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Low SS Uplink Problem

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  • #51028 Reply
    Alex
    Guest

    I have so many problems with “Low SS UpLink”.It causes many SDCCH and TCH Drops.
    Could you please tell me how can I solve this problem.
    If more information is needed I can share.

    #51029 Reply
    Pix
    Guest

    Hi alex,

    I can think of 2 possibilities :

    1. the cell coverage is not strong enough, andmany subscribers are receiveing less than -90dBm in DL. In one word : bad coverage

    2. this sector is having a hardware issue, adding extra loss in the receiving path. As a consequence, the UL RXLEV is very low, and therefore many emergency handovers and call drops must be expected.

    Regards,
    pix

    #51030 Reply
    Alex
    Guest

    Thanks Pix.
    I think the first possibility that you mentioned is correct in this case.
    Suppose we have this problem,how can I solve it?
    Which tilt help us (Uptilt or Downtilt)?And what else?

    #51031 Reply
    Pix
    Guest

    Alex,

    what is the current value of the tilt ? (mechanical + electrical). And how far is the area you want to cover ?

    How high is the site compared to this area to cover ?

    After you give me these values, maybe it will appear that your tilt is good enough. In this situation, you might want to :
    add one more antenna in order to do RX DIVERSITY
    add two more antennas to do 4 Rx Diversity and 2 Tx diversity
    change your antenna model (use one with more gain, more directivity)
    add a tower mounted amplifier (a.k.a TMA or LNA)

    Since the main problem is uplink, I can’t ask you to use a high power TRX : this would increase onl the DL strength, not the UL.

    Regards,
    Pix

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