View
180
Download
5
Category
Preview:
Citation preview
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Security Level: Internal Use Only
Slide title :40-47pt
Slide subtitle :26-30pt
Color::white
Corporate Font :
FrutigerNext LT Medium
Font to be used by customers and
partners :
Arial
www.huawei.com
HSDPA Basic Principle
HUAWEI TECHNOLOGIES CO., LTD. Page 2Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Learning Objectives
HSDPA basic principle and feature
HSDPA key technologies
HSDPA physical channels
HUAWEI TECHNOLOGIES CO., LTD. Page 3Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Contents
Chapter 1 HSDPA Basic Concepts and Characteristics
Section 2 Key Techniques
Section 3 Physical Channel
HUAWEI TECHNOLOGIES CO., LTD. Page 4Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Basic Concepts
HSDPA = High Speed Downlink Packet Access Important Features of 3GPP R5 Why HSDPA?
The subscribers request higher speed and better quality data access
Competition challenge from CDMA EV/DO, WiMAX Up to now, the throughput request for downlink is much
more higher than that of uplink The channel configuration of R99 lead a very low
efficiency on the downlink capacity
HUAWEI TECHNOLOGIES CO., LTD. Page 5Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Characteristics
HSDPA is the solution of WCDMA offering higher speed downlink data services.
Peak data rate in DL: 14.4Mbps (physical layer) Shorter delay Higher efficiency using downlink code and power and bigger
downlink capacity Flexible cell resource allocation More high speed user access
UMTS R99
GSM
HSDPA
HUAWEI TECHNOLOGIES CO., LTD. Page 6Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Contents
Chapter 1 HSDPA Basic Concepts and Characteristics
Chapter 2 Key Techniques
Chapter 3 Physical Channel
HUAWEI TECHNOLOGIES CO., LTD. Page 7Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Key Techniques- OverviewHSDPA Key Techniques- Overview
AMC Fast SchedulingHARQ (Hybrid ARQ)
16QAMSF16, 2ms and CDM/TDM 3 New Physical Channels
Adaptive Modulation and Coding Hybrid Automatic Repeat Request
HUAWEI TECHNOLOGIES CO., LTD. Page 8Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Key Techniques
Fast Scheduling(2ms short frame and scheduling)
AMC (support QPSK and 16QAM) HARQ
HUAWEI TECHNOLOGIES CO., LTD. Page 9Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Fast Scheduling Basic
If a little part of received 10ms frame (15 slots - R99) can’t be decoded correctly, whole frame will be retransmit 10ms later.
An HSDPA frame is only 2ms(3 slots). If a 2ms frame can’t be decoded correctly, just this 2ms frame need be retransmitted. Other 2ms(up to 6) HARQ process may continue transmitting data, thus radio resource could be used more effectively.
Physical Layer Basic
HUAWEI TECHNOLOGIES CO., LTD. Page 10Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Fast SchedulingFast Scheduling
Scheduling Principle: based on channel condition in short period; based on balance between throughout and proportional fair for all users in long period.
Scheduling Principle: based on channel condition in short period; based on balance between throughout and proportional fair for all users in long period.
Some basic scheduler
Round Robin (RR)
Maximum C/I (MAXC/I)
Proportional Fair (PF)
Some basic scheduler
Round Robin (RR)
Maximum C/I (MAXC/I)
Proportional Fair (PF)
By fast scheduling, HSDPA cell can allocate the available HSDPA power resource and code resource among users effectively, to improves the throughout.
Scheduler may works based on CDM
and/or TDM
Channel condition
Amount of data waiting in the queue (delay)
Fairness
Cell throughout, etc
Scheduler may works based on CDM
and/or TDM
Channel condition
Amount of data waiting in the queue (delay)
Fairness
Cell throughout, etc
HUAWEI TECHNOLOGIES CO., LTD. Page 11Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Share and Scheduling of Shared Channel
The following fig describes scheduling processing for 4 users.
