JP2012044503A - Communication system, communication method, and application server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement mobile public telephone service with an IP network.SOLUTION: A communication system 1 comprises: an AS 7 transmitting an outgoing call from a mobile public telephone 54 through a base station 2 to a subscriber server 6a as a destination accommodating a connecting destination user through an IP network 3; an IP conversion device 9a converting a signal from a subscriber telephone 11 to a signal on the IP network 3; an IP-ICT device 10 transmitting an SIP signal by converting a signal controlling an incoming call from the mobile public telephone 54; and an IP conversion device 9b converting an analog audio signal from the mobile public telephone 54 to an IP packet. The AS 7 has the base station 2 transmit a charging pulse by: adding a mobile public parameter showing the outgoing call from the mobile public telephone 54 and charge area information of the base station 2 through which the outgoing call passes, to the SIP signal as its header or its parameter; and transmitting a charging pulse instruction to the IP-ICT device 10 after call establishment.

Description

  The present invention relates to a communication system, a communication method, and an application server for providing a public telephone service from a vehicle.

  Conventionally, in a public telephone service from a moving vehicle such as a train or a ship provided on a public switched telephone network (PSTN), a public telephone (hereinafter referred to as a mobile public telephone or a mobile public) mounted on the vehicle is used. Calls from telephones are transmitted from the base station via radio, etc., through the subscriber exchange (hereinafter referred to as “GC”) that accommodates the base station, and via the relay exchange (hereinafter referred to as “IC”) to the connected subscriber. Connected to the GC containing the terminal. In addition, a base station that communicates wirelessly with a mobile public telephone in a train or a ship and a GC provided on the carrier (communication carrier) side are connected by an analog individual line (for example, Patent Document 1). Non-Patent Document 1).

JP-A-6-252833

“NTT Technology Library HP”, [online], [searched July 16, 2010], Internet <URL: http://www.hct.ecl.ntt.co.jp/exhibit/technologies/pdf/3_I_5_1- 1.pdf>

  However, the conventional mobile public telephone service is a service for the PSTN network, and is not constructed to provide a mobile public telephone service in an IP (Internet Protocol) network.

  Here, in order to highlight the problem of providing the mobile public telephone service over the IP network, the connection operation in the PSTN network of the conventional mobile public telephone service will be described with reference to FIG. . FIG. 10 is a block diagram schematically showing the flow of a mobile public telephone service in a conventional PSTN network. As shown in FIG. 10, an antenna 53 is laid along a track 52 on which a train 51 travels. In addition, a mobile public telephone 54 is mounted in the train 51, and a base station 55 and a mobile public telephone 54 disposed in, for example, a train monitoring center are connected via an antenna 53.

  In the communication system in the conventional PSTN network 50, first, in step S51, an incoming telephone number (for example, 0A to J) is dialed and transmitted from the mobile public telephone 54 in the train 51. Next, in step S52, the base station 55 connects the signal from the mobile public telephone 54 to the opposite GC 56. That is, the base station 55 connects the signal from the mobile public telephone 54 (transmission from the mobile public telephone opposite line) to the GC 56 by the call connection process 58 via the analog line 57. Next, in step S53, the GC 56 recognizes the mobile public telephone call (mobile public telephone opposite line transmission). That is, the GC 56 recognizes the incoming line from the base station 55. Then, the GC 56 determines whether the connection destination is a connectable network from the incoming telephone numbers (reception numbers A to J). When it is determined that the connection destination is a connectable network, in step S54, the GC 56 acquires area information (CA information) corresponding to the incoming line from the base station 55, and a connection instruction signal (IAM: Initial Address). Set CA information in (Message). Here, for each line (analog line 57) of the connected base station 55, the GC 56 holds area information (CA information) that accommodates the base station 55. This area information indicates information related to the area for calculating the call charge (charge area information).

  Subsequently, in step S55, the GC 56 extracts information (billing rate) necessary for billing by the following processing. As a premise, the GC 56 holds a “mobile public telephone distance-MBI conversion data table” and a “mobile public telephone charging seconds data table” as information tables for extracting charging rates. Here, the MBI value is a value indicating a charging condition, and for each value, a condition such as “the charge is y yen for a call every x seconds” is determined.

  In order to extract the billing rate, first, the GC 56 acquires billing transmission point information (calling KAN) from the area information (CA information). Here, the originating KAN is 8-digit binary information, and indicates a specified point (coordinates x, y) for accounting of the originating GC. Further, the GC 56 obtains information on the incoming base point for charging (the incoming KAN) from the connected telephone number (the incoming telephone number). Then, the GC 56 extracts the distance between the two points (distance for mobile public telephone) from the information of the originating KAN and the terminating KAN. Then, the GC 56 searches the “distance for mobile public telephone-MBI conversion data table” using the distance information as a key, extracts the MBI value, and further uses the extracted MBI value as a key to select “billing seconds for mobile public telephone. The “number data table” is searched, and “unit number of seconds” for charging is extracted as the charging rate.

  Subsequently, in step S56, the GC 56 performs "calling user type" in the connection instruction signal (IAM) so that it can be known that the caller is "mobile public telephone" when making an incoming connection in the same way as a general call. “Public (street)” is set in “Parameter of”, and “Mobile public” is set in the parameter of “Fixed additional user type 1”. These two parameters are parameters indicating “public telephone”.

  Subsequently, the GC 56 determines from the connection destination telephone number (incoming telephone number) whether or not the connection destination of the mobile public telephone call is connected under its own GC. For example, when it is determined from the connection destination telephone number that “the connection destination is connected to its own GC”, the GC 56 performs a call connection process 60 to the subscriber telephone (receiving terminal) 59 in step S57. Thus, the incoming call processing is performed (first case).

  On the other hand, when it is determined from the connection destination telephone number that “the connection destination is not connected to its own GC”, the GC 56 transfers the mobile public telephone call to the ICs 62 and 63. The ICs 62 and 63 transfer from the connection destination telephone number to “GC 64 to which the connection destination is connected”. Then, the connected GC 64 at the connection destination performs an incoming call process on the subscriber telephone (incoming terminal) 65 in the step S57A (second case). That is, in the second case, the GC 56, ICs 62, 63, and GC 64 perform the call connection process 60. Hereinafter, the processing of the first case will be described.

  Subsequent to step S57, after responding to the receiving terminal, in step S58, the GC 56 sends to the base station 55 an MF signal (charging pulse signal: hereinafter simply referred to as a charging pulse) indicating a charging instruction and charging timing. And billing calculation (billing pulse counting). The MF (Multi Frequency) signal is a signal that combines two frequencies. Here, some base stations perform autonomous charging. In this case, the GC 56 performs only charging pulse counting and does not transmit charging pulses to the base station 55. Although details of the billing process will be described later, the GC 56 holds a frequency meter for the billing process for each mobile public telephone facing line. When the call is disconnected, in step S59, the GC 56 adds the call frequency to the frequency meter of the target mobile public telephone line. As will be described later, the value of the frequency meter is the sum of the count value for the response and the accounting pulse count value for the call.

  When charging is performed by calling from the mobile public telephone 54, a charging instruction signal (charging pulse) is sent from the GC 56 to the base station 55. However, some base stations can perform autonomous charging. Sending may not be necessary. The mobile public telephone 54 can cope with both patterns by controlling whether or not a billing pulse is transmitted from the network side (from the GC 56) according to the type of the base station.

