motorola bss operational theory222222222222

7/30/2019 Motorola BSS Operational Theory222222222222

1/23


2/23

MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or servicenames are the property of their respective owners. Motorola, Inc. 2004.

2

GSM Network Components

Mobile Station (MS)

Network Switching System (NSS)

Base Station System (BSS)

Which consists of three major hardware components:

The Transcoder (XCDR)

The Base Station Controller (BSC)

The Base Transceiver Station (BTS)


3/23


3

Base Station System (BSS)


4/23


4

Transcoder (XCDR)

Transcoder (XCDR)

This converts the information from 64kbit/s PCM into 13kbit/sGSM defined speech.

Divided into Three Areas

Interfacing

Trans coding Switching


5/23


5

Transcoder FunctionalRequirements


6/23


6

Base Station Controller (BSC)

BSCThe BSC provides overall Base Station System control. Being atthe centre of the BSS it

provides connectivity between the MSC and a number of BTSs.

Divided into Two Areas

Interfacing

Switching


7/23MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or servicenames are the property of their respective owners. Motorola, Inc. 2004.

7

BSC Functional Requirements



8

Base Transceiver Station (BTS)

BTSThe BTS provides the Base Station System with the radio link via

which the MS communicates with the network.

Divided into Three Areas

Interfacing

Switching

RF Equipment



9

BTS Functional Requirements



10

Base Station System Controller(BSSC) Cabinet Operational


11/23


11

BSSC Configuration

A BSSC cabinet can be configured as:

A Base Station Controller (BSC) containing digital hardwaremodules configured to control the radio subsystem.

A Remote Transcoder (RXCDR) containing digital hardware

modules configured to provide an interface between theBSC and Mobile Switching Centre (MSC).

A combination of the BSC and RXCDR functions.

The difference between the BSC and RXCDR configurations is inthe complement of digital modules on the backplane.


12/23


12

BSSC2 Cabinet External View


13/23


13

BSSC2 Internal View


14/23


14

General View


15/23


15

BSSC Cabinet InternalComponents

The internal components of the BSSC cabinet include thefollowing:

BSU / RXU Shelf (up to two per cabinet)

Half size modules

Full size cards

Power Supply Modules

Cooling Fans

Power Distribution Board

Distribution Alarm Board


16/23


16

BSSC Cabinet Configurations


17/23


17

BSSC Cabinet InternalComponents


18/23


18

Shelf Internal ConnectionsOverview

To process all the data required to make and maintain the call, eachsoftware process and therefore digital card must be able tocommunicate which each other and to any external entities such asthe MSC or BTS. Each card has one or more connections to one ormore data buses to co-ordinate this data transfer. Each bus hasdiffering functions

Buses can be summarized as below

Time Division Multiplexed (TDM) highway

Motorola Cellular Advanced Processor (MCAP) bus

Local Area Network (LAN) Serial bus


19/23


19

Shelf Interconnections Overview


20/23


20

Base Station Unit (BSU)

Max numbers of Full Size Boards Contained within the BSU.

2 x Kiloport Switch (KSW)

12 x Multiport Serial Interface (MSI)

2 x Generic Clock (GCLK)

8 x Generic Processor (GPROC)

6 x Full-Rate Transcoder (XCDR)

6 x Generic DSP Processor (GDP)2 x Bus Terminator Card (BTC)

Max numbers of Half Size Boards Contained within the BSU18 x Kiloport Switch Extender (KSWX)

6 x Clock Extender (CLKX)2 x Local Area Network Extender (LANX)

2 x Parallel Interface Extender (PIX)

3 x Battery Backup Board (BBBX)


21/23


21

BSU Shelf Module Layout


22/23


22

Remote Transcoder Unit (RXU)

Max numbers of Full Size Boards Contained within the RXU.

2 x Kiloport Switch (KSW)6 x Multiport Serial Interface (MSI)

2 x Generic Clock (GCLK)

2 x Generic Processor (GPROC)

16 x Full-Rate Transcoder (XCDR)

16 x Generic DSP Processor (GDP)

2 x Bus Terminator Card (BTC)

Max numbers of Half Size Boards Contained within the RXU

18 x Kiloport Switch Extender (KSWX)

6 x Clock Extender (CLKX)

2 x Local Area Network Extender (LANX)2 x Parallel Interface Extender (PIX)

3 x Battery Backup Board (BBBX)


23/23

MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office All other product or service 23

RXU Shelf Module Layout

motorola bss operational theory222222222222

Documents