KR20000035665A - Mobile communication system for homezone service and method thereof - Google Patents

Abstract

PURPOSE: A mobile telecommunication system and method for providing home zone service is provided to respectively pay first and second payments for the conversation in/out the home zone using only one handset. CONSTITUTION: A mobile telecommunication system for providing home zone service comprises a home zone signal generator(100), a base station(60), a visitor location register(130), a mobile switching station(70) and an invoice center(140). The base station(60) receives home zone signals to discriminate whether present location is in or out the home zone in accordance with the strength of the received signal. The visitor location register(130) temporarily stores two kinds of telephone numbers having different payment systems. The mobile switching station(70) receives conversation information, mobile station ID numbers and home zone in/out information, and selects one telephone number corresponding the mobile station ID numbers.

Description

Mobile communication system and method for providing home zone service {MOBILE COMMUNICATION SYSTEM FOR HOMEZONE SERVICE AND METHOD THEREOF}

The present invention relates to a mobile communication system and method for a home zone service in a wireless communication network. In particular, a wireless subscriber uses one terminal and pays a first communication fee in a home zone and is more expensive than the first communication fee outside a home zone. In order to be able to pay a second communication fee, the present invention relates to a system and a method for allowing a second communication service provider to easily distinguish whether a subscriber is in a home zone and provide a service.

Recently, a mobile communication service using a wireless communication has been commercialized, attracting many subscribers. As a result, the number of subscribers has reached some degree of saturation, and now it is tempting wireline subscribers that are competing mobile communication. However, wired networks have been around for a long time, and newly created wireless network operators provide services with separate networks. Wireless and wireline differ in many ways. In general, the sound quality of the wired communication is better than the wireless communication and the wire communication fee is cheap compared to the wireless communication fee, while the wired communication has a problem that can be used only in a limited place (for example, a house). [In this case, a house includes a building and a fence, etc., and represents a small radius of about 20 to 30 meters that can be called by a cordless phone. Hereinafter, the term indicating the radius is referred to as a home zone.] Due to this problem, the wireless network and the wired network cannot be actually integrated, and thus two communication networks have to be used separately. In other words, the subscriber must have a separate telephone because the telephone used in the home cannot be used in the suburbs or in other areas while traveling. As such, it is inefficient and inconvenient for a subscriber to have two telephones and a telephone number for each of them.

Figure 1 is a network configuration when the conventional wired and wireless operators each operate a separate network.

Within the cellular zone 40 where the base station 60 provides service, the subscriber has a first telephone 10 for use in the home and a separate second telephone 50 for use outside the home. . The first telephone 10 receives a wired service provided by a Public Switched Telephone Network (hereinafter referred to as a PSTN) 30 through a wire 20. The first telephone 10 is installed in a house. It can be used only in the house. The second telephone 50 is located in the cellular area 40 and communicates with the base station 60 to receive a wireless service. Reference numeral 70 denotes a mobile switching center. Reference numeral 80 denotes a line between the base station 60 and the mobile switching center 70, and uses an E1 or T1 link. Reference numeral 90 denotes a call path between the mobile subscriber and the wired subscriber as a line between the mobile switching center 70 and the PSTN 30.

2 is a network diagram of a conventional fixed cellular operation.

Fixed cellular functionality gives cellular networks limited functionality so that they can be used only in limited places. This service is used when providing a communication service using wireless in a place where a separate wired hypothesis is difficult, such as a remote island. The fixed cordless telephone 55 is adapted to use a fixed state by modifying the housing of the existing terminal and communicates with the base station 60. The mobile radiotelephone 45 communicates with the fixed radiotelephone 55 as a terminal for mobile communication. The radius of the mobile telephone is limited to around the house and the like. The dashed portion indicated by 65 is the call radius 65 in a fixed cellular environment. The radius where the mobile cordless phone 45 can talk to the fixed cordless phone 55. This radius of call 65 is within a few hundred meters to several kilometers, which is the home zone.

