JP2017092581A - Gateway unit, broadcast receiver, broadcast relay method, broadcast reception method, broadcast relay program, and broadcast reception program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication service capable of stably receiving a stream.SOLUTION: A gateway unit comprises: a receiving part that receives and outputs a packed; a transmission part that transmits the packet received from the receiving part; and a storage part. The receiving part that can recognize whether or not the received packet is a stream obtained by divided content information into a plurality of packets, the stream requested by the broadcast receiver, and is the packet of stream multi-casted or broadcasted as a target packet. In the case where the received packet is the target packet, the packet is stored to the storage part, and the transmission part transmits the target packet stored to the storage part to the broadcast receiver in response to a retransmission request from the broadcast receiver.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gateway device, a broadcast receiving device, a broadcast relay method, a broadcast reception method, a broadcast relay program, and a broadcast reception program, and in particular, a gateway device that receives a stream in which content information is divided into a plurality of packets, and broadcast reception. The present invention relates to an apparatus, a broadcast relay method, a broadcast reception method, a broadcast relay program, and a broadcast reception program.

  In an IPTV service, which is a video service using an IP network, specifications necessary for providing an IP broadcast service to a fixed receiver are defined (IPTV Forum, “IP Broadcast Specification (IPTVFJ STD-0004 1. 0 version) ”, formulated on September 1, 2008 (see Non-Patent Document 1)).

  The IP broadcast service is a broadcast-type service provided by multicast streaming. The service provider transmits a service stream transmitted from the content provider by multicast, and the service provider creates and transmits the service stream by itself. There is.

IPTV Forum, “IP Broadcast Specification (IPTVFJ STD-0004 1.0 Edition)”, formulated on September 1, 2008

  For example, in a home or office where the above IPTV service is provided, when the communication environment for transmitting a stream deteriorates, the data of the stream may be interrupted and the viewing content of the broadcast program may be lost. .

  This invention was made in order to solve the above-mentioned subject, The objective is a gateway device which can provide a communication service which can receive a stream more stably, a broadcast receiving device, a broadcast relay method, A broadcast reception method, a broadcast relay program, and a broadcast reception program are provided.

  (1) In order to solve the above-described problem, a gateway device according to an aspect of the present invention includes a reception unit that receives and outputs a packet, a transmission unit that transmits the packet received from the reception unit, and a storage unit The receiving unit is a stream in which content information is divided into a plurality of packets, a stream requested from a broadcast receiving device, and the packet of a stream to be multicast or broadcast Whether the received packet is the target packet, the packet is stored in the storage unit, and the transmission unit further resends from the broadcast receiving device Upon receiving the request, the target packet stored in the storage unit is transmitted to the broadcast receiving apparatus.

  (5) In order to solve the above-described problem, a broadcast receiving apparatus according to an aspect of the present invention is a stream in which content information is divided into a plurality of packets, and relays the packets of a multicast or broadcast stream. A receiving unit that receives a target packet, which is the packet requested by the broadcast receiving device, from a possible gateway device; and the target that is transmitted from the gateway device to the broadcast receiving device and stored in the gateway device A transmission unit that transmits a packet recovery transmission inquiry to the gateway device, wherein the reception unit receives a response to the recovery transmission inquiry from the gateway device, and receives the target packet according to the content of the response Change the behavior.

  (7) In order to solve the above-described problem, a broadcast relay method according to an aspect of the present invention is a broadcast relay method in a gateway device including a storage unit, and includes a step of transmitting a received packet, Identifying whether the content information is a stream divided into a plurality of packets, is a stream requested from a broadcast receiving apparatus, and is a target packet that is the packet of the multicast or broadcast stream; Storing the packet in the storage unit when the received packet is the target packet; receiving the retransmission request from the broadcast receiving device; and receiving the target packet stored in the storage unit in the broadcast receiving device To send to.

  (8) In order to solve the above-described problem, a broadcast receiving method according to an aspect of the present invention is a broadcast receiving method in a broadcast receiving device, wherein the content information is a stream divided into a plurality of packets, A step of receiving a target packet that is the packet requested by the broadcast receiving device of itself from a gateway device capable of relaying the packet of the multicast or broadcast stream, and transmitted from the gateway device to the broadcast receiving device; And transmitting a recovery transmission inquiry of the target packet stored in the gateway device to the gateway device, receiving a response to the recovery transmission inquiry from the gateway device, and depending on the content of the response, the target packet Receive operation Further to comprising the steps.

  (9) In order to solve the above-described problem, a broadcast relay program according to an aspect of the present invention is a broadcast relay program used in a gateway device, and includes a receiving unit that receives and outputs a packet from a computer, A program for functioning as a transmission unit that transmits the packet received from the reception unit and a storage unit, wherein the reception unit is a stream in which content information is divided into a plurality of packets. Yes, it is a stream requested from a broadcast receiving apparatus, and it is possible to identify whether it is a target packet that is the packet of the multicast or broadcast stream, and when the received packet is the target packet, The packet is stored in the storage unit, and the transmission unit further receives the broadcast. Upon receiving a retransmission request from the device, it transmits the target packet stored in the storage unit to the broadcast receiving apparatus.

  (10) In order to solve the above-described problem, a broadcast receiving program according to an aspect of the present invention is a broadcast receiving program used in a broadcast receiving apparatus, and the content information is divided into a plurality of packets. A receiving unit that receives a target packet, which is the packet requested by the broadcast receiving device of its own, from a gateway device that can relay the packet of the stream that is a stream or is multicast or broadcast; And a transmission unit that transmits a recovery transmission inquiry of the target packet transmitted to the reception device and stored in the gateway device to the gateway device, the reception unit configured to perform the recovery transmission inquiry Against Receiving an answer from said gateway device, changing the receiving operation of the target packet according to the content of the response.

  The present invention can be realized not only as a gateway device including such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes part or all of the gateway device, or as a system including the gateway device. be able to.

  Further, the present invention can be realized not only as a broadcast receiving apparatus including such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes part or all of the broadcast receiving apparatus, or a system including the broadcast receiving apparatus. Can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, the communication service which can receive a stream more stably can be provided.

FIG. 1 is a diagram showing a configuration of a broadcasting system according to an embodiment of the present invention. FIG. 2 is a diagram showing in detail a part of the configuration of the broadcast system according to the embodiment of the present invention. FIG. 3 is a diagram showing a configuration of the gateway device in the broadcasting system according to the embodiment of the present invention. FIG. 4 is a diagram showing a configuration of a broadcast receiving apparatus in the broadcast system according to the embodiment of the present invention. FIG. 5 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention. FIG. 6 is a diagram showing an example of a recovery packet processing sequence of the target packet in the broadcast system according to the embodiment of the present invention. FIG. 7 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention. FIG. 8 is a diagram showing an exemplary sequence of recovery transmission processing of the target packet in the broadcast system according to the embodiment of the present invention. FIG. 9 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention. FIG. 10 is a diagram showing an example of a recovery packet processing sequence of the target packet in the broadcast system according to the embodiment of the present invention.

