Asset LTE - Slides- Robi

8/9/2019 Asset LTE - Slides- Robi

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1 2012 AIRCOM International Ltd

Asset Tool User for LTE

by Ishan Marwah


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LTE Frequency Bands


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Supported Channels (non-overlapping)E-UTRA

Band

Downlink

Bandwidth

Channel Bandwidth (MHZ)

1.4 3 5 10 15 20

1 60 - - 12 6 4 3

2 60 42 20 12 6 4* 3*

3 75 53 23 15 7 5* 3*

4 45 32 15 9 4 3 2

5 25 17 8 5 2* - -

6 10 - - 2 1* X X

7 70 - - 14 7 4 3*

8 35 25 11 7 3* - -

9 35 - - 7 3 2* 1*

10 60 - - 12 6 4 3

11 25 - - 5 2* 1* 1*

12 18 12 6 3* 1* - X

13 10 7 3 2* 1* X X

14 10 7 3 2* 1* X X

...

33 20 - - 4 2 1 1

34 15 - - 3 1 1 X

35 60 42 20 12 6 4 3

36 60 42 20 12 6 4 3

37 20 - - 4 2 1 138 50 - - 10 5 - -

39 40 - - 8 4 3 2

40 100 - - - 10 6 5

* UE receiver sensitivity can be relaxed

X Channel bandwidth too wide for the band

- Not supported

LTE Frequency Bands


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E-UTRA

Band

Bandwidth

UL (MHz)

E-ARFCN

UL

Bandwidth

DL (MHz)

E-ARFCN

DL

Duplex

Mode

1 1920-1980 13000

13599 2110-2170 0

599 FDD2 1850-1910 13600 14199 1930-1990 600 - 1199 FDD

3 1710-1785 14200 14949 1805-1880 1200 1949 FDD

4 1710-1755 14950 15399 2110-2155 1950 2399 FDD

5 824-849 15400 15649 869-894 2400 2649 FDD

6 830-840 15650 15749 875-885 2650 2749 FDD

7 2500-2570 15750 16449 2620-2690 2750 3449 FDD

8 880-915 16450 16799 925-960 3450 3799 FDD

9 1749.9-1784.9 16800 17149 1844.9-1879.9 3800 4149 FDD

10 1710-1770 17150 17749 2110-2170 4150 4749 FDD

11 1427.9-1452.9 17750 17999 1475.9-1500.9 4750 4999 FDD

12 698-716 18000 18179 728-746 5000 5179 FDD

13 777-787 18180 18279 746-756 5180 5279 FDD

14 788-798 18280 18379 758-768 5280 5379 FDD

...

33

1900-1920 26000 26199 1900-1920 26000 26199 TDD

34 2010-2025 26200 26349 2010-2025 26200 26349 TDD

35 1850-1910 26350 26949 1850-1910 26350 26949 TDD

36 1930-1990 26950 27549 1930-1990 26950 27549 TDD

37 1910-1930 27550 27749 1910-1930 27550 27749 TDD

38 2570-2620 27750 28249 2570-2620 27750 28249 TDD

39 1880-1920 28250 28649 1880-1920 28250 28649 TDD

40 2300-2400 28650 29649 2300-2400 28650 29649 TDD

LTE Frequency Bands


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Frame Structures


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LTE Frame Structure


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Frame Structures -TDD

0 1 2 3 19

10 ms


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Frame Structures -TDD


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Frame Structures -FDD

0 1 2 3 19

One Sub-frame = 1 mS

10 ms

In half-duplex FDD operation, the UE

cannot transmit and receive at the same

time, while there are no such restrictions in

full-duplex FDD


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Frame Structures - FDD


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LTE Carriers


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LTE CarriersSupported Channels (non-overlapping)

E-UTRA

Band

Downlink

Bandwidth

Channel Bandwidth (MHZ)

1.4 3 5 10 15 20

1 60 - - 12 6 4 3

2 60 42 20 12 6 4* 3*

3 75 53 23 15 7 5* 3*

4 45 32 15 9 4 3 2

5 25 17 8 5 2* - -6 10 - - 2 1* X X

7 70 - - 14 7 4 3*

8 35 25 11 7 3* - -

9 35 - - 7 3 2* 1*

10 60 - - 12 6 4 3

11 25 - - 5 2* 1* 1*

12 18 12 6 3* 1* - X

13 10 7 3 2* 1* X X

14 10 7 3 2* 1* X X

...

