u-blox LARA-R2 series System Integration Manual

Also see for LARA-R2 series: System integration manual

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u-blox LARA-R2 series System Integration Manual Manual pdf 54 page image

LARA-R2 series - System Integration ManualUBX-16010573 - R02 Objective Specification System descriptionPage 54 of 1481.14 System features1.14.1 Network indicationGPIOs can be configured by the AT command to indicate network status (for further details see section 1.12 andto u-blox AT Commands Manual [2], GPIO commands): No service (no network coverage or not registered) Registered 2G / LTE home network Registered 2G / LTE visitor network (roaming) Call enabled (RF data transmission / reception)1.14.2 Antenna detectionThe antenna detection function provided by the ANT_DET pin is based on an ADC measurement as optionalfeature that can be implemented if the application requires it. The antenna supervisor is forced by the +UANTRAT command (see the u-blox AT Commands Manual [2] for more details).The requirements to achieve antenna detection functionality are the following: an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used an antenna detection circuit must be implemented on the application boardSee section 1.7.2 for detailed antenna detection interface functional description and see section 2.4.2 fordetection circuit on application board and diagnostic circuit on antenna assembly design-in guidelines.1.14.3 Jamming detectionCongestion detection (i.e. jamming detection) is not supported by “02” product versions.In real network situations modules can experience various kind of out-of-coverage conditions: limited serviceconditions when roaming to networks not supporting the specific SIM, limited service in cells which are notsuitable or barred due to operators’ choices, no cell condition when moving to poorly served or highly interferedareas. In the latter case, interference can be artificially injected in the environment by a noise generator coveringa given spectrum, thus obscuring the operator’s carriers entitled to give access to the LTE/3G/2G service.The congestion (i.e. jamming) detection feature can be enabled and configured by the +UCD AT command: thefeature consists of detecting an anomalous source of interference and signaling the start and stop of suchconditions to the host application processor with an unsolicited indication, which can react appropriately by e.g.switching off the radio transceiver of the module (i.e. configuring the module in “airplane mode” by means ofthe +CFUN AT command) in order to reduce power consumption and monitoring the environment at constantperiods (for more details see the u-blox AT Commands Manual [2], +UCD AT command).