udt.receiver
Class PacketPairWindow

java.lang.Object
  udt.util.CircularArray<Long>
      udt.receiver.PacketPairWindow

public class PacketPairWindow
extends CircularArray<Long>

a circular array that records time intervals between two probing data packets. It is used to determine the estimated link capacity.

See Also:

CircularArray}

Field Summary

Fields inherited from class udt.util.CircularArray

circularArray, haveOverflow, max, position

Constructor Summary

PacketPairWindow(int size)
construct a new packet pair window with the given size

Method Summary

double	computeMedianTimeInterval() compute the median packet pair interval of the last 16 packet pair intervals (PI).
long	getEstimatedLinkCapacity() compute the estimated linK capacity using the values in packet pair window

Methods inherited from class udt.util.CircularArray

add, size, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PacketPairWindow

public PacketPairWindow(int size)

construct a new packet pair window with the given size

Parameters:

size -

Method Detail

computeMedianTimeInterval

public double computeMedianTimeInterval()

compute the median packet pair interval of the last 16 packet pair intervals (PI). (see specification section 6.2, page 12)

Returns:

time interval in microseconds

getEstimatedLinkCapacity

public long getEstimatedLinkCapacity()

compute the estimated linK capacity using the values in packet pair window

Returns:

number of packets per second