SOME/IP SERVICE DISCOVERY THE NEED FOR SERVICE DISCOVERY IN THE VEHICLE

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1 , BMW Group, Dr. Lars Völker SOME/IP SERVICE DISCOVERY THE NEED FOR SERVICE DISCOVERY IN THE VEHICLE

2 AGENDA Motivation Where do we come from? What does Ethernet bring to the table? Efficiency of Ethernet communication SOME/IP-SD Conclusion Vector Symposium, BMW Group, Dr. Lars Völker, Page 2

3 MOTIVATION WHERE DO WE COME FROM? CAN, FlexRay, MOST Shared medium, shared bandwidth 1:1 costs the same as 1:n communication = Somewhat limited bandwidth And small messages Scales by adding another CAN or FR bus Vector Symposium, BMW Group, Dr. Lars Völker, Page 3

4 MOTIVATION WHAT DOES ETHERNET BRING TO THE TABLE? With switched Ethernet the paradigm changes Switch medium, efficient unicast communication Unicast scales with additional links Larger messages (up to ~1500 bytes) supported Higher bandwidth (100Mbit/s today, 1000Mbit/s soon) Mixing speeds possible Vector Symposium, BMW Group, Dr. Lars Völker, Page 4

5 WHAT IF WE JUST TRANSPORT CAN OVER IP One could just use Ethernet as a super fast CAN AUTOSAR 4.0 added Ethernet support Header Mode to transport ID + data npduallows multiple CAN messages combined Send multicast Receiver is the limit! Lots of overhead CAN Message ID [ bit] Data [0..8 Bytes] Ethernet [~18 Bytes] IP [20 Bytes] UDP [8 Bytes] Message ID [32 bit] Length [32 bit] Data [0..8 Bytes] Vector Symposium, BMW Group, Dr. Lars Völker, Page 5

6 ETHERNET EFFICIENCY (DATA/OVERALL) SINGLE PDUS AND BPDU 1 0,9 0,8 efficiency (data/overall) 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 CAN messages over SOME/IP with npdu npdu Single CAN messages over SOME/IP PDU size Efficiency 50% or higher. Overall includes Ethernet header, 1x VLAN, IP, UDP, SOME/IP, inter frame gap, and PDU npdu single PDU npdu allows dynamic combination of PDUs using a SOME/IP header per PDU In this graph: npducombines as many PDUs of the stated size as possible Small messages are more inefficient than large ones. npdu increases efficiency for same size. Vector Symposium, BMW Group, Dr. Lars Völker, Page 6

7 ETHERNET EFFICIENCY HOW CAN WE HANDLE THE HIGH BANDWIDTH? Sending is easier than processing of received data at high bandwidth Limit incoming message rate and data at receiver side: 1. Increase data size and use npduto lower overhead 2. Send only needed PDUs to receiver Use large messages, npdu, and unicast communication But how to tailor unicast communication? Vector Symposium, BMW Group, Dr. Lars Völker, Page 7

8 TAILORED UNICAST COMMUNICATION AVOID FLOODING AND TAILOR MESSAGES AS NEEDED Solution 1: statically configure switches and PDU for each receivers Inflexible/complicated with different topology options and partial networking Very difficult to reach optimal efficiency Solution 2: improve processing support for received messages Possibly higher cost for the additional hardware As well as disadvantages of solution 1 Solution 3: dynamically handle availability and publish/subscribe Overhead by dynamic protocol But: handles complexity and makes it easy to reach efficiency Vector Symposium, BMW Group, Dr. Lars Völker, Page 8

9 SOME/IP-SD DESCRIPTION Scalable Service-Oriented MiddlewarE on IP (SOME/IP) SOME/IP allows service based communication Service Availability SOME/IP Service Discovery was built to control SOME/IP messaging Learn and find available services Learn receivers of messages (What? When? Where?) Allows efficient use of unicast and multicast (switching as well) Invalid marking and fast cycles not required anymore Can learn ARP tables (saves resources for ARP) Vector Symposium, BMW Group, Dr. Lars Völker, Page 9

10 SOME/IP-SD ADVANTAGES/DISADVANTAGES Advantages: Scaling (Multicast and Unicast supported) Flexibility (Communication partner can be learned, ) Fast sync after startup (independent of message cycle) Removes complexity of data path Service Availability Disadvantages: Extra signaling and state (hold subscriptions) Adds complexity to control path Vector Symposium, BMW Group, Dr. Lars Völker, Page 10

11 SOME/IP-SD INTEGRATION INTO AUTOMOTIVE ECUS RTE Linux, QNX, COM SOME/IP SD Socket Adaptor SOME/IP CAN FR UDP / TCP IP VS. UDP IP TCP AVB CAN Ethernet Ethernet Socket Adaptor, COM and RTE for SOME/IP. SD has own module. SOME/IP and SOME/IP-SD are implemented using library. Vector Symposium, BMW Group, Dr. Lars Völker, Page 11

12 CONCLUSION With growing bandwidth needs, Ethernet is an attractive solution Can replace different expensive technologies in the vehicle The reap all benefits, you want Unicast support without restrictions Support for CAN-like and MOST-like applications Flexibility (change of IP with unicast or even service migration) Fast sync after startup (even without very fast cyclic messages) SOME/IP-SD offers these benefits and is supported by AUTOSAR and GENIVI today Vector Symposium, BMW Group, Dr. Lars Völker, Page 12

13 THANK YOU FOR YOUR ATTENTION! ANY QUESTIONS? Dr. Lars Völker Vector Symposium, BMW Group, Dr. Lars Völker, Page 13

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