JP2009302950A - Network system, information registration method, communication apparatus and communication program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a period of time, if a communication apparatus that is registered as accommodated in a network is disabled from accessing the network, during which registration information relating to the communication apparatus is kept on a side of the network. <P>SOLUTION: The present invention relates to a network system that includes a communication apparatus accommodated in a network, and an information registration device for registering communication apparatus information relating to the communication apparatus, while the communication apparatus is accommodated in the network. The network system is characterized in including a means for calculating and applying registration validity of the communication apparatus information, when registering or updating the communication apparatus information in the information registration device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a network system, an information registration method, a communication device, and a communication program. For example, the present invention can be applied to a network system in which a communication terminal is accommodated in a network and communicates using SIP (Session Initiation Protocol).

  Conventionally, for a communication terminal that can access both a CS (Circuit Switched) network and an IMS (IP Multimedia Subsystem) network, there is a method using a VCC (Voice Call Continuity) server as a method of seamlessly switching the destination network. Yes (see Non-Patent Documents 1 and 2). Hereinafter, a communication terminal compatible with VCC is referred to as a “VCC terminal”.

  In a system using a VCC server, the VCC terminal switches to the VCC server through the network while being able to access both of the CS network and the IMS network and can communicate with itself. Can be switched from the CS network to the IMS network, or from the IMS network to the CS network. Incoming calls to VCC terminals that are accessible to both the CS network and the IMS network are stored information on the network side (if the information is stored in the network but set according to the request of the VCC terminal) Is connected to the VCC terminal via either network.

When the VCC terminal becomes accessible from the area accessible only to the CS network to the IMS network, the SIP REGISTER message is sent from the VCC terminal to the IMS when the access to the IMS network becomes possible. The VCC terminal registers information related to itself (hereinafter referred to as “accommodated terminal information”) in a database on the IMS network. While the accommodation terminal information by the REGISTER message described above is registered, if there is an incoming call to the VCC terminal in the IMS network, the call processing server on the IMS network performs call processing based on the registered accommodation terminal information. Therefore, connection is attempted as if it is accommodated in the IMS network.
IETF RFC3261 3rd Generation Partnership Project (3GPP), “Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (Month. Search], <URL: http://www.3gpp.org/FTP/Specs/html-info/23206.htm>

  The accommodation terminal information by the above REGISTER message generally has an expiration date, and the VCC terminal sends out a REGISTER message for updating the expiration date before the expiration date. If the expiration date expires without being updated, the accommodation terminal information is invalidated, for example, by being deleted. Even if the VCC terminal moves to an area where it cannot access the IMS network before the expiration date, a REGISTER message that explicitly deletes its own terminal information from the VCC terminal before entering such a state. If it is not transmitted, it will try to connect based on the accommodated terminal information that is invalid for the incoming call to the VCC terminal to the IMS network until the registered accommodated terminal information expires. In particular, such a phenomenon is likely to occur when a VCC terminal moves near the boundary between an area where the IMS terminal can access the IMS network and an area where the VCC terminal cannot access.

  Therefore, when a communication device registered as being accommodated in the network becomes inaccessible to the network, the network system that can shorten the period during which registration information relating to the communication device remains on the network side, An information registration method, a communication device, and a communication program are desired.

  A network system according to a first aspect of the present invention includes: (1) a communication apparatus accommodated in a network; and an information registration apparatus that registers communication apparatus information related to the communication apparatus while the communication apparatus is accommodated in the network. (2) When registering or updating communication device information in the information registration device, the network system includes information registration means for calculating and applying a registration expiration date of the communication device information.

  The information registration method of the second aspect of the present invention includes: (1) a communication device accommodated in a network and an information registration device for registering communication device information related to the communication device while accommodating the communication device in the network. In an information registration method for registering communication device information in the information registration device in a network system comprising: (2) information registration means; (3) the information registration means sends communication device information to the information registration device. When registering or updating, a registration expiration date of the communication device information is calculated and applied.

