JP4417206B2 - Communication monitoring system and communication monitoring method - Google Patents

Description

  The present invention relates to a communication monitoring system and a communication monitoring method, and more particularly to a communication monitoring system and a communication monitoring method for realizing communication monitoring with a communication monitoring apparatus that centrally deploys a communication monitoring function separately from an exchange that performs data processing.

A case of monitoring a communication path used for packet communication will be described with reference to FIG. In the figure, the terminal device 11 and the terminal device 14 communicate with each other via the exchange 22, the IP network 100, and the exchange 23. In this state, it is necessary to perform the following control to change the route in order to perform communication monitoring.
(1) A command is input from the monitor receiving device 31 in order to confirm the data communication path to the terminal device 14 subordinate to the monitoring target exchange (here, the exchange 23).
(2) Data communication path information such as an IP address is transmitted from the exchange 23 to the monitor receiver 31.
(3) The monitor receiver 31 requests the exchange 23 in which the data communication path is accommodated to start the communication monitor function.

  By performing the above control, data transmitted from the exchange 22 to the exchange 23 is input to the monitor receiving device 31 via the communication monitoring device. That is, the packet was sent from the exchange 22 to the exchange 23 via the IP network 100 before the start of the communication monitor, whereas after the start of the communication monitor, the communication was made from the IP network 100 as shown in FIG. A packet is sent to the monitor device 32. Therefore, as shown in FIG. 9, when the communication monitoring device 32 performs multipath connection, the packets P <b> 2 ′ are also sent to the monitor receiving device 31. Thereby, in the monitor receiver 31, a communication monitor can be realized.

By the way, switching of communication paths without interruption when a failure occurs is described in Patent Document 1. Japanese Patent Application Laid-Open No. H10-228561 describes a technique for eliminating the influence on main signal data due to path switching timing.
JP 2000-327771 A

When the communication monitor is performed as described above, the bidirectional communication path between the exchange 22 and the exchange 23 is switched to the path from the exchange 22 to the communication monitor device 32 and the path from the exchange 23 to the communication monitor device 32. Immediately after, a blank time occurs. This blank time occurs in each bidirectional communication.
As shown in FIG. 8, the packet P1 is sent from the exchange 22 to the exchange 23 as it is. On the other hand, the subsequent packets P2, P3,... Are sent from the exchange 22 to the exchange 23 through a path via the communication monitor device 32.

At this time, after the packet transmission interval T0 seconds, the packet P2 should have arrived at the exchange 23, but has not yet arrived because it passes through the communication monitor device 32. Therefore, the terminal device under the exchange 23 hears silence, and this quality degradation becomes a problem. Such a problem cannot be solved by the technique described in Patent Document 1.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a communication monitoring system that can perform communication monitoring without causing communication quality deterioration.

A communication monitoring system according to claim 1 of the present invention is a communication monitoring system for monitoring data transmitted and received via a communication path, and includes a silent detection means for detecting a silent portion of the data, and a silent detection means by the silent detection means. Address change means for changing the destination address of the data to an address via the communication monitor device in response to the detection of the portion, in the communication monitor device, by changing the address by the address change means The data is monitored through the switched communication path. In response to the detection of the silent portion, the data destination address is changed to an address that passes through the communication monitoring device, so that the communication monitoring device monitors the data through the communication path switched by the address change. In addition, there is no delay in packet data due to path switching, and quality does not deteriorate. Also, by converting the destination address of the data into a multicast address including the address of the communication monitoring device using the acquired call information, the communication monitoring device can monitor the data transmitted by multicast.
According to a second aspect of the present invention, there is provided a communication monitor system for monitoring data exchanged via a communication path, wherein the silent monitor means for detecting a silent portion of the data to be monitored, and the silent First address conversion means for converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent part by the detection means, and the data to be monitored pass Call information acquisition means for acquiring call information related to a node; handover notification information acquisition means for acquiring information notified in response to a handover of a mobile terminal that receives the data to be monitored; and handover notification information acquisition Data to be monitored in accordance with information notified by the means upon handover of the mobile terminal. And a third address translation unit that translates the destination address into a new multicast address. In the communication monitoring device, the communication is switched by the translation of the address by the first address translation unit during the silent portion. Monitoring the data to be monitored via a path, and continuing to monitor the data to be monitored that is multicast transmitted by address translation by the third address translation means at the time of handover of the mobile terminal Features. Even if the mobile terminal is located in a different area due to the handover during the communication monitoring, the data destination address is changed to the new multicast according to the information notified from the mobile terminal along with the handover. The communication monitor can be continued by converting the address.

