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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Huawei RAN12.0DC-HSDPA
Feature Presentation
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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
Upon completion of this course, you will be able to
understand:
Working principle of DC-HSDPA
Radio Resource Management of DC-HSDPA
Implementation of DC-HSDPA in Huawei RAN12
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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Basic Principle of DC-HSDPA
2. Radio Resource Management of DC-HSDPA
3. Implementation of DC-HSDPA
4. The Performance of DC-HSDPA
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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
DC-HSDPA
DC-HSDPA is introduced in 3GPP Release 8
DC-HSDPA allows a UE to set up HSDPA connections with two
inter-frequency time-synchronous cells that have the same
coverage
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DC-HSDPA
Advantages:
DC-HSDPA improves the end usersthroughput in the whole
cell area even in the cell edges
No negative impacts on the legacy HSDPA users and terminals.
If transceiver elements (RRU) support multi carrier technology
then no additional hardware will be required for network
upgrade to DC-HSDPA
The evolution from the HSPA to DC-HSPA is easy and
economical compared to MIMO upgrade
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DC-HSDPA Basic Concepts
Primary cell( also called anchor cell )
a carrier that carries all the channels of a UE, including UL
dedicated channels
Secondary cell ( also called supplementary cell )
a carrier that carries only three types of DL channel of a UE
HS-SCCH, HS-PDSCH & P-CPICH
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Cell Structure and Working Principle
One of the two cells is treated as Anchor (primary) Cell and
the other one as Supplementary (secondary) cell and both
of them can be deployed with Equivalent and Non-
equivalent channel configuration.
RAN12 not supported RAN12 supported
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Cell Structure and Working Principle
Equivalent Mode Non Equivalent Mode
Advantage
1. Both the cells can work as
anchor and supplementary
cells for DC users.
2. Both the cells will work as
an independent single cell
source for the non-DC-HSDPA subscribers or
legacy HSDPA subscribers
The supplementary cell's power will be
saved and contribute to the cell
throughput.
Disadvant
age
The supplementary cell willcost more DL power since
some of the common
channels are not be switch off.
1. The anchor cell cannot be changed.
2. If the supplementary cell is configured
with one HS-DSCH and a P-CPICH
(3GPP did not give the actualrequirements about the common
channels' configuration of
supplementary cell), the
supplementary cell cannot serve
traditional HSDPA, HSUPA and R99
users.
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Cell Structure and Restriction
The Timing of the two cells remains the same ( defined by parameterTcel l )
The ACK/NACK/CQI for 2 Carriers will be Joint-encoded and reported by HS-
DPCCH in Anchor Cell
DC-HSDPA+MIMO is not implemented within 3GPP R8 standards, but the sectorcan support DC and MIMO simultaneously
The two cells must belong to the same Node-B and are on adjacent carriers in the
same frequency band
The UE will only communicate with one cell (Anchor Carrier) in the uplink
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New UE categories for DC-HSDPA
HS-DSCH
category
Maximum
number of
HS-
DSCH
codes
received
Minimu
m inter-
TTI
interval
Maximum number of
bits of an HS-DSCH
transport block
received within an
HS-DSCH TTI
Total
number of
soft channel
bits
Supported
modulations
with dual cell
operation
Category 21 15 1 23370 345600 QPSK,16QA
M
Category 22 15 1 27952 345600 QPSK,16QA
M
Category 23 15 1 35280 518400 QPSK,16QA
M,64QAM
Category 24 15 1 42192 518400 QPSK,16QA
M,64QAM
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Contents
1. Basic Principle of DC-HSDPA
2. Radio Resource Management of DC-HSDPA
3. Implementation of DC-HSDPA
4. The Performance of DC-HSDPA
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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
DC-HSDPA Mapping
DC-HSDPA is unavailable for CS, IMS Signaling, SRB and PS conversational
Parameter (PS_STREAMING_ON_HSDPA_SWITCH) are available to disable
Streaming mapping onto HS-DSCH
For BE & Streaming, bit rate thresholds (DL streaming threshold on HSDPA , DL
BE traffic threshold on HSDPA) are provided
RABs with the maximum bit rate higher than or equal to the threshold will be
mapped onto HSDPA.
RNC Parameter (MIMO_64QAMorDC-HSDPA) will be used to decide the priority of
DC and MIMO
IMS Signaling
BE
Streaming
Mapping
RB on SC-HSDPAPS Conversational
RB on DC-HSDPASRB
CS
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DC-HSDPA Mapping
Parameter Default Value
PS_STREAMING_ON_HSDPA_SWITC
H ON
DL streaming threshold on HSDPA 64Kbps
DL BE traffic threshold on HSDPA 64Kbps
MIMO_64QAMorDC-HSDPA Depending on Operator
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Step2:Get the Technical Priority of the DRD Cells by
MIMO_64QAMorDC-HSDPAand MIMOor64QAM
Page14
Step1:Generates a list of candidate DRD-supportive
inter-frequency cells with RAB DRD Conditions
DC-HSDPA Anchor Carrier Selection by DRD
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Step3:The HSDPA Steering Cell will be selected
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DC-HSDPA Anchor Carrier Selection by DRD
(cont.)