As mentioned above, the fixed cellular scheme is wireless but limited in mobility. That is, it is necessary to make a call with the base station 60 through the fixed cordless phone 55, and the radius with which the mobile cordless phone 45 can talk with the fixed cordless phone 55 is small. However, fixed cellular methods benefit from relatively low rates because they make calls within a fixed home zone. Considering this aspect, in order to attract wired subscribers, it is necessary to lower the call charges as if using wired communication, even if the mobile telephone is used to call in the home zone.

FIG. 3 is a diagram drawn to define a home zone on a network. In other words, a method of locating a subscriber using a wireless network is illustrated.

Base stations 61, 63, 64, 67, 69 are used to identify the home zone as base stations in the vicinity of the subscriber, and base station coverage 71, 73, 74, 77, 79 is used for base stations 61, 63, 64. , 67 and 69 are areas providing services, respectively. The portion indicated by the circle is the groove zone 81. The home zone 81 region indicates an area where signals are commonly received from neighboring base stations 61, 63, 64, 67, and 69. Conversely, it is an area where signals from terminals 10, 50, 55 are commonly received by the neighbor base stations 61, 63, 64, 67, 69. In FIG. 1, the home zone 81 refers to a small space around the telephone 10 in the home. In FIG. 2, the call radius 65 has been described. The space, that is, the call radius 65, means approximately 20 to 30 m from the position where the telephone 10 in the house is installed.

This area cannot be defined like the house in FIG. 1 or the call radius 65 in FIG. 2, but rather a larger area 37.

As described above, in order to determine the location of the terminal, the load of the wireless network is increased because 3 to 8 base stations should always monitor the position of the terminal and notify the mobile switching center to determine the location of the terminal. In addition, subscribers could not simultaneously receive wired and wireless communication services with one terminal, and mobile service providers could not provide efficient billing services.

Accordingly, an object of the present invention is to provide a home zone service in a wireless communication network, in which a wireless subscriber pays a first communication fee for a call within a home zone using a single terminal and a second communication fee for a call outside the home zone. The present invention provides a mobile communication system and a method thereof.

According to an aspect of the present invention, there is provided a mobile communication system for providing a home zone service, comprising: a home zone signal generator for generating a home zone signal, and whether the current location is within or outside the home zone according to its strength by receiving the home zone signal; A mobile wireless terminal for determining a mobile station, a base station communicating with the mobile wireless terminal, a visitor location register for temporarily storing first and second telephone numbers having different rates for any subscriber, and call information and mobile station from the base station. Receiving an identification number and home zone in / out information, and selecting one of a subscriber's first telephone number or a second telephone number corresponding to the mobile station identification number by referring to the visitor location register according to the home zone in / out information. A mobile telephone exchange and the call information and the first telephone number or second telephone number of the subscriber from the mobile switching center; It is characterized by consisting of a billing center that receives the call number and charges for the phone number.

1 is a network configuration diagram when a conventional wired and wireless operator operates a separate network, respectively.

2 is a network diagram of a conventional fixed cellular operation

3 is a diagram drawn to define a home zone on a network;

4 is a diagram illustrating a network configuration when integrated and operating in a wireless network according to an embodiment of the present invention.

5 is a diagram illustrating a communication method between a home zone signal generator and a terminal according to an exemplary embodiment of the present invention.

6 is a diagram for explaining a case where a home zone signal generated by the home zone signal generator has a cellular frequency band.

7 is a diagram for explaining a case where a home zone signal generated by the home zone signal generator has a PCS frequency band.

8 is a flowchart illustrating a method of differentially applying a charging rate according to a result of determining whether a home zone is in or out according to an embodiment of the present invention.

9 is a block diagram illustrating an internal configuration of a terminal for implementing a home zone service in a wireless communication network according to an embodiment of the present invention.