33 20 - - 4 2 1 1

34 15 - - 3 1 1 X

35 60 42 20 12 6 4 3

36 60 42 20 12 6 4 3

37 20 - - 4 2 1 1

38 50 - - 10 5 - -

39 40 - - 8 4 3 2

40 100 - - - 10 6 5

* UE receiver sensitivity can be relaxed

X Channel bandwidth too wide for the band

- Not supported

Bandwidth

(MHz)1.4 3 5 10 15 20

# of RBs 6 15 25 50 75 100

Subcarriers 72 180 300 600 900 1200

Since the appropriate LTE Frequency

Band and LTE Frame Structure havebeen selected or defined then the

Carriers can be defined

Assign Carrier to Frequency Band


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LTE Carriers


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LTE Carriers


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E-UTRA

Band

Bandwidth

UL (MHz)

E-ARFCN

UL

Bandwidth

DL (MHz)

E-ARFCN

DL

Duplex

Mode

1 1920-1980 13000 13599 2110-2170 0 599 FDD

LTE Carriers


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10

Mhz

10mhz

LTE Carriers


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Bandwidth (MHz) 1.4 3 5 10 15 20

# of RBs 6 15 25 50 75 100

Subcarriers 72 180 300 600 900 1200

LTE - Carriers


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R0

R0

R0 R0

R0

R0

R0

R0

R0

R0

R0 R0

R0

R0

R0

R0

R0

R0

R0 R0

R0

R0

R0

R0

R0

R0

R0 R0

R0

R0

R0

R0

LTE Carriers


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R0

R0

R0 R0

R0

R0

R0

R0

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

Configuration of

Carrier-2 antenna

LTE Carriers


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Downlink reference

signal structure

The downlink reference

signal structure is

important for channel

estimation.

The principle of the

downlink reference

signal structure for 1

antenna.

Ref Signal TX1 = 8 for

15Khz spacing

R0

R0

R0 R0

R0

R0

R0

R0

Specific pre-defined resource elements (indicated

by R0-3 in in the time-frequency domain) are

carrying the cell-specific reference signal

sequence.

Configuration of Carrier - 1 Antenna


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Downlink reference

signal structure

The downlink

reference signal

structure is important

for channel estimation.The principle of the

downlink reference


antenna.

Ref Signal TX2= 16 for

15Khz spacing

R0

R0

R0 R0

R0

R0

R0

R0

R1 R1

R1

R1 R1

R1 R1

R1

Specific pre-defined resource elements (indicated by

R0-3 in in the time-frequency domain) are carrying

the cell-specific reference signal sequence.

Configuration of Carrier- 2 Antennas


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Downlink reference

signal structure

The downlink

reference signal

structure is important

for channelestimation.

The principle of the

downlink reference


antenna.

Ref Signal TX3= 20

for 15Khz spacingSpecific pre-defined resource elements (indicated by

R0-3 in in the time-frequency domain) are carrying

the cell-specific reference signal sequence.

Configuration of Carrier- 3 Antennas

R0

R0

R0R0

R0

R0

R0

R0

R1 R1

R1

R1 R1

R1 R1

R1

R2

R2

R2

R2


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FDD Frame Structures UL

Type1-FDD- Uplink

UL Contro l Channel

PUCCH transmission in one subframe is compromised of

single PRB at or near one edge of the system bandwidth

followed by asecond PRB at or near the opposite edge of

the bandwidth

PUCCH regions depends on the system bandwidth. Typicalvalues are1, 2, 4, 8and16for1.4, 3, 5, 10 and20 MHz

UL Sign als(S-RS & DM RS)

S-RS estimates the channel quality required for the UL

frequency-selective scheduling and transmitted on 1symbol

ineachsubframe

DM-RS is associated with the transmission of UL data on

the PUSCH and\or control signalling on the PUCCH

Mainly used for channel estimation for coherent

demodulation

Transmitted on 2symbols in eachsubframe


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Type1 - UL Frame


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Setting the Overhead Parameters After you have set the frequency parameters in the LTE Carriers dialog box,

you can set the parameters on the Overhead tab. This tab enables you todefine the associated fixed and variable signalling and control channeloverhead of each carrier.

