zte sdr

Internal Only▲

Introduction to GU SDR Base Stations

GU Product Support Dept.

Internal Only▲

04/08/2023 2

Purpose

04/08/2023 2

You are expected to master the following knowledge after this course

basic concepts and structure of SDR

Types of SDR base stations

SDR hardware boards

Interfaces of SDR base stations

内部公开 Internal Only▲

Contents

Basic Concepts of SDRStructure of SDR Base StationsIntroduction to BBUIntroduction to RU/RRUIntroduction to Interface between BBU and RU/RRU

Internal Only▲

What is SDR SDR- Software Defined Radio


Contents

Basic concepts of SDRStructure of SDR Base StationsIntroduction to BBUIntroduction to RU/RRUIntroduction to Interface between BBU and RU/RRU

Internal Only▲

SDR technology brings changes to base station structure

Significant feature of the SDR – software defined radio mode

1 The RF front end processes signals of multiple radio modes

2 Baseband processes signalsof multiple radio modes

3 Software integration to unify software versions

SDR technology– the system supports multiple radio modes

Internal Only▲

Structure of ZTE SDR base station Support the distributed structure of BBU and RRU. For

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

Multi-mode RF platform Adopt IP technology to process internal data stream of the base

station OMC platform——OMCR and OMCB 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.

Internal Only▲

ANT

Transceiver

Front end of Rx

Duplex

Multi-carrier PA

External power PWS 220VAC

RRU/RU

BBU

Resource control board

BBU baseband poolFiber

SDR product structure

Internal Only▲

Connection of different components of BBU

Internal Only▲

SDR product architecture

Distributed base station: RF is distributed remotely

RRU

BBU

Internal Only▲

SDR product architecture

Macro base station: BBU and RU are all in the cabinet, which is different from the distributed base station in structure.

Internal Only▲Advantage 1 of the SDR architecture – BBU and RRU can be distributed separately

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.

The networking is flexible if the RRU is distributed remotely. For example, it can support multi-carrier and indoor distributed coverage.

BBU and RRU can be distributed flexibly, which benefit for compatibility design.

Internal Only▲

Advantage 2 of the SDR architecture – baseband hardware

Support multiple radio modes Simple design Powerful processing capability Easy to manage Easy to share resources Cut cost Easy for evolution of baseband technologies

Internal Only▲

Advantage 3 of the SDR architecture – independent RF unit

Simplified functions Improved reliability, easy for maintenance Improved the efficiency of the power amplifier Optimized heat design, easy for integration Closer to antenna, hence bigger power Flexible forms of RU/RRU products Help to reduce the size and weight of base stations Cut cost

Internal Only▲

Advantage 4 of the SDR architecture – unified interface between BBU and RU/RRU

The interface between BBU and RU/RRU is the exclusive interface for communication between BBU and RU/RRU .

The interface between BBU and RU/RRU supports such radio modes as GSM, WCDMA etc.

Support fiber interface and electrical interface Support 1.2288Gbps and 2.4576Gbps rate Support both star-type and link-type networking between BBU

and RU/RRU Support RU/RRU cascading-connection RRU can be distributed remotely. BBU can be kept 40 km away

from RRU.

Internal Only▲

Distributed base station: B8200 ＋ R8860

B8200: powerful BBU Support both GSM and WCDMA. 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

RF

MS

Um interface

CPRI

Fiber

Internal Only▲

Indoor dual-mode macro base station – ZXSDR BS8800 Size: main cabinet 950×600×450 mm

extension cabinet 700×600×450 mm Weight: main cabinet ≤ 150Kg

extension cabinet ≤ 130Kg Power: S12/12/12: 1335W

S6/6/6: 825W Input voltage: -48VDC (-40~ -57VDC) Transmission mode: the Abis interface supports 8 E1/T1 links

and 1 GE port. Maximum site configuration: S12/12/12 or O36

Internal Only▲

The structure of ZXSDR BS8800

Main cabinet

1650mm

450 mm

600mm

PDMCabling trough

Baseband

950mm

PDM

Cabling trough

RF unit

Extension cabinet Fan

RU unit

Heat discharge unitVentilation hole

Heat discharge unitVentilation hole

Internal Only▲

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

It can contain at most 2 sets of BBU.

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.

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

RU60. Cabinet-top transmitting power is 80W.

Indoor dual mode macro base station – ZXSDR BS8800

Internal Only▲

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

includes the physical cabinet, PDM unit and FAN unit.

