Service Manual

GSM-204-323
CTU frequency hopping
31st Oct 01
Technical Description: Horizon macro outdoor
68P02902W02-A
CONTROLLED INTRODUCTION
Tech. 5–21
SFH example
not through
BCCH
CTU 0
In this example of SFH, CTU 0 provides the BCCH and cannot frequency hop.
CTU 0 has to transmit at maximum cell site power to meet the BCCH
requirement. Timeslots are used as shown below:
 TS 0 = Combined BCCH TS (BCCH/CCCH/DCCH). Transmitted at
maximum cell site power.
 TS 1-7 = Traffic channels, all non-hopping. All traffic channels transmit at
maximum cell site power.
CTU 1 and additional CTUs
CTU 1 and any additional CTUs provide SFH traffic channels as shown below:
 TS 0-7 = Frequency hopping traffic channels. The frequency allocated to
the BCCH of CTU 0 cannot be used for frequency hopping purposes.
SFH example
hopping
through BCCH
carrier
CTU 0
In this example of SFH, CTU 0 provides the BCCH and cannot frequency hop.
CTU 0 has to transmit at maximum cell site power to meet the BCCH
requirement. Timeslots are used as shown below:
 TS 0 = Combined BCCH timeslot (BCCH/CCCH/DCCH). Transmitted at
maximum cell site power.
 TS 1-7 = Unused timeslots transmitting dummy bursts for BCCH. All
channels transmit at maximum cell site power.
CTU 1 and additional CTUs
CTU 1 and any additional CTUs provide SFH traffic channels as shown below:
 TS 0 = Frequency hopping traffic channel, but prevented from using
BCCH frequency.
 TS 1-7 =Frequency hopping traffic channels, using all available
frequencies, including BCCH.
When the SFH selects the BCCH frequency, the CTU transmits at maximum cell
site power and the corresponding TS on CTU 0 is switched off for this period.