  A conventional charging operation will be described with reference to FIG. Coins, prepaid cards, and the like can be used for the telephone bill for the mobile public telephone 54. First, the charging operation when charging pulse transmission is required will be described with reference to FIG. The GC 56 sends a response signal to the base station 55 in response to a response from the receiving terminal (step S61) (step S62), and after elapse of a predetermined period (no coin timing: 2.5 seconds, for example) Counting is performed for the response from the receiving terminal (step S61) (step S66). This is indicated by a black circle in FIG. In addition, when a predetermined time has elapsed and the charging pulse transmission trigger is triggered (step S67) as indicated by a double circle in FIG. 11A, the GC 56 transmits the charging pulse to the base station 55 (step S67). S68) After the elapse of the no coin timing, a count (sending charging pulse counting) is performed on the charging pulse transmission trigger pulse in step S67 (step S72). In S66 and S72, the GC 56 performs counting, but does not update the frequency meter itself.

  As shown in FIG. 11A, the base station 55 sends a no coin check (response storing signal) to the mobile public telephone 54 in response to the response signal (step S62) from the GC 56 (step S63). In response to the charging pulse (step S68), a no coin check (coin storage signal) for charging is sent to the mobile public telephone 54 (step S69). In addition, when not distinguishing especially a response storage signal, a coin storage signal, etc., it is only called a no coin check. The signal for storing coins in the mobile public telephone 54 (coin storage signal) also means a signal for storing electronic money such as a prepaid card.

  As shown in FIG. 11A, the mobile public telephone 54 stores coins for a fee when a period comes, and returns a response (no coin check result) to the no coin check from the base station 55 ( Steps S64 and S70). Each time the base station 55 receives a response (no coin check result) from the mobile public telephone 54, it updates and manages the value of the frequency meter held in the base station 55 (steps S65, S71: frequency meter addition) ).

  Here, as shown in FIG. 11B, the base station 55 sends a no coin check triggered by the charging pulse from the GC 56 (step S68) (step S69), and then within a short time (for example, Assume that no coin check result is received within 2 seconds). In this case, the base station 55 recognizes that the call has been disconnected, and sends a disconnect signal to the GC 56 (step S81). In FIG. 11B, the same processing steps as those in FIG. 11A are denoted by the same reference numerals, and detailed description thereof is omitted. Subsequently, the GC 56 that has received the disconnection signal performs processing for disconnecting the receiving terminal (step S82). In such a call disconnection, the GC 56 receives a disconnect signal before the no coin timing elapses from the charging pulse transmission trigger (step S67), and therefore does not count the charging pulse of the step S67 transmitted immediately before (step S67). Step S83). This is indicated by white circles in FIG.

  Although not shown in FIG. 11B, after the disconnection process (after step S83), the GC 56 sets the call frequency (once for response) to the frequency meter managed for each mobile public telephone facing line. + Send pulse count value). Thus, the frequency meter count timing of the base station 55 is different from the timing count of the GC 56 frequency meter, so the frequencies may not match. Therefore, using the frequency meter held in the base station 55 and the call frequency of the GC 56, settlement is performed between the communication carrier that manages the GC 56 and the base station carrier that manages the base station 55. In the GC 56, the value of the frequency meter stored for each mobile public telephone facing line (for each base station) can be acquired by a maintenance command for the GC 56.

  Next, a case where the base station can perform autonomous charging and does not need to transmit charging pulses will be described with reference to FIG. In FIG. 11C, the same processing steps as those in FIG. 11A are denoted by the same reference numerals, and detailed description thereof is omitted. The base station 55 capable of performing autonomous charging has a function capable of executing charging rate extraction processing (see step S55 in FIG. 10) performed by the GC 56 and the various data tables described above. Then, the base station 55 notifies the mobile public telephone 54 of the billing rate before the call is established (before step S61).

  As indicated by a double circle in FIG. 11C, the GC 56 does not transmit a charging pulse at a charging pulse transmission trigger (step S67). Then, after the time of the no coin timing elapses from the charging pulse transmission trigger (step S67), a count (charging pulse counting) is performed for the charging pulse transmission trigger pulse (not transmitted) in step S67 (step S72). .

  The base station 55 is triggered by the response signal from the GC 56 (step S62) to send a no-coin check for billing (referred to as a periodic storage signal) to the mobile public telephone 54 based on the billing rate cycle. (Autonomous charging operation) is performed (step S91). The operation after the call disconnection when charging pulse transmission is not required is the same as that when charging pulse transmission is required, and thus the description thereof is omitted.

A method for realizing the call connection processing and billing processing described with reference to FIGS. 10 and 11 in the IP network has not been known. In the IP network, the session control server and the application server (AS) share the call control function of the exchange, and the SIP protocol (Session Initiation Protocol) currently used distinguishes it as a mobile public telephone. There is no method, and there is a problem that the mobile public telephone service cannot be realized on the IP network.
Furthermore, until the communication network is fully IP, the IP network and the PSTN network will coexist for the time being, so if mobile public telephone service can be provided over the IP network, it will be received by the PSTN network subscriber. However, there is no method for this.

  Therefore, an object of the present invention is to provide a communication system, a communication method, and an application server that can solve the above-described problems and can realize a mobile public telephone service over an IP network.

  In order to solve the above problems, a communication system according to the present invention stores information on subscribers who subscribe to a service using an IP telephone on an IP network, and connects to the subscriber telephone used by the subscriber. A call from a mobile public telephone indicating a public telephone installed in a mobile server via a base station is transmitted at the connection destination of the mobile public telephone through the IP network based on the connection destination telephone number. An application server that sends the subscriber server that accommodates the subscriber telephone as a destination, and a call control signal and a voice signal that are used in the PSTN from the subscriber telephone are signals used on the IP network. A control signal used on the IP network as a signal for controlling a call received from the mobile public telephone side on the IP network. The incoming call-only function to send, the IP conversion function of the caller side that converts the analog voice signal from the mobile public telephone side into an IP packet, and the control signal sent by the incoming call-only function is received directly or indirectly, A first server function for adding a mobile public parameter indicating a call from the mobile public telephone as a header or a parameter to the received signal, and storing charge area information of the base station; A second server function for directly or indirectly receiving the control signal sent by a dedicated function, and adding the charge area information of the base station via the call as a header or a parameter to the received signal; It is characterized by providing.

  The communication system with such a configuration is used on the IP network to control incoming calls from mobile public telephones as a function for converting signals used in the PSTN and signals used on the IP network. Used on the IP network is a dedicated incoming call function that sends out control signals, an IP conversion function on the caller side that converts analog voice signals into IP packets, and signals used in the PSTN from subscriber phones And an IP conversion device for converting the signal. In addition, since the signal transmitted from the mobile public telephone is converted into a signal used on the IP network and the parameters for the mobile public are added, the mobile public telephone call and It is possible to distinguish from other normal calls. In addition to the parameters for the mobile public, the charge area information of the base station that has been passed through is also added, so that the billing process according to the distance can be easily performed in the mobile public telephone service of the IP network. In addition, these additional parameters for the mobile public and the charge zone information of the base station via the mapping data that can be easily associated with the call control signal in the PSTN network so far, can be transferred from the mobile public telephone via the IP network. Thus, it is possible to easily receive a call to a subscriber terminal of the PTSN network.

  In the communication system according to the present invention, the application server generates billing information based on the first server function, the second server function, the connection destination telephone number, and table data created in advance. A charging information generation function, a call frequency management function for updating the call frequency based on the generated charging information, and charging pulse transmission necessity data for each base station or each base station operator are accumulated, A charging pulse transmission function for transmitting a control signal indicating a charging pulse instruction after a call is established only when the call is established, and the incoming call exclusive function is between the subscriber station and the base station facing the base station. And is connected to the application server via the subscriber server that is opposite to the base station so as to be able to communicate with the application server. An analog control signal for charging is transmitted to the base station based on a control signal indicating the charging pulse instruction via the entry server, and the base station moves the coin storage signal for charging to the mobile station. It is preferable to perform an operation of sending to a public telephone.

  In the communication system configured as described above, the application server for performing call control processing, billing processing, and the like is communicably connected to a subscriber server facing the base station. When the opposite subscriber server accommodates the subscriber telephone, the incoming call can be received without relaying.

