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Title page for etd-0829105-095926


URN etd-0829105-095926 Statistics This thesis had been viewed 2156 times. Download 5 times.
Author Bo-Fu Shen
Author's Email Address galaxy.shen@gmail.com
Department Computer Science and Enginerring
Year 2004 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 37
Title Implementation on VoIP based on SIP for GPRS/WLAN Integration
Keyword
  • WLAN
  • VoIP
  • SIP
  • Seamless
  • Handoff
  • GPRS
  • GPRS
  • Handoff
  • Seamless
  • SIP
  • VoIP
  • WLAN
  • Abstract In this paper, we propose a SIP based architecture that supports roaming for WLAN and GPRS seamless network from the perspective of VoIP services and describes in handoff procedures for WLAN-to-WLAN and WLAN-to-GPRS. This architecture combines layer 3 and 4 for handoff process, in order to decrease packet loss and the end-to-end delay, jitter is kept under control. In Layer 3, Received Signal Strength (RRS) used for handoff detection and Session Initial Protocol (SIP) supports terminal mobility in Layer 4. Therefore, we measure the total handoff time. We used Session Controller and RTP Proxy as media gateway in handoff process. The goal is reducing the handoff latency and packet loss to an acceptable level for media streaming. In our performance study we focus on optimizing the handoff process time and RTP packet number. In SIP mid-call handoff, our propose scheme ignored process of SIP handoff detection and decrease the time of total handoff process. Moreover, Session Controller and RTP Proxy supported the RTP packets buffer for handoff delay time. We have measured the handoff delay with SIP terminal.
    Advisor Committee
  • Chia-Sheng Tsai - advisor
  • Chuen-Yau Chen - co-chair
  • Yo-Ping Huang - co-chair
  • Files indicate not accessible
    Date of Defense 2005-07-26 Date of Submission 2005-08-29


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