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NEC’s proposals for LTE Advanced
NEC Corporation
7th, 8th April 2008
3GPP RAN IMT-Advanced
Workshop
REV-080022
© NEC Corporation 2007 2
Introduction
In REV-080021, NEC’s view on requirements of LTE Advanced have been
shown
Following technical features are focused here to meet part of these
requirements
 Proposal 1 : Adaptive Uplink Multiple Access
 To be optimized for wider system bandwidth
 To achieve good trade-off between cell throughput and cell coverage
 Proposal 2 : Advanced SON solutions for radio optimization
 To reduce the human oriented manual operations for lowering Cost of
Ownership (CAPEX and also OPEX)
 To allow “Always on RAN performance monitoring” for maintaining better
RAN performance
 Proposal 3 : Advanced RRM solutions for full scale femto deployments
 To reduce the impact on macro-femto and femto-femto interference.
© NEC Corporation 2007 3
LTE-Advanced Feature Proposal 1:
Adaptive Uplink Multiple Access
© NEC Corporation 2007 4
Background
In LTE Advanced, system bandwidth can be much wider than that in LTE
(ex. 100MHz for DL and 50MHz for UL in maximum)
 Higher frequency selectivity
 Severer power limited condition
Under these conditions, system should be optimized with considering the
trade-off between cell throughput and cell coverage
Proposal: Adaptive uplink multiple access
 DFT-s-OFDM with Spectrum Division Control
 Adaptive selection of DFT-s-OFDM and OFDM
f f
Proposal 1
UE UE
© NEC Corporation 2007 5
DFT-s-OFDM with SDC
• DFT-s-OFDM can generate both single carrier signal and multi-carrier
signal
• LTE adopts single carrier generation only currently to achieve the lowest
PAPR Restriction in resource allocation
Cell throughput can be maximized by controlling SD (Spectrum Division)
considering trade-off between PAPR and resource allocation flexibility
+CP
f
f
SC-FDMA(SD=1)
MC-FDMA(SD=4)
IFFT
DFT
Data Sub-carrier
mapping
Proposal 1
© NEC Corporation 2007 6
4
5
6
7
8
9
10
10 100 1000
Number of subcarriers
PAPR
(dB)
@CCDF=10
-
4
• PAPR increases gradually as SD (Spectrum Division) is getting
larger.
• We can find UE-specific SD to satisfy different PAPR requirement.
PAPR of DFT-s-OFDM with SDC
DFT-s-OFDM
OFDM
f
f
SD=4
SD=2
QPSK
f
SD=1 (SC-FDMA)
Proposal 1
© NEC Corporation 2007 7
DFT-s-OFDM with UE-specific SDC
• Spectrum Division (SD): Number of discontinuous resource block
(RB) groups
• UE-specific SD: CQI-based SD for different UE
– High throughput of cell-center users
– Low PAPR of cell-edge users
f
f
SC-FDMA
DFT-s-OFDM
w/ SDC
SD
CQI Level
4
2
1
UE3 UE2 UE1
Low PAPR
Flexible
resource
allocation
Proposal 1
UE1
UE2
UE3
© NEC Corporation 2007 8
Adaptive selection of DFT-s-OFDM / OFDM
Base Station selects DFT-s-OFDM or OFDM depending on the cell size
For Macro cell: DFT-s-OFDM (Wide coverage with low PAPR)
For Micro/Femto cell: OFDM (Higher Peak Rate with MIMO)
Additional use of OFDM in cell center of Macro cell gives extra gain
⇒ UE specific(Hybrid)use of DFT-s-OFDM and OFDM could be applicable
Femto/Micro Cell:
OFDM
Macro Cell:
DFT-s-OFDM
On either cell specific or UE specific,
tradeoff in Complexity and Throughput must be considered
Cell
Specific
UE Specific
(Hybrid)
Femto/Micro Cell:
OFDM
Macro Cell:
DFT-s-OFDM /
OFDM
Proposal 1
OFDM
DFT-s-OFDM
© NEC Corporation 2007 9
Summary
The followings have been proposed for LTE+ uplink access scheme to
achieve good trade-off between cell throughput and cell coverage
 DFT-s-OFDM with SDC (Spectrum Division Control)
Throughput optimization by CQI-based Spectrum Division for different
UE
 Lower SD for power limited UEs to achieve lower PAPR
 Higher SD for non-power limited UEs to achieve higher scheduling
flexibility
 Adaptive selection between DFT-s-OFDM and OFDM
Cell specific selection
 OFDM for small cell to maximize MIMO gain
 DFT-s-OFDM for large cell to maximize coverage
UE specific selection
- Higher gain than cell specific one is expected, but actual gain
should be investigated
- Increase of complexity by introducing UE specific adaptation should
be carefully investigated
Proposal 1
© NEC Corporation 2007 10
NEC Confidential
LTE-Advanced Feature Proposal 2:
Advanced SON solutions
for radio optimization = SONv2
© NEC Corporation 2007 11
Introduction:
Self-X Radio Access Network
• Self-X RAN == More Intelligent RAN
– Self Organizing based on PnP behavior
– Self Optimizing based on always on monitoring
– Self Coordinating based on distributed decision
– Self Healing based on detection/reporting
– …
• Why Self X Technologies?
