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In this paper we derive the distribution of the total contention delay in wireless sensor networks (WSNs) tasked with detection of an intruder in a specific sensing field. We use a stochastic geometry framework to model the WSN, in which the sensor nodes send their local decisions and data to the fusion center over a shared communication channel employing a contention based MAC protocol. We first...
Ultra-Dense Network (UDN) is a promising technology to cope with explosively increasing traffic demands. Delay is an important performance indicator in UDN. In this paper, we analyze the impacts of average sleeping time of BS and association radius on the mean delay in UDN. The explicit relationship between delay and the average sleeping time and association radius is presented. An M/G/1/N processor...
Analytical models of the Distributed Coordination Function (DCF) have numerous applications in the performance analysis of IEEE 802.11 networks. The model proposed in this paper distinguishes itself from existing approaches in that it allows throughput, delay, and frame loss ratio analysis under both saturation and non-saturation network conditions. It combines the Markov chain and the queuing theory...
In this paper, we first introduce the concept of cognitive machine-to-machine (M2M) communications. In cognitive M2M communications, devices generate packets and the packets are transferred to a concentrator. The concentrators are considered to be secondary users in the cognitive radio network opportunistically accessing a channel allocated to primary users. Based on a random access channel (RACH)...
Architectures for information-centric networks (ICNs), like CCN, propose simple on-path caching with LRU cache management for caching of data items in the network. We propose alternative strategies, based on off-path caching, which try to avoid redundant caching of data items to use cache space more efficiently. Based on a mathematical model for LRU and LFU cache management and a simulation, we analyze...
Current trends show an increasing number of Dedicated Channels having a Small number of Viewers (DCSV for short) in multi-channel live streaming systems. Usually, DCSV channels are either user generated or dedicated channels and they suffer adversely from poor channel performance, mainly, due to having a small number of participants. As a result, when a viewer explicitly requests for a block of streaming...
In-band spectrum sensing requires that the secondary users (SU) periodically suspend their communication in order to determine whether the primary user (PU) has started to utilize the channel or not. In contrast, in spectrum monitoring the SU can detect the emergence of the PU from its own receiver statistics such as receiver error count (REC). Previously it is shown that in AWGN channels, a hybrid...
The problem of quickly detecting a statistical change and identifying the change source is considered. In the problem studied, there are multiple sensors. A change can first occur at any one of these sensors and propagate to other sensors. One is required to detect the presence of such change with a minimal delay and furthermore identify the sensor that first observes the change. Three performance...
The growth of different types of applications in the Internet arises the need for supporting Quality of Service (QoS) for them. Differentiating services aims to differentiate among applications in order to provide their requirements based on the level of QoS they need and their characteristics. In this paper we introduce a dynamic QoS-Aware queuing algorithm to differentiate services in IP basednetworks,...
Previous Delay Tolerant Network (DTN) routing algorithms exploit either past encounter records (probabilistic routing) or social network properties (social network based routing) to derive a node's probability of delivering packets to their destinations. However, they only have a local view of the network, which limits the routing efficiency. Also, when two nodes meet, they have to exchange the delivery...
In Delay and Disruption Tolerant Networks (DTNs), the message delivery rate is impacted by the buffer management policy adopted by nodes once buffer overflows occur frequently. This paper proposes two new buffer management policies. The first one, called LPS (Less Probable Sprayed), uses the messages delivery probability and estimates the number of replicas already disseminated to decide which message...
A novel method is proposed to enhance SET propagation probability and it is shown how it can assist the hardening process. This paper provides a method to determine a set of patterns that must be applied at the inputs to determine propagation characteristics of the SET that are meaningful for hardening purposes. The impact of the proposed method is experimentally verified on the ISCAS and ITC benchmarks.
Delay Tolerant Mobile Sensor Networks (DTMSN) has the enormous potential to expand its applications in many previously impossible fields. Because of its intermittent link and limited network resources, this network needs an effective data forwarding algorithm to ensure valid data forwarding and highly delivery ratio. Recent approaches have drawbacks of computing nodes' delivery probability, because...
Research on routing in a network of intelligent, lightweight, micro and nano-technology sensors deployed in or around the body, namely Body Area Network (BAN), has gained great interest in the recent years. In this paper, we present an energy efficient, thermal and power aware routing algorithm for BANs named Energy Efficient Thermal and Power Aware routing (ETPA). ETPA considers a node's temperature,...
Resource allocation is a critically important issue for cognitive networks, because it needs to not only meet the quality-of-service (QoS) requirements for the secondary users (SU), but also protect the QoS of primary users (PU) from degradation. In this paper, we develop the optimal power allocation scheme for the cognitive network, which can satisfy the QoS requirements of SUs and PUs simultaneously...
In this paper, we evaluate the performance of a burst retransmission method for an optical burst switched network with intermediate-node-initiation (INI) signaling technique. The proposed method tries to reduce the burst contention probability at the intermediate core nodes. We develop an analytical model to get the burst contention probability and burst loss probability for an optical burst switched...
A thorough investigation of barrier breakdown in MgO based Magnetic Tunnel Junctions is presented. Our samples were tested under pulsed electrical stress. By studying the effect of delay between two pulses, we observe that an optimum endurance of MTJs is obtained for an intermediate value of delay between pulses which allows a partial discharge of the trapping sites between two pulses. The charge...
Distributing data items such as pictures and videos about traffic conditions at a location a driver wants to go through Vehicular Ad hoc Networks (VANETs) poses a great challenge due to network dynamics and high-speed mobility. In the last decade, random network coding (RNC) has been shown to support content distribution efficiently in such dynamic environments. Our goal is designing a method for...
The Internet architecture provides a mechanism for protecting individual flows from congestion, by introducing queue management and scheduling algorithms in Input-Queued switches having finite queue size to improve the QoS performance in terms of throughput and delay. Queue management algorithms manage the length of packet queues by dropping packets when necessary or appropriate, while Scheduling...
We consider a long-haul network in which sensors are remotely deployed and tasked to send state estimates of a dynamic target to the fusion center via satellite links. Due to severe loss and delay inherent in satellite channels, the number of estimates successfully arriving at the fusion center can be quite limited. A certain retransmission-based transport protocol can be applied so that lost messages...
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