Design and Implementation of SCTP-Based Seamless Multimedia Communications

• Main Authors: Ren-yang Fang, 方仁揚
• Other Authors: 楊中平
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/72054449556458918749

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 97 === In recent years, networks are composed by complex subnets. When a mobile device moves for a subnet to another, the network interface of the device must switch from original network IP address to the new one. The procedure is named “Handover”. If TCP or UDP protocol is applied, the application program can choose only one network interface when the PC has multi-network interface. When the default network interface failed in the handover situation, the application program can’t change to the available one. Therefore, there is a new protocol, Mobile IP, used to solve the handover issue. However, the existing infrastructures have to be updated to support the Mobile IP. In order to improve the performance on multi-network interface environment, the IETF (Internet Engineering Task Force) standardized the new transport protocol Stream Control Transmission Protocol (SCTP). There are some good features of SCTP, “multi-homing”, “multi-streaming” and “PR-SCTP”. The feature of multi-homing allows an SCTP node has multiple IP addresses. We apply one of the SCTP extensions: dynamic IP address reconfiguration to handler the handover problems. It can provide a graceful method to add/delete/change to the interface of an existing association when the node moves from subnet to another. By using SCTP features, multi-homing, multi-streaming and PR-SCTP, we design and implement a video/audio SCTP-Based Seamless multimedia application on Linux operating system. We also propose a mechanism, which changes the stream number, to avoid blocking during handover procedure.