Mobile communication terminal and positioning method for mobile communication terminal

A mobile communication terminal that acquires position information of a cell to which the mobile communication terminal currently belongs, from a network with which position information of a plurality of cells constituting a wireless area is registered, the mobile communication terminal comprising:

• a communication section that receives, in each cell, position information about the cell to which the mobile communication terminal currently belongs, cell information for identifying the cell, and surrounding cell information about surrounding cells located around the cell;
• a storage section that associates and stores the position information, the cell information and the surrounding cell information received in the communication section;
• a global positioning system section that performs global positioning system positioning based on the position information;
• and
• a control section that decides whether the position information stored in the storage section is valid or invalid, based on a result of comparison between the cell information about the cell to which the mobile communication terminal currently belongs, received in the communication section, and the cell information and the surrounding cell information stored in the storage section.

A positioning method for a mobile communication terminal that acquires position information of a cell to which the mobile communication terminal currently belongs, from a network with which position information of a plurality of cells constituting a wireless area is registered, the positioning method comprising:

• a receiving step of receiving, in each cell, position information about the cell to which the mobile communication terminal currently belongs, and cell information for identifying the cell;
• a storing step of associates and stores the position information and the cell information received in the receiving step;
• a counting step of counting the number of handovers that take place upon move between cells providing different cell information;
• a global positioning system positioning step of performing global positioning system positioning based on the position information;
• and
• a deciding step of deciding whether the position information stored in the storing step is valid or invalid, based on the number of handovers.

A positioning method for a mobile communication terminal that acquires position information of a cell to which the mobile communication terminal currently belongs from a network with which position information of a plurality of cells constituting a wireless area is registered, the positioning method comprising:

• a receiving step of receiving, in each cell, position information of a cell to which the mobile communication terminal currently belongs, cell information for identifying the cell, and surrounding cell information about surrounding cells located around the cell;
• a storing step of associating and storing the position information, the cell information and the surrounding cell information, received in the receiving step;
• a global positioning system positioning step of performing global positioning system positioning based on the position information;
• and
• a deciding step of deciding whether the position information stored in the storing step is valid or invalid, based on a result of comparison between the cell information about the cell to which the communication section currently belongs, received in the receiving step, and the cell information and the surrounding cell information stored in the storing step.