JP2004363674A - Transmission right management apparatus, and transmission right management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional packet communication system (cable modem or the like) that cannot have taken sufficient countermeasures against a packet delay in the case of carrying out packet communication such as an IP phone (VoIP) wherein real time performance is a requirement because of a shared transmission band among packets. <P>SOLUTION: In a transmission right management apparatus, an external reception section 11 receives packets of an external network and an internal reception section 12 receives packets of an internal network, a link establishment/end detection section 13 detects a session establishment completion/end packet in compliance with the signaling protocol (SIP or H.323 or the like). When a detected packet is the session establishment completion packet, a transmission right management section 15 collates address information in the packet with address information of an internal network apparatus, gives a transmission right at an interval shorter than the shortest default transmission interval of each codec system used by the IP phone (VoIP) or the like as a standard system to the adapted apparatus and an internal transmission section 16 informs terminals through the internal network. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission right management device which gives a transmission right of a packet to a device to be accommodated in a packet communication system sharing a transmission band, such as a cable modem, a home LAN system using a coaxial, etc. The present invention relates to a transmission right management device and a transmission right management method capable of managing the transmission right of packet communication.
[0002]
[Prior art]
In recent years, with the speeding up of networks due to the rapid spread of cable modems, ADSL, FTTH, and the like, it has become practically possible to communicate voice information at high speed among a plurality of devices.
[0003]
In particular, VOIP (Voice over Internet Protocol) technology for integrating voice communication by conventional telephone with data communication and transmitting by IP communication has been developed and realized as a product.
[0004]
This VOIP technology is to transmit voice as a frame every short time (for example, about 20 msec) on an IP network, which is a protocol of a network layer used in the Internet, and attach and receive an IP header as an IP packet. .
[0005]
Generally, a telephone call in a VOIP system can be operated at lower cost than a telephone call (voice communication) using a conventional telephone network, and is therefore rapidly spreading.
[0006]
At present, as a signaling protocol for determining an agreement between callers, SIP or ITU-T Recommendation H. 323.
[0007]
Hereinafter, a conventional system for implementing general VOIP communication will be specifically described with reference to the drawings.
[0008]
FIG. 3 is a configuration diagram of a conventional network for realizing general VOIP communication. A VOIP terminal 31 and a VOIP terminal 32 are connected to an IP network 33.
[0009]
FIG. 4 is a configuration diagram of a general VOIP terminal of a conventional example. Reference numeral 41 denotes an IP packet converter for converting a voice signal into an IP packet; 42, a voice converter for converting an IP packet into a voice signal; , A packet transmitting unit for transmitting a packet to an IP network, 45 an IP packet processing unit for performing IP packet processing, 46 a TCP packet processing unit for processing a TCP packet, 47 a UDP packet , A signaling protocol processing unit 48 for processing a signaling protocol, and a media type processing unit 49 for processing a media type transmitted in a signaling protocol packet.
[0010]
The operation of the conventional general voice communication between the VOIP terminal 31 and the VOIP terminal 32 connected to the IP network 33 will be described below.
[0011]
When voice communication is performed from the VOIP terminal 31 to the VOIP terminal 32, first, the VOIP terminal 31 performs a process of transmitting a signaling protocol addressed to the VOIP terminal 32.
[0012]
In the transmission processing of the signaling protocol packet, the signaling protocol processing unit 48 generates a signaling protocol packet including the media type transmitted in the signaling session generated by the media type processing unit 49. When the generated signaling protocol packet is to be transmitted as a TCP packet, the TCP packet processing unit 46 performs a process for the TCP protocol.
[0013]
The details of the process regarding the TCP packet are described in RFC 793, “TRANSMISSION CONTROL PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION”, and thus the detailed description is omitted.
[0014]
In the case of transmitting a UDP packet, the UDP packet processing unit 47 performs processing for the UDP protocol.
[0015]
Note that the details of the process regarding the UCP packet are described in RFC768 “User Datagram Protocol DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION”, and thus the detailed description is omitted.
[0016]
Then, IP protocol processing is performed by the IP packet processing unit 45, and the packet is transmitted to the IP network 33 by the packet transmission unit 44.
[0017]
The details of the process regarding the IP packet are described in RFC 791 “INTERNET PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION”, and thus detailed description is omitted.
