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The literature on queueing systems with finite buffers addresses mostly asymptotic performance metrics on an aggregate flow, and/or generally relies on a convenient, but provably inaccurate, approximation of the loss probability by the overflow probability in an infinite size buffer. This paper addresses non-asymptotic per-flow metrics in a multi-flow queueing system with finite buffer and FIFO scheduling...
We present stochastic vehicle routing policies for detection of any number of anomalies in a set of regions of interest. The autonomous vehicle collects information from a set of regions and sends it to a fusion center. The vehicle follows a randomized region selection policy at each iteration. Using the collected information, the fusion center runs an ensemble of cumulative sum (CUSUM) algorithms...
Bus Net is a kind of wireless network which is consist of buses and bus stations. It has the following features: 1) no end-to-end connection between source and destination, 2) intermittent connectivity, 3) high end-to-end delays. However, unlike the other DTNs, the node's mobility in Bus Net is semi-deterministic, which means the node's line is determined but the arriving time is undetermined. With...
Recently developments in the field of telecommuni-cations and network technology has been formed new paradigm shift in defense weapon system. The military also developing the Tactical Information Communication Network (TICN) system to meet the changing aspects of these wars. To equip its function from the battlefield, TICN system have to be received real-time information from the battlefield troop,...
Owing to the high data rate of IEEE 802.11n, high-definition video transmission becomes one of its major applications. However, it's still difficult for contention-based MAC layer to provide enough QoS guarantee for such latency-sensitive applications. This paper has analyzed the performance on delay, throughput and packet loss rate in error-prone channels based on the frame aggregation mechanism...
This paper proposed a novel algorithm based on Kolmogorov-Smirnoff(K-S) algorithm to detect the selfish behavior of nodes. Compared with the detection of transmitted number, the detection performance including speed and precision has been significantly improved. The radio conditions are not needed and capture effect would not impact the performance of the algorithm. Simulation experiments show that...
Machine type communications have emerged with new types of applications and revenue sources both for network operators and cellular/network equipment companies. This new kind of service may increase significantly the number of devices accessing the network in the next few years, and could have some impacts over the current services, namely normal voice and data services. One important concern is related...
Failure Mode and Effect Analysis (FMEA) has already been used as a qualitative measure for identifying failure modes and causes, in order to mitigate the effects of failure in different sectors of power systems. This paper presents a quantitative approach called Risk-Based-FMEA, based on the failure probabilities and incurred failure costs instead of rating scales. As a case study, this approach has...
IMS was introduced into R5 core network by 3GPP, and SIP was chosen as the call/session control portocol. However??CSIP message's size is becoming a performance bottleneck. Based on the SigComp, this paper gives a new compression algorithm. It includes LZSS and Huffman with pretreatment. And this paper gives a SigComp session delay model. Simulation results prove that the new algorithm can effectively...
In deterministic timing optimization, timing slack is used to verify whether a timing violation occurs or not without timing updates on the entire circuit. However, in statistical timing optimization, there is currently no criterion to verify whether a timing violation occurs. This paper proposes a novel metric of timing yield slack to verify whether the timing yield violation occurs without updating...
Packet switched networks achieve significant resource savings due to statistical multiplexing. In this work we explore statistical multiplexing gains in single and multi-hop networks. To this end, we analyze performance metrics such as delay bounds for a through flow comparing different results from the stochastic network calculus. We distinguish different multiplexing gains that stem from independence...
In this work we present a theoretical formulation for the performance of a constant false alarm ratio (CFAR) detector for GNSS signals based on an FFT fully parallel acquisition scheme. The performance is measured in terms of receiver operating characteristic (ROC) and analytical expressions for the false alarm probability and the detection probability are derived. A detailed analysis is carried out...
Motivated by applications in industrial communication networks, in this paper we consider the trade-off between relationship anonymity and communication overhead in anonymity networks. We consider two anonymity networks; Crowds that provides unbounded communication delay and Minstrels, proposed in this paper, that provides bounded communication delay. While Crowds hides the sender's identity only,...
Low Earth Orbit (LEO) satellite networks are expected to provide a variety of multimedia applications. In order to satisfy different QoS requirements and optimize utilization of network resources, a novel traffic classification routing algorithm (TCR) is proposed. The key technique of TCR is investigating the traffic classification link-cost metrics (TCM) for different traffic classes, which selects...
Providing quality of service (QoS) to the passengers at an airport is extremely challenging due to the dynamic nature of the environment in which they operate coupled with their own behaviour. With the regular arrivals and departures of flights, passenger flow tends to continuously change making it more difficult to maintain the required QoS. Moreover, deploying an ad hoc system in such a scenario...
In sub-micron technology, a small inaccuracy in computing the probability of occurrence of a soft error results into an unacceptable chip failure rate. A method to estimate the probability of SET propagation to the output gate at any time instant within the latching window is proposed. Its accuracy is evaluated using Monte Carlo simulations.
Opportunistic Dynamic Spectrum Access (DSA) systems are emerging as a key to enable the Department of Defense (DoD) to meet its technology requirements for access to the electromagnetic spectrum. One of the main goals of DSA is to protect incumbent spectrum users from interference that could be caused by DSA emitters. One of the ways to accomplish this is through spectrum sensing as means to enable...
In this paper we describe RED-Random Early Detection which is an active queue management algorithm for congestion control. The basic idea of RED is that one should not wait till the buffer is full in order to detect drop packets but start detecting congestion before the buffer overflows. In this paper we present the performance behavior of RED which it posses under different congestion control schemes...
In this paper, we present an adaptive voltage scaling (AVS) scheme to tune the supply voltage of digital circuits according to variations. Compared to worst-case designs, which produce fixed and excessively large safety margins, a considerable amount of energy can be saved by this approach. The AVS technique is based on in-situ delay monitoring, i.e. observing the timing in critical paths. For this...
Most previous work on spectrum sharing in the cognitive radio (CR) networks did not take into account the influence of node mobility on link available time as well as the spectrum heterogeneity. In this paper, a spectrum sharing algorithm based on spectrum heterogeneity is presented for centralized CR network, meanwhile the individual CR users are free to be mobile. A prediction model of channel usage...
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