JP5652006B2 - Relay system, terminal device, short message relay method, and computer program - Google Patents

Description

  The present invention relates to a technique for exchanging short messages.

  In recent years, mobile communication services using Personal Handy-phone System (PHS) or mobile phone communication systems have become widespread. The mobile communication service includes various services such as a service for connection to the Internet and a Global Positioning System (GPS) service as well as a call service.

  As one of mobile communication services, there is a service called “Short Message Service (SMS)”. SMS is a service for exchanging messages called “short messages” between two terminal devices (mobile stations). In PHS, two terminal devices exchange short messages by a circuit switching method via a D channel.

JP-A-7-143555

  A portable radio device (terminal device) has a function of a mobile device of a mobile phone system and a function of a mobile device of a radio selective call system which are independent from each other, that is, a function of a mobile phone and a function of a radio selective call receiver. Thus, a message can be received even during a call (Patent Document 1).

  However, a terminal device that does not have the function of a radio selective call receiver, such as a PHS terminal device, cannot receive a short message when a call is in progress.

  The present invention has been made in view of such problems, and an object of the present invention is to make it possible to receive a short message even when a terminal device that does not have the function of a radio selective call receiver is busy.

A relay system according to an aspect of the present invention is a relay system that relays a transmission target short message that is a short message transmitted from a second terminal device to a first terminal device, and is used for voice exchange. A communication state determining means for determining whether or not the first terminal device is communicating with a third terminal device by a circuit switching method via a voice channel which is a communication channel to be transmitted; and the first terminal device Is a voice channel specifying means for specifying the voice channel used by the first terminal device and a communication channel for controlling the specified voice channel when it is determined that the communication is performed. A first message used to transfer the short message to be transmitted via the control channel when the communication is not performed. The type of the message included in the different second type of message has a transfer means for transferring to said first terminal device, the voice channel is an B channel of ISDN (Integrated Services Digital Network) , The control channel is a D channel of ISDN, and the first type is Q.I. 931, and the second type is Q.931. The transmission means transmits a first INFO message that is an INFO message including the transmission target short message to UUI (User-to-user Information). Forward.

  Alternatively, the transfer means transmits the first INFO message by including a first code, which is a code indicating that the short message to be transmitted is included, in a UUI of the first INFO message. .

Alternatively, when a second INFO message that is an INFO message included in the UUI is received from the first terminal device, the second code that indicates that the transmission target short message has been received. ALERT transmitting means for transmitting an ALERT message including information indicating that the transmission target short message has arrived to the second terminal device .
A terminal device according to an aspect of the present invention communicates with another terminal device when the terminal device communicates with the other terminal device via a voice channel that is a communication channel used for voice exchange. A second type of message that is different from the first type of message used to receive the short message when not being received from the relay system via the control channel, which is a communication channel for controlling the voice channel. Receiving means for storing, when the received message contains a short message, storage means for saving the short message in a predetermined storage area, and the fact that the short message has been received by the second type message Transmitting means for transmitting to the relay system, and the voice channel is an ISDN (Integrated Services Di). Gital Network) B channel, the control channel is an ISDN D channel, and the first type is Q.Q. 931, and the second type is Q.931. The receiving means receives the shortcut message by receiving an INFO message including the short message in UUI (User-to-user Information).

  According to the present invention, even a terminal device that does not have a function of a radio selective call receiver can receive a short message during a call.

It is a figure which shows the example of the whole structure of a communication system. It is a figure which shows the example of a structure of a switching center. It is a figure which shows the example of a structure of a terminal device. It is a figure which shows the example of a call information management table and call information. It is a figure which shows the example of a terminal information management table and terminal information. It is a sequence diagram for demonstrating the flow of a process of a switching center and a terminal device. It is a figure which shows the example of a structure of the transmission process part at the time of a telephone call. It is a figure which shows the example of a format of an INFO message. It is a figure which shows the example of a format of an INFO message. It is a figure which shows the example of call information. It is a figure which shows the example of terminal information. It is a figure which shows the example of terminal information. It is a figure which shows the example of call information. It is a figure which shows the example of terminal information. It is a figure which shows the example of call information. It is a flowchart explaining the example of the flow of the whole process of a switching center. It is a flowchart explaining the example of the flow of the whole process of a switching center. It is a flowchart explaining the example of the flow of the whole process of a terminal device. It is a flowchart explaining the example of the flow of the whole process of a terminal device.

