CN101119390A - Wireless terminal locating method, system and device - Google Patents
Wireless terminal locating method, system and device Download PDFInfo
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- CN101119390A CN101119390A CNA2007101456007A CN200710145600A CN101119390A CN 101119390 A CN101119390 A CN 101119390A CN A2007101456007 A CNA2007101456007 A CN A2007101456007A CN 200710145600 A CN200710145600 A CN 200710145600A CN 101119390 A CN101119390 A CN 101119390A
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Abstract
The invention discloses a positioning method of wirless terminal. AP is accessed into network by the a wireless controller. The positioning method includes the following steps: after the wireless terminal is accessed into the network by the wireless terminal, AC notifies at least an AP near the accessing AP to supervise the wireless terminal; AC receives the information of the wireless terminal which is collected by the neighbor AP, and reports the information to the positioning server; the positioning server positions the wireless terminal according to the information of the wireless terminal. The present invention can make the positioning testing to the wireless terminal by harmorizing a plurality of the APs, to get the enough positioning information, finally realize the accurate positioning of the wireless terminal in the centralizing WLAN network.
Description
Technical field
The present invention relates to network communications technology field, particularly relate to a kind of localization method, system and device of wireless terminal.
Background technology
Along with popularizing of network, WLAN (Wireless Local Area Network, WLAN (wireless local area network)) arises at the historic moment, and it is a kind of without the continuous LAN of cable apparatus.WLAN (wireless local area network) is to utilize electromagnetic wave to transmit and receive data, and need not cable medium.It is a kind of important supplement and expansion to cable network, makes the computer of networking have mobility, can solve quickly and easily to adopt wired access to be difficult for the network-in-dialing problem that realizes.WLAN provides a kind of wireless connections service of local area network (LAN), and it can provide wireless data access at a high speed in small range, is one of relatively more popular technology of present IT industry, also is popular wireless access way.AP (access point, WAP (wireless access point)) is an important composition equipment of WLAN (wireless local area network), be a wireless transmitting-receiving equipments--will become wireless signal to send from the data transaction that cable network (for example Internet) receives, the wireless signal that receives is converted to data and is forwarded to cable network.Along with wireless wlan network is used gradually widely, can the user also considering and realize obtaining more benefits by wlan network.Wireless terminal has been broken away from the constraint of fixed network, is free to move and not traffic affecting use in whole wlan network.But, then wish to judge accurately the particular location of current wireless terminal as Network Management person.
In the application of many reality, for example medical treatment, the orientation management of respective resources also can be realized by terminal use's location mechanism of WLAN in colliery, prison etc.Prior art has proposed a kind of terminal use's localization method, as shown in Figure 1, is the structure chart of the concentrated wlan network of prior art supporting location location.Wherein, concentrate WLAN to be made of AP and AC (Access Controller, access controller) equipment, AC provides the centralized management of wlan network, and AP then provides the wireless access service by setting up with AC after link adds wlan network.Because in the concentrated wlan network of access controller AC management, a plurality of wireless access point AP are common forms a wlan network, and by the unified management of AC to AP, can wireless terminal be positioned according to the network topology of WLAN.Location-server calculates the topology location of wireless terminal according to the topology of the current wlan network that has obtained.
As shown in Figure 1, comprise 5 AP in this WLANN service network, between adjacent AP, produce channel confliction, improve service quality, the identical channel of can not working between the then adjacent AP.With the 802.11g agreement is example, and AP1 and AP4 can be operated in channel 1, and AP2 is operated in channel 6 and AP3 is operated in the channel 11, and the AP5 working channel is all different with AP1, AP2 and AP3.Wireless terminal 1 is in the time can receiving the information of a plurality of AP, because the AP1 signal is more intense, can provide better WLAN service, and then wireless terminal 1 can be selected to be linked in the wlan network by AP1.After wireless terminal 1 successfully was linked into wlan network by AP1, location-server just began this wireless terminal is carried out location positioning.
Usually carrying out when wlan network disposes, the position of all AP is fixing, so the topology of the location-server current wlan network that just can obtain, and location-server just can be according to the topology location of these wireless terminals of judgement such as signal strength signal intensity like this.
But the identical channel (as AP1 and AP2) owing to can not work between the adjacent AP in the prior art, and distance often distant (as AP1 and AP4) between two AP that use same channels.Because AP2, AP3 are different with the channel of wireless terminal work, thus the information of this wireless terminal can't be obtained, so location-server can only carry out location positioning to this wireless terminal according to AP1 or AP4.Location-server can only provide the locating area of a circumference type around certain independent AP, can't accurately locate wireless terminal.As shown in Figure 2, the wireless terminal position administrative division map of determining for the single access point of prior art.In the network that last figure describes, AP1 can provide the information of wireless terminal 1; If AP4 also can receive the message of wireless terminal 1 in addition, then AP4 also can provide the information of wireless terminal 1; But because the AP4 distance is far away, and AP2 is different with the channel of wireless terminal work with AP3, and therefore the information of wireless terminal all can't be provided for location-server, accurately locatees.
