Method, apparatus, and system for searching and selecting network

A method for searching and selecting a network, comprising:

• before acquiring information about a current location of a terminal and radio network information about current location from a stored electronic map according to terminal trigger or regularly, the method further comprises:
• receiving radio network update information sent by a navigation server, wherein the radio network update information comprises radio network information after change about a location whose radio network changes;
• and
• updating radio network information in the stored electronic map according to the radio network update information;
• subsequent to the updating of the radio network information in the stored electronic map, acquiring information about the current location of the terminal and the radio network information about the current location from the stored electronic map according to terminal trigger or regularly, wherein the electronic map comprises a specified area of the current location of the terminal;
• and
• sending the information about the current location of the terminal and the radio network information about the current location to the terminal.

A device for searching and selecting a network, comprising:

• a first receiving module, configured to acquire information about a current location of a terminal and radio network information about the current location;
• a selecting module, configured to:
• if it is obtained that multiple radio networks exist at the current location of the terminal according to the radio network information about the current location, select a network among all radio networks that exist at the current location of the terminal according to a preset network selection rule, wherein:
• the preset network selection rule comprises determining an area set by a user according to an instruction entered by the user, and selecting the network in at least one radio network existing in the area;
• and
• camping on the selected radio network;
• if it is obtained according to the radio network information about the current location that no radio network exists at the current location of the terminal:
• sending by the device for searching and selecting the network, a network search request information according to user trigger or automatically to a radio network search device in the terminal, wherein the radio network search device is configured to perform blind search for radio networks of a current cell and neighboring cells of the terminal, and acquire radio network information about the current location;
• and
• obtaining by the device for searching and selecting the network, blind search results of the information about the current location of the terminal and the radio network information about the current location sent by the radio network search device;
• wherein a data interface for information transmission between the device for searching and selecting the network and the radio network search device is an open standardized interface.

A navigation device, comprising:

• a positioning module, configured to:
• acquire information about a current location of a terminal and radio network information about the current location from a stored electronic map according to terminal trigger or regularly, wherein the electronic map comprises a specified area of the current location of the terminal;
• a second sending module, configured to send the information about the current location of the terminal and the radio network information about the current location to the terminal;
• a third receiving module, configured to:
• before the acquiring information about a current location of a terminal and radio network information about the current location from a stored electronic map according to terminal trigger or regularly, receive radio network update information sent by a navigation server, wherein the radio network update information comprises radio network information after change about a location whose radio network changes;
• and
• an updating module, configured to update radio network information in the stored electronic map according to the radio network update information.