ZTE SDR

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Introduction to GU SDR

Base Stations

1/17/13 2

Purpose

1/17/13 2

l

You are expected to master the following

knowledge after this course

n basic concepts and structure of SDR n Types of SDR base stations

n SDR hardware boards

内部公开 Internal Only▲

Contents

Basic Concepts of SDR

Structure of SDR Base Stations

Introduction to BBU

Introduction to RU/RRU

What is SDR

内部公开 Internal Only▲

Contents

Basic concepts of SDR

Structure of SDR Base Stations

Introduction to BBU

Introduction to RU/RRU

SDR technology brings changes to base station structure

n Significant feature of the SDR – software defined radio mode

1 The RF front end processes signals of multiple radio modes

2 Baseband processes signals of multiple radio modes

3 Software integration to unify software versions

SDR technology

– the system supports multiple radio modes

Structure of ZTE SDR base station

n Support the distributed structure of BBU and RRU. For

traditional base stations, BBU and RRU should be in the same module.

n Multi-mode RF platform

n Adopt IP technology to process internal data stream of the base

station

n OMC platform——OMCR and OMCB

n Unified software platform

The distributed structure of BBU and RRU and R&D on a unified platform are the core of the SDR base stations. The new structure meets the demand and technology required by the market.

ANT Transceive r Front end of Rx Duplex Multi-carrier PA External power PWS _220VAC

RRU/

RU

BBU baseband pool

Fiber

SDR product architecture

n Distributed base station: RF is distributed remotely

RRU

BB U

SDR product architecture

n Macro base station: BBU and RU are all in the cabinet, which is

Advantage 1 of the SDR architecture – BBU and

RRU can be distributed separately

n In this mode, both BBU and RRU and maximize their

efficiency. BBU can achieve the maximum integration, and RRU can focus on the power of itself.

n The networking is flexible if the RRU is distributed

remotely. For example, it can support multi-carrier and indoor distributed coverage.

n BBU and RRU can be distributed flexibly, which benefit

Advantage 2 of the SDR architecture – baseband hardware

n

Support multiple radio modes

n

Simple design

n

Powerful processing capability

n

Easy to manage

n

Easy to share resources

n

Cut cost

Advantage 3 of the SDR architecture – independent RF unit

n

Simplified functions

n

Improved reliability, easy for maintenance

n

Improved the efficiency of the power amplifier

n

Optimized heat design, easy for integration

n

Closer to antenna, hence bigger power

n

Flexible forms of RU/RRU products

n

Help to reduce the size and weight of base stations

Advantage 4 of the SDR architecture – unified interface between

BBU and RU/RRU

n The interface between BBU and RU/RRU is the exclusive

interface for communication between BBU and RU/RRU .

n The interface between BBU and RU/RRU supports such radio

modes as GSM, WCDMA etc.

n Support fiber interface and electrical interface

n Support 1.2288Gbps and 2.4576Gbps rate

n Support both star-type and link-type networking between BBU

and RU/RRU

n Support RU/RRU cascading-connection

n RRU can be distributed remotely. BBU can be kept 40 km away

Distributed base station: B8200 ＋ R8860

n B8200: powerful BBU

Support both GSM and WCDMA.

n R8860:

It supports GSM single-mode 6-carrier, or WCDMA single-mode 3-sector, or supports both radio modes at the same time.

ZXSDR BBU _ZXSDR RRU R F MS Um interface CPRI Fiber

Indoor dual-mode macro base station – ZXSDR BS8800

n Size: main cabinet 950×600×450 mm

extension cabinet 700×600×450 mm

n Weight: main cabinet ≤ 150Kg

extension cabinet ≤ 130Kg

n Power: S12/12/12: 1335W

S6/6/6: 825W

n Input voltage: -48VDC (-40~ -57VDC)

n Transmission mode: the Abis interface supports 8 E1/T1 links

and 1 GE port.

The structure of ZXSDR BS8800

n BBU: baseband unit, which is the same with B8200.

