Mobile SCTP Transport Layer Mobility Management for the Internet
Application Layer Mobility Management Scheme for Wireless Internet
description
Transcript of Application Layer Mobility Management Scheme for Wireless Internet
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Application Layer Mobility Management Schemefor Wireless Internet
Mohamed Elkanzi
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Contents
• Introduction• 3G IP Architecture• Mobility Management• Wireless IP Hand-off• Registration• Configuration & Dynamic Address Binding• Proposed Tier• Experiments• Conclusions
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Introduction
• As the number of wireless devices connecting to the internet is increasing, more work needs to be done to standardize the all the IP wireless networks.
• IETF, 3GPP and MWIF• The focus is to merge the wireless and the
wireline networks.• MIP provides some solutions but creates
some problems too.• SIP as an alternative for MIP
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3G IP Architecture
Domain Control Agent
Domain Control Agent
Regional IP NetInternet Regional IP Net
Radio Access Network (RAN)
Radio Access Network (RAN)
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Mobility Management
• Mobility management requirements:– Availability– Global roaming– Supports real time (telephony) and non-
real-time (mobile web access) services.– Supports TCP applications– Supports multicast connections– Handles registration, configuration,
dynamic binding, and location management
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Wireless IP Hand-off
• The procedure is divided into three logical layers:– Cell hand-off– Subnet hand-off– Domain hand-off
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Registration
• Newly joining MS sends registration• The network performs:
– Accounting– Authorization– Auditing
• When a MS moves between subnets appropriate registration is carried out by intermediate servers or SIP agents.
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Configuration & Dynamic Address Binding• As MS changes networks it requests a
new IP and the network’s subnet information
• The DNS should be updated automatically• Dynamic Address Binding is for an MS to
maintain an address during its session no matter which network it belongs to.
• Location management is maintained and updated frequently
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Proposed Tier: Terminal Mobility• Multimedia traffic is categorized as
realtime and non-realtime by loss and delay factors.
• Different protocols are used to transport the categorized traffic.
• RTP/UDP is for realtime traffic• TCP is for non-realtime traffic
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Terminal Mobility for Real-Time application• For real-time applications delay and
loss are the major concern• Triangular routing and packet
encapsulation should be avoided• Hand-off must be efficient• SIP is used to support subnet and
domain handoff, while cell hand-off is taken care by the link layer
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Non-real-time Applications
• SIP signaling is used to transport TCP packets.
• Each MS has a SIP agent that maintains its TCP connections
• The agent also maintains the MS’s original and current IP addresses.
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Service & Personal Mobility
• This aspect assures that the user is able to maintain and obtain services.
• The server’s ability to control the user’s sessions and services. These properties could be transferred during hand-off and SIP registration
• SIP’s URI provides the user with the ability to make use of the services anywhere anytime.
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Test-bed
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Experiments
• Customized version of University Columbia’s SIP client sipc and SIP server sipd
• Two clients over IEEE 802.11 environment
• A lighter DHCP version was used DRCP
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Conclusions
• The proposed architecture provides an alternative for a wireless internet enabled services
• SIP provides a flexible protocol to maintain and obtain services while being mobile.