  The communication device of the third aspect of the present invention is (1) a communication device accommodated in a network, and (2) information for registering communication device information relating to the communication device while accommodating the communication device in the network. An information transmission unit is provided that calculates and applies an expiration date of the communication device information when the registration device is given and registered with the communication device information related to the communication device.

  A communication program according to a fourth aspect of the present invention includes (1) a computer installed in a communication device accommodated in a network, and (2) communication device information relating to the communication device while the communication device is accommodated in the network. When an information registration device for registering information is registered by giving communication device information related to the communication device, the information registration device functions as an information transmission unit that calculates and applies an expiration date of the communication device information.

  According to the present invention, when a communication device registered as being accommodated in a network becomes inaccessible to the network, it is possible to shorten a period during which registration information relating to the communication device remains on the network side.

(A) Main Embodiment Hereinafter, an embodiment of a network system, an information registration method, a communication device, and a communication program according to the present invention will be described in detail with reference to the drawings. Note that the communication device in this embodiment is a VCC terminal.

(A-1) Configuration of Embodiment FIG. 1 is a block diagram showing an overall configuration of a network system 1 of this embodiment.

  In the network system 1, it is assumed that the VCC terminal 10 that is a wireless communication terminal that can be accommodated in both the CS network 20 and the IMS network 30 is accommodated in either the CS network 20 or the IMS network 30. In FIG. 1, when the VCC terminal 10 can access both the CS network 20 and the IMS network 30 depending on its location, the VCC terminal 10 preferentially accommodates the IMS network 30. Further, when the VCC terminal 10 can access only one of the CS network 20 and the IMS network 30 depending on its position, it is assumed that the VCC terminal 10 is accommodated in the accessible network.

  A CS network radio base station 21 is arranged in the CS network 20. In FIG. 1, only one CS network radio base station 21 is arranged in the CS network 20, but the number of CS network radio base stations 21 arranged may be plural and not limited. In addition, although illustration is omitted in FIG. 1 for simplicity of explanation, it is assumed that the CS network 20 has a configuration necessary for the CS network 20 such as an exchange device and a transmission device. As the CS network 20, for example, an existing CS network such as an existing communication network for mobile phone terminals can be applied.

  The CS network radio base station 21 is a device for performing radio communication with the VCC terminal 10 and connecting the VCC terminal 10 to the CS network 20. For example, a base station in a communication network for an existing mobile phone terminal can be applied to the CS network radio base station 21.

  In the IMS network 30, an IMS network wireless access point (hereinafter referred to as “IMS wireless AP”) 31, a call processing server 32, a data server 33, and a VCC server 34 are arranged.

  In FIG. 1, only one VCC server 34, call processing server 32, and IMS network wireless AP 31 are arranged, but the number thereof may be plural and is not limited. Although the illustration is omitted in FIG. 1 for the sake of simplicity, the IMS network 30 has other configurations necessary for the IMS network 30 such as a network device such as a router or a switch. Shall. As the IMS network 30, for example, an existing IMS network such as a communication network using an existing SIP can be applied.

  The IMS network wireless AP 31 is a device for performing wireless communication with the VCC terminal 10 and accommodating the VCC terminal 10 in the IMS network 30 in the IMS network 30. For example, a wireless access point used in the existing IMS network 30 such as an existing wireless LAN access point can be applied to the IMS network wireless AP 31.

  The call processing server 32 is a device responsible for processing related to call control using SIP for communication within the IMS network 30. For example, a call control device used in an existing IMS network can be applied to the call processing server 32.

  The VCC server 34 has a function of performing control when the VCC terminal 10 performs network switching between the CS network 20 and the IMS network 30, and an existing VCC server can be applied.

  The data server 33 has a function of storing and holding information related to network control in the IMS network 30 and registers at least accommodation terminal information of the VCC terminals 10 accommodated in the IMS network 30. As the data server 33, the same database device as that arranged on the existing IMS network can be applied. In addition, the processing similar to that of the existing IMS network can be applied to the processing of the accommodation terminal information format and registration / deletion / update in the IMS network 30. In addition, as accommodation terminal information, you may make it include information, such as identification information (for example, IP address, a transmission number, etc.) of a VCC terminal, location registration information, etc., for example.