It can contain at most 2 sets of BBU.

n _{RU60: GU dual mode RF unit. The core part is the same with that of}

R8860. It supports 6 GSM carriers or 3 UMTS cells or GU dual-mode configuration. Cabinet-top transmitting power is 60W.

n RU80: GU dual mode RU unit. It is an upgraded version based on

RU60. Cabinet-top transmitting power is 80W.

n BS8800 is developed on ZTE’s unified platform. The rack

includes the physical cabinet, PDM unit and FAN unit.

n BBU and the RU modules all adopt － 48V DC power supply. n All of the RU modules have the same size and outline.

n The fan rotation speed can be adjusted by the software

according to different heat discharge requirements for

different RU modules, thus to lower down noises and achieve energy efficient.

n BS8800 has been used in the products of the three radio

modes, such as GSM, CDMA and UMTS.

n Size: 1700×600×600 mm

n Weight: ≤ 263Kg

n Power: S12/12/12: 1886W

S6/6/6: 1261W

n Input voltage: -48VDC (-40~ -57VDC)

n Transmission mode: the Abis interface supports 8 E1/T1 links

and 1 GE port.

n Maximum site configuration: S12/12/12 or O36

Media plane of the SDR

n The media plane supports transmission by the RTP(Real Time )

protocol

n _{The UBPG of SDR and the BIPB of iBSC process RTP data of the}

user plane.

n CC is responsible for forwarding messages inside the BBU and over

内部公开 Internal Only▲

Contents

Basic Concepts of SDR

Structure of SDR Base Stations

Introduction to BBU

Introduction to RU/RRU

Hardware – structure

n Cabinet

- 19 inch - 2U

n Flexible installation mode

- Mounted on the wall independently

- 19 inch standard cabinet - Installed in the Hub

cabinet

- Installed in the outdoor cabinet 15 4 8 FA 3 7 14 2 6 13 _{1 5}

Hardware – boards

n Control and clock module (CC)- location 1 or 2

n Fabric switching module (FS)-interface between BBU and RRU 3 or 4 slot

n Site alarm module (SA)-8 E1/T1 interface, alarm

n Baseband processing board (BPC/UBPG)-different mode choose different card

n Fan array module (FA)

n Power module (PM)

Hardware – interfaces

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E1: supports 16 E1/T1 links at most

l

GE: there are two GE interfaces. One is photo-electric

exclusively, and the other is electric.

l

CPRI: One FS has 6 CPRI interfaces. There are two FS

at most, hence there are 12 CRPI interfaces at most.

l

GPS ： 1

CPRI

GE

E1 GE

Hardware function module – CC

n Integrate such functions as main control, clock, switching and the

Iub/Abis interface

n _{Physically, the CC does not provide the E1/T1 interface. It connects}

E1/T1 to the SA through the backplane of BBU, and the SA provides the E1/T1 interface.

n _{Support the master/slave mode} n _{Full IP transmission}

n _{CC0: It supports internal or external GPS, clock cascaded connection,}

and 16 E1 links. It does not support 2MBits clock.

n CC2: It does not support internal or external GPS and clock cascaded

Hardware function module – FS

n It supports the master/slave mode and the load sharing function.

n The slot for FS is also compatible for the baseband board.

n 6 1.25G CPRI optical ports, which support 24TRX (GSM) or

4CS (WCDMA) each.

n It does not support master/slave switchover.

n For GU dual mode N+6×M<=24 (N represents number of TRXs,

Hardware function module – SA/SE

n Environment monitoring module

n Fan monitor

n SA: support 8 channels of E1/T1 signals, 1 RS232 serial port or

1 RS485 interface, 6 input dry contact alarm, and 2 double-directional dry contact alarm

n SE: support 8 channels of E1/T1 signals, 1 RS232 serial port or

1 RS485 interface, 6 input dry contact alarm, and 2 double-directional dry contact alarm

Hardware function module – UBPG

n GSM baseband processing module

n Responsible for baseband modulation. Downlink: processing up

to 12 carriers, speed adaption, channel coding and interleaving, encryption; producing TDMA burst pulse, GMSK/8PSK

modulation; outputting IQ baseband digital signals; sending

power and frequency control information to RRU for processing.

n Responsible for baseband modulation. Uplink: process up to 12

carriers; after receiving IQ baseband data from RRU, perform diversity combination for the receiver, digital demodulation (GMSK and 8PSK demodulation, balance), decryption,

de-interleaving, channel decoding and speed adaption, and then sends to the CC board through the Ethernet port.

