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Frequency Hopping System

Viewing 15 posts - 16 through 30 (of 118 total)
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  • #41282 Reply
    wilibrordus Herbowo
    Guest

    SFH or BBH depend on number of site and number of TRXs,,, bigger TRXs and bigger sites, it is better using SFH.

    Why we use hopping because limitation of allocation freq.

    SFH;we can use 1×1, 1×3, or 1×3 enhance.

    have works.

    #41283 Reply
    KayDee
    Guest

    Thanks Wilibrordus Herbowo!
    If I may ask what do you mean by 1/3 enhence. I have already run the trial on 1/3 and 1/1. I had very good results with 1/3 than with 1/1 does any one know why? Because I did not expect that much difference as far as CDR, HO_DROP_RATE etc are concerned. the other thing I don’t think BBH is a good idea, in Siemens System if using BBH and one of the TRX involved in Hopping fails the system automatically diable Hopping(Frequency redefinition) until the affected TRX is brought back to service.

    #41284 Reply
    Wilibrordus Herbowo
    Guest

    Kaydee,

    SFH 1×3 Enhance is one of fitur of vendors, as I know Siemens can do SFH 1×3 Enhance.
    let say :
    sector 1 have A malist, sector 2 have B malis, and sector 3 have C malist, so for enhance, the MALIST become : A+B for sector 1, B+C for sector 2, and C+A for sector 3.

    If we have many frequencies, better we use non hopping system. or better goes to SFH directly.

    THANKS

    #41285 Reply
    Jonny Giffly
    Guest

    Dear Mr Wili,
    I think you do not hesitate share knowledge and your skill to your friends-Thanks for your kindness.

    Regards,

    Jonny G

    #41286 Reply
    KayDee
    Guest

    Thanks Mr Will.

    I never thought of doing it that way. it looks very good looking at it and it will serve apurpose of having more hopping frequencies. If I may ask again, what is you opinion about E/GPRS hopping. I tried it on non-BCCH carrier, but channel hopping remain 0, meaning i’m not hopping. i locked all BCCH TS’s to make sure that the system allocate non-BCCh TCH for that GPRS call.

    thanks..,..

    #41287 Reply
    Lucas
    Guest

    If i have 2 trx per sector with 5 frec for hopping TRX and reuse 1/1 can i use some feature for add 1 trx without increassing the number of frecs ??

    #41288 Reply
    KayDee
    Guest

    Lucas!!!!!!!!!!
    You can do that without increasing frequency since you already have 5 frequency and only two TRXs. The only problem that you gonna have is MAIO allocation with only 5 frequencies and using 1/1 you can have only one TRX hopping per sector(3 sector site) excluding BCCH. I would advice you to increase your hopping frequencies you will need about 10 frequencies for max 2 TRX/cell hopping.

    I hope this answers your question

    #41289 Reply
    Ravi
    Guest

    I have just joined the Network Engineering department and my new manager asked me to implement Frequency Hopping on our network. I want to know how can i implement this, what is the meaning of polarization in mw & what is TCH & BCCH & tch on trx.

    #41290 Reply
    monem
    Guest

    Diar All
    Why radio planner does not use the HSN 1 , is it because it hopping with predifined cyclic sequence not like the other 63 HSN which are hopp with pseudo random pattern.& which is better for good performance.because it confuse me.
    Please Replay……

    #41291 Reply
    wilibrordus herbowo
    Guest

    HSN 0 = cyclic,
    HSN 1-63 = PN

    HSN 0 never use (unless uses)

    #41292 Reply
    monem
    Guest

    thanks wili:
    further more i need more clarification on the usage of (cyclic HSN 0).
    is it right it used only for BBH (normal combiner), And other noncyclic pseudo HSNs are used for SH with hyprid or wide band combiner. OR itis depend on vendor algorithm spesification.
    And what did you mean by (never uses), because i think i saw usage of it in some network.
    Regards.

    #41293 Reply
    Jonny Giffly
    Guest

    Do anybody explain about SFH 2×2 and advantages?
    Thanks all for your attention.

    #41294 Reply
    Thyagarajan
    Guest

    hi kaydee,

    It is better to go for Synthesizer ,
    if u can give the name of the vendor that u are using i can give u more help.

    #41295 Reply
    KayDee
    Guest

    Hi Thyagarajan!

    we are using Siemens……..

    #41296 Reply
    Wilibrordus Herbowo
    Guest

    For capacity and quality, better go to SFH.
    It can be SFH 1×1 or 1×3.
    IF the network is uniform pattern abd the terrain is flat, 1×3 is OK, if the pattern is not uniform, go with SFH 1×1.

    may be it can help u.

Viewing 15 posts - 16 through 30 (of 118 total)
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