(→TCP congestion control over a live UMTS network [http://c3lab.poliba.it/images/2/21/Umts_tcp_stacks_170407.pdf]) |
(→TCP congestion control over a live UMTS network [http://c3lab.poliba.it/images/2/21/Umts_tcp_stacks_170407.pdf]) |
||
Riga 21: | Riga 21: | ||
# the UMTS downlink channel utilization is poor in the single flow case because of the joint effect of the very high number of retransmissions and the inflated RTT due to queuing. | # the UMTS downlink channel utilization is poor in the single flow case because of the joint effect of the very high number of retransmissions and the inflated RTT due to queuing. | ||
− | + | We report cumulative distribution function plots: | |
* [[Tcp_over_Umts:goodput_downlink | downlink]] and uplink channel goodput CDFs | * [[Tcp_over_Umts:goodput_downlink | downlink]] and uplink channel goodput CDFs | ||
* downlink and uplink RTT and Queuing time CDFs | * downlink and uplink RTT and Queuing time CDFs |
We have performed an extensive campaign of measurements that involved around 3000 flows and more than 40 hours of measurements using three different TCP stacks:
The experimental evaluation has been carried out by accessing the public Internet using an UMTS card (see figure below).
The following instantaneous variable measurements have been collected by using the libnetmeas library:
The main findings of the investigation can be summarized as follows:
We report cumulative distribution function plots:
We have performed an extensive campaign of measurements that involved around 3000 flows and more than 40 hours of measurements using three different TCP stacks:
The experimental evaluation has been carried out by accessing the public Internet using an UMTS card (see figure below).
The following instantaneous variable measurements have been collected by using the libnetmeas library:
The main findings of the investigation can be summarized as follows:
We report cumulative distribution function plots: