AGL
  Bluetooth
    HFP(hands free profile)
    A2DP(advanced audio distribution profile)
    PBAP(phone book access profile)
    DUNP(dial up networking profile)
    OPP(object push profile)
    AVRCP(audio video remote control profile)
    MAP(message access profile)
    SPP(serial port profile)
    PANP(pernal area network profile)
    SDP(service discovery profile)
    DIP(device information profile)
    Bluetooth Smart Ready(Bluetooth Low Energy standard)
    GOEP(generic object exchange profile)
    GAVDP(generic audio video distribution profile)
  Error Management
    works by systems have the concept of level importance.
    OOPs selectable memory mappings:
      anonymous private mappings
      anonymous shared mappings
      file-backed private mappings
      file-backed shared mappings
      private huge page
      shared huge page
  Graphics
    HMI input, wayland window etc.
  Location Services
    Location Services include support for GPS.
    Time of day.
      Monotonic time support
      Absolute time support
  Health Monitoring
    watchdog 
    active monitoring 
  IPC
    standard platform IPC
  Lifecycle Management
    startup
    shutdown
    state change
  Network Services 
    include standard networking protocols such as TCP/IP over Wifi/Bluetooth/ethernet.
  Persistent Storage
    
  Power Management
    active/suspend/resume operations
  Resource Management
  
  Telephony Services
    
  Wi-Fi
    Construct WiFi Network
      STA 
    acts as a STA and connects to an external network via an Access Point
      AP
    acts as a AP and connects multiple Wi-Fi devices with an external network
      P2P
    Peer to Peer connection
    Miracast
      Shared Displayed Content
      Remote operations
    DLNA
      
  Window System

Automotive Services 
  Audio Services
  Camara Services 
  Configuration Services 
  Diagnostic Services
  Multimedia Services 
  Navigation Services 
  PIM
  Smartphone Link
    MirrorLink/Miracast/SmartDeviceLink/AirPlay
  Speech Services 
  Tuner Services 
  Vehicle Bus/Vehicle Info Control
    Vehicle Data Processing
    Communication between ECUs
    Vehicle Data Upload Simulator
  Telematics Services 
  Window System

Operating System Layer 
  Kernel
    linux kernel
      LTSI
  Boot Loader 
    
  Hypervisor 
    
  Operating System
    File Systems
    Resouce Control 
    Device Drivers 
      Peripherals
      Graphics Drivers 
      Video Drivers
      Audio Drivers
      Automotive Devices