| US 7,542,430 B2 | ||
| System and method for measuring end-to-end network delay and user-perspective delay | ||
| Lisan Lin, Plano, Tex. (US); Michael Reiman, Plano, Tex. (US); Mark Chen, Carrollton, Tex. (US); and Charles Moore, Plano, Tex. (US) | ||
| Assigned to Tektronix, Inc., Beaverton, Oreg. (US) | ||
| Filed on Jan. 13, 2005, as Appl. No. 11/35,145. | ||
| Prior Publication US 2006/0153091 A1, Jul. 13, 2006 | ||
| Int. Cl. G01R 31/08 (2006.01); G06F 11/00 (2006.01); G08C 15/00 (2006.01); H04J 1/16 (2006.01); H04J 3/14 (2006.01); H04L 1/00 (2006.01); H04L 12/26 (2006.01) | ||
| U.S. Cl. 370—252 [370/324; 370/335; 370/395.1] | 17 Claims |
| 1. A method for measuring network delay in an IP network, comprising:
detecting request and corresponding transport acknowledgement messages at a monitoring point device, said monitoring point
device disposed at an interface between a wireless network and the IP network;
calculating an uplink network delay based upon the time elapsed between detections of the request and transport acknowledgement
messages at the monitoring point device;
detecting response and corresponding transport acknowledgement messages at the monitoring point device, wherein the response
message is sent in response to the request message;
calculating a downlink network delay based upon the time elapsed between detections of the response and transport acknowledgement
messages at the monitoring point device; and
calculating an end-to-end network delay by averaging a sum of the uplink and downlink delays, wherein the end-to-end network
delay represents a time required for an IP message to travel from a user device to network destination.
|