owa324030 wcdma hspa+ ran12 principles issue1.00

8/14/2019 Owa324030 Wcdma Hspa+ Ran12 Principles Issue1.00

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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA HSPA+

RAN12 Principles


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page2

About This Course

This course introduces principles and some key

technologies of HSPA+ features in RAN12 version.


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Objectives

Upon completion of this course, you will be able to:

Describe new HSPA+ features in RAN12 version.


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All the HSPA+ Features in RAN11 and

RAN12

3GPP Version HSPA+ Technology RAN Version

Release 7 Downlink Enhanced L2 RAN 11.0

2x2 MIMO RAN 11.0

Downlink 64QAM RAN 11.0

Downlink Enhanced CELL_FACH

Operation

RAN 11.0

Continuous packet connectivity

(CPC)

RAN 11.0

Uplink 16QAM RAN 12.0Release 8 Uplink Enhanced L2 RAN 12.0

Downlink MIMO+64QAM RAN 12.0

DC-HSDPA RAN 12.0


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HSPA+ in RAN11

In Huawei RAN11 version HSPA+ is introduced. The following

figure shows the features in HSPA+ RAN11 and the relations

among these features.


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HSPA+ in RAN12

Some new features for HSPA+ are introduced in RAN12 to provide

higher date rate and higher capacity. The following figure shows

the features in HSPA+ RAN12 and the relations among these

features.


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Contents

1. HSPA+ RAN12 Overview

2. Key Technologies of HSPA+ RAN12

2.1 Downlink MIMO with 64QAM

2.2 DC-HSDPA

2.3 Uplink Enhanced L2

2.4 Uplink 16QAM

2.5 HSUPA Dynamic TTI Adjustment


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Downlink MIMO with 64QAM

In RAN12 downlink MIMO and 64QAM can be used

simultaneously by one UE to receive HSDPA data. With this

technology, the theoretical downlink peak rate can reach 42

Mbps.


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HS-SCCH Type 3 for Downlink MIMO

with 64QAM HS-SCCH type 3 indicates the modulation scheme by a 3-bit field

for downlink MIMO with 64QAM, as it does for dual-stream

transmission in downlink MIMO. The used values 101, 010, and 001

are described in the following table (Other values are used for

MIMO only.).Modulation

Scheme

Primary

TB

Secondary TB Number of TBs

101 64QAM Indicated by the

last bit of CCS

Indicated by the last

bit of CCS

010 64QAM 64QAM 2

001 64QAM 16QAM 2


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UE categories for MIMO with 64QAM

UE categories 19 and 20 support MIMO with 64QAM.

HS-DSCH

category

Maximum

number of

HS-DSCH

codes

received

Minimum

inter-TTI

interval

Maximum

number of bits of

an HS-DSCH

transport block

received withinan HS-DSCH TTI

Total

number of

soft

channel

bits

Supported

modulation

s without

MIMO

operation

Supported

modulations

simultaneous

with MIMO

operation

Category

1915 1 35280 518400

QPSK, 16QAM, 64QAM

Category20 15 1 42192 518400


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Prerequisites for MIMO with 64QAM

Only PS streaming service, PS interactive service or PS

background service can be carried by MIMO, 64QAM or

MIMO with 64QAM.

The cell supports enhanced L2.

UE supports MIMO with 64QAM.

The service is carried by HSDPA.


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Requirements for equipments

To support 64QAM+MIMO feature, the required hardware

configuration of the NodeB is as follows:

BTS3900: Configure the WBBPb or WBBPd

DBS3800: Configure the EBBC or EBBCd

BTS3812E/BTS3812AE: Configure the EBBI or EDLP

Configure two RRUs with a single transmit channel or one RRU

with dual transmit channels (for example, RRU3808)

RNC: Configure the DPUe board


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Software Configuration

License Control

NodeB license control is available.

Configuration Activation

NodeB side:

Activate the configuration, run the MOD LOCELLcommand to set

DL 64QAM_MIMO Capabilityto TRUE.


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Contents




2.2 DC-HSDPA

2.3 Uplink Enhanced L2

2.4 Uplink 16QAM



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What is DC-HSDPA (Dual-cell HSDPA)?

DC-HSDPA allows a UE to set up HSDPA connections with

two inter-frequency time-synchronous cells that have the

same coverage. Theoretically, DC-HSDPA with 64QAM can

provide a peak rate of 42Mbps in the downlink.


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DC-HSDPA Basic Concepts Anchor carrier: a carrier that carries all the channels, including uplink

dedicated channels, of a UE. Each UE has only one anchor carrier.

