2.7.1.1 SRAN5_0 BSC6900 Product Description

SRAN5.0 BSC6900 Product Description

Issue V1.0

Date 2010-01-30

HUAWEI TECHNOLOGIES CO., LTD.


Issue V1.0 (2010-01-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

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Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions

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The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

http://www.huawei.com

mailto:[email protected]




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Contents

1 Introduction .............................................................................................................................. 5 1.1 Positioning ................................................................................................................................................. 5 1.2 Benefits ..................................................................................................................................................... 7

2 Architecture ............................................................................................................................ 11 2.1 Overview ................................................................................................................................................. 11 2.2 Hardware Architecture ............................................................................................................................. 12 2.3 Software Architecture ............................................................................................................................... 19 2.4 Reliability ................................................................................................................................................ 20

3 Configurations ....................................................................................................................... 25 3.1 Overview ................................................................................................................................................. 25 3.2 Hardware Configuration Specifications in BM/TC Combined Mode ......................................................... 26 3.3 Hardware Configuration Specifications in BM/TC Separated Mode .......................................................... 27 3.4 Hardware Configuration Specifications in A over IP Mode ........................................................................ 29

4 Operation and Maintenance ................................................................................................. 31 4.1 Overview ................................................................................................................................................. 31 4.2 Benefits ................................................................................................................................................... 32

5 Technical Specification ......................................................................................................... 35 5.1 Technical Specifications ........................................................................................................................... 35 5.2 Compliance Standards .............................................................................................................................. 39

6 Acronyms and Abbreviations .............................................................................................. 43




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1 Introduction

1.1 Positioning This product description is applicable to the BSC6900 V900R012.

With the rapid development of mobile communications technologies, multiple network systems come into coexistence. In this situation, the network operators worldwide have to deploy different networks and thus pay high Capital Expenditure (CAPEX) and operation expenditure (OPEX). Therefore, the industry has been focusing on the convergence of multiple network systems to reduce the expenditures of the operators.

The BSC6900 is an important Network Element (NE) of Huawei SingleRAN solution. It adopts the industry-leading multiple Radio Access Technologies (RATs), IP transmission mode, and modular design. In addition, it is integrated with the functions of the UMTS RNC and GSM BSC, thus efficiently maintaining the trend of multi-RAT convergence in the mobile network.

The BSC6900 can be flexibly configured as a BSC6900 GSM, BSC6900 UMTS, or BSC6900 GU as required in different networks. The BSC6900 in independent mode refers to the BSC6900 GSM or the BSC6900 UMTS whereas the BSC6900 in integrated mode refers to the BSC6900 GU.

The BSC6900 GU operates as an integrated NE to access the GSM&UMTS network and integrates the functions of the GSM BSC and the UMTS RNC. When the BSC6900 GU accesses the GSM network, the 3GPP R6 applies; when the BSC6900 GU accesses the UMTS network, the 3GPP R7 applies.

This document describes the BSC6900 in integrated mode, that is, the BSC6900 GU.

Figure 1-1 shows the BSC6900 GU.




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Figure 1-1 BSC6900 GU

The BSC6900 GU connects to the core networks and manages the base stations in the GSM and UMTS networks. Figure 1-2 shows the position of the BSC6900 GU in the network.

Figure 1-2 Position of the BSC6900 GU in the network

Abis

CBC

UE

BSC6900 GU

NodeB

Dual-mode BTS

Iub

CS core network

Iub /Abis

A/Iu-CS

Gb/Iu-PS

Cb/Iu-BCBTSUu/Um

BSC

PS core network

The interfaces between the BSC6900 GU and each NE in the UMTS network are as follows:

l Iub: the interface between the BSC6900 GU and the NodeB l Iur: the interface between the BSC6900 GU and the RNC l Iu-CS: the interface between the BSC6900 GU and the Mobile Switching Center (MSC)

or Media Gateway (MGW)




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l Iu-PS: the interface between the BSC6900 GU and the Serving GPRS Support Node (SGSN)

l Iu-BC: the interface between the BSC6900 GU and the Cell Broadcast Center (CBC)

These interfaces are standard interfaces, through which equipment from different vendors can be interconnected.

The interfaces between the BSC6900 GU and each NE in the GSM network are as follows:

l Abis: the interface between the BSC6900 GU and the BTS l A: the interface between the BSC6900 GU and the Mobile Switching Center (MSC) or

Media Gateway (MGW) l Gb: the interface between the BSC6900 GU and the Serving GPRS Support Node

(SGSN)

The A and Gb interfaces are standard interfaces, through which the equipment from different vendors can be interconnected.

The BSC6900 GU performs functions such as radio resource management, base station management, power control, and handover control.

1.2 Benefits

Flexible Topologies, Smooth Evolution, and Outstanding Capability in Multi-RAT Convergence

l The BSC6900 can be flexibly configured as a BSC6900 GSM, BSC6900 UMTS, or BSC6900 GU; therefore, it is applicable to various networking scenarios.

l The BSC6900 can be configured as one of the three variants, thus facilitating the smooth evolution from GSM to GSM&UMTS, and the evolution between GSM&UMTS and UMTS.

l The functions of the BSC6900 boards can be set online to dynamically adjust the capacity allocation between the GSM network and the UMTS network.

