Công nghệ HSDPA và ứng dụng

The driver to HSDPA HSDPA is a new technology to enhance WCDMA PS data service  HSDPA gives subscribers new experience of more higher speed data service with shorter time delay  HSD

HSDPA Technology

ZTE University TD&W&PCS BSS Course Team

Driver to HSDPA

HSDPA Theory HSDPA Terminal and Commercial Situation

HSDPA Solution

 CDMA2000 1x: 153.6kbit/s, Service deployment is good

3G

CDMA 1x EV-DO: 2.4Mbit/s

WCDMA R99/R4: 2Mbit/s

Peak data rate (Kbps)

Mean data rate (Kbps)

R9 9

The driver to HSDPA

 HSDPA is a new technology to enhance WCDMA PS data service

 HSDPA gives subscribers new experience of more higher speed data

service with shorter time delay

 HSDPA brings more bandwidth and more online subscribers

 It is necessary and feasible to introduce HSDPA to WCDMA network

 With consideration of network planning and deployment cost, HSDPA

should be applied at the beginning, or at least the Node B should

hardware ready for HSDPA

 HSDPA brings new requirement of transmission and network planning

Pay more attention to it

High Speed Downlink Packet Access

HSDPA, Mature technology

2002.6 R5 released

2003.6 HSDPA (High Speed Downlink Packet Access) was added into R5

2002.6 R5 released

2003.6 HSDPA (High Speed Downlink Packet Access) was added into R5

HSDPA is smoothly evolved from WCDMA R99 without any big effect to the existing

R99 network

 1 new transport channel: HS-DSCH

 3 new physical channels ： HS-PDSCH, HS-SCCH and HS-DPCCH

 MAC-hs sub-layer, HARQ (Fast Hybrid Automatic Repeat reQuest), Fast Scheduling

and AMC (Adaptive Modulation and Coding)

HSDPA is smoothly evolved from WCDMA R99 without any big effect to the existing

R99 network

 1 new transport channel: HS-DSCH

 3 new physical channels ： HS-PDSCH, HS-SCCH and HS-DPCCH

 MAC-hs sub-layer, HARQ (Fast Hybrid Automatic Repeat reQuest), Fast Scheduling

and AMC (Adaptive Modulation and Coding)

HSDPA Max downlink data rate: 14.4Mbps

Competition advantage of HSDPA

(SF=32, SF=16 or SF=8)

64(117.7kbps per user, SF=16, R=3/4,

16QAM)

CDMA2000 1x

59 (only tens of kbps, 200kbps when 8 users is configured)

HSDPA supports more users while provides higher data rate!

Perspective of HSDPA application

 Higher data rate

 More users

 Richer service Obvious advantage to compete with other 3G technology like CDMA2000

HSDPA data card

HSDPA PDA

Mixed with WMAN (WiMAX) and WLAN (Wi-Fi), more advantage of broadband wireless access

 HSDPA data card

HSDPA PDA

Mixed with WMAN (WiMAX) and WLAN (Wi-Fi), more advantage of broadband wireless access

Evolve from R99/R4 to HSDPA

L2

L1

DSCH

FP RLC

Uu

MAC-d

HS-DSCH FP

HS-DSCH FP MAC-hs

PHY (add 3 channels)

RNC, Node B: add HS-DSCH FP protocol process, involve Iub/Iur

Node B: add MAC-hs, responsible for AMC, HARQ, etc

Node B: add 3 physical channels: HS-PDSCH,HS-SCCH,HS-DPCCH

UE: add MAC-hs, physical channels and process, modulation

MAC (add MAC-hs)

PHY (add process)

New physical channels of HSDPA

 HS-PDSCH is the bearer of HS-DSCH, transfer HSDPA user data (downlink) 2ms TTI, 3

slots, spread factor is fixed to 16, multiple users & multiple codes, modulation method: QPSK and 16QAM

 HS-SCCH bears information of HS-DSCH such as UE specialized mask code, modulation and coding policy, etc (downlink) 2ms TTI, 3 slots, spread factor is fixed to 128

 HS-DPCCH bears feedback information of HS-PDSCH such as Channel Quality Indication

