KR100254193B1 - Ct2 wireless telecommunication network capable of displaying a cell range and method for displaying cell area of wireless terminal - Google Patents

Abstract

PURPOSE: A cell region indicatable CT2 radio communication network and a method for indicating a cell region of radio terminal are provided to transmit state information including a resource of base station, a present time and an area code to a user's terminal and to display the state information on the display of the terminal. CONSTITUTION: In step s10, one of available traffic channels is selected by CT2 base station. In step s20, a state indication message about the CT2 base station is transmitted from the CT2 base station to a CT2 terminal via the selected traffic channel. It is checked by the CT2 terminal if the state indication message from the CT2 base station to which the CT2 terminal is registered in the step s30. In step s40, information included in the state indication message is displayed on a display window of the CT2 terminal and a user using the CT2 terminal can determine whether the present position is served by a call service or not. The state indication message includes a cell region of the base station, an available resource of the base station and a cell identifier of the base station.

Description

CT2 WIRELESS TELECOMMUNICATION NETWORK CAPABLE OF DISPLAYING A CELL RANGE AND METHOD FOR DISPLAYING CELL AREA OF WIRELESS TERMINAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone-2 (CT2) wireless communication network. In particular, a cell area is displayed on a CT2 subscriber wireless terminal with a built-in wireless pager, thereby automatically re-registering according to the movement of the wireless terminal. The present invention relates to a CT2 wireless communication network and a cell area display method.

In the conventional CT2 wireless communication system, wireless terminals subscribed to the CT2 system could not confirm whether the current location is a serviceable area according to movement. Therefore, when the subscriber has moved, the subscriber has to artificially request the base station to establish a radio link in order to determine whether the service area is available, and establish a wireless link between the base station and the wireless subscriber.

However, if several subscribers attempt to check whether a service area is available at the same time within a limited radio resource, there is a problem in that the call service cannot be supported to a subscriber who actually requires a call service.

In addition, each base station uses a signal generator to check the allocated coverage of the base station after installing the base station. Also, to display the current time on the display window of the wireless terminal, a real-time processing integrated component must be used. In order to support continuous time flow, power must be supplied continuously even when the terminal is turned off.

However, this power supply has caused a problem that the power consumption of the wireless terminal is facilitated, resulting in a very inconvenient use of the wireless terminal which is essential for long-term portability.

The present invention is to solve the above problems,

When a status indication message including a cell area indication, a resource of a base station, a current time and a region code of a base station is transmitted from a base station to a subscriber's wireless terminal, the wireless terminal displays the information on a display window at the current position. It is an object of the present invention to provide a CT2 wireless communication network capable of displaying a cell area and a method of displaying a cell area of a CT2 wireless terminal to enable a subscriber to check whether a call service is available.

1 is a block diagram of a CT2 wireless communication system according to the present invention.

2 is an internal configuration diagram of a base station according to the present invention.

3A is a diagram illustrating an internal configuration of a wireless terminal incorporating a wireless pager according to the present invention.

3b is a block diagram of a display window of a wireless terminal showing an execution result according to the present invention;

4 is a flowchart illustrating a method for displaying a cell area of a CT2 wireless terminal according to the present invention.

5a, 5b and 5c are message flow charts illustrating a location re-registration process of a pager according to the present invention.

* Explanation of symbols for main parts of the drawings

100a, 100b, 100c: CT2 wireless terminal with a built-in wireless pager

110a, 110b, 110c: base station 120a, 120b, 120c: radio link

130, 131: public switched telephone network (PSTN)

140: wired subscriber 150: wireless call service device

160: network controller 200: base station antenna

205: Distribution combiner 210: Wireless transmitter / receiver

215: Multiplexer 220: Program ROM

225: central processing unit (CPU) 230: digital switch

235: Voice ROM 236: SRAM

240: modem 245: decoder / coder (CODEC)

250: PSTN interface 300: subscriber antenna

305: wireless transmitter / receiver 310: multiplexer

315: Audio 320: Speaker

325: microphone 330: central processing unit (CPU)

