2.4GHz MIMO 网状网络中一种固定信道分配方法（英文）

由于无线网路中链路质量的不稳定、信号的广播传输模式和节点之间存在的相互干扰，针对提高无线网状网络性能的信道分配和路由选择将更加复杂。采用多信道成为一种可选的提高网络容量的方法。本文提出了一种基于2.4GHz 802.11无线网状网络的一种固定信道分配方法，采用了多输入多输出技术使得网络中的数据流以流水线的方式进行传输。在这个场景下多条并行的流可以同时被激活，以此来提升UDP和TCP的传输性能。通过对802.11b网络中1、6和11三个相互不重叠的信道的分配，该信道分配算法在空间上实现邻居节点之间的干扰最小化，其中信道1和11被分配给网状网络的主干传输部分，信道6被分配给用户接入网络。文章最后通过NS2仿真实验，并对本文提出的算法进行了分析。实验结果证明网络的平均吞吐率有大幅度提升，且多跳传输的延迟也被降低。     

MEIL――一种高吞吐量的无线网状网路由协议

由于无线网状网具有多网卡多信道，节点移动性低等特性，使用传统的基于最短路径的移动Ad Hoc网络路由协议并不能获得良好的性能。为此本文提出了一种新的无线网状网路由协议――MEIL算法，通过引入链路干扰度，节点负载度等概念，综合考虑了无线信道的丢包率，链路干扰以及节点的负载等多种重要因素，来确定路由判据，选择链路质量好、干扰小、负载轻的路径来传输数据，有效地提高了网络吞吐量。仿真结果表明，MEIL算法比AODV路由协议和DSDV+ETX算法更适用于无线网状网，在各种业务环境下其吞吐量，时延，到达报文量等性能均具有更好的效果。     

资源预留模式在实时操作系统中的一种实现

基于红旗实时操作系统的研发实践,描述了实时操作系统资源预留模式的设计与实现过程。集中描述了基于资源预留和资源集合的基本概念、资源预留模式的主要实现思想及其重要的数据结构。这种资源预留模式基于资源内核的思想,其主要目标是为事先申明其资源需求的特定应用程序预留特定数量的系统资源。     

LTE网络中头标压缩的上下文转移机制

提出了一种用于LTE网络中头标压缩功能的上下文转移方案,可以用来减小无线链路上的报文开销,降低切换时的信令时延,从而提高整个通信网络的效率. 文中对头标压缩的上下文转移过程进行了详细描述,包括信令报文的处理、上下文转移参数的重建以及头标压缩状态的变迁. 通过仿真分析,对方案的有效性进行了验证.该方案适用于语音通信为主的无线通信网络.     

基于MANET环境下的小波分形插值的QoS控制方法

移动无线自组网络，通过多跳接入Internet，卫星网和第三代移动系统，构成了下一代无线Ad-hoc互联网，实现了异构网络的融合和资源共享。在下一代移动无线网络环境下，带宽和功率受限，存在着各种传输误差。根据这些特性，本文采用基于方向的小波分形的插值算法，提出了一种适用于移动无线Ad-hoc网络的视频传输的服务质量（Quality of Service,简称QOS）控制方法，模拟结果表明，该算法与现存算法（双线性内插）相比，具有更优的性能（信噪比），并能适应网络带宽的动态变化。     

基于QoS的网络多媒体信息检索系统

当用户在网络上进行多媒体信息检索的时候，考虑服务质量(QoS)标准问题，会显著提高检索的质量和效率。本文基于这种思考提倡建立一个基于QoS的网络多媒体信息检索系统。首先描述一个多层QoS模型和多媒体信息的分布式网络结构，接着提出一个从用户角度而言首选的信息筛选过程，即QoS筛选过程，然后具体介绍基于QoS的网络多媒体信息检索系统的实现过程。     

车辆网络中基于网络编码机会的调度算法

证明在车辆网络中应用网络编码,其广播容量最大化问题是NP难的;提出一种基于最大编码机会的优化调度算法. 该算法结合网络编码与车辆缓存提供的编码机会,有效提高了广播容量. 结果表明,与贪婪算法相比,该算法获得更大网络编码增益,保证了一定的传输公平性.     

