Hyundai Electronics Co PIC800 User Manual

PICO-BTS

PICO-BTS EQUIPMENT

PICO-BTS PICO-BTS

DESCRIPTION

DESCRIPTIONDESCRIPTION

(800MHZ CELLULAR BANDS)

EQUIPMENT

EQUIPMENTEQUIPMENT

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Table of Contents

1. INTRODUCTION

1.1 Scope 8

1.2 Applicable Documents and Standards 8

2. SPECIFICATIONS

2.1 Functional Specifications 8

2.1.1 Operating Frequency 8

2.1.2 Interface Specification 8

2.1.3 Operational and Maintenance 9

2.1.4 Configuration Features 9

2.2 Performance Specification 9

2.2.1 System Delay 9

2.2.2 Capacity 10

2.3 Electrical Performance 10

2.3.1 Transmitter RF Power 10

2.3.2 Electric Power 10

2.4 Physical Specifications 11

2.5 Environmental Specifications 11

2.6 Reliability Specifications 11

2.6.1 MTBF 11

2.6.2 Battery Backup time 11

2.6.3 Quality Materials 11

2.6.4 Grounding Requirements 11

2.6.5 Alarm Requirements 11

3. SYSTEM DESCRIPTI ON

3.1 System Functionality 12

3.1.1 Configuration 12

3.1.2 Initialization 12

3.1.3 Call Control 12

3.1.4 Maintenance and Administration 13

3.1.5 Network Operation 13

3.2 System Architecture 14

3.2.1 Functional Architecture 14

3.3 System Interface 16

3.3.1 External Interface 16

3.4 System Availability, Mainte nance, and Environme ntal Enhancement 16

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3.4.1 System Availability 16

3.4.2 System Maintenance 16

3.4.3 Environmental Enhancement 16

3.5 Pico BTS Block Condiguration 17

3.5.1 Baseband Unit (BBU) 17

3.5.2 RF Unit (RFU) 18

4. HARDWARE STRUCTURE AND FUNCT IONS

4.1 RF Subsystem 19

4.1.1 Functionality 19

4.1.2 Architecture 20

4.2 Pico Baseband Digital Card (BDC) 24

4.2.1 Functionality 24

4.3 Pico BTS Control Processor Card (BCPC) 24

4.4 BTS Baseband Analog Card(BAC) 25

4.5 GPS Receiver Processor (GPRP) 26

4.6 Power Supplies (ACDC, BBDC) 26

4.7 Mechanical

4.7.1 Background 27

4.7.2 Mechanical Characteristics / Requirements 27

4.7.3 Thermal and Environmental Characteristics / Requirements 27

4.7.4 Design Strategies 27

/ Thermal Design 27

5. SOFTWARE DESCRIPTIONS

5.1 Pico BTS Control Processor Card (BCPC) 28

5.1.1 Functional Overview 28

5.1.2 BCPC Boot Software (pBCPCb) 29

5.1.3 BCPC Software Architecture Overview 29

5.1.4 Interfaces 30

5.1.5 Software Blocks 31

5.1.6 Interrupt Service Routines 40

5.2 B as e band Dig it al Car d (BDC) 40

5.2.1 Functional Overview 40

5.2.2 BDC Boot Software(pBDCb) 42

5.2.3 pBDCX Software Architectural Overview 43

5.2.4 Interfaces 43

5.2.5 Software Blocks 44

5.3 Inter Processor Communication (IPC) 45

5.4 Inter Module Communication (IMC) 46

5.4.1 Functional Overview 46

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5.4.2 Firmware 47

5.4.3 Software Architecture Overview 47

5.5 Backhaul Interface Handler (BIH) 48

5.5.1 Functional Overview 48

List of Figures

FIGURE.3.2-1 FUNCTIONAL ARCHITECTURE......................................................................................14

FIGURE 3.5.1-1 BASE BAND UNIT...........................................................................................................17

FIGURE 3.5.2-1 RF UNIT.............................................................................................................................18

FIGURE 4.1-1 HARDWARE FUNCTIONAL BLOCK DIAGRAM...........................................................19

FIGURE 4.1.2-1 RF SUBSYSTEM ARCHITECTURE................................................................................20

