2 BSC RNC 6900 Hardware Structure and System Description 2

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

www.huawei.com

Internal

BSC RNC6900

Hardware System

Structure

BSC RNC6900V900R014

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

Abbreviation

RNC Radio Network Controller

UTRAN Universal Terrestrial Radio Access Network

CN Core Network

CS Circuit Switch

PS Package Switch

CBC Cell Broadcast Center

MPR Main Processing Rack

EPR Extended Processing Rack

BHCA Busy Hour Call Attempt

MPS Main Processing SubRack

EPS Extended Processing SubRack

SCUa RNC Switch and control unit REV: a

OMUa RNC operation and maintenance unit REV:a

SPUa/SPUb RNC signaling processing unit REV: a

DPUb/DPUe RNC data processing unit REV: b


Abbreviation

GCUa/GCGa RNC General Clock Unit REV: a

RINT WCDMA RNC Interface board

MAC Medium Access Control

RFN RNC Frame Number

PPS Pulse Per Second

AEUa RNC 32-port ATM over E1/T1/J1 interface Unit REV:a

AOUa/AOUc RNC 2-port ATM over channelized Optical STM-1/OC-3 Interface

Unit REV:a

UOIa/UOIc RNC 4-port ATM/IP over Unchannelized Optical STM-1/OC-3c

Interface unit REV:a

PEUa RNC 32-port Packet over E1/T1/J1 Interface Unit REV:a

FG2a/FG2c RNC packet over electronic 8-port FE or 2-port GE ethernet

Interface unit REV:a

GOUa/GOUc RNC 2-port packet over Optical GE ethernet Interface Unit REV:a

POUa/POUc RNC 2-port packet over channelized Optical STM-1/OC-3 Interface

Unit REV:a


Chapter 1 BSC RNC6900 System Overview

Chapter 2 BSC RNC6900 Hardware Structure

Chapter 3 BSC RNC6900 Signal Flows

Chapter 4 BSC RNC6900 System Hardware Configuration


UMTS Network Configurarion

RNC

RNC

NodeB

NodeB

NodeB

CS

PS

CBC

UE UTRAN CN Uu Iu

Iu-CS

Iu-PS

Iu-BC

Iur

Iub

Iub

RNCs (Radio Network Controller) and NodeBs compose the UTRAN (UMTS

Terrestrial Radio Access Network)

RNC performs system information broadcasting, handover, cell resource

allocation, radio resource management and so on

Huawei RNC is named as BSC RNC6900 UMTS


BSC RNC6900 Out shape

BSC RNC6900 subrack use the 12 U shielding subrack of

Huawei.

There are 28 slots in the subrack, the subrack backplane is

positioned in the middle, and front and rear boards are

installed on both sides of the backplane

Subrack type: MPS and EPS

BSC RNC6900 system can hold up to 1 MPR+1EPR

Main Processing Subrack (MPS*1)

Extended Processing Subrack (EPS*5)

Power distribution box*2

2200mm

600mm


DIP Switch on the Subrack

Bit Description

1-5 Bits 1 to 5 are used for setting the subrack number. Bit 1 is the

least significant bit. If the bit is set to ON, it indicates 0. If the bit is

set to OFF, it indicates 1.

6 Odd parity check bit

7 Reserved, undefined, generally set to ON

8 Startup type of the subrack, generally set to OFF

For the new sites in BSC RNC6900, the bit is conservative and is fixed to OFF.

Page 8

Subrack No. Bit

1 2 3 4 5 6 7 8

0 0 0 0 0 0 0 0 1

ON ON ON ON ON ON ON OFF

1 1 0 0 0 0 1 0 1

OFF ON ON ON ON OFF ON OFF

2 0 1 0 0 0 1 0 1

ON OFF ON ON ON OFF ON OFF

3 1 1 0 0 0 0 0 1

OFF OFF ON ON ON ON ON OFF

4 0 0 1 0 0 1 0 1

ON ON OFF ON ON OFF ON OFF

5 1 0 1 0 0 0 0 1

OFF ON OFF ON ON ON ON OFF


WCDMA RNC MPS&EPS

MPS BRD configuration

WCDMA RNC operation and maintenance unit

(OMUa/ OMUc)

WCDMA RNC signaling processing unit (SPUa/SPUb)

WCDMA RNC data processing unit (DPUb/DPUe)

WCDMA RNC Switch and control unit (SCUa/ SCUb)

WCDMA RNC General Clock Unit (GCUa/GCGa)

WCDMA RNC Interface board (FG2c/GOUc)

