ZXG10 iBSC Dimensioning Principle

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ZXG10 iBSC Dimensioning Principle


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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. I

Product Type Technical Description

Version Date Author Approved By Remarks

2013 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to bedisclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document issubjected to change without notice.


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II 2013ZTE CORPORATION. All rights reserved. ZTE Confidential Proprietary

TABLE OF CONTENTS

1 Introduction..................................................................................................... 12 iBSC Dimension Input .................................................................................... 22.1 Traffic Profile .................................................................................................... 22.2 Transmission Type ........................................................................................... 22.3 Default Parameters ........................................................................................... 33 iBSC Hardware Dimensioning ....................................................................... 33.1 iBSC Product Overview .................................................................................... 33.2 iBSC Hardware Dimension ............................................................................... 63.2.1 Processing Boards............................................................................................ 73.2.2 Interface Boards ............................................................................................... 83.2.3 Auxiliary Boards .............................................................................................. 103.3 RCBU Configuration Explanation (TC integrated) ........................................... 113.3.1 BIU Unit .......................................................................................................... 113.3.2 TC and AIU unit .............................................................................................. 133.3.3 GIU Unit .......................................................................................................... 143.4 NRCBU Configuration Explanation(TC Remote Located) ............................... 153.4.1 Ater interface .................................................................................................. 154 Summary ....................................................................................................... 16


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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. III

FIGURES

Figure 1-1 GERAN Dimensioning Process ........................................................................... 1Figure 3-1 ZXG10 iBSC System Architecture ....................................................................... 4Figure 3-2 ZXG10 iBSC Capacity Expansion ....................................................................... 5

TABLES

Table 2-1 Traffic Model ........................................................................................................ 2Table 2-2 Transmission Type ............................................................................................... 2Table 2-3 Default parameters ............................................................................................... 3Table 3-1 ZXG10 iBSC configuration capacity ..................................................................... 5Table 3-2 Description of Boards Function ............................................................................ 6Table 3-3 processing capacity of GUP2 ............................................................................... 8Table 3-4 the configuration principle of SPB2 ....................................................................... 8Table 3-5 ZXG10 iBSC Interface Boards Capacity ............................................................... 9Table 3-6 ZXG10 iBSC access capability of Abis/A interface ............................................... 9Table 3-7 ZXG10 iBSC auxiliary Boards Configuration Principle ........................................ 10


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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. 1

1 Introduction

The document describes the dimensioning guidelines for ZTE iBSC and iTC. It provides

methodology for ZTE iBSC and iTC, includes Abis/A /Gb/Ater interface dimensioning.

The dimensioning follows the process shown in the following figure.

Figure 1-1 GERAN Dimensioning Process

The GERAN Dimensioning needs the inputs of service profile, transmission type and

equipment capability. With these inputs, the equipment configuration of iBSC, iTC and

each interface board can be calculated based on the methodology introduced in this

document.

The 2nd

chapter introduces traffic service profile which is the dimensioning inputs. These

parameters could be divided into two parts, the first table is user plane related inputs, andsecond one is control plane related inputs.

The 3rd

chapter is equipment dimensioning, introducing how the iBSC configuration is

dimensioned and how the equipment is configured to meet the requirements of the

operator.

Dimensioning

Methodology

Service Profile

Transmission Type

Equipment Capability

CEquipment

Configuration


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2 2013ZTE CORPORATION. All rights reserved. ZTE Confidential Proprietary

The 4th

chapter is iTC equipment dimensioning, introducing how the iTC configuration is

dimensioned and how the equipment is configured to meet the requirements of the

operator.

2 iBSC Dimension Input

2.1 Traffic Profile

The GERAN Dimensioning is based on the Traffic Profile from the Operator. The

following is the minimum requirements for the iBSC dimensioning, and can be considered

as the input of the dimensioning.

