Wireless Curriculum Development SectionWireless Curriculum Development Section
ISSUEISSUE
ORA000006 CDMA2000 1X Call flowORA000006 CDMA2000 1X Call flow
3.63.6
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2
Course Contents
Chapter 1 Interfaces
Chapter 2 Registration Process
Chapter 3 Voice Call Flow
Chapter 4 Handoff
Chapter 5 Data Call Flow
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CDMA 1x BSS Network Structure
PSTNMSC
PDSN
Abis A10/A11
A1/A2
A3/A7
BSC
PCF
A8/A9Um
CDMA2000 1X BSS
MS
MS
BTS
BTS
BTS
BTS
BTS
BTS
BSC
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4
Course Contents
Chapter 1 Interfaces
Chapter 2 Registration Process
Chapter 3 Voice Call Flow
Chapter 4 Handoff
Chapter 5 Data Call Flow
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5
Registration ProcessMS BTS BSC MSC
REG (R-Signaling Link)
Base Ack (F-Signaling Link)
Accept (F-Signaling Link)
Location Update Request
Location Update Accept
Registration MsgACH
Base Ack OrderPCH
Registration Accepted OrderPCH
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6
Course Contents
Chapter 1 Interfaces
Chapter 2 Registration Process
Chapter 3 Voice Call Flow
Chapter 4 Handoff
Chapter 5 Data Call Flow
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Mobile Originated CallMS BTS BSC MSC
ORM (R-Signaling Link)Base Ack (F-Signaling Link)
Abis-BTS Setup (F-Signaling Link)
Abis-Connect (R-Signaling Link)Abis-Connect Ack (F-Signaling Link)
Abis-BTS Setup Ack (F-Signaling Link)Null data (F-Traffic Link)
ECAM (F-Signaling Link)
Preamble (R-Traffic Link)Base Ack (F-Traffic Link)
Idle Data (R-Traffic Link)MS Ack (R-Traffic Link)
Ser Connect (F-Traffic Link)
Ser Conn Comp (R-Traffic Link)
CM Service Request
Assignment Complete
Assignment Request
Origination MsgACH
Base Ack OrderPCH
Null Traffic DataTCHECAMPCH
Traffic Channel PreambleTCH
Base Ack OrderTCH
Idle TCH DataTCHMS Ack OrderTCH
Service Connect MsgTCHService Connect Complete
TCH
Null data (R-Traffic Link)
Ring Back ToneTCH
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Call Release (MS Initiated)MS BTS BSC MSC
Release Order (R-Traffic Link)
Release Order (F-Traffic Link)
Abis-BTS Release (F-Signaling Link)
Abis-Remove (R-Signaling Link)
Abis-Remove Ack (F-Signaling Link)
Abis-BTS Release Ack (F-Signaling Link)
Clear Request
Clear Command
Release OrderTCH
Release OrderTCH
Clear Complete
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Call Release (MSC Initiated)MS BTS BSC MSC
Release Order (R-Traffic Link)
Release Order (F-Traffic Link)
Abis-BTS Release (F-Signaling Link)
Abis-Remove (R-Signaling Link)
Abis-Remove Ack (F-Signaling Link)
Abis-BTS Release Ack (F-Signaling Link)
Clear Command
Release OrderTCH
Release OrderTCH
Clear Complete
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10
Course Contents
Chapter 1 Interfaces
Chapter 2 Registration Process
Chapter 3 Voice Call Flow
Chapter 4 Handoff
Chapter 5 Data Call Flow
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11
Handoff TypesHard handoff
MS terminates its communication with the original BTS before setting up communication with the new BTS. In such handoff, break-before-make technique is used.
Soft handoffDuring handoff MS establish connections with both original and target BTSs. In this way MS maintains communication with two or three sectors of different cells simultaneously.
Softer handoffIt is also similar to the Soft handoff, the only difference is it takes place between different sectors of the same BTS within the same frequency. In addition, the softer handoff adopts coherent combination for signals of different branches to achieve higher signal gain than the selective combination used in ordinary soft handoff.
NOTE: Softer handoff is not possible between two different frequency carriers
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Hard Handoff Process (Intra BSC)MS MSCBSS_DBSS_S
PSMM
Base Ack Order
Null Forward Traffic Frame
Handoff Direction Message
Traffic Channel Preamble
Handoff Completion Message
Base Ack Order
Handoff Perform
MS Ack Order
Reverse Traffic Channel Frames
Base Ack Order
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Hard Handoff Process (Inter BSC)BSS_DMS MSC
Handoff Required
Null Forward Traffic Channel Frames
Handoff CommandHandoff Direction Msg
MS Ack Order
Reverse Traffic Channel Frames & Traffic Channel Preamble
Base Ack Order
Clear Command
Clear Complete
Handoff complete
Handoff Request
Handoff Request Ack
Handoff Commenced
Handoff Completion Message
BSS_SPSMM
Base Ack Order
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Soft Handoff Process (Add Path)MS BSCBTS_D
PSMMAbis-IS-2000 FCH Rvs(Pilot Strength)
Abis-BTS Setup
Abis-Connect
Abis-Connect Ack
Abis-BTS Setup Ack
Abis-IS-2000 FCH Fwd(Forward Frame) Forward Traffic Frame
Abis-IS-2000 FCH Fwd(EHDM)
MS Ack Order
Extended Handoff Direction Msg
Abis-IS-2000 FCH Rvs(MS Ack) Handoff Completion Msg Abis-IS-2000 FCH Rvs(HCM)
Abis-IS-2000 FCH Fwd(Base Ack) Base Ack Order
Base Ack Order
BTS_S
Abis-IS-2000 FCH Fwd(Base Ack)
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Softer Handoff Process (Add Path)Sector_S BSC
PSMMAbis-IS-2000 FCH Rvs(Pilot Strength)
Abis-BTS Setup
Abis-ConnectAbis-Connect Ack
Abis-BTS Setup Ack
Abis-IS-2000 FCH Fwd(EHDM)Extended Handoff Direction Msg
MS Ack OrderAbis-IS-2000 FCH Rvs(Ms Ack)
Handoff Completion MsgAbis-IS-2000 FCH Rvs(HCM)
Abis-IS-2000 FCH Fwd(Base Ack)Base Ack Order
Base Ack OrderAbis-IS-2000 FCH Fwd(Base Ack)
MS Sector_D
During softer handoff, no resource is allocated at the Abis interface.
