Patent ID: 7313392

Claim:
A mobile station apparatus in a communication system, the communication system comprising a plurality of base stations for providing mobile communication service within a covered communication area, the mobile station apparatus comprising: an RF transmitting/receiving module for transmitting and receiving RF signals to/from the base stations and for receiving a received signal strength indicator (RSSI) from the base stations; a display module for displaying characters or graphs thereon; a memory comprising an RSSI database; and a control program; wherein when the mobile station apparatus moves along a path comprising plural candidates of communication locations, the control program records a plurality of RSSIs, which are received by the RF transmitting/receiving module from the candidates along the communication locations, and at least one path parameter in the RSSI database, and then according to a predetermined display algorithm, the control program controls the display module to display at least one recorded RSSI and the corresponding path parameter as a reference, based on which the mobile station apparatus selects a communication location candidate for providing the mobile communication service; and wherein before the mobile station apparatus actually provides the mobile communication service at a predetermined location, the RF transmitting/receiving module receives the RSSI from the base station at the predetermined location again for confirmation and compares the received RSSI with the previously corresponding RSSI recorded in the RSSI database, and when the signal intensity of the received RSSI is substantially close to or greater than the recorded corresponding RSSI, the display module displays suggestion to conduct the mobile communication service at the predetermined location, otherwise the display module displays the next best communication location candidates recorded in the RSSI database as a further reference for selection.