Method and apparatus for updating and providing satellite navigation message

An apparatus, comprising:

• a storage device configured to store a satellite navigation message database;
• and
• control circuitry configured to:
• receive a download report from a receiver, the download report indicating presence or absence of respective information sections of sub-frames of a satellite navigation message currently stored by the receiver, the receiver receiving stored information sections of the satellite navigation message that are indicated as presence in the download report from a satellite;
• determine whether to update the satellite navigation message database using a subset of the stored information sections based on the download report from the receiver;
• and
• in response to determining that the satellite navigation message database is to be updated using the subset of the stored information sections:
• request the receiver to transmit the subset of the stored information sections,
• receive the subset of the stored information sections from the receiver, and
• update the satellite navigation message database based on the received subset of the stored information sections from the receiver.

A system, comprising:

• a receiver configured to:
• receive and store information sections of sub-frames of a satellite navigation message from a satellite;
• and
• transmit a download report, the download report indicating presence or absence of respective information sections of the sub-frames of the satellite navigation message currently stored by the receiver;
• and
• a server configured to:
• receive the download report from the receiver;
• determine whether to update a satellite navigation message database associated with the server using a subset of the stored information sections stored by the receiver based on the download report from the receiver;
• and
• in response to determining that the satellite navigation message database is to be updated using the subset of the stored information sections stored by the receiver:
• request the receiver to transmit the subset of the stored information sections,
• receive the subset of the stored information sections from the receiver, and
• update the satellite navigation message database based on the received subset of the stored information sections from the receiver.