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检索条件"机构=Beijing Key Lab of Network System Architecture and Convergence"

共 1150 条记录，以下是91-100 订阅

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Cooperative base station operation for green dense heterogeneous networks

Cooperative base station operation for green dense heterogen...

引用

IEEE Asia Pacific Conference on Wireless and Mobile, APWiMob 2015

作者： Chen, Yawen Wen, Xiangming Lu, Zhaoming Shao, Hua Cheng, Jie Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781479982905

Dense heterogeneous networks are deployed for future wireless communication to meet the explosively increasing traffic demand. However, the network densification leads to a great amount of energy consumption especially the operation energy consumption. In this paper, we consider cooperative Base station (BS) operation in downlink dense heterogeneous networks consisting of one macro BS and several small cell BSs (SBSs). Two sleep modes operating at different time scales are proposed to save energy based on the features of wireless traffic, i.e., traffic is rather stable in long term but fluctuates in short term. When work in deep sleep mode, physical infrastructure of SBSs like baseband and circuits are switched off. In opportunistic sleep mode, SBS optimally switch off some antennas and associated physical components and perform cooperative transmission for users. The proposed cooperative BS sleep strategy for dense heterogeneous networks takes both traffic features and cooperation transmission into account, and can achieve great energy saving while guarantee the quality of service (QoS) of users. © 2015 IEEE.

关键词： Energy conservation

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A simulated annealing algorithm for the transmission mode selection of multicast services in LTE networks

A simulated annealing algorithm for the transmission mode se...

引用

2011 14th International Symposium on Wireless Personal Multimedia Communications: Communications, networking and Applications for the Internet of Things, WPMC'11

作者： Wang, Min Feng, Chunyan Zhang, Tiankui Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781457717864

A simulated annealing (SA) algorithm is proposed for the transmission mode selection of multicast services in LTE networks. The multicast services can be transmitted by single frequency network (SFN) mode and point-to-multipoint (PTM) mode, and the unicast services are delivered with point-to-point (PTP) mode. To avoid the network congestion in LTE networks with the multicast and unicast mixed services, the demanded resources of the maximum load cell is minimized by selecting the optimal mode between SFN and PTM for multicast services. The transmission mode selection problem is solved by means of SA heuristics. Simulation results show that the proposed SA algorithm achieves less demanded resources of the maximum load cell than SFN mode for all the multicast services. © 2011 National Institute of Inform.

关键词： Simulated annealing

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An efficient and QoS-aware virtual network resource migration algorithm

An efficient and QoS-aware virtual network resource migratio...

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IEEE International Conference on Computer and Communications, ICCC 2015

作者： Ma, Lu Lu, Zhaoming Yu, Bangchao Wang, Luhan Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467381253

In this paper, a joint reducing energy consumption and improving quality of service scheme for the migration of virtual network resources is proposed. This migration algorithm reflects the state of the virtual network resources dynamically, and the algorithm consists of two parts: Energy-efficient Module and QoS Module. Each Module is responsible for a specific function. The Energy-efficient Module is responsible for the energy consumption of servers, and the QoS Module is responsible for the quality of network service, and it can optimize the target nodes with the relative cost of migration. The efficient and QoS-Aware migration algorithm take the energy consumption and the quality of service into account. The simulation results show that the proposed algorithm can reduce energy consumption to the servers, improve the quality of experience, reduce the latency and achieve the objectives of managing of virtual network quickly and easily. © 2015 IEEE.

关键词： Quality of service

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Two-staged load balancing mechanism in LTE self-organization networks

Two-staged load balancing mechanism in LTE self-organization...

引用

2nd International Conference on Mechanical Properties of Materials and Information Technology, ICMPMIT 2013

作者： Li, Li Zhang, Jing Jing Chen, Jian Ya Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9783037858608

In mobile communication system, the traffic is time-varying and unpredictable, so there will be some hot-spot cells. It means that, the number of service request is much higher than an acceptable level in some cells, which may result in call-blocking with a large probability. But in other cells of system there are still resources available to serve more users. How to avoid the imbalance to effectively improve the system's resource utilization is what load balancing need to solve. In this paper, a new kind of event-trigger mechanism using cell load status information exchange between eNBs via X2 interface is presented. Additionally, based on it, a novel load balancing algorithm, named TSLB(two-staged load balancing), for LTE systems is put forward. Using this algorithm, eNBs can start corresponding load balancing procedure accurately according to the cell load status in real-time without any manual intervention. Simulation results show that the method is valid and it can increase the system throughput significantly as well as decrease the network delay. © (2013) Trans Tech Publications, Switzerland.

关键词： Cells

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Multi-relay selection scheme based on quantum particle swarm optimization in relay networks

Multi-relay selection scheme based on quantum particle swarm...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Cao, Jinlong Zhang, Tiankui Zeng, Zhimin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

Multi-relay selection scheme for cooperative relaying considering the signal to noise ratio (SNR) maximization and power efficiency optimization is proposed in this paper. In cooperative relay networks, the selected relay nodes have great impact on the system performance. It is an optimization problem for best cooperative relay node number and which relay nodes are selected. The exhaustive search can solve this problem but the complexity will increase exponentially with the network size, i.e., the number of relays in the network. This paper proposes two novel quantum particle swarm optimization (QPSO) based relay selection schemes with the SNR optimization target and power efficiency target respectively. Simulation results show that the QPSO-based multi-relay selection scheme has the ability to search global optimal solution compared with other multi-relay selection algorithm in literature. © 2012 NiCT.

关键词： Particle swarm optimization (PSO)

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A Bi-direction hybrid routing algorithm in mobile hybrid wireless networks 10

A Bi-direction hybrid routing algorithm in mobile hybrid wir...

