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Bluetooth Micro Stack for Automotive Smart Cluster and Digital Cockpit

The connected car era has ushered in new technologies to transform driving experiences. Right now, Bluetooth, Wi-Fi, ZigBee, and various other wireless communication technologies are widely used in the automotive industry.

Two versions of Bluetooth technology are used in automotive applications – Bluetooth Classic and Bluetooth Low Energy (BLE). The Classic version ensures steady and high-quality transmission rate and hence, facilitates exchange of large files. On the other hand, BLE is most suitable for applications that exchange small amounts of data, while ensuring low power consumption.

Our IoT engineering team has developed a ready-to-deploy Bluetooth Classic micro stack that can be integrated with smart clusters, infotainment systems or digital cockpits. This stack is available to customers on a one-time licensing fee model. As per this business model, the customer jointly owns the IP rights of the software as well as the source code of the stack. They may deploy and integrate the Bluetooth stack across multiple projects.

How Does the Bluetooth Micro Stack Work?

The Bluetooth Classic micro stack facilitates the connection of a vehicle owner’s mobile phone to the automobile’s smart dashboard. The phone is paired with the Android based dashboard using passcode pairing. Once the pairing is successful, the call logs and contact information are shared with the smart dashboard. The Bluetooth micro stack facilitates the following functionalities:
Hands-free Calling

1. Hands-free Calling

Message alerts and incoming calls to the user’s mobile phone can be displayed on the dashboard/infotainment screen. Phone book synching is also done.

  1. Through the number keypad on the IVI system, the user can make outgoing calls by dialing specific numbers. These calls will be routed through the mobile phone.
  2. Incoming calls can be accepted or disconnected using the infotainment screen or the mobile screen.
  3. Hardkeys are included in the design to enable making quick calls to frequently used/important phone numbers.

Hands-free calling is implemented using the PBAP (Phone Book Access Profile) and HFP (Hands Free Profile) Bluetooth profiles.

Points to note:

2. Bluetooth Audio

Once the Bluetooth pairing is successful, songs that are played on the phone can be displayed on the infotainment system as well. Playback and pause controls will be available from the IVI screen.

Bluetooth Audio is implemented using A2DP (Advanced Audio Distribution Profile) and AVRCP (Audio/Video Remote Control Profile).

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Points to note:

Smart Cluster Architecture with Bluetooth Micro Stack

The detailed layered architecture of a smart cluster with the Bluetooth micro stack implemented is shown below.
Smart Cluster Architecture

Modular Architecture of Bluetooth Micro Stack

A modular architecture has been followed while developing the stack. So, based on the customer’s unique requirements, specific modules can be implemented. The entire solution need not be implemented together, if that is not required by the customer.

Why Choose Embitel as Your Product Engineering Partner?

Deep domain knowledge in leading-edge automotive and IoT technologies

16+ years of experience in crafting connected vehicle solutions for global OEMs and Tier 1 suppliers

Ready-to-deploy stacks (such as our Bluetooth micro stack) that reduce automotive product engineering timelines significantly

Expertise in custom-designing production-grade automotive solutions with compliance to ASPICE and functional safety guidelines

Industry Experience
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