| 摘要 |
PURPOSE:To improve the transmission efficiency, by assigning channels fixedly to devices having a large quantity of transmission data and allowing devices having a small quantity of transmission data to use channels in common. CONSTITUTION:Assuming that three devices NO1-NO3 have a large quantity of transmission data and six devices NO4-NO9 have a moderate quantity of transmission data and eight devices NO10-NO17 have a small quantity of transmission data, channels are distributed in accordance with the data quantity as shown in a table 1. A subnumber is added to the number of the data channel used by each transmitting device and is defined as the identification number of this transmitting device, and identification numbers of respective transmitting devices are shown in a table 2. Consequently, a controller inserts subnumbers to respective frame areas when a control channel passes local stations, and respective transmitting devices detect channels assigned to their own stations, and thus, data is transmitted efficiently. |
