JP2004289414A - Packet communication system and apparatus therefor, and packet communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packet communication system and a packet communication method capable of executing communication with packet quality for object users, that is, wherein a delay variation and a loss rate are suppressed, as a network service for many users using general-purpose terminals. <P>SOLUTION: When packets satisfying prescribed conditions reach a prescribed input end point 111 in a packet communication network 100, the information in the payload of the packets is transmitted to one or more prescribed relay points 121 to 123 in the packet communication network 100 or another output end point 131 and the one or more relay points 121 to 123 in the packet communication network 100, the relay points 121 to 123 transmit the information in the payload of the received packets to the other relay point or the output end point 131, and the output end point 131 transmits the information to a called terminal 152 when the information in the payload of the received packets is derived from that of the same packets having been already received. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a packet communication system, and more particularly, to a packet communication system, an apparatus, and a packet communication method capable of performing communication while suppressing packet delay fluctuation and loss rate.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method using priority control, a method for performing bandwidth reservation, a method using FEC (Forward Error Correction), and a proxy have been proposed as methods for enabling communication with packet communication quality, especially packet delay fluctuation and loss rate. There has been proposed a method of using the method, a method of using packet path diversity, and the like (for example, see Patent Document 1).
[0003]
Among these, the method using priority control is a method in which a node in the network preferentially processes a packet desired to be communicated with high quality, thereby suppressing loss due to buffer waiting delay and buffer overflow. Comments) 2474, RFC2475, RFC3260, and the like, which are described in detail in, for example, Diffserv.
[0004]
A method of reserving a band is a method of allocating a band to a flow of a packet desired to be communicated with high quality and controlling the flow of another packet so as not to use the band. (Resource Reservation Protocol) is one example.
[0005]
The method using FEC is, for example, a method in which voice information already transmitted by VoIP communication is loaded onto voice information after a predetermined time has passed and transmitted, and one example is “Matsuoka, Teraoka, Voice Quality Compensation in Internet Mobile Phones”. Method "<http: // www. csl. sony. co. jp / ic2000 / papers / WIP04. pdf>.
[0006]
In addition, the method using a proxy is combined with the method of performing priority control or bandwidth reservation. Packets of a priority flow pass through the proxy, and only packets having the proxy as the source address or destination address are processed with priority. Or a reserved band (for example, see Patent Document 1).
[0007]
Further, the method using packet path diversity is a method in which a transmitting terminal sends a flow to a predetermined relay server in addition to a flow sent to a receiving terminal, and sends a plurality of flows through different routes to avoid quality deterioration. (For example, see Non-Patent Document 1).
[0008]
[Patent Document 1]
JP 2002-252623 A
[Non-patent document 1]
Yi J. Liang, Eckehard G .; Steinbach, and Bernd Girod, "Real-time Voice Communication over the Internet Using Packet Path Diversity"<http: // www. lkn. ei. tun. de / ~ steinb / PUBLICATIONS / acm01. pdf. gz>
[0009]
[Problems to be solved by the invention]
However, such conventional packet communication systems have the following problems, respectively.
[0010]
First, in the method that uses priority control, the nodes whose destination link bandwidth is filled with priority flows do not send packets that make up other flows, disconnect non-priority communication, and implement a priority control function at each node. In addition, it is necessary to notify each node of the priority flow, which is difficult to operate.
[0011]
Even in the method of performing bandwidth reservation, the bandwidth is frequently reserved for nodes in the network, which is troublesome and lacks operability.
[0012]
The method using the FEC is effective as a method for imparting resistance to the loss rate, but is unsuitable for real-time communication because the delay increases when a packet is lost.
[0013]
The method using the proxy cannot solve the problem that the priority control function and the band reservation function need to be implemented in each node in the method using the priority control and the method using the band reservation.
[0014]
The method using packet path diversity requires special terminals for the transmitting terminal and the receiving terminal, and lacks versatility.
