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HUAWEI TECHNOLOGIES CO., LTD.
All rights reserved
www.huawei.com
Internal
ORA0000006 CDMA 1x Call flow
ISSUE 3.2
HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved
Chapter 1 InterfacesChapter 1 Interfaces
Chapter 2 Registration ProcessChapter 2 Registration Process
Chapter 3 Voice Call FlowChapter 3 Voice Call Flow
Chapter 4 Handoff Chapter 4 Handoff
Chapter 5 Data Call FlowChapter 5 Data Call Flow
HUAWEI TECHNOLOGIES CO., LTD. Page 3All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 4All rights reserved
Chapter 1 InterfacesChapter 1 Interfaces
Chapter 2 Registration ProcessChapter 2 Registration Process
Chapter 3 Voice Call FlowChapter 3 Voice Call Flow
Chapter 4 Handoff Chapter 4 Handoff
Chapter 5 Data Call FlowChapter 5 Data Call Flow
HUAWEI TECHNOLOGIES CO., LTD. Page 5All rights reserved
Registration ProcessMS BTS BSC MSC
REG (R-Signaling Link)
Base Ack (F-Signaling Link)
Accept (F-Signaling Link)
MS Ack (R-Signaling Link)
Location Update Request
Location Update Accept
Registration MsgACH
Base Ack OrderPCH
Registration Accepted OrderPCH
MS Ack OrderACH
HUAWEI TECHNOLOGIES CO., LTD. Page 6All rights reserved
Chapter 1 InterfacesChapter 1 Interfaces
Chapter 2 Registration ProcessChapter 2 Registration Process
Chapter 3 Voice Call FlowChapter 3 Voice Call Flow
Chapter 4 Handoff Chapter 4 Handoff
Chapter 5 Data Call FlowChapter 5 Data Call Flow
HUAWEI TECHNOLOGIES CO., LTD. Page 7All rights reserved
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 DataTCH
ECAMPCH
Traffic Channel PreambleTCH
Base Ack OrderTCH
Idle TCH DataTCH
MS Ack OrderTCH
Service Connect MsgTCH
Service Connect CompleteTCH
Null data (R-Traffic Link)
Ring Back ToneTCH
HUAWEI TECHNOLOGIES CO., LTD. Page 8All rights reserved
Mobile Terminated Call
PRM (R-Signaling Link)
GPM (F-Signaling Link)
Paging Response ACH
GPMPCH
Paging Response
Paging Request
Assignment Complete
Assignment Request
TCH Establish Process
Base Ack (F-Signaling Link)Base Ack Order
PCH
MS BTS BSC MSC
Abis-BTS Setup (F-Signaling Link)
Connect
Ser Conn Comp (R-Traffic Link)Service Connect Complete
TCH
Alert (F-Traffic Link)Alert With Information
TCHMS Ack Order
TCHConnect
TCH Connect (R-Traffic Link)
Base Ack OrderTCH
MS Ack (R-Traffic Link)
Base Ack (F-Traffic Link)
HUAWEI TECHNOLOGIES CO., LTD. Page 9All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 10All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 11All rights reserved
Chapter 1 InterfacesChapter 1 Interfaces
Chapter 2 Registration ProcessChapter 2 Registration Process
Chapter 3 Voice Call FlowChapter 3 Voice Call Flow
Chapter 4 Handoff Chapter 4 Handoff
Chapter 5 Data Call FlowChapter 5 Data Call Flow
HUAWEI TECHNOLOGIES CO., LTD. Page 12All rights reserved
Handoff Types Hard 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 handoff
During 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 handoff
It 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
HUAWEI TECHNOLOGIES CO., LTD. Page 13All rights reserved
Hard Handoff Process (Intra BSC)MS MSCBSS_DBSS_S
PSMM
Handoff Perform
Base Ack Order
Null Forward Traffic Frame
Handoff Direction Message
MS Ack Order
Reverse Traffic Channel Preamble
Base Ack Order
Reverse Traffic Channel Frames
Handoff Completion Message
Base Ack Order
HUAWEI TECHNOLOGIES CO., LTD. Page 14All rights reserved
Hard Handoff Process (Inter BSC)BSS_DMS MSCBSS_S
PSMM
Base Ack OrderHandoff Required
Handoff Request
Null Forward Traffic Channel Frames
Handoff Request AckHandoff Command
Handoff Direction Message
MS Ack OrderHandoff Commenced
Reverse Traffic Channel Preamble
Base Ack Order
Reverse Traffic Channel Frames
Handoff Completion Message
Base Ack Order
Handoff completeClear Command
Clear Complete
HUAWEI TECHNOLOGIES CO., LTD. Page 15All rights reserved
Soft Handoff Process (Add Path)MS BSCBTS_DBTS_S
PSMM
Base Ack Order
Pilot Strength Measurement Report Message (R-traffic Link)
Base Ack Order (F-traffic Link)
Abis-BTS Setup (F-Signaling Link)
Abis-Connect (R-Signaling Link)
Abis-Connect Ack (F-Signaling Link)
Abis-BTS Setup Ack (R-Signaling Link)
Forward Frame (F-traffic Link)
Extended Handoff Direction Message
Forward Traffic FrameEHDM (F-traffic Link)
MS Ack OrderMS Ack Order (R-traffic Link)
Handoff Completion MessageHCM (R-traffic Link)
Base Ack OrderBase Ack Order (F-traffic Link)
HUAWEI TECHNOLOGIES CO., LTD. Page 16All rights reserved
Softer Handoff Process (Add Path)
During this process, no resource is
allocated at the Abis interface.