(CQI), H-ARQ confirm information ACK/NACK, etc (uplink) 2ms TTI, 3 slots, spread factor

is fixed to 256

HS-DPCCH

DPCH DCCH（信令）＋UL DTCH（PS业务）

DL DTCH (PS 业务)

R99 channel HSDPA channel

HSDPA working procedure

RNC Node B

(AMC and HARQ)

Data Packet

⑤A CK /NA CK （ HS -

ed )

(HS -DS

CH )

 AMC, modulation and coding selection

 HARQ, lowers the time delay, improves the data throughput

 Fast scheduling, quick decision

 AMC, modulation and coding selection

 HARQ, lowers the time delay, improves the data throughput

 Fast scheduling, quick decision

HS -SC

CH )

Da ta (HS -DS

CH )

②Evaluation, HS-DSCH parameters setting

④Receive data from HS-DSCH

according to Detecting

HS-SCCH

Key technology: AMC (1)

 Adaptive Modulation and Coding (AMC), Node B can adjust modulation (QPSK, 16QAM) and coding rate (1/3, 3/4, etc) in time according to the feedback channel state from UE

So data transferring can follow the step of channel state

changing in time, it is a good technology for link self-adaptive

 For long time delay packet data, AMC can improve system

capacity without add interference to neighbor cells

Standard AMC Remark

R99/R4 N Quick power control

Key technology: AMC (2)

Node B

CQI (Report periodically)

Modulation (QPSK, 16QAM) self-adaptive

Good channel state: 16QAM

Bad channel state: QPSK

Coding rate (1/3, 3/4, etc.) self-adaptive

Good channel state: 3/4

Bad channel state: 1/3

Efficiently utilize the channel condition

 Good channel state: higher speed

 Bad channel state: lower speed

Codes adjustingGood channel state: more codesBad channel state: fewer codes

Key technology: AMC (3)

Standard Data rate (kbps) SF Modulation Coding rate R99/R4 384 8 QPSK 1/2 HSDPA 720 16 16QAM 3/4

 HSDPA, the service bearing ability of one channel is further larger than R99/R4

by using more efficient modulation and coding rate, while SF is twice as R99/R4

 As using bigger SF, system can support more users

HSDPA, R99/R4 channel bearing ability comparison

16QAM and higher coding rate

Key technology: AMC (4)

Modulation coding

rate

Data rate (1 code)

Data rate (5 codes)

Data rate (15 codes) QPSK 1/4 120kbps 600kbps 1.8Mbps QPSK 1/2 240kbps 1.2Mbps 3.6Mbps QPSK 3/4 360kbps 1.8Mbps 5.4Mbps 16QAM 1/2 480kbps 2.4Mbps 7.2Mbps 16QAM 3/4 720kbps 3.6Mbps 10.8Mbps

HSDPA throughput, relative with modulation & coding rate

AMC and multiple codes technology

 In the situation of high speed, HSDPA requires high channel condition

Multiple coding rates

Key technology: HARQ (1)

 Hybrid Automatic Repeat reQuest (HARQ) is a combined technology with Forward Error

Correction (FEC) and Automatic Repeat reQuest (ARQ)

 HARQ can provide flexible and subtle adjustment for its process by cooperated with AMC

 Hybrid Automatic Repeat reQuest (HARQ) is a combined technology with Forward Error

Correction (FEC) and Automatic Repeat reQuest (ARQ)

 HARQ can provide flexible and subtle adjustment for its process by cooperated with AMC

Standard HARQ Remark

R99/R4 N FEC is in high layerARQ is in RLC layer, channel feedback is slow

L1 HARQ

HARQ MAC- hs

TFRC

L1

L2

Key technology: HARQ (2)

Advantage: improve transferring reliability

Disadvantage: lower utilization in bad

channel state

Advantage: good performance in

lower Bit Error Rate (BER)

Disadvantage: bad performance in

high BER

F E C A R Q

H A R Q

Combine FEC and ARQ, each sending packet includes error detection bit and error correction bit

