Internet Telephony in Ubiquitous Computing Environments

摘要

Nowadays VoIP plays an important role in communication, and more and more peopleuse VoIP instead of traditional telephones because of low cost, accessibility andimproved quality. However, one of disadvantages of VoIP is that users have to receivethe Internet calls by headset and microphone, which are attached to a PC. This wayrestricts the users’ mobility and doesn’t meet the need of modern users. An innovativeimprovement would be to use some existing wireless technology to impart mobility toVoIP calls. We propose to use Bluetooth due to its widespread availability in alreadyubiquitous mobile phone market.Bluetooth is a short-range communication protocol intended to replace the cablesconnecting portable and /or fixed electronic devices. Bluetooth is one of the mostwidespread wireless technologies available in most mobile phones available in themarket today because of its low power consumption, low cost and robustness. Thisproject aims at using Bluetooth enabled mobile phones as wireless headsets for PCsthat run Internet telephony software in order to induce mobility. The project focuseson investigation and analysis of Bluetooth and related technology for building such asolution, such as service discovery, redirection, security and fast handover. From theresearch done, this thesis proposes mechanisms and design for a prototype that allowsthe connection between PCs and Bluetooth enabled mobile phones. The project alsoreviews different available alternatives and compares existing solutions.We believe that since Bluetooth and VoIP become more and more mature, our projectwill be applied in people’s daily life soon. And this ideas proposed in this projectwould be a convenient and useful extension to already existing Bluetooth serveravailable on most mobile phones, providing that extra bit of mobility around aworkstation or PC.