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power control parameter

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  • #59997 Reply
    raman
    Guest

    SSDESUL=85,QDESUL=45,LCOMPUL=8,QCOMPUL=70
    SSDESDL=85,QDESDL=40,LCOMPDL=8,QCOMDL=70
    we have following parameter what could be more aggresive settings and what would be it’s impact ?

    #59998 Reply
    Art
    Guest

    following settings for desired values and
    weighting factors:
    • SSDES = –94 dBm
    • QDESUL = 10
    • Uplink signal strength compensation factor
    (LCOMPUL)2 = 50
    • Uplink signal quality compensation factor
    (QCOMPUL)2 = 30
    These initial values correspond to an aggressive
    power-down regulation aiming to minimize
    uplink interference. However, it was observed
    from analyzing drive test files and cell traffic
    recording (CTR) files that the settings could lead
    to performance deterioration. For instance, a
    connection with received signal strength
    (RXLEV)2 = –80 dBm and received signal quality
    (RXQUAL)2 = 5, given the previous settings,
    would be further down-regulated in steps of
    2 dB, despite the obvious quality problem.
    After studying the case, a more reasonable value
    of SSDES = –88 dBm was introduced, while
    QDESUL was set to zero. Also, compensation
    factor LCOMPUL, which introduces a slope in the
    September 2004 • Volume 2, Number 2 19
    1/12 1/22 2/1 2/11 2/21 3/3 3/13 3/23 4/2 4/12
    Date (MM/DD)
    Figure 1. Network DCR After Implementation of Random Hopping Sequence
    2.3
    2.0
    1.7
    1.4
    1.1
    0.8
    0.5
    DCR (%)
    Cyclic FH Random FH
    Considerable
    network
    performance
    gains can be
    made by fully
    utilizing the
    available
    functionality
    and fine-tuning
    the network
    parameters
    using statistics
    to evaluate
    the results.
    _________________________________
    2 An Ericsson DPC parameter
    power reduction, was set to 100. This setting
    corresponds to maximum uplink regulation (no
    slope) because the algorithm was expected to
    work rapidly on “good” signals. Quality
    compensation parameter QCOMPUL was set to
    60 to enhance up-regulation in case of interference
    and to give the connection a chance to
    overcome the bad quality by increasing the
    output power.
    THANK YOU SIR Michael Pipikakis

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