SON technology in small cell deployment

Copyright 2016 ITRI 1

Study for small cell with smart antennaindoor deployment


Outline

ITRI SON with smart antenna

ITRI SON solution for smart antenna application

ITRI small cell and smart antenna spec.

Use Case

Smart antenna at office cubicles

Smart antenna at corridor

Interference management by smart antenna beam pattern automatic adjustment (ITRI-SON)


Outline




Use Case






ITRI’s SON Server

ITRI’s SON Server to compute the transmission power and beam

pattern of each small cell by ITRI Smart Antenna CCO algorithm,

and to provide the optimal coverage and avoid the interference.

Each small cell informs the location information

to SON Server if turned on.

SON Server remote settings the transmission

power and beam pattern for each small cell.

1

2

3



ITRI Small cell

Transmission power

19 ~ -40 dbm

TD-LTE band 40(2300MHz)

S1/X2 interface

ITRI Smart antenna

5 sector antennas for adaptive

beamforming

Support 961 beam patterns

Frequency Band:1710-2690MHz

Real Measurement of only A1 ON beam

pattern (RSRP)

A or B or A+B3D figures of other beam patterns of Smart antenna

A1A1+A2+A3A1+A2+A3+A4

Adaptive beamforming

Structure of Smart

Antenna

Expected only A1

ON Beam Pattern


Outline



ITRI smart antenna spec.

Use Case





Smart antenna at office cubicles (1/3)

Test Scenario– Test location: Meeting room and aisle

– Test conditions：

» Small cell transmission power:

• 10dbm, 0dbm, -10dbm

» Beam Pattern:

Smart Antenna withＡ1

Omni

– Design of NLOS test environment:

» Orange line: Through a wall

» Blue line: Through three partitions

The direction of Antenna A1 turned on toward the arrow.

Partitions

Structure of smart antenna The radiation pattern in only Antenna A1 turned

on.

R506

R506 R505

R501to door

from R506

to wall from R506


Smart antenna at office cubicles (2/3)• Result of indoor NLOS measurement

– Orange line: Through a wall

Wall


Partitions


Smart antenna at office cubicles (3/3)• Result of indoor NLOS measurement

– Blue line: Through three partitions

Partition

Partitions



Smart antenna at corridor (1/3)

Test Scenario– Test location: Indoor aisle 1M~80M

– Test conditions:

» Small cell transmission power:

• 10dbm

» Beam Pattern：

Omni

Smart Antenna with A1~A5

Signal measurement: 51-5F aisle

Structure of smart antenna The radiation pattern in only Antenna A1 turned on.


Smart antenna at corridor (2/3)• The performance measurement results of Smart Antenna indoor field LOS test

– Compare the SINR and RSRP performance of omni-directional antenna, smart antenna (with one antenna A1 ON) and smart antenna (with five antennae A1~A5 ON) in the same transmission power

» Measurement result:

• LOS： omni-directional antenna > smart antenna(A1~A5)

• NLOS： omni-directional antenna > smart antenna(A1~A5)

Reason: The gain of smart antenna (with one antenna ON) is about 5db, and it decreases to 3db with five antennae ON, however,

the gain of omni-directional antenna is about 5db.


Smart antenna at corridor (3/3)• The performance measurement of Smart Antenna indoor field LOS test

» Test location: indoor long passageway starts from 1M to 80M

» Test condition:• Small Cell Transmission power: 10dbm

• Beam Pattern: only A1 ON

» Test result

• LOS：smart antenna > omni-directional antenna

10

15

20

25

30

35

1m 3m 5m 10m15m20m25m30m35m40m45m50m55m60m65m70m75m80m

SINR 10db(1m~80m)

LOS of Omni-Directional LOS of Smart-Antenna

NLOS of Omni-Directional NLOS of Smart-Antenna

-140

-120

-100

-80

-60

1m 3m 5m 10m 15m 20m 25m 30m 35m 40m 45m 50m 55m 60m 65m 70m 75m 80m

RSRP 10dbm(1m~80m)

LOS of Omni-Directional LOS of Smart-Antenna

NLOS of Omni-Directional NLOS of Smart-Antenna

Average difference of LOS is about 4dbm Average difference of LOS is about 1db



Interference management by ITRI-SON + Smart Antenna

SON Server is combined with the interference

cancellation mechanism of Smart Antenna

− SON Server can mitigate signal interference and improve signal

quality through signal transmission direction and strength adjustment

The mechanism of CCO automatic algorithm for Smart Antenna

− Combine with the CCO algorithm, automatically adjust the best

direction of beam pattern to mitigate signal interference and

improve network coverage and capacity

1m between two uDcells

eNB1 RSRQ eNB1 RSRQ eNB2 RSRQ eNB1 RSRQ eNB2 RSRQ eNB1 RSRQ

No interference

Interferenceoccurs

HO between eNB1 and eNB2

HO between eNB1 and eNB2

interference cancellation

Screenshotof engineering edition smartphone

SON technology in small cell deployment

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