  In FIG. 1, it is assumed that the IMS terminal 30 accommodates a communication terminal 11 as a communication terminal of a communication partner of the VCC terminal 10. The communication terminal 11 communicates with the VCC terminal 10 using SIP. The communication terminal 11 can be a communication terminal in an existing IMS network.

  A gateway device (hereinafter referred to as “GW device”) 40 is a gateway device for causing communication between the CS network 20 and the IMS network 30. As the GW device 40, a gateway device arranged between the existing CS network and the IMS network can be applied.

  The VCC terminal 10 includes a wireless processing unit 101, a communication processing unit 102, and an arithmetic processing unit 103. Although not shown in FIG. 1, the VCC terminal 10 also has other configurations such as a push button and a microphone / speaker that an existing wireless communication terminal (for example, a mobile phone terminal) has. Yes. Here, the VCC terminal 10 includes, for example, a CPU, a ROM, a RAM, and the like for executing communication processing, data processing, and the like in addition to a hardware communication unit, a microphone, a speaker, and the like. A program to be executed (including the “communication program” in the embodiment) is installed. FIG. 1 shows the functional configuration of the VCC terminal 10 including the above-described program.

  The wireless processing unit 101 has a function of transmitting / receiving a wireless signal to / from another communication device. Further, the wireless processing unit 101 measures the reception intensity of the radio wave received from the IMS network wireless AP 31 (hereinafter referred to as “radio wave reception intensity”), and registers the measured radio wave reception intensity value in the radio wave reception intensity holding unit 104. To do.

  The radio wave reception intensity holding unit 104 is a unit that stores and holds the latest radio wave reception intensity value measured by the radio processing unit 101.

  The communication processing unit 102 has a function of generating a SIP signal (for example, a REGISTER message). The communication processing unit 102 generates a REGISTER message for registering its own accommodation terminal information in the data server 33. In addition, the communication processing unit 102 applies the expiration date calculated latest by the arithmetic processing unit 103 as the expiration date (for example, EXPIRE parameter in the REGISTER message) set in the accommodation terminal information to be inserted into the REGISTER message.

  Further, the communication processing unit 102 updates the counter value of the registration number counter 105. For example, in this embodiment, when the transmission of the REGISTER message is successful, the counter value of the registration count counter 105 is incremented by 1, and when the transmission of the REGISTER message fails, the counter value of the register value is decremented by 1. It shall be. The initial value of the counter value in the registration number counter 105 may be “0”. In addition, for example, when the VCC terminal 10 transmits a REGISTER message to delete its own accommodation terminal information to the call processing server 32, or the expiration date set in the accommodation terminal information transmitted by the latest REGISTER message. When elapses, the counter value of the registration number counter 105 may be reset to “0”. The case where the transmission of the REGISTER message is successful refers to, for example, a case where the REGISTER message is transmitted and an acknowledgment (OK) is received from the call processing server 32.

  The arithmetic processing unit 103 has a function of calculating the expiration date set in the accommodation terminal information to be inserted into the REGISTER message in the communication processing unit 102.

  In this embodiment, for example, the arithmetic processing unit 103 is based on the latest measured radio wave reception intensity value held in the radio wave reception intensity holding unit 104 and the counter value held in the registration number counter 105. The expiration date set in the accommodation terminal information is calculated.

  The arithmetic processing unit 103 may calculate the expiration date according to the following equation (1), for example. In equation (1), “T” is the current time, and “X” is the latest measured radio wave reception intensity value held in the radio wave reception intensity holding unit 104. “Y” is a counter value held in the registration number counter 105. “K” is a coefficient for calculating the expiration date based on the radio wave reception intensity X, and an arbitrary value may be set in advance. “J” is a coefficient for calculating the expiration date based on the counter value Y, and an arbitrary value may be set in advance.

