Abstract: In the conventional network using the PPP stipulated by RFC1661, the LCP phase to establish an LCP link, the authentication phase, and the NCP phase such as address assignment processing of the NCP are sequentially conducted each time the line connection is performed, and hence the connection takes a certain period of time. Particular, in the case of the mobile communication, there is often performed operation in which connection and disconnection are frequently conducted in a short period of time, and hence when the operation up to the connection takes a long period of time, the usability is deteriorated. Therefore, a need exists for a configuration of an apparatus and a communication method to reduce the connection time.

Abstract: A communication system using PPP in which a plurality of layer 3 protocols are defined has a problem. PDSN cannot judge which of layer 3 protocols is equipped in a terminal, and NCP phase processes corresponding to all layer 3 protocols of the system are executed. This increases the number of PPP packets transmitted/received between the terminal and PDSN, which prolongs a connection time. In the invention, a new procedure of the NCP phase process is established in a communication system, by which the terminal firstly notifies a layer 3 protocol to PDSN and thereafter the NCP phase process is executed. PDSN waits for a notice of the layer 3 protocol from the terminal, selects the corresponding layer 3 protocol from the layer 3 protocols according to the notice, and executes the NCP phase.

Abstract: In the conventional network using the PPP stipulated by RFC1661, the LCP phase to establish an LCP link, the authentication phase, and the NCP phase such as address assignment processing of the NCP are sequentially conducted each time the line connection is performed, and hence the connection takes a certain period of time. Particular, in the case of the mobile communication, there is often performed operation in which connection and disconnection are frequently conducted in a short period of time, and hence when the operation up to the connection takes a long period of time, the usability is deteriorated. Therefore, a need exists for a configuration of an apparatus and a communication method to reduce the connection time.

Abstract: A communication system using PPP in which a plurality of layer 3 protocols are defined has a problem. PDSN cannot judge which of layer 3 protocols is equipped in a terminal, and NCP phase processes corresponding to all layer 3 protocols of the system are executed. This increases the number of PPP packets transmitted/received between the terminal and PDSN, which prolongs a connection time. In the invention, a new procedure of the NCP phase process is established in a communication system, by which the terminal firstly notifies a layer 3 protocol to PDSN and thereafter the NCP phase process is executed. PDSN waits for a notice of the layer 3 protocol from the terminal, selects the corresponding layer 3 protocol from the layer 3 protocols according to the notice, and executes the NCP phase.