基于最大独立链路集的随机虚拟网络映射算法

提出了一种基于最大独立链路集的快速随机虚拟网络映射算法.基于图论中的匹配理论重新定义了带权图中匹配的概念,并命名为独立链路集,在映射独立链路集中的虚拟链路时首先将物理链路按照资源可用性进行筛选,然后随机映射到单一物理链路上,以此提高虚拟网络映射成功率及减少链路映射消耗,同时随机映射能保证物理网络的负载均衡.仿真实验表明,该算法能有效减少链路映射的消耗和提高虚拟网络接受率.

设置C&C08机链路集选择应注意的问题

介绍C＆C08机链路集选择的相关概念及设置中应注意的问题。

吉安市七号信令网链路负荷不均的探讨与调整

简要介绍了信令网的链路负荷分担原理 ,并结合吉安市七号信令网络的基本现状 ,就链路负荷不均的问题提出了几点建议与解决方案。

SINR模型下链路调度问题的启发式算法

在SINR模型下研究了无线网络中与链路调度密切相关的两个重要的NP-完全问题:最大链路独立集(Maximum Independent Set of Links,MISL)和最大带权链路独立集(Maximum Weighted Independent Set of Links,MWISL),给出了对这两个问题有好的实际性能保障的有效启发式算法,从理论上证明了算法的正确性,并通过仿真验证了算法的有效性。对于MISL问题,在MTIR算法(Yang等人于2010年提出)的基础上,得到了性能更优的启发式算法MTBR;对于MWISL问题给出的有效启发式算法,比近似算法PMWISL(Wan等人于2011年提出)的性能有了较大的提高。

C&C08交换机准直联中继数据配置

七号信令消息经过两个或多个串接的信令链路传送,中间经过一个或几个STP,这种工作方式称为准直联。工作中准直联的应用较多,但数据配置容易与直联方式的数据配置混淆,下面分别就128模8K版本交换机SM侧与SPM侧的数据配置进行系统介绍。

A scalable topology aggregation algorithm for QoS routing in hierarchical networks

Topology aggregation is necessary for scalable QoS routing mechanisms. Thekey issue is how to gain good performance while summarizing the topological information. In thispaper, we propose a new method to describe the logical link, which is simple and effective innetwork with additive and constrained concave parameters. We extend the method to network associatedwith multi-parameters. Furthermore, we propose a modified star aggregation algorithm. Simulationsare used to evaluate the performance. The results show that our algorithm is relatively good.

Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems

Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback.

Inter-satellite Link Topology Design and Relative Navigation for Satellite Clusters

A distributed relative navigation approach via inter-satellite sensing and communication for satellite clusters is proposed. The inter-satellite link(ISL)is used for ranging and exchanging data for the relative navigation,which can improve the autonomy of the satellite cluster. The ISL topology design problem is formulated as a multi-objective optimization problem where the energy consumption and the navigation performance are considered. Further,the relative navigation is performed in a distributed fashion,where each satellite in the cluster makes observations and communicates with its neighbors via the ISL locally such that the transmission consumption and the computational complexity for the navigation are reduced. The ISL topology optimization problem is solved via the NSGA-Ⅱ algorithm,and the consensus Kalman filter is used for the distributed relative navigation. The proposed approach is flexible to varying tasks,with satellites joining or leaving the cluster anytime,and is robust to the failure of an individual satellite. Numerical simulations are presented to verify the feasibility of the proposed approach.

Opportunities from ICT for Agro-Food Supply Chains

Nowadays the situation of agro-food and rural sector in terms of markets, development and competitiveness and the specific impact that rural activities have in the society, added to the potential positive impact of new ICT technologies, has arisen new challenges. Support the European Agro-food industry to be a worldwide leader in the supply of high quality and safe food products. The relevance of agro-food industry is not only related to its importance in European economy but also is consequence of increase awareness concerning to the necessity of producing high quality and safe products. The implementation of the new technologies in agro-food domain, enabling adequate combination of traditional products and modern management processes will definitively contribute to produce high quality and safe products. Increase the level of involvement of consumers in the agro-food value chain by means of the wide adoption of relevant IC Technologies and applications. The agro-food sector is very much a consumer driven sector. However, in order to realise the full participation of citizens in the whole agro-food supply chain, further developments in ICTs are required. The incorporation of ICT tools will greatly contribute to achieving a deeper integration, communication and information flow between the different stakeholders in the supply chain, from ＂fork to farm＂, from farmers to consumers. Therefore, in first place the objective of the work is to analyze the opportunities offered by the ICT to implement the systems of traceability in the food system. In according to place the study wants to deepen the norm ISO22000, in which the ICT has a fundamental role to have a synthetic tool of guarantee and greater trust for the consumer. The purpose is to make a critical review of the existing literature on this matter in relationship to the agro-food systems.