异构无线网络中网络选择策略与协作中继技术研究

发布时间：2018-06-03 23:15

本文选题：异构无线网络 + 网络融合　；参考：《苏州大学》2016年博士论文

【摘要】：随着各种无线接入技术的不断涌现与发展,无线网络间交叠覆盖、相互补充,形成了一个混合的无线网络——异构无线网络。为实现异构资源的优势互补与协同管理,异构无线网络的融合与协同是未来移动宽带无线通信的发展趋势。不同无线接入网络之间的融合将面临诸多技术问题,如联合无线资源管理、异构多模终端与接入选择机制、软件无线电与重配置技术等;而协作中继技术对于实现异构无线接入网络的协同非常关键,研究内容包括中继节点的功率分配与资源分配、协作编码、中继选择策略等。为构建先进的无线通信网络,异构无线网络融合与协同的关键技术一直是移动无线通信领域的研究热点。本论文针对异构无线网络环境中移动终端可能处于多个不同无线接入网络重叠覆盖的区域、或者移动终端有可能因地理位置或衰落等原因无法连接到基站两种情况,分别对异构无线网络中网络选择策略与协作中继技术进行了深入研究,主要体现在:1、在异构无线网络选择算法中,针对效用函数规范化指标数据时未考虑移动终端实时状态对效用函数参数的影响问题,提出了一种基于模糊推理系统的效用函数参数设置方法。通过仿真实验分析,考虑剩余电量对耗电量效用的影响,终端用户能够在不同剩余电量情况下更加合理的使用终端电能;而考虑终端移动速度对终端驶离所在网络需要移动的距离的影响,可减少移动终端的切换次数,提高系统性能。2、在异构无线网络选择过程中,针对采用补偿性多属性决策方法而接入伪最优网络(整体性能最优,个别指标性能最差)的问题,分析了SAW、TOPSIS、GRA、MEW四种方法接入伪最优网络的产生原因,提出了基于MEW与组合权重的无线网络选择算法。该算法能够较好地避免移动终端接入伪最优网络,在均衡网络负载及减少网络乒乓效应方面的性能均优于其它三种方法。3、在固定的数据速率下,以最小化系统总功率为优化目标,研究了单向多中继传输系统中中继定位和功率分配的联合优化问题。在没有最优解的情况下,推导了两中继情况下中继定位和功率分配的联合优化的次优解决方案的表达式。然后,分析了单向N(N1)中继传输的中继定位和功率分配问题,并将解决方案扩展到单向N(N1)中继的情况。仿真结果验证了方案的可行性。4、基于模拟网络编码的双向协作中继传输的原理,推导了双向两中继情况下中继定位和功率分配的联合优化的解决方案的表达式,并将解决方案推广到双向N(N1)中继的情况,包括中继数目为偶数与奇数两种情况。仿真结果验证了方案的可行性。
[Abstract]:With the emergence and development of various wireless access technologies, wireless networks overlap and complement each other, forming a hybrid wireless network-heterogeneous wireless network. In order to realize the complementary advantages and collaborative management of heterogeneous resources, the integration and collaboration of heterogeneous wireless networks is the development trend of mobile broadband wireless communication in the future. The convergence of different wireless access networks will face many technical problems, such as joint radio resource management, heterogeneous multi-mode terminal and access selection mechanism, software radio and reconfiguration technology, etc. The cooperative relay technology is very important to realize the cooperation of heterogeneous wireless access networks. The research contents include power allocation and resource allocation of relay nodes, cooperative coding, relay selection strategy and so on. In order to construct advanced wireless communication network, the key technology of heterogeneous wireless network fusion and collaboration has been a hot topic in the field of mobile wireless communication. In this paper, the mobile terminal may be located in multiple overlapping areas of wireless access network in heterogeneous wireless network environment, or the mobile terminal may be unable to connect to the base station due to geographical location or fading. The network selection strategy and cooperative relay technology in heterogeneous wireless networks are studied in detail, which are mainly reflected in: 1, and in heterogeneous wireless network selection algorithms. Aiming at the problem that the influence of real-time state of mobile terminal on the parameters of utility function is not taken into account when standardizing the index data of utility function, a parameter setting method of utility function based on fuzzy inference system is proposed. Through the simulation and analysis, considering the influence of residual electricity on the utility of power consumption, the end user can use the terminal power more reasonably under different residual electricity. Considering the effect of terminal moving speed on the distance the terminal needs to move away from the network, it can reduce the switching times of mobile terminal and improve the performance of the system. In the process of selecting heterogeneous wireless network, In order to solve the problem of using compensatory multi-attribute decision method to access pseudo-optimal network (overall performance is optimal, individual index performance is the worst), this paper analyzes the reasons why SAW-TOPSIS-GRAMEW can access pseudo-optimal network. A wireless network selection algorithm based on MEW and combined weights is proposed. This algorithm can avoid mobile terminal access to pseudo-optimal network, and its performance in balancing network load and reducing ping-pong effect is better than that of other three methods. With the objective of minimizing the total power of the system, the joint optimization of relay location and power allocation for unidirectional multi-relay transmission systems is studied. In the case of no optimal solution, the expression of the joint optimal sub-optimal solution of relay location and power allocation in the case of two relays is derived. Then, the problem of relay location and power allocation for unidirectional NN1) relay transmission is analyzed, and the solution is extended to the case of one-way NN1) relay. The simulation results verify the feasibility of the scheme. Based on the principle of bidirectional cooperative relay transmission based on analog network coding, the expression of joint optimization of relay location and power allocation is derived. The solution is extended to the case of bidirectional NN1) relay, including even number and odd number of relays. The simulation results verify the feasibility of the scheme.
【学位授予单位】：苏州大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN92

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