Author Topic: Excessive TOA errors  (Read 381 times)

el_dorado

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Excessive TOA errors
« on: October 29, 2018, 08:11:39 AM »
What does "Excessive TOA error" mean? And how to fix? The latest version of Yate/YateBTS, and Core i7 hardware with USB3.

Code: [Select]
2018-10-29_14:09:40.417826 <gsmtrx:ALL> ARFCN[2]: Slot 1. Excessive TOA error=4 peak/mean=3.60989 count=1 [0x7f8ccc034490]
2018-10-29_14:09:50.582163 <gsmtrx:ALL> ARFCN[0]: Slot 2. Excessive TOA error=3 peak/mean=3.87052 count=1 [0x7f8ccc02a700]
2018-10-29_14:09:51.049245 <gsmtrx:ALL> ARFCN[2]: Slot 4. Excessive TOA error=5 peak/mean=3.24723 count=1 [0x7f8ccc034490]
2018-10-29_14:09:51.236267 <gsmtrx:ALL> ARFCN[2]: Slot 0. Excessive TOA error=-3 peak/mean=3.34375 count=1 [0x7f8ccc034490]
2018-10-29_14:09:55.009369 <gsmtrx:ALL> ARFCN[0]: Slot 5. Excessive TOA error=3 peak/mean=3.06478 count=1 [0x7f8ccc02a700]
2018-10-29_14:09:55.012046 <gsmtrx:ALL> ARFCN[0]: Slot 1. Excessive TOA error=-5 peak/mean=3.10363 count=1 [0x7f8ccc02a700]
2018-10-29_14:09:55.019534 <gsmtrx:ALL> ARFCN[1]: Slot 6. Excessive TOA error=-5 peak/mean=3.63586 count=1 [0x7f8ccc02dbe0]
2018-10-29_14:09:55.031650 <gsmtrx:ALL> ARFCN[2]: Slot 3. Excessive TOA error=3 peak/mean=3.75816 count=1 [0x7f8ccc034490]
2018-10-29_14:09:55.129341 <gsmtrx:ALL> ARFCN[2]: Slot 4. Excessive TOA error=4 peak/mean=3.19134 count=1 [0x7f8ccc034490]
2018-10-29_14:10:02.777870 <gsmtrx:ALL> ARFCN[2]: Slot 6. Excessive TOA error=5 peak/mean=3.37695 count=1 [0x7f8ccc034490]
2018-10-29_14:10:03.517494 <gsmtrx:ALL> ARFCN[2]: Slot 7. Excessive TOA error=-3 peak/mean=3.20965 count=1 [0x7f8ccc034490]
2018-10-29_14:10:18.743594 <gsmtrx:ALL> ARFCN[0]: Slot 7. Excessive TOA error=-3 peak/mean=3.62814 count=1 [0x7f8ccc02a700]
2018-10-29_14:10:18.755647 <gsmtrx:ALL> ARFCN[0]: Slot 4. Excessive TOA errors 1 [0x7f8ccc02a700]
2018-10-29_14:10:18.777079 <gsmtrx:ALL> ARFCN[0]: Slot 2. Excessive TOA error=3 peak/mean=3.85228 count=1 [0x7f8ccc02a700]
2018-10-29_14:10:19.586645 <gsmtrx:ALL> ARFCN[0]: Slot 5. Excessive TOA error=-5 peak/mean=3.47341 count=1 [0x7f8ccc02a700]
2018-10-29_14:10:20.038746 <gsmtrx:ALL> ARFCN[2]: Slot 4. Excessive TOA error=-5 peak/mean=3.01486 count=1 [0x7f8ccc034490]
2018-10-29_14:10:20.134673 <gsmtrx:ALL> ARFCN[2]: Slot 3. Excessive TOA error=-5 peak/mean=3.19816 count=1 [0x7f8ccc034490]
2018-10-29_14:10:28.677317 <gsmtrx:ALL> ARFCN[2]: Slot 2. Excessive TOA error=-3 peak/mean=3.44227 count=1 [0x7f8ccc034490]
2018-10-29_14:10:32.643796 <gsmtrx:ALL> ARFCN[2]: Slot 5. Excessive TOA error=5 peak/mean=3.18953 count=1 [0x7f8ccc034490]
2018-10-29_14:10:32.808468 <gsmtrx:ALL> ARFCN[2]: Slot 2. Excessive TOA error=3 peak/mean=3.34153 count=1 [0x7f8ccc034490]
2018-10-29_14:10:32.917366 <gsmtrx:ALL> ARFCN[2]: Slot 7. Excessive TOA error=3 peak/mean=3.26136 count=1 [0x7f8ccc034490]
2018-10-29_14:10:33.190038 <gsmtrx:ALL> ARFCN[2]: Slot 0. Excessive TOA error=4 peak/mean=3.01768 count=1 [0x7f8ccc034490]
2018-10-29_14:10:33.190990 <gsmtrx:ALL> ARFCN[2]: Slot 1. Excessive TOA error=-3 peak/mean=3.11987 count=1 [0x7f8ccc034490]
2018-10-29_14:10:33.236505 <gsmtrx:ALL> ARFCN[0]: Slot 1. Excessive TOA error=-4 peak/mean=3.34259 count=1 [0x7f8ccc02a700]
2018-10-29_14:10:33.865456 <gsmtrx:ALL> ARFCN[2]: Slot 2. Excessive TOA error=3 peak/mean=3.55914 count=1 [0x7f8ccc034490]

John

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Re: Excessive TOA errors
« Reply #1 on: October 30, 2018, 02:44:10 AM »
From source code :

Code: [Select]
   
// TOA error.  Negative for early, positive for late.
// indexing relationships
// maxIndex - actual t0 of the received signal channel estimate
// center - expected t0 of the received signal channel estimate
// toaError - the offset of the channel estimate from its expected position, negative for early
// TOA error should not exceed +/-2 for a normal burst.
// It indicates a failure of the closed loop timing control.

are you using a vm? i had the same error when using a vm

el_dorado

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Re: Excessive TOA errors
« Reply #2 on: October 30, 2018, 07:38:20 AM »
No VM. Bare metal, tried two different computers from different manufacturers.

david.burgess

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Re: Excessive TOA errors
« Reply #3 on: November 06, 2018, 06:44:21 AM »
These messages mean that the equalizer detected a timing error in the uplink signal. But for an idle channel that does not mean anything. That is why these messages are at the "ALL" debug level.

You see that the peak/mean ratios are small, less than 10. That is an idle channel and the TOA estimator is just looking at noise.

These message do no indicate any particular problem with your system.

el_dorado

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Re: Excessive TOA errors
« Reply #4 on: November 10, 2018, 05:26:02 AM »
david.burgess, thank you very much!