Improved Priority Aware Mechanism for Enhancing QoS in MANET

• Published in: Wireless personal communications Vol. 122; no. 1; pp. 277 - 292
• Main Authors: Nallayam Perumal, Mohan Prabhu, Selvi, C. S. Kanimozhi
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Communications Engineering; Computer Communication Networks; Data integrity; Data loss; Delay; Engineering; Networks; Signal,Image and Speech Processing; Simulation; Streams; Video on demand; MANET; Admission control; Improved priority aware mechanism; AODV; Quality of service; Bandwidth estimation
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-021-08898-y

Priority Aware mechanism utilizing connection-oriented approach doesn't offer uniform throughput and low end-to-end delay when the velocity of mobile nodes is extended beyond 2 m/s. On the other hand, when a connection-less approach is utilized, it offers significantly less QoS to the admitted streams when compared to the connection-oriented approach. Hence it is unsuitable for non-data loss and delay sensitive application. In this paper, an improved priority aware mechanism is proposed and incorporated over the standard Ad hoc On-Demand Distance vector routing protocol (IPA-AODV) to address the aforesaid issue. In IPA-AODV, if any forwarding node's velocity is more than velocity threshold, it is restricted to participate in the routing process. Further, when the aggregate value of active streams bandwidth utilization exceeds the data rate threshold low precedence stream will be suspended. For experimental setup, five contending streams of TCP connection and CBR traffic are chosen in ns2, which explicitly express their data rate and with distinct precedence value to simulate the behavior of non-data loss applications such as financial applications. In another trial, UDP connection is given highest precedence along with CBR traffic to simulate the behavior of delay-sensitive applications such as VOIP, Video on Demand (VoD) etc. From the simulation outcomes, IPA-AODV outflanks AODV and PA-AODV protocol concerning throughput, packet delivery ratio (PDR), and end-to-end delay (EED). IPA-AODV offers 4.5% average increase in throughput when compared with AODV, 78.08% and 156.77% reduction in average end-to-end delay and 0.075% and 0.19% average increase in PDR when compared with PA-AODV and AODV respectively.