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Multi-Carrier Strategy Training
HSDPA性能研究与华为解决方案汇报
Key feature
Cases
Strategy and Pros vs Cons
Evaluation
Introduction
2
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Introduction• Background:
Remark: Multi-carrier strategy also include multi-band situation, such as U900+U2100.
With the steady growth of radio services especially the data services, operators need to expand the capacity of the live network and add more carriers are one of the choices. Currently multi-band and multi-carrier networking has become a main scenario for lots of operator’s live networks.
According to the analysis of the operators requirements we classify them into two categories and they are Prefer system capacity and Prefer voice quality.
Deploying different strategies will meet different operator’s requirements in different scenarios
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• Strategy content:
CampingPolicy Mobility
Policy
AccessPolicy Load
BalancePolicy
StatusTransition
HSPA+
Multi-Carrier Strategy
Neighboring Cell Manage
AlgorithmSwitch
SPGSetting
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Access policy feature – DRD - Directed Retry Decision
• In RAN11.0 and earlier versions, DRD is implemented based on blind handover (that is, the cell signal quality
meets certain threshold, but not to measure the target cell).
• In RAN12.0, the original DRD algorithm implementation is kept, and measurement-based DRD algorithm is
added (that is, to measure signals of the target cell).
=> Improve the performance and successful of DRD access procedure, increase the delay
Measurement-based DRD or DRD of blind handover is based on parameters configuration and
currently measurement-based DRD is closed by default.
DRD Cells
Capability Matching between Cells and UE
Cell selection based on Service Steering
Cell selection based on Load
Step1: Generates a list of candidate DRD-supportive inter-frequency cells with RAB DRD Conditions
Step2: Get the Technical Priority of the DRD Cells by MIMO_64QAMorDC-HSDPA and MIMOor64QAM.
Step3: The HSDPA Steering Cell will be selected.
Step4: The DC Group will be decided by comparing the DL Loadbetween the DC Groups. And the Anchor Carrier will be selected based on the UL Load of the 2 carriers belonging to the DC Group.
Priority
Take DC service as an example
DRD: Directed Retry Decision
DRD feature For access
procedure
RAB Setup procedure Combine UE and cell Technology priority
If Technology Priority and Cell priority are same
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Load balance policy feature – LDR
When the usage of cell resource exceeds the basic congestion triggering threshold, the cell enters the basic congestion
state. In this case, Load Reshuffling (LDR) is required to reduce the cell load and increase the access success rate.
The RNC adopts the following behaviors until the congestion be removed:
– Inter-frequency load handover
– BE rate reduction
– CS/PS inter-RAT handover
– AMR rate reduction
– QoS Renegotiation for
Uncontrollable Real-Time Services
– code reshuffling
Resource
UL/DL Channel
LDR Actions
Inter-
Frequency Load
Handover
BE Rate
Reduction
Inter-RAT Handover in CS Domain
Inter-RAT Handover in PS Domain
AMR Rate
Reduction
QoS Renegotiat
ion for
Uncontrollable
Real-Time
Services
Code Reshuffling
Power
ULDCH √ √ √ √ √ √ HSUPA √ √
DL
DCH √ √ √ √ √* √ HSDPA √ √ DC-HSDPA √ √
IubUL
DCH √ √ √ HSUPA √
DLDCH √ √ √ HSDPA √
Code– –
DLDCH √ √ √HSDPA
CreditUL
DCH √ √ √ √ HSUPA √ √
DLDCH √ √ √ √ HSDPA
LDR actions intended for different
resources
Remarks:If the downlink power–based admission
uses the ENU algorithm, the basic
congestion can also be caused by the
ENU. In this situation, LDR actions do not
involve AMR rate reduction or MBMS
power reduction, as indicated by the
symbol “*” in the table.