10 is a diagram for describing a method of setting a neighbor base station according to an exemplary embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: telephone in the home 20: landline

30: Public Switched Telephone Network (PSTN) 37: Extensive Home Zone

40: cellular region 45, 50, 150: terminal

55: fixed cordless phone

60, 61, 63, 64, 67, 69, 260, 270, 280: base station

65: call radius in a fixed cellular environment 70: mobile switching center

71, 73, 74, 77, 79, 265, 275, 285: base station coverage

80: line between base station and mobile switching center 81: home zone

90: line between mobile switching center and public switched telephone network

100: home zone signal generator 152: modulator

154: frequency riser 156: transmit power amplifier

158: transmission filter 160: antenna

164: reception filter 168: duplexer

170, 172: frequency down 174: demodulator

176: home zone signal detector 178: signal type changer

180: alarm 190: home zone signal receiver

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description, specific details such as specific frequency bands, call radius, etc. are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific matters. It will be obvious to those of ordinary skill in the field. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

4 is a diagram illustrating a network configuration when integrated and operating in a wireless network according to an exemplary embodiment of the present invention.

The home zone signal generator 100 generates a signal indicating the home zone, and weakens the output to communicate with a terminal located in the home zone. The home zone 81 may be limited to within a fence of a normal home according to the intensity of radio waves radiated from the home zone signal generator 100. The terminal 150 may be used in or out of the home zone 81. The terminal 150 is provided with a landline telephone number (hereinafter referred to as NSN) for billing when making a call in the home zone. In addition, the terminal 150 is provided with a mobile phone number (hereinafter referred to as MDN) for charging when calling outside the home zone 81. The visitor location register 130 (VLR) 130 temporarily stores subscriber information such as terminal information or additional service information. The NSN and the MDN are stored in the VLR 130. In addition, reference numeral 30 denotes a PSTN switching center, 40 denotes a cellular area which is an area where the base station 60 provides a service, and 70 denotes a mobile switching center. Reference numeral 80 denotes a line between the base station 60 and the mobile switching center 70, and uses an E1 or T1 link. Reference numeral 90 denotes a call path between the mobile subscriber and the wired subscriber as a line between the mobile switching center 70 and the PSTN switching center 30. Reference numeral 140 denotes a charging center, which charges using the subscriber's call information and NSN or MDN transmitted from the mobile switching center 70.

According to the present invention, in terms of charging, as shown in FIG. 4, one terminal 150 can be used not only for home use but also for mobile use. The terminal 150 detects a signal emitted by the home zone signal generator 100, determines whether the terminal 150 is within the home zone 81 according to the detected signal strength, and informs the base station 60. This is because the mobile switching center 70 notifies the charging center 140 of the NSN or MDN with reference to the VLR 130 so that the charging center 140 may apply the charging system differently. The allocation of the two telephone numbers here is for billing purposes only, so that the call is not disconnected.

5 is a diagram illustrating a communication method between a home zone signal generator and a terminal according to an exemplary embodiment of the present invention.

When the terminal 150 detects a signal from the home zone signal generator 100, the terminal 150 is located in the home zone. In this case, the frequency used is a frequency used when the terminal 150 accesses the base station 60, that is, a frequency used in the reverse link. This is to ensure that there is no interference with the signal transmitted from the base station 60 to the terminal 150. The home zone signal generator 100 may transmit various modulation signals, and may use approximately 10 signals. By allowing the home zone signal generator 100 and the terminal 150 to selectively use one of various signals by mutual setting, the terminal may be prevented from transmitting false location information by synchronizing with the signal generated by the neighboring home zone signal generator. Can be. In addition, multiple terminals owned by a member of a household may share a single home zone signal generator.

FIG. 6 is a diagram illustrating a case where a home zone signal generated by the home zone signal generator has a cellular frequency band, and FIG. 7 is a diagram illustrating a case where a home zone signal generated by the home zone signal generator has a PCS frequency band.

When using the frequency of the cellular frequency band (particularly, the frequency used for the reverse link) or the PCS frequency band as the home zone signal, it is not necessary to interfere with other communication methods (for example, 900 MHz band of a cordless phone, paging frequency, etc.). As such, the home zone signal generator 100 is not intended for a call, but only a specific signal is generated and the output is low.

