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Dynamic Index coding as a generalization of the traditional index coding problem, deals with transmission of some dynamic data flows in the presence of side information. For a dynamic index coding system, the set of average flow rates for which the system can be stable is named Code-Constraint Capacity region. In this paper, we identify the code-constraint capacity region for a dynamic index coding...
Traffic flowing through a software defined network is vulnerable to disruptions caused by malicious switches. The malicious behaviors are diverse such as dropping traffic, adding traffic or modifying it. A switch could be malicious or otherwise dysfunctional or misconfigured. A lot of work in SDN has addressed the problem by securing the control plane and having it validate network wide properties...
Delay Tolerant Networks(DTNs) is network architecture designed to enable communication even in an unstable network connectivity between end. Nodes can't be pre-selected for a route because they can't know the information of the entire network. Therefore, the relay node should be selected effective to improve network performance. So the movement prediction scheme of the node is needed for this. In...
This paper considers the problem of reducing the broadcast delay of wireless networks using instantly decodable network coding (IDNC) based device-to-device (D2D) communications. In D2D-enabled networks, devices help hasten the recovery of the lost packets of devices in their transmission range by sending network coded packets. To solve the problem, the different events occurring at each device are...
The capacity limits of the Random Access Channel (RACH) of Long Term Evolution (LTE) for highly dense Machine-to-Machine communications are studied in this paper. We consider the case study when a high number of devices attempt to transmit information to the same base station in a very short period of time. Simulations have been performed considering several parameter configurations related to the...
We have proposed a spatial group based random access (SGRA) scheme which is a novel RA scheme to effectively increase the number of available preambles for future cellular M2M communications. In the SGRA scheme, a machine node in the cell should determine its own spatial group (SG) by estimating the distance between the eNodeB and itself through any distance estimation methods. At the moment, the...
It has been observed that opportunistic networks exhibit a highly unbalanced traffic load distribution, mainly because of the heterogeneity in mobility and the greedy routing decisions, leading to packet drops due to storage constraints. The existing strategies rely either on fairness techniques or on diverting traffic to alternative routes in order to control congestion. The result is a dilemma between...
The problem of quickest detection of an anomalous process among M processes is considered. At each time, a subset of the processes can be observed, and the observations follow two different distributions, depending on whether the process is normal or abnormal. The objective is a sequential search strategy that minimizes the expected detection time subject to an error probability constraint. This problem...
Vehicular delay-tolerant networks (VDTNs) are a promising technology for vehicular communications, creating application scenarios that enable non-real time services with diverse performance requirements. Because of scarce network resources (e.g. bandwidth and storage capacity) and node's short contact durations, the underlying VDTN network infrastructure must be capable of prioritizing traffic. This...
We investigate the problem of finding minimum-distortion policies for streaming delay-sensitive but distortion-tolerant data. We consider cross-layer approaches which exploit the coupling between presentation and transport layers. We make the natural assumption that the distortion function is convex and decreasing. We focus on a single source-destination pair and analytically find the optimum transmission...
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