Expiration date = T + Xk + Yj (1)
(A-2) Operation of Embodiment Next, the operation (information registration method of the embodiment) of the network system 1 of this embodiment having the above configuration will be described. First, after describing the operation of the IMS network 30, the detailed operation for calculating the expiration date in the VCC terminal 10 will be described.

(A-2-1) Operation of IMS Network 30 FIG. 2 is a sequence diagram illustrating an operation in which accommodated terminal information related to the VCC terminal 10 is registered and updated by the VCC terminal 10 in the IMS network 30.

  First, when the VCC terminal 10 enters the area of the IMS network 30 where the radio waves of the IMS network AP 31 reach, the VCC terminal 10 calculates the expiration date set in the accommodation terminal information, and the accommodation terminal information of the expiration date is calculated. The inserted REGISTER message is generated and transmitted to the IMS network 30 (data server 33), and the accommodation terminal information is registered in the IMS network 30 (data server 33) (S101).

  Then, before the expiration date set in step S101 expires, the VCC terminal 10 similarly calculates the expiration date, generates a REGISTER message in which the accommodation terminal information of the expiration date is inserted, and generates the IMS network 30 (data server 33), the accommodated terminal information set with a new expiration date is registered in the IMS network 30 (data server 33), and the expiration date is updated (S102).

  FIG. 3 is a sequence diagram showing the operation of the IMS network 30 when the VCC terminal 10 moves to an area where radio waves do not reach the IMS network wireless AP 31 within the validity period of the registration related to the VCC terminal 10. It is.

  First, in the VCC terminal 10, the expiration date set in the accommodation terminal information is calculated, a REGISTER message in which the accommodation terminal information of the expiration date is inserted is generated, transmitted to the IMS network 30 (data server 33), and Assume that the accommodation terminal information is registered in the IMS network 30 (data server 33) (S201). Then, after the process of step S201, it is assumed that the VCC terminal 10 has moved to an area where radio waves do not reach the IMS network wireless AP 31.

  Next, it is assumed that an INVITE message is sent from the communication terminal 11 to the call processing server 32 in order to access the VCC terminal 10 (S202).

  When the INVITE message is received from the communication terminal 11, the call processing server 32 acquires information related to the VCC terminal 10 from the data server 33 (S 203), and sends out an INVITE message for accessing the VCC terminal 10. However, as described above, since the VCC terminal 10 has moved to an area where radio waves do not reach the IMS network wireless AP 31, there is no response, and the call processing server 32 resends the INVITE message to the VCC terminal 10. However, after repeated attempts until timeout (S204), the call processing server 32 returns a message (408 Request Timeout) indicating that timeout has occurred to the communication terminal 11 (S205).

  FIG. 4 is a sequence diagram showing the operation of the IMS network 30 when there is an incoming call addressed to the VCC terminal 10 after the expiration date of registration related to the VCC terminal 10.

  First, in the VCC terminal 10, an expiration date set in the accommodation terminal information is calculated, a REGISTER message in which the accommodation terminal information of the expiration date is inserted is generated, transmitted to the IMS network 30 (data server 33), and the accommodation It is assumed that the terminal information is registered in the IMS network 30 (data server 33) (S301). Then, it is assumed that the expiration date of the registration information related to the VCC terminal 10 has elapsed after the process of step S301.

  Next, it is assumed that an INVITE message is transmitted from the communication terminal 11 (see FIG. 4) to the call processing server 32 in order to access the VCC terminal 10 (S302).

  When the INVITE message is received from the communication terminal 11, the call processing server 32 tries to acquire information related to the VCC terminal 10 from the data server 33, but as described above, the expiration date of the registration information related to the VCC terminal 10 is Since it has expired, the registration information related to the VCC terminal 10 is already invalid in the data server 33 and cannot be acquired (S303).

Then, since the call processing server 32 cannot acquire the registration information related to the VCC terminal 10, a message indicating that it cannot be used (480 Temporarily Unavailable) is returned to the communication terminal 11 (S 304).
(A-2-2) Operation of Expiration Date Calculation in VCC Terminal 10 Next, in the VCC terminal 10, the operation of calculating the expiration date and generating / transmitting a REGISTER message with the accommodated terminal information of the expiration date inserted. explain.

