Frame synchronization in LTE-LAA

Frame synchronization in LTE is done using PSS, SSS which occur periodically in slot0 and slot10 of every frame.

While in LTE-LAA, its not guaranteed slot0 and slot10 of the frame reach UE
as expected in legacy LTE, as channel is not assumed to be always free.
Then how frame synchronization is done in LTE-LAA?

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