IEEE 802. 16m SDD ToC for Inter RAT Handover
Document Number:
IEEE C802.16m-07/311r1
Date Submitted:
2007-11-08.
Source:
Jin Lee (jins978@lge.com),
Ronny (Yong-Ho) Kim (ronnykim@lge.com),
Kiseon Ryu (ksryu@lge.com)
LG Electronics, Inc.
Re:
TGm Call for Contribution on SDD, IEEE 802.16m-07/040
Abstract:
Discussion on IEEE 802.16m SDD ToC for Inter RAT Handover
Purpose:
To discuss and adopt inclusion of inter RAT handover in the 802.16m SDD to improve user experience of 802.16m mobile devices.
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Motivation for Inter-RAT Handover
• 802.16m Requirements
– IEEE 16m shall provide support for handover with other
RATs. However, an IEEE 802.16m MS is not required to be
multi-mode.
– IEEE 802.16m shall provide service continuity during
handover for both inter-RAT and intra-RAT handover.
– IEEE 802.16m should support IEEE 802.21 MIH services.
– IEEE 16m shall support inter working functionality to
allow efficient handover to other radio access technologies.
• IEEE 802.11
• 3GPP GSM/EDGE/UTRA/EUTRA
• 3GPP2 CDMA2000
Current 16e Reference Features
• 802.16e Mobility
– Not required to support inter RAT handover.
• Supports handovers within 802.16 homogeneous networks.
• Does not capture use cases when an MS moves within different
system environments.
– IEEE 802.21 MIH services may be used for inter RAT
discovery and selection.
• Limitation of having the MIH Function in an MS and a BS side.
• WiMAX NWG
– Provides the inter working architectures with 3GPP and
3GPP2 system at a network level.
Consideration for Inter RAT handover
• 16m BS shall provide inter RAT topology information.
– Inter RAT Type, Physical parameters, etc.
• 16m MS shall be able to transfer radio capabilities
– Single, multi radio, etc.
• Inter RAT cell selection
– Scanning configuration shall be differentiated depending on an MS’s
radio capabilities.
• Handover process
– Handover preparation shall be allowed to support service continuity.
• IEEE 802.21 MIH services should be used for inter RAT
discovery and selection.
• Security shall be considered based on each RAT to allow inter
RAT handover.
Proposed 16m Network Reference Model
Legacy BS
16m MS
Um
I
16m BS
NCMS
NCMS
U
Im
16m BS
Um
NCMS
NCMS
Um
16m MS
O*
Non-802.16 Radio
Access Technology
U
Legacy MS
NCMS
NCMS
16m Network - Legacy Support
16m Network – Disabled Legacy Support
Out of 802.16m Scope
O* : Interface between 16m BS and Non 802.16 networks. Not defined in IEEE 802.16m standard.
However, 802.16m shall provide IEs and primitives to support Inter RAT HO.
Suggested SDD ToC for Inter RAT Handover
• Inter RAT Handover
– Inter RAT topology acquisition
– Inter RAT mobility
• Scanning
– Single radio MS
– Multi radio MS
• Handover process
• Security for inter RAT handover