04 System Structure of ZXC10 MGW%26MSCe%26HLRe_0702 (1)

ZTE UniversityZTE UniversityZTE University univ.zte.com.cnuniv.zte.com.cnuniv.zte.com.cnThe information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited.

System Structure of ZXC10 MGW/MSCe/HLRe

V0702

ZTE UniversityMobile-MSS/WDSS Group


Understand System Structure of ZXC10 MGW

Understand System Structure of ZXC10 MSCe

Understand System Structure of ZXC10 HLRe

Course Objectives


Agenda

Architecture of ZXC10 MGWArchitecture of ZXC10 MSCeArchitecture of ZXC10 HLRe


Control Plane Processing Unit

ZXC10-MGW

IP Access Unit

DT Unit PSTN/PLMN

No.7 Network

IP Network

Function Structure of ZXC10 MGW

Circuit Switching Unit

IP Switching Unit

Media ResourceUnit

TranscodingUnit

SS7 SignalingUnit


Logical Units of ZXC10 MGW

• The MGW can be functionally divided into：– IP Access Unit– IP Switching Unit– Digital Trunk Unit– Circuit Switching Unit– Transcoding Unit– Control Plane Processing Unit– Clock Unit


IP Access Unit

• This IP Access Unit provides interfaces such as FE, GE, implements RTP/UDP/IP processing.

UIM

MPB

OMP

BPSN

BCTC

BCTC/OMC

Small

Capacity

Large

Capacity


IP Switching Unit

• Here the IP switching refers to the media plane IP switching. It exists in the resource subsystem and the core packet switching subsystem.

Media plane IP switching in the core packet switching subsystem


Digital Trunk Unit (TDM Access)

• The digital trunk unit implements the voice access from the PSTN/PLMN or 2G BSC.

Othercontrol bus

To controlstream

Ethernet

TDM bus

Controlstream

Ethernet

TDM bus

SDTB DTB/DTEC

Other controlbus

MPB

Small

Capacity

UIMU

OMP

Large

Capacity

BCTC

BCSN

BCTC/OMC


Circuit Switching Unit

• The circuit switching unit implements the T net switching with capacity of 64k~256k.

• The circuit switching unit consists of TSNB (with a maximum switching capacity of 256k) and TFI.


Transcoding Unit

• The transcoding unit implements transcoder and media resources functions(Conference call, Tone/Voice, DTMF, MFC, and so on)

UIM

UIM

MPB

OMP


• Though MS1 and MS2 adopt EVRCs of the same type, two transcoders are still used on the bearer path to convert EVRC into G.711 and then to convert G.711 to EVRC for the interworking of the media streams between the two MSs. This is the traditional tandem operation. TrFO tries best to avoid it.

Typical tandem operation

BSCBSC BSCBSCTranscoder Transcoder

Core Network

EVRC voice EVRC voiceG.711 voice G.711 voice


• TrFO: Transcoder Free Operation– TrFO means that compressed voice is transferred

between traditional MSs through the bearing channel of a packet-based network without a codec 。

• RTO: Remote Transcoder Operation– For the RTO, a transcoder is configured at the remote

call side. RTO involves MS-MS RTO and MS-PSTN RTO.

TrFO/RTO


• When the codec formats of the two MS are compatible, no transcoder is required during the voice transmission, Compared with the Tandem structure, TrFO operation can save transcoder resource and IP network resource.

TrFO: Mobile to Mobile

In 3GCN, Transcoder Integrated in MGW

Transcoder TranscoderEVRC

EVRC

EVRC

MS1 MS2


• When the codec formats of the two MSs are not compatible, only one transcoder is required, Compared with the Tandem structure, RTO only requires one-stage transcoding, improving the call quality.

RTO: Mobile to Mobile

In 3GCN, Transcoder Integrated in MGW


EVRC

EVRC

13K

13K 13K

MS1 MS2


• Only one transcoder need be set on the bearer channel between the MS and PSTN subscribers converting compressed voice into PCM and vice versa.

RTO: MS-to-PSTN / PSTN-to-MS


EVRC

EVRC

PCM

PCM PCM

MS1 PSTN


TrFO & RTO

EVRC VoiceEVRC Voice

EVRC Voice

BSC

MSCeMSCeMSCe

IP Network

BSC

MSCeMSCeMSCe

SIP-TSIPSIP--TT

BTS

PSTN

TrFO

RTO

G.711 VoiceMGW MGW


Control Plane Processing Unit

• The MPB implements these functions: converging and processing the control plane media streams, call control, signaling processing, and operation & maintenance.

