Exploration, Consolidation, and Evolution of Car Connectivity Technologies: From MirrorLink to ALink

1. Introduction

With the rapid development of the automotive industry and the rise of intelligent vehicles, car‑connectivity (车联) technologies have emerged. This article reviews mainstream car‑connectivity protocols, describes Gaode’s (Amap) exploration and practice in this field, and outlines the evolution of its own hardware products.

Connecting a smartphone to an in‑vehicle system to exchange data is the most mature use case today. In addition to its popular map and navigation services, Gaode has accumulated extensive experience in the vehicle domain and is leveraging its data and application expertise to drive the evolution of car‑connectivity.

2. Exploration

The journey began with version 1.0, when MirrorLink was first implemented at Gaode.

MirrorLink is a standard for integrating smartphones with vehicle infotainment systems, allowing certain apps to run on the phone while the driver interacts via the vehicle’s controls.

Originating from a 2009 Nokia‑Marvell demonstration called “Terminal Mode,” MirrorLink gained industry backing through the Car Connectivity Consortium (CCC). Over 90 vehicle models worldwide support MirrorLink.

Before version 1.0, Gaode had little MirrorLink experience. A product engineer managed to bridge the T‑Box to the vehicle’s USB interface, enabling core video‑touch interaction and delivering the first demo.

Another image shows the early prototype.

Although MirrorLink was an early protocol, its development faced challenges. Nokia, the original champion, withdrew, and Android became the dominant mobile platform for MirrorLink connections. Meanwhile, Google promoted Android Auto and Apple promoted CarPlay, both of which are not part of the CCC.

3. Consolidation

Despite difficulties, the industry continued to develop car‑connectivity solutions: Apple released CarPlay in 2011, Google launched Android Auto in 2014, and Baidu introduced Carlife in 2015.

After gaining practical experience with MirrorLink, Gaode analyzed major car‑connectivity protocols and launched its own ALink protocol (version 2.0), which features an optimized architecture, fast connection establishment, H.264 video compression, QoS support, and reduced bandwidth consumption.

ALink is not limited to smartphone‑vehicle connections; it supports any USB/Wi‑Fi enabled device. The protocol defines multiple logical channels:

Signalling channel – establishes and maintains the encrypted connection, ensuring privacy and rapid state transitions.

High‑speed video channel – transports H.264‑encoded video, capable of handling 60 FPS.

Synthesised audio channel – delivers synthesized voice prompts for devices lacking multi‑track audio mixing.

Media audio channel – carries audio from media applications (music, radio, e‑books) for vehicles with multi‑track mixing.

Navigation broadcast channel – transmits navigation voice prompts.

Voice output channel – outputs audio from voice‑assistant applications.

Voice input channel – sends captured vehicle‑side speech to a speech‑recognition module.

4. Evolution

In the 2.0 stage, ALink was adopted by several major automakers, giving Gaode a proprietary car‑connectivity protocol and strengthening low‑level driver capabilities.

Version 3.0 expands the focus from protocols to a full stack of hardware‑software integrated car‑connectivity products. Collaborating with AliOS and Tmall Genie teams, Gaode released the “Tmall Genie Gaode Edition Smart Car Box,” which runs AliOS, supports multiple protocols, and brings voice assistants and AR navigation into the vehicle.

The team also built full‑stack capabilities from hardware design to kernel drivers, cloud services, and applications.

5. Outlook

Car‑connectivity has matured over a decade, initially linking the vehicle interior with smartphones. Emerging wide‑area wireless technologies (5G, IoT, AI) open new possibilities beyond phones, such as dedicated smart car boxes.

Future automotive innovation will be driven by 5G, IoT, and AI. Gaode’s car‑connectivity technologies aim to lead the new automotive ecosystem, providing entry points for next‑generation vehicle strategies.