Modeling and analysis of mobile communication network with multi-goals based on present, past and future states

1.针对无线移动通信系统对寻呼成本和寻呼时延的要求，研究了几种具有聚合机制的动态多步寻呼方案。我们证明了子网或单元的均衡划分具有一些基本性质，因此，它们可以用来设计有效的寻呼方案。我们的性能分析表明，所提出的方案简单，但在寻呼开销和寻呼时延方面令人满意。为了有效地定位移动代理，我们提出了利用移动代理过去的移动行为进行位置管理。行为可以从主机迁移模式中获得，该模式随着代理用户从过去的操作中获得的意图等而变化。从移动代理的行为出发，提出的系统的概念指定了移动代理适合连接的主机。通过仿真实验证实，不仅可以利用直接位置信息的行为，还可以利用主体的行为，从最小位置信息中找出主体。通过仿真研究了考虑移动节点移动性的二维蜂窝网络的性能。我们假设移动节点按照随机路点法移动。通过切换呼叫丢失率、平均切换次数和平均小区驻留时间来衡量性能。通过仿真研究，我们得出结论：1)移动角度的变化对性能指标的影响很小；2)当改变移动节点的速度分布时，主要因素是移动节点的速度较低。

1. Several dynamic multi-step paging schemes with aggregate mechanism to meet the requirements on paging cost and paging latency of wireless mobile communication systems are investigated. We show that the balanced partitions of subnets or cells possess some essential properties, and thus, they can be employed to design efficient paging schemes. Our performance analysis demonstrates that the proposed schemes are simple but satisfactory in paging cost and paging latency.2. In order to locate Mobile Agent (MA) efficiently, we propose the location management which uses behavior of the MA's past movement. Behavior may be grasped from the host migration pattern which changes with agent's user's intention obtained from the past operation etc. From behavior of the MA, the concept of the proposed system specifies the host for which the MA is good to be connected. It is confirmed with simulation experiments that it is possible to find out an agent from the minimum location information by using behavior of not only direct location information but also the one of agents.3. Performance of two-dimensional cellular networks considering the mobility of mobile nodes is investigated through the simulation. We assume that mobile nodes move according to the random way point method. The performance is measured with loss probability of handover call, mean handover times, and mean cell dwell time. From the simulation studies, we conclude that1)the effect of change of moving angle on the performance measures is very small.2)when we change the speed distribution of the mobile nodes, the dominant factor is the low speed of mobile nodes.