可信度动态感知的间断连接无线网络数据转发机制

提出了一种节点可信度动态感知的间断连接无线网络数据转发机制,节点根据运动过程中所获知的局部网络状态信息以分布式的方式估计其他节点恶意度及协作度,并根据历史信息预测节点的连通状态,进而获知各个节点的信任程度,以合理地选择中继节点,实现高效的数据转发。仿真结果表明,所提出的机制能够有效提高数据传输的可靠性,并大幅降低网络负载率,提高网络资源利用率。     

社会属性感知的间断连接无线网络数据转发策略

间断连接无线网络中的节点具有极强的聚集特性,数据转发过程需要充分地考虑节点之间的社会关系。提出一种社会属性感知的数据分发策略,根据实时获取的多维网络状态参数,节点以分布式的方式估计其自身及其他节点的社会属性。进而确定数据携带节点与目的节点之间的关系,以最小化资源开销的方式实现数据转发。结果表明,与典型机制相比,所提出的数据转发策略具有较高的投递率和较低的延迟,有效地改善了网络性能。     

带有黑洞节点探测的间断连接无线网络数据转发机制

间断连接无线网络利用节点移动产生的通信机会完成数据传输,但网络中的恶意节点通过伪造节点的相遇信息等方法,吸引并丢弃数据,影响网络的运行。该文提出带有黑洞攻击探测的间断连接无线网络数据转发机制,通过节点诚信度、信用度、间接信任度及数据转发能力4维信任属性的评估,获知攻击节点的行为规律,并采用粗糙集理论降低网络运行过程中产生的不确定状态信息引发的误判率,更加准确地对节点的可信性进行判断,进而,合理地为数据选择中继节点。结果表明,所提出的方法能有效提升黑洞节点的辨识率,对网络中其它非协作行为也有一定探测和防御能力,能显著改善网络性能。     

恶意节点容忍的间断连接无线网络消息转发策略

间断连接无线网络中的节点以协作方式完成消息投递,恶意节点将严重影响网络性能。利用节点历史行为信息,该文提出一种恶意节点容忍的消息转发策略,节点结合直接观察信息与邻居节点的推荐信息,通过动态推荐声誉阈值感知节点恶意行为,进而利用证据理论量化节点信任度,从而检测网络中串谋及独立的恶意节点,为消息选择最优的转发节点。结果表明,在带有串谋的恶意攻击下,所提出的消息转发策略能准确检测出恶意节点,并显著提高消息投递率,改善平均时延。     

社区结构感知的间断连接无线网络路由机制

针对间断连接无线网络中消息投递成功率低的问题1依据网络中节点社会关系的差异性,提出了一种社区结构感知的路由机制.该机制根据节点在各个运动周期内的状态信息建立马尔可夫模型,以描述节点运动状态转换过程,进而以分布式的方式感知节点中心度,并以社区中心度为参数,采用社区标签交换方法对网络结构进行动态检测,最终利用社区内中心节点为中继辅助完成消息的转发.仿真结果表明,所提出的路由机制在投递率方面的性能改善程度接近90％,极大地优化了网络性能.     

基于动态获知节点状态的间断连接网络拥塞控制机制

间断连接网络中通常是利用多副本数据转发方式来提高数据成功投递概率;但多副本的数据转发易导致冗余数据副本出现的频率升高。对此,设计了动态获知节点状态的间断连接网络拥塞控制机制(SCCS,State-aware Congestion Control Strategy)。引入平滑数学模型,结合节点间的相遇历史信息,构造了效用函数,从而以间接获知网络信息的方式预测下一时刻网络的拥塞情况,进而以分布式的方式动态选择较为合适的中继节点,以更加合理地利用有限的网络资源。仿真结果表明:与当前性能较好的拥塞控制机制相比,该机制的数据成功投递概率更高,而网络负载率更低。     

节点相似度感知的社会化间断连接无线网络结构检测机制

间断连接无线网络中的节点采用"存储、携带、转发"的方式传输消息,网络中的节点具有较强的社会属性。该文提出一种基于相似度和标签传播的网络结构检测机制,节点以运动过程所经历的社区状态为依据,描述自身的中心度,进而,采用带有约束条件的标签传播方法,更新网络结构检测状态,最终完成社区结构划分。仿真结果表明,所提出的检测算法具有较高的准确性,适用于多种复杂网络结构。     

带有节点状态估计的间断连接无线网络缓存管理策略

针对间断连接无线网络中的节点缓存资源有限的问题,该文提出一种适用于间断连接无线网络的缓存管理机制。根据运动过程中所获得的网络状态信息,各个节点以分布式的方式估计给定节点与其他节点直接及间接连接状态、节点服务率以及节点连通强度,动态感知各个节点服务能力的差异,同时预测当前节点成功投递该消息的概率以感知消息的效用值,从而执行缓存管理操作。结果表明,与其他缓存管理机制相比,所提出的缓存管理机制不仅能够有效降低投递开销,同时大幅度地提高了消息成功投递率。     