BBU and the RU modules all adopt － 48V DC power supply.

All of the RU modules have the same size and outline.

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.

BS8800 has been used in the products of the three radio

modes, such as GSM, CDMA and UMTS.

Indoor dual mode macro base station – ZXSDR BS8800

Internal Only▲

Size: 1700×600×600 mm

Weight: ≤ 263Kg

Power: S12/12/12: 1886W

S6/6/6: 1261W

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

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

and 1 GE port.

Maximum site configuration: S12/12/12 or O36

Outdoor dual mode macro base station –ZXSDR BS8900

Internal Only▲

Media plane of the SDR

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

The UBPG of SDR and the BIPB of iBSC process RTP data of the user plane.

CC is responsible for forwarding messages inside the BBU and over the Abis interface.

CC

UBPGRRU FS iBSC

Forwarding

RTP


Contents


Internal Only▲

Hardware – structure

Cabinet - 19 inch - 2U Flexible installation mode - Mounted on the wall

independently - 19 inch standard cabinet - Installed in the Hub cabinet - Installed in the outdoor

cabinet

154 8

FA3 7

142 6

13 1 5

Internal Only▲

Hardware – boards Control and clock module (CC)- location 1 or 2

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

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

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

Fan array module (FA) Power module (PM) Backplane board (BB)- operating and power mode, CC management through BB.

Internal Only▲

Hardware – interfaces E1: supports 16 E1/T1 links at most GE: there are two GE interfaces. One is photo-electric

exclusively, and the other is electric. CPRI: One FS has 6 CPRI interfaces. There are two FS

at most, hence there are 12 CRPI interfaces at most. GPS ： 1

CPRI

GE E1 GE

GPS

Internal Only▲

Hardware function module – CC Integrate such functions as main control, clock, switching and the

Iub/Abis interface 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.

Support the master/slave mode Full IP transmission CC0: It supports internal or external GPS, clock cascaded connection,

and 16 E1 links. It does not support 2MBits clock. CC2: It does not support internal or external GPS and clock cascaded

connection. It supports 2MBits clock and 8 E1 links.

Internal Only▲

Hardware function module – FS It supports the master/slave mode and the load sharing function. The slot for FS is also compatible for the baseband board. 6 1.25G CPRI optical ports, which support 24TRX (GSM) or

4CS (WCDMA) each. It does not support master/slave switchover. For GU dual mode N+6×M<=24 (N represents number of TRXs,

and M represents number of CSs)

Internal Only▲

Hardware function module – SA/SE Environment monitoring module Fan monitor 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

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

Internal Only▲

Hardware function module – UBPG GSM baseband processing module 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.

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.

Internal Only▲

Hardware function module – FA Fan monitoring module Power supply, rotation control and status report LEDs on the fan subrack

Internal Only▲

Hardware function module – PM A single PM provides 16 12V-power supply, which can meet the

power supply requirement of B8200 in full configuration. Two PMs working in master/slave mode

Internal Only▲

Hardware function module – backplane

Internal Only▲

BBU configuration rules

Board ConfigurationsPower 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.


Contents


Internal Only▲

Multi-carrier RU/RRU (1) The multi-carrier RF modules include three types:

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

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.

RU/RRU adopts broadband transceiver and broadband power amplifier.

Internal Only▲

Multi-carrier RU/RRU (2) RU/RRU is responsible for functions of the baseband RF

interface and the Uu/Um interface. 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.

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.

906 for GSM 900 & 186 for GSM 1800


Contents


Internal Only▲

Fiber interfaces

Each FS board supports 6 fiber interfaces.

Each RU supports 2 fiber interfaces.

BBU is at most 40 Km away from the RU.

Internal Only▲

High integration

Uppg support 12 Carrier RU supports 6TRX. A fiber can support 24 TRX, incase of cascading mode. Support smooth evolution to LTE and HSPA+ All IP transmission based structure Support multi-band RRU

Internal Only▲

Flexible structure

Support macro-base station Support remote RU Support both FE/GE and E1/T1 Support both indoor and outdoor requirements Small volume and light weight Energy efficient Support evolution of the technology

Internal Only▲

Review

Basic concepts of SDR SDR hardware and software structure 3 types of SDR base stations Functions of each SDR board Various interface of SDR

zte sdr

Documents

distributed

sdr product

sdr base stations

maximum site

top transmitting

multiple radio

clock cascaded

radio modes