– Reduce the human oriented manual operations.
• Lowering Cost of Ownership (CAPEX and also OPEX)
– “Always on RAN performance monitoring”
• Maintaining better RAN performance
Proposal 2
© NEC Corporation 2007 12
 SON related Agreements in Release 8
 Global Cell ID and Automatic Neighbor Search
 Building up neighboring cell list
 ANR mechanism allows detection of missing neighbour relation
=> automatic optimization of the neighboring cell list
 eNB measurements
 RACH access, DL/UL throughputs, RB utilizations
 UE measurements
 Detected cells, Global cell ID
 SON features in Release 8 provide a good starting point and more SON
features are needed for LTE advanced systems.
 LTE advanced should focus not only on L1 speed but also more
advanced SON mechanisms
Release 8 SON Features
Proposal 2
© NEC Corporation 2007 13
Example 1:
Self-deployment of eNodeBs
• More autonomous deployment becomes obviously more interesting
– Without planning of radio parameters
– Also useful study item for home NodeB deployment
• Start with minimal coverage and gradually increase cell size
• Radio scanning to find unused resources
• Negotiation with neighbor cells about spectrum resource usage
Resource negotiations
Proposal 2
© NEC Corporation 2007 14
Example 2:
Self Neighbor Scanning HeNB
• Operator will have many thousands/millions of home eNB.
– Human operation based configuration of each hEB is not economical.
• Home eNB frequently scan
– All neighbors of own or other PLMN ID
• heNB capable of scanning neighboring macro cells/frequencies
– All neighbors of other RAT
• heNB capable of scanning neighboring UMTS/WIMAX cells
– Scan results are sent to the central server
Proposal 2
© NEC Corporation 2007 15
Example 3:
Self Coordinating Interference Management
time
frequency
Slots that are not
to be used for high
power transmission
in blue cell
• To coordinate scheduling in interfering cells,
– Alt1: Semi-static restrictions for users close to cell borders
• Self coordination between cells set by rules
• Agreed in Release 8 as HII
– Alt2: Short time-scale coordination
• Very high speed of coordination for re-optimization based on load in different cells
X2 based
Standardized RRM
Procedures
Proposal 2
© NEC Corporation 2007 16
Example 4: HO Parameterization Optimization
• Handover parameter optimization triggered by “performance
problems”
• Optimization of individual neighbor-to-neighbor parameters
– E.g. HO hysterisis control
• Slow optimization loop
– Cautiously change parameter to avoid user perceivable degradation
– Evaluate results through performance monitoring
Reporting of Radio Link Failure
with Location
Proposal 2
© NEC Corporation 2007 17
Example 5: UE Measured Performance Reporting
• Real performance based UE’s reporting of poor user experiences
– For example, very low throughput reporting (below 64kbps at location X,Y)
• Problem analysis
– Drawing the real performance map over X days or Y weeks.
• RAN parameters
– Antenna tilt, TX power, Scheduler parameters, …
• Slow optimization loop
– Cautiously change RAN parameters to avoid user perceivable degradation
Reporting of Very Low Throughput
with Location Info
Proposal 2
© NEC Corporation 2007 18
Example 6:
Common Channel Self Optimization
RACH, PCH, BCH Power optimizations
• Instead of drive tests: slow optimization based on UE reports
– received signal strength, channel quality, neighbor signal strength
– Ideally also location of UE
• Cautious adjustment of power in one cell, monitoring of effects
– search optimal settings, e.g. gradient descent
Proposal 2
© NEC Corporation 2007 19
Example 7: Reduction of
Energy Consumption by RAN
• Partial or complete eNB power down during low load, e.g. at night
• Stored profiles used to reconfigure radio parameters for the new topology
• Wake up based on timers or external triggers
• Question: would operators be interested in solutions that close down an
eNB?