浅析移动短消息的分流机制简

短消息是在无线网络中通过No．7信令网传送的一定长度的文本信息，具有方便、快捷等优点，目前所有短消息均是通过主叫用户归属的短消息中心接收／发送，     

暂态社区感知的ICWN数据转发机制

为了有效解决间断连接无线网络中的数据转发问题,提出了一种暂态社区感知的数据转发机制,运用半马尔可夫链模型描述节点在多个地理位置间的转移过程,预测节点在未来相遇的时间概率分布,确定节点相遇位置和时间,为下一跳中继节点的选择提供了理论依据。实验数值表明,与传统算法相比,所提机制能有效提高节点相遇预测的准确性,在数据成功投递率和传输时延等性能上都有较大的提升。     

Data forwarding incentive mechanism based on auction model in mobile social network

Abstract:A data forwarding incentive mechanism based on auction model in mobile social network was proposed.In this incentive mechanism,the first-price sealed auction mode was extended,the transaction mode of virtual currency payment was adopted,and the procedure of data forwarding between nodes was abstracted into the auction transaction model.Based on the node's resource state,the virtual currency and the data property,the evaluation function of data forwarding transaction was given,and then the node gives the corresponding price according to the evaluation function and game strategy.Through the game analysis,the Nash equilibrium solution of AMIM was found,and the lowest bidder,of which the bid price was lower than the evaluation of data forwarding request node would been selected as the service provider for this data forwarding.In this incentive mechanism,the rational mobile nodes were enforced to voluntarily participate in data forwarding cooperation to maximize their own interests.The simulation experiment shows that AMIM mechanism can effectively reduce the energy consumption and improve the success rate and efficiency of data forwarding in the whole network system.     

Game theory based forwarding control method for social network

With the rapid development of mobile communication and internet technology,the social network has become one of the mainstream social means used in people’s daily social life.To maintain and strengthen relationships with friends,users may share personal behavior and feelings through social networks.Forwarding these contents may result in privacy leakage.To help publishers make proper data forwarding decision,the benefits of both sides of the forwarding operation were analyzed,and a game theory based forwarding control method for social network was proposed which could effectively prevent dishonest data forwarding operation.By analyzing the benefits of both sides of forwarding operation and considering historical information,the probability of dishonest data forwarding operation was calculated and it was compared with the threshold set by publisher to make the forwarding decision.The procedure and framework of the game theory based forwarding control method was introduced.The benefits of both sides were defined and analyzed.The game play scenario was presented.Some results of experiments are shown to support that the method is effective and it can protect the security of content in social network.     

无线mesh网络中编码感知且负载均衡的组播路由

提出一种新的基于网络编码的负载均衡路由量度CRM-LB(coding-aware routing metric with load balancing),CRM-LB在CRM(coding-aware routing metric)的基础上增加了对路径p上所有节点通信密集程度与网络拥塞程度的考虑。进一步提出了基于CRM-LB的无线mesh网络多播路由CLR(coding and load-balancing routing)。该协议可以增加网络编码机会,同时考虑到网络中的负载均衡。通过性能分析和仿真实验表明,该协议在提高多播吞吐量的前提下,不仅能更好地支持网络编码,而且网络负载基本均衡。     

WSN中最小代价前向协议的研究与改进

对无线传感器网络（WSN）中的最小代价前向协议进行了研究，通过引入随机选择和数据融合功能改进原有协议。用跳数作为代价分析了改进后的协议性能，并进行计算机仿真，结果表明改进后的协议具有更低的网络负荷和更长的生命周期。     

A network coding based interference cancelation scheme for wireless ad hoc networks

The performance of wireless networks is limited by multiple access interference (MAI) in the traditional communication approach where the interfered signals of the concurrent transmissions are treated as noise. In this paper, we treat the interfered signals from a new perspective on the basis of additive electromagnetic (EM) waves and propose a network coding based interference cancelation (NCIC) scheme. In the proposed scheme, adjacent nodes can transmit simultaneously with careful scheduling; therefore, network performance will not be limited by the MAI. Additionally we design a space segmentation method for general wireless ad hoc networks, which organizes network into clusters with regular shapes (e.g., square and hexagon) to reduce the number of relay nodes. The segmentation method works with the scheduling scheme and can help achieve better scalability and reduced complexity. We derive accurate analytic models for the probability of connectivity between two adjacent cluster heads which is important for successful information relay. We proved that with the proposed NCIC scheme, the transmission efficiency can be improved by at least 50% for general wireless networks as compared to the traditional interference avoidance schemes. Numeric results also show the space segmentation is feasible and effective. Finally we propose and discuss a method to implement the NCIC scheme in a practical orthogonal frequency division multiplexing (OFDM) communications networks. Copyright © 2009 John Wiley & Sons, Ltd.     

基于网络编码的无线网络多流问题研究

多流问题研究多对源、宿节点之间所能达到的最大吞吐。在无线网络中,解决该问题的关键在于量化无线干扰。由于网络编码能够在一定程度上克服无线干扰的影响,因此通过使用超边来描述编码发送,并构造关于超边的冲突图,可以实现对网络编码条件下无线干扰（以协议干扰模型为例）的量化,进而解决网络编码条件下的多流问题。此外,针对在超边冲突图中搜集所有极大独立集的NP难问题,提出了一种实用的搜集算法,并给出了相关的数字结果。