  FIG. 5 is a flowchart illustrating an operation of measuring the reception intensity of the radio wave received from the IMS network wireless AP 31 by the wireless processing unit 11.

  First, the radio processing unit 11 measures and calculates the intensity value of the radio wave received from the IMS network AP 31 (S401), and the latest radio wave reception intensity value is held in the radio wave reception intensity holding unit 104 (S402). Further, returning to step S401, measurement, calculation, and holding of the value of the radio wave reception intensity are repeated.

  FIG. 6 is a flowchart illustrating an operation of calculating an expiration date and sending a REGISTER message in the VCC terminal 10.

  The communication processing unit 12 acquires the latest value of the radio wave reception intensity held by the radio wave reception intensity holding unit 104 (S501), and determines whether it is less than the threshold (S502). The threshold value in step S501 may be a value sufficient to start communication between the VCC terminal 10 and the IMS network wireless AP 31, for example.

  In step S502 described above, when it is determined that the latest radio wave reception strength value held by the radio wave reception strength holding unit 104 is less than the threshold value, the processing starts from the process in step S501 described above, and is greater than or equal to the threshold value. In that case, the operation starts from the processing of step S504 described later (S503).

  If it is determined in step S503 described above that the latest radio wave reception intensity value held by the radio wave reception intensity holding unit 104 is equal to or greater than the threshold value, the arithmetic processing unit 103 performs the radio wave reception intensity holding unit 104 and the number of registrations. Based on the counter value of the counter 105, the expiration date is calculated by the above equation (1) (S504).

  When the expiration date is calculated in step S504 described above, the communication processing unit 102 generates accommodation terminal information with the calculated expiration date, and further generates a REGISTER message in which the accommodation terminal information is inserted. 32 (data server 33) is sent (S505).

  If transmission of the REGISTER message is successful in step S505, 1 is added to the counter value of the registration count counter 105, and if it is unsuccessful, 1 is subtracted (S506).

  When the processing in step S506 is completed, the communication processing unit 102 and the arithmetic processing unit 103 wait until the expiration date of the accommodation terminal information inserted in the REGISTER message that has been successfully transmitted by the processing in step S505 described above (S507). ), The operation starts again from step S504 described above.

(A-3) Effects of Embodiment According to this embodiment, the following effects can be achieved.

  In the VCC terminal 10, for example, the expiration date set in the accommodation terminal information is calculated based on parameters such as the radio wave reception intensity and the counter value of the registration number counter 105, and the accommodation terminal information in which the expiration date is set is stored in the IMS network. 30 (data server 33). Thereby, the expiration date set in the accommodation terminal information in the IMS network 30 is not based on a fixed effective period, but based on parameters such as the radio wave reception intensity and the counter value of the registration count counter 105, for example, An appropriate expiration date can be set. Thereby, it is possible to shorten the time during which the accommodated terminal information of the VCC terminal 10 remains registered in the IMS network 30 even though the VCC terminal 10 has moved to an area where the IMS network 30 cannot be accessed. it can.

  In addition, the VCC terminal 10 calculates an appropriate expiration date based on parameters such as radio wave reception intensity and sets it in the accommodation terminal information. For example, the expiration date is simply set based on a short effective period. Since the frequency of updating the accommodation terminal information (for example, transmission / reception of REGISTER messages) can be reduced as compared with the case where it is performed, the processing amount and communication amount required on the network system 1 can be reduced.

