Vorlesung Kommunikationsnetze Research Topics: Protocol Family for Control Data Communication in Heterogeneous Network Environments
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1 Prof. Dr. H. P. Großmann mit B. Wiegel sowie A. Schmeiser und M. Rabel Sommersemester 2009 Institut für Organisation und Management von Informationssystemen Vorlesung Kommunikationsnetze Research Topics: Protocol Family for Control Data Communication in Heterogeneous Network Environments
2 Seite 3 Fieldbus Systems Specialized networks Governing Closed-loop control Automation Evolved historically Automotive engineering Industrial communication Building services engineering Embedded system environment Limited resources Variety of interfaces Network technology Application specific higher layer protocols
3 Seite 4 Heterogeneous Network Environment in Cars No consolidation Divergent requirements to QoS Conservative approach Cost pressure Complex Systems need elaborate, application specific gateways LIN Local Interconnect Network CAN Controller Area Network TTP Time Triggered Protocol MOST Media Oriented Systems Transport
4 Seite 5 Goals Data communication with standardised gateways Using redundant paths Routing under consideration of QoS Common interface for future-proof applications Normal operation mode Control data communication Data packet with small amount of payload Overhead as little as possible Temporary operation mode Software updates of automation devices Transfer of larger amount of data Transfer of data from/to Internet Remote diagnosis and maintenance
5 Seite 6 Concept: Hierarchical Protocol Family Concept: Hierarchical Protocol Family
6 Seite 7 Excursus: IPv4 Datagram Excursus: IP Datagram
7 Seite 8 Hierarchical Protocol Family: Layer 3 Micro Internet Protocol (MIP) as the convergence layer Transparent communication using different network technologies Consistent addressing scheme: 16 bit node address 8 bit network, 8 bit host Interfaces to fieldbuses Adaptation of addressing schemes Fragmentation Exemplary defined for LIN, CAN, Bluetooth, IEEE 1394 Unacknowledged datagrams Optimised header for control data ( byte 7 byte (IP: min. 20 Indication of desired QoS by applications
8 Seite 9 MIP Datagram MIP Protocol 0x1 0x2 0x3 0x4 ( MICMP ) Micro Internet Control Message Protocol ( MUDP ) Micro User Datagram Protocol ( MTCP ) Micro Transmission Control Protocol ( MOSPF ) Micro Open Shortest Path First
9 Seite 10 Interface to LIN LIN Identifier ( frame LIN Data (unconditional ( frame LIN Data (event-triggered
10 Seite 11 Interface to CAN CAN Identifier CAN Data Length Code CAN Data
11 Seite 12 Interface to Bluetooth Based on Bluetooth Network Encapsulation Protocol (BNEP) over Logical Link Control and Adaption Protocol (L2CAP) MARP-BT Datagram Type = 0x0 Hex MIP Datagram Type = 0x1 Hex
12 Seite 13 Interface to IEEE 1394 Unicast: Write Request for Data Block (WRDB) ( GASP ) Broadcast: Global Asynchronous Stream Packet MARP-1394 Datagram Type = 0x0 Hex MIP Datagram Type = 0x1 Hex
13 Seite 14 Routers in place of Gateways Consider heterogeneous networks as subnets Routing is independent of the used fieldbus Using redundancy if a network segment fails Basis for QoS dependent routing
14 Seite 15 ( I ) Hierarchical Protocol Family: Layer 4 ( MICMP ) Micro Internet Control Message Protocol Signalling of errors due to processing of MIP datagrams Network diagnosis ( byte Header: 1 byte (ICMP: 8 MICMP Type 0x0 Echo Test x3 TTL Exceeded 0x4 Destination Unreachable 0x5 Parameter Problem
15 Seite 16 ( II ) Hierarchical Protocol Family: Layer 4 ( MUDP ) Micro User Datagram Protocol Connectionless unreliable transport service for applications Header: 1 byte Comparison: User Datagram Protocol (UDP) Header: 8 byte
16 Seite 17 ( III ) Hierarchical Protocol Family: Layer 4 ( MTCP ) Micro Transmission Control Protocol Transport service for applications Connection-oriented, reliable Transactions ( byte Header: 4 byte (TCP: min. 20 MTCP Control Bit Signal unuse d unuse d FACK ACK FIN CON WND RST
17 Seite 18 MTCP Connection Establishment Case 1: Node 2 answers connection request from node 1 with ACK flag solely. Case 2: Node 2 sends ACK flag together with the first data package.
18 Seite 19 MTCP Connection Termination Case 1: Node 2 has no further data. The received segment from node 1 is acknowledged by ACK flag, the connection is terminated by FACK flag. ACK and FACK flag can be combined. Case 2: Node 2 has further data. The FACK flag can be sent when all data segments of node 2 are acknowledged from node 1.
19 Seite 20 MTCP Transaction Special case of connection termination, the CON flag is set in the first segment Case 1: Status message from node 1 to node 2. Case 2: Transaction, consisting of request and reply.
20 Seite 21 ( IV ) Hierarchical Protocol Family: Layer 4 ( MOSPF ) Micro Open Shortest Path First Link-state routing protocol for QoS dependent routing Exchange of topology informationen between routers ( byte Header: 3 byte (OSPF: 24 MOSPF Type 0x1 Hello 0x2 0x3 0x4 0x5 Database Description Link State Request Link State Update Link State Acknowledgement
21 Seite 22 Application Example Application Example
22 Seite 23 MIP vs. IP MIP vs. IP
23 Seite 24 Comparison of Transfer Time and Latency Using MTCP packets with 8 bytes payload Field bus and operation mode LIN unconditional (20 kbit/s) CAN (1Mbit/s) Bluetooth DH1 IEEE 1394 GASP Worst case Transfer time 24,8 ms 377 µs 625 µs 12,95 µs Latency 396,8 ms 393 µs 8,125 ms 3,5 ms 32 ms
24 Seite 25 Summary Idea of Internet protocol family reused Lean protocol for embedded systems Routers in place of gateways Defined interfaces for applications
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