JP7401097B2 - IP broadcast system, IP gateway device, management node device, client device and method - Google Patents

Description

The present invention relates to an IP broadcast system, an IP gateway device, a management node device, a client device, and a method.

Many existing broadcast stations have dedicated networks for transmitting broadcast material such as video, audio, and ancillary data within the station. Various devices are connected to the dedicated network, such as a capture device such as a camera and a microphone, a storage server that stores content data, a playback device that plays the content, and a gateway device that converts the format of the transmitted signal. SDI (Serial Digital Interface) has been widely used as a signal format for transmitting broadcast material over a dedicated network.

However, as a result of the remarkable performance improvement of IP (Internet Protocol) technology in recent years, broadcasters have discovered the merits of utilizing more versatile IP technology and are working to update their internal networks to IP networks. It started. By adopting an IP-based network architecture, it becomes possible to construct a high-speed, large-capacity network at low cost using, for example, network devices such as general-purpose routers and switches.

Standardization of protocols for transmitting broadcast materials using IP technology is also currently underway. For example, SMPTE (Society of Motion Picture and Television Engineers) has standardized SMPTE ST2022-6, which is a protocol for transmitting SDI images, which are a mixture of video, audio, and auxiliary data, in IP packets (non-patent (See Reference 1). Furthermore, SMPTE is also proceeding with the standardization of the SMPTE ST2110 series, which is a protocol group for transmitting video, audio, and auxiliary data in separate streams (see Non-Patent Document 2).

ARIB (Association of Radio Industries and Businesses), a standardization organization in Japan, has standardized ARIB STD-B73 as a data structure specification for transmitting video, audio, and auxiliary data in a single stream. (See Non-Patent Document 3).

Furthermore, as the use of IP advances, it is expected that a variety of devices will be connected to the network of the broadcasting station system. To ensure interoperability between such diverse devices, the Advanced Media Workflow Association (AMWA) has developed Networked Media Workflow Association (NMOS), a collection of control interface standards for managing and controlling the transmission of streams between devices. We are proceeding with the formulation of standards (Open Specifications). For example, NMOS IS-04 is a control interface standard for discovery and registration of network resources (see Non-Patent Document 4). NMOS IS-05 is a control interface standard for device connection management (see Non-Patent Document 5).

Further, Patent Document 1 describes a technology in which a home router that constitutes an IP network converts the data format (MPEG, WMV, etc.) of announcement broadcast data from a server into a data format that can be received by a terminal device. . Additionally, Patent Document 2 describes a technology in which a media converter on a network converts the data format (MPEG2, etc.) of data sent from a server into a data format (MPEG4, etc.) that can be processed by a client and transmits the converted data. has been done. Further, Patent Document 3 describes that when sharing data in a remote control system, by receiving data having reproducible data information (or data specifying information that specifies the data) from multiple remote control devices, Techniques are described to prevent sharing of data that cannot be reproduced.

Thomas Edwards, “SMPTE ST 2022: Moving Serial Interfaces (ASI & SDI) to IP”, [online], August 17, 2017, SMPTE Standards Webcast Series, [searched on February 15, 2019], Internet < URL : https://www.smpte.org/sites/default/files/2017-08-17-ST-2022-Edwards-V4-Handout.pdf SMPTE, “SMPTE ST 2110 FAQ”, [online], [searched on February 15, 2019], Internet <URL: https://www.smpte.org/st-2110> ARIB, “Data structure standard for essence-independent single stream RTP datagram in production IP interface (ARIB STD-B73 1.0 version)”, [online], July 26, 2018, [February 15, 2019 ], Internet <URL: https://www.arib.or.jp/kikaku/kikaku_hoso/desc/std-b73.html> AMWA, “AMWA IS-04 NMOS Discovery and Registration Specification (Stable)”, [online], [February 15, 2019], Internet <URL: https://amwa-tv.github.io/nmos-discovery -registration/＞ AMWA, “AMWA IS-05 NMOS Device Connection Management Specification”, [online], [February 15, 2019], Internet <URL: https://amwa-tv.github.io/nmos-device-connection- management/＞

JP2005-229296A Japanese Patent Application Publication No. 2002-152301 Japanese Patent Application Publication No. 2010-004401

In IP broadcasting systems, general-purpose network switches (such as COTS (Commercial Off-The-Shelf)) are used as IP routers, so any broadcasting equipment that supports the NMOS standard can be connected to a general-purpose network. . That is, it is expected that various devices will be connected to the IP broadcast system network.

However, it is not always guaranteed that the operation modes of the various devices that transmit or receive streams will be the same between the transmitter and the receiver. If streams from devices whose operating modes (4K mode, 3G mode, HD mode, etc.) do not match are sent from the sender to the receiver, network resources will be wasted and unexpected malfunctions will occur on the receiver. may also be triggered. In particular, in NMOS, the transmission specifications of the operation mode between transmitter and receiver are undefined.

The present disclosure aims to provide a mechanism for realizing appropriate and efficient stream switching control in an IP broadcast system network.

The IP broadcast system disclosed in the present application includes at least one IP gateway device that operates as a receiver on an IP network and is capable of performing IP-based message exchange according to NMOS. The IP gateway device includes a first storage unit and a registration message generation unit. Receiver information including information on the operation mode of the device itself is stored in the first storage section. The registration message generation unit reads the receiver information from the first storage unit, and generates and transmits a registration message in which the receiver information is described.

The IP gateway device disclosed in this application operates as a receiver on an IP network and is capable of exchanging IP-based messages according to NMOS. Further, the IP gateway device includes a storage unit and a registration message generation unit. The storage unit stores receiver information including information on the operation mode of the device itself. The registration message generation unit reads the receiver information from the storage unit, and generates and transmits a registration message in which the receiver information is described.

The management node device disclosed in the present application includes at least one sender that transmits or publishes sender information including information on the operation mode of the own device according to NMOS, and a registration message in which receiver information including information on the operation mode of the own device is described. An IP broadcast system is configured with at least one receiver that transmits. The management node device includes a storage unit and a registration unit. The sender information is stored in the storage unit as registered information. Each time the registration unit receives the registration message from a receiver connected to an IP network, the registration unit extracts the receiver information from the registration message and stores the receiver information as the registration information in the storage unit.

A client device disclosed in the present application includes at least one sender that transmits or publishes sender information including information on the operation mode of the own device according to NMOS, and a registration message in which receiver information including information on the operation mode of the own device is described. and a management node device that registers the sender information and the receiver information described in the registration message as registration information, and transmits a notification message describing the registration information each time the registration information is registered. It is also an NMOS client device that constitutes an IP broadcast system. The client device includes a storage section, a registration section, a comparison section, and a control message generation section. The registration information is stored in the storage unit. Each time the registration unit receives the notification message, the registration unit extracts the registration information from the notification message and stores the registration information in the storage unit. When receiving a stream switching instruction, the comparison unit compares information on an operation mode of a sender that is a source of the stream and information on an operation mode of a receiver that is a destination of a stream based on the registration information. compare. The control message generation unit generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the comparison unit.

