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Performance analysis of preemptive handoff scheme for integrated wireless mobile networks

Performance analysis of preemptive handoff scheme for integr...

引用

GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)

作者： Jingao Wang Qing-An Zeng D.P. Agrawal Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

We propose and analyze a preemptive handoff scheme for an integrated real-time and non real-time service wireless mobile network. The total channels of each cell are divided into three parts, one is for real-time service calls only, the second is for non real-time service calls only, and the last one is for overflowed handoff requests that can not be served in the first two parts. Out of third part, a few channels are reserved exclusively for the real-time handoffs service. To give the real-time service handoff requests higher priority over non-real-time service handoff requests, the real-time service handoff request is allowed to preempt the non-real-time service call when it finds no channel available on its arrival. The interrupted non-real-time service call returns back to the non-real-time service handoff request queue. The system is modeled by a multi-dimensional Markov chain and a numerical analysis is presented to estimate blocking probabilities of originating calls, forced termination probability of real-time service handoff requests calls, and average transmission delay of non-real-time service calls. This scheme is also simulated using extensive runs and both results are observed to agree fairly well. It is seen that the forced termination probability of real-time service calls is significantly reduced with our scheme while the probability of packet loss of non-real-time transmission is made to be negligibly small, as a non- real-time service handoff request can be transferred from the queue of current base station to another one.

关键词： Performance analysis Telecommunication traffic Delay estimation Traffic control Mobile computing computer science Numerical analysis Delay effects Propagation losses Base stations

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parallel algorithms for simultaneous scheduling, binding and floorplanning in high-level synthesis

Parallel algorithms for simultaneous scheduling, binding and...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Prabhakaran P. Banerjee Center for Reliable and High-Performance Computing Coordinated Science Laboratory University of Illinois Urbana-Champaign IL USA Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

With small device features in submicron technologies, interconnection delays play a dominant part in cycle time. Hence, it is important to consider the impact of physical design during high level synthesis. In comparison to a traditional approach which separates high-level synthesis from physical design, an algorithm which is able to make these stages interact very closely, would result in solutions with lower latency and area. However, such an approach could result in increased runtimes. parallel processing is an attractive way of reducing the runtimes. In this paper, two parallel algorithms for simultaneous scheduling, binding and floorplanning algorithm are presented. A detailed hardware model is considered, taking into account multiplexor and register areas and delays. Experimental results are reported on an IBM SP-2 multicomputer, with close to linear speedups for a set of benchmark circuits.

关键词： parallel algorithms High level synthesis Runtime Integrated circuit interconnections Delay effects Algorithm design and analysis parallel processing Scheduling algorithm Hardware Registers

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A reliable active scanning scheme for the IEEE 802.11 MAC layer handoff

A reliable active scanning scheme for the IEEE 802.11 MAC la...

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IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： Wei Li Qing-An Zeng D.P. Agrawal Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In the IEEE 802.11 wireless local area networks (WLANs) with fixed access points (APs), handoff occurs when a mobile station (MS) with a communication in progress changes its associated AP from one to another. It is important to minimize the handoff latency because the active communications of a MS are interrupted before the handoff completes. Such a design needs to take into consideration the high error rate of WLANs. The IEEE 802.11 medium access control (MAC) protocol recommends an active scanning mode for the handoff process. The probe delay of the active scanning may increase greatly if the probe request is lost. However, the successful transmission of the probe request is very unpredictable due to the high collision probability and the lack of any acknowledgement. In this paper, we propose a highly reliable active scanning scheme which can be implemented with the current IEEE 802.11 channel scanning procedure. It is indicated to efficiently increase the reliability of channel scanning, especially in a noisy environment, by performing the probe request loss detection and retransmission. Furthermore, the proposed scheme reduces the overall handoff latency by providing a higher priority for management frames over data frames.

关键词： Probes Delay Mobile communication Wireless LAN Media Access Protocol Mobile computing computer networks distributed computing Working environment noise Quality of service

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A handoff scheme with probability-based channel borrowing in integrated wireless mobile networks

A handoff scheme with probability-based channel borrowing in...

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Wireless Telecommunications Symposium, WTS

作者： Wei Li Hang Chen Agrawal Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

We propose and analyze a handoff scheme with channel borrowing in integrated wireless mobile networks. Channels in each cell are divided into two parts and pre-allocated to real-time and non-real-time services. Each type of service is allowed to borrow channels from the other under certain conditions. A non-real-time service call can borrow an unused channel assigned to real-time service but it can be preempted by a real-time service call. A real-time service call borrows a channel from non-real-time service with a certain probability which depends on the number of available idle non-real-time service channels. We model the system by a six-dimensional Markov chain and compute the system performance in terms of blocking probability of originating calls, forced termination probability of real-time service calls, and average transmission delay of non-real-time service calls. The proposed scheme maximizes the resource utilization and keeps a certain quality of service (QoS) for each service at the time of congestion.

关键词： Intelligent networks Quality of service Mobile computing Delay computer networks distributed computing Resource management Microcell networks Wireless sensor networks computer science

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A novel application development environment for large-scale scientific computations 00

A novel application development environment for large-scale ...

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Proceedings of the 14th international conference on Supercomputing

作者： X. Shen W. Liao A. Choudhary G. Memik M. Kandemir S. More G. Thiruvathukal A. Singh Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL Department of Computer Science and Engineering The Pennsylvania State University University Park PA School of Computing Telecommunications and Information Sciences JHPC Laboratory Depaul University

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

ISBN: (纸本)9781581132700

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

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Analysis and optimization of energy efficiency in 802.11 distributed coordination function

Analysis and optimization of energy efficiency in 802.11 dis...

