This paper proposes a power control scheme for the efficient radio bearer selection in the Multimedia, Broadcast/Multicast Service (MBMS) framework of Universal Mobile Telecommunications System (UMTS). The choice of t...
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ISBN:
(纸本)9781424409921
This paper proposes a power control scheme for the efficient radio bearer selection in the Multimedia, Broadcast/Multicast Service (MBMS) framework of Universal Mobile Telecommunications System (UMTS). The choice of the most efficient transport channel in terms of power consumption is a key point for the MBMS since a wrong transport channel selection for the transmission of the MBMS data could result to a significant decrease in the total capacity of the system. Different UMTS transport channels are examined and an algorithm that defines the switching point between dedicated and common radio bearers is proposed The proposed MBMS power control scheme selects the transport channel that reduces the Node B's transmission power in every cell of the network with multicast users.
We address the issue of measuring storage, or query load distribution fairness in peer-to-peer data management systems. Existing metrics may look promising from the point of view of specific peers, while in reality be...
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The problem of trajectory similarity in moving object databases is a relatively new topic in the spatial and spatiotemporal database literature. Existing work focuses on the spatial notion of similarity ignoring the t...
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The existence of good probabilistic models for the job arrival process and the delay components introduced at the different stages of job processing in a Grid environment is important for the improved understanding of...
With the rapid progress of mobile devices and positioning technologies, Trajectory Databases (TD) have been in the core of database research during the last decade. Analysis and knowledge discovery in TD is an emergin...
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ISBN:
(纸本)9781424408313
With the rapid progress of mobile devices and positioning technologies, Trajectory Databases (TD) have been in the core of database research during the last decade. Analysis and knowledge discovery in TD is an emerging field which has recently gained great interest. Extracting knowledge from TD using certain types of mining techniques, such as clustering and classification, impose that there is a mean to quantify the distance between two trajectories. Having as a main objective the support of effective similarity query processing, existing approaches utilize generic distance metrics that ignore the peculiarities of the trajectories as complex spatiotemporal data types. In this paper, we define a novel set of trajectory distance operators based on primitive (space and time) as well as derived parameters of trajectories (speed and direction). Aiming at providing a powerful toolkit for analysts who require producing distance matrices with different semantics as input to mining tasks, we develop algorithms for each of the proposed operators. The efficiency of our approach is evaluated through an experimental study on classification and clustering tasks using synthetic and real trajectory datasets.
This paper proposes a framework for patient's vital sign representations. This framework offers the flexibility to extend or to augment represented vital signs, e.g. with trend signs or professional's annotati...
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One promising family of search strategies to alleviate runtime and storage requirements of ILP systems is that of stochastic local search methods, which have been successfully applied to hard propositional tasks such ...
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In this paper, a discrete stochastic dynamic programming model for the High Speed Downlink Packet Access (HSDPA) downlink scheduler with multi-state Markov channel model is presented. The model then solved numerically...
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ISBN:
(纸本)9781595938053
In this paper, a discrete stochastic dynamic programming model for the High Speed Downlink Packet Access (HSDPA) downlink scheduler with multi-state Markov channel model is presented. The model then solved numerically (using Markov Decision Process and Dynamic Programming) to find the optimal policy for the case of two users sharing the same cell using a 3-state channel. The optimal policy is the one that maximizes the system throughput while main-taining a level of fairness between users. Simulation is used to study the performance of the resulted optimal policy and compared with Round Robin (RR) scheduler. The effects of the allowable number of channel states and the fairness factor on the optimal policy performance were also studied. Copyright 2007 ACM.
In this paper, we present work that we have carried out in extending the ns-2 simulator in order to study and validate Quality of Service issues and related architectures. In the case of the DiffServ framework, simula...
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ISBN:
(纸本)1565553128
In this paper, we present work that we have carried out in extending the ns-2 simulator in order to study and validate Quality of Service issues and related architectures. In the case of the DiffServ framework, simulation is valuable since an analytical approach of mechanisms and services is infeasible due to the aggregation and multiplexing of flows. This paper covers work in extending ns-2 functionality towards the direction of realistic traffic generation and a series of mechanisms defined by the DiffServ architecture. We have also extended ns-2 with the functionality of Bandwidth Brokers, which are entities for managing the resources and negotiating end to end resource reservations between domains. The Bandwidth Broker ns-2 implementation is useful for studying the related architectures and admission control procedures.
In this paper we introduce the NTCIR6 Opinion Analysis Pilot Task, information about the Chinese, Japanese, and English data, plans for future opinion analysis tasks at NTCIR, and a brief overview of the evaluation re...
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