JP2002064557A - Re-packetizing transfer method, re-packetizing device, packet restoration device and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a re-packetizing transfer method and device for stream communication by which a transfer efficiency, number of packets and packet density in a network and an access channel can be improved independently of a state of other session. SOLUTION: A relay node adjacent to a transmission node extracts a packet belonging to a stream communication session from a packet group arrived until issue of a control trigger and stores the packets temporarily, again packetizes packets where number of coded frames included in each packet is the same and the same data coding method generating each coding frame is adopted for the packets into one packet again, an original packet number before re-packetizing and a head sequence number are recorded to a terminal header of the new packet, the resulting packet is transferred, the relay node adjacent to a reception node or the reception node decodes the packet group as being transmitted by the transmission node on the basis of the original packet number and the head sequence number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to real-time transmission of multimedia information such as voice and video data between a transmitting node and a receiving node connected to a packet switching network represented by the Internet via a packet switching network. The present invention relates to a technique for repacketizing a packet group and transferring it in a network when performing so-called stream communication for transmission and reception.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing the relationship between a packet switching network, transmitting nodes and receiving nodes. A relay node in the packet switching network adjacent to the transmitting node is called an ingress node, and a relay node in the packet switching network adjacent to the receiving node is called an egress node. For stream communication in an IP network, RTP (Rea
l Time Protocol) is used. In this case, since the 12-byte RTP header includes information necessary for the receiving terminal to reproduce the encoded frame in the order and interval generated by the transmitting terminal, the packet arrival order and interval are not guaranteed. Real-time communication is also possible on a network.

FIG. 7 is a diagram showing the structure of a packet. The above RTP header corresponds to the terminal header. RTP packets are usually transferred over UDP / IP,
The header corresponds to the communication network header. The resource number unique to the session corresponds to the port number. In VoIP, which provides voice communication over an IP network, voice data is generated at a low rate of about several kbps due to the progress of voice coding technology, which helps to save bandwidth. VoIP audio data corresponds to an encoded frame.

However, in low-rate stream communication such as VoIP, it has been pointed out that there is a problem in transfer efficiency that the header overhead due to each header of RTP and UDP / IP becomes too large compared to the payload length. In addition, since the VoIP transmitting terminal packetizes voice data in a short period of several milliseconds to several tens of milliseconds almost in synchronization with voice coding, a large amount of packets flows into the network, The increased density can overload the IP routing process.

[0005] On the other hand, there have been developed several techniques for reducing the header overhead by using the RTP and UDP / IP headers. One of them is to compress the RTP header. This is based on the information in the RTP header.
This is a method in which information and redundant portions of the DP / IP header are extracted and omitted, and a portion that cannot be dynamically changed even after a session for stream communication is established is not retransmitted. However, even if this method is applied, when a lower-rate data encoding method is applied, the rate of overhead reduction is reduced. Also, compressing the RTP header does not reduce the number and density of packets processed in the network.

Another method for improving transfer efficiency is to use R
This is to multiplex TP sessions. This method
When RTP packets of multiple sessions arriving at the ingress node pass through the same egress node, ingress
This is a method in which a node reconstructs a packet arriving before a control trigger is issued into a single UDP / IP packet for a group of packets belonging to these sessions. The trigger for issuing the control trigger is whether an encoded frame exceeding the threshold of the payload length that achieves the desired transfer efficiency has arrived, or whether a predetermined control cycle has elapsed. When performing multiplexing, a temporary header recording the IP address of the receiving terminal of each packet is stored in the payload of the UDP / IP packet together with the encoded frame. In response, the egress node
The multiplexed RTP session is decomposed again into packets as they arrive at the ingress node.

[0007] In this method, the degree of improvement in transfer efficiency due to multiplexing of RTP sessions and the degree of improvement in the number and density of packets in the network depend on the number of simultaneous RTP sessions connected by a common egress node. I do. Further, no improvement can be expected in the access lines between the transmitting terminal and the ingress node and between the receiving terminal and the egress node. Furthermore, a plurality of sequences belonging to the same session may be separately stored in the payload during multiplexing. In such a case, each of the plurality of sequences continues to have a terminal header, and furthermore, a temporary header is additionally added.

