1. Field of the Invention
The present invention relates to a mobile communication terminal, and more particularly a mobile communication terminal transmitting a random access channel (RACH) signal and a method thereof.
2. Description of the Related Art
Generally, each base station in a cell in a mobile communication network broadcasts a broadcast control channel signal to the mobile communication terminals by means of a broadcast control channel (BCCH). The BCCH is a downlink channel transmitted in a single direction in a point-to-multi point method and is a channel used for notifying the mobile communication terminals of general cell information. All mobile communication terminals are required to receive a BCCH signal before connecting to a mobile communication network. Conventional mobile communication terminals synchronize with the strongest BCCH signal received from base stations in each cell. Then, when a user makes a request for a network connection such as communication or data downloading, the conventional mobile communication terminals originate RACH signals and perform a call allocation request. The RACH is an uplink channel transmitted in a single direction and is a channel used for transmitting a message such as a response message to a call allocation request or question from a network.
When originating the RACH signals as described above, the conventional mobile communication terminals have always originated the RACH signals at the maximum power level regardless of their own positions. However, since the mobile communication terminals originate the RACH signals at the maximum power level, the power of terminals is unnecessarily consumed and the interference effect occurs in a mobile communication network.