All codes reserved for HSDPA transmission
2ms
HUAWEI TECHNOLOGIES CO., LTD. Page 12Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Fast Scheduling ProcessFast Scheduling Process
•Transmit power for which users
•Channelization code
•Data attributes
•Transmit power for which users
•Channelization code
•Data attributes
Scheduling Algorithm
Available resourceAvailable resource
Required resourceRequired resource
Temporary statisticTemporary statistic
Input:
1. Available resource: power and channelization code
2. Required resource: including users, user data, retransmission, air interface ability estimate, etc.
3. Temporary statistic of scheduling algorithm: waiting time, average C/I, etc.
Output:
Transmit power for which users, power, channelization code, data attributes
HUAWEI TECHNOLOGIES CO., LTD. Page 13Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Max C/I Scheduling AlgorithmMax C/I Scheduling Algorithm
Features:1) Allocates channel to the user with max C/I in one TTI.
2) Provides the highest cell throughout, because channel is allocated to the user in the best radio condition .
3) It is not fair for the users located in areas of poor coverage. By max C/I algorithm, the system hardly allocate channel for users under pool signal condition.
HUAWEI TECHNOLOGIES CO., LTD. Page 14Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
RR Scheduling Algorithm (RR - Round Robin)RR Scheduling Algorithm (RR - Round Robin)
Features:1) Every user has the same chance to occupy the channel and power.
2) It is very fair for every user, but it is not good to get a best cell throughput.
Note: User allocated resource
HUAWEI TECHNOLOGIES CO., LTD. Page 15Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
PF Scheduling AlgorithmPF Scheduling Algorithm
Features:
1) A good balance scheme, whose fairness and resource allocation efficiency is between RR and max C/I scheduling algorithm.
2) Probability of serving all users is the same, although different users have different average channel quality.
3) This scheme accounts for balance between system throughout and fairness.
Priority for UE = R/r:
R: required data rate of UE (calculated TB size per 2ms based on CQI)
r: amount of effective data (not including data retransmitted ) transmitted by transport layer for this UE during the past 1.6s
The bigger the R/r, the higher the priority (more chance to get resource).
(PF- Proportional Fair)
HUAWEI TECHNOLOGIES CO., LTD. Page 16Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Key Techniques
Fast Scheduling(2ms short frame and scheduling)
AMC (support QPSK and 16QAM) HARQ
HUAWEI TECHNOLOGIES CO., LTD. Page 17Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Adaptive Modulation and Coding (AMC)Adaptive Modulation and Coding (AMC)
AMC is based on channel quality Adjust data rate
Good channel condition – higher rate
Poor channel condition – lower rate
Adjust code rate Good channel condition – higher rate (e.g. 3/4 code)
Poor channel condition – lower rate (e.g. 2/4 code)
Adjust modulation scheme Good channel condition – 16QAM
Poor channel condition – QPSK
Channel Quality Feedback (CQI) UE measures channel quality (SNR) and reports to
Node B every 2ms or longer time.
Node-B chooses modulation scheme, Transport
Block size and data rate based on CQI.
AMC is based on channel quality Adjust data rate
Good channel condition – higher rate
Poor channel condition – lower rate
Adjust code rate Good channel condition – higher rate (e.g. 3/4 code)
Poor channel condition – lower rate (e.g. 2/4 code)
Adjust modulation scheme Good channel condition – 16QAM
Poor channel condition – QPSK
Channel Quality Feedback (CQI) UE measures channel quality (SNR) and reports to
Node B every 2ms or longer time.
Node-B chooses modulation scheme, Transport
Block size and data rate based on CQI.
Throughput ~ SIR RelationshipThroughput ~ SIR Relationship
AMC could improve radio bandwidth and fit for high speed radio transmission.