FIGURE 4.1.2-2.............................................................................................................................................21

FIGURE 4.1.2-3 TX FRONT END ARCHITECTURE................................................................................21

FIGURE 4.1.2-4 UP-CONVERTER BLOCK DIAGRAM ...........................................................................22

FIGURE 4.1.2-5 A DOWN-CONVERTER BLOCK DIAGRAM...............................................................23

FIGURE 4.2-1 MAJOR INTERFACES OF BDC .........................................................................................24

FIGURE 4.3-1................................................................................................................................................25

FIGURE 4.4-1 OVERALL FUNCTIONAL BLOCK DIAGRAM OF BAC...............................................26

FIGURE 4.6-1 FUNCTIONAL BLOCK DIAGRAM OF THE POWER SUPPLIES..................................27

FIGURE 5.1.3-1 BCPCSOFTWARE ARCHITECTURE.............................................................................30

FIGURE 5.1.5-1 BCM EXTERNAL INTERFACE DIAGRAM..................................................................31

FIGURE 5.1.5-2 PBRMX EXTERNAL INTERFACE DIAGRAM.............................................................33

FIGURE 5.1.5-3 PBSHX EXTERNAL INTERFACE DIAGRAM..............................................................34

FIGURE 5.1.5-4 PBTS DIAGNOSTICS EXTERNAL INTERFACE DIAGRAM......................................36

FIGURE 5.4.3-1 IMC SW ARCHITECTURE..............................................................................................47

FIGURE 5.4.3-2 BCPC IMC SOFTWARE ARCHITECTURE....................................................................47

List of Tables

TABLE 2.1.1-1 CELLULAR OPERATING FREQUENCY TABLE 2.2.1-1 BASE STATION DELAY BUDGET 10 TABLE 2.3.2-1 PRIMARY PO WER AC INPUT VOLTAGE RANGE REQUIREMENT 10 TABLE 2.3.2-2 MAXIMUM PRIMARY POWER OUTPUT REQUIREMENT 10 TABLE 2.3.2-3 BATTERY POWER REQUIREMENT 10 TABLE 2.4-1 PHYSICAL SPECIFICATIONS 11 TABLE 2.5-1 ENVIRONMENTAL SPECIFICATIONS 11 TABLE 3.2.1-1 16 TABLE 4.1.2-1 22

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Glossary

AC Alte rnate C u rre n t ACC Analog Common Circuit, replaced by BAC ACCA Analog Common Card Assembly ACE Access Channel El emen t ACRP Adjacent Channel Power Rejection ADC Analog To Digital AGC Automatic Gain Controller ANT Antenna BAC Baseband Analo g Circuit, replacing ACC BBU Base Band Unit BCP BTS Control Processor BC M BT S Co nf igu rat ion Management BCOX BTS Call Control Execution BDAX BCP Data Access Execution BDC Baseband Digital Card BDIAX BTS Diagnostic Executio n BDTU BT S Diag nostic & Tes t Unit BFMX BTS Fault Management E xecuti on BIH Backhaul Interface Handler - Software BIU Backhaul Interface Unit BMEA BCP Measurement BLINK BTS Link BPF Band Pass Filter BPLX BCP Processor Loader Execution BRAX BTS Resource Allo ca tion Execution BRMX BTS Reso u r ce Ma na gement E xe c ution BS Base St atio n BSC Base Station Controller BSHX BTS Status Handler Execution BSM Base S tatio n M anager BTS Base Transceiver System BW Band Widt h CAI Commo n Air Interface CCC Channel Card Common, replaced by CEC CCP Call Control Processor CDIAX CCP Diagnostic Execution CDMA Code Division Multiple Access CDMX C onfigur atio n Data M anagement Exe cut ion CE Channel Element CEC Channel Element Controller, replacing CCC CFMX C CP F ault Management Exec uti on CMEA CCP Measurement CPLX CCP Processor Loader Execution CRAX CCP Resourc e Allocatio n Execution CSHX CCP Status Handler Execution

