CN102006503B - Wideband data communication system and method for integrating IP network and cable television network - Google Patents
Wideband data communication system and method for integrating IP network and cable television network Download PDFInfo
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Abstract
The invention relates to a wideband data communication system and method for integrating an IP network and a cable television network. The method comprises the following steps: a terminal and an integration channel gateway establish an end-to-end two-way channel on the IP network; an IP/digital video broadcasting (DVB) gateway and the cable television network constitutes a one-way communication channel from the integration channel gateway to the terminal; the terminal transmits an uplink IP packet to the integration channel gateway through the two-way communication channel of the IP network, and the integration channel gateway acquires the uplink IP packet from the IP network, inquires an address mapping table, converts the address and transmits the converted uplink IP packet to the IP network; and the integration channel gateway receives a responded downlink IP packet from the IP network, inquires the address mapping table and converts the address, and the integration channel gateway transmits the converted downlink IP packet to the terminal through the two-way channel of the IP network, or through the one-way communication channel composed of the IP/DVB gateway and the cable television network from the integration channel gateway to the terminal or simultaneously through the two-way communication channel and the one-way communication channel.
Description
Technical field
The present invention relates to the broadband data communication technology, particularly merge the broadband data communication system and method for IP network and cable TV network.
Background technology
Cable TV network is the broadband integrated net of broadcasting and TV of point-to-multipoint tree network structure, and this network has the downlink broadcast passage in broadband, comes division signals according to frequency division multiple access.Must solve bidirectional data transfers in order to realize that at cable TV network two-way interactive is professional, realize that the method for bidirectional data transfers is divided into two classes usually: a class adopts and comprises that the technology such as Docsis, MoCA, HiNOC, HomePlug AV, HPHA, WLAN carry out bidirectional rebuilding to cable television network; An other class adopts out-band method to solve transmitting uplink data, such as technology such as ADSL, GPRS, CDMA, Wifi, Bluetooth.
VOD operation system structure chart in IP network and cable TV network and the dis environment, as shown in Figure 1, to merge VOD operation system under IP network and the cable TV network environment as example.System comprises VOD service server, session and resource management server, IP/DVB gateway, top box of digital machine.VOD is professional, and flow process is as follows substantially: top box of digital machine sends order request by IP network to the VOD service server; The VOD service server sends frequency application instruction by IP network to session and resource management server; Session and resource management server distribute idle frequency to be used for this program request, and IP address and the data receiver port of frequency point information, IP/DVB gateway sent to the VOD service server by IP network; The VOD service server sends to top box of digital machine with frequency point information by IP network, and the VOD service server sends to audio, video data the IP/DVB gateway of assigned ip address and port simultaneously; The IP/DVB gateway receives this audio, video data, and these data are converted to moving image MPEG-TS transport stream, and this data communication device is crossed cable TV network and sent to top box of digital machine; The top box of digital machine locked frequency point, and on frequency receive data, decoding after the data transaction is shown.As seen, under two-way IP network and wired TV one-way radio network and the environment deposited, professional usually the employing under the cable TV network of two-way interactive passes content-data, adopts IP network transfer control signaling.
Patents is as follows:
China Patent No. is 200610035447.8 to disclose " a kind of implementation method of the two-way IP transmission system based on cable television network ", and its method is comprised of two-way IP data network, IP/DVB gateway, QAM modulator and digital cable TV net, receiving terminal for digital television box RS232/ procotol transponder.Receiving terminal for digital television sends up IP bag by RS232/ procotol transponder to two-way IP data network.The downstream IP bag sends to receiving terminal for digital television by IP/DVB gateway and QAM modulator by the digital cable TV net.
China Patent No. 200710001262.X discloses " at system, the method and apparatus of separate two-way network providing two-way business ", this patent is for two-way services different in the digital TV network, carry out the signal conversion by different signal conversion equipments, simultaneously also need to be in set-top box integrated different client, carry out corresponding Business Processing.This patent can in separated bidirectional network, be carried out conversion process for various two-way services unification.The method may further comprise the steps: the bilateral network conversion equipment receives a kind of two-way services content information at least, and the two-way services content information that receives is carried out conversion process, and the two-way services content information after the conversion is sent.Simultaneously this disclosure of the invention at the separate two-way network providing two-way business content information, the different two-way services content information that receives is carried out respectively conversion process; The two-way services receiving and processing equipment can receive and process various two-way services content informations, can deal with respectively for different business.