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Soft Handoff Process (Drop Path)
MS BTS_D BSCBTS_RPSMM Abis-IS-2000 FCH Rvs(Pilot Strength)
Abis-IS-2000 FCH Fwd(EHDM) Handoff Direction Message
Base Ack OrderAbis-IS-2000 FCH Fwd(Base Ack)
MS Ack OrderAbis-IS-2000 FCH Rvs(MS Ack)
Handoff Completion MsgAbis-IS-2000 FCH Rvs(HCM)
Abis-IS-2000 FCH Fwd(Base Ack) Base Ack OrderAbis-BTS Release
Abis-Remove
Abis-Remove Ack
Abis-BTS Release Ack
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Softer Handoff Process (Drop Path)
Sec_D BSC
Abis-IS-2000 FCH Fwd(EHDM)Handoff Direction Msg
PSMMAbis-IS-2000 FCH Rvs(Pilot Strength)
Handoff Completion MsgAbis-IS-2000 FCH Rvs(HCM)
Abis-IS-2000 FCH Fwd(Base Ack)Base Ack Order
MS Sec_R
MS Ack OrderAbis-IS-2000 FCH Rvs(Ms Ack)
Abis-IS-2000 FCH Fwd(Base Ack)Base Ack Order
Abis-BTS Release
Abis-Remove
Abis-Remove Ack
Abis-BTS Release Ack
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Course Contents
Chapter 1 Interfaces
Chapter 2 Registration Process
Chapter 3 Voice Call Flow
Chapter 4 Handoff
Chapter 5 Data Call Flow
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Mobile Packet data service states
MS BSS PCF PDSNTCH A8 A10
MS BSS PCF PDSNTCH A8 A10
MS BSS PCF PDSNTCH A8 A10
NULL :There are not any connections between the MS and Network.
ACTIVE:In this state, Traffic channel exists between MS and PDSN, and both sides may transmit data.
Dormant:No traffic channel exists between MS and PCF. But PPP connection and traffic channel on A10 are maintained.
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State Transitions
Active State Dormant State
Null State
Set up Um ,Abis ,A8 ,A10
Release Um ,Abis ,A8 ,A10
Set up Um ,Abis ,A8
Release Um ,Abis ,A8
Rele
ase
A10
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A8&A10 Connection Establishment procedure
BSMS MSC PCF PDSN
Assignment Complete
TCHEstablishment
Procedure
A9-Connect-A8
A9-Setup-A8
A11-Registration-Request
A11-Registration-Reply
Establishing PPP connection or Mobile IP Registration
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Null to Active (MS initiates)BSMS
Origination Msg
BS Ack Order
MSC
CM Service Request
Assignment Request
PCF PDSN
Assignment Complete
TCHEstablishment
Procedure
A9-Connect-A8
A9-Setup-A8A11-Registration-Request
A11-Registration-Reply
Establishing PPP connection or Mobile IP Registration
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Dormant to Active (MS initiates)
BSSMS
Origination
BS ACK Order
MSC
CM Service Request
Assignment Request
PCF PDSN
Assignment Complete
TCHEstablishment
Procedure
A9-Connect-A8
A9-Setup-A8
Dormant PPP connection is maintained
Active Packet Data Session
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Active to Dormant (MS initiates)
MS PDSNBS MSC PCF
Release Order
A9-Release-A8
A9-Release-A8 Complete
Clear Request
Clear Command
Clear Complete
Release Order
Dormant / PPP connected
Active / PPP connected
Release Message
Release Complete
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Active to Null (MS initiates)MS PDSNBSS MSC PCF
Clear Complete
Release OrderClear Request
Clear Command
A9-Release-A8
A9-Release-A8 Complete
A11 Registration Request
A11 Registration Reply
Release Order
Release Message
Release Complete
Active / PPP connected
Null State
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Dormant to Null Direct (MS power off)
Registration Message
Registration Accepted Order
Location Updating Request
Location Updating Accept
A9-Update-A8
A9-Update-A8-Ack
A11-Registration-Request
A11-Registration-Reply
MS BSS MSC PCF PDSN
Release Message
Release Complete
Dormant PPP connection is maintained
Null State