Patent Number: 7,787,374

Title: Derivative packet delay variation as a metric for packet timing recovery stress testing

Abstract: A method and system for analyzing simulated packet delay variation (PDV) using derivative PDV is disclosed. The delay-step method for simulating PDV determines a delay for each packet in a stream of packets generated at a regular interval. Delay target values are randomly selected based on a statistical distribution, such as a Gaussian distribution. Delay-steps are determined for each packet based on the delay target values. The delay-steps can be fixed or variable sized steps which are used to adjust the delay of sequential packets. PDV is generated by delaying each of the packets with the delay determined for that packet. The derivative PDV is calculated to evaluate a delay rate of change on a packet-by-packet basis. The derivative PDV can be used as a metric to specify stresses for adaptive packet timing recovery stress testing.

Inventors: Bedrosian; Paul Stephan (Andover, MA)

Assignee: Agere Systems Inc.

International Classification: H04L 12/28 (20060101)

Expiration Date: 8/31/12018