ZTE SDR

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Introduction to GU SDR Base Stations GU Product Support Dept. 单击此处编辑母版副标题样式

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Purpose l

1/17/13

You are expected to master the following knowledge after this course n

basic concepts and structure of SDR

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Types of SDR base stations

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SDR hardware boards

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Interfaces of SDR base stations

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Contents Basic Concepts of SDR Structure of SDR Base Stations Introduction to BBU Introduction to RU/RRU Introduction to Interface between BBU and RU/RRU

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What is SDR n

SDR- Software Defined Radio


Contents Basic concepts of SDR Structure of SDR Base Stations Introduction to BBU Introduction to RU/RRU Introduction to Interface between BBU and RU/RRU

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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

SDR technology – the system supports multiple radio modes

2 Baseband processes signals of multiple radio modes

3 Software integration to unify software versions

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Structure of ZTE SDR base station n

n n n n

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.

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SDR product structure

BBU baseband pool

Fiber Resource

Transceive r

carrier PA

Duplex

Front end of Rx

control board

BBU

ANT

RRU/ RU Multi-

External power

PWS

220VAC

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Connection of different components of BBU

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SDR product architecture n

Distributed base station: RF is distributed remotely

RRU

BB U

SDR product architecture n

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

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. 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 for compatibility design. n

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Advantage 2 of the SDR architecture – baseband hardware n n n n n n n

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

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Advantage 3 of the SDR architecture – independent RF unit n n n n n n n n

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

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

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.

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Distributed base station: B8200 ＋ R8860 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. n

R F

CPRI

Um interface

Fiber ZXSDR BBU

ZXSDR RRU

MS

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Indoor dual-mode macro base station – ZXSDR BS8800 n n n n n n

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

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The structure of ZXSDR BS8800 RU unit

Cabling trough Heat discharge unit Ventilation hole

Extension cabinet

PDM

1650m m

Fan

RF unit

Cabling trough 950m m

PDM Heat discharge unit Ventilation hole

450 mm Baseband

Main cabinet

600mm

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Indoor dual mode macro base station – ZXSDR BS8800 n

BBU: baseband unit, which is the same with B8200. It can contain at most 2 sets of BBU.

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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.

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RU80: GU dual mode RU unit. It is an upgraded version based on RU60. Cabinet-top transmitting power is 80W.

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Indoor dual mode macro base station – ZXSDR BS8800 n

BS8800 is developed on ZTE’s unified platform. The rack includes the physical cabinet, PDM unit and FAN unit.

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

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

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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.

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BS8800 has been used in the products of the three radio modes, such as GSM, CDMA and UMTS.

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Outdoor dual mode macro base station –ZXSDR BS8900 n

Size: 1700×600×600 mm

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Weight: ≤ 263Kg

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Power: S12/12/12: 1886W S6/6/6: 1261W

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

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Transmission mode: the Abis interface supports 8 E1/T1 links and 1 GE port.

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Maximum site configuration: S12/12/12 or O36

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Media plane of the SDR n n n

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.



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Hardware – structure 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 n

15 14 13

4

8

3

7

2

6

1

5

FA

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Hardware – boards n n n n n n n

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.

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Hardware – interfaces l l l l

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

E1

GPS

GE

GE

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Hardware function module – CC n n

n n n n

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.

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Hardware function module – FS n n n n n

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)

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Hardware function module – SA/SE 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 doubledirectional 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 doubledirectional dry contact alarm n

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Hardware function module – UBPG 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, deinterleaving, channel decoding and speed adaption, and then sends to the CC board through the Ethernet port. n

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

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Hardware function module – PM A single PM provides 16 12V-power supply, which can meet the power supply requirement of B8200 in full configuration. n Two PMs working in master/slave mode n

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Hardware function module – backplane

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



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Multi-carrier RU/RRU (1) n n

n

n

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.

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Multi-carrier RU/RRU (2) 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. n 906 for GSM 900 & 186 for GSM 1800 n

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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

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R8880: 2100M UMTS single mode; cabinet-top output power: 2×60w, supporting MIMO (2T2R) and 4CS

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Multi-carrier RU/RRU (4) n

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

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

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R8880: support -48VDC, 110VAC, 220VAC



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Fiber interfaces n

Each FS board supports 6 fiber interfaces.

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Each RU supports 2 fiber interfaces.

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BBU is at most 40 Km away from the RU.

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High integration n n n n n n

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

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Flexible structure n n n n n n n

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

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Review n n n n n

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

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