Gnss Power Saving Management; Dpo (Dynamic Power Optimization); Odp (On-Demand Positioning) - Quectel EC20 GNSS At Command Manual

The working procedure of gpsOneXTRA is shown as follows:
Step 1: If gpsOneXTRA is disabled, enable it by AT+QGPSXTRA and restart the module.
Step 2: Confirm the current validity of gpsOneXTRA data by AT+QGPSXTRADATA?.
Step 3: Download xtra.bin or xtra2.bin to the module via HTTP AT command.
Step 4: Inject the correct time by AT+QGPSXTRATIME.
Step 5: Inject the downloaded xtra.bin or xtra2.bin file by AT+QGPSXTRADATA.
Step 6: Others steps see Chapter 1.1.

1.4. GNSS Power Saving Management

EC20 GNSS engine provides power saving solutions by DPO and ODP, thus extending battery life,
maximizing talk and standby time, and enhancing accuracy and TTFF.

1.4.1. DPO (Dynamic Power Optimization)

DPO (Dynamic Power Optimization) is a power-saving solution which attempts to turn off GNSS RF and
other unneeded components. DPO takes effect after configuring <dpoenable> via AT+QGPSCFG. There
are several preconditions to turn on the DPO, shown as below:

All SVs>26dB-Hz must have ephemeris or recent (<3.5 days) XTRA almanac corrections for those
SVs.

Health or UTC information is not transmitted over-the-air.

Valid position and HEPE should be less than 50m and within users' specified value in QoS.

6 SVs>37dB-Hz or 4 SVs>26dB-Hz and have almanac and health for all SVs.
Benefits and impacts of DPO:

When the DPO feature is on and the SV or navigational data cannot be decoded, the GPS receiver
will not be continuous.

During the DPO, the SBAS feature is effectively disabled. The receiver cannot demodulate the SBAS
messages. DPO always takes precedence over SBAS.

TTFF and yield will not be impacted.

1.4.2. ODP (On-Demand Positioning)

When On-Demand Positioning (ODP) is enabled, standalone GNSS positioning will be triggered in the
background. The positions calculated as a result of ODP are not presented to the application, NMEA, or
the network. However, when the on-demand session is operating and the users or network request a
GNSS session, the on-demand session is immediately terminated and the incoming request is
implemented.
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EC20 GNSS AT Commands Manual
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