  FIG. 1 is a diagram illustrating an example of the overall configuration of the communication system TS.

  A communication system TS shown in FIG. 1 is a system for allowing mobile communication service subscribers to talk and exchange electronic data. Hereinafter, a case where Personal Handy-phone System (PHS) is used as a mobile communication system will be described as an example.

  As shown in FIG. 1, the communication system TS includes a switching center 1, base stations 2A, 2B, 2C,... And terminal devices 3A, 3B, 3C,.

  Hereinafter, for simplicity of explanation, a case where three terminal devices 3A, 3B, and 3C located in a certain area X communicate with each other will be described as an example. The terminal device 3A is located in the cell of the base station 2A, the terminal device 3B is located in the cell of the base station 2B, and the terminal device 3C is located in the base station 2C. The base stations 2A, 2B, and 2C may be collectively referred to as “base station 2”, and the terminal apparatuses 3A, 3B, and 3C may be collectively referred to as “terminal apparatus 3”.

  The exchange 1 and the base station 2 in the area X are connected by a communication line. The base station 2 communicates with the terminal device 3 located in the cell of the base station 2 by radio.

  The switching center 1 connects the base station 2 of the cell in which the terminal device 3 on the calling side is located with the base station 2 in the cell on which the terminal device 3 on the called side is located, and controls communication between both terminal devices 3 To do.

  The exchange 1 performs processing for various services, one of which is processing for Short Message Service (SMS). SMS is a service that can send and receive messages with a terminal phone number (so-called mobile phone number) as a destination. This message is generally called “short message” or “short mail”, and the length of the message is stricter than that of electronic mail handled on the Internet. In short, it must be short.

  In the present embodiment, the switching center 1 performs various processes so that even if a certain terminal device 3 transmits a short message to the terminal device 3 that is in a call, the short message arrives. This mechanism will be described later. The exchange 1 may be a so-called local exchange or a private branch exchange (PBX).

  The base station 2 relays communication between the switching center 1 and terminal devices 3 in the vicinity of the base station 2. The base station 2 may also be called “BS (Base Station)”, “Node-B”, “BTS (Base Transfer Station)”, or the like.

  FIG. 2 is a diagram illustrating an example of the configuration of the switching center 1. FIG. 3 is a diagram illustrating an example of the configuration of the terminal device 3. FIG. 4 is a diagram illustrating an example of the call information management table 101 and the call information 5. FIG. 5 is a diagram illustrating an example of the terminal information management table 102 and the terminal information 6.

  As shown in FIG. 2, the switching center 1 includes a call information management table 101, a terminal information management table 102, a short message relay processing unit 103, and the like. The functions of the units shown in FIG. 2 may be realized only by hardware, or some functions may be realized by controlling the hardware by a central processing unit (CPU) based on a program. The same applies to the functions of the terminal device 3.

  As shown in FIG. 3, the terminal device 3 includes an INFO message reception processing unit 301, a message processing unit 302 during a call, a SETUP message reception processing unit 303, a message processing unit 304 during non-calling, and the like.

  In FIG. 2, the call information management table 101 stores a predetermined number of call information 5 as shown in FIG. The call information 5 is given a unique call number for identifying each.

  Each time a call is made from the terminal device 3, one piece of call information 5 that is not currently assigned to any other call is selected and assigned to the outgoing call. Then, in the assigned call information 5, information related to the terminal device 3 on the transmission side, information related to the terminal device 3 on the reception side, and the like are recorded.

  Call information 5 includes call state, caller information, caller BS number, caller channel number, caller terminal logical number, caller message notification call number, callee information, callee BS number, callee channel number. And information such as a callee terminal logical number and a call number for callee message notification.