The method disclosed in the present application includes a first transmission step in which at least one sender transmits or publishes sender information including information on the operation mode of the own device according to NMOS, and at least one receiver transmits or publishes sender information including information on the operation mode of the own device; a second transmission step of transmitting a registration message in which receiver information including information is described; and a management node device that manages transmission of at least one stream set up between the sender and the receiver; a first registration step of registering the information as registration information; each time the management node device receives the registration message from a receiver connected to an IP network, the management node device extracts the receiver information from the registration message; a second registration step of registering the information as the registration information.

According to the IP broadcast system, IP gateway device, management node device, client device, and registration method disclosed in this application, appropriate and efficient stream switching control can be realized in the network of the IP broadcast system.

FIG. 1 is a schematic diagram showing an example of the configuration of an IP broadcast system 1 according to an embodiment of the present disclosure. FIG. 2 is a diagram showing an example of the logical configuration of the IP domain 10 of the IP broadcasting system 1 shown in FIG. 1. FIG. 3 is an explanatory diagram showing an example of a registration message for registering an existing node transmitted using HTTP. FIG. 4 is a diagram showing an example of a schematic configuration of the IP broadcasting system 1 for realizing switching control according to the first embodiment. FIG. 5 is a block diagram showing an example of the configuration of the IP gateway 100b according to the first embodiment. FIG. 6 is a diagram showing an example of Receiver information written in the message body 54 of the registration message 51. FIG. 7 is a diagram showing an example of Sender information written in the message body 54 of the registration message 51. FIG. 8 is a diagram showing an example of Flow information written in the message body 54 of the registration message 51. FIG. 9 is a diagram showing an example of Sender information written in SDP format. FIG. 10 is a block diagram showing an example of the configuration of the IP controller 200 according to the first embodiment. FIG. 11 is a sequence diagram showing a registration sequence of registration information regarding a node. FIG. 12 is a diagram showing an example of a notification message (IS-04 registration information notification) in which Receiver information is described. FIG. 13 is a block diagram showing an example of the configuration of the APS 300 according to the first embodiment. FIG. 14 is a diagram showing an example of a schematic configuration of an IP gateway 500 of an IP broadcast system according to the second embodiment.

Embodiments of an IP broadcast system, an IP gateway device, a management node device, a client device, and a method disclosed in the present application will be described in detail below based on the drawings. Note that the present invention is not limited to this embodiment. Further, in the specification and drawings of the present application, elements that can be explained in the same manner can be designated by the same reference numerals so that repeated explanation can be omitted.

The explanation will be given in the following order.
1. Overview 1.1. System configuration example 1.2. Example of HTTP-based control message 1.3. Explanation of the task 2. First embodiment 2.1. System configuration 2.2. IP gateway configuration 2.3. IP controller configuration 2.4. APS configuration 2.5. Technical characteristics 3. Modification of the first embodiment 4. Second embodiment 4.1. System configuration 4.2. Technical features

<1. Overview＞
<1.1. System configuration example>
First, using FIG. 1, an overview of an IP broadcasting system to which an embodiment of the present disclosure can be applied will be described. FIG. 1 is a schematic diagram showing an example of the configuration of an IP broadcast system 1 according to an embodiment of the present disclosure. Referring to FIG. 1, the IP broadcast system 1 includes one or more network devices 12, a camera 14, a monitor 16, a configuration terminal 18, a camera 22, a microphone 24, a data server 26, an integrated playout 32, a monitor 34, at least one IP gateway 100a, at least one IP gateway 100b, a management node 200, and an APS 300. The network device 12, camera 14, monitor 16, setting terminal 18, IP gateway 100a, IP gateway 100b, management node 200, and APS 300 belong to the IP domain 10.

(1) Description of each device The network device 12 is a device in charge of transferring streams in an IP network. Each of network devices 12 may be any type of network device, such as, for example, a router, switch, bridge, or repeater. Each of the network devices 12 may be a general-purpose product (eg, COTS) that can be introduced at low cost. Further, the network device 12 may be an IP router 12 described later. Although four network devices 12 are shown in FIG. 1, the IP broadcast system 1 may include any number of network devices 12 without being limited to such an example. IP domain 10 may consist of a single network or may include multiple subnetworks.

Camera 14 is a type of capture device that generates broadcast material. For example, the camera 14 photographs some object and generates video data. The camera 14 may acquire audio through a built-in microphone to generate audio data. Camera 14 belongs to IP domain 10 and is capable of packetizing data streams of video and audio data into a series of IP packets and transmitting them to an IP network.

The monitor 16 is a type of playback device that receives broadcast material and plays back the content. For example, the monitor 16 receives video data and plays the video. The monitor 16 may receive audio data and reproduce the audio. The monitor 16 may receive additionally transmitted auxiliary data and process the auxiliary data (eg, play subtitles). The monitor 16 may provide the user with editing functionality for editing content. The monitor 16 belongs to the IP domain 10 and can receive a series of IP packets transferred on the IP network.

The setting terminal 18 is a terminal device that provides a user interface related to the operation of the IP broadcasting system 1 to the user. The setting terminal 18 may be a user terminal dedicated to the IP broadcast system 1, or may be a general-purpose terminal such as a PC (Personal Computer) or a smartphone. The configuration terminal 18 acquires, for example, information that can be set by the user among information related to nodes belonging to the IP domain 10 via the user interface, and transmits the acquired information to the management node 200. Further, the setting terminal 18 receives, for example, a request to transmit a stream between given devices via a user interface, and sends a request message to the management node 200.

IP gateway 100a is at least one gateway device located at the border between IP domain 10 and other signaling domains. IP gateway 100a connects to one or more network devices 12. In the example of FIG. 1, a camera 22, a microphone 24, and a data server 26 are further connected to the IP gateway 100a. For example, IP gateway 100a may receive SDI signals carrying video data from camera 22. IP gateway 100a may also receive SDI signals carrying audio data from microphone 24. IP gateway 100a may also receive SDI signals from data server 26 carrying one or more of video data, audio data, and auxiliary data. Note that the signal format of the signal transmitted outside the IP domain 10 may be any derivative of SDI, such as SD-SDI, HD-SDI, 3G-SDI, 6G-SDI, or 12G-SDI, for example. Alternatively, a signal format other than SDI may be used. As described above, the IP gateway 100a multiplexes or demultiplexes the signals carrying broadcast material received from the camera 22, the microphone 24, and the data server 26 as necessary, and then packetizes the signals into a series of IP packets. It can be sent to an IP network.

IP gateway 100b is also at least one gateway device located at the boundary between IP domain 10 and other signaling domains. IP gateway 100b connects to one or more network devices 12. In the example of FIG. 1, an integrated playout 32 and a monitor 34 are further connected to the IP gateway 100b. For example, the IP gateway 100b receives IP packets transferred on an IP network, converts the IP packets into SDI signals (or signals in other signal formats), and sends the IP packets to one of the integrated playout 32 and the monitor 34. Or it can be sent to both parties. Note that, of course, the IP gateway 100a may have a function of converting IP packets into SDI signals similarly to the IP gateway 100b. Further, the IP gateway 100b may have a function of converting SDI signals into IP packets similarly to the IP gateway 100a.

