15-16 october 2007, 3gpp2 tsg-s femto cell workshop femto cell service requirements and issues...
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15-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
Femto Cell Service Requirements and Issues
Norikazu ( Nick ) Yamasaki Ryuhei Munakata
KDDI Corporation
215-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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
315-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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
415-16 October 2007, 3GPP2 TSG-S Femto Cell WorkshopPopulation Density
Large
SmallLow High
Bu
ild
ing
S
ize
Redevelop-ment Project a
rea,Event Site
Redevelop-ment Project a
rea,Event Site
Small ShopSmall Office
Home Office
Small ShopSmall Office
Home Office
Super Market
Restau-rant
Super Market
Restau-rant
Shopping Center,Office,
Subway,Under-ground Shoping Center
Shopping Center,Office,
Subway,Under-ground Shoping Center
Residence
Residence
Apartment
Apartment
Rural AreaRural Area Urban Area Urban Area
Indoor
Outdoor
Femto CellFemto Cell
Target Area of Femto Cell Deployment
515-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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.
615-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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)
715-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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/1xHRPD/1x
Femto AP
FNG
PDSN
CallManager
PCF/RAN
A1/A2
A10/A11
SIP
SIP
Possible Network Architectures
HLRHRPD/1xHRPD/1x
Femto AP
FNG
PDSN
PCF/RAN
A10/A11
SIP
SIP
IS-41
IMSIMS
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 system Fig.2: introduce IMS system for Voice Service
915-16 October 2007, 3GPP2 TSG-S Femto Cell Workshop
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!Thank you!
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