This a simulator written in Tcl to simulate a network node carrying GSM and GPRS traffics with QoS mechanisms. The payload type including circuit-switched voice, VoIP and web traffic, and the performance including packet drop, delay can be analyzed.

This paper discusses on quality of service (QoS) guarantee in P2P network, and proposes a simple QoS architecture. In section 1, main characteristic of P2P network and the importance of Qos in P2P network are viewed. In section 2, QoS requirement