MS BSCBTSPSMM
Base Ack Order
Pilot Strength Measurement Report Message (R-traffic Link)
Base Ack Order (F-traffic Link)
Abis-BTS Setup (F-Signaling Link)
Abis-Connect (R-Signaling Link)
Abis-Connect Ack (F-Signaling Link)
Abis-BTS Setup Ack (R-Signaling Link)
Extended Handoff Direction Message
Forward Traffic FrameEHDM (F-traffic Link)
MS Ack OrderMS Ack Order (R-traffic Link)
Handoff Completion MessageHCM (R-traffic Link)
Base Ack OrderBase Ack Order (F-traffic Link)
:Source Sector :Destination Sector
HUAWEI TECHNOLOGIES CO., LTD. Page 17All rights reserved
Soft Handoff Process (Drop Path)
MS BSCBTS_
MBTS_D
PSMM
Base Ack Order
PSMM (R-traffic Link)
Base Ack 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 (R-Signaling Link)
Extended Handoff Direction MessageEHDM (F-traffic Link)
MS Ack OrderMS Ack Order (R-traffic Link)
Handoff Completion MessageHCM (R-traffic Link)
Base Ack OrderBase Ack Order (F-traffic Link)
HUAWEI TECHNOLOGIES CO., LTD. Page 18All rights reserved
Softer Handoff Process (Drop Path)
:Maintained Sector :Dropped Sector
MS BSCBTS
EHDM (F-traffic Link)Base Ack Order
PSMMPilot Strength Measurement Report Message (R-traffic Link)
Base Ack Order (F-traffic Link)
HCM (R-traffic Link)
Base Ack Order (F-traffic Link)
MS Ack Order
Handoff Completion Message
Base Ack Order
During this process, no resource is
released at the Abis interface.
Abis-BTS Release (F-Signaling Link)
Abis-Remove (R-Signaling Link)
Abis-Remove Ack (F-Signaling Link)
Abis-BTS Release Ack (R-Signaling Link)
Extended Handoff Direction Message
MS Ack Order (R-traffic Link)
HUAWEI TECHNOLOGIES CO., LTD. Page 19All rights reserved
Chapter 1 InterfacesChapter 1 Interfaces
Chapter 2 Registration ProcessChapter 2 Registration Process
Chapter 3 Voice Call FlowChapter 3 Voice Call Flow
Chapter 4 Handoff Chapter 4 Handoff
Chapter 5 Data Call FlowChapter 5 Data Call Flow
HUAWEI TECHNOLOGIES CO., LTD. Page 20All rights reserved
Mobile Packet Data Service StatesRelease traffic channels on Um ,Abis
,A8Setup traffic channel on
Um ,Abis ,A8Active
Dormant
Null
Setup traffic channel on
Um
,Abis ,A8,A10
Release traffi
c channels on all
interface
Rel
ease
tra
ffic
chan
nel o
n A1
0
Null State :There are not any
connections between the MS and
Network.
Active State :In this state, Traffic
channel exists between MS and
PDSN, and both sides may transmit
data.
Dormant State :No traffic channel
exists between MS and PCF. But PPP
connection and traffic channel on
A10 are maintained.