The BSC6900 is compatible with the hardware of the BSC6810 and BSC6000. Through software loading, the BSC6810 and BSC6000 in the existing network can be upgraded to the BSC6900.

High Integration and Capacity l The BSC6900 adopts the switching system based on IP and TDM. It provides a

maximum capacity of 60 Gbits/s data switching on the IP plane and 128 kbit/s x 128 kbit/s data switching on the TDM plane.

l The BSC6900 board uses the multi-core processor, which greatly improves the processing capability.

l The BSC6900 supports the device resource pool in the entire system. It provides a maximum capacity of 24,000 Erl for CS services and 16,384 active PDCHs for PS services. In addition, the throughput on the Gb interface reaches 1,536 Mbit/s.




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Improved Utilization of Transmission Bandwidth Through Sharing of Transmission Resources

l The BSC6900 provides the highly efficient transmission resource management algorithm, which enables the transmission bandwidth to be shared between the GSM network and the UMTS network. In this way, the utilization of transmission bandwidth increases by 5% to 10%.

l The IP interface board of the BSC6900 is shared between the GSM network and UMTS network so that it can transmit the GSM data and the UMTS data at the same time.

l The BSC6900 supports the following flexible transmission modes shared between the GSM network and the UMTS network: − Abis/Iub over IP − 2G/3G co-transmission based on TDM timeslot switching − A/Iu-CS over IP − Gb/Iu-PS over IP

Compatible Hardware in Different Networks The BSC6900 shares a hardware platform with the BSC6000 and BSC6810, and all the BSC6000 and BSC6810 boards can be used by the BSC6900.

l The BSC6900 shares all the hardware and software of the Radio Resource Management (RRM) module, OM module, and clock synchronization module with the BSC6000 and BSC6810.

l The BSC6900 shares the hardware of most of the service processing modules, signaling processing modules, and interface processing modules with the BSC6000 and BSC6810. In addition, the working mode of the boards can be set online.

The BSC6900 maximizes the sharing of the spare parts between the GSM network and the UMTS network, thus simplifying the management of the spare parts and protecting the equipment investment.

Reduced OPEX Through Shared OM System The BSC6900 integrates the two separate OM systems of the traditional GSM network and UMTS network into a uniform OM system, thus improving the user experience and the efficiency in maintaining the multi-RAT system.

The BSC6900 uses the web-based Local Maintenance Terminal (LMT) without the need to install the client software. You can directly use the LMT after logging in to the BSC6900 homepage. The use of LMT facilitates the equipment commissioning and software upgrade and reduces the OM cost.

Expanded Network Capacity Through Optimized Co-RRM Algorithm The Co-Radio Resource Management (Co-RRM) algorithm performs unified management and intelligent scheduling on the radio resources in the GSM network and UMTS network.

The traditional Co-RRM algorithm exchanges the 2G/3G load information between the GSM network and the UMTS network through signaling procedures across the core networks. The




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Co-RRM algorithm optimized by Huawei enables rapid transmission of 2G/3G load information (used as internal messages) within the BSC6900. The advantages are as follows:

l Having no dependency on the equipment in the core network l Reducing delay, adjusting the load in real time, and increasing the success rate of

inter-RAT handovers l Decreasing the signaling flow on the standard interface and saving interface resources

The optimized Co-RRM algorithm maximizes the sharing of radio resources between the GSM network and the UMTS network, thus increasing the network capacity.

Improved Resource Usage Through GSM/LTE Interoperaability In scenarios with seamless coverage between GSM and Long Term Evolution (LTE), the radio resources are shared, thus improving resource usage. The clock can be shared between the BSC6900 GU and LTE, thus reducing configuration redundancy and resource redundancy. The BSC6900 GU supports the evolution from GSM to LTE.




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2 Architecture

2.1 Overview The BSC6900 GU has a modular design. It enhances resource utilization and system reliability by fully interconnecting subracks and applying distributed resource pools to manage the service processing units. The backplane is universal and every slot is common to different types of boards so that different functions can be performed. In this way, the universality and evolution capability of the hardware platform are improved.

The BSC6900 GU integrates the functions of the BSC6900 GSM and the BSC6900 UMTS through unified software management, shared OMU and GCU/GCG, and configuration of GSM service boards and UMTS service boards in separate subracks. The MPS can be a GSM subrack or a UMTS subrack, and works as an NE.

Figure 2-1 Configuration of the BSC6900 GU (example)

MPR

EPS(UMTS)

EPS(UMTS)

MPS(UMTS)

EPR

EPS(GSM)

EPS(GSM)

EPS(UMTS)




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2.2 Hardware Architecture 2.2.1 Cabinets

The BSC6900 GU uses the standard N68E-22 cabinet and N68E-21-N cabinet. The design complies with the IEC60297 and IEEE standards.

