Client Location Accurracy

[Rob Johnson]

I have a case I'm working where an MSE is tracking wireless clients and the clients are showing up on the map where they shouldn't be.

I know there are certain requirements to get good location accurracy like the number of APs hearing the device, RSSI and SNR-

What of the show client commands are the best to run to make sure I'm meeting at least the 3 requirements above and are there any other commands I should be looking at?

thanks, rob

[Rasika Nayanajith · Accepted solution]

Hi Rob,

"show client detail " should give you the readings you looking for. Here is one example

(WLC) >show client detail 60:36:dd:26:83:4c

          .

          .

Client Statistics:

     .

     .

      Number of Policy Errors.................... 0

      Radio Signal Strength Indicator............ -65 dBm

      Signal to Noise Ratio...................... 33 dB

Client Rate Limiting Statistics:

      Number of Data Packets Recieved............ 0

      Number of Data Rx Packets Dropped.......... 0

      Number of Data Bytes Recieved.............. 0

      Number of Data Rx Bytes Dropped............ 0

      Number of Realtime Packets Recieved........ 0

      Number of Realtime Rx Packets Dropped...... 0

      Number of Realtime Bytes Recieved.......... 0

      Number of Realtime Rx Bytes Dropped........ 0

      Number of Data Packets Sent................ 0

      Number of Data Tx Packets Dropped.......... 0

      Number of Data Bytes Sent.................. 0

      Number of Data Tx Bytes Dropped............ 0

      Number of Realtime Packets Sent............ 0

      Number of Realtime Tx Packets Dropped...... 0

      Number of Realtime Bytes Sent.............. 0

      Number of Realtime Tx Bytes Dropped........ 0

Nearby AP Statistics:

      BUN-AT00-L1R0OUTR(slot 0)

        antenna0: 29 secs ago.................... -80 dBm

        antenna1: 29 secs ago.................... -68 dBm

      BUN-AT00-L2RCINER(slot 0)

        antenna0: 29 secs ago.................... -68 dBm

        antenna1: 29 secs ago.................... -75 dBm

      BUN-AT00-L2RCINER(slot 0)

        antenna0: 29 secs ago.................... -68 dBm

        antenna1: 29 secs ago.................... -73 dBm

      BUN-AT00-L2RTHEAR(slot 0)

        antenna0: 29 secs ago.................... -79 dBm

        antenna1: 29 secs ago.................... -75 dBm

      BUN-AT00-L2RTHEAR(slot 0)

        antenna0: 29 secs ago.................... -86 dBm

        antenna1: 29 secs ago.................... -83 dBm

      BUN-L000-L2R0CLTR(slot 0)

        antenna0: 1066 secs ago.................. -95 dBm

        antenna1: 1066 secs ago.................. -94 dBm

      BUN-L000-L1R142aR(slot 0)

        antenna0: 1585 secs ago.................. -96 dBm

        antenna1: 1585 secs ago.................. -95 dBm

      BUN-AE00-L1RxOUTR(slot 0)

        antenna0: 29 secs ago.................... -82 dBm

        antenna1: 29 secs ago.................... -82 dBm

      BUN-AW00-L1xROUTR(slot 0)

        antenna0: 29 secs ago.................... -86 dBm

        antenna1: 29 secs ago.................... -84 dBm

Here is MSE 7.4 config guide point to to some locaton accuracy verification, may be useful to you

http://www.cisco.com/en/US/docs/wireless/mse/3350/7.4/CAS_Configuration/Guide/7_4_MSE_CAS_chapter_01010.html#concept_846B07811B21435A92D07BF11DC6A800

HTH

Rasika

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[Scott Fella · Accepted solution]

Just to add.... I have seen this issue also when the AP's are placed incorrectly on the map.  The question is, how bad is the data or should I say the location NCS/PI is showing the client as to where the client really is?  In some environments with areas that can attenuate signal, adding walls and specifying the attenuation has helped many of my customers track clients better.  There are many things that can throw off how location is presented to you from NCS/PI, and it was always best for me to review their RF and AP placements before I even start looking at the NCS/PI or MSE.  Many times then it lead to performing a calibration.

Thanks,

Scott

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[ericlenz]

I'm having this problem too.  I noticed that the floor dimensions under map editor are way off.  It should be 12,000 sq ft or so and comes up at less than 1,000.  Seems that this should be correct in order for location services to work properly but it will be a LOT of trouble to change them all.  Can someone verify that the floor/building dimensions should be accurate in order for this to work?  Thanks much

[Scott Fella]

Yes it should be.

Thanks,

Scott

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[ericlenz]

Good to know.  Thanks!

[Scott Fella]

Also... AP locations should be accurate... I have seen installers place AP's in the wrong location than what they were told:)

Thanks,

Scott

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[ericlenz]

Pretty sure they are correct but I'm verifying as I go.  Thanks again

[Scott Fella]

Yeah... I typically would do a walk-through myself and if one is wrong... I have them verify everything again:)

Thanks,

Scott

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