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GPRS & EDGE Traffic in Siemens

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  • 20th July 2009 at 13:28 #58050
    Zbigniew
    Guest

    Hi all,

    I am looking for a reasonable KPI to calculate the GPRS & EDGE Traffic (in Erlang, not the data volume) for Siemens BSS.

    The counter NALLPDCH (9,25) shows the minimum, average and maximum number of PDCH in a cell but how is this related to the GP Timeslots ?

    Any hints are welcome.

    Tnx Zbigniew

    20th July 2009 at 13:59 #58051
    Pix
    Guest

    Hello,

    What is “GP” timeslots ? (sorry, I’m not working with Siemens, but I can try to help)

    Do you mean “Gb” ?

    The best KPI to calculate EGPRS traffic is the data volume, why do you need Erlang ?

    I assume that you are trying to compute the traffic on the interfaces, and see if the interfaces are congested or not? In this case, the best KPI would be the interface load, if you have t 🙂
    For instance, in alcatel, each interface (Abis or Ater) can be divided in “nibbles” (= 16kb/s = one quarter of a timeslot). And there are indicators that say how much nibbles are used at BH, and how many are available.

    So it’s really simple to check the load (busy / available)

    On the Gb interface, we are using a frame relay interface, which capacity is counted in kb/s, so it’s ok to work with data volume or data throughput.

    I’m sorry again not to answer your question precisely, but perhaps it can give you some ideas.

    Cheers,
    Pic

    21st July 2009 at 07:29 #58052
    Zbigniew
    Guest

    Hello Pix,

    GP Timeslots means GPRS Timeslots in Siemens BSS. There is a difference between “Dedicated GPRS Timeslots” (i.e. the number of GPRS only timeslots) and “Default GPRS Timeslots” (i.e. the number of timeslots after territory upgrade). Unfortunately the number of used timeslots for GPRS are not counted, only the number of PDCH (GPRS Sessions) is evaluated.

    I need Erlang to see the overall timeslot usage in the cell (x % traffic, y % GPRS, z % EDGE etc.)

    Kind Regards

    Zbigniew

    21st July 2009 at 08:26 #58053
    Pix
    Guest

    Hello,

    Ok, I understand better now. But I really can’t help…
    NALLPDCH seems to be counting all the used PDCH in the cell, isn’t it ?
    1 PDCH = 1 timeslot used for (E)GPRS transfers

    If you want to convert this in erlang, you need to mutliply it by the observed period

    For instance, in one hour :
    5 PDCH used in the cell in average –> 5 * 3600 / 3600 = 5 erlangs for that hour.

    Cheers,
    Pix

    21st July 2009 at 11:01 #58054
    toto
    Guest

    Hello,
    you can try this , to calculate the date_traffic in Erlang…
    (Nallpdch_Meadl/3600) as DataTrafficDL in Erl and
    (Nallpdch_Meaul/3600) as DataTrafficUL in Erl

    22nd July 2009 at 06:14 #58055
    Zbigniew
    Guest

    Hello Pix, hello Toto,

    I think the problem is that a GPRS Timeslot can include multiple PDCH (GPRS & EDGE sessions).

    Maybe it is impossible to calculate the traffic in Erlang because the average number of used timeslots for these sessions is not known.

    Thank you !

    Kind Regards

    Zbigniew

    22nd July 2009 at 10:09 #58056
    Pix
    Guest

    Well, perhaps Siemens did a mistake in their vocabulary, but 1 PDCH = 1 Timeslot. A PDCH is a physical timeslot. You can’t have more than 1 PDCH in one timeslot.

    … And, within 1 PDCH you can multiplex several TBF (several users).

    So the formulas we proposed should be valid.

    What is Nallpdch_Meadl ?

    22nd July 2009 at 10:20 #58057
    toto
    Guest

    Hi all,Nallpdch_Meadl means mean number of used PDCH’s(active TBF’s) per cell in DL

    23rd July 2009 at 03:12 #58058
    Pan
    Guest

    Dear, all! PDCH is PDCH in Siemens too: “The physical channel (one timeslot of the TDMA frame) assigned to the Packet Data
    Services (PS) (either statically or dynamically) is named “Packet Data Channel (PDCH)”. PDCH is not equal TBF. There is possibility to create up to 16 TBFs in one PDCH. I.e. one TS (PDCH) can include up to 16 TBFs (not PDCHs).

    23rd July 2009 at 06:37 #58059
    Pix
    Guest

    Pan, obviously i agree with you (again !).

    Any help about “TFO in Alcatel”… the Supplementary Services ?

    23rd July 2009 at 17:06 #58060
    Sammy
    Guest

    For Voice its
    Total voice traffic (Erl) MEBUSTCH[1..4]

    For GPRS/EDGE in Kb its

    ((MUTHRF[1..26] + REMUTHRF[1..13] + MSTHRF[1..2]) * 8/1000)*GRAN*60

    This is how we calculate but I dont know abt erlangs. Anyway good to see someone talking about Siemens

    23rd July 2009 at 17:10 #58061
    Sammy
    Guest

    I agree with Pix and Pan…1 TS cannot have multiple PDCHs

    1 TS=1 PDCH= multiple TBFs

    In case of extended range channels…we assign two Time slots

    23rd July 2009 at 17:53 #58062
    Pix
    Guest

    Sammy,

    “Anyway good to see someone talking about Siemens”

    Isn’t it Nokia-Siemens ? 🙂

    23rd July 2009 at 18:19 #58063
    Pan
    Guest

    Well, Pix! I will try:)

    29th July 2009 at 20:42 #58064
    Sammy
    Guest

    Yes it is Nokia-Siemens…but Nokia customers use Nokia equipmwnt and Siemens customers use Siemens equipment…Its just a change of name for me

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