EPSs BRD configuration

WCDMA RNC Interface Board (WINT)

WCDMA RNC signaling processing unit (SPUa/SPUb)

WCDMA RNC data processing unit (DPUb/DPUe)

WCDMA RNC Switch and control unit (SCUa/SCUb)


UMTS BSC RNC6900 logic system

structure

Logically, the BSC RNC6900 consists of the following five subsystems:

Function:

Switching (SCU & backplane channels)

Service Processing (SPUb/DPUe)

Interface Processing ( GOUc, FG2c)

Clock Synchronization (GCUa)

OM (OMUc)

LMT/M2000

Clock synchronization

subsystem

Switching

subsystem

Interface

processing

subsystem

Service processing

subsystem

OM subsystem

To BTS/NodeB

To MSC

To other BSCs/RNCs

To SGSN

Clock (optional)

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page11

Switching Subsystem

The switching subsystem performs the

following functions:

Provides data and signaling switching

Intra-subrack Media Access Control (MAC) switching

Provides OM channels

Distributes clock signals to each service board


SCUb

The SCUb board provides maintenance

management and GE switching platform

for the subrack where the SCUb is inserted.

In this way, MAC switching can be carried

out inside the BSC RNC6900. The internal

switching contributes to interconnections

between modules in the BSC RNC6900.

The SCUb board can replace the original

SCUa board. Compared with the SCUa,

the switching capacity of the SCUb

increases significantly from 60 Gbit/s to

240 Gbit/s.

SCUa SCUb


SCUb Interconnections

Ports 0 to 7 are GE ports. Every two adjacent ports form a trunk

(Trunk refers to a group of integrated ports and belongs to the data

link layer over TCP/IP). Ports 6 and 7 are used to connect to the

GBAM.

Ports 8 to 11 are 10GE ports.

If all subracks are equipped with SCUa boards, the subracks are

connected in star topology; if all subracks are equipped with SCUb

boards, the subracks are connected in chain topology.


Inter-subrack cable connections

between SCUb boards

by using SFP+ high-speed cables

(MPR/EPR in full configuration)

Blue lines indicate the SFP+ high-

speed cables.

Green lines indicate the unshielded

straight-through cables.

Connection

0-2-4

0-1-3-5

Interconnections Between SCUb Boards


Service Processing Subsystem

The service processing subsystem performs

the following functions:

User data and signaling processing

Radio channel ciphering and deciphering

Radio resource management and control

System information and user message tracing


SPUb Board

signaling

SSN0 MPU

SSN7 SPU

signaling

SSN0 SPU

SSN7 SPU

Main control

SPUb Non-main control

SPUb

Components and Functions

The SPUb board has eight subsystems.

Main control SPUa board (MPU)

Manages the user plane resources; manages the

load sharing of the user plane resources between

subracks

Maintains the load of the control plane within the

subrack; exchanges the load information on the

control planes between subracks

Non-main control SPUb board (SPU)

Processes upper-layer signaling over the Uu, Iu,

Iur, Iub, A, Um, Abis, and Ater interfaces

Work mode: active and standby

The processing capability of the SPUb board

is higher than the SPUa board by 75% to

100%.


DPUe Board

Components

28 hardware threads

Functions

The DPUe board processes UMTS voice services and data services.

Selects and distributes data

Multiplexes and demultiplexes

Performs the functions of the GTP-U, IUUP, PDCP, RLC, MAC, and FP

protocols

Processes the Multimedia Broadcast and Multicast Service (MBMS) at

the RLC layer and the MAC layer

Work mode: resource pool


Interface Processing system

The interface processing subsystem processes transport

network messages. It also hides the differences between

transport network messages within the BSC RNC6900.

On the uplink, the interface processing subsystem terminates

transport network messages at the interface boards.

It also transmits the user plane, control plane, and

management plane datagrams to the corresponding service

processing boards.

The processing of the signal flow on the downlink is the

reverse of the processing of the signal flow on the uplink.

