Field Notes: Implementing Hardware-in-the-Loop for Autonomous Driving Development on AWS
AWS Architecture BlogField Notes: Implementing Hardware-in-the-Loop for Autonomous Driving Development on AWSby Bryan Berezdivin | on13 OCT 2020| inArchitecture,Automotive,Customer Solutions,Technical How-to|Permalink|ShareSeptember 8, 2021: Amazon Elasticsearch Service has been renamed to Amazon OpenSearch Service.See details.Automotive customers use AWS as their platform for advanced driving assistance systems (ADAS) and autonomous driving (AD) development to accelerate their development cycles and experience faster time-to-market. In the blog post,Autonomous Vehicle and ADAS development on AWS Part 1: Achieving Scale, we illustrated how software in the loop (SiL) and hardware in the loop (HiL) simulations are part of the workflow used to develop and validate safe AD and ADAS functionality. In this post, I run through some of the more common questions and patterns for implementing HiL on AWS, while looking at some of the differences from running your development all on-premises.HiL simulations leverage test drive data and derived synthetic data to develop and validate various functions in the AD software stack.  Test drive log data is ingested and stored inAmazon S3for use for HiL simulations in parallel with other AD development workloads including visualization, processing, labeling, analysis, and model and algorithm development.As such, we see customers exist in a hybrid context with their HiL workloads running on-premises to support customized equipment. For ADAS and ADS customers, this poses a few questions and considerations:What are the recommendations to deploy HiL for AD on AWS?How is this different from what customers were used to on-premises?For hybrid customers, there are assumptions and misconceptions:Do I need to replicate the test drive data locally, and if so, what are the considerations and consequences?For the purposes of brevity, the remainder of this blog post will use the term AD development to encompass ADAS and AD unless specifically called out.HiL Building BlocksSimulations and validations make up an important aspect of AD development. According toRand’s analysis, there is a need to demonstrate safe driving on billions of miles for an autonomous vehicle to have a lower failure rate than a human driver. While this analysis is statistically derived for fully autonomous driving (SAE Level 5), it demonstrates a need for further validation on millions of miles. This pattern is reflected in most ADAS and AD development projects, where software in the loop (SiL) and HiL are used for verification and validation.The following diagram is an illustration of the ISO 26262 V-Model, a product development approach for matching requirements with corresponding tests, where HiL simulation is required for much of system level testing and validation phases on the right side of the overlaid V-Model.Figure 1: V-Model as defined by ISO-26262HiL simulations require a few key elements. The main component is the device under test (DUT), such as one or more electronic control units (ECUs) running the AD software stack. HiL simulations allow customers to put the device under test (DUT) under the rigor of real-world signals found in a vehicle. By providing more accurate environments and scenarios for the DUT, it can be fine-tuned for key performance indicators (KPIs) such as power utilization, response time, and accuracy.The DUT is connected to a “HIL Rig,” a high performance server with multiple expansion boards to connect to various components of the AD system. The various interfaces are identified in Figure 2: High Level Hardware-in-the-loop (HiL) System and Interfaces and include Controller Area Network (CAN), Automotive Ethernet, Low Voltage Differential Signal (LVDS), and PCIExpress. These interfaces emulate the vehicular topology for testing purposes and allow system level validation of the DUT.The HiL Rigs and the corresponding software tooling are offered by companies likeElektrobit,dSpace,National Instruments, andOpal-RT. The HiL systems facilitate time synchronized inputs and outputs to the DUT and measures system performance. These solutions have optimizations for large-scale operations aligned with faster validation cycles for customers. This latter point is relevant when a project requires validation across a large number of miles. Elektrobit provides the ability to orchestrate and deploy large HiL server farms that can be deployed to work in parallel. The larger server farms allow parallel HiL simulations to reduce the time to validate thousands of miles of drive time and assess the key performance indicators (KPIs) for the feature sets. Results can be acted on more quickly and reduce the overall development time.Figure 2: High Level Hardware-in-the-loop (HiL) System and InterfacesThe HIL system loads sensor data derived from test drive logs. These logs vary in