  In the communication system according to the present invention, the application server generates billing information based on the first server function, the second server function, the connection destination telephone number, and table data created in advance. A charging information generation function, a call frequency management function for updating the call frequency based on the generated charging information, and charging pulse transmission necessity data for each base station or each base station operator are accumulated, A charging pulse sending function for sending a control signal indicating a charging pulse instruction only when the incoming call dedicated function is provided between the base station and the application server facing the base station, A control signal that is communicably connected to the application server facing the base station and that indicates the charging pulse instruction from the application server. Based on the sent analog control signals for the charge for the base station, said base station, it is preferable to perform an operation for sending a coin storage signal for charging to the mobile public telephone.

  In the communication system having such a configuration, the application server that performs call control processing, billing processing, and the like is opposite to the base station. Therefore, the application server can directly send a billing pulse sending instruction to the incoming call dedicated function. Compared with the case where a subscriber server or the like is interposed, the exchange of signals between devices can be reduced.

  In the communication system according to the present invention, it is preferable that the incoming call exclusive function is built in or externally attached to the IP conversion function.

  Since the communication system having such a configuration can be stored compactly compared to the case where the dedicated incoming call function and the IP conversion function are arranged in different places as a single unit device, the arrangement space, the arrangement cost, etc. are reduced. It becomes easy to manage.

  In the communication system according to the present invention, the application server generates billing information based on the first server function, the second server function, the connection destination telephone number, and table data created in advance. A billing information generation function; and a call frequency management function for updating a call frequency based on the generated billing information, wherein the base station is provided on the IP network, the incoming call dedicated function, The transmission side IP conversion function and the billing information generation function are connected to the application server via the subscriber server that is opposite to the base station so as to be communicable. An off-hook response signal of the subscriber telephone is received via the subscriber server opposite to the base station, and the off-hook response signal is used as a trigger to charge Therefore, it is preferable to perform an operation of sending a periodic storage signal periodically sent to the mobile public telephone.

  In the communication system having such a configuration, since the base station is converted to the IP, an individual analog line between the base station and the subscriber server becomes unnecessary. Further, since the base station can perform autonomous charging, it is not necessary for another device such as an application server to perform complicated processing such as determining whether or not to transmit a charging pulse.

  In order to solve the above problems, a communication method according to the present invention stores information on a subscriber who subscribes to a service that uses an IP telephone on an IP network, and stores the information in a subscriber telephone used by the subscriber. The subscriber server to be connected and the charge area information of the base station are accumulated, and the call from the mobile public telephone indicating the public telephone installed in the mobile unit via the base station is based on the connected telephone number. An application server for sending to the subscriber server that accommodates the subscriber telephone to which the mobile public telephone is connected via the IP network, a call control signal used in the PSTN from the subscriber telephone, and An IP converter for converting a voice signal into a signal used on the IP network, and a control signal used on the IP network as a signal for controlling an incoming call from the mobile public telephone side A communication method in a communication system comprising: an incoming call dedicated function that converts an analog voice signal from the mobile public telephone side into an IP packet, wherein the application server is dedicated to the incoming call A control signal receiving step for directly or indirectly receiving the control signal transmitted by the function, a mobile public parameter indicating that the call is originated from the mobile public telephone, and the base station via the call An information adding step of adding toll area information as a header or a parameter to the received signal is executed.

  In the communication method of such a procedure, the incoming call exclusive function of the communication system sends a control signal used on the IP network as a signal for controlling a call incoming from the mobile public telephone side, and this control signal is directly or indirectly transmitted. Since the receiving application server adds the mobile public parameter, it is possible to distinguish between the mobile public telephone call and other normal calls in the IP network. In addition, since the application server adds to the received control signal the toll area information of the base station that has passed through, the charging process according to the distance can be easily performed even in the mobile public telephone service of the IP network.

  In the communication method according to the present invention, the subscriber server facing the base station receives the control signal sent from the incoming call dedicated function, and receives the control signal from the incoming call exclusive function. And determining that the call is an outgoing call from the mobile public telephone, and transferring the received control signal to the application server. The application server is configured for each base station or base station. The charging pulse transmission necessity data for each business operator is accumulated, and the control signal received by the dedicated call reception function and transmitted via the subscriber server facing the base station is received. Only when the call from the mobile public telephone shown in FIG. 5 needs to send a charge pulse, a step of sending a control signal indicating a charge pulse instruction is executed after the call is established. When the incoming call dedicated function directly or indirectly receives the control signal indicating the charging pulse instruction from the application server, it transmits a charging pulse indicating the analog control signal for charging to the base station. Preferably, when the base station receives the charging pulse, the base station executes a step of sending a coin storage signal for charging to the mobile public telephone.

  In the communication method of this procedure, a subscriber server that is opposite to a base station in the communication system receives a control signal sent from the incoming call dedicated function, and determines that the call is an outgoing call from a mobile public telephone. be able to. Then, the subscriber server can transfer the control signal to the application server corresponding to the mobile public telephone service. Then, based on the received control signal, the application server sends a billing pulse instruction after the call is established only when the base station through which the call from the mobile public telephone has passed requires billing pulse transmission. Then, the incoming call only function sends a charging pulse to the base station when receiving the charging pulse instruction, and the base station sends a coin storage signal to the mobile public telephone in response to this. Therefore, even in a mobile public telephone service of an IP network, charging processing can be executed by sending a charging pulse using an analog line to a base station.

  Further, in the communication method according to the present invention, the application server stores charging pulse transmission necessity data for each base station or each base station operator, and directly receives the control signal from the incoming call dedicated function. Thus, it is determined that the call is a call from the mobile public telephone, and based on the received control signal, only when the call from the mobile public telephone needs to send a charging pulse, Executing a step of sending a control signal indicating a charging pulse instruction, wherein the incoming call-only function receives a control signal indicating the charging pulse instruction from the application server; and receiving a control signal indicating the charging pulse instruction And triggering a charging pulse indicating an analog control signal for charging to the base station. And receiving the charging pulse, it is preferable to perform the step of transmitting a coin storage signal for charging to the mobile public telephone, a.

  In the communication method of this procedure, the application server that is opposite to the base station in the communication system directly receives the control signal transmitted from the incoming call dedicated function, and determines that the call is an outgoing call from the mobile public telephone. be able to. Then, based on the received control signal, the application server sends a billing pulse instruction after the call is established only when the base station through which the call from the mobile public telephone has passed requires billing pulse transmission. Therefore, in the mobile public telephone service of the IP network, the charging process can be executed by sending the charging pulse using the analog line to the base station, and compared with the case where the subscriber server is interposed Thus, the exchange of signals between devices can be reduced.

  In the communication method according to the present invention, the base station is provided on the IP network and has the incoming call dedicated function, and the subscriber server facing the base station transmits the base station. Receiving a control signal used on the IP network as a signal for controlling a call incoming from the mobile public telephone side; and receiving the control signal from the base station, Determining that the call is from the mobile public telephone, and transferring the received control signal to the application server. The application server sends the base station to face the base station. The subscriber receives the control signal via the subscriber server, and the base station passes from the application server via the subscriber server facing the base station. It is preferable to execute a step of receiving an off-hook response signal of a telephone and a step of transmitting a periodic storage signal periodically transmitted for charging to the mobile public telephone in response to the received response signal. .

  In the communication method of such a procedure, a subscriber server that is opposite to a base station in the communication system directly receives a control signal transmitted from an IP base station having an incoming call exclusive function, so that the call moves. It can be determined that the call originates from a public telephone. The subscriber server can transfer the control signal to an application server corresponding to the mobile public telephone service. Then, the application server sends a control signal to the subscriber server that accommodates the subscriber telephone that is the connection destination of the mobile public telephone via the IP network. After the call is established, the base station sends a periodic storage signal to the mobile public telephone in response to an off-hook response signal from the subscriber telephone. Therefore, by making all base stations autonomously charge, an individual analog line between the base station and the subscriber server becomes unnecessary, and other devices such as an application server need / not need to send charging pulses. It is not necessary to perform complicated processing such as determination.