335 display window 340 vibration motor

345: EEPROM / RAM 350: Keypad

One preferred embodiment of the CT2 wireless communication network capable of displaying the cell area according to the present invention, which was created to achieve the above object,

A base station which directly transmits / receives information via a wireless link with a wireless terminal, and transmits to the wireless terminal a status indication message including an indication of a current cell area and a cell identifier of an available resource base station of the base station and a current time;

Built-in wireless pager, using the status display message received from the base station to display the current cell area and whether the service support in the current cell area and the current time, and automatically re-register the location of the wireless pager capable of wide area service Performing a CT2 subscriber wireless terminal;

A wireless link for transmitting information between the wireless terminal and the base station;

A public switched telephone network (PSTN) for connecting the base station to another network;

A wired subscriber station subscribed to the public switched telephone network;

A radio calling service device for providing a radio calling service to a radio pager of the radio terminal through the public switched telephone network; And

And a network controller comprising a base station management device and a subscriber management device having configuration information including the area code and time information of the base station.

In addition, a preferred embodiment of the cell area display method of the CT2 wireless terminal according to the present invention, in the cell area display method of the wireless terminal receiving the CT2 wireless communication service from the base station providing the CT2 wireless communication service,

Selecting, by the base station, one available traffic channel from an SRAM that searches and receives received field strengths (RSSI) of all traffic channels available at the current location and lists and stores the least interference channels;

Transmitting a status indication message through the selected traffic channel;

Checking, by the wireless terminal receiving the status indication message, whether the status indication message is a status indication message sent by the service base station of the slot in which the wireless communication terminal is registered; And

If the check result is a status indication message sent by the service base station of the registered slot, in order to allow the user to check whether the current location is a call service area, the information of the status display message is displayed on the display window of the wireless terminal. It includes the step shown.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a network configuration of a CT2 wireless communication system according to the present invention. As shown in FIG. 1, a network of a CT-2 wireless communication system includes a public switched telephone network 130 and 131. A plurality of CT2 base stations (110a, 110b, 110c) connected to the public switched telephone network, a wireless pager built-in wireless terminal (100a, 100b, 100c) provided with services from the CT2 base station, and a network controlling the public switched telephone network; A network controller 160 and a wireless call service device 150 for providing a calling service through the public switched telephone network.

The network of the CT-2 wireless communication system configured as described above is configured to interwork between a conventional CT2 wireless communication system and a conventional wireless calling system. Therefore, there is a wireless call service device 150 for interworking a wireless call system, the wireless call service device 150 and the base station (110a, 110b, 110c) and the like through a modem (MODEM) and a public switched telephone network (130) Data transfer is performed.

The wireless call service device 150 is operated by a typical wireless call service provider, and stores a DB that stores a wireless pager number, an identifier (ID), and a field indicating whether a wide area service is available. Has (Database)

In a conventional pager system, in order to receive a wireless call service in an area where a wide area service is not subscribed to, a process of manually re-registering a mobile pager's mobile area between the pager and the pager service device is required. .

The base station (110a, 110b, 110c) has a built-in wireless transmitter / receiver, and is mainly installed in public places, such as offices, department stores and airports that many people come and go. The wireless terminals (100a, 100b, 100c) with a built-in pager are connected to the public switched telephone network (130) via a wired or wireless transmission path.

For example, when the wireless terminal 100a located in the cell coverage of the base station 110a requests a call service, a wireless link 120a is established between the base station 110a and the wireless terminal 100b. After setting, the base station 110a authenticates the wireless terminal 110b and then performs authorization for the requested service.

Subsequently, when the subscriber of the wireless terminal 100a presses the number of the called subscriber 140, the base station checks the service through the called subscriber's number and sends a DTMF (Dual-Tone Multi-Frequency) signal corresponding to the called subscriber's telephone number. Transmit via PSTN (130). The PSTN 130 determines the location of the called subscriber 140 by using the DTMF signal, and transmits a ring signal to the called subscriber 140.