8 is a flowchart illustrating a method of differentially applying a charging rate according to a result of determining whether a home zone is in or out according to an embodiment of the present invention.

In step S100, the terminal 150 checks whether a home zone signal is received from the home zone signal generator 100 after initial dialing or during a call. If the check result is receiving the home zone signal, the flow proceeds to step S110 to send a signal to the base station 60 to notify that it is in the home zone. The base station 60, which has been informed that the terminal 150 is in the home zone, notifies the mobile switching center 70 of the home zone with the call information in step S115. Here, the call information refers to a time at which a call started and ended, and a mobile identification number (hereinafter referred to as MIN). In step S120, the mobile switching center 70 notifies the charging center 140 of the call information and NSN use. The NSN is obtained from the VLR 130 by referring to the MIN received by the mobile switching center 70 from the base station 60. In step S125, the charging center 140 calculates the call charge of the terminal 150 based on a first rate (for example, a wire call charge). The calculation result is recorded as charging for the NSN.

On the other hand, if the home zone signal is not received by the terminal 150 in step S100, the process proceeds to step S310 to send a signal to the base station 60 to notify that it is outside the home zone. The base station 60 notified that the terminal 150 is outside the home zone informs the mobile switching center 70 that the mobile station is outside the home zone in step S315 together with the call information. In step S320, the mobile switching center 70 notifies the charging center 140 of the call information and the use of the MDN. The MDN is obtained from the VLR 130 by the mobile switching center 70 with reference to the MIN received from the base station 60. In step S325, the charging center 140 calculates the call charge of the terminal 150 based on a second rate (for example, a wireless call charge). The calculation result is recorded as the charge for the MDN.

According to FIG. 8, when steps S100 to S125 are sequentially performed, a call is started in the home zone and a home zone departure does not occur during a call. In addition, when steps S100 and S310 to S325 are performed sequentially, a call is started outside the home zone and left outside the home zone until the call ends. However, if the former happens to leave the home zone during the call or the latter enters the inside of the home zone during the call, then the billing should be different. Therefore, call information needs to be defined more specifically. That is, a call may be divided into a call start time and a call end time in a home zone, a call start time and a call end time outside a home zone. Here, when the base station delivers the call information to the mobile switching center and the mobile switching center to the charging center is not the core of the present invention, detailed description thereof is omitted.

Checking such as S100 described above may be equally performed in case of call termination as well as in case of call origination. That is, when a call is received from the outside, the terminal 150 checks whether the home zone signal is detected from the home zone signal generator 100, and if the home zone signal is detected, the terminal 150 recognizes this fact before the call set-up. Notify In this case, the mobile switching center 70 recognizing the fact through the base station 60 informs the charging center 140 of the NSN so that the first rate is applied. However, if the home zone signal is not detected, the base station 60 is notified of the fact. In this case, the mobile switching center 70 recognizing the fact through the base station 60 informs the charging center 140 of the MDN so that the second rate is applied.

9 is a block diagram illustrating an internal configuration of a terminal for implementing a home zone service in a wireless communication network according to an embodiment of the present invention.

The modulator 152 modulates the terminal transmission message. In addition, the modulator 152 transmits a result of the home zone signal detector 176, which will be described later, to recognize the home zone signal from the home zone signal generator 100, together with the message to the base station 60. Since an antenna for receiving the home zone signal is not provided separately and the terminal 150 has an existing antenna as it is, the cost due to the portion added to the terminal 150 is very small according to the present invention. Has the advantage.