HUAWEI TECHNOLOGIES CO., LTD. Page 18Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Modulation QPSK 16QAM
Modulation SchemeModulation Scheme
HUAWEI TECHNOLOGIES CO., LTD. Page 19Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
CQI Mapping Table (Category 10)CQI value
Transport Block Size
Number of HS-PDSCH Modulation Reference power adjustment NIR XRV
0 N/A Out of range
1 137 1 QPSK 0
28800 0
2 173 1 QPSK 0
3 233 1 QPSK 0
4 317 1 QPSK 0
5 377 1 QPSK 0
6 461 1 QPSK 0
7 650 2 QPSK 0
… … … … …
12 1742 3 QPSK 0
13 2279 4 QPSK 0
14 2583 4 QPSK 0
15 3319 5 QPSK 0
16 3565 5 16-QAM 0
... ... ... … …
21 6554 5 16-QAM 0
22 7168 5 16-QAM 0
23 9719 7 16-QAM 0
24 11418 8 16-QAM 0
25 14411 10 16-QAM 0
26 17237 12 16-QAM 0
… … … … 0
30 25558 15 16-QAM 0
AMC and modulation scheme recommend in protocolNode-B chooses modulation scheme, transport block size and data rate based on CQI.
HUAWEI TECHNOLOGIES CO., LTD. Page 20Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Link Emulation- AMC
AMC AMC PerformancePerformance
AMC changes transmission
parameters depending on channel
condition and optimize data rate. AMC performance is affected
by channel quality error and
feedback delay in fading channel. For low data rate, AMC has
better performance than fixed MCS. For high data rate, AMC has
worse performance than fixed MCS.
AMC gai n
0
100
200
300
400
500
600
- 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3
HS- DSCH Ec/ N0(dB)
Thro
ughp
ut(k
bps)
TU5(Fi xed MCS) TU5(AMC)
TU30(Fi xed MCS) TU30(AMC)
TU120(Fi xed MCS) TU120(AMC)
HUAWEI TECHNOLOGIES CO., LTD. Page 21Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
AMC Processing Flow
UE measure CPICH strength UE reports the signal quality by CQI (channel quality indicator) Node B may filter and rectify CQI report to obtain actual CQI Determine the channel number, transmit power and modulation
scheme, etc, based on CQI, transmit data volume, available power and code.
HUAWEI TECHNOLOGIES CO., LTD. Page 22Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Key Techniques
Fast Scheduling(2ms short frame and scheduling)
AMC (support QPSK and 16QAM) HARQ
HUAWEI TECHNOLOGIES CO., LTD. Page 23Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Hybrid Automatic Repeat Request (HARQ)Hybrid Automatic Repeat Request (HARQ)
Tranditional ARQ–decode received transport block
–detect if there is CRC error in decoded transport bolck
–If there is CRC error
•discard error block
•Request retransmission
Tranditional ARQ–decode received transport block
–detect if there is CRC error in decoded transport bolck
–If there is CRC error
•discard error block
•Request retransmission
Hybrid ARQ–decode received transport block
–Detect if there is CRC error in decoded transport bolck
–If there is CRC error
•Store error block(no discard)
•Request retransmission
•Combine the currently received retranmission with the previous failed decodes.
Hybrid ARQ–decode received transport block
–Detect if there is CRC error in decoded transport bolck
–If there is CRC error
•Store error block(no discard)
•Request retransmission
•Combine the currently received retranmission with the previous failed decodes.
Soft Combine
Increment redundancy
HARQ helps minimize retransmission time and increase cell throughout.
Combined HARQ
Block1
Block1
Block1?
Block1
Block1
Block2
HUAWEI TECHNOLOGIES CO., LTD. Page 24Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HARQ Concept
HARQ is a technique that transmitter sends new set of check bits if the previous transmission failed (NACK) while receiver buffers the failed decodes for soft combining with future retransmissions.
The RV parameter indicates different code bit transmit in IR buffer. Different RV parameter configuration supports:
CC (Chase Combining): retransmit the same coded data
PIR (Partial Incremental Redundancy): transmit systematic bits first
FIR (Full Incremental Redundancy): transmit parity bits first
HUAWEI TECHNOLOGIES CO., LTD. Page 25Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HARQ Gain
One retransmission gain for different retransmission scheme
Code Rate 1/3 1/2 2/3 3/4
CC Gain (dB) 3.0 3.0 3.0 3.0
PIR Gain (dB) 3.1 3.3 3.6 6.5
FIR Gain (dB) 3.1 3.5 4.3 8.4
FIR scheme will transmit the check bits first, it has effective average coded bits after retransmission. Especially for high code rate, the HARQ gain is very evidence.
