ECATS and EPUMA BB-RF interface training

Part I

BTS and Transceiver basics

Table of contents• The material is split into the following sections

– Part 1: BTS and Transceiver basics– Part 2: Base Band Module runtime operation– Part 3: Base Band Module initialization (Initialization from UC

SW point of view)– Part 4: RFM (Radio Frequency Module) in runtime operation– Part 5: RFM initialization (from UC SW point of view)– Part 6: RFM initialization, calibration parameters and calibration

EEPROM– Part 7: TRX timing– Part 8: TRX Alarms handling – Part 9: TRX test loops– Part 10: Mixed CATS/ECATS and PUMA/EPUMA configurations

BTS functions

• BTS adapts the transmission (Abis) signal to air interface (like a modem)• BTS receives the data to be transmitted and control data from BSC • The received data from MS and BTS status/alarm information is sent to BSC

through Abis • Signal flowing towards MS is referred as DL and signal from MS towards

BSC is referred UL in all interfaces, but specially the interface between BBB and RFM is referred with DL and UL

BSC

BTS

TR

AN

SM

ISS

ION

PA

RT

S

BA

SE

BA

ND

P

AR

TS

RF

PA

RT

S

ANTENNA

DL

ULD

-BU

S

Abis

MS

TRX units

CATS / ECATS BTSPower supply unit

Interface unit

Transmission unit

Transceiver units

Fan unit

• Maximum 4 TRX units, dualband, triband and mixed configurations supported, CATS/HPCATS/ECATS...

• Interface unit supports chaining of BTS's. The BTS oven oscillator is in interface unit

• Transmission unit connects the BTS to BSC, several options oftransmission supported - fixed (terrestrial) and radio links

• Fan unit on the bottom is controlled by the cabinet master (O&M) TRX, smooth temperature control without thermal transients

• Transmission, interface and TRX units have heating elements which are also controlled by the O&M TRX

PUMA/EPUMA BTS . • Power supplies (PSU) and transmission

units similar to CATS/ECATS• TRX unit is split to separate BB (BB2) and

RF units• BOI unit is a multiplexer, which makes

the cross-connection between BB2 and RF units (And it is also the O&M unit of the BTS without own RF parts)

• In the example drawing, the bottom half of the cabinet is filled with battery back-up units, but in normal configuration the cabinet can take up to 12 channel units (BB&RF)

1700 mm

BBAG

BBAG

BLO

PSU

BB2 units of TRX

BOI

TransmissionunitsRF units ofTRX

TRX Unit• Slightly simplified TRX

unit is a box which you plug into Base Station mechanical framework

• The tranceiver functions need one base band module/unit and one RF module/unit

• The base band and RF parts are described in later parts of the material...

ECATS TRX = 1 box

EPUMA TRX = 1 RF unit + 1 BB unit

(more precisely 0.5 * BB as one

BB2 unit can interface two RF units)

TRX RF

BB2

BTS Buses (cabinet level)• D1 bus is the data bus

between transmission and all BB units of the BTS

• D2 bus connects the BB units together and enables fast SW loading from master to slaves

• Q1_int bus is the internal control bus between the BB of master TRX and transmission unit. It may be routed to all TRX units but only master (O&M)TRX uses it

• F-bus is base band hopping bus between TRX units in the same cabinet

BBB RFMDL

UL

D1

bus

D2

bus

BBB DL

UL

RFM

TRANSMISSION

BBB RFMDL

UL

MASTER TRX

SLAVE TRX

SLAVE TRX

Q1

bus

D1

Q1

F-b

us

BTS Buses (cabinet level)

• LMB is Local Management Bus

• Connecting through VIF front panel connector all TRX units and transmission unit can be accessed

• The I2C bus between all units is the cabinet I2C bus

• It is used by master TRX (O&M) to read version/serial number info and to control the FAN

RFM

BBB RFM

BBB RFM

MASTER TRX

SLAVE TRX

SLAVE TRX

LMB

I2C

LocalManagementTool

UART

I2CTRANSMISSION

VIF

EEPROM

EEPROM

EEPROM

EEPROM

FAN CTRL

PSU

FAN

Intelligent Back Plane

Supply cntrl

I2C

I2C

I2C

EEPROM