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异构无线网络中的选择策略研究

发布时间:2018-01-09 00:04

  本文关键词:异构无线网络中的选择策略研究 出处:《西安电子科技大学》2014年博士论文 论文类型:学位论文


  更多相关文章: 异构无线网络 网络选择策略 有效容量 时延限制 功率控制 资源预测 小区间干扰


【摘要】:随着移动通信技术的不断发展,适应不同场景的异构无线网络可以为用户提供高质量的服务,满足用户宽带接入和无缝移动性的需求,移动终端如何选择合适的网络进行接入,成为异构无线网络需要解决的主要问题。在移动通信系统中,影响用户服务质量和网络性能的因素主要包括小区覆盖范围、接收信号强度、时延、带宽、信噪比等,本文对异构无线网络选择策略进行较为深入的研究,为用户提供满足其不同需求的网络,具体内容如下: 1.针对异构无线网络中带宽资源受限的问题,提出了一种基于带宽资源分配的网络选择策略,以带宽受限情况下最大化整体网络的信息传输速率和带宽利用率为目标,将用户的信息传输速率作为目标函数,带宽资源限制作为约束条件,得到最佳的带宽分配策略,将用户分配到最合适的网络中。理论分析和仿真实验表明基于带宽资源分配的网络选择策略可以获得较高的网络吞吐量和资源利用率。 2.将网络时延限制和瞬时传输速率相结合,提出了基于有效容量的网络选择策略。在实际系统中,不同的业务具有不同的时延要求,但是传统的香农容量定理并没有考虑网络和业务的时延特性,因此本文利用有效容量的概念,通过功率控制准则,将网络时延特性引入到传输速率中,以基于有效容量和时延特性的传输速率作为目标函数,以功率控制准则作为约束条件,采用凸优化理论得到最大化的信息传输速率。然后构建一个效用函数,综合考虑瞬时信道传输速率和用户开销对用户性能的影响。最后用户通过比较接入不同网络的效用函数,选择具有最高效用函数的网络进行接入。理论分析和仿真实验表明基于有效容量的网络选择策略可以在保证用户服务质量的前提下提高网络的吞吐量。 3.将网络因素和基于有效容量的瞬时信道传输速率相结合,提出了联合的网络选择策略。我们将联合网络选择策略分为两种情况分别讨论。 在第一种情况中,针对异构无线网络不同业务的时延限制和网络资源不确定性的问题,提出了一种联合时延限制和资源预测的网络选择策略。首先预测下一时隙信道资源的空闲概率和占用概率,然后以基于有效容量的信息传输速率作为目标函数,,以用户的功率控制作为约束条件,在保障用户服务质量的前提下,采用凸优化理论得到最大化的网络传输速率,最后用户根据预测结果和传输速率两方面因素,选择具有充足带宽资源和最大传输速率的网络进行接入。仿真实验表明,在不同信道衰落条件下,联合时延限制和资源预测的网络选择策略与注水策略相比,传输速率高于注水策略,并且更接近已知网络资源空闲情况的速率上界。 在第二种情况中,针对异构无线网络不同业务的时延限制和小区间干扰的问题,提出了一种基于小区间干扰和时延特性的网络选择策略。首先通过功率控制准则,得出基于网络时延限制和接收信号强度限制的用户传输功率和接收到的干扰功率,计算用户接入网络的信号和干扰加噪声比(SINR)。然后通过比较接入不同网络的SINR,选择具有最高SINR的网络进行接入。理论分析和仿真实验表明,随着网络时延限制条件的变化,本文提出的基于小区间干扰的联合网络选择策略可以获得较高的网络吞吐量和用户平均SINR。 4.针对异构无线网络中用户具有自私性的问题,提出了一种基于拍卖理论的网络选择策略。首先采用单目标第二价格拍卖理论分析切换式网络选择策略,在切换式网络选择策略中,用户同一时间只能接入一个网络,用户根据质量函数和干扰质量函数对网络资源进行出价,网络将资源分配给出价最高的用户,因此可以保证较高的网络吞吐量。其次采用多目标扩展Vickrey拍卖理论分析并行式网络选择策略,在并行式网络选择策略中,用户可以同时接入多个网络,赢得多个网络资源的用户可以接入多个网络进行服务,从而提升了网络性能。理论分析和仿真实验表明,与其他网络选择策略相比,基于拍卖的网络选择策略不仅可以提升网络吞吐量,而且可以降低网络的中断概率。
[Abstract]:With the development of mobile communication technology , the heterogeneous wireless network adapted to different scenarios can provide high - quality service for users , meet the needs of user ' s broadband access and seamless mobility , how to select the appropriate network for access by the mobile terminal , and become the main problem that the heterogeneous wireless network needs to solve . In the mobile communication system , the factors that affect the quality of service and network performance of the user include cell coverage , received signal strength , time delay , bandwidth , signal - to - noise ratio , etc . In the mobile communication system , the network with different requirements is provided for the user , and the specific contents are as follows : 1 . Aiming at the problem of bandwidth resource limitation in heterogeneous wireless networks , a network selection strategy based on bandwidth resource allocation is proposed , the information transmission rate and bandwidth utilization rate of the whole network are maximized under the condition of bandwidth limitation , the information transmission rate of the user is used as the target function , the bandwidth resource limitation is used as the constraint condition , the optimal bandwidth allocation strategy is obtained , and the user is allocated to the most appropriate network . 2 . Combining the network delay and the instantaneous transmission rate , a network selection strategy based on the effective capacity is proposed . In the practical system , different traffic has different time delay requirements , but the traditional Shannon capacity theorem is introduced into the transmission rate based on the effective capacity and the time delay characteristic . Then , a utility function is constructed , and the network with the highest utility function is selected by comparing the utility function of the different networks . The theoretical analysis and simulation experiments show that the network selection policy based on the effective capacity can improve the network throughput under the premise of ensuring the service quality of the user . 3 . Combining the network factors and the instantaneous channel transmission rate based on the effective capacity , a joint network selection strategy is proposed . In the first case , a network selection strategy for joint time delay restriction and resource prediction is proposed for the problem of time delay limitation and network resource uncertainty for different traffic in heterogeneous wireless networks . Firstly , the idle probability and occupancy probability of the next time slot channel resources are predicted , and then the network with sufficient bandwidth resources and maximum transmission rate is selected as the target function by using the information transmission rate based on the effective capacity . In the second case , a network selection strategy based on inter - cell interference and time delay characteristics is proposed for the problem of time delay and inter - cell interference of different traffic in heterogeneous wireless networks . First , according to the power control criterion , the signal and interference plus noise ratio ( SINR ) of the user ' s access network is calculated . Then , the network with the highest SINR is selected by comparing the SINR of the different networks . Theoretical analysis and simulation experiments show that the combined network selection strategy based on inter - cell interference can obtain higher network throughput and user average SINR with the change of network delay restriction conditions . 4 . A network selection strategy based on auction theory is proposed for users in heterogeneous wireless networks . Firstly , a single target second price auction theory is used to analyze the switching network selection strategy . In a switched network selection strategy , users can access more than one network at the same time . In the parallel network selection strategy , users can access more than one network at the same time .

【学位授予单位】:西安电子科技大学
【学位级别】:博士
【学位授予年份】:2014
【分类号】:TN92

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