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Coverage percentage

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #61391 Reply
    Fresh Opt
    Guest

    Hi,
    I want to calculate percentage of coverage in the whole country. Which threshold in dBm should I take for calculation? -95 dBm? -105 dBm? Anyone did the same?
    I appreciate if someone can give me an answer.
    Fresh Opt

    #61392 Reply
    Pix
    Guest

    It depends mostly if you want to provide indoor, incar or outdoot coverage.
    for outdoor coverage, a threshold of -85dBm is the minimum (safer to take -80dBm)

    indoor, you use -70dBm or more.

    cheers
    pix

    #61393 Reply
    Fresh Opt
    Guest

    Thank you Pix.
    My manager wants to know how many percents is covered our country, territorially and for population area. I can do that from RNP but I didn’t know which threshold to take. I have seen some operators, they used threshold -106 dBm. What you think about that.
    Regards,
    Fresh Opt.

    #61394 Reply
    Pix
    Guest

    FreshOpt,

    Ok, i gave you “design” values ๐Ÿ™‚ To have a rough idea of your operator coverage, you can use any value you want… even though -106dBm seems to low. A MS shall be sensitive down to -102dBm. Not less than this.

    So the minimal threshold you can use is -102dBm. But if anyone goes out and check the validity of your study, you’ll be in trouble ๐Ÿ™‚ Also, in your RNP, did you set your tool to take into account body margin, fast fading and lognormal margin ?

    For me, a “safe” threshold (for your purpose) would be -92dBm, for outdoor coverage.
    A little aggressive would be -95dBm. And if noone is never going to check it, or if you want to compare your network with another operator that is using a certain threshold, then -of course- use their threshold !
    If they already use -106dBm, then use -106dBm. Otherwise your network will look bad.

    #61395 Reply
    Fresh Opt
    Guest

    Thanks Pix for valuable informations.
    Regards,

    #61396 Reply
    paraHO
    Guest

    The thresholds used do vary from country to country. One operator in the UK uses BTS 1 (-105dBm) as the back-stop for the lowest received signal strength at the BTS receiver.

    For the MS receiver see TBR:

    20.6 RX Measurement
    20.6.1 Signal Strength
    Test purpose:
    1) To verify that the RMS received signal level at the receiver input is reported by the MS to the BTS over the full range of -110dBm to -48 dBm with a relative accuracy of +/- 1dB within any 20dB portion of the total measurement range.

    2) To verify that the RMS received signal level at the receiver input is reported by the MS to the BTS over the full range of -110dBm to -48 dBm with an absolute accuracy of +/- 4dB from -110 dBm to -70dBm under normal conditions and +/- 6dB over the full range under both normal and extreme conditions.

    3) To verify that if the received signal level falls below the reference sensitivity level for the class of MS and if the MS reports this signal then the MS shall report a level between the
    reference sensitivity level and the actual received level.

    #61397 Reply
    pix
    Guest

    paraHO,

    but measurements are not the same as “being able to make a call”… MS are supposed to be able to make a call at -102dBm (minimum performance defined by 3GPP).

    however, due to fading, body margin, interference… this value is very difficult to achieve. That’s why a 10dB security margin is the least any radio planner would take to cover his … “arse” ๐Ÿ™‚ (that’s how they say in UK, right ?)

    cheers,
    pix

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