RNC Product Description_ZTE

ZXWR RNC Product Description



Version Date Author Approved By Remarks

V1.00 2008-03-18 Not open to the Third Party

V3.30 2008-08-15Zhu Xianghua

Update according to RNC V3.07.300

V3.60 2009-5-22Chen Feng

Update according to RNC U9.1

V3.70 2009-9-9 XuYi Update according to RNC U9.2

V3.71 2010-03-23 XuYiCancel POSI and modify environment indices

V3.80 2010-08-27 XuYi Update according to RNC U9.3

ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. I

© 2010 ZTE Corporation. All rights reserved.

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

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


TABLE OF CONTENTS

1 Overview....................................................................................................................1

2 Highlight Features.....................................................................................................22.1 Large Capacity and High Expandability......................................................................22.2 IP Architecture Design, High Efficiency.......................................................................22.3 High reliability.............................................................................................................22.4 Outstanding radio resource management...................................................................22.5 Abundant Interfaces and Flexible Networking.............................................................3

3 System Architecture.................................................................................................43.1 Product Physical Structure..........................................................................................43.2 Hardware Architecture................................................................................................53.2.1 RPU............................................................................................................................ 53.2.2 RAU............................................................................................................................ 53.2.3 RSU............................................................................................................................ 73.2.4 ROMU......................................................................................................................... 83.2.5 RPMU......................................................................................................................... 8

4 Reliability Design......................................................................................................94.1 Hardware Redundancy Design...................................................................................94.2 Software Reliability Design.........................................................................................9

5 Technical Specifications.........................................................................................105.1 Technical Indices......................................................................................................105.2 Interface Indices........................................................................................................105.3 Clock Indices............................................................................................................115.4 Reliability Indices......................................................................................................115.5 Electromagnetic Compatibility Indices......................................................................125.6 Weight and Dimensions............................................................................................125.7 Power Supply............................................................................................................125.8 Environment..............................................................................................................125.9 Security Indices.........................................................................................................13

6 Installation...............................................................................................................15

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FIGURES

Figure 1 RNC in WCDMA system...............................................................................................1Figure 2 ZXWR RNC Figuration..................................................................................................4Figure 3 ZXWR RNC Rack Architecture.....................................................................................5Figure 4 RNC Logical Units.........................................................................................................5Figure 5 Hardware Installation Flow..........................................................................................15

TABLES

Table 1 RNC technical indices.................................................................................................10Table 2 RNC technical indices.................................................................................................10Table 3 RNC clock indices.......................................................................................................11Table 4 RNC Reliability............................................................................................................11Table 5 Anti-Interference of Electromagnetic EMC Indices......................................................12Table 6 Weight and Dimensions..............................................................................................12Table 7 power supply...............................................................................................................12Table 8 RNC Environment Indices...........................................................................................12Table 9 The General Terminologies and Definitions................................................................17

ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. III


1 OverviewIn general, WCDMA system is consisting of Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN) and User Equipment (UE). UTRAN has two network elements: Node B and RNC. Iub is defined as the interface between RNC and Node B. Fig 1 shows the position of RNC in WCDMA system.

Figure 1 RNC in WCDMA system

RNC connects other equipments via the following interfaces:

Iub interface to Node B

Iu-CS interface to MSC/MSC Server

Iu-PS interface to SGSN

Iur interface to other RNC

The main functionalities of RNC include:

System information broadcast and UE access control

Mobility management, such as handover etc.

Radio Resource Management such as power control, cell resource allocation etc.

Access bearer service of CS domain and PS domain

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Encryption and decryption for signaling and data

ZTE RNC product, named ZXWR RNC (hereinafter refer to “RNC”), is based on 3GPP FDD R8, being compatible with other network elements and UE based on R99/R4/R5/R6/R7/R8. At the same time, ZXWR RNC provides series standard interfaces including Iu, Iub, Iur etc, supporting to connect with other venders’ equipments such as CN, RNC etc.

2 Highlight FeaturesThe ZXWR products always aim at saving customer’s investment in 3G products by offering a large capacity and linear expandable system once and for all. This facilitates high density 3G services. The RNC adopts distributing design, separates control plane from user plane, interface from application, supports ATM protocol stack, it also supports all IP UTRAN. The RNC system has the following features:

2.1 Large Capacity and High Expandability

The RNC is designed to adapt service increment and various traffic environments. It provides a large capacity and is easy to be expanded. The data throughput is up to 9.6 Gbps and maximum traffic is 76800Erl. The control plane and the user plane of the RNC are in distributed mode so there is no bottleneck for centralized processing in the entire system. The processing resources of control plane and user plane are linear expandable according to the capacity increment requirement.