[0018]
In the VOIP terminal 32, the packet is received by the packet receiving unit 43 from the IP network 33, and the IP packet processing unit 45 identifies the upper layer protocol carried in the IP packet by the protocol field (8 bits) of the IP packet. Is
[0019]
Next, when the signaling protocol packet received by the IP packet processing unit 45 is identified as a TCP packet, the TCP packet processing unit 46 uses the source port (16 bits) and the destination port (16 bits) of the TCP packet to transmit the TCP packet. The upper layer protocol carried in the device is identified.
[0020]
When the signaling protocol packet received by the IP packet processing unit 45 is identified as a UDP packet, the UDP packet processing unit 47 uses the source port (16 bits) and the destination port (16 bits) of the UDP packet to transmit the UDP packet. The identification processing of the upper layer protocol carried by is performed.
[0021]
When the TCP packet processing unit 46 or the UDP packet processing unit 47 identifies the packet as a signaling protocol packet, the signaling protocol processing unit 48 performs a process on the signaling protocol. Further, the processing on the media type transmitted in the signaling session of the signaling protocol packet is performed by the media type processing unit 49.
[0022]
In a similar manner, a process of transmitting a signaling protocol packet from the VOIP terminal 32 to the VOIP terminal 31 is also performed, and signaling between the VOIP terminal 31 and the VOIP terminal 32 is performed.
[0023]
A processing sequence when the SIP protocol (Session Initiation Protocol) is used as the signaling protocol is as shown in FIG. 5, for example.
[0024]
More specifically, the VOIP terminal 31 sends the VOIP terminal 32 a request to the VOIP terminal 32 as a connection setting request including conditions (such as the voice encoding method, the IP address, and the port number of the VOIP terminal 31) that can be used in the VOIP communication. An Invite message (51) is transmitted with the IP address as the destination.
[0025]
In this case, the VOIP terminal 31 needs to know the IP address of the VOIP terminal 32. Here, for simplicity of description, it is assumed that the VOIP terminal 31 knows the IP address in advance. The method of obtaining the IP address when the user does not know the IP address is well known in the related art, and is described in the SIP document.
[0026]
Upon receiving the Invite message (51), the VOIP terminal 32 determines whether a connection can be made. If the connection can be made, the VOIP terminal 32 sends a connection condition (speech coding method, port number, etc.) of the VOIP terminal 32 to the OK message (52). ) To the VOIP terminal 31. The VOIP terminal 31 transmits an ACK message (53) to the VOIP terminal 32 to confirm the reception of the OK message (52). According to the above procedure, information for performing VOIP communication between the VOIP terminal 31 and the VOIP terminal 32 is completed on both sides.
[0027]
Thereafter, both VOIP terminals 31 and 32 start transmitting audio signals to the destination IP address and the destination port number obtained in the above procedure.
[0028]
To release the connected call, one of the VOIP terminals 31 and 32 sends a release request Bye message (54) to the VOIP terminal of the other party, and stops sending voice. When receiving the Bye message (54), the other party's VOIP terminal stops sending the voice and sends an OK message (55) of the release request response. As a result, the resources used for the call connection are released, and the call connection can be terminated.
[0029]
If the VOIP terminal that has requested the release cannot receive the release request response OK message (55) within a predetermined time, it sends out the release request Bye message (54) again. As a result, even if the message is lost, the call connection can be reliably released.
[0030]
In addition, as a signaling protocol, ITU-T Recommendation H. A processing sequence when using H.323 is, for example, as shown in FIG.
[0031]
More specifically, the VOIP terminal 31 sends the SETUP message (61) of the call setting request to the VOIP terminal 32 with the IP address of the VOIP terminal 32 as a destination.
[0032]
In this case, the VOIP terminal 31 needs to know the IP address of the VOIP terminal 32, but it is assumed here that the IP address is known in advance for the sake of simplicity, as in the case of the SIP described above. A method of obtaining an IP address when the IP address is not known is well known in the related art. It is also described in the H.323 document.
[0033]
Upon receiving the Setup message (61) of the call setting request from the VOIP terminal 31, the VOIP terminal 32 determines whether or not the connection can be established. If the connection can be established, the Connect message (62) of the response including the port number and the like to the terminal A (62) return it. Upon receiving the response Connect message (62), the terminal A recognizes that the connection agreement has been obtained with the partner terminal.