Existing other business are similar to the VOD business, service server needs the transmission of data of choice for use cable TV network voluntarily or IP network when using IP and cable TV network, when using the cable television network the transmission of data, audio-video frequency content need to be encapsulated as the MPEG-TS transport stream, develop by this way and the professional difficulty of the two-way interactive that provides is large, network adaptability is poor, transplantability is poor; In addition, existing patent " 200610035447.8 " lays particular emphasis on transmission, and specific IP network switch is adopted in the separation of its downlink data, and on network design, IP network switch and IP/DVB gateway need to be in same subnets; Patent " 200710001262.X " lays particular emphasis on the content conversion process, and its bilateral network conversion equipment is specific routing device, must be deployed in the access network section of set-top box.
Summary of the invention
The object of the invention is to, in order to make service server not need special MPEG-TS transport stream that audio-video frequency content is encapsulated as, better realize data communication in the environment of fusion IP network and cable TV network, fully rationally utilize the bandwidth resources of IP network and cable TV network.
For achieving the above object, the present invention proposes a kind of broadband data communication system that merges IP network and cable TV network, this system comprises: IP network, IP/DVB gateway, cable TV network and terminal;
Described IP/DVB gateway be used for to be responsible for receiving the MPEG-TS transport stream from described IP network, the MPEG-TS transport stream is converted to baseband signal, and is modulated on the frequency, and the RF transmitter by described IP/DVB gateway sends to described cable TV network;
Described terminal, employing can receive the equipment that the DVB data broadcast can access again IP network from cable TV network;
Described terminal is connected with described IP/DVB gateway by cable TV network;
It is characterized in that,
This system also comprises fusion passage gateway;
Described terminal and described fusion passage gateway are set up end to end duplex channel in described IP network, and are respectively the end equipment of this duplex channel;
Described IP/DVB gateway and described cable TV network consist of described fusion passage gateway to the one-way communication passage of described terminal;
Described terminal sends to described fusion passage gateway with up IP bag by the IP network bi-directional communication channels, and described fusion passage gateway gets access to up IP bag from described IP network, check then whether address mapping table exists map record; If map record does not exist, then to distribute first one and not use port as mapped port, and in address mapping table, preserve the address map record; Then up IP bag is carried out address transition, replace source address and source port in the original up IP bag with the address of merging the passage gateway and mapped port, the up IP after then will change wraps and sends to IP network; If map record exists, then described fusion passage gateway directly carries out address transition to up IP bag, replace source address and source port in the up IP bag with the address of merging the passage gateway and mapped port, then, the up IP bag after the conversion is sent to described IP network; Described fusion passage gateway receives the downstream IP bag of response from described IP network, the inquire address mapping table obtains IP address and the port of terminal, the downstream IP bag that receives is carried out address transition, with the up IP bag source address of terminal transmission and destination address and the destination interface of source port replacement downstream IP bag; The downstream IP bag that described fusion passage gateway will be changed consists of the described terminal that fusion passage gateway arrives the one-way communication passage of terminal or sends by bi-directional communication channels and one-way communication passage simultaneously by the IP network duplex channel or through described IP/DVB gateway and cable TV network.
Described terminal and described fusion passage gateway are in the different IP subnet.
Described IP network/cable TV network adopts the physical circuit that separates, and comprising: the IP network of ADSL access way and cable TV network.
Described IP network/cable TV network adopts and merges to the Same Physical circuit by frequency division multiplexing, comprising: based on the CMTS of Docsis technology and the IP bilateral network of CM realization.
Described RF transmitter back serial connection QAM modulator, the RF transmitter sends signal to described QAM modulator, and described QAM modulator sends to described cable TV network after with signal and other signal multiplexings; Wherein, other signals comprise: anolog TV signals, digital television signal.
Described bi-directional communication channels adopts IP tunnel or VPN (virtual private network).
Described terminal adopts the bimodule digital STB terminal.