Page 18


Interface Processing Subsystem Board Introduction

RINT

AEUa 32 port ATM over E1/T1/J1 Iub

AOUa 2-port ATM over channelized Optical STM-1/OC-3 Iub

AOUc 4-port ATM over channelized Optical STM-1/OC-3 IuIurIub

POUa 2 channels over channelized optical STM-1/OC-3 ports

based on IP protocol

Iub

POUc 4 channels over channelized optical STM-1/OC-3 ports

based on IP protocol

IurIub

UOIa 4 port unchannelized STM-1/OC-3c optical IuIu-BCIurIub

UOIc 8 port unchannelized STM-1/OC-3c optical IuIurIub

PEUa 32 channels of IP over PPP/MLPPP over E1/T1 Iub

FG2a eight channels over FE ports or two channels over GE ports IuIu-BCIurIub

FG2c 12 channels over FE ports or three channels over GE ports IuIurIub

GOUa two channels over GE optical ports IuIu-BCIurIub

GOUc four channels over GE optical ports IuIurIub


FG2c Board

Functions

Provides transmission of IP over Ethernet

Provides 12 channels over FE ports or 4 channels over

GE electrical ports

Provides the routing-based backup and load sharing

Supports the A, Abis, Gb, Iu, Iur, and Iub interfaces

Supports 2048 TRXs when serving as the Abis interface

board, supports 23040 CICs when serving as the A

interface board, and supports a maximum data flow of

1024 Mbit/s when serving as the Gb interface board

10M/100M/1000M

10M/100M


GOUc Board

Functions

Provides four channels over GE ports, which are used for IP transmission

Provides the routing-based backup and load sharing

Supports the extraction of line clock signals

Supports the A, Abis, Gb, Iu, Iur, and Iub interfaces

Supports 2048 TRXs when serving as the Abis interface board, supports

23040 CICs when serving as the A interface board, and supports a

maximum data flow of 1024 Mbit/s when serving as the Gb interface

board

Optical module is 1250 Mbit/s


Clock Subsystem

I

N

T

I

N

T

S

C

U

a

I

N

T

I

N

T

S

C

U

a

S

C

U

a

GCUa

Clock module

MPS

8 kHz

To NodeB

EPS EPS 8 kHz

19.44 MHz, 32.768 MHz, 8 kHz

Clock cable High-speed backplane channel

CN BITS GPS

To BTS

To MBTS

19.44 MHz, 32.768

MHz, 8 kHz

19.44 MHz, 32.768

MHz, 8 kHz


Structure of the RNC Clock Connection

RNC Line Clock

Signal Cables

Installing RNC Y-Shaped

Clock Signal Cables RNC BITS Clock

Signal Cables


OM subsystem

OM of the BSC RNC6900 is performed in the following

scenarios: routine maintenance, emergency maintenance,

troubleshooting, device upgrade, and capacity expansion.

Page 24


OMUc

The OMUc board occupies one slot and is equipped with

one hard disk.

By using the Intel Jasper processor and Ibex Peak chip

set, the OMUc provides high-performance service

processing and calculation capabilities.

The OMUc board can be installed with a 2.5-inch SATA

hard disk of 500 GB.

The OMUc board can be installed in slots 0 to 3 or slots

20 to 27.


Chapter 1 BSC RNC6900 System Overview

Chapter 2 BSC RNC6900 Hardware Structure

Chapter 3 BSC RNC6900 Signal Flows

Chapter 4 BSC RNC6900 System Hardware Configuration


BSC RNC6900 System Signal Flows

BSC RNC6900 system signal flows including:

Control plane message flows

Uu interface message flow

Iub interfaces message flows

Iur/Iu interfaces message flows

User plane data flows

UMTS Signal Flow Between Iub and Iu-CS/Iu-PS

OM signal flows


Signal Flow on the Uu Interface

Intra-RNC Control Message Flow on the Uu Interface


Signal Flow on the Iub Interface


Signal Flow on the Iu/Iur Interfaces

Intra-RNC Control Message Flow on the Iu/Iur Interface


Data Flow Between Iub and Iu-CS/Iu-PS

Intra-RNC Data Flow Between Iub and Iu-CS/Iu-PS


The OM signal flow of the BSC RNC6900

Page 33


BSC RNC6900 System Hardware

Configuration

Page 34


BSC RNC6900 Specification

80,400

BSC RNC6900 UMTS

BHCA (k) 5300

BHCA (k)(Include SMS) 7000

Traffic volume (Erlang) 167,500

PS (UL+DL) Data Throughput (Mbit/s) 40,000

Number of NodeBs 3060

Number of cells 5100

Power input -48 V DC

Power range -40 V to -57 V

Power consumption of a

single UMTS subrack

In ATM transmission:

l MPS: 1700 W

l EPS: 1730 W

In IP transmission:

l MPS: 1490 W

l EPS: 1450 W

Power consumption of a

single cabinet

The cabinet power consumption equals the sum of power consumption of all

subracks in the cabinet.

It is recommended that the power distribution system provide a maximum of

5100 W power per cabinet to facilitate capacity expansion.

Documents

2 BSC RNC 6900 Hardware Structure and System Description 2