Therefore, messages removed from the input queues of links in Rj, (1 < j < q), or S2 may require special treatment. The condition for generating or passing through a carrier-null message is that the arrival time of the next possible real message with respect to a processed protocol message has to be greater than the minimum value of all input link-clocks Tini. If a protocol message is removed from the input queue of link (h, i), then this arrival time is referred to as Next.Tinhi which specifies the arrival time of the next possible real message ¿from the input queues other than the one corresponding to (h, i). Therefore, it gives an initial estimation of the possible improvement on lookahead. It is calculated as follows:If link (h, i) belongs to Rm
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