8 Timing
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
8.1 Uplink-downlink frame timing
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 [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
|
Range of |
Condition |
|
|
if the UE is configured with a SCG |
|
|
if the UE is configured with shortProcessingTime (see TS 36.331 [9]) |
|
|
if the UE is configured with dl-STTI-Length and ul-STTI-Length (see TS 36.331 [9]) set to ‘slot’ for the serving cell |
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 [9]. set to ‘subslot’)
|
Range of |
proc-Timeline |
|
|
nplus4set1 |
|
|
nplus6set1 |
|
|
nplus6set2 |
|
|
nplus8set2 |
|
NOTE 1: See TS 36.331 [9] |
|
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 [9], set to ‘subslot’ and ‘slot’, respectively)
|
Range of |
proc-Timeline |
|
|
nplus4set1 |
|
|
nplus6set1 |
|
|
nplus6set2 |
|
|
nplus8set2 |
|
NOTE 1: See TS 36.331 [9] |
|
In all other cases the range of 
is: 
.