Huawei Multi-Carrier Strategy Training

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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

HUAWEI TECHNOLOGIES CO., LTD. 华为机密材料，注意发放范围
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
274
389
621
911
1221
1501
• Strategy content：
Camping
Policy
Mobility
Policy
Access
Policy Load
Balance
Policy
Status
Transition
HSPA+
Multi-Carrier Strategy
Neighboring
Cell Manage
Algorithm
Switch
SPG
Setting

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 Load
between 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
RAN12

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-FrequencyLoad
Handover
BERateReduction
Inter-RATHandoverin
CSDomain
Inter-RATHandoverin
PSDomain
AMRRateReduction
QoSRenegotiationfor
UncontrollableReal-Time
Services
CodeReshuffling
Power
UL
DCH √ √ √ √ √ √
HSUPA √ √
DL
DCH √ √ √ √ √* √
HSDPA √ √
DC-HSDPA √ √
Iub
UL
DCH √ √ √
HSUPA √
DL
DCH √ √ √
HSDPA √
Code
– –
DL
DCH √ √ √
HSDPA
Credit
UL
DCH √ √ √ √
HSUPA √ √
DL
DCH √ √ √ √
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

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

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)

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+HSPA
F1
F2
SHO
HHO
Blind HO
R99+HSPA
Camping
Every users can access to every carriers randomly depending on signal quality

 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
Cons
 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 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”
Conclusion
 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
Camping
Pros

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》-

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

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?

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?

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%

HSPA+R99
HSPA+R99 HSPA+R99 HSPA+R99
HSPA+R99HSPA+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

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 coverage
2. U900,F3,F4 hotspot coverage

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/False 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_D
RD_SWITCH
ON/OFF
SET
UCORRMALGOSWITCH
DRD switch for single RAB
DR_RAB_COMB_D
RD_SWITCH
ON/OFF
SET
UCORRMALGOSWITCH
DRD switch for combine RAB
UE in idle mode
UE in Con mode
Type of Inter-freq HO

• 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.

• 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.

U2100 F1
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

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 Ind
To 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 F2
3 dB -> U900
0 dB –> U2100 F1
3 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
U2100 cells
U2100 cells
U2100 cells
None
HOCOVPRIO
U900 - 2
co-sector F2/3/4 - 0
U900 - 2
U900 and other F1 - 2
U900 and other F2 - 2
co-sector F1/2/3 – 0
F1/F2 - 2
Exemple :
3G cell with EcNo = -9 et RSCP = -106dB
Squal = CPICH_EC/No – qQualMin
Squal = -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)

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
CoexistMeasThdChoice
COEXIST_MEAS_TH
D_CHOICE_INTERF
REQ
COEXIST_MEAS_TH
D_CHOICE_INTERF
REQ
COEXIST_MEAS_TH
D_CHOICE_INTERF
REQ
COEXIST_MEAS_TH
D_CHOICE_INTERF
REQ
COEXIST_MEAS_T
HD_CHOICE_INTE
RFREQ

Measurement based LDR for U900 cell: TargetFreqThdRscp: -92 dBm, TargetFreqThdEcN0: -12 dB
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
LdbDRDLoadRemain
ThdHSDPA
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.

Appendix
Feature Number Feature Name
WRFD-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 Management
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-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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