Table 2-1 Traffic Model

Parameters provided by operators Value

CS call service (Erl)

TRX Number

PS throughput (Mbps)

PDTCH Number

Cell Number

iBSC Number

BTS Number

2.2 Transmission Type

According to the requirement of operator, the transmission interface type for iBSC is

listed in the table below:

Table 2-2 Transmission Type

Item Value

Abis Interface


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A Interface

Ater Interface

Gb Interface

2.3 Default Parameters

The parameters mentioned here always could be provided by operators,if we do not have

these materials, our default parameters can be set as below:

Table 2-3 Default parameters

Default Parameters Default Value

The average busy hour Traffic 0.025

A Interface GOS 0.001

Ratio of FR 100%

Ratio of HR 0%

Ratio of EDGE 50%

Ratio of GPRS 50%

Ratio of simultaneity usable Dynamic PDTCH 80%

Average Rate of GPRS 0.25kbps

Average Rate of EDGE 0.3kbps

3 iBSC Hardware Dimensioning

3.1 iBSC Product Overview

The iBSC system is built in a standard 19-inch cabinet, and the dimension of height*

width* depth is 2000* 600* 800 (mm). The system architecture of iBSC is shown as the

following figure:


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Figure 3-1 ZXG10 iBSC System Architecture

ZXG10 iBSC provides three types of shelves. With different functions, the shelves are

named as Control Shelf, Switch Shelf, and Resource Shelf.

Control Shelf: responsible for the control plane processing, O&M processing and clocking.

The Control Shelf includes OMP, CMP, CLKG, UIMC, SBCX, CHUB boards etc.

Resource Shelf: responsible for the user plane processing and interface accessing,

includes DTB, SPB2, SDTB2, GUP2, GUIM boards etc.

Switch Shelf: provides packet switch platform and supports several Resource Shelf

user-plane expansion. The Switch Shelf includes GLI, PSN and UIMC boards etc.

It is easy for shelf expansion according to the traffic increase, which is shown in the

following figure:


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Figure 3-2 ZXG10 iBSC Capacity Expansion

From figure3, there are three kinds of configuration of iBSC, one pair, two pairs and three

pairs of resource shelf, they can support different number of TRX. And with different

interfaces, each of them also has different capacity. The capacity of one rack and two

racks in full configuration is shown in the following figure:

Table 3-1 ZXG10 iBSC configuration capacity

A InterfaceE1(T1) A STM-1 A IP A

Abis Interface

E1(T1) AbisOne rack TRX 1024 1024 1024

Two racks TRX 3072 3072 3072

STM_1 AbisOne rack TRX 1024 1024 1024

Two racks TRX 3072 3072 3072

IP Abis

One rack TRX 1024 1536 2048

Two racks TRX 3072 3072 3072

IPoE1 Abis

(DTB Interface)

One rack TRX 1024 1024 1024

Two racks TRX 3072 3072 3072

IPoE1 Abis

(SDTB2 Interface)

One rack TRX \ 1024 1024

Two racks TRX \ 3072 3072

Resource

shelf

Resource

shelf

Switch

shelf

L

4

L

3

Control

shelf

L

2

Resource

shelf

L

1

Cabinet1

Resource

shelf

Resource

shelf

L

4

L

3

L

2

Resource

shelf

L

1

Cabinet2

Resource

shelf

Switch

shelf

L

4

L

3

Control

shelf

L

2

Resource

shelf

L

1

Cabinet1

Resource

shelf

L

4

L

3

L

2

Resource

shelf

L

1

Cabinet2

Switch

shelf

L

4

Resource

shelf

L

3

Control

shelf

L

2

Resource

shelf

L

1

Cabinet1


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3.2 iBSC Hardware Dimension

All the boards of iBSC are shown in the following table:

Table 3-2 Description of Boards Function

Board Full Name Function Backup Principle

UIMC

Universal

Interface

Module for

Control Plane

Switching of data and signaling

1+1

CMPControl Main

ProcessorCS/PS Service Control

1+1

CHUB Control HUB Switching of data and signaling 1+1

OMPOperation Main

Processor

O&M processor, Connects with

NetNumen-M31

1+1

SBCX

Single Board

Computer of

X86

Database for OMP

CLKG ClockGeneration

Clock generation and distribution 1+1

ICMIntegrated

Clock ModuleClock generation with GPS

1+1

GLIGigabit Line

Interfaceconnect with the BGSN shelf

Load sharing

PSNPacket Switch

NetworkPrimary switching function

Load sharing

SPB2SignalProcessing

Board

Signal Processing and 16 E1 for Gb,

14 for A,8 E1 for Abis

1+1 at Abis

interface

Load sharing at

other interface

GUIM

Giga bit User

Interface

Module

Complete the Ethernet switch and

TDM switch function between user

and control plane

1+1


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GUP2GSM Universal

Processing

TC, PCU, or RTP processing

N+1 for each

resource shelf at

Abis interface

Resource pool at A

and Gb interface

DTBDigital Trunk

Board32 E1/T1 digital trunk

SDTB2Sonet Digital

Trunk Board 2Provide 2 STM-1

1+1

GIPI GE IP InterfaceProvide 4 FE or 1 GE for IP access

in Abis, A & Gb

Load sharing at Gb

interface

1+1 at Abis and Ainterfaces

EIPIE1(T1) IP

Interface

Each EIPI supports 64 E1 TDM-IP

transitions

1+1

According to the function, there are three kinds of iBSC boards, including processing

boards, interface boards and auxiliary boards.

Processing boards are the most important part in iBSC, which is responsible for the

control plane processing and user plane processing. Interface boards are responsible for

the transmission interface and protocol processing. Auxiliary boards provide system

control, data switch, system operation and maintenance.

3.2.1 Processing Boards

There are three types of processing boards: CMP, GUP2, and SPB2.

CMP is Control Main Processor, responsible for the Control plane processing.

GUP2 is GSM Universal Processing board, used for user plane processing.

SPB2 is Signaling Processing Board, used for processing singling plane data.

They are dimensioned based on following factors:

1. TRX number

2. CS call service (Erl)


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3. Cell number

4. PDTCH number

5. PS throughput (Mbps)

Each CMP supports 1024 TRX&5000Erl&512Cell processing capacity and is deployed

with 1+1 backup;

GUP2 can be configured in A/Abis/Gb/Ater interface. For different interface and different

transmission type,

Different processing capacity of GUP2 is shown in the following table:

Table 3-3 processing capacity of GUP2

GUP2TDM

Abis

IP/IPoE1

Abis

TDM

A/AterIP A Gb

Processing

Ability392TRX 512TRX 1500TC

6090

channel

300cell,

6000*16Kchannel,

96Mbps

SPB2 can be configured at A/Ater/Abis interface to process singling plane data when the

transmission type of these interfaces is TDM mode. The following table shows the

configuration principle of SPB2.

Table 3-4 the configuration principle of SPB2

SPB2 TDM Abis TDM A/Ater

Configuration Ceiling(Number Cell/512,1)*2 2 pieces

3.2.2 Interface Boards

ZXG10 iBSC can provide abundant transmission interface to meet the operators

requirement, such as E1, STM-1, IPoE1, FE and GE, etc.

DTB is used to provide E1 interface.

SDTB2 is used to provide STM-1 interfaces.


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GIPI is used to provide FE/GE interfaces.

The limitation factor for transmission interface board is listed in the following table:

Table 3-5 ZXG10 iBSC Interface Boards Capacity

Interface Board Limitation Factor

DTB 32 E1

SDTB2 2 STM-1

GIPI 1 GE/4 FE

With different capacity of iBSC, interface board decides the access capability of interface.The table below shows the access capability of Abis/A interface.

Table 3-6 ZXG10 iBSC access capability of Abis/A interface

A InterfaceE1(T1) A STM-1 A IP A

Abis Interface

E1(T1) Abis

One rack Abis 208 E1(T1) 208 E1(T1) 208 E1(T1)

One rack A 188E1(T1) 4 pairs of STM-1 2 pairs of GE

Two racks Abis 624 E1(T1) 624 E1(T1) 624 E1(T1)

Two racks A 508E1(T1) 12 pairs of STM-1 2 pairs of GE

STM_1 Abis

One rack Abis4 pairs of

STM-14 pairs of STM-1

4 pairs of

STM-1

One rack A 188 E1(T1) 4 pairs of STM-1 2 pairs of GE

Two racks Abis12 pairs of

STM-112 pairs of STM-1

12 pairs of

STM-1

Two racks A 508 E1(T1) 10 pairs of STM-1 2 pairs of GE

IP Abis

One rack Abis 1 pair of GE 1 pair of GE 1 pair of GE


Two racks Abis 2 pairs of GE 2 pairs of GE 2 pairs of GE


IPoE1 Abis

DTB

Interface

One rack Abis 160 E1(T1) 160 E1(T1) 160 E1(T1)


Two racks Abis 480 E1(T1) 480 E1(T1) 480 E1(T1)


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IPoE1Abis

SDTB2

Interface

One rack Abis \ 4 pairs of STM-14 pairs of

STM-1

One rack A \ 4 pairs of STM-1 2 pairs of GE

Two racks Abis \ 12 pairs of STM-112 pairs of

STM-1

Two racks A \ 10 pairs of STM-1 2 pairs of GE

3.2.3 Auxiliary Boards

There are some boards used to provide the system control, data switch, system

operation, maintenance, and so on.

