WO2006044128A2 - Evaluating the performance of an automotive switch network - Google Patents
Evaluating the performance of an automotive switch network Download PDFInfo
- Publication number
- WO2006044128A2 WO2006044128A2 PCT/US2005/034667 US2005034667W WO2006044128A2 WO 2006044128 A2 WO2006044128 A2 WO 2006044128A2 US 2005034667 W US2005034667 W US 2005034667W WO 2006044128 A2 WO2006044128 A2 WO 2006044128A2
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- test
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- message
- control message
- diagnostic device
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/005—Moving wireless networks
Definitions
- This invention in general relates to in-vehicle communication networks and particularly to a system and method for evaluating the performance of an automotive switch fabric network using a diagnostic interface.
- the switch fabric is a web of interconnected switching devices or nodes. Control devices, sensors, actuators and the like are coupled to the switch fabric, and the switch fabric facilitates communication between these coupled devices.
- the coupled devices may be indicator lights, vehicle control systems, vehicle safety systems, and comfort and convenience systems.
- a command to actuate a device or devices may be generated by a control element coupled to the switch fabric and is communicated to the device or devices via the switch fabric nodes.
- FIG. 1 is a block diagram illustrating an embodiment of a vehicle switch fabric network
- FIG. 2 is a diagram illustrating a portion of the switch fabric network connected to a plurality of interfaces and devices
- FIG. 3 is a diagram illustrating one embodiment of a node in the switch fabric network
- FIGS. 4a, 4b are diagrams illustrating one embodiment of software components that may reside in a gateway node and other remote nodes in the switch fabric network;
- FIG. 5 is a diagram illustrating a diagnostic device and diagnostic interface connected to a switch fabric network for evaluating the performance of the network
- FIG. 6 is a flow diagram illustrating one embodiment of the message processing logic for a node under evaluation.
- a diagnostic device and interface is connected to an automotive switch fabric network, comprising of a plurality of communication nodes, through a gateway node.
- the diagnostic device and interface will configure the switch fabric network to operate in a test mode.
- the diagnostic interface will issue a first command to one node to start traffic across a test node at a predetermined traffic rate and a second command to another node to generate a test message that passes through the test node.
- the test node contains message processing logic that will process the messages as they pass through the test node. The rate and frequency of the message may be adjusted by a user.
- a set of timestamps is generated in the message processing logic of the test node to monitor the progression of the messages through the processing logic.
- the test node includes a diagnostic interface agent that collects the timestamp data and reports the data back to the diagnostic interface and device.
- FIG. 1 illustrates the function and operation of one embodiment of a switch fabric network in a vehicle 20.
- the vehicle 20 includes a network 22 that interconnects various vehicle devices 24a-d through respective network interfaces 26a-d.
- the vehicle devices 24a-d may be sensors, actuators, and processors used in connection with various vehicle functional systems and sub-systems, such as, but not limited to, diagnostic, control-by-wire applications for throttle, braking and steering control, adaptive suspension, power accessory control, communications, entertainment, and the like.
- the devices 24a-d may be external or internal to the vehicle.
- the one embodiment, that includes a system for measuring the performance of the network 22, one of the devices is an external diagnostic device 24a.
- the network interfaces 26a-d are any suitable interface for coupling the particular vehicle device 24a-d to the network 22, and may be wire, optical, wireless or combinations thereof.
- the vehicle device 24a-d is particularly adapted to provide one or more functions associated with the vehicle 20.
- the vehicle devices 24a-d may be data producing, such as a sensor, data consuming, such as an actuator, or processing, which both produces and consumes data.
- the external device 24a is a processing diagnostic device that permits a user to exchange data with the network of the vehicle, as will be explained further below. Data produced by or provided to a vehicle device, and carried by the network 22, is independent of the function of the vehicle device itself.
- the connection between the devices 24a-d and the respective interfaces 26a-d may be a wired or wireless connection.
- FIG. 1 illustrates both types of connections between the diagnostic device 24a and its interface 26a, a wired connection 25 and a wireless connection 27.
- the device 24a and the interface 26a include wireless communication transceivers permitting the units to communicate with each other via an optical or radio frequency transmission.
- the interface 26a may be a single device or incorporated as a single assembly- as part of a network gateway node 30a. Irregardless of the type of connection or type of assembly, the interface 26a to the diagnostic device 24a should arbitrate the linking of the device 24a to the network 22 through an authentication, security and encryption process.