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IEEE International Conference on Performance, computing and Communications (IPCCC)

作者： Xiaodong Wang D.P. Agrawal Center of Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

Energy efficiency has been a bottleneck in the wireless local area network (LAN) based communication of portable wireless devices. This paper introduces an analytical model to investigate the energy efficiency of 802.11 distributed coordinated function (DCF) under both ideal channel and error prone environment. The two major factors contributing to the extra energy consumption in 802.11 DCF: contention and transmission errors, are analyzed thoroughly. Based on the analysis, a scheme of choosing optimal minimum contention window size to optimize the energy consumption under both ideal and error prone environment is proposed. Our extensive simulation results are observed to match very well with the analytical results, which indicate that the analytical model is accurate.

关键词： Energy efficiency Energy consumption Analytical models Protocols Wireless LAN Error analysis Throughput Mobile computing computer networks distributed computing

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Analysis of Negative Capacitance MOSFETs Characteristic with Spacer

Analysis of Negative Capacitance MOSFETs Characteristic with...

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2020 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2020

作者： Lee, Yu-Chun Kola, Sekhar Reddy Chen, Chieh-Yang Chuang, Min-Hui Li, Yiming Parallel and Scientific Computing Laboratory Institute of Biomedical Engineering Institute of Communications Engineering Eecs International Graduate Program Department of Electrical and Computer Engineering Center for MmWave Smart Radar System and Technologies National Chiao Tung University 1001 Ta-Hsueh Rd Hsinchu300 Taiwan

ISBN: (纸本)9781728142326

In this work, our study comprises of design and investigation on negative capacitance (NC), metal-oxide-semiconductor (MOS) field effects transistors (MOSFETs) with spacer and source/drain (S/D) overlap engineering. The scope of the work is to boost the performance and high-energy efficiency of the studied NC-MOSFETs by using the ferro electric material (FE). The NC-MOSFETs with the spacer technology can achieve the admirable Ion/Ioff ratio and subthreshold swing (SS), compared with planar MOSFETs. It makes device scaling possible by eliminating the short channel effect (SCE). We further estimated the effect of FE thickness and spacer, which are another critical parameter of obtaining better electrical characteristics and reducing SS. © 2020 IEEE.

关键词： Capacitance

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A reverse channel call admission control scheme based on total received power for CDMA systems supporting integrated voice/data services

A reverse channel call admission control scheme based on tot...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Wei Li D.P. Agrawal OBR Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In code-division multiple-access (CDMA) systems, the number of users that each cell can support is limited by the total received power or interference received at each base station and can vary with time. The total received power can be used as an indicator of traffic load in call admission control. In this paper, we develop an algorithm to estimate the updated total received power due to a new call based on the current measure of the received power. Using this algorithm, we propose a call admission control (CAC) scheme with the purpose of maximizing the resource utilization and guaranteeing a minimum amount of resources for each type of traffic when congestion occurs. We model the system by a multi-dimensional Markov chain to evaluate the system performance.

关键词： Call admission control Multiaccess communication Multiple access interference Base stations Telecommunication traffic Current measurement Power measurement Resource management Traffic control Power system modeling

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Extracting Critical Attributes in Wireless Sensor Networks Using Modified Regression Polynomial

Extracting Critical Attributes in Wireless Sensor Networks U...

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IEEE International Conference on Networking, Sensing and Control

作者： T. Banerjee D.P. Agrawal D. French OBR Center for Distributed and Mobile Computing The Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In this paper, the spatio-temporal nature of sensor data is exploited to approximate current values of the sensors based on the observation of the same sensor in the previous period of time and the neighboring sensors' data. By applying linear regression, a polynomial can fit variation in the data over a given region for a specific period of time. Assuming attributes to have a gradual change both over time and space, readings of the neighboring sensors are highly correlated and the readings of sensors at any current period of time do not change drastically from the previous period. Based on this assumption, instead of performing the regression algorithm every time the sensed attributes change, an iterative scheme is employed by which the current values of sensors are approximated based on the previous readings. The percentage error in this approximation process is found to be less than 6%, while saving considerable amount of computational overhead. Analysis of the regression polynomial also accurately gives the location of critical points in the sensed region where minimum and maximum attribute values occur and could be very useful for sensor network applications

关键词： Intelligent networks Wireless sensor networks Polynomials Sensor phenomena and characterization Regression tree analysis Mobile computing distributed computing computer science Data mining Linear regression

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Hops-based Sleep Scheduling Algorithm for Enhancing Lifetime of Wireless Sensor Networks

Hops-based Sleep Scheduling Algorithm for Enhancing Lifetime...

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IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems (MASS)

作者： Yun Wang Demin Wang Weihuang Fu Dharma P. Agrawal OBR Center of Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In this paper, we study the node sleep scheduling scheme in the commonly used static disk model for sensor networks, where homogenous sensors are uniformly distributed in a circular area with a stationary sink located at the center. Then, we introduce and analyze a hops-based sleeping scheduling algorithm (HSS) for enhancing the lifetime and energy efficiency of the sensor networks. The HSS divides the circular sensor network into several levels according to the average hop distance based on certain network parameters. By assigning hops-based sleeping probabilities to each sensor, and the network lifetime as well as energy efficiency can be greatly improved. Simulations are performed to compare our proposed HSS scheme with the traditional randomized sleeping scheduling (RSS) scheme, where all the nodes have the uniform sleeping probability. The results demonstrate that our HSS scheme can enhance network lifetime greatly, provide desired QoS requirement effectively, and drastically outperform the RSS scheme

关键词： Sleep Scheduling algorithm Wireless sensor networks Sensor phenomena and characterization Spread spectrum communication Energy efficiency Energy consumption Processor scheduling computer science Telephony

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