Tcell (Frame timing offset of a cell)
Table: Frame timing offset of a cell
Parameter nameFrame timing offset of a cell
Abbreviated nameTcell
3GPP nameTcell
Managed objectWCEL
Parameter group-
CategoryTelecom
Multiplicity1
DescriptionEach cell in a BTS uses a System Frame Number (SFN) counter, which is the BTS Frame Number (BFN) counter delayed by a number of chips defined by the value of Tcell.
Tcell is used for defining the start of SCH, CPICH, Primary CCPCH and DL Scrambling Code(s) in a cell relative to BFN. The main purpose is to avoid having overlapping SCHs in different cells belonging to the same BTS. An SCH burst is 256 chips long.
The values can be chosen as follows: 0 chips for the 1st cell of the BTS, 256 chips for the 2nd cell of the BTS, 512 chips for the 3rd cell of the BTS, etc.
Note: Changing the parameter value will start the cell shutdown procedure in the BTS.
Nokia BTS shall control HSDPA cell allocation so that only cells belonging to the same Tcell group are allocated to the same MAC-hs entity.
Group 1: Tcell values 0 (0 chips), 1 (256 chips) and 2 (512 chips)
Group 2: Tcell values 3 (768 chips), 4 (1024 chips) and 5(1280 chips)
Group 3: Tcell values 6 (1536 chips), 7 (1792 chips) and 8 (2048 chips)
Group 4: Tcell value 9 (2304 chips)
Range0 chips (0), 256 chips (1), 512 chips (2), 768 chips (3), 1024 chips (4), 1280 chips (5), 1536 chips (6), 1792 chips (7), 2048 chips (8), 2304 chips (9)
Step-
Unit-
Formula for getting internal valuegui ==> internal
0 chips ==> 0
256 chips ==> 1
512 chips ==> 2
768 chips ==> 3
1024 chips ==> 4
1280 chips ==> 5
1536 chips ==> 6
1792 chips ==> 7
2048 chips ==> 8
2304 chips ==> 9
Default value-
Default value notesDefault value is not possible
Related functions-
System information-
ModificationCell shutdown is needed
Related parameters-
Parameter relationships-
Related features-
Interfaces•RNC <-> WBTS
•RAC <-> RNC
•EM <-> RNC
•RACApp <-> RAC
References•3GPP Reference: TS 25.402, Synchronisation in UTRAN Stage 2
Location in RNC GUIRNC RNW Object Browser/WCDMA Cell-dialog/General-tab
RAC DB TableC_WCEL
RAC DB ColumnWCEL_T_CELL
RAC Planning interface nameTcell
RAC user interface name-