OMP is used to monitor and manage all of the boards in the system, and to implement

the general processing of the system and route protocol management.

SBCX provides the operation and maintenance management agent functionality.

CLKG board is responsible for the clock supply and external synchronization.

CHUB is for control plane data switching among different shelves.

UIMC is for the switching function of control plane processing boards, and clock

distribution. Information switching of UIMC boards in different shelves is implemented by

CHUB.

GUIM is for the switching function of user plane processing boards. Information switching

of GUIM boards in different shelves is implemented by GLI and PSN.

GLI and PSN are used for user plane data switching among different resource shelves.

Table 3-7 ZXG10 iBSC auxiliary Boards Configuration Principle

Board Name Dimension Principle

OMP 2 pieces per iBSC.

SBCX 1 or 2 pieces per iBSC

CLKG 2 pieces per iBSC


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CHUB 2 pieces per iBSC

UIMC 2 pieces per Control Shelf or Switch Shelf

GUIM 2 pieces per Resource Shelf

GIPI 2 pieces for OMCB

GLI 2 pieces for every 2 Resource Shelves

PSN 2 pieces per iBSC

3.3 RCBU Configuration Explanation (TC integrated)

AIU(A interface unit)

BIU(Abis interface unit)

GIU(Gb Interface Unit) are made up ofresource shelves; Two resource shelves are one basic configuration unit (Resource

Configuration Basal Unit - RCBU); in the future expansion, just RCBU is needed to be

added; two racks support 3 RCBU in full configuration;

There are some basic principles in RCBU configuration, the explanation is as the

following:

3.3.1 BIU Unit

BIU realizes the function of Abis interface access, supports TDM, IP over E1 and IP

access modes, and is composed of DTB/SDTB2/EIPI/GIPI, GUP2 and SPB2 boards.

1. TDM mode:

Each DTB provides 32 E1 interface as Abis over E1.

Each SDTB2 provides 2 STM-1 interface as Abis over STM-1.

SPB2 processes LAPD links in Abis interface, Each SPB2 processes 512 LAPD links,

and provides 8 E1 interface.

GUP2 transforms between TDM packets and IP packets. Each GUP2 supports 392 TRX,

and supports N+1 backup of each resource shelf.

2. IP over E1 mode:



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Each GUP2 supports 512 TRX.

Each EIPI supports 64 E1 TDM-IP transitions.

3. IP mode:

Interface board adopts GIPI as Abis over GE, Considered that one GIPI supports 2048

TRX.

Boards configuration steps:

1. Determine the kinds of interface boards according to the Abis bearing mode. The

number of E1 is NE1-Abis, the number of TRX is NTRX.

2. Determination of the number of SPB2(NSPB2)

NSPB2 = Ceiling(Ncell /512,1)*2;

Notes: Each SPB2 processes 512 LAPD when Abis adopts TDM transmission. The

minimum number of SPB2 in each RCBU is 2.

3. Determination of the number of DTB(NDTB);

NDTB = Ceiling (NE1-Abis /32,1);

4. Determination of the number of SDTB2(NSDTB2);

NSDTB2= Ceiling ((NE1-Abis)/126,1);

Notes: Each SDTB2 provides 2 STM-1.

5. Determination of the number of EIPI(NEIPI);

NEIPI= Ceiling(NDTB/2,1)*2;

Notes: Each EIPI supports 64 E1 TDM-IP transitions which accessed by 2 DTB boards.

6. Determination of the number of GIPI(NGIPI)


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NGIPI= Ceiling (NTRX /2048,1);

Notes: Each GIPI supports 2048TRX at Abis interface.

