Training Material_HSPA+ Principle

8/10/2019 Training Material_HSPA+ Principle

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HSPA+ Principle

-UMTS Radio Network Planning & Optimization Dept


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Contents

HSPA+ GENERAL INTRODUCTION

HSPA+ SYSTEM ARCHITECTURE

HSPA+ KEY TECHNOLOGIES

HSPA+ FEATURE DEVELOPMENT


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Wireless Technology Development

IntroductionAs wireless communication technology evolve from 2G3G3.9G,

mobile voice service also evolve toward high speed date service.

As for WCDMA system, it has been evolved to 3.5G which can

provide commercial version R5 and trial version R6.

3GPP is busy with modifying R7/HSPA+ and R8/LTE. It is

expected that R7 will be frozen in year 2007 and R8 in year 2008.

It will take more account of operators needs in the process of wireless

technology development -- NGMN organization has proposed

systematical development target.
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Wireless Communication Technology

Evolution

2G 2.5G 3G 3.5G 3.75G 3.9G2.75G

GSMWCDMA

R99GPRS

EDGE

HSDPA HSUPA

HSPA+

LTE

IS-95CDMA2000

1X EV-DO

CDMA

2000 1X

EV-DO

Rev. A

EV-DO

Rev. BAIE

CDMA2000

1X EV-DV


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Origination of HSPA+

Along with the rapid development of the mobile communication

in the world, all the standard organizations are busy with

establishing relative standards. In order to compete with other

new technologies, such as WiMAX, 3GPP/3GPP2 began to

modify their network evolvement target and proposed LTE and

UMB respectively.

LTE finally selected OFDM/SC-FDMA as the basic multiple

access technology which can not be compatible with legacy 3Gsystem. As for those 3G operators just deployed 3G system in

recent years, they are not willing to change their 3G system

revolutionarily, so LTE is probably not the best selection to

maintain their market competitiveness.

The target of HSPA+ is to maintain the back compatibility with

UMTS R6 and to achieve the same performance in 5MHzbandwidth compared with LTE. Those operators who willing to

improve their 3G systems performance with small cost can

adopt HSPA+ technology.


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What is HSPA+?

HSPA Evolution is HSPA+. It means an evolvement direction which

is based on the CDMA and under the condition of compatible with

legacy HSDPA/HSUPA network, to enhance the HSPA network by

introducing some new technologies.

HSPA HSPA+ LTECarrier Single-Carrier Single-Carrier Multi-Carrier

Bandwidth 5MHz 5MHz Scalable

(1.25,2.5,5,10,15,20MHz)

MA Mode DS-CDMA DS-CDMA OFDMA(DL)

SC-FDMA(UL)


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Relationship between HSPA+ and HSPA HSPA is the abbreviation of both HSDPA and HSUPA which needs no

change of the legacy WCDMA networks architecture, just software

upgrade.

Similarities and differences between HSPA+ and HSPA:

Can share CN, no change in Iu interface

NodeB in HSPA+ has the function of RNC which eliminate the Iub interface

but increase the workload of Iur

Reduce user-plane latency; HSPA+ user plane protocol is terminated inNodeB+, HSPA user plane protocol is terminated in RNC

Reduce control plane (RRC Setup) latency; HSPA+ control plane protocol

is terminated in NodeB+, HSPA control plane protocol is terminated in RNC

Increased signaling workload because of mobility

HSPA+ network can inter-work with HSPA legacy UE, but CS services

require routing to legacy SRNC Mobility becoming weak because of frequent SRNC relocation

In short, HSPA network can partially smooth evolve to HSPA+ network, at

least no need CN change.


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Design Target of HSPA+

Achieve the same frequency efficiency as LTE in 5 MHz bandwidth;

Share the most of resources with LTE, eg. LTE CNSAE;

Simplify and reduce network elements;

Becoming packet network only high speed data channel (HS-DSCH, E-DCH)

used;

Backward compatible with R99/HSPA legacy UE, has a minimum impact on UE,

especially on control complexity;

Support HSPA+ function with small scale upgrade based on existing 3G network;

Bring minimum impact on NodeB, permit simple upgrade and hardware re-use,

but except for supporting extra function (enhance processing ability and RNC

function) with hardware upgrade;

R99-DCH and legacy HSPA UE can share carrier with E-HSPA UE with no

performance loss;

Inter-system mobility performance will not be less than R7.


