Digital Video Multi-casting System with Seamless Handover Mechanism
| Autor: | Hsin-Hao Tseng, 曾信豪 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 Since the European Telecommunications Standards Institute (ETSI) developed the DVB-H standard, digital TV is entering the field of handheld applications. But the existing handheld devices, such as personal digital assistants (PDA) or smart phones require additional equipment to use. Relatively speaking, most PDAs have built-in WLAN (IEEE 802.11b). If we can convert DVB-H services after receiving, then broadcasting over the WLAN environment. We can provide digital TV services in building such as the museum or indoor. When the handheld device moving in the indoor environment, we may need to handover which cause transmitted data loss. Thereby affecting the quality of multimedia services, in order to maintain good service quality. This thesis presents a digital video multi-casting system with seamless handover mechanism to solving this problem. The purpose of this thesis is to design for WLAN enviroment with multicast transmission. Use the characteristics of multicast, need only send one can let a few handheld devices receive. With timeslicing mechanisms, use the Off-time to detect network environment to perform soft handover. The handover period will not cause loss of information for seamless handover. To further prove the seamless handover mechanism feasibility. We use Microsoft .NET framework 2 environment with Visual C # development language. We have done a timeslicing streaming server and soft handover streaming receiver. Using PDA for handheld devices, as a test environment to achieve digital video multicast system with seamless handover mechanism. By the experimental results, the packet loss rate is 0.589% when handover during playing. In contrast to the packet loss rate of 0.436% when fixed PDA in RSSI -40 dB environment. There was no obvious increase so can prove that use of this method to achieve seamless handover feasibility. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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