Patent ID: 8855650
Filing Date: 2014-10-07
Classification: G01S,H04W

Abstract:
1. A communication system in which a network side and a plurality of mobile station apparatuses communicate with each other through a base station apparatus, wherein the mobile station apparatus comprises: a position information acquisition means for acquiring position information regarding the mobile station apparatus; a search means for searching for a cell of the base station apparatus; a quality information detecting means for detecting quality information of radio communication regarding the cell searched for by the search means; a quality information transmitting means for transmitting the position and quality data, in which the position information acquired by the position information acquisition means and the quality information regarding each cell detected by the quality information detecting means are associated with each other, to the network side; a quality information receiving means for receiving the quality information regarding each cell corresponding to the position information regarding the mobile station apparatus transmitted from the network side; and a cell selecting means for selecting a cell on the basis of the quality information regarding each cell corresponding to the position information regarding the mobile station apparatus received by the quality information receiving means, and the network side comprises: a network side quality information receiving means for receiving the position and quality data in which the position information transmitted from the mobile station apparatus and the quality information regarding each cell are associated with each other; a network side quality information storage means for adding up the position and quality data from the plurality of mobile station apparatuses, creating a database regarding radio quality from the added position and quality data in which the position information of the mobile station apparatus, the cell and the quality information are associated with each other, and updating the database by periodically requesting a transmission of the position quality data to the mobile station apparatus; and a network side quality information transmitting means for transmitting the quality information regarding each cell, which corresponds to the position information regarding the mobile station apparatus, to the mobile station apparatus on the basis of the database stored in the network side quality information storage means, when there is an inquiry about the position and quality data from the mobile station apparatus, wherein the network side further comprises: a position range storage means for storing a plurality of position ranges set for the position of the mobile station apparatus; and a data processing means for averaging the quality information regarding each cell, which corresponds to the position information included in the position range, for every position range stored in the position range storage means on the basis of the data received from a plurality of mobile station apparatuses by the network side quality information receiving means and storing the result in the network side quality information storage means, and wherein the mobile station apparatus, when it is determined that the radio quality of the cell during call connection has deteriorated to become less than the required quality, receives the quality information regarding each cell which corresponds to the position information regarding the mobile station from the network side, and selects a candidate cell to shift to and conducts the radio quality measuring by using the received quality data, and when it is determined that the candidate cell to be shifted to has better quality than the cell during call connection, executes cell shift processing.