[0008]

As described above, in the prior art, when a packet switching network processes a packet group belonging to a stream communication session in a state where the packet is transmitted by a transmitting node, data encoding is performed. Depending on the rate of the method and the cycle of packetization, the transfer efficiency due to the header overhead is remarkably deteriorated, and the overload of the relay node may occur due to the increase in the number and density of packets processed in the network. .

On the other hand, the method of compressing the header is as follows.
Although the transfer efficiency is improved in a limited range, the number of packets and the density cannot be reduced. Further, in the method of multiplexing sessions, the transfer efficiency and the degree of improvement in the number of packets and the density depend on the number of simultaneous connections of a session sharing a common egress node. There is a problem that no improvement can be expected in the access line between them.

An object of the present invention is to provide a repacketized transfer method and apparatus for stream communication which can improve the transfer efficiency in a network and the number and density of packets regardless of the state of another session. is there. Another object of the present invention is to provide a repacketized transfer method and apparatus capable of improving the transfer efficiency and the number and density of packets on an access line between a receiving node and a relay node.

[0011]

In order to achieve the above object, a repacketing and transferring method according to the present invention comprises a transmitting node and a receiving node connected via a packet switching network including a plurality of relay nodes. In a repacketization transfer method for repacketizing a stream communication packet for transmitting and receiving multimedia information in real time over a network, the packet is generated by a transmitting node using an arbitrary data encoding method. Encoded frames are packetized at predetermined time intervals, and the packets are continuously transmitted as one session of stream communication. A relay node adjacent to the transmitting node transmits a stream from a group of packets arriving before the issuance of a control trigger. Packets belonging to the communication session are extracted and temporarily stored, and packets belonging to the same session are extracted. If there are multiple packets and the number of encoded frames included in each packet and the data encoding method that generated each encoded frame are the same, the packet group of the session is repacketized and newly configured. The original packet number before repacketization and the leading sequence number are recorded and transferred in the terminal header of the packet, and transferred at the relay node adjacent to the receiving node based on the original packet number and the leading sequence number. , Restores a group of packets as transmitted by the transmitting node, and transfers them to the receiving node.

According to the present invention, attention is paid to the characteristic that a large number of packets having the same header continuously flow into the network in the stream communication, and each session of the stream communication is performed in the relay node adjacent to the transmission node. If packets belonging to the same session are not stored as they are, they are temporarily stored until the control trigger is issued, and if multiple packets of the same session store the same number of encoded frames generated by the same method, the The packet group to which it belongs is reassembled into a single packet and then transmitted. The reassembled packet is forwarded through a plurality of relay nodes in the network. In this case, the relay node adjacent to the receiving node
The original packet number and the starting sequence number are recorded in the terminal header of the packet after the repacketization, and the sequence number of each packet before the repacketization is applied and the number of encoded frames stored in the payload. Therefore, the original packet group can be restored from the repacketized packets. As a result, the number of retransmissions of the same header in the network can be reduced to improve the transfer efficiency, and the number and density of packets in the network can be reduced.

Another repacketized transfer method according to the present invention is a stream for transmitting and receiving multimedia information in real time on a packet switching network between a transmitting node and a receiving node connected via a packet switching network including a plurality of relay nodes. In a repacketization transfer method for repacketizing a communication packet in a packet switching network, a transmitting node packetizes an encoded frame generated using an arbitrary data encoding method at a predetermined time interval, The packet is continuously transmitted as one session of the stream communication, and the relay node adjacent to the transmitting node extracts packets belonging to the stream communication session from a group of packets arriving before the issuance of the control trigger and temporarily stores the packets. There are multiple packets that belong to the same session and are included in each packet. When the number of encoded frames and the data encoding method that generated each encoded frame are the same, the packet group of the session is repacketized, and the terminal header of the newly configured packet is added to the terminal header before repackaging. The original number of packets and the leading sequence number are recorded and transferred, and the receiving node restores a packet group as transmitted by the transmitting node based on the original number of packets and the leading sequence number.

According to the present invention, the repacketized packet is transmitted not only in the network but also in the access line between the relay node and the receiving node in the network adjacent to the receiving node. It is possible to improve the transfer efficiency by reducing the number of retransmissions of the same header and to reduce the number and density of packets in the network. In this case, the receiving node can reproduce the sequence number erased at the time of repacketization from the sequence number of the packet after the repacketization and the number of encoded frames included in the packet. The group can be restored.

