Event services and command services for media independent handover
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Event Services and Command Services for Media Independent Handover. Presentation prepared by: Srini Sreemanthula Presented by: Greg Daley, with some additions MIPSHOP IETF 64. IEEE 802.21 Introduction.

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Event services and command services for media independent handover

Event Services and Command Services for Media Independent Handover

Presentation prepared by: Srini Sreemanthula

Presented by: Greg Daley, with some additions

MIPSHOP

IETF 64

MIPSHOP – November, 2005


Ieee 802 21 introduction

IEEE 802.21 Introduction

  • IEEE 802.21 WG defines media independent handover (MIH) services that enable handoffs from one link technology to another involving subnet changes

  • MIH services aid in handoff based on existing mobility management protocols

  • MIH services are classified as 3 types

    • MIH Information Services

    • MIH Command Services

    • MIH Event Services

MIPSHOP – November, 2005


What mih provides

What MIH provides

  • MIH service carry L2 information that is processed locally or carried to some other network node, remotely

  • MIH Services enable two facets of inter-technology handover

    • Inter-technology Network selection

    • Handover control

MIPSHOP – November, 2005


Es cs introduction

ES/CS Introduction

  • Event Services (ES) provide:

    • indications from one layer or functionality to another about changes in the connectivity state.

    • Remote ES convey information from one network node to another

  • Command Services (CS) provide:

    • mechanisms for controlling handovers or functions aiding handovers.

    • mechanisms to establish, redirect, or remove state in either the network or mobile node, so that handovers occur smoothly.

    • Remote CS convey information from one network node to another

MIPSHOP – November, 2005


Motivations

Motivations

  • 802.21 functional definitions are to enable two scenarios

    • Terminal centric/controlled

    • Network centric/controlled

MIPSHOP – November, 2005


Terminal controlled handover

Terminal Controlled Handover

  • Terminal makes all the decisions of network selection and initiates HO control

  • Can utilizes native L2 signaling or L2/L3 MIH ES/CS and L3 IS services

  • Used in operator, enterprise or individual user scenarios

MIPSHOP – November, 2005


Network controlled handover

Network Controlled Handover

  • Network makes decisions of network selection in coordination with the terminal and initiates HO control

  • Assumption is that

    • network selection is in core network (beyond L2)

    • HO control resides where MME (common to both accesses) resides (beyond L2)

  • This requires that L3 MIH IS, ES and CS services are available

  • Important for operator models with multiple access technologies

MIPSHOP – November, 2005


Motivation summary

Motivation Summary

  • Higher layer MIH ES/CS services provide architectural flexibility for 802.21 deployment

    • does not need 802.21 in certain link technologies

  • ES/CS are utilized for both network selection and handover control

    • Applicable to network entity common to both media types

    • Not scalable to provision these functions within subnet

  • Easier and faster 802.21 adoption in other SDO e.g. 3GPP

  • Can coexist or share functions with MIH ES/CS at L2

MIPSHOP – November, 2005


Es cs service model

ES/CS Service Model

  • Event Service model

  • Command Service Model

Other

triggers

Other

Sources

Other

triggers

MIHF

(ES)

MIH

(ES)

Other

Sources

Remote ES

Link

Indications

Link

Indications

Network

Node

Link

Layer

Link

Layer

Network

Node

Other

layers/

functions

Commands

MIHF

(CS)

MIH

(CS)

Remote CS

Link

Commands

Commands

Network

Node

Link

Layer

MME

Network

Node

MIPSHOP – November, 2005


Usage models direct and proxy models

Usage ModelsDirect and Proxy models

  • Direct model

  • Proxy model

Remote ES/CS

MIHFUE

MIHFMME

MIHFUE

Remote ES/CS

MIHFproxu

Remote ES/CS

MIHF

MIPSHOP – November, 2005


Nw initiated nw selection

MME

MIHFNW(IS)

MIHFUE

802.11-AN

802.11-AN

MAC Layers

802.16-AN

NW Initiated NW Selection

UE

Network Operator

UE Discovery and Registration

MIH-Register-Event.Req()

MIH-Register-Event.Resp()

DL-Burst*

Link-Detect

Link-Event.Detect(link_info)

MIH-Info.Req

MIH-Info.Resp

Unfavorable

Network

Beacon

Beacon

Link-Detect

Link-Event.Detect(link_info)

MIH-Info.Req

MIH-Info.Resp

Favorable

Network => Selection

MIPSHOP – November, 2005


Nw controlled ho

802.11-AN

MIHFUE

Mobile IP

HA

New-FA

802.11 MAC

MME

NW Controlled HO

Operator Network

UE

802.11 Network

Network Selection

Legend

Mobile-IP Signaling

MIH-Remote-Link-Switch.Req(802.11 nwk)

MIH signaling

over new link

L3-switch.Ind

Proxy Rtr Solicitation

Proxy Rtr Advertisement

Link-Associate

L2-Procedures (Security, Re-association, QoS Neg.)

Link-Event-Up(802.11 nwk)

MIH-Link-Event-Up

FBU

Mobile IP update procedure over new link

Release

MIH-Remote-Link-Switch.Resp

MIPSHOP – November, 2005


Remote es cs feasibility

Remote ES/CS Feasibility

  • Discussion relevant due to:

    • Adoba, B., "Architectural Implications of Link Indications draft-iab-link-indications-03.txt", June 2005.

  • Explicit signaling required

    • Intertechnology handover may not result in IP subnet change

  • Mitigation of security issues

    • Trust issues

  • Mapping of identifiers

    • Done at the UE

MIPSHOP – November, 2005


Explicit signalling

Explicit Signalling

  • Command and event signalling

  • Implicit signalling possible

    • when path changes or link-aware routing metrics from access network

  • Explicit signaling required

    • Intertechnology handover may not result in IP subnet change

    • May inform devices of mobility management issues which aren’t apparent in the current access net

    • Needs safeguards to ensure damping/robustness

MIPSHOP – November, 2005


Identifier mappings

Mobile Node

Network

Appl/

MIHF

Link-

MME

Trans/

ES/CS

Layers

Netw

Mapping of

Local Identifiers

Discovery

Registration

Authentication

Security Association

Media independent host ID

Identifier Mappings

  • May be possible to make identifier mappings

MIPSHOP – November, 2005


Es cs higher layer requirements

ES/CS Higher Layer Requirements

  • Work is similar to IS higher layer MIIS for

    • Identifying usage scenarios

    • Provisioning models e.g. proxy and direct

    • Finalizing ES/CS MIH functionality

      • Message sequences, message types, data elements associated with each message

  • Other higher layer requirement categories

    • Transport Layer

    • Discovery

    • Registration and Deregistration

    • Capability negotiation

    • Security

    • Reliability and failure recovery

MIPSHOP – November, 2005


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