Research on single flow end-to-end delay upper bound in WSN

Present research shows that the single flow end-to-end delay upper bound got by separate flow analysis(SFA) me-thod is sometimes greater than the bound of total flow by total flow analysis(TFA) method in WSN,which is out of physical meanings.Aiming at the above problem,this paper firstly analyzed the difference in data flow's service allocation mechanism between current TFA and SFA,with pointing out that the delay bounds got by these two methods were incomparable.Finally,on the basis of the improved output bound of a data flow traversing a node,it deduced the expression of single flow end-to-end delay upper bound,which accorded with the data flow's service allocation mechanism of TFA.Both of the derived expression and numerical results illustrate that the single flow end-to-end delay upper bound got in this paper,which can be bounded by the bound of total flow by TFA,is physically significant and more accurate.