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Initial System Performance Requirement

Data rate and throughput

Latency

User-plane RTT < 20 ms

Power-saving state to active < 50 ms

RRC idle to active < 100 ms

Spectrum efficiency

DL > 1.5 bps/Hz (assuming 2-antenna

terminal)

DL > 2.5 bps/Hz(assuming 4-antenna

terminal)

UL > 1.0 bps/Hz (assuming 2-RX

antenna in NodeB)

VOIP subscriber200

MBMS3 Mbps

Network architecture: flat

DL UL

Peak Data

Rate

> 40 Mbps > 10 Mbps

Aver

Throughput

> 10 Mbps >4 Mbps

Cell-edge

Throughput

> 3 Mbps > 1.5

Mbps

Ongoing


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Phase Target of Downlink Peak Rate

Bandwidth

HSPA+ P1(3GPP R7 )

HSPA+ P2(3GPP R8 )

HSPA+ P3(3GPP R9/R10 )

5MHz

SISO 21.09 SISO 21.09 SISO 21.09

2x2

MIMO27.95 2x2 MIMO 42.19 2x2 MIMO 42.19

10MHz N/A

SISO 42.19 SISO 42.19

2x2 MIMO 84.38 2x2 MIMO 84.38

4x4 MIMO 168.76 4x4 MIMO 168.76

20MHz N/A N/A

SISO 84.38

2x2 MIMO 168.764x4 MIMO 337.52


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Phase Target of Uplink Peak Rate

BandwidthHSPA+ P1

(3GPP R7 )

HSPA+ P2

(3GPP R8 )

HSPA+ P3

(3GPP

R9/R10 )

5MHz 11.498

SISO 17.247 SISO 17.247

2x2 MIMO 34.494 2x2 MIMO 34.494

N/A N/A 4x4 MIMO 68.988

10MHz N/A

SISO 34.494 SISO 34.494

2x2 MIMO 68.988 2x2 MIMO 68.988

N/A N/A 4x4 MIMO 137.976

20MHz N/A N/A

SISO 68.988

2x2 MIMO 137.976

4x4 MIMO 275.952


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Phase Target of Other Features

FeatureHSPA+ P1

(3GPP R7 )

HSPA+ P2

(3GPP R8 )

HSPA+ P3

(3GPP

R9/R10 )

Multi-Carrier Not Supported Dual-Carriers Quad-Carriers

User-Plane Latency 20 ms 10 ms 5 ms

Control-Plane

Latency100 ms 50 ms 50 ms

VoIP Subscribers 200 400 800

MBMS 3 Mbps 5 Mbps 10 Mbps

System Architecture Ongoing Flat Flat


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HSPA+ Application Prospect

It is estimated that HSPA+ commercial application will be

launched in Q4, 2008.

Qualcomm will launch its HSPA+ chip (MDM8200) in Q2,2008.

Cingular is probably going to be the first HSPA+ operator.


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Contents






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System Architecture (3GPP R7)

Node B

Node B

Core Network

UE

IP

UE

Node B

UE

RNC

RNC Service: PS

CN: SGSN + GGSN

Topology: Centralized / Star

New UE Category:

DLCategory 1316

ULCategory 7


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System Architecture (3GPP R8/9/10)

Service: PS only

CN: SGSN + GGSN or aGW

Topology: Distributed / Mesh

New UE Category:

DLCategory 1720

ULCategory 89

Node B+

Node B+

Core Network

UE

IP

UE

Node B+

UE


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System Flat Architecture (One-Tunnel

SGSN)

In short, HSPA+ system architecture will be no impact on LTE study and

simplified in hierarchy;

In terms of CN, only keep routing and gateway function (GGSN), control

part (SGSN) will be transferred to NodeB gradually;

RNC function will be transferred to NodeB gradually;

NodeB will be evolved to E-NodeB with RNC function.


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HSPA+ Protocol Stack (3GPP R7)

L1

UE

RLC

RRC

App/TCP/

UDP/IP

MAC-ehs

L1

RLC

PDCP

App/TCP/

UDP/IP

MAC-ehs

Node BRNCSGSN/GGSN

MAC-d

MAC-d

UUIubIu-PS

RRC

PDCP

MAC-es

MAC-e MAC-e/es


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HSPA+ Protocol Stack (3GPP R8/9/10)

L1

UE

RLC

RRC

App/TCP/

UDP/IP

MAC-ehs

L1

RLC

PDCP

App/TCP/UDP/IP

MAC-ehs

Node B+SGSN/GGSN

or

aGW

MAC-d MAC-d

UUIu-PS

or

S1

RRC PDCP

MAC-e/es MAC-e/es


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Inter-working With Other System

Trusted/Untrusted*

Non- 3GPP IP Access

or 3GPP Access

SGi

PCRF

S7

S6a

HSS

ePDG

S2b

S erving

Gateway

Wn*

3GPP AAA

Server

Operators IP

Services

(e.g. IMS, PSS etc.)

Wm*

Wx*

Untrusted

Non- 3GPP IP

Access

Trusted

Non - 3GPP IP

Access Wa*

Ta*

HPLMN

Non- 3GPP

Networks

S1-U

S1-MME

EUTRAN

SGSN

S4

S3

S5S6c

Rx+

S2a

PDN

Gateway

MME

S11

S10

UE

S2c

* Untrusted non- 3GPP access requires ePDG in the data path

UE

Uu UTRAN

Iu-PS


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Contents






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HSPA+ Key Technologies

MIMO CPC

UL 16QAM

Improved

Lay-2Enhanced

CELL_FACH

DL 64QAMHSPA+

Key Tech


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MIMO (Multiple Input/Multiple Output)

Principle MIMO is aimed at multi-path wireless channel. It uses multiple transmitting/receiving antennas at the two

ends to speed date rate, decrease BER and improve QoS of radio signal.