[0034]
Next, the VOIP terminal 31 transmits the connection setting request including the conditions (the voice encoding method and the port number of the VOIP terminal 31) that can be used in the VOIP communication to the IP address of the VOIP terminal 31 notified in the above procedure. An Open Logical channel message (63) is sent to the port number as the destination. Upon receiving the message, the VOIP terminal 32 determines whether the voice coding method on the VOIP terminal 32 side matches the requested coding method, etc., and if voice communication is possible, the IP address and the voice port An information (Open Logical channel Ack message (64)) necessary for voice communication such as a number is transmitted to the VOIP terminal 31.
[0035]
As described above, information for performing voice communication between the VOIP terminals 31 and 32 is completed on both sides.
[0036]
To release the connected call, either of the VOIP terminals 31 and 32 sends a release request Release message (65) to the other party's VOIP terminal and instructs to stop sending voice. When receiving the Release message (65), the partner terminal instructs to stop the voice transmission and transmits a Release Ack message (66) of the release request response. As a result, the resources used for the call connection are released, and the call connection can be terminated.
[0037]
If the VOIP terminal that has requested the release cannot receive the Release Ack message (66) of the release request response within a predetermined time, it sends out the Release message (65) of the release request again. Thus, even if the Release Ack message is lost, the connection of the call can be reliably released.
[0038]
As described above, in the conventional VOIP communication, a VOIP terminal transmits and receives a control signal between terminals to establish a connection. In this case, the VOIP terminal only needs to be connected to the IP network. Therefore, there is an advantage that connection control can be performed without depending on a telephone company, and a flexible service can be provided. Further, the function for realizing VOIP communication can be used in common with the function for realizing data communication on the IP network, and the cost for realizing services can be reduced.
[0039]
Further, as a conventional technique, there is Patent Document 1, which does not convert voice into IP in a terminal but uses a device centrally installed near an IP network to obtain voice due to delay of an IP packet. A technique for avoiding quality deterioration is disclosed.
[0040]
[Patent Document 1]
JP 2002-141938 A
[0041]
[Problems to be solved by the invention]
However, in the conventional VOIP communication system as described above, humans are sensitive to voice quality, and high quality communication is required to avoid voice quality deterioration due to delay of IP packets and the like. However, conventionally, there is a problem that measures for delay of the IP packet are insufficient and high-quality voice communication cannot be performed. In particular, in a packet communication system such as a cable modem, since the bandwidth is shared, the voice quality is greatly deteriorated due to the delay of the IP packet.
[0042]
Also, when performing band allocation for performing packet communication requiring real-time performance such as voice communication in a section where a band is shared, processing load due to packet analysis processing and band allocation processing is performed in a section where a band is shared. However, there has been a problem that efficient communication cannot be performed.
[0043]
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a transmission right management device that manages a transmission right of a packet in a section sharing a band in a section sharing a band, and detects a session establishment completion / end packet of a signaling protocol from a detection of a packet. An object of the present invention is to provide a high-quality packet communication by managing the transmission right of a packet to reduce the processing load in packet analysis and bandwidth allocation.
[0044]
[Means for Solving the Problems]
In order to solve the above problems, a first aspect of the present invention provides an external receiving unit that receives a packet from an external network, an internal receiving unit that receives a packet from an internal network, the external receiving unit and the internal receiving unit. A link establishment detection unit for detecting a session establishment completion packet of a signaling protocol from a received packet, address information in the session establishment completion packet detected by the link establishment detection unit, and address information of a device accommodated in an internal network A link information detecting unit for comparing with the link information detecting unit, a transmission right management unit for creating transmission right information for giving a transmission right of a packet at an interval shorter than a default transmission interval to the device adapted by the link information detecting unit, the transmission right management unit Transmission comprising an internal transmission unit for transmitting the transmission right information created in the above to the terminal. It is a management device.
[0045]
A second invention includes a link end detecting unit that detects a session end packet of a signaling protocol from packets received by the external receiving unit and the internal receiving unit, wherein the link information detecting unit includes the link end detecting unit. Comparing the address information in the session end packet detected in step 1 with the address information of the device accommodated in the internal network, and the transmission right management unit stops the assignment of the transmission right to the matched device. Is a transmission right management device according to the first invention.
[0046]
A third invention is the transmission right management device according to any one of the first invention and the second invention, wherein the packets received by the external receiving unit and the internal receiving unit are IP packets. .
