有限公司 | Mobility management method of working station and network management server |
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| CN102348258A (en) * | 2011-10-12 | 2012-02-08 | 北京百度网讯科技有限公司 | Mobile terminal positioning method and device |
| CN102821355A (en) * | 2012-05-15 | 2012-12-12 | 扬州易游物联网络科技有限公司 | Simple method for positioning users by wireless local area network |
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Application publication date: 20100623 |