  “Call state” indicates a call state. Specifically, it indicates one of outgoing, incoming call, and telephone call. “During outgoing” is a state in which a call is made from the terminal device 3 on the outgoing side, but the call has not yet reached the terminal device 3 on the incoming side. “Incoming” is a state in which a call arrives at the terminal device 3 on the receiving side and a call is being made. “During a call” is a state in which a session between the terminal device 3 on the calling side and the terminal device 3 on the receiving side is established. That is, it is a state in which a call is being made.

  However, the call state of the unused call information 5 indicates “0” meaning that it is not used.

  “Sender information” is the telephone number of the terminal device 3 on the call origination side. “Recipient information” is the telephone number of the terminal device 3 on the call receiving side.

  The “caller BS number” is the BS number of the base station 2 of the cell where the terminal device 3 on the call origination side is located. The “BS number” is a number given to each base station 2 for identifying the base station 2. The “receiver BS number” is the BS number of the base station 2 of the cell where the terminal device 3 on the call receiving side is located.

  The “caller channel number” is the channel number of the channel used by the terminal device 3 on the call origination side. The “channel number” is a number for identifying a channel given to each channel. “Destination channel number” is the channel number of the channel used by the terminal device 3 on the call receiving side.

  The “caller terminal logical number” is the terminal logical number of the terminal information 6 assigned to the terminal device 3 on the call origination side. The terminal information 6 will be described later. The “terminal logical number” is a number for identifying the terminal information 6 given to each terminal information 6. The “caller terminal logical number” is the terminal logical number of the terminal information 6 assigned to the terminal device 3 on the call origination side.

  The “caller message notification call number” is the call number of the call information 5 assigned to the transmission source that transmitted the short message to the terminal device 3 when the terminal device 3 on the call origination side is busy. is there. However, when there is no short message exchange, the caller message notification call number indicates “0”. The “call number for caller message notification” is the call number of the call information 5 assigned to the transmission source that transmitted the short message to the terminal device 3 when the terminal device 3 on the call receiving side is busy. is there. However, when there is no short message exchange, the call number for caller message notification indicates “0”.

  Returning to FIG. 2, terminal information 6 for each terminal device 3 is stored in the terminal information management table 102 as shown in FIG. 5.

  The terminal information 6 includes information such as a telephone number, a call number, and a location registration area number.

  “Telephone number” is the telephone number of the terminal device 3 to which the terminal information 6 is assigned. “Call number” is the call number of the call information 5 assigned to the terminal device 3. However, when communication is not performed, the call number is “0”. The “location registration area number” is an area number of an area where the terminal device 3 is located. The “area number” is a number assigned to each area for identifying the area.

  The terminal information 6 is generated when the terminal device 3 is connected to the exchange 1 for the first time, and is registered in the terminal information management table 102.

  Returning to FIG. 2, the short message relay processing unit 103 includes a SETUP message reception processing unit 131, an incoming call side state determination unit 132, a channel determination unit 133, a busy transmission processing unit 134, a completion notification transmission processing unit 135, a non-call A middle-time transmission processing unit 136;

  Each unit of the short message relay processing unit 103 performs processing for relaying the short message from one terminal device 3 to the other terminal device 3.

  Each part of the terminal device 3 shown in FIG. 3 performs processing for receiving a short message even during a call.

  Here, taking as an example a case in which the terminal device 3C transmits a short message to the terminal device 3A in communication with the terminal device 3B, the processing of each part of the short message relay processing unit 103 and the terminal device 3 (3A) is a sequence diagram. This will be described with reference to the above.

  FIG. 6 is a sequence diagram for explaining the processing flow of the exchange 1, the terminal device 3B, and the terminal device 3C. FIG. 7 is a diagram illustrating an example of the configuration of the transmission processing unit 134 during a call. FIG. 8 is a diagram illustrating an example of the format of the INFO message 72. FIG. 9 is a diagram illustrating an example of the format of the INFO message 73.