LTE Frames are two-dimensional (time and frequency) entities, containingvarious signalling and control channels. Each of these signals/channelsoccupy a certain amount of Resource Elements (REs) in both the uplink anddownlink. In the downlink, the amount of occupied resources for certainchannels also depends on the number of transmit antennas deployed.


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Site Data Base


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ECGI


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Bearers


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LTE Bearers


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The Default Uplink and

Downlink LTE bearersare defined per CQI

providing 15 DL

bearers and 4 UL

bearers.

CQI is a report sent

from the UE to the

eNodeB suggesting

the appropriate

Modulation and

Coding to be used by

the eNodeB.

Downlink

Uplink

LTE Bearers


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Channel Quality Indicator Reporting

CQI Report

PUSCH PUCCH

PDSCH

The UE may not have

PUSCH resources

CQI Modulation Actual

coding rate

Required

SINR

1 QPSK 0.07618 -4.46

2 QPSK 0.11719 -3.75

3 QPSK 0.18848 -2.55

4 QPSK 308/1024 -1.15

5 QPSK 449/1024 1.75

6 QPSK 602/1024 3.65

7 16QAM 378/1024 5.2

8 16QAM 490/1024 6.1

9 16QAM 616/1024 7.55

10 64QAM 466/1024 10.85

11 64QAM 567/1024 11.55

12 64QAM 666/1024 12.75

13 64QAM 772/1024 14.55

14 64QAM 873/1024 18.15

15 64QAM 948/1024 19.25

Each default Bearers has

Control & Traffic SINR

requirements according to


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15 Default

Bearers

CQI Modulation Actual

coding rate

Required

SINR

1 QPSK 0.07618 -4.46

2 QPSK 0.11719 -3.75

3 QPSK 0.18848 -2.55

4 QPSK 308/1024 -1.15

5 QPSK 449/1024 1.75

6 QPSK 602/1024 3.65

7 16QAM 378/1024 5.2

8 16QAM 490/1024 6.1

9 16QAM 616/1024 7.55

10 64QAM 466/1024 10.85

11 64QAM 567/1024 11.55

12 64QAM 666/1024 12.75

13 64QAM 772/1024 14.55

14 64QAM 873/1024 18.15

15 64QAM 948/1024 19.25

Channel Quality Indicator Reporting


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Bearers

S is the average

received signalpower, I is the

average interference

power, and N is the

noise power.


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TDD


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TDD


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Uplink Bearers


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Uplink

UL 16QAM

UL 64QAMSINR=+12.75


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Uplink


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Limiting the Service Area


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MIMO


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Single User MIMO Principle4 Closed-loop spatial multiplexing

Here the UE reports both the RI and index of the preferred pre-coding matrix.

Rank Indicator (RI) is the UEs recommendation for the number of layers, i.e.

streams to be used in spatial multiplexing. RI is only reported when the UE is

operating in MIMO modes with spatial multiplexing

Spatial Multiplexing does

increase throughput butthis comes at an expense

of higher SINR

requirements as shown on

the LTE bearers


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Multi User MIMO

MU-MIMO is used to

increase the cells

throughput.

This is achieved byco-scheduling

terminals on the same

Resource Blocks.

Spatial Multiplexing does increase throughput but this comes at the

expense of higher SINR requirements, as shown on the LTE bearers


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Multi User MIMO

Applying MU-MIMO

will make no obviouschanges to a network

unless it is overloaded

In order for MU-MIMOto be used, there is a

higher Traffic &

Control SINR

requirement defined

Spatial Multiplexing does increase throughput but this comes at the

expense of higher SINR requirements, as shown on the LTE bearers


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Single User MIMO Principle

SU-MIMO Tx DiversitySU-MIMO

+22dB DLRS SNR

Roughly speaking, Diversity is used to

improve coverage

This is the coverage area

for SU-MIMO

Spatial Multiplexing

does increasethroughput but this

comes at the

expense of higher

SINR requirements

as shown on the

LTE bearers


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Cell in Site Database(AAS Settings tab)

Look-Up Table(Tab Name)

Clutter Parameters(Column name)

MIMO SINR DeltaOffset on Bearer

How a Simulation of NetworkPerformance is Affected

SU-MIMO - Diversity(downlink)

DL SD SINRAdjustment

DL SD SINRAdjustment

- Required DL SINR is dividedby thecorresponding table value.*

SU-MIMO - Diversity(uplink)