A kind of broadband data communication method that merges IP network and cable TV network, the method concrete steps:
Step 1) behind the described starting terminal, set up end to end bi-directional communication channels with described fusion passage gateway by described IP network, described terminal is obtained frequency, symbol rate, modulation system, transport stream PID, program number parameter simultaneously;
Step 2): described terminal sends to described fusion passage gateway with up IP bag by described bi-directional communication channels;
Step 3): described fusion passage gateway gets access to up IP bag from described IP network, check then whether address mapping table exists map record; If map record does not exist, then to distribute first one and not use port as mapped port, and in address mapping table, preserve the address map record; Then up IP bag is carried out address transition, replace source address and source port in the original up IP bag with the address of merging the passage gateway and mapped port, the up IP after then will change wraps and sends to IP network; If map record exists, then described fusion passage gateway carries out address transition to up IP bag, replaces source address and source port in the up IP bag with the address of merging the passage gateway and mapped port, then, the up IP bag after the conversion is sent to IP network;
Step 4): described fusion passage gateway receives the downstream IP bag of response from described IP network, the inquire address mapping table obtains IP address and the port of terminal, the downstream IP bag that receives is carried out address transition, with the up IP bag source address of terminal transmission and destination address and the destination interface of source port replacement downstream IP bag;
Step 5): the described fusion passage gateway that the downstream IP bag that described fusion passage gateway will be changed consists of by bi-directional communication channels or through described IP/DVB gateway and cable TV network is to the one-way communication passage of described terminal or the described terminal that sends by bi-directional communication channels and one-way communication passage simultaneously.
Described step 1) in, the mode that terminal is obtained frequency, symbol rate, modulation system, transport stream PID, program number parameter is to send by described IP network by the configuration file acquisition or by merging the passage gateway.
Described step 5) in, the downstream IP bag that described fusion passage gateway will be changed encapsulates according to the DVB data broadcast standard, form the MPEG-TS bag, again M MPEG-TS bag is encapsulated as the UDP bag, the UDP bag is sent to described IP/DVB gateway through described IP network, described IP/DVB gateway is converted to baseband signal with transport stream, and be modulated on the frequency of distribution, RF transmitter by described IP/DVB gateway sends to described cable TV network, described terminal receives signal by demodulator, decapsulation, thus the downstream IP bag obtained; Wherein, M ∈ [1,7].
The invention has the advantages that, the present invention has fully rationally utilized the network bandwidth resources of two-way IP network and cable TV network, can realize in two-way IP network and wired TV one-way radio network and the environment of depositing that asymmetrical band data communicates by letter; Because terminal and fusion passage gateway are respectively the end equipment of IP network bi-directional communication channels, merging the passage gateway can dispose flexibly, and the work that audio-video frequency content is encapsulated as the MPEG-TS transport stream is finished by merging the passage gateway, has reduced exploitation and provides two-way interactive professional difficulty.
Description of drawings
Fig. 1 is VOD operation system structure chart in IP network and cable TV network and the dis environment;
Fig. 2 is the fusion IP network that proposes of the present invention and the broadband data communication system construction drawing of cable TV network;
Fig. 3 is the system construction drawing of the terminal access website that proposes of the present invention;
Fig. 4 is that terminal that the present invention proposes sends to the up IP that merges the passage gateway and seals the dress format chart;
Fig. 5 is address mapping table;
Fig. 6 is that the up IP that fusion passage gateway that the present invention proposes sends to the website seals the dress format chart;
Fig. 7 is that website that the present invention proposes sends to the downstream IP that merges the passage gateway and seals the dress format chart;
Fig. 8 is that the fusion passage gateway that the present invention proposes is sealed the dress format chart by the downstream IP that bi-directional communication channels sends to terminal.
Embodiment
Below in conjunction with drawings and Examples the present invention is further specified.
The invention provides the broadband data communication system and method that merges IP network and cable TV network.
The fusion IP network that the present invention proposes and the broadband data communication system construction drawing of cable TV network, as shown in Figure 2, described system comprises that IP network, IP/DVB gateway, cable TV network, fusion passage gateway and terminal form.
