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E-GSM and P-GSM

Viewing 12 posts - 1 through 12 (of 12 total)
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  • #65028 Reply
    jack
    Guest

    i read below sentences in one Doc from Nokia:
    An additional possibility to increase the capacity of a classical GSM 900 network is offered by the extended GSM 900 band. Standard (P-GSM) and extended (E-GSM) frequencies are used in separate BTSs. With nokia it is not possible to use TRXs of both bands within the same BTS. Tri band must be supported by the MS as well. The common BCCH feature is required to put the BTS under one BCCH, one Segment.

    my question is:
    why P and E band must use in separate cells?
    why channels of both bands cannot be used in same cell?
    please explain this situation:
    if in one cell BCCH TRX have E-GSM FREQ and other TRXs have P-GSM FREQ,it is possible?

    #65029 Reply
    pix
    Guest

    Hello Jack,

    why P and E band must use in separate cells?
    — it is a nokia’s limitation

    why channels of both bands cannot be used in same cell?
    — it is a nokia’s limitation

    please explain this situation:
    if in one cell BCCH TRX have E-GSM FREQ and other TRXs have P-GSM FREQ,it is possible?

    — In nokia, according to your document : no
    But in ALU for example, it is possible, however it is not recommended ! Because not all MS are E-GSM capable. Therefore it is better to have a P-GSM BCCH, and some E GSM trx. If MS is EGSM capable, it goes to EGSM trx, otherwise it goes to PGSM trx. But in all cases, the MS is able to do the call setup on a PGSM BCCH.

    Regards,
    Pix

    #65030 Reply
    Rex
    Guest

    Hi,
    We are using both P-GSM and G1(E-GSM) in the same cell and it works perfectly. Two TRXs in P-GSM and the rest in E-GSM. Two TRXs in P-GSM appeared to be enough for older phones which not support G1 band (E-GSM). Vendor is ALU. I’m surprised why in Nokia it is not possible.
    Regards,
    Rex

    #65031 Reply
    pix
    Guest

    Rex,

    maybe this was an extract of an old documentation? Later release from nokia should support it as well, otherwise, that is suprising indeed !

    Regarding your ALU network : you are using EGSM_RR_ALLOCATION = 0, right ?

    What is the penetration rate of EGSM MS ? (there are some indicators to check that out in NPO, if i remember correctly)

    Regards
    pix

    #65032 Reply
    JACK
    Guest

    hi pix
    you are right.
    it was an old Doc.
    i test it.
    i can have E-GSM and P-GSM trx in one cell,but in this situation i cannot have Hopping!this cell must be in BB or NOT hopping mode.
    if i want to create one MA list consist of P-GSM and E-GSM Freqs i should buy this feature from nokia.i dont have much money to do that!!
    then i can attach this bran-new MA list to Cell and have RF hopping.
    what is advantage and disadvantage of having P-GSM and E-GSM TRXs in one cell in BB or NOT hopping mode?
    last question:
    please clarify me about PCU POOLING in nokia BSC.
    regards

    #65033 Reply
    pix
    Guest

    hi jack,

    i’m not familiar at all with nokia system, so i can’t help you more. The idea is that a MS which is only P-GSM cannot use a frequency “G1”, this is why mixing both bands within one MA list should not be done.
    I wonder how nokia do it with BBH. I guess the G1 trx are hopping on G1 frq only, and PGSM are hopping on PGSM frequencies only. (?)

    regards
    pix

    #65034 Reply
    Rex
    Guest

    Hi Pix,
    Yes, we are using EGSM_RR_ALLOCATION = 0 and the penetration rate is over 99%.
    Regards,
    Rex.

    #65035 Reply
    jean
    Guest

    Allo Pix,
    We have a network with 22eGSM and 8pGSM frequencies with high penetration of eGSM non cap mobile. Unfortunately, we cannot plan all the BCCH with pGSM, therefore, we cannot use RR Alloc Str = 0, So we planned to make a plan with pure eGSM, so that the DCS can handle the problem mobiles. But we have a concern, the pure eGSM will not be able to serve as a rescue cell for the problem mobiles when they need to leave DCS in emergency….Any Idea?

    #65036 Reply
    pix
    Guest

    jean,

    your non-capable EGSM MS are screwed !!
    Keeping all of them in the DCS band is a solution, and I don’t have any other idea in my mind… But they will experience call drops when leaving the DCS1800 cells. And “no network” in the rural area without DCS1800 coverage.

    What is the penetration rate of the EGSM MS ? More than 5% ?

    The best approach is to replace the old PGSM MS by newer EGSM MS. You could track them down by doing a a-interface trace.
    Then, you need to involve Customer Relations / Marketing dpt, so they can offer new phones to those (old & very devoted) customers.

    #65037 Reply
    Jean
    Guest

    Thanks Pix. I used NB_EGSM_MS_ACCESS_EXCEPT_LU_PM110(MC706)(nb) to analyse eGSM accesses and some cells had up to 80% accesses by eGSM non-capable mobiles, but these are for the successes. Is there any other indicator I can use to estimate the failures apart from Astellia Trace?
    In addition, for a cell with BCCH- eGSM, will a non capable phone even attempt???

    #65038 Reply
    NSN Guy
    Guest

    Hey All ,

    It depends on your BSC Software Version Used

    If RG 10 – you can’t use PGSM as BCCH & EGSM as TCHs , but its possible to use EGSM as BCCH and PGSM as TCH

    IF RG15 – you can use PGSM – EGSM in any form you want , but you have to enable Feature {{ EPM = EGSM-PGSM MErge}}

    BR

    #65039 Reply
    sander
    Guest

    In what countries pGSM is allowed?

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