[0047]
In a fourth aspect, the signaling protocol detected by the link establishment detecting unit and the link end detecting unit is SIP (Session Initiation Protocol) and H.264. 323 is a transmission right management device according to any one of the first invention and the second invention, which is based on at least one type of communication procedure.
[0048]
In a fifth aspect, the address information collated by the link information detection unit is at least one of a destination and a source address of an IP (Internet Protocol) packet, and a destination and a source address of a MAC address. A transmission right management apparatus according to any one of the first and second aspects of the invention.
[0049]
According to a sixth aspect of the present invention, the standard codec system in the transmission right management unit is the one described in Recommendation G. 711, G723.1, G.I. 726, G.R. 728, G.R. 729 is a transmission right management apparatus according to any one of the first invention and the second invention.
[0050]
A seventh invention is an external receiving step for receiving a packet from an external network, an internal receiving step for receiving a packet from an internal network, and establishing a session of a signaling protocol from the packets received in the external receiving step and the internal receiving step. A link establishment detecting step of detecting a completion packet, a link information detecting step of comparing address information in the session establishment completion packet detected in the link establishment detecting step with address information of a device accommodated in an internal network, A transmission right management step of creating transmission right information for giving a packet transmission right to the device adapted in the link information detection step at an interval shorter than a default transmission interval; and transmitting the transmission right information created in the transmission right management step to the terminal. Internal sending A transmission right managing method characterized in that it comprises a-up.
[0051]
An eighth invention includes a link end detecting step of detecting a session end packet of a signaling protocol from packets received by the external receiving unit and the internal receiving unit, and the link information detecting step includes the link end detecting step Comparing the address information in the session end packet detected in the above with the address information of the device accommodated in the internal network, and wherein the transmission right management step stops the assignment of the transmission right to the adapted device. Is a transmission right management method according to the seventh aspect of the present invention.
[0052]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0053]
FIG. 1 is a configuration block diagram of a transmission right management device according to an embodiment of the present invention.
[0054]
In the figure, 11 is an external receiving unit for receiving a packet from an external network, 12 is an internal receiving unit for receiving a packet from an internal network, 13 is a signaling protocol for packets received by the external receiving unit 11 and the internal receiving unit 12. A link establishment / end detection unit 14 for detecting the session establishment completion packet and the session end packet of the network establishment unit 14 detects the session establishment completion packet and the address information in the session end packet detected by the link establishment / end detection unit 13 and the internal network. A link information detection unit 15 for checking the address information of the device accommodated in the internal network by the link information detection unit 14 and a packet detected by the link establishment / end detection unit 13 to a compatible device accommodated in the internal network. Is the session establishment complete packet, the standard codec A transmission right management unit which gives a transmission right of the packet at an interval shorter than the default transmission interval of the system and stops the assignment of the transmission right of the packet when the packet detected by the link establishment / end detection unit 13 is a session end packet, and 16 The internal transmission unit transmits the transmission right of the packet to a suitable device accommodated in the internal network at the transmission interval allocated by the right management unit 15.
[0055]
FIG. 2 is a configuration block diagram of the packet communication system according to the embodiment of the present invention.
[0056]
In the figure, 21 is an external network, 22 is an internal network, 23 is a transmission right management device that manages the transmission right of packets in the internal network, 241 to 24n are VOIP terminals connected to the external network 21, and 251 to 25n are internal networks 22 Is a VOIP terminal connected to, and 26 is a band sharing communication system.
[0057]
As an example of the operation of the transmission right management device 23, a case where the VOIP terminal 241 on the external network 21 and the VOIP terminal 251 on the internal network 22 perform voice communication using the SIP protocol will be described using a specific example.
[0058]
The processing sequence when the SIP protocol is used has, for example, the same processing sequence configuration as that of the conventional example shown in FIG. 5, and a description thereof will be omitted.
[0059]
The transmission right management device 23 receives a packet from the external network 21 by the external receiving unit 11. The internal receiving unit 12 receives a packet from the internal network 22. In the received packet, the link establishment / end detection unit 13 detects the session establishment completion packet (ACK message (53)) and the session establishment end packet (release request response OK message (55)) of the signaling protocol.
[0060]
When the session establishment completion packet is detected, the link information detection unit 14 detects the address information (the destination IP address when the packet is received from the external network 21 and the internal network) in the detected session establishment completion packet (ACK message (53)). When the information is received from the internal network 22, the source IP address is compared with the address information (IP address) of the VOIP devices (251 to 25n) accommodated in the internal network 22.
