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    Event A3 in LTE

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    vishalkavi18
    Event A3 triggers intra-LTE mobility and handover based on measurement reporting in LTE networks. User equipment detect suitable neighboring cells and perform measurements of Received Signal Reference Power (RSRP) and Reference Signal Received Quality (RSRQ) on serving and neighbor cells. The UE uses offset and hysteresis parameters to determine if a neighbor cell is enough better than the serving cell to trigger a handover via Event A3.

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    Event A3 in LTE

    Uploaded by

    vishalkavi18
    525 views2 pages
    Event A3 triggers intra-LTE mobility and handover based on measurement reporting in LTE networks. User equipment detect suitable neighboring cells and perform measurements of Received Signal Reference Power (RSRP) and Reference Signal Received Quality (RSRQ) on serving and neighbor cells. The UE uses offset and hysteresis parameters to determine if a neighbor cell is enough better than the serving cell to trigger a handover via Event A3.

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    Event A3 in LTE

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    Event A3 triggers intra-LTE mobility and handover based on measurement reporting in LTE networks. User equipment detect suitable neighboring cells and perform measurements of Received Signal Reference Power (RSRP) and Reference Signal Received Quality (RSRQ) on serving and neighbor cells. The UE uses offset and hysteresis parameters to determine if a neighbor cell is enough better than the serving cell to trigger a handover via Event A3.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    525 views2 pages

    Event A3 in LTE

    Uploaded by

    vishalkavi18
    Event A3 triggers intra-LTE mobility and handover based on measurement reporting in LTE networks. User equipment detect suitable neighboring cells and perform measurements of Received Signal Reference Power (RSRP) and Reference Signal Received Quality (RSRQ) on serving and neighbor cells. The UE uses offset and hysteresis parameters to determine if a neighbor cell is enough better than the serving cell to trigger a handover via Event A3.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
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    of 2

    Event A3 in LTE

    Event A3 is used to trigger intra LTE mobility. Unlike GSM and WCDMA UE don't perform
    periodic measurements of neighbor cells. Measurement based reporting used in LTE to trigger
    handover.

    By default, user equipment in the LTE network detect suitable neighbor cells without the assistance
    of a list of neighbor cells sent by the serving RBS. User equipment are expected to blindly detect
    suitable handover candidates and the subsequent handover evaluation is undertaken using generic
    offset values. The exception to this occurs when specific handover offset values are defined between
    neighboring cells by the network operator. When specific cell offset relationships exist, this
    information is sent to the user equipment inRRCConnectionReconfiguration messages by the RBS.

    The RRCConnectionReconfiguration message can also contain a list of cells for which handover is
    not allowed. These cells are identified by their Physical Cell Identity or by a range of Physical Cell
    Identities.

    The user equipment uses parameters sent by the RBS to determine when to perform handover
    measurements. Measurements commences on the serving and neighboring cells when the RSRP of
    the serving cell falls below the value defined in the sMeasure parameter. The user equipment detects
    neighboring cells via intra frequency searches.

    Event A3:- Neighbour becomes amount of offset better than serving

    First of all the user equipment uses either RSRP or RSRQ measurements to determine whether to
    enter the EventA3 condition. The triggerQuantityA3 parameter is used to configure whether RSRP
    or RSRQ values are used to trigger EventA3.
    Attachment 3580

    Measurements of RSRP and RSRQ are performed on the serving and detected neighboring cells. The
    measured values of RSRP and RSRQ can then be filtered based upon the settings of the
    parameter filterCoefficientEUtraRsrp andfilterCoefficientEUtraRsrq parameters. The filter
    averages a number of measurements in order to filter out the impact of large scale fast fading.

    The user equipment then uses an offset value, a3offset, and a hysteresis value,hysteresisA3, to
    determine whether to trigger the EventA3. Non default offset relationships use the
    value cellIndividualOffsetEUtran instead of a3offset for the particular cell relationship.

    The formula used by the user equipment for evaluating entry to EventA3 is shown below:

    Mn − HysteresisA3 > Ms + a3offset

    Where,
    Mn = measured value of the neighboring cell (either RSRP or RSRQ)
    Ms = measured value of the serving cell (either RSRP or RSRQ)

    Once EventA3 is triggered, the user equipment will wait a predetermined time (timeToTriggerA3)
    before it commences sending measurement reports to the serving RBS. These measurement reports
    contain measurements for the serving cells and up to three detected intra frequency neighbor cells.
    ThereportQuantityA3 parameter indicates whether RSRP or RSRQ measurements, or both, are to
    be included in the measurement reports.

    Measurement reports are sent periodically whilst the EventA3 condition is active. The
    parameter reportIntervalA3 determines the time interval between measurement reports. The
    parameter reportAmountA3 indicates how many reports to send; a value of 0 indicates that the
    reports should be sent indefinitely whilst the EventA3 condition is active.

    The user equipment uses the same offset and hysteresis values to determine when to leave EventA3
    when the serving cell improves in RSRP or RSRQ relative to the neighboring cells. The formula used
    by the UE is shown below:

    Mn + HysteresisA3 < Ms + a3offset

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