When the called subscriber 140 hooks off the receiver by the ring signal, a wireless B channel and a wired B channel are established between the wireless terminal 100a and the wired terminal 140, thereby making a call. Becomes possible. The start time of the call for charging is based on the time of inverting the polarity of the tip-ring signal of the line connected from the PSTN 130 to the base station 100a.

On the other hand, a wireless terminal capable of a wireless calling wide area service performs user registration by a wireless registration method when the initial CT2 service subscription. The area code stored in the wireless terminal is registered as a service area code in the database of the call service device 150, and the roaming area code is left blank.

In FIG. 1, the network controller 160 includes a base station management device and a subscriber management device; Various data between the base station apparatuses and the network controller are transmitted through the PSTN using a modem.

Each of the base stations 110a, 110b, and 110c downloads various configuration information from the network controller at the time of initial setting with the wireless terminal. The configuration information includes the area code and time information of the base station. Such information is transmitted along with the status message when the base station's own status message is transmitted to its own cell area.

The present invention uses the status indication message to perform the location re-registration process of the wireless terminal.

2 is a diagram illustrating an internal configuration of a base station according to the present invention, and as shown, an antenna 200, a distribution combiner 205, a wireless transmitter / receiver 210, a multiplexer 215, a central processing unit ( 225), program read only memory (220), static random access memory (SRAM) 236, digital switch 230, voice ROM (voice ROM) 235, modem 240, codec (CODEC) 245 and the PSTN interface 25.

The wired subscriber 140 of FIG. 1 is connected to the PSTN interface 250 in the base station via the PSTN 130. The analog voice signal received through the PSTN interface 250 is encoded by the codec 245 into a PCM signal, and then switched to the multiplexer 215 assigned by the digital switch 230 and transmitted. The radio transmitter 210 modulates the digital signal received from the multiplexer 215 into a radio signal and then sends the signal to the distribution combiner 205. The signal from the distribution combiner 205 is transmitted through the air interface by the antenna 200. Is sent to the subscriber's wireless terminal.

Conversely, the antenna 200 receiving the radio signal from the subscriber's radio terminal transmits the radio signal to the distribution combiner 205. The distribution combiner 205 distributes the radio signals received from the antenna 200 into six signals and transmits the six signals to a maximum of six radio transceivers 210.

The radio transmitter / receiver 210 demodulates the radio signal and transmits the demodulated signal to the multiplexer 215. The multiplexer 215 performs a layer 1 function by using a common air interface protocol for allowing the base stations 110a, 110b, and 110c and the subscriber stations 100a, 100b, and 100c to perform wireless communication with each other. do. That is, the multiplexer 215 separates an information channel (B channel) and a control channel, and converts the B channel, which is an Adaptive Differential Pulse Code Modulation (ADPCM) signal, into a PCM signal to the digital switch 230. The D channel signal is transmitted in the form of a codeword to the CPU 225.

The D-channel data generated by the CPU and the voice signal of the wired subscriber are converted into the PCM signal, transmitted to the multiplexer 215, and then transmitted through the antenna 200 after being multiplexed.

Control of the above operation is performed by the central processing unit (CPU) 225, the call processing program for operating the base station is stored in the program ROM (220). That is, the central processing unit 225 operates by the program of the program ROM 220, and sequentially enables the wireless transmitter / receiver 210 in the base station, so that the traffic channels available at the current location of the base station Received Signal Strength Indicator (RSI) is examined, and the traffic channels with low interference are listed and stored in the SRAM 236 inside the base station. If a call request of the wireless terminal is received, the CPU 225 selects a traffic channel by referring to the information of the listed traffic channels and then proceeds with the call.

In FIG. 1, when the base stations 110a, 110b, 110c make a call with the wireless subscriber, the wireless subscriber information and the call information are stored in the SRAM 238, and the information is stored in the SRAM 238 by the modem. 240 is transmitted to the base station host device.

At this time, the modem 240 converts the digital signal of the base station into an analog signal and transmits it to the base station host apparatus via the PSTN interface 250. The analog signal transmitted by the base station host apparatus via the PSTN converts the digital signal to the base station. To feed. The SRAM 236 is a nonvolatile memory device, which stores base station configuration information downloaded from the network controller 160, call detail information of the CT2 subscriber, various kinds of failure information of the base station, and the like.

