1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-08-0266-00-0000
Title: Enabled Handovers in IMT-Advanced
Date Submitted: September, 2008
Presented at IEEE session #28 in Kona
Authors or Source(s):
Les Eastwood (Motorola)
Vivek Gupta (Intel)
Abstract: enabled Handovers for IMT-Advanced

2. IEEE 802.21 presentation release statements
This document has been prepared to assist the IEEE Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE
The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws < and in Understanding Patent Issues During IEEE Standards Development
IEEE presentation release statements
This document has been prepared to assist the IEEE Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE
The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual < and in Understanding Patent Issues During IEEE Standards Development

3. IMT-A/802.11/802.21 Meeting Goals Sep-08
Background
IMT-A solution requires use of
Also allows to be compliant with solution
not sure about close connection with in its IMT-A solution
would consider as a media independent handover mechanism for non technologies
Goals
What options should be favored by ?
Can provide handover features for IMT.TECH?
Bruce Kraemer (Marvell)

4. Outline Overview of 802.21 IMT-Advanced Vision/Goals
How enables to meet IMT- Advanced Requirements
And how it will enhance the proposal
for IMT-Advanced
Summary

5. IEEE 802.21: Overview L2 Triggers & Measurements Network Information
MIH Function
Protocol and Device Hardware
Applications (VoIP/RTP)
Connection Management
WLAN
Cellular
WMAN
L2 Triggers and Events
Information Service
Mobility Management Protocols
Smart Triggers
Handover Messages
Handover Management
Handover Policy
IEEE
IETF
L2 Triggers & Measurements
State Change
Predictive
Network Initiated
Network Information
Available Networks
Neighbor Maps
Network Services
Handover Commands
Client Initiated
Vertical Handovers
provides Vertical H/o solution across IEEE Technologies

6. Down selection Initial 802.21 Draft Text
History & Timeline
1H 2004
2H 2004
1H 2005
2H 2005
1H 2006
2H 2006
Year 2007
Year 2008
WG Created
14 Initial Proposals
WG Letter Ballot
Sponsor Ballot
Deployment*
Initiate Amendments to u, g. IETF (MIPSHOP) on L3
Spec Ratified*
Call For Proposals
Down selection Initial Draft Text
*Projected Timelines
Two New Study Groups (July – 2007)
Security in Handovers
Multi-Radio Power Management

7. ITU-R’s Vision for IMT-Advanced (“4G”)
For 4G, the International Telecommunications Union-Radio Sector (ITU-R) sees a need for new wireless access technology.
The new technology must support data rates much higher than IMT-2000’s (or 3G’s) 30Mbps maximum.
Motivation: deliver wireless services competitive with broadband wireline.
ITU-R’s vision for new IMT-Advanced concept:
100 Mbps for highly mobile access (at speeds of up to 250 km/hr)
1 Gbit/s for low mobility (pedestrian speeds or fixed) access.

8. ITU-R’s IMT-Advanced Vision

9. IEEE 802’s Responses to IMT-A Vision; 802.21’s Roles
IEEE 802 extending both IEEE and for IMT-Adv
IEEE ’s new m spec:
highly mobile (250km/hr.), high data rate (100Mbps), extension of
IEEE Very High Throughput (VHT)
up to 1Gbps, at stationary or pedestrian speeds
Together, m and VHT satisfy the ITU vision
IEEE adds mobility between VHT and m, and creates a single, integrated system for IMT-Advanced
Ties the two radio systems together into one
Improves m proposal
Enables proposal
Possible basis of a dual-radio proposal (SRIT)
Capable of smooth handovers required in IMT.TECH

10. Handovers in a Dual-Radio (e. g. 802. 16m/ 802
Handovers in a Dual-Radio (e.g m/ VHT) IMT-Advanced System

11. HO Challenges; 802.21 Solutions
Challenges in Inter-Technology Handovers
Description
Based Solutions
Network Discovery and Selection
Handover decision making entity must continuously evaluate available access networks in a power efficient manner
IEEE enables inter-RAT (Radio Access Technology) network advertisements and also provides a mechanism to query candidate target networks (based on UE—User Equipment--location) and their properties. Requires L3 mobility signaling and a L3 anchor across networks. IEEE provides link layer triggers that can optimize the performance of these L3 mobility management protocols.
IP Session Continuity Low Latency and Single Radio Transmission Handovers
Minimizing user disruption during handover requires session continuity when transitioning across radio technologies.
Minimize handover latency to support real-time multimedia applications.Co-existence and interference issues may mandate that only one radio in a dual-radio UE can transmit at a given time during handovers.
Both issues require target network preparation, while still connected to the source network. IEEE provides signaling for resource query and resource reservation on the target network. This also requires inter-RAT interface between access gateways.
Operator control in Target Network selection
Operators may want to control/influence which target network the user selects. Thus there is a need to support network-initiated handovers. This also requires reporting radio measurements (e.g. link signal strength) across different radio access networks.
IEEE enables operators to enforce handover policies and decisions and also. A crucial issue for operators. enables inter-RAT measurement reporting.

12. IEEE 802.11 and 802.16 Drafts Already Incorporate 802.21
802.16g amendment incorporates enhancements
participants contributing into m requirements
IEEE
802.11u amendment incorporates enhancements

13. Summary (1)
IMT-Advanced (or “4G”) apps require both mobility and 1 Gb/s peak data rate
At least two radio technologies needed
Proposals for IMT-Advanced are likely to come from both IEEE and
IEEE m for 100 Mb/s high mobility
higher data rate fixed adjunct can enhance
VHT for 1 Gb/s at lower mobility
needs a mobile adjunct to meet IMT-Adv requirements
Implies an added need for technology to integrate dual radios into one system,
enabling handovers
particularly for real-time and streaming applications, these handovers should be imperceptible to the user (or seamless).

14. Summary (2)
IEEE can provide the glue to enhance m’s proposal and to enable VHT’s
by enabling seamless handovers between these two radio systems
and for other cellular or IEEE 802 radios
IEEE adds unique value by supporting the challenging decision and pre-execution phases of intertechnology handovers, key determinants of latency.
provides mechanisms to prepare the target network before handover execution occurs, reducing latency

15. Backups on Handover Options 1 thru 5 (Chart #10)

16. Five Handover Options Handover Option Description User Mobility Status
Example Motivation for Handover
Comment
Option 1
To a higher data rate radio access method
Low user velocity both before and after handover
User launches new application that needs higher data rate
Option 2
To a higher data rate, lower mobility access
High user speed initially, but decelerating to low speed
User is running an application whose performance will improve with higher data rate
Option 3
To a lower data rate, higher mobility access
Low speed initially, but accelerating to high mobile speed
Handover mandated by loss of low mobility access method
Possible challenge: Application as set up before handover can not run at lower data rate
Option 4
To lower or higher data rate access
No change in mobility status
Hand over to less costly access method
User or operator could initiate
Option 5
Traffic or congestion management
Operator is likely initiator

17. Example 802.21 Messaging for Option 2 Handover