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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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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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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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
One rack A 188 E1(T1) 4 pairs of STM-1 2 pairs of GE
Two racks Abis 2 pairs of GE 2 pairs of GE 2 pairs of GE
Two racks A 508 E1(T1) 8 pairs of STM-1 2 pairs of GE
IPoE1 Abis
DTB
Interface
One rack Abis 160 E1(T1) 160 E1(T1) 160 E1(T1)
One rack A 156 E1(T1) 4 pairs of STM-1 2 pairs of GE
Two racks Abis 480 E1(T1) 480 E1(T1) 480 E1(T1)
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Two racks A 508 E1(T1) 10 pairs of STM-1 2 pairs of GE
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:
Each DTB provides 32 E1 interface as Abis over E1.
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Each SDTB2 provides 2 STM-1 interface as Abis over STM-1.
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.
Boards configuration steps:
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.
Boards configuration steps:
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:
Each DTB provides 32 E1 interface as Abis over E1.
Each SDTB2 provides 2 STM-1 interface as Abis over STM-1.
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.
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