HUAWEI TECHNOLOGIES CO., LTD. Page 21All rights reserved
Null to ActiveBTS & BSC
MS MSC PCFPDSN
TCH Setup Process
Establishing PPP connection
Origination Message
Base Ack OrderCM Service Request
Assignment Request
A9-Setup-A8
A9-Connect-A8
A11-Registration-Request
A11-Registration-Reply
Assignment Complete
To be continued
HUAWEI TECHNOLOGIES CO., LTD. Page 22All rights reserved
PPP Establishment Process (Simple IP)MS
Home AAA
Local AAA
PDSN
TCH ,A8 & A10 ConnectionEstablishment Process
Transmitting Traffic Data
LCP-Configure-Request
LCP-Configure-Response
CHAP-Authenticate-Challenge
CHAP-Authenticate-Response
CHAP-Authenticate-Result
IPCP-Configure-Request
IPCP-Configure-Response
Access-Request
Access-Response
Access-Request
Access-Request
HUAWEI TECHNOLOGIES CO., LTD. Page 23All rights reserved
R-SCH Maintenance ProcessMS BTS BSC
SCRM (R-Traffic Link)
Base Ack Order
Supplemental Channel Request Message
Base Ack Order (F-Traffic Link)
Abis BTS Setup (F-Signaling Link)
Abis Connect (R-Signaling Link)
Abis Connect Ack (F-Signaling Link)
Abis Burst Request (F-Signaling Link)
Abis Burst Response (R-Signaling Link)
Abis BTS Setup Ack (R-Signaling Link)
Abis Burst Commit (F-Signaling Link)
ESCAM (F-Traffic Link)Extended Supplemental Channel Assignment Message
High Speed Data on SCH
Abis Burst Release (F-Signaling Link)
Abis Terrestrial circuit for SCH
establish process (optional)
HUAWEI TECHNOLOGIES CO., LTD. Page 24All rights reserved
F-SCH Maintenance ProcessMS BTS BSC
Abis BTS Setup (F-Signaling Link)
Abis Connect (R-Signaling Link)
Abis Connect Ack (F-Signaling Link)
Abis BTS Setup Ack (R-Signaling Link)
High Speed Data on SCH
Abis Burst Release (F-Signaling Link)
Abis Burst Request (F-Signaling Link)
Abis Burst Response (R-Signaling Link)
Abis Burst Commit (F-Signaling Link)
ESCAM (F-Traffic Link)Extended Supplemental Channel Assignment Message
Abis Burst Request (F-Signaling Link)
Abis Burst Response (R-Signaling Link)
Abis Burst Commit (F-Signaling Link)
ESCAM (F-Traffic Link)Extended Supplemental Channel Assignment Message
Abis Terrestrial circuit for SCH
establish process (optional)
F-SCH duration extending process
(optional)
HUAWEI TECHNOLOGIES CO., LTD. Page 25All rights reserved
Dormant to Active (MS initiates)BTS & BSC
MS MSC PCFPDSN
Active Packet Data Session & Traffic Data transmitting
TCH Setup Process
Origination Message
Base Ack OrderCM Service Request
Assignment Request
A9-Setup-A8
A9-Connect-A8
Assignment Complete
In dormant state ,traffic channel on A10 & PPP
connection are maintained.
HUAWEI TECHNOLOGIES CO., LTD. Page 26All rights reserved
Dormant to Active (PDSN initiates)BTS & BSC
MS MSC PCFPDSN
TCH Setup Process
Active Packet Data Session & Traffic Data transmitting
GPM
Paging Response MessagePaging Response
Assignment Request
A9-Setup-A8
A9-Connect-A8
Assignment Complete
In dormant state ,traffic channel on A10 & PPP
connection are maintained.
Traffic Data Packet A9-BS Service Request
BS Service Request
BS Service Response
A9-BS Service Response
Paging Request
Base Ack Order
HUAWEI TECHNOLOGIES CO., LTD. Page 27All rights reserved
Active to Dormant (MS initiates)
BTS & BSC
MS MSC PCFPDSN
Release Order
Release Order
Clear Request
Clear Command
A9-Release-A8
A9-Release-A8 Complete
Clear Complete In dormant state ,traffic channel on A10 & PPP
connection are maintained.
HUAWEI TECHNOLOGIES CO., LTD. Page 28All rights reserved
Active to Dormant (BSC initiates)
In dormant state ,traffic channel on A10 & PPP
connection are maintained.
BTS & BSC
MS MSC PCFPDSNClear Request
Release Order
Release Order
Clear Command
A9-Release-A8
A9-Release-A8 Complete
Clear Complete
HUAWEI TECHNOLOGIES CO., LTD. Page 29All rights reserved
Active to Null (MS initiates)BTS & BSC
MS MSC PCFPDSN
Release Order
Clear Request
Release Order
Clear Command
A9-Release-A8
A9-Release-A8 Complete
Clear Complete
A11-Registration-Request
A11-Registration-Reply
HUAWEI TECHNOLOGIES CO., LTD. Page 30All rights reserved
Active to Null (PDSN initiates)BTS & BSC
MS MSC PCFPDSN
A11-Registration-Update
A11-Registration-Ack
A11-Registration-Request
A11-Registration-Reply A9-Disconnect-A8
A9-Release-A8
Clear Request
Release Order
Release OrderClear Command
Clear Complete
A9-Release-A8 Complete
HUAWEI TECHNOLOGIES CO., LTD. Page 31All rights reserved
Active to Null (MSC initiates)BTS & BSC
MS MSC PCFPDSN
Release Order
Release Order
Clear Command
A9-Release-A8
A9-Release-A8 Complete
Clear Complete
A11-Registration-Request
A11-Registration-Reply
HUAWEI TECHNOLOGIES CO., LTD. Page 32All rights reserved
Dormant to Null Direct (MS power off)BTS & BSC
MSC PCFPDSN
MS
Registration Message
Location Updating Request
Location Updating Accept
A9-Update-A8
A11-Registration-Request
A11-Registration-Reply
A9-Update-A8 Ack
Registration Accepted Order
MS Ack Order
Base Ack Order
In dormant state ,traffic channel on A10 & PPP
connection are maintained.
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