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OFDMA SYSTEM Mobile WiMAX 802.16e and Next Generation PHS

OFDMA SYSTEM Mobile WiMAX 802.16e and Next Generation PHS. Fire Tom Wada Professor, Information Engineering, Univ. of the Ryukyus. New Broadband Wireless Access Service in Japan. Japan government assigned 2.5GHz BWA bands to Two Companies on 2007/December. UQ communications (KDDI)

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OFDMA SYSTEM Mobile WiMAX 802.16e and Next Generation PHS

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  1. OFDMA SYSTEMMobile WiMAX 802.16eand Next Generation PHS Fire Tom Wada Professor, Information Engineering, Univ. of the Ryukyus System Architecture 2008

  2. New Broadband Wireless Access Service in Japan • Japan government assigned 2.5GHz BWA bands to Two Companies on2007/December. • UQ communications (KDDI) • 2,595MHz - 2,625MHz30MHz bands • Mobile WiMAX (802.16e, OFDMA) • Willcom • 2,545MHz - 2,575MHz • (2,545 - 2,555MHzafter 2014) • XG-PHS(OFDMA, SC-FDMA) • They starts service on 2009. System Architecture 2008

  3. Wireless Communication Services • In-door • WLAN • 802.11b (CDMA) → 802.11g/a (OFDM) →802.11n (MIMO-OFDM) • Out-door • Cell Phones • PDC, CDMA, CDMA2000, WCDMA →3.9G LTE (OFDMA, SC-FDMA) • PHS　→　XG-PHS(OFDMA, SC-FDMA) • New • WiMAX (802.16d, OFDMA) →Mobile WiMAX (802.16e, OFDMA) ALL systems are shifting to OFDM/OFDMA. System Architecture 2008

  4. UQ communications • MobileWiMAX • Schedule • 2008/8 ： 1st Base Station • 2009/2： Experimental Service in Tokyo/Yokohama • 2009/summer：Public service starts in limited area System Architecture 2008

  5. Willcom WILLCOM CORE :Next Generation PHS(XGPHS) • 2009/4：limited Area Servicein Tokyo • 2009/10：Public Service Starts in Tokyo, Nagoya, Osaka • - 2012/3: All prefecture’s capital city • - 2013/3： Other city Area in Japan System Architecture 2008

  6. Multiple Access DownLink UpLink Base Station(BS) System Architecture 2008

  7. Multiplexing • Separate Downlink and Uplink • FDD : Frequency Division Duplex • TDD: Time Division Duplex • Separate Each User • FDD : Frequency Division Duplex • TDD: Time Division Duplex • OFDM: Orthogonal Frequency Division Multiple Access • BWA systemsMobile WiMAX, XG-PHS use TDD-OFDMA! System Architecture 2008

  8. OFDMA Spectrum User A User C User A Frequency User B User B Frequency User C BS User C User B User A Time System Architecture 2008

  9. OFDM vs OFDMA (1) System Architecture 2008

  10. OFDM vs OFDMA (2) System Architecture 2008

  11. (1) MOBILE WIMAX System Architecture 2008

  12. IEEE 802.16e System Architecture 2008

  13. 802.16e Mobile WiMAX Highlights • 16e targeting 1-3 mile radius mobile broadband connection for pedestrians and automobiles. System Architecture 2008

  14. Applications for 16e • According to QoS (Quality of Service) levels, most of applications are covered. Mobile Phone Video Phone Internet System Architecture 2008

  15. Scalable OFDMA service • According to available BW, several FFT sizes are supported. • Table shows an example. System Architecture 2008

  16. Data Rate example • Frame = 10ms • Downlink = 7.5ms • Uplink = 2.5ms • 10MHz Bandwidth 28.29 System Architecture 2008

  17. BW 8.75MHz n 8/7 Sampling Freq 10.000MHz FFT size 1024 DL Null=184, Pilot=120, Data=720 UL Null=184, Pilot=280, Data=560 # of sub-channels DL (2cluster) 30 channel UL (6 tile) 35 channel Sub-carrier space 9.765625KHz Useful Symbol Tb 102.4us Guard Interval Tg 12.8us OFDM symbol Ts 115.2us Symbols in Frame 48(5ms frame) Modulation QPSK,16/64QAM CC DL R=1/2, 2/3, 3/4, 5/6 UL R=1/2, 2/3, 5/6 Repetition x2, x4, x6 Data Channel DL PUSConly UL PUSC only Mobile WIMAX 8.75MHzSPEC System Architecture 2008

