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WiBro– A Mobile WiMAX System, and Radio Resource Management

Technical Presentation at George Washington University. WiBro– A Mobile WiMAX System, and Radio Resource Management. Byeong Gi Lee Seoul National University. Sept 22, 2006. ICT Snapshot - Services. Penetration of high-speed Internet (4Q 2005). 152M. 30%. 52M. 39%. 19M. 43%. 25M.

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WiBro– A Mobile WiMAX System, and Radio Resource Management

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  1. Technical Presentation at George Washington University WiBro– A Mobile WiMAX System,and Radio Resource Management Byeong Gi Lee Seoul National University Sept 22, 2006

  2. ICT Snapshot - Services Penetration of high-speed Internet (4Q 2005) 152M 30% 52M 39% 19M 43% 25M 73% Seoul National University, BG Lee, Sept. 2006

  3. ICT Snapshot - Devices Mobile phone market share (4Q, 2005) Seoul National University, BG Lee, Sept. 2006

  4. Wireless Internet in Korea 1 • Wireless Internet Subscribers (Source KT) Wireless Internet Subscribers 45 39M 38M 40 33M 35 97% 96% 30 27M 94% 25 20 2003 2001 78% 2005 2008 15 10 5 0 2001 2003 2005 2006.7 Mobile Phone Subscribers Wireless Internet Subscribers Seoul National University, BG Lee, Sept. 2006

  5. Wireless Internet in Korea 2 • Wireless Internet Sales (wrt Total Sales) 6.7 billion USD 3.7 billion 35.7% 2 billion 19.8% 0.5 billion 11.6% 4.6% 2003 2001 2005 2008 Seoul National University, BG Lee, Sept. 2006

  6. Part 1. WiBro: A Mobile WiMAX System Seoul National University, BG Lee, Sept. 2006

  7. What is WiBro? Mobility IP Broadband • Vehicle speed (60 km/h, 120 km/h) • Good performance while on the move • Compatible with Internet world • Diverse terminal types (PC/PMP/PDA/Phones etc) • 1Mbps per user • Broadband uploading capability WiBro (Wireless + Broadband) Harmonization with Mobile WiMAX Based on IEEE 802.16e Standard - An OFDMA based Profile of IEEE 802.16e Standard Seoul National University, BG Lee, Sept. 2006

  8. WiBro on the Evolution Paths to 4G 1995 2000 2005 2010+ 4G Fast OFDMA 1G (Analog) CDMA WiBro Slow 5 GHz WLAN 5 GHz WLAN 802.11b PAN 2.4 GHz WLAN 802.11a/g 802.11n ~ 14.4 kbps 144 kbps 384 kbps 50 Mbps 200 Mbps 1Gbps 3G (IMT2000) 2G (Digital) Seoul National University, BG Lee, Sept. 2006

  9. WiBro on the Evolution Paths to 4G 2000~2002 2003~2004 2005~2006 2008~2010 30Mbps 2Mbps/2Mbps 2Mbps/14.4Mbps WCDMA(R5) HSDPA WCDMA(R6) HSUPA Cellular Based (3GPP, 3GPP2) 153kbps/ 307kbps cdma2000 1x 1.8Mbps/3.1Mbps 153kbps/2.4Mbps 802.11a/g WCDMA 802.11b EV-DO 802.16a/b/d 3G LTE HSOPA 1.8Mbps/4.9Mbps* EV-DO Rev. A EV-DO Rev. B EV-DO Rev. C 4G WiBro 11Mbps 11Mbps 54Mbps 6Mbps/18.4Mbps 100Mbps Internet Based (IEEE) 802.16e WiBro-2 Harmonization 75Mbps(Fixed) Seoul National University, BG Lee, Sept. 2006