  First, the contents of the embodiment of the present invention will be listed and described.

  (1) A gateway device according to an embodiment of the present invention includes a reception unit that receives and outputs a packet, a transmission unit that transmits the packet received from the reception unit, and a storage unit, and the reception unit Whether the received packet is a stream in which content information is divided into a plurality of packets, is a stream requested from a broadcast receiving apparatus, and is a target packet that is the packet of a multicast or broadcast stream The packet is stored in the storage unit when the received packet is the target packet, and the transmission unit further receives a retransmission request from the broadcast receiving device, The target packet stored in the transmission unit is transmitted to the broadcast receiving apparatus.

  As described above, the received data is a multicast or broadcast stream that is difficult to retransmit, and the stream requested from the terminal side, that is, the broadcast receiving apparatus is identified on the relay side, and the stream is transferred to the terminal side. A storage environment for caching the stream is secured and saved, and when there is a request from the terminal side, it is retransmitted. In the case of deterioration, it is possible to recover a missing reception stream on the terminal side. Therefore, the gateway device according to the embodiment of the present invention can provide a communication service with high user satisfaction that can receive a stream more stably.

  (2) Preferably, the transmission unit receives the retransmission request and transmits the target packet received from the reception unit to the broadcast reception device, instead of transmitting the target packet stored in the storage unit, Transmitting to the broadcast receiving device at a higher speed than when not receiving the retransmission request, when the predetermined condition is satisfied, the transmission of the target packet stored in the storage unit is stopped, and the received from the receiving unit Resume transmission of the target packet.

  With such a configuration, it is possible to catch up with the terminal side to the real-time broadcast while recovering the loss of the received stream on the terminal side with a simple process of increasing the transmission speed of the stream.

  (3) Preferably, the transmission unit receives the retransmission request and transmits the target packet received from the reception unit to the broadcast reception device, instead of transmitting the target packet stored in the storage unit, Transmit to the broadcast receiving apparatus at the same speed as when the retransmission request is not received.

  With such a configuration, the terminal side can be caught up with real-time broadcasting while recovering the loss of the received stream without changing the packet reception speed on the terminal side.

  (4) Preferably, the transmission unit receives the retransmission request, transmits the target packet received from the reception unit to the broadcast receiving device, and broadcasts the target packet stored in the storage unit When transmission to the receiving apparatus is performed in parallel and a predetermined condition is satisfied, transmission of the target packet stored in the storage unit is stopped.

  With such a configuration, it is possible to recover the loss of the received stream, for example, by additionally using an existing communication method without changing the existing real-time transfer mechanism.

  (5) The broadcast receiving apparatus according to the embodiment of the present invention is a stream in which content information is divided into a plurality of packets, and is transmitted from the gateway apparatus capable of relaying the packets of the multicast or broadcast stream. A receiving unit that receives the target packet that is the packet requested by the broadcast receiving device, and a recovery transmission inquiry of the target packet that is transmitted from the gateway device to the broadcast receiving device and stored in the gateway device. A transmission unit that transmits to the gateway device, and the reception unit receives a response to the recovery transmission inquiry from the gateway device, and changes the reception operation of the target packet according to the content of the response.

  In this way, the gateway apparatus is inquired as to whether it has a cache and retransmission function of a multicast or broadcast stream that is difficult to retransmit and is stored on the relay side, and the stream according to the response content to the inquiry With the configuration in which the reception operation is changed, when the communication environment for transmitting a stream deteriorates, the terminal side can correctly receive the retransmitted stream and recover the loss of the received stream. Therefore, the broadcast receiving apparatus according to the embodiment of the present invention can provide a communication service with high user satisfaction that can receive a stream more stably.

  (6) Preferably, the transmission unit transmits the transmission request for the stream to the gateway device as a retransmission request for the target packet after the reception unit receives the response.

  With such a configuration, for example, the gateway device can transfer the transmission request to the higher-level device, so that the higher-level device cannot confirm the existence of the lower-level device and the stream transmission is stopped. Can be avoided. In other words, even if communication between the gateway device and the broadcast receiving device is interrupted, the precondition for performing recovery transmission of the target packet that the stream continues to arrive at the gateway device from the upper side can be satisfied more reliably. .

  (7) A broadcast relay method according to an embodiment of the present invention is a broadcast relay method in a gateway device including a storage unit, and includes a step of transmitting a received packet, and the received packet includes a plurality of pieces of content information. It is a stream divided into packets, is a stream requested from a broadcast receiving device, and identifies whether it is a target packet that is the packet of a multicast or broadcast stream, and the received packet is the target packet And storing the packet in the storage unit, and receiving the retransmission request from the broadcast receiving device and transmitting the target packet stored in the storage unit to the broadcast receiving device. .

  As described above, the received data is a multicast or broadcast stream that is difficult to retransmit, and the stream requested from the terminal side, that is, the broadcast receiving apparatus is identified on the relay side, and the stream is transferred to the terminal side. A storage environment for caching the stream is secured and saved, and when there is a request from the terminal side, it is retransmitted, so that the communication environment for transmitting the stream is efficiently saved while saving the stream. In the case of deterioration, it is possible to recover a missing reception stream on the terminal side. Therefore, in the broadcast relay method according to the embodiment of the present invention, it is possible to provide a communication service with high user satisfaction that can receive a stream more stably.

  (8) A broadcast receiving method according to an embodiment of the present invention is a broadcast receiving method in a broadcast receiving apparatus, which is a stream in which content information is divided into a plurality of packets and is a multicast or broadcast stream. Receiving a target packet that is the packet requested by the broadcast receiving device from the gateway device capable of relaying the packet; transmitted from the gateway device to the broadcast receiving device; and stored in the gateway device Transmitting a recovery transmission inquiry of the target packet to the gateway apparatus; receiving a response to the recovery transmission inquiry from the gateway apparatus; and changing a reception operation of the target packet according to the content of the response Including.

  In this way, the gateway apparatus is inquired as to whether it has a cache and retransmission function of a multicast or broadcast stream that is difficult to retransmit and is stored on the relay side, and the stream according to the response content to the inquiry If the communication environment for transmitting a stream is deteriorated by changing the reception operation, the terminal side can correctly receive the retransmitted stream and recover the loss of the received stream. Therefore, in the broadcast receiving method according to the embodiment of the present invention, it is possible to provide a communication service with high user satisfaction that can receive a stream more stably.

  (9) A broadcast relay program according to an embodiment of the present invention is a broadcast relay program used in a gateway device, and receives a packet from a computer and outputs the packet, and the packet received from the receiver Is a program for functioning as a transmission unit and a storage unit. The reception unit is a stream in which the received packet is a stream obtained by dividing content information into a plurality of packets. And whether the packet is a target packet that is the packet of a multicast or broadcast stream, and stores the packet in the storage unit when the received packet is the target packet And the transmitter further receives a retransmission request from the broadcast receiver. Transmitting the subject packet stored in the storage unit to the broadcast receiving apparatus.

