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A hybrid electro-optic router is attractive, where packet buffering and table lookup are carried out in electrical domain and switching is done optically. In this paper, we propose a load-balanced optical switch (LBOS) fabric for a hybrid router. LBOS comprises N linecards connected by an N-wavelength WDM fiber ring. Each linecard i is configured to receive on channel λi. To send a packet, it can...
The aviation community is in the process of designing the next generation Aeronautical Telecommunications Network (ATN), based on Internet standards, to provide air- ground communications for the aircraft. Support for mobile networks in the current Internet architecture is provided by the NEtwork Mobility (NEMO) protocol. As currently defined, NEMO Basic Support protocol lacks of Route Optimization...
This paper presents a tabu search meta-heuristic to solve the static manycast routing and wavelength assignment problem (MA-RWA). The problem is to route a set of manycast requests over a wavelength-routed WDM network such that the number of wavelengths required is minimized. We present the details of a tabu search meta-heuristic for this problem and compare it to two other MA-RWA heuristics called...
Due to the limited energy supplies of nodes, in many applications like wireless sensor networks, energy-efficiency is crucial for extending the networks lifetime. We study the routing problem for multihop wireless ad hoc networks based on cooperative transmission. The source node wants to transmit messages to a single destination. Other nodes in the network may operate as relay nodes. In this paper,...
The Airborne Internet is envisioned to be a large scale multihop wireless mesh network of commercial passenger aircraft connected via long range highly directional air-to-air radio links. We propose a localized geographic load sharing technique to mitigate congestion in this network, taking into account the underlying link scheduling constraints with directional antennas. When forwarding packets for...
Recent years have seen an increasing need of wireless networks in a mobile environment serving for more complex tasks and applications. Mobility becomes an indispensable factor of the system design and has been widely recognized as a general cause of packet loss. Though many works have been done on mobility study, to the best of our knowledge, they are mainly based on simulations or analytical studies...
Due to the uncertainty of transmission opportunities between mobile nodes, Delay Tolerant Networks (DTN) routing exploits the opportunistic forwarding mechanism. Optimal policies for opportunistic forwarding are crucial to maximizing the message delivery probability while reducing the forwarding cost. In this paper, we investigate the optimal opportunistic forwarding policies for the energy- constrained...
Among the route optimization schemes in NEtwork MObility (NEMO), the prefix delegation-based schemes perform better than other schemes. Since the prefix delegation-based schemes are designed for communication between a mobile network and a wired network, they lack evaluation for the case of intra mobile network communication involving MIPv6 incapable hosts in a mobile network. We evaluate prefix delegation-based...
In this paper, we propose a DDoS defense architecture, named NEIF (Network Egress and Ingress Filtering), which is deployed at the Internet Service Provider's (ISP) edge routers to prohibit DDoS attacks into and from the ISPs' networks. The main challenge is how to implement NEIF with a small fixed amount of memory and low implementation complexity so that it may be acceptable by ISPs. We first design...
This paper estimates the feasibility of operating field sensors using otherwise unwanted radio frequency (RF) energy in a wireless ad hoc sensor network. In the traditional concept, an exposed node is kept from any communication activities during a neighbor's transmission. To save energy, the node may go to sleep mode during its inactivity period. In contrast, it is proposed that whenever a node is...
In this paper, we use matrix games framework for joint optimization of routing and network coding under conflict free scheduling for multi-source wireless ad-hoc networks. The impact of multicast diversity on scheduling is controlled by using topology compression concept quantified through compressed multicast topology matrix. To define topology matrix, first a set of all possible paths, including...
Traditional protection schemes guarantees 100% reliability in case of single link failure which demands resources while differentiated reliability provides a granular protection scheme. Moreover, if the signal quality in a path is below acceptable values, a path cannot be used by incoming requests for lightpath establishment. Therefore, the signal quality needs to be checked by the routing and wavelength...
Because of the rapid growth of both traffic and links capacity, the time budget to perform IP address lookup on a packet continues to decrease and lookup tables of routers unceasingly grow. Therefore, new lookup algorithms and new hardware platform are required to perform fast IP lookup. This paper presents a new scheme on top of the NetFPGA board which takes advantage of parallel queries made on...
Multi-domain traffic engineering is a major focus area for carriers and crankback signaling offers a very promising alternative. However, even though various crankback studies have been done, there remains significant latitude for improved multi-domain designs. To address these challenges, this work develops a novel solution for intra/inter-domain signaling crankback in IP/MPLS networks. Namely, dynamic...
The fine two-phase routing (F-TPR) scheme, an IP finely-distributed load-balanced routing scheme based on two-phase routing over shortest paths, was previously presented to improve routing performances. F-TPR distributes traffic from a source node to intermediate nodes simply by using IP tunnels. F-TPR provides comparable routing performance to the sophisticated traffic engineering (TE) scheme of...
Recent research results have shown that channel width is an important control knob that can be easily adapted through software and can be used for achieving higher system throughput and better energy efficiency. In this paper we address the problem of joint routing and transmission scheduling in a multichannel wireless mesh network with variable-width channel allocation. While narrower bands split...
MIPv6 is one of the dominating protocols that enable a mobile node to maintain its connectivity to the Internet when moving from one access router to another. However, it suffers from long handoff latency and routing inefficiency. In this paper, we present a novel distributed mobility management scheme, ADA (Asymmetric Double-agents Architecture), which introduces two mobility agents to serve one...
End-to-end fairness in a sensor network ensures that data from each sensor has an equal (or weighted) chance to reach the sink. It eliminates the problem that data flows from sensors at some locations (close to the sink) obtain most network bandwidth, while flows from sensors at other locations (far away from the sink) are starved. Existing fairness solutions assume single-path routing, which reduces...
Applications such as Voice over IP and video delivery require continuous network service, requiring fast failure recovery mechanisms. Proactive Fast failure recovery mechanisms have been recently proposed to improve network performance during the failure transients. The proposed mechanisms need extra infrastructural support in the form of routing table entries, extra addresses etc. In this paper,...
Fairness and system throughput, influenced by wireless interference, are major objectives of resource allocation in wireless networks. Whereas traditionally max-min fairness protocols have been developed for wired networks (where interference is not a factor for network performance), in this paper we investigate the problem of flow routing and fair bandwidth allocation under the constraints of the...
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