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CSM Cell Site Modem DAC Digital to Analog Converter DC Direct Current DD Detailed Design DDS Direct Digital Synthesis DM Diagnostic Monitor DU Digital Unit EMI Electrical Magnetic Interface FA Frequency Allocation FIFO First-In -First-Out FPGA Field-Programmable-Gate_Array GPIO General Purpose Input / Output GPS G loba l Pos ition System HDLC Hi gh Leve l D ata Lin k Con trol HLD High Level Design IIn_Phase IF Intermediate Frequ ency IMC Inter Module Communication IMCB Inter Module Communication Bus IMCH Inter Module Communication Handler - Software IPC Inte r Pro c e s sor Communicati on LCIN Local CC P Interco nnection Network LED Light Emitting Diode LNA Low Noise Amplifier LO1 Local Os c illator 1 LO2 Local Os c illator 2 LPA Linear Power Amplifier LPF Low Pass Filter MFP Multi-Functio n Perip heral MLNK MSC Link MMI Man Machine Interface MRB Mo nitor/Report Block MS Mobile Station MSC Mobile Switch Center MSPS Mega Sample Per Se c o nd MTBF Mean Time Between Failure MUX Multiplexor MVIP Multiple Vendor Integrated Protocol OC Overload Controller OPAID Operation AID PA Power Amplifier PCI Peripheral Co mmunication Interface PCE Paging Channel Element PCS Personal Communicatio n System PN Pseudo-Noise Sequence PLD Program Load Data PLL Ph ase Lock Lo op PLX Process Loading Execution PP2S/ Pulse Pe r Two Sec ond PSCE Pilot_Sync Chan nel Element

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PSU Power Subsys te m Unit PSU Power Subsys te m Unit Q Quadrature RF Radio Frequency RFC Radio Frequency Controller RFFE RF Front End RFU Radio Frequency Unit ROM Read Only Memory RxFE Receiver Front End RxIF Receiver IF SCC Serial Communication Controller SIP Selector Interface Processor SNR Signal To Nois e Ratio SRAM Static Read O nly Memory SVE Selector Vocoder Element SVP Selector Vocoder Processor TBD To Be Determined T_BLK Te s t Block TC E Tra ffic Channel Element TDM Time Division Multiplexi ng TFC Time & Frequency Controller TxIF Transmitter IF TxFE Transmitter Fro nt End TFU Time and Frequency Unit TSB T ranscoder Selector Bank UART Universal Asynchronous Receiver Transmitter XCVC Radio Frequency Transceiver

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1. INTRODUCTION

1.1 Scope

This document describes the Pico Base Transceiver Station for CDMA cellular systems. The Pico-BTS provides the interface between the CDMA cellular mobile stations and the Base Station Controller (BSC) to form a Picocell. Picocells are used to enhance the coverage by covering the “dead spot” caused by shadowing in traditional “macrocell” based cellular networks. Also Picocells can be used to increase the capacity of the network as small underlay cells, providing more channels for traffic in dense urban areas with high volume of low speed traffic, such as malls, airports, train and subway stations, hotels, and office building areas.

1.2 Applicable Doc uments an d Stand ards

1. TIA/EIA/IS-95-A, Mobile Station-Base Station Compatibility Standard for Dual-ModeWideband Spread Spectrum Cellular System, May 1995.

2. TIA/EIA/IS-97-A, Minimum Performance Standards for Base Stations Supporting Dual-Mode Wideband Spread Spectrum Cellular Mobile Stations, June 1997.

3. EIA/TIA IS-634, MSC-BS Interface for Public Wireless Commu nications Systems

4. NEMA 4X

5. ANSI 6241 Class B

6. FCC Pa rt 15 fo r USA

7. FCC ICES-003 for Canada

8. FCC Part 22 in cellular band

9. FCC Part 68

10. FCC Part 2

11. TA-NWT-000487 R-127

12. TA-NWT-000063 R98

13. EIA/TIA IS-125, Recommended Minimum Performance Standard for Digital Cellular Wideband Spread Spectrum Speech Service Option 1.