  The terminal device 3C transmits a short message to the terminal device 3A by a SETUP message as usual (# 381 in FIG. 6). Specifically, the terminal device 3 </ b> C generates a SETUP message 71 including User-to-user Information (UUI) indicating the text of the short message, a calling party number, a called party number, and the like, and transmits the SETUP message 71 to the switching center 1. The “calling number” is a telephone number on the calling side, and in this example is the telephone number of the terminal device 3C. “Destination number” is the telephone number on the receiving side, and in this example, the telephone number of the terminal device 3A. Note that the “SETUP message” is the Q.2 of the International Telecommunications Union Telecommunication Standardization Sector (ITU-T). This is a type of message defined in the 931 standard. An INFO message, an ALERT message, and a CALLPROC message, which will be described later, are also included in Q. It is defined in the 931 standard.

  In the exchange 1, the SETUP message reception processing unit 131 receives the SETUP message 71 from the terminal device 3C (# 161), and returns a CALLPROC message to the transmission source, that is, the terminal device 3C (# 162).

  The called-side state determination unit 132 determines whether or not the terminal device 3 having the called number indicated in the SETUP message 71, that is, the terminal device 3A is busy.

  The called side state determination unit 132 searches the terminal information management table 102 for the terminal information 6 in which the called number is indicated as a telephone number. If the call number of the terminal information 6 is “0”, the receiving side state determination unit 132 determines that the terminal device 3A is not informing. On the other hand, when some kind of call number is indicated, the receiving-side state determination unit 132 determines that the terminal device 3A is not informing.

  In the present embodiment, since the two terminal devices 3 communicate with each other by the circuit switching method, if the receiving side state determination unit 132 can determine that the terminal device 3A is busy, the circuit switching method It is determined that a call is made.

  When the telephone number of the terminal device 3A is indicated in the caller information of the call information 5 having the call number of the searched terminal information 6, the channel determination unit 133 indicates the caller BS number and the call origination indicated in the call information 5. It is determined that the channel determined by the user channel number is the B channel that the terminal device 3A is currently using for a call. On the other hand, when the telephone number of the terminal device 3A is indicated in the callee information of the call information 5, the terminal device 3A is currently calling the channel determined by the callee BS number and the callee channel number indicated in the call information 5. It is determined that the B channel is used for the purpose.

  As shown in FIG. 7, the transmission processing unit 134 during a call includes a call information setting unit 13E, a terminal information setting unit 13F, a short message transmission processing unit 13G, and a completion notification reception processing unit 13H. With such a configuration, the transmission processing unit 134 during a call displays the text of the short message included in the SETUP message 71 when the terminal device 3A determines that the terminal device 3A is busy. The process for transmitting to the device 3A is performed as follows.

  The call information setting unit 13E and the terminal information setting unit 13F perform processing related to setting of the call information 5 and the terminal information 6. This process will be described later.

  The short message transmission processing unit 13G generates an INFO message 72 as shown in FIG. 8, and transmits the INFO message 72 to the terminal device 3A via the D channel that is a pair of B channels determined (specified) by the channel determining unit 133 (# 163). As shown in FIG. 8, the INFO message 72 includes a message type, an information element identifier, an application content length, application information, and the like.

  “Message type” indicates the type of the INFO message 72, and in this example, indicates “INFO message”.

  “Information element identifier” and “application content length” indicate the type and length of application information, respectively. In this example, UUI is used as application information. Therefore, the UUI identifier is indicated in the information element identifier.

  In addition to the calling number and the body of the short message, the application information, that is, the UUI includes information indicating the length (calling number content length and message content length) and an application identifier. In this example, a transmission notification code is used as the application identifier. The “transmission notification code” is a unique code for notifying that a short message is transmitted.

  In the terminal device 3A, the INFO message reception processing unit 301 receives the INFO message 72 from the exchange 1 (# 361).

  As shown in FIG. 3, the message processing unit 302 during a call includes a transmission notification code confirmation unit 321, a short message storage processing unit 322, an incoming notification processing unit 323, an INFO response processing unit 324, and the like. With such a configuration, the message processing unit 302 during a call performs a process of receiving a short message during a call as follows.