  In order to solve the above problem, an application server according to the present invention stores information on subscribers who subscribe to a service that uses an IP telephone on an IP network, and stores the information in a subscriber telephone used by the subscriber. Connection of the mobile public telephone via the IP network based on the telephone number of the connection destination subscriber server and the call from the mobile public telephone indicating the public telephone mounted on the mobile unit via the base station An application server that sends out the subscriber server that accommodates the subscriber telephone that is the destination, and a call control signal and a voice signal used in the PSTN from the subscriber telephone are used on the IP network. An IP conversion device for converting the signal into a signal to be received and a control signal used on the IP network as a signal for controlling a call received from the mobile public telephone side. An application server in a communication system comprising: an incoming call dedicated function for sending a message to a destination; and an IP conversion function on a caller side for converting an analog voice signal from the mobile public telephone side to an IP packet. A first parameter that directly or indirectly receives the control signal sent by a dedicated function and adds a mobile public parameter indicating that the call is originated from the mobile public telephone as a header or a parameter to the received signal. The server function, the charge area information of the base station is accumulated, the control signal sent by the incoming call dedicated function is received directly or indirectly, and the charge area information of the base station via the call is The second server function to be added as a header or parameter to the received signal, the connection destination telephone number and pre-created table data Billing information generation function for generating charging information based on the call information, a call frequency management function for updating the call frequency based on the generated charging information, and charging pulse transmission necessity data for each base station or each base station operator And a charging pulse transmission function for transmitting a control signal indicating a charging pulse instruction after establishment of a call only when transmission is necessary.

The application server having such a configuration adds a mobile public parameter to a control signal in which a signal transmitted from a mobile public telephone is converted into a signal used on the IP network by an incoming call exclusive function. Thus, it is possible to distinguish a mobile public telephone call from other normal calls. In addition, since the application server adds the charge area information of the base station through which the call passes to the control signal for controlling the call of the mobile public telephone, the mobile public telephone service of the IP network also responds to the distance. Billing processing can be performed easily.
In addition, the application server updates the call frequency based on the billing information generated for the call of the mobile public telephone and sends a billing pulse instruction after the call is established only when the base station through which the call passes is required to send. To do. Therefore, even in a mobile public telephone service of an IP network, charging processing can be executed by sending a charging pulse using an analog line to a base station.

  Since the communication system of the present invention has the same function as the means for realizing the mobile public service in the conventional PSTN network on the IP network side, the mobile public telephone service can be realized on the IP network. In addition, when providing this new service, it is not necessary to modify the existing PSTN device, and the new service can be provided to subscribers accommodated in the IP network.

It is a block diagram which shows typically an example of the whole structure of the communication system which concerns on embodiment of this invention. It is a lineblock diagram showing typically the communications system concerning a 1st embodiment of the present invention. It is a sequence diagram which shows typically the flow of a process of the communication system which concerns on 1st Embodiment of this invention. It is a block diagram which shows typically the communication system which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows typically the flow of a process of the communication system which concerns on 2nd Embodiment of this invention. It is a block diagram which shows typically the communication system which concerns on 3rd Embodiment of this invention. It is a sequence diagram which shows typically the flow of a process of the communication system which concerns on 3rd Embodiment of this invention. It is a block diagram which shows typically the communication system which concerns on 4th Embodiment of this invention. It is a sequence diagram which shows typically the flow of a process of the communication system which concerns on 4th Embodiment of this invention. It is a block diagram which shows typically the flow of the mobile public telephone service in the conventional PSTN network. FIG. 7 is a sequence diagram showing a flow of billing processing in a conventional mobile public telephone service, where (a) is processing when charging pulses need to be sent, (b) is billing pulse counting processing in disconnection processing, and (c) is The processing in the case where charging pulse transmission is unnecessary is shown.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings.

[Outline of communication system]
A communication system 1 shown in FIG. 1 implements a mobile public telephone service.
As shown in FIG. 1, an antenna 53 is laid along a track 52 on which a train 51 travels. A mobile public telephone 54 is mounted in the train 51, and is connected to the base station 2 disposed in a train monitoring center or the like via an antenna 53, for example. The mobile public telephone 54 indicates a public telephone installed on the mobile body. In this example, the mobile body (mobile station) is, for example, the train 51, but the mobile body may be a ship or the like.

  The communication system 1 includes a plurality of devices such as servers in an IP network 3. In this example, the communication system 1 includes a plurality of devices in the PSTN network 4, and the IP network 3 signal and the ISUP (ISDN user part) signal are intermediate between the IP network 3 and the PSTN network 4. PSTN-GW5 that performs conversion with In FIG. 1, “IGS / IC / GC” indicated by reference numeral 14 in the PSTN network 4 is an IGS (gateway switch), IC (relay switch), GC (subscriber switch), etc. A general term for devices to be connected to the subscriber telephone 13 is shown.

The case where SIP is applied to the IP network protocol will be described below.
Here, the communication system 1 includes a subscriber server 6 (6a, 6b), an AS (application server) 7, a relay server 8, an IP converter 9 (9a, 9b), an IP network 3 on an IP network 3. -It was decided to have the ICT device 10. In FIG. 1, the number of devices and wiring connections are merely examples, and are not limited thereto. For example, the number of relay servers 8 or the like may be increased, or the subscriber server 6b and the relay server 8 may be connected by wiring.

  The subscriber server 6 accumulates information on customers (subscribers) who subscribe to a service that uses an IP telephone on the IP network 3 and connects to a subscriber telephone 11 used by the subscriber. The subscriber server 6 is a server that performs control for connection to the subscriber telephone 11 and corresponds to a GC in the PSTN network 4.

  The subscriber server 6a is connected to the subscriber telephone 11 via the IP conversion device 9a. The subscriber server 6 b is a subscriber server that is opposite to the base station 2, and is connected to the base station 2 via the IP conversion device 9 b and the IP-ICT device 10. In addition, when not distinguishing in particular, it describes with the subscriber server 6.

  The AS (application server) 7 sends a call from the mobile public telephone 54 via the base station 2 to the subscriber telephone 11 which is the connection destination of the mobile public telephone 54 via the IP network 3 based on the connection destination telephone number. Is sent to the subscriber server 6b that accommodates. The AS 7 is configured as, for example, a B2BUA (Back-to-Back User Agent). The AS 7 is a server that issues a connection instruction (number conversion or the like) corresponding to the logic for each service. The AS 7 connects a call from the mobile public telephone 54 (mobile public telephone call) to the subscriber telephone 11 via the IP network 3. For example, when the connection is restricted, the AS 7 sends a guidance instruction to the MS 12 (Media Server) that stores voice guidance data and the like. Details of the functions of AS7 will be described later.

  The relay server 8 is a server that performs transfer between the subscriber servers 6 and the like. This relay server 8 corresponds to an IC in the PSTN network 4.

The IP converter 9a accommodates the line from the subscriber telephone 11 used on the PSTN, and uses the call control signal and voice signal used on the PSTN from the subscriber telephone 11 on the IP network 3. Is a device for converting into a signal to be transmitted.
The IP converter 9b (IP conversion function on the transmission side) converts an analog voice signal from the mobile public telephone 54 side into an IP packet. In addition, when it does not distinguish in particular, it describes with the IP converter 9.