The management node 200 is an information processing device that manages information related to nodes belonging to the IP domain 10 and transmission of streams between nodes. For example, when the management node 200 detects that some device is connected to the IP network, it acquires the identification information, address information, and other attribute information of the device, and uses the acquired information (inside the management node 200 or (external) database. The management node 200 also receives messages (e.g., heartbeat or status messages) sent periodically from each of the registered devices belonging to the IP domain 10, thereby determining the status of each device (e.g., connected status). , disconnection or failure). Further, when the management node 200 receives a control message requesting transmission of a stream from the APS 300 or the setting terminal 18 (these are also referred to as higher-level devices), the management node 200 sets up transmission of the requested stream. Additionally, management node 200 may provide further functionality such as alarm output, log management, and performance monitoring. Furthermore, the management node 200 may operate as the NMOS standard IP controller 200 of the first embodiment described later, and for example, the management node 200 may operate as the NMOS standard IP controller 200 of the first embodiment described below. I will do it. Further, the IP controller 200 operates as a device that generates and transmits a control message (a control message compliant with IS-05) in order to switch streams (video data, audio data, auxiliary data), that is, a device that performs switching control. It may also be a thing.

The APS 300 may be, for example, one of NMOS's IS-05 Clients, and is a system that progresses the broadcast of television programs according to a predetermined schedule. For example, the APS 300 may send a control message to the management node 200 to cause the data stream output from a given source (e.g., a camera and microphone, or a data server) to be transmitted to the integrated playout 32 at a predetermined time. . The integrated playout 32 that has received the data stream sends out a broadcast signal of the television program to the antenna through the broadcast station's line. The data stream may also be distributed to, for example, monitor 16 or monitor 34, and the broadcast content may be played within the broadcast station. The APS 300 also operates as a device that generates and transmits a control message (IS-05 compliant control message) for switching streams (video data, audio data, auxiliary data), that is, a device that performs switching control. You can also do it.

(2) IP Multicast While the exchange of control messages within the IP domain 10 of the IP broadcast system 1 may be performed by unicast, the transmission of streams carrying broadcast materials is typically performed by multicast. The source IP address of a multicast packet is the IP address of the sending node, and the destination IP address is a multicast address belonging to a specific address range. A set of nodes that receive multicast packets destined for individual multicast addresses is called a multicast group, and the multicast address is also called a group address. A receiving node that intends to receive a certain stream sends a message (eg, IGMP (Internet Group Management Protocol) JOIN) to neighboring routers notifying it of joining a multicast group corresponding to the stream. Then, messages are exchanged between the routers to update the multicast tree, and the stream sent from a specific sending node is delivered to the receiving node via the IP network. When a receiving node finishes receiving a multicast stream, it sends a message to nearby routers notifying it of leaving the multicast group. Note that the technology according to the present disclosure is not limited to the example described above, and can also be applied to a case where a stream is transmitted by unicast.

(3) Essence and Stream As described above, the content of a television program is generally composed of three types of broadcast material data: video data, audio data, and auxiliary data. In this specification, the term "essence" is used to distinguish the types of broadcast materials and refer to the constituent elements of these contents. In other words, the essence is the broadcast material expressed as data. When an essence is to be transmitted over an IP network, it is converted into a digital signal and packetized according to some IP-based protocol. A common port number is assigned to a series of IP packets carrying the essence in units of streams. That is, a stream may be a sequence of IP packets with a common IP address and port number.

(4) Stream types for each protocol When SMPTE ST2022-6 is used as a protocol for stream transmission, this protocol maps SDI signals directly to IP packets, so different types of essences can be contained in a single stream. Mixed. When the SMPTE ST2110 series is utilized, different types of essence are carried by different streams, so a single stream contains only a single type of essence. When ARIB STD-B73 is used, different types of essences are mixed in a single stream, but unlike SDI images, blanking periods are not included. In either protocol, packets are transmitted according to RTP (Real-time Transport Protocol) in the application layer and UDP (User Datagram Protocol) in the transport layer.

(5) Example of logical configuration of IP domain FIG. 2 is a diagram showing an example of the logical configuration of the IP domain 10 of the IP broadcasting system 1 shown in FIG. 1. Referring to FIG. 2, the first node (node #1) corresponding to the camera 14 includes a sender 60a. A "sender" is a functional entity that has the ability to send a stream. The second node (node #2) corresponding to the IP gateway 100a includes senders 60b and 60c, and the third node (node #3) corresponding to the IP gateway 100a includes a sender 60d. Senders 60b, 60c, and 60d may correspond to devices from which individual streams are received by IP gateway 100a. A fourth node (node #4) corresponding to the monitor 16 includes a receiver 70a. A "receiver" is a functional entity that has the ability to receive streams. The fifth node (node #5) corresponding to the IP gateway 100b includes receivers 70b and 70c, and the sixth node (node #6) corresponding to the IP gateway 100b includes a receiver 70d. Receivers 70b, 70c, and 70d may correspond to devices that receive individual streams accommodated by IP gateway 100b.

As understood from the above description, one node (which may also be referred to as a "card") represents one physical entity. Without being limited to the example of FIG. 1, one node may include any number of senders and/or any number of receivers as functional entities.

For example, NMOS, which is being considered by the AMWA, is based on such a logical system model and specifies a control interface for managing and controlling the transmission of streams in an IP domain. The management node 200 (IP controller 200 described later), APS 300, and other nodes may exchange messages for controlling the IP broadcast system 1, for example, according to this NMOS. For example, NMOS IS-04 provides a Hypertext Transfer Protocol (HTTP)-based control interface for discovery and registration of network resources. NMOS IS-05 provides an HTTP-based control interface for Device Connection Management. Note that the technology according to the present disclosure is not limited to such an example, and may be implemented using any standardized or non-standard control interface specification other than NMOS.

<1.2. Example of HTTP-based control message>
An example of an HTTP-based application protocol interface (API) control message for managing and controlling the transmission of a stream in an IP domain will now be described with reference to FIG.

FIG. 3 is an explanatory diagram showing an example of a registration message (IS-04 Registration) which is a control message for registering an existing node and is transmitted using HTTP. The registration message (IS-04 Registration) compliant with NMOS IS-04 may include, for example, information such as Node information, Sender information, Flow information, and Receiver information as registration information regarding the node, as shown in FIG. FIG. 2 is a diagram showing an example of a registration message in which Node information is described.

The registration message 51 shown in FIG. 3 includes a request line 52, a header 53, and a message body 54.

The request line 52 includes a URL (Uniform Resource Locator) that includes a host portion 56 and a path portion 57. Host portion 56 identifies the destination of registration message 51 . Accordingly, host portion 56 may be referred to as a "destination portion." In the example of FIG. 3, the destination of the registration message 51 is identified in the host portion 56 by the IP address "xxx.xxx.xxx.X". In other examples, message destinations may be identified by domain. The path portion 57 identifies the API standard and its version that the registration message 51 complies with. In the example of FIG. 3, it is understood from the path portion 57 of the registration message 51 that the registration message 51 is a type of control message compliant with version 1.2 of NMOS IS-04.

The message body 54 includes data describing the control content to be executed by the node to which the registration message 51 is addressed. As an example, the control content may be written in JSON (JavaScript (registered trademark) Object Notation) format. In the example of FIG. 3, the message body 54 of the registration message 51 describes a node ID that uniquely identifies the node to be registered, the IP address of the node "xxx.xxx.xxx.Y", and the like.

<1.3. Explanation of the assignment>

In an IP broadcasting system, a general-purpose network switch (for example, COTS) is used as an IP router, so that broadcasting equipment compatible with the NMOS standard can be connected to a general-purpose network. That is, it is expected that various devices will be connected to the IP broadcast system network.

