Optimized Fast-handoff Scheme for Application Layer Mobility Management Authors: Ashutosh Dutta, Sunil Madhani, Wai Chen Telcordia Technologies Henning Schulzrinne Columbia University Onur Altintas Toyota InfoTechnology Center [First author is also a student at Columbia University]
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Optimized Fast-handoff Scheme for Application Layer Mobility
[First author is also a student at Columbia University]
Outline• Motivation• Intra-domain Mobility Management• SIP based Mobility Management
– SIP and Mobile IP– Fast-handoff for SIP Mobility
• Test-bed Realization• Experimental results
Media Transport
App
lica
tion
Dae
mon
Ker
nel
Phy
sica
lN
etw
ork
H.323 SIP RTSP RSVP RTCPRTP
TCP UDP
IPv4, IPv6, IP Multicast
PPP AAL3/4 AAL5 PPP
SONET ATM Ethernet CDMA 1XRTT/GPRS
Signaling media encap(H.261. MPEG)
ICMP IGMP
SAP
802.11b
DNSLDAP
MIP MIP-LR
CIP
SDP
MIPv6
MGCP
IDMP
IETF Multimedia Protocol Stack
DHCPP
Heterogeneous Access
Motivation• Objective: Design and evaluate optimized techniques
based on Application Layer Mobility Management Scheme– Several Network Layer Scheme provide optimized handoff
techniques for Intra-domain mobility– Application Layer Mobility Management Scheme rules out the
need for networking components such as Home Agent/Foreign Agent
– SIP based mobility is an application layer scheme supporting Real-Time traffic for Mobile Wireless Internet
– It is essential to reduce transient real-time traffic during frequent handoffs
Network Layer fast-handoff approaches
• Intra-domain Mobility Management Protocol– Use of Mobility Agent to limit the Intra-domain
updates to within a domain
• Hierarchical Mobile IPv4/v6 Fast Hand-offs
• Foreign Agent Assisted Handoffs
• Intra-domain Mobility with buffering Agents
SIP Background• SIP allows two or more participants to establish a session
including multiple media streams– audio, video, distributed games, shared applications, white
boards, or any other Internet-based communication mechanism• Standardized by the IETF RFC 2543• Is being implemented by several vendors, primarily for Internet
telephony– e.g. Microsoft XP operating system includes SIP as part of its
built-in protocol stack • Recently being extended to provide presence, instant messaging
and event notification• Endpoints addressed by SIP URLs