Hardware function module – FA

n Fan monitoring module

n Power supply, rotation control and status report

Hardware function module – PM

n A single PM provides 16 12V-power supply, which can meet the

power supply requirement of B8200 in full configuration.

BBU configuration rules

Board Configurations

Power module (PM) 1 PM is configured by default. Decide whether it is necessary to configure 2 PMs according to the requirement for reliability and cost. Site alarm module (SA) 1 SA is configured by default.

Control and clock module (CC) 1 CC is configured by default. Select either CC0 or CC2 according to the clock and E1. Decide whether it is necessary to configure 2 CCs according to the requirement for reliability and cost.

Fabric switch module (FS) Generally, 1 FS is configured, and 2 FSs at most. The quantity depends on site configuration.

Universal baseband processing

board for GSM (UBPG) The quantity depends on site configuration. _{The slots are compatible for both the BPC and the UBPG.} Baseband processing board type

C (BPC)

The quantity depends on site configuration.

The slots are compatible for both the BPC and the UBPG. Fan array module (FA) 1 FA only is configured

Site alarm extension board (SE) Optional, which depends on the quantity of dry contacts. It is inserted at Slot 5.

内部公开 Internal Only▲

Contents

Basic Concepts of SDR

Structure of SDR Base Stations

Introduction to BBU

Introduction to RU/RRU

Multi-carrier RU/RRU (1)

n The multi-carrier RF modules include three types:

RU60 (60W) , R8860 (60W), and RU80 (80W).

n RU/RRU uses multi-carrier technology. IT performs

signal synthesis for multiple carriers. It uses only one set of boards and PA, and one set of antenna system. RU60 supports signal synthesis for 6

carriers.

n The RU/RRU module has only two external

antenna ports. It supports single-transmitting and double receiving generally. If the cell has over 6 carriers, one port should be reserved to connect the other RU.

n RU/RRU adopts broadband transceiver and

Multi-carrier RU/RRU (2)

n RU/RRU is responsible for functions of the baseband RF

interface and the Uu/Um interface.

n _{RU/RRU is responsible for access and radio link}

transmission of UE/MS through the Uu/Um interface, including RF processing, modulation/demodulation, measurement and report, power control, receiving diversity, correction, synchronization, etc.

n It connects to BBU through the optical interface by the

CPRI protocol. It implements the following functions through the optical interface, such as IQ data

transmission, measurement report, RF function configuration, clock synchronization, etc.

Multi-carrier RU/RRU (3)

n R8840: 2100M UMTS single mode, cabinet-top transmitting

power: 60w, supporting 4CS (actually, 3CSs are configured to meet the requirement of 20w/CS.)

n R8860: support 850M/900MGU dual-mode or 1800M/1900M

single mode. Cabinet top: 80w (GMSK), supporting 24TRX or 4CS or 2W+2G or 1W+4G

n R8880: 2100M UMTS single mode; cabinet-top output power:

Multi-carrier RU/RRU (4)

n R8840: support -48VDC, 110VAC, 220VAC

n R8860: support -48VDC. It does not support AC power supply

Contents

Basic Concepts of SDR

Structure of SDR Base Stations

Introduction to BBU

Introduction to RU/RRU

Fiber interfaces

n Each FS board supports 6 fiber interfaces.

n Each RU supports 2 fiber interfaces.

High integration

n Uppg support 12 Carrier

n RU supports 6TRX.

n A fiber can support 24 TRX, incase of cascading mode.

n Support smooth evolution to LTE and HSPA+

n All IP transmission based structure

Flexible structure

n Support macro-base station

n Support remote RU

n Support both FE/GE and E1/T1

n Support both indoor and outdoor requirements

n Small volume and light weight

n Energy efficient

Review

n

Basic concepts of SDR

n

SDR hardware and software structure

3 types of SDR base stations

n

Functions of each SDR board

Various interface of SDR