source: qualcomm incorporated contact: peerapol tinnakornsrisuphap, jun wang, george cherian march...

Source: Qualcomm IncorporatedContact: Peerapol Tinnakornsrisuphap, Jun Wang, George Cherian

March 1, 2010

3GPP2 Femtocells Phase II Standards

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Femtocell Standardization Status

Phase I of 3GPP2 femtocell specifications have been completed, except for last four documents:S.R0126-0 (System Requirements for femtocell Systems)S.S0132 (Femtocell Security Framework)X.S0059-000, 100, 200 (Femtocell Network Specs)A.S0024-0: Femtocell A interface SpecC.S0005-E (Includes 1x femtocell Air interface enhancement)C.S0024-C (Includes HRPD femtocell Air Interface

enhancement)C.S0016-D (Includes PUZL for femtocell OTA provisioning)X.S0059-400 (Femtocell Supplementary Services) C.S0032-C (Includes Femtocell Minimum Performance

Specifications)X.R0063 (Femtocell Management Object)S.R0139 (Femtocell Systems Overview/Guideline)

Highlights of Phase I featuresThe followings are highlights of Phase I features:

1x Femtocell architecture (SIP/IMS) and HRPD Femtocell architecture

Security FrameworkEnhanced System Selection1x air-interface enhancement for femtocellsMobility support for

1x active and idle handoff between femtocell and macro network

HRPD idle handoff between femtocell and macro networkLocal IP Access and Remote IP Access servicesOpen TR-069 provisioning interface along with

management objects definitionsFemto Minimum Performance Specification

New Features/Capabilities in Phase II Work Items

3GPP2 System Enhancements for Femtocell Support Phase II (00242) includes but not limited to: Cdma2000-1x IOS based architecture IMS based architecture enhancements Backhaul optimization: Header compression and other mechanisms to

reduce backhaul capacity requirements. Femto Access Control Enhancements: Provides full support of this feature,

for example, enterprise femto access control. Mobility enhancements: cdma2000-1x hand-in improvements, HRPD active

hand-in, femto-femto handoff, etc. Femto flatter architecture: Support of a flatter architecture (for example, by

bringing PDSN function on to the FAP). Synchronization enhancements: Mechanisms for synchronization that does

not depend on GPS or when GPS signal is inadequate. Enhanced interference management: Support schemes that may require

communication between femto cells or between femto cell and macro cell to reduce interference.

Other new features such as enterprise features, femto zone services, etc.

Femtocell Phase II Features Requested by CDG

Femtocell Phase II Features received from CDG (see X00-20100125-026A TSG-X Work Item Priority Survey) Enhancements to support services (a.ka. Femtozone services) available through access

via the FAP (Femtocell Access Point) Enhancements for the management of Femto systems in the mass market (e.g. enhanced

auto-configuration, user-profile driven customization etc.) Deployment guidelines for the mass market IMS based architectural enhancements towards an all IP NGN Mobility enhancements to support 1x and HRPD active hand-in, FAP-to-FAP handover Flat architecture: Adoption PDSN functions at the FAP Synchronization enhancements in the Femto system, when a GPS signal is weak or absent Enhanced FAP access control (e.g. enterprise FAP access control etc.) Enhanced interference management between FAPs and between FAPs and Macrocells Backhaul optimizations, such as header compression etc. to enhance backhaul utilization. Detection of the loss of IP backhaul to enhance the user-experience by automatically

enabling the mobile device to re-tune to another FAP, or to the Macro system

Note: The red items above are already covered in current Femtocell Release II WI (see previous page).

Additional Features in Consideration

The following additional features may need to be considered:Local and Remote IP Access EnhancementsEfficient Routing for Enterprise FemtocellsE-UTRAN Interworking

Phase II Family of Specifications

The following specifications may be affected as part of femtocell phase II specificationsS.S0126S.S0132A.S0024C.S0005C.S0016C.S0024C.S0087X.S0059 part 000, 100, 200 and 400X.R0063 S.R0139

Per work item, the target completion for Phase II specifications is Q4 2010

Femtocell Zone EnablersScope

Femtocell zones allow a user to be recognized at a femtocell and enable the MS presence information at the femtocell to be available to applications

Femtocell zone enablers are presence, interaction and association

To support femtocell zones in 3GPP2:Develop MS/AT and network based presence indicationsDefine protocols / procedures to update the presence

server (using existing presence-application mechanisms)Potential Standard impact

A.S0024X.S0059

Femtocell Backhaul Bandwidth Optimization

ScopeInvestigate methods for backhaul bandwidth

savingsBackhaul IPsec traffic tunneling imposes a significant

percentage of bandwidth overhead for voice traffic (small payload, frequent packet interval at about 20ms)

The problem is more significant for uplink traffic in a typical DSL (128-256 kbps)Per Phase I specification, a 1x call consumes a peak rate

of 78kbps of uplink backhaul (including all headers)Optimize backhaul bandwidth for 1x CS calls

Target to support 4 simultaneous calls within 200kbps (uplink)

Potential Standard ImpactA.S0024X.S0059

1x IOS-based Architecture SupportScope

Support for Femtocell 1x IOS based Voice ArchitectureSIP-based transport is used in Phase I femtocellsSupport A1/A1p between FGW and MSC/MSCeSupport a TBD interface (e.g., A1p) between FGW

and FAPSupport Femtocell specific enhancements (e.g., FAP

registration, active hand-in) to the IOS interfacesPotential Standard impact

A.S0024X.S0059

Femtocell Access Control EnhancementsScope

Provide an efficient and scalable solution to femtocell access control for enterprise femtocell deployment