基于Mobile IPv6的3G-WLAN网络切换策略研究

3G移动通信系统可以满足用户随时随地更快速的传输多媒体应用与实时性服务的需求,而IEEE的802.11无线网络则可以为用户提供涵盖范围较小、高速的数据传输环境。因此将两种传输技术结合为用户提供快速无缝接入的通信能力,并能在这两种传输技术间快速的切换,有着重大的现实意义。考虑到无线传输的环境中,用户对移动性的需求较高,因此本文以3GPP制定的3G与WLAN整合架构为基础,提出一种基于移动IPv6的异构网络快速切换策略,以减少用户在移动过程中所造成的服务中断和数据包丢失问题。     

基于动态最短路径策略的多QoS路由算法

对FallBack算法进行改进,先利用动态最短路径算法计算出最短路径,然后对路径进行QoS需求检查,最后进行调整,得到动态环境下具有多QoS保证的最优路径。该算法在一定程度上克服了路由信息不能得到及时更新所引起的问题,根据网络拓扑结构变化和流量的变化动态调整路由选择,从而更好地保证了服务质量。最后将此策略引入到OSPF路由协议中,提出一种综合性的路由更新机制,在尽可能最少的网络负载下满足QOS对链路状态信息的要求,从而在一定程度上扩展了OSPF路由协议的服务质量。     

Blockchain-enabled wireless communications: a new paradigm towards 6G

With the deployment of fifth-generation (5G) wireless networks worldwide, research on sixth-generation (6G) wireless communications has commenced. It is expected that 6G networks can accommodate numerous heterogeneous devices and infrastructures with enhanced efficiency and security over diverse, e.g. spectrum, computing and storage, resources. However, this goal is impeded by a number of trust-related issues that are often neglected in network designs. Blockchain, as an innovative and revolutionary technology that has arisen in the recent decade, provides a promising solution. Building on its nature of decentralization, transparency, anonymity, immutability, traceability and resiliency, blockchain can establish cooperative trust among separate network entities and facilitate, e.g. efficient resource sharing, trusted data interaction, secure access control, privacy protection, and tracing, certification and supervision functionalities for wireless networks, thus presenting a new paradigm towards 6G. This paper is dedicated to blockchain-enabled wireless communication technologies. We first provide a brief introduction to the fundamentals of blockchain, and then we conduct a comprehensive investigation of the most recent efforts in incorporating blockchain into wireless communications from several aspects. Importantly, we further propose a unified framework of the blockchain radio access network (B-RAN) as a trustworthy and secure paradigm for 6G networking by utilizing blockchain technologies with enhanced efficiency and security. The critical elements of B-RAN, such as consensus mechanisms, smart contract, trustworthy access, mathematical modeling, cross-network sharing, data tracking and auditing and intelligent networking, are elaborated. We also provide the prototype design of B-RAN along with the latest experimental results.     

QoS在网络中的应用

QoS(Qouality of Service)用于衡量一个服务在网络中使用的服务质量。随着计算机网络和业务的不断扩展,网络中的新型业务和应用如视频会议、FTP文件服务、电话会议对网络资源都有更高的要求,如何满足一个网络中不同业务的资源要求成为一个有待急需解决的问题。这就催生网络QoS服务业务的快速发展。     

Optimization and label propagation in bipartite heterogeneous networks to improve transductive classification of texts

Transductive classification is a useful way to classify texts when labeled training examples are insufficient. Several algorithms to perform transductive classification considering text collections represented in a vector space model have been proposed. However, the use of these algorithms is unfeasible in practical applications due to the independence assumption among instances or terms and the drawbacks of these algorithms. Network-based algorithms come up to avoid the drawbacks of the algorithms based on vector space model and to improve transductive classification. Networks are mostly used for label propagation, in which some labeled objects propagate their labels to other objects through the network connections. Bipartite networks are useful to represent text collections as networks and perform label propagation. The generation of this type of network avoids requirements such as collections with hyperlinks or citations, computation of similarities among all texts in the collection, as well as the setup of a number of parameters. In a bipartite heterogeneous network, objects correspond to documents and terms, and the connections are given by the occurrences of terms in documents. The label propagation is performed from documents to terms and then from terms to documents iteratively. Nevertheless, instead of using terms just as means of label propagation, in this article we propose the use of the bipartite network structure to define the relevance scores of terms for classes through an optimization process and then propagate these relevance scores to define labels for unlabeled documents. The new document labels are used to redefine the relevance scores of terms which consequently redefine the labels of unlabeled documents in an iterative process. We demonstrated that the proposed approach surpasses the algorithms for transductive classification based on vector space model or networks. Moreover, we demonstrated that the proposed algorithm effectively makes use of unlabeled documents to improve classification and it is faster than other transductive algorithms.     

