The congestion control problem in communication networks has been abstracted as an aggregate utility maximization problem in price-based congestion control model.Price-based model has become the general framework to design and analyze congestion control mechanisms.However, a pricebased model is different from real network environments since it is a simplified linear model.In recent years, research efforts are made to extend and improve the price-based model.In order to systemicaly understand the development of this research area, we first briefly review the concept of price-based model, and analyzes its limitation, then summarizes the research efforts.Finally, we provide some further interesting research directions.%基于价格的拥塞控制模型将网络拥塞控制问题抽象为聚合效用最大化的优化问题,已经成为拥塞控制机制设计和分析的一般框架.然而简化的线性模型与现实网络环境有一定差距,不能准确有效地指导新协议的设计与分析.因此,近年来研究人员正试图结合新的技术和应用,扩展完善基于价格的模型,建立更为准确有效的模型来反映现实的网络环境.为了系统地了解该领域研究工作的进展,本文首先简要回顾了基于价格的模型,分析其不足,介绍近年来在模型扩展方面的研究工作,最后指出几个有意义的研究方向.
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