Proposal 2
© NEC Corporation 2007 20
Summary of Proposal 2:
SONv2 for LTE Advanced
• 7 examples of SONv2 are presented that can reduce
the cost of ownership of LTE advanced system.
• Clear work split between RAN and SA groups
– i.e. RAN related parameters & mechanisms to be
handled by RAN groups.
Self Deployable Cell
HO failure reporting
with location info
Automatic Common
Channel Power Control
Very low throughput
reporting with location info.
Configuration
profiles
O&M
Measurement
data
Always on RAN
performance monitoring
based on BTS and MS
reporting.
Proposal 2
© NEC Corporation 2007 21
LTE-Advanced Feature Proposal 3:
Several Issues and Challenges
for the Future Full Scale Femto Deployment
© NEC Corporation 2007 22
Advantages in Femto cell
deployment in a Radio Aspect
• Providing very high throughput for indoor users
• Extending indoor coverage
• Increasing radio capacity in an outdoor and indoor environment
Macro NodeB
Outdoor UE Indoor UE
Macro NodeB
Home NodeB
Outdoor UE Indoor UE
Before introducing femto Cells
After introducing femto Cells
0
200
400
600
800
1000
1200
1400
1600
1800
2000
0 400 800 1200 1600 2000
システムスループット [kbps]
ユーザスループット
[kbps]
Indoor
1Mbps
Before introducing
femto cells
Cell Throughput
HSDPA
User
Throughput
After
introducing
femto cells
Outdoor
Example: User throughput of HSDPA
(Category6) at 1 Mbps of cell throughput will
increase by 1.3 and 2.3 times in an outdoor
and indoor environment respectively.
Proposal 3
© NEC Corporation 2007 23
Macro NodeB
Femto NodeB
Macro UE
Femto UE
Desired signal
3. DL interference from
Macro NodeB to Femto UE
1. DL interference
from Femto NodeB
to Macro UE
4. UL interference from
Femto UE to Macro
NodeB
2. UL interference
from Macro UE to
Femto NodeB
5. DL interference from
Femto NodeB to Femto
UE in another femto cell
6. UL interference from
Femto UE to Femto NodeB
in another femto cell
Desired
signal
Interference Scenarios
The impact of interference will depend on the following:
• Radio frequency (same as or different from that of macro NodeBs)
• Maximum or CPICH transmission power of Home NodeB (fixed or adaptive)
• Indoor environment condition
• The number of Home NodeBs per macro cell
• Access to Home NodeBs (open or closed)
There are 6 interference scenarios between macro and femto cells or
among femto cells, which may minimize the femto cell advangtages.
Proposal 3
© NEC Corporation 2007 24
RF Selection
• Purpose:
 To avoid the mutual interference between femto cells and macro
or micro cells
• Solution:
 RF is selected for Home NodeBs based on CPICH RSCP
measured at Home NodeBs and cell information such as HCS or
CPICH Tx Power.
• If there is a RF whose CPICH RSCP is below a certain level,
then a femto cell selects that RF
• Oherwise, a femto cell selects RF which has lowest HCS or
largest CPICH Tx Power.
Macro Cell : RF1
Micro Cell : RF2
Conventional:
RF2 is selected because of
lower CPICH RSCP, leading
to increasing the interference.
Proposal:
RF1 is selected because of
lower HCS, leading to
avoiding the interference.
Assumptions at this example:
-Femto cell is in a micro cell
-CPICH RSCP: RF1 > RF2
-HCS: RF1 < RF2
- (CPICH Tx Power: RF1 > RF2 )
Proposal 3
© NEC Corporation 2007 25
Technical challenges
to solve the interference issues
• Home NodeBs are required to function as minimizing the
interference in the self-organizing way.
• For example, the following technical solutions to minimize the
interference between macro and femto cells ( from 1 to 4 at the
previous page) can be considered.
 RF selection for femto cell
 Maximum or CPICH transmission power control of femto cell
considering indoor environment conditions
Proposal 3
© NEC Corporation 2007 26
Summary
• RF-related technical subjects and the interference mitigation
scenarios for 3G Home NodeB are described.