LDR in connected mode
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UE Restriction( Refer to 3GPP 25.133)
– UE can only measure 2 inter-frequency only for both
idle mode and connected mode in 3G
– UE can only measure 3 inter-frequency 3G frequency
in GSM
More frequency => Many frequency was introduced in the network => but there UE restrictions according to 3GPP
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Strategy - Preferred Camping
1.Idle Users camp on F1 carrier
2.Through setting SPG, R99 directly establish on F1
3.Through setting SPG, H services establish on F2 preferentially
4.Allow intra-frequency handover based on coverage for all carriers
5.Configure blind handover neighboring cell between F1<-->F2
6.Allow bi-directional inter-freq HHO based on LDR between F1 and F2
7.Configure one way handover based on coverage from F2 to F1 but F1 to F2 are not allowed
R99+HSPA
R99+HSPA
R99+HSPA
HSPA+R99HSPA+R99
F1
F2
SHO
HHO
Blind HO
R99+HSPA
Camping
Load Balancing
Coverage HO
DRD (f1 => f2) and LDR (F1 <=> F2)
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Strategy - Random Camping
1.Idle User randomly camp on F1 or F2 carrier
2.R99 directly establish on each carrier that the user camp on
3.HSPA services DRD based on HSPA user number balanced
4.Allow intra-frequency handover based on coverage for all carriers
5.Configure blind handover neighboring cell between F1<-->F2
6.Allow bi-directional inter-freq HHO based on LDR between F1 and F2
7.Configure one way handover based on coverage from F2 to F1 but F1 to F2 are not allowed
R99+HSPA
R99+HSPA
R99+HSPA
R99+HSPAR99+HSP
AF1
F2
SHO
HHO
Blind HO
R99+HSPA
Camping
Every users can access to every carriers randomly depending on signal quality
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Resources on different carriers may not be used equally
Due to HSPA carrier’s high load as well as the DRD, the HSPA setup success ratio may be deteriorated
Resources on different carriers may not be used equally
Due to HSPA carrier’s high load as well as the DRD, the HSPA setup success ratio may be deteriorated
Strategy - Pros vs Cons
ConsCons
AMR and HSPA services are on the same carriers, the AMR KPI may be deteriorated
AMR and HSPA services are on the same carriers, the AMR KPI may be deteriorated
AMR and HSPA are separate on different carriers, the AMR experience will be guaranteed as much as possible
The AMR carrier load will be relatively low and the drive test for high signal quality and coverage will be guaranteed as much as possible
AMR and HSPA are separate on different carriers, the AMR experience will be guaranteed as much as possible
The AMR carrier load will be relatively low and the drive test for high signal quality and coverage will be guaranteed as much as possible AMR are basic service for WCDMA. Some operators pay special attention on AMR in order to
satisfy these requirement (Prefer voice quality), HW suggests to use “Preferred Camping Strategy”. As the rapid growing of data service, system capacity become much more important than ever before, in order to help operator to improve HSPA experience (Prefer system capacity) , HW suggests to use “Random Camping Strategy”
Co
nc
lus
ion
Co
nc
lus
ion
High system capacity, high carrier efficiency
Less DRD for HSPA, the HSPA RAB setup success ratio will be guaranteed as much as possible
As all carriers are used for HSPA, HSPA experience may be better
High system capacity, high carrier efficiency
Less DRD for HSPA, the HSPA RAB setup success ratio will be guaranteed as much as possible
As all carriers are used for HSPA, HSPA experience may be better
Preferred Camping
Random Campin
g
ProsPros
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HSDPA Strategy Evaluation– How to use tool
• Network audit tool Omstar Start UMTS_NetworkAudit
Choose items as below to analyze network strategy and corresponding
KPIs
• Refer to the following document to see how to use UMTS_NetworkAudit :
- 《 UMTS Network Evaluation Tool User Guide》 -
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Evaluation– OMSTAR Result to analysis
• According to the NodeB number,
provide Top10 Strategy and as well
as it’s pros and cons
• Provide KPI for each carrier
• Provide each NodeB’s strategy
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Case 1 – Strategy analysis using tool example(1)
• Conclusion:
• 94.2% NodeB deploy Random Camping Strategy
• 5.8% NodeB deploy Preferred Camping Strategy
• Why are there so many different strategy? Are they right?
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Case 1 – Strategy analysis using tool example(2)
• Remark: all the above KPIs are calculated by each cell
• Conclusion:
• F1/F2/F3/F4’s traffic are almost equal and this is reasonable for
Random Camping Strategy
• F5’s deployed in suburb and it’s traffic is lower than other carrier
• Why are there so many different strategy? Are they right?
