共查询到19条相似文献,搜索用时 78 毫秒
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通过对无线通信网络的体系结构,运营方式,切换技术实现细节等方面的分析,研究和探讨异构网络之间的切换技术,最终提出一个面向下一代无线通信网络的新型的基于IP的综合切换(IH)框架,以实现全球无线网络覆盖范围的低时延、高带宽、宽切换域、开销低和QoS保证的不同网络间顺畅的无缝切换。 相似文献
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毫微微小区(Femtocell)网络能够增强室内覆盖,提高系统容量,但是在频谱共享的正交频分多址(OFDMA)毫微微小区网络中,毫微微小区之间的同层干扰以及毫微微小区与宏小区(Macrocell)之间的跨层干扰严重限制了系统的性能。针对这两种干扰,该文提出一种基于分组的资源分配算法。该算法包括两部分:一部分是宏基站先利用改进的匈牙利算法为宏小区用户分配信道,再用注水算法分配功率,保证宏小区用户的正常传输;另一部分是在避免干扰宏小区用户的基础上,先采用模拟退火算法对毫微微小区进行分组,再进行信道和功率分配,满足毫微微小区用户的数据速率需求,最大化频谱效率。仿真结果表明,该算法有效地抑制了这两种干扰,既能保证用户的数据速率需求,又能有效提升网络频谱效率。 相似文献
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邻区关系的自动建立和更新作为SON另一个重要方面,直接影响到网络的整体性能和切换性能.网优的重要工作之一就是邻区关系的优化.本文基于传统的邻区列表优化方法,通过对TD-LTE协议的研究,提出一种新的邻区列表优化方法.首先基于正常的通信过程,添加未知小区的IP,并建立X2接口;然后根据X2接口和S1接口的参数,提出一种算法来解决遗漏和添加的小区列表,并且包括解决PCI冲突及PCI不稳定.仿真结果表明,该算法能够自动完成邻区列表更新,解决邻区列表的不合理配置,并且能够提高切换成功率,减小小区掉话率. 相似文献
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异构无线通信系统的融合机制和协同功率分配算法研究 总被引:1,自引:0,他引:1
该文提出了一种基于协同通信和无线中继技术的融合机制,以实现异构无线接入网的互联互通和融合。为了最大化所提异构协同网络方案的协同容量,从理论上给出了协同功率分配优化理论模型,并介绍了一种不同于传统注水理论的基于效用函数的协同功率分配算法,该算法在合理设置发射功率保证第1跳和第2跳链路的传输速率匹配的前提下能够优化系统性能。仿真结果表明所提协同功率分配算法有显著的性能增益。 相似文献
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相比传统的宏蜂窝网络,分层异构网络是实现系统容量增强的一种很有前景的技术。尽管如此,由于家庭基站与宏基站同频部署,且它们被随机部署,异构网络中的干扰可能会更强。为了提升网络吞吐量,本文研究了一种新型的基于进化博弈的小区附着算法,为最小化小区间干扰,提高网络吞吐量提供了理论参考。 相似文献
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In the paper,we propose a framework to investigate how to effectively perform traffic flow splitting in heterogeneous wireless networks from a queue point.The average packet delay in heterogeneous wireless networks is derived in a probabilistic manner.The basic idea can be understood via treating the integrated heterogeneous wireless networks as different coupled and parallel queuing systems.The integrated network performance can approach that of one queue with maximal the multiplexing gain.For the purpose of illustrating the effectively of our proposed model,the Cellular/WLAN interworking is exploited.To minimize the average delay,a heuristic search algorithm is used to get the optimal probability of splitting traffic flow.Further,a Markov process is applied to evaluate the performance of the proposed scheme and compare with that of selecting the best network to access in terms of packet mean delay and blocking probability.Numerical results illustrate our proposed framework is effective and the flow splitting transmission can obtain more performance gain in heterogeneous wireless networks. 相似文献
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VICTOR O.K. 《中国邮电高校学报(英文版)》2005,12(2)
1IntroductionWith the increasing demand for mobile access ,theInternet has to provide not only li mited mobility,suchas WLAN[1 ~3]access ,but also worldwide mobility,asexemplified by Mobile IP[4 ~7]to meet the user require-ments in terms of data rate and mobility.In particular ,it is desired that when a user stays in the hotspot cov-ered by WLAN, he can access the Internet throughWLAN,and when he goes out of the hotspot ,the on-going connection should not be dropped,but is insteadhanded … 相似文献
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针对能效提升、宏用户干扰减小的问题,该文研究了基于干扰效率最大的异构无线网络顽健资源分配算法.首先,考虑宏用户干扰约束、微蜂窝用户速率需求约束和最大发射功率约束,将资源优化问题建模为多变量非线性规划问题.其次,考虑有界信道不确定性模型,利用Dinkelbach辅助变量方法和连续凸近似方法结合对数变换方法,将原分式规划顽健资源分配问题转换为等价的确定性凸优化问题,并利用拉格朗日对偶算法获得解析解.理论分析了计算复杂度和参数不确定性对性能的影响.仿真结果表明该算法具有较好的干扰效率和鲁棒性. 相似文献
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文章提出了一种基于IPv6实现6LoWPAN和Zigbee两种异构协议通信的架构——6LoWPAN-IPv6-Zigbee。6LoWPAN-IPv6-Zigbee架构在分析异构节点互通问题的基础上,设计了协议转换、网关功能以及节点交互流程;基于现有的异构节点互通方案,设计了的异构节点互通场景、系统结构、协议转换模式以及网关功能;基于寻址、服务发现等互联互通关键技术,设计了异构节点交互流程。6LoWPAN-IPv6-Zigbee架构可为同时存在Zigbee节点与6LoWPAN节点的混合传感网络提供良好互通性。 相似文献
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With the advent of a myriad of wireless networking technologies, a mobile host today can potentially be equipped with multiple wireless interfaces that have access to different wireless networks. It is widely perceived that future generation wireless networks will exhibit a similar trend in supporting a large variety of heterogeneous wireless access technologies that a mobile host can choose from. In this paper, we consider such a multi-homed mobile host and propose an end-to-end solution that enables the seamless use of heterogeneous wireless access technologies. The unique features of the proposed solution include: (i) a purely end-to-end approach to handle host mobility that requires no support from the underlying network infrastructure, (ii) seamless vertical handoffs when the mobile host migrates from one access network to another, (iii) ability to support different congestion control schemes for a live connection traversing different interfaces, and (iv) effective bandwidth aggregation when the mobile host has simultaneous access to multiple networks. We present the design and details of the proposed approach, and evaluate its performance through simulations and real-life field experiments. 相似文献