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. Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

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 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 topology acquisition Inter RAT mobility Scanning Single radio MS Multi radio MS Handover process Security for inter RAT handover