1. 後卓越計畫 進度報告 楊舜仁老師實驗室 2006.05.01

2. 2 Outline  Introduction  SIP based mobile QoS model  MH registers the SIP based service  MH initiates the SIP based service  MH moves from one cell to another

3. 3 Introduction  If Differentiated Services is used in conjunction with Mobile IP in the mobile environment  Triangle routing problem  We proposed SIP based mobile QoS model that used the multicast technology to manage handoff of the mobile host  QoS SIP architecture for fixed networks

4. 4 SIP based mobile QoS model QoS-SIP proxy server the functions of SIP proxy server resource reservation Edge router The routers are placed at the boundary between the access networks and the DiffServ core network Bandwidth broker A logically centralized entity in charge of managing resources of whole Diffserv network It acts as an Admission Control Server

5. 5 Sender Q-SIP Mobile proxy MH Merge point (2) IGMP (1)SessionSpec (new sip message) (2) IGMP Q-SIP Mobile proxy Bandwidth broker Edge router (1)SessionSpec (new sip message) (2) IGMP (1)Registration (modified sip message) (3) reconfigure MH registers the SIP based service A B C

6. 6 Sender Q-SIP Mobile proxy MH Conventional Reservation for MH Predictive Reservation for MH Merge point (2)200 OK (modified sip message) Q-SIP Mobile proxy Bandwidth broker Edge router (2)200 OK (modified sip message) (2)200 OK (modified sip message) (3)COPS (predictive reservation) (3)COPS (predictive reservation) (3)COPS (conventional reservation) (1)Pre-invite (new sip message) (1)Pre-invite (new sip message) (1)Invite (modified sip message) MH initiates the SIP based service A B C

7. 7 Sender Q-SIP Mobile proxy MH Conventional Reservation for MH Predictive Reservation for MH Merge point (1) (2) Invite (modified sip message) Q-SIP Mobile proxy Bandwidth broker Edge router (2) TearDown (new sip message) (3)COPS & leave Multicast group (release resource) (3)COPS (switchflow) MH (4)200 OK (modified sip message) (5)COPS (switchflow) A B C MH moves from cell B to cell C