In terms of the subrack configuration, the BSC6900 GU cabinet is classified into the Main Processing Rack (MPR), Extended Processing Rack (EPR), and TransCoder Rack (TCR), as described in Table 2-1. If the number of subracks configured in the cabinet is less than three, the subracks should be configured from the bottom up.

Table 2-1 Classification of BSC6900 GU cabinets

Cabinet Contained Subrack Configuration Principle

MPR 1 MPS, 0–2 EPSs Only one MPR is configured.

EPR 1–3 EPSs As required by the actual service capacity, 0–1 EPR is configured.

TCR 1–3 TCSs In BM/TC separated mode, 0–2 TCRs are configured.




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Figure 2-2 BSC6900 GU cabinet

2.2.2 Subracks In compliance with the IEC60297 standard, the BSC6900 GU subrack has a standard width of 19 inches. The height of each subrack is 12 U. The boards are installed on the front and rear sides of the backplane, which is positioned in the center of the subrack.

One subrack provides 28 slots. The slots on the front of the subrack are numbered from 0 to 13, and those on the rear are numbered from 14 to 27.

Figure 2-3 shows the front view and rear view of the subrack.




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Figure 2-3 Front view (left) and rear view (right) of the subrack

The BSC6900 GU subracks are classified into main processing subrack (MPS), extended processing subrack (EPS), and transcoder subrack (TCS), as described in Table 2-2.

Table 2-2 Classification of BSC6900 GU subracks

Subrack Quantity Function

MPS 1 The MPS performs centralized switching and provides service paths for other subracks. It also provides the service processing interface, OM interface, and system clock interface.

EPS 0-5 The EPS performs the functions of user plane processing and signaling control.

TCS 0-4 The TCS is configured only in BM/TC separated mode.

The TCS processes CS services and performs the functions of voice adaptation and code conversion.

2.2.3 Boards Table 2-3 lists the hardware version and its corresponding boards.

Table 2-3 Hardware version and its corresponding boards

Hardware Version

Corresponding Boards

HW60 R8 DPUc, DPUd, XPUa, SCUa, TNUa, GCUa, OMUb, EIUa, FG2a, GOUa, OIUa, PEUa




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HW68 R11 DPUb, SPUa, SCUa, GCGa, GCUa, OMUa, AEUa, AOUa, FG2a, GOUa, PEUa, POUa, UOIa

HW69 R11 DPUc, DPUd, DPUe, SPUb, XPUb, SCUa, TNUa, GCGa, GCUa, OMUa, AEUa, AOUc, EIUa, FG2c, GOUc, OIUa, PEUa, POUc, UOIa, UOIc

The BSC6900 V900R012 is based on the hardware version HW69 R11.

The BSC6900 GU boards can be classified into the OM board, switching processing board, clock processing board, signaling processing board, service processing board, and interface processing board, as described in Table 2-4.

Table 2-4 Classification of BSC6900 GU boards

Board Type

Board Name

Function Application Variant

OM board OMUa l Performs configuration management, performance management, fault management, security management, and loading management for the BSC6900.

l Works as the OM bridge of the LMT/M2000 to provide the BSC6900 OM interface for the LMT/M2000 and to enable the communication between the BSC6900 and the LMT/M2000.

l Works as the interface to provide the web-based online help.

The OMUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

Switching processing board

SCUa l Provides MAC/GE switching and enables the convergence of ATM and IP networks.

l Provides data switching channels. l Provides system-level or subrack-level

configuration and maintenance. l Distributes clock signals for the

BSC6900.

The SCUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

TNUa Provides the TDM switching and serves as the center of the circuit switched domain. l Assigns the resources of the TDM

network and establishes the network connection.

l Provides the communication processing on the GE port.

The TNUa board is applicable to the BSC6900 GSM and the BSC6900 GU.




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Board Type

Board Name


Clock processing board

GCUa Obtains the system clock source, performs the functions of phase-lock and holdover, and provides clock signals.

The GCUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS. The GCGa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GCGa l Obtains the system clock source, performs the functions of phase-lock and holdover, and provides clock signals.

l Receives and processes the GPS signals.

Signaling processing board

SPUa Manages user plane and signaling plane resources in the subrack and processes signaling. Differences: The SPUa board processes the signaling on the GSM/UMTS signaling plane. The XPUa board processes the signaling on the GSM signaling plane.

The SPUa board is applicable to the BSC6900 GSM, BSC6900 UMTS and BSC6900 GU. The XPUa board is applicable to the BSC6900 GSM and BSC6900 GU.

XPUa

SPUb Manages user plane and signaling plane resources in the subrack and processes signaling. Differences: The SPUb board processes the signaling on the GSM/UMTS signaling plane. The processing capability of the SPUb board is 75% to 100% higher than that of the SPUa board. The XPUb board processes the signaling on the GSM signaling plane. The processing capability of the XPUb board is 75% to 100% higher than that of the XPUa board.

The SPUb board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS. The XPUb board is applicable to the BSC6900 GSM and BSC6900 GU.

