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Defined in TS38.104 as a requirement for the base station. This requirement applies to the frame timing in TX diversity, MIMO transmission, carrier aggregation, and their combinations. And this requirement is defined due to the frames of the NR signals present at the BS transmitter antenna connectors or TAB connectors not perfectly aligned in time. The RF signals at the BS transmitter antenna connectors or transceiver array boundary may experience certain timing differences in relation to each other.