Abstract: With the development of social science, the traditional network services model has been replaced by a new model called for pervasive computing model. And then the coexistence of a variety of terminal equipments network situanon comes up. When the task is in the migration of network services,the generation of congestion is inevitable. The result is that congestion has a direct impact on the transmission performance of networks. For the problems of the current traditional algorithm,for example congestion problems,a new congestion control algorithm DARed was designed. that the algorithm in ubiquitous computing environment has shown excellent performance is shown by NS2 simulation experimenu. It can be effective for avoiding for network congestion, and meet the universal service requirements.

Key words: Ubictuitous computing, Congestion control, Red, NS2