  The transmission notification code confirmation unit 321 confirms whether or not the transmission notification code is indicated in the UUI of the INFO message 72.

  When it is confirmed that the transmission notification code is indicated in the UUI of the INFO message 72, the short message storage processing unit 322 extracts the calling number and the body of the short message from the INFO message 72, and stores the short message data indicating these. The data is stored in a predetermined storage area such as a message box of the terminal device 3A itself (# 362).

  The incoming call notification processing unit 323 displays an image such as an icon or a pictograph on the display, sounds a sound, or vibrates the vibrator to notify the user that the short message has been received (# 363).

  The INFO response processing unit 324 sends a reply indicating that the short message has been received by transmitting the INFO message (# 364).

  Specifically, the INFO response processing unit 324 generates an INFO message 73 as shown in FIG. 9 and transmits the INFO message 73 to the switching center 1 via the D channel which is a pair of B channels currently used for a call. . As shown in FIG. 9, the INFO message 73 includes a message type, an information element identifier, an application content length, application information, and the like. As can be seen from comparison with FIG. 8, the structure of the INFO message 73 is basically the same as that of the INFO message 72. However, the contents of the application information are different.

  A reception notification code is used for the application information of the INFO message 73, that is, the application identifier of the UUI. The “reception notification code” is a unique code for notifying that a short message has been received. In general, so-called application general-purpose data (user data) can be included in the INFO message, but the application general-purpose data is not included in the INFO message 73. Therefore, information (application general data length) indicating that the length of the field for placing user data is 0 is shown in the INFO message 73.

  In the exchange 1, the completion notification reception processing unit 13H receives the INFO message 73 from the terminal device 3A (# 164).

  Then, the call information setting unit 13E and the terminal information setting unit 13F perform a process for releasing the call information 5. This process will be described later.

  Then, the completion notification transmission processing unit 135 transmits an ALERT message indicating that the relay of the short message is completed to the terminal device 3C (# 165).

  On the other hand, when it is determined by the incoming side state determination unit 132 that the terminal device 3A is not in a call, the non-calling transmission processing unit 136 transmits a SETUP message 71 to the terminal device 3A by a conventional method.

  Then, in the terminal device 3 </ b> A, the SETUP message reception processing unit 303 receives the SETUP message 71 from the exchange 1.

  When the body of the short message is indicated in the UUI of the SETUP message 71, the message processing unit 304 during non-calling appropriately executes a process for notifying the user by means of an image or sound, etc. To do.

  FIG. 10 is a diagram illustrating an example of the call information 51. FIG. 11 is a diagram illustrating an example of the terminal information 62. FIG. 12 is a diagram illustrating an example of the terminal information 61 and 62. FIG. 13 is a diagram illustrating an example of the call information 51 and 52. FIG. 14 is a diagram illustrating an example of the terminal information 61 and 62. FIG. 15 is a diagram illustrating an example of the call information 51 and 52.

  As described above, the call information setting unit 13E and the terminal information setting unit 13F perform processing for setting and releasing the call information 5 and the terminal information 6. Here, these processes are performed with reference to an example in which the terminal device 3C transmits a short message to the terminal device 3A in response to a call from the terminal device 3B and in the middle of a call with the terminal device 3B. This will be described with reference to FIG.

  Before the terminal device 3C transmits a short message to the terminal device 3A and when the terminal device 3A makes a call with the terminal device 3B, for example, call information 51 as shown in FIG. This is used as call information 5 for a call with the device 3B. Further, for example, terminal information 61 as shown in FIG. 11 is used as the terminal information 6 of the terminal device 3A.

  As shown in FIG. 10, since the short message has not yet been transmitted from the terminal device 3C, the call number for caller message notification in the call information 51 is “0”. In addition, although the terminal information 6 of the terminal device 3B is already set, description is abbreviate | omitted.

