Abstract:

In traditional wireless networks, there is a lot of waste of channel resources in fixed channel allocation, but the utilization rate of spectrum resources in static spectrum allocation mode is extremely unbalanced in time and space. In this paper, a spectrum allocation strategy based on two types of cognitive users and channel aggregation mechanism is proposed, and a multi-priority discrete-time queuing model with variable service rate is established, the three-dimensional Markov chain is constructed. The effectiveness of spectrum allocation strategy in stabilizing system performance and saving network resources is demonstrated by numerical experiments using performance index.

Key words: cognitive wireless network, multilevel cognitive users, channel aggregation, three-dimensional Markov chain

摘要：

针对传统无线网络中固定信道分配中信道资源存在大量浪费，而静态频谱分配模式中频谱资源在时空上的利用率极不平衡的问题，研究认知无线网络，提出一种基于两类认知用户及信道聚合机制的频谱分配策略，建立一个具有可变服务率的多优先级离散时间排队模型，构造三维马尔可夫链。利用性能指标进行数值实验，论证了频谱分配策略在稳定系统性能和节省网络资源方面的有效性。

关键词: 认知无线网络, 多级认知用户, 信道聚合, 三维马尔可夫链