Section: 8.1 Uplink-downlink frame timing
Content: Transmission of the uplink radio frame number from the UE shall start seconds before the start of the corresponding downlink radio frame at the UE. Figure 8.1-1: Uplink-downlink timing relation Except for the cases mentioned in Table 8.1-1, Table 8.1-2 and Table 8.1-3, the range of is: . For frame structure type 1 and for frame structure type 2 unless stated otherwise in [4]. Note that not all slots in a radio frame may be transmitted. One example hereof is TDD, where only a subset of the slots in a radio frame is transmitted. is defined in different ranges depending on the UE configuration according to Table 8.1-1, Table 8.1-2 and Table 8.1-3. In case of subslot based transmission (Table 8.1-2 and Table 8.1-3), the UE is configured by higher layer signalling a processing timeline and an associated range of timing advance. The quantity is derived from the higher-layer parameters TACommon, TACommonDrift, and TACommonDriftVariation if configured (see Clause 4.2.3 in TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [4]), otherwise . The quantity is computed by the UE based on UE position and serving satellite-ephemeris-related higher-layers parameters if configured, otherwise . Table 8.1-1: Ranges of for a UE configured with SCG, short processing time or slot-based transmission in both DL and UL Table 8.1-2: Ranges of for a UE configured with subslot-based transmission in both DL and UL (dl-STTI-Length and ul-STTI-Length, see TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [9]. set to 'subslot') Table 8.1-3: Ranges of for a UE configured with subslot-based transmission in DL and slot-based transmission in UL (dl-STTI-Length and ul-STTI-Length, see TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [9], set to 'subslot' and 'slot', respectively) In all other cases the range of is: .