[0015]
The present invention has been made in order to solve such a conventional problem, and provides packet communication of a target user, that is, communication with reduced delay fluctuation and loss rate, to a network service for a large number of users using a general-purpose terminal. It is an object of the present invention to provide a packet communication system and a packet communication method that can be implemented as the above.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a packet communication system according to the first aspect of the present invention is a packet communication system including a plurality of nodes for relaying communication between communication terminals or between communication networks. An incoming end point for receiving a packet satisfying a predetermined condition from the network and transmitting information in the payload of the packet; a relay point for relaying and transmitting information in the payload of the packet received from the incoming end point; If the information in the payload of the packet received via the side endpoint or the relay point does not originate from the same packet as the one already received, the outgoing endpoint sending that information to the receiving communication terminal or network. It is characterized by having.
[0017]
As a result, communication can be performed by selecting a path having the highest quality among a plurality of paths of the packet communication network, and for example, there is an advantage that a delay in real-time communication can be reduced and an amount of buffer for absorbing delay fluctuation can be reduced. Can be
[0018]
Also, in the packet communication system according to the second aspect of the present invention, the packet that satisfies the predetermined condition has an identifier in the payload, and the outgoing endpoint uses the identifier to determine whether the received packet has already been received. Or not.
[0019]
This makes it possible to absorb delay fluctuations due to variations in the transfer speed and arrival time of each media packet based on the sequence numbers of the media packets.
[0020]
Further, in the packet communication system according to the third aspect of the present invention, when the ingress endpoint sends a packet, the ingress endpoint attaches an identifier capable of identifying the packet to the ingress endpoint, and then transmits one or more relays. A point or an outgoing endpoint and one or more relay points, the relay point assigns an identifier equal to the corresponding received packet to a packet sent to another relay point or an outgoing endpoint, and the outgoing endpoint It is characterized in that it is determined whether or not the received packet has already been received using the identifier.
[0021]
This allows the outgoing endpoint to compare the identifiers of two or more packets sent from two or more relay points, including those that have previously passed through one or more other relay points, or At the egress endpoint, or the packet identifier sent directly from the ingress endpoint, or sent from one relay point, including the case where it has previously passed through one or more other relay points. By comparing the identifier of the packet with the identifier of the packet sent directly from the ingress endpoint at the egress endpoint, it can be determined whether the information in the payload of the packet has already been received.
[0022]
Further, the packet communication system according to the invention of claim 4 has a function of establishing a connection by transmitting and receiving a signal with a communication terminal or a communication network at the time of starting communication, and monitoring and changing the signal. It is characterized in that predetermined information of the included terminal address information is changed to a predetermined address of an incoming end point or an outgoing end point.
[0023]
This allows the originating terminal and the receiving terminal to secure the confidentiality of the terminal address information for communication with the other party.
[0024]
A packet communication system according to a fifth aspect of the present invention has a function of establishing a connection between a communication terminal and a communication network at the start of communication by transmitting and receiving a signal and terminating the signal. In this case, a predetermined address of the incoming end point or the outgoing end point is described as the address of the communication partner.
[0025]
Thus, the packet communication network can secure the confidentiality of the address information for each terminal or network.
[0026]
The packet communication system according to the invention of claim 6 is characterized in that the ingress terminal point and the relay point generate and transmit a plurality of packets when transmitting the packet to the plurality of relay points.
[0027]
Thereby, the same copied media packet can be simultaneously sent to a plurality of relay points and outgoing end points.
[0028]
The packet communication system according to the invention of claim 7 is characterized in that the ingress terminal point and the relay point transmit a packet to a plurality of relay points using a multicast function of the network.
[0029]
As a result, the load required for copying the packets at the ingress end point and the relay point is reduced, and the bandwidth of the egress port at the ingress end point and the relay point can be saved.
[0030]
Further, in the packet communication system according to the invention of claim 8, the incoming end point and the relay point are, for each packet reaching the incoming side end point and the relay point, from a predetermined condition that the packet satisfies, the outgoing end point of the destination or It is characterized in that one or more relay points are determined.