XPUb

Service processing board

DPUb Processes CS services and PS services within the system. Differences: The DPUb board processes the services on the UMTS user plane, encodes and decodes the GSM speech services and

The DPUb board is applicable to the BSC6900 GU, and BSC6900 UMTS. The DPUc board is applicable to the

DPUc




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Board Type

Board Name


DPUd data services, and converts the speech frame format over the IP speech channel and the speech channel in HDLC transmission optimization. The DPUc board encodes and decodes the GSM speech services and converts the speech frame format over the IP speech channel and the speech channel in HDLC transmission optimization. The DPUd board processes the GSM data services.

BSC6900 GSM and BSC6900 GU. The DPUd board is applicable to the BSC6900 GSM and BSC6900 GU.

DPUe Processes CS services and PS services within the system. The DPUe board processes the services on the UMTS user plane.

The DPUe board is applicable to the BSC6900 UMTS and BSC6900 GU.

Interface processing board

AEUa l Provides 32 channels of ATM over E1s/T1s.

l Extracts the clock signals and sends the signals to the GCUa or GCGa board.

The AEUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

AOUa l Provides two channels of ATM over channelized optical STM-1/OC-3

l Supports ATM over E1/T1 over SDH or SONET.

l Provides 126 E1s or 168 T1s. l Extracts the clock signals and sends the

signals to the GCUa or GCGa board.

The AOUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

EIUa l Provides 32 E1s/T1s. l Transmits, receives, encodes, and

decodes the 32 E1s/T1s. The E1 transmission rate is 2.048 Mbit/s; the T1 transmission rate is 1.544 Mbit/s.

The EIUa board is applicable to the BSC6900 GSM and BSC6900 GU.

FG2a l Provides eight channels over FE electrical ports or two channels over GE.

l Supports IP over FE/GE.

The FG2a board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GOUa l Provides two channels over GE. l Supports IP over GE.

The GOUa board is applicable to the BSC6900 GSM, BSC6900 GU and BSC6900 UMTS.




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Board Type

Board Name


OIUa l Provides one channel over STM-1. l Provides one channelized STM-1 with

the rate of 155.52 Mbit/s.

The OIUa board is applicable to the BSC6900 GSM and BSC6900 GU.

PEUa l Provides 32 channels of IP over E1s/T1s.


The PEUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

POUa l Provides two channels of IP over channelized optical STM-1/OC-3.

l Supports IP over E1/T1 over SDH/SONET.

l Provides the load bearer capability of 126 E1s or 168 T1s.


The POUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

UOIa l Provides four channels over the unchannelized STM-1/OC-3c.

l Supports ATM/IP over SDH/SONET. l Extracts the clock signals and sends the


The UOIa board is applicable to the BSC6900 UMTS and BSC6900 GU.

AOUc l Provides four channels of ATM over channelized optical STM-1/OC-3.

l Supports ATM over E1/T1 over SDH or SONET.

l Provides 252 E1s or 336 T1s. l Extracts the clock signals and sends the


The AOUc board is applicable to the BSC6900 UMTS and BSC6900 GU.

FG2c l Provides 12 channels over FE or 4 channels over GE.

l Supports IP over FE/GE.

The FG2ac board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GOUc l Provides four channels over GE. l Supports IP over GE.

The GOUc board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.




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Board Type

Board Name


POUc l Provides four channels of TDM/IP over channelized optical STM-1/OC-3.

l Supports IP over E1/T1 over SDH/SONET.

l Provides the load bearer capability of 252 E1s or 336 T1s.


The POUc board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

UOIc l Provides eight channels over unchannelized STM-1/OC-3c.

l Supports ATM over SDH/SONET. l Extracts the clock signals and sends the


The UOIc board is applicable to the BSC6900 GU and BSC6900 UMTS.

If operators use Huawei Nastar, operators need to install the SAU board in the MPS or EPS of the BSC6900 cabinet (the SAU board occupies two slots that work in active/standby mode).

2.3 Software Architecture The BSC6900 GU software is designed with a layered architecture in terms of software. Each layer is dedicated to its own functions and provides services for other layers; however, each layer hides the technical implementation details and physical topology from other layers. Figure 2-4 shows the software architecture of the BSC6900 GU.

Figure 2-4 Software architecture of the BSC6900 GU

Infrastructure

SMP

ICCP

STCP

Application




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Table 2-5 describes the functions of each layer in the software architecture.

Table 2-5 Functions of each layer in the BSC6900 GU software architecture

Layer Function

Infrastructure l Provides the hardware platform and hides the lower-layer hardware implementations.

l Hides the differences for operating systems, and provides enhanced and supplementary functions for the system.

Service Management Plane (SMP)

Provides the OM interface to perform the OM functions of the system.

Internal Communication Control Plane (ICCP)

l Transfers internal maintenance messages and service control messages between different processors, thus implementing efficient control over distributed communication.

l Operates independent of the infrastructure layer.

Service Transport Control Plane (STCP)

l Transports the service data on the user plane and control plane at the network layer between NEs.

l Separates the service transport technology from the radio access technology and makes the service transport transparent to the upper-layer service.

l Provides service bearer channels.