• It is necessary to study techniques for minimizing the interference
which can cause the degradation of indoor coverage or radio
capacity of macro or femto cells.
Proposal 3
© NEC Corporation 2007 27

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LteA_Pres_0804_NEC.ppt

  • 1. NEC’s proposals for LTE Advanced NEC Corporation 7th, 8th April 2008 3GPP RAN IMT-Advanced Workshop REV-080022
  • 2. © NEC Corporation 2007 2 Introduction In REV-080021, NEC’s view on requirements of LTE Advanced have been shown Following technical features are focused here to meet part of these requirements  Proposal 1 : Adaptive Uplink Multiple Access  To be optimized for wider system bandwidth  To achieve good trade-off between cell throughput and cell coverage  Proposal 2 : Advanced SON solutions for radio optimization  To reduce the human oriented manual operations for lowering Cost of Ownership (CAPEX and also OPEX)  To allow “Always on RAN performance monitoring” for maintaining better RAN performance  Proposal 3 : Advanced RRM solutions for full scale femto deployments  To reduce the impact on macro-femto and femto-femto interference.
  • 3. © NEC Corporation 2007 3 LTE-Advanced Feature Proposal 1: Adaptive Uplink Multiple Access
  • 4. © NEC Corporation 2007 4 Background In LTE Advanced, system bandwidth can be much wider than that in LTE (ex. 100MHz for DL and 50MHz for UL in maximum)  Higher frequency selectivity  Severer power limited condition Under these conditions, system should be optimized with considering the trade-off between cell throughput and cell coverage Proposal: Adaptive uplink multiple access  DFT-s-OFDM with Spectrum Division Control  Adaptive selection of DFT-s-OFDM and OFDM f f Proposal 1 UE UE
  • 5. © NEC Corporation 2007 5 DFT-s-OFDM with SDC • DFT-s-OFDM can generate both single carrier signal and multi-carrier signal • LTE adopts single carrier generation only currently to achieve the lowest PAPR Restriction in resource allocation Cell throughput can be maximized by controlling SD (Spectrum Division) considering trade-off between PAPR and resource allocation flexibility +CP f f SC-FDMA(SD=1) MC-FDMA(SD=4) IFFT DFT Data Sub-carrier mapping Proposal 1
  • 6. © NEC Corporation 2007 6 4 5 6 7 8 9 10 10 100 1000 Number of subcarriers PAPR (dB) @CCDF=10 - 4 • PAPR increases gradually as SD (Spectrum Division) is getting larger. • We can find UE-specific SD to satisfy different PAPR requirement. PAPR of DFT-s-OFDM with SDC DFT-s-OFDM OFDM f f SD=4 SD=2 QPSK f SD=1 (SC-FDMA) Proposal 1
  • 7. © NEC Corporation 2007 7 DFT-s-OFDM with UE-specific SDC • Spectrum Division (SD): Number of discontinuous resource block (RB) groups • UE-specific SD: CQI-based SD for different UE – High throughput of cell-center users – Low PAPR of cell-edge users f f SC-FDMA DFT-s-OFDM w/ SDC SD CQI Level 4 2 1 UE3 UE2 UE1 Low PAPR Flexible resource allocation Proposal 1 UE1 UE2 UE3
  • 8. © NEC Corporation 2007 8 Adaptive selection of DFT-s-OFDM / OFDM Base Station selects DFT-s-OFDM or OFDM depending on the cell size For Macro cell: DFT-s-OFDM (Wide coverage with low PAPR) For Micro/Femto cell: OFDM (Higher Peak Rate with MIMO) Additional use of OFDM in cell center of Macro cell gives extra gain ⇒ UE specific(Hybrid)use of DFT-s-OFDM and OFDM could be applicable Femto/Micro Cell: OFDM Macro Cell: DFT-s-OFDM On either cell specific or UE specific, tradeoff in Complexity and Throughput must be considered Cell Specific UE Specific (Hybrid) Femto/Micro Cell: OFDM Macro Cell: DFT-s-OFDM / OFDM Proposal 1 OFDM DFT-s-OFDM
  • 9. © NEC Corporation 2007 9 Summary The followings have been proposed for LTE+ uplink access scheme to achieve good trade-off between cell throughput and cell coverage  DFT-s-OFDM with SDC (Spectrum Division Control) Throughput optimization by CQI-based Spectrum Division for different UE  Lower SD for power limited UEs to achieve lower PAPR  Higher SD for non-power limited UEs to achieve higher scheduling flexibility  Adaptive selection between DFT-s-OFDM and OFDM Cell specific selection  OFDM for small cell to maximize MIMO gain  DFT-s-OFDM for large cell to maximize coverage UE specific selection - Higher gain than cell specific one is expected, but actual gain should be investigated - Increase of complexity by introducing UE specific adaptation should be carefully investigated Proposal 1