For 1x femtocell architecture, support a centralized femtocell access control in operator’s network entity In Phase I specification, for HRPD, either FAP or AN-AAA can perform

femtocell access control. For 1x, only FAP can perform femtocell access control

Investigate a simple solution for the end user with a dynamic user Access Control List provisioning

Investigate the relationship between femtocell access control function and emergency services/priority services

Potential Standard impactX.S0059A.S0024

Local and Remote IP Access Enhancements

ScopeInvestigate an optimized mean to support broadcast

IP packets for both LIPA and RIPABroadcast IP packets are generated frequently in a typical

local-area network. Without further optimization, delivering these packets to the AT over LIPA/RIPA can impact femtocell capacity and AT standby time

Investigate the possibility of supporting Remote IP Access without using operator’s backhaulIt may be possible to establish a direct tunnel between the

AT and the femtocell access point, thus offloading operator’s backhaul from RIPA traffic

Potential Standard impactX.S0059

Efficient Routing for Enterprise Femtocells

ScopeSupport efficient routing of 1x voice traffic in an

enterprise environmentWhen two 1x MS under different FAPs in the same

enterprise network talk to each other, the voice path unnecessarily traverses the backhaul into the operator’s network

Regardless of the enterprise topology being used, it is possible to have a solution where traffic can be more efficiently routed while still fully support mobility and supplementary services

Potential Standard impactX.S0059A.S0024

E-UTRAN interworkingScope

Support of eHRPD functionality for FAP Support IP session continuity for eAT/UE between:

eHRPD Femtocell and eHRPD macro network E-UTRAN Femtocell and eHRPD macro network eHRPD Femtocell and E-UTRAN macro network

Optimized active-handoff support from E-UTRAN-macro to eHRPD Femtocell

Enhance the system selection mechanism to allow selection between eHRPD Femtocell/E-UTRAN Macro and E-UTRAN Femtocell/eHRPD macro

Potential Standard impact X.P0059 A.S0024 C.S0087 C.S0016

Femtocell Management Objects Enhancements

ScopeAdd support for Phase II femtocell features into

standard 3GPP2 Femtocell Management Objects

Improve support for self-configuration of femtocells

Potential Standard impactX.R0063Broadband Forum TR-196 specification

Flatter ArchitectureScope

Allow PDSN function in femtocell, for example, PPP link is terminated in the FAP.

May need to specify a new interface between FAP and FGW

May need to add additional functions in FGWPotential Standard impact

X.P0059A.S0024

Synchronization EnhancementsScope:

Provide a mechanism for FAP synchronization that does not depend on GPS or when GPS signal is inadequate

Potential Standard impactTBD

IMS EnhancementsScope:

Specify full support for supplementary services

Allow for individual IMS registration from FAP for each 1x MS

Potential Standard impactX.S0059-400X.S0059-200

Deployment Guidelines for the Mass Market

ScopeProvide guidelines for femtocell deployment

including both residential and enterprise environment

Recommend optimal procedures and parameter settings in femtocell deployment

Address the issues that are considered useful in a real world phased deployment scenario

Potential Standard impactS.R0139

Detection of the Loss of IP Backhaul

ScopeWhen FAP detects the loss of IP backhaul,

allows FAP to indicate the mobile deviceEnhance the user-experience by

automatically enabling the mobile device to re-tune to another FAP, or to the Macro system

Potential Standard impactTBD

Mobility EnhancementsScope

Support HRPD active hand-in for both legacy terminals and femtocell-enhanced terminals

Simplify 1x active hand-in solution for legacy macro BSCurrent active hand-in solution for femtocell-enhanced terminal

requires macro network upgrade for the terminal to convey the target femtocell identity

By embedding the target femtocell identity in a pilot report, it is possible to have a solution where macro network upgrade is not needed

Support the active hand-in for 1x IOS-based FemtocellsSupport handoff between femtocells

Potential Standard impactA.S0024C.S0024-C (in V&V) and C.S0005

Enhanced Interference Management (IM) Techniques

Motivation: IM is critical for femtocell deployments Even when femtocells are deployed on a dedicated carrier, beacons can

interfere with macro users Need solutions that ensure robust performance for co-channel femto and macro

deployments Enhanced IM techniques can complement traditional techniques (e.g. network

listen base power calibration) and optimize performance Scope: Enable Enhanced IM using over-the-air (OTA) and/or backhaul

signaling OTA based IM to control femto FL interference

Idle mobile sends an OTA message using access probes to a restricted (interfering) femtocell upon detecting strong pilot from this femtocell

OTA based IM to control RL interference from femtocell users to macro network Femtocell controls max. Tx power of active home mobiles to limit RL interference

Backhaul based IM to control femto FL interference Co-ordination between macro base stations and femtocells via backhaul to reduce

femtocell interference to macro users Potential Standards Impact

C.S0005, C.S0024, A.S0024

ConclusionsThe following femtocell Phase II features may impact on

TSG-AFemtozone services (Effort: Medium)Backhaul Bandwidth Optimization (Effort: Medium)Enhancements for the management of Femto systems in the mass

market (Effort: Medium)Deployment guidelines for the mass market (Effort: High)Enhanced FAP access control (e.g. enterprise FAP access control etc.)

(Effort: Medium)Synchronization enhancements (Effort: TBD)Flatter architecture (Effort: High)Cdma2000 1x IOS based architecture (Effort: TBD)Efficient routing for enterprise femtocells (Effort: High)E-UTRAN interworking (Effort: Medium)Mobility Enhancements (Effort: High)Enhanced Interference Management (IM) Techniques (Effort: TBD)Note: Red: Included in CDG list. Blue: In addition included in TSG-S WI. Black: Additional WI.

source: qualcomm incorporated contact: peerapol tinnakornsrisuphap, jun wang, george cherian march...

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