In realizing embodiment of the invention process, the inventor finds that there are the following problems at least in the prior art: though network has adopted the mode of centralized management that WLAN is provided access service, the AP resource that but can't make full use of among the WLAN when carrying out wireless location is carried out network positions.Because planning needs according to wlan network, contiguous AP need use different channels as far as possible, therefore can only position the wireless terminal that inserts by single AP,, badly influence locating effect wireless terminal position so can't carry out accurate in locating.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of localization method, system and device of wireless terminal, with realize to wireless terminal accurately.
For achieving the above object, the embodiment of the invention proposes a kind of localization method of wireless terminal on the one hand, wireless access point AP is by wireless controller AC access network, may further comprise the steps: by after inserting the AP access network, described AC notifies at least one neighbor AP adjacent with described access AP that described wireless terminal is monitored at wireless terminal; Described AC receives the information of the described wireless terminal of described neighbor AP collection, and described information is reported location-server; Described location-server positions described wireless terminal according to the information of the described wireless terminal of receiving.
Wherein, notify after at least one neighbor AP adjacent with described access AP monitors described wireless terminal at described AC, further comprising the steps of: described neighbor AP regularly switches to the working channel of described access AP described wireless terminal is monitored.
Wherein, described neighbor AP is monitored specifically described wireless terminal and be may further comprise the steps: described neighbor AP is monitored described wireless terminal according to the MAC Address of described wireless terminal, the MAC Address of described wireless terminal by described AC from the information interaction of wireless terminal obtain and be handed down to described neighbor AP.
Wherein, after the working channel that described neighbor AP regularly switches to described access AP was monitored described wireless terminal, further comprising the steps of: described neighbor AP automatically switched to former working channel after collecting the information of described wireless terminal.
Wherein, after described AC receives the information of the described wireless terminal that described access AP and described neighbor AP collect, further comprising the steps of: described AC notifies described neighbor AP to stop monitoring to described wireless terminal.
Wherein, described neighbor AP is monitored specifically described wireless terminal and comprised: described neighbor AP is monitored multicast message or the Action message that described wireless terminal sends.
Wherein, described neighbor AP is monitored specifically described wireless terminal and comprised: described neighbor AP is determined the distance of described wireless terminal apart from described neighbor AP according to the average signal strength that described wireless terminal sends message.
Wherein, described AC notifies at least one neighbor AP adjacent with described access AP that described wireless terminal is monitored specifically and may further comprise the steps: described location-server notifies described AC to select to open the quantity of neighbor AP according to the positioning accuracy of described wireless terminal needs.
The embodiment of the invention also proposes a kind of navigation system of wireless terminal, comprise AC, location-server and at least two AP, described AP is by described AC access network, described AC links to each other with described location-server, described AC, be used for judging wireless terminal, notify at least one neighbor AP adjacent that described wireless terminal is monitored, and the information of the described wireless terminal that described neighbor AP is collected reports described location-server with inserting AP by after inserting the AP access network; Described location-server is used for according to the information of the described wireless terminal of receiving described wireless terminal being positioned.
Wherein, described AP comprises and monitors module and information reporting module, and described monitoring module is used to receive the monitoring notice of described AC, and described wireless terminal is monitored; Described information reporting module, the information that is used for the described wireless terminal collected according to described monitoring module reports described AC.
Wherein, described monitoring module comprises regularly monitors submodule and automatic switchover submodule, and submodule is monitored in described timing, is used at the working channel that the monitoring that receives described AC notifies the back regularly to switch to described access AP described wireless terminal being monitored; Described automatic switchover submodule is used for automatically switching to former working channel after collecting the information of described wireless terminal.
Wherein, described monitoring module also comprises the definite submodule of distance, is used for determining according to the average signal strength of described wireless terminal transmission message the distance of the described neighbor AP of distance of described wireless terminal.
Wherein, described AC comprises the MAC Address administration module, is used at described wireless terminal writing down the MAC Address of described wireless terminal during by described access AP access network, and when notifying described neighbor AP that described wireless terminal is monitored, described MAC Address is handed down to described neighbor AP.
Wherein, described location-server comprises neighbor AP selection module, is used for the positioning accuracy according to described wireless terminal needs, and the quantity of selecting to open neighbor AP is also notified described AC.