Figure 3a is a block diagram showing the internal configuration of a wireless terminal performing a re-registration process according to the present invention.

As shown, the antenna 300 of the wireless terminal is a part that transmits / receives a radio signal from a base station, and is connected to the radio transmitter / receiver 305 to receive a radio signal modulated by the radio transmitter / receiver 305. It transmits to a base station, and supplies a radio signal received from the base station to the radio transceiver 305.

The wireless transmitter / receiver 305 modulates the digital signal received from the multiplexing part 310 into a wireless signal and supplies it to the antenna 300, or demodulates the wireless signal received from the antenna 300 and multiplexes the multiplexer. Send to 310.

The multiplexer 310 performs a layer 1 function by a common air interface (CAI) protocol between a base station and a subscriber wireless terminal in the wireless communication system as shown in FIG. 1. That is, the multiplexer 310 separates the B channel data and the D channel data, converts the B channel signal, which is an ADPCM signal, into a PCM signal, and transmits the converted B channel signal to an audio 315, and the D channel signal is a codeword. Convert it and send it to the CPU.

The D channel data generated by the central processing unit 330 and the voice signal of the CT2 subscriber are converted into the PCM signal by the audio 315 and then transmitted to the multiplexer 310, and the multiplexer 310 transmits the PCM signal to the ADPCM. The signal is converted into a signal and multiplexed with the D channel data sent from the CPU 330.

When the B channel data separated by the multiplexer 310 is transmitted to the audio unit 315, the PCM signal is converted into a PCM signal by the audio unit 315 and is converted into a voice signal to the CT2 subscriber by the speaker 320. Is output. The voice signal input to the microphone 325 is converted into a PCM signal by the audio unit 315 and transmitted to the multiplexer 310.

The vibration motor 340 is a device that vibrates the subscriber when a wireless call and an incoming call are received, and the subscriber may select the tone or vibration method by the speaker through a menu of the terminal.

The operation of the subscriber wireless terminal described above is controlled by the central processing unit 330 and a program for operating the terminal is embedded in the program ROM 345. The central processing unit 330 enables the wireless transmitter / receiver 310 in the wireless terminal to examine the received field strength (RSSI) of the traffic channels available at the current location, and lists the traffic channels with low interference. Store in SRAM. When a call request is generated, the central processing unit 330 selects a good channel from the list of traffic channels and proceeds with the call.

Figure 3b is a view showing the configuration of the display window of the wireless terminal showing the results of the present invention, as shown, the display window of the wireless terminal is a time icon, received field strength display icon, service icon, call available icon, area code It consists of an icon.

4 is a flowchart illustrating a method for displaying a cell area of a wireless terminal according to the present invention, as shown in step S10 of selecting one traffic channel among available traffic channels by a CT2 base station; Transmitting a status indication message thereof through the selected traffic channel (s20); Confirming, by the wireless terminal, whether a status indication message has been received from the service base station of the slot in which the wireless terminal is registered (s30); And displaying information included in the status display message on a display window to confirm whether the current location is an area where call service is available (s40).

The status indication message of the base station includes a message indicating the available resources (line and RF section) of the base station, a cell identifier of the base station, and the like, in addition to the message indicating the cell area indication of the base station. Accordingly, the subscriber's wireless terminal monitors the status display message of the base station to indicate whether the service can be directly supported by the CT2 system as well as displaying the cell area, and also displays the area where the subscriber is located on the screen. Can be.

If the CT2 wireless terminal has a built-in wireless pager and the wireless pager supports wide area service, it will automatically re-register the location of the pager if it is out of the first zone it has registered by monitoring the status message of the base station when the subscriber moves across the region. Can be.

In addition, since the current time information is included in the status display message of the base station, the wireless terminal can display the time information on the display window.

5A, 5B, and 5C illustrate a message processing flowchart of a re-registration process according to the present invention, and the location re-registration process of the wireless terminal according to the present invention will be described with reference to FIG. 1 as follows.

