JP3786934B2 - Packet transfer system, packet monitoring method, call control device, and packet transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packet transfer system, a packet monitoring method, a call control device, and a packet transfer device, and more particularly, a terminal transmits a test packet having a lower priority than an original communication packet prior to communication, so that a required bandwidth is obtained. The present invention relates to a packet transfer system, a packet monitoring method, a call control device, and a packet transfer device that perform observation-type admission control led by a terminal that performs communication after estimating the communication possibility and the currently available communication band.
[0002]
[Prior art]
Conventionally, in terminal-driven observation-type admission control, the state management and admission control functions for each communication (here synonymous with flow) are deployed on the terminal, reducing the processing load on the communication network, realizing scalability, As a result, a bandwidth securing type communication method that suppresses the communication cost has been proposed (see, for example, Non-Patent Document 1).
[0003]
[Non-Patent Document 1]
Viktoria Elek, 2 others (Gunnar Karlsson, Rovert Ronngren), "Admission control based on end-to-end measurements", 2000 Infocom Conference (Infocom 2000) ), US, IEEE, March 29, 2000
[0004]
[Problems to be solved by the invention]
When a public communication service is provided using a method for determining whether or not a terminal can communicate autonomously in a distributed manner as in the prior art described above, the call control device uses a service subscription to perform actual flow control. After performing primary acceptance determination such as confirmation, it is necessary to monitor the user's packet transmission amount by the edge packet transfer apparatus. However, in the terminal-driven observation type admission control, the method of transferring the test packet with a lower priority than the priority packet for performing the original communication is premised on a state transition in which the packet priority display is changed during the communication. . To accurately monitor this with the edge router using the conventional method of controlling the operation of the edge router one by one with the call control device, it is necessary to frequently exchange control signals with the call control device. Increase in bandwidth and processing load will increase.
[0005]
In the packet flow rate monitoring in the conventional quality assurance type packet transfer system, only the maximum value of the flow rate is observed. However, in the case of terminal-driven observation type admission control, it is determined that the communication network temporarily becomes empty when the terminal reduces the communication amount or interrupts the communication. Therefore, when another terminal sends a test packet, it passes through it and accepts a new communication.
[0006]
The present invention has been made in view of the circumstances as described above, and the object of the present invention is also in the case of terminal-driven observation-type admission control in which test packets having different priorities and priority packets are transferred. Another object of the present invention is to provide a packet transfer system, a packet monitoring method, a call control device, and a packet transfer device capable of monitoring a service type and a flow rate of a packet appropriately and inexpensively without increasing a processing load.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the packet transfer system according to claim 1 makes a call setup request in a trial class in the priority of packet forwarding, and the priority class or the trial class again according to the quality result of communication related to the call. A plurality of terminal devices that make a call setting request in the network, a plurality of packet transfer devices that are interposed between the plurality of terminal devices and transfer packets from each terminal device at each level of the priority, and each terminal device emits A packet transfer system comprising: a call control device for managing a call state, wherein the call control device includes contract information including at least a transition pattern of a priority level usable in each terminal device accommodated therein. In addition to storing in advance, when a call is established, the packet transfer device that accommodates each terminal device that communicates with the call identifies the packet that is transmitted and received by the call. Information for determining whether a packet transmitted / received in the call conforms to the contract information, information including an identifier representing at least the priority level transition pattern, When the packet transfer device receives the monitoring information, the packet transfer device predicts a transition of the priority level of the packet transmitted by the terminal device communicating with the call based on the identifier. The gist is to determine whether the service type related to the priority is compatible with the contract information.
[0008]
In the present invention, a terminal-driven observation type that first makes a call setup request in the trial class in the packet transfer priority, and makes a call setup request in the priority class or again in the trial class according to the communication quality result of the call. In the admission control, when the monitoring instruction is sent from the call control device to the packet transfer device, the identifier indicating the transition pattern of the priority level is notified. Monitoring can be performed while predicting a transition in the priority level of a packet transmitted by a terminal device communicating by a call.