However, it is not always guaranteed that the operating modes of various devices that transmit or receive streams will be consistent between the transmitter and the receiver. If streams from devices whose operating modes (4K mode, 3G mode, HD mode, etc.) do not match are sent from the sender to the receiver, network resources will be wasted and unexpected malfunctions will occur on the receiver. may also be triggered. In particular, in NMOS, the transmission specifications of the operation mode between transmitter and receiver are undefined.

The present disclosure aims to provide a mechanism for realizing appropriate and efficient stream switching control in an IP broadcast system network.

<2. First embodiment>
The first embodiment will be described in more detail using the drawings.

<2.1. System configuration>
FIG. 4 is a diagram showing an example of a schematic configuration of the IP broadcasting system 1 for realizing switching control according to the first embodiment. Referring to FIG. 4, the IP broadcast system 1 of this embodiment includes an IP gateway 100a, an IP gateway 100b, an IP router 12, an IP controller 200, and an APS 300. The IP gateway 100a, the IP gateway 100b, the IP router 12, the IP controller 200, and the APS 300 belong to the IP domain 10.

As video materials, for example, the camera 22 outputs an SDI signal that carries video data, the microphone 24 outputs an SDI signal that carries audio data, and the data server 26 outputs an SDI signal that carries video data, audio data, and auxiliary data. output an SDI signal carrying one or more of the following: Further, the converted SDI signal is transmitted by the IP gateway 100b to one or both of the integrated playout 32 and the monitor 34, which are video output destinations.

The IP gateway 100a and the IP gateway 100b are at least one gateway device located at the boundary between the IP domain 10 and other signaling domains, as shown in FIG. In this embodiment, the IP gateway 100a operates, for example, as a sender, and the IP gateway 100b operates, for example, as a receiver. Note that the IP gateway 100a may include a receiver, and the IP gateway 100b may include a sender. Further, the IP gateway 100a and the IP gateway 100b of this embodiment each have a plurality of operation modes (for example, 4K mode, HD mode, etc.).

The IP router 12 is one of the network devices 12 shown in FIG. 1, and may be a COTS, for example. Note that although one IP router 12 is shown in FIG. 4, there may be a plurality of IP routers 12.

The IP controller 200 is the management node 200 shown in FIG. 1, and is an information processing device that manages registration information regarding nodes belonging to the IP domain 10 and transmission of streams between nodes.

The APS 300 may be one of the IS-05 Clients, for example, and is a system that progresses the broadcast of television programs according to a predetermined schedule.

In this embodiment, for example, the IP controller 200 and the APS 300 compare the operation mode information transmitted or disclosed from the sender side with the operation mode information transmitted from the receiver side, and if they match, the IP controller 200 and the APS 300 Stream switching control is performed by transmitting a control message (IS-05 switching control) based on NMOS IS-05.

<2.2. IP gateway configuration>
FIG. 5 is a block diagram showing an example of the configuration of the IP gateway 100b according to the first embodiment. Referring to FIG. 5, the IP gateway 100b includes, for example, a processing section 110, a storage section 120, and a communication interface 130 as receiver functions.

(1) Processing Unit The processing unit 110 includes one or more processors such as a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or a microcontroller. The processing unit 110 implements the functionality of the IP gateway 100b by executing a computer program stored in the storage unit 120. In this embodiment, the processing unit 110 functions as, for example, a registration message generation unit 111 and a switching unit 112. In other words, it is a functional module realized by, for example, the registration message generation section 111 and the switching section 112.

(2) Storage Unit The storage unit 120 includes temporary and non-transitory computer-readable memory. Temporary memory may include, for example, RAM (Random Access Memory). The non-transitory memory may include, for example, one or more of ROM (Read Only Memory), HDD (Hard Disk Drive), or SSD (Solid State Drive). The storage unit 120 stores a computer program for realizing the functionality of the IP gateway 100b. The storage unit 120 further functions as a database used in the operation of the IP gateway 100b. A database may also be called a registry, a repository, or simply a table. In this embodiment, the data stored in the storage unit 120 is, for example, Node information, Receiver information, etc. described in a registration message (IS-04 Registration). Note that if the IP gateway 100b includes a sender, it also stores Sender information and Flow information.

FIG. 6 is a diagram showing an example of Receiver information written in the message body 54 of the registration message 51. In the Receiver information of this embodiment, for example, information on the operation mode of the receiver, which is undefined in NMOS, is described. Specifically, information on the operation mode of the receiver is written in, for example, "tags" that can be written freely. In this embodiment, by writing information about the operation mode of the receiver, the receiver can handle video data (HD mode, 3G mode, 4K mode, etc.), audio data (Audio mode), and auxiliary data (Data mode). Determine in which mode it is operating. For example, when the receiver operates in HD mode, 3G mode, 4K mode, etc., information regarding bands (resolution, frame rate, interlace mode), etc. corresponding to each operating mode is described. Further, for example, when the receiver operates in Audio mode, the codec name (L24), sample rate (48000 or 96000), etc. are written. Further, for example, when the receiver operates in Data mode, a format name (smpte291), etc. is written. Further, the information on the operation mode may be referred to as operation mode information or media format information.

Note that the registration message 51 may include Sender information and Flow information in addition to the Node information shown in FIG. 3 and the Receiver information shown in FIG. 6. 7 and 8 show examples of descriptions of Sender information and Flow information, respectively, and in this example, the operation mode of the sender is specified (within the NMOS specifications). Note that in FIGS. 7 and 8, the details of the sender operation mode information are described in the Flow information, and the Sender information and the Flow information are linked by "ID".

(3) Communication Interface The communication interface 130 is an interface that mediates communication with other devices. The communication interface 130 may include a connection terminal and a connection circuit for wired communication, or may include an antenna, an RF (Radio Frequency) circuit, and a baseband circuit for wireless communication.

(4) Registration message generation unit When the device itself connects to an IP network, the registration message generation unit 111 reads Receiver information including receiver operation mode information from the storage unit 120, and generates a registration message in which the Receiver information is described. 51 (IS-04 Registration) (see FIG. 6). Then, the registration message generation unit 111 transmits the generated registration message 51 (IS-04 Registration) to the IP controller 200 via the communication interface 130.

(5) Switching Unit The switching unit 112 has a function of switching streams when notified of a control message (IS-05 switching control) from the IP controller 200 or APS 300 via the communication interface 130.

In this embodiment, the IP gateway 100a that operates as a sender registers the Sender information including the operation mode information of the Sender by processing within the scope of NMOS specifications when connecting to the IP network. Message 51 (IS-04 Registration) is generated. Then, the IP gateway 100a transmits the generated registration message 51 (IS-04 Registration) to the IP controller 200 (corresponding to the Sender information (IS-04) in FIG. 4).

Furthermore, the IP gateway 100a may disclose the Sender information to the IP controller 200 (a node connected to the IP network) using a method other than the above. For example, when the IP controller 200 discovers the IP gateway 100a (sender) connected to the IP network through a predetermined node discovery procedure of NMOS, the sender transmits Sender information to the IP controller 200 in response to an inquiry (Fig. Sender information (SDP)). As an example, the Sender information is written in SDP (Session Description Protocol) format. FIG. 9 is a diagram showing an example of Sender information written in SDP format. Similarly to the Sender information and Flow information shown in FIGS. 7 and 8, the Sender information written in the SDP format also includes information on the operation mode of the sender (for example, information on the band (resolution, frame rate, interlace mode)). It has been described.

