Investigation of Wireless Telecommunication for AMI - CIRED ...

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Frankfurt (Germany), 6
-
9 June 2011

Katsuyuki KARIYA

,

Tatsuya NAKAMURA

, Shinji TAKEUCHI

, Atsushi OTOGAWA



Yukio IWASHIMA
††
, Yasuhisa MATSUSHITA
††


Hitoshi KUBOTA
†††
, Toshihiro INOUE
†††





: Chubu Electric Power Co., Inc.,

††

: ChubuSeiki Co., Ltd.,

†††

: Mitshubishi Electric Corporation

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Investigation

of

Wireless Telecommunication for AMI

Frankfurt (Germany), 6
-
9 June 2011



Introduction


Measured wireless media


Conditions of measurements


Results of the Investigation


Summary


Outline

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011


Why Advanced Metering Infrastructure (AMI)?



Improves efficiency of meter reading


Energy conservation



Future; Efficient operation of power distribution
under condition in which distributed power
source are widely spread,
etc


Introduction

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

SM

SMN

WAN

Server Computers

GW


What’s Advanced Metering Infrastructure (AMI)?


A Model of AMI System

Introduction


Millions of smart meters (SMs)
perform two
-
way
communication with Server
computer via smart meter
networks(SMNs), Gateways
(GWs), and Wide area network
(WAN).

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011


Why wireless telecommunication?


Number of meters per service transformer is
small (About 10~20 meters)


Meters are installed outside


Introduction

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

The installation cost of the PLC coupler is
expensive

in Japan.

Therefore, the wireless is more cost effective

.

Frankfurt (Germany), 6
-
9 June 2011

Introduction


Radio propagation characteristics of three kinds
of license free wireless communication media
were investigated.


What's suitable wireless media for AMI system?


Easy to use


Low cost

License Free Wireless media in Japan


2.4GHz wireless LAN


950MHz Low Power Radio


429MHz Low Power Radio

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Measured wireless media

2.4GHz

Wireless LAN

950MHz

Low Power Radio

429MHz

Low Power Radio

Output Power

10mW/MHz

10mW

10mW

Channel Band
Width

22MHz

200kHz

8.5kHz

Modulation

DSSS
*1

GFSK
*2

GFSK
*2

Data Transfer
Rate

1Mbps

100kbps

4.8kbps

Reference

IEEE 802.11b

ARIB
*3

STD
-
T33

ARIB STD
-
T96

ARIB STD T
-
67

*
1 : Direct Sequence Spread Spectrum

*2 : Gaussian Frequency Shift Keying

*3 : Association of Radio Industry Business

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011


Measurements excecuted under condition which
simmulated communication


A)
Between a GW placed on a utility pole and SMs
of detached houses.

B)
Between a GW placed on a utility pole and SMs
in pipe shafts of an apartment building.

C)
Among SMs in pipe shafts of an apartment.



Conditions of Measurements

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Conditions of Measurements



A transmitter was placed on a handrail of outside stairs
of an apartment building.


Receivers were placed by utility poles around the
apartment building.


A)
Communication between GW and SM of detached house

6m

1.8m

Receiver

Transmitter

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Conditions of Measurements



A transmitter was placed in a pipe shaft of an apartment
building.


Receivers were placed by utility poles around the
apartment building.

B)
Communication between GW and SM in Apartment Building

1.8m

Transmitter

Receiver

Pipe Shaft

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Conditions of Measurements



Both transmitter and receivers were placed in pipe
shafts of an apartment building.


C)
Communication
among

SM
s

in
an
Apartment Building

Transmitter & Receiver

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011



Results of measurements

0
10
20
30
40
50
60
70
80
90
100
-120
-115
-110
-105
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
Received Signal Power [dBm]
Packet Error Rate [%]
2.4GHz wireless LAN Received Signal Power vs. Packet Error Rate


Received Signal Power vs. Packet Error rate

Serviceable area

Where

received signal
power is strong enough
and packet error hardly
occurs.


Fringe area

Where packet error
increases

Unserviceable area

Received signal
power is so weak that
packet error
frequently occurs.

