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

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