Research on Spatial Image Streaming Model Based on BitTorrent
Shurong Lou · Acta Geodaetica et Cartographica Sinica · 2013
The limitations of the traditional BitTorrent protocol in providing spatial image streaming services are identified.The mechanism which support spatial image streaming in BitTorrent is described.A spatial image streaming model based on BitTorrent is also proposed.The model makes use of tracker in locating resources.Further,dynamic image tiles downloading queue which optimize image transmission is adopted in our model.Considering that the piece selection algorithms of the traditional BitTorrent protocol have many limitations in supporting image streaming,our approach gives image tiles different priorities firstly before they're requested.Then a parameter K to strike the balance between high priority tiles and low priority image tiles is used.Experimental results show that the model has the best performance when parameter K equals to 0.8 and maintains stable in the scenario of flash crowd.Also,the model gets improvement in controlling the workload balance of the network.