一般有限缓冲区约束下的移动自组网性能建模
On Performance Modeling for MANETs under General Limited Buffer Constraint
摘要：
了解移动自组织网络在实际网络约束条件下的实际可达性能对于其在未来高度异构无线网络环境中的应用具有重要意义。本文探讨，为第一次，性能建模的一般有限的缓冲区约束下，每个网络节点保持一个有限的源缓冲区大小$B_s$存储本地生成的数据包，也是一个有限的共享中继缓冲区大小$B_r$存储中继数据包的其他节点。本文首先基于随机理论和生灭链理论，建立了一个完整的理论框架来描述这种移动自组网中的源/中继缓冲区占用过程，该框架适用于任何分布式MAC协议和任何导致节点位置均匀分布的移动模型。在这个框架的帮助下，我们得到了几个关键的网络性能指标，包括可实现的吞吐量，吞吐量容量，和预期的端到端延迟的精确表达式。我们进一步在两个网络场景下进行案例研究，并提供相应的理论/仿真结果，以证明我们的理论框架的应用程序以及效率。最后，我们提出了广泛的数值结果来说明缓冲区限制的性能的影响，缓冲区有限的移动自组网。
英文摘要：
Understanding the real achievable performance of mobile ad hoc networks (MANETs) under practical network constraints is of great importance for their applications in future highly heterogeneous wireless network environments. This paper explores, for the first time, the performance modeling for MANETs under a general limited buffer constraint, where each network node maintains a limited source buffer of size $B_s$ to store its locally generated packets and also a limited shared relay buffer of size $B_r$ to store relay packets for other nodes. Based on the Queuing theory and birth-death chain theory, we first develop a general theoretical framework to fully depict the source/relay buffer occupancy process in such a MANET, which applies to any distributed MAC protocol and any mobility model that leads to the uniform distribution of nodes' locations in steady state. With the help of this framework, we then derive the exact expressions of several key network performance metrics, including achievable throughput, throughput capacity, and expected end-to-end delay. We further conduct case studies under two network scenarios and provide the corresponding theoretical/simulation results to demonstrate the application as well as the efficiency of our theoretical framework. Finally, we present extensive numerical results to illustrate the impacts of buffer constraint on the performance of a buffer-limited MANET.
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