| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronization method of easily synchronizing the operation clock of a radio base station with an Internet communication method. SOLUTION: A plurality of IP-adaptors (ADP) 13 are connected through an LAN 12 to an (IP-) private branch exchange (PBX) 11 with an Internet communication system, and a plurality of radio base stations (BS) 14 and one clock device (CLKE) 16 are connected to the IP-adaptor (ADP) 13. A clock device (CLKE) 16 generates a clock of 200 Hz by using incoming information 18 to be received every 1.2 second from a public PHS base station (CS) 17 existing in the shortest distance as a reference clock, and supplies the clock through the IP-adaptor (ADP) 13 to the radio base station (BS) 14. All the radio base stations (BS) 14 communicate with a simple mobile phone (PS) 15 by synchronizing a radio frame of 5 ms with the clock of 200 Hz. COPYRIGHT: (C)2009,JPO&INPIT
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