  18. Frame Structure System Architecture 2008

  19. Frame • Preamble: PN code of Base Station ID • FCH: frame control header • DL-MAP: detail Downlink information • UL-MAP: detail Uplink infromation • Burst: user data • Sub-Channel: group of sub-carriers • FUSC（downlink fully used subchannelization） • PUSC（Partially used subchannelization） • Advance Modulation and Coding subchannels　（AMC） System Architecture 2008

  20. PUSC (partially used subchannel) Frequency Preamble Preamble Data Pilot cluster Time System Architecture 2008 p 0 1 2 3 4 5 6

  21. 802.16e Transceiver Architecture Bit deinterleave Viterbi derandomize Media Access Control (S/W ) RX Downconversion A/D resample derotator FFT / IFFT equalize permutation demap Repetitiondepuncture AGC TX Upconversion D/A Inter-polator rotator Inv-permutation map Repetition puncture Bit interleave Convolution Coding randomize System Architecture 2008

  22. (2) XG-PHSNEXT GENERATIONPERSONAL HANDYPHONE SYSTEM System Architecture 2008

  23. PHS MoU System Architecture 2008

  24. PHS and XG-PHS System Architecture 2008

  25. System BW 10.0MHz Effective BW 9.0MHz Sampling Freq 19.2MHz FFT size 512 24subcarrier/PRU * 10 PRU 240subcarrier Number of PRU in Frequency axis 10 PRU Sub-carrier space 37.5KHz Useful Symbol Tb 26.67us Guard Interval Tg 1/4(S1)=6.66us 1/8(他)=3.33us OFDM symbol Ts 1/4(S1)=33.33us 1/8(他)=30.00us Frame length 5.000ms 96000 point in 19.2Msps UL/DL 2.5ms SLOT 625us Head Guard 21.67us Burst Time 573.33us Tail Guard 30.00us XG-PHS OFDM TYPE4 10MHz Spec System Architecture 2008

  26. Data Rate example • Frame = 5ms • Downlink =Uplink = 2.5ms • 10MHz Bandwidth • 40PRU (4Cch, 36Ich) for each down/up link • 4 CCH PRU + 36 ICH PRU • CCH: 324 sc * 4=1296sc/2.5ms (BPSK, R=1/2) • ICH: 372sc*36=13392sc/2.5ms • ICH Performance (DL+UL) System Architecture 2008

  27. Time Domain System Architecture 2008

  28. Frequency Domain UL2500us DL2500us Slot650us Low Time SCH 1 PRU1 PRU2 PRU3 PRU4 PRU1 PRU2 PRU3 PRU4 1 SCH is used for Common channelCCH Other SCHs are used for Individual channelICH SCH 2 PRU5 PRU6 PRU7 PRU8 PRU5 PRU6 PRU7 PRU8 SCH 3 PRU9 PRU10 PRU11 PRU12 PRU9 PRU10 PRU11 PRU12 SCH 4 24 subcarrier PRU13 PRU14 PRU15 PRU16 PRU13 PRU14 PRU15 PRU16 SCH 5 PRU17 PRU18 PRU19 PRU20 PRU17 PRU18 PRU19 PRU20 PRU21 PRU22 PRU23 PRU24 PRU21 PRU22 PRU23 PRU24 SCH 6 PRU25 PRU26 PRU27 PRU28 PRU25 PRU26 PRU27 PRU28 SCH 7 PRU29 PRU30 PRU31 PRU32 PRU29 PRU30 PRU31 PRU32 SubChannel SCH SCH 8 PRU33 PRU34 PRU35 PRU36 PRU33 PRU34 PRU35 PRU36 SCH 9 SCH 10 PRU37 PRU38 PRU39 PRU40 PRU37 PRU38 PRU39 PRU40 High Frequency System Architecture 2008

  29. Control Common Channel CCHPRU structure System Architecture 2008

  30. Individual Channel ICHPRU structure System Architecture 2008

  31. CCH and ICH System Architecture 2008

  32. Summary • Next Generation Broadband Wireless Access services are introduced. • OFDMA is key Technology. • New two services coming soon in Japan • Mobile WiMAX (IEEE 802.16e) • XG-PHS • TDD-OFDMA • Several ten’s Mbps similar to WLAN for large area System Architecture 2008

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