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Mobility Management in IP Networks

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End-to-End TCP', ACM MobiCom, San Diego, September 2003. Two Very Simple Ideas ... Traffic. Effects of Channel Separation. on UDP Downstream Traffic. During ... – PowerPoint PPT presentation

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Title: Mobility Management in IP Networks


1
Mobility Management in IP Networks
Aruna Seneviratne, Henrik Petander and Eranga
Perera
2
IP Mobility
  • Broadly two methods
  • Re-direction
  • SIP
  • In-direction
  • MIP versions
  • In this talk we will concentrate on in-direction
    methods
  • Specifically MIPv6

3
What Problems Does Mobile IP Solve?
  • An IP address not only identifies a host but also
    a point-of-attachment
  • A host cannot change its IP address without
    terminating on-going sessions and restarting them
    after it acquires a new address.

4
MIPv6
  • Provides
  • A streamlined protocol for mobility support
  • Eg. Binding Updates
  • Large Address space
  • Enhanced QoS
  • Security (IPSec)
  • Extensions to support network mobility - NEMO

5
NEMO
  • Provides
  • Aggregation of routing and signaling
  • Easier to manage
  • Economic incentives
  • Additional radio capabilities
  • Support for technologically less sophisticated
    nodes

6
Fundamental Problems with MIP6/NEMO
  • Handoff Latency
  • Link Layer time to find new Access Point and
    associate with it
  • Network Attachment router discovery and CoA
    configuration
  • Home Registration the update of the HA
  • Essentially Independent of the access technology
    and network topology

7
Network Mobility research at NICTA
  • Handoff performance improvements.
  • Infrastructure based
  • Mobile Router based
  • Measuring the performance of the NEMO protocol.
  • Solutions to routing and protocol header
    overheads in NEMO.
  • Increasing the utilization of hot spots.

8
NICTA IPv6 Mobility Test bed
9
Abstract View of the Problem
pAR
nAR
Buffer and Forward
Multicast
Hierarchy
10
Fast Handovers
  • Fast Handovers for Mobile IPv6 (FMIPv6) uses
    buffering in the Access Routers which hides the
    handoff latency from applications
  • Can be coupled with bicasting for continuous
    delivery of packets (simultaneous bindings with
    Fast Handovers)
  • Hierarchical MIP uses a MAP which controls a
    number of access points.

11
Infrastructure based improvements
  • The use of buffering has drawbacks
  • Link saturation results in delays
  • Complex wireless resource management
  • Bicasting has a large over the air overhead and
    potentially a negative impact on TCP from packet
    duplication
  • Hierarchical systems difficult to deploy
  • Infrastructure based approaches are not always
    feasible
  • Access networks run by different operators
  • Access networks with legacy equipment

R. Heish, Z. Zhou and A. Seneviratne, S-MIP
Seamless Handoff Architecture for Mobile IP,
IEEE Infocom 03, San Francisco , March/April
2003. R. Heish and A. Seneviratne A Comparison of
Mechanisms for Improving Mobile IP Handoff
Latency for End-to-End TCP, ACM MobiCom, San
Diego, September 2003.
12
Two Very Simple Ideas
  • Have multiple interfaces
  • Of the same type
  • Of different types
  • Make Before Break Handoff
  • Use another network as a back-up SafetyNet

13
MBB with Two Interfaces
14
SafetyNet (1)
15
SafetyNet (2)
  • The main idea is to avoid upward vertical
    handoffs
  • Delay finalization of handoff
  • Receive any packets lost during the handoff at
    the finalization
  • SafetyNet protocol enables this by
  • Delaying upward vertical handoff until packet
    loss reaches an application dependent threshold
  • Combining Fast Mobile IPv6 buffering with
    bicasting and
  • Performing selective delivery of packets from
    buffer

16
Results for UDP - MBB
17
Results for TCP - MBB
18
Results for TCP continued
19
MBB Issues
  • MR and HA have inconsistent protocol state due to
    NEMO signaling and binding management being
    designed for BBM
  • Fixable modify binding management in the MR to
    accept packets on the old CoA
  • Collocated wireless cards
  • More problematic can be minimized by channel
    separation

20
Interference Effects
Effects of Active Scanning on UDP Downstream
Traffic.
Effects of Channel Separation on UDP Downstream
Traffic During Handoff.
H. Petander etal, Measuring and Improving the
Performance of Network Mobility Management in
IPv6 Networks, appear in JSAC Special Issue on
Network Mobility, Q4, 2006
21
Some Comments
  • The analysis showed that unoptimized handoff
    performance of NEMO would be unsuitable for most
    applications due to handoff latencies
  • Even with protocol optimizations the handoff
    latencies would still limit the suitability for
    performance sensitive
  • applications, such as Voice over IP.
  • The Make-Before-Break handoffs make it possible
    for a fast moving Mobile Router to take advantage
    of high speed but short range radio technologies
    without compromising the service it offers to
    Mobile Network Nodes.
  • There are a number of potential drawbacks to
    using multiple interfaces
  • increase in power consumption,
  • interference caused by the usage of multiple
    interfaces
  • increased size and cost.
  • These drawbacks apply mostly to Mobile Hosts and
    possibly not for Mobile Routers
  • An on-board Mobile Router is not limited by power
  • The ability to use physically separated external
    antennas
  • Incremental cost of additional interfaces will
    negligible

22
SafetyNet UDP Performance
23
SafetyNet TCP Performance
Effect of handoff on TCP progress during a 1s
window (t5s and t6s)
24
Over the Air Signaling and Data Tx Overheads
TCP Handoff Overhead
UDP Handoff Overhead
25
Some More
Experimental over the air data transmission -
Signaling and TCP resend overhead
H. Petander etal, Multicasting with selective
delivery A SafetyNet for vertical handoffs,
NICTA Technical Report 26-NPC-06, under review
26
Some Comments
  • SafetyNet provides a localized mobility
    management scheme for vertical handoffs which
    allows a Mobile Node to receive any packets lost
    during the handoff at the new Access Router.
  • Its selective delivery from the buffer at the new
    Access Router guarantees that only the lost
    packets are sent to the Mobile Node reducing the
    overhead of the handoff significantly.
  • The SafetyNet protocol together with a handoff
    timing algorithm would allow a Mobile Node to
    delay the finalization of an upward vertical
    handoff to a WWAN network and in some cases, to
    even avoid performing such a handoff.
  • This would enable a Mobile Node to increase its
    utilization of low cost WLAN networks

27
  • Thank you
  • Questions
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