[0009]
The packet transfer system according to claim 2 is the packet transfer system according to claim 1, wherein when the packet transfer apparatus determines that the service type does not conform to the contract information, the packet transfer system The gist is to notify the call control device, and the call control device disconnects the communication related to the call.
[0010]
In the present invention, when it is determined that the service type does not conform to the contract information, the call control device disconnects communication related to the call.
[0011]
The packet transfer system according to claim 3, in the packet transfer system according to claim 1, when the packet transfer apparatus determines that the service type does not conform to the contract information, the packet transfer system discards the packet. The gist is to do.
[0012]
In the present invention, a packet in violation of the contract is discarded. Therefore, only packets that match the contract information are transferred.
[0013]
The packet transfer system according to claim 4 is the packet transfer system according to claim 1, wherein when the packet transfer apparatus determines that the service type does not conform to the contract information, The gist of the transfer is the priority according to the service type that matches the contract information.
[0014]
In the present invention, the packet in violation of the contract is also changed to a packet that matches the contract information. Therefore, all the packets are set to match the contract information.
[0015]
The packet transfer system according to claim 5 is the packet transfer system according to any one of claims 1 to 4, wherein the call control device is requested to perform a call setting at the time of a call setting request from the terminal device. The gist is to determine whether or not the service type of the call is compatible with the contract information, and to reject the call setting request if it is not compatible.
[0016]
In the present invention, if a call that does not match the contracted priority is set, the call setting is rejected. Therefore, a call that violates the contract is rejected before the packet is transmitted.
[0017]
In order to achieve the above object, a packet transfer system according to claim 6 includes: a plurality of terminal apparatuses that perform call setting requests related to packet transfer in service types corresponding to a plurality of priorities; Packet transfer comprising: a plurality of packet transfer apparatuses that are interposed between terminal apparatuses and transfer packets from each terminal apparatus at each priority level; and a call control apparatus that manages the state of a call originated by each terminal apparatus The call control device, when a call is established, includes information for identifying a packet transmitted / received by the call to a packet transfer device that accommodates a terminal device that communicates with the call, and And monitoring information including information for determining whether a packet transmitted / received by a call conforms to the contract information, and the packet transfer apparatus relates to the minimum flow rate of the packet. When the monitoring information is received when the monitoring information is received, the flow rate of the packet transmitted by the terminal device that communicates with the call is monitored, and if the flow rate falls below the threshold value, the fact is The call control device is configured to disconnect the communication related to the call when the call control device receives a notification that the flow rate has fallen below the threshold value.
[0018]
According to the present invention, when a call is established and packet communication is started, but the packet flow rate is less than a predetermined amount, communication related to the call is disconnected.
[0019]
The packet transfer system according to claim 7 is the packet transfer system according to claim 6, wherein the packet transfer apparatus has a preset upper limit threshold value relating to a maximum flow rate of packets, and the flow rate is the upper limit value. When the threshold value is exceeded, the call control device is notified of the fact, and when the call control device receives a notification that the flow rate exceeds the upper limit threshold value, the call control device disconnects the communication related to the call. Is the gist.
[0020]
In the present invention, when the packet flow rate exceeds a predetermined amount, the communication related to the call is disconnected, so that both can be monitored together with the case where the packet flow rate does not reach the predetermined amount.
[0021]
The packet transfer system according to claim 8 is the packet transfer system according to claim 6 or 7, wherein the packet transfer device monitors the flow rate of the packet based on a size of a token bucket. The gist is to set a value larger than the initial value of the token counter as the threshold value related to the minimum flow rate.
[0022]
In the present invention, the increase / decrease of the packet flow rate is integrally monitored based on the token counter of the token bucket.
