SRS (Sounding Reference Signal) LTE-5G Part-1| SRS Frequency Hopping

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The Sounding Reference Signal (SRS) is a reference signal transmitted by the UE in the uplink direction which is used by the eNodeB to estimate the uplink channel quality over a wider bandwidth. The eNodeB may use this information for uplink frequency selective scheduling.
Single SRS transmission is very simple one. After receiving RRC Connection Reconfiguration message with UE specific SRS configuration and parameter duration set to FALSE, the UE transmits SRS only once which is called ‘Single’ SRS transmission.
If the parameter duration is set to be TRUE, then the UE transmits Periodic SRS indefinitely until disabled.

srs-ConfigIndex defines SRS periodicity and an offset. The periodicity ranges from 2 ms to 320 ms.
srs-Bandwidth parameter defines the bandwidth that needs to be used while transmitting SRS in a subframe.

srs-HoppingBandwidth is defined for the purpose of frequency hopping of SRS. If frequency hopping of the SRS is enabled, then srs-HoppingBandwidth is smaller than srs-Bandwidth. SRS hopping procedure will also be discussed in detail.

freqDomainPosition defines the starting position of the SRS in the frequency domain

cyclicShift can vary from 1 to 8 which generates up to 8 different SRSs which are orthogonal to each other. The eNodeB can configure SRS for up to 8 UEs in the same subframe and frequency resources but to use different cyclic shift. The cyclic shift multiplexed signals need to have the same bandwidth to maintain the orthogonally.

transmissionComb: Actually, SRS is transmitted in every alternate (every even or every odd) subcarrier in the assigned SRS bandwidth. transmissionComb takes values 0 or 1 which informs whether to transmit SRS in every even or odd subcarrier in the assigned SRS bandwidth. By doing this the eNodeB can multiplex two UEs with same cyclicShift, frequency and time resources but different transmissionComb (0 or 1).
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