7. Determination of the number of NGUP2(NGUP2);

TDM: NGUP2= Ceiling (NTRX /392,1);

IPoE1/IP: NGUP2= Ceiling (NTRX /512,1);

Notes: GUP2 supports N+1 backup of each resource shelf at Abis interface.

3.3.2 TC and AIU unit

TC and AIU mainly includes TC resource, relay circuit resource and No.7 signaling

processing functions, which consist of DTB/SDTB2, SPB2 and GUP2 boards, supports

TDM and IP access.

DTB board provides 32 E1 interface, SPB2 board provides 14 E1 interface, and SDTB2

board provides 2 STM-1 interfaces. One pair of GIPI supports 7500Erl when IP access.


1. Determine the kinds of interface boards according to the A bearing mode. NE1-A is

the number of E1 at A interface; NA-TC, is the number of TC, calculated according to

traffic mode.

2. Determination of the number of SPB2(NSPB2): 2 pieces;

Notes: SPB2 at A interface is used for 7 signaling, configure one pair at A interface.

3. Determination of the number of DTB(NDTB);

NDTB = Ceiling (NE1-A /32,1);

NSDTB2 = Ceiling (NE1-A/63,1)*2;

NE1= NA-TC /31;


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Notes: Each SPB2 provides 14 E1, and each DTB provides 32 E1. If STM-1 is needed,

DTB can be replaced by SDTB2, and the capacity of one STM-1 is equal to the capacity

of 63 E1; SDTB2 board supports 1+1 backup.

4. Determination of the number of NGUP2(NGUP2);

TDM: NGUP2= NA-TC/1500;

IP: NGUP2= NA-TC/6090.

3.3.3 GIU Unit

Gb interface in GIU support E1 and GE circuit port, E1 bearing mode is realized in SPB2,

each of which supports 32Mbps data throughputs; GE bearing mode is realized in GIPI,

each of which supports 600Mbps data throughputs.


1. NPS, the data throughputs of Gb interface, is calculated according to traffic model;

Ncell is the number of cell; N16K is the number of 16K time slot.

2. Determination of the number of SPB2(NSPB2):

NSPB2 = Ceiling (NPS /32,1);

Notes: Each SPB2 provides 32M processing capacity, if Gb interface adopts E1 bearing

mode.

3. Determination of the number of GIPI(NGIPI):

NGIPI = Ceiling (NPS /600,1)*2;

Notes: Each GIPI provides 600M processing capacity, if Gb interface adopts GE bearing

mode.

4. Determination of the number of GUP2 (NGUP2):

NGUP2-1=Ceiling (Ncell/300,1);

NGUP2-2= Ceiling (N16K/6000,1));


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NGUP2-3= Ceiling (NPS/96,1);

NGUP2=Max (NGUP2-1, NGUP2-2, NGUP2-3)

Notes: Each GUP2 processes 96Mbps Gb interface throughputs, 300 cells, and 6000

16K time slots.

3.4 NRCBU Configuration Explanation(TC Remote

Located)

Ater interface, BIU(Abis interface unit), GIU(Gb Interface Unit) are made up of resource

shelves; Two resource shelves are one basic configuration unit (Near Resource

Configuration Basal Unit - NRCBU); in the future expansion, just NRCBU is needed to be

added; two racks support 3 NRCBU in full configuration;

There are some basic principles in NRCBU configuration and the configurations of BIU

and GIU is the same as RCBU, so now only explain Ater interface configuration principle

as the following:

3.4.1 Ater interface

Ater interface supports TDM access mode, and is composed of DTB/SDTB2, GUP2 and

SPB2 boards.

1. TDM mode:



SPB2 processes NO.7 links at Ater interface, and provides 14 E1 interface.

GUP2 transforms between TDM packets and IP packets. Each GUP2 supports 3360

voice channel with FR in Ater interface, 4200 voice channel with HR.


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4 Summary

This document is a dimensioning document. It defines the input for the dimensioning of

interface of iBSC, and defines the dimensioning methodology of iBSC.

In order to do the dimensioning for the of iBSC, the first steps is to analysis the traffic

profile, for some uncertain traffic parameter, assumption is necessary, to set reasonable

values for the dimensioning methodology, and then use the dimensioning methodology to

calculate the of iBSC configuration.

ZXG10 iBSC Dimensioning Principle

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