Method of providing circuit switched(cs) service using high-speed downlink packet access(hsdpa) or high-speed uplink packet access(hsupa)

A method for providing a circuit service by using a packet network in order to transmit data generated in a CS service from a radio protocol supporting only packet switched network or a PS service is provided to support a CS(Circuit Switched) service in HSPA(High Speed Downlink Packet Access And High Speed Uplink Packet Access) network. One or more SDU(Service Data Unit) is received from a high layer. A header is added to one or more received service data unit for a PDU(Protocol Data Unit) configuration. The header comprises the time information. The comprised protocol data unit is delivered to the lower layer.