The communication monitor system according to claim 3 of the present invention is the communication monitor system according to claim 1 or 2 , wherein the silence detecting means compares a predefined silence pattern with a pattern included in data transmitted and received via a communication path. By doing so, a silent part is detected. By doing so, it is possible to easily determine whether or not a predefined silence pattern is included in the data.

According to a fourth aspect of the present invention, the communication monitoring system according to any one of the first to third aspects maintains the data reception order before and after the switching of the communication path based on the sequence number assigned to the data. It is further characterized by further comprising means for controlling as described above. In this way, data waiting processing can be performed, and the data reception order can be maintained.

A communication monitoring method according to claim 5 of the present invention is a communication monitoring method for monitoring data exchanged via a communication path, wherein a silence detecting step for detecting a silent portion of data to be monitored, and the silence detecting step. A first address conversion step of converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent part by the method, and a node through which the data to be monitored passes A call information acquisition step for acquiring call information, a handover notification information acquisition step for acquiring information notified in response to a handover of a mobile terminal receiving the data to be monitored, and the handover notification information acquisition step. Responding to acquisition of information notified in response to handover of the mobile terminal. And a second address conversion step of converting the destination address of the data to be monitored into a multicast address including the address of the communication monitor device. In the communication monitor device, the first address at the time of the silent portion. The data to be monitored is monitored via the communication path switched by the address conversion in the address conversion step, and multicast transmission is performed by the address conversion in the second address conversion step at the time of handover of the mobile terminal. The monitoring of the data to be monitored is continued . In response to the detection of the silent portion, the data destination address is changed to an address that passes through the communication monitoring device, so that the communication monitoring device monitors the data through the communication path switched by the address change. In addition, there is no delay in packet data due to path switching, and quality does not deteriorate. Also, by converting the destination address of the data into a multicast address including the address of the communication monitoring device using the acquired call information, the communication monitoring device can monitor the data transmitted by multicast.

A communication monitoring method according to claim 6 of the present invention is a communication monitoring method for monitoring data exchanged via a communication path, wherein a silence detecting step for detecting a silent portion of data to be monitored, and the silence detecting step. A first address conversion step of converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent part by the method, and a node through which the data to be monitored passes A call information acquisition step for acquiring call information, a handover notification information acquisition step for acquiring information notified in response to a handover of a mobile terminal receiving the data to be monitored, and the handover notification information acquisition step. The monitor according to information notified along with handover of the mobile terminal And a third address conversion step of converting the destination address of the data to be converted into a new multicast address. In the communication monitoring device, the address is switched by the address conversion in the first address conversion step at the silent portion. The data to be monitored is monitored through the communication path, and the monitoring of the data to be monitored that is multicast transmitted by the address translation in the third address translation step at the time of handover of the mobile terminal is continued. It is characterized by that . Even if the mobile terminal is located in a different area due to the handover during the communication monitoring, the data destination address is changed to the new multicast according to the information notified from the mobile terminal along with the handover. The communication monitor can be continued by converting the address.

  As described above, the present invention detects a silent portion of data, and in response to the detection, changes the destination address of the data to an address via the communication monitor device. The data can be monitored via the communication path switched by changing the address, and the packet data is not delayed by the path switching, and the quality is not deteriorated.

  Further, when monitoring data transmitted to a mobile terminal, call information regarding a node through which data to be monitored passes is acquired, and the destination address of the data is included using the acquired call information, including the address of the communication monitoring device. By converting to a multicast address, the communication monitoring device can monitor the data transmitted by multicast.

  Furthermore, even if the mobile terminal is located in a different area due to the handover during the communication monitoring, the data destination address is newly set according to the information notified from the mobile terminal along with the handover. By converting to a valid multicast address, there is an effect that communication monitoring can be continued.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same parts as those in the other drawings are denoted by the same reference numerals.
Here, after detecting the silent part of data and switching the path using the part, switching the path using the multicast function, respectively, the handover in the case of monitoring the path to the mobile terminal Mention the response to.

1. When a silent part is used By detecting a silent part of data in the exchange on the transmission side and switching a path in the silent part, it is possible to smoothly switch while maintaining communication quality.
A specific configuration will be described with reference to FIG. In the figure, a configuration example in which packet data is transmitted / received via the IP network 100 by the exchange 22 on the transmission side, the exchange 23 on the reception side, the communication monitor device 32, and the monitor reception device 31 is shown. ing.