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Case 2 – Strategy Adjust Example
1. In order to improve coverage and signal quality (voice quality) , operator x adjust it’s network strategy from random camping to preferred camping
2. As expected its drive signal quality improves 1.7% (EcNo>-12dB), AMR call drop rate reduces 0.05% but PS RAB setup success ratio deteriorates 0.46% and PS DL throughput reduces 7%
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HSPA+R99
HSPA+R99 HSPA+R99 HSPA+R99
HSPA+R99 HSPA+R99
Mobility Policy
Allow intra-frequency handover based on coverage for all
carriers(ADD UINTRAFREQNCELL) Configure one way handover based on coverage from F4 to
F3/F2 and from F3 to F2 (ADD UINTERFREQNCELL) Configure blind handover neighboring cell between F1<-->F2;
F1,F2-->F3; F1, F2-->F4 (ADD UINTERFREQNCELL :
BlindHOFlag=TRUE) Configure GSM as neighboring cell for all cells, only configure F1 and F2 as neighboring cell for GSM.
HSPA+R99
HSPA+R99
F1
F2
F3
F4
HSPA+R99
SHO
HHO
Blind HO
Requirement: Prefer System Capacity
Recommend Strategy: Random Camping
Case 3 – Strategy Configuration Example
Camping Policy Camp on F1 and F2 randomly
Access and Load Balance Policy All carriers support HSPA and R99 Non H service are directly established in the cell
where the UE camp on H service are established on F1/F2/F3/F4 through
load balance LDR policy set as default
HSPA+ Use F3 and F4 as DC dual carriers
Dual carrier Group
F4 : Non homogeneous carrier
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Case 4 – U900 and 5 Carriers Strategy(1)
G900
U900
G1800
U2100 F2
U2100 F4
U2100 F1 U2100 F1 U2100 F1
U2100 F2 U2100 F2
U900
Requirement: 1. U900 absorb weak coverage traffic 2. Prefer system capacity
U900
G900
G1800
G900
G1800
U2100 F3
DL10737
DL10713
DL10688
DL10663
DL3038
Suggestion: Random Camping Strategy and dedicated U900 strategy
Network Coverage:1. F1/F2/G900 full coverage2. U900,F3,F4 hotspot coverage
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Case 4 – U900 and 5 Carriers Strategy(2)Key Switches for idle / connection mode cell reselection, RAB DRD, Inter-frequency handover, Load reshuffling:
Parameter Value MML Command Parameter Description
SIB11Ind True/False ADD UINTERFREQNCELL
"FALSE" indicates that neighboring information are not included in the SIB11. "TRUE" indicates that neighboring information are included in the SIB11.
SIB12Ind True/False ADD UINTERFREQNCELL
"FALSE" indicates that neighboring information are not included in the SIB12. "TRUE" indicates that neighboring information are included in the SIB12
HOCovPrio 0/1/2/3 ADD UINTERFREQNCELL
"0" indicates that the coverage-based inter-frequency handover is not supported. (based on load) Eg. for Blind HO"1" indicates that the cell is assigned with the highest priority for the handover. "3" indicates that the cell is assigned with the lowest priority for the handover.
BlindHoFlag True/False ADD UINTERFREQNCELL
“FALSE” indicates that the cell is not considered as a candidate cell for blind handover.(HO based measurement)“TRUE” indicates that the cell can be considered as a candidate cell for blind handover
DrdOrLdrFlag True/Fals ADD UINTERFREQNCELL
"TRUE" indicates that the cell can be considered as the measurement object in the DRD measurement algorithm or LDR measurement algorithm. The value "FALSE" indicates that the cell is invalid.
DR_RAB_SING_DRD_SWITCH
ON/OFFSET
UCORRMALGOSWITCHDRD switch for single RAB
DR_RAB_COMB_DRD_SWITCH
ON/OFFSET
UCORRMALGOSWITCHDRD switch for combine RAB
UE in idle mode
UE in Con mode
Type of Inter-freq HO
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• UEs will camp on U2100 F1/F2, G900 and G1800 in idle mode (i.e. Access Layers).
• U900 set as “limited access layer” – UEs can reselect to U900 when coverage of U2100
F1/F2 is poor. Idle UEs on U900 will reselect to F1/F2 when within U2100 coverage area.
