LTE Networks: how far are the achievable capacities fromthe theoretical ones?                        ICUMT 2012, October 3...
Agenda   1.       Broadband LTE Radio Interface   2.       Method for Capacity Calculations   3.       Influence of Interf...
Broadband LTE Radio Interface
Broadband LTE Radio Interface3GPP Radio Access Networks Evolution      1992        1997               2000          2005  ...
Broadband LTE Radio InterfaceLTE Overview                                                Flat architecture and All-IP stru...
Broadband LTE Radio InterfaceLTE Performance Requirements    The main targets / requirements for the LTE are (ref. TS 25.9...
Method for Capacity Calculations
Method for Capacity CalculationsExample Calculations of Offered Capacity Calculation                                      ...
Impact of Interference on Network Capacity
Impact of Interference on Network CapacityA Model Network for Capacity Calculations                                    Rad...
Impact of Interference on Network CapacityDownlink SNIR [dB] Distribution Snapshot Example                      Frequency ...
Practical LTE Capacity
Practical LTE CapacitySector Throughput                    System              Peak              Average            Cell e...
LTE Capacity - Summary
LTE Capacity - SummaryTheoretical vs Practical Network Throughputs          Bandwidth / System Type         Theoretical se...
4G-Online.net – Business Case Calculations
4G-University.comPlatform for sharing practical knowledge on 4G   Copyright © IS-Wireless | www.is-wireless.com   17
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LTE Networks: How far are the achievable capacities from the theoretical ones? – Keynote from IS-Wireless

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Dr. Slawomir Pietrzyk, CEO of IS-Wireless, has delivered a keynote speech entitled “LTE networks: how far are the achievable capacities from the theoretical ones” during the IV International Congress on Ultra Modern Telecommunications and Control Systems 2012 which was held in Sankt Petersburg, Russia on October 3-5.

To learn more about our LTE/LTE-Advanced course portfolio, please follow the link: http://is-wirelesstraining.com/trainings

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LTE Networks: How far are the achievable capacities from the theoretical ones? – Keynote from IS-Wireless

