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User Manual
Airbridge cBTS3612 CDMA Base Station
MS
GPM
PCH
Paging Response
ACH
Base Ack Order
PCH
Null Traffic Data
TCH
ECAM
PCH
Traffic Channel Preamble
TCH
Base Ack Order
TCH
Idle TCH Data
TCH
MS Ack Order
TCH
Service Connect Msg
TCH
Service Connect Complete
TCH
Figure 4-5 MS-terminated call procedure
1)
MSC sends "Paging Request" to BSC.
2)
BSC constructs General Paging Message (GPM), embeds it into"Abis-PCH
Msg Transfer" message, then sends it to BTS. BTS sends the GPM on the
paging channel.
3)
After MS receives paging message, it sends "Paging Response" message
(PRM) to BTS. BTS forwards it to BSC in "Abis-ACH Msg Transfer" message.
4)
BSC sends "CM Service Request" message to MSC, to request service
assignment.
5)
BSC sends "Base Ack" order to BTS via "Abis-PCH Msg Transfer" message.
BTS sends the "Base Ack" order on the paging channel.
6)
MSC sends assignment request message to BSC, to request BSS to assign
radio resources.
7)
BSC sends "Abis-BTS Setup" message to BTS, to request BTS to allocate
radio resource for the call.
8)
BTS sends "Abis-Connect" message to BSC, to establish Abis service
connection.
BTS
Abis-PCH Msg Transfer(GPM)
Abis-ACH Msg Transfer(PRM)
Abis-PCH Msg Transfer(Base Ack)
Abis-BTS Setup
Abis-Connect
Abis-Connect Ack
Abis-BTS Setup Ack
Abis-IS2000 FCH Fwd(Null data)
Abis-IS2000 FCH Rvs(Idle data)
Abis-PCH Msg Transfer(ECAM)
Abis-IS2000 FCH Rvs(Preamble)
Abis-IS2000 FCH Fwd(Base Ack)
Abis-IS2000 FCH Rvs(Idle Data)
Abis-IS2000 FCH Rvs(Ms Ack)
Abis-IS2000 FCH Fwd(Service Connect)
Abis-IS2000 FCH Rvs(Ser Conn Comp)
4-5
System Description
4 System Function
BSC
MSC
Paging Request
CM Service Req
Assignment Req
Assignment Complete
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
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