  As described above, the received data is a multicast or broadcast stream that is difficult to retransmit, and the stream requested from the terminal side, that is, the broadcast receiving apparatus is identified on the relay side, and the stream is transferred to the terminal side. A storage environment for caching the stream is secured and saved, and when there is a request from the terminal side, it is retransmitted. In the case of deterioration, it is possible to recover a missing reception stream on the terminal side. Therefore, the broadcast relay program according to the embodiment of the present invention can provide a communication service with high user satisfaction that can receive a stream more stably.

  (10) A broadcast receiving program according to an embodiment of the present invention is a broadcast receiving program used in a broadcast receiving apparatus, which is a stream in which content information is divided into a plurality of packets and is multicast or A receiving unit that receives a target packet that is the packet requested by the broadcast receiving device from the gateway device capable of relaying the packet of the stream to be broadcast; and is transmitted from the gateway device to the broadcast receiving device; and And a transmission unit that transmits a recovery transmission inquiry of the target packet stored in the gateway device to the gateway device. The reception unit sends a response to the recovery transmission inquiry to the gateway device. Receiving and changes the reception operation of the target packet according to the content of the response.

  In this way, the gateway apparatus is inquired as to whether it has a cache and retransmission function of a multicast or broadcast stream that is difficult to retransmit and is stored on the relay side, and the stream according to the response content to the inquiry With the configuration in which the reception operation is changed, when the communication environment for transmitting a stream deteriorates, the terminal side can correctly receive the retransmitted stream and recover the loss of the received stream. Therefore, the broadcast reception program according to the embodiment of the present invention can provide a communication service with a high degree of user satisfaction that can receive a stream more stably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated. Moreover, you may combine arbitrarily at least one part of embodiment described below.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a broadcasting system according to an embodiment of the present invention.

  Referring to FIG. 1, a broadcast system 301 is a broadcast system that provides, for example, an IPTV service, and includes a server 201, routers 151, 152A, and 152B, and broadcast receiving apparatuses 101A and 101B.

  Hereinafter, each of the broadcast receiving apparatuses 101A and 101B may be referred to as a broadcast receiving apparatus 101.

  In FIG. 1, three routers are representatively shown, but the broadcast system 301 may be configured to further include a small number or a large number of routers. In FIG. 1, two broadcast receiving apparatuses 101 are representatively shown, but the broadcast system 301 may be configured to further include a small number or a large number of broadcast receiving apparatuses 101.

  The broadcast receiving apparatus 101 is, for example, an STB (Set Top Box), and can receive content by digital broadcasting and IP broadcasting such as VOD (Video On Demand), and can record and reproduce the received content. . The broadcast receiving apparatus 101 is connected to the server 201 via a network such as the Internet.

  The server 201 is installed in, for example, an IP broadcaster's facility, and is connected to the broadcast receiving apparatuses 101A and 101B via the routers 151, 152A and 152B constituting the network, and each broadcast is transmitted via the network. Communication with the receiving apparatus 101 is possible.

  The router 151 is connected to the upper server 201 and the lower routers 152A and 152B. The routers 152A and 152B are connected to the upper router 151 and the lower broadcast receiving apparatuses 101A and 101B.

  The server 201 transmits a stream for transmitting content such as video and music. This stream is premised on, for example, one-to-many communication push distribution, and basically cannot be retransmitted.

  Specifically, the server 201 multicasts a stream for transmitting content such as video and music. In this stream, for example, content information is divided into a plurality of IP packets, and a multicast address is inserted into the destination address field of the IP packet.

  Each of the routers 151, 152A, and 152B includes a plurality of communication units capable of transmitting the received IP packet. The communication unit receives a JOIN message from the broadcast receiving apparatus 101, and transmits a packet to the transmission source of the JOIN message. Start sending. The JOIN message is a message for requesting multicast distribution described in Non-Patent Document 1, for example.

  More specifically, the routers 151, 152A, and 152B have a plurality of communication ports. When a JOIN message that is a stream transmission request is received from the lower side, the routers 151, 152A, and 152B receive the JOIN message from the server 201 via the communication port. Transfer the stream. On the other hand, the routers 151, 152A, and 152B do not transfer a stream from the server 201 via a communication port that has not received a JOIN message.

  For example, the broadcast receiving apparatus 101 transmits a multicast address of a stream to be received included in a JOIN message.

  When the routers 151, 152A, and 152B hold the multicast address included in the received JOIN message and receive an IP packet having the held multicast address as the destination address from the upper side, the received packet is sent via the corresponding communication port. Transfer to the lower side.

  Also, the routers 151, 152A, and 152B receive the Leave message from the broadcast receiving apparatus 101, and stop transmission of the stream indicated by the Leave message to the transmission source of the Leave message, that is, transfer via the corresponding communication port. To do. The Leave message is a message for requesting a multicast distribution stop described in Non-Patent Document 1, for example.

  For example, the broadcast receiving apparatus 101 transmits a Leave message including the multicast address of the stream whose reception is to be stopped to the upper side.

  The routers 151, 152A, and 152B discard the same multicast address included in the received Leave message among the held multicast addresses.

  Further, the routers 152A and 152B transfer the JOIN message and the Leave message received from the broadcast receiving apparatus 101 to the router 151.

  When the routers 151, 152A, and 152B perform data transmission by wireless communication using, for example, a wireless LAN, the wireless channel corresponds to a communication port.

  The routers 151, 152A, and 152B may be configured to simply broadcast to the lower side without limiting the transfer destination of the stream from the server 201.

  FIG. 2 is a diagram showing in detail a part of the configuration of the broadcast system according to the embodiment of the present invention.

  With reference to FIG. 2, the broadcast system 301 includes a display device 91, a storage device 92, a broadcast reception device 101, and a gateway device 111.

  The gateway device 111 is, for example, a home gateway (HGW), has a router function shown in FIG. 1, and is connected between the router 151 and the broadcast receiving device 101.

  Each of the gateway device 111 and the broadcast receiving device 101 has one or a plurality of communication ports that provide a network interface between the two devices, wireless communication such as a wireless LAN (Local Area Network), and wired such as a wired LAN. It is possible to communicate with each other. FIG. 2 representatively shows a case where each of the gateway device 111 and the broadcast receiving device 101 has one communication port.

  The broadcast receiving apparatus 101 can record and play back content received from the server 201 via a network, for example. More specifically, the broadcast receiving apparatus 101 can store the content in the storage device 92 or output the content of the content to a display device 91 such as a display.

  FIG. 3 is a diagram showing a configuration of the gateway device in the broadcasting system according to the embodiment of the present invention.