  Furthermore, the VCC terminal 10 uses the radio wave reception intensity as one of the expiration date calculation parameters set in the accommodation terminal information. For example, the VCC terminal 10 is connected to the IMS network 30 as the measured radio wave reception intensity decreases. It is inferred that the location is closer to the boundary between the accessible area and the inaccessible area. That is, it is considered that the lower the radio wave reception intensity measured, the higher the probability that the VCC terminal 10 will move to an area where the IMS network 30 cannot be accessed. In such a case, the expiration date set in the accommodation terminal information When the VCC terminal 10 has moved to an area where the IMS network 30 cannot be accessed, the expiration date set in the accommodation terminal information is set shorter. Thereby, it is possible to shorten the time during which the accommodated terminal information of the VCC terminal 10 remains registered in the IMS network 30 even though the VCC terminal 10 has moved to an area where the IMS network 30 cannot be accessed. it can.

  Furthermore, although the counter value of the registration number counter 105 is one of the expiration date calculation parameters set in the accommodation terminal information, for example, the VCC terminal 10 continuously enters the IMS network 30 as the counter value increases. It means that the time spent in the accessible area is long, and it is highly likely that it will remain in the area accessible to the IMS network 30 in the future as well. Conversely, the smaller the counter value, the shorter the time during which the VCC terminal 10 stays in the area where the IMS network 30 can be continuously accessed, and the probability that the VCC terminal 10 will move to an area where the IMS network 30 cannot be accessed. This is considered to be higher than when the time staying in the area is longer. As described above, the smaller the counter value is, the shorter the expiration date set in the accommodation terminal information is set, so that the VCC terminal 10 is set in the accommodation terminal information when the VCC terminal 10 moves to an area where the IMS network 30 cannot be accessed. Set expiration date shorter. Thereby, it is possible to shorten the time during which the accommodated terminal information of the VCC terminal 10 remains registered in the IMS network 30 even though the VCC terminal 10 has moved to an area where the IMS network 30 cannot be accessed. it can.

  Further, in this embodiment, a long-term VCC terminal can be used for a long period of time even when the value of the radio wave reception intensity is small by using the two parameters of the radio wave reception intensity and the counter value of the registration number counter 105 and calculating the expiration date. 10 can remain in an area where the IMS network 30 can be accessed continuously, the expiration date can be set longer, and the update frequency of the accommodation terminal information (for example, transmission / reception of REGISTER messages) can be further reduced. Therefore, it is possible to reduce the amount of processing and communication required on the network system 1.

(B) Other Embodiments The present invention is not limited to the above-described embodiments, and may include modified embodiments as exemplified below.

(B-1) In the above embodiment, the expiration date set in the accommodation terminal information is calculated on the VCC terminal 10 side, but is not limited to calculating the expiration date on the VCC terminal 10 side. The IMS network 30 side may be provided with means for calculating the expiration date and setting it in the accommodation terminal information.

  For example, when the REGISTER message for registering the accommodation terminal information transmitted from the VCC terminal 10 is received in the call processing server 32 or the data server 33, the radio wave received from the VCC terminal 10 is transmitted to the IMS network wireless AP 31. You may make it inquire about receiving strength and calculate an expiration date based on the receiving strength. Further, for example, a means corresponding to the registration number counter 105 is provided on the IMS network 30 side, and the counter value is updated every time the accommodation terminal information related to the VCC terminal 10 is updated, and the expiration date is based on the counter value. May be calculated.

(B-2) In the above embodiment, the arithmetic processing unit 103 uses the above equation (1) to determine the latest measured radio wave reception intensity value stored in the radio wave reception intensity holding unit 104 and the number of registrations. The expiration date set in the accommodation terminal information is calculated based on the counter value held in the counter 105, but the method for calculating the expiration date is not limited to this.

  For example, it may be calculated based only on the latest measured radio wave reception intensity value held in the radio wave reception intensity holding unit 104 or may be calculated only based on the counter value held in the registration number counter 105. May be. The expiration date may be calculated based on parameters other than the radio wave reception intensity and the counter value. The expiration date may be calculated by combining a plurality of parameters as described above.