Then, the IP controller 200 that has acquired the Sender information using either or both of the above two registration methods registers the Sender information in the storage unit 220, which will be described later.

The IP gateway 100a, which operates as a sender in this embodiment, operates within the scope of the NMOS specifications, so a detailed explanation will be omitted hereafter.

<2.3. IP controller configuration>
FIG. 10 is a block diagram showing an example of the configuration of the IP controller 200 according to the first embodiment. Referring to FIG. 10, the IP controller 200 includes a processing section 210, a storage section 220, and a communication interface 230.

(1) Processing Unit The processing unit 210 includes one or more processors such as a CPU, an MPU, or a microcontroller. The processing unit 210 realizes the functionality of the IP controller 200 by executing a computer program stored in the storage unit 220. In this embodiment, the processing unit 210 functions as, for example, a registration unit 211, a comparison unit 212, a control message generation unit 213, and a notification message generation unit 214. In other words, it is a functional module realized by, for example, the registration section 211, the comparison section 212, the control message generation section 213, and the notification message generation section 214.

(2) Storage Unit The storage unit 220 includes temporary and non-transitory computer-readable memory. Temporary memory may include, for example, RAM. Non-transitory memory may include, for example, one or more of ROM, HDD, or SSD. The storage unit 220 stores a computer program for implementing the functionality of the IP controller 200. Storage unit 220 further functions as a database used in the operation of IP controller 200. In this embodiment, the data stored in the storage unit 220 includes, for example, Node information and Sender information described in the registration message 51 (IS-04 Registration) sent from the IP gateways 100a and 100b connected to the IP network. , Receiver information, etc. That is, registration information regarding all IP gateway nodes 100a and 100b involved in stream transmission is stored. Further, the Sender information stored in the storage unit 220 includes sender operation mode information, and the Receiver information includes receiver operation mode information.

(3) Communication Interface The communication interface 230 is an interface that mediates communication with other devices. The communication interface 230 may include a connection terminal and a connection circuit for wired communication, or may include an antenna, an RF (Radio Frequency) circuit, and a baseband circuit for wireless communication.

(4) Registration unit The registration unit 211 stores registration information (Node information) regarding nodes that transmit or receive streams in the IP broadcasting system 1 (corresponding to the IP gateway 100a (sender) and IP gateway 100b (receiver) of this embodiment). , Sender information, Receiver information, etc.) are managed in the storage unit 220. For example, the registration unit 211 monitors the connection of a node to the IP network, and when the connection of a node is detected, acquires registration information regarding the node from the connected node. Detection of node connectivity is performed through standardized node discovery procedures (eg, NMOS IS-04). Further, acquisition of registration information regarding the node from the sender is performed through a standardized node registration procedure (eg, NMOS IS-04). Also, acquisition of registration information about the node from the receiver is performed through an enhanced node registration procedure (eg, enhanced NMOS IS-04). That is, in the Receiver information included in the registration information regarding the node from the receiver, operation mode information of the receiver that is undefined in NMOS is described. In this embodiment, for example, the IP gateway 100a (sender) and the IP gateway 100b (receiver) whose connection to the IP network has been detected sends the registration message 51 (IS-04 Registration) containing the various information described above to the IP controller. Send to 200. Thereby, the registration unit 211 extracts and acquires registration information regarding the node from the received registration message 51.

FIG. 11 is a sequence diagram showing a registration sequence of registration information regarding a node. In FIG. 11, registration information regarding a node is described in a registration message 51 (IS-04 Registration), and it is described how the registration message 51 is sent from the IP gateways 100a and 100b to the IP controller 200 (step S1). . Further, as will be described later, in FIG. 11, registration information regarding a node is described in a notification message (IS-04 registration information notification) that is a control message from the IP controller 200 to the APS 300, and the notification message is sent from the IP controller 200 to the APS 300. It describes how the information is sent to (step S2).

(5) Comparison unit In a situation where stream transmission between a sender and a receiver is set up, the comparison unit 212 is configured to perform a broadcast operation using, for example, the setting terminal 18 shown in FIG. 1, a touch panel, a remote control (not shown), etc. When a device instructs the IP controller 200 to switch streams, operation mode information of the sender (IP gateway 100a) that is the transmission source of the stream to be set up, and operation mode information of the receiver (IP gateway 100b) to be switched. Compare with. Then, if the comparison results match, the comparison unit 212 instructs the control message generation unit 213 to generate a control message (IS-05 switching control). On the other hand, if the comparison results do not match, nothing is done. That is, this allows the current stream transmission to be maintained.

(6) Control message generation unit The control message generation unit 213 receives a generation instruction from the comparison unit 212 and generates a control message (IS-05 switching control) to be transmitted to the receiver (IP gateway 100b) to be switched. do. Then, the control message generation unit 213 transmits the generated control message (IS-05 switching control) to the target IP gateway 100b via the communication interface 230.

(7) Notification Message Generation Unit The notification message generation unit 214 writes registration information about the node every time registration information about the node (Node information, Sender information, Receiver information, etc.) is registered from a node connected to the IP network. A notification message (IS-04 registration information notification) is generated. Then, the notification message generation unit 214 transmits the generated notification message (IS-04 registration information notification) to the APS 300 via the communication interface 230.

FIG. 12 is a diagram showing an example of a notification message (IS-04 registration information notification) in which Receiver information is described. The Receiver information shown in FIG. 12 describes, for example, information on the operation mode of the receiver. Specifically, information on the operation mode of the receiver is written, for example, in the "post" parameter. As a result, the APS 300 that has received the notification message extracts the operation mode information of the receiver from the notification message, so that the receiver can receive video data (HD mode, 3G mode, 4K mode, etc.), audio data (Audio mode, etc.). , it is possible to specify which mode is operating in which mode corresponds to auxiliary data (Data mode). For example, when the receiver operates in HD mode, 3G mode, 4K mode, etc., information regarding bands (resolution, frame rate, interlace mode), etc. corresponding to each operating mode is described (see FIG. 12).

<2.4. APS configuration>
FIG. 13 is a block diagram showing an example of the configuration of the APS 300 according to the first embodiment. Referring to FIG. 13, the APS 300 includes a processing section 310, a storage section 320, and a communication interface 330.

(1) Processing Unit The processing unit 310 includes one or more processors such as a CPU, an MPU, or a microcontroller. The processing unit 310 implements the functionality of the APS 300 by executing a computer program stored in the storage unit 320. In this embodiment, the processing unit 310 functions as a registration unit 311, a comparison unit 312, and a control message generation unit 313, for example. In other words, it is a functional module realized by, for example, the registration section 311, the comparison section 312, and the control message generation section 313.

(2) Storage Unit The storage unit 320 includes temporary and non-transitory computer-readable memory. Temporary memory may include, for example, RAM. Non-transitory memory may include, for example, one or more of ROM, HDD, or SSD. Storage unit 320 stores computer programs for realizing the functionality of APS 300. Storage unit 320 further functions as a database used in the operation of APS 300. In this embodiment, the data stored in the storage unit 320 is, for example, Node information, Sender information, Receiver information, etc. described in a notification message (IS-04 registration information notification) sent from the IP controller 200. . That is, registration information regarding all IP gateway nodes 100a and 100b that transmit and receive streams may be included.