[0031]
This enables communication with quality changed for each user or for each application.
[0032]
The packet communication system according to the invention of claim 9 is characterized in that one or both of the source address information and the destination address information of the packet satisfies a specific condition as the predetermined condition.
[0033]
As a result, the information in the payload of the packet can be sent to a plurality of locations in accordance with the source address information and the destination address information, and communication can be performed in which the route with the highest quality is selected at the output end point.
[0034]
In the packet communication system according to the tenth aspect, the predetermined condition is that traffic information of the communication network collected by a function of collecting traffic information of the communication network satisfies a specific condition. And
[0035]
Thereby, packet communication according to the traffic information can be performed.
[0036]
In the packet communication system according to the eleventh aspect of the present invention, the apparatus constituting the entry end point or the relay point transmits the packet to one or more predetermined relay points for each predetermined condition satisfied by the received packet. It is characterized by.
[0037]
As a result, after information in the payload of the packet is transmitted to a plurality of locations under predetermined conditions, communication can be performed in which a route with the highest quality is selected at the output end point.
[0038]
Further, the device constituting the outgoing end point in the packet communication system according to the twelfth aspect of the present invention discards if the information in the payload of the received packet is derived from the same packet as that already received, and discards it. If not, the packet is transmitted to a predetermined link.
[0039]
As a result, traffic in the network can be suppressed.
[0040]
A packet communication method according to a thirteenth aspect of the present invention is a packet communication method using a packet communication network comprising a plurality of nodes for relaying communication between communication terminals or communication networks. When the packet reaches the incoming end point, the information in the payload of the packet is transmitted to one or more predetermined relay points in the packet communication network or one or more predetermined outgoing end points in the packet communication network. Send to the relay point, the relay point sends the information in the payload of the received packet to another relay point or outgoing end point, and the outgoing end point has the same information in the payload of the received packet as already received If the information is not derived from the packet, the information is sent to the relay destination.
[0041]
Thereby, it is possible to perform communication by selecting a path having the highest quality among a plurality of paths of the packet communication network, to permit high-quality communication only to a specific user, or to permit only a specific application, Thus, an increase in traffic due to an increase in packets can be suppressed. Further, a general-purpose, high-quality communication service can be provided without adding a special function to the transmitting terminal and the receiving terminal.
[0042]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0043]
FIG. 1 is a diagram showing the configuration of the packet communication system according to the first embodiment of the present invention. The packet communication network 100 is connected to networks 101 and 102 managed by others, and the transmitting terminal 151 and the receiving terminal 152 perform real-time communication using, for example, voice or moving image via the networks, and the quality of the communication is improved. Keep high.
[0044]
A person who intends to perform high-quality real-time communication via the packet communication network 100 has been informed in advance of the address of the signal termination function 141 from the administrator of the packet communication network 100.
[0045]
The source terminal 151 and the destination terminal 152 establish a connection by a signaling procedure before exchanging media packets such as audio and video. If the transmitting terminal 151 does not know the address of the receiving terminal 152, an ID such as a telephone number is used to specify a destination. The calling terminal 151 sends a connection request signal to a signal terminating function 141 which is a network element managing the telephone number of the called terminal 152 and the address of the called terminal. As a result, the signal termination function 141 knows the media transmission address.
[0046]
The signal terminating function 141 that has received the connection request signal sends a connection request signal to the terminating terminal 152 so that connection processing is performed between the calling terminal 151 and the signal terminating function 141 and between the signal terminating function 141 and the terminating terminal 152. Will be done. Upon receiving the connection request signal, the receiving terminal 152 returns a connection response signal. Thus, the signal terminating function 141 can know the media receiving address of the receiving terminal 152.
[0047]
In this way, the signal terminating function 141 that has obtained the media transmission address of the calling terminal 151 and the media reception address of the called terminal 152 converts the address conversion into the incoming end point 111, the relay points 121 to 123, and the outgoing end point 131. Order the rules. According to this address conversion rule, a media packet passing through the ingress endpoint 111 is copied, distributed to a plurality of relay points 121 to 123, and collected at one egress endpoint 131.