  The exchange 22 on the transmission side includes an input interface (IF) 221 for inputting data, a buffer 222 for temporarily storing data, an output interface 223 for outputting data, and a control unit for controlling each unit 224, a subscriber information table 225, and a silent pattern high-speed detection circuit 226 for detecting a silent portion of data.

As shown in FIG. 2, the subscriber information table 225 includes items of “basic contract number (terminal number)”, “destination address (next node)”, “service type”, and “monitor flag”. Has been.
The “basic contract number (terminal number)” stores, for example, a telephone number “090-xxxx-xxxx” used in a mobile phone. For example, an IP address and a UDP port number are stored in the “destination address (next node)”. In “service type”, for example, information indicating “voice” is stored. For example, information indicating “monitoring” is stored in the “monitor flag”.

  The silent pattern high-speed detection circuit 226 includes a memory (not shown) and a comparison circuit. When a sound silence pattern is clear (for example, FF... F), this pattern is stored in advance in the memory. Then, the silent portion is detected by comparing the stored pattern with the data pattern stored in the buffer. More specifically, the comparison circuit compares whether or not the data pattern of the first packet stored in the buffer 222 matches the pattern stored in the memory. As a result of this comparison, if both match, a silent portion has been detected.

  The communication monitoring device 32 includes an input interface 321 for inputting data, a buffer 322 for temporarily storing data, an output interface 323 for outputting data, a control unit 324 for controlling each unit, a packet A copy unit 325 for copying data and an output interface 326 for outputting data to the monitor receiver 31 are configured.

The exchange 23 on the receiving side includes an input interface 231 for inputting data, a buffer 232 for temporarily storing data, an output interface 233 for outputting data, a control unit 234 for controlling each unit, The subscriber information table 235 is included.
In such a configuration, the transmission / reception packet is determined to be silent / sound, and the path is switched when there is no sound. In this example, the switch 22 detects the silence pattern of each packet and switches the path. As a result, paths can be switched smoothly while maintaining communication quality.

A procedure for performing the path switching process as described above will be described with reference to FIGS.
In FIG. 1, first, the following processing is performed.
(1-1) The monitor receiving device 31 transmits a monitor activation request including path information to be monitored to the transmission-side exchange 22 and the reception-side exchange 23.
(1-2) Next, a monitor activation response is returned to the communication monitor device 32 from the transmission side exchange 22 and the reception side exchange 23, and a monitor activation response is returned to the monitor reception device 31.
(1-3) After the setting of the path via the communication monitor device 32 is completed, immediately after the transmission data of the silent pattern is sent from the transmission-side exchange 22, the path is switched and the communication data is transmitted to the communication monitor device 32. .

(Control in the transmission side exchange)
Control within the exchange 22 on the transmission side will be described with reference to FIG. In the exchange 22 on the transmission side, the following processing is performed between the processing (1-1) and the processing (1-2).
(2-1) The monitor receiving device 31 transmits a monitor activation request including information on a path to be monitored to the transmission-side exchange 22 (S11).
(2-2) The control unit 224 in the transmission-side exchange 22 that has received the monitor activation request accesses the subscriber information table 225, searches for the corresponding destination address information, and specifies the corresponding path (S12).

(2-3) The subscriber information table 225 returns the destination address information of the communication monitoring device 32 to the control unit 224 (S13).
(2-4) Since preparation for setting a new path has been completed, a monitor activation response is returned from the transmission-side exchange 22 to the monitor receiver 31 (S14).
(2-5) The control unit 224 sets a monitor flag in the entry corresponding to the new path after the change in the subscriber information table 225 (S15).

(2-6) When silent data is detected in the silent pattern high-speed detection circuit 226 of the transmission-side exchange 22 (S16), based on the information obtained in the processes (2-2) and (2-3) above. The destination address of the packet data stored in the buffer 222 is changed. In this case, the control unit 224 changes the destination address to the communication monitor device 32 so as to pass through the communication monitor device 32.
(2-7) After the processes (2-5) and (2-6) are completed, data is transmitted to the communication monitor device 32 (S17).

(Control in the receiving exchange)
Control in the receiving-side exchange 23 will be described with reference to FIG. In the exchange 23 on the receiving side, the following processing is performed between the processing (1-1) and the processing (1-2).
(3-1) The monitor receiving device 31 transmits a monitor activation request including information on a path to be monitored to the receiving-side exchange 23 (S21).
(3-2) The control unit 234 in the receiving-side exchange 23 that has received the monitor activation request accesses the subscriber information table 235, searches for the corresponding destination address information, and specifies the corresponding path (S22). The subscriber information table 235 returns the destination address information of the communication monitor device 32 to the control unit 234 (S23).

