Patent ID: 7088724

Claim:
A communication system for performing a communication control comprising: a QoS setting device including a QoS information setting part that sets QoS information of IP in a packet and sets QoS information of ATM corresponding to the QoS information when an IP-based communication takes place, and that sets QoS information of ATM in a cell when an ATM-based communication takes place and an information sending part that sends the packet or the cell; and a QoS communication device including an information receiving part receiving the packet or the cell, and a QoS guaranteed communication part performing a communication control with QoS being guaranteed on the basis of the QoS information; wherein the QoS information setting part sets the QoS information of IP in a Differentiated Service (DS) field of a packet and sets the QoS information of ATM in a Currently Unused (CU) field in the DS field.