  When the terminal device 3C transmits a SETUP message 71 with a short message addressed to the terminal device 3A and the switching center 1 receives the SETUP message 71, the terminal information setting unit 13F displays, for example, the terminal information 62 shown in FIG. Register as terminal information 6 of 3C. At this time, the call number of the terminal information 62 is “0”. However, when the terminal information 6 of the terminal device 3C is already registered, it is not necessary to newly register.

  The call information setting unit 13E sets, for example, call information 52 shown in FIG. 13 as the call information 5 for the relay communication of the short message.

  Then, the terminal information setting unit 13F sets the call number of the call information 52 to the call number of the terminal information 62, as shown in FIG. Further, the call information setting unit 13E sets the call number of the call information 52 to the call number for the callee message of the call information 51 as shown in FIG.

  After these settings, the short message transmission processing unit 13G uses resources based on each call information 5 and each terminal information 6, and relays the short message to the terminal device 3A in the above-described procedure.

  When the short message transmission processing unit 13G receives the INFO message 73, that is, the short message reception completion message, the call information setting unit 13E releases the call information 52 and returns it to the unused state. The call number for caller message notification in the information 51 is returned to “0”. The terminal information setting unit 13F returns the call number of the terminal information 62 to “0”.

  16 and 17 are flowcharts for explaining an example of the overall processing flow of the exchange 1. 18 and 19 are flowcharts for explaining an example of the overall processing flow of the terminal device 3.

  Next, the overall processing flow of the switching center 1 and the terminal device 3 will be described with reference to the flowcharts of FIGS.

  16 and 17, when the exchange 1 receives the SETUP message from the terminal device 3 (# 801), it searches the call information management table 101 for free (unused) call information 5; Allocation is performed for the terminal device 3 (# 802). The switching center 1 sets “1 (calling)” in the “call state” item of the call information 5 (# 803) and sets the “call number” item in the terminal information 6 of the terminal device 3 The call number of the call information 5 is set (# 804). The exchange 1 also sets the status regarding the terminal device 3 in the other items of the call information 5 and the terminal information 6.

  The exchange 1 checks the call number of the terminal information 6 of the terminal device 3 that is the destination of the SETUP message (# 805). If the call number is not “0” (No in # 807), the switching center 1 checks whether or not the text of the short message is included in the UUI of the SETUP message. If it is not listed (No in # 808), the answering machine service process or the so-called interrupt call process is performed as necessary (# 809).

  On the other hand, if it is listed (Yes in # 808), the exchange 1 transmits the call information 5 of the call of the terminal device 3 that is the transmission destination (that is, the call information 5 having the call number checked in Step # 805). The call number of the call information 5 assigned to the terminal device 3 of the transmission source is set in either one of the call number for caller message notification and the call number for callee message notification (# 810). Specifically, when the call of the destination terminal device 3 is established by its own call, the caller message notification call number is set. When the call is established by the incoming call, the callee message notification call number is set. Set to.

  Then, the switching center 1 transmits the text of the short message to the destination terminal device 3 together with the transmission notification code, which is a unique code, by the INFO message 72 (# 811). At this time, the switching center 1 specifies the B channel used by the terminal device 3 that is the transmission destination, and transmits this INFO message 72 via the D channel corresponding to the B channel.

  Thereafter, when the switching center 1 receives the INFO message 73 from the terminal device 3 of the transmission destination (# 812), if the reception notification code is included in the INFO message 73, the exchange of the line used for the exchange of the INFO message 73 will be described. The call information 5 of the call number is searched. Further, the exchange 1 extracts the call number set in the caller message notification call number or the callee message notification call number of the retrieved call information 5 (# 813).

  Then, the exchange 1 searches the call information 5 of the extracted call number (# 814), and reports the completion of the transmission of the short message to the sender of the short message based on the searched call information 5. This is performed by the ALERT message (# 820). Further, the call information 5 assigned to the terminal device 3 of the transmission source is released, the caller message notification call number (or the call number for callee message notification) of the call information 5 of the transmission destination, and the terminal information 6 of the transmission source. Is reset (# 821). As a result, the call of the transmission source terminal device 3 is released. The destination terminal device 3 continues the call with the other party (# 822).

