Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Internet Metering Introduction Internet Internet Metering 29.04.2005 / 1 Contents: Introduction Hopes Facts Obstacles Solutions Summary Harold Hayes, Product Manager I+C Meters Landis+Gyr Africa Introduction Internet Metering 29.04.2005 / 2 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 Internet Metering 29.04.2005 / 3 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 Internet Metering 29.04.2005 / 4 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 Internet Metering 29.04.2005 / 5 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 Internet Metering 29.04.2005 / 6 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 Internet Metering 29.04.2005 / 7 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 Internet Metering 29.04.2005 / 8 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, 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 Internet Metering 29.04.2005 / 9 The Internet Meter Gateway Solution 2/2 Internet Metering 29.04.2005 / 10 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 Internet Metering 29.04.2005 / 11 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 Internet Metering 29.04.2005 / 12 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 Internet Metering 29.04.2005 / 13 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 Internet Metering 29.04.2005 / 14 001011010001 001001010010 100101010010 010100101010 101010101010 101010010101 010101010100 100101010101 100101001010 001011010001 001001010010 100101010010 010100101010 101010101010 101010010101 010101010100 100101010101 100101001010 Market Participant Internet Metering Company 001011010001 001001010010 100101010010 010100101010 101010101010 101010010101 010101010100 100101010101 100101001010 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 Internet Metering 29.04.2005 / 15 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.