FORUM ON NEXT GENERATION STANDARDIZATION
(Colombo, Sri Lanka, 7-10 April 2009)
Extending Voice & Data Coverage
with Ease
R.Thirumurthy,
Midas Communication Technologies
Pvt. Ltd
Colombo, Sri Lanka, 7-10 April 2009
Outline
Motivation
Coverage Expansion Issues
Technology
Rural Aspects
Summary
Colombo, Sri Lanka, 7-10 April 2009
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Motivation
Among other issues, key are Rural
aspects requirements and Technology
choice
Technology Choice
Rural Coverage
Colombo, Sri Lanka, 7-10 April 2009
Our view on the Potential solution
w.r.t Technology, standardization
& regulation on
• Technology Choice
• Poor Infrastructure
• Sparse Population
• Efficiently catering to voice & Data
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Choices in Technology
Various BWA technologies in offering and in
pipeline
Parallel technologies with little in common
Wait & watch approach for investment
EVDO
HSPA
WCDMA
802.16e
802.16m
LTE
Spectrum Issues
- Different spectrum
and channel sizes
Aimed at
- High mobility
- Dense deployment
- Broadband centric
LTE Advanced
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Technology Choice
How to live with it?
Air Interface and Spectrum Issues
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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Technology Choice
Protecting CAPEX
Reuse of Transmission, Provisioning and
other core infrastructure elements
Unified Architecture
Reuse of Access Systems, insulate CAPEX
from changing technologies
Soft BTS
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Unified Architecture
Flat Architecture
RRC and RRM moved to BTS
Standard IP interface from BTS to Access Gateway
Standardization on protocol between BTS and
Access gateway
Security, QOS, Connection Management, AAA, Mobility
etc
CSN
Access
Gw
Colombo, Sri Lanka, 7-10 April 2009
802.16e/
LTE/
HSPA..
IP Backhaul
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Soft BTS
Software BTS
SDR
Re-configurable PHY and MAC
Re-configurable wideband RF
Process .16e, .16m or LTE, LTE-A waveforms
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Hurdles in Rural Coverage
Low ARPU
E.g. GSM Voice - $4.5/month and CDMA Voice
$2.5/month
Low subscriber density
Lack of Infrastructure
Unavailability of power results in high usage of
diesel increasing the OPEX by $300 per month
Environmentally hardened, small footprint, low
weight
Backhaul cost
Source: TRAI Report 13-Jan-09, Survey by FICCI
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Rural - Requirements
What do rural areas need?
Services
Broadband
Data
Delivery Media
Terminals?
Handsets?
Colombo, Sri Lanka, 7-10 April 2009
Voice
Speed?
< 1 Mbps?
> 1 Mbps?
> 5 Mbps?
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Rural Coverage
What is required?
WiMax to connect
CSC, education instt &
Health centers
Initial 3G deployments
likely to be voice
centric
By 2013, 3G Modem
Subscriber base will still
be significant (22 M)
Technologies
Optimized for rural
deployments
Few HIS +
Basic services at
Low CAPEX &
OPEX
Active Infrastructure
sharing
Power Aware BTS
WiMax will target
Residential desktops,
Laptops
Source: Survey by FICCI and BDA
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Active Infrastructure Sharing
Minimize risk on low ARPU & uncertain market size
Virtual BTS
Virtualization of BTS Resources
Standardized Management Interface
Access
Gw
(Oper-1)
Spectrum ?
Virtual
BTS1
QoS Fairness in
Backhaul?
Virtual
BTS2
Virtual
BTSn
Active BTS
Sharing
Colombo, Sri Lanka, 7-10 April 2009
Access
Gw
(Oper-2)
Active Backhaul
Sharing
Access
Gw
(Oper-n)
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Power Aware Systems
High Mobile users and heavy data users are
relatively low
Requirement for basic service like voice and
moderate data usage
BTS power intelligence to adopt to different
conditions
Reduces the power backup required (e.g. diesel, Battery,
Solar panel)
Switch to
Backup power
Reduce Tx Power
maintain coverage
100%
75%
50%
Note: Graphical data relative
and conceptual
25%
time
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T
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Power Aware Systems - Capacity
Reduce the Power Amp switch-on time
Reduce 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
100%
75%
50%
Tx
Rx
Capacity Management in TDM Systems
Note: Graphical data relative and conceptual
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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)
BTS
Tower-Top
Unit
ASN
G/w
IP Backhaul
BTS
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corDECT/Enhanced DECT
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.
-
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 Chart
Security
Dynamic Channel
Selection
Flat IP Arch
Spectrum
Efficiency
CAPEX
Reuse
High Voice
QoS
Low Power
Latency
NLOS
Colombo, Sri Lanka, 7-10 April 2009
Mobility
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Summary
Coverage Expansion Issues
Technology Choice
Air Interface & Spectrum issues
Protecting CAPEX
Rural Expansion
Rural Requirements
Infrastructure Sharing
Power Optimized BTS
Multi Technology POP platforms
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