[0023]
In order to achieve the above object, the packet monitoring method according to claim 9 makes a call setup request in a trial class in the priority of packet transfer, and determines a priority class or again according to a quality result of communication related to the call. Make a call setup request in the trial class With multiple terminal devices Forward the packet With multiple packet forwarding devices A packet monitoring method in a packet transfer system, in which contract information including at least a transition pattern of a priority level that can be used for each user is set in advance, and packets transmitted and received by the call after a call is established Information for identifying, information for determining whether a packet transmitted / received in the call conforms to the contract information, and information including an identifier representing at least a transition pattern of the priority level , Based on the monitoring information including, predicting the transition of the priority level of the packet to be transferred, and determining whether the service type related to the priority conforms to the contract information The gist.
[0024]
In the present invention, a terminal-driven observation type that first makes a call setup request in the trial class in the packet transfer priority, and makes a call setup request in the priority class or again in the trial class according to the communication quality result of the call. In the admission control, when the monitoring instruction is sent from the call control device to the packet transfer device, the identifier indicating the transition pattern of the priority level is notified. Monitoring can be performed while predicting a transition in the priority level of a packet transmitted by a terminal device communicating by a call.
[0025]
In order to achieve the above object, a packet monitoring method according to claim 10 makes a call setting request related to packet transfer in a service type corresponding to a plurality of priorities. With multiple terminal devices Forward the packet at each priority level With multiple packet forwarding devices A packet monitoring method in a packet transfer system, wherein after a call is established, the flow rate of a packet related to the call is monitored, and when the flow rate falls below a preset threshold value related to the minimum flow rate of the packet, The gist is to disconnect the communication related to the call.
[0026]
According to the present invention, when a call is established and packet communication is started, but the packet flow rate is less than a predetermined amount, communication related to the call is disconnected.
[0027]
In order to achieve the above object, the call control device according to claim 11 receives a call setting request in a trial class in the priority of packet transfer, and determines whether the priority class or again according to a quality result of communication related to the call. A call control device that receives a call setting request in a trial class, a contract information storage unit that stores in advance contract information including at least a transition pattern of a priority level that can be used by each terminal device accommodated therein, and a call setting request Sometimes, a contract information determination unit that determines whether or not a service type of a call for which call setting is requested conforms to the contract information, and a packet that accommodates a terminal device that communicates with the call when the call is established Information for identifying a packet transmitted / received in the call and information for determining whether the packet transmitted / received in the call conforms to the contract information. A monitoring information notification unit for notifying the monitoring information including at least information including an identifier representing a transition pattern of the priority level, and a packet indicating that the service type does not conform to the contract information. And a call state management unit that disconnects communication related to the call when received from the transfer device.
[0028]
In order to achieve the above object, a packet transfer apparatus according to claim 12 is a packet transfer apparatus for transferring a packet with a priority according to a service type, for identifying a packet transmitted and received by a call. And information for determining whether a packet transmitted / received in the call conforms to the contract information and including at least an identifier representing a transition pattern of the priority level. When the monitoring information is received, based on the identifier, the transition of the priority level of the packet transmitted by the terminal device communicating with the call is predicted, and the service type related to the priority conforms to the contract information. A class transition monitoring unit that determines whether or not the packet is discarded, and discards the packet when it is determined that the service type does not conform to the contract information If, when the service type is determined not to conform to the contract information is summarized in that comprising, a packet rewriting unit for rewriting the adapted service type to the service type the contract information.
[0029]
In order to achieve the above object, the packet transfer apparatus according to claim 13 is a packet transfer apparatus that transfers a packet with a priority according to a service type, and is preset with respect to the minimum flow rate of the packet. Monitoring that includes a threshold value, information for identifying a packet transmitted / received by a call, and information for determining whether a packet transmitted / received by the call conforms to the contract information A summary is provided with a packet flow rate monitoring unit that monitors whether or not the flow rate of the packet transmitted by the terminal device that communicates by the call falls below the threshold when receiving the information.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a packet transfer system, a packet monitoring method, a call control device, and a packet transfer device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an embodiment of a packet transfer system according to the present invention. FIG. 2 is a diagram illustrating packet priority levels in the packet transfer system.