基于遗传算法的QoS路由优化算法

由于一些像远程视频会议之类的新服务要求更好的服务质量,多媒体通信路由算法需要使用多个QoS的参数。然而解决QoS路由问题、搜索两个无关参数的可行路径是一个NP完全问题。提出了一种基于遗传算法的QoS路由算法。仿真实验结果表明,该算法具有很好的性能并且为多约束QoS路由问题的求解提供了一种有效的途径。     

空间通信网中音视频传输的应用层QoS控制与测试方法

分析了无线局域网、因特网和Ku频段卫星通信网的互联互通及服务质量(QoS)性能参数,采用视频帧率、分辨率自适应算法,提出了一种空间通信网中音视频传输的应用层QoS控制与测试方法.仿真实验结果表明,该方法提高了网络利用率,并具有良好的QoS自适应帧率调整能力.     

三种无线传感器网络密钥性能评价

介绍了无线传感器网络及密钥管理性能评价指标并着重介绍了三种比较典型的密钥管理方案。密钥管理方案是无线传感器网络最主要的安全保障之一,方案设计得好坏直接影响着无线传感器网络的信息安全和信道的畅通。     

A cognitive TV white space-broadband power line MIMO system for indoor communication networks

Broadband power line communication (BPLC) is a promising solution to satisfy the growing data rate demands for broadband indoor communication networks. However, the BPLC transmission power spectral density (PSD) is restricted in the very high frequency (VHF) band to avoid harmful interference to the existing wireless services. In this paper, a new hybrid system is proposed utilizing BPLC and cognitive radio over TV white space (TVWS) to enhance the system capacity over BPLC in VHF, forming a VHF TVWS BPLC multiple-input multiple-output (MIMO) system. An iterative precoding algorithm is proposed to satisfy the interference limit at the TV primary user (PU) receiver (Rx) and enhance the ergodic capacity. Moreover, a power allocation algorithm is developed for the MIMO system to achieve the maximum ergodic capacity subject to the average total power constraint and limit of interference to TV PU. Simulation results demonstrate the significant enhancement in the achieved capacity by our proposed system in the VHF band compared to both previous cognitive and hybrid BPLC systems.     

基于WLAN技术的高校宿舍校园网研究

在讨论无线局域网优势的基础上,提出了将有线网络和无线网络相结合的方案,文章结合某高校校园网具体情况,对AP的布放位置进行了详细的规划,并对整个网络的性能进行了分析和测试.     

Mobile edge computing based QoS optimization in medical healthcare applications

Emerging trends in mobile edge computing for developing the efficient healthcare application such as, remote monitoring of the patients with central electronics clouds (e-Clouds) and their increasing voluminous multimedia have caught the attention of everyone in industry and academia. So, clear visualization, big sensing level, and better quality of service (QoS) is the foremost priority. This paper proposes the window-based Rate Control Algorithm (w-RCA) to optimize the medical quality of service (m-QoS) in the mobile edge computing based healthcare by considering the network parameters for instance, peak-to-mean ratio (PMR), standard deviation (Std.dev), delay and jitter during 8 min medical video stream named “Navigation to the Uterine Horn, transection of the horn and re-anastomosis’ transmission over 5 G networks. The performance of the proposed w-RCA is evaluated and compared with the conventional battery smoothing algorithm (BSA) and Baseline by using MPEG-4 encoder for optimizing m-QoS at the source or the server side. The experimental results demonstrate that the w-RCA outperforms the BSA and Baseline by optimizing QoS in remote healthcare application i.e., Tele-surgery. Besides, it is observed and analyzed that w-RCA produces better and effective results at small buffer and window sizes unlike BSA and Baseline by adopting large buffer size during QoS optimization.     

一种联合HII和OI的上行干扰协调方法

针对LTE无线通信系统上行链路,提出一种联合HII和OI的干扰协调方法.与以往提高整个网络吞吐量或小区边缘用户速率为目标的传统干扰协调方法不同,该方法从满足用户的实际通信质量要求出发,以提高用户满意度为目标,并首次联合使用了LTE R8标准定义的2个信息(高干扰指示HII和过载指示OI)进行频域协调和功率调整.仿真结果表明,该方法相比传统的干扰协调方法能明显提升用户满意度,具有较高的实用价值.     

模糊逻辑在下一代通信网络接入控制设计中的应用

研究了智能技术中的模糊逻辑在下一代OFDM通信网络接入控制中的应用,分析比较了几种典型的呼叫接入控制法在不同的数据及会话类业务及不同业务强度的情况下的阻塞率。仿真分析表明模糊逻辑接入控制法与基于门限法及基于队列信息接入控制法相比,具有更高的带宽利用率。