Bandwidth monitoring device
First Claim
1. A bandwidth monitoring device for monitoring a packet bandwidth, comprising:
- a counter residual quantity value determining portion configured to determine a current counter residual quantity value which represents a residual value of a packet length counter value by adding up inputted packet lengths and subtracting outputted packet lengths immediately prior to input of a next input packet; and
a monitoring results determining portion configured to set determination criteria, and to determine in accordance with the determination criteria whether input packets violate or comply with a monitored bandwidth;
wherein the determination criteria include a determination criterion, based on the counter residual quantity value from said counter residual quantity value determining portion, that all input packets are in compliance with a monitored bandwidth when the counter residual quantity value is equal to or less than a first threshold value;
wherein the determination criteria include a determination criterion such that a drop probability, by which a determination is made that input packets violate the monitored bandwidth when the counter residual quantity value exceeds the first threshold value, becomes greater pursuant to increases in the counter residual quantity value; and
wherein the determination criteria include a determination criterion that all input packets violate a monitored bandwidth when the counter residual quantity value exceeds a second threshold value which is greater than the first threshold value.
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Accused Products
Abstract
In one embodiment, a bandwidth monitoring device comprises a packet receiving circuit configured to receive packets; a counter configured to count a total packet length by adding up inputted packet lengths including a packet length of a next input packet and subtracting outputted packet lengths to produce a counted value; a timer configured to time a packet receiving time; a memory configured to store a number of packet receiving times and a number of counted values counted by the counter which correspond to the packet receiving times, respectively; a counter rate-of-change calculating portion configured to calculate a change rate by a first counted value corresponding to an oldest packet receiving time stored in the memory representing an oldest time at which a packet was received and a second counted value corresponding to a latest packet receiving time stored in the memory representing a latest time at which a packet was received; and a determining portion configured to decide whether the next input packet will be discarded based on a probability computed by the change rate and the counted value counted by the counter when the packet receiving circuit receives the next input packet.
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Citations
18 Claims
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1. A bandwidth monitoring device for monitoring a packet bandwidth, comprising:
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a counter residual quantity value determining portion configured to determine a current counter residual quantity value which represents a residual value of a packet length counter value by adding up inputted packet lengths and subtracting outputted packet lengths immediately prior to input of a next input packet; and
a monitoring results determining portion configured to set determination criteria, and to determine in accordance with the determination criteria whether input packets violate or comply with a monitored bandwidth;
wherein the determination criteria include a determination criterion, based on the counter residual quantity value from said counter residual quantity value determining portion, that all input packets are in compliance with a monitored bandwidth when the counter residual quantity value is equal to or less than a first threshold value;
wherein the determination criteria include a determination criterion such that a drop probability, by which a determination is made that input packets violate the monitored bandwidth when the counter residual quantity value exceeds the first threshold value, becomes greater pursuant to increases in the counter residual quantity value; and
wherein the determination criteria include a determination criterion that all input packets violate a monitored bandwidth when the counter residual quantity value exceeds a second threshold value which is greater than the first threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A bandwidth monitoring device for monitoring a bandwidth of either fixed-length or variable-length packets, the bandwidth monitoring device comprising:
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a counter residual quantity value determining portion configured to determine a current counter residual quantity value which represents a residual value of a packet length counter value by adding up inputted packet lengths and subtracting outputted packet lengths immediately prior to input of a next input packet; and
a monitoring results determining portion configured to set determination criteria, and to determine in accordance with the determination criteria whether input packets violate or comply with a monitored bandwidth;
wherein the determination criteria include a determination criterion, based on an added value representing a sum of the counter residual quantity value from said counter residual quantity value determining portion and a packet length of the next input packet, that all input packets are in compliance with the monitored bandwidth when the added value is equal to or less than a first threshold value; and
wherein the determination criteria include a determination criterion such that a drop probability, by which a determination is made that input packets violate the monitored bandwidth when the added value exceeds the first threshold value, becomes greater pursuant to increases in the added value. - View Dependent Claims (12, 13, 14)
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15. A bandwidth monitoring device, comprising:
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a packet receiving circuit configured to receive packets;
a counter configured to count a total packet length by adding up inputted packet lengths including a packet length of a next input packet and subtracting outputted packet lengths to produce a counted value;
a timer configured to time a packet receiving time;
a memory configured to store a number of packet receiving times and a number of counted values counted by said counter which correspond to the packet receiving times, respectively;
a counter rate-of-change calculating portion configured to calculate a change rate by a first counted value corresponding to an oldest packet receiving time stored in said memory representing an oldest time at which a packet was received and a second counted value corresponding to a latest packet receiving time stored in said memory representing a latest time at which a packet was received; and
a determining portion configured to decide whether the next input packet will be discarded based on a probability computed by said change rate and the counted value counted by said counter when said packet receiving circuit receives the next input packet. - View Dependent Claims (16, 17, 18)
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Specification