In future mobile systems, various access networks will be used and the usability of a mobile node (MN) with the access networks will be higher. When a MN is connected to several access networks simultaneously, it may hand over from one access network to the other according to the connectivity to the access network. In order to keep communications even during handover, the mobility of MNs and the continuous communications have to be supported. In addition, IP mobility has to be supported as well. With the increase usage and mobility of MNs, it is highly required to control the traffic incurred by the communication of MNs. In the prospects of Network Service Provider (NSP) or Internet Service Provider (ISP), the overall aspect of traffic would be more dynamic due to the mobility of MNs. It is also more likely for the traffic to be concentrated. Therefore, it is necessary for Service Provider (SP) to have how to control the communication service provided to each MN in order to provide smooth communication. In this paper, we propose a method to support the continuous communications in Proxy Mobile IPv6 (PMIPv6) that provides IP mobility. In case that a MN is connected to a PMIPv6 domain through multiple interfaces, this method makes it possible to keep all the communications as long as some connecting interfaces remain supported when other interfaces are disconnected because of some problems such as the movement of the MN. And we propose a method for the SP to control the communication provided to MN. This paper suggests a new signalling procedure to provide more stable continuous communications and to control the communications efficiently. The new MN protocol stack model is designed to maximize the use of MN as well.