Extending Voice & Data Coverage with Ease

Colombo, Sri Lanka, 7-10 April 2009

Extending Voice & Data Coverage with Ease

R.Thirumurthy,Midas Communication Technologies

Pvt. Ltd

FORUM ON NEXT GENERATION STANDARDIZATION

(Colombo, Sri Lanka, 7-10 April 2009)


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Outline

MotivationCoverage Expansion Issues

Technology Rural Aspects

Summary


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Among other issues, key are Rural aspects requirements and Technology choice

Motivation

Technology Choice

Our view on the Potential solution w.r.t Technology, standardization& regulation on• Technology Choice• Poor Infrastructure• Sparse Population• Efficiently catering to voice & Data

Rural Coverage


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Various BWA technologies in offering and in pipeline

Parallel technologies with little in common Wait & watch approach for investment

Choices in Technology

802.16e

EVDO

HSPA

802.16m

LTE Advanced

Spectrum Issues- Different spectrum and channel sizesWCDMA

LTE

Aimed at- High mobility- Dense deployment- Broadband centric


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Air Interface and Spectrum Issues

Technology Choice How to live with it?

Channel Size

(MHz)

Uplink Access

Operating Frequency

(GHz)

802.16e 5, 7, 8.75,10 OFDMA 2.3-2.4, 2.5-2.7, 3.3-3.8

WCDMA 5 WCDMA 3G Spectrum

802.16m 5-20 OFDMA < 6 GHz

LTE 1.25-20 SC-FDMA 3G spectrum, 900 MHz


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Reuse of Transmission, Provisioning and other core infrastructure elements

Unified Architecture

Reuse of Access Systems, insulate CAPEX from changing technologies

Soft BTS

Technology Choice Protecting CAPEX


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Flat Architecture RRC and RRM moved to BTS Standard IP interface from BTS to Access Gateway Standardization on protocol between BTS and

Access gatewaySecurity, QOS, Connection Management, AAA, Mobility etc

Unified Architecture

AccessGw

802.16e/LTE/

HSPA..CSN IP Backhaul


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Software BTS SDR Re-configurable PHY and MAC Re-configurable wideband RF Process .16e, .16m or LTE, LTE-A waveforms

Soft BTS


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Hurdles in Rural Coverage

Low ARPUE.g. GSM Voice - $4.5/month and CDMA Voice $2.5/month

Low subscriber densityLack of Infrastructure

Unavailability of power results in high usage of diesel increasing the OPEX by $300 per monthEnvironmentally hardened, small footprint, low weight

Backhaul cost

Source: TRAI Report 13-Jan-09, Survey by FICCI


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What do rural areas need?

Rural - Requirements

Services

Broadband Data

Voice

Speed?Delivery Media

Terminals? Handsets? < 1 Mbps? > 1 Mbps? > 5 Mbps?


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What is required?

Rural Coverage

By 2013, 3G Modem Subscriber base will still be significant (22 M)

WiMax to connectCSC, education instt & Health centers

Initial 3G deployments likely to be voice centric

Few HIS +Basic services atLow CAPEX &OPEX

Source: Survey by FICCI and BDA

WiMax will targetResidential desktops, Laptops

Technologies Optimized for rural deployments

Active Infrastructure sharing

Power Aware BTS


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Minimize risk on low ARPU & uncertain market sizeVirtual BTS

Virtualization of BTS Resources Standardized Management Interface

Active Infrastructure Sharing

VirtualBTS1

VirtualBTS2

VirtualBTSn

AccessGw

(Oper-1)

AccessGw

(Oper-2)

AccessGw

(Oper-n)

Active BackhaulSharing

Active BTSSharing

QoS Fairness in Backhaul?

Spectrum ?


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High Mobile users and heavy data users are relatively lowRequirement for basic service like voice and moderate data usageBTS power intelligence to adopt to different conditions

Reduces the power backup required (e.g. diesel, Battery, Solar panel)

Power Aware Systems

Note: Graphical data relative and conceptual

100%

75%

50%

time

Reduce Tx Power maintain coverage

T

Switch to Backup power

25%

Capacity


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Reduce the Power Amp switch-on timeReduce the coding level (QAM64 –› QAM16 –› QPSK…)Admission control to prioritize emergency services like voice etc.LightGSM - Reduce Transmit Power, BCCH channels have higher Error protection, MS would be able to detect BTS. Switch back to normal power on detecting traffic

Power Aware Systems - Capacity

Note: Graphical data relative and conceptual

Tx Rx

Capacity Management in TDM Systems

100%

75%

50%


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Midas’s work in this direction

SNAP! Platform Soft BTS supporting Multi technologies (GSM,

802.16e and Enhanced DECT) Support for 400 MHz to 4 GHz in TDD BTS communication to WiMax ASN G/w Scalable Channel Bandwidth (5, 10, 20 MHz)

BTSTower-TopUnit

BTS

ASNG/w

IP Backhaul


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corDECT/Enhanced DECT for Rural Wireless DSL Spectrum available in various countries

Uncoordinated use of spectrum

Provide Voice/FAX/Modem and Broadband Data service, essential for CSC etc.

corDECT/Enhanced DECT

- 1880-1930 MHz - IMT2000 DECT- Uncoordinated use of spectrum- 10 Km coverage- Low power requirement

DECT Roadmap - Meet IMT-Advanced Reqr- OFDMA Support- MIMO Support


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corDECT/Enhanced DECT Star ChartSecuritySecurity

Low PowerLow Power

NLOSNLOS

LatencyLatency

Flat IP ArchFlat IP Arch

Dynamic Channel Dynamic Channel SelectionSelection

MobilityMobility

Spectrum Spectrum EfficiencyEfficiency

CAPEX CAPEX ReuseReuseHigh Voice High Voice

QoSQoS


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Summary

Coverage Expansion IssuesTechnology Choice

Air Interface & Spectrum issuesProtecting CAPEX

Rural ExpansionRural RequirementsInfrastructure SharingPower Optimized BTSMulti Technology POP platforms

Extending Voice & Data Coverage with Ease

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