In the re-packetizing transfer method of the present invention, the control trigger that triggers the re-packetizing process is issued when an encoded frame exceeding a predetermined payload length threshold arrives, or It is desirable that the time be a predetermined control cycle has elapsed. In the former case, the transfer efficiency corresponding to the threshold is achieved in the communication network, and in the latter case, the number and density of packets in the network are suppressed to values corresponding to the control period for each session. The specific values of the payload length threshold value and the control cycle are set to values that do not impair the real-time performance of stream communication.

Also, the repacketizing apparatus of the present invention has a receiving buffer unit for receiving a packet, a packet identification unit for identifying a stream communication session from a group of arrived packets, and a packet extracted by the packet identification unit. A group is temporarily stored for each session, and a packet storage unit for confirming that the number of coded frames and a data coding method in a packet belonging to each session are the same, and a packet storage unit for re-packetizing. Retrieves each coded frame that contains a packet group that has been confirmed to be applicable, stores it in the payload of a single packet in the correct order for each session, and applies repacketization to the terminal header. Re-packetization processing unit for recording the minimum sequence number and the number of packets in the group of Routing processing unit for performing routing processing to look at headers for network packets that, and, characterized by comprising a transmission buffer unit for performing transfer processing of the packet.

The packet restoration apparatus of the present invention includes a reception buffer unit for receiving a packet, a packet identification unit for identifying a stream communication session from an arriving packet, and a terminal header of the packet extracted by the packet identification unit. A packet restoration unit for restoring a group of packets as transmitted by the transmission node based on the number of packets before repacketization and the sequence number at the head recorded in the packet, and look at the communication network header of the transferred packet. A routing processing unit for performing a routing process, and a transmission buffer unit for performing a packet transfer process.

Further, another packet restoration apparatus according to the present invention comprises:
A reception buffer unit for receiving a packet, a packet identification unit for identifying a stream communication session from an arriving packet, and before re-packetization recorded in a terminal header of a packet extracted by the packet identification unit. Based on the number of packets and the sequence number at the beginning,
A packet restoring unit for restoring a packet group as transmitted by the transmitting node is provided.

In the program recording medium of the present invention, the node of the packet switching network identifies at least whether or not the packet arriving at the node belongs to any session of the stream communication. A step of confirming that the number of encoded frames of the packet and the data encoding method are the same, a step of temporarily storing the packet for each session, and a total of the payload length of the temporarily stored packet is a predetermined threshold. A step of determining whether or not the number of packets exceeds the limit, a step of restoring the encoded frame in the payload in the order of generation, and a first sequence number and a packet before the repacketization in the terminal header of the packet after the repacketization. The program for executing the step of recording the number is recorded.

According to another program recording medium of the present invention, a node of a packet switching network identifies at least whether or not an arriving packet belongs to any session of stream communication, and contents of a terminal header of the packet. Determining whether or not repacketization processing is applied to the packet based on the packet, and re-recording the packet recorded in the terminal header for the packet to which repacketization processing is applied. From the number of packets before packetization and the sequence number at the beginning, reset the terminal header of each packet of the original packet group, allocate encoded frames equally to each payload, and packet as transmitted by the forwarding node It is a recording of a program for executing the step of restoring a group.

Still another program recording medium of the present invention comprises:
A step in which the receiving node identifies at least whether or not the arriving packet belongs to any session of the stream communication; based on the content of the terminal header of the packet, the packet is re-packetized. Judging whether or not the packet has been repacketized to the original packet from the number of packets before repacketization recorded in the terminal header and the leading sequence number. A program for resetting the terminal header of each packet of the group, equally allocating encoded frames to each payload, and executing a step of restoring the packet group as transmitted by the forwarding node is recorded. is there.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a repacketizing device in an ingress node. The re-packetizing device 10 includes a reception buffer unit 11, a packet identification unit 12, a packet storage unit 13,
It includes a re-packetizing processing unit 14, a routing processing unit 15, and a transmission buffer unit 16.

All packets passing through the ingress node arrive at the reception buffer unit 11. The packet identification unit 12
The stream communication session is identified from the arrived packet group. The packet storage unit 13 temporarily stores the packet group extracted by the packet identification unit 12 for each session,
It is confirmed that the number of encoded frames and the data encoding method in the packet belonging to each session are the same. The re-packetization processing unit 14 extracts each encoded frame storing a packet group confirmed to be applicable to the re-packetization by the packet storage unit 13, and outputs a single frame in the correct order for each session. The packet is stored again in the payload of the packet, and the minimum sequence number and the number of packets in the packet group to which repacketization is applied are recorded in the terminal header. The routing processing unit 15 performs the routing processing by looking at the communication network header of the transferred packet. The transmission buffer unit 16 performs a transfer process of all packets transmitted from the node.