  10. IEEE 802.16 Standardization • IEEE 802.16 (~2001) • PHY and MAC standard for fixed wireless users with LOS (10~66GHz) • IEEE 802.16a (~Apr. 2003) • For fixed wireless users with NLOS (2~11GHz) • Three PHY structures: SC, OFDM, OFDMA • IEEE 802.16c (~Jan. 2003) • System profile for interoperability (10~66GHz) • IEEE 802.16d (Rev approval, June 2004) • Consolidated standard of .16, .16a, and .16c • IEEE 802.16e (WG ballot, June 2004) • 802.16d-based amendment for mobility Seoul National University, BG Lee, Sept. 2006

  11. Standards – 802.16 vs. WiBro • IEEE 802.16 and WiBro WiBro Mobility (Handoff & Sleep mode) MAC 802.16 e 802.16 d SC OFDM OFDMA Scalable OFDMA, MIMO, LDPC, Seoul National University, BG Lee, Sept. 2006

  12. WiBro Requirements Major System Parameters Radio Access Requirement Duplexing TDD Frequency Reuse Factor 1 Mobility ≤ 60 [Km/h] Multiple Access OFDMA Service Coverage ≤1 [Km] Channel BW 10 [MHz] Spectral Efficiency [bps/Hz/cell(sect.)] Max. DL / UL = 6 / 2 Aver. DL / UL = 2 / 1 Handoff ≤150 [ms] Throughput (per user) Max. DL / UL = 3 / 1 [Mbps] Min.DL/UL = 512/128 [Kbps] Seoul National University, BG Lee, Sept. 2006

  13. Cellular vs. WiBro vs. WLAN Metro Zone Cellular (2G, 3G) WiBro Hot Spot WLAN AP AP AP AP Indoor WiBro WLAN Cellular Seoul National University, BG Lee, Sept. 2006

  14. WiBro Network Architecture PSTN MSC Toll CDMA Trunk Gateway BSC BTS WiBro PMS CMS VCC IMS Back End Platform Server Farm (Portal, VOD, etc) RAS Core Router Edge Router ACR A Server Billing AAA Mediation WiFi Internet AP Edge Router Gateway Core Router NMS : Network Management System CMS : Contents Management System PMS : Product Management System VCC : Voice Call Continuity MSC : Mobile Switching Center IMS : IP Multimedia Subsystem RAS : Radio Access Station ACR : Access Control Router AAA : Authentication, Authorization and Accounting Seoul National University, BG Lee, Sept. 2006

  15. WiBro System by Samsung Electronics • Radio Access Station • Access Control Router Seoul National University, BG Lee, Sept. 2006

  16. WiBro System Functions User Traffic Plane Signaling Plane Core Network Traffic Interface Packet Forwarding Mobility Management Security Management Handoff Control (relay) Connection Control MIP FA Session Control Packet Classification ACR Packet Header Suppression ARQ MAC Scheduling Air Link Control Handoff Function MAC PDU Processing Physical Layer RAS Seoul National University, BG Lee, Sept. 2006

  17. Deployment of WiBro Services • Trials (’05~’06) • Commercial services (’06) • KT, SKT in Korea • Service trial and commercial service TVA in Brasil • Cooperation in progress with various operators and vendors in Mobile WiMax Forum Seoul National University, BG Lee, Sept. 2006

  18. Commercial WiBro Service by KT Located 20km South of Seoul Population: 450,000 Area: 70 Km2 • 22 Radio Access Stations • RAS • Repeater BunDang Area Seoul National University, BG Lee, Sept. 2006

  19. WiBro PHY - Features • High spectral efficiency support • TDD • Minimize guard band • 10MHz BW/OFDMA • Minimize multi-path interference • High modulation order (QPSK, 16QAM, 64QAM) & enhanced channel coding (convolutional turbo code) • Full coverage support • Cellular operation with frequency reuse factor 1 • High spectral efficiency & easy cell planning • Minimize interference using diversity subchannel • Compensate low SINR at cell edge using low rate coding • Fast handover with mobile IP Seoul National University, BG Lee, Sept. 2006

  20. WiBro PHY – Features (cont’d) • Performance enhancement considering mobility • H-ARQ • FEC and ARQ • Band selection AMC & diversity subchannel • For slowly moving users: allocate band selection AMC subchannels which have high channel quality • For fast moving users: allocate diversity subchannels • Support mobility • Short OFDM symbol • Pilot structure supporting channel estimation while moving • Support fast access during handover • Short frame length • Non-contention based control channel access Seoul National University, BG Lee, Sept. 2006

  21. WiBro PHY – Features (cont’d) • Flexible resource allocation • TDD: asymmetric DL / UL allocation • Subchannel-level multiuser scheduling • Power saving mechanisms • Sleep mode • Idle mode • Advanced optional features • Smart antenna support • Space-time code/Spatial multiplexing support Seoul National University, BG Lee, Sept. 2006

  22. WiBro PHY – OFDMA • Basic Concept of OFDM • Orthogonal Frequency Division Multiplexing : Advanced FDM • Divide into N orthogonal subcarriers • Transmit N symbols in N subcarriers respectively • Reconstruct N symbols using orthogonality • FDM: Use separated subcarriers (A, C, E) • OFDM : Use overlapped orthogonal subcarriers (A,B,C,D,E) Seoul National University, BG Lee, Sept. 2006

  23. WiBro PHY – OFDMA (cont’d) 1Mbps Stream (Ts : 1us) 10 X 100 Kbps (Ts : 10 us) • One Big Stream Huge bunch of small streams • Long Symbol Period  Robust to multipath fading ( Small guard time overhead) • Huge bunch + Orthogonality  Robust to narrowband interference  Efficient use of radio spectrum • Appropriate for Broadband System 1us delayed path signal Narrowband interference Strong Candidate for the Next-GenerationWireless Access Seoul National University, BG Lee, Sept. 2006

  24. WiBro PHY – System Parameters Seoul National University, BG Lee, Sept. 2006

  25. WiBro PHY – Subchannel • DL-Diversity subchannel (FUSC, full usage) • IDcell-based permutation • Distributed data subcarriers in a symbol Seoul National University, BG Lee, Sept. 2006

  26. WiBro MAC – Features • Flexible BW allocation • On frame basis • Flexible QoS provisioning • UGS, rtPS, nrtPS, BE • Efficient MAC PDU construction • Variable size MAC PDU • Fragmentation, packing, concatenation • Support header suppression • Energy-saving • Sleep & idle mode • Handover • Hard & soft handover • Multicast and Broadcast Services • Security support Seoul National University, BG Lee, Sept. 2006

  27. WiBro MAC – Frame Structure • Frame structure • Management messages (GMH & CRC) • DL-MAP, UL-MAP • Burst profile • Uplink control channel (CQI, ACK, ranging) Seoul National University, BG Lee, Sept. 2006

  28. WiBro Evolution Issues • Scalability • 10/20/40MHz TDD, 10/20 MHz FDD • Throughput enhancement • MU-MIMO, LDPC • Mobility improvement • Up to ~300Km/h • Spectral efficiency increase • Up to ~10b/s/Hz/cell • Control overhead minimization • Multi-hop relay • Backward compatibility Seoul National University, BG Lee, Sept. 2006

  29. Comparison of WiBro, HSPA, and EVDO Seoul National University, BG Lee, Sept. 2006

  30. WiBro Services Personal • Integrated Messaging Service - SMS/MMS, Group Messaging - Instant Messaging/Chatting • Mobile Blog - Web Blog + Mobile • Telematics - Traffic Information, Location Search, etc. IP Telephony • VoIP,Video Telephony • PTA - PTT (Push to talk- 1:N telephony) - PTD (Push to Data - Send data during PTT) - PTV (Push to Video - 1:N Video telephony) Internet Entertainments • AOD/MOD, VOD • Streaming Broadcasting • 3D/Interactive Game • Web Service - E-mail, Internet Browsing • Information On Demand - Personalized Information Service • M-Commerce Seoul National University, BG Lee, Sept. 2006

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