Abstract
In this paper the technology of VoZP and mobile computing are tried to integrate together. so that a mobile Internet telephony system (MVoZP) can be built on an integrated roaming environment of different networks. In order to support the mobility of system, the handset of the MVoZP system should have multiple adapters, which have different coverage range of communication area. The adapters should be given the ability to be used in complementary. The adapters used in this paper are that of Ethernet, wireless local area network, and cellular phone network. The inherited problem of VoZP is not addressed, but the new problem of MvoZP is emphasized. As our study, the new problems are (I) how to use the adapters in complementary way, so that the mobile area can be as large as possible and (2) how to reduce the time delay of handoff so that the voice transmission can be smoothly. The solutions to solve these two problems are described in detail.