(3) Communication Interface The communication interface 330 is an interface that mediates communication with other devices. The communication interface 330 may include a connection terminal and a connection circuit for wired communication, or may include an antenna, an RF (Radio Frequency) circuit, and a baseband circuit for wireless communication.

(4) Registration unit The registration unit 311 stores registration information (Node information, Sender information, Receiver information) regarding nodes (corresponding to the IP gateway 100a and IP gateway 100b of this embodiment) that transmit or receive streams in the IP broadcasting system 1. etc.) are managed in the storage unit 320. The registration unit 311 receives a notification message (IS-04 registration information notification) describing registration information regarding a node from the IP controller 200 every time a connection of a node is detected by the IP controller 200. Then, the registration unit 311 extracts and obtains registration information regarding the node from the notification message.

FIG. 11 shows how registration information regarding a node is written in a notification message (IS-04 registration information notification) and how the notification message is sent from the IP controller 200 to the APS 300 (step S2).

(5) Comparison unit In a situation where stream transmission between a sender and a receiver has been set up, for example, when a user operation instructs the APS 300 to switch streams, the comparison unit 312 selects the sender of the stream to be set up. The operation mode information of (IP gateway 100a) and the operation mode information of the receiver (IP gateway 100b) to be switched are compared. Then, if the comparison results match, the comparing unit 312 instructs the control message generating unit 313 to generate a control message (IS-05 switching control). On the other hand, if the comparison results do not match, nothing is done. That is, this allows the current stream transmission to be maintained.

(6) Control message generation unit The control message generation unit 313 receives a generation instruction from the comparison unit 312 and generates a control message (IS-05 switching control) to be transmitted to the receiver to be switched (IP gateway 100b). do. Then, the control message generation unit 313 transmits the generated control message (IS-05 switching control) to the target IP gateway 100b via the communication interface 330.

<2.5. Technical features>
The flow of processing of the IP broadcasting system 1 related to switching control of this embodiment will be described below with reference to FIGS. 4, 5, 10, and 13.

In FIG. 4, for example, the IP controller 200 and APS 300 compare the operation mode information transmitted or disclosed from the sender side with the operation mode information transmitted from the receiver side, and if they match, the IP controller 200 and the APS 300 transmit the stream to the receiver. Assume a case where switching control is performed. In addition, in this embodiment, in the process of registering registration information regarding a node, the IP gateway 100a including the sender sends a registration message in which Sender information including operation mode information of the sender is described, in a process within the scope of NMOS specifications. 51 (IS-04 Registration) is transmitted to the IP controller 200. In addition, regarding the registration process of registration information regarding a node, as shown in FIG. 9, Sender information described in SDP format may be made public.

(registration process)
In FIG. 4, the IP controller 200 constantly monitors the connection of nodes to the IP network, and when the connection of a node to the IP network is detected, acquires registration information regarding the node from the connected node. At this time, for example, when the IP gateway 100b including the receiver shown in FIG. information, Receiver information, etc.) and generates a registration message 51 (IS-04 Registration) for registering registration information regarding the node. Specifically, the registration message generation unit 111 generates the registration message describing Node information (for example, see FIG. 3) and the registration message 51 describing Receiver information (for example, see FIG. 6). . Note that if the configuration includes a sender, a registration message 51 describing Sender information etc. may be generated.

Then, the registration message generation unit 111 transmits the generated registration message 51 (IS-04 Registration) to the IP controller 200 via the communication interface 130 (see step S1 in FIG. 11).

The IP controller 200 registers registration information regarding each node every time it receives a registration message 51 (IS-04 Registration) from a node connected to the IP network. Specifically, in the IP controller 200 , the registration unit 211 extracts registration information regarding the node from the registration message 51 received via the communication interface 230 and registers it in the storage unit 220 .

In addition, in the IP controller 200, each time registration information regarding the node is registered from a node connected to the IP network, the notification message generation unit 214 generates a notification message (IS-04 registration information) that describes the registration information regarding the node. notifications). Then, the notification message generation unit 214 transmits the generated notification message (IS-04 registration information notification) to the APS 300 via the communication interface 230.

Each time the APS 300 receives a notification message (IS-04 registration information notification) from the IP controller 200, it registers registration information regarding each node. Specifically, in the APS 300 , the registration unit 311 extracts registration information regarding the node from the notification message received via the communication interface 330 and registers it in the storage unit 320 .

(switching control)
Next, stream switching control will be explained. Here, upon receiving a request to transmit a stream from a sender (corresponding to the IP gateway 100a in FIG. 4) to a receiver (corresponding to the IP gateway 100b in FIG. 4), the IP controller 200 transmits the requested stream. It is assumed that it has already been set up.

(Switching control by IP controller)
For example, in a situation where at least one stream has been set up, the IP controller 200 receives an instruction to switch one of the streams from the setting terminal 18 shown in FIG. 1 or broadcast equipment such as a touch panel and remote control (not shown). If so, switching control is performed based on the registration information regarding the registered node. Specifically, the comparison unit 212 of the IP controller 200 obtains the operation mode information of the sender (the source IP gateway 100a) that is the transmission source of the stream to be set up, and the receiver to be switched (of the stream) from the storage unit 220. The operation mode information of the IP gateway 100b) which is the receiving destination is read out and compared.

Then, if the comparison results show that both pieces of operation mode information match, the comparison unit 212 instructs the control message generation unit 213 to generate a control message (IS-05 switching control). At this time, if the comparison results do not match, the comparison unit 212 does not instruct the generation of a control message (IS-05 switching control), and for example, the comparison unit 212 sends the sender and receiver to the device that issued the above switching instruction. Notifies that the stream cannot be switched because the operation mode information of the stream does not match. This maintains the current stream transmission.

The control message generation unit 213, which has been instructed to generate the control message (IS-05 switching control), generates the control message to be transmitted to the receiver to be switched (the destination IP gateway 100b). Then, the control message generation unit 213 transmits the generated control message (IS-05 switching control) to the target IP gateway 100b via the communication interface 230.

In the IP gateway 100b that receives the control message (IS-05 switching control) via the communication interface 130, the switching unit 112 switches streams based on the content described in the control message.

(Switching control by APS)
Furthermore, when a user operation instructs the APS 300 to switch the streams, the APS 300 performs switching control based on registration information regarding registered nodes. Specifically, the comparison unit 312 of the APS 300 obtains, from the storage unit 320, the operation mode information of the sender (the source IP gateway 100a) that is the transmission source of the stream to be set up, and the operation mode information of the receiver to be switched (the reception destination of the stream). The operation mode information of the IP gateway 100b) is read out and compared.

Then, if the comparison results show that both pieces of operation mode information match, the comparison unit 312 instructs the control message generation unit 313 to generate a control message (IS-05 switching control). At this time, if the comparison results do not match, the comparison unit 312 does not instruct the generation of a control message (IS-05 switching control), and the comparison unit 312, for example, sends the user device that has issued the switching instruction to the sender and Notifies that stream switching is not possible because the receiver operation mode information does not match. This maintains the current stream transmission.