The base station initially downloads the configuration information from the network controller and then switches to the call processing mode 400 (s400), and continues with the received field strength (RSSI) in its cell area to check whether there is a call request from the wireless terminal. Watch. This monitoring is called a scan. At this time, the base station selects idle channels from the monitoring result of the received field strength and makes a list of available traffic channels (402). The list of such traffic channels is updated with new information periodically during the channel scan.

The configuration information downloaded by the base station includes a transmission cycle and a transmission time of the status display message. Accordingly, the base station periodically sets the base station status indication message according to the information (s404), and transmits the message through one traffic channel selected from the available traffic channels (s406).

When the subscriber turns on the wireless terminal, the wireless terminal stores the level while continuously examining the received field strength (RSSI) in order to monitor the base station status indication message transmitted from the base station except when the subscriber requests the call.

As a result of the investigation, if the received electric field strength of a predetermined level or more is detected, the base station which transmits the corresponding electric field strength is checked whether it is the service base station of the registered operator (s410). It ignores the base station and returns to the scan mode for detecting the received electric field strength again (s408).

However, even if the wireless terminal is not a service base station of a registered operator, if the base station enables roaming service by a roaming agreement between operators, the base station including the base station identifier including the service classifier of the operator registered by the wireless terminal may be a base station of another calling service provider. Send the status message together.

If the message includes the same value as the user service identifier stored in the registration slot of the wireless terminal and the cell area indication is included (s412), the wireless terminal displays the received field strength on the display screen (s414). The level display may be displayed in the form of the RSSI icon of FIG. 3B, and may be displayed in multiple steps using a plurality of bars having different sizes.

The wireless terminal then checks the resources of the base station included in the received base station status indication message (s416) and displays them as an SVC (Service) icon of the terminal as shown in FIG. 3B (s418). The icon repeats ON / OFF periodically depending on its existence. If there is no resource, the icon turns OFF. The SVC icon is periodically turned off even when a radio link is set, and is turned on when a radio link is established and a call path is established with a called subscriber.

The status indication message of the base station includes time information downloaded from the network controller and operated in real time in the base station. The wireless terminal receives and confirms the time information from the status indication message (s420), and displays the time on the display screen of the terminal. Represented by an icon (422)

Initially, if the wireless terminal is registered by the wireless user through the base station, the region code n of the base station is stored in the registration slot memory of the wireless terminal. The wireless terminal checks the base station's region code whenever it monitors the base station status indication message. , (s424) Displays the relevant area code on the display window. (s426)

If the wireless terminal in the area code n moves to a base station in the same area code, the wireless terminal returns to the initial scan mode because the area codes are the same (s428).

However, when the wireless terminal moves to another base station within the area code m, the wireless terminal receives the area code transmitted from the other base station. If the currently received area code is different from the previously stored area code, the wireless terminal asks the subscriber to re-register with the current area code (s430).

If the subscriber is OK to the query, the wireless terminal examines the available traffic channels, selects the traffic channel with the least interference, and transmits a link establishment message to the base station (s434).

Depending on the program of the wireless terminal, or as the subscriber selects the terminal's menu, if the area code is different, the wireless terminal can select an available traffic channel to send the radio paging service re-registration request message to the base station without querying the subscriber. have.

The base station uses a different wireless transmitter / receiver when transmitting a base station status indication message than when scanning the received electric field strength of the wireless terminal. Therefore, when the link setting request message of the terminal is received through the wireless transmitter / receiver being scanned (s436), the base station transmits a link setting permission message to the wireless terminal (s438).

The wireless terminal receiving the link grant message from the base station transmits a protocol initialization request message (s442), and the base station receives the message (s444) and then transmits a protocol initialization response message (s446).

When the protocol initialization response message is received from the base station (s448), the wireless terminal transmits a radio call service re-registration request message to the base station. (S450) When the radio call service re-registration request message is received (s452), the base station is wireless. It transmits its area code and radio call service re-registration request message to the call service device (s454).