The embodiment of the invention also proposes a kind of AP, comprises monitoring module and information reporting module, and described monitoring module is used to receive the monitoring notice of AC, and wireless terminal is monitored; Described information reporting module, the information that is used for described wireless terminal that described monitoring module is collected reports described AC.
Wherein, described monitoring module comprises regularly monitors submodule and automatic switchover submodule, and submodule is monitored in described timing, is used at the working channel that the monitoring that receives described AC notifies the back regularly to switch to described access AP described wireless terminal being monitored; Described automatic switchover submodule is used for automatically switching to former working channel after collecting the information of described wireless terminal.
Wherein, described monitoring module also comprises the definite submodule of distance, is used for determining according to the average signal strength of described wireless terminal transmission message the distance of the described neighbor AP of distance of described wireless terminal.
The embodiment of the invention also proposes a kind of AC, comprise notice administration module and information forwarding module, described notice administration module, be used for judging that wireless terminal is by after inserting the AP access network, send the monitoring notice at least one neighbor AP adjacent with inserting AP, and after the information of receiving the described wireless terminal that described neighbor AP is collected, notify described neighbor AP to stop monitoring to described wireless terminal; Described information forwarding module, the information that is used for described wireless terminal that described access AP and described neighbor AP are collected reports described location-server.
Wherein, also comprise the MAC Address administration module, be used at described wireless terminal writing down the MAC Address of described wireless terminal during by described access AP access network, and when notifying described neighbor AP that described wireless terminal is monitored, described MAC Address is handed down to described neighbor AP.
The embodiment of the invention also proposes a kind of location-server, comprises network topology preservation module and position computation module, and described network topology is preserved module, the topology information that is used to preserve network; Described position computation module is used for according to the network topological information that the information and the described network topology of the described wireless terminal of receiving are preserved the module preservation described wireless terminal being positioned.
Wherein, also comprise neighbor AP selection module, be used for the positioning accuracy according to described wireless terminal needs, the quantity of selecting to open neighbor AP is also notified described AC.
The technical scheme of the embodiment of the invention has the following advantages, because by concentrating in the wlan network AC to the centralized control of AP, therefore when needs carry out wireless terminal location, can position detection to this wireless terminal jointly with access AP by coordinating a plurality of neighbor AP, to obtain enough information, finally realized the accurate location of wireless terminal in the concentrated wlan network.And when carrying out the wireless terminal detection, can also position detection according to the specific neighbor AP of the network topology dynamic coordinate of AP, and not need to start all neighbor AP, thereby avoid influence whole network performance.
Description of drawings
Fig. 1 is the structure chart of the concentrated wlan network of prior art supporting location location;
Fig. 2 is the wireless terminal position administrative division map that the single access point of prior art is determined;
Fig. 3 is the structure chart of navigation system of the wireless terminal of the embodiment of the invention one;
Fig. 4 is the location drawing of the location-server of the embodiment of the invention two according to the wireless terminal of the locating information calculating of three AP;
Fig. 5 is the localization method flow chart of the wireless terminal of the embodiment of the invention three.
Embodiment
The embodiment of the invention is by concentrating in the wlan network AC to the unified management of AP, thereby can be when wireless terminal be positioned, the access AP neighbor AP adjacent with inserting AP of coordinating this wireless terminal by AC positions detection to this wireless terminal jointly, finally realize the accurate location of wireless terminal in the concentrated wlan network, solved in the prior art defective that can only position wireless terminal by single AP.And because AC is to the unified management of AP, the embodiment of the invention also supports AC control neighbor AP to finish the detection and localization to wireless terminal separately, when particularly inserting AP and reaching load balancing, can finish accurate location to wireless terminal by its neighbor AP.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
As shown in Figure 3, be the structure chart of the navigation system of the wireless terminal of the embodiment of the invention one, this navigation system comprises AC11, location-server 22 and at least two AP33, and AP33 is by the AC1 access network, and described AC links to each other with described location-server.Two AP can have one as access AP, and another is as neighbor AP, has only by two or more AP jointly wireless terminal to be positioned detection, can calculate the position of this wireless terminal accurately.For the ease of understanding; following examples are that example is described with network topological diagram shown in Figure 1; but should not think that the embodiment of the invention can only be applied to structure shown in Figure 1, any equipment that can replace AC that AP is managed concentratedly also all should be embodiment of the invention protection range and contains.