Frequency riser 154 frequency-converts the signal from modulator 152. The transmit power amplifier 156 raises the output of the signal to be transmitted. The transmit filter 158 filters out-of-band signals to eliminate interference to other frequency bands when the signal amplified from the transmit power amplifier 156 is emitted into the air. The antenna 160 amplifies the signal to be transmitted and sends it out in a constant direction. In addition, the antenna 160 receives and amplifies a signal. The reception filter 164 removes an out-of-band signal from the signal received through the antenna 160. The duplexer 168 is a signal separation unit that separates the signal from the base station 60 and the signal from the home zone signal generator 100. The frequency lowering unit 170 lowers the frequency so that the signal received from the duplexer 168 can be used for communication with the base station 60. The other frequency lowering unit 172 lowers the frequency so that the signal received from the duplexer 168 can be detected by the home zone signal detector 176. Demodulator 174 demodulates the message from base station 60. The home zone signal detector 176 detects a signal generated from the home zone signal generator 100. The signal type changer 178 adjusts the home zone signal detector 176 to be set to a signal type that matches the home zone signal generator 100. This is to prevent tuning to home zone signals from other home zones when using the same method. The alarm 180 outputs an audible sound or operates a light emitting diode (LED) when the home zone signal detector 176 is notified that the home zone signal has been detected, thereby informing the subscriber that the terminal is in the home zone.

Among the above components, the dotted line display portion 190 including the duplexer 168, the frequency lowering unit 172, the home zone signal detector 176, the signal type changer 178, and the alarm 180 is connected to the home zone signal receiver. Corresponding. The home zone signal receiver 190 is an essential component of the present invention, which is added to a conventional terminal to detect a home zone signal and notify the base station 60 of whether the home zone has been departed. The home zone departure notification by the home zone signal receiver 190 will be described in more detail as follows.

If the home zone signal detector 176 does not detect the home zone signal from the home zone signal generator 100 before the call setup at the origination or during the call or the incoming call setup, the terminal 150 notifies the base station 60. In this case, the base station 60 should inform the mobile switching center 70 of the fact so that a different rate of charging can be made thereafter. Whether to leave the home zone, that is, whether the home zone signal is detected is a reverse channel from the terminal 150 to the base station 60-in addition to an access channel or an in-call message transmission to match the protocol when the initial call is established. This is done through a traffic channel that matches the traffic channel.

In the case of the CDMA method, since an order field and an information record field exist in both an access channel and a traffic channel, it is possible to transmit a message for notifying whether to leave the home zone in these fields. Although the order field and the information record field are already reserved for future use in IS-95, the current air interface of CDMA, it is assumed that these two fields may be used. For the order field and the information record field, see Table 6.7.3-1 and Table 6.7.4-1 of IS-95, respectively.

In the case of the terminal 150 as shown in Fig. 9, the use signal is adjusted by the signal type changer 178. As shown in FIG. 5, the home zone signal generator 100 also has such a signal type changer, and the output is made low enough to support only the home zone. When the terminal 150 is in the home zone, the terminal 150 recognizes a signal from the home zone signal generator 100 to inform that the terminal 150 is in the home zone 81 when the terminal 150 calls the base station 60. This is because the call charges are expensive when a call is made outside the home zone 81, so that the subscriber who accidentally leaves the home zone 81 is notified to enter the home zone 81.

10 is a diagram for describing a method of setting a neighbor base station according to an exemplary embodiment of the present invention.

There is a case in which the subscriber freely (involuntarily or deliberately) moves the position of the home zone signal generator 100 to cause a loss or take an unfair advantage. For example, a subscriber may move to a place other than the place where the home zone signal generator 100 is initially registered, install it, and make an environment as if he is talking in the home zone 81 to make a low-cost call. In order to prevent this, it is necessary to confirm whether or not the terminal 150 which is determined to be talking in the home zone 81 is actually in the home zone 81. In order to confirm this in the network, first, as shown in FIG. 10, at least one or more base stations (for example, 1 to 3) of neighboring base stations registered by the subscriber (that is, in the region 81 where the first home zone signal generator 100 is located) are identified. Make a list. The neighbor base station information identified for each subscriber is stored in the subscriber information database shown in Table 1 in the mobile switching center 70.

name address Phone number1 Phone number2 Sector1 Sector2 Sector3 Remarks Hong Gil Dong Bundang-gu 0342-779-8180 011-779-xxxx # 32 # 66 # 96 Mountain Baekdu Hamgyeongdo 0999-999-9999 011-yyy-yyyy # 10 … … … … … … … …

