LISA-U2 series - System integration manual
UBX-13001118 - R27
Features description
Page 153 of 183
C1-Public
3.17
SIM Access Profile (SAP)
SIM access profile (SAP) feature allows LISA-U2 modules to access and use a remote (U)SIM card
instead of the local SIM card directly connected to the module (U)SIM interface.
LISA-U2 modules provide a dedicated USB SAP channel and dedicated multiplexer SAP channel over
UART and SPI for communication with the remote (U)SIM card.
The communication between LISA-U2 modules and the remote SIM is conformed to the client-server
paradigm: LISA-U2 module is the SAP client establishing a connection and performing data exchange
to an SAP server directly connected to the remote SIM that is used by the LISA-U2 module for
GSM/UMTS network operations. The SAP communication protocol is based on the SIM Access Profile
Interoperability Specification
☞
LISA-U2 modules do not support the SAP server role: the module acts only as an SAP client.
A typical application using the SAP feature is the scenario where a device such as an embedded car-
phone with an integrated LISA-U2 module uses a remote SIM included in an external user device (e.g.
a simple SIM card reader or a portable phone), which is brought into the car. The car-phone accesses
the GSM/UMTS network using the remote SIM in the external device.
LISA-U2 modules, acting as an SAP client, can be connected to an SAP server by a completely wired
connection, as shown in
Device including LISA
GSM/UMTS
Interface
SAP
Serial Interface
(USB SAP channel,
or MUX SAP channel
over UART or SPI)
Local SIM
(optional)
LISA module
SAP
Client
Application
Processor
Device including SIM
SAP
Serial Interface
Remote SIM
Mobile
Equipment
SAP
Server
Figure 70: Remote SIM access via completely wired connection
As stated in the SIM Access Profile Interoperability Specification
, the SAP client can be
connected to the SAP server by means of a Bluetooth cellular link, using additional Bluetooth
transceivers. In this case, the application processor wired to the LISA-U2 modules establishes and
controls the Bluetooth connection using the SAP profile, and routes data received over a serial
interface channel to data transferred over a Bluetooth interface and vice versa, as shown in
Device including LISA
SAP
Serial Interface
(USB SAP channel,
or MUX SAP channel
over UART or SPI)
GSM/UMTS
Interface
Local SIM
(optional)
LISA module
SAP
Client
Application
Processor
SAP
Bluetooth
Interface
Bluetooth
Transceiver
Device including SIM
Remote SIM
Mobile
Equipment
SAP
Server
Bluetooth
Transceiver
Figure 71: Remote SIM access via Bluetooth and wired connections