CONTROLLED CSMA PACKET SWITCHING SYSTEM

摘要

PHN 12.299Abstract:"Controlled CSMA packet switching system."A controlled CSMA packet switching system of a non-persistent carrier type in which in the event of a channel being sensedbusy, a new sensing point is scheduled at random in a dynamicallydetermined time interval TSn whereTSn = where TSU is the scheduling time interval that maximises the expectedthroughput when all the stations compete for the channel access, TS1is the scheduling time interval that maximises the expected throughputwhen two stations compete for the channel access, TSn-1 is ascheduling time interval determined in a preceding (n-1)th observationinterval, Gn-1 is the average offered load in the (n-1)th observationinterval, and Go is a nominal average offered load.An estimation of the average offered load Gn-1 isderived from an estimation of the average idle period length in the(n-1) observation interval. Three strategies for obtaining such anestimation when a station participates to at least one transmissionin the observation interval are disclosed.