Supplementary carrier: a carrier that carries only three types of

downlink channel of a UE. Each UE has only one supplementary

carrier. The three types of downlink channel are as follows:

HS-SCCH

HS-PDSCH

P-CPICH


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Why DC-HSDPA is used?

DC-HSDPA can improve downlink data rate. The theoretical

peak data rate with DC-HSDPA is 42Mbps.

DC-HSDPA can reduce time delay for some services such as

HTTP.

DC-HSDPA can improve the data rate in cell edge and

improve downlink coverage.

DC-HSDPA can improve the system capacity when downlinkload is unbalanced between different frequencies. The gain

is very obvious in cell edge.


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Comparison between DC-HSDPA and

MIMO If the network load is high but only one frequency is available, MIMO

can be used. If two frequencies or more are available, DC-HSDPA can

be used.Feature Advantage Disadvantage

DC-

HSDPA

DC-HSDPA has lower requirements on

signal quality, and can greatly increase

the throughput of cell edge users and

improve the DL coverage. The gain of

cell edge users is greater than the gain

of cell center users.

The system capacity gain is smaller

than that of MIMO. In addition, the

system capacity gain decreases along

with the growth of user number.

MIMO The system capacity gain is higher than

that of DC-HSDPA.

MIMO has a high requirement on

signal quality, and does not increase

the rate of cell edge users obviously.


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Some restrictions of DC-HSDPA

DC-HSDPA is used only on downlink HS-DSCH.

The anchor-carrier cell and the supplementary-carrier cell

must belong to the same NodeB and must be inter-frequency

same-coverage neighboring cells with a frequency spacing of5 MHz. In addition, they use different downlink scrambling

codes.

The anchor and supplementary carrier cells are synchronous

in time, that is, Tcell of the two cells is the same.

Same Tcell means two frequencies are synchronous.


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DC-HSDPA impact on HS-DPCCH

For DC-HSDPA user, ACK/NACK and CQI feedback for two

frequencies are independent. They are carried by HS-

DPCCH only in anchor carrier.


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DC-HSDPA impact on HS-SCCH

In releases earlier than 3GPP Release 8, a UE can monitor a

maximum of four HS-SCCH at the same time.

For DC-HSDPA, HS-SCCH channels in different frequencies

are independent. They indicate the HSDPA datatransmission in corresponding frequency. A UE can monitor

a maximum of six HS-SCCH at the same time. In each cell,

the UE can monitor a maximum of three HS-SCCHs at the

same time.


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DC-HSDPA impact on MAC layer

MAC-ehs

in NodeB

MAC Control

TFRCselection

Flow ControlMAC-ehs / MAC-c/sh or MAC-ehs

to MAC-c/sh or MAC-d

HARQ

TFRCselection

HARQ

Scheduling/Priority Handling/LCH-ID

mux/Segmentation

HS-DSCH AssociatedDownlinkSignalling

AssociatedUplink

Signalling

HS-DSCH AssociatedDownlinkSignalling

AssociatedUplink

Signalling

Before R8, there is only

one HARQ entity in MAC-

ehs. In R8, there are two

HARQ entities in MAC-

ehs for DC-HSDPA

operation. Everyfrequency needs one

HARQ entity.


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UE categories for DC-HSDPA

UE categories 21, 22, 23 and 24 support DC-HSDPA.

HS-DSCH

category

Maximum

number of

HS-DSCH

codes

received

Minimum

inter-TTI

interval

Maximum

number of bits

of an HS-DSCH

transport block

received withinan HS-DSCH TTI

Total

number

of soft

channel

bits

Supported

modulations

with dual cell

operation

Category 21 15 1 23370 345600 QPSK,

16QAMCategory 22 15 1 27952 345600

Category 23 15 1 35280 518400 QPSK,

16QAM,

64QAMCategory 24 15 1 42192 518400


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Prerequisites for DC-HSDPA

Only PS streaming service, PS interactive service or PS

background service can be carried by DC-HSDPA.

The cell supports downlink enhanced L2.

UE supports DC-HSDPA.

The service is carried by HSDPA.


