ISDB-Tmmにおけるファイルキャスティング放送技術

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(1)情報処理学会研究報告 IPSJ SIG Technical Report. Vol.2010-AVM-71 No.10 2010/12/2. ISDB-Tmm †. †. ‡. †. †. † NTT 239-8536 3-6 ‡ 100-6104 2-11-1 E-mail: †{yamadaakir, matsuoka, kitaharar, hagiwaraj}@nttdocomo.co.jp, ‡[email protected] ISDB-Tmm ( ). ). , ISDB-Tmm, AL-FEC. (. ,. ,. , LDPC. File-Casting Technologies for ISDB-Tmm Akira YAMADA† Hosei MATSUOKA† Tomoyuki OHYA‡ Ryo KITAHARA† and Junichiro HAGIWARA† †Research Laboratories, NTT DOCOMO, Inc. 3-6 Hikarino-oka, Yokosuka-shi, Kanagawa, 239-8536 Japan ‡Technology & Solution Dep., Multimedia Broadcasting, Inc. 2-11-1, Nagata-cho, Chiyoda-ku, Tokyo, 100-6104 Japan E-mail: †{yamadaakir, matsuoka, kitaharar, hagiwaraj}@nttdocomo.co.jp, ‡[email protected] Abstract In the ISDB-Tmm, the File-Casting service (storage-type content delivery service) is provided as well as real-time service. The File-Casting service in the ISDB-Tmm enables a variety of huge multimedia contents files to be delivered to mobile handsets through the broadcasting system effectively. In this paper, we describe overview of the File-Casting technologies. Keyword Multimedia broadcasting, ISDB-Tmm, AL-FEC, File repair, Storage-type content delivery service, LDPC 1. ISDB-Tmm (Integrated Services Digital Broadcasting AL-FEC (Application-Layer. for mobile multimedia) (. ). [1]. Forward Error Correction). FLUTE (File Delivery. over. [6]. Unidirectional. Transport). UDP/IP. Datagram Protocol / Internet Protocol) [7]-[9] (Robust Header Compression) [10]. (User ROHC. ULE (Unidirectional. Light-weight Encapsulation) [11]. PSI/SI. 2. ISDB-Tmm. 1. PES. Section. TS 2. FLUTE/AL-FEC. HTTP. UDP/IP/ROHC. TCP/IP. ULE. ISDB-Tmm. MPEG-2 TS 3G/3.9G. ISDB-T (Integrated Services Digital Broadcasting for Terrestrial). MPEG-2. TS (Motion Pictures Expert Group-2 Transport Stream) PES (Packetized Elementary Stream). 1 ISDB-Tmm. © 2010 Information Processing Society of Japan.

(2) 情報処理学会研究報告 IPSJ SIG Technical Report. Vol.2010-AVM-71 No.10 2010/12/2. ”1” (i-1, i). 1. (1). 3. x1 f1. FLUTE. UDP IP (v4. v6) UDP/IP. ROHC UDP / IP. ULE. 1  0 0  1 0  1 . CRC32. ULE TS. MPEG-2 TS 188Byte. 2. TS. x6. f6. 0 0 1 0 1 1 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 0 0 1 0 0 1 1 0 0 0 0 0 0 1 0 0 1 1 0 1 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 1.  x1     x2  x   3 0   x4    0   x5  0   x6    =0 0   f1  f  0   2  f 1   3  f4    f5  f   6. (1). 3.2. AL-FEC s1. s2. s3. s4. s5. s6. s1. s2. s3. s4. s5. s6. p1. p2. p3. p4. p5. p6. s4. p4. s1. s2. s3. s4. s5. AL-FEC. ISDB-Tmm. s6. i). ii) Reed-Solomon. LDPC-Staircase s1. s3. s4. s3. s2. s1. s5. p2. p4. 1 p6. s6. p2. p1. s5. p5. , iii). 3 TS. p3. ( 3 AL-FEC. ) 4. 95% TS. 3. AL-FEC 1%. Reed-Solomon. LDPC-Staircase. 13%. 8%. LDPC-Staircase. AL-FEC AL-FEC. FEC. 1 Reed-Solomon. AL-FEC. LDPCStaircase. 3 100MBytes. AL-FEC. 940Bytes 0.1%. MPEG-2 TS 5 25%. MPEG-2 TS. 12 24. 10 FEC. 1. 3.1. LDPC-Staircase ISDB-Tmm. ※. 1 1. 3. AL-FEC. LDPC-Staircase(Low Density Parity Check-Staircase)[2]. Reed-Solomon LDPC-Staircase. 0.8 0.6 0.4. LDPC-Staircase. 0.2. 2. 0 0. ”1”. 0.05. 0.1 0.15 TS Packet Error Rate. 0.2. 0.25. 4 © 2010 Information Processing Society of Japan.

