A CDMA Data Measurement and Analysis Tool

We present DQoS (Data Quality-of-Service), a tool for measuring and analyzing CDMA data services. For a wireless connection, DQoS collects traces at its two endpoints and at multiple layers including application, IP, TCP, PPP and physical layers. It then synchronizes these traces and aggregates the information to produce graphical plots that illustrate throughput, latencies, protocol (e.g. TCP) behavior and bad events. DQoS provides a comprehensive view of the connection performance from an end-to-end perspective. It allows us to correlate behaviors at different network layers and troubleshoot potential problems. We have been using DQoS internally at Lucent Technologies for testing and performance validation. DQoS requires no instrumentation internally within the wireless network. Therefore, it can also be used for comparing different CDMA technologies (e.g. EVDO vs UMTS) as well as networks operated by different service providers.