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Large-scale disasters (such as earthquake, flood, tornado) may cause severe network failures, leading to massive disruptions and data loss. Particularly, the aftermaths of disasters may further threaten the residual network and impact the existing/survived service connections. In this paper, we study a reliability based restoration scheme for recovering the impacted (disrupted and/or reliability-decreased)...
This paper investigates interference coordination for 3-dimension (3D) antenna array systems in multicell multiple-input multiple-output (MIMO) and orthogonal frequency division multiple-access (OFDMA) wireless networks. Cell-center user and cell-edge user specific downtilts are accordingly partitioned through dynamic vertical beamforming in the 3D MIMO-OFDM communication systems. Taking these user...
In long term evolution (LTE) downlink indoor scenarios, we study an inter-cell interference coordination (ICIC) by interacting the relative narrow-band transmit power (RNTP) indicators among evolved NodeBs (eNBs). Assuming the data symbols of each user is only known by one eNB, a novel RNTP-based resource block (RB) allocation scheme is presented and carried out in two steps: 1) Each eNB partitions...
Pay-per-use infrastructure for large cloud computing which host hundreds of thousands of applications face the challenge of the rate of resource utilization, resource management is therefore an important feature to enable scale-up during high load of resource pre-reservation. We focus on the problem of low utilization rate of pre-reserved resources and high cost for resource management. We propose...
Due to the importance in organization management and cost research, how to allocate a fixed cost across a set of competing units in an equitable manner draw more and more attention. Cook and Zhu proposed an approach with data envelopment analysis (DEA) efficiency invariance principle to solve such allocation problems, but we will present their model does not consider the effect caused by the allocated...
In view of existence problems in present Educational resource management system, Educational resources management platform based on the knowledge management was supplied in this paper. And the overall construction design proposal of Platform was given. The characteristics of knowledge management and the function of each component in the structure is analyzed. Knowledge Evaluation and knowledge ranking...
Currently, there are three mainly ways (auction, bidding and listing) to pay for the using of state-owned land which differ in their characteristics and the scope of application as well as some inevitable drawbacks. Under such circumstances, government's ability to regulate and control the land market is relatively weak. In view of the above shortcomings, we introduce a new land auction in this paper,...
Mobility model and call admission control (CAC) algorithm are important for wireless mobility networks. This paper firstly sets a practical mobility model, and then presents a novel measurement-based CAC algorithm utilizing time series analysis under the random model. The algorithm updates the reservation threshold by directly forecasting the next possible number of handoff dropping calls, using ARMA...
Orthogonal frequency division multiplexing (OFDM) technique is capable of suppressing inter-symbol interference (ISI) caused by multi-path propagation, confronting multi-path fading and improving the efficiency of spectrum resource. Dynamic resource reallocation algorithm is a kind of important technology in OFDM system and plays a key role in improving the spectrum of OFDM effectively. Based on the...
We consider the multi-user discrete bit loading problem in OFDMA systems with objective and constraints in terms of ergodic rates and powers. This differs from most existing techniques, which allocate rate and power according to instantaneous constraints and channel conditions. The maximum weighted ergodic sum-rate optimization problem is non-convex in general, but a dual decomposition results in...
In this paper, we address the optimal power allocation problem for minimizing the notion of information theoretic outage for an M parallel block-Rayleigh-fading channels using a finite rate power codebook (limited feedback). In contrast to the existing literature on outage minimization for MIMO systems with limited feedback, we derive effective approximations to the channel quantization regions in...
We consider the discrete bit loading problem in OFDM systems with objective and constraints in terms of ergodic rates and powers. This differs from almost all existing techniques, which allocate rates and powers using instantaneous channel gains. The resulting optimization problem is still convex in the single user case, and a dual decomposition is employed along with a tailored approach to the discrete...
Traditionally, the channelization structure in IEEE 802.11-based wireless LANs has been fixed: Each access point (AP) is assigned one channel and all channels are equally wide. In contrast, it has recently been shown that even on commodity hardware, the channel-width can be adapted dynamically purely in software. Leveraging this capability, we study the use of dynamic-width channels, where every AP...
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