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In this paper, load balancing is defined as the process of allocating workload to reduce the mean job waiting time. In a distributed multi-server system, load balancing is a challenging task if there is no central coordination or time-synchronization among users. In this paper, we present a queuing model for a distributed asynchronous multi-server system. To realize load balancing, we propose a distributed...
In this paper, the joint resource scheduling strategies in a full-duplex cellular system are studied. In the system, the base station (BS) is enabled full-duplex transmission, while the user equipments (UEs) are still traditional half-duplex. Firstly, we propose a binary-integer programming problem concerning cell throughput and solve it through exhaustive search algorithm. Furthermore, considering...
Smart devices bring us the ubiquitous mobile accessing to Internet, making mobile Internet grow rapidly. Using the mobile traffic data collected at core metropolitan 2G and 3G networks of China over a week, this paper studies the mobile user behavior from three aspects: 1) data usage; 2) mobility pattern; and 3) application usage. We classify mobile users into different groups to study the resource...
NoSQL (Not only SQL) data stores become a vital component in many big data computing platforms due to its inherent horizontal scalability. HBase is an open-source distributed NoSQL store that is widely used by many Internet enterprises to handle their big data computing applications (e.g. Facebook handles millions of messages each day with HBase). Optimizations that can enhance the performance of...
Nowadays, data storage and management has become an increasingly significant issue in the world of big data. With its density increasing and price declining, NAND flash has become a ubiquitous storage media in both enterprise and academic community. Flash chips are usually encapsulated into Solid State Drives (SSDs) by the Flash Translation Layer (FTL). SSDs exhibit the same interface as hard disk...
in this paper, a new uplink channel-aware scheduling algorithm is proposed to improve the cell throughput and cell-edge user throughput for 3GPP Long Term Evolution Advanced (LTE-A) in case of equal power allocation among subcarriers. The target is to maximize the priority-sum under the constraint of limited power of User Equipment (UE). For the purpose, the algorithm to determine the reallocated...
In this paper, we focus on the subcarrier allocation in the uplink of long term evolution advanced (LTE-A) system assuming equal power allocation among subcarriers. Our goal is to maximize the priority-sum in the uplink considering the power limitation of User Equipment (UE). For the purpose, the method to determine the reallocated RBs set and the optimization procedures of reallocated RBs are proposed,...
Single-carrier frequency division multiple access (SC-FDMA) has been selected as the uplink access scheme in the UTRA Long Term Evolution (LTE) due to its low peak-to-average power ratio properties. Nevertheless, in order to achieve such a benefit, it requires a localized allocation of the resource blocks (RBs), which naturally imposes a severe constraint on the scheduler design. In this paper, two...
Efficiency audit is not only the needs of transformation of the internal audit from traditional to modern, but also the inevitable trend of development of an internal audit in China nowadays. Verity and legitimate are the bottom line, the goal is the enhancement of economic efficiency, efficiency audit refers to the nature of the use of resources. In this paper, aiming at the important direction of...
In this paper, we investigate the outage performance of dual-hop relay networks with co-channel interference which is a major problem in the cellular radio system. A more realistic channel fading model for micro-cellular radio network is adopted as follows, and the desired signal is assumed to have Rician fading due to the presence of line-of-sight (LOS) propagation and the interfering signals from...
Land consolidation has played an important role to improve the land utilization and the ecological environment as well to promote the sustainable use of land resources. The scientific, rationality of land consolidation has significant function to the overall efficiency. This paper reviewing some recent advances in methods of evaluation in land consolidation, combining with the projects feature, using...
The Web service resource framework (WSRF) announced in January 2004 is a new mechanism to express how web services interact with the stateful resources, and it has achieved the fusion of Web services and grid services. For the grid application development, WSRF.NET is much easier than Globus Toolkit 4 and it is based on Windows. As WSRF.NET doesn't provide an available scheduler, we introduce Condor...
This article gives a detailed description of the Condor system-a distributed scheduler. A typical Condor system consists of four components: A Condor pool, the central manager, submitting machine and execution machine. The ClassAd is a flexible representation of the characteristics and constraints of both machines and jobs in the Condor system. Matchmaking is the mechanism by which Condor matches...
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