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ITCF Parameter TC Drops

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ITCF parameter
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  1 ©   NOKIA Presentation_Name.PPT / DD-MM-YYYY / Initials Company Confidential ITCF parameter NUMBER OF IGNORED TRANSCODER FAILURE (ITCF)  This Parameter is used to check how many Transcoder Failure the system will receive before it Releases the calls. Explanation:   After a speech path connection has been established between the BTS and the TC, they try to align with each other to enable speech coding both in uplink and downlink directions. If the alignment procedure fails, speech decoding also fails and speech is no longer audible. In this case, the BTS sends CONNECTION_FAILURE_INDICATION message to the BSC. The BSC requests for a clearing and then releases the resources connected to the call. The cause field in this failure indication message is REMOTE TRANSCODER FAIL”    When more aggressive HR is introduced, due to the interference in the air interface and signaling messages can be lost. Re-sending the messages one or more times can lengthen the call establishment dramatically and this might lead to trigger of REMOTE TRANSCODE FAIL counters.  If parameter ITCF is set to 0 (default), the call clearing procedure will be triggered immediately when CONNECTION_FAILURE_INDICATION message (with cause transcoder failure) is received from BTS. Otherwise, BSC will not release the ongoing call until the number of CONNECTION_FAILURE_INDICATION messages (with cause transcoder failure) received exceeds ITCF. BTS repeats the message at one-second intervals. If the frame synchronization is obtained again or the call is released, the counting of remote transcoder failure causes begins from zero again.  2 ©   NOKIA Presentation_Name.PPT / DD-MM-YYYY / Initials Company Confidential ITCF parameter  Advantage & Disadvantage if ITCF [ ITCF=4 ] ã If the circuit is really faulty the call will be released after the BSC receives the four CONNECTION_FAILURE_INDICATION message from the TC. So in this case call will continue on the Time slot for some time ( till 4 messages are not received) even if the BSC knows that the circuit is faulty. ã Secondly if the circuit is affected by a short term disturbance ( eg. short term transmission disturbance) which causes a loss of TRAU frame synchronization the call will NOT be released by the system.  3 ©   NOKIA Presentation_Name.PPT / DD-MM-YYYY / Initials Company Confidential ITCF parameter ITCF testing results on Mumbai Network  Settings in all the BSCs, ITCF = 0  On 13/02/06 ITCF settings were changed to 2 for all BSC in Mumbai Network. Observation: Drop in no of Tr_Fail and Tch drop have improved. Nokia Recommend to change the settings to 2 on all BSCs where we have aggressive HR . Reduced Tr_Fail 020004000600080001000012000140001600018000     2    /    6    /    2    0    0    6    2    /    7    /    2    0    0    6    2    /    8    /    2    0    0    6    2    /    9    /    2    0    0    6    2    /   1    0    /    2    0    0    6    2    /   1   1    /    2    0    0    6    2    /   1    2    /    2    0    0    6    2    /   1    3    /    2    0    0    6    2    /   1   4    /    2    0    0    6    2    /   1    5    /    2    0    0    6    2    /   1    6    /    2    0    0    6 Date     N   o .   o    f    T   r   a   n   s   c   o    d   e   r    F   a    i    l   u   r   e   s  4 ©   NOKIA Presentation_Name.PPT / DD-MM-YYYY / Initials Company Confidential Date BSC Tch drp   tr_ fail   BSC Tch_ drp   tr_ fail   BSC Tch_ drp   tr_ fail   BSC Tch_ drp   tr_ fail   04/02/2006   BSC33KRT   1.20   1923   BSC29SPT   0.93   217   BSC28SLA   0.96   917   BSC31TRI   1.14   806   05/02/2006   BSC33KRT   1.21   2063   BSC29SPT   0.90   312   BSC28SLA   0.75   116   BSC31TRI   1.01   873   06/02/2006   BSC33KRT   1.30   2314   BSC29SPT   0.93   266   BSC28SLA   1.03   862   BSC31TRI   1.11   857   07/02/2006   BSC33KRT   1.22   2431   BSC29SPT   0.93   543   BSC28SLA   0.95   1360   BSC31TRI   1.25   1148   08/02/2006   BSC33KRT   1.29   3684   BSC29SPT   0.93   314   BSC28SLA   0.85   860   BSC31TRI   1.24   778   09/02/2006   BSC33KRT   1.23   3263   BSC29SPT   0.93   492   BSC28SLA   0.78   452   BSC31TRI   1.10   899   10/02/2006   BSC33KRT   1.04   1603   BSC29SPT   0.93   368   BSC28SLA   0.82   1055   BSC31TRI   1.10   1430   11/02/2006   BSC33KRT   0.95   605   BSC29SPT   0.88   424   BSC28SLA   0.79   312   BSC31TRI   1.16   715   12/02/2006   BSC33KRT   1.00   572   BSC29SPT   0.86   327   BSC28SLA   0.66   45   BSC31TRI   0.93   666   13/02/2006   BSC33KRT   0.96   519   BSC29SPT   0.89   48   BSC28SLA   0.82   248   BSC31TRI   1.12   102   14/02/2006   BSC33KRT   1.05   520   BSC29SPT   0.95   27   BSC28SLA   0.89   34   BSC31TRI   1.15   18   15/02/2006   BSC33KRT   0.98   481   BSC29SPT   0.89   15   BSC28SLA   0.81   26   BSC31TRI   1.07   85   16/02/2006   BSC33KRT   0.90   9   BSC29SPT   0.85   11   BSC28SLA   0.78   19   BSC31TRI   1.04   17  
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