HUAWEI TECHNOLOGIES CO., LTD. Page 26Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Link Emulation- HARQ
HARQ( Hybrid ARQ) Performance
HARQ may reduce effect by channel measure error and feedback delay, and provide AMC performance gain.
Higher speed, higher HARQ gain.
HARQ Gai n over AMC
0
100
200
300
400
500
600
- 12. 5 - 11. 5 - 10. 5 - 9. 5 - 8. 5 - 7. 5 - 6. 5 - 5. 5 - 4. 5 - 3. 5
HS-DSCH Ec/ N0(dB)
Thro
ughp
ut(k
bps)
TU5(AMC+HARQ) TU5(AMC)
TU30(AMC+HARQ) TU30(AMC)
TU120(AMC+HARQ) TU120(AMC)
HUAWEI TECHNOLOGIES CO., LTD. Page 27Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Contents
Chapter 1 HSDPA Basic Concepts and Characteristics
Section 2 Key Techniques
Section 3 Physical Channel
HUAWEI TECHNOLOGIES CO., LTD. Page 28Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Relevant Physical Channel Three new HSDPA Physical Channel
For each HS-DPCCH, SF=256
Each H has one HS-DPCCH.
For each HS-SCCH, SF=128
Each cell is assigned up to 4 HS-SCCH (limited by UE capability)
For each HS-PDSCH, SF=16
HUAWEI TECHNOLOGIES CO., LTD. Page 29Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Channel Mapping
HUAWEI TECHNOLOGIES CO., LTD. Page 30Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Associated Channel - DPCH
There is another dedicated physical channel named DPCH for each HSDPA user. DPCH is also called associated channel in HSDPA. It is used for signaling transport and power control.
Normally DPCH doesn’t carry service data, only sometimes carry real time services such as AMR (the user setup multiple RAB: CS+PS).
Node B
UE
HS-PDSCH HS-SCCH DPCH HS-DPCCH
“Associated”? Or “Concomitant”?
HUAWEI TECHNOLOGIES CO., LTD. Page 31Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Physical Channel (HS-SCCH)HS-SCCH and HS-PDSCH
are downlink shared channel shared by all users. How can users
know when and on which channel my data is
transported?
HS-SCCH and HS-PDSCH are downlink shared channel shared by all users. How can users
know when and on which channel my data is
transported?
HS-SCCH is like soldiers holding flags at the first row of queue. UE keeps on monitoring the HS-SCCH channels to identify any HS-PDSCH subframes addressed to it on the sets of HS-PDSCH channels. Upon receiving an HS-PDSCH subframe for the UE, the UE physical layer will demodulates the subframe, otherwise do nothing.
HS-SCCH is like soldiers holding flags at the first row of queue. UE keeps on monitoring the HS-SCCH channels to identify any HS-PDSCH subframes addressed to it on the sets of HS-PDSCH channels. Upon receiving an HS-PDSCH subframe for the UE, the UE physical layer will demodulates the subframe, otherwise do nothing.
HUAWEI TECHNOLOGIES CO., LTD. Page 32Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Physical Channel Slot Format (HS-SCCH) HS-SCCH Slot Format Features
3 slots in one TTI (2ms) SF=128, QPSK modulation Maps user’s seven data attributes, including Xue, Xccs, Xms, Xrv, Xtbs, Xhap and Xnd; UE demodulates HS-SCCH and find out the received data addressed to the UE. Then
UE demodulates the HS-PDSCH. In theory, one cell can configure up to 15 HS-SCCH. But now commercial UE can only
monitor up to 4 HS-SCCH channels simultaneously. So one cell only configure up to 4 HS-SCCH channels.