  • 10. © NEC Corporation 2007 10 NEC Confidential LTE-Advanced Feature Proposal 2: Advanced SON solutions for radio optimization = SONv2
  • 11. © NEC Corporation 2007 11 Introduction: Self-X Radio Access Network • Self-X RAN == More Intelligent RAN – Self Organizing based on PnP behavior – Self Optimizing based on always on monitoring – Self Coordinating based on distributed decision – Self Healing based on detection/reporting – … • Why Self X Technologies? – Reduce the human oriented manual operations. • Lowering Cost of Ownership (CAPEX and also OPEX) – “Always on RAN performance monitoring” • Maintaining better RAN performance Proposal 2
  • 12. © NEC Corporation 2007 12  SON related Agreements in Release 8  Global Cell ID and Automatic Neighbor Search  Building up neighboring cell list  ANR mechanism allows detection of missing neighbour relation => automatic optimization of the neighboring cell list  eNB measurements  RACH access, DL/UL throughputs, RB utilizations  UE measurements  Detected cells, Global cell ID  SON features in Release 8 provide a good starting point and more SON features are needed for LTE advanced systems.  LTE advanced should focus not only on L1 speed but also more advanced SON mechanisms Release 8 SON Features Proposal 2
  • 13. © NEC Corporation 2007 13 Example 1: Self-deployment of eNodeBs • More autonomous deployment becomes obviously more interesting – Without planning of radio parameters – Also useful study item for home NodeB deployment • Start with minimal coverage and gradually increase cell size • Radio scanning to find unused resources • Negotiation with neighbor cells about spectrum resource usage Resource negotiations Proposal 2
  • 14. © NEC Corporation 2007 14 Example 2: Self Neighbor Scanning HeNB • Operator will have many thousands/millions of home eNB. – Human operation based configuration of each hEB is not economical. • Home eNB frequently scan – All neighbors of own or other PLMN ID • heNB capable of scanning neighboring macro cells/frequencies – All neighbors of other RAT • heNB capable of scanning neighboring UMTS/WIMAX cells – Scan results are sent to the central server Proposal 2
  • 15. © NEC Corporation 2007 15 Example 3: Self Coordinating Interference Management time frequency Slots that are not to be used for high power transmission in blue cell • To coordinate scheduling in interfering cells, – Alt1: Semi-static restrictions for users close to cell borders • Self coordination between cells set by rules • Agreed in Release 8 as HII – Alt2: Short time-scale coordination • Very high speed of coordination for re-optimization based on load in different cells X2 based Standardized RRM Procedures Proposal 2
  • 16. © NEC Corporation 2007 16 Example 4: HO Parameterization Optimization • Handover parameter optimization triggered by “performance problems” • Optimization of individual neighbor-to-neighbor parameters – E.g. HO hysterisis control • Slow optimization loop – Cautiously change parameter to avoid user perceivable degradation – Evaluate results through performance monitoring Reporting of Radio Link Failure with Location Proposal 2
  • 17. © NEC Corporation 2007 17 Example 5: UE Measured Performance Reporting • Real performance based UE’s reporting of poor user experiences – For example, very low throughput reporting (below 64kbps at location X,Y) • Problem analysis – Drawing the real performance map over X days or Y weeks. • RAN parameters – Antenna tilt, TX power, Scheduler parameters, … • Slow optimization loop – Cautiously change RAN parameters to avoid user perceivable degradation Reporting of Very Low Throughput with Location Info Proposal 2
  • 18. © NEC Corporation 2007 18 Example 6: Common Channel Self Optimization RACH, PCH, BCH Power optimizations • Instead of drive tests: slow optimization based on UE reports – received signal strength, channel quality, neighbor signal strength – Ideally also location of UE • Cautious adjustment of power in one cell, monitoring of effects – search optimal settings, e.g. gradient descent Proposal 2