According to Table 1, each subscriber is given an NSN (phone number 1) used for a call in the home zone 81 and an MDN (phone number 2) used for a call outside the home zone 81. In addition, sector information of the base station affecting the subscriber is indicated by using PN code (Pseudo random Noise code) or other information. Each subscriber can have one to three sectors. In FIG. 10, a base station indicated by reference numerals 260, 270, and 280 corresponds to this. If the base station information is one of the base stations 260, 270, and 280 at the time of initial call setup, it is recognized that the terminal is in the home zone 81. The identification of the base station only needs to be performed once at first, which does not place a heavy load on the network. This is because after the call is started, only the signal of the home zone signal generator 100 needs to be checked. Communication must always be made between the home zone signal generator 100 and the terminal 150, because the home zone signal is disconnected when the home zone signal generator 100 is moved during a call.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

The present invention as described above, first, can reduce the load on the network. That is, the base station notifies the mobile switching station to charge the network only when the terminal does not receive a signal from the home zone signal generator, thereby not burdening the network. Second, the home zone can be set more accurately. By installing the home zone signal generator, it is easier to set a certain area for each subscriber. In addition, the space can be adjusted according to the output of the home zone signal generator. Third, it is possible to accurately calculate the cost of wired and wireless calls. Fourth, it is possible to increase the accuracy of the cost charged to the subscriber. This is because the home zone signal generator is located close to the terminal, so that the determination of the home zone will be less.

Claims (19)