FIG. 2 is a diagram showing the relationship between repacketization and restoration according to the present invention. Packetization is a process of configuring a packet that enables packet exchange in a communication network and reproduction of an encoded frame in a receiving node, and the configured packet includes a communication network header, a terminal header, and a payload. The communication network header includes the address of the receiving node and a resource number unique to the session. The combination of these two types of information becomes the session identifier. The terminal header includes a sequence number and a payload type. The sequence number is the serial number of the packet from the start of the session that is given to each packet so that the receiving node plays the encoded frame in the correct order and interval, and the payload type is the encoding stored in the payload of the packet. This is information indicating the data encoding method that generated the frame. The payload stores one or more encoded frames in the order in which they were generated.

[0025] Repacketization is a process in which a transmission node reconfigures each coded frame separately formed into a plurality of packets into a single packet for each session. At the time of repacketizing, the encoded frames are sorted based on the sequence number of the packet storing them, and are stored again in the payload of the repacketized packet in the order in which they were generated. In the terminal header of the packet after the repacketization, the sequence number and the number of packets of the packet that first arrived from the transmitting node during the period until the issuance of the control trigger are recorded. Further, the repacketizing process does not affect the contents of the communication network header.

As shown in FIG. 2, it is assumed that the packet P11 belonging to the stream communication session s3 that has arrived at the ingress node has already arrived, and that P12 has subsequently arrived. The communication network header (corresponding to the UDP / IP header) of the packet P11 includes the address T1 of the receiving node and the session name s3, and the terminal header (corresponding to the RTP header) includes the sequence number 1 and the payload type B. , The payload includes encoded frames 1 to 3, the communication network header of the packet P12 includes the address T1 of the receiving node and the session name s3,
The terminal header includes a sequence number 2 and a payload type B, and the payload includes encoded frames 4 to 6. The trigger for issuing the repacketization control trigger is that the payload length of the packet P1 after the repacketization exceeds the threshold.

FIG. 3 is a flowchart for explaining the operation of the repacketizing apparatus in the ingress node.
First, the packet P12 is transmitted in the stream communication session s3.
(Step S1). When it is confirmed that the packet P12 belongs to the session s3, next, regarding the element s3-0 of the list structure storing the packet P11 belonging to the session s3 and the packet P12,
It is checked whether the number of stored encoded frames and the data encoding method are the same (step S2). If they are the same, the packet P12 is stored in the element s3-1 (step S3). Subsequently, it is checked whether or not the sum of the encoded frames of the elements s3-0 and s3-1 of the session s3 in the list structure exceeds the threshold of the payload length (step S4). If the threshold value is exceeded, as shown in FIG. 2, the encoded frames of the elements s3-0 and s3-1 are generated in the order in which they were generated, that is, in the order of encoded frames 1 → 6. It is stored in the payload of the packet P1 (step S5), and the sequence number 1, the payload type B and the number of packets 2 before the repacketization of the packet P11 before the repacketization are stored in the terminal header of the packet P1 after the repacketization. By recording (step S6), a single packet P1 is reconstructed from the packets P11 and P12.

If it is determined in step S4 that the total number of encoded frames does not exceed the payload length threshold, the process returns to step S1. Also, when it is confirmed in step S1 that the packet does not belong to the stream communication session, and when it is confirmed in step S2 that the number of encoded frames stored and the data encoding method are not the same. Ends the processing.

In this example, in step S4, it is determined whether or not the sum of the encoded frames exceeds the threshold value of the payload length. Instead, it is determined whether or not a predetermined control cycle has elapsed. You may make it determine.

FIG. 4 is a diagram showing an example of the configuration of a packet restoration apparatus for restoring a repacketized packet into an original packet group. The packet restoration device 20 in the egress node
Receive buffer unit 21, packet identification unit 22, packet restoration unit
23, including a routing processing unit 24 and a transmission buffer unit 25.

