mobile communication develop very fast. How to guarantee QoS of each customer. How to provide different QoS for different service is getting more and more concern. This paper introduce QoS of 2.5G and 3G
discuss the fault of GPRS networks and provide the solution.Especially
this paper point out: In the process of dealing with QoS
SGSN is the key element. To provide high quality
SGSN must have the compatibility of different QoS .