[0061]
In the case of detecting the establishment of a link from the VOIP device 241 to the VOIP device 251, the transmission right management unit 15 sends the VOIP device 251 a standard codec method (for example, Recommendations G.711, G723.1, G.726, G.728, G .729), the right to transmit packets to the internal network 22 is given at intervals shorter than the default transmission interval (20 ms).
[0062]
Then, the internal transmission unit 16 transmits information notifying the transmission right of the packet to the VOIP device 251 at the transmission interval assigned by the transmission right management unit 15.
[0063]
If a session establishment completion packet is detected, the address information of the detected session establishment completion packet (OK message (55) of the release request response) (the destination IP address if the packet is received from the external network 21, When received, the source IP address is collated with the address information (IP address) of the VOIP devices (251 to 25n) accommodated in the internal network 22.
[0064]
In the case of detecting the end of the establishment of the link from the VOIP device 241 to the VOIP device 251, the transmission right management unit 15 stops the allocation of the packet transmission right to the internal network to the VOIP device 251.
[0065]
As an example of the operation of the transmission right management device 23, the VOIP terminal 241 on the external network 21 and the VOIP terminal 251 on the internal network 22 are in accordance with ITU-T Recommendation H.264. A case where voice communication is performed using H.323 will be described using a specific example.
[0066]
ITU-T Recommendation H. The processing sequence when using H.323 is, for example, the same processing sequence configuration as that of FIG. 6 of the conventional example, and the description thereof will be omitted.
[0067]
The transmission right management device 23 receives a packet from the external network 21 by the external receiving unit 11. The internal receiving unit 12 receives a packet from the internal network 22. In the received packet, the link establishment / end detection unit 13 detects a session establishment completion packet (Open Logical channel Ack message (64)) and a session establishment end packet (Release Ack message (66)) of the signaling protocol.
[0068]
When the session establishment completion packet is detected, the link information detection unit 14 uses the detected session establishment completion packet (Open Logical channel Ack message (64)) for address information (when the packet is received from the external network 21, the destination IP address). The address, the destination IP address when received from the internal network 22, and the address information (IP address) of the VOIP devices (251 to 25n) accommodated in the internal network 22 are collated.
[0069]
In the case of detecting the establishment of a link from the VOIP device 241 to the VOIP device 251, the transmission right management unit 15 sends the VOIP device 251 a standard codec method (for example, Recommendations G.711, G723.1, G.726, G.728, G .729), the right to transmit packets to the internal network 22 is given at intervals shorter than the default transmission interval (20 ms).
[0070]
Then, the internal transmission unit 16 transmits information notifying the transmission right of the packet to the VOIP device 251 at the transmission interval assigned by the transmission right management unit 15.
[0071]
Also, when a session establishment completion packet is detected, the address information of the detected session establishment completion packet (Release Ack message (66)) (the destination IP address when the packet is received from the external network 21, and the address information when the packet is received from the internal network 22) Performs collation between the source IP address and the address information (IP address) of the VOIP devices (251 to 25n) accommodated in the internal network 22.
[0072]
In the case of detecting the end of the establishment of the link from the VOIP device 241 to the VOIP device 251, the transmission right management unit 15 stops the assignment of the transmission right of the packet to the internal network 22 to the VOIP device 251.
[0073]
In this way, the right to transmit a packet to the VOIP device 251 of the internal network 22 that is performing communication during voice communication is managed, and voice communication is performed between the VOIP terminal 241 and the VOIP device 251.
[0074]
Although the present invention has been described in the case of voice (VOIP) communication, it is easier to understand the description focusing on voice communication, and the present invention is intended to be applied to general media communication including voice communication. And Voice communication is also one form of media communication, so its extension can be easily understood. That is, the present invention is not limited to voice (VOIP) communication.
[0075]
As described above, according to the present embodiment, a session establishment completion / end packet of a signaling protocol is provided in a transmission right management device that manages a transmission right of a packet in a section sharing a band in a section sharing a band. By managing the transmission right of the packet from the detection of the packet, the processing load in the packet analysis and the bandwidth allocation can be reduced, and high-quality media communication can be performed.