[0048]
The outgoing end point 131 transmits, for each packet having the same original packet, only the earliest arriving copy of the collected media packets to the receiving terminal 152, and discards the others. In the above description, the case where only one-way media packets are present has been described. However, two-way communication using two-way media packets can be realized in a similar procedure.
[0049]
FIGS. 1 and 2 show an example in which the packet communication network 100 and the networks 101 and 102 are IP networks and the addresses exchanged by signals are pairs of IP addresses and TCP port numbers or UDP port numbers. This will be described with reference to FIG.
[0050]
Upon receiving the notification of the connection request, the receiving-side terminal 152 immediately accepts the incoming call and performs media communication. Note that, in normal real-time communication, a sequence number is assigned to a packet in order to absorb delay fluctuation. Therefore, in this embodiment, a media packet has a sequence number and the sequence number is used as an identifier. And
[0051]
FIG. 2 is a diagram showing an operation flow of the packet communication system of FIG. 1 according to the present embodiment.
[0052]
First, the calling terminal 151 sends a connection request signal to the signal termination function 141 via the network 101. The connection request signal includes the ID of the calling terminal 151, the ID of the receiving terminal (destination) 152, the signal address of the calling terminal 151 (signaling address), and the media sending address of the calling terminal 151 (media calling address). including.
[0053]
When receiving the connection request signal, the signal terminating function 141 searches the ID of the receiving terminal 152 for an address. At this time, another information such as the ID of the transmitting terminal 151 may be searched as a group, and an advanced transfer function based on the ID of the transmitting terminal 151 may be provided. In the present embodiment, it is assumed that the address of the receiving terminal 152 has been searched from the ID “b” of the receiving terminal. The signal terminating function 141 sends a connection request signal equivalent to that assumed by itself to the receiving terminal 152. At this time, the media transmission address of the signal termination function 141 is that of the outgoing end point 131.
[0054]
When receiving the connection request signal, the receiving terminal 152 accepts the incoming call and sends a connection response signal to the signal termination function 141. In this connection response signal, the media receiving address of the receiving terminal 152 is described.
[0055]
The signal terminating function 141 receives the connection response signal, and can recognize the media transmission address of the calling terminal 151 and the media receiving address of the called terminal 152 related to the connection. A conversion command for instructing transfer / selection is sent to the input end point 111, the relay points 121 to 123, and the output end point 131.
[0056]
In the conversion command to the ingress end point 111, the source (source) address instructs that the packet of the transmission terminal 151 be copied and transmitted to the relay points 121, 122, and 123 without changing the source address. In the conversion instruction to 121, 122, and 123, the originating address indicates that the media packet of the originating terminal 151 is to be transmitted to the outgoing end point 131 without changing the originating address. It instructs that the first one of the media packets having the same identifier that has the same identifier as the media packet of the calling terminal 151 be sent to the called terminal 152.
[0057]
In addition, the signal termination function 141 sends a connection response signal to the calling terminal 151. The address of the entry end point 111 is described in this connection response signal.
[0058]
With the signals so far, the connection between the transmitting terminal 151 and the receiving terminal 152 can be established via the incoming end point 111, the relay points 121 to 123, and the outgoing end point 131, and the transmission of the media packet is started. First, the transmitting terminal 151 transmits a media packet to the address of the ingress terminal point 111 obtained from the connection response signal.
[0059]
Upon receiving the media packet from the transmitting terminal 151, the ingress endpoint 111 transmits the media packet of the transmitting terminal 151 to the addresses of the relay points 121, 122, and 123 obtained from the conversion command by the signal terminating function 141. send. At that time, the packet may be copied into three packets in the ingress terminal point 111 and transmitted, or may be transmitted using a multicast function of the network 101 or the like.
