Cell-specific DL Reference Signal

//Cell-specific DL Reference Signal

Cell-specific DL Reference Signal

Cell-specific DL Reference Signal

Cell-specific DL Reference Signal

A downlink (DL) Reference Signal (RS) is inserted into the resource blocks and transmitted together with data.

Since the RS is known to both the eNb and UE, the UE will use the RS to estimate the channel condition first, then demodulate the data based on the estimated channel response.

As shown in figure, each RS occupies one resource element and is distributed in both the time and frequency domains. This two dimension distribution helps with the accuracy of channel estimation.

The channel condition varies from time to time and from frequency to frequency. Two physical consecutive resource blocks within the same time slot may experience different interference and have different channel conditions.

The location of the RS is fixed in time domain. For e.g., if there are two antennas in the eNB, the RSs locate in OFDM symbol 0 and 4 of each slot.

But the sub-carriers occupied by the RS vary in frequency domain depending on Physical Cell ID.

Also, the number of RSs in a resource block vary with the number of antennas at the eNB; the more the antennas, the more RSs.

You may also like to go through What is RF Optimization?, 4G-LTE KPIs, 3GPP Accessibility KPI, Retainability KPI in LTEThroughput KPI & Latency KPI, Mobility KPICell Availability KPI in LTE. and Coverage of an LTE Cell.

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