Upon receiving the area code (i.e. m) and radio call service re-registration request message from the base station (s456), the radio call service device checks the database to confirm that the wireless terminal is a broadband service subscriber and the area code m to the roaming area code. Save it. The radio call service apparatus transmits a re-registration complete message to the base station (s458).

When receiving the re-registration complete message (s460), the base station transmits a radio call service re-registration allowance message to the wireless terminal to inform that the re-registration is completed. (S462) The terminal that receives the radio call service re-registration allowance message from the base station Then, the region code m is stored in the memory of the registration slot (s468).

When the base station receives the re-registration rejection message from the radio call service apparatus, the base station transmits a message related to the re-registration rejection to the wireless terminal. If the radio call service re-registration permission message is not received or the re-registration rejection message is received, the wireless terminal maintains the previous area code n (s466) and displays a text indicating that the re-registration failed on the display screen. .s467

When the subscriber's call is terminated, the wireless terminal transmits a radio link release request message to the base station (s470). When a wireless link release request message is received (s472), the base station transmits a radio link release allowance message to the wireless terminal. (s474) After canceling the currently set wireless link (s480), the display returns to the scan mode (s402).

When the radio link release permission message is received from the base station (s476), the wireless terminal releases the radio link like the base station (s478) and returns to the scan mode (s408).

The present invention relates to a CT2 wireless communication system that enables a wireless terminal to display the current cell area, and also allows a wireless terminal having a wireless pager capable of wide area service to automatically re-register the area code of the current location. Make sure

That is, the present invention allows the subscriber wireless terminal to display a state indicating the serviceable area, etc., and a display message, so that the serviceable area can be identified when the subscriber moves, and thus, the wireless link between the subscriber and the base station at each conventional move. Reduce the traffic volume of the system as a whole by reducing the process of confirming that the service area is set.

Claims (5)

