OneProbe is a new method for measuring a non-cooperative path’s quality. The measurement is conducted in one or more concurrent TCP connections by an endpoint of the path under measurement. The main novelty is the capability of measuring, in addition to round-trip time, unidirectional packet loss rate, packet reordering rate and capacity from the same packet-pair probes. Other advantages include

 • Traversing most of the middleboxes placed before web servers in the Internet,

 • Measuring the path quality experienced by legitimate data packets (not control packets),

 • Allowing users to configure the packet size for the probe and response packets, and

 • Allowing users to configure a high sampling rate and different sampling patterns.

More details here.

Application Examples

1. Collaborative network monitoring: Use a number of distributed OneProbe deployments to monitor and diagnose the same set of network paths. More details here

2. Novel asymmetric capacity measurement: Implement novel methods for measuring the capacity for both downlink uplink of an asymmetric broadband connection. More details here

3. Loss-pair measurement: Implement the loss pair method to study the correlation between packet loss and the lost packet’s round-trip time and other useful information. More details here

4. Measuring the impact of submarine cable faults: Capture the (in)direct impact of submarine cable faults on the end-to-end path performance. The ISPs’ responses to such faults can also be observed. More details here

Recent Publications

1. Ricky K. P. Mok, Xiapu Luo, Edmond W. W. Chan, and Rocky K. C. Chang, "QDASH: A QoE-Aware DASH System", Proc. ACM Multimedia Systems Conf., Feb. 2012.

2. Edmond W. W. Chan, Ang Chen, Xiapu Luo, Ricky K. P. Mok, Weichao Li, and Rocky K. C. Chang, "TRIO: Measuring Asymmetric Capacity with Three Minimum Round-Trip Times", Proc. ACM CoNEXT Conf., Dec. 2011.

3. Ang Chen, Edmond W. W. Chan, Xiapu Luo, and Rocky K. C. Chang, "An Integrative Multi-level Analysis of Internet Path Changes", Poster in Proc. ACM CoNEXT Conf., Dec. 2011.

4. Edmond W. W. Chan, Xiapu Luo, Rocky K. C. Chang, Waiting W. T. Fok, and Weichao Li, "Non-cooperative Diagnosis of Submarine Cable Faults", Proc. PAM 2011, March 2011.  [Paper]

5. Ricky K. P. Mok, Edmond W. W. Chan, and Rocky K. C. Chang, "Improving TCP Video Streaming QoE by Network QoS Management", Proc. IEEE/IFIP IM (Pre-conf Session), May 2011.  [Paper]

6. Weichao Li, Waiting W. T. Fok, Edmond W. W. Chan, Xiapu Luo, Rocky K. C. Chang, "Planetopus: A System for Facilitating Collaborative Network Monitoring", Proc. IEEE IM (Application Session), May 2011.  [Paper]