  An IP-ICT (Information and Communication Technology) device 10 transmits a control signal used on the IP network 3 as a signal for controlling a call received from the mobile public telephone 54 side. The IP-ICT apparatus 10 corresponds to the incoming call exclusive function described in the claims. The IP-ICT apparatus 10 is communicably connected to the base station 2 via an analog individual line. The IP-ICT device 10 converts a signal using an IP / analog individual line. The IP-ICT apparatus 10 is disposed between, for example, the base station 2 and the opposite subscriber server 6b or AS7. Since the base station and the GC of the PSTN network are conventionally connected by analog individual lines, they are arranged so as to correspond to the conventional equipment. Here, the analog voice signal from the base station 2 passes through without being processed by the IP-ICT apparatus 10, and is converted into an IP packet by the IP converter 9b. The analog call control signal from the base station 2 is converted into a SIP signal by the IP-ICT device 10 and passes through without being processed by the IP conversion device 9b.

[Functions deployed in the communication system]
The communication system 1 is mainly provided with the following functions (1) to (8) in order to realize a mobile public telephone service.

(1) Opposing base station:
A device that converts the signal of the IP-to-analog individual line is available. In this function, for example, the IP-ICT device 10 detects a call request from an analog individual line, converts the signal of the analog individual line into an IP signal, for example, a SIP-INVITE signal (hereinafter simply referred to as INVITE). ). In addition, it can respond also by making a base station into IP like 4th Embodiment mentioned later, and a base station playing the role of the IP-ICT apparatus 10 (call reception exclusive function). In this case, the (1) base station facing function refers to a function realized by a configuration in which an IP connection is accommodated by a server on the IP network facing the base station.

(2) Dial analysis:
This function is a function for analyzing a received dial number and performing a connection permission judgment on a server on the IP network 3. For example, the AS 7 analyzes the reception dial number and performs connection permission determination. Specifically, if the telephone number dialed by the mobile public telephone 54 indicates a network that can be connected for communication, it is determined that the connection is permitted, while if it indicates a network that cannot be connected for communication, It is determined that connection is not permitted (connection is restricted). This function corresponds to a GC function in the PSTN network 4.

(3) Guidance connection:
This function is a function for sending a guidance instruction “INFO” at the server on the IP network 3 when connection is restricted. For example, the AS 7 sends a guidance instruction “INFO” when connection is restricted. Since normal SIP does not have a parameter for such use, SIP extension is necessary, so the extension parameter is added as a header or parameter of the SIP signal. The guidance at the time of connection restriction indicates a voice guidance such as “cannot be connected to the telephone number that has been dialed”, and the server on the IP network 3 sends a control signal “INFO” indicating a guidance instruction command to the MS 12. "Is sent out.

(4) ISUP mapping:
This function is a function of adding a parameter for identifying a mobile public to a SIP signal by a server on the IP network 3. Since normal SIP does not have a parameter for such use, SIP extension is necessary, so the extension parameter is added as a header or parameter of the SIP signal. For example, AS7 sets a parameter indicating a train public call to INVITE. This function corresponds to the first server function described in the claims. For example, the AS 7 directly or indirectly receives a control signal sent from the IP-ICT apparatus 10 (incoming call dedicated function), and sets a mobile public parameter indicating that the call is from the mobile public telephone 54 as a received signal. As a header or parameter. Details will be described later.
In addition, when connecting from the IP network 3 to the PSTN network 4, a server located in the middle, for example, the PSTN-GW 5 is connected to the ISUP (IAM) by calling user type: public (street), fixed additional user type 1: mobile public. Set.

(5) Charge area information setting:
This function is a function for extracting the area information (CA information) to which the IP-ICT apparatus 10 that has made the call request belongs to a server on the IP network 3 and adding it to the SIP signal. Since normal SIP does not have a parameter for such use, SIP extension is necessary, so the extension parameter is added as a header or parameter of the SIP signal. For example, the AS 7 extracts the CA information to which the IP-ICT apparatus 10 that has made the call request belongs, and sets it to INVITE. This function corresponds to the second server function described in the claims. For example, the AS 7 accumulates the charge area information of the base station 2 and directly or indirectly receives the control signal transmitted by the IP-ICT device 10 (incoming call dedicated function), and charges the base station 2 via the outgoing call. Zone information is added as a header or parameter to the received signal. Details will be described later.

(6) Billing index extraction:
This function is a function of a server on the IP network 3 that holds the equivalent of PSTN charge revision data and determines the number of charged call seconds from the base station connection point and the called number (connection destination number). For example, the AS 7 holds the PSTN fee revision data equivalent and determines the number of charged call seconds from the base station connection point and the called number. This function corresponds to the billing information generation function described in the claims. For example, the AS 7 generates billing information based on the connection destination telephone number and pre-created table data.

(7) Call frequency management (billing frequency management):
This function is a function of a server on the IP network 3 that manages the number of calls and outputs the value to a file or the like for settlement with a base station operator. For example, the AS 7 manages the call frequency for settlement with the base station operator and outputs the value to a file or the like. This function corresponds to the call frequency management function described in the claims. For example, the AS 7 updates the call frequency based on the generated billing information.

(8) Charge pulse transmission:
This function is a function in which a server on the IP network 3 performs data management on the necessity of sending a charging pulse for each base station or base station operator, and sends a charging pulse only when transmission is necessary. For example, the AS 7 manages data on whether or not charging pulses are transmitted for each base station or each base station operator, and transmits charging pulses only when transmission is necessary. This function corresponds to the charging pulse transmission function described in the claims. For example, the AS 7 accumulates charging pulse transmission necessity data, and sends a control signal indicating a charging pulse instruction to the IP-ICT apparatus 10 (incoming call only function) after establishing a call only when transmission is necessary. Note that this function is unnecessary when all base stations can be charged autonomously by converting the base station to IP as in the fourth embodiment described later.

  In the example shown in FIG. 1, the functions (2) to (8) are deployed in the AS 7, but can be deployed in other servers (subscriber server 6 and relay server 8) in the IP network 3. It is.

[IP system of communication system]
Hereinafter, as an IP system of the communication system 1, the first to fourth embodiments will be described according to the IP-ICT apparatus deployment method.

(First embodiment)
In the first embodiment, as shown in FIG. 2, the IP-ICT device 10A on the base station 2 side is arranged in the IP conversion device 9A.
In FIG. 2, a thick solid line arrow 21 indicates a flow of call connection processing. This call connection processing 21 is performed by "mobile public telephone 54-> base station 2-> IP-ICT device 10 A-> subscriber server 6 b-> AS 7-> subscriber server 6 b-> relay server 8-> subscriber server 6 a-> IP conversion device 9 a-> subscription. The telephones are connected in this order. Note that the control signal for the call connection process only passes through the IP conversion device 9A when passing through the IP-ICT device 10A.

  In FIG. 2, a thick dashed arrow indicated by reference numeral 22 indicates a voice flow. The voice (voice signal) 22 is connected in the order of “mobile public telephone 54 → base station 2 → IP conversion apparatus 9A → IP conversion apparatus 9a → subscriber telephone 11”. The analog audio signal only passes through the IP-ICT device 10A when passing through the IP conversion device 9A. Further, the IP conversion device 9A and the IP conversion device 9a are connected by, for example, an optical fiber although not shown.

  In the first embodiment, the AS 7 determines whether to send a charging pulse in accordance with whether or not the base station 2 has autonomous charging. The AS 7 performs processing for creating a charging cycle, processing for sending a charging pulse, processing for adding a call frequency meter, and the like.

  In FIG. 2, a thick arrow indicated by reference numeral 23 indicates a charging pulse instruction (SIP control signal). This charging pulse instruction 23 is connected in the order of “AS7 → subscriber server 6b → IP-ICT apparatus 10A”. In FIG. 2, a white arrow indicated by reference numeral 24 indicates a charging pulse (analog line MF signal). The charging pulse 24 is transmitted from the IP-ICT apparatus 10A to the base station 2.

