Evaluation and Comparison of Real-time Network Latency

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Presentation transcript:

Evaluation and Comparison of Real-time Network Latency Phillip Marlow KoolSpan Inc. TJHSST Computer Systems Lab

What is Network Latency?

How is Data Transported? Link Layer General Packet Radio Service (GPRS) Ethernet Wifi Internet Layer Internet Protocol (IP) Transport Layer Transmission Control Protocol (TCP) User Datagram Protocol (UDP) Application Layer Security (KoolSpan TrustChip) Message Packing

What Causes Network Latency? Collisions Ordering Encryption/Decryption Packing/Unpacking Link Internet Transport Application Speed of Light Routing

Why Does Network Latency Matter? User Experience Delays on voice data are especially noticeable Excellent < 300 ms Good < 600 ms Poor < 900 ms Unacceptable > 900 ms

How is Network Latency Measured?

How is Network Latency Measured? SYN

How is Network Latency Measured? ACK

Link Layer

Transport Layer

Application Layer

Results GPRS is unfit for voice communication UDP is faster than TCP Security doesn't make a serious impact on overall latency

Suggestions for Future Research 3G Network Time of Day Network Load

Evaluation and Comparison of Real-time Network Latency Special Thanks To: Anthony Fascenda - KoolSpan Inc Randy Latimer - TJHSST Matthew Pearce - TJHSST