A base station that transmits / receives information directly through a wireless terminal and a wireless link, and transmits to the wireless terminal a status indication message including a current cell area indication, a cell identifier of an available resource base station of the base station, and a current time; ; Built-in wireless pager, using the status display message received from the base station to display the current cell area and whether the current service in the cell area and the current time, and automatically re-register the wireless pager location capable of wide area service A CT2 subscriber wireless terminal; A wireless link for transmitting information between the wireless terminal and the base station; A public switched telephone network (PSTN) for connecting the base station to another network; A wired subscriber station subscribed to the public switched network; A radio calling service device for providing a radio calling service to a radio pager of the radio terminal through the public switched telephone network; And And a network controller comprising a base station management device and a subscriber management device having configuration information including area code and time information of the base station. A method of displaying a cell area of a wireless terminal receiving a CT2 wireless communication service from a base station providing a CT2 wireless communication service, Selecting, by the base station, one available traffic channel from an SRAM that searches and receives received field strengths (RSSI) of all traffic channels available at the current location and lists and stores the least interference channels; Transmitting a status indication message through the selected traffic channel; Checking, by the wireless terminal receiving the status indication message, whether the status indication message is a status indication message sent by the service base station of the slot in which the wireless communication terminal is registered; And If the check result is a status indication message sent by the service base station of the registered slot, in order to allow the user to check whether the current location is a call service area, the information of the status display message is displayed on the display window of the wireless terminal. A cell area display method for a CT2 wireless terminal, comprising the steps shown in FIG. The method of claim 2, wherein the transmitting of the status indication message comprises: And transmitting a status indication message including a cell area indication of the base station, an available radio resource of the base station, and a cell identifier of the base station. The method of claim 2 or 3, wherein the displaying of the status message on the display window of the wireless terminal comprises: The area code of the base station, current time, available service resources of the base station, A method of displaying a cell area of a CT2 wireless terminal, which indicates in a display window of the wireless terminal whether a received field strength (RSSI) of a signal received from the base station, an active power of the wireless terminal, or whether a call is possible at a current location. Claims [1] A method of re-registering a location of a wireless terminal capable of displaying a cell area with a built-in wireless pager capable of wide area service, Downloading the base station configuration information including the area code of the base station and current time information from the network controller during initial setup of the base station; Creating a status indication message according to a state of a channel of a base station; A base station selecting one of the available traffic channels and transmitting the status indication message to a wireless terminal through the selected traffic channel; When the wireless terminal detects a received electric field strength of a predetermined level or higher, checking whether the base station transmitting the detected received electric field strength is a service base station of a wireless calling operator registered by the wireless terminal or another base station capable of roaming service; If the base station of the other operator, ignoring and returning to the scan mode; If the wireless terminal is a service base station of a registered wireless calling operator or a base station of another operator capable of roaming service, the message includes the same value as the operator service identifier stored in the registration slot of the wireless terminal and includes an indication in a cell area. Checking whether it is a status display message; Displaying the received electric field strength level of the status indication message on a display window of a wireless terminal; Identifying a circuit and a radio transmission / reception resource of a base station from the status indication message; Displaying the radio resource information of the base station on a display window of the wireless terminal indicating a current time icon, a received field strength icon, a service icon, a call available icon, and an area code display icon; Periodically checking, by the wireless terminal, the line and the wireless transmission / reception resource of the base station and turning on the service icon if there are available resources; Turning off the service icon if there are no resources available; Periodically turning on / off the service icon when setting a wireless link and turning on the icon when setting a call path; Checking current time information from the received status indication message; Displaying the identified current time as a time icon on a display window of the terminal having a means for representing a time icon, a received field strength icon, a service icon, a callable icon, and an area code display icon; Storing the first area code in the registration slot memory during initial wireless registration of the wireless terminal; Comparing the current area code identified from the received status indication message with the stored area code; If the comparison result is the same, returning the wireless terminal to the initial scan mode; If the comparison result is not the same, inquiring of the subscriber whether the wireless terminal will re-register the current location; If the subscriber shows an acknowledgment (OK), the wireless terminal checking the available traffic channel, selecting the traffic channel having the least interference, and transmitting a radio link establishment request message to the base station; Receiving, by the base station, the radio link establishment request message; Setting, by the base station, a radio link according to the radio link establishment request message, and transmitting a radio link establishment allowance message to the wireless terminal; Receiving, by the wireless terminal, the radio link establishment permission message and transmitting a protocol initialization message to the base station; Receiving, by the base station, the protocol initialization message from the wireless terminal and transmitting a protocol response message to the wireless terminal; Receiving, by the wireless terminal, the protocol response message from the base station, and transmitting a radio call service re-registration request message to the base station; The base station receives the radio calling service re-registration message from the wireless terminal and transmits a radio call service re-registration request message including a code of the subscriber wireless terminal requesting re-registration and an area code of the base station to the wireless call service apparatus. Process of doing; Receiving, by the radio call service apparatus, the radio call service re-registration request message and searching a database to confirm whether the radio call service apparatus is a subscriber of a wide area service; Storing the area code of the base station in a roaming area code part by the radio calling service device if the wide area service permitting subscriber is the confirmed result; Transmitting, by the radio call service apparatus storing the area code of the base station, a radio call service re-registration complete message to the base station; Receiving, by the base station, the radio call service re-registration complete message from a radio call service device, and transmitting a radio call service re-registration allow or reject message to the wireless terminal according to the result; Receiving, by the wireless terminal, a radio call service re-registration allow or reject message from the base station, and if the reception result is re-registration, storing the allowed area code in a memory of a registration slot; Maintaining a previous registration code when the wireless terminal does not receive the result message from the base station or receives a radio call service re-registration rejection message; Displaying the stored current area code on a screen of a wireless terminal having means for displaying a time icon, a received field strength icon, a service icon, a callable icon, and an area code display icon; When the call is terminated by the subscriber, transmitting, by the wireless terminal, a radio link release message to the base station; When the base station receives the radio link release message from the terminal, transmitting a radio link release permission message to the wireless terminal, releasing a currently established radio link and returning to a scan mode; And And when the wireless terminal receives the radio link release permission message from the base station, releasing the currently established wireless link and returning to the scan mode.

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