That is why the SSS is different in both subframes and therefore, after decoding the SSS, the UE can understand which is the 1st subframe. As SSS & PSS exist in both Subframe 1 and 6, so the UE needs to know which of the frame is the 1st subframe. Next thing to find out is the start of the frame.Since the location of SSS and PSS differs in TDD and FDD so the UE can also find out the frame type.UE gets to know the CP length as it has the duration of two consecutive symbols (SSS and PSS) so it can derive whether the eNB is using normal CP or extended CP.After decoding SSS, the UE gets the following information. The PSS is on the 7th symbol of the 1st slot of 1st & 6th subframe while SSS lies on the 6th symbol. It provides the center frequency as it is around the DC carrier.Īfter this, the UE starts looking for the Secondary Synchronization Signal (SSS) which is just one symbol before the PSS.PSS gives the slot boundary timing independant of the CP length, so syncs at slot level.So, once the UE has decoded the PSS, it gets the following information. The location of PSS is in the 1st and 6th subframe of LTE and within the subframe it exists on the last symbol of the slot. The first thing UE needs to do is to search for Primary Synchronization Signal (PSS).
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