LISA-U2 series - System integration manual
UBX-13001118 - R27
Features description
Page 144 of 183
C1-Public
3
Features description
3.1
Network indication
Alternatively from their default settings, the
GPIO1
,
GPIO2
,
GPIO3
,
GPIO4
or
GPIO5
can be configured
to indicate the network status (i.e. no service, registered home network, registered visitor network,
voice or data call enabled), by means of the AT+UGPIOC command.
For a detailed description, see section
and to u-blox AT commands manual
, GPIO commands.
3.2
Antenna detection
Antenna presence detection capability is provided, evaluating the resistance from the
ANT
pin to GND
by means of an internal antenna detection circuit. The external antenna assembly must be provided
with a built-in resistor (diagnostic circuit) to be detected.
The antenna detection feature can be enabled through the +UANTR AT command.
For more details regarding feature description and diagnostic circuit design-in, see section
the u-blox AT commands manual
3.3
Jamming Detection
In real network situations, modules can experience various kind of out-of-coverage conditions: limited
service conditions when roaming to networks not supporting the specific SIM, limited service in cells
which are not suitable or barred due to operator choices, no cell condition when moving to poorly
served or highly interfered areas. In the latter case, interference can be artificially injected in the
environment by a noise generator covering a given spectrum, thus obscuring the operator’s carriers
that are entitled to give access to the GSM/UMTS service.
The Jamming Detection Feature detects such
“artificial” interference and reports the start and stop
of such conditions to the client, which can react appropriately by e.g. switching off the radio
transceiver in order to reduce power consumption and monitoring the environment at constant
periods.
The feature consists of detecting, at the radio resource level, an anomalous source of interference
and signaling it to the client with an unsolicited indication when the detection is entered or released.
The jamming condition occurs when:
•
The module has lost synchronization with the serving cell and cannot select any other cell
•
The band scan reveals at least n carriers with a power level equal or higher than the threshold
•
On all such carriers, no synchronization is possible
The number of minimum disturbing carriers and the power level threshold can be configured by the
client by using the AT+UCD command
The jamming condition is cleared when any of the above mentioned statements does not hold.
The congestion (i.e. jamming) detection feature can be enabled and configured by the +UCD AT
command (for more details, see the u-blox AT commands manual