  On the other hand, if the call number checked in step # 805 is “0” (Yes in # 807), the switching center 1 determines that the terminal device 3 as the transmission destination is not in a call and processes the call as usual. Alternatively, short message relay processing is performed as follows.

  If the body of the short message is not included in the SETUP message received in step # 801 (No in # 815), the switching center 1 establishes a session between the two terminal devices 3 for a call according to the SETUP message. Processing is performed (# 816).

  Alternatively, when the text of the short message is included (Yes in # 815), the switching center 1 transmits the short message to the destination terminal device 3 by the SETUP message (# 817). At this time, a session is established between the terminal device 3 that is the transmission source and the terminal device 3 that is the transmission destination, and the call information 5 and the terminal information 6 are set. Further, when receiving the ALERT message of completion of reception from the transmission destination terminal device 3 (# 818), the switching center 1 performs processing for releasing the call information 5 used this time and the like, and also transmits the terminal device of the transmission source as usual. 3, an ALERT message indicating completion of reception is transmitted (# 819).

  18 and 19, when the terminal device 3 receives the INFO message from the switching center 1 (Yes in # 851), if the transmission notification code is included in the UUI of the received INFO message (in # 852) Yes, Yes in # 853), the telephone number of the caller and the text of the short message are extracted from the UUI (# 854, # 855). Data indicating the extracted telephone number of the caller and the text of the short message is stored in a message box or the like (# 856), and the user is notified of the reception by image, voice, or vibration (# 857). Then, an INFO message 73 including a reception notification code is returned to the exchange 1 (# 858).

  On the other hand, when the text of the short message is not included in the UUI of the received INFO message (No in # 852 or No in # 853), the terminal device 3 performs the conventional processing according to the INFO message (# 859).

  Alternatively, if the terminal device 3 receives the SETUP message from the exchange 1 (No in # 852), if the text of the short message is included in the UUI of the received SETUP message (Yes in # 860), the terminal device 3 continues as usual. Then, processing such as reception and storage of the short message is performed (# 861 to # 865). The processing contents are basically the same as those in steps # 854 to # 858, except that the source of the short message body is different.

  On the other hand, if the text of the short message is not included (No in # 860), the processing for the call is performed as usual, such as by ringing an incoming call or establishing a session (# 866).

  According to this embodiment, a terminal device that does not have the function of a radio selective call receiver can receive a short message even during a call.

  In the present embodiment, the exchange of short messages in the PHS has been described as an example, but the present invention can also be applied to the exchange of short messages in other communication forms.

  In addition, the configuration of the communication system TS, the switching center 1, the terminal device 3, or the components, processing contents, processing order, table configuration, message configuration, and the like can be changed as appropriate within the spirit of the present invention. .

1 Switching office (relay system)
2 Base station (relay system)
132 Calling party state determination unit (communication state determination means)
133 Channel discriminating unit (voice channel specifying means)
134 Transmission processing unit during transfer (transfer means)
135 Completion notification transmission processing unit (ALERT transmission means)
3 Terminal device 301 INFO message reception processing unit (reception means)
322 Short message storage processing unit (storage means)
324 INFO response processing unit (transmission means)
71 SETUP message 72 INFO message 73 INFO message

Claims (7)

