C Title: Next Steps for Femtocells Date: 03 December 2007 Source: Airvana, Alcatel-Lucent, Nortel Abstract:The contribution addresses next steps in WG3 for femtocell technology development Contact: Balaji Raghothaman, Doug Knisely Subramanian Vasudevan Geng Wu Recommendation: Review and adopt cdma2000® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Airvana, Inc., grants 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. Airvana, Inc., 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 Airvana, Inc., 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 Airvana, Inc. Airvana, Inc., specifically reserves the right to amend or modify the material contained herein and to any intellectual property of Airvana, Inc.,other than provided in the copyright statement above.

C Background Femtocells are of great interest in the wireless community at present. A femto work item has been approved in 3GPP2, and the requirements work is in progress [1] Femtocells can be built using current air interface standards, but performance can be optimized / improved with standards changes. As part of the femto workshop [2], air interface issues were discussed, including modeling, interference, synchronization etc. Some contributions related to modeling have been presented in WG3 [3] and the femto workshop [4].

C Next Steps Develop a WG3 work plan for femtos We propose the creation a femtocell ad-hoc to channel work related to femtocells Priority for 1X and DO related work.

C Scope of proposed Ad-Hoc Develop simulation methodology for femtocells, including modifications to channel models. Create feasibility document with benchmark simulations –Macro-femto co-channel deployments –Dedicated femto deployments Specify air interface enhancements for future femtocells. Examples are: –Interference management techniques –Radio aspects of system selection behavior, mobility management, access control Specify changes to the minimum performance specification

C Timeline Airvana’s view of the timeline: –Modeling and feasibility study – 1Q 2008 –Standardization Stage 2: 2Q 2008 Stage 3: 3Q 2008

C References 1.S.P0126 v0.1.6, “System Requirements for Femto Cell Systems”, Nov C , Summary of 3GPP2 Femto Cell Workshop. 3.C R1, Femtocell Modeling for Simulations, Airvana, July S00-FEMTO , Interference Management in Femto Cell Deployment, Qualcomm, Oct 2007.