• The SPB connects to the SS7 network for processing SS7 MTP-2. • The MNIC connects to the IP network for processing the protocols in the IP

domain.


Clock Unit


Signaling Processing in ZXC10 MGW

ISUP/TUP

MTP3

MTP2

MTP1

TDM

ISUP/TUP

MTP3

MTP2

TDM

ISUP/TUP

MTP3

IP

ISUP/TUP

MTP3

IP

ISUP/TUP

IPISUP/TUP

Sigtran

ISUP/TUP

IP


Media Stream in ZXC10 MGW


Agenda



ZXC10 MSCe Main Functions

Support multiple interfaces including E1/T1/SDH/Ethernet etc.

Support multiple protocols including Megaco/H.248, SIP-T,

Sigtran, SS7, etc.

Act as VMSCe, GMSCe or TMSCe

Embedded SGW/SSP functions


Function Structure of ZXC10 MSCe

IP switching unit

SS7 signaling unit

IP protocol unit

MSCe

IP network

SS7 network

ISUP/TUP

MTP3

MTP2

MTP1

TDM

ISUP/TUP

MTP3

IP

ISUP/TUP/H.248

Sigtran


Logical Units of ZXC10 MSCe

• The MSCe can be functionally divided into：– Access Unit– Switching Unit– Processing Unit– Clock Unit


Access Unit

• Access Unit provides 2 kinds of external interfaces: – IP interface: 100M access (MNIC )– SS7 interface: E1 access (SPB)


Switching Unit

• Switching Unit includes 2 kinds of boards: – UIM: UIMC.

– CHUB: Implements Ethernet interconnection between each signaling control subsystem and the main control subsystem.


Clock Unit


Agenda



ZXC10 HLRe Main Functions

Mobility management function

Basic call function

Data service function

SMS service function

Supplementary service function

WIN service function


Overall System Architecture of ZXC10 HLRe

latigid


Common Processor Module (CPM)

• The Common Processor Module (CPM) serves as the core module of the interface between the HLRe and other functional entities and the service processor. It has the following functions:

– Processes No.7 signaling and IP signaling.– Provide Memory Database.– Processes the HLRe MAP service.– Provide O&M module to process the operation

and maintenance instructions sent from the background and return the processing results to the background.


Common Processor Module (CPM)

1716151413121110987654321

BCTC

SMP

SMP

CLKG

CLKG

OMP

OMP

UIMC

UIMC

SMP

SMP

USI

USI

SIPI

SIPI

SPB

SPB

• Just like MSCe, HLRe CPM consists of one or multiple control subsystems (BCTC).


SPB

MNIC CLKSMP

SPBOMP

FE

FEFE

FE

OMCServer

BCTC

E1/ T1

FE

Interconnection of subsystems

Interfaces of CPM


HLRe Database Server Structure

• Each HDM consists of 2 servers and 1 disk array. It adopts the Cluster technology to enhance system reliability and saves data in the form of RAID1+0.

Server 1Server 1

Server 2Server 2

Disk arrayDisk array

SCSI Adapter SCSI Adapter

Ethernet Card 1

Ethernet Card 2

Ethernet Card 3

To HUB1

To HUB 2To HUB 2

To HUB1


HLRe Subscriber Database

• There are 2 subscriber databases in HLRe:

– Physical DatabaseLocation: HLRe Database Server

– Memory Database Location: Memory of SMP board


HDBAgent

• Function: – Realize the synchronization between Physical

Database in database server and Memory Database in SMP boards.


Application Server (DBIO)

• The DBIO program is run on the application server to provide the database access interface for the service console.


Service Console (Agent)

• The service console offers man-machine operations, through which carriers can manage subscribers data in physical database.

• A router can be used to implement the remote service handling.


HLRe Working Principle

Database Server

OMM server Application server

Maintenance console 1…n

Agent 1

Agent 2

HDBagent

Agent 3…n

DBIO

process

Physical

Database

CPM

SMP

Memory Daabase

Config.DB


Thanks ！Thanks Thanks ！！Questions are welcome Questions are welcome

Documents

04 System Structure of ZXC10 MGW%26MSCe%26HLRe_0702 (1)