[0060]
When the relay addresses 121, 122, and 123 receive the media packet of the originating terminal 151, the originating address of the originating terminal 151 is changed toward the address of the outgoing end point 131 obtained from the conversion command by the signal termination function 141. Send media packets.
[0061]
When the outgoing end point 131 receives the media packet of the originating address of the originating terminal 151, the originating end point 131 retrieves the identifier of the media packet from the previously received identifier list, stores the identifier if not received, and stores the originating address of the originating terminal. 151 media packets. If received, the packet is discarded.
[0062]
As a result, communication using a path having the highest quality among a plurality of paths becomes possible. For example, consider the case of performing two-way voice communication. It is assumed that a speech coding rule that can maintain sufficient speech quality by transmitting 99.9% of information is adopted. A lost packet is considered as a packet having a sufficiently large delay.
[0063]
If the end-to-end delay distribution is independent of the path and is represented by a distribution function F (x), the buffer amount for absorbing the delay fluctuation in the receiving terminal is usually the time a where F (a) = 0.999. Is required, and the amount of delay generation due to delay fluctuation and fluctuation absorption is 2a.
[0064]
On the other hand, in the embodiment of the present invention, the buffer amount is an amount corresponding to time b where F (b) = 0.968 (= 1−sqrt (1−0.999), sqrt is a function that returns a positive square root). And the delay generation amount is 2b. Generally, since the density function of the delay distribution has a long tail, the ratio between a and b becomes very large, and the effect of the present invention is great.
F (a) = 0.999 indicates that the probability that the delay exceeds a is 0.001. In the present embodiment, the probability that the delay exceeds a is 0.000001, and the delay reduction effect is obtained. Is large.
[0065]
In general, when the distribution function of the network delay is G (x), the probability that the delay becomes larger than a certain value x is represented by 1-G (x). When the delay distribution function when the present invention is applied is F (x), the probability 1-F (x) that the delay becomes larger than x when the present invention is applied is the delay distribution function G (x) of the network. Is represented as follows.
[0066]
1-F (x) = (1-G (x)) ＾ n (1)
Here, “＾” represents a power, and “n” represents the number of relay points. It is assumed that the incoming end point sends a packet to n relay points, and the n relay points sends a packet to the outgoing end point. From the equation (1), it can be seen that the probability that the delay increases becomes smaller by the n-th power according to the present invention.
[0067]
Next, an embodiment of the second invention will be described. In the embodiment of the first invention, since the packet communication network 100 terminates a signal, each of the terminals 151 and 152 performs communication in consideration of the packet communication network 100. However, the present invention may be applied in a form in which the packet communication network 100 does not terminate a signal.
[0068]
FIG. 3 shows a configuration of a packet communication network 200 according to the second embodiment of the present invention. The difference from the configuration of the packet communication network 100 according to the first embodiment of the present invention is that the signal termination function 141 is not required. The entry end point 211 exists on a path connecting the networks 201 and 202, and has an exchange function.
[0069]
The transmitting terminal 251 is assumed to know the address of the receiving terminal 252, and the transmitting terminal 251 sends a connection request signal to the address of the receiving terminal 252. When the incoming end point 211 on the route detects that the packet to be exchanged is that of the connection request signal, it changes the address information in the connection request signal, and the media address of the originating terminal 251 side is that of the outgoing end point 231. So that
[0070]
Further, upon detecting a response to the connection request signal sent from the receiving terminal 252 to the calling terminal 251 by the receiving terminal 252, the input terminal 211 changes the address information in the connection response signal so that the media address is changed to the address of the input terminal 211. To be something. Further, the ingress endpoint 211 applies the address translation rule of the media packet to itself, sends an address translation command to the relay points 221 to 223 and the egress endpoint 231, and the media packet is transmitted to the relay points 221 to 223 and the egress endpoint 231. To go through.
[0071]
Next, FIGS. 3 and 4 will be described with an example in which the packet communication network 200 and the networks 201 and 202 are IP networks, and an address exchanged by a signal is a pair of an IP address and a TCP port number or a UDP port number. It will be described with reference to FIG. The identifier used for the operation of the destination terminal 252 and the transfer determination at the egress endpoint 231 are the same as those in the first embodiment of the invention.