All packets passing through the egress node arrive at the reception buffer unit 21. The packet identification unit 22 identifies a stream communication session from the arrived packet. The packet restoring unit 23, based on the number of packets before repacketization and the leading sequence number recorded in the terminal header of the packet extracted by the packet identifying unit 22, extracts a packet group as transmitted by the transmitting node. Restore. The routing processing unit 24 performs the routing processing by looking at the communication network header of the transferred packet. The transmission buffer unit 25 performs a transfer process of all packets transmitted from the node.

FIG. 5 is a flowchart for explaining the operation of the packet restoration device in the egress node. First,
It is determined whether the arrived packet belongs to any session of the stream communication (step S11). When it is confirmed that the packet belongs to the stream communication session, it is next confirmed whether or not the packet is subjected to the re-packetizing process based on the contents of the terminal header of the packet (step S12). If repacketization processing is applied to the packet, the terminal header for each packet in the original packet group is determined from the number of packets before repacketization and the leading sequence number recorded in the terminal header. The reset is performed, the encoded frames are equally allocated to the respective payloads, and the packet group as transmitted by the transfer node is restored.

When it is confirmed in step S11 that the packet does not belong to the stream communication session, and
If it is confirmed in step S2 that repacketization processing has not been applied, the processing ends.

In the above example, the configuration and operation of the egress node when restoring the packet repacketized by the egress node adjacent to the receiving node to the original packet group has been described. The node may be provided so that the re-packetized packet is transferred from the egress node to the receiving node, and the receiving node performs processing for restoring the original packet group. in this case,
The packet restoration device includes a reception buffer unit 21, a packet identification unit 22, and a packet restoration unit 23. The operation of these components is the same as in the above example.

In the description of the above embodiment, the repacketizing device in the relay node on the transmitting node side, the relay node on the receiving node side, and the packet restoring device in the receiving node for implementing the repacketing transfer method of the present invention. Although an example of the configuration and operation has been described, these devices can be operated by a computer program, and the present invention includes a program recording medium that records these computer programs.

[0036]

As described above, according to the repacketized transfer method of the present invention, a packet group belonging to each session of stream communication is not transferred as it is, but is accumulated until the issuance of a control trigger, during which the same packet is transmitted. If multiple packets arrive in a session and meet certain conditions, the packets belonging to that session are reassembled into a single packet and forwarded, so they are independent of the state of other sessions. The equipment in the network can be used efficiently, and the overload of the relay node caused by the stream communication can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a repacketizing apparatus according to the present invention.

FIG. 2 is a diagram showing a relationship between repacketization and restoration according to the present invention.

FIG. 3 is a flowchart for explaining the operation of the repacketizing apparatus of the present invention.

FIG. 4 is a diagram showing a configuration example of a packet restoration device of the present invention.

FIG. 5 is a flowchart for explaining the operation of the packet restoration device of the present invention.

FIG. 6 is a diagram illustrating a relationship between a packet switching network, a transmitting node, and a receiving node.

FIG. 7 is a diagram illustrating a configuration of a packet.

[Explanation of symbols]

 Reference Signs List 10 repacketizer 11 reception buffer unit 12 packet identification unit 13 packet accumulation unit 14 repacketization processing unit 15 routing processing unit 16 transmission buffer unit 20 e packet restoration device 21 reception buffer unit 22 packet identification unit 23 packet restoration unit 24 routing Processing unit 25 Transmission buffer unit P11, P12 Original packet P1 Packet after repacketization

Claims (10)