[0031]
The packet transfer system 1 according to the present embodiment transfers IP (Internet Protocol) packets, and in particular, performs real-time communication such as voice communication using IP packets. A call for real-time communication with a terminal device is established, and packet transfer between the terminal devices is controlled.
[0032]
Further, quality of service (QoS) is controlled based on service information in the header of the IP packet, and each terminal device determines the service quality of the IP packet to be transmitted by contract.
[0033]
In FIG. 1, a packet transfer system 1 according to the present embodiment communicates with a plurality of packet transfer apparatuses 10a to 10d that transfer packets, and communicates with the plurality of packet transfer apparatuses 10a to 10d to the packet transfer apparatuses 10a and 10d, respectively. And a call control device 20 that controls calls such as voice communication between the connected terminal devices 30a and 30b and stores contract information of service quality of each terminal device.
[0034]
The call control device 20 includes a contract information determination unit 201 that determines whether the service type actually requested by the terminal devices 30 and 30b is included in the service type included in the contract information, The service type call notification unit 202 that notifies the packet transfer apparatuses 10a and 10d of the service type information for each packet monitoring instruction, and the monitoring information is notified to the packet transfer apparatuses 10a and 10d for the packet monitoring instruction for each call. Preliminary storage of contract information including at least a priority level transition pattern that can be used in each terminal device accommodated, a monitoring information advance notification unit 203, a call control function unit 204 that controls the exchange of calls between terminal devices A contract information storage unit 205.
[0035]
The packet transfer device 10a (10d) receives the received packet when the service type of the packet header of the IP packet sent from the terminal device 30a (30b) does not match the communication service type set in the monitoring information. The packet rewrite unit 101a (101d) that rewrites the service type of the packet to the communication service type set in the monitoring information, and the service type of the packet header of the IP packet sent from the terminal device 30a (30b) is the monitoring information. When the service type does not match the set communication service type, the packet discard unit 102a (102d) for discarding the received packet and the communication packet sent by the terminal device 30a (30b) are monitored, respectively. The service type of the communication whose packet header service type is set in the monitoring information A class transition monitoring unit 103a (103d) that determines whether or not they match, and monitors a packet according to the packet priority class transition, and monitors the flow rate of the communication packet. It has a packet flow rate monitoring unit 104a (104d) that determines whether or not it is within the minimum value limit, and a packet transfer function unit 105a (105d) that prioritizes and transfers packets transmitted and received between terminal devices. .
[0036]
Based on the service type (Type Of Service) set in the header of the received packet, the packet transfer apparatuses 10a to 10d transfer the packets with priority, for example, DiffServe (Differentiated Services). . For example, as shown in FIG. 2, levels are divided into H, M, and L in descending order of priority, and received packets are assigned to any level based on the service type, and the priority order corresponding to the priority of each level. Packets are transferred for each level.
[0037]
The contract information stored in the call control device 20 is, for example, a service type that expresses data communication without bandwidth guarantee, real-time communication with bandwidth guarantee and transfer delay time, delay fluctuation, and packet loss rate guarantee. Yes, communication is permitted if the service type requested by the terminal is included in the contracted service type, but if it is not included, the communication is rejected.
[0038]
Further, the priority of the packet to be used and the transition pattern of the packet priority are associated with the service type, and the monitoring information set by the call control device 20 is called by the monitoring information prior notification unit 203. It is set from the control device 20 to the packet transfer device.
[0039]
FIG. 3 is a flowchart illustrating a processing procedure in the call control device when a call setting request is received.
In the packet transfer system 1, when the terminal device 30 a sets up a call for real-time communication, first, the call control is performed for a call setting request including information on a destination to be communicated and information on a communication service type indicating real-time communication. Transmit to device 20.
[0040]
When receiving the call setting request from the terminal device 30a, the call control device 20 acquires the service type of the communication requesting the call from the service type information included in the call setting request (step S11). The service type is compared with the service type listed in the contract information for the caller terminal device 30a stored in the contract information storage unit 205 (step S12), and the service type of the communication requested for call setting is the contract information. If it is not included in the service type (No in step S12), the call is rejected (step S16).