Packet

A confirm

Packet

A confirm

Packet A missing data

Packet A missing data

Packet A missing data

HARQ phase I

（ Resending is in RNC ， R99 ）

HARQ phase II, III

（ Resending is in Node B, HSDPA ）

Resend require

ment

Resend require

ment

Packet B Packet B

Send Receive Send Receive

Lower efficiency Longer time delay

Higher efficiency Shorter time delay

Key technology: Quick scheduling (1)

With quick channel feedback, HSDPA can suitably adjust coding rate, codes, modulation, etc in time according to the channel state

Standard TTI (ms)

Channel feedback time delay (ms)

Remark

R99 10 100 (at least)

Supports continuous feedback, R5 also supports 10ms TTI

feedback time delay

is about 8.5 TS

Quick channel feedback

Key technology: Quick scheduling (2)

Every user get the same traffic, but the time maybe not equal, has the lower utility of system resource because it will schedule the UE with bad channel state

Only the user in best channel state (biggest C/I) will get the service priority in each turn, the biggest traffic but has the worst fairness

Weighted compromise of above algorithms and has bigger system traffic and better service fairness

UE1

Only hard handover

Power control Open loop, Close loop (Inner loop, Outer loop)

Provides various speed

with stable power

(stable power, adjustable speed)

Adjust power to guarantee service speed

(stable speed, adjustable power)

Driver to HSDPA HSDPA Theory

HSDPA Terminal and Commercial Situation

HSDPA Solution

Terminal Changing caused by HSDPA

 advanced receive and process algorithm

 16QAM demodulation, multiple decoding

 MAC-hs process

 multiple codes

HSDPA terminal, first choice for high-end commercial

application

HSDPA terminal category and capability

UE category Maximum channels Minimal TTI interval Maximum service speed (Mbps) Modulation

QPSK 16QAM

 Different UE supports various channels, minimal TTI and other parameters

 UE listed in Category 11 is in worst receive capability, Category 10 is the best

HSDPA terminal

HSDPA handset HSDPA pc card HSDPA PDA

HSDPA commercial process

 Terminals

2005 2Q, several manufacture promote HSDPA trial version terminal

2005 4Q, promote commercial HSDPA terminal

 Operator to deploy HSDPA

Cingular plan to deploy HSDPA in major city, 2006; till the end of 2006, to provide the HSDPA service in most part of metropolitans.

NTT Docomo will deploy HSDPA in first quarter 2006; In UK, mmO2 will launch the service in fourth quarter 2005 ； in HK H3G will provide commercial service in first quarter 2006

2005 2Q, several manufacture promote HSDPA trial version terminal

2005 4Q, promote commercial HSDPA terminal

 Operator to deploy HSDPA

Cingular plan to deploy HSDPA in major city, 2006; till the end of 2006, to provide the HSDPA service in most part of metropolitans.

NTT Docomo will deploy HSDPA in first quarter 2006; In UK, mmO2 will launch the service in fourth quarter 2005 ； in HK H3G will provide commercial service in first quarter 2006

 HSDPA standard has been determined

 HSDPA has adequate test instruments

 HSDPA technology has been tested in application

 Manufactures provide HSDPA commercial terminals in 2005

 USA, Japan and the other operators start the HSDPA network construction

 ZTE equipment are HSDPA ready

High data service brings new experience

明天去吧

 Adopt the HSDPA, operator can provide higher bandwidth service

 To deploy new service.

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Driver to HSDPA HSDPA Theory HSDPA Terminal and Commercial Situation

HSDPA Solution

HSDPA link budget R99/R4 link budget

Max path loss 128.7366 129.3415 126.9723 130.9364017 128.8382003 129.7567

HSDPA can achieve the same coverage as R99/R4 under same data rate

Link budget for HSDPA

Combination of HSDPA and R99/R4

 HSDPA makes the balance between the coverage and the throughput, increase the coverage decrease the throughput.

 HSDPA provides about 200kbps in the edge of cell, Less than the R99/R4 DCH.

 Recommend to combine the HSDPA and R99/R4 DCH together, at the edge of cell UE can

“handover” into DCH With this combination, you can take the most advantage from R99/R4 and HSDPA.