2.2 IP Architecture Design, High Efficiency

Base on the all IP switching platform, data transmission is high efficient and flexible. The high performance packet data management platform ensures the system non-blocking data transaction capability. Comparing with ATM-based platform, it features convenient maintenance and configuration, flexible expandability, higher transmission efficiency, and agile transmission mechanism, which can meets the future requirements of increasing mobile data services.

2.3 High reliability

The RNC has high reliability and stability. The system is based on redundancy design. So there is no single point of failure. The system supports online software download and there is no need to reboot after version upgrade.

2.4 Outstanding radio resource management

ZTE owns dozens of patents on radio resource management of the RNC. It supports automatic optimization of radio parameters and can intelligently allocate and schedule radio resource priorities according to network load situation and QoS level.

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2.5 Abundant Interfaces and Flexible Networking

RNC supports ATM/IP dual protocol stack, it supports all kind of physical interfaces such as E1/T1, STM-1, channelized STM-1, FE and GE etc. At different phases, RNC can flexibly network according to different conditions, and has realized IP UTRAN.



3 System Architecture

3.1 Product Physical Structure

The RNC system is built in a standard 19-inch cabinet, and the dimension of height* width* depth is 2000* 600* 800 (mm). The rack of RNC system and architecture are shown as the following figures.



Figure 2 ZXWR RNC Figuration

Figure 3 ZXWR RNC Rack Architecture

3.2 Hardware Architecture

RNC hardware logical units are shown as:



Figure 4 RNC Logical Units

3.2.1 RPU

The RPU (RNC Processing Unit) processes control plane signaling and user plane information, including RCB (RNC control board) and RUB (RNC user board) boards.

3.2.1.1 RCB

RCB accomplishes the control protocol processing of RNC, such as RANAP, NBAP, RNSAP, RRC, SABP etc.

3.2.1.2 RUB

RUB (RNC User Plane Processing Board) is a user plane processing board of RNC, dealing with the user plane protocols. RUB deals with the radio user plane protocols, including CS service FP/MAC/RLC/IuUP/RTP/RTCP protocol stack and PS service FP/MAC/RLC/PDCP/IuUP, GTP-U protocols.

3.2.2 RAU

RAU (RNC Access Unit) provides the interface access function for Iu, Iub and Iur of RNC. RAU is configured with the following boards:

DTA: Digital Trunk board with ATM

DTI: Digital Trunk board with IP

SDTA2: Sonet Digital Trunk board with ATM, 2nd Generation

SDTI: Sonet Digital Trunk board with ATM

APBE: ATM Process Board Enhanced

POSI: POS Interface board

GIPI4: Gigabit IP Interface board, 4th Generation

3.2.2.1 DTA

DTA is used to provide ATM over E1/T1 interfaces

DTA provides 32*E1/T1 electrical interfaces and supports 30 IMA groups.

3.2.2.2 DTI

DTI is used to provide IP over E1/T1 interfaces

DTI supports 32*E1/T1 electrical interfaces, and supports 32 MLPPP groups.



3.2.2.3 SDTA2

SDTA2 is used to provide channelized STM-1 interfaces and IMA protocol processing.

SDTA2 provides 4 channelized STM-1 optical interfaces, and supports 168 IMA groups.

3.2.2.4 SDTI

SDTI is used to provide channelized STM-1 interfaces and MLPPP protocol processing.

SDTI provides 2 channelized STM-1 optical interfaces, and supports 64 MLPPP groups.

3.2.2.5 APBE

APBE is for the processing of ATM access over STM-1, and implements SAR functionality of AAL2 and AAL5.

APBE provides 4 STM-1 optical interfaces.

3.2.2.6 POSI

POSI is for the processing of IP access over STM-1.

POSI provides 4 STM-1 optical interfaces.

3.2.2.7 GIPI4

GIPI4 provides FE/GE interfaces.

GIPI4 provides 2*GE optical interface/ electrical interfaces, or 4* FE electrical interfaces.

3.2.3 RSU

The RSU (RNC Switch Unit) provides a large-capacity and non-blocking IP switching unit for system control management, communication between service processing boards and traffic connection among multiple RAUs.

