User Manual
iSiteC BTS3601C CDMA Base Station
System Description
Chapter 3 System Function
3-4
11) BSC sends “Abis-IS2000 FCH Fwd” message to BTS to request BTS to send
null frame to MS.
12) After receiving “Abis-IS2000 FCH Fwd” message, BTS sends null frame to BSC
via “Abis-IS2000 FCH Rvs” message, and performs Abis link delay adjustment.
13) BSC sends channel assignment message to BTS via “Abis-PCH Msg Transfer”
message. BTS forwards the message to MS on paging channel.
14) MS begins to send traffic channel preamble on the assigned reverse traffic
channel. After capturing the preamble, BTS sends traffic channel preamble to
BSC via “Abis-IS2000 FCH Rvs” message.
15) After BSC receives the traffic channel preamble sent from MS, it sends “BS Ack
Order” to BTS via “Abis-IS2000 FCH Fwd” message. BTS forwards the order to
MS over the forward traffic channel.
16) After MS receives “BS Ack Order”, it stops sending traffic channel preamble and
starts sending data frame.
17) After MS receives “BS Ack Order", it sends “MS Ack Order" to BTS. BTS
forwards the order to BSC via “Abis-IS2000 FCH Rvs” message.
18) After BSC receives “MS Ack Order", it sends service connection message to
BTS via “Abis-IS2000 FCH Fwd” message. BTS forwards the message to MS,
and then MS starts to handle the service according to the designated service
configuration.
19) To respond to service connection message, MS sends "Service Connect
Complete" message.
20) After BSC receives the "Service Connection Complete" message, it sends
"Assignment Complete" message to MSC.
3.1.2 Data Service Call Procedure
I. Mobile originated data service
The mobile originated data service procedure is shown in Figure 3-3. In the figure, the
BSS represents BTS and BSC.