A relay system that relays a short message to be transmitted that is a short message transmitted from the second terminal device to the first terminal device;
A communication state determining means for determining whether or not the first terminal device is communicating with a third terminal device by a circuit switching method via a voice channel which is a communication channel used for voice exchange;
An audio channel specifying means for specifying the audio channel used by the first terminal device when it is determined that the first terminal device is performing the communication;
A first type of message used to transfer the short message to be transmitted via the control channel, which is a communication channel for controlling the specified voice channel, when the communication is not performed. Transfer means for transferring to the first terminal device in a second type message different from
Have
The voice channel is a B channel of ISDN (Integrated Services Digital Network),
The control channel is a D channel of ISDN,
The first type is Q.I. 931 SETUP,
The second type is Q.I. 931 INFO,
The transfer means transfers the transmission target short message by transmitting a first INFO message that is an INFO message including the transmission target short message to UUI (User-to-user Information).
RELAY system. The transfer means transmits the first INFO message by including a first code, which is a code indicating that the transmission target short message is included, in a UUI of the first INFO message.
The relay system according to claim 1 . When a second INFO message, which is an INFO message included in the UUI, is received from the first terminal device, the second code, which is a code indicating that the transmission target short message has been received. ALERT transmission means for transmitting an ALERT message including information indicating that the target short message has arrived to the second terminal device;
Claim 2 Symbol placing relay system. To receive a short message when communicating with another terminal device via a voice channel, which is a communication channel used for voice exchange, when not communicating with the other terminal device. Receiving means for receiving a second type message different from the first type message to be used from the relay system via a control channel which is a communication channel for controlling the voice channel;
A storage means for storing the short message in a predetermined storage area when the received message includes a short message;
A transmission means for transmitting to the relay system by the second type message that a short message has been received;
Have
The voice channel is a B channel of ISDN (Integrated Services Digital Network),
The control channel is a D channel of ISDN,
The first type is Q.I. 931 SETUP,
The second type is Q.I. 931 INFO,
The receiving means receives the shortcut message by receiving an INFO message including the short message in UUI (User-to-user Information).
Terminal device. In the relay system,
Executing a process of receiving a transmission target short message that is a short message transmitted from the second terminal device to the first terminal device;
A process for determining whether or not the first terminal device is communicating with a third terminal device by a circuit switching method via a voice channel which is a communication channel used for voice exchange;
When it is determined that the first terminal device is performing the communication, a process for specifying the voice channel used by the first terminal device is executed.
A first type of message used to transfer the short message to be transmitted via the control channel, which is a communication channel for controlling the identified voice channel, to transfer the short message when the communication is not performed; Is included in a second message of a different type and executed to transfer to the first terminal device,
In the first terminal device,
Causing the second type of message to be received;
Extracting the short message to be transmitted from the received second type message and executing a process for storing it in a predetermined storage area ,
The voice channel is a B channel of ISDN (Integrated Services Digital Network),
The control channel is a D channel of ISDN,
The first type is Q.I. 931 SETUP,
The second type is Q.I. 931 INFO,
The transmission target short message is included in UUI (User-to-user Information) of an INFO message and transferred from the relay system to the first terminal device.
Short message relay method. A computer program used for a relay device that performs processing for relaying a short message to be transmitted that is a short message transmitted from a second terminal device to the first terminal device,
In the relay device,
A process for determining whether or not the first terminal device is communicating with a third terminal device by a circuit switching method via a voice channel which is a communication channel used for voice exchange;
When it is determined that the first terminal device is performing the communication, a process for specifying the voice channel used by the first terminal device is executed,
A first type of message used to transfer the short message to be transmitted via the control channel, which is a communication channel for controlling the specified voice channel, when the communication is not performed. to execute the process of transferring to a different second be included in the type of message the first terminal device and,
The voice channel is a B channel of ISDN (Integrated Services Digital Network),
The control channel is a D channel of ISDN,
The first type is Q.I. 931 SETUP,
The second type is Q.I. 931 INFO,
The process of transferring is a process of transmitting an INFO message including the short message to be transmitted to UUI (User-to-user Information).
Computer program. On the terminal device,
To receive a short message when communicating with another terminal device via a voice channel, which is a communication channel used for voice exchange, when not communicating with the other terminal device. Executing a process of receiving a second type message different from the first type message to be used from the relay system via a control channel which is a communication channel for controlling the voice channel;
When the received message includes a short message, the processing for saving the short message in a predetermined storage area is executed,
The fact that a short message has been received is transmitted to the relay system by the second type message ,
The voice channel is a B channel of ISDN (Integrated Services Digital Network),
The control channel is a D channel of ISDN,
The first type is Q.I. 931 SETUP,
The second type is Q.I. 931 INFO,
The process of receiving is a process of receiving an INFO message including the short message in UUI (User-to-user Information).
Computer program.

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