Method and apparatus for extending of service radius in mobile communication system

摘要

The present invention is a mobile communication by dividing a service area according to the distance between the base station and the mobile station to the normal mode (Normal Mode) and enhanced mode (Extend Mode), and changes the transmission clock during the expansion mode, the mobile station ever possible extension of the service area, as in the system of the service coverage expansion device and method, this invention is attempting to access by the normal mode, and the access failure when adjustments to the initial delay for the mobile station signal transmission clock, switch to the enhanced mode, and by the initial delay attempting to access one adjusts the transmission clock, and access attempts when given access failure and compares the current number of access attempts. Transmission until the case is currently attempting to access the number is less than the number of fixed access attempts after adjustment again as step-by-step level set to transmit clock reaches its attempts to access the adjusted transmit clock, determined in this case is to access failed access attempts repeating the level adjusting process of the clock will be attempting to access. If, when the current access attempt count is equal to or greater than the predetermined number of attempts, the access switch the operation mode to the normal mode and returns to the initial state.