• U900 layer will be considered as the coverage layer for both CS and PS – only one way
for UE to go to this layer (from all U2100 layers) during Connected Mode is due to
coverage (i.e. Inter-Frequency HO).
• Coverage-based Inter-RAT from U2100 layers to G900 is for CS services only.
• Calls end on U2100 F3/4 will be forced to re-select to U2100 F1/F2, U900 or G900
immediately.
• F3 and F4 will be the Non-Access and HS-preferred layers – UEs will only perform HSPA
RAB DRD from F1 to co-sector F2/3/4 cells and from F2 to co-sector F1/3/4 cells.
• Combined 3G services will access at the current 3G cell, where the first service is being
served.
Case 4 – U900 and 5 Carriers Strategy(3)
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• LDR happens
1) between all U2100 layers (bi-directional blind Inter-Frequency HO)
2) from 3G to G900 and co-sector G1800 for CS services only (Inter-RAT - only as 4th
action for DL LDR).
• Measurement-Based LDR algorithm will be enabled from U900 to U2100 F1/2
(feature can only support 2 target frequencies according to 3GPP).
G900 / G1800 Layer :
• Re-selections to the G1800 layer is only possible via the G900 layer.
• Uni-directional traffic handovers are possible from G900 to G1800.
• UEs on G1800 can move to G900 in connected mode due to coverage.
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U2100 F1
Case 4 – U900 and 5 Carriers Strategy(4)IDLE MODE CONNECTED MODE
U2100 F4
U2100 F1
U2100 F2
G900
G1800
Reselection (bi-directional)Reselection (uni-directional)
U2100 F2
G900
G1800
U2100 F1
U2100 F3
Access Layer
Access Layer
Capacity/Non Access Layer
Access Layer
U2100 F3
U2100 F1
U2100 F2
Coverage-based (uni-directional)
Traffic -based (uni-directional)
HSPA RAB DRD (co-sector, bi and uni-directional)
Blind IFHO LDR (co-sector, bi and uni-directional)
CS Inter-RAT and LDR (to G900)
U2100 F1
U2100 F2
U2100 F4
U900 U900 U900 U900
Coverage-based CS & PS IFHO/ CS ISHO (uni-directional)
Measurement based LDR
Capacity/Non Access Layer
U2100 F1
CS LDR (to G900)
For LDR ,2 possibilities : -Blind HO or -Measurement based HO
Load balance layer
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Parameter U2100 F1 U2100 F2 U2100 F3 U2100 F4 U900
Cell Reselection
Qqualmin -18 dB -18 dB -18 dB -18 dB -18 dB
Qrxlevmin -58(-115dBm) -58(-115dBm) -58(-115dBm) -58(-115dBm) -58(-115dBm)
Qhyst2 1 (2dB) 1 (2dB) 1 (2dB) 1 (2dB) 1 (2dB)
IdleSintrasearch 5(10dB) 5(10dB) 5(10dB) 5(10dB) 5(10dB)
IdleSintersearch 4(8dB) 4(8dB) 127 (Off) 127 (Off) 127 (Off)
Inter-freq Neighbors
SIB11 IndTo U900/F2 - True To co-sector F3/4 –
False
To U900/F1 - True To co-sector F3/4 -
False
To U900/F1 - True To F2 and co-sector F4 -
False
To U900/F2 - True To F1 and co-sector F3
– False
To F1/F2 - True
IdleQoffset2 - inter (for ncells with SIB11 True)
0 dB –> U2100 F23 dB -> U900
0 dB –> U2100 F13 dB -> U900
-50 dB -> U2100 F1 3 dB –> U900
-50 dB -> U2100 F2 3 dB –> U900
-3 dB -> U2100 F1/2
Blind handover flag (for LDR and DRD)
Only True for co-sector U2100 cells
Only True for co-sector U2100 cells
Only True for co-sector U2100 cells
Only True for co-sector U2100 cells
None
HOCOVPRIOU900 - 2
co-sector F2/3/4 - 0U900 - 2
co-sector F1/3/4 - 0U900 and other F1 - 2co-sector F1/2/4 - 0
U900 and other F2 - 2co-sector F1/2/3 – 0
F1/F2 - 2
Case 4 – U900 and 5 Carriers Strategy(5)
Exemple : 3G cell with EcNo = -9 et RSCP = -106dB Squal = CPICH_EC/No – qQualMinSqual = -9 – (-18) = 9 > Sintrasearch = 5
If Squal > Sintrasearch, the UE need not start the intra-frequencymeasurement.If Squal ≤ Sintrasearch, the UE need to start the intra-frequency measurement.
