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Network Breaking Point-01 hugh bradlow

Network Breaking Point-01 hugh bradlow

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  • 1. Network Breaking Point:  Network Breaking Point: Managing demand and user  experience Hugh Bradlow Chief Technology Officer Chief Technology Officer Telstra Corporation Ltd© 2011 Telstra Corporation Limited. All rights reserved
  • 2. Overview Drivers of Demand Designing  Networks for user experience Designing Networks for user experience Meeting demand without breaking the network h l – New Technology – New Spectral Bands – Traffic Management – Femtocells © 2011 Telstra Corporation Limited. All rights reserved 3
  • 3. The 2 dimensions of network demandRelative RAN Signalling  Traffic Demand Load per MByte of Data Global mobile data traffic grew 2.6-fold in 2010. Expecting 26-fold increase between 2010 and 2015. (Cisco, 2011) 100 Smart phone 10 M2M (sensor, Polling @ 20 sec) P lli @ 20 ) 1 Tablet Feature phone Feature phone Laptop User Data (per device) MByte/Month (2010) 1 10 100 1000 Traffic Capacity and Signalling Capacity are both potential bottlenecks © 2011 Telstra Corporation Limited. All rights reserved 4
  • 4. Designing for User Experience World Class Network Availability• “Al “Always 3G” 3G” • With extensive coverage• Backhaul capacity Weekly Record• Signal Strength for indoor  g g Superior Downlink Throughput coverage• Technology Leadership Technology Leadership• Continuous Monitoring  Weekly Record © 2011 Telstra Corporation Limited. All rights reserved 5
  • 5. Technology advances improve spectral efficiency 2.0 20 2015 LTE-Adv – Further performance enhancing technologies for LTE – advanced 2007 – 2009 HSPA+ – P f heterogeneous i Performance enhancing MIMO, carrier aggregation, h 1.5 /MHz 2011 LTEnetworks, –reduced (64QAM, MIMO, dual technologies added to HSPA with increased 2004 OFDM relays, cooperative – WCDMA – CDMA channel). Also, importantly, improved handset interference, frequency domain MHz) bandwidth (5 communications s/cell/ 20062003 receivers–(twoMIMO, for packetpacket scheduling, improved antennas, equaliser) HSPA – CDMATDMA optimised for data EGPRS optimised 1.0 scalable bandwidth up to 20 MHz data. Enhanced with 8PSK, HARQ (& others) Mbps 1992 GSM – Basic TDMA – no 2001 GSM – Improved interference control smarts using Slow Frequency Hoppint 0.5 0.0 00 1990 1995 2000 2005 2010 2015 © 2011 Telstra Corporation Limited. All rights reserved 6
  • 6. Technology advances also reduce cost per bit Cost per MByte as % of GPRS 100 90 80 70 60 50 40 30 20 10 0 GPRS EDGE WCDMA HSDPA HSPA+ LTE (R99) © 2011 Telstra Corporation Limited. All rights reserved 7
  • 7. LTE performance improvements p p Opens up new frequency bands  Spectral efficiency Possible – Flexible allocation of radio channel bandwidths between 1.25  R10 HSPA+ ? DL Spectral efficiency Target MHz and 20 MHz, utilising FDD and/or TDD duplex modes MHz and 20 MHz utilising FDD and/or TDD duplex modes 4 Enhanced Radio Network performance:  Sector 3 HSPA+ – Increased spectral efficiency LTE (10 MHz) ( ) Bits/Hz/S – Lower Latency 2 – Peak data rates: 1 R7 R8 R8 R8 R9 R9 R10 • p ( p g ) Downlink >100 Mbps (> 40 Mbps cell average) 0 • Uplink >50 Mbps Also enhanced core network Latency RTT – Flat All‐IP network architecture ~‐80 ms – Self‐organisation, self‐configuration and self‐optimisation ~‐20 ms © 2011 Telstra Corporation Limited. All rights reserved 8
  • 8. Data Demand outstripping Technology Improvement 60 50 8 value 40 X  times 2008 Spectral efficiency  Spectral efficiency 30 improvements Data demand  growth 20 10 0 Further technology improvements 2006 2008 2010 2012 2014 2016 Spectral efficiency improvements and data demand growth relative to 2008 Technology Improvements not keeping pace with demand Limited Spectrum resources for mobile access services (450MHz to 3.4GHz) What else is possible? – Open up New spectral bands • Including using TDD to utilise more spectrum l d l – Traffic Management © 2011 Telstra Corporation Limited. All rights reserved 9