Next, an IP origination / IP arrival sequence (hereinafter referred to as a basic sequence) for providing a mobile public telephone service in an IP network will be described with reference to FIG.
First, a call is made from the mobile public telephone 54 (step S1). That is, the mobile public telephone 54 sends a transmission signal to the base station 2. Then, a dial tone (DT) is transmitted from the base station 2 to the mobile public telephone 54. In the mobile public telephone 54 that has received the DT, a telephone number (for example, 0A to J) of a connection destination (partner) is input by a user in the mobile station (train 51).

  The base station 2 receives the numbers of the incoming telephone numbers (0A to J) and connects to the opposite subscriber server 6b via the IP-ICT device 10A (step S2). At this time, the base station 2 sends an activation signal to the IP-ICT apparatus 10A. Then, the IP-ICT device 10A detects the call request from the analog individual line, receives the number of the incoming telephone number as an analog individual line signal (MF signal), and receives the SIP connection instruction signal INVITE (A ~ J) to the subscriber server 6b.

  Since the subscriber server 6b is connected from the IP-ICT device 10A, it determines that it is “mobile public transmission”, connects to AS7, and AS7 receives INVITE (A to J) (steps). S3: Control signal reception step).

  The AS (B2BUA) 7 adds a SIP extended parameter indicating that it is a mobile public telephone to the INVITE and sends it to the subscriber server 6b to instruct a connection to the connection destination (subscriber telephone 11) (step) S4: Information adding step). Specifically, in the extension parameter added to INVITE, payphone 'is set in the cpc parameter of the From header. Similarly, information corresponding to the “mobile public” of the conventional ISUP additional user type is added to INVITE as a new header or a new parameter. Furthermore, the “base station CA information” corresponding to the conventional ISUP provider information transfer parameter-charge zone information is added to the INVITE as a new header or a new parameter.

  The subscriber server 6b performs connection processing to the connection destination subscriber (subscriber telephone 11) and connects to the subscriber server 6a accommodated in the connection destination subscriber telephone 11 (step S5). At this time, the relay server 8 may be used. When the subscriber server 6a makes a call (IR) to the subscriber telephone 11, it reverses the connection path and sends a call command (RBT: ringback tone) to the mobile public telephone 54 (step S6). ). Specifically, the IP conversion device 9a on the subscriber telephone 11 side returns 180 (180 Ringing) indicating that a call (IR) is being made to the IP-ICT device 10A, and the IP-ICT device 10A It is converted into a command (RBT) and sent to the mobile public telephone 54.

  When the connection destination (destination) subscriber raises the hook of the subscriber telephone 11 and responds (off hook), the IP conversion device 9a on the subscriber telephone 11 side sends 200 (SDP) indicating that to the connection telephone The route is reversed and sent to the IP-ICT device 10A (step S7). At this time, the IP-ICT device 10A converts 200 (SDP) into a response signal that is an MF signal of an analog individual line, and transmits the response signal to the base station 2. Then, the base station 2 sends a response storing signal (no coin check) to the mobile public telephone 54 (step S8), and the mobile public telephone 54 returns a response (no coin check result) (step S9). As a result, a call between the subscriber telephone 11 and the mobile public telephone 54 is started. Note that 200 (SDP) means 200 OK and a parameter value of SDP (Session Description Protocol) set.

  The AS (B2BUA) 7 manages whether or not the charging pulse is required for each base station or each base station operator. When a call is started, a command for instructing charging pulse transmission is required when transmission is required. Is transmitted to the IP-ICT apparatus 10A via the subscriber server 6b (step S10).

  Then, the IP-ICT device 10A converts the INFO signal (billing pulse instruction 23: see FIG. 2) into a billing pulse 24 that is an MF signal and sends it to the base station 2 (step S11). Then, the base station 2 sends a no coin check (coin storage signal) for charging to the mobile public telephone 54 in response to the charging pulse from the IP-ICT apparatus 10A (step S11) (step S12).

  In addition, in S12 of FIG. 3, the periodic storage signal was illustrated instead of the coin storage signal as an example of the no coin check. This corresponds to the case where transmission is not required in step S10, that is, the case where the base station 2 can autonomously charge. In this case, the AS 7 does not send the INFO signal (billing pulse instruction 23), and as a result, no billing pulse is sent to the base station that can perform autonomous billing. Then, the base station 2 capable of autonomous billing uses a response signal (step S7) from the IP-ICT device 10A as a trigger to send a no-coin check (cycle storage signal) for billing based on the billing rate cycle. An operation (autonomous charging operation) sent to the telephone 54 is performed.

  The mobile public telephone 54 stores coins for a fee when a period comes, and returns a response (no coin check result) to the no coin check (coin storage signal or periodic storage signal) from the base station 2 (step) S13).

  When the call is finished, the mobile public telephone 54 sends a disconnection signal to the IP-ICT apparatus 10A via the base station 2 (step S14). Specifically, when the base station 2 receives a no coin check result within a short time (for example, within 2 seconds), the base station 2 recognizes that the call has been disconnected and sends a disconnection signal to the IP-ICT apparatus 10A. . Then, the IP-ICT device 10A converts the disconnection signal, which is an MF signal, into a SIP BYE (SIP call end instruction signal), and transmits it to the counterpart IP conversion device 9a (step S15). Is sent to the base station 2 (step S16). Note that the call frequency at this time is managed by the AS (B2BUA) 7, and the value of the call frequency is output to a file or the like, so that the settlement with the base station operator can be performed.

  In the case of communication from an IP terminal to a PSTN terminal, in step S5 of the basic sequence, the AS 7 or the relay server 8 transfers INVITE to the PSTN-GW 5 (see FIG. 1). The PSTN-GW 5 maps the information added by the SIP extension described in (4) ISUP mapping function to the PSTN signal (IAM). That is, the PSTN-GW 5 sets the calling user type: public (street) and fixed additional user type 1: mobile public in ISUP (IAM) and connects to the “IGS / IC / GC” 14. As a result, the incoming call can be made to the subscriber telephone 13.

  In the first embodiment, the IP-ICT device 10A does not necessarily need to be built in the IP conversion device 9A, and may be provided externally to the IP conversion device 9A. In the call connection processing, there is no difference depending on the way of deployment, so here, both internal and external are treated as the same.

(Second Embodiment)
In the second embodiment, as illustrated in FIG. 4, the IP-ICT device 10 on the base station 2 side and the IP conversion device 9 are arranged as separate devices. 4, the same reference numerals are given to the same configurations and the same processes as those shown in FIG. 2, and the description thereof will be omitted.

  In the second embodiment, call connection processing for the IP-ICT apparatus 10 is directly controlled from the AS 7B. That is, in FIG. 4, the call connection processing 21 is “mobile public telephone 54 → base station 2 → IP-ICT apparatus 10 → AS7B → relay server 8 → subscriber server 6a → IP conversion apparatus 9a → subscriber telephone 11”. Connected in order.

  In FIG. 4, the voice (voice signal) 22 is in the order of “mobile public telephone 54 → base station 2 → IP-ICT apparatus 10 (pass) → IP conversion apparatus 9b → IP conversion apparatus 9a → subscriber telephone 11”. Connected. In addition, although illustration is abbreviate | omitted between the IP converter 9b and the IP converter 9a, it connects with the optical fiber etc., for example.

In the second embodiment, as in the first embodiment, the AS 7B determines whether to send a charging pulse in accordance with whether or not the base station 2 has autonomous charging.
In FIG. 4, the charging pulse instruction 23 is connected in the order of “AS7B → IP-ICT device 10A”. The charging pulse 24 is transmitted from the IP-ICT apparatus 10 to the base station 2.

  Next, a description will be given, with reference to FIG. 5, of an IP origination / IP arrival sequence for providing a mobile public telephone service in the second embodiment. In FIG. 5, the same processes as those in the basic sequence shown in FIG.