It is constructed with:

PSN: Packet Switch Network

GLI: Gigabit Line Interface

UIMC: Universal Interface Module of Control

GUIM: GE Universal Interface Module

THUB: Trunk HUB



3.2.3.1 PSN

PSN is the system switching board of RNC. It accomplishes kernel switching function of RSU, implements the packet data switching of each GLI.

PSN supports up to 40Gbps switching capability.

3.2.3.2 GLI

GLI is the access switching board, which implements RPU/RAU access to RSU, including the physical layer adaptation, IP package checklist, segment, forwarding and traffic management etc, and it converges the data from RPU/RAU to PSN for switching.

3.2.3.3 UIMC

UIMC is a type of switching board of RNC, belonging to RSU. It accomplished switching function among control plane processing boards, and clock distribution. Information switching of UIMC boards in different shelves is implemented by THUB.

3.2.3.4 GUIM

GUIM is for the switching functionality of user plane processing boards. Information switching of GUIM boards in different shelves is implemented by GLI and PSN.

3.2.3.5 THUB

THUB is for control plane data switching among different shelves. It supports 400Mbps switching capability.

3.2.4 ROMU

The ROMU (RNC Operation and maintenance unit) is responsible for the general processing and implementing O&M control (including O&M agent) of the entire system as well as system clock supply and external synchronization.

It includes:

ROMB: RNC Operating & Maintenance Board

CLKG: Clock Generator

SBCX: X86 Single Board Computer

3.2.4.1 ROMB

ROMB as RNC O&M agent 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.



3.2.4.2 CLKG

CLKG board is responsible for the clock supply and external synchronization. CLKG board gets clock reference from BITS, GPS receiver or the circuit. After synchronization, the signal is used at every interface shelf.

The default configuration of CLKG doesn’t include GPS module. GPS module should be added in CLKG if GPS clock or GPS location service is required.

3.2.4.3 SBCX

SBCX provides the operation and maintenance management agent functionality.

3.2.5 RPMU

RPMU (RNC Peripheral Monitor Unit) belongs to ROMU. It provides monitoring function to peripheral equipments, and collects information of all boards, alarms while the system has faults. It includes:

PWRD: Power Distributor

ALB: Alarm Box

3.2.5.1 PWRD

PWRD is not only responsible for -48V power provision for all shelves and fans in the rack, but also for the collecting peripheral and circumstance information, including the PWRD and fan’s status, temperature, smoke, water and infrared alarming.

PWRD reports the detected information to ROMB via RS485 interface.

3.2.5.2 ALB

Alarm box will obtain the alarm information from OMM, and send the different level alarms according to different fault situations of the system in order to be managed and intervened in time by the equipment management personnel.

ALB provides several alarm methods including SMS, LCD display, file transfer, voice alarm etc.

4 Reliability Design

4.1 Hardware Redundancy Design

In order to ensure reliability, RNC rack and shelves adopt dual-power-supply, and the connection cables in RNC rack are at least dual-mode. At the same time, RNC provides 1+1 backup for the key boards such as: ROMB, CLKG, RCB, UIMC, GUIM, THUB, PSN,



GLI, and RUB adopts load-sharing method, which is named redundancy resource pool. And each of the interface boards adopt 1+1 backup or load-sharing. The entire system performance will not be affected if individual board has fault.

4.2 Software Reliability Design

RNC software subsystem adopts high reliability design. Besides the external operation and maintenance ports, which are protected by internal firewall software, RNC internal communication in whole system is entirely isolated. So RNC can detect and defend against the network security attacks. At the same time, the OMM subsystem supports powerful user authentication functionality; the idea is that system will distribute relevant operation permission according to user name and password.

RNC software system has powerful self-fault-tolerant capability, mainly reflected in:

Automatically checking the legitimacy of data configured by user, refusing wrong or unreasonable data configuration and informing user to modify

Supporting key version and data backup, and performing rollback when version or data loading failed

Supporting “watch dog” functionality, resetting the boards when software going wrong and recording the failure information by black box function

Detecting the failure of ports, link and SW/HW, resetting/triggering backup unit to guarantee system running normally

5 Technical Specifications

5.1 Technical Indices

Table 1 RNC technical indices

Item Indices

Processing capability 76800 Erl

Data throughput ( Two-way data flow )