- the network 22 may include a switch fabric 28 defining a plurality of communication paths between the vehicle devices 24a-d.
- the communication paths permit multiple simultaneous peer-to-peer, one-to-many, many-to-many, etc. communications between the vehicle devices 24a-d.
- data exchanged, for example, between devices 24b and 24d may utilize any available path or paths between the vehicle devices 24b, 24d.
- a single path through the switch fabric 28 may carry all of a single data communication between one vehicle device 24b and another vehicle device 24d, or several communication paths may carry portions of the data communication.
- Subsequent communications may use the same path or other paths as dictated by the state of the network 22 or its performance. This provides reliability and speed advantages over bus architectures that provide single communication paths between devices, and hence are subject to failure with failure of the single path.
- communications between other of the devices 24a, 24c may occur simultaneously using the communication paths within the switch fabric 28.
- the network 22 may comply with transmission control protocol/Internet (TCP/IP), asynchronous transfer mode (ATM), Infiniband, RapidIO, or other packet data protocols. As such, the network 22 utilizes data packets, having fixed or variable length, defined by the applicable protocol. For example, if the network 22 uses asynchronous transfer mode (ATM) communication protocol, ATM standard data cells are used.
- TCP/IP transmission control protocol/Internet
- ATM asynchronous transfer mode
- ATM asynchronous transfer mode
- the internal vehicle devices 24b-d need not be discrete devices. Instead, the devices may be systems or subsystems of the vehicle and may include one or more legacy communication media, i.e., legacy bus architectures such as the Controller Area Network (CAN) protocol, the SAE Jl 850 Communication Standard, the Local Interconnect Network (LIN) protocol, the FLEXRAY Communications System Standard, the Media Oriented Systems Transport or MOST Protocol, or similar bus structures.
- legacy bus architectures such as the Controller Area Network (CAN) protocol, the SAE Jl 850 Communication Standard, the Local Interconnect Network (LIN) protocol, the FLEXRAY Communications System Standard, the Media Oriented Systems Transport or MOST Protocol, or similar bus structures.
- the respective interface 26b-d may be configured as a proxy or gateway to permit communication between the network 22 and the legacy device.
- an active network 22 in accordance with one embodiment of the present invention includes a switch fabric 28 of nodes 3Oa-I that communicatively couples a plurality of devices 24a-d via respective interfaces 26a-d.
- Connection media 32 interconnects the nodes 3Oa-I.
- the connection media 32 may be bounded media, such as wire or optical fiber, unbounded media, such as free optical or radio frequency, or combinations thereof.
- node is used broadly in connection with the definition of the switch fabric 28 to include any number of intelligent structures for communicating data packets within the network 22 without an arbiter or other network controller and may include: switches, intelligent switches, routers, bridges, gateways and the like. For instance, in the embodiment shown in FIG.
- the nodes include a gateway node 30a that connects the diagnostic interface 26a (and the diagnostic device 24a) to the switch fabric 28.
- Data is carried through the network 22 in data packet form guided by the nodes 3Oa-L
- the cooperation of the nodes 30a-l and the connection media 32 define a plurality of communication paths between the devices 24a-d that are communicatively coupled to the network 22.
- a route 34 defines a communication path from the gateway node 30a to a target node 3Og.
- a new route illustrated as route 36
- the route 36 may be dynamically generated or previously defined as a possible communication path, to ensure the communication between the gateway node 30a and the target node 30g.
- FIG. 3 shows one embodiment of the nodes 30a-l having a plurality of input/output ports 50a-d although separate input and output ports could also be used.
- Various configurations of the nodes 30a-l having more or fewer ports may be used in the network 22 depending on the application.
- Each node 3Oa-I may include a processor
- the processor 52 includes a suitable control program for effecting the operation of the nodes for coupling inputs to outputs in order to transmit data packets within the switch fabric 28.
- the transceiver 54 may be a wireless transceiver or a wired transceiver depending on the type of communication media 32 that interconnects the nodes 30a-301 in the switch fabric 28.
- the memory 56 provides storage for the control programs for operating the nodes as well as, for purposes of the present invention, software components and modules to communicate with the diagnostic device 24a to aid in measuring the performance of the switch fabric 28.
