Transcript Internet - Metering.com

Internet Metering
Introduction
Internet
Internet Metering
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Contents:
 Introduction
 Hopes
 Facts
 Obstacles
 Solutions
 Summary
Harold Hayes,
Product Manager
I+C Meters
Landis+Gyr Africa
Introduction
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 The mobile communication and the Internet are technologies and
markets, which are determined through a high dynamic. The
assembling of the two subjects causes even higher expectations.
Not only new services and applications, but also complete new
business areas will be developed over the next few years.
 In the practise the fulfilment of the expectations has been seen as
not unproblematic. The transmission in the wireless environment is
determined through low bandwidth, higher delay times,
fundamental smaller reliability and high security needs. According
to the situation the technologies as TCP and Internet applications
have to be adapted.
Hopes
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 Standard Internet technology is available and
can be used for metering
 GPRS/Ethernet: Is always connected and the technology is cheap
 GPRS/Ethernet: Reduced communication costs
 Faster read out times
 New applications
Facts
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 GPRS and Ethernet offers low-cost access to the Internet via TCP
 Internet technologies are supported by the utility‘s IT-departments
 PSTN modem banks are supported by the meter reading
department
 Existing infrastructure (Central station, LAN, meters etc.) can be
upgraded to Internet Metering
 Online monitoring
 Ethernet replaces telephone lines in I+C buildings
 Enabler as world wide energy data provider
Communication Costs
Calculation example
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Typical application:
 Daily read-out time of 6 energy load profiles, TM=15min
Typical system:
GSM/GPRS
Network
Meter
Central station
Typical system parameters:
 GSM read out time: 72s (via dlms)
 GPRS data size:
10kByte
Communication Costs
Calculation example
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Tariffication model:
 Provider, Vodacom SA
http://www.vodacom.co.za
 GSM: R0.99/min
 GPRS: R0.02/10kByte
Typical data size per day:
 Data (HDLC) per day:
6.2kByte
 TCP overhead per day:
2.8kByte
 Heart beats (HDLC) for 5 hours:
1.0kByte
 Total:
10kByte
Communication Costs
Calculation example
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GSM
 Fix cost per year:
= 12*R 1490/month talk 1000
GPRS
 Fix cost per year:
12*R 1490/month talk 1000
 Variable cost per year:
R433 = 72s*R 0. 0165 /Sec
*365days/year
 Variable cost per year:
R 73 =10kByte*R 0.02 /10kByte
*365days/year
 Cost saving per meter per year:
R 360.62
 Communication cost = f (Tariffication model, Data size)
 R 360.62 * 5000 meters R 1.8 million per year
Obstacles
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 Addressing: The meter cannot be addressed from the Internet:
Shortage of IP addresses, Security.
 System integration: Existing data acquisition systems do not accept
access from the internet: Security, Scheduler based processes.
Solution:
Internet Meter Gateway
Solution set: Internet Meter Gateway,




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VPN, Data encryption
Unauthorized meter access
Unauthorized changes to parameters or software in the meter
Virus attacks to meter
Data fraud
Technology Lifetime: Internet -> 3 years, Metering -> 15 years
The Internet Meter Gateway Solution
= Replacing the modem bank
PSTN
Network
Internet
COM1
COM2
...
Virtual
Comports
Central Station
Gateway
1/2
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The Internet Meter Gateway Solution
2/2
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COM2
...
Gateway
Firewall
COM1
Firewall
= System Security
PSTN
Network
Internet
DMZ
Central Station
 Meter gate guard
Internet Meter Gateway in combination with the communication
unit controls and restricts the access to the meter
How does the system work?
GRPS
IP Address of
iMEGA and
Identifier
5. Meter
Connected
to central
2. Dynamic IP
Addressing
1. Login to
Network
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4. Dial
(ATDT...)
via ComPort
Fix IP address
connects central
to iMEGA
Intranet
Central
Dial
Meter x
Pre-Settings
Virtual
Com Port
connection
private
GSM-Network
(e.g. Swisscom)
Ethernet
Internet
Dynamic IP
Addressing
Fix IP
Address
3. Subscribe
to iMEGA
Fix IP Address
connects iMEGA to
LAN/Internet
Meter x
Internet Meter
Gateway
System migration
at central side
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Migration cases:
 Communication technology:
GSM, PSTN  GPRS, Ethernet
 Call process: central calls meter  meter calls central
 Processing:
sequential processing  parallel processing
Implementation task:
 Installation of virtual modems
(Existing physical modems may remain)
 Installation of an Internet Meter Gateway in DMZ
Central station requirement
 Support of high communication delay times
At central station no conception change needed.
Data acquisition times
Sequential versus parallel
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 Sequential data acquisition by using PSTN/GSM technology
M1
M2
M3
M4
M5
Mn+1
 Parallel data acquisition by using GPRS/Ethernet technology
M1
M2
M3
M4
M5
Mn
Time saving compared to
PSTN/GSM technology
Security at meter side
Data encryption
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Market Participant
Internet
Metering Company
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Signature Algorithm:
Elliptic Curve (ECDSA)
ISO/IEC 5946-1/2/3, ISO/IEC 7816
Key Length:
192 Bit corresponding
to RSA 1280 Bits
Summary
Opportunities with
Internet Metering
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 A wireless connection (GPRS) or a connection via LAN (Ethernet
Local Area Network) to the Internet is conveniently possible with
TCP/IP.
 Existing infrastructures such as central stations, LAN, meters, etc.
can continue in use. The installation and maintenance costs are
reduced, however, since for example no further central station
modems are required.
 Parallel data acquisition results in shorter acquisition times.
 With TCP/IP the meters can be permanently connected to the
central station to permit continuous monitoring of the meters.
Nevertheless the communication costs with GPRS are significantly
lower than with normal GSM mobile communication.
 Worldwide Internet access and lower communication costs (there
are also no roaming costs for connections abroad) make new
applications possible, e.g. worldwide energy data providers.