(3-3) Since preparation for setting a new path is completed, a monitor activation response is returned from the receiving-side exchange 23 to the monitor receiving device 31 (S24).
(3-4) The control unit 234 sets a monitor flag in the entry corresponding to the new path after the change in the subscriber information table 235 (S25).
(3-5) After the processing of (3-4) is completed, data is transmitted from the communication monitor device 32 to the exchange 23 on the receiving side (S26).

(Control within the communication monitoring device)
Control in the communication monitor device 32 will be described with reference to FIG.
(4-1) After the monitor activation request is received from the monitor receiver 31 by the control unit 324 (S31), the resources in the copy unit 325 are confirmed (S32), and the transmission side exchange 22 and the reception side exchange 23 are transferred to. The address information of the communication monitoring device 32 is transmitted (S33).
(4-2) A monitor activation response is returned to the monitor receiver 31 (S34).

(Packet data control in the transmission side exchange after path switching)
When the path is switched by the above processing, the transmission side switch 22 performs the following packet data control. That is, the buffer 222 in the exchange 22 converts the address of the corresponding packet data into the address of the communication monitor device 32. The converted packet data is transmitted to the communication monitor device 32.

(Packet data control in the receiving exchange after path switching)
When the path is switched by the above processing, the following packet data control is performed in the exchange 23 on the receiving side.
(5-1) The sequence number is checked in the buffer 232 in the exchange 23. Depending on the check result, the following processing (5-2) or (5-3) is performed.
(5-2) When a packet of sequence number “N + 1” after path switching arrives after a packet of sequence number “N” before path switching, it is transmitted to the next exchange as it is.

(5-3) When the packet with the sequence number “N + 1” after the path switching arrives earlier than the packet with the sequence number “N” before the path switching, the packet with the sequence number “N−1” before the path switching. After arrival, a waiting process is performed for a certain time. The waiting time may be set a little longer than the packet transmission interval.
If the packet of sequence number “N” does not arrive even after performing this waiting process, the packet of sequence number “N + 1” is transmitted to the next node. If a packet with sequence number “N” arrives after transmitting a packet with sequence number “N + 1” to the next node, it is discarded.

(Packet data control in the communication monitoring device after path switching)
When the path is switched by the above processing, the communication monitor device 32 performs the following packet data control. That is, packet data received via the input interface 321 is input to the copy unit 325. The copy unit 325 copies the packet data for transmission to the receiving-side exchange 23 and the monitor receiving device 31. Then, an address is assigned to the copied packet data, and the packet data is transmitted to the exchange 23 on the receiving side and the monitor receiving device 31.
As described above, by detecting a silent part and performing path switching, path switching can be performed while maintaining communication quality for the user.

(Communication monitoring method)
In the communication monitoring system described above, the following communication monitoring method is realized. That is, a communication monitoring method for monitoring data transmitted / received via a communication path, wherein a silence detecting step for detecting a silent portion of the data, and a response to the detection of the silent portion in the silent detection step An address changing step of changing the destination address of the data to an address via the communication monitoring device; and a step of monitoring the data by the communication monitoring device via a communication path switched by changing the address in the address changing step; A communication monitoring method including the above is realized.

  In this way, in response to the detection of the silent portion, by changing the destination address of the data to an address that passes through the communication monitor device, the communication monitor device passes through the communication path switched by the address change. Data can be monitored, and there is no delay in packet data due to path switching, and quality does not deteriorate.

2. Use of Multicast Function A case where packet data is transmitted and monitored to a monitor reception apparatus path in addition to the original voice call path by using the router multicast function will be described with reference to FIG. .
In the figure, an IP network 100 having access routers 51 to 54, an exchange 22 that communicates with the access router 51, a wireless access device 24 that communicates with the access router 52, and a base station that communicates with the access router 53. 25, a monitor receiver 31 that communicates with the access router 54, and a movable mobile terminal 41 such as a mobile phone terminal constitute a communication system.

(Destination address, multicast group address)
Here, it is assumed that a group address of a device to be multicast is set in advance in each router, and the monitor reception device 31 holds a multicast group address list for each device serving as a monitor point. In the multicast group address list 200, for example, the IP addresses of the target apparatuses are “BBBB” and “DDDD” with respect to the multicast group address “YYYY” as shown in FIG.

