Extending Voice

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Extending Voice Data Coverage with Ease
FORUM ON NEXT GENERATION STANDARDIZATION
(Colombo, Sri Lanka, 7-10 April 2009)

• R.Thirumurthy,
• Midas Communication Technologies Pvt. Ltd

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Outline

• Motivation
• Coverage Expansion Issues
• Technology
• Rural Aspects
• Summary

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Motivation

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

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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Choices in Technology

• Various BWA technologies in offering and in
  pipeline
• Parallel technologies with little in common
• Wait watch approach for investment

EVDO
HSPA
Spectrum Issues - Different spectrum and channel
sizes
WCDMA
802.16e

• Aimed at
• - High mobility
• Dense deployment
• Broadband centric

802.16m
LTE
LTE Advanced
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Technology Choice How to live with it?

• Air Interface and Spectrum Issues

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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

802.16e/ LTE/ HSPA..
Access Gw
CSN
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
Voice
Speed?
Delivery Media
Terminals?
Handsets?
lt 1 Mbps?
gt 1 Mbps?
gt 5 Mbps?
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Rural Coverage

• What is required?

WiMax to connect CSC, education instt Health
centers
Technologies Optimized for rural deployments
Initial 3G deployments likely to be voice
centric
Few HIS Basic services at Low CAPEX OPEX
Active Infrastructure sharing
By 2013, 3G Modem Subscriber base will still be
significant (22 M)
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?
Access Gw (Oper-2)
Virtual BTS2
Active Backhaul Sharing
Virtual BTSn
Access Gw (Oper-n)
Active BTS Sharing
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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)

Note Graphical data relative and conceptual
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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

Tx
Rx
100
75
50
Capacity Management in TDM Systems
Note Graphical data relative and conceptual
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Midass 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
Mobility
NLOS
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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