14. EIA/TIA IS-126A, Mobile Station Loopback Service Option Standard

2. SPECIFICATIONS

The system requirements for the Pico-BTS are described in this chapter.

2.1 Functional Specifications

2.1.1 Operating Frequency

The Pico-BTS operates at frequencies specified in the following table.

Table 2.1.1-1 Operating Freque ncy

Unit Frequenc y Range (MHz)

Transmitter 869 - 894

Receiver 824 - 849

The Pico-BTS can cover all sub-bands only replacing the duplexer / BFP.

2.1.2 Interface Specification

2.1.2.1 Air Inter fa ce

The Pico BTS shall comply with EIA/TIA/IS-95-A.

2.1.2.2 Backhaul (A-bis ) In te rfa c e

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The interface between the Pico-BTS and the BSC, i.e., A-bis interface, shall comply with Hyundai’s CDMA Cellular BSC-BTS interface.

2.1.3 Operational and Maintenance

2.1.3.1 Oper ation/ Configurati on Management

The Pico-BTS is able to manage the data related to the operation and configuration of its subsystems. Some examples are as follows :

Initial loading

Radio resource management

hard ware conf igu rat ion data management

C DMA pa r ame ter manage ment

2.1.3.2 Perfor mance M anagement

The Pico-BTS is able to collect and analyze data related to the performance of the system, and send them to the appropriate higher level entity for manageme nt. Some examples are as follows:

Call proce ssing related parameters s tatis tic s colle c tion

Radio performance rela te d pa rameters s tatistic s collec tion

Periodic reporting

2.1.3.3 Ma int enanc e Ma nagement

The Pico-BTS is able to perform the detection, isolation, and restoration of elements operating abnormally. Some examples follow.

Fault detec tion and management

Alar m gener atio n and pro ce ss ing

Periodic test of maintenance/dia gnosis

St atus management

2.1.4 Configuration Features

The system supports one FA, omni-cell, or unidirectional sectored cell. It uses directional antenna to serve a sector.

A 3-sector cell site can be configured wit h 3 Pico-BTSs as primary equipment in each direction. When any sectors need more capacity , additional Pico BTSs can be stacked on each sector separately. Multiple Pico-BTS can be daisy-chained using one T1/E1 trunk to BSC.

The Pico BTS can serve as a stand-alone cell site, or it can be overlaid by another CDMA macro-cell.

Due to the small capacity of the Pico-BTS, the backhaul efficiency may be a concern from the economic point of view. In order to avoid this, multiple Pico BTSs shall be able to share a single backhaul transmission facility.

Any one of the channel elements may be configured to support one of the following:

◊ A pilot channel and a sync channel ◊ An access channel ◊ A paging channel

◊ A traffic channel

2.2 Performance Specification

2.2.1 System Delay

The total round-trip delay for the voice path, including the delay in the BSC, is less than 220 ms. A suggested delay budget for the reverse link path and the forward link path is as follows:

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Table 2.2.1-1 Base Station Delay Budget

Reverse Link De la y (ms) Forward Li nk Dela y (ms)

Mobile Station 51 Mobile Station 1 8

Air Link 20 Air Li nk 20

Digital Unit 18 Digital Unit 2

Backhaul/Switching 6 CIN 8

TSB 1 TSB 1

Vocoder 3 Vocoder 49

Total 99 Total 98

2.2.2 Capacity

The Pico BTS is capable of physically supporting up to 32 channel elements, including all of the overhead channels.

2.3 Electrical Performance

2.3. 1 Tran smitter RF Power

The maximum CDMA power does not exceed 10 watts at the antenna port on the enclosure over operating temperature range.