  Referring to FIG. 3, gateway device 111 includes network side communication unit (reception unit) 21, terminal side communication unit (transmission unit) 22, control unit 23, and storage unit 24.

  The network side communication unit 21 receives an IP packet from the upper side and outputs it to the terminal side communication unit 22.

  The terminal side communication unit 22 transmits the IP packet received from the network side communication unit 21 to the lower side.

  Further, the network side communication unit 21 is a stream in which content information is divided into a plurality of packets received from the host side, is a stream requested from the broadcast receiving apparatus 101, and is multicast or broadcast. It is possible to identify whether or not the target packet is the packet of the stream. The network side communication unit 21 stores the packet in the storage unit 24 when the received packet is a target packet.

  More specifically, the terminal side communication unit 22 caches the multicast address included in the JOIN message received from the lower side, that is, stores it in the storage unit 24.

  When the multicast address of the received target packet matches the multicast address stored in the storage unit 24, the network side communication unit 21 stores the target packet in the storage unit 24 and outputs it to the terminal side communication unit 22 . For example, in the storage unit 24, the target packet can be stored in a certain amount, and when the storage amount exceeds the certain amount, the old target packet is deleted in order.

  On the other hand, when the address that matches the multicast address of the received target packet is not stored in the storage unit 24, the network side communication unit 21 discards the target packet.

  In addition to transmitting the IP packet such as the target packet received from the network side communication unit 21 to the lower side, the terminal side communication unit 22 receives a retransmission request from the broadcast receiving apparatus 101, for example, a JOIN message, and stores the storage unit 24. The target packet stored in is transmitted to the broadcast receiving apparatus 101.

  In addition, the terminal-side communication unit 22 validates the cache until the Leave message is received. Specifically, the terminal side communication unit 22 deletes from the storage unit 24 the same address as the multicast address included in the Leave message received from the lower side and the target packet of the multicast address. That is, even when the communication connection between the broadcast receiving apparatus 101 and the gateway apparatus 111 is disconnected, if the Leave message has not arrived from the broadcast receiving apparatus 101, the gateway apparatus 111 continues to transmit and store the target packet. .

  FIG. 4 is a diagram showing a configuration of a broadcast receiving apparatus in the broadcast system according to the embodiment of the present invention.

  Referring to FIG. 4, broadcast receiving apparatus 101 includes control unit 11, communication unit (reception unit and transmission unit) 12, buffer 14, stream processing unit 16, and reception unit 17.

  In FIG. 4, one communication unit is representatively shown, but the broadcast receiving apparatus 101 may be configured to include a plurality of communication units. For example, the plurality of communication units receive packets using different types of communication methods.

  Specifically, the reception unit 17 receives a user operation and outputs operation information indicating the content of the received operation to the control unit 11.

  When the operation information received from the receiving unit 17 indicates content selection such as a program by the user, the control unit 11 creates a JOIN message including a multicast address corresponding to the selected content and outputs the message to the communication unit 12.

  The communication unit 12 transmits the JOIN message received from the control unit 11 to the gateway device 111.

  In addition, when the operation information received from the receiving unit 17 indicates that content distribution of a program or the like by the user is stopped, the control unit 11 creates a Leave message including a multicast address corresponding to the content to be stopped and sends it to the communication unit 12. Output.

  The communication unit 12 transmits the Leave message received from the control unit 11 to the gateway device 111.

  Further, the communication unit 12 is a gateway device capable of relaying an IP packet constituting a stream, specifically, a stream in which content information is divided into a plurality of packets, and the multicast or broadcast stream. From 111, the target packet, which is the packet requested by its own broadcast receiving apparatus 101, is received.

  More specifically, the communication unit 12 extracts, for example, an RTP (Real-time Transport Protocol) packet from a plurality of IP packets received from the gateway device 111 by wireless communication, for example, and stores the extracted RTP packet in the buffer 14.

  In addition, the communication unit 12 transmits a recovery transmission inquiry of the target packet transmitted from the gateway device 111 to the broadcast receiving device 101 and stored in the gateway device 111, to the gateway device 111.

  The communication unit 12 receives a response to the recovery transmission inquiry from the gateway device 111 and changes the reception operation of the target packet according to the content of the response.

  Further, for example, after the communication unit 12 receives the response, the communication unit 12 transmits a stream transmission request to the gateway device 111 as a retransmission request.

  The control unit 11 acquires the RTP packet stored in the buffer 14 and stores it in the storage device 92. For example, when a predetermined number of RTP packets are accumulated in the buffer 14, the control unit 11 collects these RTP packets and stores them in the storage device 92.

  For example, the stream processing unit 16 acquires an RTP packet stored in the storage device 92, performs a decoding process on the acquired RTP packet, generates a video signal and an audio signal, and outputs the video signal and the audio signal to the display device 91.

  The display device 91 reproduces content such as a program based on the video signal and the audio signal received from the stream processing unit 16.

  The broadcast receiving apparatus 101 may be configured to include at least one of the display device 91 and the storage device 92.

[Operation]
Next, a stream transmission process in the broadcasting system according to the embodiment of the present invention will be described with reference to the drawings.

  Each device in the broadcasting system 301 includes a computer, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step of the following flowcharts and sequences from a memory (not shown) and executes the program. Each of the programs of the plurality of apparatuses can be installed from the outside. The programs of the plurality of apparatuses are distributed while being stored in a recording medium.

[Operation Example 1]
FIG. 5 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention.

  Referring to FIG. 5, when gateway apparatus 111 receives a JOIN message corresponding to a retransmission request from broadcast receiving apparatus 101, it starts recovery transmission processing. More specifically, the gateway device 111 stops the real-time transfer of the corresponding stream, and receives the corresponding target packet stored in the multicast cache, that is, the storage unit 24, at a speed higher than the transmission speed in the real-time transfer. Send to device 101.

  Specifically, when target packets for X seconds are stored in the multicast cache, for example: The target packet is transmitted to the broadcast receiving apparatus 101 at the Y-times speed. As a result, X / 0. You can catch up with real-time broadcasting in Y seconds.

  The gateway device 111 may be configured to transmit the target packet to the broadcast receiving device 101 at a double speed or higher in the recovery transmission process.

  FIG. 6 is a diagram showing an example of a recovery packet processing sequence of the target packet in the broadcast system according to the embodiment of the present invention.

  In the gateway device 111, the terminal side communication unit 22 receives the retransmission request from the broadcast receiving device 101 and saves the target packet received from the network side communication unit 21 in the storage unit 24 instead of transmitting it to the broadcast receiving device 101. The received target packet is transmitted to the broadcast receiving apparatus 101 at a higher speed than when the retransmission request is not received. Then, when the predetermined condition is satisfied, the terminal side communication unit 22 stops the transmission of the target packet stored in the storage unit 24 and restarts the transmission of the target packet received from the network side communication unit 21.