Terminal is set up end to end bi-directional communication channels with merging the passage gateway in IP network, and is respectively the end equipment of this bi-directional communication channels.IP/DVB gateway and cable TV network consist of fusion passage gateway to the one-way communication passage of terminal.
IP network can be the physical circuit that separates with cable TV network, for example the IP network of ADSL access way and cable TV network; Also can be by frequency division multiplexing and merge to the Same Physical circuit, for example based on the CMTS of Docsis technology and the IP bilateral network of CM realization.
The IP/DVB gateway is responsible for receiving from IP network and is received the MPEG-TS transport stream, transport stream is converted to baseband signal, and is modulated on the frequency, and the RF transmitter by described IP/DVB gateway sends to cable TV network.
Can be connected in series the QAM modulator in the RF of IP/DVB gateway transmitter back, the RF transmitter of IP/DVB gateway sends signal to the QAM modulator, and the QAM modulator sends to cable TV network with the signal after multiplexing after with signal and other signal multiplexings.
Employing can receive the equipment that the DVB data broadcast can access again IP network from cable TV network.For example the bimodule digital STB terminal can receive the DVB data broadcast, also has the RJ45 interface to realize the IP access by the twisted pair line connection ADSL Modem.
Merge the passage gateway from the up IP bag of IP network receiving terminal, carry out address transition, the up IP bag after the conversion is sent to IP network; Receive the downstream IP bag of response from IP network, carry out address transition, the described fusion passage gateway that the downstream IP bag that last described fusion passage gateway will be changed consists of by bi-directional communication channels or through described IP/DVB gateway and cable TV network is to the one-way communication passage of described terminal or the described terminal that sends by bi-directional communication channels and one-way communication passage simultaneously
Bi-directional communication channels adopts IP tunnel or VPN (virtual private network).
The system construction drawing of the terminal access website that the present invention proposes, as shown in Figure 3.Described system is comprised of website, fusion passage gateway, IP network, IP/DVB gateway, cable TV network, terminal.
Parameter arranges as follows:
(1) described website provides service based on the HTTP application protocol, and the IP address is 211.147.6.148, and listening port is 80;
(2) described fusion passage gateway ip address is 210.75.225.233;
(3) described IP/DVB gateway ip address is 159.226.219.5;
(4) described terminal is dial-up connection to described IP network by ADSL, and its IP address is 10.0.0.100;
(5) website, fusion passage gateway, IP/DVB gateway are connected with IP network; The IP/DVB gateway connects cable TV network;
(6) terminal connects IP network and cable TV network simultaneously.
Behind the starting terminal, set up IP tunnel with described fusion passage gateway, obtain simultaneously the parameters such as frequency, symbol rate, modulation system, transport stream PID, program number.Wherein, terminal exists various ways to obtain above-mentioned parameter, for example can obtain by configuration file, can send to terminal etc. by IP tunnel by merging the passage gateway.
The step of described terminal access website is as follows:
(1) terminal sends to original up IP bag and merges the passage gateway by IP tunnel.
The terminal that the present invention proposes sends to the up IP that merges the passage gateway and seals the dress format chart, shown in 4.The source address of the up IP bag of internal layer is 10.0.0.100, and source port is 2799, and destination address is 211.147.6.148, and destination interface is 80.
(2) after fusion passage gateway receives up IP bag, obtain the up IP bag of internal layer, whether lower inspection address mapping table exists map record, if there is no, then distribute one not use port as mapped port, in address mapping table, preserve the address map record, then the up IP bag of internal layer is carried out address transition, replace source address and source port in the original up IP bag with the address of merging the passage gateway and mapped port, the up IP after then will change wraps and sends to IP network.
Address mapping table, as shown in Figure 5.Wherein, mapped port is 13478, and the up IP after the conversion seals the dress form as shown in Figure 6, and the source address of up IP bag is 210.75.225.233 after the conversion, and source port is 13478, and destination address is 211.147.6.148, and destination interface is 80.
(3) the up IP bag after IP network will be changed is routed to the website, and the website receives the IP bag that merges the passage gateway, and the downstream IP bag that responds is sent to IP network.