The “destination address” is an address of the next node, and is composed of an IP address and a UDP port number.
The “multicast group address” uses a class D IP address, and the first 4 bits are “1110”. The remaining 28 bits are the group number to be multicast. The data is distributed to all group members belonging to the group.

The IP address in the case of IPv4 is expressed by a 32-bit positive value. IP addresses are classified into four classes, class A to class D. In the case of class A, the first 1 bit starts with “0”, the first 8 bits are the IP network address part, and the remaining lower 24 bits are the IP host address part. The IP host address portion is an address that identifies a device that performs communication using TCP / IP.
In the case of class D, the first 4 bits start with “1110”, all of the first 32 bits are the IP network address part, and there is no IP host address part. This class D is used for multicast communication.
The destination address (D-IP) of the header is “AAAA”, the source address (S-IP) is “CCCC”, and the UDP is “X”.

(Processing of each part of the system)
(6-1) A monitor activation request is transmitted from the monitor receiving device 31 to the exchange 22 by a command or the like (S41). At that time, the subscriber telephone number of the mobile terminal 41 to be monitored is designated to collect call information, and the IP address of the device to be monitored (in this case, the wireless access device 24) is designated and stored in the monitor receiving device 31. The call information is composed of UDP (User Datagram Protocol) and IP (Internet Protocol).

(6-2) The monitor receiving device 31 that has collected the call information designates the subscriber's UDP number to the radio access device 24 if the destination IP address is equal to the IP address of the radio access device 24 to be monitored. From the multicast group address list, the group address is set to “YYYY” and an instruction to transmit data is given (S42). On the other hand, if the destination IP address of the collected call information does not match the IP address of the device to be monitored, the next destination IP address and UDP are collected.

(6-3) Upon receiving the multicast instruction from the monitor receiving device 31, the wireless access device 24 sets “AAA”, which is the transmission destination address (D-IP) described in the header of the data packet, to the multicast group address “ YYYY "is transmitted to the access router 52 (S43).
(6-4) The access router 52 that has received this data packet multicasts the data packet to the devices in the multicast group based on the converted destination address “YYYY” (S44).

  As described above, by using the multicast function of the access router, the call information is collected from the exchange and the monitor receiving device issues an instruction to the wireless device, thereby switching the path while maintaining the communication quality for the user, It can be carried out. It is obvious that the communication monitoring system described above can be applied even when a fixed terminal that cannot move is used instead of the mobile terminal 41.

3. Response to handover using multicast A case where monitor communication is continuously realized even when the mobile terminal 41 is handed over to a different area during monitor communication will be described with reference to FIG.
In the figure, an IP network 100 having access routers 51 to 56, an exchange 22 that communicates with the access router 51, a wireless access device 24 that communicates with the access router 52, and a base station that communicates with the access router 53. 25, a wireless access device 26 that communicates with the access router 55, a base station 27 that communicates with the access router 56, a monitor receiver 31 that communicates with the access router 54, and a movable movement such as a mobile phone terminal A communication system is configured by the terminal 41.

  Here, as in the case of FIG. 5, the group address of the device to be multicast is set in advance to each router, and the monitor receiving device 31 holds the multicast group address list for each device as the monitor point. Assumption. In the multicast group address list 300, for example, as shown in the figure, the target devices IP are “BBBB” and “DDDD” for the multicast group address “YYYY”. In addition, for the multicast group address “ZZZ”, the target devices IP are “FFFF” and “DDDD”.

(7-1) It is assumed that the mobile terminal 41 is handed over from the area of the base station 25 to the area of the base station 27 during monitoring between the radio access device 24 and the base station 25 (S51). That is, it is assumed that a handover is made to a different area.
(7-2) After this handover, the mobile terminal 41 transmits new location information to the exchange 22 (S52).
(7-3) The exchange 22 changes the transmission route based on the new position information (S53).
(7-4) The exchange 22 notifies the monitor reception device 31 that the monitor point has been changed from the wireless access device 24 to the wireless access device 26 (new IP, UDP) (S54).

(7-5) The monitor receiving device 31 designates the subscriber's UDP number to the radio access device 26, sets the group address to “ZZZ” from the multicast group list, and instructs to transmit data. (S55).
(7-6) Upon receiving the multicast instruction from the monitor reception device 31, the wireless access device 26 converts the data transmission destination address to the multicast group address “ZZZ” and transmits it to the access router 55 (S56).
(7-7) Upon receiving this data packet, the access router 55 multicasts the data packet to the devices in the multicast group based on the converted destination address “ZZZ” (S57).

