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This paper discusses MSA; a _Mobility support -Architecture for IP nodes o n a wireless telecommunication network. MSA has the capability of performing IP node location management, address resolution from an IP address t o an identification number of a node on a wireless telecommunication network, and virtual circuit control across IP subnetworks. MSA avoids redundant mobility management, and provides efficient routing to IP nodes on a wireless telecommunication network. In order t o accomplish the optimal route between IP nodes, MSA cooperates with the route optimization mechanism of IETF Mobile IP. As a result, MSA realizes an IP node on a wireless telecommunication network, which communicates optimally with other IP nodes on a wireless telecommunication network and other networks without any extensions except for a wireless telecommunication network interface module. We implemented a prototype system based on a kind of PCS. This paper concludes that MSA proposes a new mobile 1P mechanism suitable for IP nodes on wireless telecommunication network environments and proves its efficiency through measurement and consideration. I . INTRODUCTIONDigital wireless telecommunication systems have been emerging recently. Personal Communication Services (PCS) have been developed as one of them. They allow people to communicate everywhere in the world and provide them with multimedia services. Internet, on the other hand, is the largest world-wide communication platform, especially for computer communication. In order to combine the features of Internet and digital wireless systems, we have been carrying out research on a mobile terminal which not only has global wireless telecommunication connectivity but also I P reachability. In this combina.tion, we consider PCS as a n alternative network interface in place of Ethernet.PCS supports mobility of terminals. However, if a. Mobile Node (MN) employing the lnternet Protocol (IP) tries to roam over a PCS platform, the IP routing mechanism will be invoked prior to a mobility management mechanism included in PCS; as a result, all related communications to the MN will fail in the case that the MN is out of the IP subnetwork which MN's IP address belongs to. On the other hand, if the MN employs Mobile IP [6], Mobile IP routing mechanism will try to forward IP packets to the MN's care-of address. Then, the PCS platform will establish a connection to the MN by invoking its own mobility management mechanism. As we can see, the redundant mobility support from the. Mobile IP and PCS is a waste of resource. It depends on a care-of address assignment of the MN whether redundant forwarding occurs or not.We have explored an architecture which enables mobile IP nodes on PCS t o communicate with each other in a way that the communication routes are optimal. In this paper, we describe the architecture MSA; a _Mobzlzty Support Archztecture for IP nodes on a wzreless telecommunicatzon network. MSA has the capability of performing IP node location management, address resolution from an IP addr...