Huawei MIMO Solution PDF

 

Huawei MIMO solution

  HUAWEI TECHNOLOGIES CO., LTD.

 

Contents

Highlights of Huawei MIMO Solution

MIMO Trial Result

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Page 2

 

LTE MIMO and Beamforming Mode SFBC

SM

Low si gnal qua qualit lity; y; moving UE •

Sending same but differently coded info on each of the antennas

•

Pre-coded Rank 1 Low si gnal qua qualit lity; y; stat static ic UE

Good s ig nal qua quality; lity; moving moving UE •

SM Pre-coded Rank 2

To transmit separately encoded

•

G ood sig nal nal qualit quality; y; stat static ic UE

Use of a pre-coded matrix (PMI.

data signals (streams), from each

Pre-Coded Matrix Index) at the Tx

of Tx antennas

side to reduce the effect from interference and noise;

Based on N times different signal coding (the same PRB

•

is sent across all antennas)

•

To transmit separately encoded data signals (streams), from each of Tx antennas;

•

Use of a pre-coded matrix (PMI. Pre-

UE computes PMI and sends to

Coded Matrix Index) at the Tx side to

eNodeB (C Matrix)

reduce intra-cell interference and noise; •

UE computes PMI and sends to eNodeB (C Matrix)

PRB1

One can easily extend the SFBC principle with 2 or 4 antennas at the

Each PRB is sent 2 times across 2 antennas AND AND each  each sub-carrier contains 2 times more

UE side.

coded information than SFBC case.

  e   r   a   s    B  s    R  e    P  m   e   i    t    2   m   a   d   s   e   e   d    h   c PRB1    T   o

To combine Rx signals

PRB1

Tx signal depending on the channel info To combine Rx signals PRB1

pre-coding code-books (PMI)

PRB1

MCX CX CX

MCX

PRB1 PRB1

Tx

To combine Rx signals

eNB Tx signal

PRB1

UE Rx signal=

Tx

Rx HUAWEI TECHNOLOGIES CO., LTD. HISILICON S EMICONDUCTOR EMICONDUCTOR

Rx Channel Matrix (UE)

Rx

-1

M MX

Pre-coded based on CQI info (C Matrix from UE)

eNB Tx signal

UE Rx signal= Page 3 Page 3

-1

-1

C M MCX

Pre-Coded Matrix Index (UE sending to eNB)

Tx

Rx

Tx

Rx

 

Downlink 4x2 MIMO 4-Element Transmitters/sector

DL 2*2 MIMO

17%  Increase 17%

DL 4*2 MIMO 2-Element Receivers

   )   s   p    b    M    (    t   u   p    h   g   u   o   r

18M* 15.4M*

   T    h

23% 23%  Increase

UE

0.48M* Average Sector Throughput

eNodeB

0.59M*

Cell Edge User Throughput

* Simulation config: 10MHz, Close-Loop Adaptive MIMO mode

Description:   Description: • For DL 4*2MIMO, eNodeB need 4-antenna transmitters per sector.

Benefit:   Benefit:

UE need 2 antennas. •

DL 4x2 MIMO improves downlink cell/user throughput and coverage

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Downlink 4x4 MIMO

Description:

4*4 Channel Matrix •

Pre-coding •

Data Stream

Adaptive MIMO supported

Benefits:  Benefits: 

Stream 1

S/P

4×4 channel matrix can support up to 4 data stream to 1 UE simultaneously.