[0041]
If the service type of communication requested for call setting is included in the service type of the contract information (Yes in step S12), the service type listed in the contract information of the partner terminal device 30b is read from the partner information. (Step S13) The communication type requested for call setting is compared with the service type listed in the contract information of the destination terminal device 30b (Step S14), and the type of communication requested for call setting is the destination terminal. If it is not included in the service type listed in the contract information of the device 30b (No in step S14), the call is rejected (step S16).
[0042]
If the service type of the communication requested for call setting is included in the service type listed in the contract information (Yes in step S14), the caller terminal device inquires whether it can communicate with the counterpart terminal device 30b. A call setting request including information on 30a and information on the communication service type is transmitted to the partner terminal device 30b (step S15).
[0043]
When receiving the call setting request from the call control device 20, the counterpart terminal device 30b determines information on the calling source terminal device 30a, information on a communication service type, and the like. It returns to the call control device 20 that there is.
[0044]
FIG. 4 is a flowchart showing a processing procedure in the call control device when a call is established.
When notified from the partner terminal device 30b that communication is possible, the call control device 20 adds identification information such as an identification number to the set call, assuming that the call is set (step S21). The information of the calling terminal device 30a and the partner terminal device 30b, the information of the communication service type, and the like are stored in association with the identification information (step S22).
[0045]
Next, the call control device 20 transmits and receives between the terminal devices 30a and 30b to the packet transfer device 10a accommodating the call source terminal device 30a and the packet transfer device 10d accommodating the counterpart terminal device 30b, respectively. Monitoring information including information for identifying a packet to be transmitted (for example, both IP address and port number information), communication service type information, call identification information, and the like is instructed (step S23). ).
[0046]
Next, the call control device 20 notifies both the caller terminal 30a and the partner terminal 30b that a call has been set (step S24).
[0047]
When the notification that the call is set is received, the terminal devices 30a and 30b each start real-time communication to the partner terminal device using a real-time communication protocol such as RTP (Real-time Transport Protocol).
[0048]
The packet transfer apparatuses 10a and 10d that have received the service type derive monitoring information from the service information based on the information notified in advance from the monitoring information prior notification unit 203 of the call control apparatus 20. The class transition monitoring units 103a and 103d of the packet transfer apparatuses 10a and 10d monitor the communication packets transmitted from the terminal apparatuses 30a and 30b, respectively, and the service type of the IP packet header is set in the monitoring information. It is determined whether or not it matches the service type of communication. Further, the packet flow rate monitoring units 104a and 104d of the packet transfer apparatuses 10a and 10d monitor the flow rate of the packet of the communication and determine whether or not the flow rate is within the limit between the maximum value and the minimum value. Since both the maximum value and the minimum value are monitored by one packet flow rate monitoring unit 104a (104d) in this way, the equipment cost is reduced.
[0049]
The packet transfer apparatuses 10a and 10d determine that the packet is an appropriate packet if the priority of the IP packet header matches the priority corresponding to the communication service type and the flow rate is within the limits of the maximum value and the minimum value. Then, the packet is transferred with priority processing according to the priority order as it is.
[0050]
When the terminal-driven observation type reception control method is used, a change in priority used during communication is expected. Therefore, in the present invention, the transition pattern of the packet priority display is made common in advance in the call control device 20 and the packet transfer devices 10a and 10d, and an identifier is attached to the common transition pattern. The call identification information 20 notifies the packet transfer apparatuses 10a and 10d of the identifier as a transition pattern when instructing packet monitoring for each call. The class transition monitoring units 103a and 103d of the packet transfer apparatuses 10a and 10d sequentially receive individual instructions from the call control apparatus 20 by considering the transition pattern corresponding to the notified identifier after determining that the packet is appropriate. Without deriving the proper priority of the next arriving packet and the associated flow rate, it prepares for the next monitoring. As an example of an appropriate priority pattern (transition pattern), a test packet is transmitted in a trial class (M level) to determine whether communication is possible at the beginning of communication, and the transmission time is 5 seconds or more. When it is determined that communication is impossible in view of the communication status of the test packet, there is a certain period of time before the next test packet is transmitted, and when it is determined that communication is possible, the priority packet is continuously transmitted in the priority class (H level). Etc. are included.