In above-mentioned navigation system, AC11 is used for judging that wireless terminal is by after inserting the AP access network, notify at least one neighbor AP adjacent that this wireless terminal is monitored with inserting AP, and the information of the wireless terminal that neighbor AP is collected reports location-server 22, when neighbor AP cooperates access AP to position, the information that also needs to insert the wireless terminal that AP collects also reports location-server 22, wherein inserts AP and obtains wireless terminal information and describe in detail in background technology; Location-server 22 is used for according to the information of the wireless terminal of receiving this wireless terminal being positioned.Topological structure as shown in Figure 1, wireless terminal is by the AP1 access network, and then this AP1 inserts AP exactly, and AP2 and the AP5 adjacent with this AP1 are exactly neighbor AP.AC11 is after judging that wireless terminal inserts AP1, and need carry out location positioning to this wireless terminal, then AC11 can determine this wireless terminal near access AP (AP1), and AC11 obtains the adjacent neighbor AP information of this access AP (AP1) (AP2 and AP5) according to the network topology structure of preserving.AC11 notifies at least one neighbor AP adjacent with inserting AP that this wireless terminal is monitored, can notify AP2 or AP5 to open monitors, also can notify AP2 and AP5 jointly this wireless terminal to be monitored, therefore can monitor this wireless terminal by AP2 and AP5, also can monitor this wireless terminal by AP2 and/or AP5.Neighbor AP receive monitor notice after, switch to the working channel that inserts AP and monitor, the working channel that wherein inserts AP can be handed down to neighbor AP by AC11.Neighbor AP reports location-server 22 with the information of this wireless terminal by AC11, certainly if neighbor AP cooperation access AP finishes the detection and localization to wireless terminal, then inserting AP also needs the detection information to this wireless terminal is reported location-server 22.Location-server 22 is used for according to the information of the wireless terminal of receiving and the network topology structure of preservation this wireless terminal being positioned calculating, for example location-server 22 can obtain the positional information of this wireless terminal jointly according to AP1, AP2 and AP5 to the detection and localization information of wireless terminal, the location drawing of the wireless terminal that the location-server that is illustrated in figure 4 as the embodiment of the invention two calculates according to the locating information of three AP.As can be seen from Figure 4, the compare location drawing of the wireless terminal that prior art shown in Figure 2 calculates of the position of this wireless terminal is more accurate.
Wherein, the wireless terminal information that neighbor AP is collected comprises: the message of wireless terminal, the facility information of message intensity and this message of reception, for example ID of AP.The embodiment of the invention has proposed the multiple mode of finishing wireless terminal location by message, a kind of can be by the average signal strength of AP according to the wireless terminal message, can determine the band of position of this wireless terminal at the about x rice of distance A P1 radius, wherein x can calculate according to signal strength signal intensity and obtain, and AP only needs to report average signal strength to get final product to AC like this.Also can send special message, the position of for example special multicast message or the announcement of Action message oneself by AC specific radio terminal.AC only need be with these messages, and the facility information of the signal strength signal intensity of message and reception message sends to location-server, and location-server just can be finished the location positioning of wireless terminal.For example can use multicast message transmission locating information, can be the location message for multicast address 01-01-01-00-00-00 in the named place of destination location; All location messages all pass through 802.11 data message (specifically referring to IEEE802.11-1999) encapsulation back transmission, the destination address of this data message is multicast address 01-01-01-00-00-00, and the particular content of message can also fill or revise according to the needs of positioning service.The location message can also be encapsulated in addition in one special 802.11 the Action message and send, the Action message is a kind of 802.11 administrative message, can be by multiple application according to subtype Action message.In order to support the location of wireless terminal, can define a kind of Action message of specific type, carry concrete locating information by this Action message.
The embodiment of the invention can be coordinated neighbor AP and cooperate access AP jointly wireless terminal to be positioned detection, also can only position detection to wireless terminal separately by neighbor AP.For example insert AP and reached load balancing, and its neighbor AP is relatively more idle, at this moment AC is that the may command neighbor AP is finished the detection and localization to wireless terminal separately.Therefore the navigation system that proposes of the embodiment of the invention not only can be controlled neighbor AP, can also control and insert AP, thereby select best compound mode to finish location to wireless terminal according to the concrete condition of network.
Wherein, AC11 comprises notice administration module 111 and information forwarding module 112, notice administration module 111 is used for judging that wireless terminal is by after inserting the AP access network, send the monitoring notice at least one neighbor AP adjacent with inserting AP, and after the information of receiving the described wireless terminal that described access AP and described neighbor AP are collected, notify described neighbor AP to stop monitoring to described wireless terminal.Information forwarding module 112 is used for the information of the described wireless terminal of described access AP and the collection of described neighbor AP is reported described location-server.
