| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication system, a communication controller, and a communication terminal device which enable a plurality of communication terminal devices using the same band to perform radio communication without interference. <P>SOLUTION: A slave machine control part 11 refers to a priority channel table stored in a priority channel memory when establishing communication to a master machine 2. A radio channel having the highest priority level is assigned as an initial channel, and a connection request signal is transmitted from a communication part 15 to the master machine 2 in the frequency band of the initial channel. In the case that frequency bands of radio channel being used by other slave machines or a frequency band being used by a PC 4 interfere with the initial channel, the radio channel overlapping the frequency bands is avoided, and a radio channel of a frequency band having the next highest priority level is selected. When a radio channel for communication already established to the master machine 2 is changed, radio channels being used by other slave machines and radio channels of frequency bands overlapping the frequency band being used between a router device 3 and the PC 4 are avoided to select a radio channel of a frequency having the next highest priority level. <P>COPYRIGHT: (C)2003,JPO</p> |
