| Summary: | 碩士 === 靜宜大學 === 資訊管理學系研究所 === 92 === Recent years have seen a tremendous amount of effort toward the development of Internet infrastructure and multimedia technology. Instant messaging communication is more and more popular. Session Initiation Protocol (SIP) is an application-layer control protocol that can establish real-time communications and support terminal, session, personal, and service mobility. If the User B moves during a session, it needs to register its new IP address with Registrar and send a re-INVITE to the communicating party User A. After receiving the re-INVITE message, User A transmit the subsequent packets to User B’s new location. User B can’t receive packets until they complete the handoff. Therefore, data in transit may be lost. In order to reduce the data loss, we use a general idea of REFER method to achieve smooth handoff that Old Proxy can buffer packets and redirect them to the current location of the User B. Simulation results indicate that the proposed smooth handoff is better than base SIP handoff.
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