Quality of Outcome is a network performance metric. QoO scores are calculated by comparing network measurements to application requirements. The network measurements are Quality Attenuation measurements as specified in TR-452.1 from the Broadband Forum, but excluding the computation of G, S, and V.

TR-452.1 can be found here: https://www.broadband-forum.org/pdfs/tr-452.1-1-0-0.pdf

This tool can:

• Compute Quality Attenuation summaries from latency and packet loss measurements
• Compute Quality of Outcome scores, and several other performance metrics such as RPM

How to use:

1. Create a sqa_stats data structure and add latency and packet loss samples.
2. Calculate RPM, QoO, or any of the other quality metrics.

struct sqa_stats *stats = sqa_stats_create(); //SQA is short for Simple Quality Attenuation

//Add sample(s)
struct timespec measured_delay;
measured_delay.tv_sec = 0;
measured_delay.tv_nsec = 200 * 1000 * 1000; // 200ms
sqa_stats_add_sample(stats, &measured_delay);

//Compute statistics
struct simple_NR_list *nr = create_network_requirement();
double qoo = sqa_stats_get_qoo(stats, nr);
double rpm = sqa_stats_get_rpm(stats);

//Clean up
free(nr);
sqa_stats_destroy(stats);

Install compiler, build and test tools:

    apt install cmake
    apt install build-essential
    apt install libcmocka-dev

Clone the repository with submodules:

    git clone git@github.com:domoslabs/qoo-c.git --recurse-submodules

    (or, if you forget to use --recurse-submodules):

    git clone git@github.com:domoslabs/qoo-c.git
    git submodule update --init 

Build:

    cd qoo-c
    mkdir build
    cd build
    cmake ..
    make

The authors would like to thank Neil Davies, Peter Thompson, Jonathan Newton, Gavin Young, Al Morton, Greg Mirksy and David Sinicrope for their work on QED in the Broadband Forum, and Hans Petter Dalsklev, Karl Kalvik, Knut Joar Strømmen and Len Ciavattone for their contributions to the code.