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Step4:The DC Groupwill be decided by comparing the DL
Loadbetween the DC GroupsAnd the Anchor Carrier will be selected based on the UL Load
of the 2 carriers belonging to the DC Group
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DC-HSDPA Anchor Carrier Selection by DRD
(cont.)
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Call Admission Control of DC-HSDPA DL Load CAC
Code, CE, Iub CAC: Same as New SC-HSDPA user
User license: 1 DC UE will cost 1 user licenses in only primary cell
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( P1+P2 )
( P2+P3 )
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Mobility of DC-HSDPA
UL RL
DL Anchor Carrier
DL Supplementary
Carrier
UE Move
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Scenario 1:UE move in the DC continuous coverage areas
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Mobility of DC-HSDPA
UL RL
DL Anchor Carrier
DL Supplementary
Carrier
UE Move
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Scenario 2:UE move from DC areas to the Non-DC areas
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Mobility of DC-HSDPA
UL RL
DL Anchor Carrier
DL Supplementary
Carrier
UE Move
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Scenario 3:UE move from Non-DC areas to the DC areas
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Scheduling of DC-HSDPA
Scheduling targets:
Target 1: Enhance the QoS, Reduce the Delay-Sensitive
Serviceswaiting time and Guarantee the BEs throughput
Target2: Make full use of the resources of DC-Group
Target3: Realize the User-Differentiation among DC and SC
users, as well as between DC and SC users
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Scheduling of DC-HSDPA
Scheduling principles of Cells:
Principle 1: The power utilization of Carriers
Principle 2: SC-HSDPA user number of Carriers
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Scheduling Priority
Scheduling Priority in F1:
SC HSDPA User:
DC-HSDPA User:
Scheduling Priority in F2:
SC HSDPA User:
DC-HSDPA User:
))(
),((Pr
1
1max
tr
tfRFUNCiority
))()(),((Pr
21
1ma x
trtrtfRFUNCiority
)
)(
),((Pr
2
2max
tr
tfRFUNCiority
))()(
),((Pr
21
2max
trtr
tfRFUNCiority
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DC-Scheduling Example 1
UE A
Cell A: F1
Cell B: F2
UE B
UE C UE D UE E
2ms TTI
Scheduling sequence based on User
priorities on each TTI. For DC UE, the
r1(t) and r2(t) shall be take into account
together (refer the SchedulingPriority) .
DC Priority:
And the 2 sequences (belong to 2 Cells)
are independent.
))()(
),((Pr
21
1max
trtr
tfRFUNCiority
Cell A: F1
Cell B: F2
In this TTI, onlyCell A transfer
the data to UE A
In this TTI, both Cell A&B transfer
the data to UE A. If the buffered datais smaller than the Uu capability, the
following principles will be used to
select the Carrier to transfer the data.
(refer the Scheduling of DC-HSDPA)
In this TTI, onlyCell B transfer
the data to UE A
UE C UE C UE E UE A UE E UE E UE D UE A
UE A UE B UE B UE A UE B UE B UE B UE B
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Primary
(Cell 1)
Secondary
(Cell 2)
Conditions and Assumptions
Total UE number 2
SC-HSDPA UE
number
1 in Cell 1
DC-HSDPA UE
number1
DC-HSDPA UE
categoryCat 24
SC-HSDPA UE
category
Cat 14
User locat ionThe two users in
the same location.
