Improved multipath routing with WNN for the open networks

Multipath routing mechanism is vital for reliable packet delivery, load balance, and flexibility in the open network because its topology is dynamic and the nodes have limited capability. This article proposes a new multipath switch approach based on traffic prediction according to some characteristics of open networks. We use wavelet neural network (WNN) to predict the node traffic because the method has not only good approximation property of wavelet, but also self-learning adaptive quality of neural network. When the traffic prediction indicates that the primary path is a failure, the alternate path will be occupied promptly according to the switch strategy, which can save time for the switch in advance. The simulation results show that the presented traffic prediction model has better prediction accuracy; and the approach based on the above model can balance network load, prolong network lifetime, and decrease the overall energy consumption of the network.     

LTE系统上行链路调度算法研究

长期演进(Long Term Evolution,LTE)已经成为4G无线技术标准。目前,LTE分组调度的下行链路调度被大多数研究者研究,上行链路的研究相对较少。针对上行链路调度无法保证实时业务分组在延迟期限内传输,存在公平性较差、分组丢弃多的问题。因此,提出了一种新的上行链路调度算法。该算法根据实时业务的延迟约束条件建立目标整数线性规划模型,再根据目标整数线性规划模型进行调度。实验结果表明,该算法能保证实时业务分组在延迟期限内传输,适用于实时业务,能确保公平性,最小化分组丢弃,具有较好的适用性。     

基于模糊识别的高速公路交通流诱导系统

针对高速公路交通拥挤和堵塞问题,提出用模糊诱导的方法,对采集的交通信息进行处理后,通过模糊识别的方法,认定其状态,将交通状态数据通过图形化的方法,发布给司乘人员,以达到交通管理的目的。首先分析了交通流状态的表达方法,然后设计出交通状态模糊识别的判断函数,并给出了交通状态模糊表达的处理方法。     

A Neural Network Method for Traffic Dispersion

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一种点对多点无线数据传输系统的设计

介绍了一种点对多点无线数据传输系统的设计,提出了一种基于时分多址的"随机延时"防通信碰撞协议,并给出了该防碰撞协议和相关CRC编码的软件实现方法。该系统可用于智能交通监管,也可用于其它实时性要求较高、但数据量不大的应用。     

基于移动通信的城市停车诱导信息系统设计

随着汽车保有量不断增加,停车难已成为城市交通普遍问题。从分析城市停车诱导系统功能和提高停车设施利用率的角度出发,结合实际城市交通情况,采用PGIS技术,提出一个整体性、实时动态的停车诱导信息系统。该系统设计通过仿真验证有效．因此将为城市交通管理控制、驾驶员出行提供更准确和有效的诱导决策辅助信息。     

Review and perspective on encrypted traffic identification research

Considering the importance of encrypted traffic identification technology and existing research work,first,the type of encrypted traffic identification according to the demand of traffic analysis were introduced,such as protocols,applications and services.Second,the encrypted traffic identification technology was summarized,and identification technology was compared from multiple views.Third,the deficiencies and the affecting factors of the existing encrypted traffic identification technologies were induced,such as tunneling,traffic camouflage technology,new protocols of HTTP/2.0 and QUIC.Finally,prospect trends and directions of future research on encrypted traffic identification were discussed.     

全球网络中立进展及对OTT的影响

随着互联网的普及，特别是移动互联网的日益广泛，网络中立问题仍然是热点问题，从美国逐步扩展到全球其他地区，如亚洲、欧洲和南美洲等。目前网络中立问题主要聚焦在对运营商网络管理策略合法性的争论之上，特别是对OTT服务的管理问题。由于OTT应用不断涌现，给电信运营商网络带来很大压力，多国运营商采取措施应对OTT。     

IP网流量工程的一种权值设置方法

提出一种新的基于传统路由协议的流量控制方法。该方法首先在不限制总流量条件下求解最小化最大连接利用率。然后在固定最大连接利用率条件下最小化总流量。由此求得最优流量分配方案并从其对偶问题中求出各连接的权值配置。实验结果显示，文中算法较现有算法明显降低最大连接利用率，并且增加了稳定性。     

Optimization of listening time of S-MAC for wireless sensor networks

In wireless sensor networks, sensor nodes are usually battery-operated computing and sensing devices, hence operations are limited by the initially equipped batteries, which are hard to be recharged or replaced. In this sense, saving energy consumption becomes significant. As most energy waste is from the always-on wireless interface, S-MAC is suggested to reduce energy consumption by introducing periodic listen/sleep scheme. However, when designing the listening time, S-MAC fails to consider the traffic distribution factor. In this article, an optimization for this scheme is proposed based on the distribution model. Evaluations show that the optimized S-MAC achieves considerable improvement in energy and latency.