  As described above, even when a mobile terminal performs a handover by collecting call information from an exchange and issuing an instruction from a monitor receiving apparatus to a wireless apparatus using a multicast function of an access router, communication to a user is performed. The communication can be monitored by switching the path while maintaining the quality.

(Summary)
Equipment costs can be reduced by centrally deploying the communication monitoring function in a separate device. In addition, by detecting a silent part and performing path switching, path switching can be performed while maintaining communication quality for the user. Also, there is a concern that the wireless device cannot monitor the wireless device because the subscriber's call information is unknown on the wireless network side. However, by implementing monitor communication using the multicast function, call information is collected from the exchange and received by the monitor. Communication monitoring can be performed by issuing an instruction from the device to the wireless device.

(Communication monitoring method)
In the communication monitoring system of “2.” described above, the following communication monitoring method is realized. That is, a communication monitoring method for monitoring data exchanged via a communication path, a call information acquisition step for acquiring call information related to a node through which data to be monitored passes, and call information acquired in the call information acquisition step A communication monitoring method is realized that includes an address conversion step of converting the destination address of the data into a multicast address including the address of the communication monitoring device and a step of monitoring data transmitted by multicast. In this way, by converting the destination address of the data to the multicast address including the address of the communication monitor device using the acquired call information, the communication monitor device can monitor the data transmitted by multicast.

  In the communication monitoring system of “3.”, in the address conversion step, the destination address of the data is changed to a new multicast according to the information notified along with the handover of the mobile terminal that receives the data to be monitored. It has been converted to an address. Therefore, even if the mobile terminal is located in a different area due to handover during the communication monitoring, the data destination address is set according to the information notified from the mobile terminal along with the handover. By converting to a new multicast address, communication monitoring can be continued.

(Other embodiments)
With respect to the description of the claims, the present invention may further take the following aspects.
(1) A communication monitoring method that realizes communication monitoring with a communication monitoring device that centrally deploys a communication monitoring function different from that of an exchange that processes data, requesting the exchange for path information that can be monitored from the monitor receiver, A step of transmitting a monitor activation request including path information that the monitor receiving device wants to monitor to the exchange for the corresponding path, a transmission path to the communication monitoring device, and a receiving path from the communication monitoring device. An exchange including a step of transmitting a monitor activation response from the exchange to the communication monitor device and transmitting the monitor activation response to the monitor receiver device, and a transmission path to the communication monitor device after completing the setting of the monitor path via the communication monitor device. After the silent pattern communication data is detected, the path is switched from the exchange to monitor the communication data. A step of transmitting, a step of copying by the communication monitoring device and transmitting to the exchange including the reception path from the monitor reception device and the communication monitoring device, and communication data before switching the communication monitor in the exchange including the reception path from the communication monitoring device, And a step of controlling the order of communication data after switching the communication monitor.

(2) In a mobile communication system that implements communication monitoring with a communication monitoring device that centrally deploys a communication monitoring function different from that of an exchange that processes data, it collects path information that can be monitored and makes a monitor activation request for the corresponding path. A monitor receiving device that receives the communication data whose path has been switched, a monitorable communication path search and a monitor activation request to the corresponding path, a monitor activation response is transmitted, and a silent pattern communication data is detected. Change the address, switch the communication path to the communication monitoring device, copy the communication data received after the monitor activation response and the exchange including the transmission path to the communication monitoring device that transmits the communication data to the communication monitoring device. A communication monitoring device that transmits to the exchange and the monitor receiving device, including Change the destination address from the path search and monitor start request and monitor start response to the corresponding path, switch the communication path to the communication monitor device, control the communication data before switching the communication monitor and the communication data after switching the communication monitor, A communication monitor system comprising: an exchange including a reception path from a communication monitor device that transmits to a next exchange.

(3) The exchange including the transmission path to the communication monitoring device accesses the subscriber information table for the subscriber information corresponding to the corresponding path for which communication monitoring is possible, and sets the acquired corresponding path. After detecting the silent pattern communication data in the high-speed silent pattern detection circuit of the exchange, the destination address is addressed to the communication monitor device in response to the instruction from the control unit and the control unit for instructing to change the destination address to the communication monitor device. A communication monitor system according to (2), further comprising a buffer unit for transmission after changing.

