When no retuning is required, the UEs may be staggered in a different manner. FIG. 10 illustrates an example diagram 1000 of narrowband sounding for 3 subbands when retuning is not required. In this example, UE 1 may transmit an SRS in symbol 7 for subband 1, at symbol 8 for subband 2, and at symbol 9 for subband 3. Similarly, UE 2 and UE 3 may also transmit their SRSs in a staggered manner at adjacent symbols for the next subband. The staggered pattern used by UE1, UE2, and UE3 may be configured by the eNB.
FIG. 11 illustrates a diagram 1100 of wideband sounding. For wideband sounding, the UE may transmit more than one SRS in the subframe by repeating the same wideband SRS. Although this example illustrates the repetition of a wideband SRS, the repetition may also be for a subband SRS.
The UE may be configured to transmit the SRSs using a cover code. This allows multiple UEs to be multiplexed so that more UEs can sound the wideband/subbands. For example, repetitions may be multiplied by [1,1] for a first UE and by [1, ?1] for a second UE. Different shifts/combs may be used by the UE in different symbols.
