Mobile communication system and location registration method in mobile communication system.

摘要

The present invention is intended to grasp a moving speed of a mobile station and to self-control a location registration request from the mobile station that is in motion at high speed, to thereby alleviate an increased burden that is imposed upon the system due to a concentration of a lot of location registration requests. A mobile station which executes a location registration processing by using the channel quality of a base station and an information concerning a base station includes a base station information memory unit (7) for storing therein information concerning a plurality of base stations and an amount in which the channel quality of the base station is changed with time and a location judging unit (8) for judging on the basis of the amount in which the base station information is changed with time and which is stored in the base station information memory unit (7) whether or not the location registration processing is executed and a location in service area. Since whether the location registration processing is to be executed or not is determined in accordance with the moving speed of the mobile station, it is possible to limit the occurrence of a location registration request which becomes invalid with a large possibility in a short period of time because the mobile station moves to other location registration area or to the calling area in a short period of time. Therefore, a traffic of the location registration request can be lowered. In consequence, a frequency at which the location registration requests are collided can be lowered and a ratio with which a location registration request from the mobile station that is in a stationary state or in motion at low speed, can successfully become valid can be increased. Furthermore, since the frequency in the location registration request can be lowered, an amount of unnecessary electric power consumption of the mobile station can be reduced. <IMAGE>