2.3.2 Electric Power

2.3.2.1 Primary Power The primary power source (or mains) for the Pico BTS is the commercial po wer which can be acquired very easily. The nominal voltage may be 120VAC, 60Hz, single phase. The power subsystem in the Pico BTS is capable of converting this commercial AC power into DC power with nominal voltage of +48V. The +48 DC is then converted into lower voltages s uch as +5V, +12V, -12V, +3.3V and +7.5V to be used in each subsystem. The AC input ranges and the maximum power source requirement are as follows:

Table 2.3.2-1 Primary Power AC Input Voltage Range Requirement

Nominal Voltage Vo ltage Range Frequenc y Range Phases

120VAC 108 to 132 VAC 54 to 66 Hz single 220VAC 198 to 242 VAC 54 to 66Hz single

Table 2.3.2-2 Maximum Primary Power Output Requirement

Voltage Current Comments

DC +48 V Max 10 A For RF power 8 watts

2.3.2.2 Battery Backup Power (Optional) The Pico BTS shall have battery backup to cope with AC power failure. The battery shall be monitored during normal operation, and charged if necessary. The Optional backup battery is provided with an external compartment. ` Ta ble 2.3.2-3 Battery Power Requirement

Configuration DC Current/Power Comments

Nominal RF Power 5 watt 5 A mps/240 VA up to 4 Hours backup

Optional RF Power 10 Amps/480 VA up to 4 Hours backup

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2.4 Physical Specifications

Table 2.4-1 Physical Specifications

Configuration Specifications

Size Max. depth: 12 inched

height: 32 in

width: 22 in

Weight max. 110 pounds

Mounting Location pad, pole, wall, or vault

2.5 Environmental Specifications

The Pico BTS will meet the extended environmental spec ifications in rugged outdoor conditio ns. The following table summarizes the environmental specifications :

Table 2.5-1 Environmental Specifications

Configuration Specifications Comments

Environmental Sealin g NEMA 4X

Lightning Protection ANSI 6241 Class B

Climatic Env ironment

Internal Heat Load 300 watts max.

Ambient Air Temp

( outdoor )

+500C max.

C min.

-40

Solar Load 70W/sq. ft

2.6 Reliability Specifications

2.6.1 MTBF

System down-time shall be no more than 10 minutes per year on the average, assuming a 2hour repa ir (re p la cing) time for a ny fai lu re .

2.6. 2 Battery Backup time

The battery s hall provide DC power until the cause of AC power is cleared. The nominal value o f this time period for backup battery operation shall be no greater than 4 hours.

2.6.3 Quality Materials

The aluminum used for the Pico-BTS enclosure may be machined from aluminum 6082 in accordance with standard QQ-A-2501/II TEMP T6.

2.6.4 Grounding Requirements

The specification for grounding and electric safety shall comply with the requirement described in TR-NWT-001089.

2.6.5 Alarm Requirements

The Pico BTS shall require alarms for the new hardware equipment, status dis play informatio n, and control capability to monitor the system performa nce as follows:

AC p ower fa i lu re

DC p ower fa i lu re

Malfunctio n of major control process ors

High internal temperature

Low internal temperature

Battery failure

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3. SYSTEM DESCRIPTION

3.1 System Functionality

The details of the hardware and software functio nality are des cribed in section 4 and section 5, respec tively. In this se ction, only brief outlines and essential deta ils of several critical factors are discussed.

3.1.1 Configuration

3.1.1.1 BSM Configurability As an element of the existing network, Pico- BTS s hould b e similar to existing BTSs from BSM’s point of view. Therefore, the basic nomenclature of its subsystem dividing a nd configuration should be similar to that of existing network in which it is supposed to work. By doing this, it is possible to use the existing messages and BSM screen entities with which the BSM operator might be familiar, to configure and manage this new element.

3.1.1.2 Initialization - Confi guratio n No redundancy will be provided in the Pico-BTS. Therefore once the system is configured through the initializatio n process , hardware configuration is not changed unless the whole sys tem is removed. The only change in hardware may be the nu mber of channel card. The Pico-BTS can support 32 channel elements. The operator will be allowed to change software configurable para mete rs t hrough on-li ne re c onfiguration.

3.1.1.3 Expandability When multiple Pico-BTSs are used to form a cell cluste r or a set of sectors, those Pico -BTSs are located close together. In this case, it is desirable to connect the multiple BTSs in a single backhaul transmiss ion facility such as T 1 line, to increase the backhaul efficiency. T he backhaul interface of the Pico-BTS supports this functionality by allowing daisy-chaining of the Pico-BTS. This functionality is us e ful when it requires to form a multi-sectored, multi-FA Picocell s ite .

