Section: 4.1 Frame structure type 1
Content: Frame structure type 1 is applicable to both full duplex and half duplex FDD only. Each radio frame is long and consists of 10 subframes of length , numbered from 0 to 9. Subframe in frame has an absolute subframe number where is the system frame number. For subframes using , , or , subframe is defined as two slots, and , of length each. For subframes using , subframe is defined as one slot, , of length . For transmissions using , a slot has a length of 92160. There are 13 slots, numbered in increasing order from 0 to 12, in a 40 ms period starting at with slot 0 starting at in the 40 ms period. For subframes using , the subframe can further be divided into six subslots according to Table 4.1-1. Downlink subslot pattern 1 is applied if the number of symbols used for PDCCH is equal to 1 or 3 and downlink subslot pattern 2 is applied if the number of symbols used for PDCCH is equal to 2. For system bandwidths , subslot transmission is not supported in case 4 symbols used for PDCCH. For FDD, 10 subframes, 20 slots, or up to 60 subslots are available for downlink transmission and 10 subframes, 20 slots, or up to 60 subslots are available for uplink transmissions in each 10 ms interval. Uplink and downlink transmissions are separated in the frequency domain. In half-duplex FDD operation, the UE cannot transmit and receive at the same time while there are no such restrictions in full-duplex FDD. Figure 4.1-1: Frame structure type 1 (assuming ). Table 4.1-1: SC-FDMA/OFDM symbols in different subslots of subframe i