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The expected higher complexity of upcoming 5G wireless backhauls suggests the need to evolve towards a softwaredefined networking (SDN) paradigm to increase the degree of programmability of these networks. Within the context of softwaredefined wireless backhaul, one important issue is the provision of an even resource consumption of both network and IT resources. Backpressure policies have shown their...
Since traffic load in mobile networks typically changes significantly over time, time-varying routing, where routing changes in certain time intervals, seems an obvious solution. Yet multiple researchers have claimed independently in the past, that time-varying routing does not lead to worthwhile benefits given its overhead. In this paper, we study this issue in a systematic way. We argue that previous...
The SDN architecture decouples the control plane and data plane, and multiple controllers are adopted to solve the scalability and reliability problem in SDN. However, most of the researches are focused on the control architecture and ignore the controller placement problem. Moreover, the mapping between the switches and controllers are static in current proposals, which will lead to the load unbalance...
SDN is a novel network architecture that separates the control plane from the data plane. It usually utilizes a centralized controller to manage all the switches in the network. With the expanding of network scale, both the complexity of computing routes and the amount of messages exchanged between controller and switches are increasing sharply. The limited performance of a single controller will...
In this paper we propose a spectrum aggregation-based cooperative routing protocol, termed as SACRP, for CRAHNs. The primary objective of SACRP is to improve throughput and reduce end-to-end delay for CRAHNs. In this regard, we design the Media access control (MAC) and Physical (PHY) layer, and propose different spectrum aggregation algorithms for cognitive radio (CR) users. We propose two different...
Distributed cooperative spectrum sensing is an effective and feasible approach to detect primary users in Cognitive Radio Mobile Ad Hoc NETworks (CR-MANETs). However, due to the dynamic and interdependent characteristics of this approach, malicious attackers can interrupt the normal spectrum sensing more easily in open environments by spectrum sensing data falsification attacks. Meanwhile, attackers...
In this paper, we define a collision area in a heterogeneous cellular network for the purpose of interference management between Device-to-Device (D2D) and conventional cellular (CC) communications. Currently, most D2D routing algorithms assume synchronized accurate location knowledge among users and the base stations. In reality, this level of location accuracy is difficult and power consuming in...
Massive MIMO is envisioned as one of the key enabling technologies for 5G wireless and beyond. While utilizing the spatial dimension to reduce interference and increase capacity in multi-user scenarios, massive MIMO base stations present several unique implementation challenges due to their large physical size and the high datarate generated by all the elements. To be cost-effective and energy efficient,...
In the Wavelength Division Multiplexing (WDM) based optical circuit switching network, it takes longer time to set up the intermediate optical cross-connecting devices on the route. Thus, pre-computed routing approaches are desirable to instantly set up the connection. Most of their research works are based on the K Shortest Path (KSP) algorithm or it's variants considering route disjointness, because...
With the development of mobile internet, wireless communications via mobile devices in the form of Delay Tolerant Networks (DTNs), becomes a hot research topic. One critical issue in the DTNs with social characteristics is that there could exist selfish nodes which are unwilling to forward messages from strangers and malicious nodes which intentionally impair normal communication. Although there are...
Massive data centers form the core infrastructure support for the ever increasing cloud based services. Hence, the performance of data centers will have important influence on the scalability of these services. In particular, the data center network must be agile, available and scalable in order to respond to ever changing service requirements and application demands. Thus, the research community...
We consider wireless sensor networks (WSN) powered by energy harvested from the environment, which is assumed to be sporadic and random in nature. Wireless nodes in such networks experience random active and sleep periods depending on their energy availability, leading to intermittent connectivity in the network. This paper addresses the problem of minimizing the multi-hop transmission delay in such...
Vehicular networks are inherently unstable networks with high mobility and intermittent connectivity. These networks can greatly benefit from Delay Tolerant Networking (DTN) solutions for opportunistic connectivity in the transmission of delay-tolerant data. In this paper, we evaluate the performance of different DTN routing protocols in real world vehicular networks with different degrees of connectivity...
These days, the demand for investigating underwater area by using underwater sensor network is increasing. Compared with terrestrial environment, underwater communication has specific characteristics of low bandwidth and high packet loss rate. Hence, robust data transfer needs to be realized with lower network load by limiting the number of exchanged packets, reducing end-to-end data packet transfer...
Without doubt, the Internet of Things (IoT) is changing the way people and technology interact. Fuelled by recent advances in networking, communications, computation, software, and hardware technologies, IoT has stepped out of its infancy and is considered as the next breakthrough technology in transforming the Internet into a fully integrated Future Internet. However, realising a network of physical...
RPL is specifically designed for Low power and Lossy Networks (LLNs). With the expansion of LLNs applications, security of RPL becomes one of the major concerns. This paper mainly addresses the security aspect of RPL. We first analyze the vulnerability of RPL self-organising properties, and identify a new RPL internal intrusion, named routing choice (RC) intrusion. We specially analyze the harm of...
This paper addresses the problem of joint routing and backhaul link scheduling in a dense small cell network using 60GHz multi-hop backhaul, coordinated by a local Cloud-RAN central unit. Our objective is to optimally select the backhaul links and paths to be activated in time domain to enhance the cell throughput and to minimize the total delay, considering the backhaul channel conditions and the...
IEEE 802.3az, the recent standard for Energy Efficient Ethernet, is one of the main contributions of the ICT industry to the global quest for energy efficiency. Energy consumption reduction is accomplished by essentially replacing the continuous IDLE of legacy IEEE 802.3 cards with a Low Power Idle. While this is an important step in the right direction, studies have shown that the energy saving with...
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