Wherein, preferably, AC11 also comprises MAC Address administration module 113, be used at described wireless terminal during by described access AP access network, write down MAC Address (the MediumAccess Control of described wireless terminal, media interviews are controlled), and when notifying described neighbor AP that described wireless terminal is monitored, described MAC Address is handed down to described neighbor AP.AC11 is handed down to neighbor AP (AP2 and AP5) with the MAC Address of this wireless terminal when the unlatching of notice neighbor AP is monitored, above-mentioned MAC Address be by this wireless terminal when inserting AP (AP1) registration, access AP reports AC11's, and this MAC Address can be used as the unique identification of wireless terminal in network.Obtain the MAC Address of this wireless terminal in neighbor AP after, just can only report the information of this wireless terminal according to this MAC Address.For example the access AP (AP1) of this wireless terminal also can connect by a lot of other wireless terminals, neighbor AP (AP2 and AP5) is after switching to the working channel of AP1, not only can detect the information of this wireless terminal, can also detect the information of other wireless terminals, if this neighbor AP does not have corresponding wireless terminal MAC Address, then neighbor AP can all report AC with the information of detected all wireless terminals, select the information of needs by AC (or location-server) according to the wireless terminal MAC Address, so cause the burden of AC (or location-server); If neighbor AP has the MAC Address of this wireless terminal then the signal of other wireless terminals of listening to directly can be ignored.
Wherein, AP33 comprises monitoring module 331 and information reporting module 332, monitors the monitoring notice that module 331 is used to receive AC11, and wireless terminal is monitored; The information that information reporting module 332 is used for monitoring the described wireless terminal of module 331 collections reports AC11, is transmitted to location-server 22 by AC11.
Wherein, preferably, monitor module 331 and comprise and regularly monitors submodule 3311 and automatic switchover submodule 3312, regularly monitor the working channel that submodule 3311 is used for regularly switching in the monitoring notice back that receives AC11 described access AP wireless terminal is monitored; Automatic switchover submodule 3312 is used for automatically switching to former working channel and continues to provide service after collecting the information of wireless terminal.Monitor the positional information that submodule 3311 can regularly report wireless terminal by above-mentioned timing, location-server 22 not only can accurately be located this wireless terminal, can also calculate the movement locus of this wireless terminal.And after collection, automatically switch to former working channel by automatic switchover submodule 3312, also can not influence the operate as normal of neighbor AP.
Wherein, preferably, monitor module 331 and also comprise the definite submodule 3313 of distance, be used for determining the distance apart from this AP33 of this wireless terminal according to the average signal strength of wireless terminal transmission message.Can determine the band of position of this wireless terminal at the about x rice of distance A P33 radius by the average signal strength of AP33 according to the wireless terminal message, wherein x can calculate according to signal strength signal intensity and obtain, and AP33 only needs to report average signal strength to get final product to AC11 like this.
Wherein, location-server 22 comprises network topology preservation module 221 and position computation module 222, and network topology is preserved module 221 and is used to preserve topology of networks information; Position computation module 222 is used for according to the network topological information of the information of the wireless terminal of receiving and 221 preservations of network topology preservation module wireless terminal being positioned.
Wherein, preferably, this location-server 22 also comprises neighbor AP selection module 223, is used for the positioning accuracy according to described wireless terminal needs, and the quantity of selecting to open neighbor AP is also notified AC11.The embodiment of the invention can be according to the positioning accuracy needs of different radio terminal, need to select the neighbor AP quantity of unlatching, as Fig. 1, there are 3 neighbor AP (AP1, AP3 and AP5) in AP2, yet, only need three AP can finish location to this wireless terminal according to positioning accuracy to the wireless terminal that inserts AP2.For example only by AP1, AP2 and AP3, or finish location, thereby reach the purpose that reduces as far as possible the neighbor AP influence this wireless terminal by AP1, AP2 and AP5.
As shown in Figure 5, localization method flow chart for the wireless terminal of the embodiment of the invention three, the a plurality of AP of this method tunable position detection to wireless terminal, can be that neighbor AP cooperate to insert AP wireless terminal is positioned detection, also can be to finish detection and localization to wireless terminal separately by AC control neighbor AP.Wherein, AP is by the AC access network, and this embodiment may further comprise the steps:
Step S501, wireless terminal insert the access situation of this wireless terminal of AP notice AC, and the MAC Address of this wireless terminal that will write down report AC by inserting the AP access network.AC writes down the MAC Address of this wireless terminal and reports the AP information (ID of AP) of this wireless terminal, and the AP that this wireless terminal inserts is for inserting AP.Topological structure as shown in Figure 1, wireless terminal is by the AP1 access network, and then this AP1 inserts AP exactly.Wherein, MAC Address can be used as the unique identification of wireless terminal in network.