9.6Gbps

Maximum Quantity of Nodes B 1960

Maximum Quantity of cells 5880

BHCA 7000K



5.2 Interface Indices

Table 2 RNC technical indices

Transmission type

StandardInterface board

Port Interface

Remark

E1/T1ITU-T G.703/G.704

DTA DB68Provide 32* E1/T1 for Iub ATM transmission

DTI DB68Provide 32* E1/T1 for Iub IP transmission

Channelized STM-1/OC-3

ITU-T G.957ITU-T I.432.1ITU-T I.432.2

SDTA2 LC/PCProvide 4* channelized STM-1/OC-3 optical interfaces for Iub ATM transmission

SDTI LC/PCProvide 2* channelized STM-1/OC-3 optical interfaces for Iub IP transmission

STM-1/OC-3c

ITU-T G.957ITU-T I.432.1ITU-T I.432.2

APBE LC/PCProvide 4* STM-1/OC-3 optical interfaces for Iub/Iu/Iur ATM transmission

POSI LC/PCProvide 4* STM-1/OC-3 optical interfaces for Iub/Iu/Iur IP transmission

FE IEEE 802.3

GIPI4 configured with FE electrical interface

RJ45Provide 4* FE for Iub/Iu/Iur IP transmission

GE IEEE 802.3

GIPI4 configured with GE electrical interface

RJ45Provide 2* GE electrical interface for Iub/Iu/Iur IP transmission

GIPI4 configured with GE optical interface

LC/PCProvide 2* GE optical interface for Iub/Iu/Iur IP transmission

5.3 Clock Indices

Table 3 RNC clock indices

Item Indices

Synchronization level Level 2 class A

Clock working mode: Fast capture, tracking, holdover and free-run

Clock synchronous link interface

1) Incoming signal jitter and wander: 1.5UI (0.02 kHz–2.4 kHz)2) Outgoing signal jitter and wander: 1.5UI (0.02 kHz–10 kHz)0.2 UI (18 kHz–100 kHz)



Each clock board supports 7 clock resource, including: 4 clock in equipment room (2MHZ or 2Mbit), 2 line clock (8KHZ, acquired from Iu interface) and 1 * GPS clock. One of the 7 clock resource will be specified as the working clock source via software configuration, the rest clocks for standby.

When all the 7 clock sources are missing, clock board can work under free oscillation, which is used by RNC.

No matter it is acquired from clock source or under free oscillation, RNC can provide its own clock to NodeB.

5.4 Reliability Indices

In ZXWR RNC, the algorithm of system reliability is based on the GJB/Z299B Electronic Equipment Reliability Estimation Manual and MIL-HDBK-217F Electronic Equipment Reliability Estimation

Table 4 RNC Reliability

Item Indices

MTBF ≥240000 hours

MTTR 0.5 hour

Availability 99.999792%

Downtime ≤1.09 minutes/year

5.5 Electromagnetic Compatibility Indices

Table 5 Anti-Interference of Electromagnetic EMC Indices

Item Standard

Static Discharge ImmunityContact Discharge: ±6000VAir Discharge: ±8000V

Surge Impact Immunity DC Power port Line(Ground): ±2000V

5.6 Weight and Dimensions

Table 6 Weight and Dimensions

Item Standard

Requirements of Equipment Site 350kg/m2

Dimensions2000 mm x 600 mm x 800 mm (Height x Width x Depth)



5.7 Power Supply

Table 7 power supply

Item Standard

Power input -48V DC

Allowable fluctuation range -57 VDC to –40 VDC

Maximum Power Consumption per rack

3700W

5.8 Environment

Table 8 RNC Environment Indices

Item Indices

Equipment environment

Temperature Long-term operation: 0°C ~ +45°CShort-term operation: -5°C ~ +50°C

HumidityLong-term operation: 5%~85%Short-term operation: 5%~90%

Noise

When the system is in the full power output and the working temperature is 43°C ± 2°C, the noise power level is less than 6.5 Bels (aprox. 65dB).

Requirements of Equipment Site

350kg/m2

Atmospheric pressure

70 kPa–106 kPa

Storage environment

It should be packed and stored indoors.Temperature: -45°C~+70°C.Relative humidity: 10%~90%; free of condensation.

Transport Environment

Transport environment:2K4P/2B2/2C3/2S3/2M3Sustainable transport time: 30 daysIntact package

Mechanical Adaptability

ETSI 300019-1-4 ClassM4.1

5.9 Security Indices

Optical Interface Protection

The optical interface design and optical module chosen are according to the requirements of BS EN 60825-2-2000.

Rack’s Stability



The layout of the rack shall maintain the overall symmetry. Under the premise to ensure the performance indices and thermal design requirements, the gravity center shall be lowered as much as possible to improve the overall stability. In normal conditions, the equipment shall not be inverted on a 10 degrees tilt platform. The shell of the equipment must be able to resist some external percussion. The case, shelves, and shell must be fixed reliably, without the tendency to scatter.

