SUMMARYThe problem of fair distribution of available bandwidth among traffic flows or aggregates remains an essential issue in computer networks. This paper introduces a novel approach, called the Exact Bandwidth Distribution Scheme (X-BDS), for dynamic and fair distribution of available bandwidth among individual flows. In this approach, the edge routers keep per-flow information, while the core routers maintain the aggregate flow requirements. The X-BDS approach employs a distributed message exchange protocol for providing network feedback and for distributing aggregate flow requirements among the nodes in the network. Based on the obtained feedback, the edge routers employ the X-BDS resource management unit to dynamically distribute available bandwidth among individual flows. The X-BDS admission control and resource management units are responsible for fair resource allocation that supports minimum bandwidth guarantees of individual flows. This paper evaluates the Bandwidth Distribution Scheme through simulation and shows that the X-BDS is capable of supporting per-flow bandwidth guarantees in a dynamically changing network environment.
-Location-aided routing (LAR) is a mechanism which attempts to reduce the control message overhead of Ad-hoc ondemand distance vector (AODV) routing protocol by flooding only the portion of the network that is likely to contain the route to destination. LAR takes advantage of Global Positioning System (GPS) coordinates to identify a possible location of the destination node. Based on this information, LAR defines a portion of the network which will be subject to the limited flooding, thus reducing the total number of the control packet traveling through the network during the route discovery process. GeoAODV is a variation of the AODV protocol which like LAR also employs GPS coordinates to limit the search area used during the route discovery process. However, unlike LAR, GeoAODV does not make the assumption that every node in the network knows the traveling speed and location of the corresponding destination node. Instead, GeoAODV tries to dynamically learn and distribute location information among the nodes in the network. This paper examines and compares through simulation the performance of AODV, LAR, and GeoAODV protocols under different environmental settings.
The current best effort approach to Quality of Service in the Internet can no longer satisfy a diverse variety of customer service requirements, because of which there is a need for alternative strategies. A promising approach for dealing with this problem is a method called Load Distribution Scheme (LDS) which dynamically adjusts traffic load at the network boundary based on feedback from the network. In order to fairly share available resources among individual flows, the load distribution scheme relies on a message exchange protocol which in certain cases may cause significant overhead in the system. In this paper, we examine the issues related to the problem of the message overhead in the LDS, propose solutions to the problem, and evaluate these solutions through simulation in OPNET.
This paper provides a summary of our research study of the location-aided routing protocols for mobile ad hoc networks (MANET). This study focuses on the issue of using geographical location information to
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