Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Example ·Letu=S-at u utility from file transfer -S satisfaction when transfer infinitely fast t=transfer time a rate at which satisfaction decreases with time As transfer time increases,utility decreases If t>S/a,user is worse off!(reflects time wasted) Assumes linear decrease in utility S and a can be experimentally determined 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.102616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.10 Example • Let u = S - a t - u = utility from file transfer - S = satisfaction when transfer infinitely fast - t = transfer time - a = rate at which satisfaction decreases with time • As transfer time increases, utility decreases • If t > S/a, user is worse off! (reflects time wasted) • Assumes linear decrease in utility • S and a can be experimentally determined