(4) The communication monitoring device receives an instruction from an exchange including a transmission path to the communication monitoring device, and outputs a control unit that instructs the buffer unit to set destination address information in an output side path of the communication monitoring device. (2) The communication monitoring system according to (2), further comprising: a buffer unit that copies communication data to the side path and the monitor reception side path, receives an instruction from the control unit, and sets a destination address.

(5) The exchange including the reception path from the communication monitoring device accesses the subscriber information table corresponding to the corresponding path for which communication monitoring is possible, searches for the corresponding destination address, and determines the path after the monitor switching. (2) The communication monitoring system according to (2), further comprising: a buffer unit that compares a sequence number of received data and transmits in order according to an instruction from the control unit.

(6) A communication monitoring method for realizing communication monitoring by using a multicast function of a router, wherein the monitor receiving device requests call information of a path that can be monitored from the monitor receiving device and obtains an answer; A step of determining a device (wireless access device) as a monitoring point from the acquired call information and the multicast group address list, a UDP from the monitor receiving device to the wireless access device, and a destination address of the corresponding data A step of instructing transmission by converting to a multicast group address; a step of transmitting a data transmission destination address to a multicast group address by the wireless access device; and a step of transmitting the data to the access router. Applicable device (base station / monitor) The mobile communication method characterized by comprising the steps city of multicast transmission to the receiving device).

(7) A mobile communication system that implements communication monitoring using the multicast function of a router, collects call information of paths that can be monitored from an exchange, and stores the IP address of a device (radio access device) that becomes a monitor point If the data transmission destination IP address and the IP address of the wireless access device serving as the monitoring point are compared and matched, the data transmission destination address is converted into the multicast group address from the multicast group address list and transmitted to the wireless access device. A monitor receiving apparatus that designates the UDP of the subscriber to instruct, and receives a monitor activation request from the monitor receiving apparatus, and transmits call information (IP, UDP) of the specified subscriber to the monitor receiving apparatus The destination address for the UDP data specified by the exchange and the monitor receiver Multicast from a wireless access device that transmits data to the access router based on an instruction to convert the IP address to a multicast group address and transmit the data to the access router, and a device in the multicast group (wireless access device, monitor receiving device) A communication monitoring system including an access router for transmitting.

(8) A communication monitoring method that enables continuous monitor communication when a mobile terminal is handed over to a different area during monitor communication while realizing communication monitoring using the multicast function of the router. When the mobile terminal is over, the mobile terminal transmits new position information to the switch, the switch changes the transmission route based on the new position information and transmits data, and the switch transmits a monitor point to the monitor receiver. A step of notifying that the (IP, UDP) has been changed, and the monitor receiving device designates UDP for the device (wireless access device) as a new access point, and the destination address of the corresponding data is the multicast group address. The wireless access device sends a data destination address And the step of converting the network address into a multicast group address and transmitting the data to the access router, and the access router performing multicast transmission from the destination address of the received data to the corresponding device (base station / monitor receiving device). A communication monitoring method characterized by the above.

(9) A communication monitoring system in which monitor communication can be continued when a mobile terminal is handed over to a different area during monitor communication while implementing a communication monitor using the multicast function of the router. The mobile terminal that transmits new location information to the exchange when handed over to the area, and the data transmission route is changed based on the new location information, and the monitor point (IP, UDP) is changed for the monitor receiver Specifying the subscriber's UDP to convert the destination address of the data to the multicast group address from the multicast group address list and sending it to the switch and the new monitoring point device (radio access device) The monitor receiver that gives instructions and the UDP data specified by the monitor receiver A wireless access device that transmits data to the access router based on an instruction to convert the transmission destination address to a multicast group address, and a device in the multicast group from the data transmission destination address (wireless access device, monitor reception device) A communication monitoring system comprising an access router for multicast transmission.

  The present invention can be applied to a case where a communication monitor is realized without causing deterioration of communication quality. In addition, communication monitoring can be continued even when the mobile terminal is handed over.

It is a figure which shows the structural example of the communication monitor system using a silence detection system. It is a figure which shows the example of a subscriber information table. It is a figure which shows the structural example of the communication monitor system using a silence detection system. It is a figure which shows the structural example of the communication monitor system using a silence detection system. It is a figure which shows the structural example of the communication monitoring system using a multicast system. It is a figure which shows the structural example of the communication monitoring system using a multicast system. It is a figure which shows the general example in the case of monitoring the communication path utilized for packet communication. It is a figure which shows the communication state after the start of a communication monitor. It is a figure which shows a mode that a data packet is transmitted to a communication monitoring apparatus.