  Specifically, referring to FIG. 6, first, when content is selected in broadcast receiving device 101, control unit 11 sends a JOIN message including the multicast address of the selected content to gateway device 111 via communication unit 12. Transmit (step S1).

  Next, the terminal side communication unit 22 in the gateway device 111 stores the multicast address included in the received JOIN message in the storage unit 24 and outputs it to the network side communication unit 21. The network side communication unit 21 transmits the JOIN message received from the terminal side communication unit 22 to the router 151 (step S2).

  Next, the router 151 receives the JOIN message from the gateway device 111, and starts to transfer the IP packet constituting the multicast address stream included in the received JOIN message to the gateway device 111 (step S3).

  Next, in the gateway device 111, the network side communication unit 21 refers to the multicast address stored in the storage unit 24, so that the IP packet received from the router 151 is the IP packet of the stream to be transferred, that is, the target packet. It is identified (step S4).

  Next, the network side communication unit 21 transmits the identified target packet to the broadcast receiving device 101 via the terminal side communication unit 22 (step S5) and stores it in the storage unit 24 (step S6).

  Next, the control unit 11 in the broadcast receiving apparatus 101 performs a recording process for storing the RTP packet extracted from the received target packet in the storage device 92 (step S7).

  Next, in a state where the recording process is being performed in the broadcast receiving apparatus 101, the control unit 11 detects disconnection of the communication connection with the gateway apparatus 111 (step S8).

  Next, when the communication connection with the gateway device 111 is re-established (step S9), the control unit 11 creates a recovery transmission inquiry for the target packet and transmits it to the gateway device 111 via the communication unit 12. The recovery transmission inquiry is a message for inquiring whether or not the gateway apparatus 111 has the function of caching and retransmitting the target packet, and includes, for example, the multicast address of the content to be recovered (step S10).

  Next, the terminal side communication unit 22 in the gateway apparatus 111 receives the recovery transmission inquiry from the broadcast receiving apparatus 101, and transmits an ACK to the broadcast receiving apparatus 101 when it has a function of caching and retransmitting the target packet ( Step S11).

  Next, the communication unit 12 in the broadcast receiving apparatus 101 receives an ACK from the gateway apparatus 111 and performs a preparation process for receiving a target packet to be retransmitted. Here, the communication unit 12 includes: The reception operation for correctly receiving and processing the target packet transmitted at the Y-times speed is changed (step S12).

  Next, when the preparation process of the communication unit 12 is completed, the control unit 11 in the broadcast receiving apparatus 101 transmits a JOIN message including the multicast address of the content to be recovered as a retransmission request to the gateway apparatus 111 via the communication unit 12. . Note that this JOIN message may be, for example, a value obtained by changing some field values in a normal JOIN message (step S13).

  Next, the terminal side communication unit 22 in the gateway device 111 confirms that the multicast address included in the received JOIN message is a recovery transmission target by referring to the address stored in the storage unit 24, for example. A JOIN message is transmitted to the router 151 via the network side communication unit 21 (step S14), and recovery transmission processing is started.

  More specifically, the terminal-side communication unit 22 stops real-time transfer of the target packet, that is, stops transmission of the target packet received from the network-side communication unit 21 to the broadcast receiving device 101 (step S15) and stores it. The target packet stored in the unit 24 is The data is transmitted to the broadcast receiving apparatus 101 at the Y speed. Here, the network side communication unit 21 continues to store the target packet received from the router 151 in the storage unit 24 (steps S16 and S17).

  Next, the control unit 11 in the broadcast receiving apparatus 101 monitors the target packet from the gateway apparatus 111. More specifically, the control unit 11 monitors, for example, the sequence numbers of RTP packets stored in the buffer 14, and confirms that RTP packets that have not been received due to the disconnection of the communication connection are complete, that is, the RTP packets are seamlessly displayed. It is confirmed that it has been received (step S18).

  Next, when the terminal side communication unit 22 in the gateway device 111 completes transmission of the recovery target packet, for example, all the target packets stored in the storage unit 24 at the start of the recovery transmission process are transmitted to the broadcast receiving device 101. (Step S19), the recovery transmission process is terminated and real-time transfer is resumed (Step S20), and the target packet received from the network side communication unit 21 is transmitted to the broadcast receiving apparatus 101 (Step S21).

  The broadcast receiving apparatus 101 may be configured to recognize the end of the recovery transmission process by the gateway apparatus 111 by a notification from the gateway apparatus 111 and restore the reception operation of the target packet, or to cut off the RTP packet. The configuration may be such that the reception operation of the target packet is restored when it is confirmed that it has been received without any errors.

[Operation example 2]
FIG. 7 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention.

  Referring to FIG. 7, when gateway apparatus 111 receives a JOIN message corresponding to a retransmission request from broadcast receiving apparatus 101, gateway apparatus 111 starts recovery transmission processing. More specifically, the gateway device 111 stops real-time transfer of the corresponding stream, and the corresponding target packet stored in the multicast cache, that is, the storage unit 24 is subsequently broadcast-received at the same transmission rate as the real-time transfer. 101.

  Specifically, when target packets for X seconds are stored in the multicast cache, the state in which the stream reception in the broadcast receiving apparatus 101 is delayed by X seconds with respect to the real-time broadcast continues.

  FIG. 8 is a diagram showing an exemplary sequence of recovery transmission processing of the target packet in the broadcast system according to the embodiment of the present invention.

  In the gateway device 111, the terminal side communication unit 22 receives the retransmission request from the broadcast receiving device 101 and saves the target packet received from the network side communication unit 21 in the storage unit 24 instead of transmitting it to the broadcast receiving device 101. The received target packet is transmitted to the broadcast receiving apparatus 101 at the same speed as when the retransmission request is not received.

  Specifically, referring to FIG. 8, the operations of steps S31 to S41 are the same as steps S1 to S11 in the sequence shown in FIG.

  Next, the communication unit 12 in the broadcast receiving apparatus 101 receives an ACK from the gateway apparatus 111 and performs a preparation process for receiving a target packet to be retransmitted. Here, the communication unit 12 changes the reception operation for correctly receiving and processing a target packet transmitted with a delay of X seconds at 1.0 times speed. Note that the communication unit 12 may be configured not to perform the preparation process when it is not necessary to change the reception operation even if the target packet is transmitted with a delay of X seconds (step S42).

  Next, when the preparation process of the communication unit 12 is completed, the control unit 11 in the broadcast receiving apparatus 101 transmits a JOIN message including the multicast address of the content to be recovered as a retransmission request to the gateway apparatus 111 via the communication unit 12. . Note that this JOIN message may be, for example, a value obtained by changing some field values in a normal JOIN message (step S43).

  Next, the terminal side communication unit 22 in the gateway device 111 confirms that the multicast address included in the received JOIN message is a recovery transmission target by referring to the address stored in the storage unit 24, for example. A JOIN message is transmitted to the router 151 via the network side communication unit 21 (step S44), and recovery transmission processing is started.