Step S502, AC judge whether this wireless terminal needs to carry out location positioning, if do not need, then this wireless terminal normally inserts; If desired, then should insert the neighbor AP information of AP according to the AP information searching of network topology structure of preserving and record.For example wireless terminal is by the AP1 access network, and AP2 and the AP5 adjacent with this AP1 are exactly neighbor AP.AC is after judging that wireless terminal inserts AP1, and need carry out location positioning to this wireless terminal, then AC can determine this wireless terminal near access AP (AP1), and AC obtains the adjacent neighbor AP information of this access AP (AP1) (AP2 and AP5) according to the network topology structure of preserving.
Step S503, AC notify at least one neighbor AP adjacent with inserting AP that wireless terminal is monitored, and the MAC Address of the wireless terminal preserved is handed down to neighbor AP.For example AC notifies at least one neighbor AP adjacent with inserting AP that this wireless terminal is monitored, can notify AP2 or AP5 to open and monitor cooperates AP1 to finish the location, also can notify AP2 and AP5 separately this wireless terminal to be monitored, if it is very high to the positioning requirements of this wireless terminal certainly, then also can AP2, AP1 and AP5 jointly this wireless terminal is positioned simultaneously, it is to the positioning result of wireless terminal as shown in Figure 4.
Step S504, neighbor AP switches to the working channel that inserts AP and monitors, and the wireless terminal information of collecting is reported AC after receiving the monitoring notice that AC sends.The working channel that wherein inserts AP also is handed down to neighbor AP by AC, and neighbor AP reports AC with the wireless terminal information that listens to.For example neighbor AP (AP2 and AP5) is after receiving the monitoring notice of AC, the working channel that switches to AP1 is monitored, collect the information of this wireless terminal, wherein, the wireless terminal information that neighbor AP is collected comprises: the message of wireless terminal, the facility information of message intensity and this message of reception, for example ID of AP.
Preferably, embodiment of the invention AP in step S504 can monitor according to the MAC Address of wireless terminal.Obtain the MAC Address of this wireless terminal in neighbor AP after, just can only report the information of this wireless terminal according to this MAC Address.For example the access AP (AP1) of this wireless terminal also can connect by a lot of other wireless terminals, neighbor AP (AP2 and AP5) is after switching to the working channel of AP1, not only can detect the information of this wireless terminal, can also detect the information of other wireless terminals, if this neighbor AP does not have corresponding wireless terminal MAC Address, then neighbor AP can all report AC with the information of detected all wireless terminals, select the information of needs by AC (or location-server) according to the wireless terminal MAC Address, so cause the burden of AC (or location-server); If neighbor AP has the MAC Address of this wireless terminal then the signal of other wireless terminals of listening to directly can be ignored.
The embodiment of the invention has proposed the multiple mode of finishing wireless terminal location by message, a kind of can be by the average signal strength of AP according to the wireless terminal message, can determine the band of position of this wireless terminal at the about x rice of distance A P1 radius, wherein x can calculate according to signal strength signal intensity and obtain, and AP only needs to report average signal strength to get final product to AC like this.Also can send special message, the position of for example special multicast message or the announcement of Action message oneself by AC specific radio terminal.AC only need be with these messages, and the facility information of the signal strength signal intensity of message and reception message sends to location-server, and location-server just can be finished the location positioning of wireless terminal.For example use multicast message transmission locating information, can be the location message for multicast address 01-01-01-00-00-00 in the named place of destination location; All location messages all pass through 802.11 data message (specifically referring to IEEE802.11-1999) encapsulation back transmission, and the destination address of this data message is multicast address 01-01-01-00-00-00.Wherein, the particular content of message can fill or revise according to the needs of positioning service.The location message can also be encapsulated in addition in one special 802.11 the Action message and send, the Action message is a kind of 802.11 administrative message, can be by multiple application according to subtype Action message.In order to support the location of wireless terminal, can define a kind of Action message of specific type, carry concrete locating information by this Action message.
Step S505, AC receive the information of the described wireless terminal that inserts AP and neighbor AP collection, and the information that receives is reported location-server; Certainly if neighbor AP cooperation access AP finishes the detection and localization to wireless terminal, then inserting AP also needs the detection information to this wireless terminal is reported location-server.As Fig. 1, then insert AP (AP1), neighbor AP (AP2 and AP5) information that detects is reported AC, AC is transmitted to location-server with the information of receiving.
Step S506, AC notice neighbor AP stops the monitoring to wireless terminal.Receive at AC and can notify after the positional information of wireless terminal neighbor AP to stop monitoring wireless terminal.