  • 9. New Spectral Bands 5 MHz 10 MHz centre gap 3 MHz700 MHz DD band: DTTV 45 MHz 45 MHz PPDR/LMR 694 MHz 698 MHz 806 MHz FDD ?? FDD Possible  Possible 15  15 15  15 15  15 15  15 15  15 15  15 Channels: MHz MHz MHz MHz MHz MHz Met  20 MHz  Fixed & Mobile 75 MHz 75 MHz Satellite  centre gap Services1800 MHz band: 1710 MHz 1880 MHz FDD TDD? FDD Possible   Various combinations of 10/15/20 MHz                    Various combinations of 10/15/20 MHz  Channels: channels 10+10? channels Satellite  70 MHz 70 MHz Earth Exploration &  (various) 50 MHz centre gap Radio Astronomy2500 MHz band: 2500 MHz FDD TDD FDD 2690 MHz Possible  20  20  20  10  10  10  10  10  10  20  20  20  10  Channels: MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz Space Research 98 MHz Class Licenced – LIPDs/Wi‐Fi2300 MHz band: MH b d 2302 MHz TDD 2400 MHz Possible  4  20  20  20  20  10  4  Channels: MHz MHz MHz MHz MHz MHz MHz © 2011 Telstra Corporation Limited. All rights reserved 10
  • 10. Traffic Management Application 3GPP Rx (Diameter) (Di t ) or SOAP NSN PCS 5000 NSN OneNDS Traffic  (3GPP PCRF) (3GPP SPR) Management Telstra 3GPP Gx services (Diameter) Acceleration Policy Control Policy Control Ericsson GGSN Internet PCRF – Policy & Charging Rules Function QoS Charging  Charging SPR – Subscription Profile Repository mechanisms mechanisms User based  Application  Terminal  Location  priority based priority based priority based priorityScheduling Priority Scheduling Priority Connection  Connection Active  Active Rate shaping Rate shaping Admission Control  Queue Management 11 © 2011 Telstra Corporation Limited. All rights reserved
  • 11. “Why QoS?”: Meeting performance targets 100 Real-time Service without QoS Protection sec) Real-time Service with QoS Protection sfer Delay (s 10 Non-real-time service at best-effort QoS Acceptable User Satisfaction for Real-time Service 1 Avg. Pkt. Burst Trans 100ms 0.1 0.01 0 0.2 0.4 0.6 0.8 1 Utilisation ρ Utilisation, Without QoS, the traffic exceeds performance targets at relatively low network utilisation (~45%) With QoS, the network is capable of high utilisation (up to 95%) while still meeting the performance targets for the real‐time traffic – Connection Admission Control (CAC)  is required for the real‐time traffic to prevent overall network collapse. © 2011 Telstra Corporation Limited. All rights reserved 12
  • 12. Network Build Options for Public Safety Agencies1 Separate Network p Internet Public IP Core PSA IP Core Public Network Packet Network Gateway PSA Packet Gateway PSA Public 3G/4G Access Network 3G/4G Access Public UEs Network Public Safety Agency (PSA) Command Centre2 Shared Network but not Spectrum 3 Complete Sharing QoS-enabled Internet Packet Gateway Internet Common Common IP Core IP Core Common Network Network Packet Gateway Fully Shared Partially Shared 3G/4G Access 3G/4G Access Network (towers Network (towers only) PSA Command + spectrum) PSA Command Centre Centre © 2011 Telstra Corporation Limited. All rights reserved 13
  • 13. Signalling and Acceleration CELL_DCH CELL_FACH _ CELL_PCH or URA_PCH URA PCH IDLE © 2011 Telstra Corporation Limited. All rights reserved 14
  • 14. Femtocells User‐installed – Why bother? – Coverage? Next GTM: Indoor coverage already excellent Coverage? Next G : Indoor coverage already excellent – Capacity? Data hungry devices already offload to Wi‐Fi (laptops, tablets) Operator‐installed – Network cost reduction – As part of a planned network, femto and pico‐cells can reduce network costs © 2011 Telstra Corporation Limited. All rights reserved 15
  • 15. Summary Demand for Wireless Broadband is  exceeding improvements in Spectral  Efficiency New Spectral Bands are part of the  solution Traffic Management will be critical in  meeting demand © 2011 Telstra Corporation Limited. All rights reserved 16