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To support DC-HSDPA feature, the required hardware


BTS3900: Configure WBBPb or WBBPd


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License Control



NodeB side:

Configure the a local DC group , runADD DUALCELLGRP

RNC side:

Enable the DC-HSDPA switch, run SET CORRMALGOSWITCH:

CfgSwitch=CFG_HSDPA_DC_SWITCH-1

When both DC+64QAM and MIMO+64QAM are supported, to set the preference

to DC-HSDPA, run SET FRC: MIMOorDcHSDPASwitch=DC-HSDPA-1

Activate the 42M license to make the DL peak rate exceed 28 Mbit/s, run ACT

LICENSE: ISPRIMARYPLMN=YES,

FUNCTIONSWITCH4=HSPA_DOWN42_PER_USER-1


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Uplink Enhanced L2

Uplink enhanced L2 allows flexible PDU sizes at the RLC

layer and segmentation at the MAC layer on the Uu interface.

The feature improves the uplink transmission efficiency.

336bits 656bits

uplink fixed RLC PDU size

uplink flexible RLC PDU size

Before R8

R8


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New MAC entities for UL enhanced L2

MAC i/is replaces MAC e/es to support UL enhanced L2.

MAC-d

MAC-is

E-DCH FP

TNL

MAC-i

TNLPHY

E-DCH FP

MAC-d

MAC-is

/MAC-i

PHY

DCCHDTCH

UE

DCCHDTCH

NodeBUu SRNCIub


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To support UL enhanced L2 feature, the required

hardware configuration of the NodeB is as follows:

BTS3900: Configure the WBBPb or WBBPd


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License Control



NodeB side:

Activate the configuration, run the MOD LOCELLcommand and set

L2 Enhancementto TRUE.


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Contents




2.2 DC-HSDPA2.3 Uplink Enhanced L2

2.4 Uplink 16QAM



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Uplink 16QAM Introduction

Uplink 16QAM modulates 4 bits/symbol whereas the original

QPSK modulates only 2 bits/symbol. As a result, it doubles

the HSUPA data rate to 11.5Mbps at the physical layer.

HSUPA 16QAM allows more bits per

Symbol to be transmitted


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Technical Characteristics

In the case of 16QAM, a gain is achieved only when the

signal-to-noise ratio (SNR) is high. Therefore, a good

channel environment is required, for example, a cell with

good indoor coverage or micro coverage.

In comparison with QPSK, a gain is achieved only when

16QAM is used after the UL rate reaches 4Mbps. Therefore,

the UL 16QAM is configured only after the maximum bit rate

(MBR) exceeds 4Mbps.


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UE categories for UL 16QAM

UE category 7 supports UL 16QAM.

E-DCH

category

Maxim

um

numbe

r of E-

DCH

codes

trans

mitted

Minim

um

sprea

ding

factor

Support

for 10

and 2 ms

TTI

EDCH

Maximum number

of bits of an E-

DCH transport

block transmitted

within a 10 ms E-

DCH TTI

Maximum number

of bits of an E-

DCH transport

block transmitted

within a 2 ms E-

DCH TTI

Category 7 4 SF2 10ms and

2 ms TTI

20000 22996


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To support UL 16QAM feature, the required hardware


BTS3900: Configure the WBBPd

.


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License Control



NodeB side:

Activate the configuration, run the MOD LOCELLcommand to

enable local cells to support UL 16QAM


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Contents




2.2 DC-HSDPA2.3 Uplink Enhanced L2

2.4 Uplink 16QAM



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HSUPA Dynamic TTI Adjustment

Introduction HSUPA TTI can be 2 ms or 10 ms. When the TTI is 2 ms,

higher throughput can be achieved. When the TTI is 10 ms,

wider coverage can be achieved. The HSUPA TTI selection

feature can change the TTI from 2 ms to 10 ms for wider

coverage or from 10 ms to 2 ms for higher throughput. In this

way, call drops are reduced and the quality of service (QoS)

is ensured.


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Dynamic TTI Adjustment for Voice

Service over HSUPA For voice service over HSUPA, 2ms TTI can support bigger

capacity while 10ms TTI can support better coverage.

TTI=10ms

better coverageTTI=2ms

bigger capacity


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Dynamic TTI Adjustment for BE

Service over HSUPA

For BE service over HSUPA, 2ms TTI can support higher

throughput while 10ms TTI can support better coverage.

TTI=10ms

better coverageTTI=2ms

higher throughput


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Summary

To increase higher data rate and higher system throughput.

Some new features for HSPA+ are introduced in RAN12.

UL enhanced L2 and UL 16QAM can improve uplink data

rate and uplink capacity.

MIMO with 64QAM and DC-HSDPA can improve downlink

data rate and downlink capacity.

Dynamic HSUPA TTI adjustment can get balance betweenuplink high throughput and continuous coverage.


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owa324030 wcdma hspa+ ran12 principles issue1.00

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