[0072]
First, the transmitting terminal 251 sends a connection request signal to the receiving terminal 252. The connection request signal includes a signal address (signaling address) of the calling terminal 251, a signal address (signaling address) of the receiving terminal 252, and a media sending address (media calling address) of the calling terminal 251. .
[0073]
The incoming end point 211 is installed as an exchange node on the route between the terminals 251 and 252, and upon detecting a connection request signal, the media terminal address of the originating terminal 251 in the connection request signal is output. 231 and sends it. In order to detect a signal, a packet having a predetermined port number may be monitored.
[0074]
When receiving the connection request signal, the receiving terminal 252 permits the incoming call and sends a connection response signal to the transmitting terminal 251. In the connection response signal, a media receiving address (media destination address) of the receiving terminal 252 is described.
[0075]
Upon detecting the connection response signal, the entry end point 211 sets the media transmission address of the transmission terminal 251 to that of the transmission terminal 251 in the connection response signal, and sets the media reception address of the reception terminal 252 to that of the entry end point 251 in the connection response signal. Change to each one and send. Further, the address conversion rule is applied to the ingress end point 211 itself, and a translation command is sent to the relay points 221 to 223 and the egress end point 231. Be routed by route.
[0076]
According to the address conversion rule applied to the ingress end point 211 itself, the source address copies the media packet of the transmission terminal 251 to the three packets of the destination (destination) addresses 221, 222, and 223 without changing the source address. And send it out. In the conversion instruction to each of the relay points 221 to 223, the packet of the originating terminal 251 is changed from the destination address to the address of the output end point 231 without changing the source address.
[0077]
The conversion instruction to the outgoing end point 231 instructs that the media packet of the originating address, which has the same identifier and has arrived first, of the originating terminal 251 be transmitted to the terminating terminal 252 without changing the originating address. .
[0078]
Receiving the connection response signal, the transmitting terminal 251 sends the media packet to the media receiving address of the receiving terminal 252 written in the connection response signal. Since the media arrival address is that of the incoming endpoint 211, the media packet is received by the incoming endpoint 211. The entry end point 211 sends out three packets with the destination address of the media packet as relay points 221, 222, and 223. The relay points 221, 222, and 223 transmit the destination address of the packet as the outgoing end point 231. The outgoing end point 231 sends to the receiving terminal 252 the one that arrives first among the received media packets having the same identifier.
[0079]
【The invention's effect】
As described above, according to the present invention, when a communication terminal or a packet that satisfies a predetermined condition reaches an incoming end point in a packet communication network, information in the payload of the packet is transmitted to one of the packets in the packet communication network. One or more predetermined relay points or predetermined outgoing endpoints in the packet communication network and one or more relay points are sent to the relay point, and the information in the payload of the packet received by the relay point is transmitted to another relay point or outgoing endpoint. If the information in the payload of the received packet does not originate from the same packet as that already received, the information is sent to the relay destination. It is possible to perform communication by selecting a path having the highest quality among the paths. For example, it is possible to reduce the delay of the real-time communication and reduce the delay fluctuation absorbing buffer amount.
[0080]
Furthermore, high-quality communication can be permitted only to a specific user or only to a specific application, and an increase in traffic due to an increase in packets can be suppressed. Further, by changing the number of copies of the media packet for each user, it is possible to provide a high-quality service of varying degrees for each user. Further, the terminal does not require any special function, and can provide a versatile high-quality communication service.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a packet communication system according to a first embodiment of the present invention.
FIG. 2 is an operation flowchart showing a flow of packet communication by the packet communication system of FIG. 1;
FIG. 3 is a configuration diagram illustrating a packet communication system according to a second embodiment of the present invention.
