| 摘要 |
<p>PROBLEM TO BE SOLVED: To conduct digital data transmission adopting the high} quality radio system for only specific users. SOLUTION: An internet protocol(IP) packet 32 generated by an IP packet generating section 3 is ciphered by a ciphering section 33 and a medium access control(MAC) frame generating section 36 provides a MAC header to the ciphered packet and generates a MAC frame 37. Then a cyclic redundancy check(CRC) calculation section 38 generates a CRC code and adds it to the MAC frame 37 to generate a MAC frame 39. Then a section generating section 40 generates a section 41 of a moving picture experts group(MPEG)2 and divides it into transport packets 43 and sends the result from a server to a client via a communication satellite.</p> |