•

54% higher average higher average throughput than 4 ×2 SU-MIMO  SU-MIMO 

•

55-66% higher cell higher cell edge throughput than 4 ×2 SU-MIMO

•

Cell/UE Peak throughput 300Mbps

UE Receiver

Stream 2

Notes 4 Tx integrate RRU is required for commercial deployment

Channel Information Feedback

•  The Average sector SE (bps/Hz)

•  5% User SE (bps/Hz)

3

0.1 0.09

2.5

0.08

2 1.5 1 0.5 0

Case1

500m,

3km/h)

Case3  1732m, 3km/h)

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DL 2x2 MIMO

CL-

DL 4x2 MIMO

CL-

DL 4x4 MIMO

CL-

0.07 0.06 0.05 0.04 0.03 0.02 0.01 0

Case1

Case3

 500m, 3km/h)

  1732m, 3km/h)

Page 5

DL

2x2

CL-MIMO

DL

4x2

CL-MIMO

DL

4x4

CL-MIMO

 

Huawei MIMO support for LTE Uplink MU-MIMO

Rx diversity • •

•

Assuming two Rx antennas are configured in eNodeB,

All received information are exploited by

the eNodeB measures the UE UL channel CQI and

combining copies of the signal from all the

channel orthogonally with another UE. If both UEs have

antennas

good CQI and good channels orthogonality among each

Including Interference Rejection Combining

other, then MU-MIMO can be used, otherwise 2-Antenna

(IRC) for UL inter-cell interference suppression;

Rx Diversity is used. •



Interfering  UE Interfering



UE0

IRC tries to nullify strong interference thus maximize the SINR - A receiver beam with high attenuation in the direction of interference

eNB1

Beamforming dominated by SINR maximization

Multiple users transmit at the same time and frequency

IRC Outperforms MRC in scenario;

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interference limited

 

Uplink 4-Antenna Receive Diversity UL 2-Antenna Receivers UL 4-Antenna Receivers 4-antennas/sector

   )   s   p    b    M    (    t   u   p    h   g   u   o   r    h

35%  Increment 35%

52%  Increment 52%

11.3M* 8.4M*

   T

0.42M* Cell Average Throughput

0.64M*

Cell Edge User Throughput

* Simulation configuration: 10MHz, MRC.

Description:  Description: 

Benefit:  Benefit: 

• For UL 4-Antenna Receive Diversity, eNodeB should have

• UL 4-antenna improves receiver sensitivity

4 antennas per sector for receiving. There is no special

and uplink coverage.

requirements on UEs.

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Page Page 77

 

Advanced Receiver  – Adapti  Adaptive ve IRC Receiver Interfering

Victim cell

In interference limited environment (FER=1.00e-2): 1x2 IRC vs MRC: 6.5dB 1x4 IRC vs MRC: 15 dB IRC 1x4 vs vs 1x2 : 15 dB Interfering cell

• IRC uses the spatial characteristics of inter-cell

interference DL and UL • Huawei LTE LTE receivers are based on IRC

Benefits: • IRC enhances both system throughput and cell edge

performance

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Uplink Multi-User MIMO MU-MIMO decoding

2*4 Channel Matrix

Description: Data Stream UE 1 Data

•

UE 1

UE2 Data

Two UE to simultaneously si multaneously share the same time and frequency resources, and at the same time allowing UL Receive Diversity

Data Stream UE 2

•

Su Supp ppor orti ting ng both both 2 2 M MUU-MI MIMO MO and and 2 4 MU-MIMO.

Combined virtual UE with 2 Tx antennas

Benefits:  Benefits:  Cell uplink peak throughput doubled.  doubled.  •

•

2 4 MU MU-MI -MIMO MO(I (IRC RC): ): 15% higher 15% higher average  average throug throughpu hputt tha than n 1 4 SIMO SIMO(IR (IRC) C)

Page 99 Page

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Adaptive MIMO Scheme    )   y    t    i   c

Open Loop

   l   o   e    V   y    t    i    l    i    b   o    M

DL:OL-SM UL:MU-MIMO

DL:SFBC UL:Rx Diversity

Closed Loop DL:CL-SM UL:MU-MIMO

DL:CL-Tx Diversity UL:Rx Diversity Channel Quality (SINR)

Hig h speed m move ove U UE E

Cell edge

Cell center

user’s velocity  velocity 

Low s peed peed move U UE E

Open Loop

Close Loop Cell edge

Cell

Cell

Benefits:

edge

center

• Different MIMO modes fit different scenarios

Rx diversity

MU-MIMO

SM

Rank 1

Rank 2

• SFBC and CL (rank=1) increase link reliability and coverage • OL SM and CL (rank=2) increase throughput

Cell enter SFBC: Space Frequency Block Code

SFBC

Description: •  Adjust MIMO mode according to channel condition and

UL Scheme

DL Scheme

daptive MIMO

SM: Space Multiplexing

•

10% higher 10%  higher average system throughput than non-adaptive MIMO.

