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

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System Structure of ZXC10 MGW/MSCe/HLRe

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.

BCTC/OMC

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

Capacity

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)

• 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

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

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

PCM PCM

MS1 PSTN

TrFO & RTO

EVRC VoiceEVRC Voice

EVRC Voice

MSCeMSCeMSCe

IP Network

MSCeMSCeMSCe

SIP-TSIPSIP--TT

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

IPISUP/TUP

Sigtran

ISUP/TUP

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

IP network

SS7 network

ISUP/TUP

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

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

MNIC CLKSMP

SPBOMP

OMCServer

E1/ T1

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

process

Physical

Database

Memory Daabase

Config.DB

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

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

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