The control message generation unit 313, which has been instructed to generate the control message (IS-05 switching control), generates the control message to be transmitted to the receiver to be switched (the destination IP gateway 100b). Then, the control message generation unit 313 transmits the generated control message (IS-05 switching control) to the target IP gateway 100b via the communication interface 330.

In the IP gateway 100b that receives the control message (IS-05 switching control) via the communication interface 130, the switching unit 112 switches streams based on the content described in the control message.

As described above, the IP broadcasting system 1 of this embodiment includes at least one IP gateway 100b that operates as a receiver on an IP network and is capable of exchanging IP-based messages according to NMOS.

The IP gateway 100b also includes a storage unit 120 for storing Receiver information including information on the operation mode of its own device, reads out the Receiver information from the storage unit 120, and sends a registration message 51 in which the Receiver information is described. (IS-04 Registration).

As a result, in the IP broadcasting system 1, the IP controller 200 and the APS 300 can register the operation mode information of the receiver, and also check in advance whether the operation modes match between the sender and the receiver. Therefore, appropriate and efficient stream switching control can be realized.

<3. Modification of the first embodiment>
In the first embodiment, the IP controller 200 and the APS 300 perform appropriate and efficient stream switching control by checking in advance whether the operation modes of the sender and receiver match each other. .

In a first modification, it is conceivable that the IP gateway 100b including the receiver has a configuration that checks whether the operation modes of the sender and receiver match each other.

For example, the IP gateway 100b uses Sender information published in the SDP format shown in FIG. Compare the information and determine whether there is a match.

This allows, for example, even if a control message (IS-05 switching control) is received from a node that does not have a configuration to check in advance whether the operating modes match each other between the sender and the receiver. Since the operation mode information can be checked within the device itself, appropriate and efficient stream switching control can be realized.

<4. Second embodiment>
Next, a second embodiment will be described with reference to FIG. 14. The first embodiment described above is a specific embodiment, but the second embodiment is a more generalized embodiment.

<4.1. System configuration>
FIG. 14 is a diagram showing an example of a schematic configuration of an IP gateway 500 of an IP broadcast system according to the second embodiment. Referring to FIG. 14, the IP broadcasting system of this embodiment includes at least one IP gateway 500 that operates as a receiver on an IP network and is capable of exchanging IP-based messages according to NMOS. The IP gateway 500 includes a storage section 520 and a registration message generation section 510.

<4.2. Technical features＞
Next, technical features of the second embodiment will be explained.

In the second embodiment, receiver information including information on the operating mode of the device itself is stored in the storage unit 520. The registration message generation unit 510 reads the receiver information from the storage unit 520, and generates and transmits a registration message in which the receiver information is described.

According to the second embodiment, appropriate and efficient stream switching control can be realized in a network of an IP broadcasting system.

Part or all of the above embodiments may be described as in the following additional notes, but are not limited to the following.

(Additional note 1)
at least one IP gateway device capable of operating as a receiver on an IP network and performing IP-based message exchange according to NMOS;
Equipped with
The IP gateway device includes:
a first storage unit for storing receiver information including information on the operating mode of the own device;
a registration message generation unit that reads the receiver information from the first storage unit and generates and transmits a registration message in which the receiver information is described;
Equipped with
IP broadcasting system.

(Additional note 2)
The information on the operation mode includes information regarding a band.
The IP broadcasting system described in Appendix 1.

(Additional note 3)
at least one sender that transmits or publishes sender information including information on the operating mode of its own device according to NMOS;
a management node device that manages transmission of at least one stream set up between the sender and the receiver;
Furthermore,
The management node device includes:
a second storage unit for storing the sender information as registration information;
a first registration unit that extracts the receiver information from the registration message and stores the receiver information as the registration information in the second storage unit each time the registration message is received from a receiver connected to an IP network; and,
Equipped with
The IP broadcasting system according to appendix 1 or 2.

(Additional note 4)
The management node device includes:
A first step of comparing information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; Comparison section and
a first control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the first comparison unit;
further comprising,
The IP broadcasting system described in Appendix 3.

(Appendix 5)
If the information on the two operating modes does not match as a result of the comparison by the first comparing unit, the first comparing unit informs the device that issued the switching instruction that the stream cannot be switched. Notice,
The IP broadcasting system described in Appendix 4.

(Appendix 6)
The management node device includes:
a notification message generating unit that generates a notification message describing the registration information each time the registration information is stored in the second storage unit, and transmits the notification message to the NMOS client device;
Further prepare,
The IP broadcasting system according to appendix 3, 4, or 5.

(Appendix 7)
The client device includes:
a third storage unit for storing the registration information;
a second registration unit that extracts the registration information from the notification message and stores the registration information in the third storage unit each time the notification message is received;
A second method that compares information on the operation mode of the sender that is the source of the stream and information on the operation mode of the receiver that is the destination of the stream based on the registration information when a stream switching instruction is received. Comparison section and
a second control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the second comparison unit;
Equipped with
The IP broadcasting system described in Appendix 6.

(Appendix 8)
If the information on the two operating modes does not match as a result of the comparison by the second comparing unit, the second comparing unit informs the device that issued the switching instruction that the stream cannot be switched. Notice,
The IP broadcasting system described in Appendix 7.

(Appendix 9)
In an IP gateway device that operates as a receiver on an IP network and is capable of exchanging IP-based messages according to NMOS,
a storage unit for storing receiver information including information on the operating mode of the own device;
a registration message generation unit that reads the receiver information from the storage unit and generates and transmits a registration message in which the receiver information is described;
Equipped with
IP gateway device.

(Appendix 10)
The information on the operation mode includes information regarding a band.
The IP gateway device according to appendix 9.

(Appendix 11)
At least one sender that transmits or publishes sender information including information on the operation mode of the own device according to NMOS, and at least one receiver that sends a registration message in which receiver information including information on the operation mode of the own device is described; In the management node device configuring the IP broadcasting system,
a storage unit for storing the sender information as registration information;
a registration unit that extracts the receiver information from the registration message and stores the receiver information as the registration information in the storage unit each time the registration message is received from a receiver connected to an IP network;
Equipped with
Management node device.

(Appendix 12)
a comparison unit that compares information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; ,
a control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the comparison unit;
further comprising,
The management node device according to appendix 11.

(Appendix 13)
If the information on the two operating modes does not match as a result of the comparison by the comparison unit, the comparison unit notifies the device that issued the switching instruction that stream switching is not possible.
The management node device according to appendix 12.

(Appendix 14)
a notification message generating unit that generates a notification message describing the registration information each time the registration information is stored in the storage unit, and transmits the notification message to an NMOS client device;
Further prepare,
The management node device according to appendix 11, 12 or 13.

(Appendix 15)
at least one sender that transmits or publishes sender information including information on the operation mode of its own device according to NMOS; at least one receiver that sends a registration message in which receiver information including information on the operation mode of its own device is described; An IP broadcasting system is configured with a management node device that registers sender information and receiver information described in the registration message as registration information, and transmits a notification message describing the registration information each time the registration information is registered. In the NMOS client device,
a storage unit for storing the registration information;
a registration unit that extracts the registration information from the notification message and stores the registration information in the storage unit each time the notification message is received;
a comparison unit that compares information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; ,
a control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the comparison unit;
Equipped with
Client device.