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Page 10 10 Page

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MIMO/Multi-Antenna Tech Evolution DL = Downlink; UL = Uplink; MU = Multi-user; SIC = Successive Interference Cancellation

Released Ready for Contract Planned Planning

eRAN6.0 • Advanced receiver

eRAN3.0

• DL MU-MIMO

• SIC

eRAN2.2  DL 4  UL

eRAN2.0/2.1

4 MIM MIMO O

2 4 MU MU-M -MIM IMO O

 Intra-eNB

UL-CoMP

4x2/2 2 2MIM 2MIMO O /U /UL L 2 2M 2MUU-MI MIMO MO • DL 4x2/ • Adaptive MIMO • UL Adaptive 2Rx/4Rx Diversity

2010Q2

2011Q3

2012Q1

2013Q1

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Contents

Highlights of Huawei MIMO Solution

MIMO Trial Result

Page 11

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LTE MIMO NGDI Field Trial in Madrid on 2x2 MIMO   Objectives:    Veriify

the MIMO performance in the field

Trial Results:  With

OL MIMO, the MIMO mode can be automatically set to proper mode to get higher performance;

 With

Adaptive OL-CL MIMO, the MIMO mode can be automatically set according according to the various wireless conditions;

Observations:   Terminal

measurement have effect on

the performance of CL-MIMO

Field Trial network in Madrid

Page 13 13 Page

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LTE UL 4R Diversity Receiver field test UL 2R

Mbps 25 20 15 10 5

4R has more gain vs 2R in cell edge

4R LTE site deployed in Madrid SINR( 4R vs 2R, I RC-70%Load RC-70%Load)-outdoo )-outdoor r

UL 4R 28 26 24 22

            )            B             d             (            R            N            I            S

20 18 16

4R vs R gain in cell edge： ～6dB

14 12 10

-120

-110

-100

-90

-80

-70

-60

DL-RSRP(dBm) SINR-2R-IRC-70%Load SINR-4R-IRC-70%Load SIN NR R - 2R 2R - I IR R C -7 -7 0 %L %L o ad ad

S I NR NR - 4 4R R _ IR IR C -7 -7 0 % %L L o ad ad

1. More than 3dB practical gain to improve 35% cell average throughput with 4R 4R vs 2R on uplink; 2. 4R+IRC brings more gain( reach 4~6dB) over 2R in cell edge area;  

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Intra-eNodeB UL CoMP

Throughput Gain (CoMP vs LTE) 9

LTE

Co MP MP

8

7

6

       )      s      p5        b        M        ( 4        P        T 3

2

1

0

S in in g gll e In In te t1e rf rfe re re nc nc e

Feature: 



UL signals can be received by 2 co-sited cells and combined to achieve better UL coverage especially for the cell border UE; No additional RF unit and X2 backhauling required except more capacity required in baseband board

M ul ul ti ti -I -I nt nt er er fe fe re re nc nc es es

Benefits: 



LTE is typically UL limited and intra-eNB UL CoMP is a cost efficient way to improve the UL coverage; For cell border UE, filed trial results showed 61.5% and 146.4% throughput gain with single and multiple interferences respectively

Page 15

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Thank you

www.huawei.com   www.huawei.com

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The Factors influence on MIMO performance Transmission/Receiver

channel number The correlation of wireless channel (low/mid/high correlation) The

antenna type  – cross polarization / parallel polarization

The

performance of adaptive MIMO algorithm in variety wireless scenario (e.g. the

properly selection of pre-coding matrix in CL MIMO) Terminal  UE

capability (receive sensitivity & measurements accuracy)

performance (e.g. measurement (CQI,PMI) accuracy)