02-Ora000006 Cdma2000 1x Call Flow Issue5.6

Wireless Curriculum Development SectionWireless Curriculum Development Section

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ORA000006 CDMA2000 1X Call flowORA000006 CDMA2000 1X Call flow

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Confidential Information of Huawei. No Spreading without Permission. Security Level: Internal

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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Course Contents




Chapter 4 Handoff



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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Course Contents




Chapter 4 Handoff



7

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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Course Contents




Chapter 4 Handoff



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


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)


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




MS Sec_R

MS Ack OrderAbis-IS-2000 FCH Rvs(Ms Ack)


Abis-BTS Release

Abis-Remove

Abis-Remove Ack

Abis-BTS Release Ack


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Course Contents




Chapter 4 Handoff



19

Mobile Packet data service states

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


22

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


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


MS BSS MSC PCF PDSN

Release Message

Release Complete

Dormant PPP connection is maintained

Null State


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02-Ora000006 Cdma2000 1x Call Flow Issue5.6