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High CDR during Rainy Days

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  • #67496 Reply
    Alex
    Guest

    in our network, it was observed Call drop Rate is increasing in rainy days. What may be the reason ?

    #67497 Reply
    paraHO
    Guest

    Alex some guessing by me.

    MS expected still connect to BTS mast in heavy rain conditions.

    Are these 2G or 3G call drops?

    Are the MSs in fringe coverage area – cell breathing? You considered maybe increase power output of BTSs rainy days?

    #67498 Reply
    Rex
    Guest

    Hi,
    it could be because of Abis problems if 2Mb links are Microwave. If you are ALU then check if drops are due to remoteTC. Microwave links can cause problems in heavy rain conditions.
    Regards,
    Rex

    #67499 Reply
    pix
    Guest

    yes, rain causes more loss on the radio path:
    -on air interface, cell coverage is reduced (max -3dB, in very heavy rain)
    – on abis, if microwaves are used, links are lost intermittently

    also,
    * water in the antenna feeders/connectors -> it reduces the coverage even more
    * a statistical effect : more calls are made indoor or in-car, less calls are made outdoor -> rxlev is lower -> call drops occur more frequently.

    #67500 Reply
    Ds
    Guest

    Hi,
    In one of our circles,3G voice traffic is very less but due to lower Denom, % value is high. call drops are on random cells and generally not more than 10 on concerned cells.
    kindly suggest some ways to improve such cases or any parameter settings for DCR improvement.
    vendor is NSN.

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