Slot #0 Slot#1 Slot #2
T slot = 2560 chips, 40 bits
DataN data 1 bits
HS-SCCH subframe: T = 2 ms
HUAWEI TECHNOLOGIES CO., LTD. Page 33Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Physical Channel Slot Format (HS-PDSCH)
Slot #0 Slot#1 Slot #2
T slot = 2560 chips, M*10*2 k bits (k=4)
Data N data 1 bits
1 subframe: T f = 2 ms
HS-PDSCH Slot Format Attributes:3 slots in one TTI (2ms)
Fixed spreading factor SF16
QPSK or 16QAM modulation
Only carry user data
UE may be assigned multi channelization codes to support multi-code transport depending on UE capability.
HUAWEI TECHNOLOGIES CO., LTD. Page 34Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Physical Channel Slot Format (HS-DPCCH) Uplink HS-DPCCH
TTI 2ms (3 slots), SF 256, Fixed rate of 15Kbps,carry 2 types of HSDPA uplink physical layer signaling: ACK/NACK and CQI.
ACK and NACK notifies the NodeB if UE has received correct downlink data or not. The field defines like this:1-Nack, 0-Ack
CQI is a metric that reflects physical channel quality indicator based on CPICH, and reported by period ranging from 0, 2ms…. to 160ms (0 means no transmission). Usually the period is 2ms (one TTI).
ACK/NAK and CQI having different function may be controlled independently by different parameters .
ACK/NACK/CQI could be configured to repeat up to 4 times to improve TSTD gain.
Subframe #0 Subframe # Subframe #4
HARQ-ACK CQI
One radio frame T f = 10 ms
One HS-DPCCH subframe (2 ms)
2 T slot = 5120 chips T slot = 2560 chips
HUAWEI TECHNOLOGIES CO., LTD. Page 35Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Physical Channel Timing Start of HS-SCCH is aligned with the start of P-CCPCH, HS-PDSCH subframe
is transmitted two slots after the associated HS-SCCH subframe. UE demodulates HS-PDSCH subframe according to HS-SCCH.
HS-SCCH and PDSCH are common channels, so there are not timing between HS-SCCH/PDSCH and DPCH.
HS-SCCH
HS-PDSCH
3 slots = 2 ms
DPCH
DPCH
Radio frame with (SFN modulo 2) = 0 P-CCPCH
2 slots
3 slots = 2 ms
Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot Slot
15 slots = 10 ms
Subframe #0 Subframe #1 Subframe #2 Subframe #3 Subframe #4
Radio frame with (SFN modulo 2)=1
10 ms
Subframe #0 Subframe #1 Subframe #2 Subframe #3 Subframe #4
HS-DPCCH
3 slots = 2 ms
~7.5 slots
HUAWEI TECHNOLOGIES CO., LTD. Page 36Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
UE Capacity Category( for reference)
HUAWEI TECHNOLOGIES CO., LTD. Page 37Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA Physical Channel Transmit Power PHSDPA(HSDPA total transmit power) = PHS-PDSCH + PHS-SCCH
The HS-PDSCH transmit power is adjusted by Node B according
to the following factors:
CQI
Amount of data to be transmitted
Available power for HS-PDSCH
Available code resource for HS-PDSCH
HS-SCCH transmit power may use:
Fixed power transmission (outdoor 5%, indoor 3% of the total power)
A fixed power offset between HS-SCCH and DL associated channel
(PDCH). HS-PDSCH transmit power is usually bigger than the PDCH
channel to keep a proper transmit power.
HS-DPCCH transmit power has a power offset based on UL DPCH.
Slot carrying HARQ-ACK/NACK or CQI may be set different power offset.
HUAWEI TECHNOLOGIES CO., LTD. Page 38Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
Slide text :20-22ptBullets level 2-5:
18pt Color:Black
Corporate Font :FrutigerNext LT Medium
Font to be used by customers and
partners : Arial
HSDPA – Channel MappingWhen RAB is mapped onto HS-DSCH, DPCH is needed to transport UL RLC AM information and possible UL data, no matter there is UL data to transport.
The following figure describes that DL TRB is carried on HS-DSCH SRB and SRB or UL service is carried on DCH. In soft handover, there may be one or more DCH, but only one HS-DSCH.
Thank youwww.huawei.com
Recommended