Application l Implements the basic functions of BSC service control and concentrates on the upper-layer service control, such as call processing, mobility management, and RRM.

l Hides the topology characteristics of various resources in the network and in the equipment.

l Provides the resource access interface, hides the distribution of internal resources and network resources, maintains the mapping between the service control and resource instance, and controls the association between various resources.

l Manages the resources and OM status, responds to the resource request from the upper layer, and hides the resource implementation from the upper layer.

l Isolates the upper-layer services from the hardware platform to facilitate the hardware development.

2.4 Reliability The resource pool design and redundancy mechanism are widely used in the system reliability design of the BSC6900 GU. The techniques of detecting and isolating the faults in the boards




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and in the system are optimized and the software fault tolerance capability is improved to enhance the system reliability.

2.4.1 System Reliability The BSC6900 GU system reliability is designed with the following features:

l High-reliability architecture design The design of dual switching planes, with up to 120 Gbit/s GE star non-blocking switching capability per subrack, solves the bottleneck problem and prevents the single point failure in the deployment of the high-capacity BSC6900 GU. Moreover, port trunking technology is adopted on the switching boards. The port trunking function allows data backup in case of link failure, thus preventing inter-plane switchover and cascading switchover and improving the reliability of intra-system communication. Dual clock planes are used in clock transmission between the GCUa/GCGa board and the SCUa board. Thus, a single point of failure does not affect the normal operation of the system clock.

l Resource pool design In case of overload, the system implements load sharing between the control plane and the user plane by employing the full resource pool design. This effectively avoids suspension because of overload, thus improving the resource utilization and system reliability.

l Redundancy mechanism All the hardware in the BSC6900 GU adopts the redundancy mechanism. The rapid switchover between active and standby parts improves the system reliability. Moreover, with the quick fault detection and rectification feature, the impact of the faults on the service is minimized.

l Flow control The system performs flow control based on the CPU and memory usage. Thus, the BSC6900 GU can continue working by regulating the items pertaining to performance monitoring, resource auditing, and resource scheduling in the case of CPU overload and resource congestion. In this way, the system reliability is enhanced.

2.4.2 Hardware Reliability The BSC6900 GU hardware reliability is designed with the following features:

l The system uses the multi-level cascaded and distributed cluster control mode. Several CPUs form a cluster processing system. Each module has distinct functions. The communication channels between modules are based on the redundancy design or anti-suspension/breakdown design.

l The system uses the redundancy design, as described in Table 2-6, to support hot swap of boards and redundancy of important modules. Therefore, the system has a strong fault tolerance capability.




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Table 2-6 Board redundancy

Board Redundancy Mode

AEUa Board redundancy

AOUa/AOUc Board redundancy + MSP 1:1 optical port redundancy or MSP 1+1 optical port redundancy

DPUb/DPUc/DPUd/DPUe Board resource pool

EIUa Board redundancy

FG2a/FG2c Board redundancy + GE/FE port redundancy or load sharing

GCUa/GCGa Board redundancy

GOUa/GOUc Board redundancy + GE port redundancy or load sharing

OIUa Board redundancy

OMUa Board redundancy

PEUa Board redundancy

POUa/POUc Board redundancy + MSP 1:1 or MSP 1+1 optical port redundancy

SCUa Board redundancy + port trunking on GE ports

SPUa/SPUb/XPUa/XPUb Board redundancy

TNUa Board redundancy

UOIa/UOIc Board redundancy + MSP 1:1 or MSP 1+1 optical port redundancy

l Isolation mechanism is used. When entity A fails to accomplish a task, entity B that has the same functions as entity A takes over the task. Meanwhile, entity A is isolated until it is restored.

l When a board with a single function is faulty, you can restart the board. l All boards support dual-BIOS. Faults at one BIOS do not affect the startup or operation

of the boards. l The system uses the non-volatile memory to store important data. l With advanced integrated circuits, the system features high integration, sophisticated

technology, and high reliability. l All the parts of the system are of high quality and pass the aging test. The process of

hardware assembly is strictly controlled. These methods ensure the high stability and reliability for long-term operation.

2.4.3 Software Reliability The BSC6900 GU software reliability is designed with the following features:




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l Scheduled check on crucial resources The software check mechanism checks various software resources in the system. If a resource deadlock occurs because of software faults, the check mechanism can release the locked resources and generate related logs and alarms.

l Task monitoring When the software is running, internal software faults and some hardware faults can be monitored through the monitoring process. The monitoring process monitors the task operating status and reports errors to the OM system.

l Data check The software performs regular or event-driven data consistency check, restores the data selectively or preferably, and generates logs and alarms.

l Data backup Both the data in the OMU database and the board data can be backed up to ensure data reliability and consistency.

l Operation logs The system automatically records the history operations into logs. The operation logs help in locating and rectifying the faults caused by improper operations.




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3 Configurations

3.1 Overview In the BSC6900 GU, the MPS or EPS can be either a GSM subrack or a UMTS subrack.

Based on the TCS configuration, the BSC6900 GU supports three types of configuration modes: BM/TC combined, BM/TC separated, and A over IP. The system specifications vary according to the boards configured in the BSC6900 GU.