UL SD SINRAdjustment

UL SD SINRAdjustment

- Required UL SINR is dividedby thecorresponding table value.*

SU-MIMO - Multiplexing(downlink)

DL SM Rate Gain DL SM Rate GainAdjustment

- Achievable User Data Rate is multipliedby the corresponding table value.*

- DL SM SINR Offsets SINR Delta for SU-MIMO

Required SINR is adjusted by thespecified delta value.*

SU-MIMO - Multiplexing(uplink)

UL SM Rate Gain UL SM Rate GainAdjustment

- Achievable User Data Rate is multipliedby the corresponding table value.*

- UL SM SINR Offsets SINR Delta for SU-MIMO

Required SINR is adjusted by thespecified delta value.*

SU-MIMO - AdaptiveSwitching (uplink and/or

downlink)**

All or any of the above, depending on channel conditions, and/or the cell-specific thresholds, if enabled.

MU-MIMO (uplink and/ordownlink)** - DL MU-MIMO SINROffsets and

UL MU-MIMO SINROffsets

SINR Delta for MU-MIMO The number of served terminals isincreased by the factor specified in theAverage Co-scheduled Terminals.

Also, Required SINR is adjustedby thespecified delta value on the bearer.*

How AAS Support Affects Simulations


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AAS Settings in Site DB


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Enabling AAS Support for LTE Cells MU-MIMO Support

This is an example of the MU-MIMO settings:

For the downlink and/or uplink, you can set the Average

Co-scheduled Terminals, a factor that can increase thenumber of served terminals.


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How do we set this up in ASSET?

B LTE P t


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Bearers - LTE Parameters

SU-MIMO DiversitySU-MIMO

+22dB

Above this threshold

switch to SU-MIMO

Below this threshold

switch to SU-MIMO

Diversity

If enabled

DL T i i M d


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DL Transmission Mode

Switches on DLRS SNR


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Services


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Introduction

QoS differentiation (i.e. prioritisation of different services

according to their requirements) becomes extremely

important when the system load increases

The most relevant parameters of QoS classes are:

Transfer Delay

Guaranteed Bit rate

Delay sensitive QoS Classes have guaranteed bit rate

requirements.


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Services

When running a simulation,

ASSET first attempts to servethe GBR demands of both

Real Time and Non-Real Time

services, taking into account

the Priority values of the

different services.

Resources are first allocated to

the service with the highest

priority, and then to the next

highest priority service, and so

on.

Allocation and Retention Priority (ARP)

If resources are still available after the GBR demands have been met, then

different scheduling algorithms can be employed to attempt to serve the MBR of

real time services.


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LTE QoS


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LTE Services Bearer Selection Method


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ServicesWhen running

a simulation,

ASSET first

attempts to

serve the GBR

demands of

both Real Time

and Non-Real

Time services,

taking into

account the

Priority values

of the different

services.

After defining the General Service Parameters one or more Carriers can be related

to the Service. Since a supporting Carrier has been assigned to the Service, all UL

and DL Bearers will be available for selection as the Supporting Bearers.

No carrierdefined OR

BEARER


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Services

A Minimum Bit Rate (Min-GBR) and a Maximum Bit Rate (Max-MBR) have beenspecified for the service.

If a terminal achieves connection to one or more of the available bearers, the

eNodeB will firstly allocate enough resources to it in order to achieve Min-GBR.

It will keep allocating more resources to it until the terminal either reaches theMax-MBR ceiling, or until there not more resources available due to cell loading.


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The Default Uplink and Downlink LTE bearers are defined per CQI providing 15 DL

bearers and 4 UL bearers.

The most preferable bearer is DL-CQI-15 and the least preferable bearer is DL-CQI-1

LTE Bearers


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Services

The Default Uplink and Downlink LTE

bearers are defined per CQI providing 15

DL bearers and 4 UL bearers


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Services

The Default Uplink and Downlink LTE

bearers are defined per CQI providing 15

DL bearers and 4 UL bearers


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Services

After defining the General Service Parameters, one or more Carriers can be

related to the Service. Since a supporting Carrier has been assigned to the

Service, all UL and DL Bearers will be available for selection as the Supporting

Bearers.


