一种无线通信系统中调度碎片避免机制研究

Study on Scheduling Debris Avoiding Mechanism in Wireless Communication System

在通信系统中,为了保障传输的可靠性而引入了ARQ机制。这种机制带来数据传输的高度可靠及灵活的同时,也导致了内存管理的复杂。分析了ARQ机制、分组调度机制之间的关系,并对两种机制相互作用下产生的包碎片现象展开研究分析,建立了调度碎片生灭及尺寸的数学模型;为减少调度碎片的产生,设计了基于资源预测的二次指数平滑法的碎片避免机制。为验证碎片生灭模型及避免机制,设计了基于LTE系统的仿真场景,仿真结果表明,碎片生灭及大小符合数学模型,且调度碎片避免机制与传统的调度机制相比,能够有效减少碎片的生成以及提升存储管理的性能。

In order to achieve high transfer reliability, a mechanism called automatic repeat quest （ARQ） was applied in wireless communication system. The mechanism brings the complexity of storage management in the sender even though it can make the data transforming more reliability and flexible. The scheduling debris was thorough analyzed based on the research on the relationship between ARQ mechanism, and packets scheduling. The birth-death and size model was built for scheduling debris. In addition, a scheduling debris avoiding mechanism was designed using the information of resource prediction to reduce the number of scheduling debris. A simulation scenes based on LTE （Long Term Evolution） was designed to evaluate the mathematics model and scheduling avoiding mechanism. The simulations results show that the model can well describe the scheduling debris and the scheduling debris avoiding mechanism can efficient reduce the packet generating.