Abstract:
A method of demanding registration of a Wireless Local Loop (WLL) terminal by displaying a message on a display comprising the steps of detecting whether the power is turned on, detecting whether a registered electronic serial number (ESN) and phone number are stored in a memory, and displaying the message which demands registration when no registered identification data is detected.

Description:
CLAIM OF PRIORITY 
     This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §1.19 from an application entitled METHOD OF DISPLAYING A MESSAGE TO DEMAND REGISTRATION ON A WIRELESS LOCAL LOOP TERMINAL earlier filed in the Korean Industrial Property Office on Jun. 20, 1998, and there duly assigned Serial No. 23291/1998. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a method of demanding registration of a WLL (Wireless Local Loop) by displaying a message on a display when the terminal is not registered with a communication service provider. 
     2. Description of the Related Art 
     A WLL terminal typically displays various messages including the received electric field strength, present time and date, etc. However, the terminal does not indicate whether it is registered with a communication service company or not. Hence, when a user attempts to establish a communication through a WLL terminal which is not registered with a communication service company, the terminal will not work. The user may then wrongly assume that the terminal is malfunctioning or the base station can not provide proper services. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a method of demanding registration of a WLL terminal by displaying a message on a display of the terminal when the terminal is not registered with a communication service company. 
     In accordance with an embodiment of the present invention, a method of demanding registration of a WLL terminal with a memory by displaying a message on a display, comprises the steps of: detecting whether the power is turned on; detecting whether a registered electronic serial number (ESN) and phone number are stored in the memory; and displaying a message which demands registration when no registered identification number is stored in the memory. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
     FIG. 1 is a block diagram illustrating the structure of a WLL terminal in accordance with the present invention; and 
     FIG. 2 is a flow chart illustrating the steps for displaying a message which demands registration on a WLL terminal in accordance with the present invention. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Referring to FIG. 1, a WLL terminal comprises a controller  100 , a transceiver  110 , a base band analog circuit (BBA)  120 , a display  130  and a key input device  140 . The controller  100  is a mobile station modem (MSM) which preferably includes an Intel 80186 CPU as a core element, for use in a CDMA (Code Division Multiple Access) PCS (Personal Communication System). The MSM is comprised of a RAM, a ROM and a EEPROM, and controls the functions of the terminal in response to a clock signal CLK from the BBA  120 . The ROM stores a program for controlling the terminal, and the RAM stores flag information, call processing data, timer data, etc. The EEPROM stores the name, power level, volume label, ESN, phone number, etc. The ESN is an identification number which identifies the terminal when the terminal is connected with the base station, and is different from the general phone number. The ESN and phone number are provided by the communication service provider, and when stored in memory are a form of registered identification data. 
     The transceiver  110  essentially comprises a power amplifier, a drive amplifier, an up/down converter, a buffer, a tx/rx intermediate automatic gain control amplifier, a radio frequency band pass filter, and an intermediate saw band pass filter. The power amplifier is used to amplify a signal transmitted from the terminal to the base station. The drive amplifier is used to deliver a signal of sufficient level to the power amplifier. The up/down converter is used to increase or decrease the frequency of a signal transmitted or received. The buffer serves as an amplifier to deliver a signal to the local input of the up/down converter, the signal being phase-locked between the voltage controlled oscillator and the PLL (Phase-Locked Loop). The transceiver  110  includes a duplexer for separating the transmitted signal and the received signal and a thermistor providing compensation for temperature changes. 
     The BBA  120  essentially comprises an analog to digital converter, a digital to analog converter, a low pass filter, and a divider voltage controlled oscillator. The BBA  120  is used to connect the transceiver  110  with the controller  100 . A signal received by the transceiver  110  is transferred through an intermediate frequency automatic gain control amplifier and a filter, and is converted into a digital signal via the analog to digital converter, which is then transmitted to the controller  100 . Conversely, the digital signal transmitted from the controller  100  is converted by the transceiver  110  into an analog signal, which in turn is converted through a frequency filter into an intermediate signal. The display  130 , preferably an LCD, displays the operational state of the terminal, the procedure of the execution program, and the message which demands registration according to the present invention. The key input device  140  includes a plurality of numeric keys and various functional keys to externally input key data to the controller. 
     FIG. 2 illustrates the steps for displaying the message which demands registration on the display  130  of the terminal. In step  200  the controller  100  determines whether the power is turned on. If the power is turned on, the controller  100  then determines whether the ESN is stored in the EEPROM, thereby indicating the ESN is registered. If the ESN is not registered, a message is displayed on the display  130  which demands registration in step  240 . If the ESN is registered, the controller determines, in step  220 , whether a phone number is stored in the EEPROM, thereby indicating the phone number is registered. If the phone number is not registered, a message is displayed on the display  130  which demands registration in step  240 . If the phone number is also registered, the controller  100  performs the normal functions of the terminal. In step  240 , the controller  100  displays the message which demands registration on the display  130 . The message may be displayed as, for example, “Please register the terminal!” and may optionally be accompanied by a beep through the speaker. Of course, any one of steps  210  or  220  may optionally be omitted since the registration of the terminal will generally result in assigning both the ESN and the phone number. 
     While the present invention has been described in connection with the specific embodiments herein and accompanied by the attached drawings, it will be readily appreciated by those skilled in the art that various changes in form and detail may be made thereto without departing from the spirit and scope of the present invention as defined by the appended claims.