format, but often are captured and stored as MDF4, ADTF, rosbag, or other data logger proprietary formats. These are then processed for HIL simulations to implement open-loop and closed-loop simulations.Open loop simulations refer to replay of log data from test drives.Closed-loop simulations rely on the behavior of the system as inputs vary based on new outputs of the simulation.Both open loop and closed loop simulations are part of autonomous driving development, but open-loop simulations require the largest datasets (multiple petabytes on average) due to reliance on the log data from test drives making them a primary concern for deploying HiL in a hybrid manner.Overview of SolutionArchitectures for supporting HIL simulations with AWS for AD development vary based primarily on the networking available at HiL locations. A common pattern for AWS customers is to have the HiL systems directly interfacing with Amazon S3 over high-bandwidth network links leveragingAWS Direct Connect. This is the simplest approach to deploying HiL and avoids hybrid data management of the petabytes of data in Amazon S3 to a local storage system.AWS Direct Connect provides customers options to deploy their HIL rigs at their data center or inAWS colocation facilitieswith low latency connections. AWS has the largest number ofDirect Connection locations and points-of-presence (POPs)to enable low latency connectivity to any of the >24 AWS Regions. The following diagram illustrates a reference architecture leveraging a direct interface from the HiL systems and Amazon S3.Figure 3 : Reference Architecture for Hardware-in-the-Loop (HiL) Direct to Amazon S3As shown in Figure 3, we illustrate the common interfaces, topology, and AWS services used for autonomous driving customers.Amazon S3 is used to store and analyze the test drive logs used by the HiL simulations and also the results from the simulation runs for further analysis.Metadata of test drive data is populated in various database and analytics services, referred to as the data catalogues, with metadata crawlers and processing pipelines that extract from the drive log and test result data on Amazon S3.The data catalogues provide flexible search interfaces for developers and validation engineers or advanced analytics tools. These systems provide keyword search inAmazon Elasticsearchor SQL queries inAmazon RedshiftorAmazon RDSand noSQL interfaces usingAmazon DynamoDB. Amazon Partner Network solutions for these database and analysis tools are common as well, such as those inAWS Marketplace.Validation engineer, data scientists, or developers use these data catalogues to find scenarios for testing. These personas also use the HiL management interfaces to configure and orchestrate the HiL simulation runs on the scenarios identified and ensure traceability.HiL management systems control the HiL Rigs that interface to the DUT and implement the HiL simulations using the test drive logs. The HiL management system then writes results back to S3 for further analysis via various tool chains.A common question AWS customers have is how to determine an optimal hybrid architecture using this approach. The primary factors are properly sized network links to accommodate data sets used by the HiL simulations as well as low latency network links between Amazon S3 and the HiL rigs. As a result, a key factor is ensuring use of an AWS region for your AWS storage that is in close proximity to your HiL testing site(s).Based on current HiL implementations, open-loop simulations can sustain latencies of 30-50 ms RTT. AWS has numerous AWS Direct Connect locations in co-location facilities with latencies <5ms RTT. Sizing for these network links can be calculated based on the expected dataset sizes and the interval of time targeted for simulation run. We show a basic formula used for network sizing.Average_Throughput (Gbps) = Average_Dataset_Size(GB)*8 / Time_Interval (seconds)As an example, for a scenario where an average of 20PB is needed by the HIL rig every 2 weeks, we require ~200Gbps for the AWS Direct Connect bandwidth.Figure 4 shows an example of a high-level architecture supported byElektrobitwith multiple EB 9101 test racks grouped together. This architecture supports multiple ECUs to be tested at once, leveraging drive log data in Amazon S3. This system is controlled with a central management software that allows optimal orchestration to keep the Elektrobit HiL system running optimally.Use cases include:The automated replay of all relevant sensor data with high time precision to ECUCapture of ECU responses including debug dataIntegration of customer components inside the HiL rack for visualization or post-processing.Another common question from AWS customers is whether this architecture is supported for their HiL implementation. Many HiL providers are adding AWS functionality to their software and hardware stacks in response to customers transitioning to cloud