[0051]
The packet transfer apparatuses 10a and 10d have the priority of the IP packet header that does not match the priority corresponding to the communication service type, or the flow rate exceeds the upper limit of the maximum value, or the flow rate exceeds the lower limit of the minimum value. In the case, the contract violation notification including the call identification information and the reason for violation is transmitted to the call control device 20.
[0052]
When the call control device 20 receives the contract violation notification, the call control device 20 reads information on the pair of terminal devices in communication from the notified call identification information, and notifies each terminal device to request disconnection and release of the call.
[0053]
In the present embodiment, the contract contents of the counterpart terminal device are also checked, and if the requested level is higher than the contract level, the call establishment is rejected. Establishing a call at a level according to the contract details of the partner terminal device, only communication from the partner terminal device to the calling terminal device, or only communication from the calling terminal device to the partner terminal device May be.
[0054]
As another aspect of the present embodiment, in the packet transfer apparatuses 10a and 10d, the service type of the packet header of the IP packet transmitted from the terminal apparatus 30a or 30b is equal to the communication service type set in the monitoring information. If not, the received packet is discarded by the packet discard units 102a and 102d. With this configuration, it is possible to prevent inflow of packets that violate the contract, and communication can be performed using only packets that conform to the contract.
[0055]
As still another aspect of the present embodiment, in the packet transfer apparatuses 10a and 10d, the service type of the communication in which the service type of the packet header of the IP packet transmitted from the terminal apparatus 30a or 30b is set in the monitoring information is When they do not match, the packet rewriting units 101a and 101d rewrite the received packet service type to the communication service type set in the monitoring information. By configuring in this way, a packet in violation of the contract can be transferred as a packet conforming to the contract information, and communication using only a packet conforming to the contract can be achieved.
[0056]
Next, the point that the upper limit and the lower limit of the flow rate can be monitored with an integrated apparatus will be described. FIG. 5 is a diagram illustrating transition of the token counter according to arrival of a packet in the embodiment of the present invention.
In FIG. 5, the burst size B1 is set as the initial value of the token counter, the value of the token counter is subtracted by the packet length according to the arrival of the packet, and then increased according to the leak rate. is there. In the example shown in FIG. 5, since the burst size (lower limit) is exceeded by arrival of the packet indicated by # 3, in other words, the flow rate exceeds the maximum value, and the packet is discarded as a violation.
[0057]
As a feature of the present invention, the upper limit value of the token counter is set to be larger than the initial value, and the token counter is allowed to increase to a certain value even when the initial value is exceeded. In FIG. 5, an upper limit value (minimum flow rate) is set when the value of the token counter further increases by B2 bytes from the initial value. By this calculation, it is possible to monitor a situation where packets do not arrive so much (the flow rate is extremely low).
[0058]
In order to detect that the packet does not arrive very much, it is necessary to check the value of the token counter at a different timing from the arrival of the packet. Therefore, the detection method is to calculate the time required for the token counter to exceed the upper limit at the time of the previous packet transmission, set the monitoring trigger, and start the monitoring trigger when the packet does not actually arrive. There are a method for detecting an event and a method for periodically detecting a trigger regardless of packet arrival and detecting the event. In the example shown in FIG. 5, after the arrival of the packet indicated by # 7, the value of the token counter exceeds the upper limit value (the flow rate falls below the minimum value). Disconnected.
[0059]
【The invention's effect】
According to the present invention, in the monitoring instruction from the call control device to the packet transfer device, the identifier indicating the transition pattern of the priority level is notified, and then the packet transfer device communicates with the call based on the identifier. Since the monitoring is performed while predicting the transition of the priority level of the packet transmitted by the terminal device that performs the packet monitoring, the priority monitoring of the packet is performed without complicated processing even in the observation-type reception control led by the terminal. be able to.
