Www.mobilevce.com © 2008 Mobile VCE 1PIMRC Ubiquitous Workshop 2008 A Combined Mobility and QoS...

www.mobilevce.com© 2008 Mobile VCE

1PIMRC Ubiquitous Workshop 2008

A Combined Mobility and QoS Framework for Delivering Ubiquitous Services

Dev Pragad Audsin, George Kamel, Paul Pangalos and Hamid Aghvami

Mobile VCE ResearchCentre for Telecommunications Research

King’s College London

PIMRC Workshop “Ubiquitous Services over heterogeneous mobile networks”

Cannes, France, 2008



Outline of the Presentation

Mobility and QoS interactions

Concept of Enhanced Nodes: A framework for providing seamless access

Mobility and QoS Functions of Enhanced Nodes

An Example: QoS based Mobility Selection

Conclusions



Mobility and QoS Interactions

Interactions between mobility management and QoS have been well-studied in the literature Negative interactions between QoS and mobility Usually in the form of a delay during handover Such interactions can cause disruption to on-going

data sessions

It has been recognised that in order to be able to support any form of real-time applications, negative interactions must be suppressed

We propose a framework based on Enhanced Nodes to minimise some of the negative interactions



Need for Enhanced Nodes

Existing networks are often static

Existing networks often have no framework to provide cooperation between mechanisms such as mobility and QoS

Many of the mobility, QoS and security functionalities have (negative?) interactions with each other

Hence, a framework for network enhancement is required

This framework is provided by Enhanced Nodes



Enhanced Nodes (EN)

ENs add more intelligence to the network and contain Mobility, QoS and Security functionalities

The Mobility functionality subsumes the role of Mobility Anchor Point in HMIPv6

QoS aspect of the EN subsume numerous functionalities including QoS re-establishment after handovers

The ENs have a common communication link established between them to share mobility and QoS information of the network and MNs



Enhanced Node Framework

NEXT GENERATION INTERNET

Access Network B

EN EN

ENEN

EN

EN

Access Network A

Interworking of Mobilty, QoS and Security

BBBB GW GW

AAAAAA

Network layer

Link Layer

Mobility QoS Security

Intra-network signalling



Intra-Network EN Functionalities

The presence of ENs facilitate communication and sharing of information within a network

This can lead to better load balancing, network routing / forwarding and QoS path reservation.

The ENs can facilitate handovers between Mobility Anchors (MA) and provide the new MA with information regarding the MN (MA is part of EN functionality).

The ENs can help optimise network performance by providing the network with intelligence required to adapt according to the network state (Example)



QoS based Mobility Protocol Selection

We provide a solution to a mobility and QoS Routing negative interaction

In agent based micro-mobility protocols such as HMIPv6 and NetLMM, the Mobility Anchors acts as a point through which all traffic traverses

This can lead to congestion and overloading of Mobility Anchors while at the same time cause routing overheads and affect the best QoS path

Previous work shows that this leads to routing overheads and network congestion and reduction in network capacity



Introduction to the Problem

Internet

Mobility Agent

Flow using Mobility Agent

There can exist under utilized paths with better QoS resources

The presence of Mobility Anchors can potentially prevent the best QoS path to be selected by the QOS routing



Solution with ENs

The ENs can play a very vital role to enhance existing networks and provide solutions to problems such as this

In this problem we aim to have some interaction between mobility and the QoS routing to maximise network performance

We aim to achieve this through selecting the best mobility binding update (protocol) for the variety of classes the network supports

This solution will allow more number of high QoS applications to have efficient micro-mobility support



Proposed Solution

Route low QoS traffic classes when possible around Mobility Anchors

Utilise the lesser congested paths that are under utilised due to routing constraints induced by Mobility Anchors

The lower QoS traffic classes can sustain higher handover delays when they do not use Mobility Anchors

The Enhanced Node can provide the framework to support this solution



Traffic Class to Mobility Selection

UMTS Traffic Class Example Type Mobility

Protocol

Conversational Voice Real Time HMIPv6

Streaming Video/Audio Streaming Real Time HMIPv6

Interactive Web browsing Best Effort MIPv6

Background Emails Best Effort MIPv6




Slide 13 / 22

Enhanced Node Signalling

Mobile Node Enhanced Node Gateway Bandwidth Broker

Signalling (Network State)

Registration Request (Binding Update)

Perform calculation on classes to use micro-

mobility and the potential paths these classes can

take to maximise utilisation the of network resources

BU ACK with classes to use micro-mobility



Advantages of the proposed solution

The traffic load and distribution within the network can be balanced efficiently, this case is exemplified for a NEMO network

Micro-Mobility support is prioritised for applications with high QoS requirements such as VoIP and video conferencing

This can increase the number of active higher QoS sessions in the network since these sessions cannot run efficiently without micro-mobility support in a mobile environment



Conclusion

Provided a framework for network enhancement through Enhanced Nodes

Covered the Mobility and QoS aspects of the Enhanced Nodes functionality

Investigated the negative interaction between Agent based micro-mobility solutions and QoS routing within a network

Proposed a EN assisted QoS traffic class to mobility selection mechanism to reduce the negative interaction between micro-mobility and QoS routing



Thank you !

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