Abstract
In this paper, we propose a QoS-aware dynamic bandwidth allocation scheme to mitigate congestion problem in gateway-based multi-hop WiFi-based long distance networks and thereby enhance QoS guarantees for real-time traffic. It presents a dynamic slot scheduling scheme which efficiently distributes the unused TDMA time slots among the needy nodes. The distribution process is carried out in a hierarchical manner through the use of parent-child relationship of a tree topology. By doing so, end-to-end performance of real-time traffic is enhanced manifold. Furthermore, the proposed protocol provides assured packet forwarding for already admitted flows by allowing transmission of nodes according to the capacity of ancestral links. Simulation results show that the proposed protocol achieves a significant performance improvement in terms of throughput and delay of real-time traffic.
Highlights
In recent times, WiFi-based Long Distance (WiLD) networks have become very popular in bridging the rural urban digital divide
We have proposed a dynamic Quality of service (QoS)-aware bandwidth allocation scheme, called DQBA, to provision QoS for real-time applications in multi-hop WiLD networks
5 Conclusions In this paper, we have presented a dynamic QoSaware bandwidth allocation scheme for multi-hop WiLD networks which addresses the congestion problem and facilitates QoS support for real-time traffic
Summary
WiFi-based Long Distance (WiLD) networks have become very popular in bridging the rural urban digital divide. We have proposed a dynamic QoS-aware bandwidth allocation scheme, called DQBA, to provision QoS for real-time applications in multi-hop WiLD networks. Unlike the 2P-based MAC protocols, JaldiMAC supports single-hop point-to-multipoint network architecture which relies on loose node synchronization It allows dynamic traffic patterns with varying symmetry ratios to adapt with the asymmetry of Internet traffic and allocates transmission slot based on demands. Queue-MAC [10] is another hybrid protocol which has addressed the issue of burst network traffic by allocating time slots of dynamic size In this protocol, packets coming from the children nodes carry their load information through a special field called queue indicator. IQueue-MAC uses CSMA and TDMA protocols in light and high load situations respectively It integrates a variable namely TDMA period to provide adaptive data transmission based on children node’s queue length. This motivates us in designing a dynamic bandwidth allocation scheme which will ensure end-to-end QoS for real-time traffic
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