live client locating using wifi

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  • Updated 2 years ago

Hi guys,

Has anybody any experience with locating clients that are connected through wifi ?

What is the accuracy that you achieved ? Is live tracking of the client possible ?

Thanks for sharing your experiences !

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mr bee

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Posted 2 years ago

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Ho Ka Lok

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Just want to ask, will AP250 help a bit by the bundled BLE/iBeacon ?
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mr bee

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You have experience with AP250 BLE/iBeacon and positioning accuracy ?
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Ho Ka Lok

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Not yet, our new office just deployed AP250 and we're still fine-tuning the Dual-5G and interference. We want to implement indoor GPS with help of BLE/iBeacon in the future and we want to have another solution not by RTLS. Thanks!
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Crowdie, Champ

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It really depends on whether you want to know what a wireless client is close to (iBeacon) or where a wireless client is located (RTLS and/or GPS).  It is a common mistake to try and implement an iBeacon solution to determine location, which is not what it was designed for.
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mr bee

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Why is iBeacon not designed for location determination of clients ? What was the original idea behind iBeacon technology ?

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Crowdie, Champ

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Think of a public museum deployment.

RTLS gives you absolute location information (location on a floor plan or GPS co-ordinates, for example) on where the wireless client is.  It allows you to see where a wireless client is and has been in the museum whether they are close to an access point or not.  When you think of a dot moving around a floor plan in real time that is RTLS.

Take the same scenario in a museum and as you approach a painting the iPad you hired when you brought your ticket starts automatically playing a video about the painting and the artist.  As you move away from the painting to an ancient ceremonial spear a different video plays.  The iBeacon application is reacting to your proximity to the exhibits and playing the appropriate video.

RTLS - location.
iBeacon - proximity.
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Crowdie, Champ

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To complete live tracking of wireless clients you need a RTLS solution such as Ekahau.  Your access points need to be deployed in suitable locations for RTLS.  The level of accuracy you can achieve is heavily dependent on your building layout.  For example, if you have a large open plan area it can be difficult to get a high level of accuracy as the change in RSSI around the open plan area is very low - just free space loss.
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mr bee

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The RTLS solution of Ekahau looks promising. Has anybody any experience with this solution and what kind of accuracy can be achieved in eg. a shop of 2.000 m2 with 12 access points ?
(Edited)
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Crowdie, Champ

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It depends on the internal construction and access point layout.

Ekahau RTLS requires in all locations one access point with a minumum RSSI of -65 dBm or better and two additional access points with a minimum RSSI of -75 dBm or better.  If you can get one access point with a minimum RSSI of -55 dBm or better and two additional access points with a minimum RSSI of -75 dBm or better then you can get quite accurate.

You can also use location beacons which are IrDA transmitters and when a RTLS tag comes into range of the location beacon the RTLS tag will transmit instantly back to the RTLS server.  The vertical and horizontal spread of the IrDA signal can be adjusted depending on your requirements.  These are really useful if you absolutely need to know when a tag is in a specific area or you just have a corner where your wireless signal will not reach.