For the Internet phone example in Section 7.3, we introduced an online procedure (exponential moving average) for estimating delay. In this problem we will examine an alternative procedure. Let '; be the timestamp of the ith packet received; let r; be the time at which the ith packet is received. Let d n be our estimate of average delay after receiving the nth packet. After the first packet is received, we set the delay estimate equal to d l =1'1 - '1 a. Suppose that we would like d =(r n l - f I + r2 - f2 + . . . + r" - ',,)In for all n. Give a recursive formula for d" in terms of d ll _ l , rn, and 'n '
b. Describe why for Internet telephony, the delay estimate described in Section 7.3 is more appropriate than the delay estimate outlined in Part a.