In the mobile communication system for providing a home zone service, A home zone signal generator for generating a home zone signal; A mobile wireless terminal that receives the home zone signal and determines whether the current location is within or outside the home zone according to its strength; A base station communicating with the mobile wireless terminal; A visitor location register for temporarily storing first and second telephone numbers having different rates for any subscriber, Receives call information, mobile station identification number, and home zone in / out information from the base station, and refers to the visitor location register according to the home zone in / out information, and refers to the first telephone number or second of the subscriber corresponding to the mobile station identification number. A mobile switching center that selects one of its telephone numbers, And a charging center receiving the call information and the subscriber's first telephone number or second telephone number from the mobile switching center and charging the corresponding telephone number. The system of claim 1, wherein the home zone signal generator generates a signal of a code division multiple access frequency band. The system of claim 2, wherein the home zone signal generator generates a signal having a frequency equal to a reverse link frequency. The system as claimed in claim 1, wherein the home zone signal generator generates a signal in a frequency band of a personal portable communication system. The mobile switching center of claim 1, The mobile wireless terminal checks a cell list including at least one neighboring base station of a region (home zone) where the home zone signal generator is initially located together with the subscriber information, and checks the pseudo noise code information of the base station only at the initial call setup. System to determine where is in or out of the home zone. The system as claimed in claim 1, wherein the home zone signal generator generates variously modulated home zone signals to selectively use one of them by mutual setting with the mobile wireless terminal. 2. The system of claim 1, wherein if the mobile wireless terminal does not detect the home zone signal during initial call setup or during a call, the mobile wireless terminal notifies the base station of the fact through a reverse channel. In the mobile communication system for providing a home zone service, the mobile wireless terminal comprising a home zone signal generator and a mobile wireless terminal for wirelessly receiving a home zone signal from the home zone signal generator and transmitting home zone in / out information to a base station. A signal separator for separating the signal from the base station and the signal from the home zone signal generator among the signals received wirelessly; A home zone signal detector receiving a signal from the home zone signal generator from the signal separation unit and detecting a home zone signal; A modulator for outputting a modulated signal by combining the detected home zone signal with a message to be transmitted; And a transmitter configured to process the modulated signal and wirelessly transmit the modulated signal. The method of claim 8, The home zone signal generator selectively transmits various modulated home zone signals, And a signal type changer for changing the signal type of the home zone signal detector so that the signal detected by the home zone signal detector can be matched with that of the home zone signal generator. The method of claim 8, And a home alarm signal for detecting that the home zone signal detector is within the home zone when the home zone signal detector detects the home zone signal. The method of claim 8, And the alarm generates an audible sound. The method of claim 8, The alarm is composed of a light emitting diode, the mobile radio terminal characterized in that it operates only when the home zone signal is detected or not detected. In the mobile communication system for providing a home zone service, the mobile wireless terminal comprising a home zone signal generator and a mobile wireless terminal for wirelessly receiving a home zone signal from the home zone signal generator and transmitting home zone in / out information to a base station. A modulator for modulating a message to be transmitted and transmitting the home zone signal to the base station together with the message; A frequency riser for frequency converting the signal output from the modulator to generate a transmission signal; A transmission power amplifier for amplifying the transmission signal; A transmission filter for filtering out-of-band signals to remove interference to other frequency bands when the signal amplified by the transmission power amplifier is emitted into the air; An antenna for finally amplifying a transmission signal output from the transmission filter to be transmitted to the air or to amplify a signal received from the air; A reception filter for removing out-of-band signals from signals received through the antenna; A duplexer for separating the signal output from the reception filter into a signal from the base station and a signal from the home zone signal generator; A frequency dropper for frequency-lowering the signal from the home zone signal generator received from the duplexer; A home zone signal detector for detecting a home zone signal from the frequency lowered signal; A signal type changer for changing the signal type of the home zone signal detector so that the frequency of the home zone signal detected by the home zone signal detector matches the frequency of the home zone signal generated by the home zone signal generator; And a home alarm signal for detecting the home zone signal by the home zone signal detector. In the home zone service method of a mobile communication system, A first step of informing the base station of home zone in / out by determining whether a home zone signal is received from the home zone signal generator by the mobile wireless terminal; A second step of transmitting, by the base station, call information, mobile station identification number, and home zone in / out information to a mobile switching center; A third step of the mobile switching center selecting one of a subscriber's first telephone number or a second telephone number corresponding to the mobile station identification number by referring to the visitor location register according to the home zone in / out information; And a fourth process of receiving the call information and the first or second telephone number of the subscriber from the mobile switching center and charging the corresponding telephone number at the charging center. The method of claim 14, And the first telephone number and the second telephone number have different charge rates. The method of claim 14, Wherein said first telephone number is a landline telephone number and said second telephone number is a wireless telephone number. In the home zone service method of a mobile communication system, A first process of performing the following steps before call setup when calling or receiving a call; Step 1: The mobile wireless terminal determines whether the home zone signal is received from an external home zone signal generator and notifies the base station of the home zone in or out. Step 2: The base station delivers the call start time, mobile station identification number and home zone in / out information to the mobile switching center. Step 3: The mobile switching center selects one of the subscriber's first telephone number or second telephone number corresponding to the mobile station identification number according to the home zone in / out information with reference to the visitor location register. After the call setup, if the mobile radio terminal does not notify the base station of the change of home zone in / out, when the call is terminated, the base station transmits a call end time, mobile station identification number and home zone in / out information to the mobile switching center. Process, After the call setup, whenever the mobile radio informs the base station of the home zone in / out change, the following steps are performed, and when the call is terminated, the base station ends the call termination time and the mobile station identification number and the home zone in / out. A third process of delivering out information, Step 1: The base station transmits a call change time, mobile station identification number and home zone in / out information to the mobile switching center. Step 2: The mobile switching center selects the other of the subscriber's first telephone number or second telephone number corresponding to the mobile station identification number according to the home zone in / out information with reference to the visitor location register. And a fourth process of charging the corresponding telephone number by receiving the subscriber's call information and the first telephone number or the second telephone number from the mobile switching center in the charging center. The method of claim 17, The call information includes a call start time or a call change time (s) and a call end time, wherein the call change time is the end time of the call made before the home zone in / out change and the call made after the home zone in / out change. Characterized in that the start time. The method of claim 18, And the first telephone number and the second telephone number have different charge rates.