 
                                                                                | Article ID: | iaor20082027 | 
| Country: | China | 
| Volume: | 37 | 
| Issue: | 4 | 
| Start Page Number: | 15 | 
| End Page Number: | 19 | 
| Publication Date: | Dec 2005 | 
| Journal: | Journal of Northeast Normal University | 
| Authors: | Zhao Li, Song Lixin | 
| Keywords: | queueing networks | 
In this paper, the diffusion approximation for a three-stations re-entrant networks under priority service discipline were studied. Based on weak stability, turn the queue length into a certain format using stochastic analysis theorem. We a derive necessary and sufficient conditions for the existence of the diffusion approximation for the queue networks when the traffic density is one for each station.