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TerminalTypes

Terminal Types


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Terminal Types


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Terminal Types


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Terminal Types


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Traffic Raster


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Packet Scheduler


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Packet Scheduler

d bi h d l


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UE 1 Data

sent

UE 2 Data

sent

UE 1

UE 6

UE 5

UE 4

UE3

UE 2

UE 3 Data

sent

UE 4 Data

sent

UE 5 Data

sent

UE 6 Data

sent

UE 1 Data

Request

UE 2 Data

Request

UE 3 data

Request

UE 4 Data

Request

UE 5 Data

Request

UE 6 Data

Request

NodeB Packet

Scheduler

Round Robin Scheduler

NodeB Buffers

The aim of this

scheduler is to

share the

available/unusedresources equally

among the RT

terminals

The Round Robin approach is completely

random, as it simply allocates the same

resources to all terminals in turns

P i l F i


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Proportional Fair

If resources are still available after GBR demandshave been met:

Terminals with higher data rates get a larger

share of the available resources Each terminal gets either the resources it needs

to satisfy its RT-MBR demand or its weightedportion of the available/unused resources,whichever is smaller

P ti l D d


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Proportional Demand

The aim of this scheduler is to allocate the remaining

unused resources to RT terminals in proportion to their

additional resource demands.

If resources are still available after the GBR demands have

been met:

Proportional Demand completely ignores RF conditions

M SINR


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Max SINR

Terminals with higher bearer rates(and consequently higher SINR) are preferred

over terminals with lower bearer rates (and consequently lower SINR).

This means that resources are allocated first to those terminals with better

SINR/channel conditions, thereby maximising the throughput.

where S is the average received signal

power,

I is the average interference power,

and N is the noise power.

Best RF conditions are served first.

M SINR


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Max SINR

Own-signal interference in LTE an occur due to :

Inter-symbol interference due to multipath power exceeding cyclic prefixlength

Inter-carrier interference due to Doppler spread (large UE speed)

In LTE, orthogonality is often assumed unity for simplicity:

a = 1 is assumed for LTE and hence Iown = 0.

where S is the average received signal

power,

I is the average interference power,

and N is the noise power.

Best RF conditions are served first.


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Simulating Network Performance

M t C l B d Si l ti


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Monte Carlo-Based Simulation

When simulating network performance, ASSET uses MonteCarlo algorithms, which can provide a good balancebetween accuracy and usability.

The Simulator can be used as Full simulation, withrandomised snapshots, or Simulation without snapshots.

With full simulation, the performance of the network canbe analysed over a series of randomised snapshots, inwhich specified densities of user terminals are positioned instatistically determined locations. The ability of eachterminal to make its connection to the network iscalculated through an iterative process. The performanceof the network is then analysed from the averaged results.

Si l ti ith S h t


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Simulation with Snapshots

Takes a large number of randomised snapshots of network performance for

different terminals over time

In these snapshots, the UEs are in statistically determined positions andgenerated independently for each snapshot

Si l ti ith S h t


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Simulation with Snapshots

Terminal count in a pixel is determined using a Poisson distribution with a

mean given by the number of terminals in the traffic array At the start of the snapshot, the mobile and cell powers are initialised to

zero to initialise the noise on the uplink and downlink

Other parameters, such as power control error, are set randomly on UE The first terminal in the list is tested for failure conditions. If it does not fail,

then its Tx power and the Tx power of the cells to which it is connected, aremodified. The next terminal in the list is then tested for failure conditions,and so on.

When the entire list has been tested, the simulator returns to the firstterminal and repeats the process until convergence is reached

When convergence is reached, the results of the snapshot are appended tothe results of the overall simulation. The simulation moves on to the nextsnapshot

When the simulation has completed all the specified snapshots, you canview your results using the arrays or view a summary of the data or reports

LTE Sim lato Wi a d


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LTE Simulator Wizard

Choose yourspecified output

Simulation without Snapshots


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Simulation without Snapshots

If you run a simulation without running snapshots (static analysis),you must ensure that the cell loading parameters for thecells/sectors have been specified in the Site Database

The parameters are set on the Cell Load Levels subtab, under LTEParams tab


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Auto Setup Option


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Auto Setup OptionMake the required selections for EXCLUSION from the output arrays.

Customised Output


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Customised Output

Simulation Best RSRP


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Simulation Best RSRP

Simulation RSRQ


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Simulation RSRQ

Simulation Report


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Simulation Report

Simulation Cell Centre / Cell Edge


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Simulation Cell Centre / Cell Edge


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Simulation DL RS SINR


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Simulation DL RS SINR

Simulation DL Transmission Mode


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Simulation DL Transmission Mode

Pixel Analyser


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The Pixel Analyser visualises detailed signal strength informationthat has been accumulated during a simulation.