The MPS and EPS are generally called basic module (BM), and the TCS is called transcoder (TC) for short. Table 3-1 describes the configuration modes of the BSC6900 GU based on the TCS configuration.

Table 3-1 Configuration modes of the BSC6900 GU

Configuration Mode

Description Characteristic

BM/TC combined

The BSC is not configured with the TCS. The boards that implement the TC functions are inserted into the slots in the MPS or EPS.

With the same capacity, less cabinets and less subracks are required in the BSC, thus increasing the hardware integration.

BM/TC separated

This mode is applicable to the scenario where the BSC is configured in a remote equipment room. In this mode, the BSC is configured with a separate TCS, which is placed in the TCR on the MSC side.

The TCS can be configured in the TCR on the MSC side, thus saving the transmission resources between the BSC and the MSC.




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Configuration Mode

Description Characteristic

A over IP The BSC6900 GU is not configured with a TCS. The TC functions are implemented by the MGW.

The BSC is directly connected to the core network without a TC, thus reducing the CAPEX of the operator. In addition, the number of speech coding and decoding times is decreased to improve the speech quality. The A over IP mode meets the needs for network evolution.

3.2 Hardware Configuration Specifications in BM/TC Combined Mode

Table 3-2 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in BM/TC combined mode is configured with the HW60 R8/HW68 R11 boards.

Table 3-2 Typical configuration specifications of a single BSC6900 GU subrack (1)

Subrack MPS(UMTS) EPS(UMTS) MPS(GSM) EPS(GSM)

Traffic volume (Erl)

7,200 10,800 3,250 4,875

PS (UL + DL) data throughput (Mbit/s)

460 690 NA NA

Number of NodeBs

200 300 NA NA

Number of cells

600 900 512 768

Number of TRXs

NA NA 512 768

Number of active PDCHs (MCS-9)

NA NA 2,048 3,072




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NOTE The traffic volume is calculated on the basis of Huawei traffic model. The N/A in the table indicates that the data is not available at present. You can calculate the capacity specifications in any typical subrack combination mode by using the preceding data.

Table 3-3 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in BM/TC combined mode is configured with the HW69 R11 boards.



Traffic volume (Erl) 13,400 13,400 3,250 6,500


2,000 2,000 NA NA

Number of NodeBs 540 720 NA NA

Number of cells 1,200 1,200 512 1,024

Number of TRXs NA NA 512 1,024


NA NA 2,048 4,096


3.3 Hardware Configuration Specifications in BM/TC Separated Mode

Table 3-4 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in BM/TC separated mode is configured with the HW60 R8/HW68 R11 boards.




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460 690 NA NA


Number of cells 600 900 512 768

Number of TRXs NA NA 512 768


NA NA 2,048 3,072


Table 3-5 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in BM/TC separated mode is configured with the HW69 R11 boards.





2,000 2,000 NA NA


Number of cells 1,200 1,200 1,024 1,536

Number of TRXs NA NA 1,024 1,536


NA NA 4,096 6,144





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3.4 Hardware Configuration Specifications in A over IP Mode

Table 3-6 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in A over IP mode is configured with the HW60 R8/HW68 R11 boards.





460 690 NA NA


Number of cells 600 900 512 768

Number of TRXs NA NA 512 768


NA NA 2,048 3,072


Table 3-7 lists the typical configuration specifications of a single subrack when the SRAN5.0 BSC6900 GU in A over IP mode is configured with the HW69 R11 boards.





2,000 2,000 NA NA


Number of cells 1,200 1,200 1,024 2,048

Number of TRXs NA NA 1,024 2,048


NA NA 4,096 8,192




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4 Operation and Maintenance

4.1 Overview The BSC6900 GU provides convenient local maintenance and remote maintenance, and it supports multiple OM modes.

The BSC6900 GU provides a hardware-independent universal OM mechanism and provides OM functions such as security management, fault management, alarm management, equipment management, and software management.

The Man Machine Language (MML) provides OM and configuration functions, and the Graphic User Interface (GUI) provides the OM functions. The two modes meet the requirements of different operation environments.

Figure 4-1 shows the OM networking of the BSC6900 GU.

Figure 4-1 OM system of the BSC6900 GU

Alarm box

VLAN

LMT LMT

iManager M2000

BSC6900 GU




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The OM system of the BSC6900 GU adopts the browser/server (B/S) separated mode. The OMUa board of the BSC6900 GU works as the server, and the LMT is used for local maintenance. The iManager M2000 is the centralized OM system, which is used for remote maintenance.

The alarm box connects to the LMT and provides audible and visible indications for alarms.

4.2 Benefits

Web-based LMT Improving User Experience The OM system of the BSC6900 GU uses the web-based LMT, which need not be installed with any OM software. You can connect the LMT to the OMUa to perform OM functions and obtain the online help of the LMT. All the operation results are displayed on the LMT through the web browser.

The web-based LMT does not require software installation and software upgrade, thus simplifying user operation and improving user experience.