  1. 1. LTE Networks: how far are the achievable capacities fromthe theoretical ones? ICUMT 2012, October 3-5, Sankt Petersburg, Russia
  2. 2. Agenda 1. Broadband LTE Radio Interface 2. Method for Capacity Calculations 3. Influence of Interference on Network Capacity 4. Practical LTE Capacity 5. LTE Capacity - Summary 6. 4G-Online.net – Business Case Calculations Copyright © IS-Wireless | www.is-wireless.com 2
  3. 3. Broadband LTE Radio Interface
  4. 4. Broadband LTE Radio Interface3GPP Radio Access Networks Evolution 1992 1997 2000 2005 2009 2011 GSM GPRS UMTS HSPA LTE LTE-Advanced 2G 2.5G 3G 3.5G 3.9G 4G Rel. 96 Rel. 5 Phase 1 Rel. 99 Rel. 8 3GPP Rel. 97 Rel. 6 Rel. 10 Phase 2 Rel. 4 Rel. 9 Release Rel. 98 Rel. 7 UL: 128kbps UL: 11Mbps UL: 75Mbps UL: 500Mbps Highest Voice only 14.4kbps DL: 384kbps DL: 28Mbps DL: 325Mbps DL: 1Gbps Data Rate Copyright © IS-Wireless | www.is-wireless.com 4
  5. 5. Broadband LTE Radio InterfaceLTE Overview Flat architecture and All-IP structure eNB SGW Internet/ ... IP IP IP • always-on concept • World-wide roaming • High throughputs IP eNB • Mobile internet • Low latencies IP IP eNB IP MME Radio Access Network Core Network Theoretical Throughputs LTE Services Direction Downlink Uplink • VoIP/video conferences Channel BW • WWW • Video on Demand 10MHz 138Mbps (4x4) 37Mbps • Online Gaming 20MHz 325Mbps (4x4) 75Mbps • FTP 172Mbps (2x2) Copyright © IS-Wireless | www.is-wireless.com 5
  6. 6. Broadband LTE Radio InterfaceLTE Performance Requirements The main targets / requirements for the LTE are (ref. TS 25.913): • Peak data rate: e.g. 100 Mbps (downlink) and 50 Mbps (uplink) • Scalable bandwidth: 1.4, 5, 10, 15, 20MHz eNB • At least 200 VoIP users served in a 5MHz FDD bandwidth (giving 800 VoIP users in 20MHz bandwidth) • Efficient support of the various types of services, especially from the PS domain (e.g. Voice over IP) Copyright © IS-Wireless | www.is-wireless.com 6
  7. 7. Method for Capacity Calculations
  8. 8. Method for Capacity CalculationsExample Calculations of Offered Capacity Calculation Ustawienia: BW_network = 30MHz 1 sector BW_sector = BW_network/3 = 10MHz 1 carrier Frequency Reuse = 3 carrier Each sector – a different carrier SE – spectral efficiency for a certain SNIR SNIR1 = 1.5dB MCS = QPSK ½ SE1 = 2 * ½ = 1bps/Hz SNIR2 = 7dB MCS = 16QAM ½ SE2 = 4 * ½ = 2bps/Hz From MCS curves SNIR_usage – percent of area on which a certain SNIR occurs SNIR_usage1 = 50% of total area = 0.5 SNIR_usage2 = 50% of total area = 0.5 50% of total area SE_average = ∑ SEi * SNIR_usagei experienced SNIR = 7dB SE_average = SE1*SNIR_usage1 + SE2*SNIR_usage2 = 1*0.5 + 2*0.5 = 1.5bps/Hz 50% of total area experienced SNIR = 1.5dB Offered sector capacity R_sector = BW_sector *SE_average = 10MHz * 1.5bps/Hz = 15Mbps This method is used to calculate average capacity (overhead neglected) Copyright © IS-Wireless | www.is-wireless.com 8
  9. 9. Impact of Interference on Network Capacity
  10. 10. Impact of Interference on Network CapacityA Model Network for Capacity Calculations Radio interface: LTE or Mobile WiMAX EIRP = 61dBm Inter site distance = 2km Average sector capacity is calculated in the presence of interference Reuse 1 – each sector of a single BS is assigned full BW Reuse 3 – each sector of a signle BS is assigned 1/3 of the full BW Copyright © IS-Wireless | www.is-wireless.com 10
  11. 11. Impact of Interference on Network CapacityDownlink SNIR [dB] Distribution Snapshot Example Frequency Reuse 1 Frequency Reuse 3 Considered Cell Cell edge (SNIR < 0dB) Max SNIR = 16.9dB Max SNIR = 65dB Min SNIR = -4.7dB Min SNIR = -3.3dB Steep SNIR and Best SNIR butSNIR range = ~21dB all resources per sector SNIR range = ~68dB less resources per sector Copyright © IS-Wireless | www.is-wireless.com 11
  12. 12. Practical LTE Capacity
  13. 13. Practical LTE CapacitySector Throughput System Peak Average Cell edge Peak / Cell edge throughput throughput throughtput ratio LTE Rel. 8 64.2 Mbit/s 27.0 Mbit/s 9.6 Mbit/s 6.6 1x1, reuse 1 LTE Rel. 8 29.3 Mbit/s 12.5 Mbit/s 3.8 Mbit/s 7.6 1x1, reuse 3 LTE Rel. 8 121.9 Mbit/s 27.0 Mbit/s 9.6 Mbit/s 12.6 2x2, reuse 1 LTE Rel. 8 55.7 Mbit/s 12.5 Mbit/s 3.8 Mbit/s 14.5 2x2, reuse 3 LTE Rel. 8 231.7 Mbit/s 27.0 Mbit/s 9.6 Mbit/s 24.1 4x4, reuse 1 LTE Rel. 8 107.9 Mbit/s 12.5 Mbit/s 3.8 Mbit/s 28.2 4x4, reuse 3 LTE-A (Rel. 10) 440.3 Mbit/s 27.0 Mbit/s 9.6 Mbit/s 45.8 8x8, reuse 1 LTE-A (Rel. 10) 199.4 Mbit/s 12.5 Mbit/s 3.8 Mbit/s 52.1 8x8, reuse 3 Assumptions: - Throughput is calculated for 1 UE (UE gets all resources) - For reuse 3 each sector is assigned 1/3 of 20MHz (6.67MHz) - MIMO increases throughput only near eNB (peak throughput increase) - Cell edge throughput is calculated for 5% of area with worst SNIR - Signalling resources not excluded Copyright © IS-Wireless | www.is-wireless.com 13
  14. 14. LTE Capacity - Summary
  15. 15. LTE Capacity - SummaryTheoretical vs Practical Network Throughputs Bandwidth / System Type Theoretical sector data rate Practical sector data rate 10MHz LTE FDD 50Mbit/s 11.6Mbit/s Comparable with fixed lines (e.g. DSL) 100Mbit/s 20MHz LTE FDD 23.3Mbit/s (325Mbit/s with MIMO) 20MHz LTE TDD 65Mbit/s 12.7Mbit/s (3:2) Theoretical Throughputs Practical Throughputs • Achievable in lab • Relate do the propagation conditions • Don’t take into account signalling • Take into account real signalling • Neglect propagation conditions • Calculated in real propagation conditions (e.g. interference, channel distortions, noise, etc.) Copyright © IS-Wireless | www.is-wireless.com 15
  16. 16. 4G-Online.net – Business Case Calculations
  17. 17. 4G-University.comPlatform for sharing practical knowledge on 4G Copyright © IS-Wireless | www.is-wireless.com 17

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