Information about Simulated Terminals


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The aim of this feature is to provide the user with a set of arrays thatshow the locations of terminals generated by the simulation snapshots,

and to show whether the terminals succeeded or failed to make aconnection. The following arrays are provided for each terminal typeused in the simulation.

Terminal Info: Failure Rate

Terminal Info: Failure Reason

Terminal Info: Speed

The arrays are only available in simulations that run snapshots, andwhere the user has checked the Allow Terminal Info Arrays box on the

2nd page of the simulation wizard.

Information about Simulated Terminals


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o a o a ou u a ed e a s

Failure Reason array.

1 snapshot

Failure Reason array.500 snapshots


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1 5

2012 AIRCOM International Ltd

PCI Planning

Introduction to PCI planning


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Physical layer Cell Identity (PCI) identifies a cell within a network equivalent of UMTS scrambling code

There are 504 Physical Layer Cell Identities compared to 512 UMTS scrambling codes PCI are organised in 168 groups of 3 codes compared to 64 groups of 8 for UMTS scrambling codes

Physical layer Cell Identity = (3 Group(0 to 167)) + Code 0-2

Id = 5

Id = 4

Id = 3

Id =

11

Id =

10

Id = 9

Id = 8

Id = 7

Id = 6

Id = 2

Id = 1

Id = 0

Cluster Group

Physical Cell Identity (PCI)


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LTE PCI Schemas


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LTE PCI Schemas

PCI planner


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PCI planner

Fixed

This is a constant re-use distance from a cell, within which the planner will trynot to assign the same PCI

AutomaticThis is a variable re-use distance from a cell, within which the will try not to assignthe same PCI

In PCI planner you can specify a re-use distance from any cell which the

planner will try not to assign the same PCI. Two methods:

Physical layer Cell Identity


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= (3 x 2) + 2 =8

Group(0 to 167)

Code (0-2)

Minimising Groups.


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Minimising Groups.

Group =0

Code =0

PCI=0

Group =0

Code =1

PCI=1

Group =0

Code =2

PCI=2

Group =1

Code =0

PCI=3

Group =1

Code =1

PCI= 4

Group =1

Code =2

PCI= 5

Carrier

1

Carrier 1Carrier 1


PCI=0

PCI=1PCI=2

Carrier

1

Carrier 1Carrier 1

PCI=3

PCI=5PCI=4

ONLY TWO

GROUPS USED

PCI GROUP

CODE

CELLSPECIFIC

FREQ SHIFTFrequency shifts


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FREQ SHIFT

0 0 0 0

1 0 1 1

2 0 2 2

3 1 0 3

4 1 1 4

5 1 2 5

6 2 0 0CELL SPECIFIC FREQ SHIFTThis determines the DLRS pattern (timefrequency positions)

q y

PCI=0 PCI =0

PCI =0 PCI =6

PCI =1 PCI =7

PCI

=0

PCI

=0

Minimising Groups.


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Minimising Groups.


Group=0Code=0

PCI=0

Group=0Code=1

PCI=1

Group=0Code=2

PCI=2

Group=1Code=0

PCI=3

Group=1Code=1

PCI= 4

Group=1Code=2

PCI= 5

Carrier

1

Carrier 1Carrier

1

PCI=0

PCI=1

PCI=2

Carrier

1

Carrier 1Carrier

1

PCI=3

PCI=5

PCI=4

PCI GRO

UP

CO

DE

CELL

SPECIFICFREQ SHIFT

0 0 0 0

1 0 1 1

2 0 2 2

3 1 0 3

4 1 1 4

5 1 2 5

6 2 0 0CELL SPECIFIC FREQ SHIFT

This determines the DLRS pattern (timefrequency positions)

FREQ SHIFT

=0

FREQ SHIFT

=1

FREQ SHIFT

=2

FREQ SHIFT

=3

FREQ SHIFT

=4

FREQ SHIFT

=5


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Using a planning tool Very poor DLRS SINR


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Using a planning tool Very poor DLRS SINR


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Thank You

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mailto:[email protected]:[email protected]

Documents

Asset LTE - Slides- Robi