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Airbridge cBTS3612 CDMA Base Station
3)
MSC sends "Assignment Request" message to BSC to request BSS to assign
radio resources.
4)
BSC sends "Abis-BTS Setup" message to BTS, to request BTS to allocate
radio resources for the call.
5)
BTS sends "Abis-Connect" message to BSC, to establish Abis service
connection.
6)
BSC sends "Abis-Connect Ack" to BTS in response to the "Abis-Connect"
message.
7)
After resources allocation, BTS sends "Abis-BTS Setup Ack" message to BSC.
8)
BSC sends "Abis-IS2000 FCH Fwd" message to BTS, and orders BTS to send
null frame to MS.
9)
After receiving "Abis-IS2000 FCH Fwd" message, BTS sends idle frame to BSC
via "Abis-IS2000 FCH Rvs" message, and performs Abis link delay adjustment.
10) BSC sends channel assignment message to BTS via "Abis-PCH Msg Transfer"
message. BTS forwards the channel assignment message to MS on paging
channel.
11) MS begins to send traffic channel preamble on the assigned reverse traffic
channel. After BTS captures the preamble, it sends traffic channel preamble to
BSC via "Abis-IS2000 FCH Rvs" message.
12) After BSC receives traffic channel preamble from MS, BSC sends "Base Ack"
order to BTS via "Abis-IS2000 FCH Fwd" message; BTS will send "Base Ack
Order" to MS on the forward traffic channel.
13) After MS receives "Base Ack Order", it stops sending traffic channel preamble
and starts to send data frame.
14) After MS receives "Base Ack Order", it sends "MS Ack Order" to BTS. BTS
forwards the message to BSC via "Abis-IS2000 FCH Rvs" message.
15) On receiving "MS Ack" order, BSC sends "Service Connect" message to BTS
via "Abis-IS2000 FCH Fwd" message, then BTS forwards the message to MS.
MS starts to handle the traffic according to the designated service
configuration.
16) To respond to service connection message, MS sends "Service Connect
Complete" message.
17) On receiving the "Service Connect Complete" message, BSC sends
"Assignment Complete" message to MSC.
II. MS-terminated call (MTC)
MS-terminated call procedure is shown in Figure 4-5.
4-4
System Description
4 System Function
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