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In heterogeneous cellular networks (HCNs), it is highly desirable to design a cell association strategy that can actively offload mobile users to less congested small cells. Such a cell association strategy needs to be considered in conjunction with resource allocation. In this paper we take an optimization approach to analyze joint cell association and resource allocation in a two tier HCN. We formulize...
Artificial Society had been seemed as a new way to study emergence management. The traditional modeling and simulation could not satisfy the large population in Artificial Society. A Two-tier Parallel Architecture simulation is proposed to solve the large scale problem. Based on the analysis of parallelism degrees in Artificial Society, both MPI and GPU computation are used to construct the novel...
The cloud computing paradigm attracts increasing amount of Modeling&Simulation (M&S) practitioners to perform their simulations in the cloud. Two issues, namely, the architecture of the Cloud-based Simulation (CSim) and the parallel simulation job scheduling in the CSim, should be addressed ï¬rst to make the CSim practical. This paper reports our recent work on the two issues. The...
Parallel simulations focus on conservative or optimistic algorithms to guarantee state consistency and causal order of messages between logical processes (LPs). It is usually hard for application domain users to develop complicated models for parallel simulations. For simplicity in large-scale artificial society, a modified DEVS component model is advocated in time-stepped parallel simulation with...
Cloud platform provides an infrastructure for resource sharing, software hosting and service delivering in a pay-per-use approach. To test the cloud-based software systems, techniques and tools are necessary to address unique quality concerns of the cloud infrastructure such as massive scalability and dynamic configuration. The tools can also be built on the cloud platform to benefit from virtualized...
Since the introduction of CUDA (Compute Unified Device Architecture), GPU (Graphics Processing Unit) was used in various fields rapidly. Some researchers used the GPU computing technology in remote sensing image processing, and revealed that one hundred times speedup could be obtained. Current GPU-based approaches need to load all the image data at a time prior to image processing. However, the current...
As services are dynamic discovered and bound in the open Internet environment, testing has to be exercised continuously and online to verify and validate the continuous changes and to ensure the quality of the integrated service-based system. During this process, testing strategies have to be adapted in accordance to the changes in the environment and target systems. Software agents are characterized...
DGIP (Distributed Geographic Information Processing) has become a new tendency of GIS (Geographic Information System) recently. DGIP focuses on how to organize and process a series of geographic resources in distributed computing environment and now existing research is mainly carried out from a global point of view. But it is noticeable that each computing node in distributed computing environment...
This paper firstly introduces the architecture of cellular relaying networks, and describes the additional handover scenarios in the networks. Then the handover model of cellular relaying networks is made, the traditional handover algorithm based on absolute threshold value and hysteresis level is introduced. On this basis, we propose a novel handover algorithm based on movement state for cellular...
The integration of services in heterogeneous, distributed grid environment is dynamic and diverse because of the disparate resources. Hence, this integration can be technically challenged due to the need of achieving various service when running on different platforms. So, in a grid environment, implementations of GIS (geographic information system) should not only concern their internal spatial characteristics,...
In this paper, we consider a relay-assisted cognitive cellular downlink system dynamically accessing a spectrum licensed to a primary network, thereby improving the efficiency of spectrum usage. A cluster-based relay-assisted architecture is proposed, where relay stations are employed for minimizing the interference to users in the primary network and achieving fairness for cell-edge users. Based...
Recently, there has been a fast proliferation of applications creating geospatial data distributed somewhere that has to be processed, queried and analyzed efficiently. Consequently, there is a need for effective data processing technologies that are able to support such distributed query and analysis operations. The emergence of grid computing offers a well solution to accomplish this goal. Development...
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