SC User
DC
User
Expected Scheduling Results
SC-HSDPA UESC-HSDPA is served by Cell
1
DC-HSDPA UEDC-HSDPA is mainly served
by Cell 2 only
Throughp ut rat io
(SC vs. DC User)Approximately 1:1
Scheduling Example 2
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Primary
(Cell 1)
Secondary
(Cell 2)
SC1 User
DC
User
Expected Scheduling Results
SC-HSDPA UESC-HSDPA is served by Cell 1
SC-HSDPA is served by Cell 2
DC-HSDPA UE
DC-HSDPA is served by both
Cell 1 and Cell 2
Throughp ut rat io
(SC1 vs. SC 2 vs . DC
User)
Approximately 1:1:1
Conditions and Assumptions
Total UE number 3
SC-HSDPA UEnumber
1 in Cell 11 in Cell 2
DC-HSDPA UE
number1
DC-HSDPA UE
categoryCat 24
SC-HSDPA UE
category Cat 14
User locat ionThe three users in
the same location
SC2 User
Scheduling Example 3
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Primary
(Cell 1)
Secondary
(Cell 2)
SC2 User
DC
User
Expected Scheduling Results
SC-HSDPA UEBoth the two SC-HSDPA users
are served by Cell 1
DC-HSDPA UEDC-HSDPA is served by both
Cell 1 and Cell 2
Throughp ut rat io
(SC1 vs. SC 2 vs . DC
User)
Approximately 1:1:2
Conditions and Assumptions
Total UE number 3
SC-HSDPA UE
number 2 in Cell 1
DC-HSDPA UE
number1
DC-HSDPA UE
categoryCat 24
SC-HSDPA UE
category Cat 14
User locat ionThe three users in
the same location
SC1 User
Scheduling Example 4
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Contents
1. Basic Principle of DC-HSDPA
2. Radio Resource Management of DC-HSDPA
3. Implementation of DC-HSDPA
4. The Performance of DC-HSDPA
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Enable DC-HSDPA
License is available
Software: RAN12.0 and later
version
Switch: DC_HSDPA should be ON
Hardware requirementNetwork Element Boards/Module/VersionBTS3812E/BTS3812AE HBBI and HDLP EBBI or EDLP
DBS3800 BBU3806 without EBBC or EBBCd BBU3806 with EBBC or EBBCd
3900 series NodeB WBBPa WBBPb or WBBPd
Dependency on other RAN features
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Key ParametersParameter Description
DCHSDPASwitch DC-HSDPA will be supported with this parameter switch on
ULLdbDRDSwitchDcHSDPA UL Load Balance procedure can be triggered with this
parameter switch on
ULLdbDRDLoadRemainThdDcH
SDPA
During the DC-HSDPA UE try to access the network by cell
A, if the remained UL load of cell A is smaller than this
parameter, network will trigger UL Load Balance procedure
to select suitable cell as the Anchor Carrier
ULLdbDRDOffsetDcHSDPA During the UL Load Balance Procedure, if the UL Load
difference between the current cell and a DRD cell is larger
than this parameter, the cell can be the target cell
MIMO64QAMorDCHSDPASwitc
h
Select between MIMO and DC-HSDPA for UE if UE support
both MIMO and DC-HSDPA
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DC-HSDPA RNC Counters
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DC-HSDPA NodeB Counters
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Contents
1. Basic Principle of DC-HSDPA
2. Radio Resource Management of DC-HSDPA
3. Implementation of DC-HSDPA
4. The Performance of DC-HSDPA
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DC-HSDPA increases user peak rate
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Gain of DC-HSDPA for Burst services
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Gain of DC-HSDPA for large size
services
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Summary of DC Gain
In Muti-User Burst Services (HTTP, WAP and etc.)
scenarios, the DC-HSDPA can maximize the utilization of
Uu resources and make significant improvement for QoS
Especially, the double instantaneous bit rate (comparingwith SC-HSDPA) , not related with the UE location
(comparing with MIMO) , can be achieved on Non-
Congestion Status
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DC-HSDPA vs MIMO
DL Cell Throughput ComparisonPA3, Macro cell, 10user/sector, wrapround cell, ISD500m, DL 64QAM
6
8
SC-HSDPA DC-HSDPA SC-HSDPA MIMO
ThroughputinMAC
layer(Mbps)
7.4%10.9%
CDF of UE Throughput in MAC LayerMacro,PA3, 10user/sector, wrapround cells, ISD 500m
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 1000 2000 3000 4000 5000
UE Throughput(Kbps)
cumulativedistribution
SC+64QAMDC+64QAMMIMO+64QAM
Rate
Difference of
10% best
users
6%
Notes: Ful lBuf fer serv ice ; u sers are dropped uni formly.
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System Simulation for full buffer service with 64QAM
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DC-HSDPA vs MIMO
64QAM+DC-HSPA 64QAM+MIMO
Peak data rate 42Mbps 42Mbps
Data rate/user
In the whole cell, the
throughput/user can be
increased by up to 100%
Gain from 44% to 85% (field test)
vs Non-MIMO, depending on the
radio condition
Improvement on
system capacity
Gain from joint scheduling.
Make full use of the DC-HSDPAcells.
Gain from multi-antenna and
higher spectrum efficiency.
System requirementMulti carrier RF part
2*5MHz adjacent carrier2 Tx RF part or 2* RF part
Deployment impact
Possible Negative performance
impact to traditional HSDPA user,
independent carrier is preferred
Terminal availability 2010Q3 or later 2011Q1 or later
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Specifications of HSPA
Technology Maximum rate per user Maximum users per cellHSDPA HSDPA 1.8Mbps per User 6 HSDPA Users per CellHSDPA 3.6Mbps per User 32 HSDPA Users per Cell
HSDPA 7.2Mbps per User 64 HSDPA Users per Cell
HSDPA 13.976Mbps per User
HSPA+ downlink HSPA+ Downlink 21Mbps per User 96 HSDPA Users per Cell
HSPA+ Downlink 28Mbps per User 128 HSDPA Users per CellHSPA+ Downlink 42Mbps per User
HSUPA HSUPA 1.44Mbps per User 20 HSUPA Users per Cell
HSUPA 5.74Mbps per User 60 HSUPA Users per Cell
HSPA+ uplink - 96 HSUPA Users per Cell
128 HSUPA Users per Cell
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