3.1.2 Initialization

3.1.2.1 Startup Unlike the current BTS, the Pico-BTS has a self-contained enclosure which does not allow the sequential, manual power-up for each subsystem. There shall be one power switch for the system. As the power is turned on, each subsystem initializes itself and gets the software code by downloading from its upper level controller. The configuration information for the Pico-BTS comes from BSM , through BSC.

3.1.2.2 Loa ding S cheme A major change will be made in the software loading sche me. In the current loading scheme, the software is downlode d i nto BCPC from CCP, to which the software is downloaded from BSM, at power-up after the BIU initializes its e lf to acquire a path to the BSC for the do wnload. Then BCP downloads the software to each subsystem in the Pico BTS. In the Pico BTS, the executable flash memory will be provided for all hardware modules except BDC. The software will be stored in the executable flash memory and copied into the DRAM at power-up. BDC software will be stored in the flash memory of the BCPC.

3.1.2.3 BS Network Addressing Unlike the existing system which may have multiple trunk for a s ite, the Pico BTS can share a single trunk with adjacent neighbor Pico BTSs. Thus, in the BIU-CIN addressing field, the trunk number should be counted independently from the BTS identification.

3.1.3 Call Control

3.1.3.1 Normal Call/Handoff

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The Pico BTS processes a ll the normal calls, either mobile ori gination or termination, as in the call control procedures of the existing BTS. For the handoff procedures, all except the intersector softer handoff is the same as those o f the existing BT S. Therefore, it is possible to re -us e e xisting software.

3.1.3.2 Inters e ctor Softer Handoff Pico BTS shall support the intersector softer handoff when more than one Pico-BTS are configured for the multi-sec tor support.

3.1. 4 M aintenance and Admi nistrati on

3.1.4.1 Normal Operation During normal operation, Pico BTS performs various maintenance functions. The status supervision functionality is especially important because of the lack of redundancy in the architecture.

3.1.4.2 Fault Reporting/Alar m In case of a fault in any part of the Pico-BTS, it is reported immediately to the BSC and BSM. Hardware fault reporting can be the same as the current system, except that the Pico-BTS does not allow the switch-over to the standby unit. When hardware faults happen, it means the discontinuation of service in that cell. Thus the fault reporting function is more important than any other functions. Also, since the Pico-BTS is not protected by an air-conditioned and secured room, the environmental alarm and invasion alarms are to be monitored.

3.1.4.3 Installation/Mainten ance The Pico-BTS is equippe d in the self-enclosed pac kaging. Minimum effort is req uired to install and start-up the Pico-BTS. A small and simple panel for installation/maintenance personnel would be provided for minimal checkup procedures.

3.1.5 Network Operation

The following functionality is req uired for the Pico-BTS to work as an element of the CELLULAR network.

3.1.5.1 Resource Allo ca tion The Pico-BTS is an independent cell site. Thus the resources in the Pico-BTS are allocated independently through BSM. As in the current BTS, the channel elements, CDMA code channels, and the frame offsets are such resources.

3.1.5.2 Capac ity M anagement If required, the Pico-BTS can control its capacity by changing the limit for the number of active users it can support. This is done to maintain a specific quality of service. The detailed procedures and algorithms are the same as the one used in the existing s ystem.

3.1.5.3 RF Operation The Pico BTS supports cell blossoming and wilting mechanisms to facilitate the procedures of adding and re moving the cell site, just as in the current BTS. The parameters for the se processes shall be received from the BSM.

