15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop Femto Cell Service Requirements and Issues Norikazu （ Nick ） Yamasaki Ryuhei Munakata KDDI Corporation

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 2 Benefits of Femto Cell Deployment 1 ． Improvement of Indoor Coverage and Capacity -Supplement of Macro Cell (high-rise apartment / building, home and office out of macro cell coverage) -Improvement of Users’ Convenience 2. Offloading Macro Cell Traffic to Femto Cell -More than 50% of busy-hour traffic originating from residences and increasing -Homes with broadband Internet connection rapidly increasing -Operators can increase system capacity. Leads to more efficient frequency utilization. 3 ． Acceleration of Fixed/Mobile Convergence

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 3 IP Based Network Mobile Macro Network Macro Cell Femto Network Equipment Subscriber’s home Outdoor Indoor : Femto Cell Outdoor : Macro Cell Same Handset available both outdoor and indoor Femto Cell AP Basic Concept of Femto Cell Service Subscriber’s Broadband Circuit

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 4 Population Density Large Small LowHigh Building Size Redevelop- ment Project area, Event Site Redevelop- ment Project area, Event Site Small Shop Small Office Home Office Small Shop Small Office Home Office Super Market Restau -rant Super Market Restau -rant Shoppin g Center, Office, Subway, Under- ground Shoping Center Shoppin g Center, Office, Subway, Under- ground Shoping Center Residenc e Apartmen t Rural Area Urban Area Indoor Outdoor Femto Cell Target Area of Femto Cell Deployment

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 5 General Requirements for Femto Cell Standardization 1. Services and Functionality (1) Support all the features and services of legacy CDMA1X/HRPD via Macro Cell (2) Support 1X CS Voice Call (3) Consideration for future VoIP Services (4) Need to support BCMCS 2. Interference Management Need mechanism to control and minimize interference with Macro Cell and other Femto Cell → Easier to use the frequency band which is not used for Macro Cell? 3. Mobility Management Mobility management with Macro Cell is desirable. However, if there is any impact on cost and standardization schedule, operators should be able to select specific functions for implementation.

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 6 Issues on System Selection 1. System Selection function is definitely needed for Femto Cell services. 2. No modification on existing handset (manageable by network implementation is desirable). 3. Must determine the most effective System Selection method from Macro Cell to Femto Cell (for example: Manual switching function using scanning search for the Femto frequency)

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 7 System Synchronization Issue ・ System synchronization of CDMA2000 is fully based on GPS. -Current Interference Management system is dependent on GPS signal reception. ・ In Japan, - Difficult to receive GPS signal in house (especially reinforced concrete type apartment/building) - Difficulty in cabling in the case of external antenna Therefore: 1.Need to develop new system synchronization method other than GPS 2.Need to develop effective interference management system which is working when GPS signal is not available

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop HRPD/1x Femto AP FNG PDSN Call Manager PCF/ RAN A1/A2 A10/A11 SIP Possible Network Architectures HLR HRPD/1x Femto AP FNG PDSN PCF/ RAN A10/A11 SIP IS-41 IMS HLR The figures below are example of Network Architecture to provide CDMA Service continuously even in the Femto Areas without impact on Legacy CDMA systems. MSC Fig.1: use current Circuit Switch systemFig.2: introduce IMS system for Voice Service

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop 9 Requirements on Workplan 1. Best Case Completion of Standardization for Femto Cell (1) Completion by Mid 2008 (2) Phased approach should be considered. Initial phase : Minimum set (less options) 2. Handover between Femto and Macro Cells Mobility management function with Macro Cell is desirable. However, if there is any impact on cost and standardization schedule, operators should be able to select specific functions for implementation. In this regard, this Handover between Femto and Macro Cells function should be an optional requirement in specification, or phased approach is needed. 3. Issues that Must Be resolved (1) System Selection Function (2) System Synchronization

15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop Thank you!