PCU Architecture & Technical Presentation

8/10/2019 PCU Architecture & Technical Presentation

1/23

GPRS WorkshopMotorola Confidential Proprietary

External connection


2/23



3/23


GPRS Impact

Will GPRS impact my GSM network?

Will I need more Radio Carriers?

Which software features will Motorola incorporate to help

me with the GPRS implementation?


4/23


Single carrier site

Single carrier site

BCCH + 7 TCH TS

2.8 Erl.

Rural areas

Towns

In-Building, Corporations


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Timeslot sharing

BTS

BCCH GPRS GPRS GPRSTCHTCH TCH

User rate atCS2 = 40.2 kbps

TCH

A Voice call require the GPRS TS

Site with one carrier will be able to share time slots (Voice and GPRS)


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Timeslot sharing

BTS

BCCH GPRS GPRSTCH TCH TCHTCH


TCH

A Voice call takes the GPRS TS


Site with one carrier will be able to share timeslots (Voice and GPRS)

The first GPRS service will not require additional radios


7/23GPRS WorkshopMotorola Confidential Proprietary

High Density Traffic

European City

Medium to High

traffic load

City centre with

3/3/3 or 4/4/4

80 Erls/Km2

Cell Radius =

200 meters



How to guarantee quality of service in a real network

Voice

Data

Channel sharing

GPRS GPRSS S S SS S

BCCH TCH TCH TCH TCH TCH TCH TCH BCCH

TCH

Two Carrier

Cell

Guaranteed GPRS

Bandwidth



How to Guarantee quality of service in a real network

Voice

Data

Channel sharing

S S S S

TCH TCH TCH TCH TCH TCH TCH TCH TCH 1

TCH 2

Three Carrier

Cell

The first GPRS servicemight not require to add

more DRCU

BCCH TCH TCH TCH TCH TCH TCH BCCHTCH

GPRS GPRS GPRS GPRS



Channel sharing

BTS

BCCH GPRS GPRS GPRS GPRS GPRS GPRS GPRSMAX

Bandwidth at

CS2 = 93.8 kbps

BTS

BCCH TCH TCH TCH TCH TCH TCH Bandwidth atCS2 = 13.4 kbps

GPRS

Dynamic allocation of channels between circuit and packet:



BSS Functionality

Includes the Base Site Controller (BSC), Base

Transceiver Station (BTS) and GPRS Packet Control

Unit (PCU)

Existing Radios will support GPRS without hardware

upgrades GPRS Features Will Be Added to the BSC and the BTS by

Software Upgrades

BTS Radios Will Support CS1 & CS2

BTS Radios Are Expected to Support CS3 & CS4 With a futureFirmware (Software) Upgrade

Like Circuited Switched, GPRS Features Are Managed

From the OMC-R



PCU performs new GPRS air functions

PCU manages Gb interface and performs Frame Relay

PCU is new hardware and new software

PCU manages new hardware devices

(Note that A-interface is not used for GPRS)

PCUE1

(TRAU)E1

(Frame

Relay)

To SGSN(packet switch)

Air

Interface Gb Interface

Motorola

Abis

Interface

E1

(TRAU)

BTS BSC

GPRS Hardware Architecture



Main

card

area,

front

access

Power input module

Alarm Board

Fan Assembly

PSU positioned behind

Fan assemblies

19in rack mountable

Common Hardware PlatformGSN & PCU

Robust, Industry Standard Hardware PlatformCompactPCI

Standard Chassis: Rack Mountable

Specifies Cage, Power Supplies, Processor Cards, Plug-in Modules,

Physical Interface Modules

Hot Swappable Modules

Highly Scaleable, Shelves Interconnectable in a Frame

cPCI Hardware



PCU architecture



PCU Hardware Architecture

Compact-PCI based

MPROC: Master Processor (System) board

PPB: PCI to PCI Bridge board

DPROC: Data Processor board

16151413121110987654321

Left PCI

Bus

Right PCI

Bus

DPROC

DPROC

DPROC

DPROC

DPROC

DPROC

DPROC

MPROC

MPROC

PPB

PPB

DPROC

DPROC

DPROC

DPROC

DPROC



PMC Board

PMC Board

PMC boardfront panel

Cables are

plugged ito

transitions

modes

PCI Mezzanine Card (PMC) Board

Location



PCU Capacity

GPRS will be supported on all

Motorola BTS platforms

1:1 PCU to BSC

PCU to BSC: max 9 E1s

Manages up to 1080 RF

Timeslots

Interface with the SGSNthroughout the Gb interface



BSC Enclosure

PCU Module

( 16 Slot cPCI Modules

MCG CPX8216 )

High level cable accessthrough enclosure top panels

Enclosure DimensionsHeight = 1900mm

Width = 600mm

Depth = 650mm

PCU Enclosure

Space for additional

PCU Modules

Low level cable access

through enclosure base

PCU System Hardware



BSC Enclosure

PCU Modules

( 16 Slot cPCI Modules

MCG CPX8216 )

High level cable accessthrough enclosure top panels

Enclosure Dimensions

Height = 1900mm

Width = 600mm

Depth = 675mm

PCU Enclosure

Low level cable access

through enclosure base

PCU Site Layout



SS SVV S SSSS RVV S SS

V = Voice Reserved

S = Switching (Voice or GPRS)

R = Reserved GPRS

Card Level Capacities

30 Timeslots (Capacity)

402 kbps at CS2

120 Timeslots (Coverage)

Last Shared

TS FeatureApplies Capacity to Cells

Allocates Radio Timeslots

Provides Fault Tolerance

-- Cells -- Cell

(Carrier)

Cell

(Carrier)Dynamic

Allocation

Feature

Load Balancing

Feature

Cell Balancing

Feature

PCU

BSS Timeslot Management

Features



A single Frame - Timeslots are All Idle

Cell B Cell CCell ACell D Cell E

4 Active Timeslots

In this example we have resources for 4 active timeslots

and 16 Inactive Timeslots

The Acrive Resources are used where they are needed.

Time

Active and Standby Timeslots


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How to Configure the PCU

Simple Rules

1 - Compact PCI Shelf Cabinet

1 - 16 Slot Compact PCI Shelf

1 - MPROC Compact PCI Board

1 - Bridge Board 2 - Packet Interface Control Processor Boards

1 - 9 Packet Resource Processor Boards

Equation:

PICP = Total Active Timeslots / 30

(Note: always round up)

An extra board may be added for redundancy


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GPRS W k hM t l C fid ti l P i t

Thank you

Documents

PCU Architecture & Technical Presentation