[0076]
【The invention's effect】
According to the present invention, when a packet is received by the transmission right management device, the transmission right is managed by detecting the session establishment completion / end packet of the signaling protocol to manage the transmission right of the packet, thereby delaying the IP packet. By avoiding quality deterioration, high quality and high transmission efficiency media communication becomes possible.
[Brief description of the drawings]
FIG. 1 is a configuration block diagram of a transmission right management apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration block diagram of a packet communication system according to the embodiment of the present invention;
FIG. 3 is a configuration diagram of a network that realizes general VOIP communication in a conventional example.
FIG. 4 is a configuration diagram of a general VOIP terminal of a conventional example.
FIG. 5 is a diagram showing a processing sequence when the SIP protocol is used;
[Fig. 6] ITU-T Recommendation H. Showing a processing sequence when using H.323
[Explanation of symbols]
11 External receiver
12 Internal receiver
13 Link establishment / termination detector
14 Link information detector
15 Transmission Right Management Department
16 Internal transmitter
21 External network
22 Internal Network
23 Transmission right management device
26 Bandwidth sharing communication system
31, 32, 241-24n, 251-25n VOIP terminal
33 IP network
41 IP packet converter
42 sound converter
43 packet receiver
44 packet transmitter
45 IP packet processing unit
46 TCP packet processing unit
47 UDP packet processing unit
48 Signaling Protocol Processing Unit
49 Media Type Processing Unit
51 Invite message
52, 55 OK message
53 ACK message
54 Bye message
61 Setup message
62 Connect message
63 Open Logical channel message
64 Open Logical channel Ack message
65 Release message
66 Release Ack message

Claims (8)

An external receiving unit that receives a packet from an external network,
An internal receiving unit that receives packets from the internal network,
From the packets received by the external receiving unit and the internal receiving unit, a link establishment detection unit that detects a session establishment completion packet of the signaling protocol,
A link information detection unit that performs a check on the address information in the session establishment completion packet detected by the link establishment detection unit with the address information of a device housed in an internal network;
A transmission right management unit that creates transmission right information that gives a transmission right of a packet at an interval shorter than a default transmission interval to the device adapted by the link information detection unit,
A transmission right management device, comprising: an internal transmission unit that transmits transmission right information created by the transmission right management unit to the terminal. From a packet received by the external receiving unit and the internal receiving unit, comprising a link end detection unit that detects a session end packet of the signaling protocol,
The link information detection unit compares the address information in the session end packet detected by the link end detection unit with the address information of the device accommodated in the internal network,
The transmission right management device according to claim 1, wherein the transmission right management unit creates transmission right information for stopping assignment of the transmission right to the adapted device. 3. The transmission right management device according to claim 1, wherein the packets received by the external receiving unit and the internal receiving unit are IP packets. The signaling protocols detected by the link establishment detection unit and the link end detection unit are SIP (Session Initiation Protocol) and H.264. The transmission right management device according to claim 1, wherein the transmission right management device conforms to at least one communication procedure among H.323. The address information collated by the link information detection unit is at least one of a destination and a source address of an IP (Internet Protocol) packet, and a destination and a source address of a MAC address. The transmission right management device according to claim 1. The standard codec system in the transmission right management unit is described in Recommendation G. 711, G723.1, G.I. 726, G.R. 728, G.R. 729. The transmission right management apparatus according to claim 1, wherein the transmission right management apparatus is at least one of 729. An external receiving step of receiving a packet from an external network,
An internal receiving step of receiving a packet from the internal network,
From the packets received in the external receiving step and the internal receiving step, a link establishment detecting step of detecting a session establishment completion packet of a signaling protocol,
A link information detecting step of comparing address information in the session establishment completion packet detected in the link establishment detecting step with address information of a device accommodated in an internal network;
A transmission right management step of generating transmission right information that gives a transmission right of a packet at an interval shorter than a default transmission interval to the device adapted in the link information detection step;
A transmission right management method comprising an internal transmission step of transmitting the transmission right information created in the transmission right management step to the terminal. From the packet received by the external receiving unit and the internal receiving unit, comprising a link end detection step of detecting a session end packet of the signaling protocol,
The link information detection step performs a comparison between the address information in the session end packet detected in the link end detection step and the address information of the device accommodated in the internal network,
8. The transmission right management method according to claim 7, wherein the transmission right management step creates transmission right information for stopping assignment of the transmission right to the adapted device.

Images