  More specifically, the terminal-side communication unit 22 stops real-time transfer of the target packet, that is, stops transmission of the target packet received from the network-side communication unit 21 to the broadcast receiving device 101 (step S45) and stores it. The target packet stored in the unit 24 is transmitted to the broadcast receiving apparatus 101 at 1.0 times speed. Here, the network side communication unit 21 continues to store the target packet received from the router 151 in the storage unit 24 (steps S46 and S47).

  Next, the control unit 11 in the broadcast receiving apparatus 101 monitors the target packet from the gateway apparatus 111. More specifically, the control unit 11 monitors, for example, the sequence numbers of RTP packets stored in the buffer 14, and confirms that RTP packets that have not been received due to the disconnection of the communication connection are complete, that is, the RTP packets are seamlessly displayed. It is confirmed that it has been received (step S48).

[Operation Example 3]
FIG. 9 is a diagram showing an overview of target packet recovery transmission processing in the broadcast system according to the embodiment of the present invention.

  Referring to FIG. 9, when gateway apparatus 111 receives a JOIN message corresponding to a retransmission request from broadcast receiving apparatus 101, gateway apparatus 111 starts recovery transmission processing. More specifically, the gateway device 111 continues the real-time transfer of the corresponding stream, and sets the corresponding target packet stored in the multicast cache, that is, the storage unit 24 as a stream different from the corresponding stream, for example, TCP. It transmits to the broadcast receiving apparatus 101 by communication. The gateway device 111 may be configured to reconstruct an IP packet including a part of data included in the target packet and transmit it to the broadcast receiving device 101.

  For example, in the operation example 3, the recovery transmission process can be completed earlier than the operation example 1 depending on the communication environment. On the other hand, in the operation example 1, compared with the operation example 3, the recovery transmission process can be completed stably in a fixed time.

  FIG. 10 is a diagram showing an example of a recovery packet processing sequence of the target packet in the broadcast system according to the embodiment of the present invention.

  In the gateway device 111, the terminal side communication unit 22 receives a retransmission request from the broadcast receiving device 101, transmits the target packet received from the network side communication unit 21 to the broadcast receiving device 101, and is stored in the storage unit 24. When the target packet is transmitted to the broadcast receiving apparatus 101 in parallel and a predetermined condition is satisfied, the transmission of the target packet stored in the storage unit 24 is stopped.

  Specifically, referring to FIG. 10, the operations of steps S51 to S61 are the same as steps S1 to S11 in the sequence shown in FIG.

  Next, the communication unit 12 in the broadcast receiving apparatus 101 receives an ACK from the gateway apparatus 111 and performs a preparation process for receiving a target packet to be retransmitted. Here, the communication unit 12 changes the reception operation for correctly receiving and processing a target packet separately transmitted by TCP communication (step S62).

  Next, when the preparation process of the communication unit 12 is completed, the control unit 11 in the broadcast receiving apparatus 101 transmits a JOIN message including the multicast address of the content to be recovered as a retransmission request to the gateway apparatus 111 via the communication unit 12. . Note that this JOIN message may be, for example, a value obtained by changing some field values in a normal JOIN message (step S63).

  Next, the terminal side communication unit 22 in the gateway device 111 confirms that the multicast address included in the received JOIN message is a recovery transmission target by referring to the address stored in the storage unit 24, for example. A JOIN message is transmitted to the router 151 via the network side communication unit 21 (step S64), and recovery transmission processing is started.

  More specifically, the terminal-side communication unit 22 continues real-time transfer of the target packet (step S65), and continues to transmit the target packet received from the network-side communication unit 21 to the broadcast receiving device 101 (step S66). ), And transmits the target packet stored in the storage unit 24 to the broadcast receiving apparatus 101 by TCP communication. Here, the network side communication unit 21 continues to store the target packet received from the router 151 in the storage unit 24 (steps S67 and S68).

  Next, the control unit 11 in the broadcast receiving apparatus 101 monitors the target packet from the gateway apparatus 111. More specifically, the control unit 11 monitors, for example, the sequence numbers of RTP packets stored in the buffer 14, and confirms that RTP packets that have not been received due to the disconnection of the communication connection, that is, the RTP packets are seamless It is confirmed that it has been received (step S69).

  Next, when the terminal side communication unit 22 in the gateway device 111 completes transmission of the recovery target packet, for example, all the target packets stored in the storage unit 24 at the start of the recovery transmission process are transmitted to the broadcast receiving device 101. Then, the recovery transmission process is terminated (step S70).

  The broadcast receiving apparatus 101 may be configured to recognize the end of the recovery transmission process by the gateway apparatus 111 by a notification from the gateway apparatus 111 and restore the reception operation of the target packet, or to cut off the RTP packet. The configuration may be such that the reception operation of the target packet is restored when it is confirmed that it has been received without any errors.

  Further, in the operation examples 1 to 3 (steps S13, S33, or S53), when the broadcast receiving apparatus 101 transmits a JOIN message having a content different from a normal JOIN message to the gateway apparatus 111, the gateway apparatus 111 receives, for example, The JOIN message is converted into a normal JOIN message and transmitted to the router 151.

  In operation examples 1 to 3, for example, the gateway device 111 retransmits all the target packets stored in the multicast cache at the start of the recovery transmission process, for example.

  In this case, the broadcast receiving apparatus 101 selects the retransmitted target packet with reference to, for example, a sequence number included in the RTP packet.

  With such a configuration, the recovery transmission process by the gateway apparatus 111 and the retransmission request process by the broadcast receiving apparatus 101 can be simplified.

  Alternatively, for example, the broadcast receiving apparatus 101 transmits the sequence number of the RTP packet that needs to be retransmitted to the gateway apparatus 111 by including it in the JOIN message.

  The gateway device 111 retransmits the target packets after the sequence number designated by the JOIN message from the broadcast receiving device 101.

  With such a configuration, it is possible to efficiently use the band between the gateway device 111 and the broadcast receiving device 101, and to recover the loss of the received stream at an early stage.

  By the way, for example, in homes and offices where the IPTV service as described above is provided, when the communication environment for transmitting the stream deteriorates, the data of the stream is interrupted and the viewing content of the broadcast program is lost. There is.

  Specifically, in recent years, the Internet connection using a wireless LAN has become the majority of home terminals. Wireless communication is less stable than wired communication, and communication with a terminal may be interrupted due to temporary deterioration of the reception environment, encryption key update, or the like. The same applies to cases where data cannot be received temporarily due to switching from wireless communication to wired communication at the terminal, or due to a reason on the terminal side, other than communication interruption in wireless communication.

  Here, for example, in the case of a TCP-based retransmittable communication service, it is possible to recover missing data at the time of reconnection of a terminal. It is difficult to recover.

