[ns] how to schedule several events with one timer

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Hi guys,

Say i have a PacketQueue object contains several packets which sent at
the same time, and may  have different transmission time with each
other. Now i want to define a timer, to receive these packets. (i.e.
to simulate transmission delay)

More specifically, say, there are packets A, B, C, D in the queue,
they have transmission time as follows: 1sec, 1sec, 2sec and 3sec. So
i want the timer expires at 1 sec later twice~

I've read NS2 manual, however time-handler class can only schedule one
event each time, if there still is an event scheduled, it will cancel
it, which is not what i want. Can anybody help me figure this out?

-- 
Best regards,
Li Ye