[0060]
Further, if packets that violate the contract are discarded, the inflow of packets that violate the contract can be prevented, and the service quality according to the contents of the contract can be maintained.
[0061]
In addition, if the service type of a packet that violates the contract is rewritten so that it conforms to the contract, the packet that violates the contract can be transferred as a packet that conforms to the contract, and the service quality according to the contract contents Can be maintained.
[0062]
Here, it is determined whether the service type requested at the time of call setup conforms to the contract, and if the call setup is rejected when the contract is violated, the call that violates the contract before packet transfer is rejected. Service quality in accordance with the contents of the contract.
[0063]
Further, not only the upper limit but also the lower limit of the packet flow rate can be monitored in a unified manner by one monitoring part, and economical realization is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a packet transfer system according to an embodiment of the present invention.
FIG. 2 is a diagram showing packet priority levels in the packet transfer system;
FIG. 3 is a flowchart showing a processing procedure in the call control device when a call setting request is received.
FIG. 4 is a flowchart showing a processing procedure in the call control device when a call is established;
FIG. 5 is a diagram illustrating transition of a token counter according to arrival of a packet in the embodiment of the present invention.
[Explanation of symbols]
10a to 10d packet transfer device
101a, 101d Packet rewriting unit
102a, 102d Packet discard unit
103a, 103d Class transition monitoring unit
104a, 104d Packet flow rate monitoring unit
105a, 105d Packet transfer function part
20 Call control device
201 Contract information determination section
202 Service type call notification unit
203 Monitoring information prior notification part
204 Call state management unit
205 Contract information storage unit
30a, 30b terminal device

Claims (13)

Between a plurality of terminal devices that perform a call setup request in a trial class in the priority of packet transfer and make a call setup request in a priority class or a trial class again according to the quality result of communication related to the call, and the plurality of terminal devices A packet transfer system comprising: a plurality of packet transfer apparatuses that transfer packets from each terminal apparatus at each level of the priority; and a call control apparatus that manages a state of a call issued by each terminal apparatus. There,
The call control device stores in advance contract information including at least a transition pattern of a priority level that can be used by each terminal device accommodated, and each terminal device that communicates with the call when a call is established. Information for identifying a packet transmitted / received by the call and information for determining whether a packet transmitted / received by the call conforms to the contract information to the packet transfer apparatus to be accommodated, and at least the priority Monitoring information including an identifier including an identifier indicating a transition pattern of a degree level, and
When the packet transfer device receives the monitoring information, the packet transfer device predicts a change in the priority level of the packet transmitted by the terminal device communicating with the call based on the identifier, and the service type related to the priority is determined. A packet transfer system for determining whether or not the contract information is met. When the packet transfer apparatus determines that the service type does not conform to the contract information, the packet transfer apparatus notifies the call control apparatus to that effect, and the call control apparatus disconnects communication related to the call. The packet transfer system according to claim 1. 2. The packet transfer system according to claim 1, wherein the packet transfer apparatus discards the packet when determining that the service type does not conform to the contract information. 2. The packet transfer apparatus according to claim 1, wherein when the service type determines that the service type does not conform to the contract information, the packet transfer apparatus transfers the packet with a priority related to the service type that conforms to the contract information. The packet transfer system described in 1. The call control device determines whether or not the service type of the call requested for call setting conforms to the contract information at the time of a call setting request from the terminal device. The packet transfer system according to any one of claims 1 to 4, wherein the packet transfer system is rejected. A plurality of terminal devices that make a call setting request related to packet transfer in a service type corresponding to a plurality of priorities, and intervening between the plurality of terminal devices, packets from each terminal device at each priority level A packet transfer system comprising a plurality of packet transfer devices for transfer and a call control device for managing the state of a call issued by each terminal device,
When the call is established, the call control device transmits / receives the information for identifying the packet transmitted / received by the call and the packet transfer device accommodating each terminal device communicating by the call by the call. And monitoring information including information for determining whether the packet conforms to the contract information,
The packet transfer device has a preset threshold value related to the minimum flow rate of the packet, and when receiving the monitoring information, monitors the flow rate of the packet transmitted by the terminal device communicating with the call, If it falls below the threshold, notify the call control device to that effect,
