Abstract: To dynamically adjust the bandwidth price according to the change of channel quality so as to change the users' profit, an improved spectrum sharing model considering user's mobility was proposed．The improved model comprehensively considers the impact on the price of the offered bands by all secondary users' bandwidth requirement and channel quality; at the same time, the requested bandwidth gets constrained by price, and thus users' profit change with position. The simulation results indicate that users can gain maximum profit by choosing a optimal position in the moving process.

Key words: bandwidth price, spectrum sharing, channel quality, profit, Cognitive Radio Network (CRN)

摘要： 为了使用户可以根据信道质量的变化动态调整带宽价格，从而改变用户收益，提出考虑用户移动性的频谱共享模型。该模型中信道质量随着用户的位置变化，主用户提出的带宽价格综合考虑所有次用户请求的带宽和信道质量的影响；同时，请求的带宽又受到带宽价格的制约，从而用户收益也随着用户位置而变化。仿真结果表明，在用户运动过程中，可以选择最佳位置使用户收益最大。

关键词: 带宽价格, 频谱共享, 信道质量, 收益, 认知无线网络