  In particular, when the user is watching the content, the user can be notified of the cause of the video disruption in some way and the user may be convinced to some extent, but the content is recorded in the background. If the communication is interrupted in a situation that the user cannot recognize, as in the case where the user is watching, and then the user views the recorded content and the video is missing, the user's dissatisfaction level will increase. .

  In contrast, in the gateway device according to the embodiment of the present invention, network side communication unit 21 receives and outputs a packet. The terminal-side communication unit 22 transmits the message received from the network-side communication unit 21. The network side communication unit 21 is a stream in which the content information is divided into a plurality of packets, a stream requested from the broadcast receiving apparatus 101, and a corresponding packet of a multicast or broadcast stream. Whether or not the packet is a certain target can be identified. The network side communication unit 21 stores the packet in the storage unit 24 when the received packet is a target packet. The terminal-side communication unit 22 further receives a retransmission request from the broadcast receiving apparatus 101 and transmits the target packet stored in the storage unit 24 to the broadcast receiving apparatus 101.

  In this way, the received data is a multicast or broadcast stream that is difficult to retransmit, and the terminal side, that is, the stream requested from the broadcast receiving apparatus 101 is identified on the relay side, and the stream is transferred to the terminal side. In addition, a storage environment for caching the stream is ensured and saved, and when there is a request from the terminal side, it is retransmitted, so that the stream is efficiently saved and the stream is transmitted. In the case where the quality deteriorates, it is possible to recover the loss of the received stream on the terminal side.

  Therefore, the gateway device according to the embodiment of the present invention can provide a communication service with high user satisfaction that can receive a stream more stably.

  In the gateway device according to the embodiment of the present invention, the terminal-side communication unit 22 receives a retransmission request from the broadcast receiving device 101 and transmits the target packet received from the network-side communication unit 21 to the broadcast receiving device 101. Instead, the target packet stored in the storage unit 24 is transmitted to the broadcast receiving apparatus 101 at a higher speed than when the retransmission request is not received. Then, when the predetermined condition is satisfied, the terminal side communication unit 22 stops the transmission of the target packet stored in the storage unit 24 and restarts the transmission of the target packet received from the network side communication unit 21.

  With such a configuration, it is possible to catch up with the terminal side to the real-time broadcast while recovering the loss of the received stream on the terminal side with a simple process of increasing the transmission speed of the stream.

  In the gateway device according to the embodiment of the present invention, the terminal-side communication unit 22 receives a retransmission request from the broadcast receiving device 101 and transmits the target packet received from the network-side communication unit 21 to the broadcast receiving device 101. Instead, the target packet stored in the storage unit 24 is transmitted to the broadcast receiving apparatus 101 at the same speed as when no retransmission request is received.

  With such a configuration, the terminal side can be caught up with real-time broadcasting while recovering the loss of the received stream without changing the packet reception speed on the terminal side.

  In the gateway device according to the embodiment of the present invention, the terminal-side communication unit 22 receives a retransmission request from the broadcast receiving device 101 and sends the target packet received from the network-side communication unit 21 to the broadcast receiving device 101. Transmission and transmission of the target packet stored in the storage unit 24 to the broadcast receiving apparatus 101 are performed in parallel, and when a predetermined condition is satisfied, transmission of the target packet stored in the storage unit 24 is stopped.

  With such a configuration, it is possible to recover the loss of the received stream, for example, by additionally using an existing communication method without changing the existing real-time transfer mechanism.

  In the broadcast receiving apparatus according to the embodiment of the present invention, the communication unit 12 is a gateway in which the content information is a stream divided into a plurality of packets and can relay the packets of the multicast or broadcast stream. From the device 111, the target packet that is the packet requested by the own broadcast receiving device 101 is received. The communication unit 12 transmits to the gateway device 111 a recovery transmission inquiry of the target packet transmitted from the gateway device 111 to the broadcast receiving device 101 and stored in the gateway device 111. And the communication part 12 receives the response with respect to a recovery transmission inquiry from the gateway apparatus 111, and changes the reception operation | movement of an object packet according to the content of the said response.

  In this way, the gateway apparatus 111 is inquired as to whether or not it has a cache and retransmission function of a multicast or broadcast stream that is stored on the relay side and is difficult to retransmit, and according to the response content to the inquiry. By changing the stream reception operation, when the communication environment for transmitting the stream deteriorates, the terminal side can correctly receive the retransmitted stream and recover the loss of the received stream.

  Therefore, the broadcast receiving apparatus according to the embodiment of the present invention can provide a communication service with high user satisfaction that can receive a stream more stably.

  In the broadcast receiving apparatus according to the embodiment of the present invention, communication unit 12 transmits a stream transmission request to gateway apparatus 111 as a retransmission request for the target packet after communication unit 12 receives the response.

  With such a configuration, for example, the gateway device 111 can transfer the transmission request to the higher-level device, so that the higher-level device cannot confirm the existence of the lower-level device, and thus the stream transmission is stopped. You can avoid that. In other words, even if communication between the gateway device 111 and the broadcast receiving device 101 is interrupted, the precondition for performing recovery transmission of the target packet that the stream continues to arrive at the gateway device 111 from the upper side is more reliably satisfied. be able to.

  Note that the gateway device and the broadcast receiving device according to the embodiment of the present invention are more effective particularly when applied to services with low real-time properties such as background recording.

  In the broadcast relay method according to the embodiment of the present invention, first, the received packet is transmitted. The received packet is a stream in which content information is divided into a plurality of packets, a stream requested from the broadcast receiving apparatus 101, and a target packet that is the packet of the multicast or broadcast stream. If the received packet is the target packet, the packet is stored in the storage unit 24. Next, in response to a retransmission request from the broadcast receiving apparatus 101, the target packet stored in the storage unit 24 is transmitted to the broadcast receiving apparatus 101.

  In this way, the received data is a multicast or broadcast stream that is difficult to retransmit, and the terminal side, that is, the stream requested from the broadcast receiving apparatus 101 is identified on the relay side, and the stream is transferred to the terminal side. In addition, a storage environment for caching the stream is ensured and saved, and when there is a request from the terminal side, it is retransmitted to efficiently save the stream while transmitting the stream. In the case where the quality deteriorates, it is possible to recover the loss of the received stream on the terminal side.

  Therefore, in the broadcast relay method according to the embodiment of the present invention, it is possible to provide a communication service with high user satisfaction that can receive a stream more stably.

  In the broadcast receiving method according to the embodiment of the present invention, first, the content information is a stream divided into a plurality of packets from the gateway device 111 capable of relaying the packets of the multicast or broadcast stream. The target packet that is the packet requested by its own broadcast receiving apparatus 101 is received. Next, a recovery transmission inquiry of the target packet transmitted from the gateway device 111 to the broadcast receiving device 101 and stored in the gateway device 111 is transmitted to the gateway device 111. Next, a response to the recovery transmission inquiry is received from the gateway device 111, and the reception operation of the target packet is changed according to the content of the response.