  Step S1 is the same as the processing of the basic sequence in FIG. Subsequently, the base station 2 receives the numbers of the incoming telephone numbers (0A to J) and connects to the opposite AS 7B via the IP-ICT device 10 (step S2). At this time, the base station 2 sends an activation signal to the IP-ICT apparatus 10. The IP-ICT device 10 detects a call request from the analog individual line, receives the number of the incoming telephone number as an analog individual line signal (MF signal), and receives the SIP connection instruction signal INVITE (A ~ J) to AS7B. The AS 7B receives INVITE (A to J) (step S2: control signal reception step). As a result, since the AS 7B is connected from the IP-ICT apparatus 10, it determines that it is “mobile public transmission”. Step S2 in FIG. 5 is a combination of steps S2 and S3 in FIG.

  Step S4 in FIG. 5 is a combination of steps S4 and S5 in FIG. In this example, the AS 7B adds a SIP extended parameter indicating that it is a mobile public telephone to INVITE (SIP connection instruction signal), and connects to the connection destination (subscriber telephone 11) with respect to the relay server 8. Instruct. Then, the relay server 8 performs connection processing to the subscriber telephone 11. That is, the relay server 8 connects to the subscriber server 6a in which the subscriber telephone 11 is accommodated. Steps S6 to S16 are the same as the basic sequence process of FIG. 3 described above except that the process of the subscriber server 6b is omitted. Further, the processing in the case of connection between the IP terminal and the PSTN terminal is the same as that in the first embodiment, and thus the description thereof is omitted.

(Third embodiment)
In the third embodiment, as shown in FIG. 6, the IP-ICT device 10 on the base station 2 side and the IP conversion device 9 are provided as separate devices, and call connection processing for the IP-ICT device 10 is performed as AS7. And the subscriber server 6b, and the AS 7 determines whether to send a charging pulse in accordance with whether or not the base station 2 has autonomous charging. In FIG. 6, the configuration is the same as that shown in FIG. 2 except that the IP-ICT device 10 and the IP conversion device 9 are separate devices, and detailed description thereof is omitted.

  In FIG. 6, the call connection processing 21 is connected in the substantially same order as the order shown in FIG. In FIG. 6, the voice (voice signal) 22 is connected in the order of “mobile public telephone 54 → base station 2 → IP-ICT apparatus 10 (pass) → IP conversion apparatus 9b → IP conversion apparatus 9a → subscriber telephone 11”. The In addition, although illustration is abbreviate | omitted between the IP converter 9b and the IP converter 9a, it connects with the optical fiber etc., for example.

  Next, FIG. 7 shows an IP source-IP sequence for providing a mobile public telephone service in the third embodiment. 7 is the same as the basic sequence process shown in FIG. 3 except that the IP-ICT device 10 and the IP conversion device 9 are separate devices, and the description thereof is omitted. Further, the processing in the case of connection between the IP terminal and the PSTN terminal is the same as that in the first embodiment, and thus the description thereof is omitted.

(Fourth embodiment)
In the fourth embodiment, as shown in FIG. 8, the base station itself is converted to IP without placing a single IP-ICT device 10, and the IP-converted base station 2C and the subscriber server 6b are directly connected by an optical fiber or the like. IP connection was decided. In IP, since it is impossible to send an analog charging pulse signal that has been used in the PSTN network so far, it is assumed that the base station 2C performs all autonomous charging. In FIG. 8, the same reference numerals are given to the same configurations and the same processes as those shown in FIG.

In FIG. 8, the call connection processing 21 is connected in the order of “mobile public telephone 54 → base station 2C → subscriber server 6b → AS 7C → relay server 8 → subscriber server 6a → IP converter 9a → subscriber telephone 11”. The
In FIG. 8, the voice (speech signal) 22 is connected in the order of “mobile public telephone 54 → base station 2C →→ IP converter 9a → subscriber telephone 11”. Note that the base station 2C-IP conversion device 9a is connected to the base station 2C-IP conversion device 9a by, for example, an optical fiber although not shown.

  Next, an IP source-IP destination sequence for providing a mobile public telephone service in the fourth embodiment will be described with reference to FIG. In FIG. 9, the same processes as those in the basic sequence shown in FIG.

  Step S1 is the same as the processing of the basic sequence in FIG. Subsequently, the base station 2C receives the numbers of the incoming telephone numbers (0A to J) and connects to the opposite subscriber server 6b (step S2). At this time, the base station 2C sends out a SIP connection instruction signal INVITE (A to J) to the subscriber server 6b based on the number of the incoming telephone number.

  Since the subscriber server 6b is connected from the base station 2C, the subscriber server 6b determines that it is “mobile public transmission”, connects to AS7C, and AS7C receives INVITE (A to J) (step S3: Control signal receiving step). Note that steps S4 to S9 in FIG. 9 are the same as those described above, except that the process of the IP-ICT apparatus 10A is omitted.

  When the call is started, the base station 2C performs autonomous charging (step S21) without transmitting the charging pulse in the AS 7C. That is, since the charging pulse is not transmitted from the AS 7C, the processing of steps S10 to S11 of the basic sequence of FIG. 3 described above is not executed. Instead, the base station 2C autonomously sends a signal (period) to the mobile public telephone 54. A storage signal is transmitted (step S12). Note that steps S13 to S15 in FIG. 9 are the same as the basic sequence process in FIG. 3 described above, except that the process of the IP-ICT apparatus 10A is omitted. Further, since the base station 2C is IP, the subscriber server 6b does not need to transmit a restoration completion signal. Further, the processing in the case of connection between the IP terminal and the PSTN terminal is the same as that in the first embodiment, and thus the description thereof is omitted.

  According to the fourth embodiment, since the base station is made IP, there are advantages that the IP-ICT device 10 is not required and that analog individual lines can be eliminated.

  As described above, according to the communication system 1 according to the first to third embodiments of the present invention, since the functions (1) to (8) are provided, the mobile public service is realized on the IP network. can do. At this time, the mobile public service can be provided to subscribers accommodated in the IP network without any modification of the existing PSTN side device.

  If the AS 7 does not exist on the IP network 3 side, it is necessary to distribute the outgoing call from the mobile public telephone 54 on the IP network 3 side to the PSTN network 4 and perform connection processing on the PSTN network 4 side. However, according to the present invention, by placing the AS 7 in the IP network 3 and performing the billing process through the AS 7, no matter what the connection destination of the mobile public service is the IP network 3 or the PSTN network 4 on the PSTN side. Mobile public service can be provided without any modification.

In addition, since the server in the IP network 3 is provided with the (2) dial analysis function, it is possible to determine whether or not the connection is for another telecommunications carrier in the IP network 3.
In addition, since the charging pulse transmission function is provided in the server in the IP network 3, it is possible to provide the same service content as the conventional PSTN by providing support for both operations with and without charging pulse transmission.

  Also, according to the communication system 1 according to the fourth embodiment of the present invention, the functions (1) to (7) are similarly provided, so that a mobile public service can be realized over an IP network. .

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these, It can implement in the range which does not change the meaning. For example, the function deployed in AS 7 does not necessarily need to be deployed in AS 7, and can be deployed in another server (subscriber server 6 or relay server 8) in IP network 3.

  In each embodiment, the case of the SIP signal as the signal used in the IP network has been described. However, regardless of the SIP, all signals on the IP that can include information that needs to be transmitted in the signal are included. Applicable. That is, other signals in SIP and protocols other than SIP can be applied.