for the development platforms. Some vendors still require Amazon S3 as a supported interface in their HiL Rigs. The work needed to accommodate Amazon S3 is usually a small level of effort for any developer by usingAmazon SDKson the HiL rig software stack. If there is a project where this is needed, contact the AWS account teams and your HiL vendors to ensure a successful and cost efficient project implementation.Figure 4: Elektrobit HiL Architecture with AWSAn alternative HiL solution shown in Figure 5 includes Amazon S3 as the primary storage for drive log data and the scale out NAS storage system is located on-premises operating as a cache for the HIL rigs. This is common when the networking options at the HIL site are limited in bandwidth or latency to handle the target datasets and time windows.AWS customers calculate the size of the cache to transfer the entire dataset over the intended time interval. Following is a simple calculation to demonstrate this.Cache_Size(GB) = Average_Dataset_Size(GB) - Average_Throughput (Gbps) /8 * Time_Interval (seconds)In this example, a customer has 40 Gbps AWS Direct Connect available and a 10PB dataset needed for HIL simulations every 2 weeks. Using the preceding formula there is a need for local cache of four PB capable of high read-rates.Figure 5: Reference Architecture for Hardware-in-the Loop (HiL) with Local Cache to Amazon S3In this hybrid architecture there is a need to orchestrate the data movement in line with the needs of the HIL simulation data set. This requires third party software generally or built in functionality into workflow orchestration tools likeApache Airflow. At CES 2019, Dell EMC and AWS illustrated a solution for this hybrid architecture documented in thisshort solution briefusing Isilon as the scale out NAS storage system and DataIQ as the data movement and orchestration mechanism.Any of these architectures can be cost-optimized, and AWS has programs and pricing options for Amazon Direct Connect as well as the other AWS services involved. There areEnterprise AgreementsandMigration Acceleration Programs (MAP)in line with the holistic AD development platform needs, that reduce the costs for hybrid architecture functionality needed in the HiL solutions. One common need is support for AWS Direct Connect “flat rate” pricing option to accommodate the data transfer out (DTO) needs for the HiL workload. If you need details on these programs for your AD development project, contact your AWS account team.ConclusionIn this blog post, we discussed two common architectural patterns for supporting HiL simulations for ADAS and Autonomous Driving development. These help customers decide on the right networking, storage, and hybrid topologies for these systems.HiL systems directly interfacing with Amazon S3 is the most common pattern as you see withElektrobit HiL solutions, but for customers with limited network links the use of a local cache is an option. Autonomous driving customers looking to increase velocity in their SAE Level 2-5 development programs with HiL simulations have achieved success with AWS as the development platform using these patterns. AWS has a team dedicated to autonomous driving, so contact your AWS account team to get a more prescriptive solution for your HiL or related ADAS and AD development needs.Also, check out the Automotive issue of theAWS Architecture Monthly Magazine.Field Notes provides hands-on technical guidance from AWS Solutions Architects, consultants, and technical account managers, based on their experiences in the field solving real-world business problems for customers.TAGS:Field NotesBryan BerezdivinBryan is a World Wide Industry Lead for Autonomous Vehicles at Amazon Web Services (AWS). Bryan works with customers to accelerate their autonomous vehicle development with AWS services and ISV/SI partner solutions targeting incremental cost, time, and complexity optimizations on their system development approaches. Bryan leverages solutions for the entire development workflow from in vehicle components, AV ingest , processing and analytics, labeling, map development, simulations and validations, model and algorithm development, and orchestration and deployment. Bryan previously held senior leadership roles in product and solution management in a variety of industries including big data, HPC, cybersecurity, and IOT leveraging sensors, data processing, analytics, and machine learning mechanisms for the last 15 years.
September 8, 2021: Amazon Elasticsearch Service has been renamed to Amazon OpenSearch Service. See details. Automotive customers use AWS as their platform for advanced driving assistance systems (ADAS) and autonomous driving (AD) development to accelerate their development cycles and experience faster time-to-market. In the blog post, Autonomous Vehicle and ADAS development on AWS Part 1: […]
Bryan Berezdivin
Architecture Automotive Customer Solutions Technical How-to