When the call control device receives a notification that the flow rate has fallen below the threshold value, the call control device disconnects communication related to the call. The packet transfer device has a preset upper limit threshold value relating to the maximum flow rate of packets, and when the flow rate exceeds the upper limit threshold value, notifies the call control device to that effect, and The packet transfer system according to claim 6, wherein the control device disconnects communication related to the call when receiving a notification that the flow rate exceeds the upper limit threshold value. The packet transfer device monitors the flow rate of the packet based on a token bucket size, and sets a value larger than an initial value of a token counter as a threshold value related to the minimum flow rate of the packet. The packet transfer system according to claim 6 or 7. Performs call setup request at trial class in priority packet transfer, and a plurality of terminal devices cormorants line call setup request at the priority class or again attempt classes depending on the quality of the communication result according to the call, a plurality of forwarding packets A packet monitoring method in a packet transfer system comprising the packet transfer device of
Set in advance contract information that includes at least a priority level transition pattern that can be used for each user,
Information for identifying a packet transmitted / received in the call after a call is established, and information for determining whether a packet transmitted / received in the call conforms to the contract information, at least the priority And information including an identifier representing a level transition pattern, and predicting a priority level transition of a packet to be transferred based on monitoring information including the service type related to the priority A packet monitoring method characterized by determining whether or not the information conforms to contract information. Packet transfer system comprising a plurality of terminal devices cormorants line a call setup request relating to the transfer, a plurality of packet transfer device for transferring the packets at the level of each priority of the packet in the service type corresponding to the plurality of priority A packet monitoring method in
After the call is established, the flow rate of the packet related to the call is monitored, and when the flow rate falls below a preset threshold value related to the minimum flow rate of the packet, the communication related to the call is disconnected. Packet monitoring method. A call control device that receives a call setting request in a trial class in packet transfer priority and receives a call setting request in a priority class or again in a trial class according to a communication quality result related to the call,
A contract information storage unit that stores in advance contract information including at least a transition pattern of priority levels that can be used in each terminal device accommodated;
A contract information determination unit that determines whether or not a service type of a call requested for call setting is compatible with the contract information at the time of call setting request;
When a call is established, information for identifying a packet transmitted / received by the call and a packet transmitted / received by the call are included in the contract information to a packet transfer device that accommodates each terminal device communicating by the call. A monitoring information notification unit for notifying the monitoring information including information for determining whether the information is suitable and including an identifier that represents at least a transition pattern of the priority level;
A call state management unit that disconnects communication related to the call when the service type receives from the packet transfer device that the service type does not conform to the contract information;
A call control device comprising: A packet transfer device that transfers packets with a priority according to the service type,
Information for identifying a packet transmitted / received by a call and information for determining whether a packet transmitted / received by the call conforms to the contract information, and at least a pattern of transition of the priority level And receiving monitoring information including an identifier that represents an identifier representing the priority level while predicting a transition of the priority level of a packet transmitted by the terminal device communicating with the call based on the identifier. A class transition monitoring unit that determines whether or not the relevant service type conforms to the contract information;
When it is determined that the service type does not conform to the contract information, a packet discard unit that discards the packet;
When it is determined that the service type does not conform to the contract information, a packet rewriting unit that rewrites the service type to a service type that conforms to the contract information;
A packet transfer apparatus comprising: A packet transfer device that transfers packets with a priority according to the service type,
It has a preset threshold value related to the minimum flow rate of the packet, and determines whether the packet transmitted / received by the call conforms to the contract information and information for identifying the packet transmitted / received by the call And a packet flow rate monitoring unit that monitors whether or not the flow rate of the packet transmitted by the terminal device that communicates with the call has fallen below the threshold value. Packet transfer device.

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