(Appendix 16)
If the information on the two operating modes does not match as a result of the comparison by the comparison unit, the comparison unit notifies the device that issued the switching instruction that stream switching is not possible.
The client device according to appendix 15.

(Appendix 17)
A method for registering information by an IP gateway device operating as a receiver on an IP network and capable of exchanging IP-based messages according to NMOS, comprising:
a generation step of generating a registration message in which receiver information including information on the operation mode of the own device is described;
a sending step of sending the registration message;
method including.

(Appendix 18)
The information on the operation mode includes information regarding a band.
The method described in Appendix 17.

(Appendix 19)
a first sending step in which at least one sender sends or publishes sender information including information on the operation mode of the own device according to NMOS;
a second sending step in which at least one receiver sends a registration message in which receiver information including information on the operating mode of the own device is described;
a first registration step in which a management node device that manages transmission of at least one stream set up between the sender and the receiver registers the sender information as registration information;
a second registration step in which the management node device extracts the receiver information from the registration message and registers the receiver information as the registration information each time the management node device receives the registration message from a receiver connected to an IP network; ,
method including.

(Additional note 20)
The management node device that has received the stream switching instruction compares information on the operation mode of the sender that is the source of the stream and information on the operation mode of the receiver that is the destination of the stream, based on the registration information. a first comparison step;
a first control message generation step in which the management node device generates a control message for switching streams when the information on both operation modes matches as a result of the comparison in the first comparison step;
a first control message sending step in which the management node device sends the control message;
further including,
The method described in Appendix 19.

(Additional note 21)
If the information on the two operating modes does not match as a result of the comparison in the first comparison step, the management node device notifies the device that issued the switching instruction that stream switching is not possible. ,
The method described in Appendix 20.

(Additional note 22)
a notification message generation step in which the management node device generates a notification message describing the registration information each time the registration information is registered;
a notification message sending step in which the management node device sends the notification message to an NMOS client device;
In addition, including
The method according to appendix 19, 20 or 21.

(Additional note 23)
a third registration step in which the client device that has received the notification message extracts the registration information from the notification message and registers the registration information;
The client device, which has received a stream switching instruction, compares information on an operation mode of a sender that is a source of the stream and information on an operation mode of a receiver that is a receiver of the stream, based on the registration information. 2 comparison step,
a second control message generation step in which the client device generates a control message for switching streams if the information on both operation modes matches as a result of the comparison in the second comparison step;
a second control message sending step in which the client device sends the control message;
including,
The method described in Appendix 22.

(Additional note 24)
If the information on the two operating modes does not match as a result of the comparison in the second comparison step, the client device notifies the device that issued the switching instruction that stream switching is not possible.
The method described in Appendix 23.

1 IP broadcast system 10 IP domain 12 Network device (IP router)
14, 22 Cameras 16, 34 Monitor 18 Setting terminal 24 Microphone 26 Data server 32 Integrated playout 51 Registration message 52 Request line 53 Header 54 Message body 56 Host part 57 Path part 60, 60a, 60b, 60c, 60d Sender 70, 70a , 70b, 70c, 70d Receiver 100a, 100b, 500 IP gateway 110, 210, 310 Processing section 111, 510 Registration message generation section 112 Switching section 120, 220, 320, 520 Storage section 130, 230, 330 Communication interface 200 Management node (IP controller)
211, 311 Registration unit 212, 312 Comparison unit 213, 313 Control message generation unit 214 Notification message generation unit 300 APS

Claims (10)

at least one IP gateway device capable of operating as a receiver on an IP network and performing IP-based message exchange according to NMOS;
Equipped with
The IP gateway device includes:
a first storage unit for storing receiver information including information on the operating mode of the own device;
a registration message generation unit that reads the receiver information from the first storage unit and generates and transmits a registration message in which the receiver information is described;
Equipped with
IP broadcasting system. at least one sender that transmits or publishes sender information including information on the operating mode of its own device according to NMOS;
a management node device that manages transmission of at least one stream set up between the sender and the receiver;
Furthermore,
The management node device includes:
a second storage unit for storing the sender information as registration information;
a first registration unit that extracts the receiver information from the registration message and stores the receiver information as the registration information in the second storage unit each time the registration message is received from a receiver connected to an IP network; and,
Equipped with
The IP broadcast system according to claim 1. The management node device includes:
A first step of comparing information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; Comparison section and
a first control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the first comparison unit;
further comprising,
The IP broadcast system according to claim 2. The management node device includes:
a notification message generating unit that generates a notification message describing the registration information each time the registration information is stored in the second storage unit, and transmits the notification message to the NMOS client device;
Further prepare,
The IP broadcast system according to claim 2 or 3. The client device includes:
a third storage unit for storing the registration information;
a second registration unit that extracts the registration information from the notification message and stores the registration information in the third storage unit each time the notification message is received;
A second method that compares information on the operation mode of the sender that is the source of the stream and information on the operation mode of the receiver that is the destination of the stream based on the registration information when a stream switching instruction is received. Comparison section and
a second control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the second comparison unit;
Equipped with
The IP broadcast system according to claim 4. In an IP gateway device that operates as a receiver on an IP network and is capable of exchanging IP-based messages according to NMOS,
a storage unit for storing receiver information including information on the operating mode of the own device;
a registration message generation unit that reads the receiver information from the storage unit and generates and transmits a registration message in which the receiver information is described;
Equipped with
IP gateway device. At least one sender that transmits or publishes sender information including information on the operation mode of the own device according to NMOS, and at least one receiver that sends a registration message in which receiver information including information on the operation mode of the own device is described; In the management node device configuring the IP broadcasting system,
a storage unit for storing the sender information as registration information;
a registration unit that extracts the receiver information from the registration message and stores the receiver information as the registration information in the storage unit each time the registration message is received from a receiver connected to an IP network;
Equipped with
Management node device. a comparison unit that compares information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; ,
a control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the comparison unit;
further comprising,
The management node device according to claim 7. at least one sender that transmits or publishes sender information including information on the operation mode of its own device according to NMOS; at least one receiver that sends a registration message in which receiver information including information on the operation mode of its own device is described; An IP broadcasting system is configured with a management node device that registers sender information and receiver information described in the registration message as registration information, and transmits a notification message describing the registration information each time the registration information is registered. In the NMOS client device,
a storage unit for storing the registration information;
a registration unit that extracts the registration information from the notification message and stores the registration information in the storage unit each time the notification message is received;
a comparison unit that compares information on an operation mode of a sender that is a source of a stream and information on an operation mode of a receiver that is a receiver of a stream based on the registration information when a stream switching instruction is received; ,
a control message generation unit that generates and transmits a control message for switching streams when information on both operation modes match as a result of comparison by the comparison unit;
Equipped with
Client device. a first sending step in which at least one sender sends or publishes sender information including information on the operation mode of the own device according to NMOS;
a second sending step in which at least one receiver sends a registration message in which receiver information including information on the operating mode of the own device is described;
a first registration step in which a management node device that manages transmission of at least one stream set up between the sender and the receiver registers the sender information as registration information;
a second registration step in which the management node device extracts the receiver information from the registration message and registers the receiver information as the registration information each time the management node device receives the registration message from a receiver connected to an IP network; ,
method including.

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