引用

10th International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2014

作者： Li, Xiaolong Hao, Jianjun Guo, Yijun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781849198455

In this paper, we propose an efficient routing algorithm based on AODV for the Mobile Hybrid Wireless networks (MHWNs), which consists of the mobile ad hoc networks (MANETs) and an infrastructure wireless networks (such as cellular networks). In MANETs, the performance of the networks has been greatly challenged by the mobility from nodes and link state changes, while the link in cellular networks remains stable link with the mobile stations. This algorithm for routing construction takes advantage of the features of MHWNs, such as hybrid radio channels and nodes heterogeneity, to accomplish the bi-direction routing discovery on demand. Our results show that the performance of MHWNs is improved in the time and overhead for route path discovery process the under our bi-direction route algorithm.

关键词： Routing algorithms

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Opportunistic energy harvesting and energy-based opportunistic spectrum access in cognitive radio networks 1

引用

10th International Conference on Cognitive Radio Oriented Wireless networks, CROWNCOM 2015

作者： Yao, Yuanyuan Song, Xiaoshi Yin, Changchuan Huang, Sai Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9783319245409

ISBN: (纸本)9783319245393

The performance of large-scale cognitive radio (CR) networks with secondary users self-sustained by opportunistically harvesting radio-frequency (RF) energy from nearby primary transmissions is investigated. Using an advanced RF energy harvester, a secondary user is assumed to be able to collect ambient primary RF energy as long as it lies inside the harvesting zone of an active primary transmitter (PT). A variable power (VP) transmission mode is proposed, and a simple energybased opportunistic spectrum access (OSA) strategy is considered, under which a secondary transmitter (ST) is allowed to transmit if its harvested energy is larger than a predefined transmission threshold and it is outside the guard zones of all active PTs. The transmission probability of the STs is derived. The coverage probabilities and the throughputs of the primary and the secondary networks, respectively, are characterized. The throughput can be increased by as much as 29%. Simulation results are provided to validate our analysis. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2015.

关键词： Cognitive radio

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A NOVEL USER-CENTRIC COMP SCHEME FOR ENERGY EFFICIENCY OF DENSE HETEROGENEOUS network 5

A NOVEL USER-CENTRIC COMP SCHEME FOR ENERGY EFFICIENCY OF DE...

引用

2016 5th IEEE International Conference on network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Xueying Li Hailun Xia Zhimin Zeng Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

In this paper,we investigate a user-centric Coordinated Multiple Point(CoMP) transmission scheme to improve Energy Efficiency(EE) in dense Heterogeneous network(HetNet),which takes advantage of both Dynamic Point Reduced Power(DPRP) and Joint Transmission(JT).DPRP with a user voting method rather than Dynamic Point Blanking(DPB) is introduced to fully use the power while reducing energy consumption and mitigating inter-cell *** pattern of reducing power is decided in a user-centric ***,CoMP user equipments(CUEs) report to two base stations(BSs) to inform their urgency of CUEs to reduce *** the BSs reduce power on some resource blocks(RBs) which affect most UEs so as to get EE *** with overlapping cooperation set is applied only to the CUEs to improve their throughput,therefore not bringing too much pressure to *** cooperation set of JT is decided by CUEs instead of the location of BSs to better adapt to the requirement of *** results show that the scheme we proposed can improve EE obviously without leading to too much drop in user throughput.

关键词： CoMP Power allocation Dense heterogeneous network Energy efficiency

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Adversarial Samples Defense Strategy Based on Service Orchestration 8

Adversarial Samples Defense Strategy Based on Service Orches...

引用

8th IEEE International Conference on Computer and Communications, ICCC 2022

作者： Zhang, Mengxin Qiu, Xiaofeng Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing China

ISBN: (纸本)9781665450515

Deep neural networks (DNNs) are playing an increasingly significant role in the modern world. However, they are weak to adversarial samples that are generated by adding specially crafted perturbations. Most defenses against adversarial samples focused on refining the DNN models, which often sacrifice the performance and computational cost of models on benign samples. In this paper, we propose a manifold distance detection method to distinguish legitimate samples and adversarial samples by measuring the different distances on the manifold. The manifold distance detection method neither modifies the protected models nor requires knowledge of the process for generating adversarial samples. Inspired by the effectiveness of the manifold distance detection, we demonstrated a well-designed orchestrated defense strategy, named Manifold Distance Judge (MDJ), which selects the best image processing method that will effectively expand the manifold distance between legitimate and adversarial samples, and thus, enhances the performance of the following manifold distance detection method. Tests on the ImageNet dataset, the MDJ is effective against the most adversarial samples under white-box, gray-box, and black-box attack scenarios. We show empirically that the orchestration strategy MDJ is significantly better than Feature Squeezing on the recall rate. Meanwhile, MDJ achieves high detection rates against CW attack and DI-FGSM attack. © 2022 IEEE.

关键词： Neural network models

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Video quality assessment based on Fast Structural Similarity index algorithm

Video quality assessment based on Fast Structural Similarity...

引用

4th International Conference on Ubiquitous and Future networks, ICUFN 2012

作者： Liu, Zhen Sun, Yong Zhang, Jingjing Wen, Xiangming Su, Tao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467313773

Objective quality measures play important roles in fast image and video quality assessment (VQA). In the paper, a Fast Structural Similarity (FSSIM) index algorithm, which modifies Structural Similarity (SSIM) to achieve a high speed of execution, is used to assess the quality of real-time video application. The experimental results show that the FSSIM index algorithm not only has competitive performance with normal SSIM for assessing video quality, but also has much lower computational complexity. © 2012 IEEE.

关键词： Computational complexity

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