(Idle mode)
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Parameter U2100 F1 U2100 F2 U2100 F3 U2100 F4 U900
Inter-freq Handover (only for your reference, pls. refer to the default value according each version)
CS 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm
CS 2F -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm
H 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm
H 2F -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm
Inter-RAT Handover (only for your reference, pls. refer to the default value according each version)
CS 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm
CS 2F -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm
H 2D -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm
H 2F -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm
Inter-Frequency and Inter-RAT Coexist Switch
SIMINTERFREQRAT SIMINTERFREQRAT SIMINTERFREQRAT SIMINTERFREQRAT INTERFREQ
CoexistMeasThdChoiceCOEXIST_MEAS_THD_CHOICE_INTERF
REQ
COEXIST_MEAS_THD_CHOICE_INTERF
REQ
COEXIST_MEAS_THD_CHOICE_INTERF
REQ
COEXIST_MEAS_THD_CHOICE_INTERF
REQ
COEXIST_MEAS_THD_CHOICE_INTE
RFREQ
Case 4 – U900 and 5 Carriers Strategy(6)
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Measurement based LDR for U900 cell: TargetFreqThdRscp: -92 dBm, TargetFreqThdEcN0: -12 dB
Parameter U2100 F1 U2100 F2 U2100 F3 U2100 F4 U900
DRD
Service Steering OFF OFF OFF OFF OFF
LdbDRDSwitchDCH OFF OFF OFF OFF OFF
LdbDRDSwitchHSDPA ON ON OFF OFF OFF
LdbDRDchoice UserNumber UserNumber UserNumber UserNumber UserNumber
H user balance Related
LdbDRDLoadRemainThdHSDPA 100(default) 100(default) 100(default) 100(default) 100(default)
MaxHsdpaUserNum 64(default) 64(default) 64(default) 64(default) 64(default)
LdbDRDOffsetHSDPA 1 -> Target blind HO cell will be considered as a DRD candidate when HS-DSCH load of source cell is greater than the
load of the target cell by 1% or more.
Case 4 – U900 and 5 Carriers Strategy(7)
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AppendixFeature Number Feature NameWRFD-020110 Multi Frequency Band Networking
WRFD-020160 Enhanced Multiband Management
WRFD-02040001 Intra System Direct Retry
WRFD-02040002 Inter System Direct Retry
WRFD-02040003 Inter System Redirect
WRFD-02040004 Traffic Steering and Load Sharing During RAB Setup
WRFD-020302 Inter Frequency Hard Handover Based on Coverage
WRFD-020103 Inter Frequency Load Balance
WRFD-021200 HCS (Hierarchical Cell Structure)
WRFD-020105 Potential User Control
WRFD-020402 Measurement Based Direct Retry
WRFD-020160 Enhanced Multiband ManagementFeature Number Feature NameWRFD-02040001 Intra System Direct Retry WRFD-02040002 Inter System Direct Retry WRFD-02040003 Inter System Redirect WRFD-02040004 Traffic Steering and Load Sharing During RAB SetupWRFD-020302 Inter Frequency Hard Handover Based on Coverage WRFD-020103 Inter Frequency Load Balance WRFD-021200 HCS (Hierarchical Cell Structure) WRFD-020105 Potential User ControlWRFD-02040001 Intra System Direct Retry WRFD-02040002 Inter System Direct Retry WRFD-02040003 Inter System Redirect WRFD-020402 Measurement Based Direct RetryFeature Number Feature NameWRFD-020303 Inter-RAT Handover Based on Coverage WRFD-020306 Inter-RAT Handover Based on Load WRFD-020305 Inter-RAT Handover Based on Service WRFD-020401 Inter-RAT Redirection Based on Distance
• 2G/3G inter-operation
• Multi-carrier relevant
features
• Multi-frequency relevant
features
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