FIG. 4 is an operation flowchart showing a flow of packet communication by the packet communication system of FIG. 2;
[Explanation of symbols]
100, 200: packet communication network, 101, 102, 201, 202: network, 111, 211: incoming end point, 121, 122, 123, 221, 222, 223: relay point, 131, 231: outgoing end point, 141 : Signal termination function, 151, 251: originating terminal, 152, 252: destination terminal.

Claims (13)

A packet communication system comprising a plurality of nodes for relaying communication between communication terminals or communication networks,
An incoming end point that receives a packet that satisfies predetermined conditions from a communication terminal or a communication network on the transmitting side and that transmits information in the payload of the packet;
A relay point for relaying and transmitting information in the payload of the packet received from the ingress endpoint;
Unless the information in the payload of the packet received via the ingress or relay point is derived from the same packet as the one already received, the egress endpoint which sends that information to the receiving communication terminal or network. A packet communication system comprising: The packet communication system according to claim 1,
The packet satisfying the predetermined condition has an identifier in the payload,
A packet communication system, wherein the outgoing end point uses the identifier to determine whether or not the received packet has already been received. The packet communication system according to claim 1,
When sending a packet, the ingress end point attaches an identifier that can identify the packet to the ingress end point, and then sends the packet to one or more relay points or an egress end point and one or more relay points. Send
The relay point assigns an identifier equal to the corresponding received packet to a packet to be transmitted to another relay point or an outgoing end point,
A packet communication system, wherein the outgoing end point uses the identifier to determine whether or not the received packet has already been received. The packet communication system according to claim 2 or 3,
Has a function of establishing a connection by transmitting and receiving a signal with a communication terminal or a communication network at the start of communication and monitoring / changing the signal,
A packet communication system, wherein predetermined information of terminal address information included in the signal is changed to a predetermined address of an incoming end point or an outgoing end point. The packet communication system according to claim 2 or 3,
Having a function of establishing a connection by transmitting and receiving a signal with a communication terminal or a communication network at the start of communication and terminating the signal,
A packet communication system characterized in that a signal transmitted to a communication terminal or a communication network describes a predetermined address of an incoming end point or an outgoing end point as an address of a communication partner. The packet communication system according to claim 4 or 5,
A packet communication system, wherein the entry end point and the relay point generate and transmit a plurality of packets when transmitting a packet to the plurality of relay points. The packet communication system according to claim 4 or 5,
A packet communication system characterized in that an ingress terminal point and a relay point transmit a packet to a plurality of relay points using a multicast function of a network. The packet communication system according to any one of claims 1 to 7,
The ingress endpoint and the relay point determine, for each packet reaching the ingress endpoint and the relay point, an egress endpoint or one or more relay points of a destination from predetermined conditions that the packet satisfies. Communications system. The packet communication system according to claim 8,
The packet communication system, wherein the predetermined condition is that one or both of the source address information and the destination address information of the packet satisfy a specific condition. The packet communication system according to claim 8,
The packet communication system, wherein the predetermined condition is that the traffic information of the communication network collected by the function of collecting traffic information of the communication network satisfies a specific condition. An apparatus which constitutes an incoming end point or a relay point in the packet communication system according to claim 4 or 5,
An apparatus for transmitting a packet to one or more predetermined relay points for each predetermined condition satisfied by a received packet. An apparatus constituting an outgoing end point in the packet communication system according to claim 4 or 5,
If the information in the payload of the received packet is derived from the same packet as that already received, discard the packet, otherwise transmit the packet to a predetermined link. In a packet communication method using a packet communication network including a plurality of nodes for relaying communication between communication terminals or communication networks,
When a packet that satisfies a predetermined condition reaches an ingress end point in the packet communication network, information in the payload of the packet is transferred to one or more predetermined relay points in the packet communication network or in the packet communication network. Sending to a predetermined outgoing end point and one or more relay points,
The relay point sends the information in the payload of the received packet to another relay point or outgoing end point,
A packet communication method, wherein the outgoing end point sends the information to the relay destination unless the information in the payload of the received packet is derived from the same packet as that already received.

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