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Cognitive radio is the next-generation wireless communication network that improves the efficiency of the radio spectrum through exploitation of underutilized licensed spectrum (or white spaces). This paper applies a reinforcement learning-based Trust and Reputation Management (TRM) scheme to cluster-based routing and shows network performance enhancement, including throughput and rewards. Generally...
Mobile ad hoc networks proved their efficiency in the deployment for different fields, but highly vulnerable to security attacks. It seems to be more challenging of in wireless networks. Existing research carried out provides authentication, confidentiality, availability, secure routing and intrusion detection in ad hoc networks. Ad hoc network characteristics should be taken into consideration to...
In this paper we developed a sub-optimal algorithm for joint routing and power allocation for an amplify-and-forward multi-hop relay network. The objective function for the optimization is the received signal-to-noise ratio (SNR) at the destination. Higher SNR would cause for lower bit error rate consequently. The joint problem of power allocation and relay selection is formulated with respect to...
We consider the network with two kinds of traffic: inelastic and elastic traffic. The inelastic traffic requires fixed throughput, high priority while the elastic traffic has controllable rate and low priority. Giving the fixed rate of inelastic traffic, how to inject the elastic traffic into the network to achieve the maximum utility of elastic traffic is solved in this paper. The Lagrangian Duality...
Guarding against channel errors in wireless networks has been a challenging research problem, specially when transmitting time-constrained contents, like streaming video or image. Source diversity in the form of Multiple Description Coding (MDC) has been studied for guarding against wireless channel errors. In MDC, an image is broken into several equally important descriptions which can be sent over...
We propose an immediate re-routing (IRR) extension to RSVP-TE signaling and implement it on our IDBR test-bed. By allowing wavelength conversion during the re-routing process, the proposed scheme can significantly reduce signaling induced blocking.
Unreliable connectivity and rapidly changing link qualities make it challenging to establish stable addressing in wireless networks. This is especially difficult in communication scenarios where nodes determine their own addresses based on the underlying connectivity in the network. In this paper, we present Probabilistic ADdressing (PAD), a virtual coordinate based addressing mechanism that efficiently...
When shortest path routing is employed in large scale multi-hop wireless networks, nodes located near the center of the network have to perform disproportionate amount of relaying for others. To solve the problem, various divergent routing schemes are used which route the data on center-avoiding divergent routing paths. Though they achieve better load balancing, overall relaying is increased significantly...
Cognitive radio (CR) emerges as a key technology to enhance spectrum efficiency and thus creates opportunistic transmissions over links. Supporting the routing function on top of numerous opportunistic links is a must to route packets in a general cognitive radio network (CRN) consisting of multi-radio systems. However, there lacks complete understanding of these highly dynamic available links and...
Employing channel state information at the network layer, an effective routing metric is obtained that minimizes the end-to-end outage probability in amplify-and-forward multihop wireless networks. A disadvantage of the routing metric obtained is that it cannot be optimized in distributed manner, i.e., it does not converge onto optimal routes. The disadvantage cannot be remedied by exhaustive search...
In recent years, along with the increasing popularity of multi-hop wireless networks, there has been a growing demand in the coupling of these networks to external ones such as the Internet. As traffic destined for external networks increases, special attention is required not only in gateway selection, but also in optimized routing and scheduling in order to maximize the network performance. In this...
In multihop wireless networks, end-to-end throughput is often hard to predict and is even harder to optimize due to the effect of interference. To date there is no precise result other than asymptotic bounds for this question: if there is no routing information given, what is the maximum throughput of a network using uncoordinated transmission such as IEEE 802.11 MAC? This paper attempts to address...
This paper is focused on the analysis of energy-aware multi hop routing metrics for wireless environments which integrate heterogeneous devices that are carried or owned by Internet end-users. The paper gives our own (initial) perspective on how network energy-savings may be improved by considering not only a single (sender) node perspective, but also the perspective of its potential successors when...
This paper studies the problem of joint routing and transmission scheduling for reliable real-time communication over lossy networks. We impose a strict latency bound on the packet delivery from source to destination and develop transmission scheduling policies that maximize the probability that the packet is delivered within the specified deadline. A solution to this problem allows to characterize...
We propose a new cross-layer approach to mitigate interference in multihop networks. Precisely, we cancel all adjacent node interference in a multihop path by MIMO two-way relay scheme and jointly optimize the routing and power allocation to mitigate the interference from far nodes. We model and efficiently solve this optimization problem using a geometric programming framework. Our simulation results...
Opportunistic routing in wireless networks has strong requirement with nodes' cooperation. But in most realistic networks, nodes perform in their own interests and refuse to forward packets for others when they belong to different organizations. The aim of this paper is to provide a fair incentive mechanism to encourage cooperation and achieve the energy efficient. We propose an auction incentive...
In wireless multihop networks, route selection plays an important role in network performance in terms of throughput capacity, as well as, energy efficiency. In general, the route selection strategy should distribute the traffic throughout the network, in order to avoid congestion. This strategy also has the side-effect of distributing the energy consumption among all nodes, so that the energy starvation...
In multi-hop wireless networks, if we know the packet reception rates of all links in the network, we can find the path with the minimum energy consumption. However, to obtain the packet reception rates with high accuracy, we need a number of exchanges of probe packets. Also, the energy consumption along a path depends on a routing method. In this paper, we consider three routing methods and evaluate...
Delay tolerant networks (DTNs) are a special type of wireless mobile networks which may lack continuous network connectivity. Multicast is an important routing function that supports the distribution of data to a group of users, a service needed for many potential DTNs applications. While multicasting in the Internet and mobile ad hoc networks has been studied extensively, efficient multicasting in...
A spectrum leasing mechanism is proposed for the coexistence between a primary and a secondary network that is based on cooperation and opportunistic routing. The primary network consists of a source and a destination communicating via a number of primary relay nodes. In each transmission slot, the next hop is selected in an on-line fashion based on the decoding outcomes in the previous transmissions...
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