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Thread: SINR and RSRQ in LTE

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    SINR and RSRQ in LTE

    Can anyone explain in detail the difference between RSRQ and SINR in LTE? How is each measured/calculated? What are the pros and cons of each of them?

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    RSRQ - Reference Signal Received Quality: Quality considering also RSSI and the number of used Resource Blocks (N) RSRQ = (N * RSRP) / RSSI measured over the same bandwidth. RSRQ is a C/I type of measurement and it indicates the quality of the received reference signal. The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision.
    In formula:
    RSRQ = N x RSRP / RSSI

    N is the number of Physical Resource Blocks (PRBs) over which the RSSI is measured, typically equal to system bandwidth
    RSSI is pure wide band power measurement, including intracell power, interference and noise
    The reporting range of RSRQ is defined from -3…-19.5dB


    SINR Definition
    SINR is the reference value used in the system simulation and can be defined:

    Wide band SINR
    SINR for a specific subcarriers (or for a specific resource elements)

    SINR = S/(I+N), all measured over the same bandwidth

    Last edited by telecominfo; 06-20-2014 at 10:37 PM.

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    This is from 3GPP TS 36.214



    Definition:

    Reference Signal Received Quality (RSRQ) is defined as the ratio N×RSRP/(E-UTRA carrier
    RSSI), where N is the number of RB"s of the E-UTRA carrier RSSI measurement bandwidth. The
    measurements in the numerator and denominator shall be made over the same set of resource
    blocks.
    E-UTRA Carrier Received Signal Strength Indicator (RSSI), comprises the linear average of the
    total received power (in [W]) observed only in OFDM symbols containing reference symbols for
    antenna port 0, in the measurement bandwidth, over N number of resource blocks by the UE
    from all sources, including co-channel serving and non-serving cells, adjacent channel
    interference, thermal noise etc.
    The reference point for the RSRQ shall be the antenna connector of the UE.
    If receiver diversity is in use by the UE, the reported value shall not be lower than the
    corresponding RSRQ of any of the individual diversity branches

    Aplicable for:
    RRC_IDLE intra-frequency,
    RRC_IDLE inter-frequency,
    RRC_CONNECTED intra-frequency,
    RRC_CONNECTED inter-frequency


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    Hi,
    Can you explain the difference between the RSRQ in Idle and Connected.
    BR,


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    Quote Originally Posted by ahmadzubi View Post
    Can anyone explain in detail the difference between RSRQ and SINR in LTE? How is each measured/calculated? What are the pros and cons of each of them?
    One key disadvantage of RSRQ is the fact that: your own traffic generates RSRQ degradation. Since it pretty much compares RS Power and RSSI, once you start a full buffer session, for example, all the non-RS PRBs will be assigned to you, which will increase the RSSI, therefore, RSRQ will reduce.

    That said, always go for SINR.


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