At the side of NodeB, in HS-PDSCH channel, MIMOs application principle is listed as follows: channel

coding, interleaving and spreading are finished in non-MIMO mode; the dispatch algorithm in NodeB can

decide to transmit whether one TB or two TBs to UE in one TTI, the complex value after spreading will be

transmitted to 2 MIMO antennas and then will be through weighing process with pre-coding factor w1, w2,

w3 and w4.

Weight Generation

w1 w4

Determine weight infomessage from the uplink

w2 w3

TrCHprocessing

HS-DSCH TrCHprocessing

HS-DSCH

Spread/scramble

Ant1

Ant2

CPICH1

CPICH2

w1

w2

w3

w4

Primarytransport block

Primary: Always present for scheduled UE

Secondary: Optionally present for scheduled UE

Secondarytransport block


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DL MIMO Simulated Performance Analysis

(Indoor Scenario)

About 12.58% improvement on sector throughput in this scenario.


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DL MIMO Simulated Performance Analysis

(Micro Cell)

About 32.4% improvement over legacy HSDPA on sector throughput in

this scenario. (ISD = 500 m)


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CPCContinuous Connectivity for

Packet Data Users

HSDPA/HSUPA has always been facing challenge from fixed broadband network (DSL),

for some weak points, although it has enhanced the data speed.

latent transmission interruption

frequent connectivity termination

no-guaranteed QoS

one A-DCH (SF=256) for every UE leads code resources limitation in DL

UL interface limit more UE access

CPC is the solution to change the situation with these steps:

Replace F-DPCH (Fractional-Dedicated Physical Channel) with A-DCH to use

code resources efficiently in DL

Optimize UL DPCCH slot format with 4 bits TPC and 6bits Pilot to decrease

spending for control signaling and increase VoIP capacity

Increase PS UE number in CELL_DCH and decrease latency switching from

non-activate to activate state for PS UE

Extend the time UE in CELL_DCH state and extend UEs power usage time


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Downlink 64QAM High Order

Modulation

64QAM Constellation

101111

One symbol means 6 bits

64QAM + MIMO, DL peak

rate can reach 42Mbit/s

64QAM TX Diversity: STTD

New UE category: Category

1314

296 TB sizewhile 254 for

legacy HSDPA

Specifications about L1/L2/L3

and Iub/Iur interface will be

modified


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DL 64QAM Simulated Performance

Analysis

64QAM + 2 receiving antennas, max throughput can reach 21.6Mbps


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Compared with 16 QAM in R6, max throughput can be improved 29%

DL 64QAM Simulated Performance

Analysis


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UL 16QAM High Order Modulation

I

Q

+1 +3-1-3

I

Q

+j

+3j

-j

-3j

I

Q

For E-DPDCH only

For 2 x SF2 + 2 x SF4 only

2ms TTI only

TB size > 10782 bits, Peak data rate: 28 Mbps


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Enhanced CELL_FACH

Increase the available peak rate for UEs in CELL_FACH

state, e.g. by utilizing HSDPA in CELL_FACH state

Reduce the latency of user and control plane in the CELL_

FACH,CELL_PCH and URA_PCH state by higher data peak

rate

Reduce state transition delay from CELL_FACH,CELL_PCH

and URA_PCH state to CELL_DCH state

Allow lower UE power consumption in CELL_FACH state by

discontinuous reception


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Improved Lay-2 Support for High Data

Rate

Allow link layer support for high data rates in downlink by

Introducing support for flexible RLC PDU sizes

Introducing MAC-hs multiplexing

Introducing MAC-hs segmentation

Provide a single L2 protocol evolution for all performance

enhancements

Evaluate the necessity to support MAC-d multiplexing and

RLC concatenation

Allow smooth transition between old and new protocol formats


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Contents






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Feature Development

(System Architecture)

SGSN

GGSN

EvolvedHSPA NodeB

Evolved

HSPA NodeB

IurIu-PS

(C-plane) Gn

(C-plane)

Gn

(U-plane)

Gn

(U-plane)

SGSN

GGSN

EvolvedHSPA NodeB

Evolved

HSPA NodeB

IurIu-PS

(C-plane) Gn

(C-plane)

Gn

(U-plane)

Gn

(U-plane)

Full flat network architecture. It is helpful to reduce delay and

to ensure QoS required. PS only. CS services will be translated into PS services. VoIP

must be implemented.

Shorter TTI for HS-PDSCH / HS-SCCH / HS-DPCCH. For

example, one slot (0.667ms). New channels may be required.


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Feature Development (DL)

Combining MIMO and 64QAM

together

Multiple carriers. For example,

direct MC-WCDMA or,

employing OFDM in

associated carrier or,

employing OvFDM inassociated carrier

Higher order MIMO, eg, 4x4

SDMA

New advanced receiver forinter-carrier interference

cancellation


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MIMO, include virtue MIMO

64QAM

Multi-Carriers

I

Q

I

Q

I

Q

+ =

Feature Development (UL)


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Documents

Training Material_HSPA+ Principle