[Claims] 1. A packet for stream communication in which a transmitting node and a receiving node connected via a packet switching network including a plurality of relay nodes transmit and receive multimedia information in real time on the packet switching network is transmitted within the packet switching network. In the repacketization transfer method of repacketizing and transferring, at a transmission node, an encoded frame generated by using an arbitrary data encoding method is packetized at predetermined time intervals, and the packet is used as one session of stream communication. The relay node adjacent to the transmitting node continuously transmits packets, extracts packets belonging to the stream communication session from the packet group arrived before the issuance of the control trigger, temporarily stores the packets, and stores packets belonging to the same session. Multiple, number of encoded frames included in each packet and each encoding When the data encoding method that generated the frame is the same, the packet group of the session is repacketized, and the number of original packets before repacketization and the sequence number at the beginning are added to the terminal header of the newly formed packet. Is recorded and transferred, and at the relay node adjacent to the receiving node, a packet group as transmitted by the transmitting node is restored based on the original packet number and the leading sequence number, and the packets are transferred to the receiving node. A repacketized transfer method. 2. A packet transmission / reception node, which is connected via a packet switching network including a plurality of relay nodes and transmits / receives multimedia information in real time on the packet switching network, transmits the packet in the packet switching network. In the re-packetizing transfer method of re-packeting and transferring the packet, a transmitting node packetizes an encoded frame generated by using an arbitrary data encoding method at a predetermined time interval, and transmits the packet to one session of stream communication. The relay node adjacent to the transmitting node extracts packets belonging to the stream communication session from the group of packets arriving before the issuance of the control trigger, temporarily stores the packets, and temporarily stores the packets belonging to the same session. And the number of encoded frames included in each packet and each code If the data encoding method that generated the frame is the same, the packet group of the session is repacketized, and the number of original packets before repacketization and the beginning sequence number are added to the terminal header of the newly formed packet. And transmitting the packet and restoring, at the receiving node, a packet group as transmitted by the transmitting node based on the original packet number and the leading sequence number. 3. The repacketized transfer method according to claim 1, wherein the control trigger is issued when a predetermined threshold of a payload length is exceeded. 4. The repacketized transfer method according to claim 1, wherein the control trigger is issued when a predetermined control cycle has elapsed. 5. A receiving buffer for receiving a packet, a packet identifying unit for identifying a stream communication session from an arrived packet group, and temporarily storing a packet group extracted by the packet identifying unit for each session. However, it was confirmed that repacketization can be applied in the packet storage unit and the packet storage unit for confirming that the number of encoded frames and the data encoding method in the packet belonging to each session are the same. Fetches each coded frame in which the group of packets stored is stored in the payload of a single packet in the correct order for each session, and re-packets the terminal header. Re-packetization processing unit for recording the sequence number and the number of packets, see the communication network header of the transferred packet A repacketizing apparatus comprising: a routing processing unit for performing a routing process; and a transmission buffer unit for performing a packet transfer process. 6. A reception buffer unit for receiving a packet, a packet identification unit for identifying a stream communication session from an arriving packet, and a packet recorded in a terminal header of a packet extracted by the packet identification unit. Based on the number of packets before packetization and the leading sequence number, a packet restoration unit for restoring a group of packets as sent by the transmission node, for performing routing processing by looking at the communication network header of the transferred packet A packet restoration device relay node comprising: a routing processing unit of (1), and a transmission buffer unit for performing a packet transfer process. 7. A reception buffer unit for receiving a packet, a packet identification unit for identifying a stream communication session from an arriving packet, and a packet extracted by the packet identification unit and recorded in a terminal header. A packet restoring unit for restoring a packet group as sent by the transmitting node based on the number of packets before repacketization and the leading sequence number. 8. A step in which a node of the packet switching network identifies at least whether a packet arriving at the node belongs to any session of the stream communication, the number of encoded frames of the packet belonging to one session, and A step of confirming that the data encoding methods are the same, a step of temporarily storing packets for each session, and determining whether the total payload length of the temporarily stored packets exceeds a predetermined threshold value Steps,
Restoring the encoded frames in the payload in the order in which they were generated, and recording the head sequence number and the number of packets before repacketization in the terminal header of the packet after repacketization. A computer-readable program recording medium on which a program is recorded. 9. A node of a packet switching network for identifying at least whether or not an arriving packet belongs to any session of stream communication, and re-encoding the packet based on the content of a terminal header of the packet. A step of determining whether or not packetization processing is applied; and, for a packet to which repacketization processing has been applied, the number of packets before repacketization and the start number recorded in the terminal header. Resetting the terminal header of each packet of the original packet group from the sequence number of the original packet group, allocating the encoded frames equally to each payload, and restoring the packet group as transmitted by the transmitting node. Computer-readable program recording medium on which a program for recording is recorded. 10. A receiving node for identifying at least whether or not an arriving packet belongs to any session of stream communication. Based on the content of a terminal header of the packet, the packet is re-packetized. A step of determining whether or not the processing has been applied; and, for a packet to which the repacketizing processing has been applied, the number of packets before repacketization and the sequence number at the beginning recorded in the terminal header. A program for executing the steps of resetting the terminal header of each packet of the original packet group, equally allocating the encoded frame to each payload, and restoring the packet group as transmitted by the transmission node. Computer-readable program recording medium on which is recorded.