Diversified OM Modes The BSC6900 GU provides local maintenance and remote maintenance and supports multiple OM modes to meet the operation needs in various OM scenarios.

The LMT used for local maintenance can access the BSC6900 GU in the following ways:

l Through the port on the panel of the OMUa board l Through the Virtual Local Area Network (VLAN) l Through the Intranet and Internet

The iManager M2000 used for remote maintenance can access the BSC6900 GU in the following ways:

l Through the VLAN l Through the Intranet and Internet

Powerful Hardware Management Functions for Rapidly Locating and Rectifying Hardware Faults

The BSC6900 GU provides precaution mechanism for hardware fault, thus ensuring that sufficient time is available to rectify the fault in time before the services are disrupted.

The BSC6900 GU provides functions such as status query, data configuration, and status management of the internal physical devices.

When a hardware fault occurs, the BSC6900 GU alerts the user by generating alarms and flashing indicators and provides suggestions to guide the user in troubleshooting. The alarm is cleared upon the rectification of the fault.

The BSC6900 GU provides the functions of isolating the faulty part, such as activating or deactivating the faulty part. When a faulty part needs to be replaced, the hot swapping




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function enables the rapid power-on of the substitute, thus reducing the time in fault rectification.

In case of emergency, you can reset the board to quickly rectify the fault.

Advanced Software Management Functions for Secure and Smooth Upgrade The BSC6900 GU provides the remote upgrade tool, which enables the operator to upgrade the software at the operation and maintenance center without affecting the ongoing services. The remote upgrade tool provides the function of backing up the crucial data in the system. When the upgrade fails, version rollback is performed immediately and the system returns to normal in a short period.

After the upgrade is complete, version consistency check is performed to ensure the version correctness.

Rich Tracing and Detection Mechanisms for Reliably Monitoring the Network Status

The BSC6900 GU provides the tracing and detection functions of multiple layers and multiple levels to accurately locate faults. The tracing and detection functions include user tracing, interface tracing, message tracing, fault detection on the physical layer, fault detection on the data link layer, and detection of other faults.

The tracing messages are saved as files, which can be viewed through the review and tracing functions of the LMT.

Easy Equipment Installation, Commissioning, and Efficient Network Upgrade Scheme for Rapid Network Establishment

Before delivery, Huawei BSC6900 GU is installed with boards, operating system, and common data. In addition, it is correctly assembled and passes the rigid test. You only need to install the cabinet and cables on site. After the hardware installation is complete, you can load software and data files to commission the software and hardware.

The BSC6900 GU can be configured as one of the three variants through board adjustment and software upgrade, thus facilitating the smooth evolution between GSM, GSM&UMTS, and UMTS. In addition, the BSC6900 GU provides the 2G/3G convergence solution and protects investment on equipment.




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5 Technical Specification

5.1 Technical Specifications 5.1.1 Capacity Specifications

Item Specification

System Capacity of SRAN5.0 (HW60 R8/HW68 R11 Boards)

System Capacity of SRAN5.0 (HW69 R11 Boards)

UMTS network

Traffic volume (Erl) 54,000 80,400


3,450 12,000

Number of NodeBs 1,500 3,060

Number of cells 4,500 5,100

GSM network

Traffic volume (Erl) 13,000 24,000

Number of cells 2,048 2,048

Number of TRXs 2,048 4,096

Number of configured PDCHs

15,360 30,720


8,192 16,384

Gb interface throughput (Mbit/s)

512 1,536




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Item Specification

System Capacity of SRAN5.0 (HW60 R8/HW68 R11 Boards)

System Capacity of SRAN5.0 (HW69 R11 Boards)

NOTE The system capacity of the BSC6900 GU cannot reach the maximum in the UMTS network and GSM network at the same time.

5.1.2 Structural Specifications Item Specification

Cabinet standard The structural design conforms to the IEC60297 standard and IEEE standard.

Dimensions (height x width x depth)

N68E-22 cabinet: 2,200 mm x 600 mm x 800 mm N68E-21-N cabinet: 2,130mm x 600 mm x 800 mm

Height of the available space

N68E-22 cabinet: 46 U N68E-21-N cabinet: 44 U

Cabinet weight N68E-22 cabinet: ≤ 320 kg N68E-21-N cabinet: ≤ 380 kg

Load-bearing capacity of the floor in the equipment room

≥ 450 kg/m2

5.1.3 Clock Specifications Item Specification

Clock precision It meets the requirements for the stratum-3 clock.

Clock accuracy ±4.6 x 10-6

Pull-in range ±4.6 x 10-6

Maximum frequency offset 2 x 10-8/day

Initial maximum frequency offset

1 x 10-8




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5.1.4 Electrical Specifications Item Sub-Item Specification

Power input Power input –48 V DC

Power range –40 V to –57 V

Power consumption of a single subrack (GSM network)

MPS: ≤ 1,200 W EPS: ≤ 1,200 W TCS: ≤ 1,000 W

Power consumption of a single subrack (UMTS network)

MPS: ≤ 1,560 W EPS: ≤ 1,540 W

NOTE You can calculate the power consumption of the cabinet in any subrack combination mode by using the preceding data.