- the clock 58 may be used, for purposes of the present invention, to record timestamps during the passage of a message through the node's message processing logic.
- the clock 58 may be subject to a common time base with other nodes in the switch fabric 28 or may be subject to synchronization steps as described in the patent applications "System and Method for Time Synchronizing Nodes in an Automotive Network Using Input Capture," Serial
- the system is adapted to allow the diagnostic device 24a and interface 26a to operate the switch fabric 28 in a test mode by sending commands to and receiving data from various nodes.
- FIG. 4 illustrates the various software components that may reside in the gateway node 30a and the other remote nodes 3Ob-I in the switch fabric 28.
- the gateway node 30a and the remote nodes 3Ob-I include software components for an application layer 60, a network layer 62, and a link (or bus) layer 64.
- the gateway node 30a may further include a diagnostic interface gateway 66 application that allows the gateway node 30a to communicate with the diagnostic device 24a and diagnostic interface 26a.
- the gateway node 30a and the remote nodes 30b-l further include a diagnostic interface agent 68 that spans across the application layer 60, the network layer 62, and the link (or bus) layer 64.
- the diagnostic interface agent 68 may be configured to collect timestamp data and report the data back to the diagnostic interface and device.
- the diagnostic interface agent 68 includes a test source application 72 and a test destination application 74 are part of the application layer 60. When the test source application 72 is enabled in a node, the node will then be capable of sending a test message to another node having the test destination application 74 enabled.
- the diagnostic interface agent 68 may also include a traffic generator module 78 in the link layer 64. When the traffic generator component 78 is enabled in a node, the node will then start to send traffic messages that may be based on a rate and frequency by the system manager 40.
- the diagnostic interface agent 68 may further include a diagnostic module 76 that enables a node to collect data based on test messages and traffic messages being transmitted through the node. The transmission of test and traffic messages and the gathering of data is explained in further detail below.
- FIG. 5 shows a user 42 that can interact with a diagnostic device 24a.
- the diagnostic device 24a contains a software manager 40 that includes instructions for initiating and operating the switch fabric 28 in a test mode.
- the diagnostic device 24a is connected via a wired link 25 or a wireless link 27 to diagnostic interface 26a.
- the diagnostic interface 26a couples the diagnostic device 24a to the vehicle network 22 (and the switch fabric 28) through one of the nodes 30a- 1, for example the gateway node 30a.
- the diagnostic interface 26 is separate from the nodes 3Oa-I in the switch fabric network 28.
- FIG. 5 illustrates one embodiment of a method for evaluating the performance of communication paths through the switch fabric 28. Although specific measurements are implementation specific, and one of ordinary skill in the art having the benefit of this disclosure will realize that other test modes may be used within the framework of the present invention, FIG. 5 illustrates an exemplary test mode for evaluating the performance of the nodes of the switch fabric 28.
- the switch fabric 28 include a plurality of communication nodes 30a-301 that are joined together by communication links 32 for the transmission of data there between.
- the plurality of nodes 30a-301 include a gateway node 30a, a test node 30f, a first neighboring test node 3Oe and a second neighboring test node 30b.
- the system manager 40 in the diagnostic device 24a will begin by configuring the switch fabric 28 to a test mode. This may include disabling applications relating to the regular operation of the switch fabric 28.
- the system manager 40 in the diagnostic device 24a may then send a first control message to the gateway node 30a through the diagnostic interface 26a.
- the gateway node 30a will receive the first control message and may route the first control message to the first neighboring test node 30e (arrow A).
- the first control message may contain a command for the first neighboring test node 3Oe to generate traffic messages through the test node 30f (arrows B).
- the rate and frequency of the traffic messages may be adjusted by a user at the diagnostic device 24a and inserted into the first control message.
- the system manger 40 in the diagnostic device 24 may then send a second control message to the gateway node 30a through the diagnostic interface 26a.
- the gateway node 30a will receive the second control message and may route the second control message to the second neighboring test node 30b (arrow C).
- the second control message may contain a command for the second neighboring test node 30b to generate a test message through the test node 30f (arrows D).
- the test message may be send through the test node 30f to another neighboring node 30j that causes the node 30j to respond with a reply test message back through the test node 30f (arrows E).
