1. HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com Slide title :40-47pt Slide subtitle :26-30pt Color::white Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Huawei Technologies Co., Ltd. grant a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. Huawei Technologies Co., Ltd. is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution. This document has been prepared by Huawei Technologies Co., Ltd., to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Huawei Technologies Co., Ltd.. Huawei Technologies Co., Ltd. specifically reserve the right to amend or modify the material contained herein and to any intellectual property of Huawei Technologies Co., Ltd. other than provided in the copyright statement above. A40-20080615-yyy HW E-UTRAN to eHRPD Optimized Active Handover E-UTRAN to eHRPD Optimized Active Handover Xin ZhongHuawei Technologiesxinzhong@huawei.comxinzhong@huawei.com Zhiming LiHuawei Technologieslizhiming@huawei.comlizhiming@huawei.com Recommendation: Review and Adopt

2. HUAWEI TECHNOLOGIES CO., LTD. Slide title :32-35pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :20-22pt Bullets level 2-5: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”. Top right corner for field-mark, customer or partner logotypes. ---------------- A40-20080615-yyy HW E-UTRAN to eHRPD Optimized Active Handover Page 2 Inter-eAN Handoff Scenario during E-UTRAN to eHRPD Optimized Active Handover The scenario of Inter-eAN Handoff along with E-UTRAN to eHRPD Optimized Active Handover is identified As the AT performs handover execution procedure as in A.S0022-0, the MME will use the S101 tunnel with eAN2 (S101-2) to tunnel CR+RU message When the AT moves toward left as shown in the figure on the right side, the eHRPD eAN2’ signal fades in the same time as EUTRAN’ signal fades. However eAN1’ signal gets better and is qualified to provide radio connection with the AT eAN1 eAN2 A13 AT eAN1 S101-2 MME S101-1 eHRPD(eAN1) EUTRAN+ eHRPD(eAN2)

3. HUAWEI TECHNOLOGIES CO., LTD. Slide title :32-35pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :20-22pt Bullets level 2-5: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”. Top right corner for field-mark, customer or partner logotypes. ---------------- A40-20080615-yyy HW E-UTRAN to eHRPD Optimized Active Handover Page 3 Problem Statement The MME will use the tunnel with eAN2 (S101-2) to transmits the tunneled CR+RU message based on static pre-configuration of SectorID eAN2 finds out qualified target sector belongs to eAN1 and eAN2 can not allocate radio resource for the AT In this case, E-UTRAN to eHRPD Optimized Active Handover will fail

4. HUAWEI TECHNOLOGIES CO., LTD. Slide title :32-35pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :20-22pt Bullets level 2-5: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”. Top right corner for field-mark, customer or partner logotypes. ---------------- A40-20080615-yyy HW E-UTRAN to eHRPD Optimized Active Handover Page 4 Suggest Remedy Add a forwarding mechanism in A13 interface to tunnel S101 message transparently between eANs S101 Protocol Stack is similar with A13 Protocol Stack, which makes encapsulation of S101 message over A13 message easy S101 Protocol Stack (TS23.402) A13 Protocol Stack (A.S0008-C)

5. HUAWEI TECHNOLOGIES CO., LTD. Slide title :32-35pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :20-22pt Bullets level 2-5: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”. Top right corner for field-mark, customer or partner logotypes. ---------------- A40-20080615-yyy HW E-UTRAN to eHRPD Optimized Active Handover Page 5 Benefits of the remedy No impact to MME routing mechanism of S101 messages. Minimum impact to current HRPD interface  Add a simple tunnel mechanism to forwarding S101 message  Reuse A13 procedure to retrieve the AT’s session from the source eAN when session transfer happens

6. Thank You www.huawei.com