| Summary: | 碩士 === 國立交通大學 === 資訊工程系所 === 93 === With the rapid growth of wireless networks, many related topics have been proposed and discussed. Currently, the combination of Fast Handover and Hierarchical Mobile IP can reduce the problems of mobile devices roaming between subnets such as packet loss rate and handover time.
During the handover period, a mobile device needs to perform fast handover signaling as well as authentication mechanisms. The total handover latency and packet loss rate of mobile device will increase according to the complexity of the authentication mechanism. This negative impact causes mobile devices unable to transmit its real-time data packets quickly, hence the quality of service will be affected.
Several proposed authentication methods such as AAA (Accounting, Authentication, Authorization) and IEEE 802.1x and etc have been proposed. The complexity of each method has different features and influence.
We propose a two-stage authentication scheme in this thesis for achieving low-latency handoff. It allows mobile devices to send certain authentication information by fast handover protocol to obtain a temporary pass certificate from new access node before roaming to the new domain. Mobile device can use the temporary pass certificate to receive real-time data packet quickly and then perform re authentication process to complete the total authentication as normal procedure. We evaluate the performance of the proposed method by using ns-2 simulator and it is shown that transient authentication scheme really improve the quality of service during handover process.
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