(3) 情報処理学会研究報告 IPSJ SIG Technical Report. Vol.2010-AVM-71 No.10 2010/12/2. ULE (Unidirectional Light-weight Encapsulation) [11]. 4. FLUTE. ISDB-Tmm. FLUTE[6] ULE ISDB-Tmm. FLUTE. MPEG-2. Systems. 5. ISDB-Tmm. Ethertype. ROHC. 0x22F1. IEEE (Institute of. Electrical and Electronics Engineers) [12]. 1. TOI (Transport Object. Identifier). 7. 7.1.. TSI (Transport Session Identifier). TSI. PID (Packet Identifier). AL-FEC. MPEG-2 Systems FLUTE FDT (File Delivery Table). (. 6) ISDB-Tmm. 5. UDP/IP/ROHC FLUTE UDP. [7]. IP (v4. v6). [8][9]. 7 UDP. HTTP. IP. Content-Range ISDB-Tmm. ROHC[10]. ROHC. (. HTTP. HTTP. IP ). IP. ). ( UDP/IP ROHC. IPv4. 28. UDP/IP. 1. 6. 6. ULE MPEG-2. IP Systems. ISDB-Tmm. TOI. TOI. File1. File2. AL-FEC. TSI. TOI File3. PID TSI MPEG-2 TS. Files... Files... TSI. Files... TSI. PID. FLUTE. 5. FLUTE. MPEG-2 Systems. MPEG-2 Systems. 7 © 2010 Information Processing Society of Japan.

(4) 情報処理学会研究報告 IPSJ SIG Technical Report. Vol.2010-AVM-71 No.10 2010/12/2. 8% “. [13]. ”. 8. “. ”. ISDB-Tmm. (. ) (. ) ISDB-T. 2012. HTTP. Retry-After [1]. 7.2. UEP. AL-FEC. ISDB-Tmm LDPC-Staircase. UEP (Unequal Error. Protection) LDPC-Staircase ”1”. UEP. FLUTE. FDT FEC-OTI-Scheme-Specific-Info (UEP. ). ”1”. ”1”. (UEP. ). ). (UEP LDPC-Staircase. UEP 15% [13]. 7.3.. ISDB-Tmm. 50%. TS. ,“. ,” 2009 11 [2] V. Roca, C. Neumann, D. Furodet, “Low Density Parity Check (LDPC) Staircase and Triangle Forward Error Correction (FEC) Schemes,” RFC 5170, June 2008. [3] ISO/IEC, “Information technology — Generic coding of moving pictures and associated audio information: Systems 13818-1,” ISO/IEC13818-1, 2000. [4] J. S. Plank, “ A Tutorial on Reed-Solomon Coding for Fault-Tolerance in RAID-like Systems ” , In Software Practice and Experience, Vol.27, pp.995-1012, May 1990. [5] ” ,” MoMuC 2008 11 . [6] T. Paila, M. Luby, R. Lehtonen, V. Roca, R. Walsh, “FLUTE - File Delivery over Unidirectional Transport,” RFC3926, October 2004. [7] J. Postel, “User Datagram Protocol,” RFC768, August 1980. [8] J. Postel, “Internet Protocol,” RFC791, September 1981. [9] S. Deering, R. Hinden, “Internet Protocol, Version 6 (IPv6) Specification,” RFC1883, December 1995. [10] C. Bormann, et al, “RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed,” RFC3095, July 2001. [11] G. Fairhurst, B. Collini-Nocker, “Unidirectional Lightweight Encapsulation (ULE) for Transmission of IP Datagrams over an MPEG-2 Transport Stream (TS),” RFC4326, December 2005 [12] http://standards.ieee.org/regauth/ethertype/eth.txt [13] Hosei Matsuoka, Akira Yamada and Tomoyuki Ohya, “Low Density Parity Check Code Extensions Applied for Broadcast-Communication Integrated Content Delivery,” The 21st International Teletraffic Congress Specialist Seminar on Multimedia Applications - Traffic, Performance and QoE, March 2010.. 7 © 2010 Information Processing Society of Japan.

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