5.1.5 Space Specifications Item Recommended Value Position in

Figure 5-1

Distance between the cable ladder and the wall

800 mm 1)

Distance between the side of the cabinet and the cable ladder

200 mm 2)

Distance between the side of the cabinet and the wall

800 mm 5)

Width of the main aisle 1,000 mm 4)

Distance between the front (rear) side of the cabinet and the wall

800 mm 3)

Distance of cabinet front (rear) between two adjacent cabinet rows

1,800 mm 6)




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Figure 5-1 Space requirements in the equipment room

l In overhead cabling mode, the distance between the cabinet top and the ceiling of the equipment room must be greater than or equal to 1,000 mm.

l In underfloor cabling mode, the height of the electrostatic discharge (ESD) floor must be greater than or equal to 200 mm.

5.1.6 Environmental Specifications Item Specification

Storage Environment

Transportation Environment

Operating Environment

Temperature range –40ºC to +70ºC –40ºC to +70ºC Long-term: 0ºC to 45ºC Short-term: –5ºC to +55ºC

Humidity range 10% RH to 100% RH

5% RH to 100% RH

Long-term: 5% RH to 85% RH Short-term: 5% RH to 95% RH

NOTE Short-term operation refers to the operation with the duration not more than 96 hours at a time and with the accumulative duration not more than 15 days a year.




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5.1.7 Transmission Ports Transmission Type Connector

E1/T1 DB44

Channelized STM-1/OC-3 LC/PC

Unchannelized STM-1/OC-3c LC/PC

FE RJ45

GE RJ45

LC/PC

5.1.8 Reliability Specifications Item Specification

System availability > 99.999%

Mean Time Between Failures (MTBF)

≥ 358,100 hours (HW60 R8/HW68 R11 boards are configured) ≥ 423,000 hours (HW69 R11 boards are configured)

Mean Time To Repair (MTTR) ≤ 1 hour

5.2 Compliance Standards 5.2.1 Power Supply Standards

Item Standard

Power supply ETS300 132-2

5.2.2 Grounding Standards Item Standard

Grounding ETS300 253




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5.2.3 Environment Standards Item Standard

Noise ETS300 753

GR-63-CORE

5.2.4 Safety Standards Item Standard

Earthquake-proofing ETS300 019-2-4-AMD

GR-63-CORE

YDN5083

Safety IEC60950, EN60950, UL60950

IEC60825-1

IEC60825-2

IEC60825-6

GB4943

GR-1089-CORE

Surge protection IEC 61024-1 (1993)

IEC 61312-1 (1995)

IEC 61000-4-5 (1995)

ITU-T K.11 (1993)

ITU-T K.27 (1996)

ITU-T K.41 (1998)

EN 300 386 (2000)

GR-1089-CORE (1999)

YDJ 26-89

GB 50057-94

YD5098-2001




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5.2.5 EMC Standards Item Standard

Electromagnetic compatibility (EMC)

ETSI EN 300 386 V1.3.2 (2003-05)

CISPR 22 (1997)

IEC61000-4-2

IEC61000-4-3

IEC61000-4-4

IEC61000-4-5

IEC61000-4-6

IEC61000-4-29

GB9254-1998

FCC Part 15

NEBS Bellcore GR-1089-CORE issue 2

5.2.6 Environment Standards Item Standard Class

Storage environment ETS300 019-1-1 CLASS 1.2

Transportation environment

ETS300 019-1-2 CLASS 2.3

Operating environment ETS300 019-1-3 CLASS 3.1




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6 Acronyms and Abbreviations

Acronym and Abbreviation Expansion

3GPP Third Generation Partnership Project

ATM Asynchronous Transfer Mode

BHCA Busy Hour Call Attempt

BM/TC Basic Module/Transcoder

Co-RRM Co-Radio Resource Management

CPU Central Processing Unit

DSP Digital Signal Processor

EPR Extended Processing Rack

EPS Extended Processing Subrack

FE Fast Ethernet

GE Gigabit Ethernet

GUI Graphic User Interface

ICCP Internal Communication Control Plane

IP Internet Protocol

LMT Local Maintenance Terminal

LTE Long Term Evolution

MAC Media Access Control

MGW Media Gateway

MML Man Machine Language

MPR Main Processing Rack




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Acronym and Abbreviation Expansion

MPS Main Processing Subrack

MSP Multiplex Section Protection

MTBF Mean time between failures

MTTR Mean Time To Recovery

OM Operation & Maintenance

OS Operating System

PDCH Packet Data CHannel

PPP Point-to-Point Protocol

PS Packet Switched

RRM Radio Resource Management

SDH Synchronous Digital Hierarchy

STCP Service Transport Control Plane

SMP Service Management Plane

TCH Traffic Channel

TCR TransCoder Rack

TCS TransCoder Subrack

TDM Time Division Multiplexing

TRX Transceiver

VLAN Virtual Local Area Network

2.7.1.1 SRAN5_0 BSC6900 Product Description

Documents