Hi sanj
1)combined mode(light load signaling)
BCCH on TS0 contained 4 subchannel.
SDCCH on TS0 contained 4 subchannel.
7 TCH on the remaining 7 TSs on TRX1 & the whole 16 TSs on TRX2 & TRX3.
2)Not combined mode(heavy load signaling)
BCCH on TS0 contained 4 subchannel.
SDCCH on TS1 contained 8 subchannel.
TCH on tha remaining 6 TSs & 16 TSs on (TRX2 , TRX3).
## Further more you can add more SDCCH if your signaling is still heavy.