| 摘要 |
PROBLEM TO BE SOLVED: To obtain high reliability even when a channel whose receiving sensitivity is low or a channel affected by disturbing radio waves is present by re- transmitting the same data by using all the frequency channels or plural frequency channels of a frequency hopping pattern. SOLUTION: Channels to be used for frequency hopping are set as 26ch ranging from, for example, 71ch of 2.471 GHz to 96ch of 2.496 GHz, and a hopping pattern is fixed in the order of 71ch, 72ch,...95ch, and 96ch, and frequencies (channels) are repeatedly switched according to this hopping pattern. Then, one data packet is transmitted to all the 71ch, 72ch,..., 95ch, and 96ch of the hopping pattern. The same data are transmitted to specific plural frequency channels according to the situation of the receiving sensitivity. Thus, data transmission whose reliability is high can be attained without deteriorating data transmission efficiency so much in a simple re-transmission method. |
