| 摘要 |
PURPOSE:To secure prescribed loss probability by raising a threshold when an interference signal level is higher than the threshold in all radio lines, and lowering the threshold when the difference of a target signal level and an interference signal level is less than a value required for communication even if there is the radio channel which comes less than the threshold. CONSTITUTION:When there is a connection request, a codeless telephone set sets the radio channel, measures the interference signal level U in a level measurement instrument 11, compares it with the threshold T of a carrier sense and sets the subsequent radio channel when U is larger than T. When it is judged that the radio lines cannot be used to the last, the threshold is increased by alpha. Consequently, the threshold is set to the value corresponding to the distribution density of a system. |
