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Antenna ports An antenna port is defined by its associated reference signal. One frame consists of 10 subframes. Slot 0. One subframe consists of two slots. OFDM symbol Approximately One slot consists of 7 OFDM symbols. Each subcarrier is orthogonal to all other subcarriers. Subcarrier spacing is equal to the subcarrier bandwidth, which is 15 kHz, see Figure 2. An RE that is not used for transmission is referred to as a hole.

It covers 0. A scheduling block is the smallest downlink unit that can be scheduled to UE. Known cell-specific reference symbols are inserted into the resource grid. When transmitting with several antennas, each antenna must transmit a unique reference signal. When one antenna transmits its reference signal, the other antenna must be silent.

The mapping of the CRS on the resource grid therefore depends on the antenna configuration, see Figure 5. The pattern of CRS can be shifted in frequency compared to figure below. With two antenna ports the number is 16 and for four antenna ports Positioning reference signals are transmitted with a periodicity TP RS [ms], as specified by prsPeriod.

At each transmission occasion the position reference signals are sent in nsubf;con consecutive DL subframes. The number of consecutive DL subframes can be specified by nConsecutiveSubframes. In the figure below an example of the transmission scheme for PRS subframes is shown. For a configuration with two antennas, PRS is transmitted from one antenna at the time. The same antenna is used the entire PRS occasion. In the frequency domain, PBCH occupies 72 subcarriers in the middle of the band independent of deployed bandwidth.

The information sent on the PBCH channel in one subframe is retransmitted in the subsequent three radio frames. New data is transmitted only every fourth radio frame, every 40 ms. In this process, REs are excluded as if four antenna ports would have been configured, regardless of the actual number of configured antenna ports, see Figure 7.

Nothing is transmitted there, so they are regarded as holes. It is mapped on OFDM symbol 0 of the first slot in all downlink subframes. For bandwidth 1. This would lead to a reduced uplink peak rate, see Table Such a subframe is referred to as a sounding subframe. Only the last symbol is allocated for SRS. Note that these REs are always reserved in cells with the sounding functionality enabled regardless of whether there are UEs using sounding or not. The impact is considered negligible.

For larger bandwidths a frequency hopping SRS scheme is used. At each transmission occasion the entire SRS bandwidth is covered. In case of frequency hopping, a subset of the SRS bandwidth is used at each transmission occasion. Public Information Logo and Guidelines.

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