Explanation of symbols

11, 14 Terminal devices 22, 23 Exchanges 24, 26 Wireless access devices 25, 27 Base station 31 Monitor receiving device 32 Communication monitoring device 41 Mobile terminals 51-56 Access router 100 IP network 200, 300 Multicast group address list tables 221, 231 , 321 Input interface 222, 232, 322 Buffer 223, 233, 323, 326 Output interface 224, 234, 324 Control unit 225, 235 Subscriber information table 226 Silent pattern high-speed detection circuit 325 Copy unit

Claims (6)

A communication monitoring system for monitoring data exchanged via a communication path,
Silence detection means for detecting a silent portion of data to be monitored ;
The destination address of the data to be the monitor in response to the silence is detected by the silence detector, the first address conversion means that converts the address via the communication monitoring device,
Call information acquisition means for acquiring call information relating to a node through which the data to be monitored passes;
Handover notification information acquisition means for acquiring information notified in response to a handover of a mobile terminal that receives the data to be monitored;
The destination address of the data to be monitored in response to the acquisition of the information notified along with the handover of the mobile terminal by the handover notification information acquisition means is changed to a multicast address including the address of the communication monitoring device Second address conversion means for converting ,
Wherein the communication monitoring device monitors the data to be the monitor via the first address is switched by the conversion of the address by the conversion unit communication path when the silence, The handover of the mobile terminal The communication monitoring system is characterized in that monitoring of the data to be monitored that is multicast-transmitted by the address conversion by the second address conversion means is continued at the time .   A communication monitoring system for monitoring data exchanged via a communication path,
  Silence detection means for detecting a silent portion of data to be monitored;
  First address conversion means for converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent part by the silence detection means;
  Call information acquisition means for acquiring call information relating to a node through which the data to be monitored passes;
  Handover notification information acquisition means for acquiring information notified in response to a handover of a mobile terminal that receives the data to be monitored;
  Third address conversion means for converting a destination address of the data to be monitored into a new multicast address in accordance with information notified by the handover notification information acquisition means with handover of the mobile terminal; Including
  In the communication monitoring device, the data to be monitored is monitored through a communication path switched by address conversion by the first address conversion means at the time of the silent part, and at the time of handover of the mobile terminal A communication monitoring system characterized by continuing monitoring of the data to be monitored that is multicast-transmitted by the address conversion by the third address conversion means.   3. The silence detecting means detects a silence part by comparing a silence pattern defined in advance with a pattern included in data exchanged via a communication path. The communication monitoring system described.   The apparatus according to any one of claims 1 to 3, further comprising means for controlling the reception order of data before and after switching of the communication path based on a sequence number assigned to the data. The communication monitoring system described.   A communication monitoring method for monitoring data exchanged via a communication path,
  A silent detection step for detecting a silent portion of the data to be monitored;
  A first address conversion step of converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent portion by the silence detection step;
  A call information acquisition step of acquiring call information related to a node through which the data to be monitored passes;
  A handover notification information acquisition step of acquiring information notified in response to a handover of a mobile terminal that receives the data to be monitored;
  The destination address of the data to be monitored in response to the acquisition of the information notified along with the handover of the mobile terminal by the handover notification information acquisition step is changed to a multicast address including the address of the communication monitoring device. A second address conversion step of converting,
  In the communication monitoring device, the data to be monitored is monitored via a communication path switched by address conversion in the first address conversion step at the time of the silent part, and at the time of handover of the mobile terminal A communication monitoring method characterized by continuing to monitor the data to be monitored that is multicast-transmitted by the address conversion in the second address conversion step.   A communication monitoring method for monitoring data exchanged via a communication path,
  A silent detection step for detecting a silent portion of the data to be monitored;
  A first address conversion step of converting a destination address of the data to be monitored into an address via a communication monitoring device in response to detection of a silent portion by the silence detection step;
  A call information acquisition step of acquiring call information related to a node through which the data to be monitored passes;
  A handover notification information acquisition step of acquiring information notified in response to a handover of a mobile terminal that receives the data to be monitored;
  A third address conversion step of converting a destination address of the data to be monitored into a new multicast address in accordance with the information notified with the handover of the mobile terminal by the handover notification information acquisition step; Including
  In the communication monitoring device, the data to be monitored is monitored via a communication path switched by address conversion in the first address conversion step at the time of the silent part, and at the time of handover of the mobile terminal A communication monitoring method characterized by continuing to monitor the data to be monitored that is multicast-transmitted by the address conversion in the third address conversion step.

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