| Presentation | 2006-09-14 A Conditional Access System Using Broadcasting for Narrow-band Mobile Broadcasting Systems Yusei NISHIMOTO, Satoshi FUJITSU, Shunji SUNASAKI, Takeshi KIMURA, Hiroyuki IMAIZUMI, Yoshihiro FUJITA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A Conditional Access System (CAS) is essential for controlling digital content usage in narrow-band broadcasting such as terrestrial 1-segment broadcasting and digital audio broadcasting. This paper assumes that broadcasting receivers means not only mobile phones but also mobile receivers without two-way communication functions, such as mobile receivers for use in motor vehicles and portable receivers used in combination with personal digital assistants (PDAs) and portable game stations. A CAS provides a mechanism to restrict broadcasting reception and content playback to only subscribers. Here, contract information must be distributed to each and every receiver to distinguish between subscribers and non-subscribers, and this must be done by broadcasting in the case of mobile receivers without two-way communication functions. In B-CAS for digital satellite broadcasting, the system broadcasts contract information in this way. This, however, requires a wide transmission band of about 300 kbps to transmit contract information for individual receivers, which means that the current technology for distributing contract information by B-CAS cannot be applied to narrow-band broadcasting. In older to resolve this problem, we have developed a new CAS that is capable of transmitting contract information even for narrow-band broadcasting. This paper describes the operation scheme used to calculate the transmission rate of contract information when applying this system. We also clarify by security evaluation and evaluation of implementation that the proposed CAS can be applied to actual services. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | terrestrial 1-segment broadcasting / digital audio broadcasting / narrow-band broadcasting / conditional access / access control / contract information |
| Paper # | MoMuC2006-43 |
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| Conference Information | |
| Committee | MoMuC |
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| Conference Date | 2006/9/7(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Mobile Multimedia Communications(MoMuC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Conditional Access System Using Broadcasting for Narrow-band Mobile Broadcasting Systems |
| Sub Title (in English) | |
| Keyword(1) | terrestrial 1-segment broadcasting |
| Keyword(2) | digital audio broadcasting |
| Keyword(3) | narrow-band broadcasting |
| Keyword(4) | conditional access |
| Keyword(5) | access control |
| Keyword(6) | contract information |
| 1st Author's Name | Yusei NISHIMOTO |
| 1st Author's Affiliation | NHK Science & Technical Research Laboratories() |
| 2nd Author's Name | Satoshi FUJITSU |
| 2nd Author's Affiliation | NHK Science & Technical Research Laboratories |
| 3rd Author's Name | Shunji SUNASAKI |
| 3rd Author's Affiliation | NHK Science & Technical Research Laboratories |
| 4th Author's Name | Takeshi KIMURA |
| 4th Author's Affiliation | NHK Science & Technical Research Laboratories |
| 5th Author's Name | Hiroyuki IMAIZUMI |
| 5th Author's Affiliation | NHK Science & Technical Research Laboratories |
| 6th Author's Name | Yoshihiro FUJITA |
| 6th Author's Affiliation | NHK Science & Technical Research Laboratories |
| Date | 2006-09-14 |
| Paper # | MoMuC2006-43 |
| Volume (vol) | vol.106 |
| Number (no) | 245 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |