| 摘要 |
<p>PURPOSE:To obtain stable communication by using the slot aloha system so as to provide privilege procedure to re-transmission data in the satellite communication system of common access channel. CONSTITUTION:In the satellite communication network in which a master station C and plural slave stations R are connected as a star, a common access channel via the satellite S is used to allow plural slave stations R to access the master station C at random. When a re-transmission number of times exceeds a threshold level, the transmission power of the transmission packet is increased by each slave station and the master station receives a transmission packet from s slave station with a high signal intensity with priority. Furthermore, each slave station has a counter storing number of re-transmission packets having no acknowledge from the master station and when the count exceeds a threshold level, data are only subject to buffering and the transmission is suppressed till the count reaches a threshold level or below to avoid the congestion.</p> |
