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neighbours

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #47557 Reply
    adeel
    Guest

    Hi, i have a confusion. in my network, our optimizers have defined a lot of neighbors for a single cell and some of them dont even make sense. i want to know the effect of defining un-necessary neighbours on the network.

    #47558 Reply
    Mahesh
    Guest

    Some times it causes to have low Hand Over(HO) KPIs. Because unnessary neighbours always creates HO revisions and HO losts. As a results HO success get reduced.

    With Ericsson experience, there are counters for total no of neighbour relations (NRs) in BSC and total no of measurement frequencies can be defined in BSC. With unwanted NRs these counters can be reached.

    I think frequently you should remove unwanted NRs (Check stastics and remove NRs having low HO attempts)

    #47559 Reply
    Jorge
    Guest

    Number of (inactive) neighboring cells should not be a Hand Over issue since signalling received is not within useful range by the mobile. It may delay the mobile from attaching to the network when first powered on but this depends on what type of signal or coverage the subscriber is getting when mobile power-up happens.

    #47560 Reply
    akefa
    Guest

    Mahesh, the unnessary neighbours never decrease the KPI since the MS will ignore them. As Jorge said, it will delay the MS from attaching the network. Furthermore, the MS battery consume much power in a network containing unessary neighbours which will decrease the life time.

    #47561 Reply
    Pix
    Guest

    And the mobile will loose time by trying to listen to all the neighbours, which means it will not update the rxlev of a certain neighbor as often as it could if it has less neighbours to listen to.

    Please anyone correct me if i’m wrong…

    regards,

    #47562 Reply
    akefa
    Guest

    dear Pix,

    Onc an turned-off MS is switched on, will search for the best bcch and there is no limit in time !

    In active mode, an MS listens to the rxlev and quality for all the registered neigbours and send his measurements to the RBS on SACCH at regular intervals. PIx, you are right only if the time of listenning is longer than the regular intervals of sending the measurements. From practical view, does that happen? if so, could we play with the measurements rate?

    #47563 Reply
    Pix
    Guest

    Akefa, we can’t play with measyurements rates…

    #47564 Reply
    akefa
    Guest

    pix, that means we can not be certain that unessary neigbours will affect the KPI

    #47565 Reply
    Pix
    Guest

    Yes, t’hat’s an open question. Actually, as far as i know, it can delay the reactivity of the handovers, because the n-cell measurements are a bit slow.
    Will it degrade KPI or not…?

    #47566 Reply
    akefa
    Guest

    Pix

    Theoritically speaking, Yes

    I think it is a practical issue since we have no clear figure about how many n sec will be needed to read m rxlev. Maybe the extra time to read extra rxlev is ignored compared to the HO message measurement rate.

    Best Regards

Viewing 10 posts - 1 through 10 (of 10 total)
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