  • 19. © NEC Corporation 2007 19 Example 7: Reduction of Energy Consumption by RAN • Partial or complete eNB power down during low load, e.g. at night • Stored profiles used to reconfigure radio parameters for the new topology • Wake up based on timers or external triggers • Question: would operators be interested in solutions that close down an eNB? Proposal 2
  • 20. © NEC Corporation 2007 20 Summary of Proposal 2: SONv2 for LTE Advanced • 7 examples of SONv2 are presented that can reduce the cost of ownership of LTE advanced system. • Clear work split between RAN and SA groups – i.e. RAN related parameters & mechanisms to be handled by RAN groups. Self Deployable Cell HO failure reporting with location info Automatic Common Channel Power Control Very low throughput reporting with location info. Configuration profiles O&M Measurement data Always on RAN performance monitoring based on BTS and MS reporting. Proposal 2
  • 21. © NEC Corporation 2007 21 LTE-Advanced Feature Proposal 3: Several Issues and Challenges for the Future Full Scale Femto Deployment
  • 22. © NEC Corporation 2007 22 Advantages in Femto cell deployment in a Radio Aspect • Providing very high throughput for indoor users • Extending indoor coverage • Increasing radio capacity in an outdoor and indoor environment Macro NodeB Outdoor UE Indoor UE Macro NodeB Home NodeB Outdoor UE Indoor UE Before introducing femto Cells After introducing femto Cells 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 400 800 1200 1600 2000 システムスループット [kbps] ユーザスループット [kbps] Indoor 1Mbps Before introducing femto cells Cell Throughput HSDPA User Throughput After introducing femto cells Outdoor Example: User throughput of HSDPA (Category6) at 1 Mbps of cell throughput will increase by 1.3 and 2.3 times in an outdoor and indoor environment respectively. Proposal 3
  • 23. © NEC Corporation 2007 23 Macro NodeB Femto NodeB Macro UE Femto UE Desired signal 3. DL interference from Macro NodeB to Femto UE 1. DL interference from Femto NodeB to Macro UE 4. UL interference from Femto UE to Macro NodeB 2. UL interference from Macro UE to Femto NodeB 5. DL interference from Femto NodeB to Femto UE in another femto cell 6. UL interference from Femto UE to Femto NodeB in another femto cell Desired signal Interference Scenarios The impact of interference will depend on the following: • Radio frequency (same as or different from that of macro NodeBs) • Maximum or CPICH transmission power of Home NodeB (fixed or adaptive) • Indoor environment condition • The number of Home NodeBs per macro cell • Access to Home NodeBs (open or closed) There are 6 interference scenarios between macro and femto cells or among femto cells, which may minimize the femto cell advangtages. Proposal 3
  • 24. © NEC Corporation 2007 24 RF Selection • Purpose:  To avoid the mutual interference between femto cells and macro or micro cells • Solution:  RF is selected for Home NodeBs based on CPICH RSCP measured at Home NodeBs and cell information such as HCS or CPICH Tx Power. • If there is a RF whose CPICH RSCP is below a certain level, then a femto cell selects that RF • Oherwise, a femto cell selects RF which has lowest HCS or largest CPICH Tx Power. Macro Cell : RF1 Micro Cell : RF2 Conventional: RF2 is selected because of lower CPICH RSCP, leading to increasing the interference. Proposal: RF1 is selected because of lower HCS, leading to avoiding the interference. Assumptions at this example: -Femto cell is in a micro cell -CPICH RSCP: RF1 > RF2 -HCS: RF1 < RF2 - (CPICH Tx Power: RF1 > RF2 ) Proposal 3
  • 25. © NEC Corporation 2007 25 Technical challenges to solve the interference issues • Home NodeBs are required to function as minimizing the interference in the self-organizing way. • For example, the following technical solutions to minimize the interference between macro and femto cells ( from 1 to 4 at the previous page) can be considered.  RF selection for femto cell  Maximum or CPICH transmission power control of femto cell considering indoor environment conditions Proposal 3
  • 26. © NEC Corporation 2007 26 Summary • RF-related technical subjects and the interference mitigation scenarios for 3G Home NodeB are described. • It is necessary to study techniques for minimizing the interference which can cause the degradation of indoor coverage or radio capacity of macro or femto cells. Proposal 3