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Results of measurements

Serviceable Area

Fringe Area

Unserviceable Area

Wireless LAN


Received Power

>=
-
85dBm

-
85dBm

> Received Power

>=
-
98dBm

-
98dBm

> Received Power

950MHz

Low Power Radio


Received Power

>=
-
95dBm

-
95dBm

> Received Power

>=
-
100dBm

-
100dBm

> Received Power


429MHz


Low Power Radio


Received Power

>=
-
90dBm

-
90dBm

> Received Power

>=
-
110dBm

-
110dBm

> Received Power



Classification of measurements Results

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

100m

200m

0
°

180
°

90
°

270
°

100m

200m

0
°

180
°

90
°

270
°

Results of measurements





(
a)2.4GHz Wireless LAN

A)
Communication between GW and SM of detached house(1)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

100m

200m

0
°

180
°

90
°

270
°

Clear

Space

Reinforced

Concrete

Building

Unserviceable

Area

Fringe

Area

Serviceable

Area

(c)429MHz Low Power Radio

(b)950MHz Low Power Radio

Frankfurt (Germany), 6
-
9 June 2011



950MHz low power radio had longest range in
the three wireless media.


All of the three wireless media had difficulty to
establish communication across the apartment
building nearby.

Results of measurements

A)
Communication between GW and SM of detached house(2)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

30m

0
°

90
°

180
°

270
°

30m

0
°

180
°

90
°

270
°

30m

0
°

180
°

90
°

270
°

Results of measurements





(c)429MHz Low Power Radio

(b)950MHz Low Power Radio

(a)2.4GHz Wireless LAN

B)
Communication between GW and SM in Apartment Building
(1)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Clear

Space

Reinforced

Concrete

Building

Unserviceable

Area

Fringe

Area

Serviceable

Area

Frankfurt (Germany), 6
-
9 June 2011



429MHz low power radio could establish
communication between inside of a pipe shaft
and utility poles on both steel door’s side and its
opposite side of the pipe shaft.


2.4GHz wireless LAN and 950MHz low power
radio had difficulty in communication between
SM and GW on a steel door’s side of the pipe
shaft.



Results of measurements

B)
Communication between GW and SM in Apartment Building
(2)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Results of measurements

8
m
8
m
16
m
16
m
2
m
1
m
6
m
2
m
Pipe Shafts
Staircase
Dimensions of the Apartment Building.

(5
-
storied building)



C)
Communication
among

SM
s

in Apartment Building
(1)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Chose an apartment building which has long distance between each
pipe shafts.

Frankfurt (Germany), 6
-
9 June 2011

Results of measurements

(c)429MHz Low Power radio


(a)2.4GHz Wireless LAN

(b)950MHz Low Power radio

C)
Communication
among

SM
s

in Apartment Building
(2)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Good communication even
with adjacent pipe shaft

Poor communication with
adjacent pipe shafts

Staircase
Staircase
Staircase
Room
105
Room
505
Tx
Room
504
Room
103
Room
404
Room
405
Room
304
Room
305
Room
204
Room
205
Room
104
Room
501
Room
401
Room
301
Room
201
Room
302
Room
303
Room
202
Room
203
Room
502
Room
503
Room
402
Room
403
Room
505
Room
405
Room
305
Room
205
Room
105
Room
101
Room
101
Staircase
Staircase
Staircase
Room
303
Room
103
Room
304
Room
305
Room
204
Room
205
Room
104
Room
501
Room
502
Room
503
Room
505
Room
301
Room
201
Room
101
Room
504
Room
404
Room
402
Room
403
Tx
Room
105
Room
505
Room
405
Room
305
Room
205
Room
405
Room
105
Room
202
Room
203
Room
101
Room
302
Room
401
Staircase
Staircase
Staircase
Room
105
Room
505
Room
405
Room
305
Room
205
Room
101
Room
504
Room
505
Room
404
Room
405
Room
105
Room
201
Room
101
Room
502
Room
503
Room
402
Room
403
Room
302
Room
303
Room
202
Room
203
Room
501
Room
401
Room
301
Room
103
Room
204
Room
205
Room
104
Room
304
Room
305
Tx
Unserviceable

Area

Fringe

Area

Serviceable

Area

Tx

Transmitter

Frankfurt (Germany), 6
-
9 June 2011



429MHz low power radio could establish
communication not only between SMs in same
pipe shaft or between SMs in adjacent pipe
shafts on same floor but also between SMs in
adjacent pipe shafts on different floors.


Results of measurements

C)
Communication
among

SM
s

in Apartment Building
(3)

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011



In view of serviceable area 950MHz low power
radio is the most suitable communication media
for smart meter network.


429MHz low power radio has advantages over
two other wireless media for communication in
apartment buildings.


Summary

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011



The results of this investigation shows
differences of radio propagation characteristics
among wireless media.


Steady SMN must be built with selecting suitable
wireless media for conditions of meter
installation.

Summary

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737

Frankfurt (Germany), 6
-
9 June 2011

Thank you for your attention.


We Japanese are grateful for the kindness of people of
all over the world.

Katsuyuki KARIYA


Japan



Distribution network business activities and impact of regulation



0737