Integration Manual

LISA-U2 series - System Integration Manual
UBX-13001118 - R25 Features description Page 151 of 182
3.11 Control Plane Aiding / Location Services (LCS)
☞ Not supported by the "01", "x2", "63" and "68" product versions
With the Assisted GPS feature, a location server provides the module with the GPS system
information that otherwise needs to be downloaded from satellites. The feature allows faster position
fixes, increases sensitivity and reduces module power consumption. The feature is invoked by the
module through LCS Supplementary Services or by the Network during emergency calls.
The assisted GPS Location Services feature is based on the Radio Resources Location Protocol
(RRLP), according to 3GPP TS 44.031 [26], and Radio Resource Control (RRC) according to 3GPP TS
25.331 [27].
For more details, see the u-blox AT Commands Manual [2].
3.12 Firmware update Over AT (FOAT)
3.12.1 Overview
This feature allows upgrading the module firmware over the UART, USB and SPI interfaces, using AT
Commands.
 The AT Command AT+UFWUPD triggers a reboot followed by the upgrade procedure at a specified
baud rate
 The Xmodem-1k protocol is used for downloading the new FW image via a terminal application
 A special boot loader in the module performs FW installation, security verifications and module
reboot
 Firmware authenticity verification is performed via a security signature during the download. The
firmware is then installed, overwriting the current version. In case of power loss during this phase,
the boot loader detects a fault at the next wake-up and restarts the firmware download from the
Xmodem-1k handshake. After completing the upgrade, the module is reset again and wakes up in
normal boot mode
3.12.2 FOAT procedure
The application processor must proceed in the following way:
 Send the AT+UFWUPD command through the UART or over the USB interface, specifying the file
type and the desired baud rate
 Reconfigure the serial communication at the selected baud rate, without flow control with the
Xmodem-1k protocol
 Send the new FW image via Xmodem-1k
For more details about Firmware update Over AT procedure, see the u-blox AT Commands Manual [2]
and the Firmware Update Application Note [16].
3.13 Firmware update Over the Air (FOTA)
☞ Firmware update Over the Air (FOTA) is supported only by the “8x” product versions.
This feature allows upgrading the module firmware over the 3G / 2G air interface. The firmware
installation procedure triggers the firmware update installation via AT command, starting from an
update file stored in the module’s file system. In order to reduce the amount of data to be transmitted
over the air, the implemented FOTA feature requires downloading only a “delta file” instead of the full
firmware. The delta file contains only the differences between the two firmware versions (old and
new). For more details about the Firmware update Over the Air procedure, see the Firmware Update
Application Note [16] and the u-blox AT Commands Manual [2], +UFWINSTALL AT command.