  For example, an error rate in communication between the VCC terminal 10 and the IMS network wireless AP 31 may be applied as a parameter for calculating the expiration date. For example, the expiration date may be set longer as the error rate is lower. Even when the radio wave reception intensity is high, setting the expiration date according to the error rate is preferable when the communication quality is poor due to surrounding radio waves or the like. As a means for acquiring the error rate, for example, when the VCC terminal 10 or the IMS network wireless AP 31 includes a database based on MIB (Management Information Base), a value indicating the number of transmission or reception errors in the MIB is used. Alternatively, a means for measuring the error rate may be arranged in the VCC terminal 10 or the IMS network wireless AP 31 separately. Note that the error rate may be calculated in bit units or packet units, and the calculation method is not limited.

  Further, for example, throughput (effective transfer amount per unit time) in communication between the VCC terminal 10 and the IMS network wireless AP 31 may be applied as a parameter for calculating an expiration date. For example, the expiration date may be set longer as the throughput is higher. As a means for obtaining the throughput, for example, when the VCC terminal 10 or the IMS network wireless AP 31 includes a database by MIB, a value indicating the amount of transmission or reception in the MIB may be used. Alternatively, a means for measuring the throughput may be arranged in the VCC terminal 10 or the IMS network wireless AP 31 separately.

  Further, for example, in the above embodiment, the expiration date is calculated based on the counter value held in the registration number counter 105, but the VCC terminal 10 does not use the counter value but the IMS terminal 30 (the IMS network wireless). The time continuously stored in the AP 31) may be applied as a parameter for calculating the expiration date. For example, the expiration date may be set longer as the time during which the VCC terminal 10 is continuously accommodated in the IMS network 30 (IMS network wireless AP 31) is longer.

  Further, for example, the current time may be applied as a parameter for calculating the expiration date. For example, if the user of the VCC terminal 10 is predicted to have a low probability of moving while sleeping or the like in a time zone in which the current time is nighttime (for example, 22: 00 to 4:00), the night time For example, the expiration date calculated in the time zone is set longer than the expiration date calculated in other time zones, and the expiration date is calculated according to the time zone of the current time.

(B-3) In the above embodiment, the arithmetic processing unit 103 calculates the expiration date based on the expression (1), but the expiration date becomes longer as the values of X and Y are larger. If calculated, the content of the calculation formula is not limited. For example, the following equation (2) may be applied in the arithmetic processing unit 103.

Expiration date = T + (Xk · Yj) (2)
(B-4) In the above embodiment, the arithmetic processing unit 103 uses the counter value of the registration number counter 105 as one parameter for calculating the expiration date, and the counter value of the registration number counter 105 is successfully transmitted as a REGISTER message. In this case, 1 is added, and in the case of failure, 1 is subtracted. However, it may be replaced with another parameter corresponding to the history of updating the accommodation terminal information. For example, the counter value of the registration number counter 105 may be incremented by 1 when the transmission of the REGISTER message is successful, and may not be decremented by 1 even when the transmission fails. Further, for example, the counter value of the registration number counter 105 is not reset to “0” at the timing when the accommodation terminal information becomes invalid, but is set to “0” at regular timing (for example, every other hour). It may be reset, or the number of updates for a certain past time (for example, the past one hour) may be held and the number of updates may be applied as a parameter for calculating the expiration date.

(B-5) In the above embodiment, the network system 1 has the CS network 20 and the IMS network 30, and the VCC terminal 10 has been described as moving between the two networks. You may make it replace with a 2nd IMS network. At this time, the second IMS network can be the same as the IMS network 30. In the above network, the CS network 20 and the IMS network 30 are arranged in the network system 1. However, only one network of the IMS network 30 may be arranged, and the number of arranged networks. The combinations are not limited.

(B-6) In the above-described embodiment, the VCC terminal 10 accommodated in the CS network 20 or the IMS network 30 has been described as a communication terminal compatible with VCC, but may be replaced with a communication terminal not compatible with VCC. Well, the type is not limited.

  In the above embodiment, the VCC terminal 10 has been described as a wireless communication terminal, but may be replaced with a wired communication terminal. When a wired communication terminal is applied, an expiration date set in the accommodation terminal information may be set using a parameter other than the radio wave reception intensity.