The website that the present invention proposes sends to the downstream IP that merges the passage gateway and seals the dress format chart, and as shown in Figure 7, the source address of downstream IP bag is 211.147.6.148, and source port is 80, and destination address is 210.75.225.233, and destination interface is 13478.
(4) IP network is routed to the downstream IP bag and merges the passage gateway, merge the downstream IP bag that the passage gateway receives response, the inquire address mapping table obtains IP address and the port of terminal, the downstream IP bag that receives is carried out address transition, replace destination address and the destination interface of downstream IP bag with the up IP bag source address of the internal layer of terminal transmission and source port.
The source address of the IP bag after the conversion is 211.147.6.148, and source port is 80, and destination address is 10.0.0.100, and destination interface is 2799.
(5) merge downstream IP bag that the passage gateway will change by IP tunnel or have the one-way communication passage to send to terminal, or send to terminal by IP tunnel and one-way communication passage simultaneously.
The fusion passage gateway that the present invention proposes is sealed the dress format chart by the downstream IP that bi-directional communication channels sends to terminal, as shown in Figure 8.The source address of the downstream IP bag after the internal layer conversion is 211.147.6.148, and source port is 80, and destination address is 10.0.0.100, and destination interface is 2799.
The downstream IP bag that fusion passage gateway will be changed is encapsulated as the MPE multi-protocol encapsulation according to the DVB data broadcast standard, and the MPE multi-protocol encapsulation is formed the MPEG-TS bag, again M MPEG-TS bag is encapsulated as the UDP bag, the UDP bag is sent to the IP/DVB gateway by IP network, the IP/DVB gateway is converted to baseband signal with transport stream, and be modulated on the frequency of distribution, RF transmitter by described IP/DVB gateway sends to cable TV network, terminal receives signal by demodulator, decapsulation, thus the downstream IP bag obtained.Wherein, M ∈ [1,7].
A kind of system and method that merges IP network bi-directional communication channels and cable TV network one-way communication passage realization broadband data communication of the present invention, in the above-described embodiments, introduce as an example of the terminal access website example, identical with processing method and the principle of other bidirectional data communications, do not repeat here to introduce; Among the embodiment with IP tunnel as bi-directional communication channels, the bi-directional communication channels that other technologies realize all belongs to protection range of the present invention; Terminal is take the ADSL access way as example among the embodiment, and other just no longer make introductions all round here as long as logically be that IP network and cable TV network all belong to protection scope of the present invention.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although with reference to embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. broadband data communication system that merges IP network and cable TV network, this system comprises: IP network, IP/DVB gateway, cable TV network and terminal;
Described IP/DVB gateway be used for to be responsible for receiving the MPEG-TS transport stream from described IP network, the MPEG-TS transport stream is converted to baseband signal, and is modulated on the frequency, and the RF transmitter by described IP/DVB gateway sends to described cable TV network;
Described terminal, employing can receive the equipment that the DVB data broadcast can access again IP network from cable TV network;
Described IP/DVB gateway is connected with described terminal by cable TV network;
It is characterized in that,
This system also comprises fusion passage gateway;
Described terminal and described fusion passage gateway are set up end to end bi-directional communication channels in described IP network, and are respectively the end equipment of this bi-directional communication channels;
Described IP/DVB gateway and described cable TV network consist of described fusion passage gateway to the one-way communication passage of described terminal;
Described terminal sends to described fusion passage gateway with up IP bag by the IP network bi-directional communication channels, and described fusion passage gateway gets access to up IP bag from described IP network, check then whether address mapping table exists map record; If map record does not exist, then to distribute first one and not use port as mapped port, and in address mapping table, preserve the address map record; Then up IP bag is carried out address transition, replace source address and source port in the original up IP bag with the address of merging the passage gateway and mapped port, the up IP after then will change wraps and sends to IP network; If map record exists, then described fusion passage gateway directly carries out address transition to up IP bag; Described fusion passage gateway receives the downstream IP bag of response from described IP network, the inquire address mapping table obtains IP address and the port of terminal, the downstream IP bag that receives is carried out address transition, with the up IP bag source address of terminal transmission and destination address and the destination interface of source port replacement downstream IP bag; The downstream IP bag that described fusion passage gateway will be changed consists of fusion passage gateway to the one-way communication passage of terminal or sends to described terminal by bi-directional communication channels and one-way communication passage simultaneously by the IP network bi-directional communication channels or through described IP/DVB gateway and cable TV network.
