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Software-defined networking (SDN) is a promising future network architecture which introduces new dimensionsin flexibility and adaptability to cope with different Quality of service (QoS) metrics, such as latency constraint, loss rate, etc. In this paper, we provide differentiated Services for flows of a topic-oriented publish/subscribe system to address some of the QoS guarantee issues, by leveraging...
With global coverage abilities, satellite networks are expected to provide users with ubiquitous data services. However, routing in satellite networks faces more challenges due to the satellite movement. Fortunately, the satellite movement can be predicted by orbit calculation. Based on this characteristic, a lot of existing routing algorithms use Temporal Graph Model (TGM) to calculate instantaneous...
This paper studies the optimization of a multi-period survivable network augmentation (MPSNA) problem. An integer linear programming (ILP) model is formulated. Because the MPSNA problem is very time-consuming to solve even for a very small network, a four-stage ILP-based heuristic approach is developed. Simulations on six test case networks of various sizes are carried out. The experimental results...
The majority of the routing protocols designed to date for mobile ad hoc networks (MANET) rely on flooding of route requests for the establishment of routes on demand. A novel approach called CBORCA (Cut-Based On-demand Routing with Coordinate Awareness) is introduced. CBORCA improves the efficiency with which route requests are disseminated by partitioning the designated route forwarders in distinct...
An innovative cross-layer routing approach, MCORCA (Multi-Channel On-demand Routing with Coordinate Awareness), is presented that utilizes multiple channels to improve the performance of wireless ad-hoc networks. The proposed cross-layer scheme adapts the strategy of channel assignment and the mechanism of dealing with conflicts. Channels are divided into a control channel and data channels; the control...
We introduce ORTHCA (On-demand Routing with Two Hop Coordinates Awareness) a method for minimizing the dissemination of route requests in mobile ad hoc networks (MANET). The selection of relaying nodes is implemented by first computing the best two-hop relay nodes R2(u) whose Euclidean Distance to four polar points are the shortest among all two-hop neighbors N2(u), and then determining one-hop relay...
Flooding of route requests or link states is a necessity in many routing protocols for mobile ad hoc networks (MANET), and several mechanisms have been devised to make flooding more efficient; however, all flooding approaches to date are such that the number of neighbors each node must use to relay a flooded packet grows as the node density increases. A new method, called ORCA (On-demand Routing with...
The majority of the routing protocols designed and implemented to date for mobile ad hoc networks (MANET) rely on flooding of route requests for the establishment of routes on demand, flooding of topology information, or the hop-by-hop dissemination of distances or paths for each destination. The signaling overhead incurred with these strategies consumes excessive amounts of the scarce bandwidth available...
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