QoS Model of Multimedia Integrated Services Digital Network in Coal Mine
Wu Jian · Journal of China University of Mining and Technology · 2010
To improve the quality of service (QoS) of the multimedia integrated services digital network (ISDN) of the coalmine enterprises,the hierarchical structure of QoS network and the model of the gateway node were proposed based on the characters of the coalmine network.Using approach of the DiffServ,the services of the coalmine network were classified and marked by per hop behavior (PHB),and the discard and schedule algorithm of queue packet were proposed to differentiate the services.The results show that the scheduled bandwidth can be obtained by the services closely related to the coalmine safety production,even facing multi-kind services and huge data amount.The average packet delay was steadily kept at 40.4-41.2 ms,the delay jitter was less than 0.46 ms,and the packet loss rate was zero.The remaining bandwidth can be obtained by scavenger services.The average packet delay differed from 42 ms to 56 ms,the delay jitter varied at 1.7-3.6 ms,and the packet loss rate reached 47.6%.