Rack Protection Grade

Security protection grade is IP20 (‘2’indicates that prevents the object which is bigger than 12mm such as finger to insert into. And ‘0’ indicates that has no special water protection)

Steel Ball Test

Such test can be done by using the integrity rack shell of sample or the other biggest area of not enhanced part: one 500g steel ball will free fall from 1.3m height to hit the up surface of the equipment, the case has no clearly indent. Or the 500g steel ball with 1.3m line as a horizontal pendulum to hit the beside surface of the equipment, if there is indent damage or scratch, but it does not affect security, water resistant, and it also can endure corresponding anti- electric strength, this test is passed.

Lightning Protection

The system provides lightning protection measures. The working ground and the protection ground are reliable with the grounding resistance of the protection ground less than 1 ohm. The protection grounding terminals are anti-corrosive; the insulating layer of the grounding conductor is yellow-green. There is tooth-shape washer for the connection between the protection ground and the screw of shell (or PCB) to make the protection group more reliable and stable.

Current leakage

Current leakage of the overall system: <3.5 mA.

Security Marks

A clearly and long term sticky tags or marks must be labeled to ensure no mistake of wrong board and cable connection. It has indicator, switch and button and mark with clear color to indicate the meaning of the system running status.

Heat Resistance and Flame Proof

The case can resist heat and flame. The outside case and clapboard between shelves are all made of flame proof, heat resistance and explosion prevention material. All material and units has the flame proof level better than V-2 or HF-2.

Input Current

Under the condition of rated input voltage, the input current shouldn’t be more than110% of rated current.

Abnormal Situations



RNC has no danger at the situations of overload, output short circuit, power in reverse, fan locked and other man-made faults caused by mistake operations.

The Isolation of Communication Network to Ground

The components bridged at the normal position will not be damaged if the 1000Vac grounding insulation between the telecom network circuits and grounding components is not punctured.

The Stable Anti-electric Strength of Network Voltage Protection

As for TNV-1 circuit, whether it can be connected or not, it meets the requirements of the stable anti-electric strength of network voltage protection.

Components Related with Security

Components related with security in RNC have related certifications.

Anti-earthquake performance

RNC equipment has the anti-earthquake performance of 7th scale.

6 InstallationFigure 5 shows the installation flow of ZXWR RNC hardware.



Figure 5 Hardware Installation Flow

The workload of the hardware installation is large and complex. It can fall into the following parts:

1 Installing cabinet

ZXWR RNC adopts 19-inch standard cabinet. The cabinet installation includes base installation mode and feet installation mode. In the case of multi-cabinet, fix a single cabinet first and then connect the cabinets.

2 Installing boards

Usually, the shelf is installed inside the rack before delivery. The users are only required to install boards and other accessories on the site.

3 Installing cables



After installing the cabinet, cables are required to install, including cabinet power cable, cabinet grounding cable, intra-cabinet line, out-of-cabinet line, and inter-cabinet line.

4 Installing GPS antenna feeder system

GPS serves as the clock and frequency reference of WCDMA, playing a very important role. In addition, it provides the system with GPS ephemeris signals for AGPS location. GPS antenna receives the navigation location signals from the GPS satellite, modulating into the frequency, clock signals and AGPS messages via the GPS signal receiver. The clock signals are provided to WCDMA units and AGPS messages are sent to the processing unit.

5 Installing accessories

After installing the cabinet, accessories related to RNC operation are required to install, including the alarm box and all kinds of sensors.

6 Checking the installation

Check the installation of ZXWR RNC hardware completely after it ends. The check includes the cabinet installation techniques, cable connection and layout, auxiliary device and related items.

7 Powering on/off the equipment

After checking the installation, please power on/off the equipment for check.



Acronyms and Abbreviations

The general terminologies and definitions of this product are listed in the following table.

Table 9 The General Terminologies and Definitions

Item Explanation

IuInterconnection point between an RNC and a Core Network. It is also considered as a reference point.

Iub Interface between an RNC and a Node B.

IurA logical interface between two RNC. Whilst logically representing a point to point link between RNC, the physical realization may not be a point to point link.

Uu The Radio interface between UTRAN and the User Equipment.

Node BA logical node responsible for radio transmission / reception in one or more cells to/from the User Equipment. Terminates the Iub interface towards the RNC.


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