 HSDPA makes the balance between the coverage and the throughput, increase the coverage

decrease the throughput.

 HSDPA provides about 200kbps in the edge of cell, Less than the R99/R4 DCH.

 Recommend to combine the HSDPA and R99/R4 DCH together, at the edge of cell UE can

“handover” into DCH With this combination, you can take the most advantage from R99/R4 and HSDPA.

0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0

Combination of HSDPA and R99/R4

Combination of HSDPA and R99/R4

Combination of HSDPA and R99/R4

Combination of HSDPA and R99/R4

Total HSDPA Power offset to BsTxPwer (dB)

HSDPA heavy load HSDPA light load

Combination of HSDPA and R99/R4

Combination of HSDPA and R99/R4

ZTE HSDPA construction solution

If necessary, use

a carrier only to support PS data

Network construction

plan Frequency point assignment Resource condition Advantage and disadvantage Recommended deployment

Intra-frequency plan

F1: HSDPA+R99/R4 Less inter-frequency handover,

admission control, load control and power control can be achieved within one same frequency cell.

Advantage: easy to do resource control Disadvantage: do not have user detail classification

After the network construction finished, to achieve the high demand of voice and PS downlink.

F2: HSDPA+R99/R4

Inter-frequency plan F1: R99/R4

Situation I: if HSDPA frequency point support normal handset, all the resource have to be assigned within various different frequency cells.

Situation II: HSDPA frequency point are only used for PC card,

resource management can be achieved more easily.

Advantage: voice user +HSDPA users get good service

Disadvantage: resource control will be difficult in situation I, maybe some frequency point resource will

be wasted at the beginning

With the development of 3G,

to provide dedicated frequency point for HSDPA

PC card (only PS domain)

F2: HSDPA

HSDPA (PC card)

HSDPA construction area

Phase I :several hot spot, and the important building

to deploy HSDPA

Phase II :all the hot spot and several macro sites to deploy HSDPA

Handover between HSDPA and R99/R4

we trigger the handover

trigger handover while the traffic load of HSDPA cell is too heavy and the load of R99/R4 cell is lower, or the traffic load of different HSDPA cells are not in balance

Handover based

on service

According to the service type and data rate to choose HSDPA or R99/R4 network

Low speed data service can be handled with FACH, Streaming service can be handled with DCH; the rest high speed PS data service or non-real time data service should be assigned to HSDPA

Handover between HSDPA, R99/R4 and DCH/FACH channels ， can

guarantee the service stability of HSDPA

Network analysis for HSDPA and R99/R4

 After the 3G network construction, the basic demand of WCDMA network

should adopt HSDPA function, with soft smooth upgrade ability

 HSDPA is not constructed as a individual network, HSDPA is a enhanced

technology of WCDMA (throughput, users)

 Network construction and plan for R99 and HSDPA based on the “one-shot planning, multi-stage deployment”

 HSDPA and R99 share the same network, Node B supports HSDPA

function

 At dense traffic area (capacity is restricted), HSDPA can share the

same site of R99 and achieve the same coverage of it.

 Capacity and coverage is a balance relationship, increase the network performance to the maximum by making a balance between them.

 After the 3G network construction, the basic demand of WCDMA network

should adopt HSDPA function, with soft smooth upgrade ability

 HSDPA is not constructed as a individual network, HSDPA is a enhanced

technology of WCDMA (throughput, users)

 Network construction and plan for R99 and HSDPA based on the “one-shot planning, multi-stage deployment”

 HSDPA and R99 share the same network, Node B supports HSDPA

function

 At dense traffic area (capacity is restricted), HSDPA can share the

same site of R99 and achieve the same coverage of it.

 Capacity and coverage is a balance relationship, increase the network performance to the maximum by making a balance between them.

HSDPA for major area

Area type Square (km 2 ) Erl

Major area ： dense urban +

urban

HSDPA outdoor coverage

Node B

Adaptive modulation

 Good channel state: 16QAM

Adaptive coding rate

Good channel state: 3/4

AMC

HSDPA requires a good channel condition for high speed service:

 Good channel state