2. the broadband data communication system of fusion IP network according to claim 1 and cable TV network is characterized in that, described terminal and described fusion passage gateway are in the not same IP subnet.
3. the broadband data communication system of fusion IP network according to claim 1 and cable TV network is characterized in that, described IP network/cable TV network adopts the physical circuit that separates, and comprising: the IP network of ADSL access way and cable TV network.
4. the broadband data communication system of fusion IP network according to claim 1 and cable TV network, it is characterized in that, described IP network/cable TV network adopts and merges to the Same Physical circuit by frequency division multiplexing, comprising: based on the CMTS of Docsis technology and the IP bilateral network of CM realization.
5. the broadband data communication system of fusion IP network according to claim 1 and cable TV network, it is characterized in that, described RF transmitter back serial connection QAM modulator, the RF transmitter sends signal to described QAM modulator, and described QAM modulator sends to described cable TV network after with signal and other signal multiplexings; Wherein, other signals comprise: anolog TV signals, digital television signal.
6. the broadband data communication system of fusion IP network according to claim 1 and cable TV network is characterized in that, described bi-directional communication channels adopts IP tunnel or VPN (virtual private network).
7. the broadband data communication system of fusion IP network according to claim 1 and cable TV network is characterized in that, described terminal adopts the bimodule digital STB terminal.
8. communication means of realizing the broadband data communication system of fusion IP network as claimed in claim 1 and cable TV network, the method concrete steps:
Behind the described starting terminal of step 1), set up end to end bi-directional communication channels with described fusion passage gateway by described IP network, described terminal is obtained frequency, symbol rate, modulation system, transport stream PID, program number parameter simultaneously;
Step 2): described terminal sends to described fusion passage gateway with up IP bag by described bi-directional communication channels;
Step 3): described fusion passage gateway gets access to up IP bag from described IP network, check then whether address mapping table exists map record; If map record does not exist, then to distribute first one and not use port as mapped port, and in address mapping table, preserve the address map record; Then up IP bag is carried out address transition, replace source address and source port in the original up IP bag with the address of merging the passage gateway and mapped port, the up IP after then will change wraps and sends to IP network; If map record exists, then described fusion passage gateway carries out address transition to up IP bag, replaces source address and source port in the up IP bag with the address of merging the passage gateway and mapped port, then, the up IP bag after the conversion is sent to IP network;
Step 4): described fusion passage gateway receives the downstream IP bag of response from described IP network, the inquire address mapping table obtains IP address and the port of terminal, the downstream IP bag that receives is carried out address transition, with the up IP bag source address of terminal transmission and destination address and the destination interface of source port replacement downstream IP bag;
Step 5): the described fusion passage gateway that the downstream IP bag that described fusion passage gateway will be changed consists of by bi-directional communication channels or through described IP/DVB gateway and cable TV network is to the one-way communication passage of described terminal or send to described terminal by bi-directional communication channels and one-way communication passage simultaneously.
9. the broadband data communication method of fusion IP network according to claim 8 and cable TV network, it is characterized in that, in the described step 1), the mode that terminal is obtained frequency, symbol rate, modulation system, transport stream PID, program number parameter is to send by described IP network by the configuration file acquisition or by merging the passage gateway.
10. the broadband data communication method of fusion IP network according to claim 8 and cable TV network, it is characterized in that, in the described step 5), the downstream IP bag that described fusion passage gateway will be changed encapsulates according to the DVB data broadcast standard, form the MPEG-TS bag, again M MPEG-TS bag is encapsulated as the UDP bag, the UDP bag is sent to described IP/DVB gateway through described IP network, described IP/DVB gateway is converted to baseband signal with transport stream, and be modulated on the frequency of distribution, RF transmitter by described IP/DVB gateway sends to described cable TV network, described terminal receives signal by demodulator, decapsulation, thus the downstream IP bag obtained; Wherein, M ∈ [1,7].
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| CN102006503A (en) | 2011-04-06 |
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