1 Communication system 2, 2C Base station 3 IP network 4 PSTN network 5 PSTN-GW
6 (6a, 6b) Subscriber server 7 AS (application server)
7B AS (Application Server)
7C AS (application server)
8 Relay server 9a (9) Subscriber side IP converter 9b (9, 9A) Base station side IP converter 10, 10A IP-ICT equipment 11, 13 Subscriber telephone 12 MS
14 IGS / IC / GC

Claims (10)

A subscriber server that stores information of subscribers who subscribe to a service that uses an IP telephone on an IP network, and that connects to a subscriber telephone that the subscriber uses;
The subscriber telephone that is a connection destination of the mobile public telephone via the IP network based on a connection telephone number based on a call destination from the mobile public telephone showing a public telephone mounted on the mobile body An application server that sends the subscriber server that accommodates
A communication system comprising: an IP converter for converting call control signals and voice signals used in the PSTN from the subscriber telephone to signals used on the IP network,
On the IP network,
An incoming call dedicated function for sending a control signal used on the IP network as a signal for controlling a call incoming from the mobile public telephone side;
An IP conversion function on the calling side that converts an analog voice signal from the mobile public telephone side into an IP packet;
The control signal sent by the incoming call-dedicated function is received directly or indirectly, and a mobile public parameter indicating that the call is originated from the mobile public telephone is added to the received signal as a header or a parameter. A first server function;
The base station charge area information is accumulated, the control signal sent by the incoming call dedicated function is received directly or indirectly, and the base station charge area information via the call is received with respect to the received signal. And a second server function added as a header or parameter. The application server is
The first server function;
The second server function;
A billing information generating function for generating billing information based on the destination telephone number and pre-created table data;
A call frequency management function for updating the call frequency based on the generated billing information;
Charging pulse transmission necessity data for each base station or base station operator, and charging pulse transmission function for sending a control signal indicating a charging pulse instruction after call establishment only when transmission is required,
The incoming call only function is
Provided between the base station and the subscriber server facing the base station, and connected to the application server via the subscriber server facing the base station, Based on a control signal indicating the charging pulse instruction from the application server via the subscriber server, an analog control signal for charging is sent to the base station,
The communication system according to claim 1, wherein the base station performs an operation of sending a coin storage signal for billing to the mobile public telephone. The application server is
The first server function;
The second server function;
A billing information generating function for generating billing information based on the destination telephone number and pre-created table data;
A call frequency management function for updating the call frequency based on the generated billing information;
A charge pulse transmission function for accumulating charge pulse transmission necessity data for each base station or each base station operator, and transmitting a control signal indicating a charge pulse instruction only when transmission is necessary,
The incoming call only function is
The charging server is provided between the application server facing the base station and the base station and is communicably connected to the application server facing the base station. The charging pulse instruction from the application server An analog control signal for charging is sent to the base station based on the control signal indicating
2. The communication system according to claim 1, wherein the base station performs an operation of sending a coin storage signal for billing to the mobile public telephone.   4. The communication system according to claim 2, wherein the incoming call exclusive function is configured to be built in or externally attached to the IP conversion function. The application server is
The first server function;
The second server function;
A billing information generating function for generating billing information based on the destination telephone number and pre-created table data;
A call frequency management function for updating the call frequency based on the generated billing information,
The base station
Provided on the IP network,
The incoming call only function;
An IP conversion function of the calling side;
A billing information generating function for generating billing information based on the connection destination telephone number and pre-created table data;
Via the subscriber server facing the base station, connected to the application server so as to be communicable,
Receives an off-hook response signal of the subscriber telephone from the application server via the subscriber server opposite to the base station, and periodically sends out an accounting for the off-hook response signal An operation for sending a periodic storage signal to the mobile public telephone is performed.
The communication system according to claim 1. A subscriber server that stores information of subscribers who subscribe to a service that uses an IP telephone on an IP network, and that connects to a subscriber telephone that the subscriber uses;
The base station charge area information is accumulated, and the call from the mobile public telephone indicating the public telephone mounted on the mobile unit via the base station is transferred via the IP network based on the connected telephone number. An application server for sending out the subscriber server that accommodates the subscriber telephone to which a public telephone is connected;
An IP converter for converting call control signals and voice signals used in the PSTN from the subscriber telephone to signals used on the IP network; and
An incoming call dedicated function for sending a control signal used on the IP network as a signal for controlling a call incoming from the mobile public telephone side;
A communication method in a communication system comprising an IP conversion function on a transmission side for converting an analog voice signal from the mobile public telephone side into an IP packet,
The application server is
A control signal receiving step for directly or indirectly receiving the control signal transmitted by the incoming call-only function;
An information addition step of adding a mobile public parameter indicating that the call is from the mobile public telephone and a charge area information of the base station via the call as a header or a parameter to the received signal When,
A communication method characterized in that the communication method is executed. The subscriber server facing the base station is
Receiving the control signal sent by the incoming call-only function;
Receiving the control signal from the incoming call-only function, determining that the call is originating from the mobile public telephone, and transferring the received control signal to the application server,
The application server stores charging pulse transmission necessity data for each base station or each base station operator,
Receiving the control signal via the subscriber server that is sent by the incoming call-only function and is opposite the base station;
Only when the call from the mobile public telephone indicated by the received control signal is required to send a billing pulse, a step of sending a control signal indicating a billing pulse instruction after establishing a call,
The incoming call only function is
A step of sending a charging pulse indicating an analog control signal for charging to the base station when a control signal indicating the charging pulse instruction is directly or indirectly received from the application server;
The base station
A step of sending a coin storage signal for charging to the mobile public telephone when receiving the charging pulse;
The communication method according to claim 6. The application server is
The charging pulse transmission necessity data for each base station or base station operator is accumulated, and the call is transmitted from the mobile public telephone by directly receiving the control signal from the incoming call dedicated function. Determining that there is, based on the received control signal, performing a step of sending a control signal indicating a billing pulse instruction after establishing a call only when a call from the mobile public telephone is required to send a billing pulse;
The incoming call only function is
Receiving a control signal indicating the charging pulse instruction from the application server;
Sending a charging pulse indicating an analog control signal for charging to the base station upon receiving a control signal indicating the charging pulse instruction, and
The base station
Receiving the charging pulse;
Sending a coin storage signal for billing to the mobile public telephone;
The communication method according to claim 6. The base station
Provided on the IP network with the incoming call dedicated function,
The subscriber server facing the base station is
Receiving a control signal used on the IP network as a signal for controlling an incoming call from the mobile public telephone side, which is transmitted by the base station;
Receiving the control signal from the base station, determining that the call is originating from the mobile public telephone, and transferring the received control signal to the application server,
The application server is
Receiving the control signal sent by the base station via the subscriber server opposite the base station;
The base station
Receiving from the application server an off-hook response signal of the subscriber telephone via the subscriber server opposite the base station;
Performing a step of sending a periodic storage signal to be periodically sent out for billing to the mobile public telephone, triggered by the received response signal,
The communication method according to claim 6. A subscriber server that stores information of subscribers who subscribe to a service that uses an IP telephone on an IP network, and that connects to a subscriber telephone that the subscriber uses;
The subscriber telephone that is a connection destination of the mobile public telephone via the IP network based on a connection telephone number based on a call destination from the mobile public telephone showing a public telephone mounted on the mobile body An application server that sends the subscriber server that accommodates
An IP converter for converting call control signals and voice signals used in the PSTN from the subscriber telephone to signals used on the IP network; and
A control signal used on the IP network as a signal for controlling a call incoming from the mobile public telephone side, an incoming call dedicated function for sending the application server as a destination;
The application server in a communication system having an IP conversion function on the transmission side that converts an analog voice signal from the mobile public telephone side into an IP packet,
The control signal sent by the incoming call-dedicated function is received directly or indirectly, and a mobile public parameter indicating that the call is originated from the mobile public telephone is added to the received signal as a header or a parameter. A first server function;
The base station charge area information is accumulated, the control signal sent by the incoming call dedicated function is received directly or indirectly, and the base station charge area information via the call is received with respect to the received signal. A second server function to be added as a header or parameter
A billing information generating function for generating billing information based on the destination telephone number and pre-created table data;
A call frequency management function for updating the call frequency based on the generated billing information;
A charging pulse transmission function for accumulating charging pulse transmission necessity data for each base station or each base station operator and transmitting a control signal indicating a charging pulse instruction after establishing a call only when transmission is necessary. Application server.

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