  In this way, the gateway apparatus 111 is inquired as to whether or not it has a cache and retransmission function of a multicast or broadcast stream that is stored on the relay side and is difficult to retransmit, and according to the response content to the inquiry. By changing the reception operation of the stream, when the communication environment for transmitting the stream deteriorates, the terminal side can correctly receive the retransmitted stream and recover the loss of the received stream.

  Therefore, in the broadcast receiving method according to the embodiment of the present invention, it is possible to provide a communication service with high user satisfaction that can receive a stream more stably.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The above description includes the following features.

[Appendix 1]
A receiver for receiving and outputting the packet;
A transmission unit for transmitting the packet received from the reception unit;
A storage unit,
The reception unit is a target packet in which the received packet is a stream in which content information is divided into a plurality of packets, is a stream requested from a broadcast receiving apparatus, and is the packet of a multicast or broadcast stream Whether the received packet is the target packet, the packet is stored in the storage unit,
The transmission unit further receives a retransmission request from the broadcast receiving device, and transmits the target packet stored in the storage unit to the broadcast receiving device,
The stream is a stream to be delivered by push,
Receiving the transmission request of the stream transmitted as a retransmission request from the broadcast receiving device, and transmitting the transmission request of the stream based on the received transmission request or the transmission request to the upper side,
The broadcast receiving device is a gateway device that performs a recording process of the content.

[Appendix 2]
A broadcast receiving device,
The content information is a stream divided into a plurality of packets, and the target packet that is the packet requested by the broadcast receiving device is received from the gateway device capable of relaying the packet of the multicast or broadcast stream A receiving unit to
A transmission unit that transmits to the gateway device a recovery transmission inquiry of the target packet that is transmitted from the gateway device to the broadcast receiving device and stored in the gateway device;
The receiving unit receives a response to the recovery transmission inquiry from the gateway device, changes the reception operation of the target packet according to the content of the response,
The stream is a stream to be delivered by push,
further,
A broadcast receiving apparatus provided with the control part which performs the recording process of the said content using the said some target packet received by the said receiving part.

11 control unit 12 communication unit (reception unit and transmission unit)
14 buffer 16 stream processing unit 17 receiving unit 21 network side communication unit (receiving unit)
22 Terminal side communication unit (transmission unit)
23 Control Unit 24 Storage Unit 91 Display Device 92 Storage Device 101, 101A, 101B Broadcast Receiving Device 111 Gateway Device 151, 152A, 152B Router 201 Server 301 Broadcast System

Claims (10)

A receiver for receiving and outputting the packet;
A transmission unit for transmitting the packet received from the reception unit;
A storage unit,
The reception unit is a target packet in which the received packet is a stream in which content information is divided into a plurality of packets, is a stream requested from a broadcast receiving apparatus, and is the packet of a multicast or broadcast stream Whether the received packet is the target packet, the packet is stored in the storage unit,
The transmission unit further receives a retransmission request from the broadcast receiving device, and transmits the target packet stored in the storage unit to the broadcast receiving device.   In response to the retransmission request, the transmitting unit does not receive the retransmission request for the target packet stored in the storage unit, instead of transmitting the target packet received from the receiving unit to the broadcast receiving device. Transmitting to the broadcast receiving device at a faster speed than the case, and when a predetermined condition is satisfied, stops transmission of the target packet stored in the storage unit and resumes transmission of the target packet received from the reception unit The gateway device according to claim 1.   In response to the retransmission request, the transmitting unit does not receive the retransmission request for the target packet stored in the storage unit, instead of transmitting the target packet received from the receiving unit to the broadcast receiving device. The gateway device according to claim 1, wherein the gateway device transmits to the broadcast receiving device at the same speed as the case.   The transmission unit receives the retransmission request, transmits the target packet received from the reception unit to the broadcast reception device, and transmits the target packet stored in the storage unit to the broadcast reception device. The gateway apparatus according to claim 1, wherein the gateway apparatus stops the transmission of the target packet stored in the storage unit when performing in parallel and satisfying a predetermined condition. A broadcast receiving device,
The content information is a stream divided into a plurality of packets, and the target packet that is the packet requested by the broadcast receiving device is received from the gateway device capable of relaying the packet of the multicast or broadcast stream A receiving unit to
A transmission unit that transmits to the gateway device a recovery transmission inquiry of the target packet that is transmitted from the gateway device to the broadcast receiving device and stored in the gateway device;
The broadcast reception device, wherein the reception unit receives a response to the recovery transmission inquiry from the gateway device, and changes the reception operation of the target packet according to the content of the response.   6. The broadcast receiving device according to claim 5, wherein the transmitting unit transmits the transmission request for the stream to the gateway device as a retransmission request for the target packet after the receiving unit receives the response. A broadcast relay method in a gateway device including a storage unit,
Transmitting the received packet; and
Whether the received packet is a stream in which the content information is divided into a plurality of packets, is a stream requested from the broadcast receiving apparatus, and is a target packet that is the packet of the multicast or broadcast stream And storing the packet in the storage unit when the received packet is the target packet;
Receiving the retransmission request from the broadcast receiving apparatus, and transmitting the target packet stored in the storage unit to the broadcast receiving apparatus. A broadcast receiving method in a broadcast receiving apparatus,
The content information is a stream divided into a plurality of packets, and the target packet that is the packet requested by the broadcast receiving device is received from the gateway device capable of relaying the packet of the multicast or broadcast stream And steps to
Transmitting a recovery transmission inquiry of the target packet transmitted from the gateway device to the broadcast receiving device and stored in the gateway device;
Receiving a response to the recovery transmission inquiry from the gateway device, and changing the reception operation of the target packet according to the content of the response. A broadcast relay program used in a gateway device,
Computer
A receiver for receiving and outputting the packet;
A transmission unit for transmitting the packet received from the reception unit;
A storage unit;
As a program to function as
The reception unit is a target packet in which the received packet is a stream in which content information is divided into a plurality of packets, is a stream requested from a broadcast receiving apparatus, and is the packet of a multicast or broadcast stream Whether the received packet is the target packet, the packet is stored in the storage unit,
The transmission unit further receives a retransmission request from the broadcast receiving device, and transmits the target packet stored in the storage unit to the broadcast receiving device. A broadcast receiving program used in a broadcast receiving device,
Computer
The content information is a stream divided into a plurality of packets, and the target packet that is the packet requested by the broadcast receiving device is received from the gateway device capable of relaying the packet of the multicast or broadcast stream A receiving unit to
A transmitting unit that transmits a recovery transmission inquiry of the target packet transmitted from the gateway device to the broadcast receiving device and stored in the gateway device;
As a program to function as
The broadcast receiving program, wherein the reception unit receives a response to the recovery transmission inquiry from the gateway device, and changes the reception operation of the target packet according to the content of the response.

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