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3.2 System Architecture

3.2.1 Functional Architecture

GPS ANT

Surge

Protector

RX_AN

Surge

Protector

DPLX_AN

Surge

Protector

TX_PW

RMonito r

RBPF

DPLX

D/C

+5V +12V -12V +3.3V +7.5V

BBDC

RFFE

Back-u

pBatter y

Port

PWR

DC to DC Converter

DET

GPRP

1PPS, 10M,

ES,

BAC

SCLK,TOD

rx d

tx d

l n

ES,

SCLK

rx d

tx d

SCLK

n t

ES,

8 4

Addr, Data,

Cotrol

BDC

(i960

)

BDC

(i960

)

RXRF

+27V

RXRF

Addr, Data,

Cotro

XCVC

TxI

Alarm

10MH

IFRX

IFT

LNA

ACDC

+48V

AC to DC

Converte

Charge

110 / 220

VAC

CPowe

RFU BBU

BCPC

MPC860

RX+,RX

T1/

m I/O

E 1

TRK

T1/E

1TRK 2

D MPor

D TP C

TX+,TX

T1/E

Handle

RX+,RX

TX+,TX

1Handle

T1/E

Alar

Port

Figure.3. 2-1 Functional Arc hitecture

3.2.1.1 Tra nsc e i ve r Card (XCVC) XCVC performs frequency conversio n of transmitted and received signals, either RF to IF or IF to RF, and the amplifica tion of the signals, both transmitted and received. On the reverse link, it amplifies the received weak signal sent by the mobile station, a nd changes the carrier frequency to 4.95 MHz IF band. On the forward link, it takes the IF band si gnal, converts it to the a ctiv e RF carrier frequency, and then amplifies it to send through the antenna. In the Pico-BTS, only a single CDMA frequency is being supported to reduce the size and to make the configuration simple. Later, we can consider multi-FA Pico BTS as an option. In Pico BTS, XCVC and other RF unit controlling functions are consolida te d into BCPC.

3.2.1.2 Baseband Digital Card (BDC) BDC plays a central role in processing the CDMA baseba nd signal. There will be two BDCs in Pico BTS. Each BDC will support 16 Channel Eleme nts. Major functionality of BDC is as follows:

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Signal Processing of CDMA baseband in forward and reverse link.

Pr oces sing of messa ges r elevant to cal l contro l and maint enanc e

3.2.1.3 BTS Co ntrol Proc e ssor C a rd (BC PC ) BCPC is the main controller for the Pico-BTS. Its main functions are call control and maintenance of Pico BT S. Functionality of BCPC is desc ribed briefly:

Contains soft ware for call co ntrol a nd main tenance

Download the software into BDC at power up

Processing of call setup and tear-down/ handoff

Coll e c ts information fo r all hardware faults

Control RF network operation

Communication with BSC (CCP, TSB) for report and reception of upper-level control

OPAID - Operational AID, such as alarm indications, ...

BIU - Backhaul Interface Unit, this is the T1/E1 interface between BSC and Pico BTS.

Messa ge routing - BCPC will route t he messages wit hin Pico BTS.

RF uni t contr ol li ng func tio n

Process of the TOD and 1PPS received from the GPS receiver.

3.2.1.4 GPRP, BA C Ca r d GPRP generates timi ng and frequency references for Pico-BTS. T he ultimate reference comes from the GPS. As other subsyste ms, the general functionality is s imilar to those of the existing system. However, redundancy is not used.

Basic functionality is d es c ribe d as follows:

Generates system clock (19.6608 MHz), Buffered 10 MHz, EVEN-SEC clock.

Generates local clock in case of GPS failure

Frequency conversion of baseband signal to/from 4.95MHz IF signal

3.2.1.5 Backhaul Interface Unit (BIU) BIU performs the communication between the subs ys te ms of Pico BTS, and it is also the gateway to the BSC. Detailed architecture and functionality are described in chapter 4. In t he Pico BTS, BCPC will function as the gateway to BSC handli ng all messa ges transmitted/received to/from BSC . BCPC i nclud es t he BIU.

3.2.1.6 Inter Module Communication (IMC) In Pico BTS, the all other hardware modules are connected to BCPC through the point-to-poi nt serial connection forming a start network. The modules will co mmunicate each other via this serial c onnection. All mess ages will be transmitted in the HDLC format.

3.2.1.7 Power Subsystem Unit The Pico BTS uses 120VAC or 220VAC as its power source. It is equipped with a rectifier, a backup battery, and a distribution panel. The specification for the power subsystem follows:

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