(B-7) In the above embodiment, the case where the present invention is applied to the IMS network 30 has been described. However, the applied network is not limited to the IMS network. The IMS network 30 may be replaced with, for example, another type of network that performs communication using SIP other than the IMS network. Further, the IMS network 30 is connected to, for example, H.264. It may be replaced with a network using a protocol other than SIP, such as H.323. As in the network system 1 of the above-described embodiment, if the network includes means for setting accommodation terminal information with an expiration date, the network type to which the present invention is applied is a network that communicates using an IMS network or SIP. It is not limited to.

(B-8) In the above embodiment, it has been described that the VCC terminal 10 is accommodated in the IMS network 30. However, only voice communication terminals such as the VCC terminal 10 are accommodated in the IMS network 30. Instead, it may be replaced with a communication device that performs data communication other than voice, and the type of data to be communicated is not limited. In the above-described embodiment, the VCC terminal 10 may be replaced with a communication device (for example, a network device such as a router or a switch) that further connects another communication terminal.

It is the block diagram shown about the whole network system structure of embodiment. It is the sequence diagram shown about the operation | movement by which the expiration date of registration which concerns on a VCC terminal is registered and extended by the VCC terminal in the IMS network of embodiment. It is the sequence diagram shown about the operation | movement of an IMS network when a VCC terminal has moved to the area where a radio wave does not reach IMS network radio | wireless AP within the expiration date of registration concerning the VCC terminal of embodiment. It is the sequence diagram shown about the operation | movement of an IMS network when there exists the incoming call destined for a VCC terminal after the registration expiration date which concerns on the VCC terminal of embodiment. 6 is a flowchart illustrating an operation of measuring the reception intensity of a radio wave received from an IMS network wireless AP by a wireless processing unit in a VCC terminal according to an implementation mobile phone. It is the flowchart explaining the operation | movement which calculates an expiration date and sends a REGISTER message in the VCC terminal which concerns on embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Network system, 10 ... VCC terminal, 101 ... Wireless processing part, 102 ... Communication processing part, 103 ... Arithmetic processing part, 104 ... Radio wave reception intensity holding part, 105 ... Registration frequency counter, 11 ... Communication terminal, 20 ... CS Network, 21 ... CS network wireless base station, 30 ... IMS network, 31 ... IMS network wireless AP, 32 ... call processing server, 33 ... data server, 34 ... VCC server, 40 ... GW device.

Claims (6)

In a network system comprising a communication device accommodated in a network and an information registration device that registers communication device information related to the communication device while accommodating the communication device in the network,
A network system comprising information registration means for calculating and applying a registration expiration date of communication device information when registering or updating communication device information in the information registration device. A housing device for housing the communication device in the network;
Radio wave reception intensity measuring means for measuring the reception intensity of the radio wave received by the communication device from the accommodation device or the reception intensity of the radio wave received by the accommodation device from the communication device;
The network system according to claim 1, wherein the information registration unit calculates a registration expiration date applied to the communication device information based on at least the reception intensity measured by the radio wave reception intensity measurement unit. The information registration device further includes history information holding means for holding history information related to an update history of the communication device information of the communication device,
The network according to claim 1 or 2, wherein the information registration unit calculates a registration expiration date applied to the communication device information based on at least the history information held by the history information holding unit. system. A communication device in a network system comprising: a communication device accommodated in a network; and an information registration device that registers communication device information related to the communication device while the communication device is accommodated in the network. In the information registration method for registering information,
With information registration means,
The information registration method, wherein when registering or updating communication device information in the information registration device, the registration time limit of the communication device information is calculated and applied. In a communication device accommodated in a network,
While accommodating the communication device in the network, when the information registration device for registering the communication device information related to the communication device is given and registered with the communication device information related to the communication device, A communication apparatus comprising: an information transmission unit that calculates and applies an expiration date. A computer installed in a communication device accommodated in the network
While the communication device is accommodated in the network, when the information registration device that registers the communication device information related to the communication device is given and registered with the communication device information related to the communication device, A communication program that functions as an information transmission unit that calculates and applies an expiration date.

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