- FIG. 6 illustrates one example of a flow for establishing timestamps in the message processing logic and for measuring the performance of the switch fabric 28.
- the test node 3Of will receive a message, such as a traffic message or a test message, in the node's receive buffer.
- the test node 3Of may be configured to store a timestamp (Tl) when a new message is ready to be processed out of the node's receive buffer.
- Tl timestamp
- the processing logic of the test node 30f may then determine whether the message requires any local action. For instance, if the message is simply a traffic message that was received from the first neighboring node 30e (and intended for another neighboring node 30g), the test node 30f may then continue to process block 106 where the size of the transmit buffer is checked.
- another timestamp (T2) is stored that is associated with verifying the availability of the transmit buffer.
- T2 another timestamp
- the process may continue to process block 110 where the message is added to a bus driver out-message queue and another timestamp (T3) is stored in memory.
- a transmit interrupt handler may be enabled and a determination may be made when the transmit buffer is free (block 112).
- a timestamp (T4) may be recorded that is associated with the time that the message is ready to be put into the transmit buffer.
- the test node 30f may be configured to store another timestamp (T5) when the message is ready to be transmitted out of the test node 30f.
- the outgoing message is then added to the transmit buffer of the test node 30f.
- the process may continue to process block 120 where the incoming message is added to a bus driver in-message queue and a timestamp (T6) is stored. Thereafter, the process may further include adding the message to an application driver message queue (block 122) and storing another timestamp (T7).
- the application associated with the processing the test message may then start and include the storage of a further timestamp (T8).
- test node 30f After the application has processed the message, and the test node 30f is ready to send a locally processed message out of the test node 30f, the test node may then store another timestamp (T9) (block 126). The process may then continue to blocks 106-118 where the transmit buffer size is checked and, eventually, the locally processed message is added to the transmit buffer.
- T9 timestamp
- the test node 30f may then be configured to calculate performance parameters of the node (such as latency).
- the test node 30f may further be configured to transmit any calculated performance parameters, or the raw data including the stored timestamps, to the diagnostic device 24a for further analysis or presentation to the user 42.
- test mode may stop during the test period.
- the test mode may be stopped by a command from the diagnostic device.
- the test mode may be stopped when a specified condition is satisfied.
- One condition may include a threshold number of test messages or traffic messages sent by the test system.
- Another condition may be duration of time. These conditions may be configured by the user 42 and specified in the control messages generated by the system manager 40. What has been described is a system and method for evaluating the performance in an automotive switch fabric network using a diagnostic interface. The processing flow and timestamps shown in FIG. 5 and 6 are implementation specific.
- test modes may be applied to different configurations and the number of timestamps may increase or decrease depending on the type of measurements that a designer wishes to evaluate. Accordingly, the above description of the present invention is intended to be exemplary only and is not intended to limit the scope of any patent issuing from this application. The present invention is intended to be limited only by the scope and spirit of the following claims.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP05800256A EP1802986A4 (en) | 2004-10-14 | 2005-09-29 | Evaluating the performance of an automotive switch network |
JP2007536712A JP2008517527A (en) | 2004-10-14 | 2005-09-29 | System and method for evaluating the performance of automotive switch configuration networks |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US61867404P | 2004-10-14 | 2004-10-14 | |
US60/618,674 | 2004-10-14 | ||
US11/015,529 US20060083172A1 (en) | 2004-10-14 | 2004-12-17 | System and method for evaluating the performance of an automotive switch fabric network |
US11/015,529 | 2004-12-17 |
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WO2006044128A2 true WO2006044128A2 (en) | 2006-04-27 |
WO2006044128A3 WO2006044128A3 (en) | 2006-07-20 |
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PCT/US2005/034667 WO2006044128A2 (en) | 2004-10-14 | 2005-09-29 | Evaluating the performance of an automotive switch network |
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US (1) | US20060083172A1 (en) |
EP (1) | EP1802986A4 (en) |
JP (1) | JP2008517527A (en) |
WO (1) | WO2006044128A2 (en) |
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Also Published As
Publication number | Publication date |
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EP1802986A2 (en) | 2007-07-04 |
JP2008517527A (en) | 2008-05-22 |
EP1802986A4 (en) | 2010-03-31 |
WO2006044128A3 (en) | 2006-07-20 |
US20060083172A1 (en) | 2006-04-20 |
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