Developing AL-ARQ Module for Automatic Measurement of One-Way Data Transmission Delay
DOI:
https://doi.org/10.22213/2413-1172-2020-2-82-90Keywords:
ad-hoc network, ARQ, delay, jitter, UDP, video streaming, QoSAbstract
In different video streaming services and applications in mobile wireless networks, the QoS may not satisfy the users’ desire if the one-way transmission delay (end-to-end delay) and delay variations between hosts are large relative to some threshold values. In this paper, we develop a new module for measuring and investigating a one-way transmission delay, as well as delay jitter for the application layer automatic repeat-request (AL-ARQ) algorithm based on UDP by adapting the protocol header for delay metrics and updating receiver’s playback buffer. We created a standalone network where a microcomputer (Raspberry Pi) sends video streaming to a destination node (HP laptop) using the 802.11g standard. We used the NTP server for time synchronization between end-devices to provide a frame of time reference for delay metrics as well as delay variation (Jitter).
The results showed the importance of the module proposed and its effectiveness in measuring AL-ARQ transmission delay and delay jitter at a high level of accuracy during the requesting and the retransmission of lost packets. It showed that the retransmission mechanism of AL-ARQ algorithm affects both maximum and average values of one-way transmission delay, which increases by increasing in mean packet loss rate and burst length. Moreover, it also showed that the jitter of lost packets is spread more widely than non-lost packs. Although AL-ARQ is still under the requirements of a good video streaming provider for small standalone networks. However, using the results of the module proposed, an adaptive jitter buffer could be implemented to refine the dynamics of the AL-ARQ buffering mechanism and enhance its QoS in more complicated scenarios.References
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