First In First Out (FIFO) And Priority Packet Scheduling Based On Type Of Service (TOS)

Erac Ombati Momanyi, V. K. Oduol, S. Musyoki


Mobile Ad Hoc Networks (MANETs) require prudent resource allocations especially in scheduling mechanisms that manage buffering of packets during waiting time. Various scheduling algorithms may be implemented to govern packet transmission and control packet loss hence managing the Quality of Service (QoS). Such mechanisms include first-in-first-out (FIFO), priority queuing (PQ), and weighted-fair queuing (WFQ). In this research paper, a comparison is made between FIFO and PQ mechanisms in a mixed traffic scenario (HTTP, FTP and VoIP applications). PQ is implemented on the basis of packet Type of Service (ToS), with VoIP data packets being given the upper hand. OPNET simulator is utilized in this paper. The study has been carried out on some issues like: Traffic dropped Traffic Received and packet end to end delay and the simulation results shows that WFQ technique has a better-quality than the other techniques.

Keywords: MANETS, QoS, PQ, FIFO, Queuing, ToS, OPNET

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ISSN (Paper)2224-5782 ISSN (Online)2225-0506
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