Step S507, location-server positions calculating according to the information of the wireless terminal of receiving and the network topology structure of preservation to this wireless terminal, for example location-server can obtain the positional information of this wireless terminal jointly according to AP1, AP2 and AP5 to the detection and localization information of wireless terminal, is illustrated in figure 4 as the location drawing of the wireless terminal that embodiment of the invention location-server calculates according to the locating information of three AP.As can be seen from Figure 4, the compare location drawing of the wireless terminal that prior art shown in Figure 2 calculates of the position of this wireless terminal is more accurate.
Wherein, preferably, the embodiment of the invention not only can position the current location of wireless terminal, can also calculate by the movement locus to this wireless terminal in a period of time.After neighbor AP was being received the monitoring notice of AC transmission in step S504, the information of timing detection wireless terminal also reported, until the notice of receiving that AC stops to monitor.And neighbor AP all can automatically switch to former working channel and continue to provide service after monitoring is finished, and therefore also can not influence the operate as normal of neighbor AP.
Wherein, preferably, the embodiment of the invention also can select to open the quantity of neighbor AP according to the positioning accuracy that inserts wireless terminal.By behind the AP access network, AC can report location-server with the information of this wireless terminal at wireless terminal, and inquires about the positioning accuracy that this wireless terminal needs.After for example wireless terminal inserted AP1, AC can inquire about the positioning accuracy that this wireless terminal needs, if this wireless terminal needs coarse positioning, then a cooperation AP1 among AC notice AP2 or the AP5 positions this wireless terminal and gets final product; If this wireless terminal needs precisely location, then AC need notify AP2 and AP5 to cooperate AP1 that this wireless terminal is positioned jointly, thereby reaches the purpose that reduces as far as possible the neighbor AP influence.
The embodiment of the invention is by concentrating in the wlan network AC to the centralized control of AP, therefore when needs carry out wireless terminal location, can position detection to this wireless terminal jointly with access AP by coordinating a plurality of neighbor AP, to obtain enough information, finally realized the accurate location of wireless terminal in the concentrated wlan network.And when carrying out the wireless terminal detection, can also position detection according to the specific neighbor AP of the network topology dynamic coordinate of AP, and not need to start all neighbor AP, thereby avoid influence whole network performance.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (21)
1. the localization method of a wireless terminal is characterized in that, wireless access point AP may further comprise the steps by wireless controller AC access network:
By after inserting the AP access network, described AC notifies at least one neighbor AP adjacent with described access AP that described wireless terminal is monitored at wireless terminal;
Described AC receives the information of the described wireless terminal of described neighbor AP collection, and described information is reported location-server;
Described location-server positions described wireless terminal according to the information of the described wireless terminal of receiving.
2. the localization method of wireless terminal according to claim 1 is characterized in that, notifies after at least one neighbor AP adjacent with described access AP monitors described wireless terminal at described AC, and is further comprising the steps of:
Described neighbor AP regularly switches to the working channel of described access AP described wireless terminal is monitored.
3. the localization method of wireless terminal as claimed in claim 1 or 2 is characterized in that described neighbor AP is monitored specifically described wireless terminal and be may further comprise the steps:
Described neighbor AP is monitored described wireless terminal according to the MAC Address of described wireless terminal, the MAC Address of described wireless terminal by described AC from the information interaction of wireless terminal obtain and be handed down to described neighbor AP.
4. as the localization method of wireless terminal as described in the claim 2, it is characterized in that, after the working channel that described neighbor AP regularly switches to described access AP is monitored described wireless terminal, further comprising the steps of:
Described neighbor AP automatically switches to former working channel after collecting the information of described wireless terminal.
5. the localization method of wireless terminal as claimed in claim 1 or 2 is characterized in that, and is after described AC receives the information of the described wireless terminal that described neighbor AP collects, further comprising the steps of:
Described AC notifies described neighbor AP to stop monitoring to described wireless terminal.
6. as the localization method of wireless terminal as described in the claim 3, it is characterized in that described neighbor AP is monitored specifically described wireless terminal and comprised:
Described neighbor AP is monitored multicast message or the Action message that described wireless terminal sends.
7. as the localization method of wireless terminal as described in claim 3 or 6, it is characterized in that described neighbor AP is monitored specifically described wireless terminal and comprised:
Described neighbor AP is determined the distance of described wireless terminal apart from described neighbor AP according to the average signal strength that described wireless terminal sends message.
8. the localization method of wireless terminal according to claim 1 is characterized in that, described AC notifies at least one neighbor AP adjacent with described access AP that described wireless terminal is monitored specifically and may further comprise the steps:
Described location-server notifies described AC to select to open the quantity of neighbor AP according to the positioning accuracy of described wireless terminal needs.
9. the navigation system of a wireless terminal is characterized in that, comprises AC, location-server and at least two AP, and described AP is by described AC access network, and described AC links to each other with described location-server,
Described AC, be used for judging that wireless terminal is by after inserting the AP access network, notify at least one neighbor AP adjacent that described wireless terminal is monitored, and the information of the described wireless terminal that described neighbor AP is collected report described location-server with inserting AP;
Described location-server is used for according to the information of the described wireless terminal of receiving described wireless terminal being positioned.
10. as the navigation system of wireless terminal as described in the claim 9, it is characterized in that described AP comprises and monitor module and information reporting module,
Described monitoring module is used to receive the monitoring notice of described AC, and described wireless terminal is monitored;
Described information reporting module, the information that is used for the described wireless terminal collected according to described monitoring module reports described AC.
11. the navigation system as wireless terminal as described in the claim 10 is characterized in that, described monitoring module comprises regularly monitors submodule and automatic switchover submodule,
Submodule is monitored in described timing, is used at the working channel that the monitoring that receives described AC notifies the back regularly to switch to described access AP described wireless terminal being monitored;
Described automatic switchover submodule is used for automatically switching to former working channel after collecting the information of described wireless terminal.
12. navigation system as wireless terminal as described in claim 10 or 11, it is characterized in that, described monitoring module also comprises the definite submodule of distance, is used for determining according to the average signal strength of described wireless terminal transmission message the distance of the described neighbor AP of distance of described wireless terminal.
13. navigation system as wireless terminal as described in the claim 9, it is characterized in that, described AC comprises the MAC Address administration module, be used at described wireless terminal during by described access AP access network, write down the MAC Address of described wireless terminal, and when notifying described neighbor AP that described wireless terminal is monitored, described MAC Address is handed down to described neighbor AP.
14. the navigation system as wireless terminal as described in the claim 9 is characterized in that, described location-server comprises that neighbor AP selects module, is used for the positioning accuracy according to described wireless terminal needs, and the quantity of selecting to open neighbor AP is also notified described AC.
15. an AP is characterized in that, comprises monitoring module and information reporting module,
Described monitoring module is used to receive the monitoring notice of AC, and wireless terminal is monitored;
Described information reporting module, the information that is used for described wireless terminal that described monitoring module is collected reports described AC.
16., it is characterized in that described monitoring module comprises regularly monitors submodule and automatic switchover submodule as AP as described in the claim 15,
Submodule is monitored in described timing, is used at the working channel that the monitoring that receives described AC notifies the back regularly to switch to described access AP described wireless terminal being monitored;
Described automatic switchover submodule is used for automatically switching to former working channel after collecting the information of described wireless terminal.
17., it is characterized in that described monitoring module comprises that also distance determines submodule as AP as described in claim 15 or 16, be used for determining the distance of the described neighbor AP of distance of described wireless terminal according to the average signal strength that described wireless terminal sends message.
18. an AC is characterized in that, comprises notice administration module and information forwarding module,
Described notice administration module, be used for judging that wireless terminal is by after inserting the AP access network, send the monitoring notice at least one neighbor AP adjacent with inserting AP, and after the information of receiving the described wireless terminal that described neighbor AP is collected, notify described neighbor AP to stop monitoring to described wireless terminal;
Described information forwarding module, the information that is used for described wireless terminal that described neighbor AP is collected reports described location-server.
19. as AC as described in the claim 18, it is characterized in that, also comprise the MAC Address administration module, be used at described wireless terminal during by described access AP access network, write down the MAC Address of described wireless terminal, and when notifying described neighbor AP that described wireless terminal is monitored, described MAC Address is handed down to described neighbor AP.
20. a location-server is characterized in that, comprises network topology preservation module and position computation module,
Described network topology is preserved module, the topology information that is used to preserve network;
Described position computation module is used for according to the network topological information that the information and the described network topology of the described wireless terminal of receiving are preserved the module preservation described wireless terminal being positioned.
21., it is characterized in that as location-server as described in the claim 20, comprise that also neighbor AP selects module, be used for positioning accuracy according to described wireless terminal needs, the quantity of selecting to open neighbor AP is also notified described AC.
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| CNA2007101456007A CN101119390A (en) | 2007-08-29 | 2007-08-29 | Wireless terminal locating method, system and device |
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| CNA2007101456007A CN101119390A (en) | 2007-08-29 | 2007-08-29 | Wireless terminal locating method, system and device |
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| CN101119390A true CN101119390A (en) | 2008-02-06 |
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| CNA2007101456007A Pending CN101119390A (en) | 2007-08-29 | 2007-08-29 | Wireless terminal locating method, system and device |
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