Call Procedure; Speech Service Call Procedure - Huawei Airbridge cBTS3612-1900 User Manual

User Manual
Airbridge cBTS3612 CDMA Base Station

4.2 Call Procedure

Call procedure mainly includes speech service call procedure and data service call
procedure. This section gives some typical examples to introduce the MS call
procedures.

4.2.1 Speech Service Call Procedure

I. MS-origina ted call (MOC)
MS-originated call procedure is illustrated in Figure 4-4.
MS
Origination Msg
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 4-4 MS-originated call procedure
1) MS sends "Origination Message" on access channel. On receiving the
message, BTS sends "Abis-ACH Msg Transfer" message to BSC.
2) BSC sends "CM Service Request" message to MSC, to request service
assignment. Meanwhile, BSC sends "Base Ack" order to BTS via "Abis-PCH
Msg Transfer" message. BTS sends "Base Ack Order" on paging channel to the
MS.
BTS
Abis-ACH Msg Transfer(ORM)
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)
4-3
System Description
4 System Function
MSC
BSC
CM Service Req
Assignment Req
Assignment Complete
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)